CN204495104U - One-level water-cooled Roots pump type evacuation system for steam condenser - Google Patents
One-level water-cooled Roots pump type evacuation system for steam condenser Download PDFInfo
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- CN204495104U CN204495104U CN201520195263.2U CN201520195263U CN204495104U CN 204495104 U CN204495104 U CN 204495104U CN 201520195263 U CN201520195263 U CN 201520195263U CN 204495104 U CN204495104 U CN 204495104U
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Abstract
The utility model discloses a kind of one-level water-cooled Roots pump type evacuation system for steam condenser, comprise exhaust pipe, exhaust pipe is parallel with two water ring vacuum pump groups, exhaust pipe is also parallel with the vacuum keeping apparatus be connected to form by pipeline by one-level water-cooled lobe pump, water ring vacuum pump, steam-water separator; The air inlet of one-level water-cooled lobe pump is communicated with exhaust pipe, air inlet pipe is provided with control valve, the gas outlet of one-level water-cooled lobe pump is communicated with the air inlet of water ring vacuum pump, and the gas outlet of water ring vacuum pump is communicated with the air inlet of steam-water separator, and the gas outlet of steam-water separator is communicated with air; One-level water-cooled lobe pump is just provided with cooling water inlet to rotor, and cooling water inlet is connected with cooling water pipeline.In the utility model, the end vacuum value of one-level water-cooled lobe pump is much larger than the end vacuum value of water ring vacuum pump group, and not only can maintain the original vacuum values of exhaust pipe, also can improve its vacuum further, amount of energy saving reaches 80%, adds social benefit.
Description
Technical field
The utility model relates to a kind of evacuation system for steam condenser, particularly relates to a kind of one-level water-cooled Roots pump type evacuation system for steam condenser.
Background technology
In power plant, vacuum is larger on gross coal consumption rate impact.For 300-330MW unit, vacuum often improves 1Kpa, and corresponding gross coal consumption rate saves 2.6g/kWh.
Two high-power water ring vacuum pump groups installed by conventional steam turbine generator, the backing line of every platform water ring vacuum pump group is communicated with condenser gas outlet, water ring vacuum pump group comprises the hand-operated valve, motor-driven valve, water ring vacuum pump, condenser, the steam-water separator that are successively connected by pipeline, gives vent to anger to be discharged by the gas exhaust piping be connected with steam-water separator exhaust outlet.The effect of water ring vacuum pump group is the back pressure of the job requirement of setting up steam turbine, ensures the normal work of steam turbine.Simultaneously two water ring vacuum pump groups one run generating set initial start stage two to set up vacuum fast, and the time is generally 30 minutes; Two is after unit normally runs, two units close one, another work, and form two units one opens one for state, may again come into operation by two units when the too high or high back pressure heat supply in winter of circulating water temperature in summer, this kind of pumped vacuum systems power consumption is large simultaneously.
Present thermal power plant vavuum pump operation characteristic and situation are presented as: conventional vaccum-pumping equipment is water-jet pump and water ring vacuum pump, the former gradually substitute by the latter.Water-ring vacuum pump performance is relevant with the state (pressure, temperature) of institute's intake-gas and the temperature of working solution etc.Be subject to the impact of " limit swabbing pressure " simultaneously in running, easily in impeller surface, local water hammer occur, run noise very large and blade can be made to produce very large tension, long-play easily causes the fracture of blade, threatens the safe operation of unit.
Working solution temperature is comparatively large to the performance impact of water ring vacuum pump, and under high water temperature operating mode, its pumping performance declines 80-90% fast, is even zero in certain inlet pressure lower pumping amount.Here it is, and why some unit need start two water ring vacuum pumps to maintain the reason of condenser vacuum in summer.In addition due to the rising of working solution temperature, totally unfavorable to water-ring vacuum pump longtime running, cause following consequence:
(1) destroy vacuum, reduce unit economy
Along with working solution temperature raises, corresponding saturation pressure constantly raises, the pressure for vaporization of such as 30 DEG C is 4.241kpa, the pressure for vaporization of 40 DEG C is 7.25kpa, when water ring vacuum pump swabbing pressure is less than or equal to saturation pressure corresponding to work liquid temperature, some work liquid will be made to vaporize, water ring vacuum pump causes water ring vacuum pump to exert oneself wretched insufficiency because the gas aspirating the vaporization of self working medium and produce ties up water ring vacuum pump rate of air sucked in required, incoagulable gas will cause heat transfer deterioration and destroy condenser vacuum in condenser inner accumulated, the air that in steam, mass content accounts for 1% can make surface coefficient of heat transfer reduce by 60%, thus reduction unit economy.
(2) Water-ring vacuum pump cavitation
Water ring vacuum pump is on-stream, if when the absolute pressure of regional area working solution reduces the working solution pressure for vaporization at temperature at that time, working solution just starts vaporization at this place, produce a large amount of steam and form bubble, when the higher-pressure region of the liquid containing a large amount of bubble forward in impeller, the highly pressurised liquid around bubble causes bubble reduce sharp so that break.In water ring vacuum pump, produce process that bubble and bubbles burst make flow passage components be subjected to destroy is exactly cavitation process in vavuum pump.There is point corrosion in metal surface, there will be cellular damage time serious, if water ring vacuum pump vane has larger residual stress at cavitation position, also can cause Stress Release, crack, have a strong impact on device security Effec-tive Function.
(3) noise of vacuum equipment is large
Because needs set up vacuum fast, the power of motor therefore needed is comparatively large, for 300MW unit, needs the motor of 160KW, long time running, the decibel value (being less than or equal to 85dB) of the far super setting of its noise.
By above-mentioned adverse consequences analysis, set up the power generation such as thermoelectricity, thermoelectricity user and novel industry production standard is that gesture is required, taking effective efficient energy-saving vacuum equipment reach the improvement of original production pattern and technological process and optimize lifting, is the breach of the existing demand application of the industry and the breach of technology enforcement.
Summary of the invention
The technical problems to be solved in the utility model is to provide the one-level water-cooled Roots pump type evacuation system for steam condenser that a kind of pumping efficiency is good, vacuum is high.
For solving the problems of the technologies described above, the utility model comprises the exhaust pipe be connected with condenser gas outlet, described exhaust pipe is parallel with two water ring vacuum pump groups, it is characterized in that described exhaust pipe being also parallel with the vacuum keeping apparatus be connected to form by pipeline by one-level water-cooled lobe pump, water ring vacuum pump, steam-water separator; The air inlet of described one-level water-cooled lobe pump is communicated with exhaust pipe by air inlet pipe, described air inlet pipe is provided with the control valve of control piper break-make, the described gas outlet of one-level water-cooled lobe pump and the air inlet of water ring vacuum pump pass through pipeline connection, the gas outlet of described water ring vacuum pump is communicated with the air inlet of steam-water separator by pipeline, and the gas outlet of described steam-water separator is communicated with air by pipeline; Described one-level water-cooled lobe pump is just provided with cooling water inlet to rotor, and described cooling water inlet is connected with cooling water pipeline.
Described control valve is included in hand-operated valve and motor-driven valve that air inlet pipe is arranged in series.
Described air inlet pipe is provided with the pressure difference switch be arranged in parallel with motor-driven valve, and the signal output part of described pressure difference switch is electrically connected with control circuit respectively with the control end of motor-driven valve.
Return line is provided with between described steam-water separator condensed water discharge outlet and water ring vacuum pump water inlet.
Described return line is provided with radiator.
Pipeline between described one-level water-cooled lobe pump and water ring vacuum pump is provided with back only valve.
Described pipeline all uses seamless pipe to make.
Described cooling water pipeline is demineralized water pipeline, and described steam-water separator is provided with spilling water valve, and the outlet of described spilling water valve is communicated with demineralized water reclaim line.
Described cooling water pipeline is water for industrial use pipeline, and described steam-water separator is provided with spilling water valve, and the outlet of described spilling water valve is communicated with water for industrial use reclaim line.
After adopting said structure, the utility model is arranged in parallel vacuum keeping apparatus on original exhaust pipe, vacuum keeping apparatus mainly comprises one-level water-cooled lobe pump, because the gas major part gas aspirated in exhaust pipe is water vapour, by water vapour condensation, can reach and reduce water ring pump Compressed Gas total load.After unit normally runs, original two groups of water ring vacuum pumps are closed and are switched to vacuum keeping apparatus, because vacuum keeping apparatus power is little, energy-conservation object is reached by the mode large with little generation, and the end vacuum value of one-level water-cooled lobe pump is much larger than the end vacuum value of water ring vacuum pump group, not only can maintain the original vacuum values of exhaust pipe, also can improve its vacuum further, amount of energy saving reaches 80%, adds social benefit.Simultaneously due to one-level water-cooled lobe pump arranging cooling water inlet, cooling water is sprayed directly on on rotor, realize the object of cooled rotor and pump body temperature, guarantee the pumping efficiency of one-level water-cooled lobe pump, even if the vacuum of condenser also can be improved under high water temperature operating mode in summer.In sum, the utility model has the advantage that pumping efficiency is good, vacuum is high and energy-conservation.
Accompanying drawing explanation
Below in conjunction with the drawings and the specific embodiments, the utility model is described in further detail:
Fig. 1 is structural representation of the present utility model.
Detailed description of the invention
As shown in Figure 1, one-level water-cooled Roots pump type evacuation system for steam condenser comprises the exhaust pipe 2 be connected with condenser 1 gas outlet, exhaust pipe 2 is parallel with two water ring vacuum pump groups 9, the concrete structure of water ring vacuum pump group 9 is prior art, does not repeat them here.Exhaust pipe 2 is also parallel with the vacuum keeping apparatus be connected to form by pipeline by one-level water-cooled lobe pump 4, water ring vacuum pump 5, steam-water separator 7.One-level water-cooled lobe pump 4 is provided with cooling water inlet 43, cooling water inlet 43 is connected with cooling water pipeline 44, the position that cooling water inlet 43 is offered makes cooling water be sprayed directly on on rotor, realize the object of cooled rotor and pump body temperature, guarantee the temperature of one-level water-cooled lobe pump 4, ensure its pumping efficiency.
The air inlet 41 of one-level water-cooled lobe pump 4 is communicated with exhaust pipe 2 by air inlet pipe 3, air inlet pipe 3 is provided with the control valve of control piper break-make, control valve is included in hand-operated valve 31 and motor-driven valve 32 that air inlet pipe 3 is arranged in series, the long-time not used time manual-lock hand-operated valve 31 of vacuum keeping apparatus, guarantee the safety of pipeline, when equipment normally runs, hand-operated valve 31 is normally open, air inlet pipe 3 is provided with pressure difference switch 33, the signal output part of pressure difference switch 33 is electrically connected with control circuit respectively with the control end of motor-driven valve 32, the front and rear tube of pressure difference switch 33 is connected in the air inlet pipe 3 of motor-driven valve 32 both sides, when rear Guan Yuqian pipe air pressure difference is lower than certain value, pressure difference switch 33 outputs signal to control circuit, control circuit controls motor-driven valve 32 and opens, the setting of motor-driven valve 32 can fast automaticly be opened, close down air inlet pipe 3 tunnel, improve the controllability of pipeline.The particular circuit configurations of control circuit is prior art, is not summary of the invention of the present utility model, does not repeat them here, and the utility model also can use DCS control system to carry out Long-distance Control by those skilled in the art, improves automatization level, increases work efficiency.
The gas outlet 42 of one-level water-cooled lobe pump 4 is communicated with by the air inlet of pipeline with water ring vacuum pump 5, and on both connecting lines, arrange back only valve 6, prevents carbonated drink suck-back.The gas outlet of water ring vacuum pump 5 is communicated with by the air inlet of pipeline with steam-water separator 7, the gas outlet of steam-water separator 7 is communicated with air by pipeline, return line is provided with between steam-water separator 7 condensed water discharge outlet and water ring vacuum pump 5 water inlet, return line is provided with radiator 8, radiator 8 is connected with bypass cooling water pipe, reduce steam-water separator 7 and the temperature of recirculated water in water ring vacuum pump 5 with this, reach the effect reducing water temperature, ensure the stability that water ring vacuum pump 5 works.Steam-water separator 7 is also provided with spilling water valve, and when cooling water pipeline is water for industrial use pipeline, the outlet of spilling water valve is communicated with water for industrial use reclaim line; When cooling water pipeline is demineralized water pipeline, the outlet of spilling water valve is communicated with demineralized water reclaim line.Because the production cost of demineralized water is higher, this kind of pipeline connecting mode can reduce the operating cost of pumped vacuum systems.
After generating set initial start stage two water ring vacuum pumps 5 groups run simultaneously and set up vacuum fast, manually or automatically switch to vacuum keeping apparatus, gas enters one-level water-cooled lobe pump 4 after compression through air inlet pipe 3, water ring vacuum pump 5 is entered through the gas outlet of one-level water-cooled lobe pump 4, gas enters steam-water separator 7 by the road from water ring vacuum pump 5 gas outlet, gas drains into air from the exhaust outlet of steam-water separator 7, and moisture condensation becomes condensed water to flow in water ring vacuum pump 5 through return line to recycle.
In this vacuum plant, pipeline used all uses seamless pipe to make, and ensures security of the present utility model, stability.Have good anti-cavitation ability when running under a high vacuum for making the utility model, impeller used, disk all adopt stainless steel to make.
The utility model is arranged in parallel vacuum keeping apparatus on original exhaust pipe 2, vacuum keeping apparatus mainly comprises one-level water-cooled lobe pump 4, because the gas major part gas of suction in exhaust pipe 2 is water vapour, by water vapour condensation, can reaches and reduce water ring pump Compressed Gas total load.After unit normally runs, original two groups of water ring vacuum pumps 5 are closed and are switched to vacuum keeping apparatus, because vacuum keeping apparatus power is little, energy-conservation object is reached by the mode large with little generation, and the end vacuum value of one-level water-cooled lobe pump 4 is much larger than the end vacuum value of water ring vacuum pump 5 groups, not only can maintain the original vacuum values of exhaust pipe 2, also can improve its vacuum further, amount of energy saving reaches 80%, adds social benefit.Simultaneously due to one-level water-cooled lobe pump 4 arranging cooling water inlet, cooling water is sprayed directly on on rotor, realize the object of cooled rotor and pump body temperature, guarantee the pumping efficiency of one-level water-cooled lobe pump 4, even if the vacuum of condenser 1 also can be improved under high water temperature operating mode in summer.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model.Previous embodiment has been described in detail the utility model, and for a person skilled in the art, it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature.In every case, within inventive concept scope of the present utility model, any amendment made, equivalent replacement, improvement etc., be all included within protection domain of the present utility model.
Claims (9)
1. an one-level water-cooled Roots pump type evacuation system for steam condenser, comprise the exhaust pipe (2) be connected with condenser (1) gas outlet, described exhaust pipe (2) is parallel with two water ring vacuum pump groups (9), it is characterized in that described exhaust pipe (2) being also parallel with the vacuum keeping apparatus be connected to form by pipeline by one-level water-cooled lobe pump (4), water ring vacuum pump (5), steam-water separator (7); The air inlet of described one-level water-cooled lobe pump (4) is communicated with exhaust pipe (2) by air inlet pipe (3), described air inlet pipe (3) is provided with the control valve of control piper break-make, the gas outlet of described one-level water-cooled lobe pump (4) and the air inlet of water ring vacuum pump (5) pass through pipeline connection, the gas outlet of described water ring vacuum pump (5) is communicated with by the air inlet of pipeline with steam-water separator (7), and the gas outlet of described steam-water separator (7) is communicated with air by pipeline; Described one-level water-cooled lobe pump (4) is just provided with cooling water inlet (43) to rotor, and described cooling water inlet (43) are connected with cooling water pipeline (44).
2. one-level water-cooled Roots pump type evacuation system for steam condenser according to claim 1, is characterized in that described control valve is included in the hand-operated valve (31) and motor-driven valve (32) that air inlet pipe is arranged in series.
3. one-level water-cooled Roots pump type evacuation system for steam condenser according to claim 2, it is characterized in that described air inlet pipe is provided with the pressure difference switch (33) be arranged in parallel with motor-driven valve (32), the signal output part of described pressure difference switch (33) is electrically connected with control circuit respectively with the control end of motor-driven valve (32).
4. one-level water-cooled Roots pump type evacuation system for steam condenser according to claim 1, is characterized in that being provided with return line between described steam-water separator (7) condensed water discharge outlet and water ring vacuum pump (5) water inlet.
5. one-level water-cooled Roots pump type evacuation system for steam condenser according to claim 4, is characterized in that described return line is provided with radiator (8).
6. one-level water-cooled Roots pump type evacuation system for steam condenser according to claim 1, is characterized in that the pipeline between described one-level water-cooled lobe pump (4) and water ring vacuum pump (5) is provided with back only valve (6).
7. one-level water-cooled Roots pump type evacuation system for steam condenser according to claim 1, is characterized in that described pipeline all uses seamless pipe to make.
8. one-level water-cooled Roots pump type evacuation system for steam condenser according to any one of claim 1 to 7, it is characterized in that described cooling water pipeline is demineralized water pipeline, described steam-water separator (7) is provided with spilling water valve (71), and the outlet of described spilling water valve (71) is communicated with demineralized water reclaim line.
9. one-level water-cooled Roots pump type evacuation system for steam condenser according to any one of claim 1 to 7, it is characterized in that described cooling water pipeline is water for industrial use pipeline, described steam-water separator (7) is provided with spilling water valve, and the outlet of described spilling water valve is communicated with water for industrial use reclaim line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520195263.2U CN204495104U (en) | 2015-04-02 | 2015-04-02 | One-level water-cooled Roots pump type evacuation system for steam condenser |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520195263.2U CN204495104U (en) | 2015-04-02 | 2015-04-02 | One-level water-cooled Roots pump type evacuation system for steam condenser |
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| CN204495104U true CN204495104U (en) | 2015-07-22 |
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| CN201520195263.2U Expired - Fee Related CN204495104U (en) | 2015-04-02 | 2015-04-02 | One-level water-cooled Roots pump type evacuation system for steam condenser |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106014997A (en) * | 2016-07-12 | 2016-10-12 | 上海伊莱茨真空技术有限公司 | Three-level-roots-water ring intelligent frequency converting control vacuum system and control method thereof |
| CN111852870A (en) * | 2020-05-06 | 2020-10-30 | 中国电力工程顾问集团中南电力设计院有限公司 | Coal-fired power plant vacuum pump multistage cooling water system and cooling method |
| CN112027553A (en) * | 2020-10-14 | 2020-12-04 | 无锡市红蕾石化管件有限公司 | Water-cooling screw conveyer |
-
2015
- 2015-04-02 CN CN201520195263.2U patent/CN204495104U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106014997A (en) * | 2016-07-12 | 2016-10-12 | 上海伊莱茨真空技术有限公司 | Three-level-roots-water ring intelligent frequency converting control vacuum system and control method thereof |
| CN106014997B (en) * | 2016-07-12 | 2018-07-13 | 上海伊莱茨真空技术有限公司 | A kind of three-level Roots-water ring intelligent frequency-conversion control vacuum system and its control method |
| CN111852870A (en) * | 2020-05-06 | 2020-10-30 | 中国电力工程顾问集团中南电力设计院有限公司 | Coal-fired power plant vacuum pump multistage cooling water system and cooling method |
| CN112027553A (en) * | 2020-10-14 | 2020-12-04 | 无锡市红蕾石化管件有限公司 | Water-cooling screw conveyer |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150722 Termination date: 20160402 |