System for applying electric boiler to peak regulation and capacity market of coal-fired heat supply unit

Abstract

The utility model relates to a system for applying an electric boiler to peak regulation and capacity market of a coal-fired heat supply unit. The system comprises a steam turbine generator, a new energy station, a transformer, the electric boiler, a heat supply network heat exchanger, a heat supply network system, a condensed water heat exchanger and a coal-fired unit condensed water system, the electric boiler, the first high-voltage power switch, the second high-voltage power switch, the heat supply network heat exchanger, the first valve, the second valve, the condensation water heat exchanger, the third valve, the fourth valve, the heat supply network system and the steam turbine generator form a coal-fired heat supply unit electric boiler peak regulation operation system which is used for peak regulation of a coal-fired heat supply unit. An electric boiler, a first high-voltage power switch, a second high-voltage power switch, a heat supply network heat exchanger, a first valve, a second valve, a condensation water heat exchanger, a third valve, a fourth valve, a new energy station, a coal-fired unit condensation water system and a steam turbine generator form a coal-fired heat supply unit participation capacity market system which is used for the coal-fired heat supply unit to participate in the capacity market. The peak regulation function of the coal-fired heat supply unit and the capacity market participation function of the coal-fired heat supply unit can be achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of steam turbine application, and in particular relates to a system in which an electric boiler is used for peak regulation and capacity market of a coal-fired heating unit. Background Art

[0002] With the construction of urbanization and environmental protection needs, the construction of large energy bases is also being actively constructed. A large number of new energy sources in large bases are connected to the power grid. Thermal power units, as the main peak-shaving units, need to reduce load when the power grid needs them, especially in the windy season during the heating period.

[0003] However, during the heating period, coal-fired heating units lack strong thermal-electric decoupling capabilities, and the units' deep peak-shaving capabilities and peak capacities are often reduced due to thermal load limitations, making it impossible for coal-fired heating units to obtain maximum benefits in the peak-shaving market and the capacity market.

[0004] By switching the system to achieve the difference in the electric energy utilization and energy output of the boiler, the peak-shaving capacity of the coal-fired heating units in the large energy base can be improved. At the same time, the energy-saving advantages of equivalent substitution are utilized to improve the peak capacity of the coal-fired heating units, so that the units can participate in the capacity market during the heating period and obtain higher returns. System switching at different times and under different demands provides good profit conditions for coal-fired heating units. Therefore, in view of the urgency of the current coal-fired heating units participating in the peak-shaving market and the capacity market, a reliable solution is needed. Utility Model Content

[0005] The utility model aims to provide a system in which an electric boiler is used for peak load regulation and capacity market of a coal-fired heating unit, so as to solve the above-mentioned technical problems.

[0006] The utility model provides a system for peak load regulation and capacity market of coal-fired heating units using electric boilers, including a steam turbine generator, a new energy station, a transformer, an electric boiler, a heat network heat exchanger, a heat network system, a condensate heat exchanger, and a condensate system of a coal-fired unit;

[0007] The steam turbine generator is connected to the transformer through a first high-voltage power switch, the new energy station is connected to the transformer through a second high-voltage power switch, the transformer is connected to the electric boiler, the inlet pipe and outlet pipe of the heat network heat exchanger are respectively provided with a first valve and a second valve, the inlet pipe and outlet pipe of the condensate heat exchanger are respectively provided with a third valve and a fourth valve; the electric boiler is connected to the first valve and the third valve; the heat network heat exchanger is connected to the heat network system; the condensate heat exchanger is connected to the condensate system of the coal-fired unit;

[0008] The electric boiler, the first high-voltage power switch, the second high-voltage power switch, the heat network heat exchanger, the first valve, the second valve, the condensate heat exchanger, the third valve, the fourth valve, the heat network system, and the steam turbine generator constitute a peak-shaving operation system for the electric boiler of the coal-fired heating unit;

[0009] The coal-fired heating unit electric boiler peak-shaving operation system is used to: close the first high-voltage power switch of the electric boiler, separate the second high-voltage power switch, open the first valve and the second valve between the electric boiler and the heat exchanger of the heat network, close the third valve and the fourth valve between the electric boiler and the condensate heat exchanger, and use the electric boiler to heat or store heat for the heat network system using the power generated by the steam turbine generator to achieve the peak-shaving function of the coal-fired heating unit;

[0010] The electric boiler, the first high-voltage power switch, the second high-voltage power switch, the heat network heat exchanger, the first valve, the second valve, the condensate heat exchanger, the third valve, the fourth valve, the new energy station, the condensate system of the coal-fired unit, and the steam turbine generator constitute a coal-fired heating unit participating in the capacity market system;

[0011] The system for the coal-fired heating unit to participate in the capacity market is used to: close the second high-voltage power switch of the electric boiler, separate the first high-voltage power switch, close the first valve and the second valve between the electric boiler and the heat exchanger of the heat network, close the third valve and the fourth valve between the electric boiler and the condensate heat exchanger, and use the electric boiler to heat the condensate system of the coal-fired unit using the power generation of the new energy plant to replace the condensate extraction system. The replaced extraction steam continues to do work in the steam turbine, so as to realize the function of the coal-fired heating unit to participate in the capacity market.

[0012] Furthermore, the steam turbine generator, new energy station, transformer, electric boiler, heat network heat exchanger, heat network system, condensate heat exchanger, and condensate system of coal-fired units are arranged in a large energy base.

[0013] Through the above scheme, the system using electric boilers for peak load regulation of coal-fired heating units and capacity market has the following technical effects:

[0014] 1) When the new energy green electricity is fully generated, the steam turbine generator needs to reduce the power generation. The cogeneration unit is often unable to achieve deep peak regulation due to thermal load limitations. The above system can achieve deep peak regulation of coal-fired units and meet the unit's external heat supply needs at the same time.

[0015] 2) According to the demand of the capacity market, when the unit needs to reach peak capacity, the green electricity is absorbed by the electric boiler to increase the condensate temperature, replace the unit's steam extraction, increase the output of the steam turbine generator, and realize the peak capacity of the coal-fired heating unit.

[0016] 3) Through flexible and diverse operation modes, three benefits can be achieved under the large energy base: capacity market, peak-shaving market, and heating market.

[0017] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the utility model in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The utility model is a schematic diagram of the structure of the system in which the electric boiler is used for peak load regulation and capacity market of coal-fired heating units.

[0019] Numbers in the figure:

[0020] 1-steam turbine generator; 2-new energy station; 3-transformer; 4-electric boiler; 41-first high-voltage power switch; 42-second high-voltage power switch; 5-heat network heat exchanger; 51-first valve; 52-second valve; 6-heat network system; 7-condensate heat exchanger; 71-third valve; 72-fourth valve; 8-condensate system of coal-fired unit. DETAILED DESCRIPTION

[0021] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0022] Ginseng Figure 1 As shown, this embodiment provides a system in which an electric boiler is used for peak load regulation and capacity market of coal-fired heating units, including a steam turbine generator 1 in a large energy base, a new energy station 2, a transformer 3, an electric boiler 4, a heat network heat exchanger 5, a heat network system 6, a condensate heat exchanger 7, and a condensate system 8 of a coal-fired unit.

[0023] The steam turbine generator 1 is connected to the transformer 3 through the first high-voltage power switch 41, the new energy station 2 is connected to the transformer 3 through the second high-voltage power switch 42, the transformer 3 is connected to the electric boiler 4, the inlet pipe and the outlet pipe of the heat network heat exchanger 5 are respectively provided with a first valve 51 and a second valve 52, the inlet pipe and the outlet pipe of the condensate heat exchanger 7 are respectively provided with a third valve 71 and a fourth valve 72; the electric boiler 4 is connected to the first valve 51 and the third valve 71; the heat network heat exchanger 5 is connected to the heat network system 6; the condensate heat exchanger 7 is connected to the condensate system 8 of the coal-fired unit.

[0024] The electric boiler 4, the first high-voltage power switch 41, the second high-voltage power switch 42, the heat network heat exchanger 5, the first valve 51, the second valve 52, the condensate heat exchanger 7, the third valve 71, the fourth valve 72, the heat network system 6, and the steam turbine generator 1 constitute the peak-shaving operation system of the electric boiler of the coal-fired heating unit.

[0025] The peak-shaving operation system of the electric boiler of the coal-fired heating unit is used to: close the first high-voltage power switch 41 of the electric boiler 4, open the second high-voltage power switch 42, open the first valve 51 and the second valve 52 between the electric boiler 4 and the heat network heat exchanger 5, close the third valve 71 and the fourth valve 72 between the electric boiler 4 and the condensate heat exchanger 7, and use the power generation of the steam turbine generator 1 through the electric boiler 4 to heat or store heat for the heat network system 6, so as to realize the peak-shaving function of the coal-fired heating unit.

[0026] The electric boiler 4, the first high-voltage power switch 41, the second high-voltage power switch 42, the heat network heat exchanger 5, the first valve 51, the second valve 52, the condensate heat exchanger 7, the third valve 71, the fourth valve 72, the new energy station 2, the coal-fired unit condensate system 8, and the steam turbine generator 1 constitute a coal-fired heating unit participating in the capacity market system.

[0027] The system for coal-fired heating units to participate in the capacity market is used to: close the second high-voltage power switch 42 of the electric boiler 4, separate the first high-voltage power switch 41, close the first valve 51 and the second valve 52 between the electric boiler 4 and the heat network heat exchanger 5, close the third valve 71 and the fourth valve 72 between the electric boiler 4 and the condensate heat exchanger 7, and use the electric boiler 4 to heat the condensate system 8 of the coal-fired unit using the power generation of the new energy plant 2 to replace the (original) condensate extraction system. The replaced extraction continues to do work in the turbine 1, so as to realize the function of coal-fired heating units participating in the capacity market.

[0028] The electric boiler is used in the peak load regulation and capacity market system of coal-fired heating units, and has the following technical effects:

[0029] 1) When the new energy green electricity is fully generated, the steam turbine generator needs to reduce the power generation. The cogeneration unit is often unable to achieve deep peak regulation due to thermal load limitations. The above system can achieve deep peak regulation of coal-fired units and meet the unit's external heat supply needs at the same time.

[0030] 2) According to the demand of the capacity market, when the unit needs to reach peak capacity, the green electricity is absorbed by the electric boiler to increase the condensate temperature, replace the unit's steam extraction, increase the output of the steam turbine generator, and realize the peak capacity of the coal-fired heating unit.

[0031] 3) Through flexible and diverse operation modes, three benefits can be achieved under the large energy base: capacity market, peak-shaving market, and heating market.

[0032] For conventional 350MW supercritical units, the 160MW electric boiler can provide 155MW of heating capacity and 161MW of peak-shaving capacity for the unit, increasing the plant's peak capacity by 92MW. The comprehensive annual revenue is expected to be more than 20 million.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as within the protection scope of the present invention.

Claims

1. A system for using electric boilers for peak load regulation and capacity market of coal-fired heating units, characterized in that: It includes a steam turbine generator (1), a new energy station (2), a transformer (3), an electric boiler (4), a heat network heat exchanger (5), a heat network system (6), a condensate heat exchanger (7), and a condensate system of a coal-fired unit (8); The steam turbine generator (1) is connected to the transformer (3) via a first high-voltage power switch (41); the new energy station (2) is connected to the transformer (3) via a second high-voltage power switch (42); the transformer (3) is connected to the electric boiler (4); the inlet pipe and outlet pipe of the heat network heat exchanger (5) are respectively provided with a first valve (51) and a second valve (52); the inlet pipe and outlet pipe of the condensate heat exchanger (7) are respectively provided with a third valve (71) and a fourth valve (72); the electric boiler (4) is connected to the first valve (51) and the third valve (71); the heat network heat exchanger (5) is connected to the heat network system (6); the condensate heat exchanger (7) is connected to the condensate system (8) of the coal-fired unit; The electric boiler (4), the first high-voltage power switch (41), the second high-voltage power switch (42), the heat network heat exchanger (5), the first valve (51), the second valve (52), the condensate heat exchanger (7), the third valve (71), the fourth valve (72), the heat network system (6), and the steam turbine generator (1) constitute a peak-shaving operation system of an electric boiler of a coal-fired heating unit; The coal-fired heating unit electric boiler peak load regulation operation system is used to: close the first high-voltage power switch (41) of the electric boiler (4), open the second high-voltage power switch (42), open the first valve (51) and the second valve (52) between the electric boiler (4) and the heat network heat exchanger (5), close the third valve (71) and the fourth valve (72) between the electric boiler (4) and the condensate heat exchanger (7), and use the power generation of the steam turbine generator (1) through the electric boiler (4) to supply heat or store heat to the heat network system (6), so as to realize the peak load regulation function of the coal-fired heating unit; The electric boiler (4), the first high-voltage power switch (41), the second high-voltage power switch (42), the heat network heat exchanger (5), the first valve (51), the second valve (52), the condensate heat exchanger (7), the third valve (71), the fourth valve (72), the new energy station (2), the coal-fired unit condensate system (8), and the steam turbine generator (1) constitute a coal-fired heating unit participating in the capacity market system; The system for the coal-fired heating unit to participate in the capacity market is used to: close the second high-voltage power switch (42) of the electric boiler (4), separate the first high-voltage power switch (41), close the first valve (51) and the second valve (52) between the electric boiler (4) and the heat network heat exchanger (5), close the third valve (71) and the fourth valve (72) between the electric boiler (4) and the condensate heat exchanger (7), and use the electric boiler (4) to heat the condensate system (8) of the coal-fired unit using the power generation of the new energy station (2) to replace the condensate extraction system, and the replaced extraction continues to work in the steam turbine generator (1), so as to realize the function of the coal-fired heating unit to participate in the capacity market.

2. The system for using electric boilers for peak load regulation and capacity market of coal-fired heating units according to claim 1 is characterized in that: The steam turbine generator (1), the new energy station (2), the transformer (3), the electric boiler (4), the heat network heat exchanger (5), the heat network system (6), the condensate heat exchanger (7), and the coal-fired unit condensate system (8) are arranged in a large energy base.

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