CN205261526U - Steam power plant's heat supply steam superheating degree of heating boiler overgrate air utilizes system - Google Patents
Steam power plant's heat supply steam superheating degree of heating boiler overgrate air utilizes system Download PDFInfo
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- CN205261526U CN205261526U CN201521100152.5U CN201521100152U CN205261526U CN 205261526 U CN205261526 U CN 205261526U CN 201521100152 U CN201521100152 U CN 201521100152U CN 205261526 U CN205261526 U CN 205261526U
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- 238000005516 engineering process Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 238000009998 heat setting Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
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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 utility model relates to a steam power plant's heat supply steam superheating degree of heating boiler overgrate air utilizes system, including low temperature steam unit, air heater, high -temperature steam unit, primary air fan and overfire air fan, the overfire air fan low temperature steam unit air heater reaches the high -temperature steam unit is the series connection in proper order, the primary air fan with the air heater series connection. The utility model discloses utilize the hot overgrate air of the super -heated rate heating boiler of elder generation of external heat supply steam, high -quality heat is brought into furnace through the overgrate air to the cold overgrate air of heating boiler again, has reduced boiler fuel consumption, has improved coal -fired heat supply unit's energy conversion efficiency.
Description
Technical field
The utility model relates to steam power plant's heating steam degree of superheat and utilizes technical field, particularly relates to heating kettleSteam power plant's heating steam degree of superheat of stove Secondary Air is utilized system.
Background technology
Country encourages develop actively cogeneration of heat and power, encourages the area satisfying the requirements by building back pressure type thermoelectric perpetual motion machineThe coal-fired little thermoelectricity unit of the modes such as group, the large-scale thermoelectricity unit of high-efficiency cleaning backwardness high to energy consumption, that pollution is heavy is realExecute alternative. In industrial park, various places and Industrial agglomeration district or the existing pure condensate generating set of periphery or heating boiler,Encouragement transform that taking out of reasonable heat supplying scale is solidifying as, back pressure type cogeneration units or distributed energy station be as collectionMiddle heat source point. To the year two thousand twenty, China's coal-fired thermal power unit installed capacity accounts for coal electricity total installation of generating capacity proportionStrive reaching 28%.
Along with the maximization of China's heat supply unit, 300MW and above heat supply unit will become the main force of China's heat supplyUnit. The strict efficiency access threshold of controlling of country, 300MW and above heat supply unit adopt overcritical ginseng in principleNumber. Except newly-increased special heat supply unit, country advocates the heat supply transformation of the condensing unit of having gone into operation energetically.In order to adapt to the needs of unit peaking operation, the steam parameter of extracting out from heat supply unit is often used higher than actual heatThe parameter of family demand, therefore must draw gas and offer hot user after pressure and temperature reducing again heat supply. Steam temperature reducingThe process of decompression is exactly the process of the steam energy level of reduction, will reduce the generating efficiency of heat supply unit.
Reducing the simplest equipment of external heating steam pressure and temperature is reducing-and-cooling plant, but its work shapeCondition is very severe, and the temperature difference and pressure reduction are large, easily causes inner tube fracture and the inner tube depression of reducing-and-cooling plant, makesDevice systems cannot normally move or greatly reduce service life.
Reducing the outer degree of superheat for steam by external steam condenser utilization feedwater is from thermodynamicsEconomic method. With the outer degree of superheat heated feed water for steam, can improve final feed temperature, reduction machineThe generated energy of the heat consumption rate of group or increase unit. But the shell-side operating temperature of steam condenser is very high, pipeLateral pressure is 4～9 times of shell pressure, steam condenser, pipeline, pipe fitting and appurtenances (as suspension and support,Valve actuator etc.) the other large complexity of structure, cost is high.
Summary of the invention
The purpose of this utility model is to provide a kind of steam power plant's heating steam degree of superheat of heating boiler Secondary AirUtilize system, when reducing equipment manufacturing cost, can effectively utilize the degree of superheat of heating steam, improve coal-fired confessionThe energy conversion efficiency of heat engine group.
The purpose of this utility model is achieved in that
Steam power plant's heating steam degree of superheat of heating boiler Secondary Air is utilized a system, comprises Low Temperature Steam listUnit, air preheater, high-temperature steam unit, primary air fan and overfire air fan, described overfire air fan, described inLow Temperature Steam unit, described air preheater and described high-temperature steam unit are connected in series successively, once describedBlower fan and described air preheater are connected in series.
Below further technical scheme is described:
Further, also comprise hot user, described Low Temperature Steam unit comprises low temperature vapour hot-air heater, described inHigh-temperature steam unit comprises high temperature vapour hot-air heater, the shell of described overfire air fan and described low temperature vapour hot-air heaterSide is communicated with, and pipe side one end of described low temperature vapour hot-air heater is connected with described hot user, the other end and described heightThe pipe side of temperature vapour hot-air heater connects, two of the shell-side of described low temperature vapour hot-air heater and described air preheaterInferior wind inlet connects, and the Secondary Air outlet of described air preheater connects with the shell-side of described high temperature vapour hot-air heaterConnect, and the pipe side of described high temperature vapour hot-air heater is communicated with steam turbine heat supply extraction line.
Further, described Low Temperature Steam unit also comprises low temperature bypass steam temperature control valve, described low temperature vapour gasHeater and described low temperature bypass steam temperature control valve are connected in parallel.
Further, described Low Temperature Steam unit also comprises the first isolating valve and the second isolating valve, described firstThe pipe side of isolating valve, described low temperature vapour hot-air heater and described the second isolating valve are connected in series successively.
Further, described high-temperature steam unit also comprises described high temperature bypass steam temperature control valve, described high temperatureVapour hot-air heater and described high temperature bypass steam temperature control valve are connected in parallel.
Further, described high-temperature steam unit also comprises the 3rd isolating valve and the 4th isolating valve, the described the 3rdThe pipe side of isolating valve, described high temperature vapour hot-air heater and described the 4th isolating valve are connected in series successively.
Compared with prior art, the utlity model has following beneficial effect:
(1) external heating steam heating boiler secondary air system of the present utility model, effectively utilizes steam turbine to returnThe heat of hot system, reduces boiler oil consumption, improves the energy conversion efficiency of coal heating unit.
(2) compared with the traditional scheme that installs external steam condenser additional, the utility model will be used for originallyThe steam of external steam condenser shell-side is introduced the pipe side of vapour hot-air heater, and Secondary Air is introduced to the heating of vapour gasDevice shell-side, has significantly reduced the power pressure of pipe side and shell-side, makes heat exchanger heat absorbing side, heat release sideAnd the piping being connected and manufacture cost of parts significantly decline.
(3) the utility model can effectively utilize boiler reheated steam to come external heat supply, unnecessary high level heatRecycled by steam power plant oneself, avoided utilizing the heat supply of reheater inlet steam, cause the cooling steaming of reheaterVapour quantity not sufficient and cause heating surface to occur overheating problem.
(4) the utility model adopt the air preheater Secondary Air that enters and export to be used for absorbing to draw gas overheatedDegree, and heat of high temperature is returned to burner hearth, can significantly improve secondary air temperature, strengthening boiler combustion, strengthens unitThe stability that when underrun, boiler catches fire.
Brief description of the drawings
Fig. 1 is the heating steam degree of superheat utilization system of the heating boiler Secondary Air described in the utility model embodimentThe structural representation of system.
Description of reference numerals:
100, Low Temperature Steam unit, 120, low temperature vapour hot-air heater, 140, low temperature bypass steam temperature control valve,160, the first isolating valve, 180, the second isolating valve, 200, air preheater, 300, high-temperature steam unit,320, high temperature vapour hot-air heater, 340, high temperature bypass steam temperature control valve, 360, the 3rd isolating valve, 380,The 4th isolating valve, 400, primary air fan, 500, overfire air fan, 600, hot user.
Detailed description of the invention
Below in conjunction with accompanying drawing, embodiment of the present utility model is elaborated:
As shown in Figure 1, a kind of heating steam degree of superheat of heating boiler Secondary Air is utilized system, comprises low temperatureSteam unit 100, air preheater 200, high-temperature steam unit 300, primary air fan 400 and overfire air fan500, described overfire air fan 500, described Low Temperature Steam unit 100, described air preheater 200 and described inHigh-temperature steam unit 300 is connected in series successively, and described primary air fan 400 is gone here and there with described air preheater 200Connection connects.
Wherein, by described overfire air fan 500, described Low Temperature Steam unit 100, described air preheater 200And described high-temperature steam unit 300 is connected in series to form steam power plant's heat supply of this heating boiler Secondary Air successivelySteam superheat utilizes system, can effectively utilize the heat of Steam Turbine Regenerative System, reduces boiler oil and disappearsConsumption, the energy conversion efficiency of raising coal heating unit. In addition the outlet of described air preheater 300,Secondary Air directly enter described high temperature vapour hot-air heater 320 and further heat, finally enter again boiler and participate inBurning; If externally heating steam needs further cooling after described high temperature vapour hot-air heater 320 is cooling,Enter described low temperature vapour hot-air heater 120, externally supply through the cooling steam afterwards of two-stage vapour hot-air heaterHeat, its degree of superheat has obtained utilization.
If externally heating steam temperature requirement is lower, the inlet steam temperature of described high temperature vapour hot-air heater 320Degree exceedes 340 DEG C, should first use described high temperature vapour hot-air heater 320 to carry out desuperheat, steams with described high temperatureVapour carrys out heat hot Secondary Air, then considers to use the further desuperheat of described low temperature vapour hot-air heater 120, comes with thisRationally utilize the energy level of steam.
The condition of work of described high temperature vapour hot-air heater 320 and described low temperature vapour hot-air heater 120 and traditionalExternal steam condenser is compared, and pipe side is born steam pressure, and far below the latter's feed pressure, shell-side holdsBe subject to secondary wind pressure, far below the latter's steam pressure, therefore the cost of two vapour hot-air heaters is far below externalFormula steam condenser. The outlet Secondary Air that external heating steam heats described air preheater 200 can improve potThe combustion position of stove, the entrance Secondary Air that heats described air preheater 200 can improve described air preheatThe air themperature of the secondary air inlet end of device 200, reduces the flue gas heat demand of described air preheater 200Amount, and its exit gas temperature raises to some extent, and smoke discharging residual heat can pass through the side of low-level (stack-gas) economizer heat-setting waterFormula reclaims. The outlet secondary air temperature of described air preheater 200 reaches 320 DEG C conventionally, the external confession of high levelVapours part heat is brought into burner hearth by Secondary Air, has reduced boiler oil consumption, has improved coal heatingThe energy conversion efficiency of unit.
Two vapour hot-air heater pipe sides are imported and exported pipeline and are equipped with isolating valve, and isolating valve cuts out vapour hot-air heaterOut of service, open and put into operation. Described high temperature vapour hot-air heater 320 inlet steam temperature exceed it and enterMouth Secondary Air temperature just allows to put into operation, and the intake air temperature of described low temperature vapour hot-air heater 120 is lower,Can not be subject to the restriction of this condition. In addition, if externally heating steam need to be at described low temperature vapour hot-air heater 120When significantly cooling and heating steam amount are larger, Secondary Air is larger in the temperature rise of low temperature vapour hot-air heater, describedThe temperature rise of air preheater 200 is less, and the outlet exhaust gas temperature of described air preheater 200 is higher, occursThis extreme case needs to take measures to reclaim the fume afterheat that described air preheater 200 is discharged.
Further, also comprise hot user, described Low Temperature Steam unit 100 comprises low temperature vapour hot-air heater 120,Described high-temperature steam unit 300 comprises high temperature vapour hot-air heater 320, described overfire air fan 500 and described low temperatureThe shell-side of vapour hot-air heater 120 is communicated with, and pipe side one end of described low temperature vapour hot-air heater 120 and described heat are usedFamily 600 connects, and the other end is connected with the pipe side of described high temperature vapour hot-air heater 320, and described low temperature vapour gas addsThe shell-side of hot device 120 is connected with the secondary air inlet of described air preheater 200, described air preheater 200Secondary Air outlet be connected with the shell-side of described high temperature vapour hot-air heater 300, and described high temperature vapour hot-air heater300 pipe side is communicated with steam turbine heat supply extraction line.
Cold air is first through entering described low temperature vapour hot-air heater 120 after described overfire air fan 500 pressurizations againHeat, enter subsequently described air preheater 200 and complete main heating process, pre-from described airAnd then the hot Secondary Air that hot device 200 exports enters described high temperature vapour hot-air heater 320 and continues heating, due toSecondary air temperature is more high is more conducive to boiler combustion, and therefore described high temperature vapour hot-air heater 320 can be by heating steamTemperature is reduced to and approaches 340 DEG C, has utilized most degrees of superheat of heating steam.
Please refer to Fig. 1, in the present embodiment, externally heating steam can also can be from pot from drawing gas of steam turbineStove reheated steam, first enters described high temperature vapour hot-air heater 320 and completes main desuperheating process, with laggardEnter described low temperature vapour hot-air heater 120 further desuperheat as required, due to described low temperature vapour hot-air heater 120The wind-warm syndrome of entrance Secondary Air very low, and air quantity is very large, therefore generally external heat supply can be steamedVapour is cooled to needed temperature, and the limiting case that may occur is that Secondary Air is at described air preheater 200Temperature rise be zero.
Described high-temperature steam unit 300 also comprises described high temperature bypass steam temperature control valve 340, described high temperature vapour gasHeater 320 is connected in parallel with described high temperature bypass steam temperature control valve 340. By described high temperature bypass steam temperatureControl valve 340 regulates and enters the steam flow of described high temperature vapour hot-air heater 320, thereby guarantees external heat supplyThe temperature of steam meets user's needs.
Further, described high-temperature steam unit 300 also comprises the 3rd isolating valve 360 and the 4th isolating valve 380,The pipe side of described the 3rd isolating valve 360, described high temperature vapour hot-air heater 320 and described the 4th isolating valve 380 are complied withInferior being connected in series, facilitates the inspection and maintenance of described high temperature vapour hot-air heater 320.
In addition, described Low Temperature Steam unit 100 also comprises low temperature bypass steam temperature control valve 140, described low temperature vapourHot-air heater 120 is connected in parallel with described low temperature bypass steam temperature control valve 140, can realize controlling entering instituteState the steam flow of low temperature vapour hot-air heater 120, thereby further guarantee that the temperature of external heating steam meetsUser's needs.
Further, described Low Temperature Steam unit also wraps 100 and draws together the first isolating valve 160 and the first isolating valve 160,The pipe side of described the first isolating valve 160, described low temperature vapour hot-air heater 120 and described the second isolating valve 180 are complied withInferior being connected in series, facilitates the inspection and maintenance of described low temperature vapour hot-air heater 120.
Each technical characterictic of the above embodiment can combine arbitrarily, for making to describe succinctly, not rightThe all possible combination of each technical characterictic in above-described embodiment is all described, but, as long as these skillsThere is not contradiction in the combination of art feature, is all considered to be the scope that this description is recorded.
The above embodiment has only expressed a kind of embodiment of the present utility model, its describe comparatively concrete andIn detail, but can not therefore be interpreted as the restriction to utility model patent scope. It is right to it should be pointed out thatIn those of ordinary skill in the art, without departing from the concept of the premise utility, can also doGo out some distortion and improvement, these all belong to protection domain of the present utility model. Therefore, the utility model is specialThe protection domain of profit should be as the criterion with claims.
Claims (6)
1. steam power plant's heating steam degree of superheat of heating boiler Secondary Air is utilized a system, it is characterized in that,Comprise Low Temperature Steam unit, air preheater, high-temperature steam unit, primary air fan and overfire air fan, described inConnect successively in overfire air fan, described Low Temperature Steam unit, described air preheater and described high-temperature steam unitConnect, described primary air fan and described air preheater are connected in series.
2. the heating steam degree of superheat utilization system of steam power plant of heating boiler Secondary Air according to claim 1System, is characterized in that, also comprise hot user, described Low Temperature Steam unit comprises low temperature vapour hot-air heater, instituteState high-temperature steam unit and comprise high temperature vapour hot-air heater, described overfire air fan and described low temperature vapour hot-air heaterShell-side be communicated with, pipe side one end of described low temperature vapour hot-air heater is connected with described hot user, the other end and described inThe pipe side of high temperature vapour hot-air heater connects, the shell-side of described low temperature vapour hot-air heater and described air preheaterSecondary air inlet connects, the Secondary Air outlet of described air preheater and the shell-side of described high temperature vapour hot-air heaterConnect, and the pipe side of described high temperature vapour hot-air heater is communicated with steam turbine heat supply extraction line.
3. the heating steam degree of superheat utilization system of steam power plant of heating boiler Secondary Air according to claim 2System, is characterized in that, described Low Temperature Steam unit also comprises low temperature bypass steam temperature control valve, described low temperature vapourHot-air heater and described low temperature bypass steam temperature control valve are connected in parallel.
4. the heating steam degree of superheat utilization system of steam power plant of heating boiler Secondary Air according to claim 3System, is characterized in that, described Low Temperature Steam unit also comprises the first isolating valve and the second isolating valve, described theThe pipe side of one isolating valve, described low temperature vapour hot-air heater and described the second isolating valve are connected in series successively.
5. the heating steam degree of superheat utilization system of steam power plant of heating boiler Secondary Air according to claim 2System, is characterized in that, described high-temperature steam unit also comprises described high temperature bypass steam temperature control valve, described heightTemperature vapour hot-air heater and described high temperature bypass steam temperature control valve are connected in parallel.
6. the heating steam degree of superheat utilization system of steam power plant of heating boiler Secondary Air according to claim 5System, is characterized in that, described high-temperature steam unit also comprises the 3rd isolating valve and the 4th isolating valve, described theThe pipe side of three isolating valves, described high temperature vapour hot-air heater and described the 4th isolating valve are connected in series successively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201521100152.5U CN205261526U (en) | 2015-12-23 | 2015-12-23 | Steam power plant's heat supply steam superheating degree of heating boiler overgrate air utilizes system |
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| CN201521100152.5U CN205261526U (en) | 2015-12-23 | 2015-12-23 | Steam power plant's heat supply steam superheating degree of heating boiler overgrate air utilizes system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105444152A (en) * | 2015-12-23 | 2016-03-30 | 广州粤能电力科技开发有限公司 | Thermal power plant heating steam superheat utilizing system for heating secondary air of boiler |
| CN106524127A (en) * | 2016-11-27 | 2017-03-22 | 冯伟忠 | Steam cooler system and method for decreasing steam-extraction superheat degree of steam cooler system |
| CN113713599A (en) * | 2021-09-10 | 2021-11-30 | 国能神东煤炭集团有限责任公司 | Circulating fluidized bed semi-dry method low-load desulfurization system and control method |
| CN115289458A (en) * | 2022-08-03 | 2022-11-04 | 华能国际电力股份有限公司 | Air supply auxiliary heating system in starting process of coal-fired power plant and operation method |
-
2015
- 2015-12-23 CN CN201521100152.5U patent/CN205261526U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105444152A (en) * | 2015-12-23 | 2016-03-30 | 广州粤能电力科技开发有限公司 | Thermal power plant heating steam superheat utilizing system for heating secondary air of boiler |
| CN105444152B (en) * | 2015-12-23 | 2018-08-10 | 广州粤能电力科技开发有限公司 | Steam power plant's heating steam degree of superheat of heating boiler Secondary Air utilizes system |
| CN106524127A (en) * | 2016-11-27 | 2017-03-22 | 冯伟忠 | Steam cooler system and method for decreasing steam-extraction superheat degree of steam cooler system |
| CN113713599A (en) * | 2021-09-10 | 2021-11-30 | 国能神东煤炭集团有限责任公司 | Circulating fluidized bed semi-dry method low-load desulfurization system and control method |
| CN113713599B (en) * | 2021-09-10 | 2023-05-12 | 国能神东煤炭集团有限责任公司 | Semi-dry low-load desulfurization system of circulating fluidized bed and control method |
| CN115289458A (en) * | 2022-08-03 | 2022-11-04 | 华能国际电力股份有限公司 | Air supply auxiliary heating system in starting process of coal-fired power plant and operation method |
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