CN101696361A - High-pressure powdered coal gasifier with back-heating system - Google Patents
High-pressure powdered coal gasifier with back-heating system Download PDFInfo
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- CN101696361A CN101696361A CN200910198002A CN200910198002A CN101696361A CN 101696361 A CN101696361 A CN 101696361A CN 200910198002 A CN200910198002 A CN 200910198002A CN 200910198002 A CN200910198002 A CN 200910198002A CN 101696361 A CN101696361 A CN 101696361A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
- Y02E20/18—Integrated gasification combined cycle [IGCC], e.g. combined with carbon capture and storage [CCS]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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Abstract
The invention provides a high-pressure powdered coal gasifier with a back-heating system, which is characterized in that the gasifier comprises a water-cooling high-pressure powdered coal gasifying chamber; the water-cooling high-pressure powdered coal gasifying chamber is connected with a radiant type raw gas cooler with a membrane type water-cooling wall; the radiant type raw gas cooler with the membrane type water-cooling wall is connected with a cooled medium inlet of a first level back-heating device; a cooled medium outlet of the first level back-heating device is connected with a cooled medium inlet of a second level back-heating device; a cooled medium outlet of the second level back-heating device is connected with a dust collector; the dust collector is connected with desulfurization denitrification purification equipment; and the desulfurization denitrification purification equipment is connected with the cooled medium inlet of the second level back-heating device. The gasifier has the advantage of higher energy utilizing efficiency.
Description
Technical field
The present invention relates to a kind of gasification of high-pressure pulverized coal stove that has heat regenerative system, belong to the gasification of coal apparatus field.
Background technology
The eighties in last century, air flow bed pressurized gasification technology emerged in the world, showed good technical feature and Environmental indicators, thereby became one of generally acknowledged in the world coal high-efficiency, clean utilization technology.The common feature of airflow bed gasification furnace is: gasification temperature up to 1300 ℃ about, the residence time of reactant in stove is shorter, can obtain satisfied efficiency of carbon conversion and gasification efficiency, but the sensible heat taken away of outlet coal gas increases, and reduced the thermo-efficiency of air flow bed.
Present gasification technology is also failed fine solution vapourizing furnace outlet coal gas high-temperature sensible heat utilization, has limited the raising of existing gasification technology overall thermal efficiency.For example typical Shell stove and Texaco stove, the sensible heat that the Shell producer gas is taken away accounts for into 13% of producer gas calorific value, and the Texaco stove accounted for for 20% (not containing latent heat).Though these sensible heats can be partially recovered generation steam in the useless pot of back, the efficient of cooled coal gas will reduce by 13%～20%, and this is the lower major cause of cold gas efficiency.
Shell and Prenflo vapourizing furnace are the gasification installation with the charging of dry coal powder form, has only the one-level gasification reaction, in order to allow the molten state lime-ash in the coal gas of high temperature solidify in order to avoid gas cooler is stopped up, have to adopt cooled coal gas a large amount of in the subsequent technique that coal gas of high temperature is carried out chilling, can make coal gas of high temperature be cooled to 900 ℃ by 1400 ℃, its available energy loss is very big, and indexs such as the cold gas efficiency of vapourizing furnace and overall thermal efficiency are all lower.
Texaco adopts radiation waste-heat boiler to enter convection recuperator after gas temperature being brought down below 900 ℃ temperature, no matter be the water wall or the contraflow cooler of waste heat boiler, how with water as cooling working medium, therefore follow-up coal gas further being utilized has big obstacle, has limited the raising of whole efficiency of energy utilization.
In sum, in the coal gasifier flow process, the recovery of sensible heat of raw gas is a very important problem, and it has influence on the integrated heat efficiency of coal gasifier and energy utility system thereof.Existing coal gasifier sensible heat of raw gas reclaims the general radiant cooler that adopts and adds contraflow cooler, or cooled coal gas recirculation adds contraflow cooler, these two kinds of method of cooling all adopt water coolant as heat-eliminating medium, the available energy loss is very huge, thereby causes the reduction of follow-up energy utilization efficiency.
Summary of the invention
The purpose of this invention is to provide the higher gasification of high-pressure pulverized coal stove of a kind of energy utilization efficiency.
In order to achieve the above object, technical scheme of the present invention provides a kind of gasification of high-pressure pulverized coal stove that has heat regenerative system, it is characterized in that, comprise water-cooled gasification of high-pressure pulverized coal chamber, water-cooled gasification of high-pressure pulverized coal chamber connects the radiation formula raw gas water cooler that has membrane wall, the radiation formula raw gas water cooler that has membrane wall connects the medium import that is cooled of first step regenerative apparatus, the media outlet that is cooled of first step regenerative apparatus connects the medium import that is cooled of second stage regenerative apparatus, the media outlet that is cooled of second stage regenerative apparatus connects fly-ash separator, fly-ash separator connects the desulfurization removing nitric treating plant, and the desulfurization removing nitric treating plant connects the cooling medium inlet of second stage regenerative apparatus.
Further, outlet is connected water-cooled tube respectively to the outlet of the heat-eliminating medium of described second stage regenerative apparatus with heat-eliminating medium for clean coal gas of high temperature outlet, the cooling medium inlet of first step regenerative apparatus.
The heat-eliminating medium outlet of described second stage regenerative apparatus connects the coal gas expansion turbine, and the coal gas expansion turbine connects the cooling medium inlet and the generator of first step regenerative apparatus respectively, and the heat-eliminating medium outlet of first step regenerative apparatus is clean coal gas of high temperature outlet.
The present invention puts the two-stage regenerative apparatus at the raw gas convection current cooling section lining of this vapourizing furnace, the sensible heat of high raw gas is passed to high pressure gas after the purification by recuperative heat exchanger, because the specific heat capacity of the two changes little, therefore can accomplish temperature difference heat transfers such as near, the sensible heat of raw gas is used to promote the heat energy quality of the low temperature coal gas after the purification, thereby reduces the thermo-efficiency of vapourizing furnace energy utility system.For the technology that some coal gas utilize, the gasification of high-pressure pulverized coal stove is still needed with low pressure usefulness gas technology and is wanted pressure to be connected, and between must be provided with the pressure regulating equipment flow process and just can couple together.The present invention also can address this problem.Two-stage regenerative apparatus outlet temperature of gas is not analysed carbon by metal tolerable temperature, heat balance and the assurance coal gas of regenerative apparatus under this temperature principle is determined, all must not be higher than 500 ℃.
Compared with prior art, improvement of the present invention is: 1, can adopt N
2Or CO
2Carrying fine coal is the pressurized gasification mode of charging, as adopting CO
2The pressurized gasification mode of carrying fine coal and be charging is coal gasification efficient height (transformation efficiency of carbon is up to 97%) not only, can adapt to the different coal of grade, calorific value to coal does not especially have strict restriction to the ash fusion point of coal, and the very high (CO+H of the reducing gas purity of producing
2〉=95%) cold gas efficiency height; 2, in the high pressure bearing shell, arrange water wall, adopt radiant cooler to reduce the temperature of high temperature rough gas, can cancel the cooled coal gas recirculation system, and heat exchange is finished by water wall mainly; 3, can adopt the two-stage regenerative apparatus that the sensible heat of raw gas is exchanged to the coal gas after purifying, send into the acting of coal gas turbine after the coal gas heating after the purification, realize the efficient utilization of overbottom pressure and waste heat; 4, can adopt wherein one-level regenerative apparatus, the sensible heat of raw gas is exchanged to the coal gas after purifying, and one-level be used to heat other working medium in addition, helps the layout of vapourizing furnace; 5, the most important thing is, raw gas enters the dust separation system purification be cooled to certain temperature in regenerative apparatus after, the coal gas that temperature after the purification is lower returns the higher raw gas of regenerative apparatus and temperature and carries out heat exchange, make the heat energy quality that purifies back coal gas improve back output, for good condition has been created in the raising of the energy utilization efficiency of follow-up system such as IGCC etc.
Description of drawings
Fig. 1 is a kind of gasification of high-pressure pulverized coal furnace structure synoptic diagram that has heat regenerative system;
Fig. 2 is the another kind of gasification of high-pressure pulverized coal furnace structure synoptic diagram that has heat regenerative system.
Embodiment
Specify the present invention below in conjunction with embodiment.
As shown in Figure 1, be a kind of gasification of high-pressure pulverized coal furnace structure synoptic diagram that has heat regenerative system, described gasification of high-pressure pulverized coal stove is by water-cooled gasification of high-pressure pulverized coal chamber 1, have radiation formula raw gas water cooler 2, first step regenerative apparatus 3, second stage regenerative apparatus 4, fly-ash separator 5, the desulfurization removing nitric treating plant 6 of membrane wall and equipment 9 compositions of slagging tap, coal is by CO
2Carry and enter water-cooled gasification of high-pressure pulverized coal chamber 1, be rich in CO and H with the vaporized chemical oxygen and the water vapour generating gasification reaction generation of input
2High temperature rough gas, the fused lime-ash is discharged from the equipment of slagging tap 9, high temperature rough gas enters the radiation formula raw gas refrigerating unit 2 that is furnished with membrane wall and is cooled to below 900 ℃, enters first step regenerative apparatus 3 again.First step regenerative apparatus 3 is shell and tube convective heat exchange devices, it in the pipe water coolant, pipe is outer to be the raw gas of High Temperature High Pressure, raw gas makes the water coolant in the heat transferred pipe temperature of the water coolant of 5～6MPa become 450 ℃ of steam by 185 ℃ of intensifications in this regenerator, and the raw gas temperature is cooled to 645 ℃ by 900 ℃.Second stage regenerative apparatus 4 is shell and tube convective heat exchange devices, in the pipe purification coal gas of cryogenic high pressure, pipe is outer to be the raw gas of High Temperature High Pressure, raw gas in this regenerator with the cooled coal gas after the purification in the heat transferred pipe, the raw gas temperature is cooled to 250 ℃ by 645 ℃ and enters fly-ash separator 5 and desulfurization removing nitric treating plant 6 again, and cooled coal gas is warmed up to 450 ℃ by 40 ℃ and becomes clean coal gas of high temperature output.
As shown in Figure 2, the gasification of high-pressure pulverized coal furnace structure synoptic diagram that has heat regenerative system for another kind, described gasification of high-pressure pulverized coal stove is by water-cooled gasification of high-pressure pulverized coal chamber 1, have radiation formula raw gas water cooler 2, first step regenerative apparatus 3, second stage regenerative apparatus 4, fly-ash separator 5, desulfurization removing nitric treating plant 6, generator 7, the coal gas expansion turbine 8 of membrane wall and equipment 9 compositions of slagging tap, coal is by CO
2Carry and enter water-cooled gasification of high-pressure pulverized coal chamber 1, be rich in CO and H with the vaporized chemical oxygen and the water vapour generating gasification reaction generation of input
2High temperature rough gas, the fused lime-ash is discharged high temperature rough gas from the equipment of slagging tap 9 and is entered the radiation formula raw gas refrigerating unit 2 that is furnished with membrane wall and be cooled to below 900 ℃, enters first step regenerative apparatus 3 again.First step regenerative apparatus 3 is shell and tube convective heat exchange devices, in the pipe purification coal gas of cryogenic high pressure, pipe is outer to be the raw gas of High Temperature High Pressure, raw gas makes cooled coal gas be warmed up to 450 ℃ by 185 ℃ the cooled coal gas after the purification in the heat transferred pipe in this regenerator, and the raw gas temperature is cooled to 645 ℃ by 900 ℃.Second stage regenerative apparatus 4 is shell and tube convective heat exchange devices, in the pipe purification coal gas of cryogenic high pressure, pipe is outer to be the raw gas of High Temperature High Pressure, raw gas makes cooled coal gas be warmed up to 450 ℃ by 40 ℃ the cooled coal gas after the purification in the heat transferred pipe in this regenerator, and the raw gas temperature is cooled to 250 ℃ by 645 ℃.Between first step regenerative apparatus 3 and the second stage regenerative apparatus 4 coal gas expansion turbine 8 is set, utilizes the pressure energy and the heat energy of clean gas, drive generator 7 generatings.
Claims (3)
1. gasification of high-pressure pulverized coal stove that has heat regenerative system, it is characterized in that, comprise water-cooled gasification of high-pressure pulverized coal chamber (1), water-cooled gasification of high-pressure pulverized coal chamber (1) connects the radiation formula raw gas water cooler (2) that has membrane wall, the radiation formula raw gas water cooler (2) that has membrane wall connects the medium import that is cooled of first step regenerative apparatus (3), the media outlet that is cooled of first step regenerative apparatus (3) connects the medium import that is cooled of second stage regenerative apparatus (4), the media outlet that is cooled of second stage regenerative apparatus (4) connects fly-ash separator (5), fly-ash separator (5) connects desulfurization removing nitric treating plant (6), and desulfurization removing nitric treating plant (6) connects the cooling medium inlet of second stage regenerative apparatus (4).
2. a kind of gasification of high-pressure pulverized coal stove that has heat regenerative system as claimed in claim 1, it is characterized in that, outlet is connected water-cooled tube respectively with heat-eliminating medium for clean coal gas of high temperature outlet, the cooling medium inlet of first step regenerative apparatus (3) in the heat-eliminating medium outlet of described second stage regenerative apparatus (4).
3. a kind of gasification of high-pressure pulverized coal stove that has heat regenerative system as claimed in claim 1, it is characterized in that, the heat-eliminating medium outlet of described second stage regenerative apparatus (4) connects coal gas expansion turbine (8), coal gas expansion turbine (8) connects the cooling medium inlet and the generator (7) of first step regenerative apparatus (3) respectively, and the heat-eliminating medium outlet of first step regenerative apparatus (3) is clean coal gas of high temperature outlet.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101980025A CN101696361B (en) | 2009-10-30 | 2009-10-30 | High-pressure powdered coal gasifier with back-heating system |
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| CN2009101980025A CN101696361B (en) | 2009-10-30 | 2009-10-30 | High-pressure powdered coal gasifier with back-heating system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103045305A (en) * | 2012-12-26 | 2013-04-17 | 崔旷 | Coal gasification device and process for heating coal water slurry |
| CN105670708A (en) * | 2016-03-22 | 2016-06-15 | 胡志阳 | Equipment and method for cooling synthesized gas |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101161792B (en) * | 2007-09-29 | 2010-11-17 | 上海惠生化工工程有限公司 | Heat recovering technique for synthetic gas production process by coal gasification |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103045305A (en) * | 2012-12-26 | 2013-04-17 | 崔旷 | Coal gasification device and process for heating coal water slurry |
| CN105670708A (en) * | 2016-03-22 | 2016-06-15 | 胡志阳 | Equipment and method for cooling synthesized gas |
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