CN104948240A - Exhaust steam waste heat recycling system for small steam turbine of induced draft fan through circulating water based on steam turbine driving - Google Patents
Exhaust steam waste heat recycling system for small steam turbine of induced draft fan through circulating water based on steam turbine driving Download PDFInfo
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- CN104948240A CN104948240A CN201510292851.2A CN201510292851A CN104948240A CN 104948240 A CN104948240 A CN 104948240A CN 201510292851 A CN201510292851 A CN 201510292851A CN 104948240 A CN104948240 A CN 104948240A
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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 discloses an exhaust steam waste heat recycling system for a small steam turbine of an induced draft fan through circulating water based on steam turbine driving. An indirect cooling and heat exchange system of the exhaust steam waste heat recycling system is composed of a small turbine condenser, a heat exchanger, a primary air heat exchanger regulating valve, a circulating pump and a main machine condenser. An air pre-heater part exhaust gas heat recycling system is composed of an air pre-heater bypass system, a water supply system and a condensed water system. The small steam turbine exhausts steam into the small turbine condenser, and condensed water generated through condensation of the circulating water which is subjected to indirect cooling and heat exchange is discharged into the main machine condenser. The indirect cooling and heat exchange circulating water absorbs the steam exhaust heat of the small turbine condenser, the circulating pump is used for conducting forced circulation, and the heat exchanger is used for heating primary air and supply air. The circulating pump provides circulating power. An air supply system absorbs most of the steam exhaust heat of the small steam turbine. The primary air system can regulate the heat exchange amount by regulating the opening degree of a baffle according to the actual demand of the system. The exhaust steam waste heat recycling system can replace a primary air and air supply steam air heater which is generally arranged in a north power plant, and the circulating water is used for recycling the exhaust steam waste heat of the small steam turbine of the induced draft fan driven by the steam turbine.
Description
Technical field
The invention belongs to field of energy-saving technology, be specifically related to one and drive induced draught fan small turbine circulating water reclamation exhausted spare heat system based on vapour.
Background technique
It is adopted technology in recent years that Induced Draft Fan in Coal-fired Power adopts small turbine to drive, and object saves station service.Induced draught fan adopts the existing two schemes of Steam Turbine Driven, and one is pure condensed steam formula scheme, and induced draught fan Turbine Steam source is taken from 4 and taken out, and induced draught fan steam turbine heat is recycled water-band and walks; Two is back pressure machine schemes, and the cold outlet header again of boiler is taken from induced draught fan Turbine Steam source, and exhaust steam heat can be used for industrial load, be used for heating oxygen-eliminating device or heat-setting water and feedwater.For preventing the cold end corrosion of boiler air preheater, heating device is installed in the outlet of northern power plant primary air fan and gas fan export requirement additional, and vapour source is taken from main steam turbine 5 and taken out or 6 to take out.
But prior art induced draught fan steam turbine is as adopted condensed steam type, and the heat that circulating water is taken away cannot utilize, and causes induced draught fan turbine discharge heat loss.Draw gas with main steam turbine and add heat primary air and air-supply, cause main steam turbine to do work and reduce, Economy reduces.
Summary of the invention
For solving the existing shortcoming of above-mentioned technology, main purpose of the present invention is that providing a kind of drives induced draught fan small turbine circulating water reclamation exhausted spare heat system based on vapour, circulating water reclamation vapour can be utilized to drive induced draught fan small steam turbine exhaust steam waste heat, the too low air preheater cold end corrosion caused of ambient temperature can be avoided again.
For reaching above-described object, one of the present invention is driven induced draught fan small turbine circulating water reclamation exhausted spare heat system based on vapour and is taked following technological scheme:
A kind of drive induced draught fan small turbine circulating water reclamation exhausted spare heat system based on vapour, comprise induced draught fan small turbine 1, gas fan 2, primary air fan 3, air preheater 4, circulating water pipeline 7 is characterized in that: it also comprises indirect cooling heat-exchanging system 5 and air preheater partial fume heat recovery system 6; Described indirect cooling heat-exchanging system 5 by little machine vapour condenser 51, heat exchanger 52, First air heat exchange modulating valve 53, recycle pump 54, little machine condenser level control valve 55, main frame vapour condenser 56 and little machine vacuum pump 57 form; Described air preheater partial fume heat recovery system 6 is by gas proportioning damper 61, form to water-to-water heat exchanger 62, water of condensation heat exchanger 63; Pipeline from induced draught fan small turbine 1 to air preheater 4 is provided with little machine vapour condenser 51, recycle pump 54, heat exchanger 52, First air heat exchange modulating valve 53 according to this, and described induced draught fan small turbine 1 is connected with little machine vapour condenser 51 by pipeline; Described little machine vapour condenser 51 is connected by pipeline with vacuum pump 57 respectively; Described little machine vapour condenser 51 is communicated with main frame vapour condenser 56 by little machine condenser level control valve 55; Described little machine vapour condenser 51 is also communicated with water circulating pipe 7a, and described water circulating pipe 7a is provided with recycle pump 54; Described water circulating pipe 7a is connected with heat exchanger 52a; Described water circulating pipe 7a is connected with water circulating pipe 7b, and described water circulating pipe 7b is connected with heat exchanger 52b, which is provided with First air heat exchange modulating valve 53; Described heat exchanger 52a is connected by pipeline with gas fan 2, and described heat exchanger 52b is connected by pipeline with primary air fan 3, and the air-supply of heating subsequently, First air enter in air preheater 4; The pipeline of described air preheater 4 bypass is provided with according to this gas proportioning damper 61, to water-to-water heat exchanger 62, water of condensation heat exchanger 63.
Described gas fan 2, primary air fan 3 can be placed on heat exchanger 52 entrance or outlet.
Described induced draught fan small turbine 1 adopts steam-operating to drive; Described primary air fan 3 and gas fan 2 are motorized motions.
When reclaiming small steam turbine exhaust steam waste heat, induced draught fan small turbine 1 steam discharge to drain in little machine vapour condenser 51, condensed hydrophobic by circulating water pipeline 7 in recycle pump 54 inflow heat exchanger 52, to add heat primary air and air-supply; Recycle pump provides circulation power, and First air, according to system actual demand, adjusts heat exchange amount by regulating the change of First air heat exchange modulating valve 53 aperture; Exhausted spare heat major part heat is reclaimed in air-supply.
When reclaiming air preheater smoke discharging residual heat, it is other that air preheater partial fume heat recovery system 6 is arranged on air preheater 4, by reclaiming boiler exhaust gas waste heat to water-to-water heat exchanger 62, water of condensation heat exchanger 63, arrange into large extracted steam from turbine simultaneously, increase generator output when not increasing fuel, thus complete exhausted spare heat callback course.
Adopt the present invention of as above technological scheme, there is following beneficial effect:
This scheme can substitute First air, the air-supply heating device that northern power plant is generally arranged, and circulating water reclamation vapour can be utilized to drive induced draught fan small steam turbine exhaust steam waste heat, can avoid again the too low air preheater cold end corrosion caused of ambient temperature.Gross coal consumption rate 3-5g/kWh can be reduced, energy-saving effect highly significant.
Meanwhile, on system, to Air-cooled Unit, can reduce indirect air cooling island radiating fin area needed for induced draught fan small turbine, air cooling tower can suitably diminish, height reduction, and air cooling tower civilwork engineering quantity also reduces.Add simultaneously induced draught fan turbine discharge to First air and air-supply heat exchanger pipeline, because this pipeline is shorter, expense increase is not high.First air is larger than conventional scheme with air-supply heat exchanger area.From engineering examine and make cuts and increase expense totally, significantly can reduce engineering cost.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
In figure, 1-induced draught fan small turbine, 2-gas fan, 3-primary air fan, 4-air preheater, the indirect cooling heat-exchanging system of 5-, the little machine vapour condenser of 51-, 52-heat exchanger, 53-First air heat exchange modulating valve, 54-recycle pump, the little machine condenser level control valve of 55-, 56-main frame vapour condenser, the little machine vacuum pump of 57-, 6-air preheater partial fume heat recovery system, 61-gas proportioning damper, 62-to water-to-water heat exchanger, 63-water of condensation heat exchanger, 7-circulating water pipeline.
Embodiment
In order to further illustrate the present invention, be described further below in conjunction with accompanying drawing:
As shown in Figure 1, the present invention drives induced draught fan small turbine circulating water reclamation exhausted spare heat system for a kind of based on vapour, steam-driven induced draft fan small turbine 1 exhausted spare heat is by indirect cooling heat-exchanging system 5 heating boiler First air and air-supply, and gas fan 2, primary air fan 3 can be placed on heat exchanger 52 entrance or outlet.Most of heat is reclaimed in air-supply, improves wind pushing temperature to 70-90 DEG C.First air, according to system actual demand, adjusts heat exchange amount by regulating the change of First air heat exchange modulating valve 53 aperture.In little machine vapour condenser, the hydrophobic of condensation is drained in main frame vapour condenser 56 by little machine condenser level control valve 55.Normal operation period, because the pressure in little machine vapour condenser is higher than main frame vapour condenser, hydrophobic under the effect of pressure reduction, flow to main frame vapour condenser, maintain the stable of little machine vapour condenser water level by the aperture adjusting little machine condenser level control valve 55.
Induced draught fan steam turbine 1 waste heat must cause air preheater 4 temperature of exhaust fume to raise after being used for adding heat primary air and air-supply.For reducing air preheater 4 temperature of exhaust fume, be arranged through to water-to-water heat exchanger 62, water of condensation heat exchanger 63 on air preheater 4 side, reclaim boiler exhaust gas waste heat, arrange into large extracted steam from turbine simultaneously, increase generator output when not increasing fuel, thus complete exhausted spare heat callback course.
Embodiment one (application of newly-built coal-burning power plant)
Induced draught fan capacity is comparatively large, adopting steam-operating to drive, for convenience of starting, establishing the electronic startup induced draught fan of 1 30-50% capacity simultaneously; Primary air fan 3 and gas fan 2 are motorized motions.When unit load is raised to 30-50% load, induced draught fan switches to small turbine and drives, and induced draught fan small turbine 1 exhaust steam heat adds heat primary air and air-supply through indirect cooling heat-exchanging system, reclaims this part exhaust steam heat.
After induced draught fan steam turbine 1 waste-heat First air 3 and air-supply 2, boiler air preheater 4 temperature of exhaust fume must be caused to raise.For reducing air preheater 4 temperature of exhaust fume, by establishing bypass to water-to-water heat exchanger 62, water of condensation heat exchanger 63 recovery boiler smoke discharging residual heat at air preheater 4, squeeze large extracted steam from turbine simultaneously, play energy-conserving action, simultaneously increase generator output not increasing under fuel conditions.
To Air-cooled Unit, induced draught fan small turbine 1 circulating water can be removed, little machine vapour condenser 51 and the corresponding pipeline reducing this component loops water, reduce recycle pump 54 capacity and indirect air cooling island radiating fin area, air cooling tower can suitably diminish, height reduction, and air cooling tower civilwork engineering quantity also reduces.Add the pipeline of indirect cooling heat-exchanging system, because this system pipeline is shorter, expense increase is not high simultaneously; First air is larger than conventional heating device scheme with air-supply heat exchanger area.From engineering examine and make cuts and increase expense totally, significantly can reduce engineering cost.
To wet type cooling unit, except with except air cooling tower part correlative charges, the same with Air-cooled Unit, reduce expenses generally lower than Air-cooled Unit.
Embodiment two (to the application of enlarging coal-burning power plant)
Due to existing external auxiliary steam, only can establish steam-driven induced draft fan, remove electronic startup induced draught fan, steam-driven induced draft fan directly starts when unit starting.
When reclaiming small turbine waste heat, induced draught fan small turbine 1 steam discharge to drain in little machine vapour condenser 51, condensed hydrophobic by circulating water pipeline 7 in recycle pump 54 inflow heat exchanger 52, to add heat primary air and air-supply; Recycle pump provides circulation power, and First air, according to system actual demand, adjusts heat exchange amount by regulating the change of First air heat exchange modulating valve 53 aperture; Exhausted spare heat major part heat is reclaimed in air-supply.
When reclaiming air preheater smoke discharging residual heat, it is other that air preheater partial fume heat recovery system 6 is arranged on air preheater 4, by reclaiming boiler exhaust gas waste heat to water-to-water heat exchanger 62, water of condensation heat exchanger 63, arrange into large extracted steam from turbine simultaneously, increase generator output when not increasing fuel, thus complete exhausted spare heat callback course.
Embodiment three (to in-service Air-cooled Unit technological transformation application)
To clammy in-service unit, domestic by induced draught fan by motoring change into small turbine drive have example, object be reduce station service power consumption rate, improve to grid power transmission amount.But to Air-cooled Unit, due to the restriction of Air-Cooling Island capacity and place restriction, utilize existing Air-Cooling Island nargin or newly-built induced draught fan Air-Cooling Island all impossible, the in-service unit of current domestic air cooling does not also have induced draught fan to change steam-operating case.
But induced draught fan small turbine 1 exhausted spare heat is guided to First air 3 through indirect cooling heat-exchanging system, blow 2 heat exchanger 52 places, as air cooling apparatus by blower fan heat exchanger 52, blower fan heating device 52 is transformed, just can realize induced draught fan and change Steam Turbine Driven by electronic.There is higher energy-conservation and saving station service effect simultaneously, increase to electrical network conveying electricity under adding same load, remarkable in economical benefits.
The present invention's one drives induced draught fan small turbine circulating water reclamation exhausted spare heat system based on vapour, system exhausted spare heat can be recycled, again can be cost-saving, from construction investment and income, has very high economic income rate.Native system can run throughout the year, can reduce gross coal consumption rate 3-5g/kWh, energy-saving effect highly significant.On system, to Air-cooled Unit, add the pipeline of indirect cooling heat-exchanging system, because this system pipeline is shorter, expense increase is not high; First air is larger than conventional heating device scheme with air-supply heat exchanger area.From construction investment and income, still there is very high economic income rate.
Claims (4)
1. drive an induced draught fan small turbine circulating water reclamation exhausted spare heat system based on vapour, comprise induced draught fan small turbine (1), gas fan (2), primary air fan (3), air preheater (4), circulating water pipeline (7) is characterized in that: it also comprises indirect cooling heat-exchanging system (5) and air preheater partial fume heat recovery system (6); Described indirect cooling heat-exchanging system (5) is by little machine vapour condenser (51), heat exchanger (52), First air heat exchange modulating valve (53), the little machine vacuum pump (57) of recycle pump (54), little machine condenser level control valve (55), main frame vapour condenser (56) and composition; Described air preheater partial fume heat recovery system (6) is by gas proportioning damper (61), form to water-to-water heat exchanger (62), water of condensation heat exchanger (63); Pipeline from induced draught fan small turbine (1) to air preheater (4) is provided with little machine vapour condenser (51), recycle pump (54), heat exchanger (52), First air heat exchange modulating valve (53) according to this, and described induced draught fan small turbine (1) is connected with little machine vapour condenser (51) by pipeline; Described little machine vapour condenser (51) is connected by pipeline with vacuum pump (57) respectively; Described little machine vapour condenser (51) is also communicated with water circulating pipe (7) a, and described water circulating pipe (7) a is provided with recycle pump (54); Described water circulating pipe (7) a is connected with heat exchanger (52) a; Described water circulating pipe (7) a is connected with water circulating pipe (7) b, and described water circulating pipe (7) b is connected with heat exchanger (52) b, which is provided with First air heat exchange modulating valve (53); Described heat exchanger (52) a is connected by pipeline with gas fan (2), described heat exchanger (52) b is connected by pipeline with primary air fan (3), and the air-supply of heating subsequently, First air enter in air preheater (4); The pipeline of described air preheater (4) bypass is provided with according to this gas proportioning damper (61), to water-to-water heat exchanger (62), water of condensation heat exchanger (63).
2. according to claim 1ly drive induced draught fan small turbine circulating water reclamation exhausted spare heat system based on vapour, it is characterized in that: described gas fan (2), primary air fan (3) are placed on heat exchanger (52) entrance or outlet.
3. according to claim 1 and 2ly drive induced draught fan small turbine circulating water reclamation exhausted spare heat system based on vapour, it is characterized in that: described induced draught fan small turbine (1) adopts steam-operating to drive; Described primary air fan (3) and gas fan (2) are motorized motions.
4. utilize circulating water for a power-economizing method for communication medium recycling exhausted spare heat, it is characterized in that comprising the following steps:
1) when reclaiming small steam turbine exhaust steam waste heat, induced draught fan small turbine (1) steam discharge drains in little machine vapour condenser (51), condensed hydrophobic by circulating water pipeline (7) in recycle pump (54) inflow heat exchanger (52), to add heat primary air and air-supply; Recycle pump provides circulation power, and First air is according to system actual demand, and by regulating First air heat exchange modulating valve (53) aperture change adjustment heat exchange amount, exhausted spare heat major part heat is reclaimed in air-supply;
2) when reclaiming air preheater smoke discharging residual heat, it is other that air preheater partial fume heat recovery system (6) is arranged on air preheater (4), by reclaiming boiler exhaust gas waste heat to water-to-water heat exchanger (62), water of condensation heat exchanger (63), arrange into large extracted steam from turbine simultaneously, increase generator output when not increasing fuel, thus complete exhausted spare heat callback course.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105889897A (en) * | 2016-01-29 | 2016-08-24 | 中国电力工程顾问集团西北电力设计院有限公司 | Comprehensive recycling system and method of waste heat in thermal power plant |
| CN107152316A (en) * | 2017-07-13 | 2017-09-12 | 中国能源建设集团湖南省电力设计院有限公司 | A kind of gradient utilization system of steam energy |
| CN109297074A (en) * | 2018-09-17 | 2019-02-01 | 国网湖南省电力有限公司 | The control method and system of the small steam turbine steam discharge heating system of back pressure type steam-driven induced draft fan |
| CN109443033A (en) * | 2018-10-18 | 2019-03-08 | 华电电力科学研究院有限公司 | A kind of method and device that Direct Air-cooled Unit exhausted spare heat is recycled to boiler supply air system |
| CN109469523A (en) * | 2018-12-29 | 2019-03-15 | 西安西热节能技术有限公司 | A kind of system entering furnace fresh air using condensing-type small steam turbine exhaust steam waste-heat |
| CN112302986A (en) * | 2020-10-29 | 2021-02-02 | 西安西热节能技术有限公司 | Method for measuring efficiency of independent condensing steam-driven draught fan |
| CN113107878A (en) * | 2021-04-08 | 2021-07-13 | 西安热工研究院有限公司 | Double-fed system-based primary frequency modulation electric induced draft fan system of wet cooling unit |
| CN113107879A (en) * | 2021-04-08 | 2021-07-13 | 西安热工研究院有限公司 | Double-fed system-based primary fan system of wet cooling unit |
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| CN109469523A (en) * | 2018-12-29 | 2019-03-15 | 西安西热节能技术有限公司 | A kind of system entering furnace fresh air using condensing-type small steam turbine exhaust steam waste-heat |
| CN112302986A (en) * | 2020-10-29 | 2021-02-02 | 西安西热节能技术有限公司 | Method for measuring efficiency of independent condensing steam-driven draught fan |
| CN112302986B (en) * | 2020-10-29 | 2022-07-08 | 西安西热节能技术有限公司 | Method for measuring efficiency of independent condensing steam-driven draught fan |
| CN113107878A (en) * | 2021-04-08 | 2021-07-13 | 西安热工研究院有限公司 | Double-fed system-based primary frequency modulation electric induced draft fan system of wet cooling unit |
| CN113107879A (en) * | 2021-04-08 | 2021-07-13 | 西安热工研究院有限公司 | Double-fed system-based primary fan system of wet cooling unit |
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Application publication date: 20150930 |
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