Peak shaving system combining steam turbine cooling water heating and heat storage electric boiler

Abstract

The utility model discloses a steam turbine cooling water heating and heat storage electric boiler combined peak shaving system which comprises a steam turbine generator, a condenser, a steam-water heat exchanger and a heat storage electric boiler, a steam exhaust port of the steam turbine generator is connected with the condenser, the condenser is connected to the steam-water heat exchanger through a first cooling water return pipeline, and the steam turbine generator is connected with the steam-water heat exchanger through a second cooling water return pipeline. The steam-water heat exchanger is connected with the heat storage electric boiler and is used for heating cooling water; the heat storage electric boiler is connected with the steam-turbine generator, the steam-turbine generator is used for generating electric energy for heat storage, the heat storage electric boiler is used for heating cooling water in the steam-water heat exchanger, and the heated cooling water is conveyed to the heat exchange station, so that power supply output of a power plant to a power grid is reduced, and the purpose of peak regulation is achieved. And traditional industrial steam auxiliary heating is replaced, the heat supply cost is reduced, and the heat supply quality is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of power peak shaving, specifically a peak shaving system that combines steam turbine cooling water heating with a thermal storage electric boiler. Background Technology

[0002] With the rapid development of renewable energy, the demand for flexible regulation capabilities in the power system is increasing. Traditional large-scale coal-fired power units have limited peak-shaving capacity, making it difficult to meet the deep peak-shaving needs of the power grid. Simultaneously, with the increase in urban heating areas, the winter heating pressure on traditional large-scale coal-fired power units is increasing daily. Utilizing the heat recovery from the cooling water of extraction-condensing steam turbine generator units for heating may be insufficient to meet heating demands. To ensure heating quality, thermal power plants use industrial steam as auxiliary heating to raise the temperature of the turbine cooling water. However, because the production cost and selling price of industrial steam are higher than the heating price, the cost of using industrial steam to auxiliary heat the cooling water is high, resulting in lower heating revenue compared to selling the same amount of steam to industrial users. Utility Model Content

[0003] In order to overcome the shortcomings of the existing technology, the purpose of this utility model is to provide a peak-shaving system that combines steam turbine cooling water heating with thermal storage electric boiler, aiming to solve the problems of insufficient peak-shaving capacity and unstable heating quality of the power system.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows: a peak-shaving system combining steam turbine cooling water heating and thermal storage electric boiler, comprising a steam turbine generator, a condenser, a steam-water heat exchanger, and a thermal storage electric boiler. The exhaust port of the steam turbine generator is connected to the condenser. The condenser is connected to the steam-water heat exchanger through a first cooling water return pipe. The steam-water heat exchanger is connected to the thermal storage electric boiler to heat the cooling water. The thermal storage electric boiler is connected to the steam turbine generator.

[0005] Preferably, it also includes a heat exchange station, wherein the steam-water heat exchanger is connected to the heat exchange station through a hot water pipeline to deliver heated cooling water to the heat exchange station, and the heat exchange station is also connected to residential heating users.

[0006] Preferably, the heat exchange station is connected to the condenser via a first cooling water inlet pipe, and the cooled water after heat exchange is delivered to the condenser.

[0007] Preferably, it also includes a cooling tower, and the condenser is also connected to the cooling tower through a second cooling water return pipe to return the heat-absorbing cooling water to the cooling tower for cooling.

[0008] Preferably, the cooling tower is also connected to the condenser via a second cooling water inlet pipe to deliver the cooled water to the condenser.

[0009] Preferably, the first cooling water return pipe, the first cooling water inlet pipe, the second cooling water return pipe, and the second cooling water inlet pipe are all equipped with valves.

[0010] Preferably, the steam outlet of the thermal storage electric boiler is divided into two steam pipelines: one is connected to the steam-side inlet of the steam-water heat exchanger via a valve, and the other is connected to the inlet of the industrial steam user via a valve.

[0011] Preferably, the system also includes a boiler, which is connected to a steam turbine generator via a pipeline. The boiler heats the high-temperature, high-pressure steam and then delivers it to the steam turbine generator, which uses the high-temperature, high-pressure steam to generate electricity.

[0012] Preferably, it also includes a desuperheater and pressure reducer, the steam turbine generator being connected to the desuperheater and pressure reducer via a pipeline, and the desuperheater and pressure reducer being connected to an industrial steam user.

[0013] Preferably, it also includes electrical equipment, which is connected to a steam turbine generator via pipeline to deliver demineralized water to a thermal storage electric boiler.

[0014] The beneficial effects of this invention are as follows: It utilizes solid thermal storage technology for peak shaving and heating. During off-peak hours, the thermal storage boiler stores heat and produces steam simultaneously, while also heating the turbine cooling water. During peak hours, it releases steam without storing heat, using stored heat to supplement heating. This achieves intelligent thermal-electric decoupling of the unit, resulting in a wide range of deep peak shaving and high power output at peak times. This solves the peak-valley problem of power generation, reduces dependence on and consumption of external industrial steam, lowers costs, and ensures heating quality. Furthermore, during the beginning and end of the heating season when temperatures are not low and residential heating demand decreases, and during the non-heating season, surplus steam produced by the industrial boiler can be sold to industrial users, achieving year-round peak shaving for power generation and increasing other revenue streams. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the peak-shaving system combining steam turbine cooling water heating and thermal storage electric boiler of this utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the thermal storage electric boiler of this utility model;

[0017] In the diagram: 1. Steam turbine generator; 2. Condenser; 3. Steam-water heat exchanger; 4. Thermal storage electric boiler; 4-1. Steam boiler; 4-2. Heat storage body; 4-3. Heating wire; 4-4. Circulating fan; 4-5. Cool air; 4-6. Hot air; 4-7. Steam; 4-8. Steam condensate; 5. Heat exchange station; 6. Cooling tower; 7. Boiler; 8. Desuperheater and pressure reducer; 9. Electrical equipment; 10. First cooling water return pipe; 11. First cooling water inlet pipe; 12. Second cooling water return pipe; 13. Second cooling water inlet pipe; 14. Hot water pipeline. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] See Figure 1 A peak-shaving system combining steam turbine cooling water heating and thermal storage electric boiler includes a steam turbine generator 1, a condenser 2, a steam-water heat exchanger 3, and a thermal storage electric boiler 4. The exhaust port of the steam turbine generator 1 is connected to the condenser 2. The condenser 2 is connected to the steam-water heat exchanger 3 through a first cooling water return pipe 10. The steam-water heat exchanger 3 is connected to the thermal storage electric boiler 4 to heat the cooling water. The thermal storage electric boiler 4 is connected to the steam turbine generator 1.

[0020] The exhaust port of the steam turbine generator 1 is connected to the condenser 2, which condenses the steam discharged from the steam turbine generator 1 to form cooling water. The steam-water heat exchanger 3 is connected to the thermal storage electric boiler 4, which uses the steam heat energy generated by the thermal storage electric boiler to heat the cooling water from the condenser 2. The heated cooling water can then be used for heating. In this embodiment, the thermal storage electric boiler 4 adopts the following... Figure 2 The existing structure shown converts electrical energy into thermal energy in the thermal storage boiler 4, stores the thermal energy through the thermal storage body 4-2, and releases the thermal energy stored in the thermal storage body in the form of steam.

[0021] The working principle of the thermal storage electric boiler 4 is to use electricity as energy. The heating wire 4-3 is started by electricity, and the thermal storage body 4-2 is heated by electric heating. The thermal storage body 4-2 stores the thermal energy. The circulating fan 4-4 provides the heat transfer medium. When the thermal storage body 4-2 is a solid thermal storage body, air is used as the heat transfer medium to flow through the high-temperature solid thermal storage body and absorb heat. The high-temperature heat transfer medium enters the steam boiler 4-1 and exchanges heat with the feed water, heating the water to the boiling point and evaporating it into steam 4-7. When the thermal storage body is a water thermal storage body, the stored high-temperature water enters the steam generator through the circulating pump. In the pressure reducing or flash evaporation device, the high-temperature water rapidly vaporizes due to the pressure reduction and generates steam.

[0022] It also includes a heat exchange station 5, where a steam-water heat exchanger 3 is connected to the heat exchange station 5 via a hot water pipeline 14 to deliver heated cooling water to the heat exchange station 5. The heat exchange station 5 is also connected to residential heating users.

[0023] As an intermediate link in the heating system, heat exchange station 5 effectively delivers heated cooling water to users, meeting the heating needs of residents.

[0024] The thermal storage electric boiler 4 uses the steam turbine generator 1 to generate electricity for thermal storage. At the same time, the thermal storage electric boiler 4 is used to heat the cooling water in the steam-water heat exchanger 3. After heating, the cooling water is transported to the heat exchange station 5, thereby reducing the power output of the power plant to the grid, achieving the purpose of peak regulation, and replacing traditional industrial steam auxiliary heating, reducing heating costs and ensuring heating quality.

[0025] The heat exchange station 5 is connected to the condenser 2 through the first cooling water inlet pipe 11, and the cooling water after heat exchange is transported to the condenser 2 to realize the recycling of cooling water.

[0026] It also includes a cooling tower 6. The condenser 2 is also connected to the cooling tower 6 through a second cooling water return pipe 12 to return the heat-absorbing cooling water to the cooling tower 6 for cooling. The cooling tower 6 is also connected to the condenser 2 through a second cooling water inlet pipe 13 to transport the cooled water to the condenser 2.

[0027] After the high-temperature cooling circulating water is cooled down by the cooling tower 6, it can be reused.

[0028] Valves are installed in the first cooling water return pipe 10, the first cooling water inlet pipe 11, the second cooling water return pipe 12, and the second cooling water inlet pipe 13.

[0029] The cooling water circuit can be flexibly switched by opening and closing the valve. During the winter heating season, the cooling water is used for heating. The cooling water returning from the first cooling water return pipe 10 enters the steam-water heat exchanger 3 for heating. The steam heat source of the steam-water heat exchanger 3 comes from the thermal storage electric boiler 4, and is then supplied to the heat exchange station 5 through the heat network pipeline. The cooling water after heat exchange in the first cooling water inlet pipe 11 is then transported to the condenser 2, which can also cool the steam turbine generator 1.

[0030] During the non-heating season, cooling tower 6 is activated to cool the cooling water. The cooling water returning from the second cooling water return pipe 12 enters the cooling tower 6 for cooling. The cooled water, after being cooled by the second cooling water inlet pipe 13, is then transported to the condenser 2. The cooled water returns to the condenser 2 to further condense the steam discharged from the turbine generator 1.

[0031] The steam outlet of the thermal storage electric boiler 4 is divided into two steam pipelines. One pipeline is connected to the steam side inlet of the steam-water heat exchanger 3 through a valve, and the other pipeline is connected to the inlet of the industrial steam user through a valve.

[0032] The steam heat energy of thermal storage electric boiler 4 is distributed for multiple purposes, with priority given to heating during the heating season and directly supplied to industrial steam users during the non-heating season.

[0033] It also includes a boiler 7, which is connected to a steam turbine generator 1 through a pipeline. The high-temperature and high-pressure steam heated by the boiler 7 is transported to the steam turbine generator 1, and the steam turbine generator 1 uses the high-temperature and high-pressure steam to generate electricity.

[0034] It also includes a desuperheater and pressure reducer 8. The steam turbine generator 1 is connected to the desuperheater and pressure reducer 8 via pipeline, and the desuperheater and pressure reducer 8 is connected to the industrial steam user. The desuperheater and pressure reducer 8 de-heats and reduces the pressure of the high-temperature and high-pressure steam generated by the steam turbine generator before it is delivered to the industrial steam user.

[0035] It also includes electrical equipment 9, which is connected to the steam turbine generator 1 through pipelines to transport demineralized water to the thermal storage boiler 4. The demineralized water is then transported to the thermal storage boiler 4 to replenish the boiler.

[0036] Working principle:

[0037] During off-peak hours, the thermal storage boiler 4 simultaneously stores and releases heat. The electricity generated by the turbine generator 1 drives the thermal storage boiler 4 to store heat, converting electrical energy into high-temperature thermal energy stored in the storage medium. Simultaneously, the stored heat energy is released as steam. During this storage process, the thermal storage boiler 4 releases a portion of the steam, which is then used to assist in heating the turbine cooling water for heating. During peak hours, the thermal storage boiler 4 releases only the released steam, using it to assist in heating the turbine cooling water for heating. This achieves intelligent thermal-electric decoupling of the unit, resulting in a wide range of deep peak shaving and high peak power output. This solves the peak-valley power generation problem, reduces dependence on and consumption of external industrial steam, lowers costs, and ensures heating quality. Furthermore, during the beginning and end of the heating season when temperatures are not low and residential heating demand decreases, and during the non-heating season, surplus steam produced by the thermal storage boiler 4 can be sold to industrial steam users, achieving year-round peak shaving for power generation and increasing other revenue streams.

[0038] Cooling water circuit control: In winter heating mode, the circuit valve of cooling tower 6 is closed, and cooling water enters the steam-water heat exchanger 3 through the first cooling water return pipe 10. After being heated by steam provided by the thermal storage electric boiler 4, it is delivered to the heat exchange station 5 to provide heating for residents. The cooled water after heat exchange returns to the condenser 2 through the first cooling water inlet pipe 11, and can also cool the steam turbine generator 1. In non-heating season mode, the circuit valve of steam-water heat exchanger 3 is closed, and cooling water enters the cooling tower 6 through the second cooling water return pipe 12 for cooling. The cooled water returns to the condenser 2 to further condense the steam discharged from the steam turbine generator 1.

[0039] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A peak shaving system for a steam power plant combined with a hot water storage electric boiler, characterized in that: The utility model relates to a power generation system, which comprises a steam turbine generator, a condenser, a water-steam heat exchanger and a thermal storage electric boiler, wherein the steam turbine generator is connected with the condenser, the condenser is connected with the water-steam heat exchanger through a first cooling water return pipeline, the water-steam heat exchanger is connected with the thermal storage electric boiler, and the cooling water is heated.

2. The peak shaving system of claim 1, wherein the steam engine cooling water heating and thermal storage electric boiler combination is characterized by: The utility model further comprises a heat exchange station, and the water-steam heat exchanger is connected with the heat exchange station through a hot water pipeline to deliver the heated cooling water to the heat exchange station.

3. The peak shaving system of claim 2, wherein the steam engine cooling water heating and thermal storage electric boiler combination is characterized by: The heat exchange station is connected with the condenser through a first cooling water inlet pipeline to deliver the heat-exchanged cooling water to the condenser, and the heat exchange station is further connected with a residential heating user.

4. The peak shaving system in combination with the electric boiler of the steam engine cooling water heating and storage according to claim 1, characterized in that: The utility model further comprises a cooling tower, and the condenser is further connected with the cooling tower through a second cooling water return pipeline to return the heat-absorbed cooling water to the cooling tower for cooling.

5. The peak shaving system of claim 4, wherein the steam engine cooling water heating and thermal storage electric boiler combination is characterized by: The cooling tower is further connected with the condenser through a second cooling water inlet pipeline to deliver the cooled cooling water to the condenser.

6. The peak shaving system in combination with the electric boiler of the steam engine cooling water heating and storage according to any one of claims 1-5, characterized in that: The first cooling water return pipeline, the first cooling water inlet pipeline, the second cooling water return pipeline and the second cooling water inlet pipeline are all provided with valves.

7. The peak shaving system in combination with the electric boiler of the steam engine cooling water heating and storage according to claim 1, characterized in that: The steam outlet of the thermal storage electric boiler is divided into two steam pipelines, one of which is connected with the steam side inlet of the water-steam heat exchanger through a valve, and the other of which is connected with the inlet of an industrial steam user through a valve.

8. The peak shaving system in combination with the electric boiler of the steam engine cooling water heating and storage according to claim 1, characterized in that: The utility model further comprises a boiler, which is connected with the steam turbine generator through a pipeline to deliver the high-temperature and high-pressure steam heated by the boiler to the steam turbine generator, and the steam turbine generator generates electricity by using the high-temperature and high-pressure steam.

9. The peak shaving system in combination with the electric boiler of the steam engine cooling water heating and storage according to claim 1, characterized in that: The utility model further comprises a desuperheater, and the steam turbine generator is connected with the desuperheater through a pipeline, and the desuperheater is connected with an industrial steam user.

10. The peak shaving system in combination with the electric boiler of the steam engine cooling water heating and storage according to claim 1, characterized in that: The utility model further comprises an electric device, which is connected with the steam turbine generator through a pipeline to deliver the desalted water to the thermal storage electric boiler.

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