CN101571141B - Sealed water recovery system of feed pump - Google Patents
Sealed water recovery system of feed pump Download PDFInfo
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- CN101571141B CN101571141B CN2009103031301A CN200910303130A CN101571141B CN 101571141 B CN101571141 B CN 101571141B CN 2009103031301 A CN2009103031301 A CN 2009103031301A CN 200910303130 A CN200910303130 A CN 200910303130A CN 101571141 B CN101571141 B CN 101571141B
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Abstract
The invention discloses a sealed water recovery system of a feed pump, which comprises a return water tank, a sealed water inlet pipe, a sealed water outlet pipe, regulating valves of backwater pipes,an exhaust pipe, an overflow pipe and a discharge pipe. The invention has the advantages of simple structure of the return water tank, simply system configuration, small occupying space and little in vestment. The sealed water recovery system of the feed pump needs no cooling water, no priming, has good water seal effect, and convenient operating maintenance. The electric pump has good adaptability.
Description
Technical field
The present invention relates to a kind of reclaiming system that seals water, particularly relate to a kind of reclaiming system of Sealing Water for Feedwater Pump.
Background technique
The sealing of feed water pump axle head realizes by injecting the water of condensation higher than its sealed chamber's internal pressure, passes through axle envelope place toward external leakage to prevent the medium in the feed water pump pump housing, and for reducing the working medium loss, water of condensation is all reclaimed.For reducing influence and the unit operation flexibility to the main frame vacuum, the Sealing Water for Feedwater Pump backwater directly is not connected to vapour condenser, reclaims and drain into vapour condenser behind sealed water recovery system.
Sealed water recovery system of feed pump mainly adopts following two kinds of forms at present:
(1) Multistage U shape seal water system
As shown in Figure 1, Multistage U shape seal water system comprises Multistage U shape liquid packing 21, sealing water intake pipe 22, sealing water outlet conduit 23, filling pipe 24, priming level controlling plumbing fixtures 25, drainage pipe 26, exhaust duct 27 and blow-off line 28 compositions, and corresponding separating valve is set on each pipeline.
Whether liquid packing need be observed water by the priming level controlling plumbing fixtures and fill with by filling pipe elder generation fills with water before Multistage U type seal water system started first; Exhaust duct is used to drain air; For ease of the flushing, the maintenance discharge water, blowdown, the minimum point of every grade of bottom of liquid packing need be provided with blow-off line and valve.Isolate drainage for overhaul for ease of the liquid packing accident, system is provided with before liquid packing to the drainage pipe of circulating water pipe hole and valve.
For preventing that the Sealing Water for Feedwater Pump backwater from squeezing mutually, every Sealing Water for Feedwater Pump backwater should be provided with a Multistage U shape liquid packing separately; For the position that prevents the not smooth Multistage U shape liquid packing of Sealing Water for Feedwater Pump backwater should be lower than feed water pump axle head sealing water drain opening, generally be arranged in steam turbine building 0m layer; Multistage U shape liquid packing outlet absolute altitude should be more than the condenser hotwell highest water level, and the water return pipeline of liquid packing outlet arranges that absolute altitude also should be higher than the condenser hotwell highest water level and avoid water return pipeline to form bag shape.
Multistage U shape seal water system is because the liquid packing structural reason, the multilevel water seal final stage generally have the part vaporization easily cause the Sealing Water for Feedwater Pump backwater smooth in addition can't reclaim, axle head gives a tongue-lashing water and the phenomenon that causes intaking in the bearing oil; Liquid packing manufacturing difficulty, bottom are easily assembled welding slag and are stopped up and not easy to clean, maintenance; Multistage U shape seal water system system layout complexity, the corresponding cover Multistage U shape liquid packing of pump takes up an area of greatly, and investment is big; Need to start water filling.
2) single-stage seal water system
As shown in Figure 2, the single-stage seal water system comprises single-stage liquid packing 41, sealing water intake pipe 42, sealing water outlet conduit 43, cooling water pipeline 44 and modulating valve group 49, exhaust 45, the outlet of single-stage liquid packing standpipe 46, overflow pipe 47 and drainage pipe 48, and corresponding separation valve door is set on each pipeline.
This system has carried out improvement, simplification on the basis of Multistage U shape seal water system, the single-stage liquid packing leads to atmosphere, backwater after the dilatation step-down again a high position drain into vapour condenser, single-stage liquid packing outlet standpipe forms certain liquid-column height water seal to prevent the destruction of condenser vacuum.Because general about about 60 ℃ of Sealing Water for Feedwater Pump return water temperature, corresponding pressure for vaporization is about 19.9kPa(a), normally move back pressure far above vapour condenser, if the water that no temperature is low injects desuperheat, then the backwater in the return water tank outlet return riser can be vaporized, can not form effective liquid-column height, not have the effect of water seal, the main frame vacuum can be destroyed.Inject cooling water and prevent the backwater vaporization on the one hand, start the water filling water seal on the other hand, guarantee the foundation of unit vacuum.
Compare with Multistage U shape seal water system, the advantage of single-stage seal water system is: because can a shared single-stage liquid packing, system layout is simple relatively; Shortcoming is: need to start water filling equally; And electric pump adaptability is relatively poor, needs to arrange very low; Also need cooling water, increased the condensate pump power consumption.
Summary of the invention
In order to overcome the above-mentioned shortcoming of prior art, the invention provides a kind of simple, reliable, flexible, the sealed water recovery system of feed pump that the water seal effect is good.
The technical solution adopted for the present invention to solve the technical problems is: a kind of sealed water recovery system of feed pump, comprise: return water tank, sealing water intake pipe, sealing water outlet conduit, exhaust duct, overflow pipe, the water outlet of sealing water outlet conduit one termination return water tank bottom, a termination vapour condenser; On sealing water outlet conduit water return pipeline modulating valve group is set, water return pipeline modulating valve group is connected in series back and vacuum normally close valve successively and is connect by gate valve, pneumatic control valve, vacuum valve and forms; Described return water tank position is lower than feed water pump axle head sealing water drain opening absolute altitude.
For ease of flushing, maintenance discharge water, blowdown, can also blowdown piping and normal closed gate be set in the minimum point of return water tank bottom.
Compared with prior art, good effect of the present invention is: carried out improvement, simplification on the single-stage seal water system, return water tank leads to atmosphere, backwater through the dilatation step-down after water return pipeline modulating valve group drains into vapour condenser.Cancel cooling water pipeline and modulating valve on the water return pipeline of outlet standpipe, single-stage seal water system of single-stage liquid packing, on water return pipeline, set up the modulating valve group.Backwater resistance behind modulating valve increases to reach that Multistage U shape liquid packing increases resistance or alternative single-stage seal water system return riser and the water seal purpose is kept the certain water level of water tank by the modulating valve group and guaranteed not leak vacuum.
Water return pipeline modulating valve group is regulated automatically according to the return water tank water level signal.But return water tank water outlet backwater is to the interface position of vapour condenser both low level, that is: more than the condenser hotwell highest water level, also can be high-order, that is: be connected near the condenser throat, a high position is connected to vapour condenser so that backwater heat absorption deoxygenation reduces condensate pump inlet oxygen content.
To sum up, advantage of the present invention is: return water tank is simple in structure, and system layout is simple, and the occupation of land space is little, less investment; Do not need cooling water, also do not need to start water filling, water seal is effective, and operation maintenance is convenient; Electric pump adaptability (arranging that deaerator bay is at the 0m layer) is good.
Description of drawings
The present invention will illustrate by example and with reference to the mode of accompanying drawing.
Fig. 1 is the system layout connection diagram of Multistage U shape seal water system;
Fig. 2 is the system layout connection diagram of single-stage seal water system;
Fig. 3 is a system layout connection diagram of the present invention.
Embodiment
Disclosed all features in this specification, or the step in disclosed all methods or the process except mutually exclusive feature and/or step, all can make up by any way.
Disclosed arbitrary feature in this specification (comprising any accessory claim, summary and accompanying drawing) is unless special narration all can be replaced by other equivalences or the alternative features with similar purpose.That is, unless special narration, each feature is an example in a series of equivalences or the similar characteristics.
As shown in Figure 3, a kind of sealed water recovery system of feed pump comprises: return water tank 1, sealing water intake pipe 2 and valve 3, sealing water outlet conduit 4 and water return pipeline modulating valve group 5, exhaust duct 6, overflow pipe 7, blowdown piping 8 and normal closed gate 9.
Sealing water intake pipe 2 one termination water pump shaft end seal water drain opening, the water intake on a termination return water tank 1 top is provided with valve 3 on sealing water intake pipe 2; The water outlet of sealing water outlet conduit 4 one termination return water tanks 1 bottom, a termination vapour condenser 15, sealing water outlet conduit 4 is provided with water return pipeline modulating valve group 5; On return water tank 1 top exhaust duct 6 is set, straight-through atmosphere; On return water tank 1 top overflow pipe 7 is set; In return water tank 1 bottom blowdown piping 8 is set, normal closed gate 9 is set on blowdown piping 8.
Water return pipeline modulating valve group 5 comprises vacuum normally close valve 10, gate valve 11, pneumatic control valve 12, vacuum valve 13, and wherein gate valve 11, pneumatic control valve 12, vacuum valve 13 are connected in series back and vacuum normally close valve 10 successively and connect.
The same with the single-stage seal water system, not smooth for preventing the Sealing Water for Feedwater Pump backwater, the return water tank position of this system should be lower than feed water pump axle head sealing water drain opening absolute altitude, generally can be arranged in side, steam turbine building 0m layer or vapour condenser hole.
Before the foundation of unit starting main frame vacuum, water return pipeline modulating valve group should be closed, and water tank to be recycled is opened when certain water level.
The present invention is not limited to aforesaid embodiment.The present invention expands to any new feature or any new combination that discloses in this manual, and the arbitrary new method that discloses or step or any new combination of process.
Claims (2)
1. sealed water recovery system of feed pump, comprise: return water tank, sealing water intake pipe, sealing water outlet conduit, exhaust duct, overflow pipe, it is characterized in that: the water outlet of sealing water outlet conduit one termination return water tank bottom, a termination vapour condenser; On sealing water outlet conduit water return pipeline modulating valve group is set, water return pipeline modulating valve group is connected in series back and vacuum normally close valve successively and is connect by gate valve, pneumatic control valve, vacuum valve and forms; Described return water tank position is lower than feed water pump axle head sealing water drain opening absolute altitude.
2. sealed water recovery system of feed pump according to claim 1 is characterized in that: in the return water tank bottom blowdown piping and normal closed gate are set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009103031301A CN101571141B (en) | 2009-06-10 | 2009-06-10 | Sealed water recovery system of feed pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009103031301A CN101571141B (en) | 2009-06-10 | 2009-06-10 | Sealed water recovery system of feed pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101571141A CN101571141A (en) | 2009-11-04 |
| CN101571141B true CN101571141B (en) | 2011-01-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009103031301A Active CN101571141B (en) | 2009-06-10 | 2009-06-10 | Sealed water recovery system of feed pump |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102900662A (en) * | 2012-10-31 | 2013-01-30 | 忻州广宇煤电有限公司 | Water-feeding pump seal water return water recovery device |
| CN106640736B (en) * | 2016-09-18 | 2019-03-01 | 重庆华峰化工有限公司 | The sealing method for washing of size circulations pump in cyclohexanol device |
| CN107165854B (en) * | 2017-05-08 | 2023-11-14 | 华电电力科学研究院有限公司 | Automatic control and recovery device for sealing water of water supply pump |
| CN110081000A (en) * | 2019-04-22 | 2019-08-02 | 中国神华能源股份有限公司 | Generating set |
| CN114704458B (en) * | 2022-04-02 | 2023-04-28 | 中国电建集团江西省电力设计院有限公司 | Sealing water system of steam feed pump of 9H-cascade circulating gas turbine unit |
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2009
- 2009-06-10 CN CN2009103031301A patent/CN101571141B/en active Active
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| CN101571141A (en) | 2009-11-04 |
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Owner name: CHINA POWER ENGINEERING CONSULTING GROUP SOUTHWEST Free format text: FORMER NAME: SOUTHWEST ELECTRIC POWER DESIGN INSTITUTE OF CHINA POWER ENGINEERING CONSULTING GROUP CORPORATION |
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Address after: 610021 No. 18 Dongfeng Road, Sichuan, Chengdu Patentee after: China Power Engineering Consulting Group Southwest Electric Power Design Institute Co., Ltd. Address before: 610021 No. 18 Dongfeng Road, Sichuan, Chengdu Patentee before: Southwest Electric Power Design Institute of China Power Engineering Consulting Group Corporation |