CN101737766A - Coal-water boiler exhaust gas residual heat recovery device - Google Patents
Coal-water boiler exhaust gas residual heat recovery device Download PDFInfo
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- CN101737766A CN101737766A CN201010013655A CN201010013655A CN101737766A CN 101737766 A CN101737766 A CN 101737766A CN 201010013655 A CN201010013655 A CN 201010013655A CN 201010013655 A CN201010013655 A CN 201010013655A CN 101737766 A CN101737766 A CN 101737766A
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
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Abstract
A coal-water boiler exhaust gas residual heat recovery device is characterized in that a cyclic heat exchange system using water as the heat transfer medium separates a boiler exhaust gas cooler from a residual heat utilization device, thus avoiding the safety problem caused by heating surface leakage and simultaneously realizing seasonal change of the exhaust gas residual heat utilization device. Specifically, a gas cooler is arranged in a gas flue behind an air preheater (or dust catcher), the water is used as the heat transfer medium, firstly the water is heated in the gas cooler to reduce the exhaust gas temperature, and then the heat absorbed by the water in the gas cooler is released in another heat exchanger to be used for heating the main condensed water to raise the temperature of the low pressure feed water or heating the cold air to raise the inlet air temperature of the boiler. After the system is adopted, the boiler exhaust gas residual heat can be fully and effectively recovered, the steam extraction capacity of the heat regenerative system can be reduced, the generated output of the set can be increased and the coal consumption in power generation can be reduced.
Description
Technical field
The invention belongs to the energy conserving system that the power plant boiler smoke discharging residual heat is recycled, be specifically related to a kind of hydrophily formula boiler exhaust gas heat recovery device.
Background technology
Usually, for big capacity bituminous coal fired boiler unit, the exhaust gas temperature design load is generally about 125 ℃; For meager coal and anthracite-fired boiler unit, the exhaust gas temperature design load is generally about 140 ℃; For high-moisture boiler using brown coal unit, the exhaust gas temperature design load usually up to 150 ℃ about.In the boiler actual motion, owing to aspects such as ature of coal variation, heating surface contamination dust stratification, boiler leak out, actual exhaust gas temperature often is higher than design load.
The fired power generating unit of domestic early stage operation, the design exhaust gas temperature of its bituminous coal fired boiler is generally about 140 ℃, the exhaust gas temperature during some boiler actual motion up to 150 ℃～170 ℃.For 300MW and above big capacity coal-fired power station boiler, about 20 ℃ of the general every reductions of exhaust gas temperature, boiler efficiency approximately can improve 1 percentage point, can make the unit generation coal consumption reduce about 3.5g/kWh, and is comparatively remarkable to the effect that improves unit economy.Therefore, when exhaust gas temperature is higher, recommend to adopt flue gas waste heat recovery to utilize system.Flue gas waste heat recovery utilizes technology that long research and ripe utilization have been arranged abroad, but application at home is very limited.Along with the situation of the anxiety of electric coal supply and AND ENERGY RESOURCES CONSUMPTION IN CHINA is severe further, country is strict more to energy-saving and cost-reducing requirement, and each big Power Group is all utilizing various means to reduce gross coal consumption rates.
Domestic existing flue gas waste heat recovery system normally directly allows the part low pressure feed water flow through the heat exchanger that is placed in the back-end ductwork, absorbs flue gas heat, reduces exhaust gas temperature.The serious problems that this fume afterheat utilizes system to exist are that feed-water heater is placed directly in the flue, and condition of work is abominable, and wearing and tearing and cold end corrosion are inevitable.In case the heat exchanger wearing and tearing, boiler feedwater directly contacts with flue gas, has a strong impact on boiler water system safety, may cause safety problems such as jumping machine, blowing out, brings serious economy loss.And this fume afterheat system only is used for heating low pressure feed water, because exhaust gas temperature is very low can not put into operation substantially, number is very low when utilizing in the winter time.And when temperature was too low, for the safe operation of unit, the steam air heater that must put into operation had further reduced economy again.
Existing station boiler is all installed rotary regenerative air preheater basically, and the rotation of rotary regenerative air preheater causes the stepped distribution of cigarette temperature in the air preheater exhaust pass, and the difference of outside cigarette temperature was between 20-35 ℃ in actual measurement of engineering result showed.Existing equally distributed coil heat exchanger structure can not make full use of this thermograde, has reduced heat exchange efficiency, can not make full use of fume afterheat.
Summary of the invention
The object of the present invention is to provide a kind of waste heat of station boiler smoke evacuation that makes to obtain recycling fully effectively, reduce the amount of drawing gas of heat regenerative system, improve unit generation and exert oneself, reduce gross coal consumption rate, improve the hydrophily formula boiler exhaust gas heat recovery device of the economy of unit operation
For achieving the above object, the technical solution used in the present invention is: comprise being arranged in the gas cooler in the back-end ductwork after air preheater or the deduster, be arranged in feed-water heater and air heater outside the back-end ductwork, said gas cooler is through the inlet header case, the outlet of outlet collection case and feed-water heater and the inlet formation enclosed heat-exchanging loop that is connected, and on the entrance pipe of outlet collection case and feed-water heater, be disposed with water circulating pump and UTILIZATION OF VESIDUAL HEAT IN guide valve, the inlet of said air heater is connected with the UTILIZATION OF VESIDUAL HEAT IN guide valve, the outlet of air heater is connected with the inlet header case by the road, and the export pipeline at air heater and feed-water heater is separately installed with air heater gate valve and feed-water heater gate valve, feed-water heater and low-pressure heater are arranged in parallel, and also are provided with low-pressure heater divide water regulating valve on low-pressure heater and pipeline that feed-water heater is connected.
Gas cooler of the present invention adopts the material of sulfuric-resisting corrosion to make.The S-shaped tube panel of gas cooler arranges that according to cigarette temperature distribution density cigarette temperature upper side is close in flue, the cigarette temperature is thin than downside.
Because the present invention separates the recovery and the utilization of the waste heat of flue gas, gas cooler and waste-heat recovery device split are arranged.When temperature is low, the waste heat that reclaims is used for heats cold air raising boiler inlet temperature, play the effect of steam air heater.When temperature is higher, the fume afterheat that reclaims is used to heat low pressure feed water.Feed-water heater is placed on outside the flue, and the heat exchange that can pass through circulatory mediator (water) realizes reducing the exhaust gas temperature purpose, can avoid again guaranteeing unit safety operation because heating surface leaks the safety problem that causes.
Description of drawings
Fig. 1 is an overall structure schematic diagram of the present invention;
1 is back-end ductwork among the figure, 2 is gas cooler, and 3 is the inlet header case, and 4 are outlet collection case, 5 is water circulating pump, 6 is the feed-water heater gate valve, and 7 is air heater, and 8 is the air heater gate valve, 9 is the air channel, 10～12 for low-pressure heater divides water regulating valve, and 13 is the UTILIZATION OF VESIDUAL HEAT IN guide valve, and 14 is feed-water heater.
The specific embodiment
Below in conjunction with accompanying drawing structural principle of the present invention and operation principle are described in further detail.
Referring to Fig. 1, the present invention includes the gas cooler 2 that is arranged in air preheater (perhaps deduster) corrosion of the sulfuric-resisting in the back-end ductwork 1 afterwards, be arranged in feed-water heater 14 and air heater 7 outside the back-end ductwork 1, said gas cooler 2 is through inlet header case 3, the outlet of outlet collection case 4 and feed-water heater 14 and the inlet formation enclosed heat-exchanging loop that is connected, and on the entrance pipe of outlet collection case 4 and feed-water heater 14, be disposed with water circulating pump 5 and UTILIZATION OF VESIDUAL HEAT IN guide valve 13, the inlet of said air heater 7 is connected with UTILIZATION OF VESIDUAL HEAT IN guide valve 13, the outlet of air heater 7 is connected with inlet header case 3 by the road, and the export pipeline at air heater 7 and feed-water heater 14 is separately installed with air heater gate valve 8 and feed-water heater gate valve 6, feed-water heater 14 is arranged in parallel with low-pressure heater, and also is provided with low-pressure heater divides water regulating valve on low-pressure heater and pipeline that feed-water heater is connected.
Circulatory mediator (water) enters gas cooler 2 by inlet collection case 3 under the effect of water circulating pump 5, temperature raises behind the fume afterheat in the absorption back-end ductwork 1, flows out through outlet collection case 4.When environment temperature is higher (for example in summer), guide valve 13 switches to the heated feed water state, air heater gate valve 8 complete shut-downs, feed-water heater gate valve 6 standard-sized sheets.The high temperature circulation medium (water) that flows out through outlet collection case 4 enters feed-water heater 14, and beginning is next after discharging the heat that absorbs in gas cooler 2 to low pressure feed water circulates.Condensate water enters feed-water heater 14 through undue water regulating valve 10,11,12, absorbs the heat that circulatory mediator (water) discharges, and temperature enters oxygen-eliminating device after raising.Divide water regulating valve 10,11,12 can change the branch water ratio of (1#, 2#, 3#) at different levels low-pressure heater, be optimized adjusting according to practical operation situation.When environment temperature is low (for example in the winter time), guide valve 13 switches to the heats cold air condition, air heater gate valve 8 standard-sized sheets, feed-water heater gate valve 6 complete shut-downs.The high temperature circulation medium (water) that flows out through outlet collection case 4 enters air heater 7, and the heat that absorbs in gas cooler 2 is discharged to beginning next circulation after the air-supply, enters air preheater after the cold air temperature raises and continues heating.
The present invention utilizes water as heat catalysis, make water heat temperature raising in gas cooler, reduce exhaust gas temperature, the heat that in another heat exchanger water is absorbed in gas cooler discharges, and is used to heat main condensate to improve low pressure feed water temperature or heats cold air to improve boiler inlet temperature.Thereby reduce the amount of drawing gas of heat regenerative system, improve unit generation and exert oneself, reduce gross coal consumption rate, improve the economy of unit operation, energy savings.
During actual motion,, can control the gas cooler wall temperature by the refrigerant flow rate that water circulating pump is regulated in the circulatory system, to satisfy the requirement that unit varying duty and ature of coal change along with the variation of exhaust gas temperature.Because the gas cooler tube panel adopts anti-cold end corrosion steel to make, and can drop to reduced levels to exhaust gas temperature, and arranges according to cigarette temperature distribution density, can make full use of smoke discharging residual heat.
Claims (3)
1. hydrophily formula boiler exhaust gas heat recovery device, it is characterized in that: comprise being arranged in the gas cooler (2) in the back-end ductwork (1) after air preheater or the deduster, be arranged in feed-water heater (14) and air heater (7) outside the back-end ductwork (1) after the air preheater, said gas cooler (2) is through inlet header case (3), the outlet of outlet collection case (4) and feed-water heater (14) and the inlet formation enclosed heat-exchanging loop that is connected, and on the entrance pipe of outlet collection case (4) and feed-water heater (14), be disposed with water circulating pump (5) and UTILIZATION OF VESIDUAL HEAT IN guide valve (13), the inlet of said air heater (7) is connected with UTILIZATION OF VESIDUAL HEAT IN guide valve (13), the outlet of air heater (7) is connected with inlet header case (3) by the road, and the export pipeline at air heater (7) and feed-water heater (14) is separately installed with air heater gate valve (8) and feed-water heater gate valve (6), feed-water heater (14) and low-pressure heater are arranged in parallel, and the pipeline that is connected with feed-water heater of low-pressure heater is provided with low-pressure heater and divides water regulating valve.
2. hydrophily formula boiler exhaust gas heat recovery device according to claim 1 is characterized in that: said gas cooler (2) adopts the material of sulfuric-resisting corrosion to make.
3. hydrophily formula boiler exhaust gas heat recovery device according to claim 1 is characterized in that: the S-shaped tube panel of said gas cooler (2) arranges that according to cigarette temperature distribution density cigarette temperature upper side is close in flue (1), the cigarette temperature is thin than downside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010013655A CN101737766A (en) | 2010-01-22 | 2010-01-22 | Coal-water boiler exhaust gas residual heat recovery device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010013655A CN101737766A (en) | 2010-01-22 | 2010-01-22 | Coal-water boiler exhaust gas residual heat recovery device |
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| CN101737766A true CN101737766A (en) | 2010-06-16 |
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| CN201010013655A Pending CN101737766A (en) | 2010-01-22 | 2010-01-22 | Coal-water boiler exhaust gas residual heat recovery device |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101900347A (en) * | 2010-08-03 | 2010-12-01 | 山东泓奥电力科技有限公司 | System for high-grade recycling waste heat of smoke discharged from boiler of power station |
| CN102607011A (en) * | 2012-03-22 | 2012-07-25 | 济南达能动力技术有限责任公司 | Multi-stage utilization system for transferring exhaust afterheat energy of power station boiler |
| CN102818276A (en) * | 2011-06-10 | 2012-12-12 | 安徽省科捷再生能源利用有限公司 | Comprehensive optimized smoke discharge waste heat deep recycle system of smoke in thermal power plant |
| CN103032867A (en) * | 2011-05-19 | 2013-04-10 | 中国电力工程顾问集团华东电力设计院 | Multilevel efficient replaceable type smoke waste heat using system |
| CN103307592A (en) * | 2012-03-16 | 2013-09-18 | 尹华雷 | Low-pressure coal economizer coated by walls of boiler tail flue |
| CN104896503A (en) * | 2015-06-19 | 2015-09-09 | 东方电气集团东方锅炉股份有限公司 | Boiler smoke waste heat use system |
| CN106016328A (en) * | 2016-07-11 | 2016-10-12 | 浙江浙能嘉华发电有限公司 | Drained water recycling device and method based on heating medium water steam heater |
| CN106016326A (en) * | 2016-07-11 | 2016-10-12 | 浙江浙能嘉华发电有限公司 | Smoke waste heat recycling device and method of pipe type GGH system of smoke ultra-low emission coal-fired power generation unit |
| CN106439878A (en) * | 2016-05-17 | 2017-02-22 | 山东泓奥电力科技有限公司 | Flue gas waste heat utilizing system of condensed water heating boiler for air supply |
| CN106765265A (en) * | 2017-01-05 | 2017-05-31 | 东方电气集团东方锅炉股份有限公司 | A kind of low low temperature heat system of ultra-clean discharging fire coal unit open type |
| CN109974497A (en) * | 2019-03-19 | 2019-07-05 | 中国能源建设集团华北电力试验研究院有限公司 | It is a kind of with waste heat recycle and except coloured plume function heat accumulation peak regulation system |
| CN110094750A (en) * | 2019-06-03 | 2019-08-06 | 北京国电龙源环保工程有限公司 | A kind of coal unit low-temperature flue gas waste heat depth recycling gradient utilization system and method |
| CN116498987A (en) * | 2023-06-28 | 2023-07-28 | 国电建三江前进生物质发电有限公司 | Waste heat recovery device and method for biomass power generation |
-
2010
- 2010-01-22 CN CN201010013655A patent/CN101737766A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101900347A (en) * | 2010-08-03 | 2010-12-01 | 山东泓奥电力科技有限公司 | System for high-grade recycling waste heat of smoke discharged from boiler of power station |
| CN103032867A (en) * | 2011-05-19 | 2013-04-10 | 中国电力工程顾问集团华东电力设计院 | Multilevel efficient replaceable type smoke waste heat using system |
| CN102818276A (en) * | 2011-06-10 | 2012-12-12 | 安徽省科捷再生能源利用有限公司 | Comprehensive optimized smoke discharge waste heat deep recycle system of smoke in thermal power plant |
| CN103307592A (en) * | 2012-03-16 | 2013-09-18 | 尹华雷 | Low-pressure coal economizer coated by walls of boiler tail flue |
| CN102607011A (en) * | 2012-03-22 | 2012-07-25 | 济南达能动力技术有限责任公司 | Multi-stage utilization system for transferring exhaust afterheat energy of power station boiler |
| CN104896503A (en) * | 2015-06-19 | 2015-09-09 | 东方电气集团东方锅炉股份有限公司 | Boiler smoke waste heat use system |
| CN106439878A (en) * | 2016-05-17 | 2017-02-22 | 山东泓奥电力科技有限公司 | Flue gas waste heat utilizing system of condensed water heating boiler for air supply |
| CN106016328A (en) * | 2016-07-11 | 2016-10-12 | 浙江浙能嘉华发电有限公司 | Drained water recycling device and method based on heating medium water steam heater |
| CN106016326A (en) * | 2016-07-11 | 2016-10-12 | 浙江浙能嘉华发电有限公司 | Smoke waste heat recycling device and method of pipe type GGH system of smoke ultra-low emission coal-fired power generation unit |
| CN106765265A (en) * | 2017-01-05 | 2017-05-31 | 东方电气集团东方锅炉股份有限公司 | A kind of low low temperature heat system of ultra-clean discharging fire coal unit open type |
| CN109974497A (en) * | 2019-03-19 | 2019-07-05 | 中国能源建设集团华北电力试验研究院有限公司 | It is a kind of with waste heat recycle and except coloured plume function heat accumulation peak regulation system |
| CN110094750A (en) * | 2019-06-03 | 2019-08-06 | 北京国电龙源环保工程有限公司 | A kind of coal unit low-temperature flue gas waste heat depth recycling gradient utilization system and method |
| CN116498987A (en) * | 2023-06-28 | 2023-07-28 | 国电建三江前进生物质发电有限公司 | Waste heat recovery device and method for biomass power generation |
| CN116498987B (en) * | 2023-06-28 | 2023-12-22 | 国电建三江前进生物质发电有限公司 | Waste heat recovery device and method for biomass power generation |
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Open date: 20100616 |