CN113983445A - Thermal power plant energy storage and heat supply system and method for energy gradient utilization - Google Patents
Thermal power plant energy storage and heat supply system and method for energy gradient utilization Download PDFInfo
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- CN113983445A CN113983445A CN202111267192.9A CN202111267192A CN113983445A CN 113983445 A CN113983445 A CN 113983445A CN 202111267192 A CN202111267192 A CN 202111267192A CN 113983445 A CN113983445 A CN 113983445A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 82
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000000605 extraction Methods 0.000 claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 11
- 238000005338 heat storage Methods 0.000 claims description 5
- 238000010248 power generation Methods 0.000 description 5
- 230000002427 irreversible effect Effects 0.000 description 4
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B33/00—Steam-generation plants, e.g. comprising steam boilers of different types in mutual association
- F22B33/18—Combinations of steam boilers with other apparatus
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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
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
- F01K7/345—Control or safety-means particular thereto
-
- 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
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
- F01K7/38—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating the engines being of turbine type
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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
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
- F01K7/40—Use of two or more feed-water heaters in series
-
- 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
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
- F01K7/44—Use of steam for feed-water heating and another purpose
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D11/00—Feed-water supply not provided for in other main groups
- F22D11/02—Arrangements of feed-water pumps
- F22D11/06—Arrangements of feed-water pumps for returning condensate to boiler
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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
Abstract
The invention discloses a thermal power plant energy storage and heat supply system and method with energy gradient utilization, comprising a boiler, a steam turbine and an energy storage device; the steam outlet of the boiler is communicated with the inlet of the steam turbine, the high-parameter steam extraction port of the steam turbine is communicated with the inlet of the energy storage device through the first valve, and the low-parameter steam extraction port of the steam turbine is communicated with the inlet of the energy storage device through the second valve.
Description
Technical Field
The invention belongs to the field of power station boilers and steam turbine systems, and particularly relates to a thermal power plant energy storage and heat supply system and method with energy gradient utilization.
Background
In recent years, the new energy power generation technology is rapidly developed, the installed capacity of the new energy power generation is continuously increased, and the new energy power generation and the traditional coal-fired power generation are in great contradiction when operating simultaneously. Under the large environment of reducing the abandoned wind rate and the abandoned light rate and consuming the new energy generated energy, the coal-fired generator set urgently needs to improve the operation flexibility to adapt to the rule of the new energy power generation, but the cogeneration of the coal-fired generator set is one of the main forms of central heating at present, the heat efficiency of the unit is improved, the latent heat of vaporization of steam is recovered, the energy consumption level of the unit is greatly reduced, in the heat supply period in winter, the cogeneration unit cannot correspondingly adjust the generated energy along with the change of the new energy generated energy while ensuring the heat supply quantity due to the thermoelectric characteristic limitation, and the requirement of safe and stable operation of a power grid cannot be met.
The cogeneration unit adopts an energy storage heating system, which is a technology capable of effectively solving the problems, the surplus heat of heat supply extraction steam is stored in the energy storage device during high-power load, when the power grid reduces the power load of the cogeneration unit, the insufficient heat supply is supplemented by the heat released by the energy storage device, and the cogeneration unit meets the power grid power load dispatching requirement while meeting the heat supply. The cogeneration unit with the energy storage and heat supply system draws one path of steam source to the energy storage device from heat supply extraction steam, the heat supply extraction steam drains back to the turbine heat recovery system after releasing heat in the energy storage device, the heat supply extraction steam is in the heat release process of the energy storage device, the heat exchange end difference is large when the energy storage device is at low temperature in the initial stage, and the irreversible loss is large.
Design low parameter steam to energy memory's heating system, can utilize low parameter steam heating when making energy memory low temperature, reuse heat supply extraction steam heating to rated energy storage temperature after the temperature risees, so realize the temperature to the mouth, the energy storage heating system of step utilization reduces energy storage system irreversible loss, makes energy storage system heat transfer process rationalize more.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an energy storage and heat supply system and method of a thermal power plant with energy gradient utilization, which can effectively reduce the irreversible loss of stored energy.
In order to achieve the purpose, the thermal power plant energy storage and heat supply system with energy gradient utilization comprises a boiler, a steam turbine and an energy storage device;
the steam outlet of the boiler is communicated with the inlet of a steam turbine, the high-parameter steam extraction port of the steam turbine is communicated with the inlet of the energy storage device through a first valve, and the low-parameter steam extraction port of the steam turbine is communicated with the inlet of the energy storage device through a second valve.
The steam turbine exhaust steam recovery system is characterized by further comprising a condenser, a low-pressure heater, a deaerator and a high-pressure heater, an outlet of the energy storage device is communicated with an inlet of the condenser, an exhaust steam outlet of the steam turbine is communicated with an inlet of the condenser, an outlet of the condenser is communicated with an inlet of the high-pressure heater through the low-pressure heater and the deaerator, and an outlet of the high-pressure heater is communicated with an inlet of the boiler.
The energy storage device is connected with an external heat supply network.
The outlet of the condenser is communicated with the low-pressure heater through a condensate pump.
The deaerator is communicated with the inlet of the high-pressure heater through a water feed pump.
The invention relates to a thermal power plant energy storage and heat supply system with energy gradient utilization, which comprises the following steps:
the method comprises the steps of firstly opening a second valve, closing a first valve, inputting low-parameter steam extraction output by a steam turbine into an energy storage device, gradually opening the first valve after the temperature of an energy storage medium in the energy storage device rises to a preset temperature, gradually closing the second valve, inputting high-parameter steam extraction output by the steam turbine into the energy storage device at the same time until the opening degree of the first valve is adjusted to be maximum, and closing the second valve, and only inputting the high-parameter steam extraction output by the steam turbine into the energy storage device at the moment.
Superheated steam output by the boiler enters a steam turbine to do work, exhaust steam discharged by the steam turbine enters a condenser to be condensed into condensed water, and the condensed water sequentially enters the boiler through a low-pressure heater, a deaerator and a high-pressure heater.
High-parameter steam extraction and low-parameter steam extraction output by the steam turbine are subjected to heat release and condensation in the energy storage device to form condensed water, heat is stored in a heat storage medium in the energy storage device and then enters the condenser, and energy storage is achieved through the energy storage device.
The invention has the following beneficial effects:
when the thermal power plant energy storage and heat supply system and the method for energy gradient utilization are specifically operated, in the initial stage, low-parameter steam extraction of a steam turbine is firstly input into an energy storage device, after the temperature of an energy storage medium in the energy storage device is raised to a preset temperature, high-parameter steam extraction of the steam turbine is gradually input into the energy storage device, and meanwhile, the flow of the low-parameter steam extraction is gradually reduced, so that the low-parameter steam is used for heating in the initial temperature rise stage of the energy storage device, the high-parameter steam extraction is used for heating in the middle and later temperature rise stages, the heat exchange end difference in the initial temperature rise stage is reduced, the irreversible loss is reduced, and the limitation that the heat supply amount and the power supply amount are ensured during the heat supply period in winter to reduce the thermoelectric load characteristics of the steam turbine can be realized.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Wherein, 1 is a boiler, 2 is a steam turbine, 3 is an energy storage device, 4 is a condenser, 5 is a condensate pump, 6 is a low-pressure heater, 7 is a deaerator, 8 is a feed pump, 9 is a high-pressure heater, 10 is a high-parameter steam extraction opening, and 11 is a low-parameter steam extraction opening.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
Referring to fig. 1, the energy storage and heat supply system of the thermal power plant for energy gradient utilization according to the present invention includes a boiler 1, a steam turbine 2, an energy storage device 3, a condenser 4, a condensate pump 5, a low pressure heater 6, a deaerator 7, a feed pump 8, and a high pressure heater 9;
the steam outlet of the boiler 1 is communicated with the inlet of the steam turbine 2, the high-parameter steam extraction port 10 and the low-parameter steam extraction port 11 of the steam turbine 2 are communicated with the inlet of the energy storage device 3, the outlet of the energy storage device 3 is communicated with the inlet of the condenser 4, the exhaust steam outlet of the steam turbine 2 is communicated with the inlet of the condenser 4, the outlet of the condenser 4 is communicated with the inlet of the high-pressure heater 9 through the condensate pump 5, the low-pressure heater 6, the deaerator 7 and the water feeding pump 8, and the outlet of the high-pressure heater 9 is communicated with the inlet of the boiler 1.
The high-parameter extraction opening 10 of the steam turbine 2 is communicated with the inlet of the energy storage device 3 through a first valve, and the low-parameter extraction opening 11 of the steam turbine 2 is communicated with the inlet of the energy storage device 3 through a second valve.
The invention relates to a thermal power plant energy storage and heat supply method with energy gradient utilization, which comprises the following steps:
superheated steam output by the boiler 1 enters the steam turbine 2 to do work, exhaust steam discharged by the steam turbine 2 enters the condenser 4 to be condensed into condensed water, and the condensed water sequentially enters the boiler 1 through the condensed water pump 5, the low-pressure heater 6, the deaerator 7, the water feed pump 8 and the high-pressure heater 9 to form a complete cycle.
The high-parameter steam extraction and the low-parameter steam extraction output by the steam turbine 2 are subjected to heat release and condensation in the energy storage device 3 to form condensed water, heat is stored in a heat storage medium in the energy storage device 3 and then enters the condenser 4, and energy storage is realized through the energy storage device 3.
And part of the circulating backwater of the heat supply network or all of the circulating backwater of the heat supply network enters the energy storage device 3, is heated and heated through the heat storage medium, then enters the heat supply network, and simultaneously realizes the energy release of the heat storage medium in the energy storage device 3.
In actual operation, the second valve is opened, the first valve is closed, low-parameter extraction steam output by the steam turbine 2 is input into the energy storage device 3, after the temperature of an energy storage medium in the energy storage device 3 is increased to a preset temperature, the first valve is opened gradually, the second valve is closed gradually, high-parameter extraction steam output by the steam turbine 2 is input into the energy storage device 3 until the opening degree of the first valve is adjusted to be maximum, the second valve is closed, and at the moment, only the high-parameter extraction steam output by the steam turbine 2 is input into the energy storage device 3.
Claims (8)
1. A thermal power plant energy storage and heat supply system with energy gradient utilization is characterized by comprising a boiler (1), a steam turbine (2) and an energy storage device (3);
the steam outlet of the boiler (1) is communicated with the inlet of the steam turbine (2), the high-parameter steam extraction port (10) of the steam turbine (2) is communicated with the inlet of the energy storage device (3) through a first valve, and the low-parameter steam extraction port (11) of the steam turbine (2) is communicated with the inlet of the energy storage device (3) through a second valve.
2. The thermal power plant energy storage and heat supply system for energy cascade utilization according to claim 1, further comprising a condenser (4), a low-pressure heater (6), a deaerator (7) and a high-pressure heater (9), wherein an outlet of the energy storage device (3) is communicated with an inlet of the condenser (4), an exhaust steam outlet of the steam turbine (2) is communicated with an inlet of the condenser (4), an outlet of the condenser (4) is communicated with an inlet of the high-pressure heater (9) through the low-pressure heater (6) and the deaerator (7), and an outlet of the high-pressure heater (9) is communicated with an inlet of the boiler (1).
3. The thermal power plant energy storage and heating system with energy cascade utilization according to claim 1, characterized in that the energy storage device (3) is connected with an external heating network.
4. The thermal power plant energy storage and heat supply system for energy cascade utilization according to claim 2, wherein an outlet of the condenser (4) is communicated with the low-pressure heater (6) through a condensate pump (5).
5. The thermal power plant energy storage and heating system with energy cascade utilization according to claim 2, characterized in that the deaerator (7) is communicated with the inlet of the high-pressure heater (9) through a feed water pump (8).
6. A thermal power plant energy storage and heat supply method based on energy cascade utilization is characterized in that the thermal power plant energy storage and heat supply system based on the energy cascade utilization of claim 3 comprises the following steps:
the method comprises the steps of firstly opening a second valve, closing a first valve, inputting low-parameter extraction steam output by a steam turbine (2) into an energy storage device (3), gradually opening the first valve after the temperature of an energy storage medium in the energy storage device (3) rises to a preset temperature, gradually closing the second valve, inputting high-parameter extraction steam output by the steam turbine (2) into the energy storage device (3) until the opening degree of the first valve is adjusted to be maximum, closing the second valve, and inputting only the high-parameter extraction steam output by the steam turbine (2) into the energy storage device (3) at the moment.
7. The method for storing and supplying heat to the thermal power plant by utilizing the energy in a gradient manner according to claim 6, wherein superheated steam output by the boiler (1) enters the steam turbine (2) to do work, exhaust steam discharged by the steam turbine (2) enters the condenser (4) to be condensed into condensed water, and the condensed water sequentially enters the boiler (1) through the low-pressure heater (6), the deaerator (7) and the high-pressure heater (9).
8. The method for storing and supplying heat to the thermal power plant by utilizing the energy in a cascading manner according to claim 6, wherein the high-parameter steam extraction and the low-parameter steam extraction output by the steam turbine (2) are released and condensed into condensed water in the energy storage device (3), heat is stored in a heat storage medium in the energy storage device (3) and then enters the condenser (4), and the energy storage is realized through the energy storage device (3).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111267192.9A CN113983445A (en) | 2021-10-28 | 2021-10-28 | Thermal power plant energy storage and heat supply system and method for energy gradient utilization |
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| CN202111267192.9A CN113983445A (en) | 2021-10-28 | 2021-10-28 | Thermal power plant energy storage and heat supply system and method for energy gradient utilization |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114877397A (en) * | 2022-05-11 | 2022-08-09 | 三河发电有限责任公司 | Coal-fired heating system |
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| CN106703908A (en) * | 2015-11-12 | 2017-05-24 | 国网智能电网研究院 | Rankine cycle system with phase change energy storage heat exchanger |
| CN110906774A (en) * | 2019-12-09 | 2020-03-24 | 东方电气集团东方锅炉股份有限公司 | Concrete heat storage and exchange system for peak regulation heat supply of thermal power plant and operation method thereof |
| US20210033004A1 (en) * | 2019-03-11 | 2021-02-04 | Univ Xi An Jiaotong | Flexible coal-fired power generation system and operation method thereof |
| CN112855293A (en) * | 2021-01-19 | 2021-05-28 | 西安交通大学 | Integrated heat storage industrial steam supply cogeneration peak shaving frequency modulation system and operation method |
| CN113153465A (en) * | 2021-04-30 | 2021-07-23 | 中国电力工程顾问集团西北电力设计院有限公司 | Heat supply and power generation decoupling method and system for improving peak regulation capacity of heat supply unit |
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2021
- 2021-10-28 CN CN202111267192.9A patent/CN113983445A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106703908A (en) * | 2015-11-12 | 2017-05-24 | 国网智能电网研究院 | Rankine cycle system with phase change energy storage heat exchanger |
| US20210033004A1 (en) * | 2019-03-11 | 2021-02-04 | Univ Xi An Jiaotong | Flexible coal-fired power generation system and operation method thereof |
| CN110906774A (en) * | 2019-12-09 | 2020-03-24 | 东方电气集团东方锅炉股份有限公司 | Concrete heat storage and exchange system for peak regulation heat supply of thermal power plant and operation method thereof |
| CN112855293A (en) * | 2021-01-19 | 2021-05-28 | 西安交通大学 | Integrated heat storage industrial steam supply cogeneration peak shaving frequency modulation system and operation method |
| CN113153465A (en) * | 2021-04-30 | 2021-07-23 | 中国电力工程顾问集团西北电力设计院有限公司 | Heat supply and power generation decoupling method and system for improving peak regulation capacity of heat supply unit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114877397A (en) * | 2022-05-11 | 2022-08-09 | 三河发电有限责任公司 | Coal-fired heating system |
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