EP3491107A1 - Cooling screen with variable pipe diameter for high gasifier power - Google Patents
Cooling screen with variable pipe diameter for high gasifier powerInfo
- Publication number
- EP3491107A1 EP3491107A1 EP17761062.3A EP17761062A EP3491107A1 EP 3491107 A1 EP3491107 A1 EP 3491107A1 EP 17761062 A EP17761062 A EP 17761062A EP 3491107 A1 EP3491107 A1 EP 3491107A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cooling screen
- cooling
- screen
- walled
- tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/72—Other features
- C10J3/74—Construction of shells or jackets
- C10J3/76—Water jackets; Steam boiler-jackets
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/46—Gasification of granular or pulverulent flues in suspension
- C10J3/48—Apparatus; Plants
- C10J3/485—Entrained flow gasifiers
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/72—Other features
- C10J3/82—Gas withdrawal means
- C10J3/84—Gas withdrawal means with means for removing dust or tar from the gas
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2200/00—Details of gasification apparatus
- C10J2200/09—Mechanical details of gasifiers not otherwise provided for, e.g. sealing means
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0953—Gasifying agents
- C10J2300/0959—Oxygen
Definitions
- the invention relates to an entrained flow gasifier for the gasification of solid and liquid fuels at temperatures between 1,200 and 1,900 ° C and pressures between ambient pressure and 10 MPa (100 bar), wherein solid fuels dusty ground coal coals different degrees of coalification, Pet- coke or other solid carbonaceous materials and liquid fuels, oils or oil-solid or water-solid suspensions, with a free oxygen-containing oxidant, in which a cooling jacket 8 arranged in a pressure jacket 15 delimits a reaction space 9.
- the thermally highly loaded reaction space 9 is formed by a cooled pipe construction. This construction, the so-called cooling screen 8, as
- the cooling screen 8 is positioned in a pressure vessel 15. For reasons of thermal stability of the pressure vessel, a certain distance between the pressure vessel and the cooling screen is necessary.
- the thus resulting back space 10 (also referred to as a cooling screen gap) is purged with an inert gas and has to the reaction space on a pressure equalization, which in normal operation in the reaction chamber and in the back chamber equal pressure prevails.
- the cooling screen as a whole must have a certain minimum resistance to pressure differences across its wall. This minimum resistance to pressure differences increases With increasing cooling screen diameter and cooling screen height, so that increases with increasing carburetor this problem.
- the cooling screen is exposed to a high thermal load and to avoid damage, a good heat transfer from the reaction space in the cooling water is required. This requirement can be achieved by low pipe wall thicknesses, which in turn counteracts the differential pressure resistance of the cooling screen.
- Prior art are carburetor sizes of 500 MW, as described for example in DE 197 181 31 AI.
- a cooling screen consisting of gastight welded cooling tubes within a pressure vessel.
- This cooling screen is supported on an intermediate floor and can expand freely upwards. This ensures that when various temperatures occur due to startup and shutdown processes and the resulting change in length no mechanical stresses occur, which could possibly lead to destruction.
- there is no fixed connection at the upper end of the cooling screen but an annular gap between the cooling screen collar and the burner mounting flange, which ensures free mobility and is filled with elastic, thermally resistant fiber mats.
- mats are not gas-tight and thus allow a backflow of the cooling screen gap with a dry, condensate-free and oxygen-free gas. This flushing is intended to prevent a backflow of hot gasification gas in the event of pressure fluctuations in the cooling screen gap.
- a disadvantage of this design is that these mats are only positively positioned in the annular gap and can be pushed out of the guide at greater differential pressures. In this way, the mats no longer fulfill their function of limiting the transfer of dust from the reaction space into the rear space, which ultimately leads to reaction gas and dust entering the cooling screen gap 10, despite opposing flushing.
- the gap as described in DE10 2007 045 321 and DE10 2009 005 856, can be closed by means of a corrugated tube compensator.
- the purge gas is passed from the cooling screen gap 10 via an additional pressure equalization line connected to the combination burner into the reaction space so as to ensure the necessary pressure equalization between the cooling screen gap and the reaction space. Disadvantages of this solution are the high price of compensators with a larger diameter and the additional piping effort for the pressure compensation line.
- the cooling screen concept described in DE 197 181 31 requires a sufficient layer of liquid and solid slag on the cooling screen.
- this slag layer can form a different thickness depending on the coal used or its ash.
- the heat input and the amount of heat to be dissipated in the cooling screen can rise sharply and lead to wall temperatures above the permissible material values and greater thermal wear.
- the range of application and the performance of the cooling screen are limited due to the opposite effect of a changed pipe wall thickness on strength of the cooling screen versus dissipated amount of heat.
- the invention is based on the problem to provide a technical solution to the mentioned, conflicting requirements.
- the invention makes use of the knowledge that the temperature release can be adjusted by a corresponding burner design so that a lower thermal load in the conical regions of the cooling screen can be realized.
- the solution to the problem of the invention lies in a cooling screen design with sufficient strength at high pressure difference across the cooling screen wall and a tube wall thickness, which ensures safe operation of the cooling screen and a high heat transfer;
- a pressure equalization between the cooling screen gap 10 and the reaction chamber 9 is given in all operating conditions.
- Figure 1 shows an inventive 8-speed cooling screen with 4 evenly distributed over the circumference claws and
- Figure 2 shows an embodiment of the invention with 8 support plates and 32 distributed to this rinsing and pressure equalization tubes.
- like names denote like elements.
- thin-walled tubes 5 are used in the region of the highest temperature load, that is to say in the cylindrical part of the cooling screen, and ensure mechanical strength in the conical regions of the cooling screen (top and bottom), in particular for absorbing the bending moments due to dead load and differential pressures occurring.
- thick-walled tubes 3 used.
- the tubes are further selected so that the pipe outside diameter is kept constant over the entire cooling screen height 8 and the pipe wall thickness is varied only over the pipe inner diameter.
- the transition from the smaller inner diameter to the larger inner diameter of the pipe is thereby made slidably over a gradual increase in diameter 4 in order to avoid the formation of "dead water zones" in which sufficient cooling can not be ensured due to discontinuous flow conditions.
- manufacturing advantages for example, automatic welding
- the thus ensured uniform Bestampfampfiana with refractory material is advantageous.
- the mechanical load of the cooling screen is increased by zen 1 in the enclosing pressure jacket 15 derived, which further reduces the bending moments and thus increases the permissible pressure difference in principle.
- the provided claws 1 simultaneously cause local voltage peaks.
- the described wall thickness transitions 4 are positioned as far as possible far outside the interference region of the claws (area in which local stress peaks may occur due to the claws in the presence of mechanical stress).
- the wall thickness transitions 4 While maintaining a possible large area of thinner wall thicknesses 5, the wall thickness transitions 4 are arranged vertically above the claws and tangentially viewed centrally between the claws 1. With a symmetrical number of claws, the following formula for the horizontal arrangement of the wall thickness transitions can be used to position the wall thickness transitions 4 in the lower cylindrical area:
- Symmetric design means that between the claws always the same number of wall thickness transitions is arranged, that is, k is an integer number.
- the vertical distance x between the claw and the first wall thickness transition is chosen such that between the upper tube connected to the claw and the tube with wall cladding Strength transition is at least one other pipe with a large wall thickness.
- the claw is advantageously designed such that at least three tubes in the conical region and three tubes in the cylindrical part are firmly connected to each claw. With an additional attachment of the claw to the upper tubes of the lower conical cooling screen part, the load bearing of the cooling screen can be made particularly advantageous.
- a further increase in the cooling screen resistance is possible by optimizing the upper and lower conical cooling screen part associated with an increase in the angle of attack 16.
- this increase in the angle of attack leads to an enlargement of the cooling screen gap 10
- the amount of gas to be removed increases at the instantaneous voltage of the reactor 9.
- An increased amount of gas in turn increases at constant
- Purge and pressure equalization lines 13 the differential pressure across the cooling screen and counteracts an increase in strength by a larger angle of attack. Therefore, in an advantageous embodiment, an angle 16 is selected between 35 ° and 60 °. In the embodiment of FIG. 2, this angle 16 is selected at 45 °.
- Figure 1 shows an embodiment with eight cooling screen tubes (8-speed cooling screen) and 4 evenly distributed over the circumference claws.
- the vertical distance was selected with four pipe diameters and the horizontal distance of 22.5 °.
- the allowable differential pressure for carburettors of greater power is less than for smaller carburetor powers up to, for example, 500 MW, so further action is necessary be to ensure safe operation without accumulation of coal dust in the cooling screen gap or corrosion of the pressure vessel 15 and the back of the cooling screen 8.
- metal rinsing and pressure equalization tubes 12 are positioned in the expansion gap of the cooling screen so that on the one hand, the allowable pressure difference across the cooling screen is not exceeded and on the other hand, the vertical thermal expansion of the cooling screen is guaranteed.
- the necessary gap remaining for expansion is filled with flexible, thermally stable ceramic fiber mats 11 in order to prevent the passage of dust.
- support plates 13 are positioned at the upper end of the cooling screen, the number of these support plates being selected to correspond to the number of the cooling screen tubes.
- the metallic tubes 12 are evenly distributed and sealed the remaining annular space between thedepressab gleich and pressure vessel by means of fiber mats 11, which are advantageously arranged above the tubes.
- FIG. 2 shows an exemplary embodiment with eight support plates and 32 rinsing and pressure equalizing tubes distributed on these.
- the invention is also provided by a reactor for the metering of solid and liquid fuels in the air stream at temperatures between 1200 and 1900 ° C and pressures between ambient pressure and 10 MPa (100 bar), with solid fuels dusty milled coal different Kohlohlungs- grades, petroleum cokes or other solid carbonaceous substances and may be liquid fuels, oils or oil solids or water-solid suspensions, with a free oxygen-containing oxidant, the reactor having a cooling screen 8 and a pressure jacket 15, wherein in a pressure jacket 15th a cooling screen 8 delimits a reaction space 9, the cooling screen is embodied with several parallel wound pipes through which a cooling liquid flows, the cooling screen pipes have wall thickness changes with a thicker wall thickness in the lower and upper area and a thinner wall thickness in the central cylindrical area and the angle of incidence of conicaldecan Schemees an angle 16 of 35 ° to 60 °.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102016216453.8A DE102016216453A1 (en) | 2016-08-31 | 2016-08-31 | Cooling screen with variable tube diameter for high carburetor performance |
PCT/EP2017/071574 WO2018041791A1 (en) | 2016-08-31 | 2017-08-28 | Cooling screen with variable pipe diameter for high gasifier power |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3491107A1 true EP3491107A1 (en) | 2019-06-05 |
EP3491107B1 EP3491107B1 (en) | 2020-07-29 |
Family
ID=59745903
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17761062.3A Active EP3491107B1 (en) | 2016-08-31 | 2017-08-28 | Cooling screen with variable pipe diameter for high gasifier power |
Country Status (6)
Country | Link |
---|---|
US (1) | US20190194560A1 (en) |
EP (1) | EP3491107B1 (en) |
CN (1) | CN109642170A (en) |
DE (1) | DE102016216453A1 (en) |
WO (1) | WO2018041791A1 (en) |
ZA (1) | ZA201901315B (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL2026450B1 (en) | 2019-09-11 | 2022-02-21 | Cramwinckel Michiel | Process to convert a waste polymer product to a gaseous product |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DD288614B3 (en) * | 1989-10-18 | 1993-03-25 | Noell Dbi Energie Entsorgung | REACTOR FOR FLOW CURING |
DE4017219A1 (en) * | 1990-05-29 | 1991-12-05 | Babcock Werke Ag | DEVICE FOR GASIFYING CARBONATED MATERIALS |
DE19718131C2 (en) | 1997-04-29 | 1999-10-14 | Krc Umwelttechnik Gmbh | Method and device for the regeneration of a liquid obtained in the power process for the digestion of wood by gasification |
DE202007018720U1 (en) * | 2007-09-21 | 2009-03-05 | Siemens Aktiengesellschaft | Air flow carburetor with cooling screen and sliding seal |
DE202007018721U1 (en) | 2007-09-21 | 2009-04-23 | Siemens Aktiengesellschaft | Air flow carburettor with cooling screen and corrugated tube compensator |
DE102007051077B4 (en) * | 2007-10-25 | 2015-04-09 | Siemens Aktiengesellschaft | Air flow carburettor with cooling screen and inner water jacket |
CN101418237B (en) * | 2008-11-17 | 2012-08-01 | 上海锅炉厂有限公司 | Assembling apparatus of gasifying furnace water-cooling cover and assembly method |
DE102009005856A1 (en) | 2009-01-23 | 2010-07-29 | Siemens Aktiengesellschaft | Device for pressure equalization between the reaction chamber and the cooling screen gap in an air flow gasifier with a firmly welded-in cooling screen |
CN202558822U (en) * | 2012-03-13 | 2012-11-28 | 天津辰创环境工程科技有限责任公司 | Water cooling gasification furnace |
CN202730087U (en) * | 2012-09-05 | 2013-02-13 | 华陆工程科技有限责任公司 | Water cooled wall type water coal slurry gasifier |
CN104327881B (en) * | 2014-10-16 | 2017-01-11 | 煤炭科学技术研究院有限公司 | Liquid continuous slag-removal fixed bed gasification furnace and gasification method thereof |
CN204400930U (en) * | 2014-12-18 | 2015-06-17 | 广东正鹏生物质能源科技有限公司 | A kind of cooling structure of biomass gasifying furnace secondary air |
-
2016
- 2016-08-31 DE DE102016216453.8A patent/DE102016216453A1/en not_active Withdrawn
-
2017
- 2017-08-28 CN CN201780053072.4A patent/CN109642170A/en active Pending
- 2017-08-28 EP EP17761062.3A patent/EP3491107B1/en active Active
- 2017-08-28 US US16/327,845 patent/US20190194560A1/en not_active Abandoned
- 2017-08-28 WO PCT/EP2017/071574 patent/WO2018041791A1/en unknown
-
2019
- 2019-03-01 ZA ZA2019/01315A patent/ZA201901315B/en unknown
Also Published As
Publication number | Publication date |
---|---|
EP3491107B1 (en) | 2020-07-29 |
US20190194560A1 (en) | 2019-06-27 |
ZA201901315B (en) | 2019-12-18 |
WO2018041791A1 (en) | 2018-03-08 |
CN109642170A (en) | 2019-04-16 |
DE102016216453A1 (en) | 2018-03-01 |
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