CN206369220U - It is a kind of to reclaim the system that exhaust steam residual heat improves the thermal efficiency and unit on-load ability - Google Patents
It is a kind of to reclaim the system that exhaust steam residual heat improves the thermal efficiency and unit on-load ability Download PDFInfo
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- CN206369220U CN206369220U CN201620898538.3U CN201620898538U CN206369220U CN 206369220 U CN206369220 U CN 206369220U CN 201620898538 U CN201620898538 U CN 201620898538U CN 206369220 U CN206369220 U CN 206369220U
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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
The system that exhaust steam residual heat improves the thermal efficiency and unit on-load ability, including air water heat-exchange system and weary steam/water heat exchange system are reclaimed the utility model discloses a kind of；Water charging system is connected by circulating water pipeline with the tube side water inlet of exhaust steam cooler, the tube side delivery port of exhaust steam cooler is connected with the import header of primary and secondary air steam air heater respectively, the water outlet of primary and secondary air steam air heater by outlet header draw after collect for a pipeline, the pipeline is connected to form closed cycle by the tube side water inlet of circulating water pipeline and exhaust steam cooler；The exhaust steam of condenser entrance is by entering the shell side air intake of exhaust steam cooler with the connecting pipe of exhaust steam cooler in weary steam/water heat exchange system, and shell side venthole is connected by the first hot well with the hot well of condenser second.The utility model can be effectively utilized the heat of exhaust steam, reduce turbine back pressure, it is possible to increase the efficiency of boiler and steam turbine, reduce net coal consumption rate, improve the whole economic efficiency in power plant and save the energy.
Description
Technical field
The utility model is related to a kind of system for improving the thermal efficiency, more particularly to a kind of exhaust steam residual heat that reclaims improves the thermal efficiency
And the system of unit on-load ability.
Background technology
China's energy consumption structure is based on coal, with the rapid development of economy, electricity needs increases year by year, in recent years
Increasing large-scale coal-fired thermal power generation unit comes into operation, and current China's fired power generating unit accounts for the 74% of total installation of generating capacity.Face
Increasingly strict power conservation requirement and huge environmental pressure, make great efforts to improve the efficiency of Thermal generation unit, rationally effective utilization
Limited coal resources are a fundamental state policies of China.
During the production run of thermal power plant, feedwater is heated to be superheated steam through boiler, and superheated steam enters through pipeline
Enter steam turbine acting, convert heat into mechanical energy and drive generator acting.Exhaust steam after acting is drained into through turbine low pressure cylinder
Condenser, exhaust steam heat is taken away by external cooling water in condenser, enters as condensate into steam turbine low-pressure heater
Row heating.The heat of exhaust steam is taken away by cooling water in Air-cooled Unit, cooling water in air cooling tower with air exchange heat, by heat
Release so causes very big energy waste into air.Due to the hot specific volume of air itself it is small the characteristics of, summer environment temperature
Increase, cause turbine back pressure too high, on-load ability decline, unit generation coal consumption increase.
Conventional boiler steam air heater is to draw gas to heat the heat exchange of air preheater import air using steamer machine auxiliary steam
Device, raises the air themperature of air inlet preheater, air preheater wall temperature rise, so as to prevent low-temperature corrosion.It is conventional
Steam air heater is, by cold air heating, though preventing the generation of the low-temperature corrosion problem of air preheater, to drop using extracted steam from turbine
Low steam-turbine acting ability, have impact on the heat-economy of steam turbine.
Utility model content
In order to solve the weak point present in above-mentioned technology, the utility model provides a kind of exhaust steam residual heat that reclaims and improved
The system and the systematic difference method of the thermal efficiency and unit on-load ability, it is possible to increase the efficiency of boiler and steam turbine, drop
Low net coal consumption rate, improves the whole economic efficiency in power plant and saves the energy.
In order to solve the above technical problems, the technical solution adopted in the utility model is：One kind reclaims exhaust steam residual heat and improved
The system of the thermal efficiency and unit on-load ability, it includes Air-Water heat-exchange system and exhaust steam-water heat-exchange system；Air-Water is changed
Hot systems include exhaust steam cooler, water charging system, First air steam air heater and Secondary Air steam air heater；Water charging system passes through circulating water pipe
Road is connected with the tube side water inlet of exhaust steam cooler, the tube side delivery port of exhaust steam cooler by pipeline respectively with First air warm wind
Device, Secondary Air steam air heater import header connection, First air steam air heater, Secondary Air steam air heater water outlet after outlet header is drawn
Collect for a pipeline, the pipeline is connected structure by the circulating water pipeline of water charging system with the tube side water inlet of exhaust steam cooler
Into closed cycle；Closed cycle water pump is installed on circulating water pipeline；First air steam air heater, Secondary Air steam air heater pass through one respectively
Air supply duct, the air supply duct of Secondary Air blower fan of secondary wind blower fan are connected with air preheater；
Exhaust steam-water heat-exchange system includes condenser, and exhaust steam-water heat-exchange system and shared one of Air-Water heat-exchange system are weary
Vapour cooler, the exhaust steam of condenser entrance enters vapour by entering the shell side of exhaust steam cooler with the connecting pipe of exhaust steam cooler
Mouthful, the shell side venthole bottom of exhaust steam cooler is connected with the first hot well；The delivery port of first hot well is by pipeline through booster pump
The second hot well set afterwards with condenser bottom is connected；Exhaust steam cooler is taken out by connecting pipe through electric check valve with unit
Vacuum system is connected, it is ensured that and maintain the vacuum state of exhaust steam cooler.
Two have been arranged in parallel on the circulating water pipeline that water charging system and exhaust steam cooler in Air-Water heat-exchange system are connected
On bar branch road, every branch road preceding stop valve, filter screen, closed cycle water pump, non-return valve and electricity are disposed with according to moisturizing direction
Dynamic stop valve.
Be disposed with the pipeline that first hot well is connected with the second hot well preceding stop valve, filter screen, booster pump, non-return valve and
Electric check valve.
Exhaust steam cooler is shell-and-tube steam water heat exchanger, and exhaust steam is walked in shell, and water is walked in pipe.
Vacuum tank and chemicals dosing plant are provided with circulating water pipeline.
Multiple pressure-measuring-points and temperature are provided with the connecting pipe of Air-Water heat-exchange system and exhaust steam-water heat-exchange system
Spend measuring point.
The utility model can reclaim the heat of exhaust steam in steam turbine, heat the cold wind of air preheater entrance, effectively utilize
The heat of exhaust steam, and reduce turbine back pressure, turbine efficiency is got a promotion；Make one, the two of air preheater entrance simultaneously
Secondary wind-warm syndrome is improved, it is therefore prevented that the low-temperature corrosion of air preheater simultaneously improves pulverizer capacity, and primary and secondary air is with higher
Heat is put into burner hearth, and fuel quantity is reduced needed for main steam absorbs same heat, and net coal consumption rate is reduced, and boiler efficiency is carried
Rise.
Brief description of the drawings
The utility model is described in further detail with reference to the accompanying drawings and detailed description.
Fig. 1 is overall structure diagram of the present utility model.
Fig. 2 is the structural representation of the utility model water side system.
In figure：1st, air preheater；2nd, electric check valve；3rd, First air steam air heater；4th, Secondary Air steam air heater；5th, First air
Blower fan；6th, Secondary Air blower fan；7th, exhaust steam cooler；8th, the first hot well；9th, condenser；10th, closed cycle water pump；11st, it is pressurized
Pump；12nd, non-return valve II；13rd, rear stop valve II；14th, pressure-measuring-point；15th, filter screen II；16th, preceding stop valve II；17th, temperature point；
18th, the second hot well；19th, unit pumped vacuum systems；20th, water charging system；21st, vacuum tank；22nd, chemicals dosing plant.
Embodiment
As shown in Fig. 1~Fig. 2, the utility model includes Air-Water heat-exchange system and exhaust steam-water heat-exchange system.Air-Water
Heat-exchange system includes exhaust steam cooler 7, water charging system 20, First air steam air heater 3 and Secondary Air steam air heater 4.Air-Water heat exchange system
System specific connected mode be：Water charging system 20 is connected by circulating water pipeline with the tube side water inlet of exhaust steam cooler 7, exhaust steam
Import header of the tube side delivery port of cooler 7 by pipeline respectively with First air steam air heater 3, Secondary Air steam air heater 4 is connected, and one
Secondary wind steam air heater 3, Secondary Air steam air heater 4 water outlet by outlet header draw after collect for a pipeline, the pipeline passes through moisturizing
The circulating water pipeline of system 20 is connected to form closed cycle with the tube side water inlet of exhaust steam cooler 7；Pacify on circulating water pipeline
Equipped with closed cycle water pump 10；First air steam air heater 3, Secondary Air steam air heater 4 respectively by the air supply duct of First air blower fan 5,
The air supply duct of Secondary Air blower fan 6 is connected with air preheater 1.
Water charging system 20 of the present utility model is connected by circulating water pipeline with Air-Water heat-exchange system, is set in the system
Closed cycle pump 10 is put as the drive device of the system；Moisturizing enters exhaust steam cooler after being pressurized through enclosed circulating pump 10 and inhaled
Heat, water after heat absorption enters the heat release of primary and secondary air steam air heater to heat cold wind by connecting pipe, the Amenorrhea again of the water after heat release
Formula circulating pump 10 enters exhaust steam cooler 7 and absorbed heat, and constitutes closed cycle, completes the process of heating air.Wherein, water is cold in exhaust steam
But the heat of exhaust steam release is absorbed in device 7 and the purpose that heat reaches heating cold wind is discharged in steam air heater.Water charging system 20
Having arrived maintenance water makes the hydronic effect of whole system, and closed cycle water pump 10, which is served, makes water overcome SR to complete
The effect of circulation.
The exhaust steam of steam turbine passes through connecting pipe and the phase of exhaust steam cooler 7 in exhaust steam of the present utility model-water heat-exchange system
Connection；Booster pump 11 is set to be used as drive device in the system.Exhaust steam enters exhaust steam cooler release heat simultaneously through connecting pipe
Condensation, the partial heat is condensed into water to heat the exhaust steam after the water in Air-Water heat-exchange system, release heat, and these coagulate
Bear water into after the first hot well 8 to certain water level of exhaust steam cooler bottom, turbine condenser is entered by booster pump 11
Second hot well 18, the water circulation of boiler-turbine is continued to complete with steam turbine condensate.
Exhaust steam-water heat-exchange system includes condenser 9, and exhaust steam-water heat-exchange system and shared one of Air-Water heat-exchange system are weary
Vapour cooler 7, specific connected mode is：The exhaust steam of the entrance of condenser 9 enters exhaust steam by the connecting pipe with exhaust steam cooler 7
The shell side air intake of cooler 7, the shell side venthole bottom of exhaust steam cooler 7 is connected with the first hot well 8；First hot well 8 goes out
The second hot well 18 that the mouth of a river is set by pipeline after booster pump 11 with the bottom of condenser 9 is connected；Exhaust steam cooler 7 passes through even
The first electric check valve of adapter road 2 is connected with unit pumped vacuum systems 19, it is ensured that and maintain the vacuum shape of exhaust steam cooler 7
State.Exhaust steam of the present utility model discharges the purpose that heat reaches heating Air-Water heat-exchange system reclaimed water in exhaust steam cooler 7.
Booster pump 11 serves the purpose for making water overcome SR to return to condenser hotwell.It is connected and plays with unit pumped vacuum systems 19
Maintenance exhaust steam cooler vacuum, it is ensured that exhaust steam can enter the purpose of exhaust steam cooler.
First air steam air heater 3 and Secondary Air steam air heater 4 parallel running of the present utility model, after being heated through exhaust steam cooler 7
Hot water shunting after respectively enter First air steam air heater 3, Secondary Air steam air heater 4, in First air steam air heater 3, Secondary Air steam air heater 4
Collect after middle heat release and absorbed heat into exhaust steam cooler 7.The utility model heats cold wind by reclaiming exhaust steam residual heat, wherein, it is weary
The vapour maximum amount of taking out 15%, substitutes auxiliary vapour heating cold wind, can save gross coal consumption rate 13g/kwh.
The circulating water pipe that water charging system 20 and exhaust steam cooler 7 in Air-Water heat-exchange system of the present utility model are connected
Stop valve I, filter screen I, enclosed according to moisturizing direction be disposed with before have been arranged in parallel on two branch roads, circulating water pipeline on road
Water circulating pump 10, non-return valve I and rear stop valve I.In addition, in exhaust steam of the present utility model-water heat-exchange system, the first hot well 8 with
Second hot well 18 connection pipeline on be disposed with before stop valve II 16, filter screen II 15, booster pump 11, non-return valve II 12 and after
Stop valve II 13.So often set system has all reserved standby branch road, and convenient maintenance or wherein one branch road are changed when damaging and used,
The overall progress of work is not influenceed.Wherein, rear stop valve I and rear stop valve II 13 use electric check valve, realize automation
Control；In addition, they are used cooperatively with preceding stop valve I, preceding stop valve II 16 respectively, control more accurate.It is of the present utility model weary
Vapour cooler 7 is shell-and-tube steam water heat exchanger, and exhaust steam is walked in shell, and water is walked in pipe.So two systems are separately run, each own
Independent operation pipeline, does not interfere with each other.
In addition, being provided with vacuum tank 21 and chemicals dosing plant 22 on circulating water pipeline, vacuum tank 21 is to maintain whole system
Pressure balance, the convenient addition to carrying out various reagents on circulating water pipeline of chemicals dosing plant 22.In order to further grasp this reality
With new running situation, the utility model is on the connecting pipe of Air-Water heat-exchange system and exhaust steam-water heat-exchange system
It is provided with multiple pressure-measuring-points 14 and temperature point 17.
The utility model alleviates that summer Air-cooled Unit back pressure is high, unit output is limited, net coal consumption rate to a certain extent
High the problem of.Exhaust steam discharges heat in exhaust steam cooler and is condensed into water and converges to hot well, is returned after being then pressurized through booster pump 11
To the second hot well 18 of condenser.Because water temperature is controllable in exhaust steam-water heat-exchange system, turbine back pressure can be reduced, compare enthalpy drop
Increase, turbine efficiency gets a promotion, net coal consumption rate reduction.The exhaust steam heat absorbed in Air-Water heat-exchange system is to heat
Primary and secondary air.The cold end wall temperature of the entrance of air preheater 1 is improved, prevents the wall temperature of air preheater 1 to be less than acid dew point, causes
Low-temperature corrosion.And heat, subsequently into boiler, makes boiler efficiency be improved with cold wind air inlet preheater 1.
Above-mentioned embodiment is not that, to limitation of the present utility model, the utility model is also not limited to the example above,
The variations, modifications, additions or substitutions that those skilled in the art are made in the range of the technical solution of the utility model,
Also protection domain of the present utility model is belonged to.
Claims (6)
1. a kind of reclaim the system that exhaust steam residual heat improves the thermal efficiency and unit on-load ability, it is characterised in that：It include air-
Water heat-exchange system and exhaust steam-water heat-exchange system；The Air-Water heat-exchange system includes exhaust steam cooler（7）, water charging system
（20）, First air steam air heater（3）With Secondary Air steam air heater（4）；The water charging system（20）It is cold with exhaust steam by circulating water pipeline
But device（7）Tube side water inlet connection, exhaust steam cooler（7）Tube side delivery port by pipeline respectively with First air steam air heater
（3）, Secondary Air steam air heater（4）Import header connection, First air steam air heater（3）, Secondary Air steam air heater（4）Water outlet by exporting
Header is collected after drawing for a pipeline, and the pipeline passes through water charging system（20）Circulating water pipeline and exhaust steam cooler（7）'s
Tube side water inlet is connected to form closed cycle；
Closed cycle water pump is installed on the circulating water pipeline（10）；The First air steam air heater（3）, Secondary Air steam air heater
（4）Pass through First air blower fan respectively（5）Air supply duct, Secondary Air blower fan（6）Air supply duct and air preheater（1）It is connected
Connect；
The exhaust steam-water heat-exchange system includes condenser（9）, exhaust steam-water heat-exchange system and Air-Water heat-exchange system share one
Exhaust steam cooler（7）, condenser（9）The exhaust steam of entrance by with exhaust steam cooler（7）Connecting pipe enter exhaust steam cooler
（7）Shell side air intake, exhaust steam cooler（7）Shell side venthole bottom be connected with the first hot well（8）；First hot well（8）'s
Delivery port is by pipeline through booster pump（11）Afterwards with condenser（9）The second hot well that bottom is set（18）It is connected；The exhaust steam
Cooler（7）By connecting pipe through the first electric check valve（2）With unit pumped vacuum systems（19）Connection, it is ensured that and remain weary
Vapour cooler（7）Vacuum state.
2. according to claim 1 reclaim the system that exhaust steam residual heat improves the thermal efficiency and unit on-load ability, its feature
It is：Water charging system in the Air-Water heat-exchange system（20）With exhaust steam cooler（7）It is in parallel on the circulating water pipeline of connection
Stop valve I, filter screen I, closed cycle water pump before being disposed with according to moisturizing direction are provided with two branch roads, every branch road
（10）, non-return valve I and rear stop valve I.
3. according to claim 1 reclaim the system that exhaust steam residual heat improves the thermal efficiency and unit on-load ability, its feature
It is：First hot well（8）With the second hot well（18）Stop valve II before being disposed with the pipeline of connection（16）, filter screen II
（15）, booster pump（11）, non-return valve II（12）With rear stop valve II（13）.
4. according to claim 1 reclaim the system that exhaust steam residual heat improves the thermal efficiency and unit on-load ability, its feature
It is：The exhaust steam cooler（7）For shell-and-tube steam water heat exchanger, exhaust steam is walked in shell, and water is walked in pipe.
5. according to claim 1 reclaim the system that exhaust steam residual heat improves the thermal efficiency and unit on-load ability, its feature
It is：Vacuum tank is provided with the circulating water pipeline（21）And chemicals dosing plant（22）.
6. according to claim 1 reclaim the system that exhaust steam residual heat improves the thermal efficiency and unit on-load ability, its feature
It is：Multiple pressure-measuring-points are provided with the connecting pipe of the Air-Water heat-exchange system and exhaust steam-water heat-exchange system（14）
And temperature point（17）.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620898538.3U CN206369220U (en) | 2016-08-18 | 2016-08-18 | It is a kind of to reclaim the system that exhaust steam residual heat improves the thermal efficiency and unit on-load ability |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620898538.3U CN206369220U (en) | 2016-08-18 | 2016-08-18 | It is a kind of to reclaim the system that exhaust steam residual heat improves the thermal efficiency and unit on-load ability |
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| CN206369220U true CN206369220U (en) | 2017-08-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106196147A (en) * | 2016-08-18 | 2016-12-07 | 北京慧峰仁和科技股份有限公司 | A kind of exhaust steam residual heat that reclaims improves the thermal efficiency and the system of unit on-load ability |
-
2016
- 2016-08-18 CN CN201620898538.3U patent/CN206369220U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106196147A (en) * | 2016-08-18 | 2016-12-07 | 北京慧峰仁和科技股份有限公司 | A kind of exhaust steam residual heat that reclaims improves the thermal efficiency and the system of unit on-load ability |
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