CN102022144B - Thermal power generation system with function of exhaust steam recovery - Google Patents

Thermal power generation system with function of exhaust steam recovery Download PDF

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Publication number
CN102022144B
CN102022144B CN2010105420400A CN201010542040A CN102022144B CN 102022144 B CN102022144 B CN 102022144B CN 2010105420400 A CN2010105420400 A CN 2010105420400A CN 201010542040 A CN201010542040 A CN 201010542040A CN 102022144 B CN102022144 B CN 102022144B
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China
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steam
exhaust
water
exhaust steam
turbine
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CN2010105420400A
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Chinese (zh)
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CN102022144A (en
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荆有印
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华北电力大学(保定)
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00Climate change mitigation technologies for sector-wide applications
    • Y02P80/10Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
    • Y02P80/15On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply

Abstract

The invention discloses a thermal power generation system with the function of exhaust steam recovery, which belongs to the technical field of thermal power generation. The thermal power generation system comprises a boiler, a steam turbine, a generator, an exhaust-steam hot well, a closed pressure condensation tank, a centrifugal vapor compression machine and a membrane steam-water mix heater, wherein the boiler, the steam turbine and the generator are sequentially connected, and an exhaust steam outlet of the steam turbine is connected with the exhaust-steam hot well in which a water-spray cooling device is arranged; the condensed water discharged from the exhaust-steam hot well after sequentially passing through a hot-well condensate pump, the closed pressure condensation tank, a main condensate pump, the membrane steam-water mix heater, a water booster pump, a deaerator and a feed pump is fed into the boiler; and the exhaust steam discharged from the exhaust-steam hot well is divided into two parts after being pressurized by the centrifugal vapor compression machine, one part of exhaust steam is used for supplying heats for the outside, and the other part of exhaust steam is connected to the membrane steam-water mix heater to heat the condensed water. The thermal power generation system disclosed by the invention can recover huge amounts of thermal energies, and also can guarantee and stabilize the vacuum degree required by the steam turbine; and meanwhile, the problem of heat pollution caused by the exhaust steam of a cooling tower can be solved by using the thermal power generation system, and the water resource can be saved.

Description

A kind of thermal power generation system with function of exhaust steam recovery
Technical field
The present invention relates to a kind of can the recovery the exhaust steam of fired power generating unit, effectively reduce the thermal power generation system of latent heat of vaporization loss, belong to the thermal power generating technology field.
Background technique
The most basic heat power equipment comprises boiler, steam turbine, vapour condenser and water pump four parts in the thermal power plant, and the cyclic process that working medium is finished in these equipment is called " Rankine cycle ", and it is the basic circulation of steam power plant.Water is heated to saturation temperature in boiler, then flash to saturated vapour, is heated into superheated vapor through superheater again; Superheated vapor enters the turbine expansion acting; The exhaust steam of finishing merit is discharged into vapour condenser, is cooled to become water of condensation after emitting the latent heat of condensation in vapour condenser; Water pump is sent water of condensation back to boiler, begins next power cycle.In Rankine cycle, there is greatly the heat water that in vapour condenser, is cooled take away, form the vapour condenser cold source energy.This part heat accounts for and adds to more than 50% of working medium heat, and therefore, the key that improves cycle efficiency is how to utilize this part latent heat of vaporization.
For a long time, people have carried out unremitting effort for reducing the vapour condenser cold source energy, but it is very few to produce effects, and the vapour condenser cold source energy problem of condensed steam type unit can't solve always.The feedwater backheat is the comparatively effective method of the minimizing cold source energy taked of present people.So-called feedwater backheat is exactly to utilize the part steam of extracting out after the steam turbine intergrade to come heated feed water.Circulation with feedwater backheat is called " backheat circulation ".Because in the backheat circulation, the exhaust steam that enters vapour condenser reduces, the vapour condenser cold source energy reduces, so the thermal efficiency of the thermal efficiency ratio Rankine cycle of backheat circulation is high.In Practical Project, general in the parameter unit establish three, the level Four backheat, high pressure high temperature turbosets are established five, six grades of backheats, the ultra-high parameter unit is no more than seven, eight grades of backheats.However, still have considerable steam to enter vapour condenser, and at 0.004MPa
(absolute pressure) lower condensation heat, because these vapor (steam) temperatures are low, institute's liberated heat can't be utilized.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of thermal power generation system with function of exhaust steam recovery is provided, with effective minimizing latent heat of vaporization loss, improve the cycle efficiency of fired power generating unit.
Problem of the present invention realizes with following technical proposals:
A kind of thermal power generation system with function of exhaust steam recovery, comprise boiler, steam turbine, generator, exhaust steam hot well, hot well condensate pump, enclosed pressure condensate water tank, centrifugal vapour compression machine and membrane type steam-water injection in the formation, wherein, boiler, steam turbine, generator connect successively, and the exhaust steam outlet of steam turbine connects the exhaust steam hot well of built-in spraying temp. lowering apparatus; The water of condensation that described exhaust steam hot well is discharged is sent into boiler through hot well condensate pump, enclosed pressure condensate water tank, main condensate pump, membrane type steam-water injection, the water pump that boosts, oxygen-eliminating device and feed water pump successively; The exhaust steam that the exhaust steam hot well is discharged is divided into two-way after centrifugal vapour compression machine pressurization, one tunnel external heat supply, one tunnel access membrane type steam-water injection heat-setting water.
Above-mentioned thermal power generation system with function of exhaust steam recovery, described centrifugal vapour compression machine is driven by small turbine, the steam inlet of described small turbine connects extracted steam from turbine, the exhaust steam of its discharge is sent into enclosed pressure condensate water tank after the cooling of small turbine exhaust steam cooler, the cooling water inlet of described small turbine exhaust steam cooler connects the main condensate delivery side of pump, and coolant outlet connects enclosed pressure condensate water tank.
Above-mentioned thermal power generation system with function of exhaust steam recovery, also be connected with secondary membrane type steam-water injection, secondary boost water pump and low-pressure heater to the condensate line of oxygen-eliminating device in turn at the water pump that boosts, the steam inlet of described secondary membrane type steam-water injection connects the high pressure steam outlet of centrifugal vapour compression machine, the steam inlet of described low-pressure heater connects extracted steam from turbine, and hydrophobic outlet connects secondary membrane type steam-water injection.
Above-mentioned thermal power generation system with function of exhaust steam recovery is provided with high-pressure heater between described feed water pump and the boiler, and the steam inlet of described high-pressure heater connects extracted steam from turbine, and hydrophobic outlet connects oxygen-eliminating device.
Above-mentioned thermal power generation system with function of exhaust steam recovery, the steam inlet of described oxygen-eliminating device connects extracted steam from turbine.
The exhaust steam that the present invention adopts centrifugal vapour compression machine to reclaim fired power generating unit is used for heating boiler feedwater and externally heat supply after the exhaust steam pressurization of recovery, makes effective utilization of exhaust steam in steam turbine become possibility.The present invention can reclaim a large amount of heat energy, can guarantee again and the degree of vacuum of stable steam turbine requirement, can also solve the thermo-pollution problem of cooling tower steam discharge simultaneously, and can saving water resource.In the exhaust steam hot well spraying temp. lowering apparatus is set, makes a part of exhaust steam cooling condense into water of condensation, purpose is in order to reduce the load of centrifugal vapour compression machine.
System of the present invention is simple, reasonable in design, and effects of energy saving and emission reduction is remarkable, is applicable to energy-saving and emission-reduction engineering and the centrifugal vapour compression machine exhaust steam heat supply improvement project of new power plant construction and existing power plant.
Description of drawings
The invention will be further described below in conjunction with accompanying drawing.
Fig. 1 is the basic circulatory system schematic diagram of the present invention;
Fig. 2 is fired power generating unit principled thermal system schematic diagram.
Each label is among the figure: 1. boiler; 2. steam turbine; 3. generator; 4. oxygen-eliminating device; 5. feed water pump; 6. high-pressure heater; 7. spraying temp. lowering apparatus; 8. exhaust steam hot well; 9. hot well condensate pump; 10. enclosed pressure condensate water tank; 11. main condensate pump; 12. centrifugal vapour compression machine; 13. small turbine; 14. small turbine exhaust steam cooler; 15. membrane type steam-water injection; The water pump 16. boost; 17. secondary membrane type steam-water injection; The water pump 18. secondary boosts; 19. low-pressure heater; C. demineralized water; S. full factory is hydrophobic; H. heat supply network backwater; G. external heating steam.
Embodiment
Thinking of the present invention is: adopt centrifugal vapour compression machine to reclaim exhaust steam, divide two-way with the exhaust steam after boosting: one tunnel external heat supply, one the tunnel sends into the membrane type steam-water injection and water of condensation is carried out mixed heat transfer, hot water after the heating is as boiler feed water, after booster pump boosts, through oxygen-eliminating device, feed water pump to boiler.
Referring to Fig. 1, the present invention's formation comprises boiler 1, steam turbine 2, generator 3, oxygen-eliminating device 4, feed water pump 5, spraying temp. lowering apparatus 7, exhaust steam hot well 8, hot well condensate pump 9, enclosed pressure condensate water tank 10, main condensate pump 11, centrifugal vapour compression machine 12, small turbine 13, small turbine exhaust steam cooler 14, membrane type steam-water injection 15, water pump 16 boosts.Working procedure of the present invention is as follows: the exhaust steam of steam turbine 2 enters exhaust steam hot well 8, the exhaust steam hot well 8 interior spraying temp. lowering apparatus 7 that arrange, clean exhaust steam with demineralized water C, make a part of exhaust steam cooling condense into water of condensation, send into enclosed pressure condensate water tank 10 by hot well condensate pump 9; Exhaust steam in the centrifugal vapour compression machine 12 suction exhaust steam hot wells 8 is compressed into available steam with it, the exhaust steam one tunnel external heat supply (G among the figure) after boosting, and one the tunnel sends into membrane type steam-water injection 15 carries out mixed heat transfer with water of condensation; Hot water after the heating after the water pump 16 that boosts boosts, through oxygen-eliminating device 4, feed water pump 5 to boiler 1; The superheated vapor that boiler 1 is produced enters steam turbine 2 expansion actings.
Referring to Fig. 2, the unit principled thermal system comprises boiler 1, steam turbine 2, generator 3, oxygen-eliminating device 4, feed water pump 5, high-pressure heater 6, spraying temp. lowering apparatus 7, exhaust steam hot well 8, hot well condensate pump 9, enclosed pressure condensate water tank 10, main condensate pump 11, centrifugal vapour compression machine 12, small turbine 13, small turbine exhaust steam cooler 14, membrane type steam-water injection 15, the water pump 16 that boosts, secondary membrane type steam-water injection 17, secondary boost water pump 18, low-pressure heater 19.
Working procedure of the present invention is as follows: the exhaust steam of steam turbine 2 enters exhaust steam hot well 8, the exhaust steam hot well 8 interior spraying temp. lowering apparatus 7 that arrange, clean exhaust steam with demineralized water C, make a part of exhaust steam cooling condense into water of condensation, send into enclosed pressure condensate water tank 10 by hot well condensate pump 9; Exhaust steam in the centrifugal vapour compression machine 12 suction exhaust steam hot wells 8 is compressed into available steam with it, the exhaust steam one tunnel external heat supply (G among the figure) after boosting, and one the tunnel sends into membrane type steam-water injection 15 carries out mixed heat transfer with water of condensation; Hot water after the heating enters secondary membrane type steam-water injection 17 after booster pump 16 boosts, behind the compressed steam mixed heat transfer, boost water pump 18, low-pressure heater 19, oxygen-eliminating device 4, feed water pump 5, high-pressure heater 6 to boiler 1 through secondary; The superheated vapor that boiler 1 is produced enters steam turbine 2 expansion actings.

Claims (5)

1. thermal power generation system with function of exhaust steam recovery, it is characterized in that, power generation system comprises boiler (1) in consisting of, steam turbine (2), generator (3), exhaust steam hot well (8), hot well condensate pump (9) enclosed pressure condensate water tank (10), centrifugal vapour compression machine (12) and membrane type steam-water injection (15), wherein, boiler (1), steam turbine (2), generator (3) connects successively, the exhaust steam outlet of steam turbine (2) connects the exhaust steam hot well (8) of built-in spraying temp. lowering apparatus (7), and the water of condensation that described exhaust steam hot well (8) is discharged is successively through hot well condensate pump (9), enclosed pressure condensate water tank (10), main condensate pump (11), membrane type steam-water injection (15), water pump (16) boosts, oxygen-eliminating device (4) and feed water pump (5) are connected to boiler (1); The exhaust steam that exhaust steam hot well (8) is discharged is divided into two-way after centrifugal vapour compression machine (12) pressurization, one tunnel external heat supply, one tunnel access membrane type steam-water injection (15) heat-setting water.
2. described thermal power generation system with function of exhaust steam recovery according to claim 1, it is characterized in that, described centrifugal vapour compression machine (12) is driven by small turbine (13), the steam inlet of described small turbine (13) connects extracted steam from turbine, the exhaust steam of its discharge is sent into enclosed pressure condensate water tank (10) after small turbine exhaust steam cooler (14) cooling, the cooling water inlet of described small turbine exhaust steam cooler (14) connects the outlet of main condensate pump (11), and coolant outlet connects enclosed pressure condensate water tank (10).
3. described thermal power generation system with function of exhaust steam recovery according to claim 1 and 2, it is characterized in that, to the condensate line of oxygen-eliminating device (4), also be connected with secondary membrane type steam-water injection (17) at the water pump that boosts (16) in turn, secondary boost water pump (18) and low-pressure heater (19), the steam inlet of described secondary membrane type steam-water injection (17) connects the high pressure steam outlet of centrifugal vapour compression machine (12), the steam inlet of described low-pressure heater (19) connects extracted steam from turbine, and hydrophobic outlet connects secondary membrane type steam-water injection (17).
4. described thermal power generation system with function of exhaust steam recovery according to claim 3, it is characterized in that, be provided with high-pressure heater (6) between described feed water pump (5) and the boiler (1), the steam inlet of described high-pressure heater (6) connects extracted steam from turbine, and hydrophobic outlet connects oxygen-eliminating device (4).
5. described thermal power generation system with function of exhaust steam recovery according to claim 4 is characterized in that, the steam inlet of described oxygen-eliminating device (4) connects extracted steam from turbine.
CN2010105420400A 2010-11-12 2010-11-12 Thermal power generation system with function of exhaust steam recovery CN102022144B (en)

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