CN104456509A - Method for improving 50 MW gas and steam combined cycle electricity generation capacity - Google Patents
Method for improving 50 MW gas and steam combined cycle electricity generation capacity Download PDFInfo
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- CN104456509A CN104456509A CN201410693964.9A CN201410693964A CN104456509A CN 104456509 A CN104456509 A CN 104456509A CN 201410693964 A CN201410693964 A CN 201410693964A CN 104456509 A CN104456509 A CN 104456509A
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Abstract
The invention discloses a method for improving the 50 MW gas and steam combined cycle electricity generation capacity and belongs to the technical field of waste heat electricity generation. A gas turbine discharges smoke and sends the smoke to a three-pressure waste heat boiler, and steam with three kinds of parameters is generated. The first kind of steam is high-temperature sub-high-pressure steam and has the parameters that the pressure is 6.0 MPa and the temperature is 540 DEG C, and the steam is wholly sent to a turbine. The second kind of steam is low-pressure superheated steam and has the parameters that the pressure is 0.8 MPa and the temperature is 225 DEG C, and the steam is wholly sent to the turbine. The third steam is low-pressure saturated steam and has the parameters that the pressure is 0.2 MPa and the temperature is 120 DEG C, and the steam is used for deoxygenization of water. Compared with the prior art, the high-temperature sub-high-pressure steam enthalpy value is higher than that of the intermediate-temperature sub-high-pressure steam in the prior art, the acting capability is high, the comprehensive steam consumption of the turbine is low, and the general electricity generation load of a gas and steam combined cycle unit can reach 51.5 MW and is improved by 4.5 MW compared with that in the prior art. When steam generated by the waste heat boiler cannot meet the steam inlet requirement of the turbine, the steam is sent to a condenser after the adjustment of temperature and pressure reduction is conducted on the steam, and zero emission of the steam is achieved. Compared with the prior art, the noise pollution and the demineralized water loss caused by steam spreading are eliminated.
Description
Technical field
The invention belongs to cogeneration technology field, specifically providing a kind of method for improving 50MW gas steam combined cycle for power generation amount.
Background technology
50MW gas steam combined cycle for power generation is made up of fuel engine power generation unit and Turbo-generator Set, its principle is: the high temperature and high pressure flue gas expansion working in the gas turbine that fuel and combustion air mixed combustion produce, by the energy (flue gas pressures 0.5 ~ 1.0MPa of high temperature and high pressure flue gas, temperature 1000 ~ 1300 DEG C) convert mechanical energy to, promote the generating of fuel engine power generation machine; Flue-gas temperature after combustion engine acting is down to about 560 DEG C and is entered waste heat boiler, waste heat boiler recovered flue gas heat energy produces the work done of Steam Actuation steam turbine, the power conversion of steam is become mechanical energy, pushing turbine electrical power generators, form integrated gas-steam combined cycle power plant.
The steam turbine generator group technique principal character of existing 50MW integrated gas-steam combined cycle power plant is:
1, two pressure waste heat boiler is sent in gas turbine smoke evacuation, produces the steam of two kinds of parameters: one is middle temperature sub-high pressure steam, and parameter is: pressure 5.0MPa, and temperature 485 DEG C, all sends into steam turbine; Another kind is low-pressure steam, and parameter is: pressure 0.4MPa, and temperature 210 DEG C, water supply deoxygenation, remainder sends into steam turbine as filling.Middle temperature sub-high pressure steam enthalpy is relatively low, and acting ability is poor, and the comprehensive steam consumption of steam turbine is high, and waste heat boiler exhaust gas temperature is up to 138 DEG C, and combustion gas-total generation load of Steam Combined Cycle unit is only 47MW, does not reach rated value 50MW.
2, the steam that waste heat boiler produces does not reach steam turbine admission when requiring, steams and diffuses to air, define noise pollution, and cause demineralized water to waste.
Summary of the invention
The object of the present invention is to provide a kind of method for improving 50MW gas steam combined cycle for power generation amount, overcoming deficiencies such as not reaching quota, noise pollution, demineralized water waste.
The technical parameter of processing step of the present invention and control is:
1, the flue gas after combustion engine acting enters three pressure waste heat boilers, after flowing through high temperature sub-high pressure steam superheater, high pressure evaporator, low-pressure steam superheater, low pressure evaporator, low low-pressure steam evaporimeter and feed water preheater successively, temperature is down to 108 DEG C and is entered air.
2, three pressure waste heat boiler moisturizings send into oxygen-eliminating device after feed-water preheating actuator temperature reaches 90 DEG C, and the low low-pressure steam utilizing low low-pressure steam evaporimeter Mist heat recovering to produce carries out deoxygenation to feedwater.
3, the water after deoxygenation delivers to high and low pressure drum by high and low pressure feed pump respectively, presses the high pressure evaporator of waste heat boilers and low pressure evaporator to produce the saturated vapor of 6.0MPa and the saturated vapor of 0.8MPa by three.
4, the saturated vapor of 6.0MPa and the saturated vapor of 0.8MPa produce the low-pressure superheated steam of pressure 6.0MPa, the high temperature sub-high pressure steam of temperature 540 DEG C and pressure 0.8MPa, temperature 225 DEG C respectively by the high temperature sub-high pressure steam superheater of three pressure waste heat boilers and low-pressure steam superheater.
5, the low-pressure superheated steam of the high temperature sub-high pressure steam of pressure 6.0MPa, temperature 540 DEG C and pressure 0.8MPa, temperature 225 DEG C delivers to main vapour entrance and the filling entrance pushing turbine acting generating of full admission high temperature sub-high pressure steam turbine respectively by pipeline.
6, high temperature sub-high pressure steam establishes steam by-pass:
Gas-steam combined circulating generation unit startup stage, when the admission that steam quality does not meet steam turbine requires, turbine inlet stop valve is closed, high temperature sub-high pressure steam by-pass control valve is opened, and high temperature sub-high pressure steam enters condenser through high temperature sub-high pressure steam by-pass control valve, high temperature sub-high pressure steam by-pass one-level restricting orifice, high temperature sub-high pressure steam by-pass two-step throttle orifice plate; When the admission that steam quality reaches steam turbine requires, turbine inlet stop valve is opened, and high temperature and high pressure steam bypass valve is closed, and steam enters steam turbine, pushing turbine acting generating.
When gas-steam combined circulating generation unit chaser, turbine inlet stop valve is closed, high temperature sub-high pressure steam by-pass control valve is opened rapidly, and steam enters condenser after high temperature sub-high pressure steam by-pass control valve, high temperature sub-high pressure steam by-pass one-level restricting orifice, high temperature sub-high pressure steam by-pass two-step throttle orifice plate.
7, low-pressure superheated steam establishes low-pressure superheated steam bypass:
Gas-steam combined circulating generation unit startup stage, when the admission that steam quality does not meet steam turbine requires, steam turbine low-pressure filling valve cuts out, low-pressure superheated steam bypass valve is opened, when the admission that steam quality reaches steam turbine requires, steam turbine low-pressure filling valve is opened, and low-pressure superheated steam bypass valve is closed, low-pressure superheated steam enters steam turbine, pushing turbine acting generating.
When full admission high temperature sub-high pressure steam turbine chaser, steam turbine low-pressure filling valve cuts out, and low-pressure superheated steam bypass valve is opened rapidly, and low-pressure superheated steam enters condenser through low-pressure superheated steam bypass valve, low-pressure superheated steam by-pass throttle orifice plate.
Principal character of the present invention is:
1, gas turbine smoke evacuation feeding three presses waste heat boiler, produces the steam of three kinds of parameters: the first is high temperature sub-high pressure steam, and parameter is: pressure 6.0MPa, and temperature 540 DEG C, all sends into steam turbine; The second is low-pressure superheated steam, and parameter is: pressure 0.8MPa, and temperature 225 DEG C, all sends into steam turbine, and the third is low low-pressure saturated steam, and parameter is: pressure 0.2MPa, temperature 120 DEG C, water supply deoxygenation.Compared with the prior art, high temperature sub-high pressure steam enthalpy is higher than sub-high pressure steam warm in prior art, and acting ability is strong, and the comprehensive steam consumption of steam turbine is low, and combustion gas-total generation load of Steam Combined Cycle unit can reach 51.5MW, improves 4.5MW than prior art.
2, establish except oxygen evaporator and feed water preheater in three pressure waste heat boiler low-temperature zone, add a pressure stage than existing two pressure waste heat boiler technology, exhaust gas temperature is down to 108 DEG C, lower than prior art 30 DEG C, and waste heat boiler efficiency improves 5% than prior art.
3, when waste heat boiler produce steam do not reach steam turbine admission require time, steam through pressure and temperature reducing regulate after send into condenser, realize steam " zero diffuse ", compared with the prior art, eliminate steam releasing formed noise pollution and demineralized water loss.
Accompanying drawing explanation
Fig. 1 is the equipment arrived involved in the present invention, wherein: high temperature sub-high pressure steam superheater 1, low-pressure steam superheater 2, low low-pressure steam evaporimeter 3, high temperature sub-high pressure superheat steam pipeline 4, high temperature sub-high pressure superheat steam pipeline bypass 5, high temperature sub-high pressure superheated steam bypass valve 6, high temperature sub-high pressure superheated steam bypass one-level restricting orifice 7, high temperature sub-high pressure superheated steam bypass two-step throttle orifice plate 8, full admission time high temperature sub-high pressure steam turbine 9, low-pressure superheated steam pipeline 10, low-pressure superheated steam pipeline bypass 11, low-pressure superheated steam bypass valve 12, low-pressure superheated steam by-pass throttle orifice plate 13, condenser 14, high pressure evaporator 15, low pressure evaporator 16, feed water preheater 17.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described.
High temperature sub-high pressure superheater 1, high pressure evaporator 15, low-pressure steam superheater 2, low pressure evaporator 16, low low-pressure steam evaporimeter 3 and the feed water preheater 17 of high-temperature flue gas successively in three pressure waste heat boilers that gas turbine is discharged, be down to 108 DEG C and enter air by flue-gas temperature.Three pressure waste heat boilers produce high temperature sub-high pressure superheated steam, low-pressure superheated steam and low low-pressure saturated steam.High temperature sub-high pressure steam is leaded up to high temperature sub-high pressure jet chimney 4 and is accessed full admission high temperature sub-high pressure steam turbine 9, and high temperature sub-high pressure jet chimney bypass 5 of separately leading up to enters condenser 14 through high temperature sub-high pressure steam by-pass control valve 6, high temperature sub-high pressure steam by-pass one-level restricting orifice 7, high temperature sub-high pressure steam by-pass two-step throttle orifice plate 8.When gas-steam combined circulating generation unit starts, when the admission that steam quality does not meet full admission high temperature sub-high pressure steam turbine 9 requires, high temperature sub-high pressure steam by-pass control valve 6 is opened, and full admission high temperature sub-high pressure steam turbine 9 entrance stop valve is closed; When steam quality reach the admission entering full admission high temperature sub-high pressure steam turbine 9 require time, high temperature and high pressure steam bypass valve 6 is closed, and full admission high temperature sub-high pressure steam turbine 9 entrance stop valve is opened, pushing turbine do work; When full admission high temperature sub-high pressure steam turbine 9 chaser, full admission high temperature sub-high pressure steam turbine 9 entrance stop valve is closed, and high temperature sub-high pressure steam by-pass control valve 6 is opened rapidly, enters condenser 14 after steam pressure-reducing desuperheat.Low-pressure superheated steam one road low-pressure superheated steam pipeline 10 accesses full admission high temperature sub-high pressure steam turbine 9 filling mouth, separately lead up to low-pressure superheated steam pipeline bypass 11 through low-pressure superheated steam bypass valve 12, low-pressure superheated steam by-pass throttle orifice plate 13 enters condenser 14, when gas-steam combined circulating generation unit starts, when the admission that steam quality does not meet full admission high temperature sub-high pressure steam turbine 9 requires, low-pressure superheated steam bypass valve 12 is opened, full admission high temperature sub-high pressure steam turbine 9 low pressure filling valve cuts out, when steam quality meets the requirement entering full admission high temperature sub-high pressure steam turbine 9, low-pressure superheated steam bypass valve 12 is closed, full admission high temperature sub-high pressure steam turbine 9 low pressure filling valve is opened, pushing turbine does work, when full admission high temperature sub-high pressure steam turbine 9 chaser, full admission high temperature sub-high pressure steam turbine 9 low pressure filling valve cuts out, and low-pressure superheated steam enters condenser 14 through low-pressure superheated steam bypass valve 12, low-pressure superheated steam by-pass throttle orifice plate 13.
Claims (1)
1. for improving a method for 50MW gas steam combined cycle for power generation amount, it is characterized in that, the technical parameter of processing step and control is:
(1) flue gas after combustion engine acting enters three pressure waste heat boilers, after flowing through high temperature sub-high pressure steam superheater, high pressure evaporator, low-pressure steam superheater, low pressure evaporator, low low-pressure steam evaporimeter and feed water preheater successively, temperature is down to 108 DEG C and is entered air;
(2) three pressure waste heat boiler moisturizings send into oxygen-eliminating device after feed-water preheating actuator temperature reaches 90 DEG C, and the low low-pressure steam utilizing low low-pressure steam evaporimeter Mist heat recovering to produce carries out deoxygenation to feedwater;
(3) water after deoxygenation delivers to high and low pressure drum by high and low pressure feed pump respectively, presses the high pressure evaporator of waste heat boilers and low pressure evaporator to produce the saturated vapor of 6.0MPa and the saturated vapor of 0.8MPa by three;
(4) saturated vapor of 6.0MPa and the saturated vapor of 0.8MPa produce the low-pressure superheated steam of pressure 6.0MPa, the high temperature sub-high pressure steam of temperature 540 DEG C and pressure 0.8MPa, temperature 225 DEG C respectively by the high temperature sub-high pressure steam superheater of three pressure waste heat boilers and low-pressure steam superheater;
(5) low-pressure superheated steam of the high temperature sub-high pressure steam of pressure 6.0MPa, temperature 540 DEG C and pressure 0.8MPa, temperature 225 DEG C delivers to main vapour entrance and the filling entrance pushing turbine acting generating of full admission high temperature sub-high pressure steam turbine respectively by pipeline;
(6) high temperature sub-high pressure steam establishes steam by-pass:
Gas-steam combined circulating generation unit startup stage, when the admission that steam quality does not meet steam turbine requires, turbine inlet stop valve is closed, high temperature sub-high pressure steam by-pass control valve is opened, and high temperature sub-high pressure steam enters condenser through high temperature sub-high pressure steam by-pass control valve, high temperature sub-high pressure steam by-pass one-level restricting orifice, high temperature sub-high pressure steam by-pass two-step throttle orifice plate; When the admission that steam quality reaches steam turbine requires, turbine inlet stop valve is opened, and high temperature and high pressure steam bypass valve is closed, and steam enters steam turbine, pushing turbine acting generating;
When gas-steam combined circulating generation unit chaser, turbine inlet stop valve is closed, high temperature sub-high pressure steam by-pass control valve is opened rapidly, and steam enters condenser after high temperature sub-high pressure steam by-pass control valve, high temperature sub-high pressure steam by-pass one-level restricting orifice, high temperature sub-high pressure steam by-pass two-step throttle orifice plate;
(7) low-pressure superheated steam establishes low-pressure superheated steam bypass:
Gas-steam combined circulating generation unit startup stage, when the admission that steam quality does not meet steam turbine requires, steam turbine low-pressure filling valve cuts out, low-pressure superheated steam bypass valve is opened, when the admission that steam quality reaches steam turbine requires, steam turbine low-pressure filling valve is opened, and low-pressure superheated steam bypass valve is closed, low-pressure superheated steam enters steam turbine, pushing turbine acting generating;
When full admission high temperature sub-high pressure steam turbine chaser, steam turbine low-pressure filling valve cuts out, and low-pressure superheated steam bypass valve is opened, and low-pressure superheated steam enters condenser through low-pressure superheated steam bypass valve, low-pressure superheated steam by-pass throttle orifice plate.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112303608A (en) * | 2019-07-26 | 2021-02-02 | 三菱动力株式会社 | Boiler power generation equipment and control method thereof |
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| DE1233211B (en) * | 1962-09-29 | 1967-01-26 | Siemens Ag | Heating and power plant with gas turbine system and steam power system |
| JPS5612003A (en) * | 1979-07-12 | 1981-02-05 | Kawasaki Steel Corp | Waste heat recovery unit |
| US5577377A (en) * | 1993-11-04 | 1996-11-26 | General Electric Co. | Combined cycle with steam cooled gas turbine |
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| CN201897203U (en) * | 2011-03-31 | 2011-07-13 | 广州大学城华电新能源有限公司 | Residual heat boiler adopted by power plant/energy resource station |
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| CN112303608A (en) * | 2019-07-26 | 2021-02-02 | 三菱动力株式会社 | Boiler power generation equipment and control method thereof |
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Application publication date: 20150325 |