CN104534439A - System and method for indirectly heating air heater through extracted low-level steam in waste heat cascade utilization mode - Google Patents
System and method for indirectly heating air heater through extracted low-level steam in waste heat cascade utilization mode Download PDFInfo
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- CN104534439A CN104534439A CN201510010396.2A CN201510010396A CN104534439A CN 104534439 A CN104534439 A CN 104534439A CN 201510010396 A CN201510010396 A CN 201510010396A CN 104534439 A CN104534439 A CN 104534439A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The invention provides a system and method for indirectly heating an air heater through extracted low-level steam in a waste heat cascade utilization mode. The system comprises a gas-gas heater arranged between a boiler rear smoke channel air preheater and an electric dust remover, the air heater arranged in front of an air side inlet of the air preheater and a circulating water pipe for connecting the gas-gas heater and the air heater and condensation water, primary cold air and secondary cold air in the air heater are heated through the condensation water at an outlet of a No.7 low-pressure heater, return water of an outlet of the air heater is returned to an inlet of a No. 8 low-pressure heater, the flow of the condensation water of the No.7 low-pressure heater and the No. 8 low-pressure heater is increased, the flow of No.8 extracted steam and No.7 extracted steam is increased, and the purpose of indirectly heating the air heater through the No.8 extracted steam and the No.7 extracted steam is achieved; part of condensation water led out by an inlet of a No.6 low-pressure heater is conveyed to the gas-gas heater to absorb heat and is led back to a regenerative system through an outlet of the No.6 low-pressure heater, the flow of the condensation water of the No.6 low-pressure heater is decreased, the flow of the No.6 extracted steam is decreased accordingly, a part of the squeezed out No.6 extracted steam is conveyed to a steam turbine to conduct acting, and the economical efficiency of a unit is improved.
Description
Technical field
The present invention relates to thermal power generating technology field, the low-lying level being specifically related to exhaust heat stepped utilization is drawn gas indirect steam air heater system and method.
Background technology
Along with in the rising steadily of global energy price, world wide, weather constantly worsens, country is stricter to energy-saving and cost-reducing requirement, how deeply to excavate the energy-conservation potentiality of existing power station unit, reduce the production run cost of enterprise, become the major issue that each enterprise is concerned about jointly.
Northern China major part station boiler unit all installs steam air heater system, to solve the problems such as winter air pre-heater inlet air themperature low or low the caused air preheater cold-end air cold end corrosion of underload down smoke-discharging temperature, dust stratification blocking.The many employings 4 of current steam air heater system heating or 6 of drawing gas is drawn gas mode of heating, and thermal source energy level is higher, uneconomical.If utilize the heat that draws gas of lower level directly to heat, need to draw gas under negative pressure state, and the density of drawing gas is large compared with low, volume flow, need thicker gas pipeline, problem is also more.Therefore, other more economical heat source steam air heater need be considered, to improve the economy of unit.
In China's active service fired power generating unit, exhaust gas temperature generally maintains 125 ~ 150 DEG C of left and right horizontal, higher than design load.Generally exhaust gas temperature often raises 20 DEG C, and heat loss due to exhaust gas increases by 0.6% ~ 1.0%, produces adverse influence to the economy of unit.Along with the raising of steam air heater outlet air temperature, exhaust gas temperature will raise further.For ensureing economy the putting into operation and reduce not with steam air heater of unit, need be recycled residual heat from boiler fume.After air preheater, install flue gas heat-exchange unit can effective Mist heat recovering, and reduces the flue-gas temperature and the flow that enter follow-up electric precipitation, desulfurizing tower and air-introduced machine, ensures that unit economy does not put into operation with steam air heater and reduces.
Summary of the invention
In order to overcome above-mentioned prior art Problems existing, a kind of low-lying level of exhaust heat stepped utilization is the object of the present invention is to provide to draw gas indirect steam air heater system and method, utilize the indirect steam air heater that draws gas of low-lying level, utilize flue gas heat-exchange unit Mist heat recovering simultaneously and for replacing drawing gas of higher energy level, realize the preferred arrangement of steam air heater thermal source and the cascade utilization of low-lying level heat.
In order to realize foregoing invention object, the technical scheme that the present invention takes is:
The low-lying level of exhaust heat stepped utilization is drawn gas indirect steam air heater system, comprise the flue gas heat-exchange unit 2 be arranged between boiler back end ductwork air preheater 1 and electric cleaner 3, be arranged on the steam air heater 10 before air preheater 1 air side entrance, connect the circulating water line of flue gas heat-exchange unit 2 and steam air heater 10 and condensate water, described steam air heater 10 with the annexation of the circulating water line of condensate water is: No. 7 low-pressure heater 8 condensate water export a point two-way, the entrance of one tunnel access steam air heater 10, the outlet of steam air heater 10 connects No. 8 low-pressure heaters 9 and heat regenerative system successively, another road of No. 7 low-pressure heater 8 condensate water outlets connects the import of No. 6 low-pressure heater 7 condensate water, described flue gas heat-exchange unit 2 with the annexation of the circulating water line of condensate water is: the import of No. 6 low-pressure heater 7 condensate water is drawn a road and accessed flue gas heat-exchange unit 2, and the condensate water outlet of flue gas heat-exchange unit 2 exports access heat regenerative system by No. 6 low-pressure heaters 7.
The method of system indirect steam air heater described above and smoke discharging residual heat cascade utilization is: export first and second cold wind in extension condensate water heating steam air heater 10 by No. 7 low-pressure heaters 8, improve air preheater 1 entering air temperature; Condensate water in steam air heater after 10 release heat leads back heat regenerative system by No. 8 low-pressure heater 9 entrances, make the condensing water flow increase, the thermal power increase that flow through No. 8 low-pressure heaters 9 and No. 7 low-pressure heaters 8, corresponding draw gas with 8 of the connection of No. 8 low-pressure heaters 9 and No. 7 low-pressure heaters 8 respectively 11 and 7 draw gas 12 flow increase, thus achieve 8 draw gas 11 and 7 draw gas 12 heat indirect steam air heater 10 in the object of primary and secondary air; The partial coagulation water of being drawn by No. 6 low-pressure heater 7 entrances sends into heat absorption in flue gas heat-exchange unit 2, and lead back heat regenerative system by No. 6 low-pressure heaters 7 outlets, the condensing water flow flowing through No. 6 low-pressure heaters 7 reduces, connect to No. 6 low-pressure heaters 76 draw gas 13 the also corresponding minimizing of steam flow amount, done work by the part 6 the squeezed 13 feeding steam turbines that draw gas; Due to 6 draw gas 13 energy level to draw gas higher than 8 and 11 and 7 draw gas 12, by squeeze 6 draw gas 13 acting ability increase the acting ability of loss higher than 8 11 and 7 12 flows that draw gas that draw gas, the economy of unit improves.
Compared to the prior art, tool has the following advantages in the present invention:
After adopting present system, make the thermal source of steam air heater be able to indirect utilization low-lying level to draw gas, thermal source obtains reasonably optimizing, improves the energy level of boiler exhaust gas waste heat simultaneously, make it can use in the low-pressure heater of higher energy level, achieve the cascade utilization of smoke discharging residual heat.The present invention adopts low-lying level to draw gas heat-setting water, re-use the scheme of condensate water heating steam air heater, both the energy level of heat source had been reduced, turn avoid use low-lying level draw gas direct heating steam air heater time need draw gas under negative pressure state and problem that volume flow of drawing gas is larger, the economy of unit is improved.
Accompanying drawing explanation
Accompanying drawing is structural representation of the present invention.
Wherein, 1 is air preheater, and 2 is flue gas heat-exchange unit, and 3 is electric cleaner, and 4 is air-introduced machine, 5 is desulfurizing tower, and 6 is chimney, and 7 is No. 6 low-pressure heaters, and 8 is No. 7 low-pressure heaters, and 9 is No. 8 low-pressure heaters, 10 is steam air heater, and 11 is 8 to draw gas, and 12 is 7 to draw gas, and 13 is 6 to draw gas.
Detailed description of the invention
Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.
As shown in drawings, the low-lying level of the exhaust heat stepped utilization of the present invention is drawn gas indirect steam air heater system, comprise the flue gas heat-exchange unit 2 be arranged between boiler back end ductwork air preheater 1 and electric cleaner 3, be arranged on the steam air heater 10 before air preheater 1 air side entrance, connect the circulating water line of flue gas heat-exchange unit 2 and steam air heater 10 and condensate water, described steam air heater 10 with the annexation of the circulating water line of condensate water is: No. 7 low-pressure heater 8 condensate water export a point two-way, the entrance of one tunnel access steam air heater 10, the outlet of steam air heater 10 connects No. 8 low-pressure heaters 9 and heat regenerative system successively, another road of No. 7 low-pressure heater 8 condensate water outlets connects the import of No. 6 low-pressure heater 7 condensate water, described flue gas heat-exchange unit 2 with the annexation of the circulating water line of condensate water is: the import of No. 6 low-pressure heater 7 condensate water is drawn a road and accessed flue gas heat-exchange unit 2, and the condensate water outlet of flue gas heat-exchange unit 2 exports access heat regenerative system by No. 6 low-pressure heaters 7.
As shown in drawings, the method for system indirect steam air heater of the present invention and smoke discharging residual heat cascade utilization is: export first and second cold wind in extension condensate water heating steam air heater 10 by No. 7 low-pressure heaters 8, improve air preheater 1 entering air temperature; Condensate water in steam air heater after 10 release heat leads back heat regenerative system by No. 8 low-pressure heater 9 entrances, make the condensing water flow increase, the thermal power increase that flow through No. 8 low-pressure heaters 9 and No. 7 low-pressure heaters 8, corresponding draw gas with 8 of the connection of No. 8 low-pressure heaters 9 and No. 7 low-pressure heaters 8 respectively 11 and 7 draw gas 12 flow increase, thus achieve 8 draw gas 11 and 7 draw gas 12 heat indirect steam air heater 10 in the object of primary and secondary air.
As shown in drawings, first and second wind-warm syndrome exported due to steam air heater 10 improves, and the exhaust gas temperature that air preheater 1 exports improves, and the energy level of fume afterheat improves, and boiler exhaust gas waste heat relies on the flue gas heat-exchange unit 2 be arranged in after air preheater 1 to absorb.The partial coagulation water of being drawn by No. 6 low-pressure heater 7 entrances sends into heat absorption in flue gas heat-exchange unit 2, and lead back heat regenerative system by No. 6 low-pressure heaters 7 outlets, the condensing water flow flowing through No. 6 low-pressure heaters 7 reduces, connect to No. 6 low-pressure heaters 76 draw gas 13 the also corresponding minimizing of steam flow amount, done work by the part 6 the squeezed 13 feeding steam turbines that draw gas; The flue gas that flue gas heat-exchange unit 2 exports is emptying through electric cleaner 3, air-introduced machine 4, desulfurizing tower 5 and chimney 6 successively.
Due to 6 draw gas 13 energy level to draw gas higher than 8 and 11 and 7 draw gas 12, by squeeze 6 draw gas 13 acting ability higher than 8 draw gas 11 and 7 draw gas 12 flows increase loss acting ability, in said system arrangement, 11 and 7 to draw gas one in 12 heating steam air heaters 10 because indirect utilization 8 draws gas, Secondary Air temperature, and exhaust gas temperature is raised, the smoke discharging residual heat that the energy level produced is higher then draws gas 13 for squeezing 6, the object of heat thus the heat replacement high-grade of drawing gas achieving the low taste of use is drawn gas, the economy of unit entirety is improved.
Claims (2)
1. the low-lying level of exhaust heat stepped utilization is drawn gas indirect steam air heater system, it is characterized in that: comprise the flue gas heat-exchange unit (2) be arranged between boiler back end ductwork air preheater (1) and electric cleaner (3), be arranged on the steam air heater (10) before air preheater (1) air side entrance, connect the circulating water line of flue gas heat-exchange unit (2) and steam air heater (10) and condensate water, described steam air heater (10) with the annexation of the circulating water line of condensate water is: No. 7 low-pressure heater (8) condensate water export a point two-way, the entrance on one tunnel access steam air heater (10), the outlet of steam air heater (10) connects No. 8 low-pressure heaters (9) and heat regenerative system successively, another road of No. 7 low-pressure heater (8) condensate water outlets connects the condensate water import of No. 6 low-pressure heaters (7), described flue gas heat-exchange unit (2) with the annexation of the circulating water line of condensate water is: the condensate water import of No. 6 low-pressure heaters (7) is drawn a road and accessed flue gas heat-exchange unit (2), and the condensate water outlet of flue gas heat-exchange unit (2) is by No. 6 low-pressure heater (7) outlet access heat regenerative systems.
2. described in claim 1, the method for system indirect steam air heater and smoke discharging residual heat cascade utilization is: it is characterized in that:
Export first and second cold wind in extension condensate water heating steam air heater (10) by No. 7 low-pressure heaters (8), improve air preheater (1) entering air temperature, condensate water in steam air heater after (10) release heat leads back heat regenerative system by No. 8 low-pressure heater (9) entrances, the condensing water flow flowing through No. 8 low-pressure heaters (9) and No. 7 low-pressure heaters (8) is increased, thermal power increases, corresponding draw gas with 8 of the connection of No. 8 low-pressure heaters (9) and No. 7 low-pressure heaters (8) respectively (11) and 7 the draw gas flow of (12) increases, thus achieve 8 draw gas (11) and 7 draw gas (12) heat indirect steam air heater (10) in one, the object of Secondary Air,
The partial coagulation water of being drawn by No. 6 low-pressure heater (7) entrances sends into heat absorption in flue gas heat-exchange unit (2), and lead back heat regenerative system by the outlet of No. 6 low-pressure heaters (7), the condensing water flow flowing through No. 6 low-pressure heaters (7) reduces, connect to No. 6 low-pressure heaters (7) the 6 steam flow amount also corresponding minimizings of drawing gas (13), by the part 6 squeezed draw gas (13) send into steam turbine acting; Due to 6 draw gas (13) energy level higher than 8 draw gas (11) and 7 draw gas (12), increased the acting ability of loss by the 6 acting abilities of drawing gas (13) squeezed higher than 8 (11) and 7 (12) flows that draw gas that draw gas, the economy of unit improves.
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| CN201510010396.2A CN104534439A (en) | 2015-01-07 | 2015-01-07 | System and method for indirectly heating air heater through extracted low-level steam in waste heat cascade utilization mode |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106051805A (en) * | 2016-06-24 | 2016-10-26 | 福建龙净环保股份有限公司 | Waste heat recovery system and method with discharged smoke waste heat as heat source of air heater |
| CN106091580A (en) * | 2016-06-16 | 2016-11-09 | 西安交通大学 | The predrying brown coal electricity generation system of a kind of integrated steam air heater and method |
| CN106287771A (en) * | 2016-09-14 | 2017-01-04 | 西安热工研究院有限公司 | A kind of coal-fired power station boiler fume afterheat utilizes system with moisture combined recovery |
| CN108534126A (en) * | 2018-03-23 | 2018-09-14 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | It is a kind of with pressure matcher machine stove waste heat coupling utilize system |
| CN109871624A (en) * | 2019-02-26 | 2019-06-11 | 华北电力科学研究院有限责任公司 | Energy consumption analysis method and device after thermal power plant's steam air heater heat source reforming |
| CN110578931A (en) * | 2019-07-31 | 2019-12-17 | 西安航天源动力工程有限公司 | System and method for adjusting temperature of primary air and secondary air by utilizing condensed water to improve air heater |
| CN110594774A (en) * | 2019-09-12 | 2019-12-20 | 中国电力工程顾问集团西南电力设计院有限公司 | Heating system of air heater at cold end of air preheater of thermal power plant |
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| CN106051805B (en) * | 2016-06-24 | 2018-12-14 | 福建龙净环保股份有限公司 | A kind of residual neat recovering system and method using smoke discharging residual heat as steam air heater heat source |
| CN106287771A (en) * | 2016-09-14 | 2017-01-04 | 西安热工研究院有限公司 | A kind of coal-fired power station boiler fume afterheat utilizes system with moisture combined recovery |
| CN108534126A (en) * | 2018-03-23 | 2018-09-14 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | It is a kind of with pressure matcher machine stove waste heat coupling utilize system |
| CN109871624A (en) * | 2019-02-26 | 2019-06-11 | 华北电力科学研究院有限责任公司 | Energy consumption analysis method and device after thermal power plant's steam air heater heat source reforming |
| CN109871624B (en) * | 2019-02-26 | 2022-12-20 | 华北电力科学研究院有限责任公司 | Energy consumption analysis method and device after heat source transformation of heat-engine plant air heater |
| CN110578931A (en) * | 2019-07-31 | 2019-12-17 | 西安航天源动力工程有限公司 | System and method for adjusting temperature of primary air and secondary air by utilizing condensed water to improve air heater |
| CN110594774A (en) * | 2019-09-12 | 2019-12-20 | 中国电力工程顾问集团西南电力设计院有限公司 | Heating system of air heater at cold end of air preheater of thermal power plant |
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Application publication date: 20150422 |