CN203796595U - Air ejector control system in water ring vacuum pump unit - Google Patents
Air ejector control system in water ring vacuum pump unit Download PDFInfo
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- CN203796595U CN203796595U CN201420156440.1U CN201420156440U CN203796595U CN 203796595 U CN203796595 U CN 203796595U CN 201420156440 U CN201420156440 U CN 201420156440U CN 203796595 U CN203796595 U CN 203796595U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 52
- 239000003380 propellant Substances 0.000 claims description 18
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000007704 transition Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000012224 working solution Substances 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000001413 cellular effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000008398 formation water Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
The utility model belongs to the field of vacuum equipment and particularly relates to an air ejector control system in a water ring vacuum pump unit. The air ejector control system comprises a DCS (distributed control system), a pressure sensor, a temperature sensor, an air circuit bypass valve and an air driving valve. The pressure sensor is arranged on a suction pipeline of the water ring vacuum pump unit, the temperature sensor is arranged on an operation water pipeline of the water ring vacuum pump unit, signals of the pressure sensor and the temperature sensor are inputted into the DCS, the air circuit bypass valve is arranged on a pipeline in parallel connection with an air ejector, the air driving valve is arranged on an air driving inlet pipeline of the air ejector, and the air circuit bypass valve and the air driving valve are both connected with the DCS. The air ejector control system in the water ring vacuum pump unit has the advantages that input and withdraw occasions of the air ejector can be controlled accurately, and accordingly cavitation and vacuum breaking of a vacuumized system can be avoided effectively to enable high efficiency and stability in operation of the unit system.
Description
Technical field
The utility model belongs to vacuum equipment field, is specifically related to the vacuum pump control system in Water-ring vacuum pump assembly.
Background technique
Power plant generally all adopts liquid ring vacuum pump assembly as the vaccum-pumping equipment of vapour condenser at present.The vacuum of vapour condenser is higher, and the generating efficiency of power plant is just higher, so water-ring pump is all in the lower operation of limiting vacuum (the limiting vacuum here can reach while referring to water-ring pump work high vacuum).Because liquid-ring vacuum pump adopts water as working solution, so liquid-ring vacuum pump moves under limiting vacuum, will there is cavitation.Cavitation is a kind of physical phenomenon.At a certain temperature, suction working area at water-ring pump, pressure is low, and to certain degree, the gas that some is dissolved in working solution will be separated out from pendular ring, and, pressure lower (or more close to the saturation vapour pressure of pendular ring time), the bubble of separating out from pendular ring is more, and speed is faster, when suction pressure reaches the saturation vapour pressure of pendular ring, pendular ring is in fluidized state, and the rate of air sucked in required of water-ring pump will be zero.From the suction working area of water-ring pump to discharging working area, due to the increase gradually of pressure, the bubble of separating out from suction working area pendular ring sharply dwindles, so that break.When gross blowhole breaks, liquid particle will be filled the hole producing when bubble breaks at high speed, occur mutually to clash into and formation water attack.The frequency of this water attack is up to 2500Hz, and pressure is up to 49MPa, to making blade surface occur pit, when serious, can make the metal peeling of blade surface and forms cellular.Cavitation damage except the effect of mechanical force also with the effect of the Various Complexes such as electrolysis, chemical corrosion.The cavitation scene of liquid-ring vacuum pump is that exhaust capacity declines rapidly, produces very large noise, vibration, and impeller damages very soon.Can fundamentally avoid the method for liquid-ring vacuum pump cavitation before liquid-ring vacuum pump, to increase exactly vacuum pump, by vacuum pump, gas is carried out after certain compression, enter liquid-ring vacuum pump, liquid ring vacuum pump inlet pressure has improved again, and cavitation just can have been avoided.And vacuum pump also has the ability that further improves condenser vacuum, so increasing power plant all adopts the unit of vacuum pump+liquid-ring vacuum pump, the said Water-ring vacuum pump assembly of the present invention refers to the assembly of all parts such as water ring vaccum pump+vacuum pump+moisture trap+heat exchanger.
The advantage of vacuum pump only embodies when high vacuum, and in the time of rough vacuum, exhaust capacity is not separately used liquid-ring vacuum pump not good, thus control well vacuum pump input and withdraw from guarantee unit and efficiently move.In the prior art, be by unit suction port dress pressure switch, set two force value and control vacuum pump.Bring thus following shortcoming: because cavitation erosion is relevant with the working water temperature of water ring vaccum pump, under the higher operating mode of the water temperatures such as summer, according to pressure setting, do not drop into vacuum pump, but there is cavitation in liquid-ring vacuum pump, vibration, noise aggravate, and have greatly shortened the working life of liquid-ring vacuum pump; On the contrary, under the operating mode that in the winter time etc. water temperature is lower, reality cavitates, but has dropped into vacuum pump, and complete equipment exhaust capacity is declined, and causes condenser vacuum to decline, and increases cost of electricity-generating; And air-extractor exhaust capacity changes greatly when this method is switched, and then affect the stability of vapour condenser and steam turbine operation.Above-mentioned situation occurs too in the technological process of pharmacy, chemical industry etc. high vacuum.
Model utility content
Technical problem to be solved in the utility model is, for the deficiencies in the prior art, provides a kind of can effectively controlling the input of vacuum pump and withdrawing from the control system on opportunity of high vacuum industry vacuum pump unit that be applicable to.
Technical problem to be solved in the utility model is achieved by the following technical solution:
Vacuum pump control system in a kind of Water-ring vacuum pump assembly, comprise that Distributed Control System is called for short DCS, pressure transducer, temperature transducer, gas circuit bypass valve, propellant valve, wherein pressure transducer is arranged on the exhaust pipe of Water-ring vacuum pump assembly, temperature transducer is arranged on the working water pipeline of water ring vaccum pump, the signal input DCS of pressure transducer and temperature transducer, gas circuit bypass valve is arranged on the pipeline in parallel with vacuum pump, propellant valve is arranged on the propellant entrance pipe of vacuum pump, gas circuit bypass valve and propellant valve all access DCS.
Particularly, described vacuum pump is connected with the air outlet of steam-water separator in Water-ring vacuum pump assembly by propellant entrance pipe, and the working water pipeline of described water ring vaccum pump is connected with the water outlet of steam-water separator.Described temperature transducer is arranged on the heat exchanger entrance place on the working water pipeline of water ring vaccum pump.
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Accompanying drawing explanation
Fig. 1 is the utility model embodiment's system construction drawing.
Fig. 2 is vacuum pump control system block diagram of the present utility model.
Fig. 3 is the functional relation plotted curve that model utility is controlled parameter.
Embodiment
Fig. 1 is Water-ring vacuum pump assembly of the present utility model and vacuum pump control system schematic diagram thereof.
As shown in the figure, from the gas being come by the system of taking out, pass through successively entrance main valve 1, vacuum pump 2, water ring vaccum pump 3, then enters moisture trap 4.Between vacuum pump 2 and water ring vaccum pump 3, bypass valve 5 is housed, between vacuum pump 2 and moisture trap 4, propellant valve 6 is housed.When bypass valve 5 cuts out, when simultaneously propellant valve 6 is opened, enter water ring vaccum pump 3 after making gas in moisture trap 4 by vacuum pump 2 compressions, now vacuum pump 2 is devoted oneself to work.When bypass valve 5 is opened, when propellant valve 6 cuts out simultaneously, now vacuum pump 2 is withdrawn from work, and the gas being come by the system of taking out directly enters water ring vaccum pump 3.The air-water mixture of discharging from water ring vaccum pump 3 is after moisture trap 4 separation, and gas is discharged from top vent, and water is collected after over-heat-exchanger 7 is cooling in bottom, comes back to liquid-ring vacuum pump 3 and recycles.Unit entrance is equipped with pressure transducer 8, for measuring by the pressure P of the system of taking out, moisture trap 4 is equipped with temperature transducer 9 to the pipeline between heat exchanger 7, measurement be that the water temperature t that liquid-ring vacuum pump 3 ejects is the work water temperature in liquid-ring vacuum pump 3 pump housings.The numerical value of pressure transducer 8 and temperature transducer 9, by DCS logical operation, then, by controlling the opening and closing state of bypass valve 5 and propellant valve 6, is realized and is dropped into accurately and withdraw from vacuum pump 2.
Fig. 2 is vacuum pump control system block diagram of the present utility model, as shown in the figure, comprise that Distributed Control System (Distributed Control System) is called for short DCS, pressure transducer, temperature transducer, gas circuit bypass valve, propellant valve, described pressure transducer and temperature sensing actuator temperature are inputted DCS by measured signal, and described gas circuit bypass valve and propellant valve all access DCS.
Vacuum pump control system is moved as follows:
(1) temperature transducer will be taken out system pressure measured value P input DCS by working water temperature measured value t, pressure transducer, DCS carries out the functional relation of working water temperature measured value t substitution P1, P2 and P3 and t to draw calculation of pressure value P1, P2 and P3 after computing, then compared taking out the pressure measured value P of system and calculation of pressure value P1, P2 and P3;
(2) when P≤P2, close gas circuit bypass valve, open propellant valve, vacuum pump is dropped into and bleed;
(3) when P >=P3, open gas circuit bypass valve, close propellant valve, vacuum pump is withdrawn from and bled.
Fig. 3 is the functional relation plotted curve that model utility is controlled parameter.
As shown in the figure, in Fig. 3, abscissa is working water temperature t value, is the measured numerical value of temperature transducer 9 in Fig. 1.In Fig. 3, y coordinate is suction pressure P value (unit of P is hPa, after add abs represent absolute pressure), is the measured numerical value of pressure transducer 8 in Fig. 1.This plotted curve is to draw by repetitious test and on-the-spot use experience.
In Fig. 3, always have 3 curves, be divided into 3 regions, the region of curve below 2 is vacuum pump working zone, and more than 3 region of curve is water-ring pump working zone, and the region between curve 2 and curve 3 is transition region.
Curve 1 is liquid-ring vacuum pump cavitation curve, and functional relation is P1=F (t), that is to say, when liquid-ring vacuum pump is worked with lower area (being P≤P1) at this curve, cavitation will occur.
Curve 2 is that vacuum pump drops into curve, and relation is that P2=F (t)+k1(k1 is a constant), when P≤P2, will drop into vacuum pump.K1 is the value providing according to test experience, is equivalent to a safe clearance, drops into vacuum pump in the time of can not waiting until P=P1 again.
Curve 3 is that vacuum pump is withdrawn from curve, and relation is that P3=F (t)+k2(k2 is a constant), when P >=P3, will withdraw from vacuum pump.According to experiment, when when being taken out system pressure P >=P3, the exhaust capacity of water ring pump is greater than the exhaust capacity of vacuum pump, so will withdraw from vacuum pump, makes by the maintenance of the system of the taking out low pressure of trying one's best.Meanwhile, K2 has buffer function, because if only have P2=F(t)+k1, when the pressure P of being taken out system fluctuates back and forth in P2 value left and right, DCS will constantly order and drop into and withdraw from vacuum pump.
In Fig. 3, the region of curve below 2 is vacuum pump working zone, can effectively avoid cavitation erosion, and the exhaust capacity of vacuum pump is stronger than liquid-ring vacuum pump in this region, drops into the better effects if of vacuum pump.More than 3 region of curve is water-ring pump working zone, a little less than the exhaust capacity of this regional atmospheric sparger is than liquid-ring vacuum pump, and the better effects if that does not drop into vacuum pump.Region between curve 2 and curve 3 is transition region, suitable at exhaust capacity and the liquid-ring vacuum pump of this regional atmospheric sparger, and now vacuum pump can be thrown and can not throw.
Control system of the present utility model, can realize and control exactly the input of vacuum pump and withdraw from opportunity, as shown in three of Fig. 3 curves, when working water temperature is 33 ℃, correspondingly, the water ring pump cavitation point relevant pressure of curve 1 is 58.3hPa, and it is 63.3hPa that the vacuum pump of curve 2 drops into some relevant pressure, and the point pressure of withdrawing from of curve 3 is 83.3hPa; And when working water temperature is 15 ℃, response curve 1 water ring pump cavitation point pressure is 26.2hPa, it is 31.2hPa that curve 2 vacuum pumps drop into point pressure, and the point pressure of withdrawing from of curve 3 is 51.2hPa.
If pressure switch is only set and two force value are controlled vacuum pump by prior art, as set, taken out system pressure and when 70hPaA, withdrawn from vacuum pump, when being 33 ℃, working solution temperature withdraws from vacuum pump by this pressure setting, because being drops on transition region, so no problem, but if water temperature is when being 15 ℃, 70hPaA withdraws from a 51.2hPa higher than vacuum pump, dropped on water ring pump working zone, therefore be should not withdraw from vacuum pump by 70hPaA pressure setting, and should when being greater than 51.2hPa, withdraw from vacuum pump.On the contrary, if setting is taken out system pressure and dropped into vacuum pump when 40hPa, when being 15 ℃, coolant-temperature gage drops into vacuum pump by setup pressure value no problem, because be, drop on transition region, if but water temperature is when being 33 ℃,, lower than water ring pump cavitation point 58.3hPa, can there is serious cavitation in 40hPaA, therefore should be taken out when system pressure is greater than 58.3hPa and be dropped into vacuum pump at quilt, and should do not dropped into vacuum pump by 40hPaA.
In a word, control system of the present utility model can realize to be controlled exactly the input of vacuum pump and withdraws from opportunity, before liquid-ring vacuum pump cavitation, drop into vacuum pump, effectively avoid the generation of cavitation, and improve the exhaust capacity of unit, and withdraw from vacuum pump in a little less than vacuum pump exhaust capacity is than liquid-ring vacuum pump, avoid causing that being taken out system vacuum declines, make a whole set of machine assembly air-exhausting ability all the time in high state, guarantee system stable operation.The utility model is applicable to high vacuum industry, particularly the vapour condenser of power plant is vacuumized, and can improve the generating efficiency of power plant, guarantees power plant's efficient stable operation.
Claims (3)
1. the vacuum pump control system in a Water-ring vacuum pump assembly, it is characterized in that, comprise that Distributed Control System is called for short DCS, pressure transducer, temperature transducer, gas circuit bypass valve, propellant valve, described pressure transducer is arranged on the exhaust pipe of Water-ring vacuum pump assembly, described temperature transducer is arranged on the working water pipeline of water ring vaccum pump, described pressure transducer and the signal of temperature transducer input DCS, described gas circuit bypass valve is arranged on the pipeline in parallel with vacuum pump, described propellant valve is arranged on the propellant entrance pipe of vacuum pump, described gas circuit bypass valve and propellant valve all access DCS.
2. the vacuum pump control system in Water-ring vacuum pump assembly according to claim 1, it is characterized in that, described vacuum pump is connected with the air outlet of steam-water separator in Water-ring vacuum pump assembly by propellant entrance pipe, and the working water pipeline of described water ring vaccum pump is connected with the water outlet of steam-water separator.
3. the vacuum pump control system in Water-ring vacuum pump assembly according to claim 1, is characterized in that, described temperature transducer is arranged on the heat exchanger entrance place on the working water pipeline of water ring vaccum pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420156440.1U CN203796595U (en) | 2014-04-01 | 2014-04-01 | Air ejector control system in water ring vacuum pump unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420156440.1U CN203796595U (en) | 2014-04-01 | 2014-04-01 | Air ejector control system in water ring vacuum pump unit |
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| CN203796595U true CN203796595U (en) | 2014-08-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420156440.1U Expired - Lifetime CN203796595U (en) | 2014-04-01 | 2014-04-01 | Air ejector control system in water ring vacuum pump unit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103939373A (en) * | 2014-04-01 | 2014-07-23 | 广东省佛山水泵厂有限公司 | Atmosphere ejector control system in water ring vacuum pump unit and atmosphere ejector control method |
| CN104835543A (en) * | 2015-01-14 | 2015-08-12 | 上海核工程研究设计院 | Nuclear power plant reactor coolant system ejector test system |
| CN107179007A (en) * | 2017-06-19 | 2017-09-19 | 大唐东北电力试验研究所有限公司 | A kind of thermal power plant vacuumizes ammoniacal liquor recovery system and method |
| CN107559200A (en) * | 2017-11-01 | 2018-01-09 | 广东肯富来泵业股份有限公司 | Balanced type Roots vacuum pumping system and its control method |
-
2014
- 2014-04-01 CN CN201420156440.1U patent/CN203796595U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103939373A (en) * | 2014-04-01 | 2014-07-23 | 广东省佛山水泵厂有限公司 | Atmosphere ejector control system in water ring vacuum pump unit and atmosphere ejector control method |
| WO2015149548A1 (en) * | 2014-04-01 | 2015-10-08 | 广东省佛山水泵厂有限公司 | Control system and method for air ejector in water ring vacuum pump unit |
| CN103939373B (en) * | 2014-04-01 | 2016-01-20 | 广东省佛山水泵厂有限公司 | The controlling method of the vacuum pump control system in a kind of Water-ring vacuum pump assembly |
| CN104835543A (en) * | 2015-01-14 | 2015-08-12 | 上海核工程研究设计院 | Nuclear power plant reactor coolant system ejector test system |
| CN104835543B (en) * | 2015-01-14 | 2017-05-31 | 上海核工程研究设计院 | A kind of nuclear power plant reactor coolant system injector testing system |
| CN107179007A (en) * | 2017-06-19 | 2017-09-19 | 大唐东北电力试验研究所有限公司 | A kind of thermal power plant vacuumizes ammoniacal liquor recovery system and method |
| CN107559200A (en) * | 2017-11-01 | 2018-01-09 | 广东肯富来泵业股份有限公司 | Balanced type Roots vacuum pumping system and its control method |
| CN107559200B (en) * | 2017-11-01 | 2024-06-14 | 广东肯富来泵业股份有限公司 | Balanced Roots vacuum pump system and control method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 528000 Guangdong Province, Foshan city Chancheng District River Road No. 14 Patentee after: GUANGDONG KENFLO PUMP Co.,Ltd. Address before: 528000 Guangdong Province, Foshan city Chancheng District River Road No. 14 Patentee before: GUANGDONG FOSHAN PUMP FACTORY Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140827 |