CN215170237U - Flexible peak shaving system of thermal power plant based on heat storage - Google Patents
Flexible peak shaving system of thermal power plant based on heat storage Download PDFInfo
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- CN215170237U CN215170237U CN202121154638.2U CN202121154638U CN215170237U CN 215170237 U CN215170237 U CN 215170237U CN 202121154638 U CN202121154638 U CN 202121154638U CN 215170237 U CN215170237 U CN 215170237U
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Abstract
The invention relates to a heat-storage-based flexible peak regulation system of a thermal power plant, which comprises a low-temperature storage tank, a high-temperature storage tank, a molten salt/high-temperature steam heat exchanger, a steam condenser, a molten salt/water heat exchanger, a boiler system and a steam turbine power generation system, wherein the low-temperature storage tank is connected with the high-temperature storage tank; during heat storage, high-temperature steam generated by the boiler system enters the molten salt/high-temperature steam heat exchanger to heat molten salt, the heated molten salt enters the high-temperature storage tank, the cooled steam enters the steam condenser to be condensed into water, and the condensed water enters the molten salt/water heat exchanger to heat low-temperature molten salt coming out of the low-temperature storage tank; when heat is released, feed water from a steam turbine power generation system enters a boiler system after entering a molten salt/water heat exchanger for heating, and low-temperature steam from the boiler system enters a molten salt/high-temperature steam heat exchanger for heating to form high-temperature steam; the system improves the boiler heat load of the thermal power system when the power generation load is low, and simultaneously improves the response capability when the power generation load is increased.
Description
Technical Field
The utility model relates to a thermal power plant's peak shaving especially relates to a nimble peak shaving system of thermal power plant based on heat-retaining.
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 main power supply source in China, and 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 fluctuation and randomness of high-proportion wind power and photovoltaic power generation can put higher requirements on the flexibility peak shaving of the power system, and meanwhile, the problems of low inertia and safety and stability of the system caused by grid connection of power electronic devices of the power system can cause the power system to pay higher cost for consuming high-proportion renewable energy resources. At present, the traditional thermal power generation still occupies the main share and is a foundation for the reliability of a power system, so the market demand for flexibility modification of a thermal power plant is continuously expanded.
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 in the nimble problem that exists of reforming transform of thermal power plant above, provided a thermal power plant's nimble peak shaving system and method based on the heat-retaining, reduced the heat-retaining cost, boiler heat load and stability when improving the low electric load of power plant improve heat utilization efficiency, promote quick climbing of unit and open the ability that stops fast. The specific scheme of the invention is as follows:
a heat-storage-based flexible peak regulation system of a thermal power plant is characterized by comprising a low-temperature storage tank, a high-temperature storage tank, a molten salt/high-temperature steam heat exchanger, a steam condenser, a molten salt/water heat exchanger, a boiler system and a steam turbine power generation system.
When the system stores heat, the outlet of the low-temperature storage tank is connected with the fused salt side low-temperature end interface of the fused salt/water heat exchanger, the fused salt side high-temperature end interface of the fused salt/water heat exchanger is connected with the fused salt side low-temperature end interface of the fused salt/high-temperature steam heat exchanger, and the fused salt side high-temperature end interface of the fused salt/high-temperature steam heat exchanger is connected with the inlet of the high-temperature storage tank; a high-temperature steam outlet of the boiler system is connected with a steam-side high-temperature end interface of the fused salt/high-temperature steam heat exchanger, a steam-side low-temperature end interface of the fused salt/high-temperature steam heat exchanger is connected with a steam inlet of the steam condenser, a condensed water outlet of the steam condenser is connected with a water-side high-temperature end interface of the fused salt/water heat exchanger, and a water-side low-temperature end interface of the fused salt/water heat exchanger is connected with the boiler system; and a cooling water inlet of the steam condenser is connected with a water supply outlet of the steam turbine power generation system.
When the system releases heat, the outlet of the high-temperature storage tank is connected with the interface of the molten salt side high-temperature end of the molten salt/high-temperature steam heat exchanger, the interface of the molten salt side low-temperature end of the molten salt/high-temperature steam heat exchanger is connected with the interface of the molten salt side high-temperature end of the molten salt/water heat exchanger, and the interface of the molten salt side low-temperature end of the molten salt/water heat exchanger is connected with the inlet of the low-temperature storage tank; the system comprises a steam turbine power generation system, a molten salt/water heat exchanger, a boiler system, a saturated steam outlet or a low-temperature superheated steam outlet of the boiler system, a steam side low-temperature end interface of the molten salt/water heat exchanger, a steam side high-temperature end of the molten salt/high-temperature steam heat exchanger, and a steam side low-temperature end interface of the molten salt/high-temperature steam heat exchanger.
The specific working process is as follows:
when the power plant is in a low electric load, in order to keep the combustion stability and the high efficiency of the boiler, the load of the boiler is larger than the heat load required by the steam turbine, and the surplus heat of the boiler is stored. High-temperature steam generated by the boiler system enters the molten salt/high-temperature steam heat exchanger to be used for heating molten salt, and the heated high-temperature molten salt enters the high-temperature storage tank to be stored; the high-temperature steam cooled by the molten salt/high-temperature steam heat exchanger enters the steam condenser, cooling water required by the steam condenser is feed water of the steam turbine power generation system, and the high-temperature steam is cooled into high-temperature condensed water; the high-temperature condensed water enters the molten salt/water heat exchanger to heat the low-temperature molten salt coming out of the low-temperature storage tank, and the cooled low-temperature condensed water enters the boiler system to be heated again, so that the heat load and the stability of the boiler system are improved;
when the power plant needs to improve the electric load, the heat originally stored in the molten salt is released, and the power of the steam turbine is quickly improved. High-temperature molten salt from the high-temperature storage tank enters the molten salt/high-temperature steam heat exchanger to heat low-temperature superheated steam or saturated steam from the boiler system, and the heated high-temperature steam enters the boiler system or directly enters the steam turbine power generation system to improve electric power output; and molten salt from the molten salt/high-temperature steam heat exchanger enters the molten salt/water heat exchanger to be used for heating feed water from the steam turbine power generation system, and the heated feed water enters the boiler system to be further heated.
Preferably, the steam condenser is a hybrid heat exchanger, i.e. the feed water from the turbine power generation system is directly mixed with the water vapor from the molten salt/high temperature steam heat exchanger in the steam condenser to form liquid water. The hybrid heat exchanger has the advantages of high heat exchange efficiency, less required materials and low cost.
Further, low-temperature condensed water from the molten salt/water heat exchanger enters the boiler system in the heat storage process and is mixed with feed water at an inlet or an outlet of an economizer in the boiler system; in the heat release process, the feed water is heated by the molten salt/water heat exchanger and then becomes saturated water to enter a steam drum in the boiler system, and steam is rapidly generated.
Preferably, the flexible peak regulation method for the thermal power plant further comprises an electric heater, and in the heat storage process, the high-temperature molten salt coming out of the molten salt/high-temperature steam heat exchanger is further heated by the electric heater and then enters the high-temperature storage tank for storage.
Preferably, when storing heat, the water side low temperature end interface of the molten salt/water heat exchanger is connected with a feed water inlet of the boiler system; when releasing heat, the water side high temperature end interface of the molten salt/water heat exchanger is connected with a drum feed water inlet of the boiler system.
Preferably, the system further comprises a condensed water circulating pump, an inlet of the condensed water circulating pump is connected with a condensed water outlet of the steam condenser, an outlet of the condensed water circulating pump is connected with a water-side low-temperature end interface of the molten salt/water heat exchanger, and the condensed water circulating pump provides a power pressure head required by the condensed water to reenter the boiler system.
The steam turbine power generation system in the utility model is a system for generating power by applying work by using high-temperature and high-pressure steam, and mainly comprises a steam turbine, a condenser, a steam extraction heat regenerator, a water feeding pump and the like; the boiler system is a device for heating feed water to generate high-temperature steam by using fuel combustion, and comprises a water-cooled wall, a steam drum, an economizer, a superheater, a reheater and the like; the molten salt/water heat exchanger is characterized in that working media on the cold side and the hot side of the heat exchanger are molten salt and water, and heat is transferred from the molten salt to the water or from the water to the molten salt; the molten salt/high-temperature steam heat exchanger is characterized in that working media on the cold side and the hot side of the heat exchanger are molten salt and water vapor, and heat is transferred from the molten salt to the water vapor or from the water vapor to the molten salt; the steam condenser is a heat exchanger for condensing superheated steam or saturated steam into liquid water.
The utility model discloses utilize heat-retaining technique to improve the boiler system heat load when the low electric load of power plant, improve the combustion stability and the efficiency of boiler system, the fused salt heat-retaining difference in temperature is big, and heat-retaining density is high, reduces the heat-retaining cost, carries out the energy storage through utilizing electric heater with millet electricity simultaneously; when the power plant electrical load increases, the power plant load-up rate can be rapidly increased by heat release. Through storing hot process, the power plant can carry out the flexibility peak shaving according to the electric wire netting demand to guarantee higher system efficiency.
Drawings
FIG. 1 is a schematic view of specific example 1;
FIG. 2 is a schematic view of embodiment 2;
FIG. 3 is a schematic diagram of embodiment 3.
In the figure: 1-high temperature storage tank; 2-a low-temperature storage tank; 3-molten salt/water heat exchanger; 4-a condensate circulating pump; 5-a steam condenser; 6-molten salt/high temperature steam heat exchanger; 7-a boiler system; 8-a steam turbine power generation system; 9-electric heater.
Detailed Description
Example 1
The embodiment is a heat storage process of the flexible peak shaving system of the thermal power plant, and as shown in fig. 1, the heat storage process comprises a high-temperature storage tank 1, a low-temperature storage tank 2, a molten salt/water heat exchanger 3, a condensed water circulating pump 4, a steam condenser 5, a molten salt/high-temperature steam heat exchanger 6, a boiler system 7 and a steam turbine power generation system 8. An outlet of the low-temperature storage tank 2 is connected with a fused salt side low-temperature end interface of the fused salt/water heat exchanger 3, a fused salt side high-temperature end interface of the fused salt/water heat exchanger 3 is connected with a fused salt side low-temperature end interface of the fused salt/high-temperature steam heat exchanger 6, and a fused salt side high-temperature end interface of the fused salt/high-temperature steam heat exchanger 6 is connected with an inlet of the high-temperature storage tank 1; a high-temperature steam outlet of the boiler system 7 is connected with a steam-side high-temperature end interface of the fused salt/high-temperature steam heat exchanger 6, a steam-side low-temperature end interface of the fused salt/high-temperature steam heat exchanger 6 is connected with a steam inlet of the steam condenser 5, a condensed water outlet of the steam condenser 5 is connected with an inlet of a condensed water circulating pump 4, an outlet of the condensed water circulating pump 4 is connected with a water-side high-temperature end interface of the fused salt/water heat exchanger 3, and a water-side low-temperature end interface of the fused salt/water heat exchanger 3 is connected with a feed water inlet of the boiler system 7; and a cooling water inlet of the steam condenser is connected with a water supply outlet of the steam turbine power generation system.
The low-temperature molten salt from the low-temperature storage tank 2 is heated by condensed water in the molten salt/water heat exchanger 3, the heated molten salt enters the molten salt/high-temperature steam heat exchanger 6 again and is heated by high-temperature steam from the boiler system 7, and finally the molten salt enters the high-temperature storage tank 1 for storage. And a part of high-temperature steam from the boiler system 7 enters the molten salt/high-temperature steam heat exchanger 6 to heat molten salt, and then enters the steam condenser 5. The steam condenser 5 is a hybrid heat exchanger, and the cooling water is feed water from the steam turbine power generation system 8 and is mixed with steam to form condensed water. The condensed water enters the feed water inlet of the boiler system 7 again after being pressurized by the condensed water circulating pump 4, and is reheated and gasified in the boiler system to form high-temperature steam, so that the heat load of the boiler system 7 is improved, and surplus heat is stored in high-temperature molten salt. A part of high-temperature steam generated by the boiler system 7 enters a steam turbine power generation system 8 to do work.
Example 2
On the basis of embodiment 1, an electric heater 9 is added, as shown in fig. 2. When the system stores heat, the inlet of the electric heater 9 is connected with the interface of the fused salt side high-temperature end of the fused salt/high-temperature steam heat exchanger 6, and the outlet of the electric heater 9 is connected with the inlet of the high-temperature storage tank 1. The molten salt (about 500 ℃) heated by the molten salt/high-temperature steam heat exchanger 6 enters the electric heater 9 to further increase the temperature (about 550 ℃) and finally enters the high-temperature storage tank 1 for storage. The electric heater 9 can convert electric energy into heat energy for efficient storage by using low-price valley electricity in the power grid, and when the load of the system is required to be lifted, the heat energy is converted into electric energy for release.
Example 3
The embodiment is a heat release process of the flexible peak shaving system of the thermal power plant, and is shown in fig. 3. The outlet of the high-temperature storage tank 1 is connected with the fused salt side high-temperature end interface of the fused salt/high-temperature steam heat exchanger 6, the fused salt side low-temperature end interface of the fused salt/high-temperature steam heat exchanger 6 is connected with the fused salt side high-temperature end interface of the fused salt/water heat exchanger 3, and the fused salt side low-temperature end interface of the fused salt/water heat exchanger 3 is connected with the inlet of the low-temperature storage tank 2. The water supply outlet of the steam turbine power generation system 8 is connected with the water side low-temperature end interface of the fused salt/water heat exchanger 3, the water side high-temperature end interface of the fused salt/water heat exchanger 3 is connected with the drum water supply inlet of the boiler system 7, the drum saturated steam outlet of the boiler system 7 is connected with the steam side low-temperature end interface of the fused salt/high-temperature steam heat exchanger 6, and the steam side high-temperature end of the fused salt/high-temperature steam heat exchanger 6 is connected with the steam inlet of the steam turbine power generation system 8.
The specific working process is as follows: part of feed water from the steam turbine power generation system 8 enters the molten salt/water heat exchanger 3, is heated into saturated water by molten salt, enters a steam drum in the boiler system 7 to generate saturated steam, the saturated steam enters the molten salt/high-temperature steam heat exchanger 6 to be continuously heated into high-temperature steam, and the high-temperature steam directly enters the steam turbine power generation system 8 to do work. The high-temperature molten salt sequentially enters the molten salt/high-temperature steam heat exchanger 6 and the molten salt/water heat exchanger 3 from the high-temperature storage tank 1, is cooled by water media, and then enters the low-temperature storage tank 2.
The above-mentioned embodiment 1, embodiment 2 and embodiment 3 are only some embodiments of the present invention, and it is easily understood by those skilled in the art that the protection 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. A thermal power plant flexible peak regulation system based on heat storage is characterized by comprising a low-temperature storage tank, a high-temperature storage tank, a molten salt/high-temperature steam heat exchanger, a steam condenser, a molten salt/water heat exchanger, a boiler system and a steam turbine power generation system;
when the power plant stores heat, the outlet of the low-temperature storage tank is connected with the fused salt side low-temperature end interface of the fused salt/water heat exchanger, the fused salt side high-temperature end interface of the fused salt/water heat exchanger is connected with the fused salt side low-temperature end interface of the fused salt/high-temperature steam heat exchanger, and the fused salt side high-temperature end interface of the fused salt/high-temperature steam heat exchanger is connected with the inlet of the high-temperature storage tank; a high-temperature steam outlet of the boiler system is connected with a steam-side high-temperature end interface of the fused salt/high-temperature steam heat exchanger, a steam-side low-temperature end interface of the fused salt/high-temperature steam heat exchanger is connected with a steam inlet of the steam condenser, a condensed water outlet of the steam condenser is connected with a water-side high-temperature end interface of the fused salt/water heat exchanger, and a water-side low-temperature end interface of the fused salt/water heat exchanger is connected with the boiler system; a cooling water inlet of the steam condenser is connected with a water supply outlet of the steam turbine power generation system;
when the power plant releases heat, the outlet of the high-temperature storage tank is connected with the fused salt side high-temperature end interface of the fused salt/high-temperature steam heat exchanger, the fused salt side low-temperature end interface of the fused salt/high-temperature steam heat exchanger is connected with the fused salt side high-temperature end interface of the fused salt/water heat exchanger, and the fused salt side low-temperature end interface of the fused salt/water heat exchanger is connected with the inlet of the low-temperature storage tank; the system comprises a steam turbine power generation system, a molten salt/water heat exchanger, a boiler system, a saturated steam outlet or a low-temperature superheated steam outlet of the boiler system, a steam side low-temperature end interface of the molten salt/water heat exchanger, a steam side high-temperature end of the molten salt/high-temperature steam heat exchanger, and a steam side low-temperature end interface of the molten salt/high-temperature steam heat exchanger.
2. A thermal-storage-based thermal power plant flexible peak shaver system as set forth in claim 1, wherein the water side low temperature end interface of said molten salt/water heat exchanger is connected to the feed water inlet of said boiler system when storing heat; when releasing heat, the water side high temperature end interface of the molten salt/water heat exchanger is connected with a drum feed water inlet of the boiler system.
3. The thermal-storage-based thermal power plant flexible peak shaving system according to claim 2, characterized by further comprising a condensate circulating pump, wherein an inlet of the condensate circulating pump is connected with a condensate outlet of the steam condenser, an outlet of the condensate circulating pump is connected with a water-side low-temperature end interface of the molten salt/water heat exchanger, and the condensate circulating pump provides a power head required for condensate to enter the boiler system.
4. The thermal storage based thermal power plant flexible peak regulation system according to any one of claims 1, 2 or 3, characterized by further comprising an electric heater, wherein when storing heat, an inlet of the electric heater is connected with the interface of the molten salt side high temperature end of the molten salt/high temperature steam heat exchanger, and an outlet of the electric heater is connected with an inlet of the high temperature storage tank.
5. The heat-storage-based flexible peak shaving system for a thermal power plant as claimed in claim 1, wherein when heat storage is required, high-temperature steam generated by the boiler system enters the molten salt/high-temperature steam heat exchanger for heating molten salt, and the heated high-temperature molten salt enters the high-temperature storage tank for storage; the high-temperature steam cooled by the molten salt/high-temperature steam heat exchanger enters the steam condenser, cooling water required by the steam condenser is feed water of the steam turbine power generation system, and the high-temperature steam is cooled into high-temperature condensed water; the high-temperature condensed water enters the molten salt/water heat exchanger to heat the low-temperature molten salt coming out of the low-temperature storage tank, and the cooled low-temperature condensed water enters the boiler system to be heated again, so that the heat load of the boiler system is improved;
when heat release is needed, high-temperature molten salt from the high-temperature storage tank enters the molten salt/high-temperature steam heat exchanger to heat low-temperature superheated steam or saturated steam from the boiler system, and the heated high-temperature steam enters the boiler system or directly enters the steam turbine power generation system to improve electric power output; and molten salt from the molten salt/high-temperature steam heat exchanger enters the molten salt/water heat exchanger to be used for heating feed water from the steam turbine power generation system, and the heated feed water enters the boiler system to be further heated.
6. A thermal storage based thermal power plant peak shaving system according to any one of claims 1, 2 or 3, characterized in that the steam condenser is a hybrid heat exchanger, i.e. the feed water from the turbine power generation system is directly mixed in the steam condenser with the water vapor from the molten salt/high temperature steam heat exchanger to form liquid water.
7. The heat-storage-based thermal power plant flexible peak shaving system according to claim 1, wherein low-temperature condensed water from the molten salt/water heat exchanger during heat storage enters the boiler system and is mixed with economizer inlet or economizer outlet feed water in the boiler system.
8. The heat storage based thermal power plant flexible peak shaving system according to claim 1, characterized in that during heat release, the feed water is heated by the molten salt/water heat exchanger and then becomes saturated water to enter a steam drum in the boiler system.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114893265A (en) * | 2022-04-06 | 2022-08-12 | 上海申能新动力储能研发有限公司 | Heavy type gas-steam combined cycle power generation system with heat storage and energy storage module |
| CN115405383A (en) * | 2021-05-27 | 2022-11-29 | 杭州明晟新能源科技有限公司 | Heat storage-based flexible peak regulation system and method for thermal power plant |
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2021
- 2021-05-27 CN CN202121154638.2U patent/CN215170237U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115405383A (en) * | 2021-05-27 | 2022-11-29 | 杭州明晟新能源科技有限公司 | Heat storage-based flexible peak regulation system and method for thermal power plant |
| CN114893265A (en) * | 2022-04-06 | 2022-08-12 | 上海申能新动力储能研发有限公司 | Heavy type gas-steam combined cycle power generation system with heat storage and energy storage module |
| CN114893265B (en) * | 2022-04-06 | 2024-03-22 | 上海申能新动力储能研发有限公司 | Heavy-duty gas-steam combined cycle power generation system with heat storage and energy storage module |
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