U.S. patent application number 16/621703 was filed with the patent office on 2020-07-02 for method for controlling particle size of dry centrifugal granulated slag particles from liquid slag.
The applicant listed for this patent is XI'AN JIAOTONG UNIVERSITY. Invention is credited to Liwei Ma, Haiyu Meng, Shuzhong Wang, Zhiqiang Wu, Xi Zhang, Jun Zhao.
Application Number | 20200208230 16/621703 |
Document ID | / |
Family ID | 62929902 |
Filed Date | 2020-07-02 |
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United States Patent
Application |
20200208230 |
Kind Code |
A1 |
Wang; Shuzhong ; et
al. |
July 2, 2020 |
Method for controlling particle size of dry centrifugal granulated
slag particles from liquid slag
Abstract
A method for controlling a particle size of dry centrifugal
granulated slag from liquid slag, which is based on a dry
centrifugal granulation system for liquid slag, wherein the dry
centrifugal granulation system for the liquid slag includes: a
temperature control unit, a flow control unit, and a granulator
control unit; wherein the temperature control unit is configured to
control a high-temperature slag in the liquid slag buffer device to
maintain a first set temperature range, and control a temperature
of an outflow slag of the buffer device to maintain a second set
temperature range; a flow control unit configured to control a flow
rate of the high-temperature slag flowing out of the buffer device
in a set range to ensure smoothness of the flow; a granulator
control unit configured to ensure a smooth operation of the
granulator during high-speed rotation.
Inventors: |
Wang; Shuzhong; (Xi'an,
Shaanxi, CN) ; Zhang; Xi; (Xi'an, Shaanxi, CN)
; Zhao; Jun; (Xi'an, Shaanxi, CN) ; Ma; Liwei;
(Xi'an, Shaanxi, CN) ; Wu; Zhiqiang; (Xi'an,
Shaanxi, CN) ; Meng; Haiyu; (Xi'an, Shaanxi,
CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
XI'AN JIAOTONG UNIVERSITY |
Xi'an, Shaanxi |
|
CN |
|
|
Family ID: |
62929902 |
Appl. No.: |
16/621703 |
Filed: |
July 20, 2018 |
PCT Filed: |
July 20, 2018 |
PCT NO: |
PCT/CN2018/096520 |
371 Date: |
December 12, 2019 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
C21B 2400/026 20180801;
C21B 3/06 20130101; C21B 2400/054 20180801; C21B 3/08 20130101;
Y02W 30/543 20150501 |
International
Class: |
C21B 3/08 20060101
C21B003/08 |
Foreign Application Data
Date |
Code |
Application Number |
Feb 26, 2018 |
CN |
201810159868.4 |
Claims
1. A method for controlling a particle size of dry centrifugal
granulated slag from liquid slag, which is based on a dry
centrifugal granulation system for liquid slag, wherein the dry
centrifugal granulation system for the liquid slag comprises: a
temperature control unit, a flow control unit, and a granulator
control unit; wherein the temperature control unit is configured to
control a high-temperature slag in the liquid slag buffer device to
maintain a first set temperature range, and control a temperature
of an outflow slag of the buffer device to maintain a second set
temperature range; a flow control unit configured to control a flow
rate of the high-temperature slag flowing out of the buffer device
in a set range to ensure smoothness of the flow; a granulator
control unit configured to control centering of a center of the
granulator and a center of a slag tube of the buffer device, and
meanwhile ensuring a smooth operation of the granulator during
high-speed rotation; the method for controlling a particle size of
dry centrifugal granulated slag from liquid slag specifically
comprises steps of: step (1) through the temperature control unit,
the flow control unit and the granulator control unit, controlling
a temperature and a flow rate of a liquid slag falling into the
granulator, and ensuring that the granulator and the slag tube are
centered and smooth without shaking; then commissioning; through a
process test, adjusting a rotation speed of the granulator, an
outflow flow rate, a viscosity temperature characteristic, a
granulator structure, a granulator size, a granulator surface
roughness, a granulator edge wind speed and angle, so as to obtain
relationships between a particle size of the granulated slag and
the rotation speed of the granulator, the outflow flow rate, the
viscosity temperature characteristic, the granulator structure, the
granulator size, the granulator surface roughness, and the
granulator edge wind speed and angle; starting a normal granulation
process after the relationships between the particle size of
granulated slag and the rotation speed of the granulator, the
outflow flow rate, the viscosity temperature characteristic, the
granulator structure, the granulator size, the granulator surface
roughness, and the granulator edge wind speed and angle are
obtained; if the particle size of the granulated slag obtained
according to the relationship of the particle size is larger than a
set interval during the normal granulation process, increasing a
granule speed of the granulator to return to the set interval; if
the particle size of the granulated slag is smaller than the set
interval, decreasing the granule speed of the granulator to return
to the set interval.
2. The method for controlling a particle size of dry centrifugal
granulated slag from liquid slag, as recited in claim 1, wherein a
temperature control means of the temperature control unit
comprises: providing a temperature control program on the cache
device, providing a heat supplement solution on the cache device,
providing the temperature control program on the cache device and
adding a heat supplement solution.
3. The method for controlling a particle size of dry centrifugal
granulated slag from liquid slag, as recited in claim 1, wherein if
the viscosity-temperature characteristics of the slag known are not
capable of meeting the requirements for controlling the particle
size of the granulated slag, the particle size is controlled by
adjusting the alkalinity of the slag to adjust the
viscosity-temperature characteristics of the slag.
4. The method for controlling a particle size of dry centrifugal
granulated slag from liquid slag, as recited in claim 1, wherein
the dry centrifugal granulation system for the liquid slag
comprises: a granulator (219), a granulator fixing device (232) and
a granulator driving device; wherein the granulator is fixed on the
granulator fixing device (232); and the granulator fixing device is
provided with an air flow channel (233), the granulator fixture
contacts a bottom of the granulator to provide an expanded heat
receiving surface (234); the top of the granulator fixture has a
plurality of first tuyeres (236), and the outlet angle of the top
first tuyere and the edge of the granulator The dip angle
intersects to externally crush the liquid film or liquid filament
formed during the granulation process; the granulator fixing device
(232) has a plurality of second tuyeres (235) on the side, and the
second tuyere and the edge of the granulator are inclined The
angles are parallel or intersected for cooling droplets formed by
liquid filament breakage during granulation; the first tuyere and
the second tuyere are in communication with the gas flow passage
(233); the granulator drive is used to drive the granulator to
rotate.
5. The method for controlling a particle size of dry centrifugal
granulated slag from liquid slag, as recited in claim 4, wherein
the liquid slag dry centrifugal granulation system further includes
a granulator drive device and a shaft cooling air passage; wherein
the granulator driving device comprises a motor (209) and a
rotating shaft (223); the output shaft of the motor (209) is
fixedly connected with the lower end of the rotating shaft (223);
the upper end of the rotating shaft is fixedly connected with the
bottom of the granulator fixing device (232); a plurality of
temperature resistant blades (224) are disposed on the rotating
shaft; the shaft cooling air duct comprises a motor sealing cover
(210), an inner tube sleeve (217), a shaft sleeve (222) and a
rotating shaft (223); the sealing cover (210) surrounds the outer
circumference of the motor (209), and the inner tube of the air
duct (217) and the shaft sleeve (222) is sleeved on the outer
circumference of the rotating shaft (223); the inner ring of the
temperature resistant thrust bearing (212) and the temperature
resistant positioning bearing (221) are fixed on the rotating shaft
(223), and the outer ring is fixed at the inner wall of the inner
sleeve (217); the shaft sleeve (222) is fixed between the outer
ring of the temperature-resistant bearing at the top thereof and
the outer ring of the temperature-resistant bearing at the lower
portion thereof, and the temperature-resistant blade (224) is
surrounded therein; Both the temperature thrust bearing (212) and
the temperature resistant positioning bearing (221) are provided
with an air flow passage (218); the sealing cover (210) is fixedly
connected with the inner tube sleeve (217) and communicated through
the vent (226); an outer sleeve (216) is arranged on the outer
circumference of the inner sleeve (217) of the air duct, and an
annular cooling air duct is formed between the inner sleeve (217)
of the air duct and the outer sleeve (216) of the air duct, and the
annular cooling duct is arranged at the top of the annular shape;
there are a number of hoods (220); the bottom of the outer sleeve
of the duct is provided with an annular cooling duct air inlet
(225).
6. The method for controlling a particle size of dry centrifugal
granulated slag from liquid slag, as recited in claim 4, wherein
the shaft cooling air enters from the sealing hood tuy, and after
cooling the rotating shaft inside the shaft sleeve, most of the air
flow passages entering the granulator fixing device, and a
plurality of first air outlets uniformly distributed from the top
and the side wall of the granulator fixing device And the second
tuyere enters the granulation chamber, and a small portion enters
the granulation chamber from a narrow gap between the granulator
fixture and the inner sleeve of the duct.
7. The method for controlling a particle size of dry centrifugal
granulated slag from liquid slag, as recited in claim 4, wherein
the air outlet of the hood is lower than the air outlet of the
first air outlet and the second air outlet
8. The method for controlling a particle size of dry centrifugal
granulated slag from liquid slag, as recited in claim 4, wherein
the bottom of the rotating shaft (223) is provided with a
temperature-resistant thrust bearing (212), and one or more
temperature-resistant positioning bearings (221) are arranged in
the middle and the upper part of the rotating shaft, wherein the
uppermost positioning bearing should be as close as possible to the
bottom of the granulator fixing device.
9. The method for controlling a particle size of dry centrifugal
granulated slag from liquid slag, as recited in claim 4, wherein
there are three ways to generate shaft cooling air: (1) in the
first mode, the cooling air is generated by the fan, entering from
the sealing hood tuyere (227), and most of the airflow passage
(233) passing through the granulator fixing device flows out, and a
small portion is between the fixing device and the inner tube
sleeve (217). a small gap flows out; (2) in the second mode, the
temperature-resistant blade (224) on the rotating shaft (223)
generates cooling air according to the high-speed rotation of the
rotating shaft, and most of the airflow passage (233) flows out
through the granulator fixing device (232), and a small portion is
fixed from the fixing device. a narrow gap between the inner sleeve
(217) of the air duct; (3) in the third mode, the fan air outlet
and the high temperature rotating blade of the temperature
resistant blade cooperate as the shaft cooling wind to cool the
shaft cooling air duct and the rotating shaft.
Description
CROSS REFERENCE OF RELATED APPLICATION
[0001] This is a U.S. National Stage under 35 U.S.C 371 of the
International Application PCT/CN2018/096520, filed Jul. 20, 2018,
which claims priority under 35 U.S.C. 119(a-d) to CN
201810159868.4, filed Feb. 26, 2018.
BACKGROUND OF THE PRESENT INVENTION
Field of Invention
[0002] The present invention relates to the technical field of
high-temperature liquid slag waste heat recovery, and more
particular to a method for controlling particle size of dry
centrifugal granulated slag particle from liquid slag.
Description of Related Arts
[0003] China is currently the largest steel producer all over the
world. In 2016, China's pig iron yield was about 0.701 billion
tons, accounting for about 60% of the world's total production. In
the process of smelting pig iron, blast furnace slag containing
huge heat was produced. The blast furnace slag is generally
discharged at a temperature at a range of 1400-1550.degree. C. Each
ton of the slag contains (1260 to 1880).times.10.sup.3 kJ of
sensible heat, equivalent to 60 kg of standard coal. Under the
conventional iron making technology in China, while producing one
ton of pig iron, 0.3 tons by product of blast furnace slag are
produced, calculated by the current production of 0.701 billion
tons, which can be converted into blast furnace slag of more than
210 million tons, and the sensible heat thereof is equivalent to
about 12.618 million tons of standard coal.
[0004] The dry slag pit cooling method and the water flush slag
method are the most common method for treating blast furnace slag
in China. The dry slag pit cooling method generates a large amount
of water vapor while cooling, and at the same time releases a large
amount of H.sub.2S gas and SO.sub.2 gas, which corrodes the
building, destroying the equipment and deteriorating the working
environment. The water slag method wastes a lot of water resources
during the treatment process, generates harmful gases such as
SO.sub.2 and H.sub.2S, and cannot effectively recover high-quality
waste heat resources contained in the high-temperature liquid slag.
At present, these treatment methods are not capable of meeting the
urgent requirements of energy saving and emission reduction in the
current steel industry, and the dry centrifugal granulation method
is widely favored due to low system energy consumption, small and
uniform particle size, and high added value of products.
[0005] In the dry centrifugal granulation process, the liquid slag
drops onto the surface of the high-speed rotating granulator, and
is scooped out under the action of centrifugal force and friction
force to form small droplets under the action of surface tension.
These tiny liquids The droplets are forced to convective heat
transfer with a heat transfer medium (generally air) in the space,
and perform radiative heat exchange with the surrounding
environment causes the temperature of the small droplets to
decrease, and then a phase change occurs to form a solidified
layer. As the temperature is further reduced, the droplets
gradually transform into solid small particles. However, if the
particle size of the granulated slag is too large, the cooling rate
of the molten slag particles decreases during the heat exchange
with the heat transfer medium in the space, and the crystal phase
transition is easy, resulting in a decrease in the glass transition
rate and affecting the high-efficiency resource utilization of the
slag particles; if the particle size of the granulated slag
particles is too small, the flight distance is too long, and it is
easy to hit the granulated warehouse wall surface in the molten
state or the external condensed molten state to adhere thereto, and
Easy to bond into large pieces. If the high-temperature slag
particles are bonded to the wall surface and bonded into a large
block, on the one hand, it is easy to cause over-temperature and
corrosion of the granulated warehouse wall surface, and the large
block that is bonded after cooling is not easy to clean, which
brings the pole for maintenance work. On the other hand, the slag
particles bonded into a large block are slowly cooled in the
granulated space and have sufficient time to crystallize, thereby
reducing the glass transition rate and affecting its efficient
resource utilization. Therefore, in order to ensure the normal
progress of dry centrifugal granulation, it is urgent to provide a
liquid slag dry centrifugal granulated slag particle size control
method.
SUMMARY OF THE PRESENT INVENTION
[0006] An object of the present invention is to provide a liquid
slag dry centrifugal granulated slag particle size control method
to solve the above technical problem; the control method of the
invention can effectively prevent the granulated slag particles
from being excessively caused to cause a decrease in the vitreous
conversion rate thereof. When the slag particles are too small, the
granulated slag particles have a low wall and glass transition
rate.
[0007] In order to achieve the above object, a technical solution
adopted by the present invention is as follows.
[0008] A method for controlling a particle size of dry centrifugal
granulated slag from liquid slag is provided, which is based on a
dry centrifugal granulation system for liquid slag, wherein the dry
centrifugal granulation system for the liquid slag comprises: a
temperature control unit, a flow control unit, and a granulator
control unit;
[0009] wherein the temperature control unit is configured to
control a high-temperature slag in the liquid slag buffer device to
maintain a first set temperature range, and control a temperature
of an outflow slag of the buffer device to maintain a second set
temperature range;
[0010] a flow control unit configured to control a flow rate of the
high-temperature slag flowing out of the buffer device in a set
range to ensure smoothness of the flow;
[0011] a granulator control unit configured to control centering of
a center of the granulator and a center of a slag tube of the
buffer device, and meanwhile ensuring a smooth operation of the
granulator during high-speed rotation;
[0012] the method for controlling a particle size of dry
centrifugal granulated slag from liquid slag specifically comprises
steps of:
[0013] step (1) through the temperature control unit, the flow
control unit and the granulator control unit, controlling a
temperature and a flow rate of a liquid slag falling into the
granulator, and ensuring that the granulator and the slag tube are
centered and smooth without shaking; then commissioning; through a
process test, adjusting a rotation speed of the granulator, an
outflow flow rate, a viscosity temperature characteristic, a
granulator structure, a granulator size, a granulator surface
roughness, a granulator edge wind speed and angle, so as to obtain
relationships between a particle size of the granulated slag and
the rotation speed of the granulator, the outflow flow rate, the
viscosity temperature characteristic, the granulator structure, the
granulator size, the granulator surface roughness, and the
granulator edge wind speed and angle;
[0014] starting a normal granulation process after the
relationships between the particle size of granulated slag and the
rotation speed of the granulator, the outflow flow rate, the
viscosity temperature characteristic, the granulator structure, the
granulator size, the granulator surface roughness, and the
granulator edge wind speed and angle are obtained;
[0015] if the particle size of the granulated slag obtained
according to the relationship of the particle size is larger than a
set interval during the normal granulation process, increasing a
granule speed of the granulator to return to the set interval; if
the particle size of the granulated slag is smaller than the set
interval, decreasing the granule speed of the granulator to return
to the set interval.
[0016] Preferably, a temperature control means of the temperature
control unit comprises: providing a temperature control program on
the cache device, providing a heat supplement solution on the cache
device, providing the temperature control program on the cache
device and adding a heat supplement solution.
[0017] Preferably, if the viscosity-temperature characteristics of
the slag known are not capable of meeting the requirements for
controlling the particle size of the granulated slag, the particle
size is controlled by adjusting the alkalinity of the slag to
adjust the viscosity-temperature characteristics of the slag.
[0018] Preferably, the dry centrifugal granulation system for the
liquid slag comprises: a granulator (219), a granulator fixing
device (232) and a granulator driving device; wherein the
granulator is fixed on the granulator fixing device (232); and the
granulator fixing device is provided with an air flow channel
(233), the granulator fixture contacts a bottom of the granulator
to provide an expanded heat receiving surface (234); the top of the
granulator fixture has a plurality of first tuyeres (236), and the
outlet angle of the top first tuyere and the edge of the granulator
The dip angle intersects to externally crush the liquid film or
liquid filament formed during the granulation process; the
granulator fixing device (232) has a plurality of second tuyeres
(235) on the side, and the second tuyere and the edge of the
granulator are inclined The angles are parallel or intersected for
cooling droplets formed by liquid filament breakage during
granulation; the first tuyere and the second tuyere are in
communication with the gas flow passage (233); the granulator drive
is used to drive the granulator to rotate.
[0019] Preferably, the liquid slag dry centrifugal granulation
system further includes a granulator drive device and a shaft
cooling air channel;
[0020] wherein the granulator driving device comprises a motor
(209) and a rotating shaft (223); the output shaft of the motor
(209) is fixedly connected with the lower end of the rotating shaft
(223); the upper end of the rotating shaft is fixedly connected
with the bottom of the granulator fixing device (232); a plurality
of temperature resistant blades (224) are disposed on the rotating
shaft;
[0021] the shaft cooling air duct comprises a motor sealing cover
(210), an inner tube sleeve (217), a shaft sleeve (222) and a
rotating shaft (223); the sealing cover (210) surrounds the outer
circumference of the motor (209), and the inner tube of the air
duct (217) and the shaft sleeve (222) is sleeved on the outer
circumference of the rotating shaft (223); the inner ring of the
temperature resistant thrust bearing (212) and the temperature
resistant positioning bearing (221) are fixed on the rotating shaft
(223), and the outer ring is fixed at The inner wall of the inner
sleeve (217); the shaft sleeve (222) is fixed between the outer
ring of the temperature-resistant bearing at the top thereof and
the outer ring of the temperature-resistant bearing at the lower
portion thereof, and the temperature-resistant blade (224) is
surrounded therein; Both the temperature thrust bearing (212) and
the temperature resistant positioning bearing (221) are provided
with an air flow passage (218);
[0022] the sealing cover (210) is fixedly connected with the inner
tube sleeve (217) and communicated through the vent (226);
[0023] an outer sleeve (216) is arranged on the outer circumference
of the inner sleeve (217) of the air duct, and an annular cooling
air duct is formed between the inner sleeve (217) of the air duct
and the outer sleeve (216) of the air duct, and the annular cooling
duct is arranged at the top of the annular shape; there are a
number of hoods (220); the bottom of the outer sleeve of the duct
is provided with an annular cooling duct air inlet (225).
[0024] Preferably, the shaft cooling air enters from the sealing
hood tuy, and after cooling the rotating shaft inside the shaft
sleeve, most of the air flow passages entering the granulator
fixing device, and a plurality of first air outlets uniformly
distributed from the top and the side wall of the granulator fixing
device And the second tuyere enters the granulation chamber, and a
small portion enters the granulation chamber from a narrow gap
between the granulator fixture and the inner sleeve of the
duct.
[0025] Preferably, the air outlet of the hood is lower than the air
outlet of the first air outlet and the second air outlet
[0026] Preferably, the bottom of the rotating shaft (223) is
provided with a temperature-resistant thrust bearing (212), and one
or more temperature-resistant positioning bearings (221) are
arranged in the middle and the upper part of the rotating shaft,
wherein the uppermost positioning bearing should be as close as
possible to the bottom of the granulator fixing device.
[0027] Preferably, there are three ways to generate shaft cooling
air:
[0028] (1) in the first mode, the cooling air is generated by the
fan, entering from the sealing hood tuyere (227), and most of the
airflow passage (233) passing through the granulator fixing device
flows out, and a small portion is between the fixing device and the
inner tube sleeve (217). a small gap flows out;
[0029] (2) in the second mode, the temperature-resistant blade
(224) on the rotating shaft (223) generates cooling air according
to the high-speed rotation of the rotating shaft, and most of the
airflow passage (233) flows out through the granulator fixing
device (232), and a small portion is fixed from the fixing device.
a narrow gap between the inner sleeve (217) of the air duct;
[0030] (3) in the third mode, the fan air outlet and the high
temperature rotating blade of the temperature resistant blade
cooperate as the shaft cooling wind to cool the shaft cooling air
duct and the rotating shaft.
[0031] Compared with the prior art, the present invention has the
following beneficial effects.
[0032] (1) The method for controlling the particle size of the dry
granulated slag from the liquid slag provided by the invention can
effectively control the particle size of the granulated slag,
avoiding the excessive conversion of the granulated slag particles,
thereby reducing the conversion rate of the vitreous body and
avoiding the granulated slag. The small size of the particles
causes the viscous slag particles to adhere to the wall and the
glass body has a low conversion rate, which provides a certain
reference for industrial applications.
[0033] (2) The present invention proposes a structure for ensuring
the air outlet at the edge of the granulator in the particle size
control, wherein the granulator fixing device has a plurality of
tuyeres at the top thereof, and the outlet angle intersects the dip
angle of the granulator edge. The liquid film or liquid filament
formed during the granulation process can be externally broken to
enhance the granulation effect.
[0034] (3) The present invention proposes a liquid slag dry
centrifugal granulation system in particle size control, wherein
the rotating shaft is provided with one-stage, two-stage or
multi-stage small temperature-resistant blades. During the
granulation process, the rotating shaft drives the
temperature-resistant blade to rotate at a high speed. On the one
hand, the flow power of the air duct is generated, the crushing
effect of the granulated edge wind is enhanced, and the cooling of
the shaft cooling device to the shaft and the granulator fixing
device is accelerated. On the other hand, the temperature-resistant
blade can also be used as a rib structure to enhance the overall
heat dissipation of the rotating shaft.
BRIEF DESCRIPTION OF THE DRAWINGS
[0035] Further description of the present invention is illustrated
combining with the accompanying drawings and the preferred
embodiments of the present invention.
[0036] FIG. 1 is a flow chart of a method for controlling a
particle size of a dry granulated slag from liquid slag.
[0037] FIG. 2 is a schematic view of a liquid-slag dry centrifugal
granulation system.
[0038] FIG. 3 is a schematic view of a fixture of a granulator.
[0039] 209--motor; 210--sealing cover; 211--coupling; 216--duct
outer sleeve; 217--duct inner sleeve; 219--granulator; 220--hood;
222--shaft sleeve; 223--rotation shaft; 224--temperature resistant
blade; 225--annular air vent; 226--blow vent; 227--sealing cover
air vent; 232--granulator fixture; 233--airflow runner;
234--expanded heating surface; 235--second air vent; 236--first air
vent.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0040] Referring to FIGS. 1-3, the present invention provides a
method for controlling a particle size of dry centrifugal
granulated slag from liquid slag, which is based on a dry
centrifugal granulation system for liquid slag, wherein the dry
centrifugal granulation system for the liquid slag comprises: a
temperature control unit, a flow control unit, and a granulator
control unit;
[0041] wherein the temperature control unit is configured to
control a high-temperature slag in the liquid slag buffer device to
maintain a first set temperature range, and control a temperature
of an outflow slag of the buffer device to maintain a second set
temperature range;
[0042] a flow control unit configured to control a flow rate of the
high-temperature slag flowing out of the buffer device in a set
range to ensure smoothness of the flow;
[0043] a granulator control unit configured to control centering of
a center of the granulator and a center of a slag tube of the
buffer device, and meanwhile ensuring a smooth operation of the
granulator during high-speed rotation;
[0044] the method for controlling a particle size of dry
centrifugal granulated slag from liquid slag specifically comprises
steps of:
[0045] step (1) through the temperature control unit, the flow
control unit and the granulator control unit, controlling a
temperature and a flow rate of a liquid slag falling into the
granulator, and ensuring that the granulator and the slag tube are
centered and smooth without shaking; then commissioning; through a
process test, adjusting a rotation speed of the granulator, an
outflow flow rate, a viscosity temperature characteristic, a
granulator structure, a granulator size, a granulator surface
roughness, a granulator edge wind speed and angle, so as to obtain
relationships between a particle size of the granulated slag and
the rotation speed of the granulator, the outflow flow rate, the
viscosity temperature characteristic, the granulator structure, the
granulator size, the granulator surface roughness, and the
granulator edge wind speed and angle;
[0046] starting a normal granulation process after the
relationships between the particle size of granulated slag and the
rotation speed of the granulator, the outflow flow rate, the
viscosity temperature characteristic, the granulator structure, the
granulator size, the granulator surface roughness, and the
granulator edge wind speed and angle are obtained;
[0047] if the particle size of the granulated slag obtained
according to the relationship of the particle size is larger than a
set interval during the normal granulation process, increasing a
granule speed of the granulator to return to the set interval; if
the particle size of the granulated slag is smaller than the set
interval, decreasing the granule speed of the granulator to return
to the set interval.
[0048] A temperature control means of the temperature control unit
comprises: providing a temperature control program on the cache
device, providing a heat supplement solution on the cache device,
providing the temperature control program on the cache device and
adding a heat supplement solution.
[0049] If the viscosity-temperature characteristics of the slag
known are not capable of meeting the requirements for controlling
the particle size of the granulated slag, the particle size is
controlled by adjusting the alkalinity of the slag to adjust the
viscosity-temperature characteristics of the slag.
[0050] The liquid slag dry centrifugal granulation system
comprises: a granulator 219, a granulator fixing device 232 and a
granulator driving device; the granulator 219 has a disk shape or a
cup shape, and the edge inclination angle is 30.degree. to
60.degree., the center A flow guiding cone is provided; the
granulator 219 is fixed on the granulator fixing device 232; the
granulator fixing device 232 is internally provided with an air
flow passage 233; and the granulator fixing device 232 is connected
to the bottom of the granulator 219 to provide extended heat. The
surface 234, such as an annular rib, can better cool the granulator
fixture; the granulator fixture 232 has a plurality of first
tuyeres 236 at the top, and the outlet angle of the first tuyere
and the edge of the granulator When intersected, the liquid film or
liquid filament formed during the granulation process can be
externally broken to enhance the granulation effect; the granulator
fixing device 232 is provided with a plurality of second tuyeres
235 on the side, and the second tuyere and the edge of the
granulator are inclined Parallel or cross, the droplets formed by
the liquid filament breakage during granulation can be cooled to
increase the glass transition rate. The first tuyere 236 and the
second tuyere 235 are in communication with the air flow passage
233.
[0051] The granulator driving device includes a motor 209, a
sealing cover 210, a rotating shaft 223, a shaft sleeve 222, an
inner tube sleeve 217, an outer tube sleeve 216, a hood 220, and
the like. The motor 209 and the rotating shaft 223 are coupled by a
coupling 211; the rotating shaft is provided with a plurality of
temperature-resistant blades 224; the bottom of the rotating shaft
223 is provided with a temperature-resistant thrust bearing 212,
and one or more temperature-resistant positioning bearings 221 are
provided at the middle and the upper portion of the rotating shaft.
The uppermost positioning bearing should be as close as possible to
the bottom of the granulator fixing device 232. On the one hand,
the rotating shaft of the high-speed rotating shaft can be improved
due to the inaccurate mechanical structure, thereby affecting the
granulation effect, and on the other hand, the life of the device
can be prolonged.
[0052] The shaft cooling air duct includes a motor seal cover 210,
an air duct inner sleeve 217, a shaft sleeve 222, and a rotating
shaft 223. The sealing cover 210 surrounds the outer circumference
of the motor 209, and the inner sleeve 217 and the shaft sleeve 222
are sleeved on the outer circumference of the rotating shaft 223;
the inner rings of the temperature-resistant thrust bearing 212 and
the temperature-resistant positioning bearing 221 are fixed on the
rotating shaft 223, and the outer ring Fixed to the inner wall of
the inner sleeve 217 of the air duct; the shaft sleeve 222 is fixed
between the outer ring of the upper temperature-resistant bearing
and the outer ring of the lower temperature-resistant bearing
thereof, and the temperature-resistant blade 224 is surrounded
therein; the temperature-resistant thrust bearing 212 and The air
temperature locating bearing 221 is provided with a supply air flow
path 218. A granulator fixing device 232 is fixed to the top of the
rotating shaft 223.
[0053] The sealing cover 210 is fixedly connected to the inner tube
sleeve 217, communicates through the vent 226, and the shaft
cooling air enters from the sealing cover tuyere 227. After cooling
the rotating shaft 223 through the inside of the shaft sleeve 222,
most of it enters the granulator fixing device 232. The air flow
passage 233 enters the granulation chamber from the plurality of
first tuyere 236 and the second tuyere 235 which are annularly
distributed from the top and the side wall of the granulator fixing
device 232, and a small portion from the granulator fixing device
232 and the inner tube sleeve 217 A narrow gap enters the
granulation bin. An outer tube sleeve 216 is disposed on the outer
circumference of the inner tube sleeve 217, and an annular cooling
air passage is formed between the inner tube sleeve 217 and the
outer tube sleeve 216. The top of the annular cooling air channel
is annularly arranged with a plurality of hoods 220, and the hood
220 The air outlet is lower than the air outlets of the first
tuyere 236 and the second tuyere 235. An annular cooling air duct
air inlet 225 is opened at the bottom of the outer tube sleeve
216.
[0054] In the present invention, the granulator fixing device 232
is composed of two parts, left and right, and is fixed by a pin and
a hoop. When the granulator 219 is damaged, the pin is removed, the
granulator 219 and the granulator fixing device 232 can be removed,
the pin and the hoop can be removed, and the left and right parts
of the granulator fixing device 232 can be disassembled and
removed. The granulator 219 can be removed after the annular clamp.
When the granulator 219 is cracked, the cracked granulator 219 is
not smashed due to the presence of the granulator base and the
fixture, and the liquid slag does not drip directly onto the
transmission and the motor 209. Ensure system safety before
downtime. At the same time, it is only necessary to replace the
granulator 219, which reduces the cost of replacing the entire
granulator by the general granulator 219 due to damage. The
granulator fixing device 232 is internally provided with a
streamlined flow passage 233; at the same time, the gap between the
bottom side of the granulator base and the inner sleeve 217 of the
air duct is small, so that most of the wind sent from the lower
portion of the granulator base can enter. To the streamlined flow
passage 233, the granulator fixture 232 is cooled while
facilitating the blowing of wind from the granulator base to the
edge of the granulator 219 to enhance granulation.
[0055] In the present invention, the rotating shaft 223 and the
granulator fixing device 232 are connected by a hollow flange, and
the hollow flange has a section of air heat insulating layer
between the granulator base and the rotating shaft 223 to block the
granulator 219 and the rotating shaft 223. The heat transfer
between the granulator base is not transmitted to the rotating
shaft 223, so that the granulator 219 can be safely and stably
operated, and the granulation effect can be better realized.
[0056] There are three ways to generate the shaft cooling air: mode
one, the cooling air is generated by the fan, entering from the
sealing hood tuyere 227, most of the annular air duct passing
through the granulator fixing device enters the granulation
chamber, and a small part is from the fixing device and the air
duct inner sleeve. The narrow gap between the cylinders 217 enters
the granulation chamber; in the second embodiment, the first and
second or multi-stage small temperature-resistant blades 224 are
arranged on the rotating shaft 223, and the cooling wind is
generated by the high-speed rotation of the rotating shaft, and
most of them are fixed by the granulator. The annular duct of unit
232 enters the granulation chamber and a small portion enters the
granulation chamber from a narrow gap between the fixture and the
inner sleeve 217 of the duct. The rotating shaft 223 is provided
with one-stage, two-stage or multi-stage small
temperature-resistant blades 224. When the rotating shaft 223
rotates at a high speed, on the one hand, the flow power of the
shaft cooling air passage is generated, and the acceleration shaft
cooling air shaft and the granulator fixing device are generated.
Cooling, on the other hand, the temperature-resistant blade 224 can
also be used as a rib structure to enhance the overall heat
dissipation of the rotating shaft 223; in the third mode, the wind
blower and the small temperature-resistant blade are combined with
the high-speed rotating wind as the shaft cooling wind, and the
shaft cooling wind Cooling of components such as the track and the
shaft.
[0057] One skilled in the art will understand that the embodiment
of the present invention as shown in the drawings and described
above is exemplary only and not intended to be limiting.
[0058] It will thus be seen that the objects of the present
invention have been fully and effectively accomplished. Its
embodiments have been shown and described for the purposes of
illustrating the functional and structural principles of the
present invention and is subject to change without departure from
such principles. Therefore, this invention includes all
modifications encompassed within the spirit and scope of the
following claims.
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