CN102337933A - Cooling system of thermal power plant - Google Patents
Cooling system of thermal power plant Download PDFInfo
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- CN102337933A CN102337933A CN201110236286XA CN201110236286A CN102337933A CN 102337933 A CN102337933 A CN 102337933A CN 201110236286X A CN201110236286X A CN 201110236286XA CN 201110236286 A CN201110236286 A CN 201110236286A CN 102337933 A CN102337933 A CN 102337933A
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Abstract
The invention discloses a cooling system in a thermal power plant, and the system comprises a direct air cooling heat radiation system and a wet condenser, wherein the direct air cooling heat radiation system comprises an air cooling tube bundle and an air cooling fan, is connected with an exhaust steam pipe of a steam turbine of a thermal power plant through an air cooling steam collector, and cools the steam discharged by the exhaust steam pipe of the steam turbine in the thermal power plant through the air cooling fan; the wet condenser is connected with the exhaust steam pipe of the steam turbine in the thermal power plant through a steam pipeline, and is used for cooling the exhaust steam flowing to the steam turbine of the wet condenser; and the steam pipeline is provided with an electric butterfly valve which is used for controlling the flow rate of the exhaust steam of the steam turbine flowing to the wet condenser.
Description
Technical field
The present invention particularly about the cooling system of thermoelectricity plant's generator set, is a kind of thermoelectricity plant cooling system about thermoelectricity plant's cooling technology concretely.
Background technique
At present, the generator set of the domestic many thermoelectricity plants of China adopts direct air cooling system, and direct air cooling system has characteristics such as back pressure height, power consumption are big, high efficiency, cost relatively economical with respect to indirect air cooling system.
But when summer, because ambient temperature is high, the air cooling condenser heat exchanging function of direct air cooling system is not strong, causes the steam turbine exhaust pressure of air cooling system high.And descend year by year along with climate warming and domestic coal price continue design back pressure value high and existing Direct Air-cooled Unit, the Economy of unit is variation also.2 * 300MW unit air cooling system with Shanxi power plant is an example, this unit design back pressure 15KPa, and summer, full carbuncle on the back was pressed 32KPa; Since the operation; The summer operation back pressure increases year by year, and summer in 2009, full carbuncle on the back was pressed up to 42KPa, and coal consumption also increases year by year; Net coal consumption rate reaches 370g/kw.h, is higher than the whole province's net coal consumption rate far away.
Because the unit operation back pressure is higher, the increase of steam turbine consumption of steam causes boiler load to increase, and also makes each subsidiary engine operating load of boiler increase, and each relevant device all is in and exceeds the power running state, makes the unit operation Security descend the Economy variation.
Summary of the invention
The embodiment of the invention provides a kind of thermoelectricity plant cooling system, and this system comprises: direct air cooling radiation system and clammy vapour condenser: wherein,
Described direct air cooling radiation system; Comprise air cooling cooling tube bundle and air cooling blower fan; Described direct air cooling radiation system is connected with the turbine discharge pipe of thermoelectricity plant through air cooling steam collector, the steam of discharging through the turbine discharge pipe of described cooling blower heat of cooling power plant;
Described clammy vapour condenser is connected with the outlet pipe of said steam turbine in thermal power plant through steam line; Be used for the turbine discharge of cool stream to said clammy vapour condenser; Described steam line is provided with electric butterfly valve, and the steam discharge that is used to control described steam turbine flows to the flow of described clammy vapour condenser.
For let above-mentioned and other purposes of the present invention, feature and advantage can be more obviously understandable, hereinafter is special lifts preferred embodiment, and cooperates appended graphicly, elaborates as follows.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technological scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is a structured flowchart of the present invention;
Fig. 2 is the annexation figure of vapour condenser and vent systems in the embodiment of the invention;
Fig. 3 is the structural drawing of cooling system disclosed by the invention.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technological scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiments.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment who is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
The invention discloses a kind of thermoelectricity plant cooling system, as shown in Figure 1, cooling system of the present invention is used for the turbine discharge of thermoelectricity plant is cooled off; Comprise direct air cooling radiation system 102; Be made up of air cooling cooling tube bundle, cooling blower, the steam that steam turbine in thermal power plant is discharged stimulated the menstrual flow to restrain and was cooled off clammy vapour condenser 103 by air cooling blower fan; Clammy vapour condenser 103 in the thermoelectricity plant of the present invention cooling system is connected with the outlet pipe of steam turbine in thermal power plant through steam line; Be used for the turbine discharge of cool stream to clammy vapour condenser 103, steam line is provided with electric butterfly valve, and the steam discharge that is used to control steam turbine flows to the flow of described clammy vapour condenser 103.
Thermoelectricity plant of the present invention cooling system also comprises circulating water cooling system, is used to clammy vapour condenser recirculated cooling water is provided, and steam turbine in thermal power plant is drained into the steam of vapour condenser, through circulating water cooling system the exhaust in the vapour condenser is cooled off; Condensate water tank is used to collect the water of condensation that air cooling heat radiator and clammy vapour condenser cooling steam are generated; Condensate pump is used for the water of condensation that clammy vapour condenser cooling steam generates is delivered to condensate water tank through this condensate pump; Pumped vacuum systems, the true system of finding time of access direct air cooling radiation system 102 comprises vacuum pump and related system pipeline, through vacuum pump incondensable gas in the clammy vapour condenser and leaked-in air is extracted out; Ball cleaning apparatus is used for the cooling tube bundle of vapour condenser is cleaned.
Below in conjunction with specific embodiment the present invention is explained further details.
Certain thermoelectricity plant has 2 * 300MW unit; In the existing technology; Two units are all adopted direct air cooling system, and under the summer high temperature situation, the unit operation back pressure is higher than former design load (32 ℃ of ambient temperatures far away; The unit back pressure is 34Kpa under the full load situation, and discontented when ambient temperature is higher than 32 ℃ sent out and hour be about 100h.Typical condition as, at about 33.8 ℃ of ambient temperatures, No. 1 unit load 289MW, back pressure 48Kpa; No. 2 unit load 290MW, back pressure 49.1Kpa.Because the unit operation back pressure is higher, the increase of steam turbine consumption of steam causes boiler load to increase, and also makes each subsidiary engine operating load of boiler increase, and each relevant device all is in and exceeds the power running state, and the unit operation Security descends.
Adopt technological scheme of the present invention that two above-mentioned units are improved; For No. 1 unit; As shown in Figure 2; On the big blow-off line of the original A of being parallel to row, pick out a DN4000 pipeline 202 (at the fixed end of steam turbine building), vertical lifting is to+11.56m then, receives downwards+clammy vapour condenser 201 inlets of 6.812m again.On pipeline 202, be provided with axially-lateral expansion joint and hinge type expansion joint, with extraction duct laterally with displacement such as axially.On pipeline 202, be provided with electric butterfly valve 203, when summer, the unit operation back pressure was high, opens valve a part of vapor stream to clammy vapour condenser is cooled off, alleviate the pressure of direct air cooling radiation system, reach the purpose that reduces back pressure.When spring, autumn, winter, the unit operation back pressure was low, throttle down made whole steam discharges through the cooling of direct air cooling radiation system.
For No. 2 units; Still adopt direct air cooling radiation system of the prior art; The pipeline that transform DN4000 as with the original A of being parallel to row near the blow-off line of extending the DN2800 that holds; Then air cooling to AK row and AL row intermediate vertical rise to+13.06m, the level pipeline of telling DN4000 connects vapour condenser again, the pipeline reducing diameter of vertical lifting is that DN2800 still connects original air cooling heat radiator.On the same improved pipeline expansion joint and electric butterfly valve are set.
Such scheme is that the existing direct air cooling radiation system of certain thermoelectricity plant improves, and increases clammy vapour condenser, when summer, the unit operation back pressure was high, opens valve a part of vapor stream to clammy vapour condenser is cooled off, and alleviates the pressure of direct air cooling radiation system.
As shown in Figure 3, the cooling system of thermoelectricity plant removes and comprises the clammy vapour condenser 302 of transforming the back increase in the present embodiment, also further comprises: pumped vacuum systems 303, circulation 305, rubber ball cleaning system 304 and condensate water tank 306.Through exhauster system 301 steam is introduced clammy vapour condenser 302 in the present embodiment; Come the turbine discharge of heat of cooling power plant through circulating water; Incondensable gas in the pumped vacuum systems 303 extraction vapour condenser, rubber ball cleaning system 304 carries out regular glueballs cleaning for clammy vapour condenser 302 coagulates but tube bank.
Circulation 305: for vapour condenser provides cooling water, reduce the turbine discharge back pressure, improve the heat economy benefit.In the embodiment of the invention, circulation adopts the piping-main scheme water system, i.e. one group of four lattice mechanical draft of two machine assembly tower, two circulating water pump, a DN2020 water pipe, a DN2020 return pipe, pipe flow speed 3.34m/s.Supply water pipeline that female pipe meets two-way Φ 1020 to vapour condenser from recirculated cooling water, and the water return pipeline of two Φ 1020 is connected to the female pipe of cooling water return of circulation respectively behind the cooling steam.
Exhauster system 301: the pipeline that part steam is caused vapour condenser from main frame exhauster system 301.The steam line that picks out DN4000 from the exhaust steam pipe of the big blow-off line DN5000 of steam turbine main frame in the embodiment of the invention is to vapour condenser; On establish electric butterfly valve; When summer, the unit operation back pressure was high; Open valve and make in the clammy vapour condenser in a part of vapor stream to the chiller system and cool off, alleviate the pressure of direct air cooling radiator, reach the purpose that reduces back pressure.When spring, autumn, winter, the unit operation back pressure was low, throttle down made whole steam discharges through the cooling of direct air cooling radiator.
Pumped vacuum systems 303: keep vapour condenser vapour side and remain certain degree of vacuum, the incondensable gas that gets into vapour condenser collects in noncondensing district, is connected to pumped vacuum systems 303 through pipeline again.
Condensate system 306: be with the water of condensation after the steam cooling in clammy vapour condenser 302, be delivered to condensate water tank 306 through pipeline.Drainage pump by two 100% capacity of every machine configuration set is delivered to the condensate water tank 306 that the A row adjoin room 12.6m layer with the water of condensation of cooling, gets into the main frame condensate system.
Vapour condenser 302 is provided with rubber ball cleaning system 304 in the embodiment of the invention, and the device that regularly the vapour condenser cooling tube bundle is cleaned stops up to prevent tube bank.
The present invention combines direct air cooling with clammy vapour condenser, summer, direct air cooling and clammy vapour condenser all dropped into, and only dropped into the direct air cooling device winter, and its two be coordination.Direct air cooling is for to cool off turbine discharge through axial-flow blower, and clammy vapour condenser is to cool off another turbine discharge through circulating water, thereby reaches cooling effect.
2 * 300MW unit of above-mentioned certain power plant; When two units all adopted the direct air cooling radiator, summer, full carbuncle on the back was pressed: and 34KPa (the former design data of unit, actual motion is higher than this value far away; On average at 38～40Kpa, consider that uncertain factor calculates according to 37Kpa).
And adopt the disclosed cooling system of the embodiment of the invention, summer, full carbuncle on the back was pressed: 22KPa (SPX has adjusted the back and has been 20KPa, but considers after moving 5 years that direct-cooling radiator has certain dirt to get 22KPa temporarily).
The summer operation time period: (May altogether) by the end of April～by the end of September.
Working time every day section: 24 hours the operation.
Coal consumption is poor: the every reduction of back pressure 1KPa, and coal consumption reduces 1.1g/KWh, and (show that according to the energy-saving analysis calculating in every month of this power plant unit 100% is loaded, back pressure is at 40～45Kpa, and every 1Kpa back pressure influences coal consumption on average at 1.5g/KWh; Back pressure is at 30～40Kpa, and every 1Kpa back pressure influences coal consumption on average at 2.0g/KWh; Unit 80% load, every 1Kpa back pressure influences coal consumption on average at 2.0g/KWh; Consider that calculating uncertain reason takes all factors into consideration, every 1Kpa back pressure influences coal consumption and on average calculates according to 1.1g/KWh).
Mark coal price: 680 yuan/ton (went into factory's coal mark coal unit price in 1～November in 2010 on average at 665 yuan/ton, on average be higher than 690 yuan/ton December, the uncertain factor of therefore considering the coal market variation is temporarily according to 680 yuan of/ton calculating).
Air cooling system spray cooling expense: in the summer high temperature high temperature period in season; (water price is by the 0.4 yuan/capable spray desuperheating of demineralized water t) made will to adopt municipal middle water; Its expense is estimated as 20 yuan/t (considering former water rate, cost of labour, plant maintenance expense, depreciation of equipment etc.); Per hour consume demineralized water 100t/h, 5 hour calculate according to putting into operation every day, and 5 months air cooling spray coolings of two units expense is 1,500,000 yuan.
Through calculating; Adopt two units of technological scheme disclosed by the invention and available technology adopting all to adopt the cooling system of direct air cooling to compare; If do not consider that depreciation every year can be less with 35640 tons of standard coals; 2423.5 ten thousand yuan of fuel saving costs, and use demineralized water 75000t less, save 1,500,000 yuan of demineralized water costs.
The present invention combines direct air cooling system with clammy vapour condenser, only drop into the direct air cooling device winter, and when summer, back pressure was high, direct air cooling and clammy condenser system all dropped into, and reaches the purpose, the reduction boiler load that reduce back pressure, improves the unit operation Security.
Used specific embodiment among the present invention principle of the present invention and mode of execution are set forth, above embodiment's explanation just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that on embodiment and application area, all can change, in sum, this description should not be construed as limitation of the present invention.
Claims (6)
1. thermoelectricity plant's cooling system is characterized in that, described system comprises: direct air cooling radiation system and clammy vapour condenser: wherein,
Described direct air cooling radiation system; Comprise air cooling cooling tube bundle and air cooling blower fan; Described direct air cooling radiation system is connected with the turbine discharge pipe of thermoelectricity plant through air cooling steam collector, the steam of discharging through the turbine discharge pipe of described cooling blower heat of cooling power plant;
Described clammy vapour condenser is connected with the outlet pipe of said steam turbine in thermal power plant through steam line; Be used for the turbine discharge of cool stream to said clammy vapour condenser; Described steam line is provided with electric butterfly valve, and the steam discharge that is used to control described steam turbine flows to the flow of described clammy vapour condenser.
2. thermoelectricity plant as claimed in claim 1 cooling system is characterized in that, described thermoelectricity plant cooling system also comprises:
Circulating water cooling system connects circulating water pipeline to described vapour condenser on the female pipe of recirculated cooling water water supply of described circulating water cooling system, be used to said clammy vapour condenser recirculated cooling water is provided.
3. thermoelectricity plant as claimed in claim 1 cooling system is characterized in that, described thermoelectricity plant cooling system also comprises:
Condensate water tank is used to collect the water of condensation that described air cooling heat radiator and described clammy vapour condenser cooling steam are condensed into.
4. thermoelectricity plant as claimed in claim 1 cooling system is characterized in that, described thermoelectricity plant cooling system also comprises:
Condensate pump is used for the condensate pump that described clammy vapour condenser cooling steam generates is delivered to described condensate water tank.
5. thermoelectricity plant as claimed in claim 1 cooling system is characterized in that, described thermoelectricity plant cooling system also comprises:
Pumped vacuum systems inserts the pumped vacuum systems of described direct air cooling radiation system, is used for incondensable gas in the said clammy vapour condenser and leaked-in air are extracted out.
6. thermoelectricity plant as claimed in claim 1 cooling system is characterized in that, described thermoelectricity plant cooling system also comprises:
Ball cleaning apparatus is used for the cooling tube bundle of clammy vapour condenser is cleaned.
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| CN201110236286XA CN102337933A (en) | 2011-08-17 | 2011-08-17 | Cooling system of thermal power plant |
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| CN201110236286XA CN102337933A (en) | 2011-08-17 | 2011-08-17 | Cooling system of thermal power plant |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105674760A (en) * | 2016-03-22 | 2016-06-15 | 西安热工研究院有限公司 | Joint air-cooling system and control method |
| CN105715314A (en) * | 2016-04-17 | 2016-06-29 | 昆山克鲁克机电设备有限公司 | Quick cooling device for steam turbine |
| CN108050859A (en) * | 2017-12-29 | 2018-05-18 | 国电科学技术研究院有限公司 | A kind of fired power generating unit direct air cooling system |
| CN113339086A (en) * | 2021-07-08 | 2021-09-03 | 山东大学 | Air cooling and humidifying device and method and wet air turbine circulating system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105674760A (en) * | 2016-03-22 | 2016-06-15 | 西安热工研究院有限公司 | Joint air-cooling system and control method |
| CN105715314A (en) * | 2016-04-17 | 2016-06-29 | 昆山克鲁克机电设备有限公司 | Quick cooling device for steam turbine |
| CN108050859A (en) * | 2017-12-29 | 2018-05-18 | 国电科学技术研究院有限公司 | A kind of fired power generating unit direct air cooling system |
| CN113339086A (en) * | 2021-07-08 | 2021-09-03 | 山东大学 | Air cooling and humidifying device and method and wet air turbine circulating system |
| CN113339086B (en) * | 2021-07-08 | 2022-05-31 | 山东大学 | Air cooling and humidifying device and method and wet air turbine circulating system |
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