CN103575124A - Steam exhaust cooling system of driving steam turbine of thermal power plant and thermal power unit - Google Patents
Steam exhaust cooling system of driving steam turbine of thermal power plant and thermal power unit Download PDFInfo
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- CN103575124A CN103575124A CN201210249937.3A CN201210249937A CN103575124A CN 103575124 A CN103575124 A CN 103575124A CN 201210249937 A CN201210249937 A CN 201210249937A CN 103575124 A CN103575124 A CN 103575124A
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a steam exhaust cooling system of a driving steam turbine of a thermal power plant and a thermal power unit. The steam exhaust cooling system of the driving steam turbine comprises the driving steam turbine, an air preheater and a fan and also comprises an air cooler; the steam exhaust of the driving steam turbine is cooled by the air cooler through the inlet air from the fan; the steam exhaust inlet of the air cooler is connected with the steam exhaust outlet of the driving steam turbine; the air inlet of the air cooler is connected with the fan; the air outlet of the air cooler is connected with the air inlet of the air preheater. According to the steam exhaust cooling system of the driving steam turbine of the thermal power plant and the thermal power unit, the steam exhaust energy of the driving steam turbine is effectively utilized and accordingly the efficiency of the thermal power plant is improved, meanwhile the coal consumption is reduced, and emissions of pollutants are reduced.
Description
Technical field
The present invention relates to thermal power generation field, be specifically related to the exhaust steam cooling system of driving steam turbine in thermal power generation.
Background technology
Along with the development of national economy, society constantly improves the demand of electric power.For carrying out the new developing country of industrialization and rapid economic development, as China, the consumption of electric power and the installed capacity in power plant increase rapidly.For China, owing to being subject to the maintenance variety of its primary energy and storing quantitative limitation, the fuel in power plant be take coal as main in recent decades, be about more than 70%, and this trend does not in a foreseeable future have basic change.Although coal fired thermal power plant has the advantages such as cost is lower, fuel source is extensive for China, there is the shortcomings such as efficiency is lower, pollutant emission is more in coal fired thermal power plant.Owing to being discharged into pollutant in atmosphere and substantially deriving from the burning of coal, thus relevant between the discharge capacity of pollutant and the coal consumption amount of thermal power plant.When reducing thermal power plant coal consumption, also reduced thermal power plant to the discharge capacity of pollutant in atmosphere.
Some rotating machinerys of thermal power plant, by as feed pump, blower fan etc., are often driven by driving steam turbine (also claiming small turbine).In current power plant, the exhaust steam of driving steam turbine (steam discharge) enters condenser by circulating water, is referred to as clammy.Also have the driving steam turbine exhaust steam of indivedual power plant cooling by air cooling condenser, employing cooling blower in atmosphere, is called air cooling by exhaust steam thermal release.
The existing driving steam turbine exhaust steam type of cooling, clammy or air is cooling does not reclaim the energy in exhaust steam.And in exhaust steam, contain a large amount of energy, and be mainly vaporization potential, if because utilizing driving steam turbine exhaust steam energy to bring very large benefit to energy saving for power plants, improve the efficiency of thermal power plant, can reduce coal consumption, reduce the discharge capacity of pollutant simultaneously.
Summary of the invention
The object of this invention is to provide a kind of system and fired power generating unit of utilizing the exhaust steam energy of driving steam turbine.
For achieving the above object, the invention provides a kind of thermal power plant driving steam turbine exhaust steam cooling system, comprise driving steam turbine, air preheater and blower fan, it is characterized in that:
Described exhaust steam cooling system also comprises aerial cooler, and described aerial cooler is by the exhaust steam of the cooling described driving steam turbine of air intake from described blower fan; And
The exhaust steam entrance of described aerial cooler is connected with the exhaust steam of described driving steam turbine outlet, and the air inlet of described aerial cooler is connected with described blower fan, and the air outlet of described aerial cooler is connected with the air inlet of described air preheater.
In one preferred embodiment, described driving steam turbine can drive feed pump, air-introduced machine, water circulating pump, primary air fan, pressure fan or condensate pump, also can drive generator generating.
Preferably, exhaust steam enters the condenser of electric turbine to reclaim working medium after supercooling condenses into water, or the heater of getting back to heat regenerative system according to condensing water temperature is to reclaim working medium and heat.
Preferably, described blower fan comprises boiler fan and/or primary air fan.
The present invention also provides a kind of fired power generating unit, and described fired power generating unit comprises generator, electric turbine, boiler, deduster, high-pressure heater, low-pressure heater, flue gas-to water-to-water heat exchanger and above-mentioned driving steam turbine exhaust steam cooling system;
Wherein, the outlet of described boiler and described flue gas-is connected to water-to-water heat exchanger fume side, described flue gas-be connected with described high-pressure heater to water-to-water heat exchanger water side;
A part of high-temperature flue gas of the outlet of described boiler is by described flue gas-give water-to-water heat exchanger, heated feed water.
In another preferred embodiment, described fired power generating unit also comprises:
Flue gas-condensate water heat exchanger;
Wherein, described flue gas-be connected to the outlet of water-to-water heat exchanger fume side with described flue gas-condensate water heat exchanger fume side;
The outlet of described flue gas-condensate water heat exchanger fume side is connected with the outlet of described air preheater; And
The water side of described flue gas-condensate water heat exchanger is connected with low-pressure heater, heat-setting water.
In another preferred embodiment, from flue gas flow, described flue gas-in parallel with described air preheater to water-to-water heat exchanger and flue gas-condensate water heat exchanger.
In another preferred embodiment, feedwater flow process, described flue gas-connect to water-to-water heat exchanger with described high-pressure heater.
In another preferred embodiment, feedwater flow process, described flue gas-give water-to-water heat exchanger in parallel with described high-pressure heater, after a part of feedwater is separated with feedwater main road by described flue gas-be heated to water-to-water heat exchanger, converge with feedwater main road again, burble point and point be respectively the upstream, downstream of all high-pressure heaters or arbitrarily two-stage high-pressure heater between.
In another preferred embodiment, feedwater flow process, described flue gas-give water-to-water heat exchanger with high-pressure heater parallel connection simultaneously and connect.
In another preferred embodiment, described flue gas-be arranged in the upstream of all high-pressure heaters or be arranged in the downstream of all high-pressure heaters or be arranged in described in any two-stage between high-pressure heater to water-to-water heat exchanger.
In another preferred embodiment, condensate water flow process, described flue gas-condensate water heat exchanger is connected with described low-pressure heater.
In another preferred embodiment, condensate water flow process, described flue gas-condensate water heat exchanger is in parallel with described low-pressure heater, after part condensate water is separated with condensate water main road, by described flue gas-condensate water heat exchanger, be heated, converge with condensate water main road again, burble point and point be respectively the upstream, downstream of all low-pressure heaters or arbitrarily two-stage low-pressure heater between.
In another preferred embodiment, described flue gas-condensate water heat exchanger and described low-pressure heater are simultaneously in parallel and connect.
In another preferred embodiment, described flue gas-condensate water heat exchanger is arranged in the upstream of all low-pressure heaters or is arranged in the downstream of all low-pressure heaters or is arranged between any two described low-pressure heaters.
In another preferred embodiment, described fired power generating unit is also included in the storage heater of arranging on the hot Secondary Air of described air preheater outlet, wherein, described storage heater adopts drawing gas as adding hot vapour source of steam turbine, to heat the hot Secondary Air of air preheater outlet.
In another preferred embodiment, on the flue that enters described flue gas-give water-to-water heat exchanger and described flue gas-condensate water heat exchanger, controllable register door is also set, described condition baffle plate is used for regulating exhaust gas volumn.
In another preferred embodiment, described fired power generating unit also can be provided with feed water booster pump, and described feed water booster pump is for overcoming described flue gas-the give resistance of water-to-water heat exchanger.
In another preferred embodiment, described fired power generating unit also can be provided with condensate booster pump, and described condensate booster pump is for overcoming the resistance of described flue gas-condensate water heat exchanger.
Preferably, 1 the above flue gas-give water-to-water heat exchanger is set in fired power generating unit of the present invention.
Preferably, 1 the above flue gas-condensate water heat exchanger is set in fired power generating unit of the present invention.
In the present invention, described feedwater and condensate water can derive from the steam turbine of this fired power generating unit, maybe can derive from the steam turbine of other fired power generating unit.
Preferably, the fuel of described fired power generating unit is coal, combustion gas body or oil.Fired power generating unit of the present invention is single reheat fired power generating unit, or double reheat fired power generating unit.Driving steam turbine exhaust steam cooling system of the present invention and generating set utilize boiler fan and primary air fan to carry out cooling to driving steam turbine exhaust steam, wind and the Secondary Air of sending into boiler are heated, and be gas energy cascade utilization by this energy replacement, be that inferior exhaust steam energy becomes high-quality energy after replacing, with heated feed water and condensate water.That is, (1) adopt primary air fan and/or pressure fan cooling to the exhaust steam of driving steam turbine by aerial cooler, wind of heating blower outlet simultaneously and/or Secondary Air.(2) the part high-temperature flue gas of boiler economizer outlet is without air preheater, and successively by flue gas-give water-to-water heat exchanger and flue gas-condensate water heat exchanger, heated feed water and condensate water, reduced the required electric turbine amount of drawing gas of high-pressure heater, improved feed temperature, meanwhile, also reduced the electric turbine amount of drawing gas that low-pressure heater draws gas required.Therefore, reduce electric turbine hear rate, reduced the coal consumption amount of fired power generating unit, the discharge capacity of minimizing fired power generating unit pollutant.
To sum up, tool of the present invention has the following advantages:
(1) take full advantage of the latent heat of vaporization in the energy of driving steam turbine exhaust steam, especially exhaust steam.
(2) driving steam turbine exhaust steam adopts cooling air mode system simple.
(3), by exhaust steam energy is replaced into gas energy, by having realized the cascade utilization of energy, improved the utilization rate of energy.
(4) improved and entered air preheater cold wind temperature, avoided the cold junction heated surface corrosion of air preheater.Compare with the scheme of current conventional employing steam warming machine or hot blast recirculation, the present invention is less to the negative effect of unit whole efficiency.
(5) adopt flue gas and condensate water, flue gas and to the mode of water direct heat-exchange, system is simple, cost is low.
(6) extracted steam from turbine heating air preheater exports hot Secondary Air, improves boiler inlet temperature.
Accompanying drawing explanation
Fig. 1 is the system layout schematic diagram of an embodiment of driving steam turbine exhaust steam cooling system of the present invention;
Fig. 2 is the system schematic of an embodiment of fired power generating unit of the present invention;
Fig. 3 is the block diagram of an embodiment of the position of flue gas of the present invention-give water-to-water heat exchanger;
Fig. 4 is the block diagram of another embodiment of the position of flue gas of the present invention-give water-to-water heat exchanger;
Fig. 5 is the block diagram of another embodiment of the position of flue gas of the present invention-give water-to-water heat exchanger;
Fig. 6 is the block diagram of another embodiment of the position of flue gas of the present invention-give water-to-water heat exchanger;
Fig. 7 is the block diagram of another embodiment of the position of flue gas of the present invention-give water-to-water heat exchanger;
Fig. 8 is the block diagram of another embodiment of the position of flue gas of the present invention-give water-to-water heat exchanger;
Fig. 9 is the block diagram of an embodiment of the position of flue gas-condensate water heat exchanger of the present invention;
Figure 10 is the block diagram of another embodiment of the position of flue gas-condensate water heat exchanger of the present invention;
Figure 11 is the block diagram of another embodiment of the position of flue gas-condensate water heat exchanger of the present invention; And
Figure 12 is the block diagram that an embodiment of storage heater is set on the basis of Fig. 2.
The specific embodiment
Below with reference to accompanying drawing, preferred embodiment of the present invention is elaborated, so that clearer understanding objects, features and advantages of the present invention.It should be understood that embodiment shown in the drawings is not limitation of the scope of the invention, and just for the connotation of technical solution of the present invention is described.In figure, same or analogous part uses the same reference numerals to represent.
Below, major technique term of the present invention is described.
Herein, described boiler main will comprise boiler plant.Described boiler plant is not specifically limited, and only otherwise goal of the invention of the present invention is produced to restriction, is well known by persons skilled in the art.Can adopt π type boiler (or claiming to send type boiler), tower boiler, inverted U boiler etc., can be coal-burning boiler, oil burning boiler etc., can be natural circulation boiler, forced circulation boiler, direct current cooker etc., all in protection scope of the present invention.
Herein, described air preheater is not specifically limited, and only otherwise goal of the invention of the present invention is produced to restriction, is well known by persons skilled in the art.Can adopt tubular preheater, rotary preheater etc., all in protection scope of the present invention.
Herein, described deduster refers to the equipment that catches dust in flue gas.Only otherwise goal of the invention of the present invention is produced to restriction, be well known by persons skilled in the art.Can adopt electrostatic precipitator, cloth bag flue gas ash removal unit, electricity bag flue gas ash removal unit, moisture film flue gas ash removal unit etc., all in protection scope of the present invention.
Herein, described aerial cooler is a heat exchanger, or is parallel connection, series connection, series-parallel several heat exchangers.
Herein, described flue gas-to water-to-water heat exchanger, be a heat exchanger, or be parallel connection, series connection, series-parallel several heat exchangers.
Herein, described flue gas-condensate water heat exchanger is a heat exchanger, or is parallel connection, series connection, series-parallel several heat exchangers.
Herein, described blower fan is not specifically limited, and only otherwise goal of the invention of the present invention is produced to restriction, is well known by persons skilled in the art.Can adopt centrifugal fan, axial fan etc., all in protection scope of the present invention.
Herein, described flue gas-comprise pipe heat exchanger, plate type heat exchanger, surface-type heat exchanger, indirect-heating heat exchanger etc. to water-to-water heat exchanger, all in protection scope of the present invention.
Herein, described flue gas-condensate water heat exchanger comprises pipe heat exchanger, plate type heat exchanger, surface-type heat exchanger, indirect-heating heat exchanger etc., all in protection scope of the present invention.
Herein, described aerial cooler comprises pipe heat exchanger, plate type heat exchanger, surface-type heat exchanger, indirect-heating heat exchanger etc., all in protection scope of the present invention.
Herein, described high-pressure heater refers to the heater with the heated feed water that draws gas of steam turbine.
Herein, low-pressure heater refers to the heater with the heat-setting water that draws gas of steam turbine.
Herein, driving steam turbine refers to for driving feed pump, or air-introduced machine, or water circulating pump, or primary air fan, or pressure fan, or condensate pump, or other rotating machinery, or drives the steam turbine of generator.
Herein, driving steam turbine exhaust steam refers to that steam enters the steam discharge after driving steam turbine acting.
Below describe embodiments of the present invention in detail.Fig. 1 is the system layout schematic diagram of an embodiment of driving steam turbine exhaust steam cooling system of the present invention.As shown in Figure 1, in driving steam turbine exhaust steam cooling system, by for driving such as the exhaust steam out of the driving steam turbine 101 of the driven equipments such as pump 105 first by aerial cooler 102, this aerial cooler 102 is similar with the air cooling condenser of Air-cooled Unit.The exhaust steam entrance of aerial cooler 102 is connected with the exhaust steam of driving steam turbine 101 outlet, and the exhaust steam outlet of aerial cooler 102 is connected with electric turbine condenser 103.The air inlet of aerial cooler 102 is connected with pressure fan and/or primary air fan 104, and the wind outlet of aerial cooler 102 is connected with the air inlet of air preheater 2.
The exhaust steam of driving steam turbine 101 enters after aerial cooler 102, by cooling from the cold wind of pressure fan and/or primary air fan 104, exhaust steam enters the condenser 103 of electric turbine to reclaim working medium (as shown in Figure 1) after supercooling condenses into water, and the heater that also can get back to heat regenerative system according to condensing water temperature is to reclaim working medium and heat.Meanwhile, from pressure fan/or the cold wind of primary air fan 104 enter air preheater 2 after being heated.
In other words, from the exhaust steam of driving steam turbine 101, heated wind and the Secondary Air of air preheater 2 imports, to maintain or to maintain burner air intake (instant heating Secondary Air) temperature and coal pulverizer air intake (being heat primary air) temperature as far as possible.Thus, the energy of exhaust steam (the especially latent heat of vaporization) is converted to the heat primary air of air preheater 2 outlets and the energy of hot Secondary Air.And in existing thermal power plant, the normal flue gas adopting from boiler export of wind of air preheater import and Secondary Air, needs to consume a part of gas energy.Yet, because the flue-gas temperature of boiler export is up to 350～400 ℃ of left and right, therefore it also can be used to heat feedwater and the condensate water of higher temperature, therefore wishes to reduce the exhaust gas volumn of the wind and the Secondary Air that are used for heating air preheater import in the flue gas of boiler export as far as possible.
In the present invention, because the cold wind of air preheater import can heat by driving steam turbine exhaust steam, therefore greatly reduced the amount of the boiler export high-temperature flue gas that is used for heating in air preheater wind and Secondary Air in prior art.The high-temperature flue gas displacing is used for heating feedwater and the condensate water in fired power generating unit.
Fig. 2-12 illustrate displaced boiler export flue gas for heating the structural plan of the feedwater of fired power generating unit and the embodiment of condensate water.Referring to Fig. 2, in the present embodiment, fired power generating unit comprises: boiler 1, air preheater 2, deduster 3, pressure fan/primary air fan 104, flue gas-give water-to-water heat exchanger 11, flue gas-condensate water heat exchanger 12, high-pressure heater 13, oxygen-eliminating device 14, low-pressure heater 15, generator 16, electric turbine (high pressure cylinder, intermediate pressure cylinder, low pressure (LP) cylinder) 17 and driving steam turbine 101.
As shown in Figure 2, the outlet of boiler 1 simultaneously with air preheater 2 and flue gas-be connected to water-to-water heat exchanger 11.Flue gas-be connected to water-to-water heat exchanger 11 with high-pressure heater 13.Flue gas-condensate water heat exchanger 12 and flue gas-be connected to the outlet of water-to-water heat exchanger 11 with low-pressure heater 15.
The outlet of flue gas-be connected to boiler 1 to water-to-water heat exchanger 11, the part in the flue gas that boiler 1 burning produces is by flue gas-to water-to-water heat exchanger 11 heated feed waters.In the present embodiment, from flue gas flow, flue gas-give water-to-water heat exchanger 11 in parallel with air preheater 2.Feedwater flow process, flue gas-give water-to-water heat exchanger 11 in parallel with high-pressure heater 13, i.e. by flue gas-be heated to water-to-water heat exchanger 11, then converge with the main road that feeds water after part feedwater is separated with feedwater main road.Burble point and point can be respectively the upstream, downstream of all high-pressure heaters or arbitrarily two-stage high-pressure heater between.Flue gas-to water-to-water heat exchanger, be one-level, but can be also multistage.
Flue gas is through flue gas-give after water-to-water heat exchanger 11, and from flue gas-give the flue gas of water-to-water heat exchanger 11 outlets by flue gas-condensate water heat exchanger 12 heat-setting water, flue gas-condensate water 12 is connected with low-pressure heater 15.In the present embodiment, condensate water flow process, flue gas-condensate water heat exchanger 12 is in parallel with low-pressure heater 15, and a part of condensate water is heated by flue gas-condensate water heat exchanger after separated with condensate water main road, then converges with condensate water main road.Burble point and point can be respectively the upstream, downstream of all low-pressure heaters or arbitrarily two-stage low-pressure heater between.Flue gas-condensate water heat exchanger is one-level, but can be also multistage.
Flue gas, after flue gas-condensate water heat exchanger 12, mixes with the flue gas of air preheater 2 outlets from the flue gas of flue gas-condensate water heat exchanger 12 outlets.After two strands of above-mentioned flue gases mix, through deduster 3, then enter desulfuration absorbing tower.
In the above-described embodiments, be also provided with aerial cooler 102, the exhaust steam entrance of aerial cooler 102 is connected with the exhaust steam of driving steam turbine 101 outlet, and exhaust steam outlet is connected with electric turbine condenser 103.The air inlet of aerial cooler 102 is connected with pressure fan and/or primary air fan 104, and the outlet of aerial cooler 102 is connected with the air inlet of air preheater 2.Thus, formed driving steam turbine exhaust steam cooling system.
The exhaust steam of driving steam turbine 101 enters after aerial cooler 102, and by cooling from the cold wind of pressure fan and/or primary air fan 104, exhaust steam enters the condenser 103 of electric turbine 16 to reclaim working medium after supercooling condenses into water.Meanwhile, from pressure fan/or the cold wind of primary air fan 104 enter air preheater 2 after being heated.
In above-described embodiment, inferior gas energy becomes high-quality energy after replacing, and has heated electric turbine feedwater and condensate water simultaneously.; the part high-temperature flue gas of boiler export is successively by flue gas-give water-to-water heat exchanger and flue gas-condensate water heat exchanger; the feedwater of heating electric turbine and condensate water; the high-pressure heater that has reduced the high-energy quality of original heated feed water draws gas and/or has improved feed temperature; simultaneously; the low-pressure heater that has reduced the low-yield quality of original heat-setting water draws gas, and has reduced electric turbine hear rate.
In addition, utilize the exhaust steam of driving steam turbine, by driving steam turbine exhaust steam cooling system, improved and entered air preheater cold wind temperature, avoid the cold junction heated surface corrosion of air preheater.Compare with the scheme of current conventional employing steam warming machine or hot blast recirculation, the present invention is less to the negative effect of unit whole efficiency.
It is pointed out that flue gas of the present invention-can have various modification and not depart from spirit of the present invention to position and the arrangement of water-to-water heat exchanger.Referring to Fig. 3-8, feedwater flow process, flue gas-can connect with high-pressure heater to water-to-water heat exchanger, it is flue gas-be arranged in to the water-to-water heat exchanger downstream (referring to Fig. 3) of all high-pressure heaters, or flue gas-be arranged in to the water-to-water heat exchanger upstream (referring to Fig. 4) of all high-pressure heaters, or flue gas-to water-to-water heat exchanger be arranged in any two-stage high-pressure heater between (referring to Fig. 5), or several flue gases-be simultaneously arranged in above-mentioned position to water-to-water heat exchanger are set.
In addition, feedwater flow process, flue gas-give water-to-water heat exchanger also can be in parallel with high-pressure heater, i.e. after part feedwater is separated with feedwater main road, by flue gas-be heated to water-to-water heat exchanger, then converge (referring to Fig. 6) with the main road that feeds water.Burble point and point can be respectively the upstream, downstream of all high-pressure heaters or arbitrarily two-stage high-pressure heater between.Flue gas-to water-to-water heat exchanger, can be one-level, can be also some levels.In addition, from feeding water flow process, flue gas-also can and connect (referring to Fig. 7, Fig. 8) with high-pressure heater parallel connection simultaneously to water-to-water heat exchanger, flue gas-to water-to-water heat exchanger, can be one-level, can be also some levels.Flue gas-while connecting with high-pressure heater to water-to-water heat exchanger, the resistance of heat exchanger 11 can be overcome by electric turbine feed pump, also can feed water booster pump be separately set and overcome.
The position of flue gas-condensate water heat exchanger of the present invention and arrangement also can have various modification and not depart from spirit of the present invention.Referring to Fig. 9-11, condensate water flow process, flue gas-condensate water heat exchanger can be connected with low-pressure heater, it is the downstream that flue gas-condensate water heat exchanger can be arranged in all low-pressure heaters, or be arranged in the upstream of all low-pressure heaters, or be arranged in any two-stage low-pressure heater between (referring to Fig. 9), or several flue gas-condensate water heat exchangers be set be arranged in above-mentioned position simultaneously.
In addition, condensate water flow process, flue gas-condensate water heat exchanger also can be in parallel with low-pressure heater, and a part of condensate water is heated by flue gas-condensate water heat exchanger after separated with condensate water main road, then converges (referring to Figure 10) with condensate water main road.Burble point and point can be respectively the upstream, downstream of all low-pressure heaters or arbitrarily two-stage low-pressure heater between.Flue gas-condensate water heat exchanger can be one-level, can be also some levels.In addition, condensate water flow process, flue gas-condensate water heat exchanger also can and be connected with low-pressure heater parallel connection simultaneously, and flue gas-condensate water heat exchanger can be one-level (referring to Figure 11), can be also some levels.When flue gas-condensate water heat exchanger is connected with low-pressure heater, the resistance of heat exchanger can be overcome by electric turbine condensate pump, also can condensate booster pump be separately set and overcome.
And above-mentioned feedwater and condensate water can be carried out the steam turbine in this generating set, maybe can derive from other steam turbine.
In addition, on the basis of the above, can also on the hot Secondary Air of air preheater outlet, storage heater 18 be set, referring to Figure 12.Adopt electric turbine one-level to draw gas as adding hot vapour source, conventionally adopt larger the drawing gas of the degree of superheat, to heat the hot Secondary Air of air preheater outlet, its effect is further to improve boiler inlet temperature.
In addition, also can in the flue that enters flue gas-give water-to-water heat exchanger and flue gas-condensate water heat exchanger, controllable register door be set and regulate exhaust gas volumn.
In addition, above-mentioned flue gas-can mutually combine to the various arrangements of water-to-water heat exchanger, flue gas-condensate water heat exchanger, aerial cooler (embodiment illustrated in fig. 2 is one of combination) and do not depart from spirit of the present invention.Driving steam turbine exhaust steam cooling system of the present invention and generating set utilize boiler fan and primary air fan to carry out cooling to driving steam turbine exhaust steam, wind and the Secondary Air of sending into boiler are heated, and be gas energy cascade utilization by this energy replacement, be that inferior exhaust steam energy becomes high-quality energy after replacing, with heated feed water and condensate water.That is, (1) adopt primary air fan and/or pressure fan cooling to the exhaust steam of driving steam turbine by aerial cooler, wind of heating blower outlet simultaneously and/or Secondary Air.(2) the part high-temperature flue gas of boiler economizer outlet is without air preheater, and successively by flue gas-give water-to-water heat exchanger and flue gas-condensate water heat exchanger, heated feed water and condensate water, reduced the required electric turbine amount of drawing gas of high-pressure heater, improved feed temperature, meanwhile, also reduced the electric turbine amount of drawing gas that low-pressure heater draws gas required.Therefore, reduce electric turbine hear rate, reduced the coal consumption amount of fired power generating unit, the discharge capacity of minimizing fired power generating unit pollutant.
To sum up, tool of the present invention has the following advantages:
(1) take full advantage of the latent heat of vaporization in the energy of driving steam turbine exhaust steam, especially exhaust steam.
(2) driving steam turbine exhaust steam adopts cooling air mode system simple.
(3), by exhaust steam energy is replaced into gas energy, by having realized the cascade utilization of energy, improved the utilization rate of energy.
(4) improved and entered air preheater cold wind temperature, avoided the cold junction heated surface corrosion of air preheater.Compare with the scheme of current conventional employing steam warming machine or hot blast recirculation, the present invention is less to the negative effect of unit whole efficiency.
(5) adopt flue gas and condensate water, flue gas and to the mode of water direct heat-exchange, system is simple, cost is low.
(6) the electric turbine heating air preheater that draws gas exports hot Secondary Air, improves boiler inlet temperature.
Below described preferred embodiment of the present invention in detail, but it will be appreciated that, after having read above-mentioned instruction content of the present invention, those skilled in the art can make various changes or modifications the present invention.These equivalent form of values fall within the application's appended claims limited range equally.
Claims (10)
1.Yi Zhong thermal power plant driving steam turbine exhaust steam cooling system, comprises driving steam turbine, air preheater and blower fan, it is characterized in that:
Described exhaust steam cooling system also comprises aerial cooler, and described aerial cooler is by the exhaust steam of the cooling described driving steam turbine of air intake from described blower fan; And
The exhaust steam entrance of described aerial cooler is connected with the exhaust steam of described driving steam turbine outlet, and the air inlet of described aerial cooler is connected with described blower fan, and the air outlet of described aerial cooler is connected with the air inlet of described air preheater.
2. a fired power generating unit, comprise generator, electric turbine, boiler and deduster, it is characterized in that, also comprise: high-pressure heater, low-pressure heater, flue gas-to water-to-water heat exchanger and driving steam turbine exhaust steam cooling system as claimed in claim 1;
Wherein, the outlet of described boiler and described flue gas-is connected to water-to-water heat exchanger fume side, described flue gas-be connected with described high-pressure heater to water-to-water heat exchanger water side; And
A part of high-temperature flue gas of the outlet of described boiler is by described flue gas-give water-to-water heat exchanger, heated feed water.
3. fired power generating unit as claimed in claim 2, is characterized in that, also comprises:
Flue gas-condensate water heat exchanger;
Wherein, described flue gas-be connected to the outlet of water-to-water heat exchanger fume side with described flue gas-condensate water heat exchanger fume side;
The outlet of described flue gas-condensate water heat exchanger fume side is connected with the outlet of described air preheater; And
The water side of described flue gas-condensate water heat exchanger is connected with low-pressure heater, heat-setting water.
4. fired power generating unit as claimed in claim 2, it is characterized in that, feedwater flow process, described flue gas-give water-to-water heat exchanger in parallel with described high-pressure heater, after a part of feedwater is separated with feedwater main road by described flue gas-be heated to water-to-water heat exchanger, converge with feedwater main road again, burble point and point be respectively the upstream, downstream of all high-pressure heaters or arbitrarily two-stage high-pressure heater between.
5. fired power generating unit as claimed in claim 2, it is characterized in that, described flue gas-connect to water-to-water heat exchanger with described high-pressure heater, is arranged in the upstream of all high-pressure heaters or is arranged in the downstream of all high-pressure heaters or is arranged in described in any two-stage between high-pressure heater.
6. fired power generating unit as claimed in claim 3, it is characterized in that, condensate water flow process, described flue gas-condensate water heat exchanger is in parallel with described low-pressure heater, after part condensate water is separated with condensate water main road, by described flue gas-condensate water heat exchanger, be heated, converge with condensate water main road again, burble point and point be respectively the upstream, downstream of all low-pressure heaters or arbitrarily two-stage low-pressure heater between.
7. fired power generating unit as claimed in claim 3, it is characterized in that, described flue gas-condensate water heat exchanger is connected with described low-pressure heater, is arranged in the upstream of all low-pressure heaters or is arranged in the downstream of all low-pressure heaters or is arranged between any two described low-pressure heaters.
8. fired power generating unit as claimed in claim 2 or claim 3, it is characterized in that, be also included in the storage heater of arranging on the hot Secondary Air of described air preheater outlet, wherein, described storage heater adopts drawing gas as adding hot vapour source of steam turbine, to heat the hot Secondary Air of air preheater outlet.
9. fired power generating unit as claimed in claim 3, is characterized in that, on the flue that enters described flue gas-give water-to-water heat exchanger and described flue gas-condensate water heat exchanger, controllable register door is also set, and described condition baffle plate is used for regulating exhaust gas volumn.
10. fired power generating unit as claimed in claim 7, is characterized in that, is also provided with condensate booster pump, and described condensate booster pump is for overcoming the resistance of described flue gas-condensate water heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210249937.3A CN103575124A (en) | 2012-07-19 | 2012-07-19 | Steam exhaust cooling system of driving steam turbine of thermal power plant and thermal power unit |
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| CN201210249937.3A CN103575124A (en) | 2012-07-19 | 2012-07-19 | Steam exhaust cooling system of driving steam turbine of thermal power plant and thermal power unit |
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| CN103575124A true CN103575124A (en) | 2014-02-12 |
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| CN201210249937.3A Pending CN103575124A (en) | 2012-07-19 | 2012-07-19 | Steam exhaust cooling system of driving steam turbine of thermal power plant and thermal power unit |
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| CN103939935A (en) * | 2014-04-02 | 2014-07-23 | 北京龙源冷却技术有限公司 | Boiler blower inlet air heating system |
| CN105401987A (en) * | 2015-12-08 | 2016-03-16 | 广州粤能电力科技开发有限公司 | Steam-extraction superheat utilization system for double-reheat stream turbine for heating boiler secondary air |
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| CN107218591A (en) * | 2017-05-10 | 2017-09-29 | 西安西热节能技术有限公司 | A kind of externally arranged steam cooler system for heating heat primary air |
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| CN107218591B (en) * | 2017-05-10 | 2019-04-16 | 西安西热节能技术有限公司 | A kind of externally arranged steam cooler system heating heat primary air |
| CN109990616A (en) * | 2019-03-06 | 2019-07-09 | 梁新强 | A kind of Turbo-generator Set condenser water cooling becomes air-cooled system and device and method |
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