CN102278299A - Deep frequency conversion system of condensate pump of power station - Google Patents
Deep frequency conversion system of condensate pump of power station Download PDFInfo
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- CN102278299A CN102278299A CN2011101442373A CN201110144237A CN102278299A CN 102278299 A CN102278299 A CN 102278299A CN 2011101442373 A CN2011101442373 A CN 2011101442373A CN 201110144237 A CN201110144237 A CN 201110144237A CN 102278299 A CN102278299 A CN 102278299A
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Abstract
The invention relates to a deep frequency conversion system of a condensate pump of a power station, which is mainly used for pressurizing condensate water of a thermal power station and then used for other numerous users. The deep frequency conversion system comprises a sealing water system and a condensate water header, wherein an inlet pipeline is arranged on a pipeline of the condensate water header, a boosting pump is arranged on the inlet pipeline, a recirculating loop is arranged at an outlet of the inlet pipeline, a pipeline of a recirculating loop is connected to the condensate water header, and an outlet pipeline is connected with the sealing water system and user branches. According to the invention, the pressure from the outlet header of the condensate water pump to the sealing water of a feed pump is boosted, so that the rotating speed of the condensate water pump can also be reduced when a power generating set bears over 50 percent of load, and the effect of remarkably saving energy is achieved. Meanwhile, a water level adjusting valve of a deaerator is in a fully-opened state when the power generating set bears over 50 percent of load, the water level of the deaerator can be controlled only by the condensate water pump from double variable to single variable, and therefore the adjusting quality of water level control is greatly improved, and stable running of the set is facilitated.
Description
Technical field
The present invention relates to a kind of frequency conversion system, relate in particular to a kind of power station condensate pump degree of depth frequency conversion system, belong to the pipeline fluid supercharging technology, be used for other numerous users after being mainly used in the Thermal Power Station's water of condensation supercharging that comprises thermal power plant and nuclear power station.The user of most critical is desuperheat and the valve seal water system on Sealing Water for Feedwater Pump, the steam pipework.
Background technique
Power industry is the important foundation industry of Chinese national economy, and coal-fired thermal power generation corporations are enterprises that electric power energy is provided for social development and economic development, also are the industries that consumes primary energy and water resources in a large number simultaneously.Along with the development of China and global economy, the energy and environmental protection situation in recent years, some new variations have also appearred in the situation that thermal power generation corporations face at present.
Energy-saving and emission-reduction have promoted the restrictive index into the thermoelectricity enterprise development." the energy development Eleventh Five-Year Plan outline " of the State Council issue proposed energy-conservation and reduced discharging two restrictive targets.Aspect energy-conservation, planning proposes, and will reduce by 20% to ten thousand yuan of GDP energy consumptions of China in 2010; Primary energy total quantity consumed control target is about 2,700,000,000 tons of standard coals; Average annual growth by 4%; Aspect reduction of discharging, to reduce 8,400,000 tons of sulfur dioxide of discharging, 3.6 hundred million tons of carbon dioxide by 2010.
Power industry is one of major fields of energy-saving and emission-reduction, be that average net coal consumption rate to national thermal power generation corporations in 2010 reduces 15g/kWh to the requirement of thermal power generation industry in the planning, promptly be reduced to 355 g/kWh by 370 g/kWh in 2005, station service power consumption rate drops to 4.5%.According to statistics, the average net coal consumption rate of national 600MW capacitance grade unit in 2005 is 328.2g/kWh, and the average net coal consumption rate of national 600MW capacitance grade unit in 2006 is 325.7g/kWh.
The electric weight scheduling of thermal power generation corporations progressively is adjusted into energy-saving distribution by the nameplate scheduling.In August, 2007, the State Council has been write instructions and transfer " the energy-saving power generation dispatching way " formulated by the Committee of Development and Reform, Environmental Protection Administration, Electricity Monitoring Commission, the Eergy Office, sorts from low to high according to the unit energy consumption level, carries out the electric weight scheduling.Electricity power enterprise wants to keep good advantages for development in fierce competitive market, just must adopt an effective measure, and reduces the net coal consumption rate level of unit significantly.
Domestic and international coal price continuous rise, the operated pressure of thermal power generation corporations increases suddenly.In recent years, international, domestic coal price rises violently.Because the coal cost occupies the major component of thermal power plant's cost of production, promote under the little situation of amplitude in sales rate of electricity, the profit margin of electricity power enterprise will more and more be squeezed.Especially along with planning progressively integrating with of electric coal and market coal price lattice, thermal power generation corporations will face more severe operated pressure.
Further in-depth along with China's electric Power Reform, the reliability and the Economy that how constantly to reduce cost of electricity-generating, improve the performance of enterprises and unit operation have become the key subjects that electricity power enterprise faces at present, and unit to save energy and reduce the cost be a key link in this problem.In the face of country's energy-conservation and environmental requirement more and more higher, must on the key equipment of unit, carry out a large amount of retrofit works, in the hope of improving the Economy of unit operation to thermal power generation.Because the high voltage converter technology is day by day ripe, increasing thermal power generation corporations have carried out the frequency conversion transformation to the station-service high-voltage motor, change original constant speed pump (blower fan) into variable speed pump, change its performance curve, make its outlet pressure, flow and energy consumption of electrical machinery reach optimum Match, reach energy saving purposes.The condensate pump frequency conversion is exactly important frequency conversion retrofit work wherein, by RHVC, can make condensate pump be in optimal operational condition.
Condensate pump is the important motivity equipment of condensate system, and it boosts the water of condensation in the condenser hotwell, sends into oxygen-eliminating device after the low-pressure heater heating.Consider the needs of rugged environment and unit maximum load during the condensate pump Selection and Design, leave enough design capacities.Under the overall background of national energy-saving and emission-reduction, by utilizing existing condensate pump frequency conversion equipment, optimize condensate pump VFC strategy, seek optimum condensate pump frequency conversion effect, thereby reach energy-saving and emission-reduction, reduce cost of electricity-generating, improve the business economic benefit and become the target that each power station is pursued.
Before the condensate pump frequency conversion is transformed, the condensate pump power frequency operation, deaerator level is controlled by the aperture of deaerator level control valve.This regulating method just changes the circulating resistance of system, thereby changes the acceptable operating point of condensate pump, and the not bigger change of the output power of motor, the restriction loss of valve is quite big, and the condensate pump operational efficiency is very low.Therefore during the condensate pump power frequency operation, generally all depart from economical operating condition, depart from farther during unit band portion load.
Summary of the invention
The present invention is directed to above-mentioned problems of the prior art, a kind of power station condensate pump degree of depth frequency conversion system is provided, solved the problem that the condensate pump operational efficiency is low in the prior art, power consumption is big, and the present invention improves the regulation quality of generator set, promoted the stable operation of unit.
Technological scheme of the present invention is as follows:
Comprise seal water system and condense the jellyfish pipe, condense and draw an inlet ductwork on the pipeline of jellyfish pipe, inlet ductwork is provided with suction booster, the import separating valve is arranged on and condenses between jellyfish pipe and the suction booster, the outlet port of inlet ductwork is provided with the recirculation circuit in order to the outlet pressure of regulating suction booster, the pipeline of recirculation circuit is connected on the jellyfish pipe that condenses, and the suction booster outlet is provided with safety check and outlet separating valve successively, and export pipeline connects seal water system and user's branch road.
The hydrodynamic pressure transmitter is housed on described inlet ductwork and the export pipeline.
Described user's branch road is provided with separating valve and safety check.
Described suction booster and inlet/outlet separating valve are electronic.
Described outlet pressure modulating valve is a pneumatic valve, and the outlet pressure modulating valve is arranged on the recirculation circuit.
Advantageous effect of the present invention is as follows:
The present invention is on the basis of original system, increase by a cover sealing water-pressurization system, two cover systems unperturbed mutually switch, after new system puts into operation, can solve the several responsible consumers of condensate system---give pump seal water, steam pipework cooling water pressure and valve seal water system demand, thereby condensate pump energy-saving and frequency-variable effect is further promoted.
The present invention can select suitable pressurization system according to detected each user's of water of condensation water consumption and pressure demand, and the adjusting that valve is used for the isolation of new system, pressurized water flow and outlet pressure is set.Condensate pump is exported female pipe to the pressure of Sealing Water for Feedwater Pump to be promoted to satisfy feed water pump and other users' needs, make condensate pump when generator set 50% load is above, its rotating speed can also reduce, all energy-saving potentials of condensate pump are all brought into play, obtained obvious energy-saving effect more.
Simultaneously, by revising the control logic program of Power Plant DCS middle part segregation junction water system, make deaerator level control valve be higher than at 50% o'clock at the generator set load, get final product manual standard-sized sheet, the water level of oxygen-eliminating device is fully by the condensate pump Frequency Converter Control, become single argument control from original water level control by condensate pump frequency variator and the control of deaerator level control valve bivariate, improve the regulation quality of generator set system, promote the stable operation of unit.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Among the figure, 1, condensate pump, 2, the jellyfish that condenses pipe, 3, the sealing water lines, 4, the import separating valve, 5, suction booster, 6, the outlet separating valve, 7, the outlet pressure modulating valve, 8, seal water system, 9, user's branch road.
Embodiment
The present invention in conjunction with specific embodiments, is described in detail as follows with reference to accompanying drawing.
Embodiment
Comprise seal water system 8 and condense jellyfish pipe 2, draw an inlet ductwork on the pipeline of the jellyfish that condenses pipe 2, inlet ductwork is provided with suction booster 5, import separating valve 4 is arranged on and condenses between jellyfish pipe 2 and the suction booster 5, the outlet port of inlet ductwork is provided with the recirculation circuit in order to the outlet pressure of regulating suction booster, the pipeline of recirculation circuit is connected on the jellyfish pipe 2 that condenses, suction booster 5 outlets are provided with safety check and outlet separating valve 6 successively, and safety check and outlet separating valve 6 are reliably isolated in order to system in needs with import separating valve 4 and outlet pressure modulating valve 7.The hydrodynamic pressure transmitter is housed, in order to the protection of system and the supervision of Operational Limits on inlet ductwork and export pipeline.
Export pipeline connects seal water system and user's branch road, and user's branch road is then set up according to user's actual demand, is provided with separating valve and safety check.Described user's branch road comprises valve water seal, axle envelope desuperheat, low pressure cylinder spray and auxilliary vapour desuperheat.
Suction booster and import and export separating valve and be electronic, its operation can be on the spot, also can be on the CRT in control room.
The outlet pressure modulating valve is a pneumatic valve, and the outlet pressure modulating valve can be regulated automatically according to setting value, also can be on CRT manual control.
When the suction booster inlet pressure was higher than certain certain value, suction booster was stopped transport.When operating suction booster fault, the hard warning appears in the control room.When sealing water-pressurization system pressure was reduced to certain certain value, the warning of feeling like jelly continued to drop to certain value, the warning of hardening.Whole system can also can be advanced DCS by all signals by PLC control on the spot, does not establish PLC control cabinet on the spot.The DCS in control room can control PLC control cabinet on the spot.
Working principle of the present invention is, utilizes existing condensate pump outlet water source, power station, carries out after the supercharging in the supply station in the condensate system as users such as the desuperheat in Sealing Water for Feedwater Pump, all kinds of steam line, vapour condenser spray desuperheating and valve seal water systems.After the frequency conversion of the condensate pump degree of depth, these user's hydraulic pressure originally will reduce inevitably.For preventing these user's cisco unity malfunctions, satisfy their demand with the water source after the supercharging.And then reach reduction condensate pump rotating speed, and reducing the motor power consumption, unit can reach best energy-saving effect when 50% load, unit operation is operated, and mainly is that the deaerator level adjusting function further promotes, and makes unit operation more stable.
Protection scope of the present invention is as the criterion with claim, not limited by specific embodiment.。
Claims (5)
1. power station condensate pump degree of depth frequency conversion system, comprise seal water system and condense the jellyfish pipe, it is characterized in that condensing and draw an inlet ductwork on the pipeline of jellyfish pipe, inlet ductwork is provided with suction booster, the import separating valve is arranged on and condenses between jellyfish pipe and the suction booster, the outlet port of inlet ductwork is provided with the recirculation circuit in order to the outlet pressure of regulating suction booster, the pipeline of recirculation circuit is connected on the jellyfish pipe that condenses, the suction booster outlet is provided with safety check and outlet separating valve successively, and export pipeline connects seal water system and user's branch road.
2. power station according to claim 1 condensate pump degree of depth frequency conversion system is characterized in that being equipped with on described inlet ductwork and the export pipeline hydrodynamic pressure transmitter.
3. power station according to claim 1 condensate pump degree of depth frequency conversion system is characterized in that described user's branch road is provided with separating valve and safety check.
4. power station according to claim 1 condensate pump degree of depth frequency conversion system is characterized in that described suction booster and inlet/outlet separating valve are electronic.
5. power station according to claim 1 condensate pump degree of depth frequency conversion system is characterized in that described outlet pressure modulating valve is a pneumatic valve, and the outlet pressure modulating valve is arranged on the recirculation circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2011101442373A CN102278299A (en) | 2011-05-31 | 2011-05-31 | Deep frequency conversion system of condensate pump of power station |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101442373A CN102278299A (en) | 2011-05-31 | 2011-05-31 | Deep frequency conversion system of condensate pump of power station |
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| CN102278299A true CN102278299A (en) | 2011-12-14 |
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| CN2011101442373A Pending CN102278299A (en) | 2011-05-31 | 2011-05-31 | Deep frequency conversion system of condensate pump of power station |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103133319A (en) * | 2013-02-20 | 2013-06-05 | 浙江省电力公司电力科学研究院 | Frequency converting control method and system of condensate pump of condensed steam generator set |
| CN104033390A (en) * | 2014-06-06 | 2014-09-10 | 西安热工研究院有限公司 | Condensate water pump and condensate water system for turbine set as well as control method for condensate water flow |
| CN104090589A (en) * | 2014-06-12 | 2014-10-08 | 国家电网公司 | Deoxygenator water level whole-course control system and method with tracking under condensate pump frequency conversion condition |
| CN106640738A (en) * | 2016-12-28 | 2017-05-10 | 中国能源建设集团华北电力试验研究院有限公司 | Protection method for safe operation of condensate water pump at special stage |
| CN110081000A (en) * | 2019-04-22 | 2019-08-02 | 中国神华能源股份有限公司 | Generating set |
| CN110120641A (en) * | 2019-04-25 | 2019-08-13 | 秦皇岛秦热发电有限责任公司 | Thermal Power Station's double-purpose frequency conversion system |
| CN110260295A (en) * | 2019-07-22 | 2019-09-20 | 神华福能发电有限责任公司 | A kind of condensate system |
| CN110528620A (en) * | 2019-09-17 | 2019-12-03 | 西安热工研究院有限公司 | A kind of cooling unit of closed cycle can depth frequency conversion riverside makeup Water System |
| CN111399556A (en) * | 2020-03-26 | 2020-07-10 | 华润电力技术研究院有限公司 | Control method and control system for deaerator water level and computer storage medium |
| CN116447125A (en) * | 2023-04-11 | 2023-07-18 | 济南奔腾时代电力科技有限公司 | Optimization method for deeply reducing power consumption rate of condensate pump of thermal power generating unit |
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| US4043419A (en) * | 1976-06-04 | 1977-08-23 | Eaton Corporation | Load sensing power steering system |
| CN1067942A (en) * | 1992-06-18 | 1993-01-13 | 蒲勋臣 | Pressure-adjusting device for high water supply |
| JP2001132648A (en) * | 1999-11-01 | 2001-05-18 | Hitachi Ltd | Starting method of private power generation for manhole pump |
| CN202082077U (en) * | 2011-05-31 | 2011-12-21 | 秦革 | Depth frequency conversion system of power station condensate pump |
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2011
- 2011-05-31 CN CN2011101442373A patent/CN102278299A/en active Pending
Patent Citations (4)
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| US4043419A (en) * | 1976-06-04 | 1977-08-23 | Eaton Corporation | Load sensing power steering system |
| CN1067942A (en) * | 1992-06-18 | 1993-01-13 | 蒲勋臣 | Pressure-adjusting device for high water supply |
| JP2001132648A (en) * | 1999-11-01 | 2001-05-18 | Hitachi Ltd | Starting method of private power generation for manhole pump |
| CN202082077U (en) * | 2011-05-31 | 2011-12-21 | 秦革 | Depth frequency conversion system of power station condensate pump |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103133319A (en) * | 2013-02-20 | 2013-06-05 | 浙江省电力公司电力科学研究院 | Frequency converting control method and system of condensate pump of condensed steam generator set |
| CN103133319B (en) * | 2013-02-20 | 2016-01-27 | 浙江省电力公司电力科学研究院 | A kind of condensing generator set Condensate Pump Frequency Conversion controlling method and system |
| CN104033390A (en) * | 2014-06-06 | 2014-09-10 | 西安热工研究院有限公司 | Condensate water pump and condensate water system for turbine set as well as control method for condensate water flow |
| CN104033390B (en) * | 2014-06-06 | 2016-09-14 | 西安热工研究院有限公司 | A kind of Steam Turbine condensate pump and condensate system and condensing water flow control method |
| CN104090589A (en) * | 2014-06-12 | 2014-10-08 | 国家电网公司 | Deoxygenator water level whole-course control system and method with tracking under condensate pump frequency conversion condition |
| CN106640738A (en) * | 2016-12-28 | 2017-05-10 | 中国能源建设集团华北电力试验研究院有限公司 | Protection method for safe operation of condensate water pump at special stage |
| CN110081000A (en) * | 2019-04-22 | 2019-08-02 | 中国神华能源股份有限公司 | Generating set |
| CN110120641A (en) * | 2019-04-25 | 2019-08-13 | 秦皇岛秦热发电有限责任公司 | Thermal Power Station's double-purpose frequency conversion system |
| CN110120641B (en) * | 2019-04-25 | 2024-04-09 | 秦皇岛秦热发电有限责任公司 | Dual-purpose frequency conversion system of thermal power plant |
| CN110260295A (en) * | 2019-07-22 | 2019-09-20 | 神华福能发电有限责任公司 | A kind of condensate system |
| CN110260295B (en) * | 2019-07-22 | 2024-06-04 | 神华福能发电有限责任公司 | Condensate system |
| CN110528620A (en) * | 2019-09-17 | 2019-12-03 | 西安热工研究院有限公司 | A kind of cooling unit of closed cycle can depth frequency conversion riverside makeup Water System |
| CN111399556A (en) * | 2020-03-26 | 2020-07-10 | 华润电力技术研究院有限公司 | Control method and control system for deaerator water level and computer storage medium |
| CN116447125A (en) * | 2023-04-11 | 2023-07-18 | 济南奔腾时代电力科技有限公司 | Optimization method for deeply reducing power consumption rate of condensate pump of thermal power generating unit |
| CN116447125B (en) * | 2023-04-11 | 2023-11-17 | 济南奔腾时代电力科技有限公司 | Optimization method for deeply reducing power consumption rate of condensate pump of thermal power generating unit |
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Application publication date: 20111214 |