CN103196130A - 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 PDFInfo
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- CN103196130A CN103196130A CN2013101543462A CN201310154346A CN103196130A CN 103196130 A CN103196130 A CN 103196130A CN 2013101543462 A CN2013101543462 A CN 2013101543462A CN 201310154346 A CN201310154346 A CN 201310154346A CN 103196130 A CN103196130 A CN 103196130A
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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
Technical field
Invention relates to a kind of oxygen-enriched combusting unit heat cascade utilization method, belongs to energy technology and green technology crossing domain.In addition, the invention still further relates to the device of implementing said method.
Background technology
A large amount of greenhouse gases CO of combustion of fossil fuel discharging
2The harm that environment is caused has caused showing great attention to of the whole world.At numerous CO
2In the middle of the separation and collection technology, but oxygen-enriched combustion technology reclaims CO as a kind of novel low-cost separation
2And the combustion system of the brand new ideas that pollutant emission is lower has caused various countries researchers' attention.
Owing to increased air separation subsystem and gas cleaning compression subsystem, the more conventional unit of unit generation efficient reduces by 8%～12%, has restricted the oxygen-enriched combustion technology commercial applications.The oxygen-enriched combusting system is comparatively complicated, has bigger optimization space.Especially produce a large amount of low-grade used heat in csa molecule system and the gas cleaning compression subsystem, take full advantage of this part waste heat boiler low pressure feed water, can reduce bleeder steam, improve steam turbine acting amount.Simultaneously, adopt the flue gas heated feed water, can effectively control exhaust gas temperature, realize the utilization of heat recovery, effectively improve unit generation efficient.
Summary of the invention
Technical problem: the objective of the invention is to disclose a kind of method of oxygen-enriched combusting unit heat cascade utilization, this method can significantly improve the heat comprehensive 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 may further comprise the steps:
Steps A: the boiler export flue gas shunting is become first's flue gas, second portion flue gas and third part flue gas; Described first flue gas is sent into the burner hearth of boiler again as circulating flue gas, and described second portion flue gas carries out preheating to the oxygen of sending into boiler, and described third part flue gas heats low pressure feed water;
Step B: second portion flue gas and third part flue gas are sent into flue gas condenser after heat exchange, send into flue gas compressor after being condensed to normal temperature;
Step C: after air compressed through air compressor, through sending into oxygen generation system after the cooling of compressed air low-pressure feed heater, the oxygen that oxygen generation system produces was sent into the oxygen preheat device;
Step D: the compression flue gas that the compressed air that air compressor produces and flue gas compressor produce heats the boiler low pressure feed water.
Preferably, also comprise in the steps A oxygen actual temperature after the preheating and predetermined temperature are compared, if be lower than predetermined temperature, then increase the second portion exhaust gas volumn; If be higher than predetermined temperature, then reduce the second portion exhaust gas volumn.
Preferably, first's flue gas accounts for 50%～70% of whole flue gases in the described steps A, and the second portion flue gas accounts for 15%～25% of whole flue gases.
The present invention also provides a kind of device of oxygen-enriched combusting unit heat cascade utilization, and this device comprises boiler, oxygen preheat device, flue gas low-pressure feed heater, compressed air low-pressure feed heater, compression flue gas low-pressure feed heater, air compressor, flue gas compressor, oxygen generation system and gas cleaning compressibility;
Boiler comprises first smoke outlet, second smoke outlet and the 3rd smoke outlet, and first smoke outlet links to each other with the first gas approach end of boiler; Second smoke outlet links to each other with the gas approach end of oxygen preheat device, and the 3rd smoke outlet links to each other with flue gas low-pressure feed heater gas approach end; The smoke outlet of the smoke outlet flue gas low-pressure feed heater of oxygen preheat device links to each other with the gas approach end of flue gas condenser respectively;
Air compressor air outlet slit end links to each other with compressed air low-pressure feed heater compressed air inlet end, the air outlet slit end of compressed air low-pressure feed heater links to each other with the air intlet end of oxygen generation system, and the oxygen outlet end of oxygen generation system links to each other with the oxygen inlet end of oxygen preheat device;
The flue gas compressor smoke outlet links to each other with compression flue gas low-pressure feed heater compression gas approach end, and compression flue gas low-pressure feed heater compression smoke outlet links to each other with the gas approach end of gas cleaning compressibility.
Preferably, described low-pressure feed heater utilizes flue gas that the boiler low pressure feed water is heated.
Preferably, the feed-water inlet end of described low-pressure feed heater is connected with for first water pump that extracts the boiler low pressure feed water, and described low-pressure feed heater arranges the pump-out of first flow controller control water pump; Described compressed air low-pressure feed heater feed-water inlet end is connected with for second water pump that extracts the boiler low pressure feed water, and described compressed air low-pressure feed heater arranges the pump-out of second flow controller control water pump; The feed-water inlet end of described compression flue gas low-pressure feed heater is connected with for the 3rd water pump that extracts the boiler low pressure feed water, and described compression flue gas low-pressure feed heater arranges the pump-out of the 3rd flow controller control water pump.
Beneficial effect: beneficial effect was after the present invention adopted technique scheme: 1) recycle the used heat of oxygen generation system and gas cleaning compressibility, reduce low pressure heat regenerative system steam and bleed, increase the steam turbine acting; 2) comprehensive utilization flue gas afterbody waste heat has reduced exhaust gas temperature, improves oxygen-enriched combusting Btu utilization efficient.
Description of drawings
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 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; The 3rd water pump 14.
The specific embodiment
The present invention will be further described below in conjunction with accompanying drawing and embodiment.
The present invention relates to a kind of oxygen-enriched combusting unit heat cascade utilization method, this method can significantly improve the system thermal utilization rate.
Another core of the present invention provides a kind of device of 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 the boiler is shunted, formed first's flue gas, second portion flue gas and third part flue gas.
Utilize described first flue gas as circulating flue gas, send into burner hearth again, described second portion flue gas carries out preheating to the oxygen of sending into boiler, and described third part flue gas heats low pressure feed water.
Actual temperature and the predetermined temperature of sending into the oxygen of burner hearth are compared.
If actual temperature obviously greater than predetermined temperature, then reduces the exhaust gas volumn of second portion; If less than predetermined temperature, then increase the exhaust gas volumn of second portion.
The amount of first's flue gas, second portion flue gas and third part flue gas can be regulated according to the purposes of flue gas, generally speaking, the amount of first's flue gas accounts for 50%～70% of whole exhaust gas volumns, and the exhaust gas volumn of second portion accounts for 15%～25% of whole exhaust gas volumns.
Second portion flue gas and third part flue gas mix after heat exchange sends into flue gas condenser 11, sends into flue gas compressor 8 after being condensed to normal temperature;
After air compressed through air compressor 5, through sending into oxygen generation system 7 after 6 coolings of compressed air low-pressure feed heater, the oxygen that oxygen generation system 7 produces was sent into oxygen preheat device 2, and other gases of the generation of oxygen generation system 7 do not deal with;
The compression flue gas that the compressed air that air compressor 5 produces and flue gas compressor 8 produce heats the boiler low pressure feed water;
Described compressed air low-pressure feed heater 6 outlet actual water temperatures and predetermined temperature are compared, if be lower than predetermined temperature, then reduce the described second water pump pump-out 13; If be higher than predetermined temperature, then increase described second water pump, 13 pump-outs.
Described compression flue gas low-pressure feed heater 9 outlet actual water temperatures and predetermined temperature are compared, if be lower than predetermined temperature, then reduce described the 3rd water pump 14 pump-outs; If be higher than predetermined temperature, then increase described the 3rd water pump 14 pump-outs.
The present invention also provides the device of 4. 1 kinds of oxygen-enriched combusting unit heat cascade utilizations, and this device comprises boiler 1, oxygen preheat device 2, flue gas low-pressure feed heater 3, compressed air low-pressure feed 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;
Described low-pressure feed heater 3 utilizes flue gas that the boiler low pressure feed water is heated.
The feed-water inlet end of described low-pressure feed heater 3 is connected with for first water pump 12 that extracts the boiler low pressure feed water, and described low-pressure feed heater 3 arranges the pump-out of first flow controller control water pump; Described compressed air low-pressure feed heater 6 feed-water inlet ends are connected with for second water pump 13 that extracts the boiler low pressure feed water, and described compressed air low-pressure feed heater 6 arranges the pump-out of second flow controller control water pump; The feed-water inlet end of described compression flue gas low-pressure feed heater 9 is connected with for the 3rd water pump 14 that extracts the boiler low pressure feed water, and described compression flue gas low-pressure feed heater 6 arranges the pump-out of the 3rd flow controller control water pump.
When flue gas low-pressure feed heater 3 pressure-drop in pipeline are higher, for realizing feedwater flowing between flue gas low-pressure feed heater 3 and steam turbine smoothly, first water pump 12 can be set between flue gas low-pressure feed heater 3 and steam turbine, first water pump 12 is used for extracting low pressure feed water, after flue gas low-pressure feed heater 3 is finished heating to low pressure feed water, this part low pressure feed water mixes with the feedwater of low-pressure regenerator heating, carries out follow-up heat treated.
In like manner, second water pump 13 is set between compressed air low-pressure feed heater 6 and steam turbine, is used 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, is used for extracting the low pressure feed water of steam turbine.
If feedwater can enter feed-water heater naturally, can omit first water pump 12, second water pump 13 and the 3rd water pump 14.
This invention can significantly improve the generating efficiency in oxygen-enriched combusting power station, reduces coal fired power plant CO
2The cost that captures.The heat that compresses flue gas in the flue gas heat of boiler, the oxygen generation system in compressed-air actuated heat and the gas cleaning compressibility is fully utilized, and has realized the cascade utilization of oxygen-enriched combusting internal system energy, has improved the generating efficiency of unit on the whole.
More than method and the device of oxygen-enriched combusting unit heat cascade utilization provided by the present invention is described in detail.Used specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof.Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of claim of the present invention.
Claims (6)
1. the method for an oxygen-enriched combusting unit heat cascade utilization is characterized in that this method may further comprise the steps:
Steps A: boiler (1) outlet flue gas shunting is become first's flue gas, second portion flue gas and third part flue gas; Described first flue gas is sent into the burner hearth of boiler (1) again as circulating flue gas, and described second portion flue gas carries out preheating to the oxygen of sending into boiler (1), and described third part flue gas heats low pressure feed water;
Step B: second portion flue gas and third part flue gas are sent into flue gas condenser (11) after heat exchange, send into flue gas compressor (8) after being condensed to normal temperature;
Step C: after air compressed through air compressor (5), through sending into oxygen generation system (7) after compressed air low-pressure feed heater (6) cooling, the oxygen that oxygen generation system (7) produces was sent into oxygen preheat device (2);
Step D: the compression flue gas that the compressed air that air compressor (5) produces and flue gas compressor (8) produce heats the boiler low pressure feed water.
2. the method for oxygen-enriched combusting unit heat cascade utilization as claimed in claim 1 is characterized in that, also comprises in the steps A oxygen actual temperature after the preheating and predetermined temperature are compared, if be lower than predetermined temperature, then increases the second portion exhaust gas volumn; If be higher than predetermined temperature, then reduce the second portion exhaust gas volumn.
3. the method for oxygen-enriched combusting unit heat cascade utilization as claimed in claim 1 or 2 is characterized in that first's flue gas accounts for 50%～70% of whole flue gases in the described steps A, and the second portion flue gas accounts for 15%～25% of whole flue gases.
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), flue gas low-pressure feed heater (3), compressed air low-pressure feed 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 first smoke outlet, second smoke outlet and the 3rd smoke outlet, and first smoke outlet links to each other with the first gas approach end of boiler (1); Second smoke outlet links to each other with the gas approach end of oxygen preheat device (2), and the 3rd smoke outlet links to each other with flue gas low-pressure feed heater (3) gas approach end; The smoke outlet of the smoke outlet flue gas low-pressure feed heater (3) of oxygen preheat device (2) links to each other with the gas approach end of flue gas condenser (11) respectively;
Air compressor (5) air outlet slit end links to each other with compressed air low-pressure feed heater (6) compressed air inlet end, the air outlet slit end of compressed air low-pressure feed heater (6) links to each other with the air intlet end of oxygen generation system (7), and the oxygen outlet end of oxygen generation system (7) links to each other with the oxygen inlet end of oxygen preheat device (2);
Flue gas compressor (8) smoke outlet links to each other with compression flue gas low-pressure feed heater (9) compression gas approach end, and compression flue gas low-pressure feed heater (9) compression smoke outlet links to each other 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 is characterized in that, described low-pressure feed heater (3) utilizes flue gas that the boiler low pressure feed water is heated.
6. the device of oxygen-enriched combusting unit heat cascade utilization as claimed in claim 5, it is characterized in that, the feed-water inlet end of described low-pressure feed heater (3) is connected with for first water pump (12) that extracts the boiler low pressure feed water, and described low-pressure feed heater (3) arranges the pump-out of first flow controller control water pump; Described compressed air low-pressure feed heater (6) feed-water inlet end is connected with for second water pump (13) that extracts the boiler low pressure feed water, and described compressed air low-pressure feed heater (6) arranges the pump-out of second flow controller control water pump; The feed-water inlet end of described compression flue gas low-pressure feed heater (9) is connected with for the 3rd water pump (14) that extracts the boiler low pressure feed water, and described compression flue gas low-pressure feed heater (6) arranges the pump-out of the 3rd flow controller control water pump.
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| CN201310154346.2A CN103196130B (en) | 2013-04-27 | 2013-04-27 | Method and device for gradient utilization of heat of oxygen-enriched combustion unit |
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| CN201310154346.2A CN103196130B (en) | 2013-04-27 | 2013-04-27 | Method and device for gradient utilization of heat of oxygen-enriched combustion unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109107211A (en) * | 2018-08-30 | 2019-01-01 | 东南大学 | The device and method that air and flue gas compressor and waste heat recycle in a kind of oxygen-enriched combustion system |
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| CN109107211B (en) * | 2018-08-30 | 2021-03-23 | 东南大学 | Device and method for compressing air and flue gas and recovering waste heat in oxygen-enriched combustion system |
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