CN207741061U - A kind of coal oven dithio-gas heat recovery system free of discontinuities - Google Patents

A kind of coal oven dithio-gas heat recovery system free of discontinuities Download PDF

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Publication number
CN207741061U
CN207741061U CN201721824021.0U CN201721824021U CN207741061U CN 207741061 U CN207741061 U CN 207741061U CN 201721824021 U CN201721824021 U CN 201721824021U CN 207741061 U CN207741061 U CN 207741061U
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heat exchanger
steam
gas
vapor
output
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付立欣
许桂瑛
金基浩
李桦
蒋富
何玉涛
肖丽
任众
李旭东
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Acre Coking and Refractory Engineering Consulting Corp MCC
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Acre Coking and Refractory Engineering Consulting Corp MCC
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/10Process efficiency
    • Y02P20/129Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines

Abstract

The utility model is related to a kind of coal oven dithio-gas heat recovery systems free of discontinuities, including hot precipitator, waste heat boiler, cryogenic heat exchanger, oxygen-eliminating device, sweet-water tank, heating furnace, reducing-and-cooling plant, steam superheater and decompressor;The utility model uses the heat of waste heat heat boiler high efficiente callback coal oven dithio-gas, and the steam for producing multi-parameter is used for high-voltage power user and low-pressure steam user, and realizes that process system steam inside recycles, and reaches energy saving purpose;Meanwhile it ensureing the operation free of discontinuities of waste heat reclaiming process system and not influencing coke oven safety in production.

Description

A kind of coal oven dithio-gas heat recovery system free of discontinuities
Technical field
The utility model is related to residual heat utilizing technology of coke oven crude gas field more particularly to a kind of coal oven dithio-gas heat without It is interrupted recovery system.
Background technology
Coking process flow is substantially the industrial flow of the train of thought based on carbon stream, therefore solves carbon stream It is energy-saving to be of great significance for optimization coking process flow.Heat expenditure in coke production mainly by it is red it is burnt from 650~750 DEG C of medium temperature waste heats that 950~1050 DEG C of high-temperature residual heats, the coal oven dithio-gas taken out of in coke oven are taken out of, coke oven flue are useless 180~250 DEG C of low temperature exhaust heats and four part of furnace body surface heat loss composition that gas is taken out of.Wherein, coal oven dithio-gas is taken out of 650~750 DEG C of medium temperature waste heats account for the 37% of coke oven heat expenditure, this partial heat of high efficiente callback recycles coal chemical enterprise secondary energy sources Using particularly important, but coal oven dithio-gas ingredient is extremely complex, easily condensation is precipitated and is attached in heat-exchanger rig and graphite occurs Change effect.Currently, mainly recycling waste heat of coke oven crude gas, but recuperation of heat using Ascension Pipe Gasification cooling device, HYWHR technologies etc. Phenomena such as efficiency is low, product category is single, easy generation coke oven coke oven uprising tube leak is to coke furnace carbonization chamber influences coke oven safety in production.
Invention content
The utility model provides a kind of coal oven dithio-gas heat recovery system free of discontinuities, is efficiently returned using waste heat heat boiler The heat for receiving coal oven dithio-gas, the steam for producing multi-parameter is used for high-voltage power user and low-pressure steam user, and realizes work Process system steam inside recycles, and reaches energy saving purpose;Meanwhile ensureing the operation free of discontinuities of waste heat reclaiming process system and not shadow Ring coke oven safety in production.
In order to achieve the above object, the utility model is realized using following technical scheme:
A kind of coal oven dithio-gas heat recovery system free of discontinuities, including hot precipitator, waste heat boiler, cryogenic heat exchanger, Oxygen-eliminating device, sweet-water tank, heating furnace, reducing-and-cooling plant, steam superheater and decompressor;The waste heat boiler by drum and Vapor heat exchanger A, the vapor heat exchanger B connected respectively by tedge, down-comer and drum;The raw coke oven gas of hot precipitator is defeated Enter the gas collecting tube of end connection coke oven, the vapor heat exchanger A in the raw coke oven gas output end connection waste heat boiler of hot precipitator and steaming Vapour heat exchanger B;The demineralized water output end of sweet-water tank pumps the demineralized water input terminal of connection oxygen-eliminating device, oxygen-eliminating device by deaerated feedwater Boiler feedwater input terminal pass through boiler feed pump connect cryogenic heat exchanger boiler feedwater output end, the boiler of cryogenic heat exchanger Water supply input terminal connects drum;The conduction oil output end of the conduction oil input terminal connection heating furnace of cryogenic heat exchanger, low-temperature heat exchange The conduction oil input terminal of the conduction oil output end connection heating furnace of device;The saturated vapor output end of drum connects pressure and temperature reducing simultaneously The desuperheating water input terminal of the saturated vapor input terminal of device and steam superheater, reducing-and-cooling plant connects boiler feedwater pump discharge Pipeline;The low-pressure steam output end of reducing-and-cooling plant connects low-pressure steam user;Steam superheater sets coke dry quenching furnace recyclegas The high pressure superheated steam output end of entrance, steam superheater connects high-voltage power user, the high pressure superheated steam of steam superheater Output end connects vapor heat exchanger A and vapor heat exchanger B by decompressor.
The vapor heat exchanger A sets raw coke oven gas entry and exit pressure difference monitoring device, vapor heat exchanger A and vapor heat exchanger B it Between raw coke oven gas input channel on set switching valve, set block valve respectively on the tedge of vapor heat exchanger A, down-comer;Raw coke oven gas Entry and exit pressure difference monitoring device and switching valve, block valve interlocked control.
Ash cellar is set below the hot precipitator.
The heating furnace uses heated by gas.
The vapor heat exchanger A, vapor heat exchanger B sewerage output end pass through periodical blowdown expander connect blowdown Well.
Compared with prior art, the utility model has the beneficial effects that:
1) coal oven dithio-gas is led into waste heat boiler and carries out coal oven dithio-gas heat recovery and utilization, ensure heat-exchange system With coke oven independent operating;It is capable of the heat of high efficiente callback coal oven dithio-gas, produce the steam of many kinds of parameters and realizes process system Steam inside recycles, and reaches energy saving purpose;
2) recycling free of discontinuities of coal oven dithio-gas heat is realized, halt production coke cleaning is not required to, steam can be avoided to greatest extent It exchanges heat because of the possibility of coking booster;And steam user can be continuously, steam is provided;
3) abundant that self-produced 550 DEG C of low-pressure superheated steams are utilized as heat source is burnt, steam circulation utilization rate is improved, clearly Burnt effect is good, speed is fast, avoids the damage of mechanical decoking exchange heat pipe, while having saved the energy;
4) heat-exchange system and coke oven independent operation, are independent of each other, and can be matched with a variety of production-scale coke ovens;
5) it monitors coking situation in heat exchanger tube on-line, realizes and automatically switch between vapor heat exchanger A, B;
6) coke dry quenching furnace recyclegas utilization rate is improved;
7) water cycle efficieny is high in system, reduces outer net water supply.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram of coal oven dithio-gas heat recovery system free of discontinuities described in the utility model.
In figure:1. 2. hot precipitator of coke oven, 3. sweet-water tank, 4. deaerated feedwater pumps 5. oxygen-eliminating device, 6. boiler feedwater Pump 7. cryogenic heat exchanger, 8. tedge, 9. down-comer, 10. periodical blowdown expander, 11. sewage well, 12. ash cellar, 13. waste heat 17. decompressor of boiler 14. reducing-and-cooling plant, 15. steam superheater, 16. heating furnace, 18. vapor heat exchanger A 19. steams 20. drums of vapour heat exchanger B
Specific implementation mode
Specific embodiment of the present utility model is described further below in conjunction with the accompanying drawings:
As shown in Figure 1, a kind of coal oven dithio-gas heat recovery system free of discontinuities described in the utility model, including high-temperature dust removal Device 2, waste heat boiler 13, cryogenic heat exchanger 7, oxygen-eliminating device 5, sweet-water tank 3, heating furnace 16, reducing-and-cooling plant 14, steam superheating Device 15 and decompressor 17;The waste heat boiler 13 is connect by drum 20 and respectively by tedge 8, down-comer 9 with drum 20 Vapor heat exchanger A 18, vapor heat exchanger B 19;The gas collecting tube of the raw coke oven gas input terminal connection coke oven 1 of hot precipitator 2 is high Vapor heat exchanger A 18 in the raw coke oven gas output end connection waste heat boiler 13 of warm deduster 2 and vapor heat exchanger B 19;Desalination The demineralized water output end of water tank 3 passes through the demineralized water input terminal of 4 connection oxygen-eliminating device 5 of deaerated feedwater pump, the boiler feedwater of oxygen-eliminating device 5 Input terminal connects the boiler feedwater output end of cryogenic heat exchanger 7 by boiler feed pump 6, and the boiler feedwater of cryogenic heat exchanger 7 is defeated Enter end connection drum 20;The conduction oil output end of the conduction oil input terminal connection heating furnace 16 of cryogenic heat exchanger 7, cryogenic heat exchanger The conduction oil input terminal of 7 conduction oil output end connection heating furnace 16;The saturated vapor output end of drum 20 connects desuperheat simultaneously The desuperheating water input terminal of the saturated vapor input terminal of decompressor 14 and steam superheater 15, reducing-and-cooling plant 14 connects boiler 6 outlet conduit of feed pump;The low-pressure steam output end of reducing-and-cooling plant 14 connects low-pressure steam user;Steam superheater 15 is set The high pressure superheated steam output end of coke dry quenching furnace recyclegas entrance, steam superheater 15 connects high-voltage power user, steam superheating The high pressure superheated steam output end of device 15 connects vapor heat exchanger A 18 and vapor heat exchanger B 19 by decompressor 17.
The vapor heat exchanger A 18 sets raw coke oven gas entry and exit pressure difference monitoring device, and vapor heat exchanger A 18 and steam change Set switching valve on raw coke oven gas input channel between hot device B 19, on the tedge 8 of vapor heat exchanger A 18, down-comer 9 respectively If block valve;Raw coke oven gas entry and exit pressure difference monitoring device and switching valve, block valve interlocked control.
The lower section of the hot precipitator 2 sets ash cellar 12.
The heating furnace 16 uses heated by gas.
The vapor heat exchanger A 18, vapor heat exchanger B 19 sewerage output end pass through periodical blowdown expander 10 connect Connect sewage well 11.
A kind of technical process of coal oven dithio-gas high temperature section heat efficient system for reclaiming described in the utility model is as follows:
1) 650~750 DEG C of raw coke oven gas from coke oven enter gas collecting tube by the tedge of coke oven 1, enter after flue dust aggregation Hot precipitator 2 is dusted, and the raw coke oven gas after dedusting enters waste heat boiler 13 and exchanges heat, and the lime-ash after dedusting enters ash cellar Outer row after 12;
2) the vapor heat exchanger A 18 that raw coke oven gas enters in waste heat boiler 13 exchanges heat, and keeps raw coke oven gas inlet temperature about For 650 DEG C, 25~40m/s of mean flow rate, 330 DEG C of heat exchanger tube tube wall temperature;After heat exchange low temperature raw coke oven gas enter other workshop sections into Row low-temperature zone heat recovery;
3) simultaneously, the temperature after deaerated feedwater pump 4 enters oxygen-eliminating device 5 of the room temperature demineralized water in sweet-water tank 3 reaches 104 DEG C, 104 DEG C of deaerated feedwater enters cryogenic heat exchanger 7 through boiler feed pump 6 all the way, the 300 DEG C of heat conduction generated with heating furnace 16 Temperature reaches 210 DEG C after oil heat exchange;Another way is sent to reducing-and-cooling plant 14 and is used as desuperheating water;
4) after 210 DEG C of boiler feedwater enters drum 20, enter vapor heat exchanger A 18 through down-comer 9, handed over by heat It changes, becomes through tedge 8 to enter in drum 20 after steam water interface and carry out vapor-liquid separation, the high temperature and pressure saturated vapor of generation (10~13MPa of steam pressure, 311~331 DEG C of vapor (steam) temperature) send supreme pressure after being overheated into steam superheater 15 Electric user burns into feeding vapor heat exchanger A 18, vapor heat exchanger B 19 after the decompression of decompressor 17, or enters and subtract Warm decompressor 14 is sent after carrying out desuperheat, decompression to each low-pressure steam user;
5) the raw coke oven gas inlet outlet pressure differential of on-line monitoring vapor heat exchanger A 18, automatically switches when pressure difference reaches 1.5KPa To vapor heat exchanger B 19, the steam/water circulating process of vapor heat exchanger B 19 is identical with vapor heat exchanger A 18;At the same time, It takes in the high pressure superheated steam of the generation of steam superheater 15 all the way, it is logical to generate 550 DEG C of low-pressure superheated steams through decompressor 17 Enter in vapor heat exchanger A 18 and start on-line decoking, when stopping when product is clean water of burning that vapor heat exchanger A 18 is discharged is burnt It is burnt;
6) sewerage that waste heat boiler 13 generates in process of production is discharged into sewage well 11 through periodical blowdown expander 10.
The preferable specific implementation mode of the above, only the utility model, but the scope of protection of the utility model is not Be confined to this, any one skilled in the art within the technical scope disclosed by the utility model, according to this practicality Novel technical solution and its utility model design are subject to equivalent substitution or change, should all cover the protection model in the utility model Within enclosing.

Claims (5)

1. a kind of coal oven dithio-gas heat recovery system free of discontinuities, which is characterized in that including hot precipitator, waste heat boiler, low Warm heat exchanger, oxygen-eliminating device, sweet-water tank, heating furnace, reducing-and-cooling plant, steam superheater and decompressor;The waste heat pot Vapor heat exchanger A, the vapor heat exchanger B that stove is connected by drum and respectively by tedge, down-comer and drum;Hot precipitator Raw coke oven gas input terminal connection coke oven gas collecting tube, hot precipitator raw coke oven gas output end connection waste heat boiler in steam change Hot device A and vapor heat exchanger B;The demineralized water that the demineralized water output end of sweet-water tank pumps connection oxygen-eliminating device by deaerated feedwater inputs End, the boiler feedwater input terminal of oxygen-eliminating device connect the boiler feedwater output end of cryogenic heat exchanger by boiler feed pump, and low temperature changes The boiler feedwater input terminal of hot device connects drum;The conduction oil output of the conduction oil input terminal connection heating furnace of cryogenic heat exchanger End, the conduction oil input terminal of the conduction oil output end connection heating furnace of cryogenic heat exchanger;The saturated vapor output end of drum is simultaneously The saturated vapor input terminal of reducing-and-cooling plant and steam superheater is connected, the desuperheating water input terminal of reducing-and-cooling plant connects pot Stove feed pump outlet conduit;The low-pressure steam output end of reducing-and-cooling plant connects low-pressure steam user;Steam superheater sets dry Stove recyclegas entrance is put out, the high pressure superheated steam output end of steam superheater connects high-voltage power user, steam superheater High pressure superheated steam output end connects vapor heat exchanger A and vapor heat exchanger B by decompressor.
2. a kind of coal oven dithio-gas heat recovery system free of discontinuities according to claim 1, which is characterized in that the steam Heat exchanger A sets raw coke oven gas entry and exit pressure difference monitoring device, the raw coke oven gas input pipe between vapor heat exchanger A and vapor heat exchanger B It sets switching valve on road, block valve is set respectively on the tedge of vapor heat exchanger A, down-comer;Raw coke oven gas entry and exit pressure difference monitoring dress It sets and switching valve, block valve interlocked control.
3. a kind of coal oven dithio-gas heat recovery system free of discontinuities according to claim 1, which is characterized in that the high temperature Ash cellar is set below deduster.
4. a kind of coal oven dithio-gas heat recovery system free of discontinuities according to claim 1, which is characterized in that the heating Stove uses heated by gas.
5. a kind of coal oven dithio-gas heat recovery system free of discontinuities according to claim 1, which is characterized in that the steam Heat exchanger A, vapor heat exchanger B sewerage output end pass through periodical blowdown expander connect sewage well.
CN201721824021.0U 2017-12-22 2017-12-22 A kind of coal oven dithio-gas heat recovery system free of discontinuities Active CN207741061U (en)

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CN201721824021.0U CN207741061U (en) 2017-12-22 2017-12-22 A kind of coal oven dithio-gas heat recovery system free of discontinuities

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201721824021.0U CN207741061U (en) 2017-12-22 2017-12-22 A kind of coal oven dithio-gas heat recovery system free of discontinuities

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