CN101625203A - Method for enhancing vacuum of steam condenser - Google Patents
Method for enhancing vacuum of steam condenser Download PDFInfo
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- CN101625203A CN101625203A CN200910114301A CN200910114301A CN101625203A CN 101625203 A CN101625203 A CN 101625203A CN 200910114301 A CN200910114301 A CN 200910114301A CN 200910114301 A CN200910114301 A CN 200910114301A CN 101625203 A CN101625203 A CN 101625203A
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Abstract
The invention discloses a method for enhancing vacuum of a steam condenser. A cooler is arranged on a pipeline between the steam condenser and a vacuum pump, a condensate water recovery and storage tank is installed at the gas side of the cooler, and the water storage tank is connected with a hot well of the steam condenser through a water seal. Only when temperature of the outlet of the cooler is kept at about 15 DEG C, the steam condenser vacuum can approach ultimate vacuum of the vacuum pump. In summer, if the installed cooler is put into operation, the steam condenser vacuum is enhanced to the ultimate vacuum of the vacuum pump with increase of about 2 kpa, therefore, by calculating according to that the steam condenser vacuum is enhanced by 1kpa, the coal consumption is lowered by 1.97g/kwh, and a machine set of 600 MW annually generates power for 300 days on average, the invention can save coals for 17020.8 t every year; and if the price of the coal is 500 yuan/t, the invention can save the generation cost for 8510400 yuan every year, thereby having remarkable economic benefit.
Description
Technical field
The present invention relates to power plant condensing steam turbine generator group condenser pumped vacuum systems.Specifically a kind of method that improves condenser vacuum.
Background technology
The quality of condensing steam turbine generator group condenser vacuum directly influences the economical operation of power plant steam turbine.The factor that influences condenser vacuum is a lot, and the water temperature that wherein is used for jetting formula vavuum pump jetting pond is exactly one of factor that influences condenser vacuum with the temperature that is used for the working water in the water-ring vacuum pump.It is constant that the technical staff in power plant (jetting formula vavuum pump) keeps jetting pond water temperature with the water in exchange jetting pond, thereby guarantee that condenser vacuum is constant; Water-ring vacuum pump guarantees the suction capactity of water-ring vacuum pump with the working water in (cooler) cooling vacuum pump, thereby it is constant to keep condenser vacuum, but these methods all can not change summer weather and coolant water temperature to the influence of vavuum pump suction capactity.Some power plant's attempt improves condenser vacuum with the working water in the central air-conditioning water cooling water-ring vacuum pump, but all undesirable.
Summary of the invention
The objective of the invention is to solve the influence of vavuum pump coolant water temperature and weather, thereby guarantee condenser vacuum the vavuum pump suction capactity.A kind of method of effective raising condenser vacuum is proposed.
The technical scheme that the present invention takes is:
To the pipeline between the vavuum pump, cooler is set at condenser.
Cooler before pumping into valve, vacuum is installed.
Cooler gas side is installed and is coagulated water recovery water tank, and water tank is connected with condenser hotwell by water seal.
When condensing turbine normally moved, its vacuum was cooled off in condenser after the volume-diminished by steam discharge and is formed, and by vavuum pump the gas that can not condense in the condenser steam discharge and leaked-in air suction was boosted to discharge afterwards and kept.In fact the vavuum pump that usefulness the is good again discharge of can not fully the gas pumping in the condenser being boosted, condenser can only be near the end vacuum of vavuum pump, can not reach theoretical vacuum forever, for the vacuum that reaches capacity, also to consider optimum vacuum, if condenser vacuum is uneconomic greater than optimum vacuum, the benefit that this part vacuum that promptly is used to improve produces is less than being used to improve the power that this part vacuum consumes.
End vacuum is an important parameter of vavuum pump, and its characterizes vavuum pump suction capactity, in case vavuum pump end vacuum design as requested after, environment temperature and coolant water temperature are low more good more.The end vacuum that is used for the water-ring vacuum pump of condensing steam turbine generator, during 15 ℃ of (winter) coolant water temperatures, end vacuum is (vacuum pump inlet pressure) 3.4kpa, and during 33 ℃ of (summer) coolant water temperatures, the end vacuum of vavuum pump is (vacuum pump inlet pressure) 11.8kpa.
Cooler is installed before vavuum pump (water-ring vacuum pump, jetting formula vavuum pump, other form vavuum pump) is gone into valve can be effectively improved condenser vacuum.
Vacuum pumps into preceding installation of valve can draw such conclusion after cooler puts into operation:
(1) gas temperature behind cooler descends, and the condensable part of the gas in the suction vavuum pump will be condensed in cooler in advance, has improved the suction capactity of vavuum pump.
(2) gas temperature behind cooler descends, and the gas density in the suction vavuum pump increases, and has improved the suction capactity of vavuum pump equally,
(3) gas temperature behind cooler descends, and according to gas equation R=PV/T as can be known, the cooler volume V is constant, and the pressure in the cooler will reduce, and the gas that can not condense and the leaked-in air that help in the condenser are arranged to cooler.Cooler is installed to be imagined with regard to the mechanism that is based on above three kinds of effects condenser vacuum is further enhanced.Vacuum pumps into also has following acting on after the preceding installation of valve cooler puts into operation: 1. be designed to about 15 ℃ owing to vacuum pumps into the temperature degree, correlation ability of swimming vavuum pump jetting pond water temperature has been cooling effect, therefore the jetting pond need not keep changing water, as long as keep ordinary water level; In like manner, also be cooling effect to the working water in the water-ring vacuum pump, therefore need not design cooler it is cooled off the working water in the water-ring vacuum pump.2. because the condensable of the gas in suction vavuum pump part will be condensed in advance,, save part working medium in cooler by reclaiming.3. because vacuum pumps into the temperature degree and is designed to about 15 ℃, guaranteed that vavuum pump has a good working environment, has prolonged the service life of vavuum pump.
Cooler is installed before vacuum pumps into valve can further be improved the vacuum in the condenser and not consume extra power, central air-conditioning water that cooler is used and open type water are that power plant itself is with regard to supporting cooling medium, enough supply with all users, therefore the cooling medium that is used as cooler with it is fine, and the power of consumption can be ignored.
The design principle that cooler is followed: design cooler for 15 ℃ according to this power plant central air-conditioning water pressure and temperature (10 ℃), about 40 ℃ of cooler inlet (gas side) and vavuum pump rate of air sucked in required, cooler outlet (gas side).
Useful effect of the present invention:
As long as the cooler of design and installation of the present invention can be kept cooler outlet temperature (gas side) about 15 ℃, condenser vacuum just might be near the end vacuum (3.4kpa) of vavuum pump (water-ring vacuum pump).In summer, after supposing that the installation cooler puts into operation, condenser vacuum is brought up to the end vacuum of vavuum pump, the raising amount is about 2kpa (summer and vacuum in winter result relatively), improve 1kpa according to condenser vacuum, coal consumption reduces 1.97g/kwh, a 600MW unit annual generating was calculated in 300 days, can save 17020.8 tons/year of coals (2*1.97*24*300*600000/1000000=17020.8t), by 500 yuan of/ton calculating, save cost of electricity-generating (17020.8*500=8510400 unit) 8510400 yuan/year.Economic benefit is remarkable especially.
The present invention is except effectively improving the condenser vacuum, and also have following effect: 1, the jetting pond of jetting formula vavuum pump need not keep changing water, as long as keep ordinary water level; Working water in the water-ring vacuum pump need not design cooler it is cooled off.2, recovery section working medium.3, vavuum pump has a good operation ring, has prolonged the service life of vavuum pump.
Description of drawings
Fig. 1 is a condensing steam turbine generator group condenser pumped vacuum systems schematic diagram commonly used at present.
Fig. 2 is the pumped vacuum systems schematic diagram after condensing steam turbine generator group condenser pumped vacuum systems of the present invention is installed cooler.
Fig. 3 is the cooler construction schematic diagram.
Shown in the figure: 1-condenser 2-cooler 3-water tank 4-water seal 5-water-ring vacuum pump 6-vacuum pumps into the water transfer of the laterally opened water backwater of the laterally opened water water inlet 9-cooler water of connecting pipe 8-cooler water between valve 7-condenser and vavuum pump 10-cooler water side central hollow water transfer water inlet 11-cooler water side central hollow and returns 12-cooler gas side-entrance 13-cooler gas side outlet 14-and be sidelong water valve 21-water tank inlet valve 22-water tank compensation flap 23-water tank air gate 24-water tank Draw off valve 25-water side air gate 26-cooler gas side-entrance Electrically operated gate 27-cooler gas side outlet Electrically operated gate 28-cooler gas side bypass Electrically operated gate to condenser hotwell 15-atmosphere 16-cooler gas side-entrance thermometer 17-cooler gas side outlet thermometer 18-cooler water side-entrance thermometer 19-cooler water side outlet thermometer 20-cooler water.
The specific embodiment
Fig. 1 is at present typical condensing steam turbine generator group condenser pumped vacuum systems, and this figure is the pumped vacuum systems of 300MW and 600MW unit, and the pumped vacuum systems of 200MW unit is only established two jetting formula vavuum pumps (summary).
Cooler of the present invention is installed the method for implementing:
As Fig. 2, Fig. 3 is installed in cooler 2 on the pipeline 7 between vavuum pump 5 and the condenser 1, and pumps into valve 6 near vacuum as far as possible.Cooler gas side-entrance 12 is connected on the condenser vacuum lead 7; Cooler gas side goes out 13 and is connected vacuum and pumps on the valve preceding pipeline; Cooler gas side is imported and exported 12,13 Electrically operated gate 26,27 and bypass Electrically operated gate 28 is installed; Cooler gas side is installed and is coagulated water recovery water tank 3, and water tank is connected with condenser hotwell 14 by water seal 4; The laterally opened water of cooler water water inlet 8 is connected open type water and intakes on female pipe, and cooler water side central air-conditioning water water inlet 10 is connected central air-conditioning water and intakes on female pipe; The laterally opened water backwater 9 of cooler water is connected on the female pipe of open type water backwater, and cooler water side central air-conditioning water returns 11 and is connected on the female pipe of central air-conditioning water backwater; Cooler water side is equipped with wicket 20 and air gate 25; Cooler gas side is imported and exported, the water side is imported and exported thermometer 16,17,18,19 all is installed.
If many pumped vacuum systems that vavuum pump is arranged side by side, cooler 2 is installed on the female pipe 7 of gas and as far as possible near vavuum pump 5.
About 15 ℃ of the cooler of design and installation (gas side) back temperature, about 10 ℃ of central air-conditioning coolant-temperature gages.The operating procedure that cooler drops into: as Fig. 3,1. open cooler gas side front and back electrically operated valve 26,27, close cooler gas side bypass door 28,2. close cooler water and be sidelong water valve 20, close behind cooler water side air gate 25 water breakthroughs, 3. open cooler water side central air-conditioning water turnover water valve 10 summer, 11, close the laterally opened water turnover of cooler water water valve 8,9,4. open the laterally opened water turnover of cooler water water valve 8 winter, 9, close cooler water side central air-conditioning water turnover water valve 10,11,5. close water tank air gate 23,6. close water tank gas and be sidelong penstock 24,7. open water tank compensation flap 22,8. open water tank inlet valve 21, end of operation.
Attention: before dropping into central air-conditioning water, earlier the water in the cooler water side to be drained and can drop into, because central air-conditioning water is handled through desalination.
The cooler course of work that puts into operation:
After the gas that pumps out from condenser 1 entered cooler 2 coolings by pipeline 7, temperature dropped to 15 ℃, pumped into valve 6 by vacuum and entered vavuum pump 5 suctions and boost and enter atmosphere 15, can coagulate part and put back to condenser hotwell after water tank 3 reclaims.
The operating procedure that water tank discharges water:
As Fig. 3,1. after water tank has 2/3 above water level, it is discharged water, 2. close water tank inlet valve 21,3. close water tank compensation flap 22,4. open water tank Draw off valve 24,5. open water tank air gate 23, see that water tank closes after anhydrous, 6. close water tank Draw off valve 24,7. open water tank compensation flap 22,8. open water tank inlet valve 21, end of operation.
Cooler completely cuts off the inspection operation step: 1. open cooler gas side bypass door 28,2. close cooler gas side front and back electrically operated valve 26,27,3. close cooler water side turnover water valve 8,9,10,11,4. open cooler water and be sidelong water valve 20,5. open cooler water side air gate 25,6. close wicket 24, end of operation after water tank water being drained.
Claims (3)
1, a kind of method that improves condenser vacuum is characterized in that: to the pipeline between the vavuum pump (5) cooler (2) is set at condenser (1).
2, the method for raising condenser vacuum according to claim 1 is characterized in that: cooler (2) is installed before vavuum pump (5) is gone into valve.
3, the method for raising condenser vacuum according to claim 1 is characterized in that: cooler (2) gas side is installed and is coagulated water recovery water tank (3), and water tank is connected with condenser hotwell (14) by water seal (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910114301A CN101625203A (en) | 2009-08-11 | 2009-08-11 | Method for enhancing vacuum of steam condenser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910114301A CN101625203A (en) | 2009-08-11 | 2009-08-11 | Method for enhancing vacuum of steam condenser |
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| CN101625203A true CN101625203A (en) | 2010-01-13 |
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| CN200910114301A Pending CN101625203A (en) | 2009-08-11 | 2009-08-11 | Method for enhancing vacuum of steam condenser |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103047876A (en) * | 2013-01-05 | 2013-04-17 | 深圳市博众节能工程技术有限公司 | Device and method for maintaining vacuum of steam condenser of thermal power plant |
| CN103267425A (en) * | 2013-05-30 | 2013-08-28 | 深圳市广前电力有限公司 | Method and device for solving condenser low vacuum in combined cycle unit starting process |
| CN103776275A (en) * | 2014-02-21 | 2014-05-07 | 程晋瑞 | Improved condenser vacuum system |
| CN104515409A (en) * | 2014-12-25 | 2015-04-15 | 梁双印 | Device for improving vacuum of thermal power generating unit |
| CN106052414A (en) * | 2016-06-28 | 2016-10-26 | 中广核工程有限公司 | Condenser vacuum-pumping system and method |
| CN111181487A (en) * | 2019-12-30 | 2020-05-19 | 湖北同方高科泵业有限公司 | Solar photovoltaic photo-thermal integrated heating system |
-
2009
- 2009-08-11 CN CN200910114301A patent/CN101625203A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103047876A (en) * | 2013-01-05 | 2013-04-17 | 深圳市博众节能工程技术有限公司 | Device and method for maintaining vacuum of steam condenser of thermal power plant |
| CN103047876B (en) * | 2013-01-05 | 2016-05-11 | 深圳市博众节能工程技术有限公司 | Maintain the devices and methods therefor of thermal power plant condenser vacuum |
| CN103267425A (en) * | 2013-05-30 | 2013-08-28 | 深圳市广前电力有限公司 | Method and device for solving condenser low vacuum in combined cycle unit starting process |
| CN103267425B (en) * | 2013-05-30 | 2015-05-13 | 深圳市广前电力有限公司 | Method and device for solving condenser low vacuum in combined cycle unit starting process |
| CN103776275A (en) * | 2014-02-21 | 2014-05-07 | 程晋瑞 | Improved condenser vacuum system |
| CN104515409A (en) * | 2014-12-25 | 2015-04-15 | 梁双印 | Device for improving vacuum of thermal power generating unit |
| CN104515409B (en) * | 2014-12-25 | 2017-07-07 | 梁双印 | A kind of device for improving fired power generating unit vacuum |
| CN106052414A (en) * | 2016-06-28 | 2016-10-26 | 中广核工程有限公司 | Condenser vacuum-pumping system and method |
| CN106052414B (en) * | 2016-06-28 | 2018-05-29 | 中广核工程有限公司 | Evacuation system for steam condenser and condenser vacuum pumping method |
| CN111181487A (en) * | 2019-12-30 | 2020-05-19 | 湖北同方高科泵业有限公司 | Solar photovoltaic photo-thermal integrated heating system |
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Open date: 20100113 |