CN108361797B - High-temperature heat storage type electric power peak regulation cogeneration waste heat recovery device and method - Google Patents

High-temperature heat storage type electric power peak regulation cogeneration waste heat recovery device and method Download PDF

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CN108361797B
CN108361797B CN201810141514.7A CN201810141514A CN108361797B CN 108361797 B CN108361797 B CN 108361797B CN 201810141514 A CN201810141514 A CN 201810141514A CN 108361797 B CN108361797 B CN 108361797B
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valve
temperature
unit
storage tank
waste heat
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CN108361797A (en
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王笑吟
华靖
付林
赵玺灵
张世钢
江亿
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Tsinghua University
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    • 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
    • F24D3/02Hot-water central heating systems with forced circulation, e.g. by 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
    • F24D19/10Arrangement or mounting of control or safety devices
    • F24D19/1006Arrangement or mounting of control or safety devices for water heating systems
    • F24D19/1009Arrangement or mounting of control or safety devices for water heating systems for central heating
    • F24D19/1015Arrangement or mounting of control or safety devices for water heating systems for central heating using a valve or valves
    • 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
    • F24D19/10Arrangement or mounting of control or safety devices
    • F24D19/1006Arrangement or mounting of control or safety devices for water heating systems
    • F24D19/1009Arrangement or mounting of control or safety devices for water heating systems for central heating
    • F24D19/1039Arrangement or mounting of control or safety devices for water heating systems for central heating the system uses a heat pump
    • 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
    • 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
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/52Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
    • 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]

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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)
  • Heat-Pump Type And Storage Water Heaters (AREA)
  • Steam Or Hot-Water Central Heating Systems (AREA)

Abstract

The invention relates to a high-temperature heat storage type peak shaving power cogeneration waste heat recovery device and a method. The method adjusts the operation mode of the device through different valve switch combinations, so that the device can respectively operate in the low-ebb period and the high-peak period of the electric load. The invention solves the problem of limited power generation capacity caused by the mode of 'fixing power with heat' of the thermal power plant system, and increases the power regulation capacity. Meanwhile, the low-temperature water storage tank is used for storing all or part of the waste steam waste heat in the peak period of the electric load, the high-temperature water storage tank is used for storing high-temperature hot water in the valley period of the electric load, steam extraction of a cogeneration unit is replaced in the peak period of the electric load, the high-temperature water storage tank is used as a driving heat source of the absorption heat pump, the waste steam heat is recovered, and high-grade heat is essentially transferred to the peak period of the electric load to do work, so that the storage temperature difference is increased, and the volume of the water storage tank can be obviously.

Description

High-temperature heat storage type electric power peak regulation cogeneration waste heat recovery device and method
Technical Field
The invention relates to a heat exchange device and a heat exchange method, in particular to a high-temperature heat storage type electric peak shaving cogeneration waste heat recovery device and a high-temperature heat storage type electric peak shaving cogeneration waste heat recovery method which combine a high-temperature heat storage technology with cogeneration and waste heat recovery of a power plant, and belongs to the technical field of energy power.
Background
At present, the phenomenon of 'wind abandon' of electric power in northern areas of China is serious, and the phenomenon mainly occurs in winter heating seasons. The cogeneration adopts the mode of 'fixing power by heat' to operate, and in order to ensure heat supply, the regulation of the generated output is greatly limited and can not be peak shaving for electric power. Meanwhile, the power consumption is reduced due to the adjustment of the industrial structure. In winter, the demand side uses a lot of heat, and the power consumption is few, and its thermoelectric ratio is greater than combined heat and power's thermoelectric ratio, leads to the electric power supply not to go out, only need reduce the generated energy through the mode that reduces the heat supply volume, leads to the heat source not enough, has caused the unmatched problem of thermoelectric ratio.
The Chinese invention patent with the patent number of 201410071808.9 discloses an electric peak regulation cogeneration waste heat recovery device and an operation method thereof, the device consists of an internal power plant part and a heat exchange station part, wherein the internal power plant part comprises a heat exchanger, a waste heat recovery electric heating pump, an energy storage electric heating pump, a high/low temperature water storage tank, a heat network heater, a valve and a circulating water pump, and the heat exchange station part mainly comprises the high/low temperature water storage tank, the electric heating pump, the heat exchanger, the valve and the circulating water pump. The operation method of the device is that different valve switch combinations are adopted, so that the device can be respectively operated in the periods of low valley of electric load, flat peak of electric load and high peak of electric load, the heat storage device is used for storing redundant heat in the period of low valley of electric load, and the heat is supplemented to the heat supply network in the period of high peak of electric load. The invention breaks through the traditional 'fixed power by heat' operation mode of cogeneration, realizes the heat and power decoupling, and realizes the regulation of electric power while stably supplying heat and recovering waste heat. However, the idea of the invention is that the low-grade heat in the peak period of the electric load is stored in the low-temperature water storage tank and is transferred to the night to be processed by the high-grade heat, so that the heat storage device has small storage temperature difference, large capacity and high initial investment of equipment.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a high-temperature heat storage type peak shaving power cogeneration waste heat recovery device and method that combine a high-temperature heat storage technology with cogeneration and power plant waste heat recovery, so as to realize the peak shaving operation of the cogeneration unit on the basis of waste heat recovery.
In order to achieve the purpose, the invention adopts the following technical scheme: a high-temperature heat storage type peak shaving cogeneration waste heat recovery device is characterized by mainly comprising a low-temperature water storage tank (1), a heat exchange unit (2), a waste heat recovery unit (3), a waste heat recovery unit (4), a heat exchange unit (5), a high-temperature water storage tank (6), a heat exchange unit (7), circulating water pumps (8-10) and valves (11-22); wherein, the primary network water return pipeline is connected with an inlet of the circulating water pump (8), an inlet of the circulating water pump (9) and a valve (18) in parallel, and an outlet of the circulating water pump (9) is connected with a bottom connector of the low-temperature water storage tank (1) in parallel through the valve (19) and the valve (18); the top interface of the low-temperature water storage tank (1) is divided into four paths which are respectively connected with the outlet of the waste heat recovery unit (3), the outlet of the waste heat recovery unit (4), the valve (15) and the valve (20) in parallel; an outlet of the circulating water pump (8) is connected with a valve (11) and a valve (12) in parallel, the valve (11) is connected with an inlet of the heat exchanger unit (2), an outlet of the heat exchanger unit (2) is connected with the valve (12) in parallel, the valve (13) is connected with an inlet of the waste heat recovery unit (3), and the valve (14) is connected with an inlet of the waste heat recovery unit (4); the bottom interface of the high-temperature water storage tank (6) is connected with the valve (20) and the inlet of the circulating water pump (10) in parallel, and the outlet of the circulating water pump (10) is connected with the inlet of the heat exchanger unit (7) through the valve (21); the top interface of the high-temperature water storage tank (6) is connected with the outlet and the valve (22) of the heat exchanger unit (7) in parallel, the valve (22) is connected with the generator inlet of the waste heat recovery unit (3), the generator outlet and the valve (15) of the waste heat recovery unit (3) are connected with the valve (16) and the valve (17) in parallel, the valve (16) is connected with the inlet of the heat exchanger unit (5), and the outlet and the valve (17) of the heat exchanger unit (5) are connected with the primary network water supply pipeline in parallel.
In a preferred embodiment, a condenser or a second-class absorption heat exchanger is adopted as heat exchange equipment in the heat exchange unit (2), and the heat exchange equipment is connected in series or in parallel; the heat exchange equipment in the waste heat recovery unit (4) adopts a steam-water heat exchanger, an absorption heat pump or a compression heat pump, and the heat exchange equipment is connected in series or in parallel; the heat exchange unit (7) adopts a steam-water heat exchanger or a second-class absorption heat exchanger, and the heat exchange equipment is connected in series or in parallel.
The method for recovering the waste heat of the peak shaving cogeneration of electric power by adopting the device is characterized in that the operation mode of the device is adjusted by different valve switch combinations, so that the device can respectively operate in the time periods of low ebb and high peak of electric load:
1) electric load low ebb period: when the cogeneration unit operates under the pumping and condensing working condition, the valve (12), the valve (13), the valve (17), the valve (18), the valve (20) and the valve (22) are closed, the valve (11), the valve (14-16), the valve (19), the valve (21) and the circulating water pump (8-10) are opened, primary network low-temperature backwater supplied out through a primary network backwater pipeline is divided into two paths, one path enters from a bottom connector of the low-temperature water storage tank (1) through the circulating water pump (9), and water stored in the low-temperature water storage tank (1) is pressed out from a top connector; the other path of the waste heat recovery water enters a heat exchange unit (2) and a waste heat recovery unit (4) in sequence through a circulating water pump (8); primary network water flowing out of a top connector of the waste heat recovery unit (4) and the low-temperature water storage tank (1) is mixed and then enters the heat exchange unit (5), is heated to the design temperature of a heat network by high-temperature steam of the cogeneration unit to obtain primary network high-temperature water supply, and flows into a primary network water supply pipeline to be supplied out; meanwhile, the stored water in the high-temperature water storage tank (6) is pumped out from the bottom connector through a circulating water pump (10) and flows into a heat exchange unit (7), and is heated by high-temperature steam of the cogeneration unit and then returns to the high-temperature water storage tank (6) from the top connector;
2) during peak hours of electric load: when the cogeneration unit operates under the condensation pumping working condition, the valve (12), the valve (15), the valve (17), the valve (19), the valve (21), the circulating water pump (9) and the circulating water pump (10) are closed, the valve (11), the valve (13), the valve (14), the valve (16), the valve (18), the valve (20), the valve (22) and the circulating water pump (8) are opened, the stored water in the low-temperature water storage tank (1) flows out from a bottom connector, is mixed with primary network low-temperature return water supplied by a primary network return water pipeline, then enters the heat exchange unit (2) through the circulating water pump (8), then is connected in parallel to enter the waste heat recovery unit (3) and the waste heat recovery unit (4) to be mixed and divided into two paths, one path flows in from the top connector of the low-temperature water storage tank (1), the other path flows in from the bottom connector of the high-temperature water storage tank (6), the stored water in the high-temperature water storage tank (6, the cooled water enters a heat exchange unit (5), is heated to the design temperature of a heat supply network by high-temperature steam of the cogeneration unit to obtain primary network high-temperature water supply, and flows into a primary network water supply pipeline to be supplied out.
In a preferred embodiment, in the valley period of the electric load, when the cogeneration operates in the pumping and condensing condition, the valve (11) is closed and the valve (12) is opened, one path of the primary network backwater enters the waste heat recovery unit (4) and then is mixed with the stored water which is pressed out from the top connector of the low-temperature water storage tank (1).
In a preferred embodiment, during the peak period of the electric load, when the cogeneration operates in the condensing condition, the valve (11) is closed and the valve (12) is opened, and the primary net backwater sequentially enters the waste heat recovery unit (3) and the waste heat recovery unit (4).
In a preferred embodiment, during the peak period of electric load, when the cogeneration runs under the extraction condensing or pure condensing working condition, the valve (16) is closed and the valve (17) is opened, the stored water in the high-temperature water storage tank (6) is pressed out from the top connector to enter a generator of the waste heat recovery unit (3), and after the stored water is cooled to the design temperature of a heat supply network, primary network high-temperature water supply is obtained and flows into a primary network water supply pipeline to be supplied out.
In a preferred embodiment, in the valley period of the electric load, when the cogeneration operates under the back pressure working condition, the valve (11), the valve (12), the valve (14) and the circulating water pump (8) are closed, the primary network backwater completely enters from the bottom connector of the low-temperature water storage tank (1) through the circulating water pump (9), the stored water in the low-temperature water storage tank (1) is pressed out from the top connector and then enters the heat exchange unit (5), and the primary network high-temperature water supply is obtained after the primary network backwater is heated to the design temperature of the heat network by the high-temperature steam of the cogeneration unit and flows into the primary network water supply pipeline to be supplied out.
In a preferred embodiment, during the peak period of the electric load, when the cogeneration operates in the condensing condition, the valve (11) is closed, the valve (12) is opened, the valve (14) is closed, and the primary network backwater enters the waste heat recovery unit (3).
In a preferred embodiment, during the peak period of the electric load, when the cogeneration operates in the extraction and condensation working condition, the valve (14) is closed, and the primary net backwater enters the heat exchange unit (2) and the waste heat recovery unit (3).
A high-temperature heat storage type peak shaving cogeneration waste heat recovery device is characterized by mainly comprising a low-temperature water storage tank (1), a heat exchange unit (2), a waste heat recovery unit (3), a waste heat recovery unit (4), a heat exchange unit (5), a high-temperature water storage tank (6), a heat exchange unit (7), circulating water pumps (8-10) and valves (11-24); wherein, the primary network water return pipeline is connected with an inlet of the circulating water pump (8), an inlet of the circulating water pump (9) and a valve (18) in parallel, and an outlet of the circulating water pump (9) is connected with a bottom connector of the low-temperature water storage tank (1) in parallel through the valve (19) and the valve (18); the top interface of the low-temperature water storage tank (1) is divided into four paths which are respectively connected with the outlet of the waste heat recovery unit (4), the valve (15), the valve (20) and the valve (24) in parallel; an outlet of the circulating water pump (8) is connected with a valve (11) and a valve (12) in parallel, the valve (11) is connected with an inlet of the heat exchanger unit (2), an outlet of the heat exchanger unit (2) is connected with the valve (12) in parallel, the valve (13) is connected with an inlet of the waste heat recovery unit (3), an outlet of the waste heat recovery unit (3) is connected with the valve (14) in parallel, the valve (23) is connected with an inlet of the waste heat recovery unit (4); the bottom interface of the high-temperature water storage tank (6) is connected with the valve (20) and the inlet of the circulating water pump (10) in parallel, and the outlet of the circulating water pump (10) is connected with the inlet of the heat exchanger unit (7) through the valve (21); the top interface of the high-temperature water storage tank (6) is connected with the outlet and the valve (22) of the heat exchanger unit (7) in parallel, the valve (22) is connected with the generator inlet of the waste heat recovery unit (3), the generator outlet of the waste heat recovery unit (3) is connected with the valve (15) in parallel, the valve (16) is connected with the inlet of the heat exchanger unit (5), and the outlet of the heat exchanger unit (5) is connected with the valve (17) in parallel to form a primary network water supply pipeline.
In a preferred embodiment, a condenser or a second-class absorption heat exchanger is adopted as heat exchange equipment in the heat exchange unit (2), and the heat exchange equipment is connected in series or in parallel; the heat exchange equipment in the waste heat recovery unit (4) adopts a steam-water heat exchanger, an absorption heat pump or a compression heat pump, and the heat exchange equipment is connected in series or in parallel; the heat exchange unit (7) adopts a steam-water heat exchanger or a second-class absorption heat exchanger, and the heat exchange equipment is connected in series or in parallel.
The method for recovering the waste heat of the peak shaving cogeneration of electric power by adopting the device is characterized in that the operation mode of the device is adjusted by different valve switch combinations, so that the device can respectively operate in the time periods of low ebb and high peak of electric load:
1) electric load low ebb period: when the cogeneration unit operates under the pumping and condensing working condition, the valve (12), the valve (13), the valve (17), the valve (18), the valve (20), the valve (22) and the valve (24) are closed, the valve (11), the valve (14-16), the valve (19), the valve (21), the valve (23) and the circulating water pump (8-10) are opened, primary network low-temperature backwater supplied out through a primary network backwater pipeline is divided into two paths, one path enters from a bottom connector of the low-temperature water storage tank (1) through the circulating water pump (9), and water stored in the low-temperature water storage tank (1) is pressed out from a top connector; the other path of the waste heat recovery water enters a heat exchange unit (2) and a waste heat recovery unit (4) in sequence through a circulating water pump (8); the primary network backwater flowing out of the top interfaces of the waste heat recovery unit (4) and the low-temperature water storage tank (1) is mixed and then enters the heat exchange unit (5), and is heated to the design temperature of a heat network by high-temperature steam of the cogeneration unit to obtain primary network high-temperature water supply, and flows into a primary network water supply pipeline to be supplied out; meanwhile, the stored water in the high-temperature water storage tank (6) is pumped out from the bottom connector through a circulating water pump (10) and flows into a heat exchange unit (7), and is heated by high-temperature steam of the cogeneration unit and then returns to the high-temperature water storage tank (6) from the top connector;
2) during peak hours of electric load: when the cogeneration unit operates under the pumping and condensing working condition, the valve (12), the valve (14), the valve (15), the valve (17), the valve (19), the valve (21), the valve (24), the circulating water pump (9) and the circulating water pump (10) are closed, the valve (11), the valve (13), the valve (16), the valve (18), the valve (20), the valve (22), the valve (23) and the circulating water pump (8) are opened, the stored water in the low-temperature water storage tank (1) flows out from a bottom connector, the mixed low-temperature return water is mixed with the low-temperature return water of the primary network supplied by the primary network return water pipeline, and then sequentially enters the heat exchange unit (2), the waste heat recovery unit (3) and the waste heat recovery unit (4) through the circulating water pump (8), and then is divided into two paths, wherein one path flows in from a top interface of the low-temperature water storage tank (1), and the other path flows in from a bottom interface of the high-temperature water storage tank (6); the water storage in the high-temperature water storage tank (6) is pressed out from the top connector to enter a generator of the waste heat recovery unit (3), is cooled and then enters the heat exchange unit (5), is heated to the design temperature of a heat supply network by high-temperature steam of the cogeneration unit to obtain primary network high-temperature water supply, and flows into a primary network water supply pipeline to be supplied out.
In a preferred embodiment, in the valley period of the electric load, when the cogeneration operates in the pumping and condensing condition, the valve (11) is closed and the valve (12) is opened, one path of the primary network backwater enters the waste heat recovery unit (4) and then is mixed with the stored water which is pressed out from the top connector of the low-temperature water storage tank (1).
In a preferred embodiment, during the peak period of the electric load, when the cogeneration operates in the condensing condition, the valve (11) is closed and the valve (12) is opened, and the primary net backwater sequentially enters the waste heat recovery unit (3) and the waste heat recovery unit (4).
In a preferred embodiment, during the peak period of electric load, when the cogeneration runs under the pure condensation condition, the valve (16) is closed and the valve (17) is opened, the stored water in the high-temperature water storage tank (6) is pressed out from the top connector and enters the generator of the waste heat recovery unit (3), and after being cooled to the design temperature of the heat supply network, primary network high-temperature water supply is obtained and flows into the primary network water supply pipeline to be supplied out.
In a preferred embodiment, in the valley period of the electric load, when the cogeneration operates in the pumping and condensing condition, the valve (23) is closed and the valve (24) is opened, and one path of primary network backwater enters the waste heat recovery unit (2) and then is mixed with the stored water which is pressed out from the top connector of the low-temperature water storage tank (1).
In a preferred embodiment, in the valley period of the electric load, when the cogeneration operates under the back pressure working condition, the valve (11), the valve (12), the valve (13), the valve (14), the valve (23), the valve (24) and the circulating water pump (8) are closed, the return water of the primary network completely enters from the bottom connector of the low-temperature water storage tank (1) through the circulating water pump (9), the stored water in the low-temperature water storage tank (1) is pressed out from the top connector and then enters the heat exchange unit (5), the high-temperature steam heated by the cogeneration unit is heated to the design temperature of the heat network to obtain the high-temperature water supply of the primary network, and the high-temperature water supply of the primary network flows into a water supply pipeline.
In a preferred embodiment, during the peak period of the electric load, when the cogeneration operates in the condensing condition, the valve (11) is closed and the valve (12) is opened, the valve (23) is closed and the valve (24) is opened, and the primary network backwater enters the waste heat recovery unit (3).
In a preferred embodiment, during the peak period of the electric load, when the cogeneration operates in the condensing condition, the valve (11) is opened and the valve (12) is closed, the valve (23) is closed and the valve (24) is opened, and the primary network backwater enters the heat exchange unit (2) and the waste heat recovery unit (3).
Due to the adoption of the technical scheme, the invention has the following advantages: 1. the waste heat recovery device comprises a high-temperature water storage tank, a low-temperature water storage tank, a heat exchange unit, a valve, a circulating water pump and the like, the power generation output of a power plant is adjusted by operating a cogeneration unit under pure condensation, extraction condensation or back pressure working conditions during the peak and valley of electric load, simultaneously the waste steam waste heat of a recovery system is ensured, the heat supply efficiency is improved, the problem of limited power generation capacity caused by a mode of 'fixing power with heat' of a thermal power plant system is solved, and the power adjustment capacity is increased. 2. The low-temperature water storage tank is used for storing all or part of exhaust steam waste heat in the peak period of the electric load, the high-temperature water storage tank is used for storing high-temperature hot water in the valley period of the electric load, steam extraction of a cogeneration unit is replaced in the peak period of the electric load, the high-temperature hot water is used as a driving heat source of the absorption heat pump to recover the exhaust steam heat, high-grade heat is essentially transferred to the peak period of the electric load to do work, and compared with the existing electric power peak-regulating cogeneration waste heat recovery system, the storage temperature difference is increased, and the volume of the water storage tank can be remarkably reduced.
Drawings
FIG. 1 is a schematic structural diagram of a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a second embodiment of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and examples. It is to be understood, however, that the drawings are provided solely for the purposes of promoting an understanding of the invention and that they are not to be construed as limiting the invention.
The first embodiment is as follows:
as shown in fig. 1, the high-temperature heat storage type peak shaving power cogeneration waste heat recovery device provided by this embodiment mainly comprises a low-temperature water storage tank 1, a heat exchanger unit 2, a waste heat recovery unit 3, a waste heat recovery unit 4, a heat exchanger unit 5, a high-temperature water storage tank 6, a heat exchanger unit 7, circulating water pumps 8-10, and valves 11-22. Wherein, the primary net water return pipeline 1-1 is connected in parallel with the inlet of the circulating water pump 8, the inlet of the circulating water pump 9 and the valve 18, and the outlet of the circulating water pump 9 is connected in parallel with the valve 18 through the valve 19 and the bottom interface of the low-temperature water storage tank 1. The top interface of the low-temperature water storage tank 1 is divided into four paths which are respectively connected with the outlet of the waste heat recovery unit 3, the outlet of the waste heat recovery unit 4, the valve 15 and the valve 20 in parallel. An outlet of the circulating water pump 8 is connected with a valve 11 and a valve 12 in parallel, the valve 11 is connected with an inlet of the heat exchanger unit 2, an outlet of the heat exchanger unit 2 is connected with the valve 12 in parallel with a valve 13 and a valve 14, the valve 13 is connected with an inlet of the waste heat recovery unit 3, and the valve 14 is connected with an inlet of the waste heat recovery unit 4. The bottom interface of the high-temperature water storage tank 6 is connected with the valve 20 and the inlet of the circulating water pump 10 in parallel, and the outlet of the circulating water pump 10 is connected with the inlet of the heat exchanger unit 7 through the valve 21. The top interface of the high-temperature water storage tank 6 is connected with the outlet of the heat exchanger unit 7 and the valve 22 in parallel, the valve 22 is connected with the generator inlet of the waste heat recovery unit 3, the generator outlet of the waste heat recovery unit 3 and the valve 15 are connected with the valve 16 and the valve 17 in parallel, the valve 16 is connected with the inlet of the heat exchanger unit 5, and the outlet of the heat exchanger unit 5 and the valve 17 are connected with the primary network water supply pipeline 1-2 in parallel.
In a preferred embodiment, the heat exchange equipment in the heat exchange unit 2 adopts a condenser or a second-class absorption heat exchanger, and the heat exchange equipment can be connected in series or in parallel.
In a preferred embodiment, the heat exchange device in the waste heat recovery unit 4 adopts a steam-water heat exchanger, an absorption heat pump or a compression heat pump, and the heat exchange devices can be connected in series or in parallel.
In a preferred embodiment, the heat exchanger unit 7 is a steam-water heat exchanger or a second type absorption heat exchanger, and the heat exchange devices can be connected in series or in parallel.
Based on the high-temperature heat storage type peak shaving cogeneration waste heat recovery device provided in the above embodiment, the invention also provides a high-temperature heat storage type peak shaving cogeneration waste heat recovery method, which adjusts the operation mode of the waste heat recovery device through different valve switch combinations to respectively operate in the electricity load valley and the electricity load peak period:
1) electric load low ebb period: when the cogeneration unit operates under the pumping and condensing working condition, closing the valve 12, the valve 13, the valve 17, the valve 18, the valve 20 and the valve 22, opening the valve 11, the valve 14-16, the valve 19, the valve 21 and the circulating water pump 8-10, dividing primary network low-temperature backwater supplied out through the primary network backwater pipeline 1-1 into two paths, wherein one path enters from a bottom connector of the low-temperature water storage tank 1 through the circulating water pump 9, and the stored water in the low-temperature water storage tank 1 is pressed out from a top connector; the other path of the waste heat recovery water enters the heat exchange unit 2 and the waste heat recovery unit 4 in sequence through a circulating water pump 8; mixing the primary network water flowing out of the waste heat recovery unit 4 and the top connector of the low-temperature water storage tank 1, then feeding the mixed water into the heat exchange unit 5, heating the mixed water to the design temperature of a heat supply network by high-temperature steam of the cogeneration unit to obtain primary network high-temperature water supply, and feeding the primary network high-temperature water supply into the primary network water supply pipeline 1-2 to be supplied; meanwhile, the stored water in the high-temperature water storage tank 6 is pumped out from the bottom connector through the circulating water pump 10 and flows into the heat exchange unit 7, and is heated by the high-temperature steam of the cogeneration unit and then returns to the high-temperature water storage tank 6 from the top connector.
2) During peak hours of electric load: when the cogeneration unit operates under the condensing condition, the valve 12, the valve 15, the valve 17, the valve 19, the valve 21, the circulating water pump 9 and the circulating water pump 10 are closed, the valve 11, the valve 13, the valve 14, the valve 16, the valve 18, the valve 20, the valve 22 and the circulating water pump 8 are opened, the stored water in the low-temperature water storage tank 1 flows out from a bottom interface, is mixed with the primary network low-temperature return water supplied by the primary network return water pipeline 1-1 and then enters the heat exchange unit 2 through the circulating water pump 8, then is connected in parallel and enters the waste heat recovery unit 3 and the waste heat recovery unit 4 to be mixed and then divided into two paths, one path flows in from the top interface of the low-temperature water storage tank 1, the other path flows in from the bottom interface of the high-temperature water storage tank 6, is pressed out from the top interface and enters the generator of the waste heat recovery unit 3, is cooled and then enters the heat exchange unit 5, and is heated by the high-temperature, flows into a primary network water supply pipeline 1-2 and is supplied out.
In a preferred embodiment, during the valley period of the electric load, when the cogeneration is operating in the pumping condition, the valve 11 is closed and the valve 12 is opened, and one path of the return water of the primary network enters the waste heat recovery unit 4 and then is mixed with the stored water which is pressed out from the top connector of the low-temperature water storage tank 1.
In a preferred embodiment, in the valley period of the electric load, when the cogeneration operates under the back pressure condition, the valve 11, the valve 12, the valve 14 and the circulating water pump 8 are closed, the primary network backwater is totally entered from the bottom connector of the low-temperature water storage tank 1 through the circulating water pump 9, the stored water in the low-temperature water storage tank 1 is pressed out from the top connector, and then enters the heat exchange unit 5, is heated to the design temperature of the heat network by the high-temperature steam of the cogeneration unit to obtain the primary network high-temperature water supply, and flows into the primary network water supply pipeline 1-2 to be supplied out.
In a preferred embodiment, during the peak period of the electric load, when the cogeneration operates in the condensing and pumping condition, the valve 11 is closed and the valve 12 is opened, and the primary network backwater enters the waste heat recovery unit 3 and the waste heat recovery unit 4 in parallel.
In a preferred embodiment, during the peak period of the electric load, when the cogeneration operates in the condensing and pumping condition, the valve 11 is closed, the valve 12 is opened, the valve 14 is closed, and the primary network backwater enters the waste heat recovery unit 3.
In a preferred embodiment, during the peak period of the electric load, when the cogeneration operates in the condensing and pumping condition, the valve 14 is closed, and the primary network backwater enters the heat exchange unit 2 and the waste heat recovery unit 3.
In a preferred embodiment, during the peak period of the electric load, when the cogeneration runs under the extraction condensing or pure condensing condition, the valve 16 is closed and the valve 17 is opened, the stored water in the high-temperature water storage tank 6 is pressed out from the top connector and enters the generator of the waste heat recovery unit 3, and after being cooled to the design temperature of the heat supply network, the primary network high-temperature water supply is obtained and flows into the primary network water supply pipeline 1-2 to be supplied out.
Example two:
as shown in fig. 2, the high-temperature heat storage type peak shaving power cogeneration waste heat recovery device provided by this embodiment mainly comprises a low-temperature water storage tank 1, a heat exchanger unit 2, a waste heat recovery unit 3, a waste heat recovery unit 4, a heat exchanger unit 5, a high-temperature water storage tank 6, a heat exchanger unit 7, circulating water pumps 8-10, and valves 11-24. Wherein, the primary net water return pipeline 1-1 is connected in parallel with the inlet of the circulating water pump 8, the inlet of the circulating water pump 9 and the valve 18, and the outlet of the circulating water pump 9 is connected in parallel with the valve 18 through the valve 19 and the bottom interface of the low-temperature water storage tank 1. The top interface of the low-temperature water storage tank 1 is divided into four paths which are respectively connected with the outlet of the waste heat recovery unit 4, the valve 15, the valve 20 and the valve 24 in parallel. The outlet of the circulating water pump 8 is connected with a valve 11 and a valve 12 in parallel, the valve 11 is connected with the inlet of the heat exchanger unit 2, the outlet of the heat exchanger unit 2 is connected with a valve 13 and a valve 14 in parallel with the valve 12, the valve 13 is connected with the inlet of the waste heat recovery unit 3, the outlet of the waste heat recovery unit 3 is connected with a valve 23 and a valve 24 in parallel with the valve 14, and the valve 23 is connected with the inlet of the waste heat recovery unit 4. The bottom interface of the high-temperature water storage tank 6 is connected with the valve 20 and the inlet of the circulating water pump 10 in parallel, and the outlet of the circulating water pump 10 is connected with the inlet of the heat exchanger unit 7 through the valve 21. The top interface of the high-temperature water storage tank 6 is connected with the outlet of the heat exchanger unit 7 and the valve 22 in parallel, the valve 22 is connected with the generator inlet of the waste heat recovery unit 3, the generator outlet of the waste heat recovery unit 3 is connected with the valve 15 in parallel and connected with the valve 16 and the valve 17, the valve 16 is connected with the inlet of the heat exchanger unit 5, and the outlet of the heat exchanger unit 5 is connected with the valve 17 in parallel and connected with the primary network water supply pipeline 1-2.
In a preferred embodiment, the heat exchange equipment in the heat exchange unit 2 adopts a condenser or a second-class absorption heat exchanger, and the heat exchange equipment can be connected in series or in parallel.
In a preferred embodiment, the heat exchange device in the waste heat recovery unit 4 adopts a steam-water heat exchanger, an absorption heat pump or a compression heat pump, and the heat exchange devices can be connected in series or in parallel.
In a preferred embodiment, the heat exchanger unit 7 is a steam-water heat exchanger or a second type absorption heat exchanger, and the heat exchange devices can be connected in series or in parallel.
Based on the high-temperature heat storage type peak shaving cogeneration waste heat recovery device provided in the above embodiment, the invention also provides a high-temperature heat storage type peak shaving cogeneration waste heat recovery method, which adjusts the operation mode of the waste heat recovery device through different valve switch combinations to respectively operate in the electricity load valley and the electricity load peak period:
1) electric load low ebb period: when the cogeneration unit operates under the pumping and condensing working condition, closing the valve 12, the valve 13, the valve 17, the valve 18, the valve 20, the valve 22 and the valve 24, opening the valve 11, the valves 14 to 16, the valve 19, the valve 21, the valve 23 and the circulating water pump 8 to 10, dividing primary network low-temperature backwater supplied out through the primary network backwater pipeline 1 to 1 into two paths, wherein one path enters from a bottom connector of the low-temperature water storage tank 1 through the circulating water pump 9, and the stored water in the low-temperature water storage tank 1 is pressed out from a top connector; the other path of the water enters the heat exchange unit 2, the waste heat recovery unit 3 and the waste heat recovery unit 4 in sequence through a circulating water pump 8; the primary network backwater flowing out of the waste heat recovery unit 4 and the top connector of the low-temperature water storage tank 1 is mixed and then enters the heat exchange unit 5, is heated to the design temperature of a heat network by high-temperature steam of the cogeneration unit to obtain primary network high-temperature water supply, and flows into the primary network water supply pipeline 1-2 to be supplied; meanwhile, the stored water in the high-temperature water storage tank 6 is pumped out from the bottom connector through the circulating water pump 10 and flows into the heat exchange unit 7, and is heated by the high-temperature steam of the cogeneration unit and then returns to the high-temperature water storage tank 6 from the top connector.
2) During peak hours of electric load: when the cogeneration unit operates under the pumping and condensing working condition, the valve 12, the valve 14, the valve 15, the valve 17, the valve 19, the valve 21, the valve 24, the circulating water pump 9 and the circulating water pump 10 are closed, the valve 11, the valve 13, the valve 16, the valve 18, the valve 20, the valve 22, the valve 23 and the circulating water pump 8 are opened, the stored water in the low-temperature water storage tank 1 flows out from a bottom connector, is mixed with the primary network low-temperature return water supplied by the primary network return water pipeline 1-1 and then sequentially enters the heat exchanger unit 2, the waste heat recovery unit 3 and the waste heat recovery unit 4 through the circulating water pump 8, and then is divided into two paths, wherein one path flows in from a top connector of the low-temperature water storage tank 1, and the other path flows in from; the stored water in the high-temperature water storage tank 6 is pressed out from the top connector and enters the generator of the waste heat recovery unit 3, the generator enters the heat exchange unit 5 after being cooled, the high-temperature steam of the cogeneration unit is heated to the design temperature of a heat supply network to obtain primary network high-temperature water supply, and the primary network high-temperature water supply flows into the primary network water supply pipeline 1-2 and is supplied out.
In a preferred embodiment, in the valley period of the electric load, when the cogeneration operates in the pumping and condensing condition, the valve 11 is closed and the valve 12 is opened, one path of the primary network backwater enters the waste heat recovery unit 4 and then is mixed with the stored water from the low-temperature water storage tank 1 and is pressed out from the top connector.
In a preferred embodiment, in the valley period of the electric load, when the cogeneration operates in the pumping and condensing condition, the valve 23 is closed and the valve 24 is opened, and one path of primary network backwater enters the heat exchange unit 2 and then is mixed with the stored water from the low-temperature water storage tank 1 and is pressed out from the top connector.
In a preferred embodiment, in the valley period of the electric load, when the cogeneration operates under the back pressure condition, the valve 11, the valve 12, the valve 13, the valve 14, the valve 23, the valve 24 and the circulating water pump 8 are closed, the primary network backwater is totally input from the bottom connector of the low-temperature water storage tank 1 through the circulating water pump 9, the stored water in the low-temperature water storage tank 1 is pressed out from the top connector, and then enters the heat exchange unit 5, is heated to the design temperature of the heat network by the high-temperature steam of the cogeneration unit to obtain primary network high-temperature water supply, and flows into the primary network water supply pipeline 1-2 to be supplied.
In a preferred embodiment, during the peak period of the electric load, when the cogeneration operates in the condensing condition, the valve 11 is closed and the valve 12 is opened, and the primary network backwater sequentially enters the waste heat recovery unit 3 and the waste heat recovery unit 4.
In a preferred embodiment, during the peak period of the electric load, when the cogeneration operates in the condensing and pumping condition, the valve 11 is closed and the valve 12 is opened, the valve 23 is closed and the valve 24 is opened, and the primary network backwater enters the waste heat recovery unit 3.
In a preferred embodiment, during the peak period of the electric load, when the cogeneration operates in the condensing and pumping condition, the valve 11 is opened and the valve 12 is closed, the valve 23 is closed and the valve 24 is opened, and the primary network backwater enters the heat exchange unit 2 and the waste heat recovery unit 3.
In a preferred embodiment, during the peak period of the electric load, when the cogeneration operates in the pure condensation condition, the valve 16 is closed and the valve 17 is opened, the stored water in the high-temperature water storage tank 6 is pressed out from the top connector and enters the generator of the waste heat recovery unit 3, and after being cooled to the design temperature of the heat supply network, the primary network high-temperature water supply is obtained and flows into the primary network water supply pipeline 1-2 to be supplied out.
The above embodiments are only used for illustrating the present invention, and the structure, connection mode, manufacturing process, etc. of the components may be changed, and all equivalent changes and modifications performed on the basis of the technical solution of the present invention should not be excluded from the protection scope of the present invention.

Claims (8)

1. A high-temperature heat storage type peak shaving cogeneration waste heat recovery device is characterized by mainly comprising a low-temperature water storage tank (1), a first heat exchange unit (2), a first waste heat recovery unit (3), a second waste heat recovery unit (4), a second heat exchange unit (5), a high-temperature water storage tank (6), a third heat exchange unit (7), first to third circulating water pumps (8-10) and first to twelfth valves (11-22); wherein, the primary network water return pipeline is connected with the inlet of the first circulating water pump (8), the inlet of the second circulating water pump (9) and the eighth valve (18) in parallel, and the outlet of the second circulating water pump (9) is connected with the bottom interface of the low-temperature water storage tank (1) in parallel through the ninth valve (19) and the eighth valve (18); the top interface of the low-temperature water storage tank (1) is divided into four paths which are respectively connected with the outlet of the first waste heat recovery unit (3), the outlet of the second waste heat recovery unit (4), the fifth valve (15) and the tenth valve (20) in parallel; an outlet of the first circulating water pump (8) is connected with a first valve (11) and a second valve (12) in parallel, the first valve (11) is connected with an inlet of the first heat exchanger unit (2), an outlet of the first heat exchanger unit (2) and the second valve (12) are connected with a third valve (13) and a fourth valve (14) in parallel, the third valve (13) is connected with an inlet of the first waste heat recovery unit (3), and the fourth valve (14) is connected with an inlet of the second waste heat recovery unit (4); the bottom interface of the high-temperature water storage tank (6) is connected with the tenth valve (20) and the inlet of the third circulating water pump (10) in parallel, and the outlet of the third circulating water pump (10) is connected with the inlet of the third heat exchanger unit (7) through the eleventh valve (21); the top interface of the high-temperature water storage tank (6) is connected with the outlet of the third heat exchanger unit (7) and a twelfth valve (22) in parallel, the twelfth valve (22) is connected with the generator inlet of the first waste heat recovery unit (3), the generator outlet of the first waste heat recovery unit (3) and a fifth valve (15) are connected with a sixth valve (16) and a seventh valve (17) in parallel, the sixth valve (16) is connected with the inlet of the second heat exchanger unit (5), and the outlet of the second heat exchanger unit (5) and the seventh valve (17) are connected with a primary network water supply pipeline in parallel.
2. A high-temperature heat storage type peak shaving cogeneration waste heat recovery device is characterized by mainly comprising a low-temperature water storage tank (1), a first heat exchange unit (2), a first waste heat recovery unit (3), a second waste heat recovery unit (4), a second heat exchange unit (5), a high-temperature water storage tank (6), a third heat exchange unit (7), first to third circulating water pumps (8-10) and first to fourteenth valves (11-24); wherein, the primary network water return pipeline is connected with the inlet of the first circulating water pump (8), the inlet of the second circulating water pump (9) and the eighth valve (18) in parallel, and the outlet of the second circulating water pump (9) is connected with the bottom interface of the low-temperature water storage tank (1) in parallel through the ninth valve (19) and the eighth valve (18); the top interface of the low-temperature water storage tank (1) is divided into four paths which are respectively connected with the outlet of the second waste heat recovery unit (4), the fifth valve (15), the tenth valve (20) and the fourteenth valve (24) in parallel; an outlet of the first circulating water pump (8) is connected with a first valve (11) and a second valve (12) in parallel, the first valve (11) is connected with an inlet of the first heat exchanger unit (2), an outlet of the first heat exchanger unit (2) and the second valve (12) are connected with a third valve (13) and a fourth valve (14) in parallel, the third valve (13) is connected with an inlet of the first waste heat recovery unit (3), an outlet of the first waste heat recovery unit (3) and the fourth valve (14) are connected with a thirteenth valve (23) and a fourteenth valve (24) in parallel, and the thirteenth valve (23) is connected with an inlet of the second waste heat recovery unit (4); the bottom interface of the high-temperature water storage tank (6) is connected with the tenth valve (20) and the inlet of the third circulating water pump (10) in parallel, and the outlet of the third circulating water pump (10) is connected with the inlet of the third heat exchanger unit (7) through the eleventh valve (21); the top interface of the high-temperature water storage tank (6) is connected with the outlet of the third heat exchanger unit (7) and a twelfth valve (22) in parallel, the twelfth valve (22) is connected with the generator inlet of the first waste heat recovery unit (3), the generator outlet of the first waste heat recovery unit (3) is connected with a fifth valve (15) in parallel and connected with a sixth valve (16) and a seventh valve (17), the sixth valve (16) is connected with the inlet of the second heat exchanger unit (5), and the outlet of the second heat exchanger unit (5) is connected with the seventh valve (17) in parallel and connected with a primary network water supply pipeline.
3. A high-temperature heat storage type peak shaving power cogeneration waste heat recovery device as claimed in claim 1 or 2, wherein the heat exchange equipment in the first heat exchange unit (2) adopts a condenser or a second type absorption heat exchanger, and the heat exchange equipment is connected in series or in parallel; the heat exchange equipment in the second waste heat recovery unit (4) adopts a steam-water heat exchanger, an absorption heat pump or a compression heat pump, and the heat exchange equipment is connected in series or in parallel; the third heat exchanger set (7) adopts a steam-water heat exchanger or a second-class absorption heat exchanger, and the heat exchange equipment is connected in series or in parallel.
4. A method for recovering waste heat from peak shaving cogeneration of electricity and heat by using the device of claim 1, wherein the method adjusts the operation mode of the device through different valve switch combinations to respectively operate in the periods of low load valley and high load peak:
1) electric load low ebb period: when the cogeneration unit operates under the pumping and condensing working condition, the second valve (12), the third valve (13), the seventh valve (17), the eighth valve (18), the tenth valve (20) and the twelfth valve (22) are closed, the first valve (11), the fourth to sixth valves (14-16), the ninth valve (19), the eleventh valve (21) and the first to third circulating water pumps (8-10) are opened, primary network low-temperature backwater supplied out through a primary network backwater pipeline is divided into two paths, one path enters from a bottom connector of the low-temperature water storage tank (1) through the second circulating water pump (9), and water stored in the low-temperature water storage tank (1) is pressed out from a top connector; the other path of the waste heat enters a first heat exchange unit (2) and a second waste heat recovery unit (4) in sequence through a first circulating water pump (8); primary network water flowing out of a top connector of the second waste heat recovery unit (4) and the low-temperature water storage tank (1) is mixed and then enters the second heat exchange unit (5), is heated to the design temperature of a heat network by high-temperature steam of the cogeneration unit to obtain primary network high-temperature water supply, and flows into a primary network water supply pipeline to be supplied out; meanwhile, the stored water in the high-temperature water storage tank (6) is pumped out from the bottom connector through a third circulating water pump (10) and flows into a third heat exchange unit (7), and is heated by high-temperature steam of the cogeneration unit and then returns to the high-temperature water storage tank (6) from the top connector;
2) during peak hours of electric load: when the cogeneration unit operates under the condensing condition, the second valve (12), the fifth valve (15), the seventh valve (17), the ninth valve (19), the eleventh valve (21), the second circulating water pump (9) and the third circulating water pump (10) are closed, the first valve (11), the third valve (13), the fourth valve (14), the sixth valve (16), the eighth valve (18), the tenth valve (20), the twelfth valve (22) and the first circulating water pump (8) are opened, the stored water in the low-temperature water storage tank (1) flows out from a bottom connector, is mixed with the primary network low-temperature return water supplied by the primary network return water pipeline, then enters the first heat exchange unit (2) through the first circulating water pump (8), then enters the first waste heat recovery unit (3) and the second waste heat recovery unit (4) in parallel, is mixed and then divided into two paths, and one path flows in from a top connector of the low-temperature water storage tank (1), the other way flows in from a bottom connector of the high-temperature water storage tank (6), the water storage in the high-temperature water storage tank (6) is pressed out from a top connector to enter a generator of the first waste heat recovery unit (3), and the generator enters the second heat exchange unit (5) after being cooled, is heated to the design temperature of a heat supply network by high-temperature steam of the cogeneration unit to obtain primary network high-temperature water supply, and flows into a primary network water supply pipeline to be supplied out.
5. A method for recovering waste heat from peak shaving cogeneration of electricity and heat by using the device of claim 2, wherein the method adjusts the operation mode of the device through different valve switch combinations to respectively operate in the periods of low load valley and high load peak:
1) electric load low ebb period: when the cogeneration unit operates under the pumping and condensing working condition, closing the valves, namely a second valve (12), a third valve (13), a seventh valve (17), an eighth valve (18), a tenth valve (20), a twelfth valve (22) and a fourteenth valve (24), opening a first valve (11), fourth to sixth valves (14-16), a ninth valve (19), an eleventh valve (21), a thirteenth valve (23) and first to third circulating water pumps (8-10), dividing primary network low-temperature return water supplied out through a primary network return water pipeline into two paths, allowing one path of primary network low-temperature return water to enter from a bottom connector of a low-temperature water storage tank (1) through a second circulating water pump (9), and pressing out water stored in the low-temperature water storage tank (1) from a top connector; the other path of the waste heat enters a first heat exchange unit (2) and a second waste heat recovery unit (4) in sequence through a first circulating water pump (8); primary network backwater flowing out of a top connector of the second waste heat recovery unit (4) and the low-temperature water storage tank (1) is mixed and then enters the second heat exchange unit (5), and is heated to the design temperature of a heat network by high-temperature steam of the cogeneration unit to obtain primary network high-temperature water supply, and the primary network high-temperature water supply flows into a primary network water supply pipeline to be supplied out; meanwhile, the stored water in the high-temperature water storage tank (6) is pumped out from the bottom connector through a third circulating water pump (10) and flows into a third heat exchange unit (7), and is heated by high-temperature steam of the cogeneration unit and then returns to the high-temperature water storage tank (6) from the top connector;
2) during peak hours of electric load: when the cogeneration unit operates under the condensing condition, the second valve (12), the fourth valve (14), the fifth valve (15), the seventh valve (17), the ninth valve (19), the eleventh valve (21), the fourteenth valve (24), the second circulating water pump (9) and the third circulating water pump (10) are closed, the first valve (11), the third valve (13), the sixth valve (16), the eighth valve (18), the tenth valve (20), the twelfth valve (22), the thirteenth valve (23) and the first circulating water pump (8) are opened, the stored water in the low-temperature water storage tank (1) flows out from a bottom connector, is mixed with the primary network low-temperature return water supplied by the primary network return water pipeline and then sequentially enters the first heat exchanger unit (2), the first waste heat recovery unit (3) and the second waste heat recovery unit (4) through the first circulating water pump (8) and then is divided into two paths, one path flows in from a top interface of the low-temperature water storage tank (1), and the other path flows in from a bottom interface of the high-temperature water storage tank (6); the water storage in the high-temperature water storage tank (6) is pressed out from the top connector to enter a generator of the first waste heat recovery unit (3), is cooled and then enters the second heat exchange unit (5), is heated to the design temperature of a heat supply network by high-temperature steam of the cogeneration unit to obtain primary network high-temperature water supply, and flows into a primary network water supply pipeline to be supplied out.
6. The peak shaving cogeneration waste heat recovery method of electric power according to claim 4 or 5, characterized in that, in the valley period of the electric load, when the cogeneration is operated under the condensing condition, the first valve (11) is closed and the second valve (12) is opened, one path of the primary network backwater enters the second waste heat recovery unit (4), and then is mixed with the stored water from the low-temperature water storage tank (1) pressed out from the top connector;
at the peak of the electric load, when the cogeneration runs under the condensing condition, the first valve (11) is closed and the second valve (12) is opened, and the primary net backwater sequentially enters the first waste heat recovery unit (3) and the second waste heat recovery unit (4);
at the peak of electric load, when the cogeneration runs under the pure condensation working condition, the sixth valve (16) is closed and the seventh valve (17) is opened, the stored water in the high-temperature water storage tank (6) is pressed out from the top connector and enters the generator of the first waste heat recovery unit (3), and primary network high-temperature water supply is obtained after the stored water is cooled to the design temperature of the heat supply network and flows into the primary network water supply pipeline to be supplied out.
7. The peak shaving cogeneration waste heat recovery method according to claim 4, wherein in the valley period of the electrical load, when the cogeneration operates under the back pressure condition, the first valve (11), the second valve (12), the fourth valve (14) and the first circulating water pump (8) are closed, the primary network backwater all enters from the bottom connector of the low-temperature water storage tank (1) through the first circulating water pump (9), the stored water in the low-temperature water storage tank (1) is pressed out from the top connector and then enters the second heat exchanger unit (5), and the primary network backwater is heated to the design temperature of the heat network by the high-temperature steam of the cogeneration unit to obtain the primary network high-temperature water supply which flows into the primary network water supply pipeline and is supplied out;
at the peak of the electric load, when the cogeneration runs under the condensing condition, the first valve (11) is closed, the second valve (12) is opened, the fourth valve (14) is closed, and the primary network backwater enters the first waste heat recovery unit (3);
or, in the peak period of the electric load, when the cogeneration runs under the condensing condition, the fourth valve (14) is closed, and the primary net backwater enters the first heat exchanger unit (2) and the first waste heat recovery unit (3).
8. The peak shaving cogeneration waste heat recovery method according to claim 5, wherein in the valley period of the electric load, when the cogeneration is operated under the extraction and condensation condition, the thirteenth valve (23) is closed and the fourteenth valve (24) is opened, one path of primary network backwater enters the first heat exchanger unit (2), and then is mixed with the stored water from the low-temperature water storage tank (1) pressed out from the top connector;
in the valley period of the electric load, when the cogeneration runs under the working condition of back pressure, closing a first valve (11), a second valve (12), a third valve (13), a fourth valve (14), a thirteenth valve (23), a fourteenth valve (24) and a first circulating water pump (8), enabling return water of a primary network to completely enter from a bottom connector of a low-temperature water storage tank (1) through a second circulating water pump (9), enabling stored water in the low-temperature water storage tank (1) to be extruded from a top connector, then enabling the return water to enter a second heat exchange unit (5), heating the return water to the design temperature of a heat network by high-temperature steam of the cogeneration unit to obtain high-temperature water supply of the primary network, and enabling the high-temperature water supply of the primary network to flow into a water supply pipeline of;
at the peak of the electric load, when the cogeneration runs under the condensing condition, the first valve (11) is closed and the second valve (12) is opened, the thirteenth valve (23) is closed and the fourteenth valve (24) is opened, and the primary net backwater enters the first waste heat recovery unit (3);
or, in the peak period of the electric load, when the cogeneration runs under the condensing condition, the first valve (11) is opened and the second valve (12) is closed, the thirteenth valve (23) is closed and the fourteenth valve (24) is opened, and the primary network backwater enters the first heat exchanger unit (2) and the first waste heat recovery unit (3).
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