CN201714431U - Regenerative steam-driven condensate pump system of power plant - Google Patents

Regenerative steam-driven condensate pump system of power plant Download PDF

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Publication number
CN201714431U
CN201714431U CN201020181791XU CN201020181791U CN201714431U CN 201714431 U CN201714431 U CN 201714431U CN 201020181791X U CN201020181791X U CN 201020181791XU CN 201020181791 U CN201020181791 U CN 201020181791U CN 201714431 U CN201714431 U CN 201714431U
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China
Prior art keywords
steam
unit
small turbine
condensate pump
turbine
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CN201020181791XU
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Chinese (zh)
Inventor
申松林
林磊
叶勇健
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China Power Engineering Consulting Group East China Electric Power Design Institute Co Ltd
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China Power Engineering Consulting Group East China Electric Power Design Institute Co Ltd
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Abstract

The utility model discloses a regenerative steam-driven condensate pump system of a power plant, comprising a small steam turbine unit and a condensate pump, wherein the small steam turbine unit consists of a small steam turbine, a steam inlet pipe system of the small steam turbine and a steam discharge pipe system of the small steam turbine; the condensate pump is driven by the small steam turbine. The utility model adopts the small steam turbine to drive the condensate pump, the steam of the small steam turbine is discharged into regenerative equipment, therefore, the steam discharge heat is recovered in a thermal circulating system of the power plant. The utility model has the advantages that the small steam turbine can be driven to rotate by the steam with various steam sources, then the small steam turbine drives the condensate pump, the steam can be discharged into various regenerative equipment, the worked steam in the steam turbine can be utilized to heat the feed water or the condensed water, the cold source loss of the steam heat is reduced, the heat is transferred to the feed water or the condensed water, and the thermal circulating efficiency is improved. The utility model replaces a motor in the power plant, so the electricity utilization of the plant can be reduced, and the power supply benefit of the unit is improved.

Description

Power station regenerative heat type steam-operating condensate pump system
Technical field
The utility model relates to power plant system, particularly a kind of power station regenerative heat type steam-operating condensate pump system.
Background technique
At present the power supply demand of China is growing, and electric motor power is fast rise year by year thereupon also, significantly improving unit parameter with when improving generating efficiency, how to improve power consumption efficiency, promptly reduces station service power consumption rate and more and more is much accounted of.
The mode that significantly reduces at present station service power consumption rate mainly is the main equipment with the power station, is typically the boiler condensate pump, is changed into by small turbine by motoring driving, and can cancel jumbo motor like this, to reach the purpose that significantly reduces station service.
Prior art employing small turbine driving condensate pump system (hereinafter to be referred as: prior art) as shown in Figures 1 and 2, wherein the small turbine steam discharge of Fig. 1 enters the main frame vapour condenser, circulating water condensation by the main frame vapour condenser is a water of condensation, and the small turbine steam discharge of Fig. 2 enters the independent vapour condenser of small turbine, is water of condensation by the circulating water condensation of small turbine vapour condenser.But no matter be Fig. 1 or system shown in Figure 2, small turbine all is a condensed steam type, all be steam discharge to be condensed into water of condensation by circulating water (low-temperature receiver), so only can reclaim the working medium of steam discharge, but the heat of steam discharge (it is over half that this heat accounts for the heat of vapour source steam) will be drained along with circulating water, thereby make whole circulation efficient not high.
And, drive in the condensate pump technology at above-mentioned traditional condensed steam type small turbine, because the efficient of small turbine is more much lower than main steam turbine, thereby after causing condensate pump changed into small turbine and driven by motor, only can play the purpose that reduces station service, the power supply efficiency of whole generating factory is to have reduced on the contrary.
Therefore, related domain presses for a kind of employing small turbine and drives condensate pump, both can reach the purpose that reduces station service, and the while can be recovered to exhaust steam heat in the thermodynamic cycle, thereby has significantly improved the system of unit power supply efficiency.
The model utility content
First purpose of the present utility model is to provide a kind of employing small turbine to drive condensate pump, both can reduce the purpose of station service, while can be recovered to exhaust steam heat in the thermodynamic cycle again, thereby has significantly improved the power station regenerative heat type steam-operating condensate pump system of unit power supply efficiency.
Second purpose of the present utility model is to provide a kind of employing small turbine to drive condensate pump, both can reduce the purpose of station service, while can be recovered to exhaust steam heat in the thermodynamic cycle again, thereby has significantly improved the power station circulation system of unit power supply efficiency.
First aspect of the present utility model provides a kind of power station regenerative heat type steam-operating condensate pump system (100), adopt small turbine (11) to drive by condensate pump (2), simultaneously with the heat? recovery of small turbine (11) steam discharge to power station circulation system (300), it comprises:
-regenerative heat type small turbine unit (1); Described regenerative heat type small turbine unit (1) comprising:
-small turbine (11);
-be located at the small turbine admission piping (12) of described small turbine (11) upstream, wherein, described small turbine admission piping (12) is accepted the steam source (34) from power station circulation system (300); And
-be located at the small turbine exhaust steam pipeline (13) in described small turbine (11) downstream; The steam discharge of described small turbine exhaust steam pipeline (13) enters the backheat unit (32) of described power station circulation system (300);
-and by the condensate pump (2) of described small turbine unit (1) driving.
In a preference, described condensate pump is the boiler condensate pump.
In an embodiment of the present utility model, described driven equipment (2) is selected from by boiler condensate pump and desulfurization booster fan and merges the condensate pump that forms.
Second aspect of the present utility model provides a kind of power station circulation system (300), it comprises the circulation that boiler unit (33), main steam turbine unit (30), vapour condenser unit (31) and backheat unit (32) are constituted, wherein said main steam turbine unit (30) and/or described boiler unit (33) provide steam source (34), it is characterized in that, also comprise:
-as regenerative heat type steam-operating condensate pump system described in the utility model (100), wherein said steam source (34) provides driving steam for small turbine (11);
-backheat unit (32), the steam discharge of wherein said power station regenerative heat type small turbine system (100) enters described backheat unit (32); And the heat? recovery of described backheat unit (32) is to described boiler unit (33).
In an embodiment of the present utility model, described main steam turbine unit (30) is made up of high-pressure cylinder (301), intermediate pressure cylinder (302), low pressure (LP) cylinder (303) in regular turn;
Wherein,
The admission of described high-pressure cylinder (301) is main steam (341); Steam discharge is hot cold section steam (342) again;
The admission of described intermediate pressure cylinder (302) is hot arc steam (343) again; Steam discharge is intermediate pressure cylinder steam discharge (344).
In an embodiment of the present utility model, the steam source (34) that enters described power station regenerative heat type small turbine system (100) is selected from one or more in the following vapour source:
Main steam (341); Hot colder section steam (342), hot arc steam (343), intermediate pressure cylinder steam discharge (344), main steam turbine draw gas again, the intermediate steam of boiler unit, auxiliary steam, other have the steam of the degree of superheat.
In an embodiment, described main steam turbine draws gas and is meant, certain level of the high, medium and low cylinder pressure of main steam turbine is drawn gas.
In an embodiment, the intermediate steam of described boiler unit is meant: the intermediate steam of boiler superheater or reheater.
Advantage of the present utility model is:
The utility model provides a kind of power station regenerative heat type steam-operating condensate pump system, can utilize steam heating feedwater or the water of condensation of making merit in the steam turbine, reduce the cold source energy of steam heat, this heat is passed to feedwater or water of condensation, thereby improve efficiency of thermal cycle.
Can be as required, the steam source of the small turbine of power station regenerative heat type small turbine system and steam discharge backheat unit are selected flexibly and reached necessary requirement.
Description of drawings
Fig. 1 is that the auxiliary small turbine of the condensing power station of prior art drives the condensate pump system, and small turbine steam discharge wherein enters the main frame vapour condenser;
Fig. 2 is that the auxiliary small turbine of the condensing power station of prior art drives the condensate pump system, and small turbine steam discharge wherein enters independent vapour condenser;
Fig. 3 is regenerative heat type steam-operating condensate pump system of condensing power station of the present utility model (100) and the heat regenerative system (200) that is used for described small turbine (11) and the power station circulation system (300) that contains said system.
Embodiment
The utility model designer is through extensive and deep research, by changing technological process, problem at the prior art existence, the invention provides a kind of power station regenerative heat type steam-operating condensate pump system, this system is the part of power station circulation system, wherein steam source is after the running of small turbine acting driving arrangement, and the heat of steam discharge and working medium are recovered in the power station circulation system by backheat equipment.Power station of the present invention regenerative heat type small turbine system has the steam discharge of minimizing cold source energy, improves the effect of unit efficiency.Finished the utility model on this basis.
Herein, described " power station " comprising: industry power plants for self-supply such as thermal power plant, nuclear power plant, biomass power generation factory, gas turbine power plant, steel chemical papermaking, but be not limited to this.Comprise that also other needs small turbine to drive the system of condensate pump.
Herein, described " backheat " is meant and utilizes steam heating feedwater or the water of condensation of making merit in the steam turbine, reduce the cold source energy of steam heat, this heat passed to feedwater or water of condensation, thereby improve efficiency of thermal cycle.
Other aspects of the present utility model are because the disclosure of this paper is conspicuous to those skilled in the art.
Steam source
In the power station circulation system, can produce steam source in many places.Usually, the power station circulation system comprises the circulation that boiler unit, main steam turbine unit, vapour condenser unit and backheat unit are constituted, wherein said main steam turbine unit, described boiler unit form steam source, and perhaps two unit form steam source simultaneously.
Steam source of the present utility model can be one or more in the following vapour source:
1) main steam (being the high-pressure cylinder admission of main steam turbine);
2) hot colder section steam (being the high-pressure cylinder steam discharge of main steam turbine);
3) hot arc steam (being the intermediate pressure cylinder admission of main steam turbine) again;
4) the intermediate pressure cylinder steam discharge of main steam turbine;
5) the high, medium and low cylinder pressure level of main steam turbine is drawn gas;
6) intermediate steam of boiler superheater or reheater;
7) auxiliary steam;
8) other have the steam of certain degree of superheat.
Described steam source can adopt above a kind of vapour source, also can merge.Preferably, adopt 1) hot colder section steam (being the high-pressure cylinder steam discharge of main steam turbine); 2) auxiliary steam; 3) intermediate steam of boiler superheater or reheater; A kind of or combination among the three.
Described steam source is running like this: by small turbine admission piping steam is connected to small turbine; Steam does work in small turbine, drives the driven equipment running by small turbine; Steam discharge after the acting enters steam discharge backheat unit by the small turbine exhaust steam pipeline, and the heat of steam discharge and working medium are recovered in the thermodynamic cycle.
Regenerative heat type small turbine unit and be driven condensate pump
Described regenerative heat type small turbine unit comprises: small turbine; Be located at the small turbine admission piping of described small turbine upstream, wherein, described small turbine admission piping is accepted the steam source from the power station circulation system; And the small turbine exhaust steam pipeline that is located at described small turbine downstream; The steam discharge of described small turbine exhaust steam pipeline enters the backheat unit of described power station circulation system.
In the regenerative heat type small turbine unit, the small turbine of employing does not have specific (special) requirements, only otherwise goal of the invention of the present utility model is produced restriction to get final product.Described " small turbine " is the conventional term of related domain, is generally for main steam turbine.Usually, the power station main steam turbine is used to drive generator for electricity generation, and small turbine is used to drive the subsidiary engine equipment operation.Those skilled in the art are according to normal condition, or select small turbine according to the condition that manufacturer advises.
The condensate pump that is driven by small turbine can be the boiler condensate pump, also can be the condensate pump that boiler condensate pump and desulfurization booster fan merge.
In the regenerative heat type small turbine unit, steam discharge backheat unit can be one or more in the following equipment in the regenerative heat type small turbine unit:
1) deaerating heater;
2) low-pressure heater;
3) high-pressure heater;
4) other backheat equipment.
It is running like this that backheat small turbine of the present utility model drives the condensate pump system: the key point of regenerative heat type small turbine system of the present invention is that small turbine adopts the backheat principle, after the steam process small turbine work done of steam source, the steam discharge of small turbine is guided to heating heating power circuit working medium (as: feedwater or water of condensation) in the steam discharge backheat unit, power station (as: deaerating heater or high and low pressure heater), to reclaim heat and working medium, improve cycle efficiency greatly.The small turbine of using with the driving condensate pump of prior art adopts the condensed steam type system, enters vapour condenser, only reclaims working medium and does not reclaim the heat difference.
Below in conjunction with specific embodiment, further illustrate the utility model.Should be understood that these embodiments only to be used to the utility model is described and be not used in the restriction scope of the present utility model.Canonical system described in this specification is a kind of preferable specific embodiment of the present invention.All technician in the art all should be in claim protection domain of the present invention under this invention's idea on the basis of existing technology by the available technological scheme of logical analysis, reasoning, or a limited experiment.
Unless otherwise defined or explanation, the meaning that all specialties used herein are familiar with scientific words and those skilled in the art is identical.Any in addition equipment similar or impartial to described content all can be applicable in the utility model.
Embodiment
As shown in Figure 3, show an embodiment of power station of the present utility model regenerative heat type small turbine system.Only connected typical vapour source and backheat equipment among the figure, and not shown all possibilities, so Fig. 3 only is not to restriction of the present utility model with explaining.
Fig. 3 shows a kind of power station of the present utility model regenerative heat type steam-operating condensate pump system 100, is used for heat? recovery with small turbine 11 steam discharges to power station circulation system 300, and it comprises: regenerative heat type small turbine unit 1; Described regenerative heat type small turbine unit 1 comprises: small turbine 11; Be located at the small turbine admission piping 12 of described small turbine 11 upstreams, wherein, the steam source 34 that described small turbine admission piping 12 is accepted from power station circulation system 300; And the small turbine exhaust steam pipeline 13 that is located at described small turbine 11 downstreams; The steam discharge of described small turbine exhaust steam pipeline 13 enters the backheat unit 32 of described power station circulation system 300; With by the steam-powered condensate pump 2 of described small turbine 1.
Wherein, the described condensate pump 2 that is driven can be the boiler condensate pump, also can be the condensate pump that boiler condensate pump and desulfurization booster fan merge.
Fig. 3 also shows the heat regenerative system 200 that is used for described small turbine 11, and small turbine 11 steam discharges are entered backheat unit 32, with the heat? recovery of steam discharge in power station circulation system 300.
Described backheat unit 32 is selected from one or more in the following equipment: deaerating heater 322, low-pressure heater 321, high-pressure heater 323 or other backheat equipment.
Fig. 3 also shows a kind of power station circulation system 300, it comprises the circulation that boiler unit 33, main steam turbine unit 30, vapour condenser unit 31 and backheat unit 32 are constituted, the steam source 34 that wherein said main steam turbine unit 30 and/or described boiler unit 33 provide, also comprise power station regenerative heat type steam-operating condensate pump system 100, the steam of wherein said steam source 34 inserts described power station regenerative heat type steam-operating condensate pump system 100; And steam discharge backheat unit 32, and the heat? recovery of described backheat unit 32 is to described boiler unit 33.
Described main steam turbine unit 30 is made up of high-pressure cylinder 301, intermediate pressure cylinder 302, low pressure (LP) cylinder 303 in regular turn; The admission of described high-pressure cylinder 301 is a main steam 341; Steam discharge is hot cold section steam 342 again; The admission of described intermediate pressure cylinder 302 is hot arc steam 343 again; Steam discharge is an intermediate pressure cylinder steam discharge 344.
The steam source 34 that inserts the auxiliary steam-operating condensate pump system 100 in described power station is selected from one or more in the following vapour source: main steam 341; Hot colder section steam 342, hot arc steam 343, intermediate pressure cylinder steam discharge 344, main steam turbine draw gas again, the intermediate steam (intermediate steam of boiler superheater or reheater) of boiler unit, auxiliary steam, other have the steam of the degree of superheat.
Described steam discharge backheat unit 32 is selected from one or more in the following equipment: deaerating heater 322, low-pressure heater 321, high-pressure heater 323 or other backheat equipment.
System of the present utility model is running like this:
Form the vapor recycle pipeline by boiler unit 33, main steam turbine unit 30, power station regenerative heat type steam-operating condensate pump system 100 and backheat unit 32;
Wherein: described main steam turbine unit 30 and/or boiler unit 33 carry out steam discharge and form steam source 34, and the steam of described steam source 34 inserts described power station regenerative heat type steam-operating condensate pump system 100; The steam discharge of wherein said power station regenerative heat type steam-operating condensate pump system 100 enters described backheat unit 32; And the heat? recovery of described backheat unit 32 is to described boiler unit 33.
Adopting as above, step reaches the purpose that reclaims small turbine exhaust steam heat and working medium.
The utility model has reached following effect:
One, regenerative heat type steam-operating condensate pump system drive the condensate pump system with existing condensed steam type small turbine and compare, and cycle efficiency improves greatly.With a coal-fired thermal power generation unit of typical 1000MW is example, change the regenerative heat type small turbine system as the small turbine that will drive condensate pump into by condensed steam type, move estimation in 5500 hours per year, can save coal-fired about 3000 tons every year, by coal-fired 600 yuan of calculating per ton, the benefit of then economizing on coal is 1,800,000/year.
Two, regenerative heat type steam-operating condensate pump system compares with the motoring condensate pump system of routine, and station service power consumption rate descends greatly.With a coal-fired thermal power generation unit of typical 1000MW is example, change the regenerative heat type small turbine system as driving mode into by motor with condensate pump, then station service power consumption rate descends about 0.6%, move estimation in 5500 hours per year, can save coal-fired about 6000 tons every year, by coal-fired 600 yuan of calculating per ton, the benefit of then economizing on coal is 3,600,000/year.
Three, after the employing regenerative heat type steam-operating condensate pump system, under the prerequisite of guaranteed efficiency, the driving device of condensate pump is limited by voltage no longer.As the common 6kV electric pressure in power station, be subjected to the restriction of inrush current, also need increase as power, then need adopt the electric pressure of 10kV, this will increase the complexity of construction investment and system greatly.Regenerative heat type steam-operating condensate pump system does not then have the restriction of this respect.
In a word, from above-mentioned multi-angle, the present invention compared with prior art has remarkable economic efficiency and huge potential social effect, especially meets the current needs of creating conservation-minded society.
All quote in this application as a reference at all documents that the utility model is mentioned, just quoted as a reference separately as each piece document.Should be understood that in addition after having read foregoing of the present utility model, those skilled in the art can make various changes or modifications the utility model, these equivalent form of values fall within the application's appended claims institute restricted portion equally.

Claims (5)

1. a power station regenerative heat type steam-operating condensate pump system (100) adopts small turbine (11) to drive by condensate pump (2), simultaneously with the heat? recovery of small turbine (11) steam discharge to power station circulation system (300), it is characterized in that it comprises:
-regenerative heat type small turbine unit (1); Described regenerative heat type small turbine unit (1) comprising:
-small turbine (11);
-be located at the small turbine admission piping (12) of described small turbine (11) upstream, wherein, described small turbine admission piping (12) is accepted the steam source (34) from power station circulation system (300); And
-be located at the small turbine exhaust steam pipeline (13) in described small turbine (11) downstream; The steam discharge of described small turbine exhaust steam pipeline (13) enters the backheat unit (32) of described power station circulation system (300);
-and by the condensate pump (2) of described small turbine unit (1) driving.
2. the system as claimed in claim 1 is characterized in that, described condensate pump (2) is selected from by boiler condensate pump and desulfurization booster fan and merges the condensate pump that forms.
3. a power station circulation system (300), it comprises the circulation that boiler unit (33), main steam turbine unit (30), vapour condenser unit (31) and backheat unit (32) are constituted, wherein said main steam turbine unit (30) and/or described boiler unit (33) provide steam source (34), it is characterized in that, also comprise:
-regenerative heat type steam-operating condensate pump system as claimed in claim 1 (100), wherein said steam source (34) provides driving steam for small turbine (11);
-backheat unit (32), the steam discharge of wherein said power station regenerative heat type small turbine system (100) enters described backheat unit (32); And the heat? recovery of described backheat unit (32) is to described boiler unit (33).
4. system as claimed in claim 3 is characterized in that, described main steam turbine unit (30) is made up of high-pressure cylinder (301), intermediate pressure cylinder (302), low pressure (LP) cylinder (303) in regular turn;
Wherein,
The admission of described high-pressure cylinder (301) is main steam (341); Steam discharge is hot cold section steam (342) again;
The admission of described intermediate pressure cylinder (302) is hot arc steam (343) again; Steam discharge is intermediate pressure cylinder steam discharge (344).
5. system as claimed in claim 3 is characterized in that, the steam source (34) that enters described power station regenerative heat type small turbine system (100) is selected from one or more in the following vapour source:
Main steam (341); Hot colder section steam (342), hot arc steam (343), intermediate pressure cylinder steam discharge (344), main steam turbine draw gas again, the intermediate steam of boiler unit, auxiliary steam, other have the steam of the degree of superheat.
CN201020181791XU 2010-04-29 2010-04-29 Regenerative steam-driven condensate pump system of power plant Expired - Lifetime CN201714431U (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102230398A (en) * 2011-06-10 2011-11-02 中国电力工程顾问集团华东电力设计院 Single-shaft steam turbine generator unit
CN102678204A (en) * 2011-03-18 2012-09-19 中国电力工程顾问集团华东电力设计院 Single reheating thermal system
CN104100314A (en) * 2014-07-16 2014-10-15 西安热工研究院有限公司 Steam discharge waste heat utilization system of condensing type small turbine for driving induced draft fan
CN105352002A (en) * 2015-11-12 2016-02-24 中国能源建设集团广东省电力设计研究院有限公司 Steam exhausting heat supply system
CN106051460A (en) * 2016-07-22 2016-10-26 中国能源建设集团广东省电力设计研究院有限公司 Optimized arrangement structure of high-temperature reheat steam pipeline of thermal power generating unit

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102678204A (en) * 2011-03-18 2012-09-19 中国电力工程顾问集团华东电力设计院 Single reheating thermal system
CN102678204B (en) * 2011-03-18 2014-12-17 中国电力工程顾问集团华东电力设计院 Single reheating thermal system
CN102230398A (en) * 2011-06-10 2011-11-02 中国电力工程顾问集团华东电力设计院 Single-shaft steam turbine generator unit
CN104100314A (en) * 2014-07-16 2014-10-15 西安热工研究院有限公司 Steam discharge waste heat utilization system of condensing type small turbine for driving induced draft fan
CN104100314B (en) * 2014-07-16 2016-03-02 西安热工研究院有限公司 A kind of condensed steam type small steam turbine exhaust steam bootstrap system driving induced draught fan
CN105352002A (en) * 2015-11-12 2016-02-24 中国能源建设集团广东省电力设计研究院有限公司 Steam exhausting heat supply system
CN105352002B (en) * 2015-11-12 2018-09-25 中国能源建设集团广东省电力设计研究院有限公司 Steam extraction heating system
CN106051460A (en) * 2016-07-22 2016-10-26 中国能源建设集团广东省电力设计研究院有限公司 Optimized arrangement structure of high-temperature reheat steam pipeline of thermal power generating unit
CN106051460B (en) * 2016-07-22 2019-07-19 中国能源建设集团广东省电力设计研究院有限公司 A kind of optimized arrangement structure in fired power generating unit high-temperature reheat pipe road

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