CN202885075U - Device directly utilizing power station discharge smoke waste heat to supply heat - Google Patents

Device directly utilizing power station discharge smoke waste heat to supply heat Download PDF

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Publication number
CN202885075U
CN202885075U CN2012205458402U CN201220545840U CN202885075U CN 202885075 U CN202885075 U CN 202885075U CN 2012205458402 U CN2012205458402 U CN 2012205458402U CN 201220545840 U CN201220545840 U CN 201220545840U CN 202885075 U CN202885075 U CN 202885075U
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China
Prior art keywords
heat
heat supply
heater
condensation water
boiler
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Expired - Fee Related
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CN2012205458402U
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Chinese (zh)
Inventor
周宏定
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Nanjing Guolian Electric Power Engineering Design Co Ltd
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Nanjing Guolian Electric Power Engineering Design Co Ltd
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Priority to CN2012205458402U priority Critical patent/CN202885075U/en
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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
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/34Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
    • 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
    • Y02P80/00Climate change mitigation technologies for sector-wide applications
    • Y02P80/10Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
    • Y02P80/15On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply

Abstract

The utility model relates to an energy-saving device of waste heat of power station discharge smoke, in particular to a device directly utilizing power station discharge smoke waste heat to supply heat. The device directly utilizing the power station discharge smoke waste heat to supply the heat comprises an air preheating system and a condensation water heating system, wherein the air preheating system is formed by connecting a boiler primary air fan, a thionizer, a chimney and a boiler air pre-heater through pipelines, and the condensation water heating system is formed by connecting an electrostatic precipitator, a condensate pump, an eighth low pressure heater, a seventh low pressure heater, a sixth low pressure heater, a fifth low pressure heater and a deaerator through the pipelines. The device directly utilizing the power station discharge smoke waste heat to supply the heat is characterized in that a condensation water heater and a heat supply network backwater heater are connected between the air preheating system and the condensation water heating system through the pipelines in parallel. The device directly utilizing the power station discharge smoke waste heat to supply the heat is simple and unique in structure, unit swept volume and power generation steam consumption can be greatly reduced by reducing discharge smoke temperature, so that electricity generation coal consumption is saved, discharge smoke heat is effectively recycled and utilized, boiler discharge smoke loss is reduced, and boiler efficiency is improved.

Description

A kind of device that directly utilizes power plant smoke discharging residual heat heat supply
Technical field
The utility model relates to the energy saver of a kind of power plant smoke discharging residual heat, especially relates to a kind of device that directly utilizes power plant smoke discharging residual heat heat supply.
Background technology
Generation current factory exhaust gas temperature is higher, has had a strong impact on the economy of boiler operatiopn, generally speaking, 10 ℃ of the every risings of exhaust gas temperature, flue gas loss increases by 0.5~0.8%.General power plant boiler exhaust gas temperature is at 130 ℃~140 ℃, high fume temperature causes the power plant efficiency of utilization to reduce, because the corrosion of metal wall when flue-gas temperature is lower than acid dew point, so causing the smoke evacuation heat in power plant can't utilize, cause occurring following problem: 1) steam power plant is large in heat supply phase machine assembly air-exhausting amount, and generated energy reduces by 30%; 2) boiler exhaust gas heat can't be utilized, and flue gas loss is the heat loss of boiler maximum, and exhaust gas temperature reduces the cold end corrosion of making back-end surfaces when boiler at low load operation or winter operation in addition; 3) be the heating low pressure feed water, the thermal efficiency that improves unit will expend a large amount of steam turbines and draw gas; High-temperature flue gas enters and produces a large amount of steam in the desulfurizing tower, and when exhaust gas temperature was higher, water vapour can not condensation be emitted heat, and with fume emission, smoke evacuation heat is wasted; 4) high-temperature flue gas is also taken away a large amount of sensible heats, forms together larger flue gas loss, and the high temperature desulfurizing water consumption is quite serious simultaneously; Also there is not at present result of the above problems.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, a kind of uniqueness simple in structure is provided, can reduces in a large number machine assembly air-exhausting amount, the generating steam consumption by reducing exhaust gas temperature, thereby saving gross coal consumption rate, smoke evacuation heat by effective recycling, reduced the boiler exhaust gas loss, improved a kind of device that directly utilizes power plant smoke discharging residual heat heat supply of boiler efficiency.
The utility model is realized in the following way:
A kind of device that directly utilizes power plant smoke discharging residual heat heat supply, it comprises the air preheating system that is formed by connecting by pipeline by boiler primary air fan, desulfurizing tower, chimney and boiler air preheater, by electric precipitation, condensate pump, No. eight lowly add, lowly add for No. seven, lowly add for No. six, lowly add for No. five, oxygen-eliminating device is by the condensation water heating system that pipeline is formed by connecting, it is characterized in that: between above-mentioned air preheating system and condensation water heating system, be parallel with a condensation water heater and a heat supply network backwater heater by pipeline;
Between described air preheater and electric precipitation, be equiped with a flue gas attemperator;
A flue gas condenser is installed before described desulfurizing tower exhanst gas outlet;
Be connected with successively the heat supply network feed-water heater at an end of described heat supply network backwater heater by pipeline and supply water with heat supply network and link to each other, the other end is connected with the heat supply network backwater;
One end of described condensation water heater by pipeline low add with described No. eight successively, lowly add for No. seven, lowly add for No. six, No. five low adding link to each other, the other end links to each other with described condensate pump;
Described condensation water heater and a heat supply network backwater heater are the anti-corrosion heater.
The utility model has following effect:
1) structure is unique: the utility model is to be parallel with two anti-corrosion heat exchangers by pipeline between existing air preheating system and condensation water heating system, one of them is heat supply network backwater heater, the heat supply unit utilizes heat supply network return water temperature of flue-gas temperature heating in the winter time between heating period, a heat supply network backwater after the intensification again is heated to qualified temperature to heat supply network and supplies water entering former heat supply network feed-water heater.Another one is condensation water heater, can be between non-heating period or non-heat supply unit adopt with flue-gas temperature heat-setting water supply water temperature, replace 7, No. 8 and low add work, the condensate water after the intensification enters former 5, No. 6 low adding and again is heated to 140 ℃ of qualified temperature to oxygen-eliminating device and supplies water.
2) control too high exhaust gas temperature: enter air preheater after wind-warm syndrome is increased to 50 ℃~60 ℃ behind the flue gas condenser in a wind process of the device that the utility model the provides desulfurizing tower, to cause that exhaust gas temperature is corresponding to be increased to 170 ℃~180 ℃, too high in order to control exhaust gas temperature, air preheater between the electric precipitation installing flue gas attemperator, with high-temperature flue gas heat-setting water, make flue-gas temperature be reduced in 130 ℃~140 ℃ and enter again electric precipitation, reach the purpose of the too high exhaust gas temperature of control.The condensate water that the reduction flue gas is used is taken from No. seven low low pressure that add and hang down for No. six between adding and is supplied water, according to suitable adjusting of flue-gas temperature circumstances flue-gas temperature is controlled between 130-140 ℃, simultaneously, the condensate water after the heating enters oxygen-eliminating device, saves low drawing gas of adding 5, No. 6.
3) reduce exhaust gas temperature: because flue gas still has 90 ℃ temperature after entering the desulfurizing tower desulfurization, simultaneously with a large amount of steam, therefore a flue gas condenser is installed before the exhanst gas outlet in desulfurizing tower, this condenser adopts the air cooling, cooling medium goes out one's intention as revealed in what one says from the boiler primary air fan, primary air fan go out one's intention as revealed in what one says through flue gas condenser the desulfurizing tower exhaust gas temperature is down to be higher than 5 ℃ of environment temperatures, the reduction of desulfurizing tower exhaust gas temperature make with water vapour condensed in a large number that to be recycled to desulfurizing tower recycling.Simultaneously, go out from the boiler primary air fan and to enter boiler air preheater after one's intention as revealed in what one says is heated, because a wind EAT improves, boiler efficiency also will improve, exhaust gas temperature must raise simultaneously, therefore must control exhaust gas temperature with the flue gas attemperator.
4) because a large amount of recovery smoke exhaust heat of heat supply network backwater heater, thus the heat supply of saving in a large number steam turbine draw gas with six sections, the minimizing of heating period machine assembly air-exhausting amount can keep higher generated energy.
5) because a large amount of recovery smoke exhaust heat of condensation water heater, draw gas thereby save in a large number 7 sections and 8 sections of steam turbine, reduce in a large number the machine assembly air-exhausting amount, can reduce in a large number the generating steam consumption, thus the saving gross coal consumption rate.
6) owing to reduced exhaust gas temperature, smoke evacuation heat has been reduced the boiler exhaust gas loss by effective recycling, has improved boiler efficiency.
7) owing to the reduction of exhaust gas temperature, flue gas enters a large amount of generation steam that reduce in the desulfurizing tower, and water-saving result is obvious, will improve desulfurized effect after the flue gas reduction, and the condition with better desulphurizing ability is: 90 ℃ of reaction temperatures, smoke moisture 80%.
8) wind through flue gas condenser in the desulfurizing tower after wind-warm syndrome be increased to 50 ℃~60 ℃ and will cause the corresponding 170-180 of being increased to of exhaust gas temperature ℃.The flue gas attemperator can utilize this part smoke evacuation heat, draw from No. 5 low entrance condensate water that add with the high-temperature flue gas heating, condensate water after the intensification enters the oxygen-eliminating device utilization, can replace partly or entirely like this that No. 5 and No. 6 are low to add work, a large amount of 5 sections and 6 sections of saving steam turbine draw gas, further save and reduce the generating steam consumption, boiler efficiency will improve 8% gross coal consumption rate will reduce by 5%.9) because flue gas attemperator flexible adjustment, behind the flue gas process flue gas attemperator, flue-gas temperature can be controlled in the critical field enter again electric precipitation between 130 ℃~140 ℃, the cold end corrosion of back-end surfaces when effectively preventing boiler at low load operation or winter operation has effectively prevented exhaust gas temperature superelevation harm equipment.
Description of drawings
Fig. 1 is structural representation of the present utility model.
The specific embodiment
The utility model relates to a kind of device that directly utilizes power plant smoke discharging residual heat heat supply, it comprises by boiler primary air fan 14, desulfurizing tower 4, the air preheating system 20 that chimney 17 and boiler air preheater 16 are formed by connecting by pipeline, by electric precipitation 1, condensate pump 8, hang down for No. eight and add 9, hang down for No. seven and add 10, hang down for No. six and add 11, hang down for No. five and add 12, the condensation water heating system 21 that oxygen-eliminating device 13 is formed by connecting by pipeline, as shown in Figure 1: between above-mentioned air preheating system 20 and condensation water heating system 21, be parallel with a condensation water heater 2 and a heat supply network backwater heater 3 by pipeline, between air preheater 16 and electric precipitation 1, be equiped with a flue gas attemperator 18, before described desulfurizing tower 4 exhanst gas outlets, a flue gas condenser 15 is installed, being connected with successively heat supply network feed-water heater 6 and heat supply network at an end of described heat supply network backwater heater 3 by pipeline supplies water and 7 links to each other, the other end is connected with heat supply network backwater 5, one end of described condensation water heater 2 low adds 9 with described No. eight successively by pipeline, hang down for No. seven and add 10, hang down for No. six and add 11, No. five low adds 12 and links to each other, and the other end links to each other with described condensate pump 8.
Above-mentioned condensation water heater 2 and a heat supply network backwater heater 3 are the anti-corrosion heater.
The device heat supply unit that the utility model provides is in the heating period method of operation: as shown in Figure 1: flue gas enters heat supply network backwater heater 3 through behind the electric precipitation 1, by flue-gas temperature heating heat supply network backwater, enter desulfurizing tower after flue-gas temperature is down to 90 ℃ by 130 ℃ and carry out desulfurization; Heat supply network backwater 5 through heat supply network backwater heaters 3 after temperature be increased to 100 ℃~120 ℃, ℃ enter heat supply network and supply water entering heat supply network feed-water heater 6 heating heat supply network backwater to 130; Flue gas enters that the flue gas with a large amount of steam can reach 90 ℃ after desulfurizing tower 4 desulfurization, be recovered in the desulfurizing tower after a large amount of steam is condensed into water in through flue gas behind the flue gas condenser 15 and recycle, flue gas is condensed to be cooled to and enters chimney 17 after being higher than 5 ℃ of ambient wind temperature; The cooling medium of flue gas condenser comes from the air feed of boiler primary air fan, and the air feed of boiler primary air fan enters boiler air preheater after being heated to 50-60 ℃ by flue gas condenser behind the flue gas condenser; Because air temperature improves, the efficiency of utilization of boiler is improved, and exhaust gas temperature also is increased to 180 ℃ simultaneously, for preventing the exhaust gas temperature superelevation, at boiler air preheater 16 to a flue gas attemperator 18 is installed between the electric precipitation 1; Temperature is down to 130 ℃~140 ℃ and is entered electric precipitation 1 again behind the flue gas process flue gas attemperator 18, the cooling medium of flue gas attemperator 18 derives from No. six low low pressure that add between No. seven low adding 95 ℃ and supplies water, and entering oxygen-eliminating device 13 after being warming up to 140 ℃ through flue gas attemperator 18.
The non-heat supply unit of the device that the utility model provides or heat supply unit are in the non-heating period method of operation: as shown in Figure 1: flue gas enters condensation water heater 2 through behind the electric precipitation 1, by flue-gas temperature heat-setting water, enter desulfurizing tower after flue-gas temperature is down to 90 ℃ by 130 ℃ and carry out desulfurization; Condensate water is increased to 100 ℃~120 ℃ from condensate pump 8 through temperature behind the condensation water heaters 2, lowly adds 11 and No. five and lowly adds 12 and enter oxygen-eliminating device again entering No. six, stops using simultaneously No. eight and lowly adds 9 and No. seven and lowly add 10; Flue gas enters that the flue gas with a large amount of steam can reach 90 ℃ after desulfurizing tower 4 desulfurization, be recovered in the desulfurizing tower after a large amount of steam is condensed into water in through flue gas behind the flue gas condenser 15 and recycle, flue gas is condensed to be cooled to and enters chimney 17 after being higher than 5 ℃ of ambient wind temperature; The cooling medium of flue gas condenser comes from the air feed of boiler primary air fan, and the air feed of boiler primary air fan enters boiler air preheater after being heated to 50-60 ℃ by flue gas condenser behind the flue gas condenser; Because air temperature improves, the efficiency of utilization of boiler is improved, and exhaust gas temperature also is increased to 170 ℃~180 ℃ simultaneously, for preventing the exhaust gas temperature superelevation, at boiler air preheater 16 to a flue gas attemperator 18 is installed between the electric precipitation 1; Temperature is down to 130 ℃~140 ℃ and is entered electric precipitation 1 again behind the flue gas process flue gas attemperator 18, the cooling medium of flue gas attemperator 18 derives from No. six low low pressure that add between No. seven low adding 95 ℃ and supplies water, and entering oxygen-eliminating device 13 after being warming up to 140 ℃ through flue gas attemperator 18.
The device that the utility model provides is as shown in Figure 1: the heat supply unit also can drop into according to the size of heating load condensation water heater 2 and heat supply network backwater heater 3 simultaneously at heating period, is convenient to flexible modulation and energy savings.

Claims (6)

1. device that directly utilizes power plant smoke discharging residual heat heat supply, it comprises by boiler primary air fan (14), desulfurizing tower (4), the air preheating system (20) that chimney (17) and boiler air preheater (16) are formed by connecting by pipeline, by electric precipitation (1), condensate pump (8), No. eight low add (9), No. seven low add (10), No. six low add (11), No. five low add (12), the condensation water heating system (21) that oxygen-eliminating device (13) is formed by connecting by pipeline is characterized in that: be parallel with a condensation water heater (2) and a heat supply network backwater heater (3) by pipeline between above-mentioned air preheating system (20) and condensation water heating system (21).
2. a kind of device that directly utilizes power plant smoke discharging residual heat heat supply as claimed in claim 1 is characterized in that: be equiped with a flue gas attemperator (18) between described air preheater (16) and electric precipitation (1).
3. a kind of device that directly utilizes power plant smoke discharging residual heat heat supply as claimed in claim 1 or 2 is characterized in that: before described desulfurizing tower (4) exhanst gas outlet a flue gas condenser (15) is installed.
4. a kind of device that directly utilizes power plant smoke discharging residual heat heat supply as claimed in claim 1 or 2, it is characterized in that: an end of described heat supply network backwater heater (3) by pipeline be connected with successively heat supply network feed-water heater (6) and heat supply network supply water (7) link to each other, the other end is connected with heat supply network backwater (5).
5. a kind of device that directly utilizes power plant smoke discharging residual heat heat supply as claimed in claim 1 or 2, it is characterized in that: an end of described condensation water heater (2) low adds (9) with described No. eight successively, lowly adds (10) No. seven, lowly adds (11) No. six, lowly adds (12) and link to each other for No. five by pipeline, and the other end links to each other with described condensate pump (8).
6. a kind of device that directly utilizes power plant smoke discharging residual heat heat supply as claimed in claim 1, it is characterized in that: described condensation water heater (2) and a heat supply network backwater heater (3) are the anti-corrosion heater.
CN2012205458402U 2012-10-24 2012-10-24 Device directly utilizing power station discharge smoke waste heat to supply heat Expired - Fee Related CN202885075U (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103691259A (en) * 2013-12-11 2014-04-02 北京中能诺泰节能环保技术有限责任公司 Energy-saving and water-saving purification system for processing smoke by using wet process and energy-saving and water-saving purification process
CN106556023A (en) * 2016-11-29 2017-04-05 无锡市锡源锅炉有限公司 One kind is from smoke-exhausting type boiler exhaust gas residual neat recovering system
CN106556021A (en) * 2016-11-29 2017-04-05 无锡市锡源锅炉有限公司 A kind of boiler smoke residual neat recovering system that dirt is taken out based on timing
CN106594774A (en) * 2016-11-29 2017-04-26 无锡市锡源锅炉有限公司 Boiler discharged smoke waste heat recycling system with flue for removing smoke
CN106594775A (en) * 2016-11-29 2017-04-26 无锡市锡源锅炉有限公司 Boosting control type flue gas channel waste heat recovery system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103691259A (en) * 2013-12-11 2014-04-02 北京中能诺泰节能环保技术有限责任公司 Energy-saving and water-saving purification system for processing smoke by using wet process and energy-saving and water-saving purification process
CN106556023A (en) * 2016-11-29 2017-04-05 无锡市锡源锅炉有限公司 One kind is from smoke-exhausting type boiler exhaust gas residual neat recovering system
CN106556021A (en) * 2016-11-29 2017-04-05 无锡市锡源锅炉有限公司 A kind of boiler smoke residual neat recovering system that dirt is taken out based on timing
CN106594774A (en) * 2016-11-29 2017-04-26 无锡市锡源锅炉有限公司 Boiler discharged smoke waste heat recycling system with flue for removing smoke
CN106594775A (en) * 2016-11-29 2017-04-26 无锡市锡源锅炉有限公司 Boosting control type flue gas channel waste heat recovery system

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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20130417

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