CN202673378U - Waste steam energy utilization system for driving steam turbine in thermal power plant and thermal power generating unit - Google Patents
Waste steam energy utilization system for driving steam turbine in thermal power plant and thermal power generating unit Download PDFInfo
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- CN202673378U CN202673378U CN2012203501234U CN201220350123U CN202673378U CN 202673378 U CN202673378 U CN 202673378U CN 2012203501234 U CN2012203501234 U CN 2012203501234U CN 201220350123 U CN201220350123 U CN 201220350123U CN 202673378 U CN202673378 U CN 202673378U
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Abstract
The utility model provides a waste steam energy utilization system for a driving steam turbine in a thermal power plant and a thermal power generating unit. The waste steam energy utilization system for the driving steam turbine comprises the driving steam turbine, an air preheater, a fan, a steam-water heat exchanger and an air-water heat exchanger, wherein the steam-water heat exchanger and the air-water heat exchanger form a steam-water-air heat exchange system; and waste steam in the driving steam turbine passes heats primary air and/or secondary air at the inlet of the air preheater through the steam-water-air heat exchange system. By the waste steam energy utilization system for the driving steam turbine and the thermal power generating unit, the waste steam energy of the driving steam turbine is effectively utilized, the efficiency of the thermal power plant is improved, coal consumption is reduced, and pollutant discharge is reduced.
Description
Technical field
The utility model relates to the thermal power generation field, is specifically related to that the exhaust steam energy of driving steam turbine utilizes system in the thermal power generation.
Background technique
Along with the development of national economy, society constantly improves the demand of electric power.For the new developing country that carries out industrialization and rapid economic development, such as China, the consumption of electric power and the electric motor power of power station increase rapidly.For China, owing to being subjected to the maintenance variety of its primary energy and storing quantitative limitation, the fuel of power station is about more than 70% take coal as main in recent decades, 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 are the shortcomings such as efficient is lower, pollutant emission is more in coal fired thermal power plant.Owing to being discharged into the burning that pollutant in the atmosphere derives from coal basically, thus relevant between the coal consumption amount of the discharge amount of pollutant and thermal power plant.Also reduced the discharge amount of thermal power plant's pollutant in the atmosphere when reducing the thermal power plant coal consumption.
Some rotating machinerys of thermal power plant are often driven by driving steam turbine (also claiming small turbine) by such as feed water pump, blower fan etc.In present power plant, the exhaust steam of driving steam turbine (steam discharge) enters vapour condenser by circulating water, is referred to as clammy.Also have the driving steam turbine exhaust steam of indivedual power plant to be cooled off by air cooling condenser, the employing cooling blower in atmosphere, is called the air cooling with the exhaust steam thermal release.
The existing driving steam turbine exhaust steam type of cooling, the energy in the exhaust steam is not reclaimed in clammy or air cooling.And contain a large amount of energy in the exhaust steam, and mainly be vaporization potential, if because utilizing the driving steam turbine exhaust steam energy that energy saving for power plants is brought very large benefit, improve the efficient of thermal power plant, can reduce coal consumption, reduce simultaneously the discharge amount of pollutant.
The model utility content
The purpose of this utility model provides 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 utility model provides a kind of thermal power plant driving steam turbine exhaust steam energy to utilize system, comprises driving steam turbine, air preheater and blower fan, it is characterized in that:
Described driving steam turbine exhaust steam energy utilizes system also to comprise steam-water-to-water heat exchanger and Air-Water heat exchanger, described steam-water-to-water heat exchanger and Air-Water heat exchanger consist of steam-water-wind heat-exchange system, and wind and/or the Secondary Air of described air preheater import heated in described driving steam turbine exhaust steam by described steam-water-wind heat-exchange system.
In one preferred embodiment, the exhaust steam entrance of described steam-water-to-water heat exchanger is connected with the exhaust steam of described driving steam turbine outlet, described Air-Water heat exchanger is connected with described steam-water-to-water heat exchanger by recycle pump, the intake grill of described Air-Water heat exchanger is connected with described blower fan, and the exhaust outlet of described Air-Water heat exchanger is connected with the intake grill of described air preheater.
In another preferred embodiment, the heat medium water of described steam-water-to-water heat exchanger is the water of condensation of the import or export of a low-pressure heater, and described water of condensation is behind process described steam-water-wind heat-exchange system, get back to the import or export of another low-pressure heater, and the intake grill of described Air-Water heat exchanger is connected with described blower fan, and the exhaust outlet of described Air-Water heat exchanger is connected with the intake grill of described air preheater.
In above-described embodiment, preferably, described steam-water-wind heat-exchange system is connected with low-pressure heater; Perhaps, described steam-water-wind heat-exchange system is in parallel with low-pressure heater.
In another preferred embodiment, the heat medium water of described steam-water-wind heat-exchange system is circulation independently, recycle pump is set is used for keeping the heating agent water circuit.
In another preferred embodiment, after condensing, the exhaust steam of described driving steam turbine enters vapour condenser to reclaim working medium.
In another preferred embodiment, after condensing, the exhaust steam of described driving steam turbine enters the heater of heat regenerative system to reclaim working medium and heat.
Preferably, described driving steam turbine can drive feed water pump, induced draught fan, circulating water pump, primary air fan, gas fan and condensate pump or drive the generator generating.
Preferably, the water intake of described steam-water-to-water heat exchanger is connected with the import or export of a low-pressure heater, and the water outlet of described Air-Water heat exchanger is connected with the import or export of another low-pressure heater.
Preferably, described blower fan comprises boiler fan and/or primary air fan.
The utility model 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-utilize system to water-to-water heat exchanger and above-mentioned driving steam turbine exhaust steam energy;
Wherein, the outlet of described boiler and described flue gas-is connected for the 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.
In another preferred embodiment, described fired power generating unit also comprises:
Flue gas-water of condensation heat exchanger;
Wherein, described flue gas-be connected for the outlet of water-to-water heat exchanger fume side with described flue gas-water of condensation heat exchanger fume side;
The outlet of described flue gas-water of condensation heat exchanger fume side is connected with the outlet of described air preheater; And
The water side of described flue gas-water of condensation heat exchanger is connected with low-pressure heater, heat-setting water.
In another preferred embodiment, from flue gas flow, described flue gas-give water-to-water heat exchanger in parallel with described air preheater.
In another preferred embodiment, on the feedwater flow process, described flue gas-connect for water-to-water heat exchanger with described high-pressure heater.
In another preferred embodiment, on the feedwater flow process, described flue gas-give water-to-water heat exchanger in parallel with described high-pressure heater, a part of feedwater with after the feedwater main road separates by described flue gas-be heated to water-to-water heat exchanger, converge with the feedwater main road again, between the separation point of described part feedwater and described feedwater main road and the upstream that point is respectively all high-pressure heaters, downstream or any two-stage high-pressure heater.
In another preferred embodiment, on the feedwater flow process, described flue gas-give water-to-water heat exchanger with simultaneously parallel connection of high-pressure heater and connecting.
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 between the described high-pressure heater of any two-stage to water-to-water heat exchanger.
Preferably, from flue gas flow, described flue gas-give water-to-water heat exchanger in parallel with described air preheater.
In another preferred embodiment, on the water of condensation flow process, described flue gas-water of condensation heat exchanger is connected with described low-pressure heater.
In another preferred embodiment, on the water of condensation flow process, described flue gas-water of condensation heat exchanger is in parallel with described low-pressure heater, after separating with the water of condensation main road, part water of condensation is heated by described flue gas-water of condensation heat exchanger, converge with the water of condensation main road again, the separation point of described a part of water of condensation and described water of condensation main road and point be respectively the upstream, downstream of all low-pressure heaters or arbitrarily the two-stage low-pressure heater between.
In another preferred embodiment, described flue gas-water of condensation heat exchanger and described low-pressure heater are in parallel and connect simultaneously.
In another preferred embodiment, described flue gas-water of condensation 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 also is included in the storage heater of arranging on the hot Secondary Air of described air preheater outlet, wherein, described storage heater adopts drawing gas for adding hot vapour source, with the hot Secondary Air of heating air preheater outlet of steam turbine.
In another preferred embodiment, at the entrance of the flue that enters described flue gas-water of condensation heat exchanger the controllable register door is set also, described controllable register door is used for regulating exhaust gas volumn.
In another preferred embodiment, entering the described flue gas-controllable register door also is set for the entrance of the flue of water-to-water heat exchanger and/or described flue gas-water of condensation heat exchanger, described controllable register door is used for regulating exhaust gas volumn.
In another preferred embodiment, described fired power generating unit also is provided with feed water booster pump, and described feed water booster pump is used for overcoming described flue gas-to the resistance of water-to-water heat exchanger.
In another preferred embodiment, described fired power generating unit also is provided with condensate booster pump, and described condensate booster pump is used for overcoming the resistance of described flue gas-water of condensation heat exchanger.
Preferably, 1 the above flue gas-give water-to-water heat exchanger is set in the fired power generating unit of the present utility model.
Preferably, 1 the above flue gas-water of condensation heat exchanger is set in the fired power generating unit of the present utility model.
Fired power generating unit of the present utility model is the single reheat fired power generating unit, or the double reheat fired power generating unit.
Boiler of the present utility model is coal fired boiler, or oil-fired boiler or gas fired boiler.
Feedwater of the present utility model derives from this fired power generating unit, or derives from adjacent fired power generating unit.
Water of condensation of the present utility model derives from this fired power generating unit, or derives from adjacent fired power generating unit.
Driving steam turbine exhaust steam energy of the present utility model utilizes system and generator set to utilize the driving steam turbine exhaust steam that wind and the Secondary Air of sending into air preheater (or boiler) heated, and be gas energy and cascade utilization with this energy replacement, be that inferior exhaust steam energy becomes high-quality energy after replacing, with heated feed water and water of condensation.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-water of condensation heat exchanger, heated feed water and water of condensation, reduced the required electric turbine amount of drawing gas of high-pressure heater, improved feed temperature, simultaneously, also reduced the electric turbine amount of drawing gas that low-pressure heater draws gas required.Therefore, reduce the electric turbine hear rate, reduced the coal consumption amount of fired power generating unit, the discharge amount of minimizing fired power generating unit pollutant.
To sum up, the utlity model has following advantage:
(1) takes full advantage of the latent heat of vaporization in energy, the especially exhaust steam of driving steam turbine exhaust steam.
(2) by exhaust steam energy is replaced into gas energy, by having realized the cascade utilization of energy, improved the utilization ratio of energy.
(3) improved and entered air preheater cold wind temperature, avoided the cold junction heated surface corrosion of air preheater.Compare with the employing steam warming machine of commonly using at present or the scheme of hot blast recirculation, the utility model is less to the negative effect of unit whole efficiency.
(4) adopt flue gas and water of condensation, flue gas and to the mode of water direct heat-exchange, system is simple, cost is low.
(5) mode of employing steam-water-cold wind indirect heat exchange, the heat exchange efficiency of raising heat exchanger reduces heat exchange area, reduces cost.
(6) steam-water-heat medium water of cold wind heat exchanger can be the water of condensation of electric turbine heat regenerative system.When exhaust steam energy more than boiler (by heating cold wind) during receptible energy, exhaust steam energy enters the boiler except being absorbed by cold wind, remaining energy can return by water of condensation the heat regenerative system of electric turbine, can take full advantage of exhaust steam energy.
(7) extracted steam from turbine heating air preheater exports hot Secondary Air, improves boiler inlet temperature.
Description of drawings
Fig. 1 is the system layout schematic diagram that driving steam turbine exhaust steam energy of the present utility model utilizes an embodiment of steam-water in the system-wind heat-exchange system;
Fig. 2 is the system layout schematic diagram that driving steam turbine exhaust steam energy of the present utility model utilizes another embodiment of steam-water in the system-wind heat-exchange system;
Fig. 3 adopts the driving steam turbine exhaust steam energy of Fig. 1 to utilize an embodiment's the system layout schematic diagram of the fired power generating unit of system;
Fig. 4 adopts the driving steam turbine exhaust steam energy of Fig. 2 to utilize an embodiment's the system layout schematic diagram of the fired power generating unit of system;
Fig. 5 is an embodiment's the skeleton diagram of the position of flue gas of the present utility model-give water-to-water heat exchanger;
Fig. 6 is another embodiment's the skeleton diagram of the position of flue gas of the present utility model-give water-to-water heat exchanger;
Fig. 7 is another embodiment's the skeleton diagram of the position of flue gas of the present utility model-give water-to-water heat exchanger;
Fig. 8 is another embodiment's the skeleton diagram of the position of flue gas of the present utility model-give water-to-water heat exchanger;
Fig. 9 is another embodiment's the skeleton diagram of the position of flue gas of the present utility model-give water-to-water heat exchanger;
Figure 10 is another embodiment's the skeleton diagram of the position of flue gas of the present utility model-give water-to-water heat exchanger;
Figure 11 is an embodiment's the skeleton diagram of the position of flue gas of the present utility model-water of condensation heat exchanger;
Figure 12 is another embodiment's the skeleton diagram of the position of flue gas of the present utility model-water of condensation heat exchanger;
Figure 13 is another embodiment's the skeleton diagram of the position of flue gas of the present utility model-water of condensation heat exchanger; And
Figure 14 is the skeleton diagram that an embodiment of storage heater is set on the basis of Fig. 3.
Embodiment
Below with reference to accompanying drawing preferred embodiment of the present utility model is elaborated, in order to clearlyer understand the purpose of this utility model, characteristics and advantage.It should be understood that embodiment shown in the drawings is not the restriction to the utility model scope, and just for the connotation of technical solutions of the utility model is described.Same or analogous part uses the same reference numerals to represent among the figure.
Below, major technique term of the present utility model is described.
Herein, described boiler main will comprise boiler plant.Described boiler plant is not specifically limited, and only otherwise model utility purpose of the present utility model is produced restriction to be got final product, is well known by persons skilled in the art.Can adopt π type boiler (or claiming to send the type boiler), tower boiler, inverted U boiler etc.; can be coal fired boiler, oil-fired boiler, gas fired boiler etc.; can be natural circulation boiler, forced circulation boiler, direct current cooker etc., all in protection domain of the present utility model.
Herein, described air preheater is not specifically limited, and only otherwise model utility purpose of the present utility model is produced restriction to be got final product, is well known by persons skilled in the art.Can adopt tubular preheater, rotary preheater etc., all in protection domain of the present utility model.
Herein, described deduster refers to catch the equipment of dust in the flue gas.Only otherwise model utility purpose of the present utility model is produced restriction to be got final product, be well known by persons skilled in the art.Can adopt electrical 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 domain of the present utility model.
Herein, described gas-water heat exchanger is a heat exchanger, perhaps is parallel connection, series connection, series-parallel several heat exchangers.
Herein, described Air-Water heat exchanger is a heat exchanger, perhaps is parallel connection, series connection, series-parallel several heat exchangers.
Herein, described flue gas-to water-to-water heat exchanger is a heat exchanger, perhaps is parallel connection, series connection, series-parallel several heat exchangers.
Herein, described flue gas-water of condensation heat exchanger is a heat exchanger, perhaps is parallel connection, series connection, series-parallel several heat exchangers.Herein, described blower fan is not specifically limited, and only otherwise model utility purpose of the present utility model is produced restriction to be got final product, is well known by persons skilled in the art.Can adopt centrifugal fan, axial fan etc., all in protection domain of the present utility model.
Herein, described flue gas-comprise tubular heat exchanger, plate type heat exchanger, surface-type heat exchanger, indirect-heating heat exchanger etc. to water-to-water heat exchanger, all in protection domain of the present utility model.
Herein, described flue gas-water of condensation heat exchanger comprises tubular heat exchanger, plate type heat exchanger, surface-type heat exchanger, indirect-heating heat exchanger etc., all in protection domain of the present utility model.
Herein, described gas-water heat exchanger comprises tubular heat exchanger, plate type heat exchanger, surface-type heat exchanger, indirect-heating heat exchanger etc., all in protection domain of the present utility model.
Herein, described Air-Water heat exchanger comprises tubular heat exchanger, plate type heat exchanger, surface-type heat exchanger, indirect-heating heat exchanger etc., all in protection domain of the present utility model.
Herein, described high-pressure heater refers to the heater with the heated feed water that draws gas of steam turbine, because the temperature of feedwater is high, it is also higher that it adds the energy quality that hot vapour source-turbine high-pressure draws gas.Adopt steam turbine thermodynamic cycle energy in addition to reduce this amount of drawing gas, can make the more of turbine efficiency raising.
Herein, low-pressure heater refers to the heater with the heat-setting water that draws gas of steam turbine, because the temperature of water of condensation is low, it is also lower that it adds the energy quality that hot vapour source-steam turbine low-pressure draws gas.Adopt steam turbine thermodynamic cycle energy in addition to reduce this amount of drawing gas, can make the less of turbine efficiency raising.
Herein, driving steam turbine refers to for some rotating machinerys that drive thermal power plant, such as the steam turbine of feed water pump, induced draught fan etc., also can drive the generator generating.The effect of this steam turbine is the power that rotation is provided to water pump, induced draught fan etc., and it is different from the steam turbine of thermal power plant's Turbo-generator Set, usually is also referred to as small turbine.
Herein, the driving steam turbine exhaust steam refers to the steam discharge after steam enters driving steam turbine acting, in the literary composition referred to as exhaust steam.
Below describe mode of execution of the present utility model in detail.Fig. 1 is the system layout schematic diagram that driving steam turbine exhaust steam energy of the present utility model utilizes an embodiment of system.As shown in Figure 1, the driving steam turbine exhaust steam energy utilizes in the system, at first pass through steam-water-to-water heat exchanger 102 by driving steam turbine 101 exhaust steam out that is used for driving such as the driven equipments such as pump 105, the exhaust steam entrance of steam-water-to-water heat exchanger 102 is connected with the exhaust steam of driving steam turbine 101 outlet, and the exhaust steam outlet of steam-water-to-water heat exchanger 102 is connected with electric turbine condenser 103.The water intake of steam-water-to-water heat exchanger is connected with Air-Water heat exchanger 106 by recycle pump 107, and the water outlet of steam-water-to-water heat exchanger 102 also is connected with Air-Water heat exchanger 106.Thus, heat medium water circulates between steam-water-to-water heat exchanger 102 and Air-Water heat exchanger 106 by recycle pump 107.Steam-water-to-water heat exchanger 102 and Air-Water heat exchanger 106 consist of steam-water-wind heat-exchange system together.
The intake grill of Air-Water heat exchanger 106 is connected with gas fan and/or primary air fan 104, and the exhaust outlet of Air-Water heat exchanger 106 leads to air preheater 2.
By this steam-water-wind heat-exchange system, after the exhaust steam of driving steam turbine 101 enters steam-water-to-water heat exchanger 102, cooled off from the relatively low heat medium water of the temperature of Air-Water heat exchanger, exhaust steam enters the vapour condenser 103 of electric turbine to reclaim working medium (as shown in Figure 1) after supercooling condenses into water, also can get back to the heater of heat regenerative system to reclaim working medium and heat according to condensing water temperature.
Simultaneously, from the relatively low heat medium water of the temperature of Air-Water heat exchanger 106 in steam-water-to-water heat exchanger 102 by after the exhaust steam heating from driving steam turbine 101, the heat medium water that the temperature after the heating is higher is got back to again Air-Water heat exchanger 106.At this moment, after entering Air-Water heat exchanger 106 from the cold wind of gas fan and/or primary air fan 104, by the higher heat medium water heating of above-mentioned temperature, the simultaneously heat medium water cooling that this temperature is higher, be circulated back to steam-water-to-water heat exchanger by the cooled heat medium water of cold wind by recycle pump 107, so circulation consists of steam-water-wind heat-exchange system.
From the wind of gas fan and/or primary air fan 104 by steam-water-wind heat-exchange system heating after, enter air preheater 2, as wind and the Secondary Air of air preheater 2 imports.Thus, than existing fired power generating unit, wind of air preheater 2 imports and the temperature of Secondary Air improve.In other words, wind and the Secondary Air of air preheater 2 imports have been heated from the exhaust steam of driving steam turbine 101.Thereby and burner air intake (instant heating Secondary Air) temperature and coal pulverizer air intake (being heat primary air) temperature have been improved.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 the existing thermal power plant, therefore the normal flue gas that adopts from boiler export of wind of air preheater 2 imports and Secondary Air, needs to consume the gas energy of a part.Yet, since the flue-gas temperature of boiler export up to 350～400 ℃ about, therefore it also can be used to heat feedwater and the water of condensation of higher temperature, therefore wishes to reduce wind being used for heating the air preheater import in the flue gas of boiler export and the exhaust gas volumn of Secondary Air as far as possible.And in the utility model, by above-mentioned steam-water-wind heat-exchange system, utilize wind and the Secondary Air of exhaust steam heating air preheater 2 imports of driving steam turbine 101, greatly reduced thus wind being used for heating the air preheater import and the exhaust gas volumn of Secondary Air.
It is pointed out that in above-mentioned steam-water-wind heat-exchange system, can be circulation independently as the heat medium water of heat catalysis, is overcome the resistance of water by recycle pump, as shown in Figure 1.Also can be by the water of condensation in the electric turbine thermodynamic system as heat medium water, as shown in Figure 2.
Exhaust steam energy when Fig. 2 illustrates with water of condensation as heat medium water utilizes an embodiment's of system system layout schematic diagram.As shown in Figure 2, cancelled recycle pump in the present embodiment, water of condensation can be drawn from certain one-level low-pressure heater 15 import or export, and namely the water intake of steam-water-to-water heat exchanger is connected with the import or export of certain one-level low-pressure heater 15.Behind steam-water-to-water heat exchanger 102 and Air-Water heat exchanger 106, get back to certain one-level low-pressure heater import or export, the outlet that is the Air-Water heat exchanger is connected with the import or export of certain one-level low-pressure heater 15, and the exhaust steam energy of driving steam turbine 101 has passed to the cold wind from gas fan and primary air fan 104 simultaneously.
With water of condensation during as heat medium water, can be whole condensing water flows as the condensing water flow of heat medium water, at this moment, steam-water-to-water heat exchanger 102 and Air-Water heat exchanger 106 are to connect with the pass of low-pressure heater 15.Perhaps, the condensing water flow that is used as heat medium water can be the part of total condensing water flow, and at this moment, steam-water-to-water heat exchanger 102 and Air-Water heat exchanger 106 are in parallel with the pass of low-pressure heater 15.
In above-described embodiment, because the cold wind of air preheater 2 imports can be by driving steam turbine exhaust steam heating, greatly reduced the amount of the boiler export high-temperature flue gas that is used for heating in the air preheater 2 wind and Secondary Air in the prior art.Therefore, the high-temperature flue gas that displaces can be used to heat feedwater and the water of condensation in the fired power generating unit.
Fig. 3-14 illustrates the structural layout plan that the boiler export flue gas that displaces is used for the embodiment of the feedwater of heating fired power generating unit and water of condensation.Referring to Fig. 3, shown in Fig. 3 is in steam-water-wind heat-exchange system, be independently during circulation as the heat medium water of heat catalysis, the boiler export flue gas that displaces is used for an embodiment's of the feedwater of heating fired power generating unit and water of condensation structural layout plan.
As shown in Figure 3, fired power generating unit comprises: boiler 1, air preheater 2, deduster 3, gas fan/primary air fan 104, flue gas-give water-to-water heat exchanger 11, flue gas-water of condensation 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.
Driving steam turbine 101 exhaust steam out is at first by steam-water-to-water heat exchanger 102, and the exhaust steam entrance of steam-water-to-water heat exchanger 102 is connected with the exhaust steam of driving steam turbine 101 outlet, and the exhaust steam outlet of steam-water-to-water heat exchanger 102 is connected with electric turbine condenser 103.The water intake of steam-water-to-water heat exchanger is connected with Air-Water heat exchanger 106 by recycle pump 107, and the water outlet of steam-water-to-water heat exchanger 102 also is connected with Air-Water heat exchanger 106.Thus, heat medium water circulates between steam-water-to-water heat exchanger 102 and Air-Water heat exchanger 106 by recycle pump 107.Steam-water-to-water heat exchanger 102, recycle pump 107 and Air-Water heat exchanger 106 consist of steam-water-wind heat-exchange system together.The intake grill of Air-Water heat exchanger 106 is connected with gas fan and/or primary air fan 104, and the exhaust outlet of Air-Water heat exchanger 106 leads to air preheater 2, and the wind after being heated is as wind and the Secondary Air of air preheater 2 imports.
The outlet of boiler 1 is connected with flue gas with air preheater 2 simultaneously and is connected to water-to-water heat exchanger 11.Flue gas-give water-to-water heat exchanger 11 and flue gas-water of condensation heat exchanger 12 are connected with high-pressure heater and are connected.Flue gas-water of condensation heat exchanger 12 is connected with low-pressure heater with the outlet of air preheater 2 and is connected.
The outlet of flue gas-be connected to boiler 1 for 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.On the feedwater flow process, flue gas-give water-to-water heat exchanger 11 in parallel with high-pressure heater 13, i.e. part feedwater with after the feedwater main road separates by flue gas-be heated to water-to-water heat exchanger 11, converge with the main road that feeds water again.Separation point and point can be respectively the upstream, downstream of all high-pressure heaters or arbitrarily the two-stage high-pressure heater between.Flue gas-to water-to-water heat exchanger is one-level, but also can be multistage.
Flue gas is through behind the flue gas-give water-to-water heat exchanger 11, and by flue gas-water of condensation heat exchanger 12 heat-setting water, flue gas-water of condensation 12 is connected with low-pressure heater 15 from the flue gas of flue gas-give water-to-water heat exchanger 11 outlets.In the present embodiment, on the water of condensation flow process, flue gas-water of condensation heat exchanger 12 is in parallel with low-pressure heater 15, is heated by flue gas-water of condensation heat exchanger after namely a part of water of condensation is separated with the water of condensation main road, converges with the water of condensation main road again.Separation point and point can be respectively the upstream, downstream of all low-pressure heaters or arbitrarily the two-stage low-pressure heater between.Flue gas-water of condensation heat exchanger is one-level, but also can be multistage.
Flue gas mixes with the flue gas of air preheater 2 outlets from the flue gas that flue gas-water of condensation heat exchanger 12 exports through behind flue gas-water of condensation heat exchanger 12.After two strands of above-mentioned flue gases mix, through deduster 3, then enter desulfuration absorbing tower.
The exhaust steam of driving steam turbine 101 is by behind steam-water-wind heat-exchange system, and by the cold wind cooling from gas fan and/or primary air fan 104, exhaust steam enters the vapour condenser 103 of electric turbine 16 to reclaim working medium after supercooling condenses into water.Simultaneously, from gas 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 simultaneously electric turbine feedwater and water of condensation.Namely, the part high-temperature flue gas of boiler export is successively by flue gas-give water-to-water heat exchanger and flue gas-water of condensation heat exchanger, the feedwater of heating electric turbine and water of condensation, 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 the electric turbine hear rate.
In addition, utilize the exhaust steam of driving steam turbine, utilize system to improve by the driving steam turbine exhaust steam energy and enter air preheater cold wind temperature, avoid the cold junction heated surface corrosion of air preheater.Compare with the employing steam warming machine of commonly using at present or the scheme of hot blast recirculation, the utility model is less to the negative effect of unit whole efficiency.
Fig. 4 illustrates in steam-water-wind heat-exchange system, and by the water of condensation in the electric turbine thermodynamic system during as heat medium water, the boiler export flue gas that displaces is used for an embodiment's of the feedwater of heating fired power generating unit and water of condensation structural layout plan.Be referring to embodiment's difference shown in Figure 3 with above-mentioned, heat medium water in steam-water-wind heat-exchange system is the water of condensation of drawing from certain one-level low-pressure heater 15 import or export, and this heat medium water (or water of condensation) is got back to certain one-level low-pressure heater import or export behind process steam-water-to-water heat exchanger 102 and Air-Water heat exchanger 106.All the other are identical, therefore be not described in detail in this.
It is pointed out that flue gas of the present utility model-various modification can be arranged and do not break away from spirit of the present utility model for position and the arrangement of water-to-water heat exchanger.Below with in steam-water-wind heat-exchange system, be in the situation of independently circulation as the heat medium water of heat catalysis, flue gas-to the position of water-to-water heat exchanger and the various embodiments of arrangement is described.In steam-water-wind heat-exchange system, in the situation of the water of condensation in the fired power generating unit as heat medium water, the position of flue gas-give water-to-water heat exchanger and arrangement and heat medium water as heat catalysis are that the situation of independently circulation is identical, are not described in detail in this.
Referring to Fig. 5-10, on the feedwater flow process, flue gas-can connect with high-pressure heater for water-to-water heat exchanger, it is flue gas-be arranged in to the water-to-water heat exchanger downstream (referring to Fig. 5) of all high-pressure heaters, perhaps flue gas-be arranged in to the water-to-water heat exchanger upstream (referring to Fig. 6) of all high-pressure heaters, perhaps flue gas-to water-to-water heat exchanger be arranged in any two-stage high-pressure heater between (referring to Fig. 7), several flue gases-be arranged in simultaneously in the above-mentioned position to water-to-water heat exchanger perhaps are set.
In addition, on the feedwater flow process, flue gas-give water-to-water heat exchanger also can be in parallel with high-pressure heater, i.e. part feedwater with after the feedwater main road separates by flue gas-be heated to water-to-water heat exchanger, converge (referring to Fig. 8) with the main road that feeds water again.Separation point and point can be respectively the upstream, downstream of all high-pressure heaters or arbitrarily the two-stage high-pressure heater between.Flue gas-give water-to-water heat exchanger can be one-level, also can be some levels.In addition, on the feedwater flow process, flue gas-give water-to-water heat exchanger also can be in parallel and connect (referring to Fig. 9, Figure 10) simultaneously with high-pressure heater, and flue gas-give water-to-water heat exchanger can be one-level, also can be some grades.Flue gas-when connecting for water-to-water heat exchanger with high-pressure heater, the resistance of heat exchanger 11 can be overcome by the electric turbine feed water pump, also can feed water booster pump be set in addition and overcome.
The position of flue gas of the present utility model-water of condensation heat exchanger and arrangement also can have various modification and not break away from spirit of the present utility model.Referring to Figure 11-13, on the water of condensation flow process, flue gas-water of condensation heat exchanger can be connected with low-pressure heater, be that flue gas-water of condensation heat exchanger can be arranged in the downstream of all low-pressure heaters, perhaps be arranged in the upstream of all low-pressure heaters, perhaps be arranged in any two-stage low-pressure heater between (referring to Figure 11), several flue gases-water of condensation heat exchanger perhaps is set is arranged in simultaneously in the above-mentioned position.
In addition, on the water of condensation flow process, flue gas-water of condensation heat exchanger also can be in parallel with low-pressure heater, is heated by flue gas-water of condensation heat exchanger after namely a part of water of condensation is separated with the water of condensation main road, converges (referring to Figure 12) with the water of condensation main road again.Separation point and point can be respectively the upstream, downstream of all low-pressure heaters or arbitrarily the two-stage low-pressure heater between.Flue gas-water of condensation heat exchanger can be one-level, also can be some levels.In addition, on the water of condensation flow process, flue gas-water of condensation heat exchanger also can and be connected with simultaneously parallel connection of low-pressure heater, and flue gas-water of condensation heat exchanger can be one-level (referring to Figure 13), also can be some levels.Flue gas-when the water of condensation heat exchanger was connected with low-pressure heater, the resistance of heat exchanger can be overcome by the electric turbine condensate pump, also can condensate booster pump be set in addition and overcome.
In addition, on the basis of the above, can also storage heater 18 be set at the hot Secondary Air of air preheater outlet, referring to Figure 14.Adopt the electric turbine one-level to draw gas as adding hot vapour source, usually adopt larger the drawing gas of the degree of superheat, with the hot Secondary Air of heating 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-water of condensation heat exchanger, the controllable register door be set and regulate exhaust gas volumn.
In addition, above-mentioned flue gas-can mutually make up for the various arrangements of water-to-water heat exchanger, flue gas-water of condensation heat exchanger, Air-Water heat exchanger (embodiment illustrated in fig. 3 is one of combination) and do not break away from spirit of the present utility model.
Driving steam turbine exhaust steam energy of the present utility model utilizes system and generator set to utilize the driving steam turbine exhaust steam that wind and the Secondary Air of sending into air preheater (or boiler) heated, and be gas energy and cascade utilization with this energy replacement, be that inferior exhaust steam energy becomes high-quality energy after replacing, with heated feed water and water of condensation.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-water of condensation heat exchanger, heated feed water and water of condensation, reduced the required electric turbine amount of drawing gas of high-pressure heater, improved feed temperature, simultaneously, also reduced the electric turbine amount of drawing gas that low-pressure heater draws gas required.Therefore, reduce the electric turbine hear rate, reduced the coal consumption amount of fired power generating unit, the discharge amount of minimizing fired power generating unit pollutant.
To sum up, the utlity model has following advantage:
(1) takes full advantage of the latent heat of vaporization in energy, the especially exhaust steam of driving steam turbine exhaust steam.
(2) by exhaust steam energy is replaced into gas energy, by having realized the cascade utilization of energy, improved the utilization ratio of energy.
(3) improved and entered air preheater cold wind temperature, avoided the cold junction heated surface corrosion of air preheater.Compare with the employing steam warming machine of commonly using at present or the scheme of hot blast recirculation, the utility model is less to the negative effect of unit whole efficiency.
(4) adopt flue gas and water of condensation, flue gas and to the mode of water direct heat-exchange, system is simple, cost is low.
(5) mode of employing steam-water-cold wind indirect heat exchange, the heat exchange efficiency of raising heat exchanger reduces heat exchange area, reduces cost.
(6) steam-water-heat medium water of cold wind heat exchanger can be the water of condensation of electric turbine heat regenerative system.When exhaust steam energy more than boiler (by heating cold wind) during receptible energy, exhaust steam energy enters the boiler except being absorbed by cold wind, remaining energy can return by water of condensation the heat regenerative system of electric turbine, can take full advantage of exhaust steam energy.
(7) extracted steam from turbine heating air preheater exports hot Secondary Air, improves boiler inlet temperature.
Below described preferred embodiment of the present utility model in detail, but it will be appreciated that, after having read above-mentioned instruction content of the present utility model, those skilled in the art can make various changes or modifications the utility model.These equivalent form of values fall within the application's appended claims limited range equally.
Claims (10)
1. thermal power plant's driving steam turbine exhaust steam energy utilizes system, comprises driving steam turbine, air preheater and blower fan, it is characterized in that:
Described driving steam turbine exhaust steam energy utilizes system also to comprise steam-water-to-water heat exchanger and Air-Water heat exchanger, described steam-water-to-water heat exchanger and Air-Water heat exchanger consist of steam-water-wind heat-exchange system, and wind and/or the Secondary Air of described air preheater import heated in described driving steam turbine exhaust steam by described steam-water-wind heat-exchange system.
2. driving steam turbine exhaust steam energy as claimed in claim 1 utilizes system, it is characterized in that, the exhaust steam entrance of described steam-water-to-water heat exchanger is connected with the exhaust steam of described driving steam turbine outlet, described Air-Water heat exchanger is connected with described steam-water-to-water heat exchanger by recycle pump, and the intake grill of described Air-Water heat exchanger is connected with described blower fan, and the exhaust outlet of described Air-Water heat exchanger is connected with the intake grill of described air preheater.
3. driving steam turbine exhaust steam energy as claimed in claim 1 utilizes system, it is characterized in that, the heat medium water of described steam-water-to-water heat exchanger is the water of condensation of the import or export of a low-pressure heater, described water of condensation is behind process described steam-water-wind heat-exchange system, get back to the import or export of another low-pressure heater, and the intake grill of described Air-Water heat exchanger is connected with described blower fan, and the exhaust outlet of described Air-Water heat exchanger is connected with the intake grill of described air preheater.
4. driving steam turbine exhaust steam energy as claimed in claim 3 utilizes system, it is characterized in that, the water intake of described steam-water-to-water heat exchanger is connected with the import or export of a low-pressure heater, and the water outlet of described Air-Water heat exchanger is connected with the import or export of another low-pressure heater.
5. 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-utilize system to water-to-water heat exchanger and such as each described driving steam turbine exhaust steam energy among the claim 1-4;
Wherein, the outlet of described boiler and described flue gas-is connected for the 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.
6. fired power generating unit as claimed in claim 5 is characterized in that, also comprises:
Flue gas-water of condensation heat exchanger;
Wherein, described flue gas-be connected for the outlet of water-to-water heat exchanger fume side with described flue gas-water of condensation heat exchanger fume side;
The outlet of described flue gas-water of condensation heat exchanger fume side is connected with the outlet of described air preheater; And
The water side of described flue gas-water of condensation heat exchanger is connected with low-pressure heater, heat-setting water.
7. fired power generating unit as claimed in claim 5, it is characterized in that, described flue gas-to water-to-water heat exchanger is arranged in the upstream of all high-pressure heaters or is arranged in the downstream of all high-pressure heaters or is arranged between the described high-pressure heater of any two-stage or with high-pressure heater and is arranged in parallel.
8. fired power generating unit as claimed in claim 6, it is characterized in that, described flue gas-water of condensation 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 or with low-pressure heater and is arranged in parallel.
9. fired power generating unit as claimed in claim 5, it is characterized in that, also be included in the storage heater of arranging on the hot Secondary Air of described air preheater outlet, wherein, described storage heater adopts drawing gas for adding hot vapour source, with the hot Secondary Air of heating air preheater outlet of steam turbine.
10. fired power generating unit as claimed in claim 5 is characterized in that, is entering the described flue gas-controllable register door also is set for the entrance of the flue of water-to-water heat exchanger, and described controllable register door is used for regulating exhaust gas volumn.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012203501234U CN202673378U (en) | 2012-07-19 | 2012-07-19 | Waste steam energy utilization system for driving steam turbine in thermal power plant and thermal power generating unit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012203501234U CN202673378U (en) | 2012-07-19 | 2012-07-19 | Waste steam energy utilization system for driving steam turbine in thermal power plant and thermal power generating unit |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103134043A (en) * | 2013-01-29 | 2013-06-05 | 北京源深节能技术有限责任公司 | Boiler system with U-shaped flue and boiler water charging system |
| CN103573311A (en) * | 2012-07-19 | 2014-02-12 | 中国电力工程顾问集团华东电力设计院 | Steam exhaust energy utilizing system of driving steam turbine of thermal power plant and thermal power unit |
| CN104329127A (en) * | 2014-11-10 | 2015-02-04 | 中国电力工程顾问集团华东电力设计院 | Multi-unit combination expansion system |
| CN105889897A (en) * | 2016-01-29 | 2016-08-24 | 中国电力工程顾问集团西北电力设计院有限公司 | Comprehensive recycling system and method of waste heat in thermal power plant |
| CN106196147A (en) * | 2016-08-18 | 2016-12-07 | 北京慧峰仁和科技股份有限公司 | A kind of exhaust steam residual heat that reclaims improves the thermal efficiency and the system of unit on-load ability |
| CN112160807A (en) * | 2020-08-25 | 2021-01-01 | 光大环境科技（中国）有限公司 | Incineration power generation system |
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2012
- 2012-07-19 CN CN2012203501234U patent/CN202673378U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103573311A (en) * | 2012-07-19 | 2014-02-12 | 中国电力工程顾问集团华东电力设计院 | Steam exhaust energy utilizing system of driving steam turbine of thermal power plant and thermal power unit |
| CN103573311B (en) * | 2012-07-19 | 2016-05-18 | 中国电力工程顾问集团华东电力设计院有限公司 | Thermal power plant's driving steam turbine exhaust steam energy utilizes system and fired power generating unit |
| CN103134043A (en) * | 2013-01-29 | 2013-06-05 | 北京源深节能技术有限责任公司 | Boiler system with U-shaped flue and boiler water charging system |
| CN103134043B (en) * | 2013-01-29 | 2015-04-08 | 北京源深节能技术有限责任公司 | Boiler system with U-shaped flue and boiler water charging system |
| CN104329127A (en) * | 2014-11-10 | 2015-02-04 | 中国电力工程顾问集团华东电力设计院 | Multi-unit combination expansion system |
| CN104329127B (en) * | 2014-11-10 | 2016-03-30 | 中国电力工程顾问集团华东电力设计院有限公司 | Multicomputer associating capacity-enlarging system |
| CN105889897A (en) * | 2016-01-29 | 2016-08-24 | 中国电力工程顾问集团西北电力设计院有限公司 | Comprehensive recycling system and method of waste heat in thermal power plant |
| CN105889897B (en) * | 2016-01-29 | 2018-02-16 | 中国电力工程顾问集团西北电力设计院有限公司 | A kind of thermal power plant residual heat integrative recycling system and method |
| CN106196147A (en) * | 2016-08-18 | 2016-12-07 | 北京慧峰仁和科技股份有限公司 | A kind of exhaust steam residual heat that reclaims improves the thermal efficiency and the system of unit on-load ability |
| CN112160807A (en) * | 2020-08-25 | 2021-01-01 | 光大环境科技（中国）有限公司 | Incineration power generation system |
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