CN102230615A - Combined type flue gas residual heat comprehensive utilization system - Google Patents
Combined type flue gas residual heat comprehensive utilization system Download PDFInfo
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- CN102230615A CN102230615A CN2011101658414A CN201110165841A CN102230615A CN 102230615 A CN102230615 A CN 102230615A CN 2011101658414 A CN2011101658414 A CN 2011101658414A CN 201110165841 A CN201110165841 A CN 201110165841A CN 102230615 A CN102230615 A CN 102230615A
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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
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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
Technical field
The present invention relates to fume afterheat comprehensive utilization technique field, be specifically related to a kind of assembled smoke gas residual heat integrative and utilize 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; How therefore the coal fired power generation unit accounting of using fossil fuel reduce the emphasis that China's coal-fired power station boiler energy consumption becomes current work more than 70%.Owing to the international energy big bulge in price, domestic coal for power generation price amount of increase is also very high in recent years, electricity power enterprise's heavy losses, and energy-saving and cost-reducing meaning highlights day by day.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 at 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 big 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 fume afterheat 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 application steam air heater solves boiler air preheater cold end corrosion and stifled ash compares extensively, 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 hydrophily formula boiler exhaust gas heat recovery device ", there are two closed cycles in this device, and one is imported and exported collection case, 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 collection case, 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 circulations are switched by gate valve and the realization of UTILIZATION OF VESIDUAL HEAT IN guide valve switch, and 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
In order to overcome the deficiency that above-mentioned prior art exists, the object of the present invention is to provide a kind of assembled smoke gas residual heat integrative to utilize system, high and the big economic problems of flue gas loss of power plant's exhaust gas temperature have been solved, also solved because of the high safety problem that influences the sack cleaner operation of exhaust gas temperature, and solved that number when utilizing utilizing that auxiliary steam heating steam air heater is not thrown, face formula heat exchanger does not come into operation is low, heat-economy difference even cause the problem of air preheater cold end corrosion, also have the advantage that can regulate in addition.
In order to achieve the above object, the technical solution adopted in the present invention is:
A kind of assembled smoke gas residual heat integrative utilizes system, comprise the air preheater 1 that has 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 is connected by pipeline respectively with the smoke inlet that has exhanst gas outlet and be arranged in the second level gas cooler 10 in the back-end ductwork with the dust mouth of the dust inlet of deduster 9 and deduster 9, the delivery port of second level gas cooler 10 and water inlet are connected by having the pipeline that switches gate valve 13 with the water inlet and the delivery port of steam air heater 7 respectively, pipeline between the water inlet of the delivery port of second level gas cooler 10 and steam air heater 7 is connected with the water inlet and the delivery port that have the water supply tank 8 of water supplement port by having the pipeline that switches gate valve 13, pipeline between the delivery port of the water inlet of second level gas cooler 10 and steam air heater 7 also is provided with first closed cold pump 11, the delivery port of second level gas cooler 10 also is connected with the water inlet of first order gas cooler 6 by having the pipeline that switches gate valve 13, the delivery port of first order gas cooler 6 is connected with the water inlet that has the oxygen-eliminating device 2 of bleeding point and delivery port, and the water inlet of oxygen-eliminating device 2 also is connected with first low 3 the delivery port of adding of air intake before having, first low 3 the water inlet of adding lowly adds 4 delivery port and second low 4 the water inlet of adding is connected by pipeline with the 3rd low 5 the delivery port of adding of air intake before having with second of air intake before having, first low adds 3 venthole and second low 4 the air intake 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, first low 3 the delivery port of adding lowly adds 4 venthole and the 3rd low pipeline that adds between 5 the air intake is connected with the water inlet of second level gas cooler 10 by having the pipeline that switches gate valve 13 and be provided with second closed cold pump 12 with second low 4 the water inlet and second that adds, and the pipeline between the water inlet of the delivery port of second level gas cooler 10 and first order gas cooler 6 is connected by switching gate valve 13 with the pipeline that is provided with second closed cold pump 12.
The heating surface wall temperature 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 first order gas cooler 6 and second level gas cooler 10 respectively 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 the 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 an 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, the assembled smoke gas residual heat integrative utilizes system, comprise the air preheater 1 that has 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 that has air inlet 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 is connected by pipeline respectively with the smoke inlet that has exhanst gas outlet and be arranged in the second level gas cooler 10 in the back-end ductwork with the dust mouth of the dust inlet of deduster 9 and deduster 9, the delivery port of second level gas cooler 10 and water inlet are connected by having the pipeline that switches gate valve 13 with the water inlet and the delivery port of steam air heater 7 respectively, pipeline between the water inlet of the delivery port of second level gas cooler 10 and steam air heater 7 is connected with the water inlet and the delivery port that have the water supply tank 8 of water supplement port by having the pipeline that switches gate valve 13, pipeline between the delivery port of the water inlet of second level gas cooler 10 and steam air heater 7 also is provided with first closed cold pump 11, the delivery port of second level gas cooler 10 also is connected with the water inlet of first order gas cooler 6 by having the pipeline that switches gate valve 13, the delivery port of first order gas cooler 6 is connected with the water inlet that has the oxygen-eliminating device 2 of air intake and delivery port, and the water inlet of oxygen-eliminating device 2 also is connected with first low 3 the delivery port of adding of air intake before having, first low 3 the water inlet of adding lowly adds 4 delivery port and second low 4 the water inlet of adding is connected by pipeline with the 3rd low 5 the delivery port of adding of air intake before having with second of air intake before having, first low adds 3 venthole and second low 4 the back air intake of adding is connected by pipeline, second low adds 4 venthole and the 3rd low 5 the back air intake of adding is connected by pipeline, first low 3 the delivery port of adding lowly adds 4 venthole and the 3rd low pipeline that adds between 5 the air intake is connected with the water inlet of second level gas cooler 10 by having the pipeline that switches gate valve 13 and be provided with second closed cold pump 12 with second low 4 the water inlet and second that adds, and the pipeline between the water inlet of the delivery port of second level gas cooler 10 and first order gas cooler 6 is connected by switching gate valve 13 with the pipeline that is provided with second closed cold pump 12.The heating surface wall temperature 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, draw gas by first low 3 the preceding air intake of adding, second low adds that 4 preceding air intake draws gas and the 3rd low 5 the preceding 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 second closed cold pump 12 and close the import and export gate valve and 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 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 second closed cold pump 12 is provided with, close the gate valve that is provided with 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, draw gas by first low 3 the preceding air intake of adding, second low adds that 4 preceding air intake draws gas and the 3rd low 5 the preceding 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 is provided with the pipeline enclosure of second closed cold pump 12, close first closed cold pump 11, and open other switching gate valve, 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, draw gas by first low 3 the preceding air intake of adding, second low adds that 4 preceding air intake draws gas and the 3rd low 5 the preceding 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 second closed cold pump 12 and open other gate valve, first closed cold pump 11 and 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 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 is provided with the pipeline enclosure of second closed cold pump 12.
Claims (2)
1. an assembled smoke gas residual heat integrative utilizes system, comprise the air preheater (1) that has air outlet slit and smoke inlet, it is characterized in that: the air intake of air preheater (1) be located on air preheater (1) afterwards and the air outlet that is arranged in the steam air heater (7) in the air channel be 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 connected by pipeline respectively with the smoke inlet that has exhanst gas outlet and be arranged in the second level gas cooler (10) in the back-end ductwork, the water inlet of the same respectively steam air heater of the delivery port of second level gas cooler (10) and water inlet (7) and delivery port are connected by having the pipeline that switches gate valve (13), pipeline between the water inlet of the delivery port of second level gas cooler (10) and steam air heater (7) is connected with the water inlet and the delivery port that have the water supply tank (8) of water supplement port by having the pipeline that switches gate valve (13), pipeline between the water inlet of second level gas cooler (10) and the delivery port of steam air heater 7 also is provided with first closed cold pump (11), the delivery port of second level gas cooler (10) also is connected with the water inlet of first order gas cooler (6) by having the pipeline that switches gate valve (13), the delivery port of first order gas cooler (6) is connected with the water inlet that has 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) of air intake before having, second of the air intake low delivery port and the second low water inlet that adds (4) that adds (4) was connected by pipeline with the 3rd low delivery port that adds (5) that has preceding air intake before the first low water inlet that adds (3) had together, the first low venthole and the second low air intake that adds (4) that adds (3) is connected by pipeline, 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 connected with the water inlet of second level gas cooler (10) by having the pipeline that switches gate valve (13) and be provided with second closed cold pump (12) with the 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 the pipeline between the water inlet of the delivery port of second level gas cooler (10) and first order gas cooler (6) is connected by switching gate valve 13 with the pipeline that is provided with second closed cold pump (12).
2. assembled smoke gas residual heat integrative according to claim 1 utilizes system, it is characterized in that: the heating surface wall temperature 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.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101658414A CN102230615B (en) | 2011-06-20 | 2011-06-20 | Combined type flue gas residual heat comprehensive utilization system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101658414A CN102230615B (en) | 2011-06-20 | 2011-06-20 | Combined type flue gas residual heat comprehensive utilization system |
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| CN102230615A true CN102230615A (en) | 2011-11-02 |
| CN102230615B CN102230615B (en) | 2013-02-13 |
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Cited By (7)
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| CN102494329A (en) * | 2011-12-21 | 2012-06-13 | 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 |
| CN104006401A (en) * | 2013-11-04 | 2014-08-27 | 成信绿集成股份有限公司 | Power station boiler smoke waste heat deep recycling and emission reducing system |
| CN104406186A (en) * | 2014-11-27 | 2015-03-11 | 上海理工大学 | Flue gas water recycling system |
| CN105180146A (en) * | 2015-08-12 | 2015-12-23 | 中国华能集团清洁能源技术研究院有限公司 | Multi-stage smoke waste heat recovery and comprehensive utilization system for combined heat and power plant |
| CN109442376A (en) * | 2018-12-11 | 2019-03-08 | 中国华能集团清洁能源技术研究院有限公司 | A kind of air heater and low-pressure coal saver joint utilize smoke discharging residual heat 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN109442376A (en) * | 2018-12-11 | 2019-03-08 | 中国华能集团清洁能源技术研究院有限公司 | A kind of air heater and low-pressure coal saver joint utilize smoke discharging residual heat system |
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| C06 | Publication | ||
| PB01 | Publication | ||
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