CN107940538B - Graded heat storage system for cogeneration unit and peak shaving method thereof - Google Patents
Graded heat storage system for cogeneration unit and peak shaving method thereof Download PDFInfo
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- CN107940538B CN107940538B CN201711321123.5A CN201711321123A CN107940538B CN 107940538 B CN107940538 B CN 107940538B CN 201711321123 A CN201711321123 A CN 201711321123A CN 107940538 B CN107940538 B CN 107940538B
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- 238000005338 heat storage Methods 0.000 title claims abstract description 162
- 238000000034 method Methods 0.000 title claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 168
- 230000020169 heat generation Effects 0.000 claims abstract description 13
- 230000001105 regulatory effect Effects 0.000 claims abstract description 4
- 230000033228 biological regulation Effects 0.000 description 15
- 238000010248 power generation Methods 0.000 description 6
- 230000005611 electricity Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
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- 230000005484 gravity Effects 0.000 description 1
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- 239000012782 phase change material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000005619 thermoelectricity Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D11/00—Central heating systems using heat accumulated in storage masses
- F24D11/002—Central heating systems using heat accumulated in storage masses water heating system
- F24D11/005—Central heating systems using heat accumulated in storage masses water heating system with recuperation of waste heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
- F01K17/025—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic in combination with at least one gas turbine, e.g. a combustion gas turbine
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/14—Combined heat and power generation [CHP]
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses a grading heat storage system for a cogeneration unit and a peak shaving method thereof. The system comprises a power plant system and a heat storage system, wherein the power plant system comprises a boiler, a turbine high-pressure cylinder, a turbine medium-pressure cylinder, a turbine low-pressure cylinder, a generator, a condenser, a condensate pump, a low-pressure heater, a deaerator, a water supply pump and a high-pressure heater; the heat storage system comprises a first heat supply network heat exchanger, a second heat supply network heat exchanger, a first control valve, a first heat storage water tank, a second heat storage water tank, a steam expansion container, a heat supply network user and a heat supply network circulating water pump. When the power grid load demand is large and the heat generation amount is sufficient, the first heat storage water tank and the second heat storage water tank store heat; when the peak of the power grid is regulated, the electric load is reduced, and the heat generation quantity is reduced, the first heat storage water tank and the second heat storage water tank emit heat, so that the heat supply quality is unchanged. The invention utilizes a grading heat storage mode, is more suitable for deep peak shaving of the cogeneration unit, can better ensure heat supply quality and improves heat energy utilization rate.
Description
Technical Field
The invention relates to the technical field of thermoelectricity, in particular to a grading heat storage system for a cogeneration unit and a peak shaving method thereof.
Background
With the rapid development of the economy in China and the increasing of the living standard of people, the installed capacity of the domestic power grid is enlarged. However, as the electricity utilization structure in recent years changes in China, namely the electricity consumption of the first industry is reduced, and the electricity consumption of the second industry and the third industry is increased, the peak-valley difference of the power grid is gradually increased; meanwhile, new energy power generation technologies such as wind energy and solar energy, which are greatly developed in recent years, have the problem of energy supply and demand dislocation, and in order to match with the internet of renewable energy power generation, power plant units which originally do not need to participate in peak regulation are also required to bear certain peak regulation tasks, and the peak regulation amplitude and difficulty of a power grid are certainly increased.
In addition, most of power plants in China are thermal power plants mainly using coal, the specific gravity of the hydropower plants is small, the characteristic of northeast areas is particularly remarkable, and along with the deep development of energy conservation and emission reduction work in China, many coal-fired power plants in the northeast areas are transformed into cogeneration power plants capable of heating in winter, so that the utilization efficiency of energy sources and the benefits of the power plants are improved to a certain extent, but the technical defects are also caused. At present, a power plant for cogeneration mostly adopts a heat and electricity fixed-temperature running mode, and after the heat supply load of the power plant is determined, the power generation load of the power plant is also fixed, so that the flexibility of the power generation capacity of the power plant is greatly restricted.
In summary, the cogeneration plant is no longer suitable for operation with heat and power. According to the related instruction about the improvement of the peak regulation capacity of the cogeneration power plant in the cogeneration management method issued by the national issuing and modifying commission, the energy bureau and the like in the month 3 of 2016, the cogeneration power plant is a necessary trend to install a heat storage device to improve the peak regulation capacity of the cogeneration power plant on the premise of ensuring the safety of the system.
By searching, chinese patent (CN 106123086A) discloses a cogeneration unit with a heat storage device and a peak regulation method thereof, wherein the cogeneration unit designed by the invention in the patent comprises a steam turbine, a heat supply network heater, the heat storage device and a heat supply network circulating water pump, the heat storage device adopts a phase-change material inclined temperature layer heat storage tank and an adjusting system thereof, and after the heat storage device is placed in the heat supply network heater, part of water discharged by the heat supply network heater is used as a heat storage heat source. The peak regulation method is to change the working state of the heat storage device by opening and closing the valve: when the heat generated by the unit is large, the heat is supplied by the heat supply network heater, and the heat storage device stores heat; when the heat generation amount is small, the heat storage device releases heat to replace part of steam extraction of the heat supply network heater to heat the heat supply network backwater, and the heat supply network backwater is mixed with the water discharged by the heat supply network heater and then sent to a heating power station. The peak regulation capacity of the cogeneration unit is improved to a certain extent, but the heat energy is not utilized in a gradient way, so that the heat energy utilization rate is not high; in addition, the patent does not consider the situation that when the heat generated by the unit is reduced, the heat extracted by the steam turbine and the heat released by the heat storage device can not meet the requirements of users of the heat supply network, and therefore the heat supply quality can not be ensured to be unchanged all the time when the unit participates in the peak regulation and heat generation of the power grid.
Disclosure of Invention
The invention overcomes the defects of the prior art, provides a grading heat storage system for a cogeneration unit and a peak regulation method thereof based on heat supply of multiple heat sources, and the grading heat storage system increases the heat supply capacity of the cogeneration unit, is suitable for the cogeneration unit participating in peak regulation of a power grid, and is beneficial to the absorption of renewable energy sources such as wind power generation, solar power generation and the like.
The technical scheme adopted for solving the problems in the prior art is as follows:
a grading heat storage system for a cogeneration unit comprises a power plant system and a heat storage system;
the heat storage system comprises a first heat supply network heat exchanger, a second heat supply network heat exchanger, a first heat storage water tank, a second heat storage water tank, a heat supply network user and a heat supply network circulating water pump; the first outlet of the first heat storage network heat exchanger is connected with the first inlet of the first heat storage water tank, the first outlet of the first heat storage water tank is connected with the first inlet of the second heat storage network heat exchanger, the first outlet of the second heat storage water tank is connected with the first inlet of the second heat storage water tank, the first outlet of the second heat storage water tank is connected with the second inlet of the second heat storage water tank through a heat storage network circulating water pump, the second outlet of the second heat storage water tank is connected with the second inlet of the first heat storage water tank, and the second outlet of the first heat storage water tank is connected with the first inlet of the first heat storage network heat exchanger to form a heat storage circulating system; the first inlet and the first outlet of the first heat storage water tank, the second inlet and the second outlet of the first heat storage water tank, the first inlet and the first outlet of the second heat storage water tank and the second inlet and the second outlet of the second heat storage water tank are respectively connected through a bypass pipe, and the bypass pipe is controlled to be opened and closed through a control valve;
the main steam pipeline of the power plant system is connected with the second heat supply network heat exchanger for heat exchange; and a steam turbine medium-pressure cylinder steam exhaust pipe of the power plant system is connected with the first heat storage water tank for heat exchange.
The power plant system comprises a boiler and a steam turbine high-pressure cylinder; the first steam outlet of the boiler is connected with the inlet of the high-pressure cylinder of the steam turbine, the outlet of the high-pressure cylinder of the steam turbine is connected with the second steam inlet of the boiler, and the second steam outlet of the boiler is sequentially connected with the medium-pressure cylinder of the steam turbine, the low-pressure cylinder of the steam turbine, the condenser, the condensate pump, the low-pressure heater, the deaerator, the water supply pump, the high-pressure heater and the first steam inlet of the boiler through pipelines to form a power plant circulating system.
The main steam pipeline of the power plant system is connected with the second heat supply network heat exchanger through the steam expansion vessel for heat exchange; the inlet of the steam expansion vessel is connected with a first steam outlet of the boiler, and the outlet of the steam expansion vessel is connected with a second inlet of the second heat supply network heat exchanger; the second outlet of the second heat supply network heat exchanger is connected with the other inlet of the deaerator.
The second inlet of the first heat supply network heat exchanger is connected with the outlet of the medium pressure cylinder of the steam turbine, and the second outlet of the first heat supply network heat exchanger is connected with the other inlet of the condenser.
The first inlet pipe and the first outlet pipe of the first heat storage water tank, the second inlet pipe and the second outlet pipe of the first heat storage water tank, the first inlet pipe and the first outlet pipe of the second heat storage water tank, the second inlet pipe and the second outlet pipe of the second heat storage water tank and all bypass pipes are provided with control valves.
And a first control valve is arranged on a connecting pipeline of the main steam pipeline and the second heat supply network heat exchanger of the power plant system.
And a second control valve is arranged on a connecting pipeline of the steam turbine medium-pressure cylinder steam discharge pipe and the second heat storage water tank.
The first heat storage water tank is a cylindrical tank body with the height of 54.5m and the diameter of 6m, and the working pressure is 0.101325Mpa.
The second heat storage water tank is a cylindrical tank body with the height of 40m and the diameter of m, and the working pressure is 0.2-0.25 MPa.
A peak shaving method for a staged thermal storage system of a cogeneration unit, comprising the steps of:
A. when the power grid load demand is large and the heat generation amount is sufficient, the first heat storage water tank and the second heat storage water tank in the heat storage system store heat: a part of the first outlet hot water of the first heat supply network heat exchanger flows into the first heat storage water tank to be stored, cold water in the first heat storage water tank is discharged, and the other part of the hot water flows into the second heat supply network heat exchanger to continuously exchange heat; a part of hot water at the first outlet of the second heat supply network heat exchanger flows into the second heat storage water tank to be stored, cold water in the second heat storage water tank is discharged, and the other part of hot water flows into the heat supply network to provide heat; cold water at the outlet of the heat supply network user flows back to the first heat supply network heat exchanger under the drive of the heat supply network circulating water pump;
B. when the peak of the power grid is regulated and the heat generation amount of the electric load is reduced, the first heat storage water tank and the second heat storage water tank in the heat storage system release heat: the hot water at the first outlet of the first heat supply network heat exchanger flows into the second heat supply network heat exchanger together with the hot water at the first outlet of the first heat storage water tank for continuous heat exchange; the hot water at the first outlet of the second heat supply network heat exchanger and the hot water at the first outlet of the second heat storage water tank flow into a heat supply network user together to supply heat; the cold water at the outlet of the heat supply network user is divided into three parts under the drive of the heat supply network circulating water pump, wherein the first part flows into the second heat storage water tank, the second part flows into the first heat storage water tank, and the third part flows back into the first heat supply network heat exchanger.
Compared with the prior art, the invention has the beneficial effects that:
the hierarchical heat storage system comprises a power plant system and a heat storage system, wherein a first heat supply network heat exchanger, a second heat supply network heat exchanger, a first heat storage water tank, a second heat storage water tank, a heat supply network user and a heat supply network circulating water pump form the heat storage system, and steam at the inlet of a steam expansion vessel in the heat storage system is main steam which does not enter a high-pressure cylinder of a steam turbine yet; inlet steam above the first heat supply network heat exchanger is steam discharged by a middle pressure cylinder of the steam turbine; the method is characterized in that a mode of grading and storing heat by two heat storage water tanks at high temperature and low temperature is adopted, and when the electric load is large and the heat generation amount is also large, the high temperature and low temperature heat storage water tanks respectively store hot water which is heated by the exhaust steam of a middle pressure cylinder of a steam turbine and the main steam of the steam turbine; when the unit participates in power grid peak regulation and the electric load is reduced and the heat generation quantity is reduced, the high-temperature heat storage water tank and the low-temperature heat storage water tank release stored hot water to replace part of steam turbine air extraction, and because the high-temperature heat storage water tank is high in working pressure and high in water storage temperature, more heat can be provided for a heat supply network user, and the heat supply quality of the unit is better ensured not to change when the unit participates in power grid peak regulation. The system solves the problems that the heat energy utilization rate is low and the heat supply quality cannot be guaranteed to be unchanged all the time in the prior art, is more suitable for deep peak regulation of the cogeneration unit based on multi-heat source heat supply, can better guarantee the heat supply quality and improves the heat energy utilization rate.
The peak shaving method of the invention is to change the working state of the heat storage device by opening and closing the valve, and when the power grid load demand is large and the heat generation quantity is sufficient, the first heat storage water tank and the second heat storage water tank store heat; when the peak of the power grid is regulated, the electric load is reduced, and the heat generation quantity is reduced, the first heat storage water tank and the second heat storage water tank emit heat, so that the heat supply quality is unchanged. The method of graded heat accumulation is more suitable for deep peak shaving of the cogeneration unit, can better ensure heat supply quality and improve heat energy utilization rate.
Drawings
Fig. 1 is a diagram of a staged thermal storage system for a cogeneration unit.
Detailed Description
The invention will now be described in further detail by way of specific examples, which are given by way of illustration only and not by way of limitation, with reference to the accompanying drawings.
As shown in fig. 1, a staged heat storage system for a cogeneration unit of the present invention includes a power plant system 31 and a heat storage system 32. The power plant system 31 comprises a boiler 30, a turbine high-pressure cylinder 1, a turbine medium-pressure cylinder 2, a turbine low-pressure cylinder 3, a generator 7, a condenser 24, a condensate pump 25, a low-pressure heater 26, a deaerator 27, a water supply pump 28 and a high-pressure heater 29; the heat storage system 32 includes a first heat-grid heat exchanger 23, a second heat-grid heat exchanger 11, a plurality of control valves (control valve 4, control valve 6, control valve 8, control valve 9, control valve 10, control valve 12, control valve 13, control valve 14, control valve 17, control valve 18, control valve 19, control valve 20, control valve 21, and control valve 22), a first heat-storage water tank 33, a second heat-storage water tank 34, a vapor expansion tank 5, a heat-grid user 15, and a heat-grid circulating water pump 16.
The upper left steam outlet of the boiler 30 is connected with the inlet of the high pressure cylinder 1 of the steam turbine, the upper left steam outlet of the boiler 30 is connected with the inlet of the steam expansion tank 5 through the control valve 4, the outlet of the high pressure cylinder 1 of the steam turbine is connected with the inlet of the lower right steam inlet of the boiler 30, the upper right steam outlet of the boiler 30 is connected with the inlet of the middle pressure cylinder 2 of the steam turbine, the outlet of the middle pressure cylinder 2 of the steam turbine is connected with the inlet of the low pressure cylinder 3 of the steam turbine or the upper inlet of the first heat supply network heat exchanger 23 through the control valve 6, the outlet of the low pressure cylinder 3 of the steam turbine is connected with the upper inlet of the condenser 24, the outlet of the condenser 24 is connected with the inlet of the condensate pump 25, the outlet of the condensate pump 25 is connected with the inlet of the low pressure heater 26, the outlet of the low pressure heater 26 is connected with the upper right inlet of the deaerator 27, the outlet of the deaerator 27 is connected with the inlet of the water supply pump 28, the outlet of the water supply pump 28 is connected with the inlet of the high pressure heater 29, and the outlet of the high pressure heater 29 is connected with the lower left steam inlet of the boiler 30.
The outlet of the steam expansion tank 5 is connected with the inlet at the upper part of the second heat supply network heat exchanger 11, and the outlet at the lower part of the second heat supply network heat exchanger 11 is connected with the inlet at the upper left part of the deaerator 27; the lower outlet of the first heat supply network heat exchanger 23 is connected with the right inlet of the condenser 24; the upper right outlet of the first heat network heat exchanger 23 is connected with the upper left inlet of the first heat storage water tank 33 and the upper left Fang Rukou of the second heat network heat exchanger 11 through the control valve 8 and the control valve 9, the upper right outlet of the first heat storage water tank 33 is connected with the lower right inlet of the first heat storage water tank 33 through the control valve 10, the upper right outlet of the second heat network heat exchanger 11 is connected with the upper left inlet of the second heat storage water tank 34 and the 15 user inlet of the heat network through the control valve 12 and the control valve 13, the upper right outlet of the second heat storage water tank 34 is connected with the 15 user inlet of the heat network through the control valve 14, the outlet of the heat network user 15 is connected with the inlet of the heat network circulating water pump 16, the outlet of the heat network circulating water pump 16 is connected with the lower right inlet of the second heat storage water tank 34 through the control valve 17 or the control valve 18 and the control valve 20 is connected with the lower right inlet of the first heat storage water tank 33 through the control valve 18 and the control valve 21, the lower right outlet of the second heat storage water tank 34 is connected with the lower right inlet of the first heat storage water tank 33 through the control valve 19 and the control valve 21 and the lower right inlet of the first heat storage water tank 23 through the control valve 19 and the control valve 21, and the lower right inlet of the second heat storage water tank 34 is connected with the lower right inlet of the first heat storage water tank 23 through the control valve 23 and the lower right inlet of the control valve 23.
The inlet steam of the steam expansion vessel 5 in the heat storage system 32 is the main steam which does not enter the high-pressure cylinder 1 of the steam turbine yet; inlet steam above the first heat supply network heat exchanger 23 is exhausted by the middle pressure cylinder 2 of the steam turbine; the first heat storage water tank 33 is a cylindrical tank body with the height of 54.5m and the diameter of 6m, and the working pressure is 0.101325MPa; the second heat storage water tank 34 is a cylindrical tank body with the height of 40m and the diameter of 7m, and the working pressure is 0.2MPa to 0.25MPa.
The invention discloses a peak shaving method for a grading heat storage system of a cogeneration unit, which comprises the following steps of:
A. when the grid load demand is large and the amount of generated heat is sufficient, the first heat storage water tank 33 and the second heat storage water tank 34 in the heat storage system 32 are required to store heat. At this time, the control valves 4, 6, 8, 9, 12, 13, 18, 19, 21, and 22 are opened, and the control valves 10, 14, 17, and 20 are closed; a part of hot water at the upper right outlet of the first heat supply network heat exchanger 23 flows into the first heat storage water tank 33 through the control valve 8 to be stored, cold water in the first heat storage water tank 33 is discharged through the control valve 22, and the other part flows into the second heat supply network heat exchanger 11 through the control valve 9 to continuously exchange heat; a part of hot water at the right outlet of the second heat supply network heat exchanger 11 flows into the second heat storage water tank 34 through the control valve 12 to be stored, cold water in the second heat storage water tank 34 is discharged through the control valve 19, and the other part flows into the heat supply network user 15 through the control valve 13 to supply heat; the cold water at the outlet of the heat supply network user 15 flows back to the first heat supply network heat exchanger 23 through the control valve 18 and the control valve 21 under the drive of the heat supply network circulating water pump 16.
B. When the electric network peak shaving occurs and the electric load decreases to reduce the heat generation amount, the first heat storage water tank 33 and the second heat storage water tank 34 in the heat storage system 32 are required to release heat. At this time, the control valves 4, 6, 9, 10, 13, 14, 17, 18, 20, and 21 are opened, and the control valves 8, 12, 19, and 22 are closed; the hot water at the upper right outlet of the first heat supply network heat exchanger 23 flows into the second heat supply network heat exchanger 11 together with the hot water at the upper right outlet of the first heat storage water tank 33 for continuous heat exchange; the hot water at the right outlet of the second heat supply network heat exchanger 11 flows into the heat supply network user 15 together with the hot water at the right upper outlet of the second heat storage water tank 34 to supply heat; the cold water from the outlet of the heat supply network user 15 is divided into three parts by the drive of the heat supply network circulating water pump 16, wherein the first part flows into the second heat storage water tank 34 through the control valve 17, the second part flows into the first heat storage water tank 33 through the control valve 18 and the control valve 19, and the third part flows back into the first heat supply network heat exchanger 23 through the control valve 18 and the control valve 21.
The invention solves the problems that the heat energy utilization rate is low and the heat supply quality can not be ensured to be unchanged all the time in the prior art, and provides a grading heat storage system for a cogeneration unit and a peak regulation method thereof based on multi-heat source heat supply. The system is more suitable for deep peak shaving of the cogeneration unit, can better ensure the heat supply quality and improve the heat energy utilization rate.
The above description is not limited to the preferred embodiments of the present invention, but is intended to cover various modifications and equivalent arrangements included within the scope of the present invention.
Claims (6)
1. A staged heat storage system for a cogeneration unit, comprising a power plant system (31) and a heat storage system (32);
the heat storage system (32) comprises a first heat supply network heat exchanger (23), a second heat supply network heat exchanger (11), a first heat storage water tank (33), a second heat storage water tank (34), a heat supply network user (15) and a heat supply network circulating water pump (16); the first outlet of the first heat network heat exchanger (23) is connected with the first inlet of the first heat storage water tank (33), the first outlet of the first heat storage water tank (33) is connected with the first inlet of the second heat network heat exchanger (11), the first outlet of the second heat network heat exchanger (11) is connected with the first inlet of the second heat storage water tank (34), the first outlet of the second heat storage water tank (34) is connected with the inlet of the heat network user (15), the outlet of the heat network user (15) is connected with the second inlet of the second heat storage water tank (34) through the heat network circulating water pump (16), the second outlet of the second heat storage water tank (34) is connected with the second inlet of the first heat storage water tank (33), and the second outlet of the first heat storage water tank (33) is connected with the first inlet of the first heat network heat exchanger (23) to form a heat storage circulating system; the first inlet and the first outlet of the first heat storage water tank (33), the second inlet and the second outlet of the first heat storage water tank (33), the first inlet and the first outlet of the second heat storage water tank (34) and the second inlet and the second outlet of the second heat storage water tank (34) are respectively connected through a bypass pipe, and the bypass pipe is controlled to be opened and closed through a control valve;
the main steam pipeline of the power plant system (31) is connected with the second heat supply network heat exchanger (11) for heat exchange; the exhaust pipe of a steam turbine medium pressure cylinder (2) of the power plant system (31) is connected with the first heat supply network heat exchanger (23) for heat exchange;
the power plant system (31) comprises a boiler (30) and a steam turbine high-pressure cylinder (1); the first steam outlet of the boiler (30) is connected with the inlet of the high-pressure cylinder (1) of the steam turbine, the outlet of the high-pressure cylinder (1) of the steam turbine is connected with the second steam inlet of the boiler (30), and the second steam outlet of the boiler (30) is sequentially connected with the medium-pressure cylinder (2) of the steam turbine, the low-pressure cylinder (3) of the steam turbine, the condenser (24), the condensate pump (25), the low-pressure heater (26), the deaerator (27), the feed pump (28), the high-pressure heater (29) and the first steam inlet of the boiler (30) through pipelines to form a power plant circulation system;
the main steam pipeline of the power plant system (31) is connected with the second heat supply network heat exchanger (11) through the steam expansion vessel (5) for heat exchange; the inlet of the steam expansion vessel (5) is connected with a first steam outlet of the boiler (30), and the outlet of the steam expansion vessel (5) is connected with a second inlet of the second heat supply network heat exchanger (11); the second outlet of the second heat supply network heat exchanger (11) is connected with the other inlet of the deaerator (27);
the second inlet of the first heat supply network heat exchanger (23) is connected with the outlet of the middle pressure cylinder (2) of the steam turbine, and the second outlet of the first heat supply network heat exchanger (23) is connected with the other inlet of the condenser (24).
2. A staged heat storage system for a cogeneration unit according to claim 1, wherein the first heat storage water tank (33) is a cylindrical tank body with a height of 54.5m and a diameter of 6m, and the working pressure is 0.101325Mpa.
3. The grading heat storage system for the cogeneration unit according to claim 1, wherein the second heat storage water tank (34) is a cylindrical tank body with the height of 40m and the diameter (7) m, and the working pressure is 0.2-0.25 MPa.
4. A staged heat storage system for a cogeneration unit according to claim 1, wherein the primary steam pipe of the power plant system (31) is provided with a first control valve (4) in the connection with the second heat exchanger (11).
5. The grading heat storage system for the cogeneration unit according to claim 1, wherein a second control valve (6) is arranged on a connecting pipeline of a steam discharge pipe of the middle pressure cylinder (2) of the steam turbine and the first heat supply network heat exchanger (23).
6. The peak shaving method for a hierarchical heat storage system of a cogeneration unit according to claim 1, comprising the steps of:
A. when the power grid load demand is large and the heat generation amount is sufficient, a first heat storage water tank (33) and a second heat storage water tank (34) in the heat storage system (32) store heat: a part of the first outlet hot water of the first heat supply network heat exchanger (23) flows into the first heat storage water tank (33) to be stored, cold water in the first heat storage water tank (33) is discharged, and the other part of the hot water flows into the second heat supply network heat exchanger (11) to continuously exchange heat; a part of the first outlet hot water of the second heat supply network heat exchanger (11) flows into the second heat storage water tank (34) to be stored, cold water in the second heat storage water tank (34) is discharged, and the other part of the hot water flows into the heat supply network user (15) to supply heat; cold water at the outlet of the heat supply network user (15) flows back to the first heat supply network heat exchanger (23) under the drive of the heat supply network circulating water pump (16);
B. when the peak of the power grid is regulated, and the heat generation amount of the electric load is reduced, the first heat storage water tank (33) and the second heat storage water tank (34) in the heat storage system (32) release heat: the first outlet hot water of the first heat supply network heat exchanger (23) and the first outlet hot water of the first heat storage water tank (33) flow into the second heat supply network heat exchanger (11) together for continuous heat exchange; the first outlet hot water of the second heat supply network heat exchanger (11) and the first outlet hot water of the second heat storage water tank (34) flow into a heat supply network user (15) together to provide heat; the cold water at the outlet of the heat supply network user (15) is divided into three parts under the drive of the heat supply network circulating water pump (16), the first part flows into the second heat storage water tank (34), the second part flows into the first heat storage water tank (33), and the third part flows back into the first heat supply network heat exchanger (23).
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| CN112302747B (en) * | 2020-09-27 | 2023-03-14 | 国家电投集团科学技术研究院有限公司 | Cogeneration system and working method thereof |
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