CN204286142U - Evacuation system for steam condenser - Google Patents
Evacuation system for steam condenser Download PDFInfo
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- CN204286142U CN204286142U CN201420774927.6U CN201420774927U CN204286142U CN 204286142 U CN204286142 U CN 204286142U CN 201420774927 U CN201420774927 U CN 201420774927U CN 204286142 U CN204286142 U CN 204286142U
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Abstract
The utility model discloses a kind of evacuation system for steam condenser, comprise the exhaust pipe be connected with condenser gas outlet, 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 lobe pump, condenser, water ring vacuum pump, steam-water separator; The air inlet of lobe pump is communicated with exhaust pipe by air inlet pipe, air inlet pipe is provided with the control valve of control piper break-make, condenser and lobe pump pass through pipeline connection, the gas outlet of lobe pump and the air inlet of water ring vacuum pump pass through pipeline connection, the gas outlet of water ring vacuum pump is communicated with the air inlet of steam-water separator by pipeline, and the gas outlet of steam-water separator is communicated with air by pipeline.
Description
Technical field
The utility model relates to a kind of efficient energy-saving vacuum plant, particularly relates to one and is applied to thermal power plant's 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 one and can further improve vacuum after generating set normally runs, and reduces the evacuation system for steam condenser of energy consumption.
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 lobe pump, condenser, water ring vacuum pump, steam-water separator; The air inlet of described 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, described condenser and lobe pump pass through pipeline connection, the gas outlet of described 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 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 all electrically connected with control circuit with the control end of motor-driven valve.
Described lobe pump is secondary lobe pump, described condenser is provided with two condensation chambers, the one-level gas outlet of described lobe pump is communicated with the one-level air inlet of condenser by pipeline, described condenser first row gas port is communicated with secondary inlet mouth with the one-level air cooling mouth of lobe pump respectively by pipeline, the secondary gas outlet of described lobe pump is communicated with the secondary inlet mouth of condenser by pipeline, and the second exhaust port of described condenser is communicated with the air inlet of water ring vacuum pump with the secondary air cooling mouth of lobe pump respectively by pipeline.
Pipeline between described condenser second exhaust port and Water-ring vacuum pump steam inlet is provided with back only 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 panel radiator.
Described pipeline all uses seamless pipe to make.
After adopting said structure, by being arranged in parallel vacuum keeping apparatus on original exhaust pipe, 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, its former vacuum values not only can be maintained, also can gas clean-up further, save energy consumption, add social benefit.
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, 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 6, and the concrete structure of water ring vacuum pump group 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 lobe pump 7, condenser 8, water ring vacuum pump 10, steam-water separator 11.
In the present embodiment, secondary lobe pump selected by lobe pump 7, and the condenser 8 with two condensation chambers also selected by condenser 8, and condenser 8 is connected with bypass cooling water pipe.For controlling the temperature of lobe pump housing, lobe pump housing is connected with cooling water pipe and cools lobe pump housing.The one-level air inlet 76 of lobe pump 7 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 4 and motor-driven valve 5 that air inlet pipe 3 is arranged in series, hand-operated valve 4 act as long-time not this valve of used time manual-lock, guarantee the safety of pipeline, when equipment normally runs, hand-operated valve 4 is normally open, air inlet pipe 3 is provided with pressure difference switch 13, the signal output part of pressure difference switch 13 is all electrically connected with control circuit with the control end of motor-driven valve 5, the front and rear tube of pressure difference switch 13 is connected in the air inlet pipe 3 of motor-driven valve 5 both sides, when rear pipe than front pipe air pressure lower than certain air pressure time, pressure difference switch 13 outputs signal to control circuit, control circuit controls motor-driven valve 5 and opens, the setting of motor-driven valve 5 can fast automaticly be opened, close down air inlet pipe 3 tunnel, improve controllability.The particular circuit configurations of control circuit is prior art, 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 one-level gas outlet 71 of lobe pump 7 is communicated with the one-level air inlet 81 of condenser 8 by pipeline, condenser 8 first row gas port 82 is communicated with secondary inlet mouth 73 with the one-level air cooling mouth 72 of lobe pump 7 respectively by pipeline, the secondary gas outlet 74 of lobe pump 7 is communicated with the secondary inlet mouth 83 of condenser 8 by pipeline, the second exhaust port 84 of condenser 8 is communicated with the air inlet of water ring vacuum pump 10 with the secondary air cooling mouth 75 of lobe pump 7 respectively by pipeline, pipeline between condenser 8 second exhaust port 84 and water ring vacuum pump 10 air inlet is provided with back only valve 9, prevent carbonated drink suck-back, the gas outlet of water ring vacuum pump 10 is communicated with by the air inlet of pipeline with steam-water separator 11, the gas outlet of steam-water separator 11 is communicated with air by pipeline, return line 14 is provided with between steam-water separator 11 condensed water discharge outlet and water ring vacuum pump water inlet.The utility model also can vacuumize according to concrete condenser the lobe pump and the condenser that require to choose other types, lobe pump is different, condenser and the pipeline that lobe pump connects also can be thereupon different, concrete connecting line existing technical staff gets final product complete design according to technological requirement and equipment situation without creative work, so do not repeat the syndeton of various lobe pump and condenser one by one at this.
After generating set initial start stage two water ring vacuum pumps 10 groups run simultaneously and set up vacuum fast, manually or automatically switch to vacuum keeping apparatus, gas enters lobe pump 7 after one stage of compression through air inlet pipe 3, first condensation chamber of condenser 8 is entered through the one-level gas outlet 71 of lobe pump 7, export from condenser 8 first row gas port 82 through condensed gas, portion gas delivers to the one-level air cooling mouth 72 of lobe pump 7 by the road, for cooling the gas of coming in from lobe pump 7 one-level air inlet 76, remainder gas delivers to the secondary inlet mouth 73 of lobe pump 7 by the road, second condensation chamber of condenser 8 is entered after lobe pump 7 two-stage compression, this time cooled gas, part delivers to the secondary air cooling mouth 75 of lobe pump 7 by the road, for cooling the gas of coming in from lobe pump 7 secondary air inlet 73, remainder gas enters water ring vacuum pump 10 by the road, gas enters steam-water separator 11 by the road from water ring vacuum pump 10 gas outlet, gas drains into air from the exhaust outlet of steam-water separator 11, moisture condensation becomes condensed water to flow in water ring vacuum pump 10 through return line to recycle.For controlling the water temperature of condensed water, return line 14 is provided with panel radiator 12, and panel radiator 12 is connected with bypass cooling water pipe, reduces steam-water separator 11 and the temperature of recirculated water in water ring vacuum pump 10, reach the effect reducing water temperature with this.
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 uses the lobe pump 7 fabulous maintenance of energy and improves vacuum values, and execution efficiency significantly improves, and the gas major part of aspirating is water vapour, by water vapour condensation, reaches and reduces water ring vacuum pump 10 Compressed Gas total load.Vacuum keeping apparatus power is little, in normal operation, reaches energy-conservation object, greatly reduce energy consumption by the mode large with small band, and the vaccum-pumping equipment configured relative to former machine is energy-conservation reaches 80%.Vacuum keeping apparatus has self-suction, and separately need not add the inner loop that booster pump can ensure working solution, its pumping performance does not also restrict by working solution temperature, relatively improves condenser 1 vacuum.Vacuum keeping apparatus floor space is little, operates steadily, and noise significantly reduces, and reliability is high, and cost of equipment maintenance is low.
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 (8)
1. an evacuation system for steam condenser, comprise the exhaust pipe (2) be connected with condenser (1) gas outlet, described exhaust pipe is parallel with two water ring vacuum pump groups (6), it is characterized in that described exhaust pipe (2) being also parallel with the vacuum keeping apparatus be connected to form by pipeline by lobe pump (7), condenser (8), water ring vacuum pump (10), steam-water separator (11); The air inlet of described lobe pump (7) 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, described condenser (8) and lobe pump (7) pass through pipeline connection, the gas outlet of described lobe pump (7) and the air inlet of water ring vacuum pump (10) pass through pipeline connection, the gas outlet of described water ring vacuum pump (10) is communicated with by the air inlet of pipeline with steam-water separator (11), and the gas outlet of described steam-water separator (11) is communicated with air by pipeline.
2. evacuation system for steam condenser according to claim 1, is characterized in that described control valve is included in the hand-operated valve (4) and motor-driven valve (5) that air inlet pipe (3) is arranged in series.
3. evacuation system for steam condenser according to claim 2, it is characterized in that described air inlet pipe (3) is provided with the pressure difference switch (13) be arranged in parallel with motor-driven valve (5), the signal output part of described pressure difference switch (13) is all electrically connected with control circuit with the control end of motor-driven valve.
4. evacuation system for steam condenser according to any one of claim 1 to 3, it is characterized in that described lobe pump (7) is for secondary lobe pump, described condenser (8) is provided with two condensation chambers, the one-level gas outlet of described lobe pump (7) is communicated with by the one-level air inlet of pipeline with condenser (8), described condenser (8) first row gas port is communicated with secondary inlet mouth with the one-level air cooling mouth of lobe pump (7) respectively by pipeline, the secondary gas outlet of described lobe pump (7) is communicated with by the secondary inlet mouth of pipeline with condenser (8), the second exhaust port of described condenser (8) is communicated with the air inlet of water ring vacuum pump (10) with the secondary air cooling mouth of lobe pump (7) respectively by pipeline.
5. evacuation system for steam condenser according to claim 4, is characterized in that the pipeline between described condenser (8) second exhaust port and water ring vacuum pump (10) air inlet is provided with back only valve (9).
6. evacuation system for steam condenser according to claim 4, is characterized in that being provided with return line (14) between described steam-water separator (11) condensed water discharge outlet and water ring vacuum pump water inlet.
7. evacuation system for steam condenser according to claim 6, is characterized in that described return line (14) is provided with panel radiator (12).
8. evacuation system for steam condenser according to claim 1, is characterized in that described pipeline all uses seamless pipe to make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420774927.6U CN204286142U (en) | 2014-12-11 | 2014-12-11 | Evacuation system for steam condenser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420774927.6U CN204286142U (en) | 2014-12-11 | 2014-12-11 | Evacuation system for steam condenser |
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| Publication Number | Publication Date |
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| CN204286142U true CN204286142U (en) | 2015-04-22 |
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| CN201420774927.6U Active CN204286142U (en) | 2014-12-11 | 2014-12-11 | Evacuation system for steam condenser |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104949541A (en) * | 2015-06-29 | 2015-09-30 | 深圳市成德机械有限公司 | Device and method for improving vacuum of power plant condenser and thermal power generation system |
| CN106288849A (en) * | 2016-08-01 | 2017-01-04 | 河北大唐国际张家口热电有限责任公司 | A kind of condenser vaccum-pumping equipment and control method |
| WO2018010536A1 (en) * | 2016-07-12 | 2018-01-18 | 上海伊莱茨真空技术有限公司 | Three-level roots water-ring intelligent frequency conversion control vacuum system and control method therefor |
| CN109073302A (en) * | 2016-03-02 | 2018-12-21 | 高效能源有限责任公司 | Heat pump with air pocket, the method for running the heat pump with air pocket and the method for manufacturing the heat pump with air pocket |
-
2014
- 2014-12-11 CN CN201420774927.6U patent/CN204286142U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104949541A (en) * | 2015-06-29 | 2015-09-30 | 深圳市成德机械有限公司 | Device and method for improving vacuum of power plant condenser and thermal power generation system |
| CN109073302A (en) * | 2016-03-02 | 2018-12-21 | 高效能源有限责任公司 | Heat pump with air pocket, the method for running the heat pump with air pocket and the method for manufacturing the heat pump with air pocket |
| US10921031B2 (en) | 2016-03-02 | 2021-02-16 | Efficient Energy Gmbh | Heat pump with a gas trap, method for operating with a gas trap, and method for producing a heat pump with a gas trap |
| CN109073302B (en) * | 2016-03-02 | 2021-09-28 | 高效能源有限责任公司 | Heat pump with air trap, method for operating a heat pump with air trap, and method for producing a heat pump with air trap |
| WO2018010536A1 (en) * | 2016-07-12 | 2018-01-18 | 上海伊莱茨真空技术有限公司 | Three-level roots water-ring intelligent frequency conversion control vacuum system and control method therefor |
| GB2568609A (en) * | 2016-07-12 | 2019-05-22 | Elivac Co Ltd | Three-level roots water-ring intelligent frequency conversion control vacuum system and control method therefor |
| CN106288849A (en) * | 2016-08-01 | 2017-01-04 | 河北大唐国际张家口热电有限责任公司 | A kind of condenser vaccum-pumping equipment and control method |
| CN106288849B (en) * | 2016-08-01 | 2019-08-20 | 河北大唐国际张家口热电有限责任公司 | A kind of condenser vaccum-pumping equipment |
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