CN103234213A - Method and device for utilizing oxygen-enriched combustion heat - Google Patents
Method and device for utilizing oxygen-enriched combustion heat Download PDFInfo
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- CN103234213A CN103234213A CN2013101540248A CN201310154024A CN103234213A CN 103234213 A CN103234213 A CN 103234213A CN 2013101540248 A CN2013101540248 A CN 2013101540248A CN 201310154024 A CN201310154024 A CN 201310154024A CN 103234213 A CN103234213 A CN 103234213A
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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
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
The invention discloses a method and a device for utilizing oxygen-enriched combustion heat. The method comprises step A, dividing outlet flue gas of a boiler (1) into a first part of flue gas, a second part of flue gas and a third part of flue gas, wherein the first part of flue gas preheats oxygen fed into the boiler (1), the second part of flue gas heats circulating flue gas fed into the boiler (1), and the third part of flue gas heats water; and step B, mixing and feeding the first part of flue gas, the second part of flue gas and the third part of flue gas into a flue gas condenser (18) after heat exchange, dividing the flue gas into two parts after the flue gas is dried and condensed to the normal temperature, feeding one part of flue gas into circulating flue gas preheater (3) as circulating flue gas, and feeding the other part of flue gas into a flue gas compressor (11). By means of the method and the device, the power generation efficiency of an oxygen-enriched combustion power station can be improved remarkably, and CO2 trapping costs of coal-fired power plants can be reduced.
Description
Technical field
The present invention relates to a kind of oxygen-enriched combusting Btu utilization method, belong 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 oxygen subsystem processed 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 oxygen-enriched combusting unit Btu utilization method, 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 Btu utilization, and this 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 carries out preheating to the oxygen of sending into boiler, and described second portion flue gas heats the circulating flue gas of sending into boiler, and described third part flue gas heats feedwater;
Step B: first's flue gas, second portion flue gas and third part flue gas mix after heat exchange sends into flue gas condenser, and drying is divided into two parts after being condensed to normal temperature, and a part is sent into the circulating flue gas preheater as circulating flue gas, and a part is sent into flue gas compressor;
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 first's exhaust gas volumn; If be higher than predetermined temperature, then reduce first's exhaust gas volumn;
Circulating flue gas 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 40%～50% of whole flue gases in the described steps A, and the second portion flue gas accounts for 30%～40% of whole flue gases.
The present invention also provides a kind of device of oxygen-enriched combusting Btu utilization, and this device comprises boiler, oxygen preheat device, circulating flue gas preheater, flue gas feed-water 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 oxygen preheat device gas approach end; Second smoke outlet links to each other with the gas approach end of circulating flue gas preheater, and the 3rd smoke outlet links to each other with flue gas feed-water heater gas approach end; The smoke outlet of the smoke outlet of the smoke outlet of oxygen preheat device, circulating flue gas preheater, flue gas low-pressure feed heater 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; 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 flue gas feed-water heater comprises flue gas high-pressure feed-water heater and flue gas low-pressure feed heater, the gas approach end of described high-pressure feed-water heater links to each other with the third part smoke outlet of described boiler, the smoke outlet of described flue gas high-pressure feed-water heater links to each other with the gas approach end of described flue gas low-pressure feed heater, and the smoke outlet of low-pressure feed heater links to each other with the gas approach end of flue gas condenser.
Preferably, the feed-water inlet end of described flue gas high-pressure feed-water heater is connected with for first water pump that extracts the Boiler High Pressure feedwater, and the flue gas high-pressure feed-water heater arranges the pump-out of first flow controller control water pump; The feed-water inlet end of described flue gas low-pressure feed heater is connected with for second water pump that extracts the boiler low pressure feed water, and the flue gas low-pressure feed heater arranges the pump-out of second flow controller control water pump; Described compressed air low-pressure feed heater feed-water inlet end is connected with for the 3rd water pump that extracts the boiler low pressure feed water, and the compressed air low-pressure feed heater arranges the pump-out of flow controller control water pump; Described compression flue gas low-pressure feed heater feed-water inlet end is connected with for the 4th water pump that extracts the boiler low pressure feed water, and compression flue gas low-pressure feed heater arranges the pump-out of 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 Btu utilization.
Wherein, boiler 1; Oxygen preheat device 2; Circulating flue gas preheater 3; Low-pressure feed heater 4; High-pressure feed-water heater 5; High pressure regenerator 6; Low-pressure regenerator 7; Air compressor 8; Compressed air low-pressure feed heater 9; Oxygen generation system (10); Flue gas compressor 11; Compression flue gas low-pressure feed heater 11; Gas cleaning compressibility 13; First water pump 14; Second water pump 15; The 3rd water pump 16; The 4th water pump 17.
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 Btu utilization method, this method can significantly improve the generating efficiency in oxygen-enriched combusting power station, reduces coal fired power plant CO
2The cost that captures.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 Btu 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 that the oxygen of sending into burner hearth 1 is carried out preheating, described second portion flue gas carries out preheating to the circulating flue gas of sending into burner hearth 1, and the heat of described third part flue gas is used for the heating boiler feedwater.
Actual temperature and the predetermined temperature of sending into the oxygen of burner hearth 1 are compared.
If actual temperature obviously greater than predetermined temperature, then reduces the exhaust gas volumn of first; If less than predetermined temperature, then increase the exhaust gas volumn of first.
Actual temperature and the predetermined temperature of sending into the circulating flue gas of burner hearth 1 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 transferred according to the purposes of flue gas and be increased, generally speaking, the amount of first's flue gas accounts for 40%～50% of whole exhaust gas volumns, and the exhaust gas volumn of second portion accounts for 30%～40% of whole exhaust gas volumns.
First's flue gas, second portion flue gas and third part flue gas are sent into flue gas condenser 18 through mixing after the heat exchange, drying is divided into two parts after being condensed to normal temperature, a part is sent into circulating flue gas preheater 3 as circulating flue gas, and a part is sent into flue gas compressor 11.
After air was sent into air compressor compression 8, through sending into oxygen generation system 10 after 9 coolings of compressed air low-pressure feed heater, the oxygen that oxygen generation system 10 produces was sent into oxygen preheat device 2, and other gases that oxygen generation system 10 produces do not deal with;
The compression flue gas that the compressed air that air compressor 8 produces and flue gas compressor 11 produce heats the boiler low pressure feed water.
Described compressed air 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 16 pump-outs; If be higher than predetermined temperature, then increase described the 3rd water pump 16 pump-outs.
Described compression flue gas low-pressure feed heater 12 outlet actual water temperatures and predetermined temperature are compared, if be lower than predetermined temperature, then reduce described the 4th water pump 17 pump-outs; If be higher than predetermined temperature, then increase described the 4th water pump 17 pump-outs.
The present invention also provides a kind of device of oxygen-enriched combusting Btu utilization, and this device comprises boiler 1, oxygen preheat device 2, circulating flue gas preheater 3, flue gas feed-water heater, compressed air low-pressure feed heater 9, compression flue gas low-pressure feed heater 12, air compressor 8, flue gas compressor 11, oxygen generation system 10 and gas cleaning compressibility 13;
Boiler 1 comprises first smoke outlet, second smoke outlet and the 3rd smoke outlet, and first smoke outlet links to each other with oxygen preheat device 2 gas approach ends; Second smoke outlet links to each other with the gas approach end of circulating flue gas preheater 3, and the 3rd smoke outlet links to each other with flue gas feed-water heater gas approach end; The smoke outlet of the smoke outlet of the smoke outlet of oxygen preheat device 2, circulating flue gas preheater 3, flue gas low-pressure feed heater 5 links to each other with the gas approach end of flue gas condenser 18 respectively;
Described flue gas feed-water heater comprises flue gas high-pressure feed-water heater 4 and flue gas low-pressure feed heater 5, the gas approach end of described high-pressure feed-water heater 4 links to each other with the third part smoke outlet of described boiler 1, the smoke outlet of described flue gas high-pressure feed-water heater 4 links to each other with the gas approach end of described flue gas low-pressure feed heater 5, and the smoke outlet of low-pressure feed heater 5 links to each other with the gas approach end of flue gas condenser 18.
The feed-water inlet end of described flue gas high-pressure feed-water heater 4 is connected with for first water pump 8 that extracts the Boiler High Pressure feedwater, and flue gas high-pressure feed-water heater 4 arranges the pump-out of first flow controller control water pump; The feed-water inlet end of described flue gas low-pressure feed heater 5 is connected with for second water pump 15 that extracts the boiler low pressure feed water, and flue gas low-pressure feed heater 5 arranges the pump-out of second flow controller control water pump; Described compressed air low-pressure feed heater 9 feed-water inlet ends are connected with for the 3rd water pump 16 that extracts the boiler low pressure feed water, and compressed air low-pressure feed heater 9 arranges the pump-out of flow controller control water pump; Described compression flue gas low-pressure feed heater 12 feed-water inlet ends are connected with for the 4th water pump 17 that extracts the boiler low pressure feed water, and compression flue gas low-pressure feed heater 12 arranges the pump-out of flow controller control water pump.
Above-mentioned flue gas feed-water heater can comprise flue gas high-pressure feed-water heater 4 and the flue gas low-pressure feed heater 5 that links to each other successively, the gas approach end of flue gas high-pressure feed-water heater 4 links to each other with described third part smoke outlet, flue gas high-pressure feed-water heater 4 smoke outlets link to each other with flue gas low-pressure feed heater 5 smoke outlets, the third part flue gas at first enters 4 pairs of high-pressure feed waters of flue gas high-pressure feed-water heater and heats, and then enter 5 pairs of low pressure feed waters of flue gas low-pressure feed heater and heat, realize the cascade utilization of energy, reduced the bleeder steam amount.
The air intlet end of described compressed air low-pressure feed heater 9 links to each other with air compressor 8 air outlet slit ends; The gas approach end of described compression flue gas low-pressure feed heater 12 links to each other with flue gas compressor 11 smoke outlets
When flue gas feed-water heater pressure-drop in pipeline is higher, for realizing feedwater flowing between flue gas feed-water heater and steam turbine smoothly, first water pump 14 can be set between flue gas high-pressure feed-water heater 4 and steam turbine, first water pump 14 is used for extracting high-pressure feed water, after high-pressure feed-water heater is finished heating to high-pressure feed water, this part high-pressure feed water mixes with the feedwater of high pressure regenerator heating, carries out follow-up heat treated.
In like manner, second water pump 15 can be set between the pipeline of low-pressure feed heater 5 and steam turbine, be used for extracting the low pressure feed water of steam turbine; The 3rd water pump 16 is set between compressed air low-pressure feed heater 9 and steam turbine, is used for extracting the low pressure feed water of steam turbine; Between compression flue gas low-pressure feed heater 12 and steam turbine, the 4th water pump 17 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 14, second water pump 15, the 3rd water pump 16 and the 4th water pump 17.
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 of the compressed air heat of the flue gas heat of boiler, oxygen piece-rate system processed and the compression flue gas of gas cleaning compressibility is fully utilized, realize the cascade utilization of oxygen-enriched combusting internal system energy, improved the generating efficiency of unit on the whole.
More than method and the device of oxygen-enriched combusting Btu 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 enjoy 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 Btu 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 carries out preheating to the oxygen of sending into boiler (1), and described second portion flue gas heats the circulating flue gas of sending into boiler (1), and described third part flue gas heats feedwater;
Step B: first's flue gas, second portion flue gas and third part flue gas mix after heat exchange sends into flue gas condenser (18), drying is divided into two parts after being condensed to normal temperature, a part is sent into circulating flue gas preheater (3) as circulating flue gas, and a part is sent into flue gas compressor (11);
Step C: after air compressed through air compressor (8), through sending into oxygen generation system (11) after compressed air low-pressure feed heater (9) cooling, the oxygen that oxygen generation system (11) produces was sent into oxygen preheat device (2);
Step D: the compression flue gas that the compressed air that air compressor (8) produces and flue gas compressor (11) produce heats the boiler low pressure feed water.
2. the method for oxygen-enriched combusting Btu 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 first's exhaust gas volumn; If be higher than predetermined temperature, then reduce first's exhaust gas volumn;
Circulating flue gas 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.
3. the method for oxygen-enriched combusting Btu utilization as claimed in claim 1 or 2 is characterized in that, first's flue gas accounts for 40%～50% of whole flue gases in the described steps A, and the second portion flue gas accounts for 30%～40% of whole flue gases.
4. the device of an oxygen-enriched combusting Btu utilization, it is characterized in that this device comprises boiler (1), oxygen preheat device (2), circulating flue gas preheater (3), flue gas feed-water heater, compressed air low-pressure feed heater (9), compression flue gas low-pressure feed heater (12), air compressor (8), flue gas compressor (11), oxygen generation system (10) and gas cleaning compressibility (13);
Boiler (1) comprises first smoke outlet, second smoke outlet and the 3rd smoke outlet, and first smoke outlet links to each other with oxygen preheat device (2) gas approach end; Second smoke outlet links to each other with the gas approach end of circulating flue gas preheater (3), and the 3rd smoke outlet links to each other with flue gas feed-water heater gas approach end; The smoke outlet of the smoke outlet of the smoke outlet of oxygen preheat device (2), circulating flue gas preheater (3), flue gas low-pressure feed heater (5) links to each other with the gas approach end of flue gas condenser (18) respectively;
Air compressor (8) air outlet slit end links to each other with compressed air low-pressure feed heater (9) compressed air inlet end, the air outlet slit end of compressed air low-pressure feed heater (9) links to each other with the air intlet end of oxygen generation system (10), and the oxygen outlet end of oxygen generation system (10) links to each other with the oxygen inlet end of oxygen preheat device (2);
Flue gas compressor (11) smoke outlet links to each other with compression flue gas low-pressure feed heater (12) compression gas approach end; Compression flue gas low-pressure feed heater (12) compression smoke outlet links to each other with the gas approach end of gas cleaning compressibility (13).
5. the device of oxygen-enriched combusting Btu utilization as claimed in claim 4, it is characterized in that, described flue gas feed-water heater comprises flue gas high-pressure feed-water heater (4) and flue gas low-pressure feed heater (5), the gas approach end of described high-pressure feed-water heater (4) links to each other with the third part smoke outlet of described boiler (1), the smoke outlet of described flue gas high-pressure feed-water heater (4) links to each other with the gas approach end of described flue gas low-pressure feed heater (5), and the smoke outlet of low-pressure feed heater (5) links to each other with the gas approach end of flue gas condenser (18).
6. the device of oxygen-enriched combusting Btu utilization as claimed in claim 5, it is characterized in that, the feed-water inlet end of described flue gas high-pressure feed-water heater (4) is connected with for first water pump (8) that extracts the Boiler High Pressure feedwater, and flue gas high-pressure feed-water heater (4) arranges the pump-out of first flow controller control water pump; The feed-water inlet end of described flue gas low-pressure feed heater (5) is connected with for second water pump (15) that extracts the boiler low pressure feed water, and flue gas low-pressure feed heater (5) arranges the pump-out of second flow controller control water pump; Described compressed air low-pressure feed heater (9) feed-water inlet end is connected with for the 3rd water pump (16) that extracts the boiler low pressure feed water, and compressed air low-pressure feed heater (9) arranges the pump-out of flow controller control water pump; Described compression flue gas low-pressure feed heater (12) feed-water inlet end is connected with for the 4th water pump (17) that extracts the boiler low pressure feed water, and compression flue gas low-pressure feed heater (12) arranges the pump-out of flow controller control water pump.
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Cited By (3)
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| CN103496672A (en) * | 2013-09-30 | 2014-01-08 | 南京理工大学 | Device and process for preparing O2-CO2 mixed gas based on chemical-looping technology |
| CN103776026A (en) * | 2014-01-24 | 2014-05-07 | 东南大学 | Device and method for reducing high-temperature corrosion of power station boiler by use of waste heat of flue gas |
| 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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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103496672A (en) * | 2013-09-30 | 2014-01-08 | 南京理工大学 | Device and process for preparing O2-CO2 mixed gas based on chemical-looping technology |
| CN103496672B (en) * | 2013-09-30 | 2015-04-29 | 南京理工大学 | Device and process for preparing O2-CO2 mixed gas based on chemical-looping technology |
| CN103776026A (en) * | 2014-01-24 | 2014-05-07 | 东南大学 | Device and method for reducing high-temperature corrosion of power station boiler by use of waste heat of flue gas |
| CN103776026B (en) * | 2014-01-24 | 2016-04-13 | 东南大学 | A kind of device and method utilizing fume afterheat to reduce high-temperature corrosion of power station boiler |
| 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 |
| 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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