CN215174935U - High-low temperature heat storage peak shaving system of thermal power plant - Google Patents
High-low temperature heat storage peak shaving system of thermal power plant Download PDFInfo
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- CN215174935U CN215174935U CN202120169003.3U CN202120169003U CN215174935U CN 215174935 U CN215174935 U CN 215174935U CN 202120169003 U CN202120169003 U CN 202120169003U CN 215174935 U CN215174935 U CN 215174935U
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Abstract
The utility model relates to a high-low temperature heat storage peak shaving system of a thermal power plant, which comprises a boiler system, a steam turbine power generation system, a high-temperature heat storage device and a low-temperature heat storage device; the high-temperature heat storage device stores heat by using high-temperature steam at a steam outlet of a boiler system, cooled condensed water is mixed with water fed from an inlet of the boiler, and when the high-temperature heat storage device releases heat, part of the water fed from the inlet of the boiler enters the high-temperature heat storage device to generate high-temperature steam; the low-temperature heat storage device stores heat by using feed water at the inlet of the boiler, the feed water with the reduced temperature is mixed with feed water at the inlet of a regenerative heater of the steam turbine power generation system, when the low-temperature heat storage device releases heat, a part of feed water at the inlet of the regenerative heater enters the low-temperature heat storage device, and the heated feed water is mixed with feed water at the outlet of the regenerative heater; the high-low temperature mixed heat storage improves the variable load rate and the variable load range of the power generation of the thermal power plant, increases the power generation and heat supply flexibility of the thermal power plant, and efficiently outputs electricity and heat according to different load requirements.
Description
Technical Field
The utility model relates to a peak shaving technique of thermal power plant especially relates to a thermal power plant's heat-retaining peak shaving system.
Background
With the huge consumption of traditional fossil energy, people face increasingly severe energy and environmental problems. A new energy technology revolution is to start with the improvement of energy utilization efficiency and the optimization of energy consumption structure. Thermal power is the most important power supply source in China. Clean, efficient and flexible operation becomes an important target for transformation development of the thermal power industry. With the continuous expansion of the proportion of unstable new energy resources such as photovoltaic energy, wind power and the like in China, the volatility and randomness of high-proportion wind power and photovoltaic power generation can put higher requirements on the flexibility of an electric power system, and meanwhile, the problems of low inertia and safety and stability of the system caused by grid connection of a power electronic device of the system can cause the electric power system to pay higher cost for consuming high-proportion renewable energy resources. As traditional thermal power still accounts for a major share, the market demand for flexible retrofit of thermal power plants continues to expand.
In addition, more thermal power plants are newly built in order to meet the increasing winter heating demand and relieve the problem of insufficient heat supply sources in part of urban area heat supply. However, the heating load and the power load are asynchronous, so that the problems that the low-heat-load stable combustion of the boiler is difficult or the high-heat-load steam is wasted are caused. The improvement of the peak regulation capability of a heating power plant in a heating area in China during the heating season is also one of the targets of thermal power flexibility improvement.
Significant changes are occurring in the structure of power installations and in the structure of power consumption. The operation target of the thermal power generating unit gradually changes from pursuing high efficiency and energy conservation to focusing on improving the flexibility of the unit, and the deep peak regulation and quick start-stop capability of the unit are improved. The flexible modification of thermal power is implemented not only by the need of survival and development of thermal power enterprises, but also by the inevitable requirement of promoting the whole power energy production and consumption revolution.
At present, the relatively mature thermal power flexibility improvement technology at home and abroad mainly comprises: the method comprises the steps of unit body peak regulation transformation, low-load coordinated control optimization, plasma/micro-oil combustion supporting technology, cogeneration unit thermoelectric decoupling technology and the like. But still faces the problems of high operation cost, low thermoelectric utilization efficiency, obvious increase of coal consumption, limited peak regulation range and the like.
Disclosure of Invention
The utility model discloses the problem that exists in the nimble transformation of thermal power plant more than the needle has provided a mixed heat storage peak regulation system of high low temperature, reduces the heat-retaining cost, improves heat utilization efficiency, promotes the quick climbing of unit and opens the ability that stops fast. The utility model discloses concrete scheme is as follows:
a high-low temperature heat storage peak shaving system of a thermal power plant comprises a high-temperature heat storage device, a low-temperature heat storage device, a boiler system and a steam turbine system. The high-temperature heat storage device and the low-temperature heat storage device are provided with a cold end and a hot end, the cold end of the heat storage device flows in or out of a low-temperature heat exchange working medium, and the hot end of the heat storage device flows in or out of a high-temperature heat exchange working medium. And a water supply inlet of the boiler system is connected with a cold end water working medium interface of the high-temperature heat storage device, and a high-temperature steam outlet of the boiler system is connected with a hot end water working medium interface of the high-temperature heat storage device. The steam turbine system comprises a steam turbine, a condenser, a regenerative heater and a water feeding pump. The high-temperature steam outlet of the boiler system is connected with the steam turbine inlet, the steam turbine steam extraction port is connected with the steam extraction inlet of the regenerative heater, the steam turbine steam exhaust port is connected with the steam inlet of the condenser, the condensed water outlet of the condenser is connected with the inlet of the water feed pump, the outlet of the water feed pump is connected with the water feed inlet of the regenerative heater, and the water feed outlet of the regenerative heater is connected with the water feed inlet of the boiler system. And the cold end water working medium interface of the low-temperature heat storage device is connected with the water supply inlet of the regenerative heater, and the hot end water working medium interface of the low-temperature heat storage device is connected with the water supply outlet of the regenerative heater.
Preferably, the regenerative heater is divided into a high-pressure regenerative heater, a deaerator and a low-pressure regenerative heater, which are sequentially connected in series, namely, a water supply outlet of the low-pressure regenerative heater is connected with a water supply inlet of the deaerator, and a water supply outlet of the deaerator is connected with a water supply inlet of the high-pressure heater.
Further, the heat storage medium in the low-temperature heat storage device is one or more of sensible heat storage, thermochemical heat storage or phase change heat storage, and the heat storage medium in the high-temperature heat storage device is one or more of sensible heat storage, thermochemical heat storage or phase change heat storage.
Preferably, the high-temperature heat storage device is a molten salt heat storage device and comprises a high-temperature molten salt storage tank, a low-temperature molten salt storage tank and a molten salt/water working medium heat exchanger, the high-temperature molten salt storage tank is connected with a hot-end molten salt working medium interface of the molten salt/water working medium heat exchanger, a cold-end molten salt working medium interface of the molten salt/water working medium heat exchanger is connected with the low-temperature molten salt storage tank, a water supply inlet of the boiler system is connected with a cold-end water working medium interface of the molten salt/water working medium heat exchanger, and the hot-end water working medium interface of the molten salt/water working medium heat exchanger is connected with a high-temperature steam outlet of the boiler system. The low-temperature heat storage device has a heat supply function, namely an inlet and an outlet of hot water supply working medium, the low-temperature hot water supply working medium enters from the inlet of the hot water supply working medium, and flows out from the outlet of the hot water supply working medium after being heated by the low-temperature heat storage device, so that a heat source is provided for a heat user. During heat storage, high-temperature steam of a boiler system heats low-temperature molten salt coming out of the low-temperature molten salt storage tank in the molten salt/water working medium heat exchanger, cooled condensed water enters a water supply inlet of the boiler system, and the heated high-temperature molten salt enters the high-temperature molten salt storage tank; when heat is released, the high-temperature molten salt discharged from the high-temperature molten salt storage tank heats water supply in the molten salt/water working medium heat exchanger to generate high-temperature steam, the high-temperature steam enters the steam turbine system or enters the boiler system for further heating and then enters the steam turbine system, and the cooled low-temperature molten salt enters the low-temperature molten salt storage tank.
The utility model discloses in high temperature heat-retaining device utilizes boiler system's high temperature steam carries out the heat-retaining, and the condensate water after the high temperature steam cooling gets into the boiler heating again as the feedwater and produces high temperature steam, and high temperature heat-retaining device produces the steam heat energy storage that the boiler system is surplus, avoids the emergence of unstable and blowing out the scheduling problem of boiler low-load combustion. When the high-temperature heat storage device releases heat, part of the feed water at the outlet of the regenerative heater enters the high-temperature heat storage device to generate high-temperature steam, and the high-temperature steam enters the boiler system to be continuously heated or directly enters the steam turbine to do work. Therefore, the high-temperature heat storage device can directly generate high-temperature steam for water supply, the heat load of the boiler is reduced, the electric load of the system is quickly improved, and the high-efficiency operation of the boiler is ensured. The low-temperature heat storage device stores heat by utilizing the feed water at the outlet of the regenerative heater in the steam turbine system, and the cooled feed water enters the feed water inlet of the regenerative heater again. When the low-temperature heat storage device stores heat, more steam turbine extraction steam is needed to heat the feed water, and the heated feed water stores the heat in the low-temperature heat storage device, so that the extraction amount of the steam turbine can be greatly increased, the work output of the steam turbine is reduced, and the requirement of low power load is met. When the low-temperature heat storage device releases heat, one part of the feed water enters the low-temperature heat storage device, the other part of the feed water enters the regenerative heater, and the feed water heated by the two parts of the feed water is used as the feed water of the boiler system and the high-temperature heat storage device. The low-temperature heat storage device partially supplies water, and the water supply amount entering the regenerative heater is reduced, so that the steam extraction amount of the steam turbine is reduced, the work output of the steam turbine can be improved, and the demand when the power load is increased is met. Meanwhile, the low-temperature heat storage device can supply heat to the outside, namely the low-temperature heat storage device can heat the water medium supplying heat to the outside, and the heated water medium is used as a heat source for an external heat user, so that the flexibility of external heat supply is improved.
The steam turbine in the utility model refers to a device which uses high-temperature and high-pressure steam to do work, and is also called a steam turbine; the regenerative heater is a device for heating water supply by using extracted steam in a steam turbine; the boiler system is a device for heating feed water to generate high-temperature steam by using fuel combustion; the molten salt/water working medium heat exchanger is a device which is used for carrying out heat exchange by utilizing the temperature difference of molten salt and water working medium, wherein the working medium on the cold side and the hot side of the heat exchanger are respectively molten salt and water; the condenser is a device for cooling and condensing the exhaust gas of the steam turbine into liquid water.
The utility model stores the heat energy of different grades in the power generation system of the thermal power plant in high and low temperature steps, the high temperature water vapor generated by the boiler system is stored by utilizing the high temperature heat storage device (fused salt medium), and the high temperature water vapor can be generated during the heat release to carry out the rapid load-increasing power generation; the temperature of the water supply heated by the heat recovery system is relatively low, the low-temperature heat storage device is used for storing heat, and when the electric load needs to be increased or the external heat supply load needs to be supplied, the low-temperature heat storage device can be used for rapidly increasing the load. exergy loss during heat storage and release can be effectively reduced through high-low temperature step heat storage, heat utilization efficiency and variable load rate are improved, and heat storage cost is reduced.
Drawings
FIG. 1 is a schematic view of specific example 1;
FIG. 2 is a schematic view of embodiment 2.
In the figure: 1-a high temperature heat storage device; 2-a boiler system; 3-a condensate circulating pump; 4-a condensate valve; 5-a water supply circulating pump; 6-low temperature heat storage device; 7-a regenerative heater; 8-a feedwater circulation valve; 9-a water supply pump; 10-a condenser; 11-a steam turbine; 12-a generator; 13-molten salt/water working medium heat exchanger; 14-low temperature molten salt storage tank; 15-high temperature molten salt storage tank.
Detailed Description
Example 1
The utility model provides a high low temperature heat-retaining system of peak regulation of thermal power plant, as shown in figure 1, including high temperature heat-retaining device 1, boiler system 2, low temperature heat-retaining device 6, backheat heater 7, condenser 10, steam turbine 11, generator 12. When the high-temperature heat storage device 1 and the low-temperature heat storage device 6 do not work, high-temperature steam generated by the boiler system 2 enters the steam turbine 11 to do work and drives the generator 12 to generate electricity, exhaust steam of the steam turbine 11 enters the condenser 10 to be condensed into liquid water, the liquid water is boosted by the water feeding pump 9 and enters the regenerative heater 7, the regenerative heater 7 heats feed water by using extracted steam of the steam turbine 11 to improve the temperature of the feed water, and the feed water is heated after entering the boiler system 2 to generate high-temperature steam and then enters the steam turbine 11 again to do work.
When the high-temperature heat storage device 1 stores heat, the condensation water valve 4 is closed, part of high-temperature steam generated from the boiler system 2 enters from the hot end of the high-temperature heat storage device 1, the heat released by the high-temperature steam is changed into condensation water, the heat storage medium in the heat storage device 1 is heated, and the condensation water enters the water supply inlet of the boiler system again through the condensation water circulating pump 3. When the high-temperature heat storage device 1 releases heat, the condensation water valve 4 is opened, part of the feed water enters the cold end of the high-temperature heat storage device 1, and high-temperature steam is generated after the feed water is heated by the high-temperature heat storage device 1 and enters the steam turbine 11 to do work. The high-temperature heat storage device 1 is used for heat storage or heat release, so that the steam quantity entering the steam turbine 11 can be quickly changed, the output work of the steam turbine 11 is quickly adjusted, and the variable working condition response rate of the system is improved.
When the low-temperature heat storage device 6 stores heat, the water supply circulating valve 8 is opened, a part of the water supply from the regenerative heater 7 enters the hot end of the low-temperature heat storage device 6 through the water supply circulating pump 5, the water supply cooled by the low-temperature heat storage device 6 flows out from the cold end of the low-temperature heat storage device 6, is mixed with the water supply at the outlet of the water supply pump 9 through the water supply circulating valve 8, and then enters the regenerative heater 7 for heating. When the low-temperature heat storage device 6 releases heat, part of the feed water from the feed water pump 9 enters the cold end of the low-temperature heat storage device 6 through the feed water circulating valve 8, flows out of the hot end of the low-temperature heat storage device 6 after being heated by the low-temperature heat storage device 6, is mixed with the feed water from the regenerative heater 7, and is used as the feed water of the boiler system 2 and the high-temperature heat storage device 1 together. In addition, the low-temperature heat storage device 6 has an external heat supply function, hot water supply working medium enters from a heat supply working medium inlet of the low-temperature heat storage device 6, and flows out from a heat supply working medium outlet of the low-temperature heat storage device 6 after being heated by the low-temperature heat storage device 6, so that a heat source is provided for a heat user. The low-temperature heat storage device 6 can quickly adjust the steam extraction amount of the steam turbine 11, so that the power of the steam turbine 11 is quickly adjusted, heat is supplied to the outside by the low-temperature heat storage device 6, exergy loss is reduced, and the heat supply flexibility is improved.
Example 2
On the basis of embodiment 1, the high-temperature heat storage device 1 is a molten salt heat storage device, as shown in fig. 2, and includes a low-temperature molten salt storage tank 14, a molten salt/water working medium heat exchanger 13, and a high-temperature molten salt storage tank 15. When the fused salt heat storage device stores heat, low-temperature fused salt flows out of the low-temperature fused salt storage tank 14, enters the fused salt/water working medium heat exchanger 13, is heated by high-temperature steam flowing out of the boiler system 2, the heated high-temperature fused salt enters the high-temperature fused salt storage tank 15, the high-temperature steam is cooled into condensed water, and the condensed water enters the inlet of the boiler system 2 through the condensed water circulating pump 3 and serves as boiler feed water. When the molten salt heat storage device releases heat, part of inlet feed water of the boiler system 2 enters the molten salt/water working medium heat exchanger 13 to be heated by high-temperature molten salt flowing out of the high-temperature molten salt storage tank 15, generated high-temperature steam enters the steam turbine 11 to do work, and cooled low-temperature molten salt enters the low-temperature molten salt storage tank 14. The molten salt temperature of the low-temperature molten salt storage tank is 200-300 ℃, and the molten salt temperature of the high-temperature molten salt storage tank can reach 500-600 ℃. The large temperature difference of the cold and hot molten salt can greatly improve the heat storage density of the molten salt. The heat storage temperature of the low-temperature heat storage device is below 300 ℃, and the requirements of industrial steam and resident heat supply are met.
The above embodiments 1 and 2 are only some embodiments of the present invention, and it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these embodiments. The technical solutions of the present invention, which can be modified or substituted equally to the related technical features by those skilled in the art, will fall within the protection scope of the present invention without departing from the principle of the present invention. Details not described in this specification are within the skill of the art that are well known to those skilled in the art.
Claims (8)
1. The high-low temperature heat storage peak regulation system of the thermal power plant comprises a high-temperature heat storage device, a low-temperature heat storage device, a boiler system and a steam turbine system, and is characterized in that a water supply inlet of the boiler system is connected with a cold-end hydraulic interface of the high-temperature heat storage device, a high-temperature steam outlet of the boiler system is connected with a hot-end hydraulic interface of the high-temperature heat storage device, the steam turbine system comprises a steam turbine, a condenser, a regenerative heater and a water supply pump, the cold-end hydraulic interface of the low-temperature heat storage device is connected with the water supply inlet of the regenerative heater, and the hot-end hydraulic interface of the low-temperature heat storage device is connected with a water supply outlet of the regenerative heater.
2. The high-low temperature heat storage and peak regulation system of a thermal power plant as claimed in claim 1, wherein the high-temperature steam outlet of the boiler system is connected with the steam turbine inlet, the steam turbine extraction port is connected with the extraction inlet of the regenerative heater, the steam turbine exhaust port is connected with the steam inlet of the condenser, the condensed water outlet of the condenser is connected with the feed pump inlet, the feed pump outlet is connected with the feed water inlet of the regenerative heater, and the feed water outlet of the regenerative heater is connected with the feed water inlet of the boiler system.
3. The high-low temperature heat storage peak regulation system of a thermal power plant according to claim 1, characterized in that the regenerative heater is divided into a high-pressure regenerative heater, a deaerator and a low-pressure regenerative heater, which are connected in series in sequence, that is, a water supply outlet of the low-pressure regenerative heater is connected with a water supply inlet of the deaerator, and a water supply outlet of the deaerator is connected with a water supply inlet of the high-pressure regenerative heater.
4. The high-low temperature heat storage peak shaving system of thermal power plant according to any one of claims 1, 2 or 3, characterized in that the high-temperature heat storage device is a molten salt heat storage device, and comprises a high-temperature molten salt storage tank, a low-temperature molten salt storage tank and a molten salt/water working medium heat exchanger, wherein the high-temperature molten salt storage tank is connected with a hot-end molten salt working medium interface of the molten salt/water working medium heat exchanger, a cold-end molten salt working medium interface of the molten salt/water working medium heat exchanger is connected with the low-temperature molten salt storage tank, a feed water inlet of the boiler system is connected with a cold-end water working medium interface of the molten salt/water working medium heat exchanger, and the hot-end water working medium interface of the molten salt/water working medium heat exchanger is connected with a high-temperature steam outlet of the boiler system.
5. The high-low temperature heat storage peak shaving system of the thermal power plant as claimed in any one of claims 1, 2 or 3, wherein the low temperature heat storage device is provided with a hot water supply working medium inlet and outlet, and a low temperature hot water supply working medium enters from the hot water supply working medium inlet, is heated by the low temperature heat storage device and then flows out from the hot water supply working medium outlet to provide a heat source for a heat user.
6. The thermal power plant high and low temperature heat storage peak shaving system according to any one of claims 1, 2 or 3, characterized in that the high temperature heat storage device stores heat by using high temperature steam of the boiler system, the high temperature steam is condensed and then enters the boiler again to heat to generate high temperature steam, the low temperature heat storage device stores heat by using feed water at the outlet of the regenerative heater in the turbine system, and the cooled feed water enters the feed water inlet of the regenerative heater again.
7. The thermal power plant high-low temperature heat storage peak shaving system according to claim 6, characterized in that when the high temperature heat storage device releases heat, the feed water at the outlet of the regenerative heater enters the high temperature heat storage device to generate high temperature steam, and the high temperature steam enters the boiler system to continue heating or directly enters the steam turbine to do work; when the low-temperature heat storage device releases heat, the regenerative heater and the low-temperature heat storage device are connected in parallel to heat the feed water, namely, one part of the feed water enters the low-temperature heat storage device, the other part of the feed water enters the regenerative heater, and the heated feed water is jointly used as the feed water of the boiler system and the high-temperature heat storage device.
8. The system of claim 4, wherein during heat storage, high-temperature steam of the boiler system heats low-temperature molten salt from the low-temperature molten salt storage tank in the molten salt/water working medium heat exchanger, cooled condensed water enters a feed water inlet of the boiler system, and the heated high-temperature molten salt enters the high-temperature molten salt storage tank; when heat is released, the high-temperature molten salt discharged from the high-temperature molten salt storage tank heats water supply in the molten salt/water working medium heat exchanger to generate high-temperature steam, the high-temperature steam enters the steam turbine system or enters the boiler system for further heating and then enters the steam turbine system, and the cooled low-temperature molten salt enters the low-temperature molten salt storage tank.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114704815A (en) * | 2022-04-08 | 2022-07-05 | 西安热工研究院有限公司 | Vapor heat storage system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114704815A (en) * | 2022-04-08 | 2022-07-05 | 西安热工研究院有限公司 | Vapor heat storage system |
| CN114704815B (en) * | 2022-04-08 | 2023-11-07 | 西安热工研究院有限公司 | Steam heat storage system |
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