U.S. patent application number 12/629771 was filed with the patent office on 2010-06-10 for vessel for cooling syngas.
Invention is credited to Thomas Ebner, Wouter Koen Harteveld, Manfred Heinrich Schmitz-Goeb.
Application Number | 20100139581 12/629771 |
Document ID | / |
Family ID | 40622141 |
Filed Date | 2010-06-10 |
United States Patent
Application |
20100139581 |
Kind Code |
A1 |
Ebner; Thomas ; et
al. |
June 10, 2010 |
VESSEL FOR COOLING SYNGAS
Abstract
A vessel for cooling syngas comprising a syngas collection
chamber and a quench chamber, wherein the syngas collection chamber
has a syngas outlet which is fluidly connected with the quench
chamber via a tubular diptube, wherein the diameter of the diptube
at the end nearest to the syngas collection chamber is greater than
the diameter of the diptube at the end terminating at the quench
chamber.
Inventors: |
Ebner; Thomas; (Gummersbach,
DE) ; Harteveld; Wouter Koen; (Amsterdam, NL)
; Schmitz-Goeb; Manfred Heinrich; (Gummersbach,
DE) |
Correspondence
Address: |
SHELL OIL COMPANY
P O BOX 2463
HOUSTON
TX
772522463
US
|
Family ID: |
40622141 |
Appl. No.: |
12/629771 |
Filed: |
December 2, 2009 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
61120996 |
Dec 9, 2008 |
|
|
|
Current U.S.
Class: |
122/7R |
Current CPC
Class: |
C10K 1/101 20130101;
C10J 3/76 20130101; C10K 1/04 20130101; C10J 2200/152 20130101;
F28C 3/06 20130101; C10J 3/845 20130101; C10J 3/485 20130101; C10J
3/84 20130101 |
Class at
Publication: |
122/7.R |
International
Class: |
F22B 1/18 20060101
F22B001/18 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 4, 2008 |
EP |
08170722.6 |
Claims
1. A vessel for cooling syngas comprising: a syngas collection
chamber and a quench chamber, wherein the syngas collection chamber
has a syngas outlet which is fluidly connected with the quench
chamber via a tubular diptube, wherein the diameter of the diptube
at the end nearest to the syngas collection chamber is greater than
the diameter of the diptube at the end terminating at the quench
chamber, wherein the syngas outlet comprises a tubular part,
co-axial with the diptube, having a diameter which is smaller than
the diameter of the tubular diptube at the end nearest to the
syngas collection chamber, wherein the tubular part terminates at a
point within the diptube such that an annular space is formed
between the tubular part and the diptube, and wherein in the
annular space a discharge conduit for liquid water is present
having a discharge opening located such to direct the liquid water
along the inner wall of the diptube, and wherein nozzles are
positioned in the larger diameter part of the diptube such that in
use droplets of water are sprayed via these nozzles into the syngas
as it flows downwardly through the diptube.
2. A vessel according to claim 1, wherein the diptube comprises a
tubular part with the larger diameter and a tubular part with the
smaller diameter which parts are fixed together by a frusto conical
part.
3. A vessel according to claim 1, wherein the ratio between the
larger diameter and the smaller diameter of the diptube is between
1.25:1 and 2:1.
4. A vessel according to claim 1, wherein at the end of the diptube
which is nearest to the syngas collection a discharge conduit is
present having an outflow opening for liquid water directed such
that, in use, a film of water is achieved along the inner wall of
the diptube.
5. A vessel according to claim 1, wherein the syngas collection
chamber comprises an arrangement of interconnected parallel
arranged tubes resulting in a gas-tight tubular wall running from a
distributor to a header, said distributor provided with a cooling
water supply conduit and said header provided with a steam/water
discharge conduit.
6. A vessel according to claim 1, wherein the diptube is partly
submerged in a water bath at the end terminating at the quench
chamber.
7. A vessel according to claim 1, wherein a draft tube is present
around the lower end of the diptube forming an annular space
between the draft tube and the diptube.
8. A vessel according to claim 7, wherein a deflector plate extends
from the outer wall of the diptube at the upper discharge end of
the annular space.
9. A vessel according to claim 2, wherein a tubular part is
connected to the bottom of the frusto conical part, such that the
lower end of the tubular part terminates below the discharge
conduit.
10. A vessel according to claim 9, wherein at least half of the
vertical length of the tubular part extends below the discharge
conduit.
11. A vessel for cooling syngas comprising: a syngas collection
chamber and a quench chamber, wherein the syngas collection chamber
has a syngas outlet which is fluidly connected with the quench
chamber via a tubular diptube, wherein the diameter of the diptube
at the end nearest to the syngas collection chamber is greater than
the diameter of the diptube at the end terminating at the quench
chamber, wherein the ratio between the larger diameter and the
smaller diameter of the diptube is between 1.25:1 and 2:1, wherein
the syngas outlet comprises a tubular part, co-axial with the
diptube, having a diameter which is smaller than the diameter of
the tubular diptube at the end nearest to the syngas collection
chamber, wherein the tubular part terminates at a point within the
diptube such that an annular space is formed between the tubular
part and the diptube, and wherein in the annular space a discharge
conduit for liquid water is present having a discharge opening
located such to direct the liquid water along the inner wall of the
diptube, and wherein nozzles are positioned in the larger diameter
part of the diptube such that in use droplets of water are sprayed
via these nozzles into the syngas as it flows downwardly through
the diptube.
12. A vessel according to claim 11, wherein the diptube comprises a
tubular part with the larger diameter and a tubular part with the
smaller diameter which parts are fixed together by a frusto conical
part.
13. A vessel according to claim 11, wherein a draft tube is present
around the lower end of the diptube forming an annular space
between the draft tube and the diptube.
14. A vessel according to claim 13, wherein a deflector plate
extends from the outer wall of the diptube at the upper discharge
end of the annular space.
15. A vessel according to claim 12, wherein a tubular part is
connected to the bottom of the frusto conical part, such that the
lower end of the tubular part terminates below the discharge
conduit.
16. A vessel according to claim 15, wherein at least half of the
vertical length of the tubular part extends below the discharge
conduit.
17. A vessel for cooling syngas comprising: a syngas collection
chamber and a quench chamber, wherein the syngas collection chamber
has a syngas outlet which is fluidly connected with the quench
chamber via a tubular diptube, wherein the diameter of the diptube
at the end nearest to the syngas collection chamber is greater than
the diameter of the diptube at the end terminating at the quench
chamber, wherein the syngas outlet comprises a tubular part,
co-axial with the diptube, having a diameter which is smaller than
the diameter of the tubular diptube at the end nearest to the
syngas collection chamber, wherein the tubular part terminates at a
point within the diptube such that an annular space is formed
between the tubular part and the diptube, and wherein in the
annular space a discharge conduit for liquid water is present
having a discharge opening located such to direct the liquid water
along the inner wall of the diptube, wherein nozzles are positioned
in the larger diameter part of the diptube such that in use
droplets of water are sprayed via these nozzles into the syngas as
it flows downwardly through the diptube, and wherein at the end of
the diptube which is nearest to the syngas collection a discharge
conduit is present having an outflow opening for liquid water
directed such that, in use, a film of water is achieved along the
inner wall of the diptube.
18. A vessel according to claim 17, wherein the diptube comprises a
tubular part with the larger diameter and a tubular part with the
smaller diameter which parts are fixed together by a frusto conical
part.
19. A vessel according to claim 18, wherein a tubular part is
connected to the bottom of the frusto conical part, such that the
lower end of the tubular part terminates below the discharge
conduit.
20. A vessel according to claim 19, wherein at least half of the
vertical length of the tubular part extends below the discharge
conduit.
Description
[0001] This application claims the benefit of European Application
No. 08170722.6 filed Dec. 4, 2008 and U.S. Provisional Application
No. 61/120,996 filed Dec. 9, 2008, both of which are incorporated
herein by reference.
BACKGROUND OF THE INVENTION
[0002] The invention is directed to a vessel for cooling syngas
comprising a syngas collection chamber and a quench chamber. The
syngas outlet of the syngas collection chamber is fluidly connected
with the quench chamber via a tubular diptube.
[0003] Such a vessel is described in U.S. Pat. No. 4,828,578. This
publication describes a gasification reactor having a reaction
chamber provided with a burner wherein a fuel and oxidant are
partially oxidized to produce a hot gaseous product. The hot gases
are passed via a constricted throat to be cooled in a liquid bath
located below the reaction chamber. A diptube guides the hot gases
into the bath. At the upper end of the diptube a quench ring is
present. The quench ring has a toroidal body fluidly connected with
a pressurized water source. A narrow channel formed in said body
carries a flow of water to cool the inner wall of the diptube. The
quench ring also has openings to spray water into the flow of hot
gas as it passes the quench ring.
[0004] U.S. Pat. No. 5,271,243 describes a device for cooling hot
gases deriving from incomplete oxidation in a reactor and loaded
with solids. A pressurized vessel accommodates a refrigerator made
of cooled pipe-slab walls at the top and a water bath for quench
cooling at the bottom. The vessel also accommodates a
gas-collecting section upstream of a first gas outlet and another
gas-collecting section upstream of a second gas outlet.
Accommodated in the first gas-collecting section is a shower ring,
which is supplied with water from a circulation system. The ring
sprays the gas leaving the refrigerator and lowers its temperature
further before the gas exits through the gas outlets.
[0005] U.S. Pat. No. 4,808,197 discloses a combination diptube and
quench ring, which is communicated with a pressurized source of a
liquid coolant such as water and which directs a flow thereof
against the diptube guide surfaces to maintain such surfaces in a
wetted condition.
[0006] U.S. Pat. No. 5,976,203 describes a synthesis gas generator
with combustion and quench chambers for generating, cooling and
cleaning gases that are generated by partial oxidation, such
generator including quench nozzles for spraying a quenching medium
in a finely distributed form into the useful gas stream. The
described generator further includes a cone arranged at the outlet
of the quench chamber extending into the water bath chamber gas
space.
[0007] WO 2008/065184 describes a vessel for cooling syngas wherein
the wall of the reaction chamber is made of an arrangement of
interconnected parallel arranged tubes resulting in a substantially
gas-tight wall. The described vessel further contains a diptube
that is partially submerged in a water bath. Preferably at the
upper end of the diptube, injecting means are present to add a
quenching medium to the, in use, downwardly flowing hot product
gas.
SUMMARY OF THE INVENTION
[0008] None of U.S. Pat. No. 5,271,243, U.S. Pat. No. 4,808,197,
U.S. Pat. No. 5,976,203 or WO 2008/065184 discloses the improved
vessel design disclosed and claimed herein, wherein the diameter of
the diptube at the end nearest to the syngas collection chamber is
greater than the diameter of the diptube at the end terminating at
the quench chamber and which comprises both a quench ring supplying
a film of water to the surface of the diptube and water spray
nozzles located in the diptube to spray droplets of water into the
syngas as it flows downwardly through the diptube.
[0009] The present invention aims to provide an improved design for
a vessel for cooling syngas comprising a syngas collection chamber
and a quench chamber.
[0010] This is achieved by a vessel for cooling syngas
comprising
[0011] a syngas collection chamber and a quench chamber, wherein
the syngas collection chamber has a syngas outlet which is fluidly
connected with the quench chamber via a tubular diptube,
[0012] wherein the diameter of the diptube at the end nearest to
the syngas collection chamber is greater than the diameter of the
diptube at the end terminating at the quench chamber,
[0013] wherein a discharge conduit is preferably present having an
outflow opening for liquid water directed such that, in use, a film
of water is achieved along the inner wall of the diptube, and
[0014] wherein water spray nozzles are located in the diptube to
spray droplets of water into the syngas as it flows downwardly
through the diptube.
[0015] Applicants found that by a diptube as claimed a more
efficient vessel for cooling is provided. Preferably the diptube
comprises a tubular part with the larger diameter and a tubular
part with the smaller diameter which parts are fixed together by a
frusto conical part. The diptube may also comprise a tubular part
with the larger diameter connected with only a frusto conical part
at the end terminating at the quench chamber. Preferably the ratio
between the larger diameter and the smaller diameter is between
1.25:1 and 2:1.
BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The invention and its preferred embodiments will be further
described by means of the following figures.
[0017] FIG. 1 is a cooling vessel according to the invention.
[0018] FIG. 2 is a side-view of detail A of FIG. 1.
[0019] FIG. 3 is a top view of detail A of FIG. 1.
[0020] FIG. 4 is a gasification reactor according to the
invention.
[0021] FIG. 4a shows an alternative design for a section of the
reactor of FIG. 4.
DETAILED DESCRIPTION OF THE INVENTION
[0022] Syngas has the meaning of a mixture comprising carbon
monoxide and hydrogen. The syngas is preferably prepared by
gasification of an ash comprising carbonaceous feedstock, such as
for example coal, petroleum coke, biomass and deasphalted tar sands
residues. The coal may be lignite, bituminous coal, sub-bituminous
coal, anthracite coal and brown coal. The syngas as present in the
syngas collection chamber may have a temperature ranging from 600
to 1500.degree. C. and a pressure of between 2 and 10 MPa. The
syngas is preferably cooled, in the vessel according the present
invention, to below a temperature which is 50.degree. C. higher
than the saturation temperature of the gas composition. More
preferably the syngas is cooled to below a temperature which is
20.degree. C. higher than the saturation temperature of the gas
composition.
[0023] FIG. 1 shows a vessel 1 comprising a syngas collection
chamber 2 and a quench chamber 3. In use it is vertically oriented
as shown in the Figure. References to vertical, horizontal, top,
bottom, lower and upper relate to this orientation. Said terms are
used to help better understand the invention but are by no means
intended to limit the scope of the claims to a vessel having said
orientation. The syngas collection chamber 2 has a syngas outlet 4,
which is fluidly connected with the quench chamber 3 via a tubular
diptube 5. The syngas collection chamber 2 and the diptube 5 have a
smaller diameter than the vessel 1 resulting in an upper annular
space 2a between said chamber 2 the wall of vessel 1 and a lower
annular space 2b between the diptube 5 and the wall of vessel 1.
Annular space 2a and 2b are preferably gas tight separated by
sealing 2c to avoid ingress of ash particles from space 2b into
space 2a.
[0024] The syngas outlet 4 comprises a tubular part 6 having a
diameter, which is smaller than the diameter of the tubular diptube
5. The tubular part 6 is oriented co-axial with the diptube 5 as
shown in the Figure. The vessel 1 as shown in FIG. 1 is at its
upper end provided with a syngas inlet 7 and a connecting duct 8
provided with a passage 10 for syngas. The passage for syngas is
defined by walls 9. Connecting duct 8 is preferably connected to a
gasification reactor as described in more detail in
WO-A-2007125046.
[0025] The diptube 5 is open to the interior of the vessel 1 at its
lower end 10. This lower end 10 is located away from the syngas
collection chamber 2 and in fluid communication with a gas outlet
11 as present in the vessel wall 12. The diptube is partially
submerged in a water bath 13. Around the lower end of the diptube 5
a draft tube 14 is present to direct the syngas upwardly in the
annular space 16 formed between draft tube 14 and diptube 5. At the
upper discharge end of the annular space 16 deflector plate 16a is
present to provide a rough separation between entrained water
droplets and the quenched syngas. Deflector plate 16a preferably
extends from the outer wall of the diptube 5. The lower part 5b of
the diptube 5 has a smaller diameter than the upper part 5a as
shown in FIG. 1. This is advantageous because the layer of water in
the lower end will increase and because the annular area for the
water bath 13 will increase. This is advantageous because it
enables one to use a more optimized, smaller, diameter for vessel
1. The quench zone 3 is further provided with an outlet 15 for
water containing for example fly-ash.
[0026] The tubular part 6 is preferably formed by an arrangement of
interconnected parallel arranged tubes resulting in a substantially
gas-tight tubular wall running from a cooling water distributor to
a header. The cooling of tubular part 6 can be performed by either
sub-cooled water or boiling water.
[0027] The walls of the syngas collection chamber 2 preferably
comprise an arrangement of interconnected parallel arranged tubes
resulting in a substantially gas-tight wall running from a
distributor to a header, said distributor provided with a cooling
water supply conduit and said header provided with a discharge
conduit for water or steam. The walls of the diptube are preferably
of a simpler design, like for example a metal plate wall.
[0028] At the end of the diptube 5 which is nearest to the syngas
collection chamber 2 a discharge conduit 19 is preferably present
having an outflow opening for liquid water directed such that, in
use, a film of water is achieved along the inner wall of the
diptube. Discharge conduit 19 is connected to water supply conduit
17. Discharge conduit 19 will be described in detail by means of
FIGS. 2 and 3.
[0029] FIG. 1 also shows preferred water spray nozzles 18 located
in the diptube 5 to spray droplets of water into the syngas as it
flows downwardly through the diptube 5. The nozzles 18 are
preferably sufficiently spaced away in a vertical direction from
the discharge conduit 19 to ensure that any non-evaporated water
droplets as sprayed into the flow of syngas will contact a wetted
wall of the diptube 5. Applicants have found that if such droplets
would hit a non-wetted wall ash may deposit, thereby forming a very
difficult to remove layer of fouling. It is preferred that the
nozzles 18 are positioned in the larger diameter part 5a of the
dipleg 5. More residence time is achieved by the larger diameter
resulting in that the water as injected has sufficient time to
evaporate.
[0030] FIG. 2 shows detail A of FIG. 1.
[0031] FIG. 2 shows that the tubular part 6 terminates at a point
within the space enclosed by the diptube 5 such that an annular
space 20 is formed between the tubular part 6 and the diptube 5. In
the annular space 20 a discharge conduit 19 for a liquid water is
present having a discharge opening 21 located such to direct the
liquid water 22 along the inner wall of the diptube 5. Conduit 19
and tubular part 6 are preferably not fixed to each other and more
preferably horizontally spaced away from each other. This is
advantageous because this allows both parts to move relative to
each other. This avoids, when the vessel is used, thermal stress as
both parts will typically have a different thermal expansion. The
gap 19a as formed between conduit 19 and part 6 will allow gas to
flow from the syngas collection chamber 2 to the space 2a between
the wall of the chamber 2 and the wall of vessel 1. This is
advantageous because it results in pressure equalization between
said two spaces. The discharge conduit 19 preferably runs in a
closed circle along the periphery of the tubular part 6 and has a
slit like opening 21 as the discharge opening located at the point
where the discharge conduit 19 and the inner wall of the diptube 5
meet. In use, liquid water 22 will then be discharged along the
entire inner circumference of the wall of the diptube 5. As shown
conduit 19 does not have discharge openings to direct water into
the flow of syngas, which is discharged via syngas outlet 4.
[0032] FIG. 2 also shows that the discharge conduit 19 is suitably
fluidly connected to a circular supply conduit 23. Said supply
conduit 23 runs along the periphery of the discharge conduit 19.
Both conduits 19 and 23 are fluidly connected by numerous openings
24 along said periphery. Alternatively, not shown in FIGS. 2 and 3,
is an embodiment wherein the discharge conduit 19 is directly
fluidly connected to one or more supply lines 17 for liquid water
under an angle with the radius of the closed circle, such that in
use a flow of liquid water results in the supply conduit.
[0033] Preferably the discharge conduit 19 or conduit 23 are
connected to a vent. This vent is intended to remove gas, which may
accumulate in said conduits. The ventline is preferably routed
internally in the vessel 1 through the sealing 2c to be fluidly
connected to annular space 2b. The lower pressure in said space 2b
forms the driving force for the vent. The size of the vent line,
for example by sizing an orifice in said ventline, is chosen such
that a minimum required flow is allowed, possibly also carrying a
small amount of water together with the vented gas into the annular
space 2b. Preferably conduit 19 is provided with a vent as shown in
FIG. 2, wherein the discharge conduit 19 has an extending part 26
located away from the discharge opening 21, which extending part 26
is fluidly connected to a vent conduit 27.
[0034] The circular supply conduit 23 of FIG. 3 is suitably fluidly
connected to one or more supply lines 17 for liquid water under an
angle .alpha., such that in use a flow of liquid water results in
the supply conduit 23. Angle .alpha. is preferably between 0 and
45.degree., more preferably between 0 and 15.degree.. The number of
supply lines 17 may be at least 2. The maximum number will depend
on the dimensions of for example the conduit 23. The separate
supply lines 17 may be combined upstream and within the vessel 1 to
limit the number of openings in the wall of vessel 1. The discharge
end of supply line 17 is preferably provided with a nozzle to
increase the velocity of the liquid water as it enters the supply
conduit 23. This will increase the speed and turbulence of the
water as it flows in conduit 23, thereby avoiding solids to
accumulate and form deposits. The nozzle itself may be an easy to
replace part having a smaller outflow diameter than the diameter of
the supply line 17.
[0035] The openings 24 preferably have an orientation under an
angle .beta. with the radius 25 of the closed circle, such that in
use a flow of liquid water results in the discharge conduit 19
having the same direction has the flow in the supply conduit 23.
Angle .beta. is preferably between 45 and 90.degree..
[0036] FIG. 3 also shows tubular part 6 as an arrangement of
interconnected parallel arranged tubes 28 resulting in a
substantially gas-tight tubular wall 29.
[0037] FIG. 4 shows a vessel 30 according to the invention wherein
the syngas collection chamber 2 is a reaction chamber 31 provided
with 4 horizontally firing burners 32. The number of burners may
suitably be from 1 to 8 burners. To said burners the carbonaceous
feedstock and an oxygen containing gas are provided via conduits
32a and 32b. The wall 33 of the reaction chamber 31 is preferably
an arrangement of interconnected parallel arranged tubes 34
resulting in a substantially gas-tight tubular wall. Only part of
the tubes are drawn in FIG. 4. The tubes 34 run from a lower
arranged cooling water distributor 37 to a higher arranged header
38. The burners 32 are arranged in FIG. 4 as described in for
example WO-A-2008110592, which publication is incorporated by
reference. The burners or burner may alternatively be directed
downwardly as for example described in WO-A-2008065184 or in
US-A-2007079554. In use a layer of liquid slag will be present on
the interior of wall 33. This slag will flow downwards and will be
discharged from the reactor via outlet 15.
[0038] The reference numbers in FIG. 4, which are also used in
FIGS. 1-3, relate to features having the same functionality. Detail
A in FIG. 4 refers to FIGS. 2 and 3.
[0039] The syngas outlet 4 consists of a frusto-conical part 35
starting from the lower end of the tubular wall 33 and converging
to an opening 36. Preferably part 35 has a tubular part 35a
connected to the outlet opening of said part 35 to guide slag
downwards into the diptube 5. This is advantageous because one then
avoids slag particles to foul the discharge conduit 19. If such a
tubular part 35a would not be present small slag particles may be
carried to the conduit 19 by recirculating gas. By having a tubular
part of sufficient length such recirculation in the region of
conduit 19 is avoided. Preferably the length of 35a is such that
the lower end terminates at or below the discharge conduit 19. Even
more preferably the lower end terminates below the discharge
conduit 19, wherein at least half of the vertical length of the
tubular part 35a extends below discharge conduit 19.
[0040] The frusto-conical part 35 and the optional tubular part 35a
and 35b comprise one or more conduits, through which in use boiling
cooling water or sub-cooled cooling water, flows. The design of the
conduits of parts 35, 35a and 35b may vary and may be for example
spirally formed, parallel formed, comprising multiple U-turns or
combinations. The parts 35, 35a and 35b may even have separate
cooling water supply and discharge systems. Preferably the
temperature of the used cooling water or steam make of these parts
35 and 35a are measured to predict the thickness of the local slag
layer on these parts. This is especially advantageous if the
gasification process is run at temperatures, which would be
beneficial for creating a sufficiently thick slag layer for a
specific feedstock, such as low ash containing feedstocks like
certain biomass feeds and tar sand residues. Or in situations where
a coal feedstock comprises components that have a high melting
point. The danger of such an operation is that outlet 4 may be
blocked by accumulating slag. By measuring the temperature of the
cooling water or the steam make one can predict when such a slag
accumulation occurs and adjust the process conditions to avoid such
a blockage. The invention is thus also directed to a process to
avoid slag blockage at the outlet of the reaction chamber in a
reactor as illustrated by FIG. 4 by measuring the temperature of
the cooling water or the steam make of these parts 35 and 35a in
order to predict when a slag blockage could occur and adjust the
process conditions to avoid such a blockage. Typically a decrease
in temperature of the used cooling water or a decrease in steam
make are indicative of a growing layer of slag. The process is
typically adjusted by increasing the gasification temperature in
the reaction chamber such that the slag will become more fluid and
consequently a reduction in thickness of the slag layer on parts 35
and 35a will result. The supply and discharge conduits for this
cooling water are not shown in FIG. 4.
[0041] The frusto-conical part 35 is connected to the tubular part
6 near its lower end. Opening 36 has a smaller diameter than the
diameter of the tubular part 6 such that liquid slag will less
easily hit the wall of the tubular part 6 and or of the diptube 5
when it drops down into the water bath 13 and solidifies. In water
bath 13 the solidified slag particles are guided by means of an
inverted frusto-conical part 39 to outlet 15.
[0042] In FIG. 4a a preferred embodiment for tubular part 35a is
shown, wherein the lower end of tubular part 35a is fixed by a
plane 35b extending to the lower end of the next tubular part 6.
This design is advantageous because less stagnant zones are present
where solid ash particles can accumulate.
* * * * *