CN103196130B - Method and device for gradient utilization of heat of oxygen-enriched combustion unit - Google Patents

Method and device for gradient utilization of heat of oxygen-enriched combustion unit Download PDF

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CN103196130B
CN103196130B CN201310154346.2A CN201310154346A CN103196130B CN 103196130 B CN103196130 B CN 103196130B CN 201310154346 A CN201310154346 A CN 201310154346A CN 103196130 B CN103196130 B CN 103196130B
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flue gas
oxygen
low
pressure feed
water
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CN103196130A (en
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段伦博
韩冬
段钰锋
向文国
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Southeast University
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Southeast University
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Abstract

The invention discloses a method and a device for gradient utilization of the heat of an oxygen-enriched combustion unit. The method comprises the following steps of: (A) dividing the outlet smoke of a boiler (1) into a first part of smoke, a second part of smoke and a third part of smoke, feeding the first part of smoke into a hearth of the boiler (1), preheating the oxygen fed into the boiler (1) by the second part of smoke, and heating the low-pressure feed water by the third part of smoke; (B) feeding the second part of smoke and the third part of smoke into a smoke condenser (11) after heat exchange, condensing to normal temperature and feeding into a smoke compressor (8); (C) compressing air by an air compressor (5), cooling by a compressed air low-pressure feed water heater (6) and feeding into an oxygen generation system (7), and feeding the oxygen generated by the oxygen generation system (7) into an oxygen preheater (2); and (D) heating the low-pressure feed water of the boiler. According to the invention, the power generation efficiency of an oxygen-enriched combustion power station is improved, and the CO2 trapping cost of the coal-fired power plant is reduced.

Description

A kind of method of oxygen-enriched combusting unit heat cascade utilization and device
Technical field
Invention relates to a kind of oxygen-enriched combusting unit heat stepped utilization method, belongs to energy technology and green technology crossing domain.In addition, the invention still further relates to the device implementing said method.
Background technology
A large amount of greenhouse gases CO of combustion of fossil fuel discharge 2showing great attention to of the whole world has been caused to the harm that environment causes.At numerous CO 2in the middle of separation and collection technology, oxygen-enriched combustion technology novel low-cost separation can reclaim CO as a kind of 2and the combustion system of the lower brand new ideas of pollutant emission has caused the attention of various countries researcher.
Owing to adding air separation subsystem and gas cleaning compression subsystem, unit generation efficiency comparatively conventional power unit reduces by 8% ~ 12%, constrains oxygen-enriched combustion technology commercial applications.Oxygen-enriched combustion system is comparatively complicated, there is larger optimization space.Especially produce a large amount of low-grade used heat in csa molecule system and gas cleaning compression subsystem, make full use of this part waste heat boiler low pressure feed water, can bleeder steam be reduced, improve steam turbine acting amount.Meanwhile, adopt flue gas feedwater, effectively can control exhaust gas temperature, realize the utilization of heat recovery, effectively improve unit generation efficiency.
Summary of the invention
Technical problem: the method that the object of the invention is openly a kind of oxygen-enriched combusting unit heat cascade utilization, the method can significantly improve heat integration utilization ratio.
Technical scheme: for solving the problems of the technologies described above, the present invention discloses a kind of method of oxygen-enriched combusting unit heat cascade utilization, and method comprises the following steps:
Steps A: boiler export flue gas shunting is become Part I flue gas, Part II flue gas and Part III flue gas; Described Part I flue gas, as circulating flue gas, sends into the burner hearth of boiler again, and described Part II flue gas carries out preheating to the oxygen sending into boiler, and described Part III flue gas heats low pressure feed water;
Step B: Part II flue gas and Part III flue gas send into flue gas condenser after heat exchange, send into flue gas compressor after being condensed to normal temperature;
Step C: air is after air compressor compression, and send into oxygen generation system after the cooling of compressed air low-pressure feed-water heater, the oxygen that oxygen generation system produces sends into oxygen preheat device;
Step D: the compressed air that air compressor produces and the compression flue gas that flue gas compressor produces heat boiler low pressure feed water.
Preferably, the oxygen actual temperature after also comprising preheating in steps A compares with predetermined temperature, if lower than predetermined temperature, then increases Part II exhaust gas volumn; If higher than predetermined temperature, then reduce Part II exhaust gas volumn.
Preferably, in described steps A, Part I flue gas accounts for 50% ~ 70% of whole flue gas, and Part II flue gas accounts for 15% ~ 25% of whole flue gas.
Present invention also offers a kind of device of oxygen-enriched combusting unit heat cascade utilization, this device comprises boiler, oxygen preheat device, low-pressure feed heater, compressed air low-pressure feed-water heater, compression flue gas low-pressure feed heater, air compressor, flue gas compressor, oxygen generation system and gas cleaning compressibility;
Boiler comprises the first smoke outlet, the second smoke outlet and the 3rd smoke outlet, and the first smoke outlet is connected with the first gas approach end of boiler; Second smoke outlet is connected with the gas approach end of oxygen preheat device, and the 3rd smoke outlet is connected with low-pressure feed heater gas approach end; The smoke outlet of oxygen preheat device, the smoke outlet of low-pressure feed heater are connected with the gas approach end of flue gas condenser respectively;
Air compressor air outlet slit end is connected with compressed air low-pressure feed-water heater compressed air inlet end, the air outlet slit end of compressed air low-pressure feed-water heater is connected with the air intlet end of oxygen generation system, and the oxygen outlet end of oxygen generation system is connected with the oxygen inlet end of oxygen preheat device;
Flue gas compressor smoke outlet compresses gas approach end with compression flue gas low-pressure feed heater and is connected, and compression flue gas low-pressure feed heater compression smoke outlet is connected with the gas approach end of gas cleaning compressibility.
Preferably, described low-pressure feed heater utilizes flue gas to heat boiler low pressure feed water.
Preferably, the feed-water inlet end of described low-pressure feed heater is connected with the first water pump for extracting boiler low pressure feed water, and described low-pressure feed heater arranges the pump-out that first flow controller controls water pump; Described compressed air low-pressure feed-water heater feed-water inlet end is connected with the second water pump for extracting boiler low pressure feed water, and described compressed air low-pressure feed-water heater arranges the pump-out that second amount controller controls water pump; The feed-water inlet end of described compression flue gas low-pressure feed heater is connected with the 3rd water pump for extracting boiler low pressure feed water, and described compression flue gas low-pressure feed heater arranges the pump-out that the 3rd flow controller controls water pump.
Beneficial effect: after the present invention adopts technique scheme, beneficial effect is: the used heat 1) recycling oxygen generation system and gas cleaning compressibility, reduces low pressure heat regenerative system steam and bleeds, increase steam turbine acting; 2) fully utilize flue gas afterbody waste heat, reduce exhaust gas temperature, improve oxygen-enriched combusting heating efficiency.
Accompanying drawing explanation
Fig. 1 is the structural representation of oxygen-enriched combusting unit heat cascade utilization.
Wherein, boiler 1; Oxygen preheat device 2; Low-pressure feed heater 3; Low-pressure regenerator 4; Air compressor 5; Compressed air low-pressure feed-water heater 6; Oxygen generation system 7; Flue gas compressor 8; Compression flue gas low-pressure feed heater 9; Gas cleaning compressibility 10; Flue gas condenser 11; First water pump 12; Second water pump 13; 3rd water pump 14.
Detailed description of the invention
Below in conjunction with accompanying drawing and embodiment, the present invention will be further described.
The present invention relates to a kind of oxygen-enriched combusting unit heat stepped utilization method, the method can significantly improve system thermal utilization rate.Another core of the present invention is to provide a kind of device implementing said method.Structure as shown in Figure 1.
The method of oxygen-enriched combusting unit heat cascade utilization provided by the invention:
The flue gas of discharging in boiler is shunted, forms Part I flue gas, Part II flue gas and Part III flue gas.
Utilize described Part I flue gas as circulating flue gas, again send into burner hearth, described Part II flue gas carries out preheating to the oxygen sending into boiler, and described Part III flue gas heats low pressure feed water.
The actual temperature of the oxygen sending into burner hearth is compared with predetermined temperature.
If actual temperature is obviously greater than predetermined temperature, then reduce the exhaust gas volumn of Part II; If be less than predetermined temperature, then increase the exhaust gas volumn of Part II.
The amount of Part I flue gas, Part II flue gas and Part III flue gas can regulate according to the purposes of flue gas, generally, the amount of Part I flue gas accounts for 50% ~ 70% of whole exhaust gas volumn, and the exhaust gas volumn of Part II accounts for 15% ~ 25% of whole exhaust gas volumn.
Part II flue gas and Part III flue gas mix after heat exchange sends into flue gas condenser 11, sends into flue gas compressor 8 after being condensed to normal temperature;
Air, after air compressor 5 compresses, sends into oxygen generation system 7 after compressed air low-pressure feed-water heater 6 cools, and the oxygen that oxygen generation system 7 produces sends into oxygen preheat device 2, and other gases of the generation of oxygen generation system 7 do not deal with;
The compressed air that air compressor 5 produces and the compression flue gas that flue gas compressor 8 produces heat boiler low pressure feed water;
Described compressed air low-pressure feed-water heater 6 is exported actual water temperature compare with predetermined temperature, if lower than predetermined temperature, then reduce described second pumping for water pump amount 13; If higher than predetermined temperature, then increase described second water pump 13 pump-out.
Described compression flue gas low-pressure feed heater 9 is exported actual water temperature compare with predetermined temperature, if lower than predetermined temperature, then reduce described 3rd water pump 14 pump-out; If higher than predetermined temperature, then increase described 3rd water pump 14 pump-out.
The present invention also provides a kind of device of oxygen-enriched combusting unit heat cascade utilization, and this device comprises boiler 1, oxygen preheat device 2, low-pressure feed heater 3, compressed air low-pressure feed-water heater 6, compression flue gas low-pressure feed heater 9, air compressor 5, flue gas compressor 8, oxygen generation system 7 and gas cleaning compressibility 10;
Boiler 1 comprises the first smoke outlet, the second smoke outlet and the 3rd smoke outlet, and the first smoke outlet is connected with the first gas approach end of boiler 1; Second smoke outlet is connected with the gas approach end of oxygen preheat device 2, and the 3rd smoke outlet is connected with low-pressure feed heater 3 gas approach end; The smoke outlet of the smoke outlet low-pressure feed heater 3 of oxygen preheat device 2 is connected with the gas approach end of flue gas condenser 11 respectively;
Air compressor 5 air outlet slit end is connected with compressed air low-pressure feed-water heater 6 compressed air inlet end, the air outlet slit end of compressed air low-pressure feed-water heater 6 is connected with the air intlet end of oxygen generation system 7, and the oxygen outlet end of oxygen generation system 7 is connected with the oxygen inlet end of oxygen preheat device 2;
Flue gas compressor 8 smoke outlet compresses gas approach end with compression flue gas low-pressure feed heater 9 and is connected, and compression flue gas low-pressure feed heater 9 compresses smoke outlet and is connected with the gas approach end of gas cleaning compressibility 10.
Described low-pressure feed heater 3 utilizes flue gas to heat boiler low pressure feed water.
The feed-water inlet end of described low-pressure feed heater 3 is connected with the first water pump 12 for extracting boiler low pressure feed water, and described low-pressure feed heater 3 arranges the pump-out that first flow controller controls water pump; Described compressed air low-pressure feed-water heater 6 feed-water inlet end is connected with the second water pump 13 for extracting boiler low pressure feed water, and described compressed air low-pressure feed-water heater 6 arranges the pump-out that second amount controller controls water pump; The feed-water inlet end of described compression flue gas low-pressure feed heater 9 is connected with the 3rd water pump 14 for extracting boiler low pressure feed water, and described compression flue gas low-pressure feed heater 9 arranges the pump-out that the 3rd flow controller controls water pump.
When low-pressure feed heater 3 pressure-drop in pipeline is higher, for realizing the flowing of feeding water between low-pressure feed heater 3 and steam turbine smoothly, can the first water pump 12 be set between low-pressure feed heater 3 and steam turbine, first water pump 12 is for extracting low pressure feed water, after the heating that low-pressure feed heater 3 completes low pressure feed water, the feedwater that this part low pressure feed water and low-pressure regenerator heat mixes, and carries out follow-up heating.
In like manner, the second water pump 13 is set between compressed air low-pressure feed-water heater 6 and steam turbine, for extracting the low pressure feed water of steam turbine; Between compression flue gas low-pressure feed heater 9 and steam turbine, the 3rd water pump 14 is set, for extracting the low pressure feed water of steam turbine.
If feedwater can enter feed-water heater naturally, the first water pump 12, second water pump 13 and the 3rd water pump 14 can be omitted.
This invention can significantly improve the generating efficiency in oxygen-enriched combusting power station, reduces coal fired power plant CO 2the cost of trapping.The heat compressing flue gas in the flue gas heat of boiler, oxygen generation system in compressed-air actuated heat and gas cleaning compressibility is fully utilized, and achieves the cascade utilization of oxygen-enriched combustion system internal energy, improves the generating efficiency of unit on the whole.
Above the method for oxygen-enriched combusting unit heat cascade utilization provided by the present invention and device are described in detail.Apply specific case herein to set forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improve and modify and also fall in the protection domain of the claims in the present invention.

Claims (5)

1. a method for oxygen-enriched combusting unit heat cascade utilization, it is characterized in that, the method comprises the following steps:
Steps A: boiler (1) exiting flue gas is split into Part I flue gas, Part II flue gas and Part III flue gas; Described Part I flue gas is as circulating flue gas, again the burner hearth of boiler (1) is sent into, described Part II flue gas carries out preheating to the oxygen sending into boiler (1) by oxygen preheat device (2), and described Part III flue gas heats low pressure feed water;
Step B: Part II flue gas and Part III flue gas send into flue gas condenser (11) after heat exchange, sends into flue gas compressor (8) after being condensed to normal temperature;
Step C: air is after air compressor (5) compression, after compressed air low-pressure feed-water heater (6) cooling, send into oxygen generation system (7), the oxygen that oxygen generation system (7) produces sends into oxygen preheat device (2);
Step D: the compressed air that air compressor (5) produces and the compression flue gas that flue gas compressor (8) produces heat boiler low pressure feed water.
2. the method for oxygen-enriched combusting unit heat cascade utilization as claimed in claim 1, it is characterized in that, the oxygen actual temperature after also comprising preheating in steps A compares with predetermined temperature, if lower than predetermined temperature, then increases Part II exhaust gas volumn; If higher than predetermined temperature, then reduce Part II exhaust gas volumn.
3. the method for oxygen-enriched combusting unit heat cascade utilization as claimed in claim 1 or 2, it is characterized in that, in described steps A, Part I flue gas accounts for 50% ~ 70% of whole flue gas, and Part II flue gas accounts for 15% ~ 25% of whole flue gas.
4. the device of an oxygen-enriched combusting unit heat cascade utilization, it is characterized in that, this device comprises boiler (1), oxygen preheat device (2), low-pressure feed heater (3), compressed air low-pressure feed-water heater (6), compression flue gas low-pressure feed heater (9), air compressor (5), flue gas compressor (8), oxygen generation system (7) and gas cleaning compressibility (10);
Boiler (1) comprises the first smoke outlet, the second smoke outlet and the 3rd smoke outlet, and the first smoke outlet is connected with the first gas approach end of boiler (1); Second smoke outlet is connected with the gas approach end of oxygen preheat device (2), and the 3rd smoke outlet flue gas is connected with the gas approach end of low-pressure feed heater (3); The smoke outlet of oxygen preheat device (2), the smoke outlet of low-pressure feed heater (3) are connected with the gas approach end of flue gas condenser (11) respectively, the outlet termination flue gas compressor (8) of flue gas condenser (11);
Air compressor (5) air outlet slit end is connected with compressed air low-pressure feed-water heater (6) compressed air inlet end, the air outlet slit end of compressed air low-pressure feed-water heater (6) is connected with the air intlet end of oxygen generation system (7), and the oxygen outlet end of oxygen generation system (7) is connected with the oxygen inlet end of oxygen preheat device (2);
Flue gas compressor (8) smoke outlet compresses gas approach end with compression flue gas low-pressure feed heater (9) and is connected, and compression flue gas low-pressure feed heater (9) compression smoke outlet is connected with the gas approach end of gas cleaning compressibility (10).
5. the device of oxygen-enriched combusting unit heat cascade utilization as claimed in claim 4, it is characterized in that, the feed-water inlet end of described low-pressure feed heater (3) is connected with the first water pump (12) for extracting boiler low pressure feed water, and described low-pressure feed heater (3) arranges the pump-out that first flow controller controls the first water pump (12); Described compressed air low-pressure feed-water heater (6) feed-water inlet end is connected with the second water pump (13) for extracting boiler low pressure feed water, and described compressed air low-pressure feed-water heater (6) arranges the pump-out that second amount controller controls the second water pump (13); The feed-water inlet end of described compression flue gas low-pressure feed heater (9) is connected with the 3rd water pump (14) for extracting boiler low pressure feed water, and described compression flue gas low-pressure feed heater (9) arranges the pump-out that the 3rd flow controller controls the 3rd water pump (14).
CN201310154346.2A 2013-04-27 2013-04-27 Method and device for gradient utilization of heat of oxygen-enriched combustion unit Active CN103196130B (en)

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