CN203131797U - Device capable of improving efficiency of thermal power unit by utilizing residual heat of boiler flue gas step wise - Google Patents
Device capable of improving efficiency of thermal power unit by utilizing residual heat of boiler flue gas step wise Download PDFInfo
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- CN203131797U CN203131797U CN201320135156.1U CN201320135156U CN203131797U CN 203131797 U CN203131797 U CN 203131797U CN 201320135156 U CN201320135156 U CN 201320135156U CN 203131797 U CN203131797 U CN 203131797U
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- flue gas
- heat exchanger
- boiler
- water heater
- pressure feed
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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
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Abstract
本实用新型的梯级利用锅炉烟气余热提高火电机组效率的装置，包括锅炉和省煤器，其特征是：所述省煤器出口设置有空气预热器和烟气高压给水加热器，空气预热器进口端设置有一次风空气换热器和二次风空气换热器，烟气高压给水加热器出口端设置有烟气换热器，烟气换热器通过循环管路分别与一次风空气换热器和二次风空气换热器相连接。本实用新型的有益效果是：结构布置更加灵活自如，烟气换热器的受热面积大大减小，烟气高压给水加热器充当了省煤器的附加受热面，实现了烟气余热的温度对口梯级利用，提高了机组的效率，降低了火电机组的能耗，最终实现排烟温度大幅降低，同时减少了二氧化碳的排放。
The utility model is a cascade device for improving the efficiency of a thermal power unit by using boiler flue gas waste heat, which includes a boiler and an economizer. The inlet end of the heater is equipped with a primary air heat exchanger and a secondary air air heat exchanger, and the outlet end of the flue gas high-pressure feed water heater is equipped with a flue gas heat exchanger. The air heat exchanger is connected with the secondary air air heat exchanger. The beneficial effects of the utility model are: the structural arrangement is more flexible and the heating area of the flue gas heat exchanger is greatly reduced; The cascade utilization improves the efficiency of the unit, reduces the energy consumption of the thermal power unit, and finally achieves a significant reduction in the exhaust gas temperature and reduces carbon dioxide emissions.
Description
(1) technical field
The utility model belongs to the thermal cycle technology and utilizes the field, and particularly a kind of cascade utilization residual heat from boiler fume improves the device of fired power generating unit efficient.
(2) background technology
Power plant's heat loss due to exhaust gas is a part maximum in the boiler heat loss, 10～15 ℃ of the every reductions of exhaust gas temperature, and boiler efficiency just can improve 1%.At present, the design exhaust gas temperature of large-scale unit is generally at 120～130 ℃, and along with the updating of flue gas desulfurization and denitrification technology, flue gas acid dew point is about 90 ℃, so exhaust gas temperature also has very big decline space.Simultaneously overcritical and ultra supercritical unit boiler ubiquity exhaust gas temperature is higher than the phenomenon of design load, and it is higher that economizer exit enters the flue-gas temperature of air preheater.To this, it has been generally acknowledged that causing the high reason of exhaust gas temperature is that the Actual combustion ature of coal exists deviation with the design burning coal, during design tube wall stain and underestimate, economizer surface or Air Preheater Heating Surface are less than normal, and the back-end surfaces soot blower is arranged unreasonable or acted on not obvious etc.From manufacturing and designing the aspect, can increase the heat transfer area of air preheater, to reduce exhaust gas temperature.But reduce exhaust gas temperature individual limit is arranged, when exhaust gas temperature was relatively lower, along with the further reduction of flue-gas temperature, with the temperature difference minimizing of air, i.e. the heat transfer area of air preheater increase was a lot of on the one hand, and flue-gas temperature but reduces seldom; It is lower to work as exhaust gas temperature on the other hand, when the wall temperature of preheater tube is lower than flue gas dew point, cold end corrosion can take place, and moves 1 or two years and will change preheater, and will change half a year when serious.Another mode is to set up low-pressure coal saver at the flue afterbody, suitably increase economizer surface, force the fume afterheat utilization, improve feed temperature, but because it is not high to participate in the gas energy grade of heat transfer, and utilize low-pressure coal saver to strengthen the fume afterheat utilization, less to the unit generation contribution, heat energy utilization fails to accomplish temperature counterpart, cascade utilization, and the available energy loss is very big.
(3) utility model content
The utility model is in order to remedy the deficiencies in the prior art, provide a kind of structural configuration nimbly and freely, efficient height, low, the moving rate of energy consumption is big, cascade utilization residual heat from boiler fume that exhaust gas temperature significantly reduces improves fired power generating unit efficient device.
The utility model is achieved by the following technical solution:
A kind of cascade utilization residual heat from boiler fume improves the device of fired power generating unit efficient, comprise boiler and economizer, it is characterized in that: described economizer exit is provided with air preheater and flue gas high-pressure feed-water heater, the air preheater entrance point is provided with wind air heat exchanger and secondary wind air heat exchanger, the flue gas high-pressure feed-water heater port of export is provided with the flue gas heat exchange device, and the flue gas heat exchange device is connected with secondary wind air heat exchanger with a wind air heat exchanger respectively by circulation line.
Be separately installed with expansion slot and circulating pump on the described circulation line.
Described flue gas high-pressure feed-water heater two ends are connected with boiler feed main by Steam Turbine Regenerative System oxygen-eliminating device main water outlet pipe.
Described flue gas heat exchange device absorbs the second portion fume afterheat of the flue gas high-pressure feed-water heater of flowing through by heat transfer medium, and it is passed to wind air heat exchanger and secondary wind air heat exchanger respectively, and wind and secondary air separating are not preheated.
The beneficial effects of the utility model are: structural configuration more nimbly and freely, the heating surface area of flue gas heat exchange device reduces greatly, the flue gas high-pressure feed-water heater has served as the auxiliary heating surface of economizer, realize the temperature counterpart cascade utilization of fume afterheat, reduced Steam Turbine Regenerative System high pressure extraction amount, increased the steam turbine power generation amount, improved the efficient of unit, reduce the energy consumption of fired power generating unit, realized that finally exhaust gas temperature significantly reduces, reduced emission of carbon-dioxide simultaneously.
(4) description of drawings
Below in conjunction with accompanying drawing the utility model is further described.
Accompanying drawing 1 is structural representation of the present utility model;
Among the figure, 1 boiler, 2 economizers, 3 air preheaters, 4 flue gas high-pressure feed-water heaters, 5 wind air heat exchangers, 6 secondary wind air heat exchangers, 7 flue gas heat exchange devices, 8 circulation lines, 9 expansion slots, 10 circulating pumps, 11 Steam Turbine Regenerative System oxygen-eliminating device main water outlet pipe, 12 boiler feed mains.
(5) specific embodiment
Accompanying drawing is a kind of specific embodiment of the present utility model.This embodiment comprises boiler 1 and economizer 2, economizer 1 outlet is provided with air preheater 3 and flue gas high-pressure feed-water heater 4, air preheater 3 entrance points are provided with wind air heat exchanger 5 and secondary wind air heat exchanger 6, flue gas high-pressure feed-water heater 4 ports of export are provided with flue gas heat exchange device 7, and flue gas heat exchange device 7 is connected with secondary wind air heat exchanger 6 with a wind air heat exchanger 5 respectively by circulation line 8.Be separately installed with expansion slot 9 and circulating pump 10 on the circulation line 8.Flue gas high-pressure feed-water heater 4 two ends are connected with boiler feed main 12 by Steam Turbine Regenerative System oxygen-eliminating device main water outlet pipe 11.First's flue gas after shunting air preheater 3 of flowing through does not heat wind and secondary air separating; The second portion flue gas flue gas high-pressure feed-water heater 4 of flowing through, after the high-pressure feed water of Steam Turbine Regenerative System oxygen-eliminating device main water outlet pipe 11 shuntings heated, the high-pressure feed water after the heating imported boiler feed main 12.Flue gas heat exchange device 7 absorbs the second portion fume afterheat of the flue gas high-pressure feed-water heater 4 of flowing through by heat transfer medium, and it is passed to wind air heat exchanger 5 and secondary wind air heat exchanger 6 respectively, and wind and secondary air separating are not preheated.
The utility model has been abandoned the increase air preheater heat transfer Method for Area of poor effect, change into and utilize the heat transfer medium conduction oil to absorb heat at the flue gas heat exchange device, enter the air heat exchanger release heat again, preheating is from a secondary wind of pressure fan, improve the air intlet end one secondary wind wind-warm syndrome of air preheater, realized the displacement of temperature counterpart heat.After owing to absorb heat in air preheater from a secondary wind of pressure fan, temperature is improved, after entering air preheater, the heat that one secondary wind is heated to identical temperature to be needed reduces, the exhaust gas volumn that needs is reduced, therefore the exhaust gas volumn that enters air preheater can be shunted away, has realized the displacement of different grade heats.The flue gas share that enters air preheater reduces, the abundant release heat cooling of flue gas, solved the higher problem of air preheater entrance point cigarette temperature, and because the splitter section flue gas enters the flue gas high-pressure feed-water heater, the flow through resistance of air preheater of flue gas descends.
The high-grade flue gas (i.e. Fen Liu flue gas) of displacement enters the flue gas high-pressure feed-water heater, heating is from the feedwater of Steam Turbine Regenerative System oxygen-eliminating device main water outlet pipe shunting, meet the principle of temperature counterpart, the utilization of heat ladder, heated feedwater imports in the boiler feed main.The flue gas high-pressure feed-water heater has served as the Steam Turbine Regenerative System high-pressure heater, has reduced the amount of drawing gas of high-pressure heater, and the steam turbine acting is returned in drawing gas of this saving, has increased the generated energy of unit, has improved the efficient of unit; Or served as additional economizer, improved the efficient of boiler.
Adopt the method and apparatus that a kind of cascade utilization residual heat from boiler fume improves fired power generating unit efficient that is particularly related to of the present utility model, two embodiment arranged:
Embodiment 1: the gas approach end flue gas shunting 10%-30% with air preheater 3 enters flue gas high-pressure feed-water heater 4 and flue gas heat exchange device 7.From Steam Turbine Regenerative System oxygen-eliminating device main water outlet pipe 11 and boiler feed main 12 steam turbine ends shunting high-pressure feed water, enter flue gas high-pressure feed-water heater 4.In flue gas high-pressure feed-water heater 4, the feedwater of shunting is heated to 230-300 ℃, high-pressure feed water remittance boiler feed main 12 boiler end after the heating from about 150-190 ℃.The flue-gas temperature of coming out from flue gas high-pressure feed-water heater 4 still reaches 170-270 ℃, enters flue gas heat exchange device 7.
The flue gas of all the other 70%-90% still enters air preheater 3 heating one secondary wind.A wind of air preheater 3 air intlet ends is 40-70 ℃ through wind air heat exchanger 5, the wind-warm syndrome of secondary wind after 6 preheatings of secondary wind air heat exchanger, after entering air preheater 3 and being heated by flue gas, one secondary air temperature still can reach 300-330 ℃, satisfies the combustion requirements of boiler furnace.The flue gas flow that enters air preheater 3 reduces, because heat exchange area is constant, coefficient of heat transfer fluctuation is little, though the heat transfer temperature and pressure decrease, the cigarette temperature is still effectively reduced.
Flue gas from flue gas high-pressure feed-water heater 4 enters flue gas heat exchange device 7.In flue gas heat exchange device 7, the heat transfer medium conduction oil absorbs the waste heat from flue gas, be warming up to 100-180 ℃, establish expansion slot 9 on the circulation line 8, high temperature heat conductive oil shunting enters wind air heat exchanger 5 and secondary wind air heat exchanger 6 respectively, and the flue gas cigarette temperature drop of flue gas heat exchange device 7 outlets is to 90-120 ℃.Secondary wind wind-warm syndrome from pressure fan is atmosphere normal temperature, one time wind enters wind air heat exchanger 5 one time, secondary wind enters secondary wind air heat exchanger 6, absorption is from the heat of the heat transfer medium conduction oil of flue gas heat exchange device 7, one secondary wind obtains heating, be warming up to 40-70 ℃, enter air preheater 3 again.The heat transfer medium conduction oil that comes out from wind air heat exchanger 5 and secondary wind air heat exchanger 6 cools to converge through circulating pump 10 after 70-100 ℃ and boosts, and turns back to heat absorption in the flue gas heat exchange device 7, so circulation.The flue gas of flue gas heat exchange device 7 outlets imports former air preheater 3 exhaust pass and enters deduster.Exhaust gas temperature descends, and the fired power generating unit generating efficiency improves more than 1%.
If the flue-gas temperature of mixed flue gas outlet is lower than setting value, then reduce the exhaust gas volumn that enters flue gas high-pressure feed-water heater 4; If the flue-gas temperature of mixed flue gas outlet is higher than setting value, then increase the exhaust gas volumn that enters flue gas high-pressure feed-water heater 4.If a secondary air temperature of air preheater 3 outlets is lower than setting value, then strengthen the fluid flow of circulating pump 10; If a secondary air temperature of air preheater 3 outlets is higher than setting value, then reduce the fluid flow of circulating pump 10.If the relation (high and low) between the secondary air temperature of air preheater 3 outlet is improper, can be diverted to a wind air heat exchanger 5 and controls with the size of secondary wind air heat exchanger 6 flows by regulating high temperature heat conductive oil from flue gas heat exchange device 7.
Embodiment 2: air preheater 3 gas approach end flue gas shunting parts are entered flue gas high-pressure feed-water heater 4 and flue gas heat exchange device 7.From Steam Turbine Regenerative System oxygen-eliminating device main water outlet pipe 11 and boiler feed main 12 steam turbine ends shunting high-pressure feed water, enter flue gas high-pressure feed-water heater 4.In flue gas high-pressure feed-water heater 4, the feedwater of shunting heating back imports boiler feed main 12 boiler end.The flue gas that comes out from flue gas high-pressure feed-water heater 4 enters flue gas heat exchange device 7.
Remaining flue gas still enters air preheater 3 heating one secondary wind.A wind of air preheater 3 air intlet ends after entering air preheater 3 heating after 6 preheatings of secondary wind air heat exchanger, satisfies the combustion requirements of boiler furnace through wind air heat exchanger 5, secondary wind.The flue gas flow that enters air preheater 3 reduces, though the heat transfer temperature and pressure decrease, the cigarette temperature is still effectively reduced.
Flue gas from flue gas high-pressure feed-water heater 4 enters flue gas heat exchange device 7.In flue gas heat exchange device 7, the heat transfer medium conduction oil absorbs the waste heat from flue gas, heats up, and conduction oil high temperature circulation pipeline 8 is provided with expansion slot 9, high temperature heat conductive oil shunting enters wind air heat exchanger 5 and secondary wind air heat exchanger 6 respectively, and the flue gas cigarette temperature drop of flue gas heat exchange device 7 outlets is low.Secondary wind wind-warm syndrome from pressure fan is atmosphere normal temperature, one time wind enters wind air heat exchanger 5 one time, and secondary wind enters secondary wind air heat exchanger 6, absorbs the heat from the heat transfer medium conduction oil of flue gas heat exchange device 7, one secondary wind obtains preheating, enters air preheater 3 again.Converge through circulating pump 10 after the heat transfer medium conduction oil that comes out from air heat exchanger 5 and air heat exchanger 6 cools and boost, turn back to heat absorption in the flue gas heat exchange device 7, so circulation.The flue gas of flue gas heat exchange device 7 outlets imports former air preheater 3 exhaust pass and enters deduster.
Claims (4)
1. a cascade utilization residual heat from boiler fume improves the device of fired power generating unit efficient, comprise boiler (1) and economizer (2), it is characterized in that: described economizer (1) outlet is provided with air preheater (3) and flue gas high-pressure feed-water heater (4), air preheater (3) entrance point is provided with a wind air heat exchanger (5) and secondary wind air heat exchanger (6), flue gas high-pressure feed-water heater (4) port of export is provided with flue gas heat exchange device (7), and flue gas heat exchange device (7) is connected with secondary wind air heat exchanger (6) with a wind air heat exchanger (5) respectively by circulation line (8).
2. cascade utilization residual heat from boiler fume according to claim 1 improves the device of fired power generating unit efficient, it is characterized in that: be separately installed with expansion slot (9) and circulating pump (10) on the described circulation line (8).
3. cascade utilization residual heat from boiler fume according to claim 1 improves the device of fired power generating unit efficient, and it is characterized in that: described flue gas high-pressure feed-water heater (4) two ends are connected with boiler feed main (12) by Steam Turbine Regenerative System oxygen-eliminating device main water outlet pipe (11).
4. cascade utilization residual heat from boiler fume according to claim 1 improves the device of fired power generating unit efficient, it is characterized in that: described flue gas heat exchange device (7) absorbs the second portion fume afterheat of the flue gas high-pressure feed-water heater (4) of flowing through by heat transfer medium, and it is passed to a wind air heat exchanger (5) and secondary wind air heat exchanger (6) respectively, wind and secondary air separating are not preheated.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320135156.1U CN203131797U (en) | 2013-03-25 | 2013-03-25 | Device capable of improving efficiency of thermal power unit by utilizing residual heat of boiler flue gas step wise |
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| CN201320135156.1U CN203131797U (en) | 2013-03-25 | 2013-03-25 | Device capable of improving efficiency of thermal power unit by utilizing residual heat of boiler flue gas step wise |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103134044A (en) * | 2013-03-25 | 2013-06-05 | 济南海普电力节能科技有限公司 | Method and device capable of improving efficiency of thermal power unit by cascade utilization of boiler smoke waste heat |
| CN103453513A (en) * | 2013-09-04 | 2013-12-18 | 济南海普电力节能科技有限公司 | Cascade utilization method and device of waste gas of flue gas of boiler for thermal power unit |
| CN105531537A (en) * | 2013-09-19 | 2016-04-27 | 阿尔斯通技术有限公司 | Flue gas heat recovery integration |
| CN105823077A (en) * | 2016-03-22 | 2016-08-03 | 西安交通大学 | Thermal power plant medium-low temperature flue gas heat energy gradient utilization system and method |
| CN108534125A (en) * | 2018-04-11 | 2018-09-14 | 国电南京电力试验研究有限公司 | A kind of width load high pressure steam-supplying system |
| CN112503556A (en) * | 2020-12-02 | 2021-03-16 | 大唐环境产业集团股份有限公司 | Flue gas waste heat recovery device of thermal power generating unit boiler |
| CN113864768A (en) * | 2021-09-30 | 2021-12-31 | 武汉立为工程技术有限公司 | A reheated secondary air ultra-low load oil-free stable combustion system |
| CN115218176A (en) * | 2022-06-29 | 2022-10-21 | 光大环境科技（中国）有限公司 | Heating system and method for heating primary air and low temperature flue gas using economizer feed water |
| CN118242661A (en) * | 2024-05-30 | 2024-06-25 | 杭州通勤科技有限公司 | Boiler flue gas waste heat recovery method |
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2013
- 2013-03-25 CN CN201320135156.1U patent/CN203131797U/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103134044A (en) * | 2013-03-25 | 2013-06-05 | 济南海普电力节能科技有限公司 | Method and device capable of improving efficiency of thermal power unit by cascade utilization of boiler smoke waste heat |
| CN103134044B (en) * | 2013-03-25 | 2015-05-20 | 山东英电节能科技有限公司 | Method and device capable of improving efficiency of thermal power unit by cascade utilization of boiler smoke waste heat |
| CN103453513A (en) * | 2013-09-04 | 2013-12-18 | 济南海普电力节能科技有限公司 | Cascade utilization method and device of waste gas of flue gas of boiler for thermal power unit |
| CN103453513B (en) * | 2013-09-04 | 2015-04-08 | 山东英电节能科技有限公司 | Cascade utilization method and device of waste gas of flue gas of boiler for thermal power unit |
| CN105531537B (en) * | 2013-09-19 | 2019-07-05 | 通用电器技术有限公司 | Flue gas recuperation of heat integration |
| US10288279B2 (en) | 2013-09-19 | 2019-05-14 | Alstom Technology Ltd | Flue gas heat recovery integration |
| CN105531537A (en) * | 2013-09-19 | 2016-04-27 | 阿尔斯通技术有限公司 | Flue gas heat recovery integration |
| CN105823077A (en) * | 2016-03-22 | 2016-08-03 | 西安交通大学 | Thermal power plant medium-low temperature flue gas heat energy gradient utilization system and method |
| CN105823077B (en) * | 2016-03-22 | 2019-01-08 | 西安交通大学 | Low-temperature flue gas heat energy stepped utilization system and method in a kind of thermal power plant |
| CN108534125A (en) * | 2018-04-11 | 2018-09-14 | 国电南京电力试验研究有限公司 | A kind of width load high pressure steam-supplying system |
| CN112503556A (en) * | 2020-12-02 | 2021-03-16 | 大唐环境产业集团股份有限公司 | Flue gas waste heat recovery device of thermal power generating unit boiler |
| CN113864768A (en) * | 2021-09-30 | 2021-12-31 | 武汉立为工程技术有限公司 | A reheated secondary air ultra-low load oil-free stable combustion system |
| CN115218176A (en) * | 2022-06-29 | 2022-10-21 | 光大环境科技（中国）有限公司 | Heating system and method for heating primary air and low temperature flue gas using economizer feed water |
| CN118242661A (en) * | 2024-05-30 | 2024-06-25 | 杭州通勤科技有限公司 | Boiler flue gas waste heat recovery method |
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