CN103940256B - With pressure controlled plant condenser vapor injection vacuum pumping system - Google Patents
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- CN103940256B CN103940256B CN201410144155.2A CN201410144155A CN103940256B CN 103940256 B CN103940256 B CN 103940256B CN 201410144155 A CN201410144155 A CN 201410144155A CN 103940256 B CN103940256 B CN 103940256B
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- 238000005086 pumping Methods 0.000 title claims abstract description 14
- 238000002347 injection Methods 0.000 title claims abstract description 13
- 239000007924 injection Substances 0.000 title claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 79
- 239000007788 liquid Substances 0.000 claims abstract description 70
- 238000010079 rubber tapping Methods 0.000 claims abstract description 17
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 9
- 230000001105 regulatory effect Effects 0.000 claims abstract description 9
- 238000010992 reflux Methods 0.000 claims description 13
- 239000000498 cooling water Substances 0.000 claims description 9
- 238000013461 design Methods 0.000 claims description 9
- 238000002955 isolation Methods 0.000 claims description 7
- 238000012544 monitoring process Methods 0.000 claims description 4
- 239000002826 coolant Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000003245 coal Substances 0.000 abstract description 3
- 239000012224 working solution Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000008236 heating water Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008450 motivation Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Abstract
The invention provides a kind of with pressure controlled plant condenser vapor injection vacuum pumping system, comprise: steam turbine (1), condenser (2), condenser hotwell (3), power steam voltage-stablizer (6), steam jet ejector (11), stram condenser (12), water ring vacuum pump (14), the condensate liquid tapping valve (8) of stram condenser, condensate liquid hydrophobic pipeline water seal (17), the liquid-level switch (18) of condensate liquid pipeline, the pressure-regulating valve (13) of Water-ring vacuum pump intake and the multiple control valve be arranged between above-mentioned all parts and pipeline, because the inlet pressure of system adopts the Stress control of power steam, condensate liquid is back to condenser hotwell Liquid level and water ring vacuum pump controls, this pumped vacuum systems can maintain the most high vacuum of condenser, improve exerting oneself of condenser, condenser vacuum is improved, reduce the heat consumption rate of steam turbine, reduce unit generation coal consumption.Security of system, non-maintaining, the exerting oneself and steady in a long-termly to run of guarantee system 100%.Final stage exhaust apparatus water ring vacuum pump arranges pressure backflow regulating system, guarantees that water ring vacuum pump cavitation can not occur.
Description
Technical field
The present invention relates to the pumped vacuum systems in a kind of power plant, especially relate to a kind of with pressure controlled plant condenser vapor injection vacuum pumping system.
Background technology
Condenser is one of most important equipment in power plant, and back pressure of condenser has material impact to the economy that turbine LP rotors runs, and the quality of condensing steam turbine generator group condenser vacuum, directly affects the economical operation of temperature of power plant steam turbine.The factor affecting condenser vacuum is a lot, and comprise the system relevant to condenser vacuum and arrange, this design arrangement affects the quality of condenser vacuum.Multiple condenser has reduction Specific Heat Consumption For Steam Turbine Unit, reduces film-cooled heat and cooling water inflow, improve the advantages such as condenser layout, the back pressure value of each condenser is under the given condition such as Steam Turbine thermodynamic property, circulating water temperature, quantity of circulating water, heat-exchange system, is determined by technology and economy comparison.When actual motion, the best back pressure value of condenser is also change at any time along with factors such as unit load, circulating water temperature and the water yield, condenser clean-up performances, and best back pressure value just can will draw by calculating the associated hot force parameter of steam turbine and condenser.
At present, the power plant of more than 300MW condensing steam turbine generator group, its evacuation system for steam condenser, generally all adopts 2 or multiple stage water ring vacuum pump pumped vacuum systems.Water ring vacuum pump is adopted to there is shortcoming below as pumping equipment:
One, water ring vacuum pump is using water as working solution, the temperature of working solution is subject to the control of cooling water (recirculated water or beginning water), cooling water temperature is subject to weather influence, variations in temperature is larger, particularly summer, circulating water temperature may reach 30 more and spend, add certain heat transfer temperature difference, working solution temperature likely reaches 40 more and spends, working solution is vaporized in a large number and is caused vavuum pump to cavitate and produce high noisy under vacuo, exhaust capacity declines, and cannot maintain the minimum vacuum of condenser, has had a strong impact on economy life and the safe operation of unit.
Two, water ring vacuum pump power consumption is high, and normal need runs one or two water ring vacuum pumps.
Three, water ring vacuum pump is dynamic equipment, and plant maintenance amount is larger.
Therefore, the evacuation system for steam condenser technology proposing a kind of safety and reliability is needed, to solve the problem.
Summary of the invention
The invention provides a kind of with pressure controlled plant condenser vapor injection vacuum pumping system, it is by the Stress control of Liquid level, power steam, and the inlet pressure of water ring vacuum pump controls, and can solve the problem.
The invention discloses a kind of with pressure controlled plant condenser vapor injection vacuum pumping system, described pumped vacuum systems comprises:
The condensate liquid tapping valve of steam turbine, condenser, condenser hotwell, power steam voltage-stablizer, steam jet ejector, stram condenser, water ring vacuum pump, stram condenser, the water seal of condensate liquid hydrophobic pipeline, the liquid-level switch of condensate liquid pipeline, the pressure-regulating valve of Water-ring vacuum pump intake and the multiple control valve be arranged between above-mentioned all parts and pipeline;
It is characterized in that:
The outlet of steam turbine is connected with the entrance of condenser; First entrance of steam jet ejector connects power steam voltage-stablizer, and the second entrance of steam jet ejector connects the outlet of condenser; First outlet of steam jet ejector connects stram condenser; First entrance of stram condenser connects cooling water inlet, and the first outlet of stram condenser connects coolant outlet, and the second outlet of stram condenser connects water ring vacuum pump, and the 3rd outlet of stram condenser connects condenser hotwell; First entrance of water ring vacuum pump connects stram condenser second and exports, the first outlet row air of water ring vacuum pump; On pipeline between steam inlet and the first entrance of steam jet ejector, be disposed with power steam inlet isolation valve, power steam pressure-regulating valve and power steam voltage-stablizer; On the pipeline between first outlet and the first entrance of water ring vacuum pump of water ring vacuum pump, be provided with the pressure-regulating valve of Water-ring vacuum pump intake; On the pipeline between the 3rd outlet and condenser hotwell of stram condenser, be disposed with the condensate liquid tapping valve of the water seal of condensate liquid hydrophobic pipeline and stram condenser; The liquid-level switch of condensate liquid pipeline is provided with at the condenser water leg place of stram condenser; The automatic shutter of the condensate liquid tapping valve of described liquid-level switch coordinating with steam rapid heat cycle condenser.Described power steam pressure-regulating valve coordinates the pressure transmitter of power steam automatically to regulate opening and closing; The pressure-regulating valve of described Water-ring vacuum pump intake coordinates pressure transmitter automatically to regulate opening and closing.
According to pumped vacuum systems of the present invention, it is characterized in that: the pressure transmitter also comprising power steam control valve, power steam; Wherein the pressure transmitter of power steam voltage-stablizer, power steam pressure-regulating valve and power steam forms steam source of stable pressure system jointly; Pressure change inside the pressure transmitter monitoring power steam voltage-stablizer of power steam, when internal pressure is higher than design pressure, the pressure transmitter of power steam transmits a signal to power plant Distributed Control System (distributedcontrolsystems, hereinafter referred to as DCS system), DCS system output signal is opened and is regulated power steam pressure-regulating valve; The power steam flow entering steam pressurizer is controlled by regulating the aperture of power steam pressure-regulating valve.
According to pumped vacuum systems of the present invention, it is characterized in that: described pumped vacuum systems also comprises the pressure transmitter of Water-ring vacuum pump intake and the pressure-regulating valve of Water-ring vacuum pump intake, the pressure of the pressure transmitter monitoring Water-ring vacuum pump intake of vacuum pump inlet, when pressure transmits a signal to DCS system lower than during setting value, DCS system output signal opens the pressure-regulating valve of vacuum pump inlet, controls by the aperture of the pressure-regulating valve of vacuum pump inlet the reflux gas flow entering water ring vacuum pump.
According to pumped vacuum systems of the present invention, it is characterized in that: the air entry valve being provided with steam jet ejector on the pipeline between the outlet and the second entrance of steam jet ejector of condenser; Pipeline between the outlet and the first entrance of water ring vacuum pump of condenser is provided with condenser to bleed the isolating valve of pipeline.
According to pumped vacuum systems of the present invention, it is characterized in that: described pumped vacuum systems also comprises the power steam inlet isolation valve be arranged on before power steam source of stable pressure.
When the steam jet ejector in said system runs, its advantage is: the no minimum that can maintain condenser, improves exerting oneself of condenser.The ability that system vacuumizes improves, and condenser vacuum improves, and reduces the heat consumption rate of steam turbine, reduces the gross coal consumption rate of unit.Security of system is reliable, non-maintaining.Whole system no-rotary part, mechanical is worn and torn, exerting oneself and operation steady in a long-term of guarantee system 100%.Adopt vapor injection vacuum pumping system, do not need power consumption, reduce electric cost.
With regard to pumped vacuum systems of the present invention, its beneficial effect is:
1. condenser vapor injection vacuum pumping system, the not condensable gas in the principle suction condenser adopting steam to spray, ensures the no minimum of condenser.
2. final stage exhaust liquid-ring vacuum pump arranges pressure backflow regulating system, guarantees that liquid-ring vacuum pump cavitation can not occur.
3. power steam voltage-stablizer, pressurizer system is by pressure transmitter, pressure-regulating valve, and voltage-stablizer forms.Realize stablize injector inlet pressure, for steam jet ejector provides stable power, the guarantee design treatment of steam jet ejector stable operation.
In addition, bottom pressure buffer, be provided with automatic steam trap, avoid the aqueous water be mingled with in power steam enter steam jet ejector and damage power jet.
Therefore, the technical scheme that the present invention proposes solves problems of the prior art.
Accompanying drawing explanation
Below with reference to the accompanying drawings the detailed description of the invention of design according to the present invention is done and explain in detail further, wherein:
Fig. 1 display is according to the design of the present invention with pressure controlled plant condenser vapor injection vacuum pumping system.
Reference numeral annotation in figure is as follows:
1, steam turbine
2, condenser
3, condenser hotwell
4, the inlet isolation valve of power steam
5, the air entry valve of steam jet ejector
6, power steam voltage-stablizer
7, condenser is bled the isolating valve of pipeline
8, the condensate liquid tapping valve of stram condenser
9, the exhaust isolating valve of stram condenser
10, the pressure transmitter of vacuum pump inlet
11, steam jet ejector
111, the first entrance of steam jet ejector
112, the second entrance of steam jet ejector
113, the first outlet of steam jet ejector
12, stram condenser
121, the first entrance of stram condenser
122, the first outlet of stram condenser
123, the second outlet of stram condenser
124, the 3rd outlet of stram condenser
13, the pressure-regulating valve of vacuum pump inlet
14, water ring vacuum pump
141, the first entrance of the first water ring vacuum pump
142, the first outlet of the first water ring vacuum pump
15, steam control valve
16, the pressure transmitter of power steam
17, condensate liquid hydrophobic pipeline water seal
18, the liquid-level switch of condensate liquid pipeline
19, the automatic steam trap of vacuum tank
Detailed description of the invention
Below in conjunction with the accompanying drawing of the application, when with reference to the present invention's design, detailed description of the invention is made an explanation.
With reference to figure 1, of the present invention with in pressure controlled plant condenser vapor injection vacuum pumping system, comprising:
The condensate liquid tapping valve 8 of steam turbine 1, condenser 2, condenser hotwell 3, power steam voltage-stablizer 6, steam jet ejector 11, stram condenser 12, water ring vacuum pump 14, stram condenser, condensate liquid hydrophobic pipeline water seal 17, the liquid-level switch 18 of condensate liquid pipeline, the pressure-regulating valve of Water-ring vacuum pump intake and the multiple control valve be arranged between above-mentioned all parts and pipeline;
The outlet of steam turbine 1 is connected with the entrance of condenser 2; First entrance 111 of steam jet ejector connects power steam vacuum tank 6, and the first outlet 113 of steam jet ejector connects stram condenser 12;
The outlet of condenser 2 is connected with the second entrance 112 of steam jet ejector;
First entrance 121 of stram condenser connects cooling water inlet, and the first outlet 122 of stram condenser connects coolant outlet, and the second outlet 123 of stram condenser connects water ring vacuum pump 14, and the 3rd outlet 124 of stram condenser connects condenser hotwell 3;
First entrance 141 of water ring vacuum pump connects stram condenser second and exports 123, the first outlet 143 row air of water ring vacuum pump;
On pipeline between steam inlet and the first entrance 111 of steam jet ejector, be disposed with power steam inlet isolation valve 4, power steam pressure-regulating valve 15 and power steam voltage-stablizer 6;
On the pipeline 142 between first outlet 143 and the first entrance 141 of water ring vacuum pump of water ring vacuum pump, be provided with the pressure-regulating valve 13 of Water-ring vacuum pump intake;
On the pipeline between the 3rd outlet 124 and condenser hotwell 3 of stram condenser, be disposed with the condensate liquid tapping valve 8 of condensate liquid hydrophobic pipeline water seal 17 and stram condenser;
The liquid-level switch 18 of condensate liquid pipeline is provided with at the condenser water leg place of stram condenser 12;
The automatic shutter of the condensate liquid tapping valve 8 of described liquid-level switch 18 coordinating with steam rapid heat cycle condenser.
Described power steam pressure-regulating valve 15 coordinates the pressure transmitter 16 of power steam automatically to regulate opening and closing;
The pressure-regulating valve 13 of described Water-ring vacuum pump intake coordinates pressure transmitter 10 automatically to regulate opening and closing.
Also comprise the pressure transmitter 16 of power steam control valve 15, power steam; The wherein pressure transmitter 16 of power steam voltage-stablizer 6, power steam control valve 15 and power steam composition steam source of stable pressure system jointly; The pressure change inside power steam voltage-stablizer 6 monitored by the pressure transmitter 16 of power steam, when internal pressure is higher than design pressure, the pressure transmitter 16 of power steam transmits a signal to DCS system, and DCS system output signal is opened and regulated power steam control valve 15; The power steam flow entering steam vacuum tank 6 is controlled by regulating the aperture of power steam pressure-regulating valve 15.
Described pumped vacuum systems also comprises the pressure transmitter 10 of Water-ring vacuum pump intake and the pressure-regulating valve 13 of Water-ring vacuum pump intake, the pressure of Water-ring vacuum pump intake monitored by the pressure transmitter 10 of vacuum pump inlet, when pressure transmits a signal to DCS system lower than during setting value, DCS system output signal opens the pressure-regulating valve 13 of vacuum pump inlet, controls by the aperture of the pressure-regulating valve 13 of vacuum pump inlet the reflux gas flow entering water ring vacuum pump 14.
Pipeline between the outlet and the second entrance 112 of steam jet ejector 11 of condenser 2 is provided with the air entry valve 5 of steam jet ejector; Pipeline between the outlet and the first entrance 141 of water ring vacuum pump of condenser 2 is provided with condenser to bleed the isolating valve 7 of pipeline.
Described pumped vacuum systems also comprises the power steam inlet isolation valve 4 be arranged on before power steam voltage-stablizer 6.
The ruuning situation of evacuation system for steam condenser of the present invention is as follows:
(1) exhaust steam after acting is discharged to condenser 2 by steam turbine 1, and condenser is by waste steam condensation, and condensed fluid collection is to hot well.Remaining not condensable gas needs to be discharged by the vapor injection vacuum pumping system arranged.
(2) Water-ring vacuum pump operation: need the large quantity of air of the inside to discharge before condenser 2 system puts into operation to set up vacuum environment, now need to run water ring vacuum pump 14.That opens condenser comes gas pipeline isolating valve 7, other valve closings.After the forvacuum of liquid-ring vacuum pump, steam turbine and condenser put into operation.
(3) steam jet ejector runs: open stram condenser exhaust isolating valve 9 in order, steam jet ejector air entry valve 5, steam jet ejector power steam inlet valve 4, the condensate liquid tapping valve 8 of stram condenser; , that closes condenser carrys out gas pipeline isolating valve 7.Put into operation steam jet ejector 11.
Power steam enters steam jet ejector 11 by voltage-stablizer 6 via steam jet ejector first entrance 111, forms supersonic airstream set up the gas that the suction of inner vacuum environment enters steam jet ejector second entrance 112 by the inwardly projecting orifice of steam jet ejector.Steam jet ejector second entrance 112 connects condenser, makes the not condensable gas of condenser constantly extract to maintain the vacuum of condenser out.Mist is discharged to stram condenser 12 by the first outlet 113 by steam jet ejector.Be provided with the automatic steam trap 19 of voltage-stablizer in the bottom of voltage-stablizer 6, the aqueous water be mingled with constantly discharged in power steam, aqueous water enters steam jet ejector 11 and damages internal motivation nozzle.
Stram condenser 12 runs: the mist cooling that cooling water will be discharged from steam jet ejector by the first entrance 121 stram condenser, and condensed water is back to hot well 4 by the 3rd outlet 124, recycles.Remaining a small amount of uncondensable gas is discharged through water ring vacuum pump by the second outlet 123, and cooling water is discharged to cooling water system by an outlet 122.
Water-ring vacuum pump operation: water ring vacuum pump 14 aspirates the non-condensable gas from stram condenser 12 by the first entrance 141, is discharged to air by gas by the first outlet 143 by the compression of water ring vacuum pump.The pressure transmitter 10 being arranged on water ring vacuum pump porch detects the change of vacuum pump inlet pressure, reflux gas is supplemented to Water-ring vacuum pump intake by the pressure-regulating valve 13 controlling the vacuum pump inlet on reflux pipeline 142, maintain water ring vacuum pump pressure of inspiration(Pi), avoid the too low damage causing water ring vacuum pump of pressure of inspiration(Pi).
The control point of pumped vacuum systems of the present invention is:
1) Stress control of power steam
Steam jet ejector system needs the steam providing steady pressure.The pressure transmitter 16 composition steam source of stable pressure system jointly of power steam voltage-stablizer 6, steam pressure control valve 15, power steam.The pressure change inside power steam voltage-stablizer 6 monitored by the pressure transmitter 16 of power steam, when internal pressure is higher than design pressure, the pressure transmitter 16 of power steam transmits a signal to DCS system, and DCS system output signal opens steam regulation pressure-regulating valve 15; Control by the aperture of steam regulation pressure-regulating valve 15 the power steam flow entering steam pressurizer 6, stablize the pressure of the power steam entering steam jet ejector with this.
2) condensate liquid is back to the Liquid level of condenser hotwell
Condensate liquid inside stram condenser needs to be back to condenser hotwell and recycles.Gas should be avoided in reflux pipeline to enter condenser hotwell and to destroy vacuum inside condenser, therefore need to arrange condensate liquid backflow control system.
Native system is provided with condensate liquid hydrophobic pipeline water seal 17, utilizes the water seal of certain altitude to enter condenser hotwell to avoid gas.In addition, native system arranges the automatic shutter of the condensate liquid tapping valve of liquid-level switch coordinating with steam rapid heat cycle condenser at condenser water leg place.When the liquid level in condenser reflux pipeline is increased to the liquid-level switch 18 set point place of condensate liquid pipeline, liquid-level switch sends a signal to DCS system, and DCS system output signal opens the condensate liquid tapping valve 8 of stram condenser; When the liquid level in condenser reflux pipeline falls the liquid-level switch 18 set-point place to condensate liquid pipeline after rise, liquid-level switch sends a signal to DCS system, the condensate liquid tapping valve 8 of DCS system output signal steam off condenser.The water seal having enough height inside condensate liquid reflux pipeline is guaranteed with this.
3) inlet pressure of water ring vacuum pump controls
Not condensable gas through steam jet ejector 11 and stram condenser 12 is discharged to air by the water ring vacuum pump 14 of afterbody.Owing to needing exerting oneself of water ring vacuum pump greatly to reduce, for avoiding the inlet pressure of water ring vacuum pump too low and causing cavitation phenomenons, need to provide reflux gas to provide the inlet pressure of water ring vacuum pump to Water-ring vacuum pump intake.
Native system is provided with the pressure transmitter 10 of vacuum pump inlet and the pressure-regulating valve 13 of vacuum pump inlet.The pressure of Water-ring vacuum pump intake monitored by the pressure transmitter 10 of vacuum pump inlet, when pressure transmits a signal to DCS system lower than during setting value, DCS system output signal opens the pressure-regulating valve 13 of vacuum pump inlet, control by the aperture of the pressure-regulating valve 13 of vacuum pump inlet the reflux gas flow entering water ring vacuum pump 14, carry out the pressure of stable Water-ring vacuum pump intake with this.
When above-mentioned steam jet ejector runs, i.e. step (3), its advantage is:
1. can maintain the most high vacuum of condenser, improve exerting oneself of condenser.
2. the ability vacuumized improves, and condenser vacuum improves, and reduces gross coal consumption rate.
3. safe, non-maintaining.Whole system no-rotary part, mechanical is worn and torn, exerting oneself and operation steady in a long-term of guarantee system 100%.
4. adopt steam jet ejector pumped vacuum systems, reduce electric cost.
With regard to pumped vacuum systems of the present invention, its beneficial effect is:
1. condenser vapor injection vacuum pumping system, the not condensable gas in the principle suction condenser adopting steam to spray, ensures the no minimum of condenser.
2. final stage exhaust liquid-ring vacuum pump arranges pressure backflow regulating system, guarantees that liquid-ring vacuum pump cavitation can not occur.
3. power steam voltage-stablizer, pressurizer system is by pressure transmitter, pressure-regulating valve, and voltage-stablizer forms.Realize stablizing injector inlet pressure, for steam jet ejector improves stable power, ensure that steam jet ejector is stable and exert oneself.
In addition, bottom pressure manostat, be provided with automatic steam trap, avoid the aqueous water be mingled with in power steam enter steam jet ejector and damage power jet.
Therefore, the technical scheme that the present invention proposes solves problems of the prior art.
It is evident that, those skilled in the art can make different modifications and variations to disclosed pumped vacuum systems.When considering description and the convention of pumped vacuum systems disclosed herein; those skilled in the art can obtain other embodiments apparently, such amendment, to change and other embodiments of obtaining still will be understood that and are included in protection scope of the present invention.It is understood that description and embodiment are only considered to exemplary, its real protection domain is defined by the claims.
Claims (3)
1., with pressure controlled plant condenser vapor injection vacuum pumping system, described pumped vacuum systems comprises:
Steam turbine (1), condenser (2), condenser hotwell (3), power steam voltage-stablizer (6), steam jet ejector (11), stram condenser (12), water ring vacuum pump (14), the condensate liquid tapping valve (8) of stram condenser, condensate liquid hydrophobic pipeline water seal (17), the liquid-level switch (18) of condensate liquid pipeline, the pressure-regulating valve (13) of Water-ring vacuum pump intake and the multiple control valve be arranged between above-mentioned all parts and pipeline,
The outlet of steam turbine (1) is connected with the entrance of condenser (2); First entrance (111) of steam jet ejector connects power steam voltage-stablizer (6), and the first outlet (113) of steam jet ejector connects stram condenser (12);
The outlet of condenser (2) is connected with second entrance (112) of steam jet ejector;
First entrance (121) of stram condenser connects cooling water inlet, first outlet (122) of stram condenser connects coolant outlet, second outlet (123) of stram condenser connects water ring vacuum pump (14), and the 3rd outlet (124) of stram condenser connects condenser hotwell (3);
First entrance (141) of water ring vacuum pump connects stram condenser second and exports (123), the first outlet (143) row air of water ring vacuum pump;
It is characterized in that:
On pipeline between steam inlet and first entrance (111) of steam jet ejector, be disposed with power steam inlet isolation valve (4), power steam pressure-regulating valve (15) and power steam voltage-stablizer (6);
On the pipeline (142) between first outlet (143) and first entrance (141) of water ring vacuum pump of water ring vacuum pump, be provided with the pressure-regulating valve (13) of Water-ring vacuum pump intake; On the pipeline between the 3rd outlet (124) and condenser hotwell (3) of stram condenser, be disposed with the condensate liquid tapping valve (8) of condensate liquid hydrophobic pipeline water seal (17) and stram condenser;
The liquid-level switch (18) of condensate liquid pipeline is provided with at the condenser water leg place of stram condenser (12);
The automatic shutter of the condensate liquid tapping valve (8) of described liquid-level switch (18) coordinating with steam rapid heat cycle condenser, wherein when the liquid level in condenser reflux pipeline is increased to liquid-level switch (18) the set point place of condensate liquid pipeline, liquid-level switch sends a signal to DCS system, and DCS system output signal opens the condensate liquid tapping valve (8) of stram condenser; When the liquid level in condenser reflux pipeline falls liquid-level switch (18) the set-point place to condensate liquid pipeline after rise, liquid-level switch sends a signal to DCS system, the condensate liquid tapping valve (8) of DCS system output signal steam off condenser;
Described power steam pressure-regulating valve (15) coordinates the pressure transmitter (16) of power steam automatically to regulate opening and closing;
The pressure-regulating valve (13) of described Water-ring vacuum pump intake coordinates pressure transmitter (10) automatically to regulate opening and closing;
Also comprise the pressure transmitter (16) of power steam control valve (15), power steam; Wherein
Pressure transmitter (16) the composition steam source of stable pressure system jointly of power steam voltage-stablizer (6), power steam pressure-regulating valve (15) and power steam;
The pressure change of pressure transmitter (16) monitoring power steam voltage-stablizer (6) the inside of power steam, when internal pressure is higher than design pressure, the pressure transmitter (16) of power steam transmits a signal to DCS system, and DCS system output signal is opened and regulated power steam pressure-regulating valve (15); The power steam flow entering steam pressurizer (6) is controlled by regulating the aperture of power steam pressure-regulating valve (15);
Described pumped vacuum systems also comprises the pressure transmitter (10) of Water-ring vacuum pump intake and the pressure-regulating valve (13) of Water-ring vacuum pump intake, the pressure of pressure transmitter (10) the monitoring Water-ring vacuum pump intake of vacuum pump inlet, when pressure transmits a signal to DCS system lower than during setting value, DCS system output signal opens the pressure-regulating valve (13) of vacuum pump inlet, controls by the aperture of the pressure-regulating valve (13) of vacuum pump inlet the reflux gas flow entering water ring vacuum pump (14).
2. pumped vacuum systems according to claim 1, is characterized in that:
Pipeline between the outlet and second entrance (112) of steam jet ejector (11) of condenser (2) is provided with the air entry valve (5) of steam jet ejector;
Pipeline between the outlet and first entrance (141) of water ring vacuum pump of condenser (2) is provided with condenser to bleed the isolating valve (7) of pipeline.
3. pumped vacuum systems according to claim 2, is characterized in that:
Described pumped vacuum systems also comprises the power steam inlet isolation valve (4) be arranged on before power steam voltage-stablizer (6).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410144155.2A CN103940256B (en) | 2014-04-11 | 2014-04-11 | With pressure controlled plant condenser vapor injection vacuum pumping system |
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| CN201410144155.2A CN103940256B (en) | 2014-04-11 | 2014-04-11 | With pressure controlled plant condenser vapor injection vacuum pumping system |
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