CN211777622U - Compressed air energy storage system coupled with coal-fired cogeneration unit - Google Patents
Compressed air energy storage system coupled with coal-fired cogeneration unit Download PDFInfo
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- CN211777622U CN211777622U CN201922121981.6U CN201922121981U CN211777622U CN 211777622 U CN211777622 U CN 211777622U CN 201922121981 U CN201922121981 U CN 201922121981U CN 211777622 U CN211777622 U CN 211777622U
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Abstract
The utility model discloses a compressed air energy storage system with coupling of coal-fired cogeneration unit. The system comprises a steam turbine system, a heat supply network heating system and a compressed air energy storage system. The utility model, by coupling the steam turbine system and the compressed air energy storage system, stores the excess electric energy through the compressed air in the electricity consumption valley period, and simultaneously recovers the heat generated during air compression for heating the return water of the heat supply network; when the power load is high, the steam is extracted from the high-pressure cylinder of the steam turbine, and the released compressed air is heated, so that the compressed air enters the air expander to fully work and generate power, and more electric energy is provided. Through the utility model discloses, can effectively promote flexibility and the economic nature of coal-fired cogeneration of heat and power unit.
Description
Technical Field
The utility model relates to a compressed air energy storage technical field, in particular to with energy storage system of cogeneration unit coupling, concretely relates to with compressed air energy storage system of coal-fired cogeneration unit coupling.
Background
In recent years, with the rapid development of national economy, the peak-to-valley difference of the power load of a power grid is gradually increased, and meanwhile, the requirement of a user on the quality of basic power consumption and electric energy is higher and higher, so that corresponding measures must be taken to adjust the unbalanced load in the power grid, so that the purposes of ensuring the stable operation of a power system and meeting the requirements of the user are achieved, namely, the peak regulation of the power load is needed. In general, a power grid depends on a power generating unit such as a thermal power generating unit and a gas turbine unit to perform peak shaving. When the generator set is configured, the load allowance is reserved, namely, the generator set works in a non-full-load low-efficiency operation state. The method comprises the steps of increasing the output of a generator set during peak electricity utilization to ensure the electricity utilization of customers, reducing the output of the generator set during valley electricity utilization to balance a power supply side and a load side, namely, carrying out peak regulation on a power grid in a mode of frequently adjusting the load. Such peak regulation state is not only uneconomical and efficient, but also not beneficial to the safe and stable operation of the unit. Taking a thermal power generating unit as an example, the thermal power generating unit has higher coal consumption in a frequent peak regulation state, shortens the overhaul time of the unit, increases the operation cost, and is unreasonable. The energy storage technology developed vigorously in recent years can store redundant electric energy of a generator set such as new energy and the like during the low-ebb electricity consumption, especially store energy during the low-load night, and release the stored electric energy in a reasonable mode during the peak electricity consumption of a power grid, so that the purpose of peak regulation/peak clipping and valley filling is achieved. Therefore, the pressure of the urban large peak-valley difference on the power grid can be reasonably reduced, and scientific energy-saving and emission-reducing effects can be achieved.
Aiming at a cogeneration power plant in China, the energy storage optimization operation of the thermal power plant is provided, namely, a steam turbine and an air compressor are coupled with an energy storage system to store and utilize surplus electric energy generated by a steam turbine set during the load valley period of a power grid. According to the newly proposed system, through the arrangement of the steam turbine and the air compressor, for the steam turbine unit, the extracted steam of the steam turbine unit is used for heating the return water of the heat supply network and the compressed air, the return water temperature of the heat supply network and the temperature of the compressed air are improved, the steam heat is effectively utilized, the working capacity of the compressed air is increased, the heat supply is realized, and the energy utilization rate is also improved; for the air compressor unit, the air compressor compresses air by utilizing the surplus electric energy produced by the steam turbine unit during the low-ebb period of the power grid load, the air enters the air storage tank for storage, and the compressed air is released to enter the air expander for power generation during the high-peak period of the power grid load, so that the electric energy loss of the steam turbine unit can be effectively reduced, and the peak regulation capacity of the steam turbine unit is improved.
Disclosure of Invention
The utility model discloses to the surplus problem of electric energy when the steam turbine unit moves at electric wire netting load valley period, provide one kind with the compressed air energy storage system of coal-fired cogeneration unit coupling, through coupling steam turbine system and compressed air system realization steam turbine unit's energy storage and peak shaving, utilize from the steam extraction in the communicating pipe between the steam turbine low pressure cylinder, heat the heat supply network return water, be used for the heat supply, utilize the last stage steam extraction from the steam turbine high pressure cylinder to be used for heating compressed air, make compressed air get into the air expander power generation of doing work after the heat absorption. The utility model, by coupling the steam turbine system and the compressed air energy storage system, stores the excess electric energy through the compressed air in the electricity consumption valley period, and simultaneously recovers the heat generated during air compression for heating the return water of the heat supply network; when the power load is high, the steam is extracted from the last stage of the high-pressure cylinder of the steam turbine, and the released compressed air is heated, so that the compressed air enters the air expansion machine to fully work and generate power, more electric energy is provided, and the flexibility and the economy of the coal-fired cogeneration unit are effectively improved.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a compressed air energy storage system coupled with a coal-fired cogeneration unit mainly comprises a steam turbine system, a heat supply network heating system and a compressed air energy storage system; the steam turbine system is characterized in that a steam turbine high-pressure cylinder is connected with a steam turbine intermediate-pressure cylinder in series, a last-stage steam extraction port of the steam turbine high-pressure cylinder is connected with a steam inlet of a second heater, a steam outlet of a communicating pipe of the steam turbine intermediate-pressure cylinder is connected with a steam inlet of a third heat exchanger, the steam turbine intermediate-pressure cylinder is connected with a steam turbine low-pressure cylinder in series, and the steam turbine low-pressure cylinder is connected with a first generator in series; in the heat supply network heating system, a water outlet of a first heat exchanger is connected with a water inlet of a third heat exchanger; in the compressed air energy storage system, a generator is connected with an air compressor, an air outlet of the air compressor is connected with an air inlet of a heat exchanger, an air outlet of the heat exchanger is connected with an air inlet of an air storage tank, an air outlet of the air storage tank is connected with an air inlet of a heat exchanger, an air outlet of the heat exchanger is connected with an air inlet of an air expander, and the air expander is connected with the generator in series.
The turbine system uses the surplus electric energy generated by the first generator in the low-ebb period of the power grid load to compress air by the air compressor, and stores the compressed air in the air storage tank. The electric energy which can be wasted originally in the load valley period of the power grid is effectively stored, so that the energy is saved, and the energy utilization efficiency of the whole system is improved.
The network heating system enables the extracted steam from the low-pressure cylinder communicating pipe in the steam turbine to pass through the third heat exchanger to heat the backwater of the heat network, and enables the high-temperature compressed gas compressed by the air compressor to pass through the first heat exchanger to heat the backwater of the heat network for supplying heat.
The compressed air energy storage system absorbs the surplus electric energy produced by the steam turbine system in the low-ebb period of the power grid load, the air is compressed by the air compressor and then enters the air storage tank, the air storage tank releases compressed air in the high-peak period of the power grid load, and the compressed air enters the air expansion machine to do work after absorbing heat from the last-stage steam extraction of the high-pressure cylinder of the steam turbine by the second heat exchanger, so that the second generator is driven to generate power.
The utility model has the advantages of it is following and effect:
1) the surplus electric energy in the load valley period of the power grid is used for the air compressor to compress air, and the compressed air is stored in the air storage tank, so that the electric energy which is wasted in the load valley period of the power grid is effectively stored, the energy is saved, and the energy utilization efficiency of the whole system is improved;
2) the heat energy of the compressed air is used for heating the backwater of the heat supply network, so that under the original running working condition of the steam turbine set, the energy is saved, the energy utilization efficiency of the whole system is improved, and the heat economy of the steam turbine set is optimized;
3) the method and the device realize the sliding adjustment of the generating power of the steam turbine set, can flexibly output corresponding electric energy according to the load condition of a power grid, and improve the peak regulation capacity of the steam turbine set.
Drawings
FIG. 1 is a schematic diagram of a compressed air energy storage system coupled to a coal fired cogeneration unit.
In the figure: 1-a high-pressure cylinder of a steam turbine; 2-a steam turbine intermediate pressure cylinder; 3-low pressure cylinder of steam turbine; 4-a first generator; 5-an air compressor; 6-heat exchanger number one; 7-a gas storage tank; 8-heat exchanger II; 9-an air expander; 10-generator number two; 11-heat exchanger number three.
Detailed Description
The utility model provides a compressed air energy storage system with coal-fired cogeneration unit coupling, the explanation is given below in combination with the figure and the example.
A compressed air energy storage system coupled with a coal-fired cogeneration unit as shown in fig. 1, which mainly comprises a steam turbine system, a heat supply network heating system and a compressed air energy storage system; the steam turbine system is characterized in that a steam turbine high-pressure cylinder 1 is connected with a steam turbine intermediate-pressure cylinder 2 in series, a last-stage steam extraction port of the steam turbine high-pressure cylinder 1 is connected with a steam inlet of a second heater 8, a steam outlet of a communicating pipe of the steam turbine intermediate-pressure cylinder is connected with a steam inlet of a third heat exchanger 11, the steam turbine intermediate-pressure cylinder 2 is connected with a steam turbine low-pressure cylinder 3 in series, and the steam turbine low-pressure cylinder 3 is connected with a first generator 4 in series; in the heat supply network heating system, the water outlet of the first heat exchanger 6 is connected with the water inlet of the third heat exchanger 11; in the compressed air energy storage system, a generator 4 is connected with an air compressor 5, an air outlet of the air compressor 5 is connected with an air inlet of a heat exchanger 6, an air outlet of the heat exchanger 6 is connected with an air inlet of a gas storage tank 7, an air outlet of the gas storage tank 7 is connected with an air inlet of a heat exchanger 8, an air outlet of the heat exchanger 8 is connected with an air inlet of an air expander 9, and the air expander 9 is connected with a generator 10 in series.
The turbine system uses the surplus electric energy generated by the first generator 4 in the low-load valley period of the power grid to compress air by the air compressor 5, and stores the compressed air in the air storage tank 7. The electric energy which can be wasted originally in the load valley period of the power grid is effectively stored, so that the energy is saved, and the energy utilization efficiency of the whole system is improved.
The network heating system heats backwater of a heating network by enabling extracted steam from a communicating pipe of a low-pressure cylinder in the steam turbine to pass through the third heat exchanger 11, and heats backwater of the heating network by enabling high-temperature compressed gas compressed by the air compressor 5 to pass through the first heat exchanger 6 for heating.
The compressed air energy storage system absorbs the surplus electric energy produced by the steam turbine system in the low valley period of the power grid load, the air is compressed by the air compressor 5 and then enters the air storage tank 7, the air storage tank 7 releases compressed air in the peak period of the power grid load, and the compressed air enters the air expander 9 to do work after absorbing heat from the last stage steam extraction of the high pressure cylinder of the steam turbine by the second heat exchanger 8 so as to drive the second generator 10 to generate power.
The following examples are given to illustrate specific control procedures:
when the steam turbine system operates under the working condition of a power grid load valley period, steam is extracted from a communicating pipe between the low-pressure cylinders and the low-pressure cylinders of the steam turbine and enters the third heat exchanger 11 to heat return water of a heat supply network, surplus electric energy produced by the first generator 4 is used for the air compressor 5, and compressed air enters the first heat exchanger 6 to heat return water of the heat supply network and then enters the air storage tank 7; when the steam turbine system operates under the working condition of the load peak period of the power grid, the air storage tank 7 releases compressed air, steam is extracted from a communicating pipe between the low-pressure cylinder and the low-pressure cylinder of the steam turbine, enters the third heat exchanger 11 to heat return water of the heat grid, and steam is extracted from the last stage of the high-pressure cylinder 1 of the steam turbine and enters the second heater 8 to heat the compressed air, so that the compressed air is fully expanded, the air expander 9 is pushed to do work, and the second generator 10 is driven to generate power.
The system uses electric energy to compress air in the low ebb period of the power grid load by coupling the steam turbine system and the compressed air energy storage system, recovers heat generated during air compression, is used for heating return water of a heat supply network, releases the compressed air to expand to do work and generate power in the high ebb period of the power grid load, avoids electric energy loss, realizes flexible peak regulation of the steam turbine set, and improves the economy of the steam turbine set.
In addition, it should be noted that the shapes, names, and the like of the components of the embodiments described in the present specification may be different. All equivalent or simple changes made according to the structure, characteristics and principle of the utility model are included in the protection scope of the utility model. Various modifications, additions and substitutions may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (4)
1. A compressed air energy storage system coupled with a coal-fired cogeneration unit mainly comprises a steam turbine system, a heat supply network heating system and a compressed air energy storage system; the steam turbine system is characterized in that a steam turbine high-pressure cylinder (1) is connected with a steam turbine intermediate-pressure cylinder (2) in series, a last-stage steam extraction port of the steam turbine high-pressure cylinder (1) is connected with a steam inlet of a second heat exchanger (8), a steam outlet of a steam turbine intermediate-pressure cylinder communicating pipe is connected with a steam inlet of a third heat exchanger (11), the steam turbine intermediate-pressure cylinder (2) is connected with a steam turbine low-pressure cylinder (3) in series, and the steam turbine low-pressure cylinder (3) is connected with a first generator (4) in series; in the heat supply network heating system, the water outlet of the first heat exchanger (6) is connected with the water inlet of the third heat exchanger (11); in the compressed air energy storage system, a first generator (4) is connected with an air compressor (5), an air outlet of the air compressor (5) is connected with an air inlet of a first heat exchanger (6), an air outlet of the first heat exchanger (6) is connected with an air inlet of an air storage tank (7), an air outlet of the air storage tank (7) is connected with an air inlet of a second heat exchanger (8), an air outlet of the second heat exchanger (8) is connected with an air inlet of an air expander (9), and the air expander (9) is connected with a second generator (10) in series.
2. A compressed air energy storage system coupled to a coal-fired cogeneration unit according to claim 1, wherein said turbine system uses excess electrical energy generated by generator number one (4) during a grid load valley period for air compression by an air compressor (5) and stores the compressed air in an air storage tank (7).
3. The compressed air energy storage system coupled with the coal-fired cogeneration unit according to claim 1, wherein the grid heating system passes the extracted steam from the communicating pipe of the low and medium pressure cylinders of the steam turbine through the third heat exchanger (11) to heat the return water of the heat supply grid, and passes the high temperature compressed gas compressed by the air compressor (5) through the first heat exchanger (6) to heat the return water of the heat supply grid for supplying heat.
4. The compressed air energy storage system coupled with the coal-fired cogeneration unit according to claim 1, wherein the compressed air energy storage system absorbs the excess electric energy generated by the steam turbine system during the low-ebb period of the grid load, compresses air by the air compressor (5) and then enters the air storage tank (7), releases compressed air by the air storage tank (7) during the high-peak period of the grid load, absorbs heat from the last stage steam extraction of the high-pressure cylinder of the steam turbine by the second heat exchanger (8) and then enters the air expander (9) to do work, and drives the second generator (10) to generate electricity.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922121981.6U CN211777622U (en) | 2019-12-02 | 2019-12-02 | Compressed air energy storage system coupled with coal-fired cogeneration unit |
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| CN201922121981.6U CN211777622U (en) | 2019-12-02 | 2019-12-02 | Compressed air energy storage system coupled with coal-fired cogeneration unit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112412561A (en) * | 2020-11-11 | 2021-02-26 | 贵州电网有限责任公司 | Compressed air energy storage system and thermal power plant control system coupling control method |
| CN113090389A (en) * | 2021-04-08 | 2021-07-09 | 西安热工研究院有限公司 | Compressed air energy storage power generation and heat supply system and method applied to supercooling degree of steam |
| CN113339774A (en) * | 2021-04-29 | 2021-09-03 | 华电电力科学研究院有限公司 | Multi-energy combined supply system based on steam gradient utilization of thermoelectric unit and adjusting method |
| CN113565591A (en) * | 2021-07-29 | 2021-10-29 | 西安热工研究院有限公司 | Combined heat and power generation unit coupled air energy storage expansion power generation system and optimized operation method |
| CN116771454A (en) * | 2021-02-05 | 2023-09-19 | 杨文清 | Liquefied air energy storage device |
-
2019
- 2019-12-02 CN CN201922121981.6U patent/CN211777622U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112412561A (en) * | 2020-11-11 | 2021-02-26 | 贵州电网有限责任公司 | Compressed air energy storage system and thermal power plant control system coupling control method |
| CN116771454A (en) * | 2021-02-05 | 2023-09-19 | 杨文清 | Liquefied air energy storage device |
| CN113090389A (en) * | 2021-04-08 | 2021-07-09 | 西安热工研究院有限公司 | Compressed air energy storage power generation and heat supply system and method applied to supercooling degree of steam |
| CN113339774A (en) * | 2021-04-29 | 2021-09-03 | 华电电力科学研究院有限公司 | Multi-energy combined supply system based on steam gradient utilization of thermoelectric unit and adjusting method |
| CN113565591A (en) * | 2021-07-29 | 2021-10-29 | 西安热工研究院有限公司 | Combined heat and power generation unit coupled air energy storage expansion power generation system and optimized operation method |
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