U.S. patent application number 16/474141 was filed with the patent office on 2019-11-14 for online temperature monitoring system and method for direct air-cooled condenser.
This patent application is currently assigned to L'Air Liquide, Societe Anonyme pour I'Etude et I'Exploitation des Procedes Georges Claude. The applicant listed for this patent is L'Air Liquide, Societe Anonyme pour I'Etude et I'Exploitation des Procedes Georges Claude. Invention is credited to Yuanyuan DUAN, Hansen GUO.
Application Number | 20190346207 16/474141 |
Document ID | / |
Family ID | 62707509 |
Filed Date | 2019-11-14 |
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United States Patent
Application |
20190346207 |
Kind Code |
A1 |
GUO; Hansen ; et
al. |
November 14, 2019 |
ONLINE TEMPERATURE MONITORING SYSTEM AND METHOD FOR DIRECT
AIR-COOLED CONDENSER
Abstract
The present invention relates to an online temperature
monitoring system and method for a direct air-cooled condenser. A
temperature sensor moving system is arranged on the surface of the
heat exchange tube bundle of the direct air-cooled condenser, and a
temperature sensor is installed on said temperature sensor moving
system and moves on a plane parallel to the surface of the heat
exchange tube bundle. The data collected by the temperature sensor
is uploaded to a connected data processing system. Said system can
collect, analyze, store and query data and give an alarm based on
the predefined settings. Compared with the distribution of a
plurality of monitoring cables in the prior art, the present
invention realizes the scanning of a plurality of monitoring
points, simplifies the cable distribution, avoids any blind
monitoring area, and has flexibility.
Inventors: |
GUO; Hansen; (Zhejiang,
CN) ; DUAN; Yuanyuan; (Zhejiang, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
L'Air Liquide, Societe Anonyme pour I'Etude et I'Exploitation des
Procedes Georges Claude |
Paris |
|
FR |
|
|
Assignee: |
L'Air Liquide, Societe Anonyme pour
I'Etude et I'Exploitation des Procedes Georges Claude
Paris
FR
|
Family ID: |
62707509 |
Appl. No.: |
16/474141 |
Filed: |
December 30, 2016 |
PCT Filed: |
December 30, 2016 |
PCT NO: |
PCT/CN2016/113394 |
371 Date: |
June 27, 2019 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F28F 2265/14 20130101;
F28F 19/006 20130101; F28B 11/00 20130101; F28B 1/06 20130101; F28G
15/003 20130101; F28D 1/04 20130101; F28F 27/00 20130101 |
International
Class: |
F28B 11/00 20060101
F28B011/00 |
Claims
1-17. (canceled)
18. An online temperature monitoring system for a direct air-cooled
condenser, the online temperature monitoring system comprising: a
temperature sensor; a temperature sensor moving system; and a data
processing system, wherein the temperature sensor moving system is
configured to allow for the temperature sensor to move on a plane
parallel to a surface of a heat exchange tube bundle of the direct
air-cooled condenser.
19. The online temperature monitoring system according to claim 18,
wherein the path which said temperature sensor moving system moves
along and the area which the temperature sensor scans are preset
according to different arrangement forms of heat exchange tubes of
the direct air-cooled condenser.
20. The online temperature monitoring system according to claim 18,
wherein said data processing system is connected to the temperature
sensor to collect, analyze, store, and query the data collected by
the temperature sensor and give an alarm based on the predefined
settings.
21. The online temperature monitoring system according to claim 19,
wherein multi-mode control is realized according to the field
configuration.
22. The online temperature monitoring system according to claim 18,
wherein said temperature sensor moving system comprises the nozzle
assembly of the washing system of the direct air-cooled
condenser.
23. The online temperature monitoring system according to claim 18,
wherein said temperature sensor is an infrared thermometer.
24. The online temperature monitoring system according to claim 23,
wherein different specifications are selected for the infrared
thermometer according to the field environmental conditions.
25. The online temperature monitoring system according to claim 24,
wherein said temperature sensor is installed with a universal
joint.
26. The online temperature monitoring system for a direct
air-cooled condenser according to claim 25, wherein said
temperature sensor is perpendicular to the surface of the heat
exchange tube bundle of the direct air-cooled condenser.
27. An online temperature monitoring method for a direct air-cooled
condenser, wherein the method comprises the steps of: arranging a
temperature sensor moving system on the surface of the heat
exchange tube bundle of the direct air-cooled condenser; installing
a temperature sensor on said temperature sensor moving system,
wherein the temperature sensor is configured to move on a plane
parallel to the surface of the heat exchange tube bundle of the
direct air-cooled condenser; and uploading the data collected by
the temperature sensor to a connected data processing system,
wherein said system can collect, analyse, store and query data and
give an alarm based on the predefined settings.
28. The online temperature monitoring method according to claim 27,
wherein the path which the temperature sensor moving system moves
along and the area which the temperature sensor scans are preset
according to different arrangement forms of heat exchange tubes of
the direct air-cooled condenser.
29. The online temperature monitoring method according to claim 28,
wherein multi-mode control is realized according to the field
configuration.
30. The online temperature monitoring method according to claim 27,
wherein said temperature sensor moving system comprises the nozzle
assembly of the washing system of the direct air-cooled
condenser.
31. The online temperature monitoring method according to claim 28,
wherein said temperature sensor is an infrared thermometer.
32. The online temperature monitoring method according to claim 31,
wherein different specifications are selected for the infrared
thermometer according to the field environmental conditions.
33. The online temperature monitoring method according to claim 32,
wherein said temperature sensor is installed with a universal
joint.
34. The online temperature monitoring method according to claim 33,
wherein said temperature sensor is perpendicular to the surface of
the heat exchange tube bundle of the direct air-cooled
condenser.
35. An application using the nozzle assembly of the washing system
of a direct air-cooled condenser as a part of a temperature sensor
moving system, wherein said temperature sensor moving system is a
part of the online temperature monitoring system for the direct
air-cooled condenser as claimed in claim 18, and said system
further comprises a temperature sensor and a data processing
system, wherein at least one temperature sensor is installed on the
nozzle assembly of the washing system of said direct air-cooled
condenser and said temperature sensor moves on a plane parallel to
the surface of the heat exchange tube bundle of the direct
air-cooled condenser.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application is a .sctn. 371 of International PCT
Application PCT/CN2016/113394, filed Dec. 30, 2016, which is herein
incorporated by reference in its entirety.
TECHNICAL FIELD
[0002] The present invention relates to an online temperature
monitoring system and method for a direct air-cooled condenser, and
in particular relates to a mobile online temperature monitoring
system and method for a direct air-cooled condenser.
BACKGROUND ART
[0003] A direct air-cooled condenser is used to condense
low-pressure steam discharged from a steam turbine so that
low-pressure steam becomes condensate water. The direct air-cooled
condenser mainly consists of an axial flow fan system, an A-frame
support system, a condensate system, a draining system, a tube
bundle system, a vacuum pumping system and a washing system. The
tube bundle is made of steel parent tubes and external finned heat
exchange tubes, which are arranged according to a certain rule and
are welded to a tube plate at the two ends. The cross section of
the parent tubes is round, elliptical or oblate. The fins are made
of galvanized aluminium or galvanized steel and are attached to the
parent tubes through twining, nesting, soldering or extrusion
forming. Steam directly exchanges heat with air through the
surfaces of metallic finned heat exchange tubes, with low-pressure
steam inside the heat exchange tubes and the atmosphere outside the
heat exchange tubes. Heat exchange tubes can be classified into a
single-row tube system, double-row tube system, three-row tube
system and four-row tube (MASH) system according to the arrangement
forms. When the ambient temperature is below 0.degree. C., since
the thermal load of the heat exchange tubes is too small or is
distributed unevenly and non-condensable gases exist, the heat
exchange tube bundle is very easy to block up or freeze, or even
the tube bundle and condensate tubes deform and freeze such that
they crack during the start of the equipment or at the time of a
low load, resulting in the stop of related equipment. Therefore, it
is very necessary to monitor the temperature of a direct air-cooled
condenser in winter so as to learn the running state of the direct
air-cooled condenser and adjust the axial flow fan accordingly in
time.
[0004] Currently, the following solution is usually adopted to
measure the temperature of the heat exchange tube bundle of a
direct air-cooled condenser: 1) A worker is assigned to perform
manual patrol inspections. However, the working environment for
manual patrol inspections is adverse and the labor intensity is
big. Most importantly, manual patrol inspections cannot realize
real-time monitoring and the worker fails to make real-time
adjustments in time according to the field conditions. 2) An online
temperature field monitoring system for an indirect air-cooled
condenser is provided in CN205537182U, and the system comprises a
plurality of monitoring cables, a plurality of collectors, a
communication cable and a main controller, wherein one or more
monitoring cables of the plurality of monitoring cables are
respectively electrically connected to one collector of said
plurality of collectors and the collectors are respectively
electrically connected to the main controller with the
communication cable. The plurality of monitoring cables are
arranged in the outer area of the heat exchange tube bundle and the
online temperature field monitoring is realized by use of a digital
temperature sensor. However, since said system comprises a
plurality of monitoring cables, a plurality of collectors and a
communication cable, the installation and maintenance cost is high,
verifications are time consuming and labour consuming. In addition,
once the temperature sensor fails, it is very difficult to replace
it. Furthermore, cable distribution requires large space, the heat
exchange efficiency is affected if the cables are not removed in
summer, and the system is not flexible because the temperature
collecting points are fixed to cause blind monitoring areas.
TECHNICAL PROBLEM
[0005] To overcome the defects of the prior art, embodiments the
present invention is intended to provide an online temperature
monitoring system and method for a direct air-cooled condenser, and
in particular, a mobile online temperature monitoring system and
method for a direct air-cooled condenser.
SUMMARY OF THE INVENTION
[0006] According to one aspect of the present invention, an online
temperature monitoring system for a direct air-cooled condenser is
provided.
[0007] According to the present invention, the online temperature
monitoring system for a direct air-cooled condenser comprises a
temperature sensor, a temperature sensor moving system and a data
processing system, and is characterized in that the temperature
sensor moving system enables the temperature sensor to move on a
plane parallel to the surface of the heat exchange tube bundle of
the direct air-cooled condenser.
[0008] The path which said temperature sensor moving system moves
along and the area which the temperature sensor scans are preset
according to different arrangement forms of heat exchange tubes of
the direct air-cooled condenser.
[0009] Said data processing system is connected to the temperature
sensor to collect, analyse, store, and query the data collected by
the temperature sensor and give an alarm based on the predefined
settings.
[0010] Favorably, multi-mode control is realized according to the
field configuration.
[0011] Favorably, said temperature sensor moving system comprises
the nozzle assembly of the washing system of the direct air-cooled
condenser.
[0012] Favorably, said temperature sensor is an infrared
thermometer.
[0013] Favorably, different specifications are selected for the
infrared thermometer according to the field environmental
conditions.
[0014] Favorably, said temperature sensor is installed with a
universal joint.
[0015] Favorably, said temperature sensor is perpendicular to the
surface of the heat exchange tube bundle of the direct air-cooled
condenser.
[0016] According to another aspect of the present invention, an
online temperature monitoring method for a direct air-cooled
condenser is provided.
[0017] According to the present invention, the online temperature
monitoring method for a direct air-cooled condenser is
characterized in that the method comprises: arranging a temperature
sensor moving system on the surface of the heat exchange tube
bundle of the direct air-cooled condenser, wherein a temperature
sensor is installed on said temperature sensor moving system and
the temperature sensor moves on a plane parallel to the surface of
the heat exchange tube bundle of the direct air-cooled condenser;
uploading the data collected by the temperature sensor to a
connected data processing system, wherein said system can collect,
analyse, store and query data and give an alarm based on the
predefined settings.
[0018] According to a further aspect of the present invention, an
application using the nozzle assembly of the washing system of a
direct air-cooled condenser as a part of the temperature sensor
moving system is provided and is characterized in that said
temperature sensor moving system is a part of the online
temperature monitoring system for the direct air-cooled condenser,
and said system further comprises a temperature sensor and a data
processing system, wherein at least one temperature sensor is
installed on the nozzle assembly of the washing system of said
direct air-cooled condenser and said temperature sensor moves on a
plane parallel to the surface of the heat exchange tube bundle of
the direct air-cooled condenser.
Advantageous Effects
[0019] Compared with the prior art, certain embodiments of the
present invention have the following advantageous effects:
[0020] 1. With the online temperature monitoring system for a
direct air-cooled condenser in the present invention, the
temperatures in easy-to-freeze areas of a direct air-cooled
condenser can favorably and continuously be monitored in real
time.
[0021] 2. Compared with the distribution of a plurality of
monitoring cables, the present invention realizes the scanning of a
plurality of monitoring points, simplifies the cable distribution,
avoids any blind monitoring area, and has flexibility.
[0022] 3. In the present invention, the path which the temperature
sensor moving system moves along and the area which the temperature
sensor scans can be preset by use of a programmable controller
according to different arrangement forms of heat exchange tubes of
the direct air-cooled condenser.
[0023] 4. In the present invention, the programmable controller can
be configured offline, and thus the path which the temperature
sensor moving system moves along and the area which the temperature
sensor scans can be adjusted according to the special requirements
of the user to realize multi-mode control.
[0024] 5. The present invention fully utilizes a washing system
with basic configurations, without any new equipment investment,
and in addition, it is easy to perform upgrades and transformation
in the existing direct air-cooled condenser system. Thus,
installation is convenient, time for installation is saved and the
cost is reduced.
BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Further features, advantages and possible applications of
the invention are apparent from the following description of
working and numerical examples and from the drawings. All described
and/or depicted features on their own or in any desired combination
form the subject matter of the invention, irrespective of the way
in which they are combined in the claims the way in which said
claims refer back to one another.
[0026] The following will further describe the embodiments of the
present invention by reference to the drawings. In the
drawings,
[0027] FIG. 1 shows the connections of the components of the online
temperature monitoring system for a direct air-cooled condenser in
the present invention, wherein the nozzle assembly of the washing
system of the direct air-cooled condenser is preferably used as a
part of the temperature sensor moving system;
[0028] FIG. 2 shows the preset path which the temperature sensor
moving system moves along and the preset area which the temperature
sensor scans for a four-row tube (MASH) system in the present
invention;
[0029] FIG. 3 shows the preset path which the temperature sensor
moving system moves along and the preset area which the temperature
sensor scans for a single-row tube system, a double-row tube system
or a three-row tube system in the present invention.
MODE OF CARRYING OUT THE INVENTION
[0030] The "temperature sensor" refers to a sensor which can sense
a temperature and convert the temperature into an available output
signal. The temperature sensor is a core part of a temperature
measuring instrument. There are many types of temperature sensors.
Temperature sensors are classified into two categories according to
the measuring mode: contact temperature sensor and non-contact
temperature sensor. A non-contact temperature sensor does not need
to contact the measured medium, and the thermal radiation or
convection of the measured medium is transferred to the temperature
sensor to achieve the purpose of temperature measurement.
Non-contact temperature sensors mainly include infrared
thermometers. The environmental conditions, for example,
temperature, dust, smog and steam, where infrared thermometers are
located, influence both the selected specifications and the
measurement accuracy.
[0031] The "temperature sensor moving system" refers to the system
which is installed on the surface of the heat exchange tube bundle
on the A-frame of the direct air-cooled condenser and moves on a
plane parallel to the surface of the heat exchange tube bundle of
the direct air-cooled condenser, for example, the nozzle assembly
of the washing system of the direct air-cooled condenser.
[0032] The "data processing system" refers to a system which
applies a computer to process information. Through the data
information processing and organization by the data processing
system, various analysis indexes are obtained from calculations and
are converted into an information form which is easily accepted by
people, and the processed information can be stored. The data
processing system is usually a distributed control system (DCS)
applied in the automatic control industry. The DCS is a multi-level
computer system consisting of a process control level and a process
monitoring level and linked with a communication network, and
integrates 4C technologies (computer technology, communication
technology, CRT (cathode-ray tube) technology and control
technology). The basic idea of the DCS is decentralized control,
centralized operation, hierarchical management, and flexible and
convenient configuration. Thus, the functions of collecting,
analysing, storing and querying data collected by the temperature
sensor and giving an alarm based on the predefined settings in the
present invention can be realized.
[0033] Heat exchange tubes can be classified into a single-row tube
system, double-row tube system, three-row tube system and four-row
tube (MASH) system according to the arrangement forms, and the
arrangement form of the heat exchange tubes determines the path
which the temperature sensor moves along and the area which the
temperature sensor scans.
[0034] Heat exchange tubes of a direct air-cooled condenser are
classified into parallel-flow tubes and counter-flow tubes. A heat
exchange tube is a parallel-flow tube if the flowing directions of
steam and condensate water in the heat exchange tube are the same,
and is a counter-flow tube if the flowing directions of steam and
condensate water in the heat exchange tube are opposite. Most steam
condenses in parallel-flow tubes, and steam in the counter-flow
tube bundle condenses by flowing in an opposite direction, that is
to say, remaining steam and non-condensable gases flow from the
bottom to the top in the counter-flow tubes. During this process,
some condensate water is still produced and flows downward.
Parallel-flow tubes and counter-flow tubes are connected with a
bottom condensate water tank to balance the pressure between the
two sides and the steam side. A vacuum pumping tube bundle is
arranged on the top of the counter-flow tubes to pump out
non-condensable gases and maintain the vacuum state in the
air-cooled condenser. Parallel-flow tubes and counter-flow tubes
can be arranged separately or can be arranged uniformly
together.
[0035] The arrangement forms of parallel-flow tubes and
counter-flow tubes are classified into four types: the first type
is the four-row tube (MASH) system which consists of three rows of
inner parallel-flow tubes near the A-frame and one row of the
outermost counter-flow tubes, the second type is the single-row
arrangement of large-diameter flat steel soldered with aluminium
wave-finned tubes or flat steel tubes hot dip galvanized with steel
fins, the third type is the double-row arrangement of
large-diameter hot dip galvanized elliptical steel tubes covered
with rectangular steel fins, and the fourth type is the three-row
arrangement of large-diameter hot dip galvanized elliptical steel
tubes surrounded by elliptical finned tubes.
[0036] Among the four arrangement forms, for the single-row tube
system, the double-row tube system and the three-row tube system,
parallel-flow tubes and counter-flow tubes are separately arranged,
that is to say, parallel-flow tubes and counter-flow tubes are
distributed in different areas on the whole surface of the heat
exchange tube bundle, and for the four-row tube (MASH) system,
parallel-flow tubes and counter-flow tubes are arranged uniformly
together, that is to say, the three rows of inner parallel-flow
tubes near the A-frame and one row of the outermost counter-flow
tubes are arranged across the whole surface of the heat exchange
tube bundle. Since the steam flow in parallel tubes is adequate but
the steam in the following counter-flow tubes is small in winter,
the counter-flow tube bundle freezes easily. Therefore, the
temperatures of counter-flow tubes need to be mainly monitored
online in the present invention. For a single-row tube system, a
double-row tube system and a three-row tube system, counter-flow
tubes are separately arranged in some areas of the heat exchange
tube bundle (FIG. 3), and for a four-row tube (MASH) system,
counter-flow tubes are arranged in the whole area of the heat
exchange tube bundle (FIG. 2), and therefore, the areas which the
temperature sensor scans are different. In other words, the path
which the temperature sensor moving system moves along and the area
which the temperature sensor scans can be preset by use of a
programmable controller according to different arrangement forms of
heat exchange tubes.
[0037] In addition, for the above-mentioned four arrangement forms,
the parent tubes are uniformly arranged at an equal distance in the
extension direction of the A-frame. To ensure that each column of
parent tubes in the scanning area on the surface of the heat
exchange tube bundle can be scanned, the distance the temperature
sensor moving system moves is set to the distance between parent
tubes in advance. The distance between parent tubes varies with the
arrangement forms of heat exchange tubes.
[0038] "Multi-mode control realization according to the field
configuration" means that the programmable controller is configured
offline to adjust the path which the temperature sensor moving
system moves along and the area the temperature sensor scans
according to the special requirements of the user to realize
multi-mode control. For example, the single-row tube system,
double-row tube system or three-row tube system can be scanned
across the whole surface of the heat exchange tube bundle according
to the requirements of the user.
[0039] After the heat exchange tube bundle of the direct air-cooled
condenser runs for a period of time, dust with strong adhesive
force deposits on the surface of the fins. Dust reduces the heat
exchange capability of the heat exchange tube bundle and directly
affects the operation of the steam turbine. Therefore, the heat
exchange tube bundle must be cleaned regularly. For this reason,
the washing system is a basic configuration of the air-cooled
condenser and the heat exchange tube bundle is washed by
pressurized water sprayed out of the nozzle of the nozzle assembly
of the washing system.
[0040] When the ambient temperature is below 0.degree. C. in
winter, the heat exchange tube bundle is freezes very easily. In
this case, the washing system does not work. Therefore, it is very
necessary to monitor the temperature of a direct air-cooled
condenser in winter so as to learn the running state of the direct
air-cooled condenser and adjust the axial flow fan accordingly in
time. However, the present solution can enable the nozzle assembly
of the washing system to move on a plane parallel to the surface of
the heat exchange tube bundle of the direct air-cooled condenser.
Thus, after a temperature sensor is installed on said nozzle
assembly, the temperature sensor can move on the plane parallel to
the heat exchange tube bundle of the direct air-cooled condenser to
collect data.
[0041] FIG. 1 shows the connections of the components of the online
temperature monitoring system for a direct air-cooled condenser,
wherein the nozzle assembly of the washing system of the direct
air-cooled condenser is preferably used as a part of the
temperature sensor moving system. As shown in FIG. 1, the
temperature sensor 1 is installed on the nozzle assembly 4 of the
washing system 3 of the direct air-cooled condenser to enable the
temperature sensor 1 to move on a plane parallel to the surface 2
of the heat exchange tube bundle of the direct air-cooled
condenser, and the data processing system 5 is connected to the
temperature sensor 1 to collect, analyse, store, and query the data
collected by the temperature sensor and give an alarm based on the
predefined settings. The washing system 3 has upper and lower
lateral guide rails 6, and a mobile washing platform 7 is arranged
between the upper and lower lateral guide rails 6. The mobile
washing platform 7 is driven by a horizontal drive mechanism
arranged at the top to move laterally between the upper and lower
lateral guide rails 6; the upper and lower lateral guide rails 6
are installed on a plane parallel to the surface 2 of the heat
exchange tube bundle of the direct air-cooled condenser; the mobile
washing platform 7 is fixed with a longitudinal guide rail 8 on a
side opposite to the direct air-cooled condenser; the nozzle
assembly 4 is arranged on the mobile washing platform 7 and is
driven by the lifting drive mechanism arranged on the washing
system 3; travel switches 9 are respectively arranged on one guide
rail of the upper and lower lateral guide rails 6 to correspond to
the left and right movement stop points of the mobile washing
platform 7; travel switches 10 are respectively arranged on the
longitudinal guide rail 8 to correspond to the upper and lower
movement stop points of the nozzle assembly 4. The lateral movement
of the mobile washing platform 7 and the longitudinal movement of
the nozzle assembly 4 can be controlled by the programmable
controller. The above-mentioned components are all installed on the
A-frame 11.
EMBODIMENT 1
[0042] FIG. 2 shows the preset path which the temperature sensor
moving system moves along and the preset area which the temperature
sensor scans for a four-row tube (MASH) system. During the start of
the equipment or when the load is low, the area can be limited to a
planar area from the bottom of the heat exchange tube bundle to the
whole tube bundle plane, with an upward and downward movement
height of 1 metre, in order to shorten the scanning period. The
heat exchange tube bundle in this area is freezes the easiest
because the air flow passing through this area is large and a large
amount of heat is carried away. The scanning area and path are
indicated by 12, wherein the distance between parent tubes is
A.
[0043] In a programmable controller system, the buttons and travel
switches serve as input signal elements of the programmable
controller, and the contactors serve as output actuators to control
the forward rotation, backward rotation, stalling, and the running
time of the horizontal drive mechanism which moves laterally and
the lifting drive mechanism which moves longitudinally. The mobile
washing platform can automatically stop when it travels to the left
or right stop point to touch the travel switch 9 or travels to the
upper or lower stop point to touch the travel switch 10.
[0044] When fully automatic control starts, the position of the
mobile washing platform is adjusted to keep the temperature sensor
located just above the central line of the rightmost parent tube
and the nozzle assembly located at the lower stop point; then the
nozzle assembly moves 1000 mm upward, the mobile washing platform
moves 95 mm left, and here the distance A between parent tubes of
the four-row tube system is 95 mm; then the nozzle assembly moves
1000 mm downward, and the mobile washing platform moves 95 mm left;
this process is repeated until the mobile washing platform returns
to the original position after moving to the left stop point. A
scan is performed every 10 minutes or so. If you want to manually
stop the system during the operation, you can press the PAUSE
button and choose to maintain the current position or return to the
original position.
EMBODIMENT 2
[0045] FIG. 3 shows the preset path which the temperature sensor
moving system moves along and the preset area which the temperature
sensor scans for a single-row tube system, a double-row tube system
or a three-row tube system in the present invention. For the
single-row tube system, double-row tube system or three-row tube
system, counter-flow tubes are separately arranged in some areas of
the heat exchange tube bundle, and therefore only the areas where
counter-flow tubes are separately arranged need to be scanned.
During the start of the equipment or when the load is low, the area
can be limited to a planar area in which the upward and downward
movement height from the bottom of the counter-flow tubes is 1
metre, in order to shorten the scanning period. The scanning area
and path are indicated by 13, wherein the distance between parent
tubes is B.
[0046] When fully automatic control starts, the position of the
mobile washing platform is adjusted to keep the temperature sensor
located just above the central line of the rightmost parent tube
and the nozzle assembly located at the lower stop point; then the
nozzle assembly moves 1000 mm upward and the mobile washing
platform moves 58 mm left, and here the distance B between parent
tubes of a single-row tube system, for example, is 58 mm; then the
nozzle assembly moves 1000 mm downward and the mobile washing
platform moves 58 mm left; this process is repeated until the
mobile washing platform returns to the original position after
moving to the left stop point. A scan is performed every 5 minutes
or so. If you want to manually stop the system during the
operation, you can press the PAUSE button and choose to maintain
the current position or return to the original position.
[0047] As a further embodiment, the programmable controller can be
configured offline to adjust the path which the temperature sensor
moving system moves along and the area the temperature sensor scans
according to the special requirements of the user. For example, the
single-row tube system, double-row tube system or three-row tube
system can be scanned across the whole surface of the heat exchange
tube bundle according to the requirements of the user.
[0048] For the above-mentioned embodiments, when the acquired
temperature is below 20.degree. C., an alarm will be triggered and
the data processing system will record the first appearance. The
first appearance refers to the first alarm signal which appears
when an accident trip happens. This signal is very important to the
analysis of the accident cause and can basically be considered as
the major cause for an equipment protection action. Thus, the
running state of the direct air-cooled condenser can be learned in
time and the axial flow fan can be adjusted accordingly.
[0049] Although the nozzle assembly of the washing system of the
direct air-cooled condenser is used as a part of the temperature
sensor moving system in the above-mentioned description, those
skilled in the art can appreciate that the present invention also
applies to any apparent modification made without departing from
the conception of the present invention, for example, the addition
of an extra temperature sensor moving system to realize the
function of moving the temperature sensor on a plane parallel to
the surface of the heat exchange tube bundle of the direct
air-cooled condenser.
[0050] While the invention has been described in conjunction with
specific embodiments thereof, it is evident that many alternatives,
modifications, and variations will be apparent to those skilled in
the art in light of the foregoing description. Accordingly, it is
intended to embrace all such alternatives, modifications, and
variations as fall within the spirit and broad scope of the
appended claims. The present invention may suitably comprise,
consist or consist essentially of the elements disclosed and may be
practiced in the absence of an element not disclosed. Furthermore,
if there is language referring to order, such as first and second,
it should be understood in an exemplary sense and not in a limiting
sense. For example, it can be recognized by those skilled in the
art that certain steps can be combined into a single step.
[0051] The singular forms "a", "an" and "the" include plural
referents, unless the context clearly dictates otherwise.
[0052] "Comprising" in a claim is an open transitional term which
means the subsequently identified claim elements are a nonexclusive
listing (i.e., anything else may be additionally included and
remain within the scope of "comprising"). "Comprising" as used
herein may be replaced by the more limited transitional terms
"consisting essentially of" and "consisting of" unless otherwise
indicated herein.
[0053] "Providing" in a claim is defined to mean furnishing,
supplying, making available, or preparing something. The step may
be performed by any actor in the absence of express language in the
claim to the contrary.
[0054] Optional or optionally means that the subsequently described
event or circumstances may or may not occur. The description
includes instances where the event or circumstance occurs and
instances where it does not occur.
[0055] Ranges may be expressed herein as from about one particular
value, and/or to about another particular value. When such a range
is expressed, it is to be understood that another embodiment is
from the one particular value and/or to the other particular value,
along with all combinations within said range.
[0056] All references identified herein are each hereby
incorporated by reference into this application in their
entireties, as well as for the specific information for which each
is cited.
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