U.S. patent application number 12/221940 was filed with the patent office on 2009-02-12 for coating the crude gas tract of a fly-stream gasification plant with a heat-resistant anti-stick layer.
This patent application is currently assigned to SIEMENS AKTIENGESELLSCHAFT. Invention is credited to Dietmar Adler, Norbert Fischer, Frank Hannemann.
Application Number | 20090038223 12/221940 |
Document ID | / |
Family ID | 40279353 |
Filed Date | 2009-02-12 |
United States Patent
Application |
20090038223 |
Kind Code |
A1 |
Adler; Dietmar ; et
al. |
February 12, 2009 |
Coating the crude gas tract of a fly-stream gasification plant with
a heat-resistant anti-stick layer
Abstract
A fly-stream gasification device for a process that employs
powdery or liquid fuels--where liquid fuels are to be understood as
oils, or oils containing solids, and water or oil suspensions
containing fuels ground to the consistency of dust or inorganic
additives--at pressures of between ambient pressure and 8 MPa and
gasification temperatures of between 1,200 and 1,900.degree. C.,
and which has a gasification means containing free oxygen,
comprising a gasification chamber, a quenching device, and an
element that belongs to the crude gas tract and ducts the crude
gas, is embodied in such a way that an element ducting crude gas is
made of heat-resistant carbon steel and furnished on surfaces in
contact with the crude gas with an anti-stick layer able to
withstand a temperature of 250.degree. C. for preventing the
carbonates that form from sticking.
Inventors: |
Adler; Dietmar; (Siebenlehn,
DE) ; Fischer; Norbert; (Lichtenberg, DE) ;
Hannemann; Frank; (Buckendorf, DE) |
Correspondence
Address: |
SIEMENS CORPORATION;INTELLECTUAL PROPERTY DEPARTMENT
170 WOOD AVENUE SOUTH
ISELIN
NJ
08830
US
|
Assignee: |
SIEMENS AKTIENGESELLSCHAFT
|
Family ID: |
40279353 |
Appl. No.: |
12/221940 |
Filed: |
August 7, 2008 |
Current U.S.
Class: |
48/75 |
Current CPC
Class: |
C10J 3/485 20130101;
C10J 3/845 20130101; C10J 2300/1634 20130101; C10J 2200/09
20130101; C10J 2300/169 20130101; C10J 2200/152 20130101; C01B
2203/0877 20130101; C10J 3/84 20130101; C01B 2203/025 20130101;
C10K 1/101 20130101; C01B 3/36 20130101 |
Class at
Publication: |
48/75 |
International
Class: |
C10J 3/20 20060101
C10J003/20 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 10, 2007 |
DE |
10 2007 037 860.4 |
Claims
1.-8. (canceled)
9. A fly-stream gasification device for use with powder or liquid
fuels at pressures between ambient pressure and 8 MPa and
gasification temperatures of between 1,200 and 1,900.degree. C.,
and has a free oxygen gasification, comprising: a gasification
chamber; a quenching device; and an element ducting the crude gas
that belongs to a crude gas tract, wherein the quenching process
operates at a pH value of >6.5 and the element ducting crude gas
is made substantially of heat-resistant carbon steel and furnished
on surfaces in contact with the crude gas with an anti-stick layer
capable of withstanding a temperature of 250.degree. C. for
preventing the carbonates that form from sticking.
10. The fly-stream gasification device as claimed in claim 9,
wherein liquid fuels are selected from the group consisting of:
oils, oils containing solids, water suspensions containing fuels
ground to the consistency of dust or inorganic additives and oil
suspensions containing fuels ground to the consistency of dust or
inorganic additives.
11. The fly-stream gasification device as claimed in claim 9,
wherein the element ducting the crude gas is a pipeline.
12. The fly-stream gasification device as claimed in claim 9,
wherein the element ducting the crude gas is a washer.
13. The fly-stream gasification device as claimed in claim 9,
wherein the element ducting the crude gas is a Venturi tube.
14. The fly-stream gasification device as claimed in claim 13,
wherein the anti-stick layer is chemical nickel.
15. The fly-stream gasification device as claimed in claim 13,
wherein the anti-stick layer is chemical nickel PTFE.
16. The fly-stream gasification device as claimed in claim 13,
wherein the anti-stick layer is a fluoropolymer coating.
17. The fly-stream gasification device as claimed in claim 13,
wherein the anti-stick layer is an enamel.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application claims the benefits of German application
No. 10 2007 037 860.4 filed Aug. 10, 2007 and is incorporated by
reference herein in its entirety.
FIELD OF INVENTION
[0002] The present application relates to a fly-stream gasification
device for a process that employs powdery or liquid fuels--where
liquid fuels are to be understood as oils, or oils containing
solids, and water or oil suspensions containing fuels ground to the
consistency of dust or inorganic additives--at pressures of between
ambient pressure and 8 MPa and gasification temperatures of between
1,200 and 1,900.degree. C., and which has a gasification means
containing free oxygen, having the features of the preamble of
claim 1.
BACKGROUND OF THE INVENTION
[0003] During the gasification process with full quenching at
working pressures of up to 8 MPa (80 bar) the hot crude gas
streaming saturated with water vapor from the reactor/quencher (1)
is subjected at a further process stage to gas purification through
water washing. Carbonate precipitations form on the pipeline wall
and washers in the connecting pipeline (2) from the quencher to the
washers (3, 5), in the washers themselves, and in the pipeline (4)
from the first to the second washer. The carbonate formation is due
to the occurrence of alkali metals in the ash of the material being
gasified (coal, slurry, or biomass) and hence to their presence in
the crude gas as well as to the carbon dioxide as a crude gas
constituent.
[0004] Particularly in the washers (3, 5), and therein especially
when a Venturi washer is used, the precipitations cause narrowing
of the Venturi throat's cross-section, which effect, owing to the
consequent increased loss of pressure, reduces the plant's
performance to the point where the gasification process has to be
halted for cleaning.
[0005] The chemical process of carbonate formation will be lessened
or, if a suitably acidic mode of operation is used, prevented
through operating the quenching process at a pH value of <6.5.
However, the consequence of employing the acidic mode is that the
preferred use of economical heat-resistant carbon steels is not
possible owing to the acid corrosion occurring with high rates of
material removal. Acid-resistant and hence expensive materials have
to be used instead.
SUMMARY OF INVENTION
[0006] The object underlying the invention is to embody a
fly-stream gasification device in such a way that the quenching
process can be operated at a pH value of >6.5 without the
downtimes for cleaning for which provision customarily has to be
made.
[0007] Said object is achieved in the case of a subject matter
outlined by the features of the claims.
[0008] According to the invention, the washers (3, 5), specifically
the Venturi tube, and the connecting pipelines (2, 4) are coated
with a temperature-resistant anti-stick layer. Chemical nickel,
chemical nickel PTFE, coating with a fluoropolymer, and special
enamel may be cited by way of example. The coating prevents the
carbonates that form from sticking.
[0009] Preventing precipitations by means of the surface coating
furnishes the prerequisite for being able to operate the quenching
process at a pH value of >6.5. That in turn offers the advantage
that economical heat-resistant carbon steels can be used as the
material for producing the washers (3, 5) and pipelines (2, 4).
[0010] Advantageous developments of the subject matter of the
application are set forth in the dependent claims.
BRIEF DESCRIPTION OF THE DRAWINGS
[0011] The invention is explained in more detail below to an extent
necessary for understanding by way of an exemplary embodiment and
with reference to a figure, in which:
[0012] FIG. 1 shows a gasification device with fill quenching.
DETAILED DESCRIPTION OF INVENTION
[0013] Fuel and oxygen/vapor are ducted to a fly-stream
gasification reactor at the top where the fuel is partially
oxidized in a flame reaction at pressures between ambient pressure
and high pressures of 80 bar (8 MPa) and at temperatures of between
1,200 and 1,900.degree. C. Powdery or liquid fuels can be used as
the fuel, with liquid fuels to be understood as oils, or oils
containing solids, and water or oil suspensions containing fuels
ground to the consistency of dust or inorganic additives.
[0014] The hot gasification gas exits the gasification chamber
together with the liquid slag, then via the crude gas and slag exit
enters the quench chamber into which water for cooling the crude
gas and slag is jetted via quench nozzles. The slag is deposited at
the bottom of the water bath and ducted away via a slag extractor.
The quenched crude gas exits the quench chamber saturated with
water vapor and at a temperature of 200.degree. C. via the pipeline
2.
[0015] The crude gas is passed on via the crude gas tract that is
formed by means of various elements such as, for instance, the
pipeline 2 from the quencher to the washer 3, the pipeline 4 from
the washer 3 to the washer 5, the washer 5 itself, and, if a
Venturi washer is used, the Venturi throat. According to the
invention, at least one element ducting crude gas, several or all
crude gas elements ducting crude gas is/are made substantially of
heat-resistant carbon steel as the material and furnished on
surfaces in contact with the crude gas with an anti-stick layer
able to withstand a temperature of 250.degree. C. for preventing
the carbonates that form from sticking.
* * * * *