CN102230615B - Combined type flue gas residual heat comprehensive utilization system - Google Patents

Combined type flue gas residual heat comprehensive utilization system Download PDF

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Publication number
CN102230615B
CN102230615B CN2011101658414A CN201110165841A CN102230615B CN 102230615 B CN102230615 B CN 102230615B CN 2011101658414 A CN2011101658414 A CN 2011101658414A CN 201110165841 A CN201110165841 A CN 201110165841A CN 102230615 B CN102230615 B CN 102230615B
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CN
China
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low
gas cooler
pipeline
delivery port
water inlet
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CN2011101658414A
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Chinese (zh)
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CN102230615A (en
Inventor
肖平
时正海
吕海生
江建忠
钟犁
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中国华能集团清洁能源技术研究院有限公司
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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
    • Y02E20/30Technologies for a more efficient combustion or heat usage

Abstract

The invention discloses a combined type flue gas residual heat comprehensive utilization system. A first-stage flue gas cooler and a second-stage flue gas cooler are arranged in front of and behind a dust collector respectively to realize stepped utilization of residual heat of exhaust smoke; condensed water with high entropy is heated at a flue gas high-temperature section; cold air with low entropy is heated in a flue gas low-temperature section; and a flue gas low-temperature section cooler and a flue gas high-temperature section cooler run in series. By adopting the comprehensive utilization system, the inlet water temperature level and the closed circulation water temperature level of the second-stage flue gas cooler are raised, and the risks of low-temperature corrosion and closed circulating water freezing in the flue gas cooler are decreased.

Description

A kind of Combined smoke waste heat comprehensive utilization system
Technical field
The present invention relates to fume afterheat comprehensive utilization technique field, be specifically related to a kind of Combined smoke waste heat comprehensive utilization system.
Background technology
A large amount of consumption of fossil fuel and consumption excessively rapid growth make people in a foreseeable future, have had a premonition the termination of its reserves; Use the coal fired power generation unit accounting of fossil fuel more than 70%, therefore how to reduce the emphasis that China's coal-fired power station boiler energy consumption becomes current work.Rise suddenly and sharply owing to the price of international energy in recent years, domestic coal for power generation price amount of increase is also very high, electricity power enterprise's heavy losses, and energy-saving and cost-reducing meaning highlights increasingly.Therefore, the demand that China's coal-fired power station boiler of combining closely is energy-saving and cost-reducing, the exhaust gas temperature that exists for station boiler generally is higher than the problem of 10~50 ℃ of design loads, and comprehensive study utilizes the method for fume afterheat and key technology to have very large using value and prospect.According to 10 ℃ of the every risings of experience exhaust gas temperature, boiler efficiency descends 0.5%, and standard net coal consumption rate rising 2g/kWh calculates, and the economic outlook that fume afterheat utilizes is very considerable.A considerable amount of station boilers adopt sack cleaner, too high life-span and the security of operation that is unfavorable for sack cleaner of exhaust gas temperature, and an urgent demand reduces exhaust gas temperature.When rotary regenerative air heater moves in the winter time often since steam air heater can not put into operation and occur that the air preheater electric current is beated and the problem of cold end corrosion, an urgent demand steam air heater that puts into operation economically and safely.Therefore the smoke waste heat comprehensive utilization system of studying a kind of steam air heater and low-level (stack-gas) economizer compound action is significant for the security reliability that improves boiler operatiopn.
China's station boiler adopts low-level (stack-gas) economizer to utilize fume afterheat and the solution boiler air preheater cold end corrosion of application steam air heater and stifled ash more extensive, but there is following shortcoming in it:
1) adopt auxiliary steam to serve as the steam air heater thermal source, heat-economy is reducing as a rule, and especially the steam air heater parameter was selected not at that time, will significantly reduce.After its former because steam air heater temperature rise surpassed critical temperature rise, it caused that the heat loss of exhaust gas temperature rising will be greater than the backheat income of steam air heater.
2) gas cooler in the low-level (stack-gas) economizer system is placed in the back-end ductwork behind the air preheater, limit by the space, and it is limited that exhaust gas temperature reduces amplitude; Gas cooler is that feed-water heater directly is placed in the flue, and there is the risk of cold end corrosion and wearing and tearing in flue work inclement condition, in case the situation that gas cooler is revealed occurs, will have a strong impact on the boiler water system security of operation.
And application number is in the utility model patent of 201020020529.7 " a kind of coal-water boiler exhaust gas residual heat recovery device ", there are two closed cycles in this device, and one is imported and exported header, water circulating pump, gate valve, UTILIZATION OF VESIDUAL HEAT IN guide valve and feed-water heater by gas cooler, gas cooler and formed; It two is imported and exported header, water circulating pump, gate valve, UTILIZATION OF VESIDUAL HEAT IN guide valve and air heater by gas cooler, gas cooler and forms.When summer, first closed cycle operation, closed-type circulating cooling water is discharged in feed-water heater by the heat that absorbs in the gas cooler, and the cooling medium in the feed-water heater is the low pressure feed water of pressing heater from the third constellations, and the low pressure feed water that has absorbed heat in feed-water heater enters oxygen-eliminating device; In the time of in the winter time, second closed cycle operation, the heat that closed cycle water will absorb in gas cooler discharges in air heater, reaches the purpose that improves boiler cold wind temperature, prevents the air preheater cold end corrosion.Two cyclic switchings realize that by gate valve and UTILIZATION OF VESIDUAL HEAT IN guide valve switch there is following shortcoming in it:
1) system has adopted face formula heat exchanger, has increased the boiler water system safety in operation, but has reduced system's heat-economy.
2) gas cooler divides heating boiler feedwater and two operating mode operations of cold air, and when the heats cold air, face formula heat exchanger does not come into operation, and number is low when utilizing.
3) can not realize that heating boiler feeds water and two operating modes of cold air are moved simultaneously, controllability is poor.
Summary of the invention
The deficiency that exists in order to overcome above-mentioned prior art, the object of the present invention is to provide a kind of Combined smoke waste heat comprehensive utilization system, power plant's high fume temperature and the large economic problems of flue gas loss have been solved, also solved the safety problem that affects the sack cleaner operation because of high fume temperature, and solved that number is low when utilizing utilizing that auxiliary steam heating steam air heater is not thrown, face formula heat exchanger does not come into operation, heat-economy is poor even caused the problem of air preheater cold end corrosion, also have in addition the advantage that can regulate.
In order to achieve the above object, the technical solution adopted in the present invention is:
A kind of Combined smoke waste heat comprehensive utilization system, comprise the air preheater 1 with air outlet slit and smoke inlet, the air intake of air preheater 1 is located on after the air preheater 1 and the air outlet that is arranged in the steam air heater 7 in the air channel is connected by pipeline, the exhanst gas outlet of described air preheater 1 is with the smoke inlet that is arranged in the first order gas cooler 6 in the back-end ductwork, the exhanst gas outlet of first order gas cooler 6 with the dust mouth of the dust inlet of deduster 9 and deduster 9 with being connected by pipeline respectively with exhanst gas outlet and the smoke inlet that is arranged in the second level gas cooler 10 in the back-end ductwork, the delivery port of second level gas cooler 10 and water inlet are connected by the pipeline with switching gate valve 13 with water inlet and the delivery port of steam air heater 7 respectively, device for cleaning pipeline between the water inlet of the delivery port of second level gas cooler 10 and steam air heater 7 is crossed with the pipeline that switches gate valve 13 and is connected with water inlet and delivery port with the water supply tank 8 of water supplement port, pipeline between the delivery port of the water inlet of second level gas cooler 10 and steam air heater 7 also is provided with the first closed cold pump 11, the delivery port of second level gas cooler 10 is by also being connected with the water inlet of first order gas cooler 6 with the pipeline that switches gate valve 13, the delivery port of first order gas cooler 6 is connected with the water inlet with the oxygen-eliminating device 2 of bleeding point and delivery port, and the water inlet of oxygen-eliminating device 2 also is connected with the first low delivery port of 3 of adding with front air intake, the first low water inlet of 3 of adding is with lowly adding 4 delivery port and the second low water inlet of 4 of adding is connected by pipeline with the 3rd low 5 the delivery port of adding with front air intake with second of front air intake, first low adds 3 venthole and the second low air intake of 4 of adding is connected by pipeline, second low adds 4 venthole and the 3rd low 5 the air intake of adding is connected by pipeline, the first low delivery port of 3 of adding lowly adds 4 water inlet and the second low 4 venthole and the 3rd low device for cleaning pipeline that adds between 5 the air intake of adding crossed with the water inlet of the pipeline that switches gate valve 13 and be provided with the second closed cold pump 12 with second level gas cooler 10 and be connected with second, and the pipeline between the water inlet of the delivery port of second level gas cooler 10 and first order gas cooler 6 is crossed switching gate valve 13 with the device for cleaning pipeline that is provided with the second closed cold pump 12 and is connected.
The wall temperature of heated surface of described first order gas cooler 6 and second level gas cooler 10 is higher than 15 ℃ of acid dew-point temperatures, adopts corrosion resisting steel in low-temperature zone simultaneously.
By arranging respectively first order gas cooler 6 and second level gas cooler 10 in deduster 9 front and back, form the smoke discharging residual heat cascade utilization, the fume high-temperature section adds the high condensate water of showing tremendous enthusiasm merchant, and the flue gas low-temperature section adds the low cold air of showing tremendous enthusiasm merchant; Flue gas low-temperature section cooler and the series operation of fume high-temperature section cooler have improved inlet water temperature and the closed cycle coolant-temperature gage level of second level gas cooler 10, have reduced the risk that gas cooler generation cold end corrosion and closed cycle water-ice freeze.
Description of drawings
Accompanying drawing is operation principle structural representation of the present invention.
The specific embodiment
The present invention will be described in more detail below in conjunction with accompanying drawing.
As shown in drawings, Combined smoke waste heat comprehensive utilization system, comprise the air preheater 1 with air outlet slit and smoke inlet, the air intake of air preheater 1 is located on after the air preheater 1 and the air outlet with the steam air heater 7 of air inlet that is arranged in the air channel is connected by pipeline, the exhanst gas outlet of described air preheater 1 is with the smoke inlet that is arranged in the first order gas cooler 6 in the back-end ductwork, the exhanst gas outlet of first order gas cooler 6 with the dust mouth of the dust inlet of deduster 9 and deduster 9 with being connected by pipeline respectively with exhanst gas outlet and the smoke inlet that is arranged in the second level gas cooler 10 in the back-end ductwork, the delivery port of second level gas cooler 10 and water inlet are connected by the pipeline with switching gate valve 13 with water inlet and the delivery port of steam air heater 7 respectively, device for cleaning pipeline between the water inlet of the delivery port of second level gas cooler 10 and steam air heater 7 is crossed with the pipeline that switches gate valve 13 and is connected with water inlet and delivery port with the water supply tank 8 of water supplement port, pipeline between the delivery port of the water inlet of second level gas cooler 10 and steam air heater 7 also is provided with the first closed cold pump 11, the delivery port of second level gas cooler 10 is by also being connected with the water inlet of first order gas cooler 6 with the pipeline that switches gate valve 13, the delivery port of first order gas cooler 6 is connected with the water inlet with the oxygen-eliminating device 2 of air intake and delivery port, and the water inlet of oxygen-eliminating device 2 also is connected with the first low delivery port of 3 of adding with front air intake, the first low water inlet of 3 of adding is with lowly adding 4 delivery port and the second low water inlet of 4 of adding is connected by pipeline with the 3rd low 5 the delivery port of adding with front air intake with second of front air intake, first low adds 3 venthole and the second low rear air intake of 4 of adding is connected by pipeline, second low adds 4 venthole and the 3rd low 5 the rear air intake of adding is connected by pipeline, the first low delivery port of 3 of adding lowly adds 4 water inlet and the second low 4 venthole and the 3rd low device for cleaning pipeline that adds between 5 the air intake of adding crossed with the water inlet of the pipeline that switches gate valve 13 and be provided with the second closed cold pump 12 with second level gas cooler 10 and be connected with second, and the pipeline between the water inlet of the delivery port of second level gas cooler 10 and first order gas cooler 6 is crossed switching gate valve 13 with the device for cleaning pipeline that is provided with the second closed cold pump 12 and is connected.The wall temperature of heated surface of described first order gas cooler 6 and second level gas cooler 10 is higher than 15 ℃ of acid dew-point temperatures, adopts corrosion resisting steel in low-temperature zone simultaneously.
Operation principle of the present invention is: under the low operating mode of temperature, by the 3rd low 5 the water inlet importing low pressure feed water that adds, water supplement port by water supply tank 8 imports the condensate water moisturizing, air inlet by steam air heater 7 imports cold air, smoke inlet by air preheater 1 imports flue gas, air intake by oxygen-eliminating device 2 draws gas, drawn gas by the first low front air intake of 3 of adding, second low adds that 4 front air intake draws gas and the 3rd low 5 the front air intake of adding draws gas, open pipeline between the water inlet of the delivery port of second level gas cooler 10 and first order gas cooler 6 with the switching gate valve 13 of the pipeline enclosure setting of the second closed cold pump 12 and close import and export gate valve and the second closed cold pump 12 that enters second level gas cooler 10, send into first order gas cooler 6 by air preheater 1 preheating flue gas, and low pressure feed water low add 5 and second and lowly adds 4 enter into first order gas cooler 6 under the effect of drawing gas by the 3rd, be sent to second level gas cooler 10 after sending into deduster 9 dedustings after the preheating flue gas is cooled off by low pressure feed water, and the condensate water moisturizing is sent into second level gas cooler 10 via water supply tank 8, flue gas output behind second level gas cooler 10 cooling and dedustings, and the condensate water moisturizing in the second level gas cooler 10 via in the steam air heater 7 by chilled air cools, and turn back to water supply tank 8 circulation and send water, cold air is sent to by steam air heater 7 and derives after air preheater 1 forms hot-air, condensate water moisturizing after the heating is returned first and low is added 3 thus, at this moment stop the second closed cold pump 12, and open pipeline between the water inlet of the delivery port of second level gas cooler 10 and first order gas cooler 6 with the switching gate valve 13 that the pipeline enclosure of the second closed cold pump 12 arranges, close the gate valve that arranges on the pipeline between the water inlet of the delivery port of second level gas cooler 10 and first order gas cooler 6.
Under the high operating mode of temperature, by the 3rd low 5 the water inlet importing low pressure feed water that adds, water supplement port by water supply tank 8 imports the condensate water moisturizing, air inlet by steam air heater 7 imports cold air, smoke inlet by air preheater 1 imports flue gas, air intake by oxygen-eliminating device 2 draws gas, drawn gas by the first low front air intake of 3 of adding, second low adds that 4 front air intake draws gas and the 3rd low 5 the front air intake of adding draws gas, close the stop valve between second level gas cooler 10 and the steam air heater 7, close the switching gate valve 13 that the pipeline between the water inlet of first order gas cooler 6 arranges with the pipeline enclosure of the second closed cold pump 12, close the first closed cold pump 11, and open other switching gate valve, the second closed cold pump 12, send into first order gas cooler 6 by air preheater 1 preheating flue gas, and low pressure feed water low add 5 and second and lowly adds 4 enter into second level gas cooler 10 under the effect of drawing gas by the 3rd, be sent to first order gas cooler 6 after the low pressure feed water heat absorption, then be sent in the oxygen-eliminating device 2.And the condensate water moisturizing is stopped using.
Under usual operating mode, by the 3rd low 5 the water inlet importing low pressure feed water that adds, water supplement port by water supply tank 8 imports the condensate water moisturizing, air inlet by steam air heater 7 imports cold air, smoke inlet by air preheater 1 imports flue gas, air intake by oxygen-eliminating device 2 draws gas, drawn gas by the first low front air intake of 3 of adding, second low adds that 4 front air intake draws gas and the 3rd low 5 the front air intake of adding draws gas, close pipeline between the water inlet of the delivery port of second level gas cooler 10 and first order gas cooler 6 with the switching gate valve 13 of the pipeline enclosure setting of the second closed cold pump 12 and open other gate valve, the first closed cold pump 11 and the second closed cold pump 12, send into first order gas cooler 6 by air preheater 1 preheating flue gas, and low pressure feed water low add 5 and second and lowly adds 4 enter into first order gas cooler 6 under the effect of drawing gas by the 3rd, be sent to second level gas cooler 10 after sending into deduster 9 dedustings after the preheating flue gas is cooled off by low pressure feed water, and the condensate water moisturizing is sent into second level gas cooler 10 via water supply tank 8, flue gas output behind second level gas cooler 10 cooling and dedustings, and the condensate water moisturizing in the second level gas cooler 10 via in the steam air heater 7 by chilled air cools, and turn back to water supply tank 8 circulation and send water, cold air is sent to by steam air heater 7 and derives after air preheater 1 forms hot-air, condensate water moisturizing after the heating is returned first and low is added 3 thus, at this moment open the second closed cold pump 12, and close the switching gate valve 13 that the pipeline between the water inlet of the delivery port of second level gas cooler 10 and first order gas cooler 6 arranges with the pipeline enclosure of the second closed cold pump 12.

Claims (2)

1. Combined smoke waste heat comprehensive utilization system, comprise the air preheater (1) with air outlet slit and smoke inlet, it is characterized in that: the air outlet that the air intake of air preheater (1) is located on air preheater (1) afterwards and is arranged in the steam air heater (7) in the air channel is connected by pipeline, the exhanst gas outlet of described air preheater (1) is with the smoke inlet that is arranged in the first order gas cooler (6) in the back-end ductwork, the dust inlet of the same deduster of exhanst gas outlet (9) of first order gas cooler (6) and the dust mouth of deduster (9) are with being connected by pipeline respectively with exhanst gas outlet and the smoke inlet that is arranged in the second level gas cooler (10) in the back-end ductwork, the delivery port of second level gas cooler (10) and water inlet respectively water inlet and the delivery port of same steam air heater (7) are connected by the pipeline with switching gate valve (13), device for cleaning pipeline between the water inlet of the delivery port of second level gas cooler (10) and steam air heater (7) is crossed with the pipeline that switches gate valve (13) and is connected with water inlet and delivery port with the water supply tank (8) of water supplement port, pipeline between the delivery port of the water inlet of second level gas cooler (10) and steam air heater (7) also is provided with the first closed cold pump (11), the delivery port of second level gas cooler (10) is by also being connected with the water inlet of first order gas cooler (6) with the pipeline that switches gate valve (13), the delivery port of first order gas cooler (6) is connected with the water inlet with the oxygen-eliminating device (2) of bleeding point and delivery port, and the water inlet of oxygen-eliminating device (2) also is connected with the first low delivery port that adds (3) with front air intake, the first low water inlet that adds (3) is connected by pipeline with the 3rd low delivery port that adds (5) with front air intake with the second low delivery port and the second low water inlet that adds (4) that adds (4) with front air intake, the first low venthole and the second low air intake that adds (4) that adds (3) is connected by pipeline, the second low venthole and the 3rd low air intake that adds (5) that adds (4) is connected by pipeline, the first low delivery port that adds (3) is crossed with the water inlet of the pipeline that switches gate valve (13) and be provided with the second closed cold pump (12) with second level gas cooler (10) with the device for cleaning pipeline between the second low water inlet that adds (4) and the second low venthole that adds (4) and the 3rd low air intake that adds (5) and is connected, and the pipeline between the water inlet of the delivery port of second level gas cooler (10) and first order gas cooler (6) is crossed switching gate valve (13) with the device for cleaning pipeline that is provided with the second closed cold pump (12) and is connected.
2. Combined smoke waste heat comprehensive utilization system according to claim 1, it is characterized in that: the wall temperature of heated surface of first order gas cooler (6) and second level gas cooler (10) is higher than 15 ℃ of acid dew-point temperatures, adopts corrosion resisting steel in low-temperature zone simultaneously.
CN2011101658414A 2011-06-20 2011-06-20 Combined type flue gas residual heat comprehensive utilization system CN102230615B (en)

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Publication number Priority date Publication date Assignee Title
CN102494329B (en) * 2011-12-21 2014-02-12 王俊杰 Device for utilizing flue gas waste heat of boiler comprehensively
CN102494330A (en) * 2011-12-21 2012-06-13 王俊杰 Comprehensive utilization device for flue gas waste heat of boiler by using heat pipe technology
CN104006401B (en) * 2013-11-04 2016-02-10 成信绿集成股份有限公司 The degree of depth of boiler of power plant fume afterheat is recycled and emission-reducing system
CN104406186A (en) * 2014-11-27 2015-03-11 上海理工大学 Flue gas water recycling system
CN105180146B (en) * 2015-08-12 2017-06-27 中国华能集团清洁能源技术研究院有限公司 A kind of cogeneration power plant fume afterheat is multistage to reclaim utilization system
CN109442379A (en) * 2018-10-09 2019-03-08 中国神华能源股份有限公司 Flue gas waste heat recovery system and boiler system

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