CN106016241A - Cold-end waste heat gradient-utilization energy-saving system and method - Google Patents

Cold-end waste heat gradient-utilization energy-saving system and method Download PDF

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Publication number
CN106016241A
CN106016241A CN201610583449.4A CN201610583449A CN106016241A CN 106016241 A CN106016241 A CN 106016241A CN 201610583449 A CN201610583449 A CN 201610583449A CN 106016241 A CN106016241 A CN 106016241A
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China
Prior art keywords
heat
water
intermediary
air
heating
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CN201610583449.4A
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Chinese (zh)
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CN106016241B (en
Inventor
杨磊磊
李本锋
卢海申
马建忠
郭清温
王岩
郭永红
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Datang Environment Industry Group Co Ltd
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Datang Beijing Energy Management Co Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22DPREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D1/00Feed-water heaters, i.e. economisers or like preheaters
    • F22D1/32Feed-water heaters, i.e. economisers or like preheaters arranged to be heated by steam, e.g. bled from turbines
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22DPREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D1/00Feed-water heaters, i.e. economisers or like preheaters
    • F22D1/36Water and air preheating systems
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23LSUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L15/00Heating of air supplied for combustion
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B30/00Heat pumps
    • F25B30/06Heat pumps characterised by the source of low potential heat
    • 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
    • Y02E20/34Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)

Abstract

The invention discloses a cold-end waste heat gradient-utilization energy-saving system which comprises a heat removal system, a heat medium control system and a heating system, wherein the heat removal system is accessed to a circulating cooling water pipeline; the heat medium control system is connected to the heat removal system and the heating system; a heat pump unit in the heat removal system is connected to the circulating cooling water pipeline and an intermediate water pipeline in the heat medium control system; the intermediate water pipeline in the heat medium control system is connected to the heating system; and the heating system is accessed to a boiler primary air or secondary air system. The waste heat is recycled and utilized in a gradient manner, so that cold-end loss of a power device is reduced, efficiency of the power device is improved, operation hours per year of the device are greatly increased, and economical efficiency is greatly improved.

Description

It is a kind of that cold end is exhaust heat stepped utilizes energy conserving system and method
Technical field
The invention belongs to power plant for energy conservation field, be specifically related to a kind of cold end UTILIZATION OF VESIDUAL HEAT IN energy conserving system
Background technology
Coal is that (proportion accounting for primary energy consumption 2014 is 64.2% to the main primary energy of China, 2015 It is expected to be 63.3%), it is concentrated mainly on thermoelectricity, metallurgy and building material industry.Fired power generating unit is main force's electromotor of China Group, its installed capacity accounts for about the 73% of total installed capacity of electricity capacity, and generated energy accounts for the ratio of gross generation more than 80%. Thus reduce the coal consumption of fired power generating unit, and improving power plant efficiency, the energy-saving and emission-reduction to China are significant.
Heat pump is that one utilizes high-grade heat energy as drive energy, reclaims low grade heat energy setting for heat supply or intensification Standby, it is widely used in the fields such as power plant, oil, chemical industry and metallurgy.Can not keep away during the heat to power output of power plant There is intrinsic cold source energy with exempting from, modern power plants thermal efficiency of cycle is 40%~57%.Heat pump is used to reclaim thermoelectricity Recirculated water/exhaust steam cold end low temperature exhaust heat of factory, can improve the heat-economy of power plant, have significant energy-saving effect.
Existing cold end residual-heat utilization technology, utilizes the heat user of reclaimed heat to there is load variations problem.Winter has A large amount of heat user, spring and summer does not has heat user autumn substantially.Reclaim heat and be mainly used in the front-mounted heating of Winter heat supply (in advance Heat).This just has the biggest application limitation.And in non-confession thermal region (such as province, south) and non-confession (spring in hot season Summer and autumn), waste-heat recovery device cannot put into operation, and annual hours of operation is the most effective.Largely reduce remaining The economy of heat utilization device.
Summary of the invention
It is an object of the invention to provide a kind of Appropriate application power plant cold end (recirculated water/exhaust steam) waste heat, improve energy profit By efficiency, it is achieved the cold end bootstrap system of power plant for energy conservation consumption reduction.
To achieve these goals, the technical scheme is that the exhaust heat stepped energy conserving system that utilizes of a kind of cold end, bag Include and take hot systems, heating agent control system, heating system;Taking hot systems and access recirculated cooling water pipeline, heating agent controls system System connection takes hot systems and heating system;It is characterized in that: the heat pump unit taking in hot systems connects circulating cooling water pipe Intermediary's water lines in road and heating agent control system, in heating agent control system, intermediary's water lines connects heating system, heating System access boiler First air or secondary air system.
Also provide for that a kind of cold end is exhaust heat stepped utilizes power-economizing method, when system is run, utilize and take hot systems from steam turbine The driving steam of extraction certain pressure enters heat pump;Heat pump work absorbs the cooling-tower circulating water waste heat accessed, and heating comes Intermediary's water in heating agent control system;It is characterized in that: the intermediary's water after heating accesses boiler First air or secondary wind Heating system, is heated boiler First air or secondary wind by intermediary's water heat release;
When normal operation mode, heat pump unit takes between institute's calorific requirement of heat and heat boiler First air or secondary wind Keeping balance, intermediary's water of heating agent control system all carries out heat exchange transmission;
When compensating working method, heat pump unit takes shortage of heat, is added hot mediation water further by supplementary heat exchanger;
When bypass mode, it is too much that heat pump unit takes heat, and heat pump unit intermediary discharge is flow through in regulation, reduces Actual heat exchange amount.
The present invention, according to the principle of energy cascade utilization, utilizes heat pump to take heat from condenser recirculated water, adds heat primary air Or secondary wind so that First air or secondary wind suitably heat up, thus improve boiler efficiency, reach energy-conservation effect.This Kind cold end is exhaust heat stepped utilizes energy conserving system, has a following features:
From condenser recirculated water, take heat, for heating boiler First air or secondary wind, properly increase pathogenic wind-warm.Waste heat returns Receive and ladder utilizes, decrease power set cold end loss, improve power plant effiiency.
Overcome the limitation of other cold end residual-heat utilization technology.Heat user is boiler First air or secondary wind.Device one The four seasons in year can put into operation, and can apply for thermal region and non-confession thermal region.The annual hours of operation of device is significantly Improving, the economy of residual heat using device is greatly improved.
Accompanying drawing explanation
Fig. 1 is residual neat recovering system structural representation;
Detailed description of the invention
1 the invention will be further described below in conjunction with the accompanying drawings, it will be appreciated that content described herein is only used for Bright and explain the present invention, be not intended to limit the present invention.
The cold end of the present invention is exhaust heat stepped utilizes energy conserving system, takes hot systems, the control of B heating agent including three system: A System, C heating system;
Take hot systems and include steam turbine 1, condenser 2, heat pump unit 3;Heating system includes boiler First air or secondary Wind system, boiler First air or secondary wind heating system;Heating agent controls (hydrophily) system and includes closed cycle intermediary water (hydrophily), pipeline, valve, heating vapour system, water charging system, pressure fixing system, drainage etc..
1, hot systems is taken
Take hot systems and include steam turbine 1, condenser 2, heat pump unit 3.
The soda pop fluid entering heat pump unit has: the driving steam drawn from steam turbine by steam pipework 11;Condensing Device recirculated water;Closed cycle intermediary water (hydrophily).
Drawing from steam turbine drives steam pipework 11 to be connected to heat pump unit, condenses into water after heat pump unit heat exchange. Discharge from heat pump unit and condense water by the solidifying water heat regenerative system of pipeline 12 access.
Condenser recirculated water accesses heat pump unit from water pipe 8 through water pump 17 and recirculated water oral siphon 10, through following after cooling Ring water return pipe 9 accesses and flows back to water pipe 7 from cooling tower 4, accesses condenser circulation.
Closed cycle intermediary water (hydrophily) accesses heat pump unit, after intensification with uniform temperature through intermediary's water oral siphon 14 Access heating system through intermediary's water return pipe 13, in order to heating boiler First air or secondary wind, improve pathogenic wind-warm.With one Closed cycle intermediary water after secondary wind or secondary wind carry out heat exchange cooling turns again to heat pump unit, constitutes a circulation. Closed cycle intermediary water moves in circles operation, utilizes heat pump to take heat from condenser recirculated water, then transfers heat to pot Stove First air or secondary wind.
2, heating system
Heating system includes boiler First air or secondary air system, boiler First air or secondary wind heating system.
Boiler First air or secondary wind heating system be a group be arranged in after First air or overfire air fan in air channel 6 or Several groups of heating surfaces.It is similar to that boiler economizer, is made up of finned tube and header.Including for accessing boiler one The inlet portion 15 of secondary wind or secondary air system and export department 16.
Closed cycle intermediary water (hydrophily) after heating up in heat pump unit, accesses heating system, and intermediary's water walks flue In finned tube heating surface tube, with the boiler First air flowed into by inlet portion 15 and flow outside finned tube or secondary wind Heat exchange, the heat in closed cycle intermediary water (hydrophily) passes to boiler First air or secondary wind so that it is heat up, so Flowed out by export department 16 afterwards and enter air preheater again.Closed cycle intermediary water after cooling turns again to heat pump unit, Boiler First air or secondary wind after intensification enter air preheater and continue to heat up.
3, heating agent controls (hydrophily) system
Heating agent controls (hydrophily) system and includes closed cycle intermediary water (hydrophily), pipeline, valve, adds vapours system System, water charging system, pressure fixing system, drainage etc..
It is an intermediary system that heating agent controls (hydrophily) system, ins succession and take hot systems in one end, and the other end is ined succession and heated system System.Closed cycle intermediary water moves in circles operation.By taking hot systems, by the heat in condenser recirculated water, transmission To hydrophily;By heating system, the heat in hydrophily is passed to boiler First air or secondary wind.
Intermediary's water (hydrophily) that heating agent controls in (hydrophily) system is desalted water.The purpose of heating agent control system is control The temperature of intermediary processed water;Water charging system, pressure fixing system, drainage etc. belong to system and run the regulating measure of needs.
Intermediary's water return pipe 13 of heat pump unit is connected to heat exchanger 19, by accessing boiler First air after heat exchanger 19 Or the oral siphon of secondary wind heating system;The return pipe of boiler First air or secondary wind heating system is by after water pump 18 Take back intermediary's water oral siphon 14.Heat exchanger 19 introduces auxiliary heating working medium by pipeline 22 and regulation valve 20, can adopt Assist with steam or hot water and add hot mediation water, when heat pump unit takes shortage of heat, adjusted by regulation valve and auxiliary is provided Heating, it is ensured that boiler First air or the heating-up temperature of secondary wind;Intermediary's water return pipe 13 in heat pump unit side and in It is provided with bypass branch and regulation valve 21 between Jie's water oral siphon 14, is used for adjusting heat pump unit heat exchange amount, when taking heat Time too much, open and adjust valve, making a part of intermediary water not by heat pump unit, reduce actual heat exchange amount.
When whole energy conserving system runs,
Utilize and take the hot systems driving steam entrance heat pump from steam turbine extraction certain pressure, after heat release, be condensed into condensation Water;Heat pump work absorbs the circulating water afterheat accessed, and heating is from the intermediary's water in heating agent control system, after heating Intermediary water accesses boiler First air or secondary wind heating system, is heated boiler First air or secondary by intermediary's water heat release Wind.
Normal operation mode: protect between institute's calorific requirement of heat and heat boiler First air or secondary wind when heat pump unit takes During fair weighing apparatus, intermediary's water of heating agent control system all carries out heat exchange transmission.
Compensate working method: when heat pump unit takes shortage of heat, added hot mediation water further by supplementary heat exchanger, Utilize regulation valve to adjust and auxiliary heating is provided, it is ensured that boiler First air or the heating-up temperature of secondary wind;
Bypass mode: when heat pump unit take heat too much time, open the bypass in parallel of intermediary's water heat absorbing end, utilize Regulation valve adjusts and makes a part of intermediary water not by heat pump unit, reduces actual heat exchange amount.
In the actual application of heat pump, along with the decline of outdoor temperature, its performance is with under circulating cooling coolant-temperature gage Drop and reduce.The present invention is according to the principle of energy cascade utilization, it is possible to effectively regulates and avoids boiler First air or secondary The heating-up temperature of wind, the temperature fluctuation off-design value of recirculated cooling water, ensure the steady safe operation of heat pump, make heat pump Unit reclaims power plant's cold end waste heat maximized.Eliminate microthermal climate to a certain extent to heat pump application simultaneously Limit, expanded the heat pump application in north part cold district power plant.
This heating system is not limited to use the steam power plant of steam turbine it can also be used to the cold end of Combined cycle gas-steam turbine unit Bootstrap system;It is not limited to reclaim the heat pump of circulating cooling water afterheat it can also be used to the cold end Low Temperature Thermal such as exhaust steam The heat pump of source waste heat recovery.
Finally it is noted that the foregoing is only the explanation of the present invention, it is not limited to the present invention, although to this Invention has been described in detail, and for a person skilled in the art, it still can be to aforementioned described skill Art scheme is modified, or wherein portion of techniques feature is carried out equivalent.All in the spirit and principles in the present invention Within, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.

Claims (10)

1. cold end is exhaust heat stepped utilizes an energy conserving system, including taking hot systems, heating agent control system, heating system; Taking hot systems and access recirculated cooling water pipeline, the connection of heating agent control system takes hot systems and heating system;It is characterized in that: Take the heat pump unit in hot systems and connect the intermediary's water lines in recirculated cooling water pipeline and heating agent control system, heating agent control In system processed, intermediary's water lines connects heating system, and heating system accesses boiler First air or secondary air system.
Cold end the most according to claim 1 is exhaust heat stepped utilizes energy conserving system, it is characterised in that take hot systems Including steam turbine, condenser, heat pump unit;Drawing from steam turbine drives steam pipework to be connected to heat pump unit, in heat Water is condensed into after pump unit heat exchange;Condenser recirculated water accesses heat pump unit, after cooling through water pump and recirculated water oral siphon Cooling tower circulating water system is accessed through recirculated water return pipe;The intermediary's water carrying out closed cycle accesses through intermediary's water oral siphon Heat pump unit, accesses heating system through intermediary's water return pipe after intensification.
Cold end the most according to claim 1 is exhaust heat stepped utilizes energy conserving system, it is characterised in that heating system Including boiler First air or secondary air system, boiler First air or secondary wind heating system;After heat pump unit heats up Intermediary's water, access heating system, with flow into boiler First air or secondary wind heat exchange, in intermediary's water heat transmission To boiler First air or secondary wind so that it is heat up;Intermediary's water after cooling turns again to heat pump unit, the pot after intensification Stove First air or secondary wind enter air preheater and continue to heat up.
Cold end the most according to claim 3 is exhaust heat stepped utilizes energy conserving system, it is characterised in that boiler is once Wind or secondary wind heating system are a group or several groups of heating surfaces being arranged in after First air or overfire air fan in air channel, its knot Structure is made up of finned tube and header, including inlet portion and export department for accessing boiler First air or secondary air system; Intermediary's water accesses in finned tube.
Cold end the most according to claim 1 is exhaust heat stepped utilizes energy conserving system, it is characterised in that heating agent controls Ining succession and take hot systems in one end of system, the other end is ined succession heating system, including intermediary's water return pipe and intermediary's water oral siphon; Intermediary's water return pipe is additionally coupled to heat exchanger, by accessing boiler First air or secondary wind heating system after heat exchanger again Oral siphon;The return pipe of boiler First air or secondary wind heating system takes back intermediary's water oral siphon by after water pump.
Cold end the most according to claim 5 is exhaust heat stepped utilizes energy conserving system, it is characterised in that heat exchanger leads to Cross pipeline and regulation valve introduces auxiliary heating working medium, use steam or hot water auxiliary to add hot mediation water.
Cold end the most according to claim 5 is exhaust heat stepped utilizes energy conserving system, it is characterised in that taking heat system Bypass branch and regulation valve it is provided with between intermediary's water return pipe and intermediary's water oral siphon of unified side.
Cold end the most according to claim 5 is exhaust heat stepped utilizes energy conserving system, it is characterised in that heating agent controls System also includes water charging system, pressure fixing system, drainage.
9. cold end is exhaust heat stepped utilizes a power-economizing method, and when system is run, utilization takes hot systems and takes out from steam turbine The driving steam taking certain pressure enters heat pump;Heat pump work absorb access cooling-tower circulating water waste heat, heat from Intermediary's water in heating agent control system;It is characterized in that: the intermediary's water after heating accesses boiler First air or secondary wind adds Hot systems, is heated boiler First air or secondary wind by intermediary's water heat release;
When normal operation mode, heat pump unit takes between institute's calorific requirement of heat and heat boiler First air or secondary wind Keeping balance, intermediary's water of heating agent control system all carries out heat exchange transmission;
When compensating working method, heat pump unit takes shortage of heat, is added hot mediation water further by supplementary heat exchanger;
When bypass mode, it is too much that heat pump unit takes heat, and heat pump unit intermediary discharge is flow through in regulation, reduces Actual heat exchange amount.
Cold end the most according to claim 9 is exhaust heat stepped utilizes power-economizing method, it is characterised in that compensating work When making mode, utilize regulation valve to adjust and auxiliary heating is provided, it is ensured that boiler First air or the heating-up temperature of secondary wind;
When bypass mode, open the bypass in parallel taking hot systems side intermediary water heat absorbing end, utilize regulation valve to adjust Whole partial intermediary water is made not pass through heat pump unit.
CN201610583449.4A 2016-07-15 2016-07-15 Cold end waste heat cascade utilization energy-saving system and method Active CN106016241B (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1916506A (en) * 2006-09-06 2007-02-21 清华大学 Heating system by using circulating cooling water of power plant as low order heat source for heat pump
US20120240579A1 (en) * 2011-03-23 2012-09-27 Kabushiki Kaisha Toshiba Carbon-dioxide-recovery-type thermal power generation system and method of operating the same
CN103017236A (en) * 2012-12-25 2013-04-03 浙江工商大学 Condensation heat recycle and supply system of power plant
JP2013245841A (en) * 2012-05-23 2013-12-09 Pan Pacific Copper Co Ltd Method and system for utilizing waste heat in sulphuric acid production equipment
CN104235870A (en) * 2014-10-01 2014-12-24 冯留建 Condenser dead steam waste heat recovery and energy saving device and energy saving method
CN204554779U (en) * 2015-04-27 2015-08-12 刘崇江 Coal-fired station's bootstrap system
CN205979722U (en) * 2016-07-15 2017-02-22 大唐(北京)能源管理有限公司 Cold junction waste heat cascade utilization economizer system

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1916506A (en) * 2006-09-06 2007-02-21 清华大学 Heating system by using circulating cooling water of power plant as low order heat source for heat pump
US20120240579A1 (en) * 2011-03-23 2012-09-27 Kabushiki Kaisha Toshiba Carbon-dioxide-recovery-type thermal power generation system and method of operating the same
JP2013245841A (en) * 2012-05-23 2013-12-09 Pan Pacific Copper Co Ltd Method and system for utilizing waste heat in sulphuric acid production equipment
CN103017236A (en) * 2012-12-25 2013-04-03 浙江工商大学 Condensation heat recycle and supply system of power plant
CN104235870A (en) * 2014-10-01 2014-12-24 冯留建 Condenser dead steam waste heat recovery and energy saving device and energy saving method
CN204554779U (en) * 2015-04-27 2015-08-12 刘崇江 Coal-fired station's bootstrap system
CN205979722U (en) * 2016-07-15 2017-02-22 大唐(北京)能源管理有限公司 Cold junction waste heat cascade utilization economizer system

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