CN102032612A - Cogeneration energy-saving device and method using residual heat of direct air-cooling unit to supply heat - Google Patents

Cogeneration energy-saving device and method using residual heat of direct air-cooling unit to supply heat Download PDF

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Publication number
CN102032612A
CN102032612A CN2010105273562A CN201010527356A CN102032612A CN 102032612 A CN102032612 A CN 102032612A CN 2010105273562 A CN2010105273562 A CN 2010105273562A CN 201010527356 A CN201010527356 A CN 201010527356A CN 102032612 A CN102032612 A CN 102032612A
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China
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heat
water
steam
heat pump
condenser
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CN2010105273562A
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Chinese (zh)
Inventor
黄进
向文国
王忠渠
刘建民
刘宏庆
李永生
徐则林
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Energy-Saving Technology Co Ltd Of Beijing National Electricity Science & Technology Institute
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Energy-Saving Technology Co Ltd Of Beijing National Electricity Science & Technology Institute
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Publication of CN102032612A publication Critical patent/CN102032612A/en
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/14Combined heat and power generation [CHP]
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/16Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00Climate change mitigation technologies for sector-wide applications
    • Y02P80/10Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
    • Y02P80/15On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply

Abstract

The invention relates to cogeneration energy-saving device and method using the residual heat of a direct air-cooling unit to supply heat. The device comprises a turbine, a deaerator and an air cooling tower and also comprises a residual-heat utilization hot-water heater which comprises an absorption heat pump, a heat exchanger and a condenser, wherein a waste steam outlet of the turbine is respectively connected with a waste steam outlet of the air cooling tower and a waste steam outlet of the condenser through steam exhaust cylinders, and a condensed water outlet of the condenser is connected with a water storage tank of the air cooling tower; a steam outlet of the absorption heat pump is connected with a steam extraction port of the turbine, a water inlet end of the absorption heat pump is connected with a water return end of a hot water pipe network, and the absorption heat pump is connected with the condenser in a closed loop to for a circulating water system; a steam inlet of the heat exchanger is connected with the steam extraction port of the turbine, a water inlet end of the heat exchanger is connected with a water outlet end of the absorption heat pump, and a water outlet end of the heat exchanger is connected with a water inlet end of the hot water pipe network; and the drain water of the heat exchanger and the drain water of the absorption heat pump are converged and connected with the deaerator. The invention can decrease cold source loss, increase comprehensive heat efficiency and electricity-heat ratio and reduce generation coal consumption of the unit.

Description

Utilize the cogeneration of heat and power energy saver and the method for the heat supply of Direct Air-cooled Unit waste heat
Technical field
The invention belongs to energy technology field, relate to a kind of device and power-economizing method thereof that utilizes the heat supply of Direct Air-cooled Unit waste heat, reduces the unit generation coal consumption.
Background technology
The year two thousand twenty; China will double realization economy with the energy and turn over two times; if but by present energy growth trend, China's energy consumption will all can bring serious problem at aspects such as energy supply and energy security and environmental protection up to more than 40 hundred million tons of standard coals till that time.
Cogeneration of heat and power is a kind of generally acknowledged power-saving technology, with the cogeneration of heat and power of coal-fired mode and thermoelectric divide to produce compare, with the heating power and the electric power of output equal number, the cogeneration of heat and power mode can be divided than thermoelectricity and produced the fire coal that can save about 1/3.According to a preliminary estimate, but the present standard coal of cogeneration of heat and power energy savings in every year more than 3,000 ten thousand tons of China reduces more than 6,500 ten thousand tons of CO2 emissions, reduces 600,000 tons of sulfur dioxide (SO2) emissions, reduces lime-ash and discharges 1,300 ten thousand tons.
Conventional power plant is in power generation process, finishing the exhaust steam of merit cools off in condenser, a large amount of heats are taken away by environment, and be in power generation process, a part of heat energy to be transported to huge numbers of families by pipeline as the typical steam power plant of cogeneration of heat and power, the chemical energy that fuel combustion is produced is converted into the high-grade electric energy, simultaneously the process that is used for generating back residual low grade heat energy.In this process, steam power plant's heating efficiency is higher than conventional power plant far away.Cogeneration of heat and power can utilize the heat energy classification of different grades, and promptly high-grade heat energy is used for generating, and low-grade heat energy is used for central heating.Be a kind of high efficient energy sources mode of production of heat energy and electric energy Joint Production, its thermal efficiency can reach 80-90%.Divide product to compare with thermoelectricity, it is low that the cogeneration of heat and power central heating has energy consumption, and characteristics such as good economy performance all have clear superiority in resource distribution and environmental protection.Facts have proved that cogeneration of heat and power is the important measures that improve energy utilization rate.Therefore, the Chinese government has classified cogeneration of heat and power as one of China's ten big energy conservation projects, is the effective way that solves concentrated supply of heating in the city and improve power plant's comprehensive utilization of energy rate.
China's water resource distributes from the area, it is few to present Dong Duoxi, the situation that Nan Duobei is few, the Yangtze river basin and areas to the south's water resource thereof account for 81% of the whole nation, and population accounts for the whole nation 46% northern water resource and only accounts for 19%, along with the minimizing and the irrational development and use of water resource of precipitation in recent years, lack of water contradiction manifests day by day.According to the overall goal requirement of " 12 " water-saving construction, by 2015, national water consumption did not break through 6,200 hundred million m 3, 30%, ten thousand yuan of industrial added value water consumption of ten thousand yuan of GDP water consumptions decline descends 30%.If power plant adopts conventional water-cooling system, this cooling system water consumption accounts for 65% of full factory water consumption, in the deficient relatively north of water resource, the phenomenon of striving water with other departments of national economy will occur.Along with continuous advancement in technology, air cooling technique has been alleviated above-mentioned pressure to a certain extent.
The latent heat of vaporization that steam (exhaust steam) is emitted when condenser condenses is passed to cooling water or is directly passed to air and take away by heat exchanger tube, finally is discharged in the environment.For Direct Air-cooled Unit,, rely on the height of air cooling tower body of the tower and extraneous mechanical power to drive blower fan as the air of cooling medium, flowing from bottom to top, absorb steam turbine and be discharged to exhaust steam latent heat in the air cooling tower heat exchanger, exhaust steam is condensed into water, the elegant loss of the recirculated water that does not have the water-cooled unit to cause.But this part finally is discharged in the atmosphere by the exhaust steam heat that air is taken away, and belongs to " discarded and utilizable Lowlevel thermal energy " always.
Enterprises such as cogeneration of heat and power power generation and heat supply are discharged into this part available discarded waste heat in the surrounding environment (atmosphere) in vain by existing technology.By measuring and calculating, a 300MW eHeat supply 180t/h cogeneration of heat and power air cooling heat supply unit is per hour discharged and can be utilized waste heat 200,000,000 much cards.
How according to heat supply (particularly municipal heating systems) and in conjunction with the operating condition of Direct Air-cooled Unit, reclaim the needs that these discarded heat energy satisfy heat supply, reaching energy-conservation effect is purpose of the present invention.
Summary of the invention
Technology of the present invention is dealt with problems and is: overcome the deficiencies in the prior art, a kind of cogeneration of heat and power energy saver and method of utilizing the heat supply of Direct Air-cooled Unit waste heat is provided, and the present invention can reduce cold source energy, raising integrated heat efficiency and electric heating proportion, the coal consumption of reduction unit generation.
Technical solution of the present invention is:
The cogeneration of heat and power energy saver that utilizes the heat supply of Direct Air-cooled Unit waste heat provided by the invention, comprise steam turbine, oxygen-eliminating device and air cooling tower, the exhaust steam outlet of described steam turbine is connected with described air cooling tower by exhaust casing, this device also comprises the UTILIZATION OF VESIDUAL HEAT IN hot-water heater, described UTILIZATION OF VESIDUAL HEAT IN hot-water heater comprises absorption heat pump, heat exchanger and condenser, the exhaust steam outlet of described steam turbine also is connected with the exhaust steam import of described condenser by described exhaust casing, and the condensate water outlet of described condenser is connected with the water storage tank of described air cooling tower by pipeline; The steam inlet of described absorption heat pump is connected with the extraction opening of described steam turbine by pipeline, the water inlet end of described absorption heat pump is connected with the backwater end of hot water pipe net by pipeline, and described absorption heat pump and described condenser are by the closed circuit circulation that is connected to form of pipeline; The steam inlet of described heat exchanger is connected with the extraction opening of described steam turbine by pipeline, and the water inlet end of described heat exchanger is connected with the water side of described absorption heat pump by pipeline, and the water side of described heat exchanger is connected with the water inlet end of hot water pipe net by pipeline; The hydrophobic back of converging of the hydrophobic and described absorption heat pump of described heat exchanger is connected with described oxygen-eliminating device.
The cogeneration of heat and power power-economizing method that utilizes the heat supply of Direct Air-cooled Unit waste heat provided by the invention may further comprise the steps:
A, steam turbine enter air cooling tower by exhaust casing with part or all of exhaust steam, and exhaust steam by the lower atmosphere cooling of temperature, forms the water storage tank that condensate water is sent into air cooling tower after the condensation in air cooling tower;
B, steam turbine enter condenser by exhaust casing with part or all of exhaust steam, absorption heat pump and condenser are by the closed circuit circulation that is connected to form of pipeline, exhaust steam is cooled off by the recirculated water between absorption heat pump and the condenser in condenser, form the water storage tank that condensate water is sent into described air cooling tower after the condensation, exhaust steam simultaneously is with the recirculated water heat temperature raising;
C, be transported in the described absorption heat pump by the backwater of pipeline with hot water pipe net, water inlet as absorption heat pump, described absorption heat pump is by the driving of drawing gas of described steam turbine, and utilize heat in the recirculated water that described condenser sends here jointly to the water inlet heating, described absorption heat pump will lose the recirculated water of heat and deliver to described condenser, and heated hot water sent into by pipeline further be heated to the temperature that needs in the heat exchanger, the high-temperature-hot-water after described heat exchanger will heat up is delivered to the water inlet end of hot water pipe net;
The steam that D, described steam turbine are extracted out is divided into two strands, one enters described absorption heat pump, as driving steam, another thigh enters described heat exchanger, as the further thermal source that heats up of hot water, it is hydrophobic that two strands of steam condenses into after described absorption heat pump and described heat exchanger heat exchange, and two-way is hydrophobic sends into oxygen-eliminating device after converging.
Further, (1) if the water temperature of described heat exchanger water side less than design temperature, the amount of drawing gas of steam turbine and the exhaust steam inlet flow rate of described condenser are stated in the steam inlet place that then at first increases described absorption heat pump, and the amount of drawing gas of steam turbine is stated in next steam inlet place that increases described heat exchanger; (2) if the water temperature of described heat exchanger water side greater than design temperature, the amount of drawing gas of steam turbine is stated in the steam inlet place of then at first reducing described heat exchanger, and next reduces the steam inlet place of described absorption heat pump and states the amount of drawing gas of steam turbine and the exhaust steam inlet flow rate of described condenser.
The present invention compared with prior art has following advantage:
(1) the present invention replaces surface-type heat exchangers for district heating of the prior art by the UTILIZATION OF VESIDUAL HEAT IN hot-water heater, circulation between increase absorption heat pump and the condenser and the discharge exhaust steam between steam turbine and the condenser utilize pipeline, the UTILIZATION OF VESIDUAL HEAT IN hot-water heater has utilized steam turbine to discharge the backwater heating of the heat of exhaust steam to heating network (also hot water pipe network) indirectly, backwater after will heating is again sent heating network back to, and then the outside heat supply of heating network.Not only effectively utilize the heat in the exhaust steam, and reduced the heat transfer irreversible loss that the temperature difference of backwater in heating steam and the heating network causes.
(2) absorption heat pump in the UTILIZATION OF VESIDUAL HEAT IN hot-water heater of the present invention is by the steam drive of steam turbine extraction, effectively utilized the backwater in the heat heating heating network of exhaust steam, thereby reduced from the steam of steam turbine extraction, make the quantity of steam that continues in steam turbine, to do work increase, and then increased generated energy, improve unit efficiency.Under the situation of equal heat exhaustion,, make the gross coal consumption rate of unit obtain reduction because generated energy increases; Under the situation of same heating load, electric heating proportion is improved.
(3) UTILIZATION OF VESIDUAL HEAT IN hot-water heater of the present invention has effectively utilized the waste heat in the exhaust steam that part or all of steam turbine discharges, lowered the heat radiation load of air cooling tower, can effectively reduce air cooling tower cooling fan group's load, reduced blower fan group's power consumption, reduce station service, the power supplying efficiency of unit is provided.
(4) the present invention has increased temperature controller and flow controller, if the return water temperature of UTILIZATION OF VESIDUAL HEAT IN hot-water heater outlet is less than design temperature, then at first increase the amount of drawing gas of steam inlet place steam turbine of absorption heat pump and the exhaust steam inlet flow rate of condenser, next increases the amount of drawing gas of the steam inlet place steam turbine of heat exchanger; If the return water temperature of UTILIZATION OF VESIDUAL HEAT IN hot-water heater outlet then at first reduces the amount of drawing gas of the steam inlet place steam turbine of heat exchanger greater than design temperature, next reduces the amount of drawing gas of steam inlet place steam turbine of absorption heat pump and the exhaust steam inlet flow rate of condenser.Make that the automatization level of cogeneration of heat and power industry is higher.
(5) the present invention is by watch-dog, can displays temperature value and flow value, and make device more convenient to operate.
(6) the present invention makes that UTILIZATION OF VESIDUAL HEAT IN hot-water heater leaving water temperature adjustable range is wideer owing to be provided with heat exchanger, can adapt to the requirement of different occasions to leaving water temperature.
Description of drawings
Fig. 1 is the cogeneration of heat and power schematic diagram of prior art.
Fig. 2 is the cogeneration of heat and power energy saver schematic diagram that utilizes the heat supply of Direct Air-cooled Unit waste heat according to of the present invention.
Among the figure, 1-UTILIZATION OF VESIDUAL HEAT IN hot-water heater, 2-absorption heat pump, 3-heat exchanger, 4-steam turbine, the 5-condenser, 6-oxygen-eliminating device, 7-air cooling tower, 8-water storage tank, heat supply network of 9-, 10-secondary heat supply network, 11-secondary heat exchangers for district heating, 12-surface-type heat exchangers for district heating, 13-heat regenerative system.
The specific embodiment
Below with reference to accompanying drawing the specific embodiment of the present invention is described.
As shown in Figure 1, the typical feature of prior art is: No. one time heat exchangers for district heating is the surface-type heat exchangers for district heating, the backwater heating that the steam that utilizes steam turbine to extract out is sent here heating network (also being hot water pipe net).
Heating network has two-stage: heat supply network and secondary heat supply network.What be connected by pipeline with the surface-type heat exchangers for district heating is a heat supply network, and the secondary heat supply network is used for outside heat supply.
As shown in Figure 2, according to the cogeneration of heat and power energy saver that utilizes the heat supply of Direct Air-cooled Unit waste heat of the present invention, comprise steam turbine 4, oxygen-eliminating device 6 and air cooling tower 7, the exhaust steam outlet of described steam turbine 4 is connected with described air cooling tower 7 by exhaust casing, this device also comprises UTILIZATION OF VESIDUAL HEAT IN hot-water heater 1, described UTILIZATION OF VESIDUAL HEAT IN hot-water heater 1 comprises absorption heat pump 2, heat exchanger 3 and condenser 5, the exhaust steam outlet of described steam turbine 4 also is connected with the exhaust steam import of described condenser 5 by described exhaust casing, and the condensate water outlet of described condenser 5 is connected by the water storage tank of pipeline with described air cooling tower 7; The steam inlet of described absorption heat pump 2 is connected by the extraction opening of pipeline with described steam turbine 4, (heating network has two-stage to the backwater end of the water inlet end of described absorption heat pump 2 by pipeline and hot water pipe net: heat supply network and secondary heat supply network, what be connected by pipeline with described absorption heat pump is a heat supply network, the secondary heat supply network is used for outside heat supply) connect, described absorption heat pump 2 and described condenser 5 are by the closed circuit circulation that is connected to form of pipeline; The steam inlet of described heat exchanger 3 is connected by the extraction opening of pipeline with described steam turbine 4, the water inlet end of described heat exchanger 3 is connected by the water side of pipeline with described absorption heat pump 2, (heating network has two-stage to the water inlet end of the water side of described heat exchanger 3 by pipeline and hot water pipe net: heat supply network and secondary heat supply network, what be connected by pipeline with described heat exchanger is a heat supply network, and the secondary heat supply network is used for outside heat supply) connect; The hydrophobic back of converging of the hydrophobic and described absorption heat pump 2 of described heat exchanger 3 is connected with described oxygen-eliminating device 6.
On the exhaust steam inlet connecting branch road of described condenser 5, be provided with flow control valve, on the circulation pipeline between described absorption heat pump 2 and the described condenser 5, be provided with the flow booster, on the connecting line of the extraction opening of the steam inlet of described absorption heat pump 2 and described steam turbine 4, be provided with extraction control valve, on the connecting line of the extraction opening of the steam inlet of described heat exchanger 3 and described steam turbine 4, be provided with extraction control valve.
(corresponding water inlet, delivery port, air intake, venthole) establishes by-pass valve control on the above-mentioned connecting line, and the present invention adopts automatic regulating valve door (also can adopt manually-operated gate).
Automatics in this device comprises:
First temperature controller is installed on the water side pipeline of described absorption heat pump;
Second temperature controller is installed on the water side pipeline of described heat exchanger hot water;
The first flow controller is installed on described absorption heat pump and the bleed steam pipework that described turbine bleed point is connected;
Second flow controller is installed on described heat exchanger and the bleed steam pipework that described turbine bleed point is connected;
The 3rd flow controller is installed on the exhaust steam inlet connecting branch road of described condenser.
Watch-dog is connected with described first temperature controller, described second temperature controller, described first flow controller, described second flow controller and described the 3rd flow controller, is used for displays temperature value and flow value.
The cogeneration of heat and power power-economizing method that utilizes the heat supply of Direct Air-cooled Unit waste heat provided by the invention may further comprise the steps:
A, steam turbine enter air cooling tower by exhaust casing with part or all of exhaust steam, and exhaust steam by the lower atmosphere cooling of temperature, forms the water storage tank that condensate water is sent into air cooling tower after the condensation in air cooling tower;
B, steam turbine enter condenser by exhaust casing with part or all of exhaust steam, absorption heat pump and condenser are by the closed circuit circulation that is connected to form of pipeline, exhaust steam is cooled off by the recirculated water between absorption heat pump and the condenser in condenser, form the water storage tank that condensate water is sent into described air cooling tower after the condensation, exhaust steam simultaneously is with the recirculated water heat temperature raising;
C, be transported in the described absorption heat pump by the backwater of pipeline with hot water pipe net, water inlet as absorption heat pump, described absorption heat pump is by the driving of drawing gas of described steam turbine, and utilize heat in the recirculated water that described condenser sends here jointly to the water inlet heating, described absorption heat pump will lose the recirculated water of heat and deliver to described condenser, and heated hot water sent into by pipeline further be heated to the temperature that needs in the heat exchanger, the high-temperature-hot-water after described heat exchanger will heat up is delivered to the water inlet end of hot water pipe net;
The steam that D, described steam turbine are extracted out is divided into two strands, one enters described absorption heat pump, as driving steam, another thigh enters described heat exchanger, as the further thermal source that heats up of hot water, it is hydrophobic that two strands of steam condenses into after described absorption heat pump and described heat exchanger heat exchange, and two-way is hydrophobic sends into oxygen-eliminating device after converging.
The heat that water inlet absorbs in the UTILIZATION OF VESIDUAL HEAT IN hot-water heater is equivalent to the summation of two bursts of steam condensate heat releases and exhaust steam heat release.
Because the heat heating that has effectively utilized steam turbine to discharge in the exhaust steam is intake, reduced from the steam of steam turbine extraction, the quantity of steam that the invention enables continuation to do work in steam turbine increases, increased generated energy, improved unit efficiency, under the situation of same heating load, electric heating proportion is improved, and the gross coal consumption rate of unit obtains descending; In addition, owing to regained the heat in the steam turbine discharge exhaust steam, the actual heat radiation load of air cooling tower reduces, the corresponding minimizing of required cooling air volume, the present invention has reduced the operation platform number of a cooling air group of planes, or change cooling blower into power consumption that buncher (frequency conversion) reduces blower fan, and reduced station service, improved the power supplying efficiency of unit.
In the course of work,
(1) if the water temperature of heat exchanger water side is less than design temperature in the UTILIZATION OF VESIDUAL HEAT IN hot-water heater, as a certain numerical value in 90-130 ℃ (setting) with the climate temperature Automatic Optimal, two kinds of situations are then arranged, may be the steam inlet place amount of drawing gas of absorption heat pump few (bring may be enter the exhaust steam of condenser few) thereupon, also may be that the steam inlet place amount of drawing gas of heat exchanger is few; At this moment at first increase the amount of drawing gas of the steam inlet place steam turbine of absorption heat pump, increase the exhaust steam inlet flow rate of condenser simultaneously, next increases the amount of drawing gas of the steam inlet place steam turbine of heat exchanger;
(2) if the water temperature of heat exchanger water side is greater than setting value in the UTILIZATION OF VESIDUAL HEAT IN hot-water heater, as a certain numerical value in 90-130 ℃ (setting) with the climate temperature Automatic Optimal, two kinds of situations are then arranged, may be the steam inlet place amount of drawing gas of absorption heat pump many (bring may be enter the exhaust steam of condenser many) thereupon, also may be that the steam inlet place amount of drawing gas of heat exchanger is many; At this moment at first reduce the amount of drawing gas of the steam inlet place steam turbine of heat exchanger, the amount of drawing gas that next reduces the steam inlet place steam turbine of absorption heat pump reduces the exhaust steam inlet flow rate of condenser simultaneously.
The present invention adopts extracted steam from turbine to drive absorption heat pump to reclaim the waste heat that each system of Direct Air-Cooled Turbo-generator Set is discharged in the hot merit transfer process, heating heat supply network backwater, change continue to use always with the heat exchange pattern of extracted steam from turbine as single source, reduced the unit hear rate, reduced air cooling tower heat radiation load, reduce cooling air volume, and then reduce air cooling tower cooling air group of planes power, reduce station service.When equal steam turbine inlet steam amount, increase generated energy or under steam turbine generator rated power, reduce the saving of boiler evaporation capacity for engine and burn the coal amount, improve full factory integrated heat efficiency, reduce the unit net coal consumption rate, the purpose that reaches energy-saving and emission-reduction and increase economic efficiency.
Subcritical air-cooled steam turbine generator group with 300MWe design heat supply 550t/h is an example, and year heat supply season hour is pressed calculating in 2880-4320 hour according to utilizing.
(1) saves the about 6000-20000 ton of mark coal year of the present invention, reduce many tons of CO2 emission 15000-40000, reduce sulfur dioxide (SO2) emissions 50-200 ton, reduce discharged nitrous oxides 50-200 ton.
(2) the present invention utilizes the waste heat heat supply, has reduced the gross coal consumption rate of unit, has increased the generating capacity of unit, and a heat supply season can multiple electric 3000-8000 ten thousand KWh.
(3) cooling load of air cooling tubes condenser of the present invention will reduce 8-40%, down will load owing to dispelling the heat, and the blower fan power consumption that city office moves will reduce 8-40%.Press blower fan group power 3MW and calculate, each heating season will reduce blower fan power consumption 100-500 ten thousand kWh.
(4) the present invention will reduce unit generation coal consumption 5-20g/kWh after the waste heat heat supply under design conditions.
The present invention is not limited to the content that claim and the foregoing description are addressed, so long as any invention of creating out according to design of the present invention all should belong within protection scope of the present invention.

Claims (9)

1. utilize the cogeneration of heat and power energy saver of Direct Air-cooled Unit waste heat heat supply, comprise steam turbine, oxygen-eliminating device and air cooling tower, the exhaust steam outlet of described steam turbine is connected with described air cooling tower by exhaust casing, it is characterized in that, this device also comprises the UTILIZATION OF VESIDUAL HEAT IN hot-water heater, described UTILIZATION OF VESIDUAL HEAT IN hot-water heater comprises absorption heat pump, heat exchanger and condenser, the exhaust steam outlet of described steam turbine also is connected with the exhaust steam import of described condenser by described exhaust casing, and the condensate water outlet of described condenser is connected with the water storage tank of described air cooling tower by pipeline; The steam inlet of described absorption heat pump is connected with the extraction opening of described steam turbine by pipeline, the water inlet end of described absorption heat pump is connected with the backwater end of hot water pipe net by pipeline, and described absorption heat pump and described condenser are by the closed circuit circulation that is connected to form of pipeline; The steam inlet of described heat exchanger is connected with the extraction opening of described steam turbine by pipeline, and the water inlet end of described heat exchanger is connected with the water side of described absorption heat pump by pipeline, and the water side of described heat exchanger is connected with the water inlet end of hot water pipe net by pipeline; The hydrophobic back of converging of the hydrophobic and described absorption heat pump of described heat exchanger is connected with described oxygen-eliminating device.
2. the cogeneration of heat and power energy saver that utilizes the heat supply of Direct Air-cooled Unit waste heat according to claim 1 is characterized in that, is provided with flow control valve on the exhaust steam inlet connecting branch road of described condenser.
3. the cogeneration of heat and power energy saver that utilizes the heat supply of Direct Air-cooled Unit waste heat according to claim 1 is characterized in that, is provided with the flow booster on the circulation pipeline between described absorption heat pump and the described condenser.
4. the cogeneration of heat and power energy saver that utilizes the heat supply of Direct Air-cooled Unit waste heat according to claim 1 is characterized in that, is provided with extraction control valve on the connecting line of the extraction opening of the steam inlet of described absorption heat pump and described steam turbine.
5. the cogeneration of heat and power energy saver that utilizes the heat supply of Direct Air-cooled Unit waste heat according to claim 1 is characterized in that, is provided with extraction control valve on the connecting line of the extraction opening of the steam inlet of described heat exchanger and described steam turbine.
6. the cogeneration of heat and power energy saver that utilizes the heat supply of Direct Air-cooled Unit waste heat according to claim 1 is characterized in that this device also comprises
First temperature controller is installed on the water side pipeline of described absorption heat pump;
Second temperature controller is installed on the water side pipeline of described heat exchanger hot water;
The first flow controller is installed on described absorption heat pump and the bleed steam pipework that described turbine bleed point is connected;
Second flow controller is installed on described heat exchanger and the bleed steam pipework that described turbine bleed point is connected;
The 3rd flow controller is installed on the exhaust steam inlet connecting branch road of described condenser.
7. the cogeneration of heat and power energy saver that utilizes the heat supply of Direct Air-cooled Unit waste heat according to claim 6, it is characterized in that, this device also comprises the watch-dog that is used for displays temperature value and flow value, and described watch-dog is connected with described first temperature controller, described second temperature controller, described first flow controller, described second flow controller and described the 3rd flow controller.
8. utilize the cogeneration of heat and power power-economizing method of Direct Air-cooled Unit waste heat heat supply, it is characterized in that, may further comprise the steps:
A, steam turbine enter air cooling tower by exhaust casing with part or all of exhaust steam, and exhaust steam by the lower atmosphere cooling of temperature, forms the water storage tank that condensate water is sent into air cooling tower after the condensation in air cooling tower;
B, steam turbine enter condenser by exhaust casing with part or all of exhaust steam, absorption heat pump and condenser are by the closed circuit circulation that is connected to form of pipeline, exhaust steam is cooled off by the recirculated water between absorption heat pump and the condenser in condenser, form the water storage tank that condensate water is sent into described air cooling tower after the condensation, exhaust steam simultaneously is with the recirculated water heat temperature raising;
C, be transported in the described absorption heat pump by the backwater of pipeline with hot water pipe net, water inlet as absorption heat pump, described absorption heat pump is by the driving of drawing gas of described steam turbine, and utilize heat in the recirculated water that described condenser sends here jointly to the water inlet heating, described absorption heat pump will lose the recirculated water of heat and deliver to described condenser, and heated hot water sent into by pipeline further be heated to the temperature that needs in the heat exchanger, the high-temperature-hot-water after described heat exchanger will heat up is delivered to the water inlet end of hot water pipe net;
The steam that D, described steam turbine are extracted out is divided into two strands, one enters described absorption heat pump, as driving steam, another thigh enters described heat exchanger, as the further thermal source that heats up of hot water, it is hydrophobic that two strands of steam condenses into after described absorption heat pump and described heat exchanger heat exchange, and two-way is hydrophobic sends into oxygen-eliminating device after converging.
9. the cogeneration of heat and power power-economizing method that utilizes the heat supply of Direct Air-cooled Unit waste heat according to claim 8 is characterized in that,
(1) if the water temperature of described heat exchanger water side less than design temperature, the amount of drawing gas of steam turbine and the exhaust steam inlet flow rate of described condenser are stated in the steam inlet place that then at first increases described absorption heat pump, and the amount of drawing gas of steam turbine is stated in next steam inlet place that increases described heat exchanger;
(2) if the water temperature of described heat exchanger water side greater than design temperature, the amount of drawing gas of steam turbine is stated in the steam inlet place of then at first reducing described heat exchanger, and next reduces the steam inlet place of described absorption heat pump and states the amount of drawing gas of steam turbine and the exhaust steam inlet flow rate of described condenser.
CN2010105273562A 2010-10-26 2010-10-26 Cogeneration energy-saving device and method using residual heat of direct air-cooling unit to supply heat Pending CN102032612A (en)

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CN107062354A (en) * 2017-06-08 2017-08-18 东北大学 A kind of absorption heat pump heating system
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CN108870503B (en) * 2018-07-16 2023-12-22 中国能源建设集团山西省电力勘测设计院有限公司 Waste heat comprehensive utilization system for long-distance industrial steam supply of intermittent steam utilization users
CN109579112A (en) * 2019-01-07 2019-04-05 清华大学 A kind of thermal power plant unit thermoelectricity decoupled system and its operation method
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Application publication date: 20110427