CN103968444A - Energy saving device for directly recycling waste heat from condenser of power plant to supply heat and energy saving method - Google Patents

Energy saving device for directly recycling waste heat from condenser of power plant to supply heat and energy saving method Download PDF

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Publication number
CN103968444A
CN103968444A CN201410204665.4A CN201410204665A CN103968444A CN 103968444 A CN103968444 A CN 103968444A CN 201410204665 A CN201410204665 A CN 201410204665A CN 103968444 A CN103968444 A CN 103968444A
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China
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heat
power plant
condenser
cooling
heat supply
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CN201410204665.4A
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Chinese (zh)
Inventor
刘枫
黄寿山
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Shenyang Maple Leaf Energy Science Co Ltd
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Shenyang Maple Leaf Energy Science Co Ltd
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Priority to CN201410204665.4A priority Critical patent/CN103968444A/en
Publication of CN103968444A publication Critical patent/CN103968444A/en
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Abstract

The invention relates to an energy saving device for using waste heat of a power plant for urban centralized heat supply and an energy saving method of the energy saving device. According to the structure of the energy saving device, a steam exhaust opening of a power plant turbine is cooled through a power plant cooling system, a heat supply main heat exchanger is arranged on a heat supply primary network, and a heat source inlet of the heat supply main heat exchanger is connected with a steam extraction opening of the power plant turbine; the steam exhaust opening of the power plant turbine is connected with an inlet of a condenser; a hot water heat exchange channel is formed in the condenser, a primary network water return pipeline is connected with an inlet of the hot water heat exchange channel, and an outlet of the hot water heat exchange channel is connected with an inlet of the heat supply main heat exchanger through a heat supply main circulating pump; uncondensed waste steam of the condenser is cooled through the power plant cooling system. The energy saving device enables a steam condensing system of the power plant and an urban concentrated heat supply system to be combined in a high degree, a steam condensing device of the power plant is transformed, system waste heat which is originally exhausted to the atmosphere is recycled as much as possible, in this way, the comprehensive heat efficiency of the power plant is improved, power generation energy consumption is lowered, and part of the heat source problem of urban heat supply is solved.

Description

From energy saver and the power-economizing method of the direct recovery waste heat heat supply of plant condenser
Technical field
The present invention relates to a kind of energy saver and power-economizing method from the direct recovery waste heat heat supply of plant condenser, relate to cogeneration of heat and power and concentrated supply of heating in the city both direction.
Background technology
China adopts cogeneration of heat and power central heating pattern to City Building heating since the sixties in last century.Adopt cogeneration of heat and power technology to improving energy utilization rate, to improving city environmental quality, providing amenities for the people plays an important role.
Cogeneration of heat and power is thermal energy step utilization success model, and it is to utilize high level heat generating to utilize relative Lowlevel thermal energy heat supply, and the energy utilization rate in pure condensate formula power plant is below 40%.The capacity usage ratio of cogeneration of heat and power can reach 60%.But still have the low grade heat energy more than 30% to be lost to atmosphere from cooling tower.The low grade heat energy distributing in order to reclaim this 30% multidirectional atmosphere as far as possible, people's initial stage adopts the cooling water of condenser, does not go up cooling tower and is directly used for resident's heating.Because cooling water inflow is too large, water temperature is too low, and heating effect is influenced, and the large flow operation of low temperature, and power consumption is large, water consumption is many, the large heat supply of heat supply caliber is once invested larger.It has reached low-level resident's heating object, but comfortableness and overall economic efficiency are not good.
Along with the continuous expansion in city, clean energy resource is shortage relatively all the more, has occurred in recent years utilizing heat pump techniques that the low grade heat energy of the cooling water of power plant is risen to the higher heat energy of relative temperature and has realized heat supply, reaches the object that part of waste heat is utilized.In this technical know-how, be correct, in fact also have a Multi-instance.Only not enough is that its investment is large, sees that its cost performance is unsuitable from economic angle.Paying more than its income of enterprise is large, and in enormous quantities popularization is for a long time unpractical.Have the existence of coal-burning power plant just have distributing of exhaust steam residual heat also just have surplus heat recycling new method appearance may, up to the present the method for above-mentioned two kinds of UTILIZATION OF VESIDUAL HEAT IN all belongs to indirect utilization mode.Known by scientific and technological convention: the benefit that the benefit that any employing indirect mode obtains always obtains than direct mode is low.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of energy saver and power-economizing method from the direct recovery waste heat heat supply of plant condenser, this energy saver and power-economizing method are that the exhaust steam condenser system behind power plant is combined with the height of central heating water system, and plant condenser device is transformed.Heating system parameter is unified to adjust, the exhaust steam residual heat script discharged to atmosphere, partially recycled, thus improve the integrated heat efficiency of power plant, reduce generating energy consumption.
For overcoming the above problems, concrete scheme of the present invention is as follows: a kind of energy saver from the direct recovery waste heat heat supply of plant condenser, the steam drain that comprises power plant steam turbine is undertaken cooling by electric power plant cooling system, be provided with heat supply main heat exchanger on the net in heat supply one-level, the thermal source entrance of heat supply main heat exchanger is connected with the extraction opening of power plant steam turbine; Be connected at the steam drain of power plant steam turbine and the entrance of condenser; Hot water heat exchanger channels is set in condenser, and one-level net water return pipeline is connected with the entrance of hot water heat exchanger channels, and the outlet of hot water heat exchanger channels is connected with heat supply main heat exchanger entrance by heat supply main circulation pump; Wherein the uncooled exhaust steam of condenser is cooling by electric power plant cooling system.
Described condenser is provided with cooling-water duct, and cooling-water duct is positioned at hot water heat exchanger channels below, and the water of power plant cooling tower passes through the cooling circuit of the cooling-water duct formation electric power plant cooling system of condenser by cooling water circulating pump.
The Electric Factory Air-Cooling Island that the uncooled exhaust steam of described condenser connects by exhaust steam control valve is cooling.
Utilize above-mentioned energy saver to carry out the power-economizing method for concentrated supply of heating in the city by residual heat of electric power plant, comprise the following steps:
1) power plant steam turbine is being guaranteed under safe prerequisite, appropriateness improves the pressure of power plant steam turbine operation exhaust pressure, thus the adiabatic condensation temperature of the exhaust steam of raising power plant steam turbine in condenser;
2) exhaust steam in condenser has been carried out a Low Temperature Thermal exchange by hot water heat exchanger channels by the water in one-level net water return pipeline, improves the water temperature of one-level net water return pipeline;
3) water in one-level net water return pipeline is delivered to heat supply main switch through main circulation pump, by the secondary high-temperature heat exchange in heat supply main heat exchanger, thereby reaches heat supply standard, then delivers to the user of each heating housing estate by one-level net heat supply pipeline;
4) at the heat donor passage of condenser, cooling residue exhaust steam of condensing is fully cooling in electric power plant cooling system not yet completely in simultaneously exhaust steam, the completion system circulation of condensing.
Effectively recycle being discharged to the low taste heat that is difficult in atmosphere to utilize generating originally from the energy saver of the direct recovery waste heat heat supply of plant condenser; take full advantage of generating waste-heat heat supply; reduce unit generation energy consumption; increase the generating capacity of unit; taking the unit of transforming a 300MW as example, one can multiple 1-3 hundred million KWh for warm season; Because most of waste heat in condenser is utilized by heat supply, be equivalent to reclaim thermic load 209.3MW, and will reduce nearly 1,000,000 tons at the rate of water make-up of whole Heating Season cooling tower; The coal amount of saving, is equivalent to reduce generating set gross coal consumption rate 30-50g/kwh after UTILIZATION OF VESIDUAL HEAT IN transformation.
The exhaust steam that utilizes above-mentioned energy saver to carry out after the direct recovery waste heat of plant condenser generates electricity by power plant steam turbine for the power-economizing method of concentrated supply of heating in the city is input to condenser, and by the supplying hot water heat exchanger channels in condenser, heat is passed on the one hand to the water supply line of heat supply network, thereby reach the object of heat supply network recovery waste heat, this method has been omitted common heat pump processing procedure used simultaneously, not only reduce the cost of device entirety, but also greatly reduce overall operating cost.
Brief description of the drawings
Fig. 1 is the structural representation from the energy saver embodiment mono-of the direct recovery waste heat heat supply of plant condenser.
Fig. 2 is the structural representation from the energy saver embodiment bis-of the direct recovery waste heat heat supply of plant condenser.
Detailed description of the invention
Embodiment mono-(water-cooling system power plant)
As shown in Figure 1, a kind of energy saver from the direct recovery waste heat heat supply of plant condenser, is provided with heat supply main heat exchanger 3 on the net in heat supply one-level, and the thermal source entrance of heat supply main heat exchanger 3 is connected with the extraction opening of power plant steam turbine 1; Steam drain at power plant steam turbine 1 is connected with the entrance of condenser 2; Hot water heat exchanger channels is set in condenser 2, one-level net water return pipeline is connected with the entrance of hot water heat exchanger channels, the outlet of hot water heat exchanger channels is connected with heat supply main heat exchanger 3 entrances by heat supply main circulation pump 4, one-level net water return pipeline is connected with the hot water heat exchanger channels of condenser 2, make one-level net water return pipeline in hot water heat exchanger channels, carry out preliminary heat exchange, thereby saved the heat in the interior second heat exchange of heat supply main heat exchanger 3; Wherein condenser 2 is provided with cooling-water duct, and cooling-water duct is positioned at hot water heat exchanger channels below, and the water of power plant cooling tower 5 forms the cooling circuit of electric power plant cooling system through the cooling-water duct of condenser 2 by cooling water circulating pump 6.
This condenser 2 arranges hot water heat exchanger channels and cooling water passage structure, on the one hand one-level net water return pipeline in the hot water heat exchanger channels of condenser through once heating, obtain a large amount of exhaust steam residual heats waste heat that condenses, enter again heat supply main heat exchanger 3, be heated to heat supply temperature, send into city heat supply first-level pipeline network, complete for thermal cycle, it has saved the heat that heat supply main heat exchanger 3 is exported; In condenser, the once cooling of heat donor passage passed through in exhaust steam on the other hand, and remaining exhaust steam enters cooling duct again and undertaken coolingly for the second time by former electricity generation system cooling water, until exhaust steam total condensation, this process has been saved the cooling procedure of cooling water.
Utilize the energy saver of embodiment mono-to carry out the power-economizing method for concentrated supply of heating in the city by residual heat of electric power plant, comprise the following steps:
1) power plant steam turbine 1 is being guaranteed under safe prerequisite, appropriateness raising power plant steam turbine 1 moves the pressure of exhaust pressure, thus the adiabatic condensation temperature of the exhaust steam of raising power plant steam turbine in condenser 2;
2) exhaust steam in condenser 2 has been carried out a Low Temperature Thermal exchange by hot water heat exchanger channels by the water in one-level net water return pipeline, improves the water temperature of one-level net water return pipeline, has reduced the temperature of exhaust steam simultaneously;
3) water in one-level net water return pipeline is delivered to heat supply main switch 3 through main circulation pump 4, by the secondary high-temperature heat exchange in heat supply main heat exchanger 3, thereby reach heat supply standard, then deliver to the user of each heating housing estate by the water supply line in one-level net heating network;
4) the simultaneously not yet completely cooling residue exhaust steam of condensing of the heat donor passage of condenser 2 is through the cooling-water duct in condenser 2, fully cooling in condenser after, the completion system circulation of condensing.
Embodiment bis-(air cooling system power plant)
As shown in Figure 2, the Electric Factory Air-Cooling Island 7 that the uncooled exhaust steam of condenser 2 connects by exhaust steam control valve 9 is cooling.Being that the appropriate exhaust steam of power plant steam turbine 1 steam drain enters into condenser 2, is the preliminary heat exchange of one-level net water return pipeline by hot water heat exchanger channels, and the Electric Factory Air-Cooling Island 7 that residue exhaust steam connects by exhaust steam control valve 9 is cooling.All the other structures are identical with embodiment mono-.
This structure is applicable to the air cooling system power plant of water scarcity, and the exhaust steam that a part is not utilized by hot water heat exchanger channels, is undertaken cooling by Air-Cooling Island 7.
Utilize the energy saver of embodiment bis-to carry out the power-economizing method for concentrated supply of heating in the city by residual heat of electric power plant, comprise the following steps:
1) power plant steam turbine 1 is being guaranteed under safe prerequisite, appropriateness raising power plant steam turbine 1 moves the pressure of exhaust pressure, thus the adiabatic condensation temperature of the exhaust steam of raising power plant steam turbine in condenser 2;
2) exhaust steam in condenser 2 has been carried out a Low Temperature Thermal exchange by hot water heat exchanger channels by the water in one-level net water return pipeline, improves the water temperature of one-level net water return pipeline;
3) water in one-level net water return pipeline is delivered to heat supply main switch 3 through main circulation pump 4, by the secondary high-temperature heat exchange in heat supply main heat exchanger 3, thereby reaches heat supply standard, then delivers to the user of each heating housing estate by one-level net heat supply pipeline;
4) simultaneously exhaust steam carry out at the heat donor passage Electric Factory Air-Cooling Island 7 that cooling residue exhaust steam of condensing connects by exhaust steam control valve 9 not yet completely of condenser 2 cooling, the completion system circulation of condensing.
Should be from the energy-saving effect of the energy saver of the direct recovery waste heat heat supply of plant condenser: take out solidifying unit as example taking a 300MW, by utilizing hourage, 3624 hours (151 days) are calculated as follows in a year heat supply:
(1) adopt after the technology of the present invention transformation, can obtain UTILIZATION OF VESIDUAL HEAT IN thermic load 209.34MW(and be equivalent to 300t/h boiler load) year save 10.24 ten thousand tons of mark coal amounts;
(2) the present invention makes full use of waste heat for supplying, has reduced unit generation energy consumption, has increased the generating capacity of unit, and one can multiple electric 1-3 hundred million KWh for warm season;
(3), because most of waste heat in condenser is utilized by heat supply, so the water of power plant cooling tower reduces greatly, the rate of water make-up of whole Heating Season cooling tower reduces (power plant's water-saving amount) approximately nearly 1,000,000 tons;
(4) the present invention utilizes thermic load 209.34MW under design conditions, and whole Heating Season utilizes heat for 758648.16MWh, is equivalent to save 10.24 ten thousand tons of mark coal amounts, is equivalent to reduce unit generation power consumption 30-50g/kwh after UTILIZATION OF VESIDUAL HEAT IN transformation.
In sum, the present invention brings big business's economic benefit, environmental benefit and social benefit.

Claims (4)

1. the energy saver from the direct recovery waste heat heat supply of plant condenser, the steam drain that comprises power plant steam turbine (1) is undertaken cooling by electric power plant cooling system, it is characterized in that: be provided with heat supply main heat exchanger (3) on the net in heat supply one-level, the thermal source entrance of heat supply main heat exchanger (3) is connected with the extraction opening of power plant steam turbine (1); Steam drain at power plant steam turbine (1) is connected with the entrance of condenser (2); In condenser (2), hot water heat exchanger channels is set, one-level net water return pipeline is connected with the entrance of hot water heat exchanger channels, and the outlet of hot water heat exchanger channels is connected with heat supply main heat exchanger (3) entrance by heat supply main circulation pump (4); Wherein the uncooled exhaust steam of condenser (2) is cooling by electric power plant cooling system.
2. the energy saver from the direct recovery waste heat heat supply of plant condenser as claimed in claim 1, it is characterized in that: described condenser (2) is provided with cooling-water duct, cooling-water duct is positioned at hot water heat exchanger channels below, and the water of power plant cooling tower (5) forms the cooling circuit of electric power plant cooling system through the cooling-water duct of condenser (2) by cooling water circulating pump (6).
3. the energy saver from the direct recovery waste heat heat supply of plant condenser as claimed in claim 1, is characterized in that: the Electric Factory Air-Cooling Island (7) that the described uncooled exhaust steam of condenser (2) connects by exhaust steam control valve (9) is cooling.
4. utilize energy saver as claimed in claim 2 or claim 3 to carry out the power-economizing method for concentrated supply of heating in the city by residual heat of electric power plant, it is characterized in that comprising the following steps:
1) power plant steam turbine (1) is being guaranteed under safe prerequisite, appropriateness improves the pressure of power plant steam turbine (1) operation exhaust pressure, thus the adiabatic condensation temperature of the exhaust steam of raising power plant steam turbine in condenser (2);
2) exhaust steam in condenser (2) has been carried out a Low Temperature Thermal exchange by hot water heat exchanger channels by the water in one-level net water return pipeline, improves the water temperature of one-level net water return pipeline;
3) water in one-level net water return pipeline is delivered to heat supply main switch (3) through main circulation pump (4), by the secondary high-temperature heat exchange in heat supply main heat exchanger (3), thereby reach heat supply standard, then deliver to the user of each heating housing estate by one-level net heat supply pipeline;
4) at the heat donor passage of condenser (2), cooling residue exhaust steam of condensing is fully cooling in electric power plant cooling system not yet completely in simultaneously exhaust steam, the completion system circulation of condensing.
CN201410204665.4A 2014-05-15 2014-05-15 Energy saving device for directly recycling waste heat from condenser of power plant to supply heat and energy saving method Pending CN103968444A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105823110A (en) * 2015-01-04 2016-08-03 沈阳扬波科技能源工程有限公司 Thermal power plant cold source loss recovery heat supply system
CN107120713A (en) * 2017-06-16 2017-09-01 华电郑州机械设计研究院有限公司 A kind of anti-overtemperature cooling system of high back pressure thermal power plant unit condensate

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101025343A (en) * 2006-02-21 2007-08-29 许建壮 Generating plant circulation-water electrothermal combined production and air-cooling spraying combined cooling system
CN101943435A (en) * 2010-09-25 2011-01-12 北京联合优发能源技术有限公司 Thermoelectricity co-generation energy-saving device for supplying heat by using waste heat and energy-saving method thereof
CN102278786A (en) * 2011-08-13 2011-12-14 双良节能系统股份有限公司 Central heating system using waste heat of direct air cooling power plant
CN102840573A (en) * 2011-06-24 2012-12-26 同方节能工程技术有限公司 Water replenishing preheating system of thermal power plant

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101025343A (en) * 2006-02-21 2007-08-29 许建壮 Generating plant circulation-water electrothermal combined production and air-cooling spraying combined cooling system
CN101943435A (en) * 2010-09-25 2011-01-12 北京联合优发能源技术有限公司 Thermoelectricity co-generation energy-saving device for supplying heat by using waste heat and energy-saving method thereof
CN102840573A (en) * 2011-06-24 2012-12-26 同方节能工程技术有限公司 Water replenishing preheating system of thermal power plant
CN102278786A (en) * 2011-08-13 2011-12-14 双良节能系统股份有限公司 Central heating system using waste heat of direct air cooling power plant

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105823110A (en) * 2015-01-04 2016-08-03 沈阳扬波科技能源工程有限公司 Thermal power plant cold source loss recovery heat supply system
CN107120713A (en) * 2017-06-16 2017-09-01 华电郑州机械设计研究院有限公司 A kind of anti-overtemperature cooling system of high back pressure thermal power plant unit condensate

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Application publication date: 20140806