CN107270373A - One kind is classified cascade utilization heating system of drawing gas - Google Patents

One kind is classified cascade utilization heating system of drawing gas Download PDF

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Publication number
CN107270373A
CN107270373A CN201710660907.4A CN201710660907A CN107270373A CN 107270373 A CN107270373 A CN 107270373A CN 201710660907 A CN201710660907 A CN 201710660907A CN 107270373 A CN107270373 A CN 107270373A
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CN
China
Prior art keywords
heat
heat pump
steam turbine
steam
condenser
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Pending
Application number
CN201710660907.4A
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Chinese (zh)
Inventor
马正中
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China Mining Union Innovative Energy Group Co ltd
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Zhong Xin Xin Chuang (beijing) Electricity Sales Co Ltd
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Priority to CN201710660907.4A priority Critical patent/CN107270373A/en
Publication of CN107270373A publication Critical patent/CN107270373A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24DDOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00Hot-water central heating systems
    • F24D3/18Hot-water central heating systems using heat pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24DDOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00Details
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24DDOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2200/00Heat sources or energy sources
    • F24D2200/12Heat pump

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)

Abstract

Cascade utilization heating system of drawing gas is classified the invention discloses one kind, it includes steam turbine, cooling tower, condenser, the two-stage heat pump unit being made up of absorption heat pump and steam turbine compression heat pump and the two-stage heat exchanger unit being made up of vapor-water heat exchanger and Gateway Station in Heating Network.Low pressure steam line, which is drawn, from the low pressure (LP) cylinder of steam turbine is respectively connecting to absorption heat pump and Gateway Station in Heating Network, middle pressure steam is drawn from the intermediate pressure cylinder exhaust pipe of steam turbine to do work into steam turbine compression heat pump, entering back into turns into condensate after vapor-water heat exchanger heat release, two-stage heat pump unit is connected to the recirculated cooling water flowed out after recirculated cooling water pipeline, heat release and enters condenser progress circulation heat absorption.The present invention reclaims cold end waste heat by rationally being drawn gas using steam turbine classification, and the step for realizing hot net water using two-stage heat pump unit and two-stage heat exchanger unit is heated, and improves efficiency of energy utilization.

Description

One kind is classified cascade utilization heating system of drawing gas
Technical field
The invention belongs to the energy-saving field of power plant's cogeneration units, and in particular to one kind is classified cascade utilization heat supply of drawing gas System.
Background technology
China's cities and towns central heating is based on the cogeneration of heat and power of power plant.Power plant's cold end waste heat refers to condenser or Air-Cooling Island is cold But the heat that exhaust steam in steam turbine is taken away, this partial heat belongs to low-grade heat source, directly will cause huge to Environment release Energy waste.Simultaneously as China's town development and population increase, thermic load breach further increases, with the industry largely wasted Waste heat forms significant contradiction.With the fast development of heat pump techniques, particularly heat pump maximization technology reaches its maturity so that Power plant's cold end waste heat is reclaimed to be possibly realized for concentrated supply of heating in the city.
Heat pump is that one kind reclaims low grade heat energy for heat supply or heating by the use of high-grade heat energy as drive energy Equipment, be widely used in the fields such as power plant, oil, chemical industry and metallurgy.It is inevitable during the heat to power output of power plant There is intrinsic cold source energy in ground, modern power plants thermal efficiency of cycle is 40%-57%.The circulation of steam power plant is reclaimed using heat pump Water/exhaust steam cold end low temperature exhaust heat, can improve the heat-economy of power plant, with significant energy-saving effect.
Current power plant heat pump reclaims cold end waste heat and uses steam drive type lithium bromide absorption type heat pump unit, and steam turbine is low The driving heat source that the heating of cylinder pressure is drawn gas after desuperheat saturation as source pump.The heat supply network backwater absorption cycle come from user Gateway Station in Heating Network in factory is carried out after water or the waste heat of exhaust steam and carries out reheating, thermic load is then sent to again.
The content of the invention
Cascade utilization heating system of drawing gas is classified it is an object of the invention to provide one kind, it can utilize steam turbine classification Draw gas to reclaim cold end waste heat.
For up to this purpose, the present invention provides one kind and is classified cascade utilization heating system of drawing gas, it includes steam turbine, cooling Tower, condenser, the two-stage heat pump unit being made up of absorption heat pump and steam turbine compression heat pump and by steam water heat exchanger The two-stage heat exchanger unit constituted with Gateway Station in Heating Network, draws low pressure steam line from the low pressure (LP) cylinder of the steam turbine and is respectively connecting to The absorption heat pump and the Gateway Station in Heating Network, draw middle pressure steam from the intermediate pressure cylinder bleed steam pipework of the steam turbine and enter described Steam turbine compression heat pump does work, and entering back into turns into condensate, the two-stage heat pump unit after the steam water heat exchanger heat release Recirculated cooling water pipeline is connected to, the recirculated cooling water flowed out after the two-stage heat pump unit heat release enters into the condenser Row circulation heat absorption.
Further, the turbine discharge enters the condenser, is carried out in the condenser with recirculated cooling water Turn into condensate after heat exchange, the recirculated cooling water after heat absorption heating is cooled down into the cooling tower, and recycle stream Enter the condenser.
Further, the two-stage heat pump unit has circulating cooling water inlet and circulating cooling water out, passes through respectively Pipeline is connected to the recirculated cooling water inlet pipeline in the condenser downstream and the recirculated cooling water of the condenser upstream side Outlet pipeline, closed circulation system is constituted with the condenser.
Further, absorption heat pump also has a heat supply network backwater import, and there is the Gateway Station in Heating Network heat supply network to supply Water out, is respectively connecting to a heat supply network water return pipeline and a heat supply network supply channel outside plant area.
Further, a heat supply network backwater sequentially enters the absorption heat pump along a heat supply network water return pipeline and entered Row is heated for the first time, is entered back into the steam turbine formula heat pump and heat for the second time, enters back into the steam water heat exchanger and carry out Third time is heated, and is finally entered after the Gateway Station in Heating Network carries out the 4th heating and is sent into a heat supply network supply channel.
The present invention reclaims cold end waste heat by rationally being drawn gas using steam turbine classification, utilizes two-stage heat pump unit and two-stage Heat exchanger unit realizes the step heating of hot net water, so as to improve efficiency of energy utilization.
Brief description of the drawings
Fig. 1 is that a kind of classification of the embodiment of the present invention is drawn gas the principle schematic of cascade utilization heating system.
Wherein, the content that each reference is referred to is as follows:
1- steam turbines;2- cooling towers;3- condensers;4- absorption heat pumps;Heat supply network water return pipeline of 5-;Heat supply network of 6- Supply channel;7- low pressure steam lines;8- intermediate pressure cylinder bleed steam pipeworks;9- recirculated cooling water inlet pipelines;10- recirculated cooling waters go out Water lines;11- steam turbine compression heat pumps;12- steam water heat exchangers;13- Gateway Station in Heating Network.
Embodiment
Technical scheme is further described below in conjunction with the accompanying drawings and by specific embodiment, it will be appreciated that Content described herein is merely to illustrate and explain the present invention, and is not intended to limit the present invention.
As shown in figure 1, the classification in the embodiment of the present invention is drawn gas, cascade utilization heating system includes steam turbine 1, cooling tower 2nd, condenser 3, the two-stage heat pump unit that is made up of absorption heat pump 4 and steam turbine compression heat pump 11 and changed by vapour-water The two-stage heat exchanger unit that hot device 12 and Gateway Station in Heating Network 13 are constituted.
Steam turbine 1 is steam-type steam turbine, is connected between its exhaust steam outlet and condenser 3 by pipeline, station boiler The high-temperature steam of output enters discharge exhaust steam after steam turbine 1 does work and enters condenser 3, enters in condenser 3 with recirculated cooling water Turn into condensate after row heat exchange, the recirculated cooling water after heat absorption heating is cooled down into cooling tower 2, and circulates inflow Condenser 3.
Low pressure steam line 7, which is drawn, from the low pressure (LP) cylinder of steam turbine 1 is respectively connecting to absorption heat pump 4 and Gateway Station in Heating Network 13, From the intermediate pressure cylinder bleed steam pipework 8 of steam turbine 1 middle pressure steam is drawn to do work into steam turbine compression heat pump 11, enter back into vapour- Turn into condensate after the heat release of water- to-water heat exchanger 12, two-stage heat pump unit is connected to recirculated cooling water pipeline, put from two-stage heat pump unit The recirculated cooling water flowed out after heat enters condenser and carries out circulation heat absorption.
Two-stage heat pump unit has circulating cooling water inlet and circulating cooling water out, is respectively connecting to the downstream of condenser 3 The recirculated cooling water inlet pipeline 9 of side and the recirculated cooling water outlet pipeline 10 of the upstream side of condenser 3, are closed with the composition of condenser 3 The formula circulatory system.
Absorption heat pump 4 in the present embodiment is lithium bromide absorption type heat pump, and absorption heat pump 4 is a kind of using low-grade The circulatory system that thermal source pumps heat from low-temperature heat source to high temperature heat source, is the efficient apparatus for recycling low grade heat energy, Double action with the saving energy, environmental protection.Steam turbine compression heat pump 11 drives turbine by high temperature and high pressure steam Machine, the mechanical energy that the thermal energy of steam is rotated into turbine rotor drives compressor operating and realizes and heat circulation.Heat pump is transported Capable power comes from high steam, and steam is after turbine acting, and steam discharge enters steam water heat exchanger 12, further lifts heat supply The temperature of hot water.
Absorption heat pump 4 has a heat supply network backwater import, and Gateway Station in Heating Network 13 has a heat supply network service water outlet, the two point A heat supply network water return pipeline 5 and a heat supply network supply channel 6 outside plant area are not connected to.Heat supply network backwater is along once warm Net water return pipeline 5 sequentially enters absorption heat pump 4 and carries out first time heating, enters back into steam turbine formula heat pump 11 and carries out second Heating, enters back into steam water heat exchanger 12 and carries out third time heating, finally enters after Gateway Station in Heating Network 13 carries out the 4th heating and sends into Heat supply network supply channel 6.
Classification in the embodiment of the present invention draw gas cascade utilization heating system by rationally using steam turbine classification draw gas come Cold end waste heat is reclaimed, the step for realizing hot net water using two-stage heat pump unit and two-stage heat exchanger unit is heated, so as to improve Efficiency of energy utilization.
Classification in present invention cascade utilization heating system of drawing gas is not limited to steam power plant using steam turbine, it can also be used to adopt With the steam power plant of Combined cycle gas-steam turbine unit;It is not limited to reclaim the heat pump of circulating cooling water afterheat, it can also be used to weary The heat pump of the cold end low-temperature heat source waste heat recovery such as vapour.
Note, the technical principle that above are only presently preferred embodiments of the present invention and used.Those skilled in the art can manage Solution, the invention is not restricted to specific embodiment described here, can carry out various obvious changes for a person skilled in the art Change, readjust and substitute without departing from protection scope of the present invention.Therefore, although the present invention is entered by above example Go and be described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept, Other more equivalent embodiments can also be included, and the scope of the present invention is determined by scope of the appended claims.

Claims (5)

  1. The cascade utilization heating system 1. one kind classification is drawn gas, it is characterised in that including steam turbine (1), cooling tower (2), condenser (3) the two-stage heat pump unit that, is made up of absorption heat pump (4) and steam turbine compression heat pump (11) and exchanged heat by vapour-water The two-stage heat exchanger unit of device (12) and Gateway Station in Heating Network (13) composition, low-pressure steam is drawn from the low pressure (LP) cylinder of the steam turbine (1) Pipeline (7) is respectively connecting to the absorption heat pump (4) and the Gateway Station in Heating Network (13), the intermediate pressure cylinder from the steam turbine (1) Bleed steam pipework (8) is drawn middle pressure steam and done work into the steam turbine compression heat pump (11), enters back into the vapour-water heat exchange Turn into condensate after device (12) heat release, the two-stage heat pump unit is connected to recirculated cooling water pipeline, from the two-stage heat pump list The recirculated cooling water flowed out after first heat release enters condenser (3) and carries out circulation heat absorption.
  2. The cascade utilization heating system 2. classification according to claim 1 is drawn gas, it is characterised in that steam turbine (1) row Vapour enters condenser (3), is carried out in the condenser (3) with recirculated cooling water after heat exchange as condensate, heat absorption heating Recirculated cooling water afterwards is cooled down into the cooling tower (2), and circulates the inflow condenser (3).
  3. The cascade utilization heating system 3. classification according to claim 1 is drawn gas, it is characterised in that the two-stage heat pump unit With circulating cooling water inlet and circulating cooling water out, the circulation by being connected to the condenser (3) downstream is cold respectively But water inlet pipeline (9) and the recirculated cooling water outlet pipeline (10) of the condenser (3) upstream side, with the condenser (3) Constitute closed circulation system.
  4. The cascade utilization heating system 4. classification according to claim 1 is drawn gas, it is characterised in that the absorption heat pump (4) also there is a heat supply network backwater import, the Gateway Station in Heating Network (13) has a heat supply network service water outlet, is respectively connecting to plant area An outside heat supply network water return pipeline (5) and a heat supply network supply channel (6).
  5. 5. classification according to claim 4 is drawn gas cascade utilization heating system, it is characterised in that a heat supply network backwater along Heat supply network water return pipeline (5) sequentially enters the absorption heat pump (4) and carries out first time heating, enters back into the steam Turbo compressor formula heat pump (11) carries out second and heated, and enters back into the steam water heat exchanger (12) and carries out third time heating, finally A heat supply network supply channel (6) is sent into after carrying out the 4th heating into the Gateway Station in Heating Network (13).
CN201710660907.4A 2017-08-04 2017-08-04 One kind is classified cascade utilization heating system of drawing gas Pending CN107270373A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113237134A (en) * 2021-06-08 2021-08-10 西安热工研究院有限公司 Geothermal energy central heating system based on electric heating pump unit
CN113280390A (en) * 2021-05-17 2021-08-20 浙江大学 Deep peak regulation heat supply grade improving system and method based on heat pump boosting reheating
CN114777184A (en) * 2022-03-30 2022-07-22 西安热工研究院有限公司 Multistage heating system and method for circulating water of heat supply network

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101619662A (en) * 2009-08-14 2010-01-06 清华大学 Method for recovering waste heat of thermal power plant and heating and supplying heat to hot water in a stepping way
CN101793171A (en) * 2009-12-21 2010-08-04 江苏双良空调设备股份有限公司 Combined heat and power system for directly recovering exhaust afterheat of power station steam turbine by absorption heat pump
KR20130034898A (en) * 2011-09-29 2013-04-08 하이에어코리아 주식회사 Warm water system of cascade cycle heat pump
CN205477781U (en) * 2016-01-26 2016-08-17 华北电力大学 Power plant boiler fan heater vapour source optimizing system of integrated injection formula heat pump
CN205825668U (en) * 2016-05-09 2016-12-21 华北电力大学 A kind of integrated flue gas and the two-stage brown coal drying system of steam drying
CN207648903U (en) * 2017-08-04 2018-07-24 中能信创(北京)售电有限公司 A kind of classification steam extraction cascade utilization heating system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101619662A (en) * 2009-08-14 2010-01-06 清华大学 Method for recovering waste heat of thermal power plant and heating and supplying heat to hot water in a stepping way
CN101793171A (en) * 2009-12-21 2010-08-04 江苏双良空调设备股份有限公司 Combined heat and power system for directly recovering exhaust afterheat of power station steam turbine by absorption heat pump
KR20130034898A (en) * 2011-09-29 2013-04-08 하이에어코리아 주식회사 Warm water system of cascade cycle heat pump
CN205477781U (en) * 2016-01-26 2016-08-17 华北电力大学 Power plant boiler fan heater vapour source optimizing system of integrated injection formula heat pump
CN205825668U (en) * 2016-05-09 2016-12-21 华北电力大学 A kind of integrated flue gas and the two-stage brown coal drying system of steam drying
CN207648903U (en) * 2017-08-04 2018-07-24 中能信创(北京)售电有限公司 A kind of classification steam extraction cascade utilization heating system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113280390A (en) * 2021-05-17 2021-08-20 浙江大学 Deep peak regulation heat supply grade improving system and method based on heat pump boosting reheating
CN113237134A (en) * 2021-06-08 2021-08-10 西安热工研究院有限公司 Geothermal energy central heating system based on electric heating pump unit
CN113237134B (en) * 2021-06-08 2023-08-18 西安热工研究院有限公司 Geothermal energy central heating system based on electric heat pump unit
CN114777184A (en) * 2022-03-30 2022-07-22 西安热工研究院有限公司 Multistage heating system and method for circulating water of heat supply network
CN114777184B (en) * 2022-03-30 2024-04-09 西安热工研究院有限公司 Multistage heating system and method for heat supply network circulating water

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Effective date of registration: 20191015

Address after: 100022 Beijing Chaoyang District East Third Ring Road No. 9 2603-01

Applicant after: China Mining Union Innovative Energy Group Co.,Ltd.

Address before: Ji Yang Village 102422 Beijing city Fangshan District Shilou town meeting West 210 meters

Applicant before: ZHONG NENG XIN CHUANG (BEIJING) ELECTRICITY SALES Co.,Ltd.

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Application publication date: 20171020

RJ01 Rejection of invention patent application after publication