A power plant energy storage and peak-shaving device based on hygroscopic solution

Abstract

This invention discloses a power plant energy storage and peak-shaving device based on a hygroscopic solution, belonging to the technical field of power energy-saving equipment. The device includes a circulating liquid storage tank for storing the hygroscopic solution, connected to a heating water heat exchanger to continuously heat the heating water main pipe; and an electric boiler connected to the circulating liquid storage tank, which heats the heating water main pipe via a condenser. By setting different modes, the absorption unit, electric boiler concentration unit, and compressor concentration unit can be activated under different conditions. During the heating season, when it is necessary to increase the power output to the outside of the plant, only the absorption unit needs to be activated; during the heating season, when it is necessary to significantly reduce the power output to the outside of the plant, the absorption unit, electric boiler concentration unit, and compressor concentration unit all need to be activated simultaneously. By activating different devices at different times, the utilization rate of the device is maximized while minimizing energy consumption.

Description

Technical Field

[0001] This invention belongs to the field of power energy-saving equipment technology, specifically relating to a power plant energy storage and peak-shaving device based on a hygroscopic solution. Background Technology

[0002] An open absorption heat pump is a circulating system that utilizes a low-grade heat source to pump heat from a low-temperature heat source to a high-temperature heat source. It is an effective device for recovering and utilizing low-grade heat energy, offering the dual benefits of energy conservation and environmental protection. By coupling open absorption heat pump technology with power plant peak shaving, energy-saving effects can be achieved.

[0003] In the process of using electric boilers for heating, hygroscopic solutions are used to recover waste heat from flue gas, thereby improving boiler efficiency, reducing coal consumption for power generation and heating, and flexibly changing various operating conditions to cope with the power plant's peak-shaving situation. Chinese patent CN 202023168987.8 discloses an energy storage peak-shaving tank thermal storage system, which uses the load of the heating unit to meet different heating needs during the day and night. However, its regulation results are relatively simple, and the needs it meets are also relatively simple. Summary of the Invention

[0004] The purpose of this invention is to provide a power plant energy storage peak-shaving device based on a hygroscopic solution, in order to solve the problem mentioned in the background art where the existing power plant energy storage peak-shaving device based on a hygroscopic solution is affected by the country's adjustments to electricity supply at different times, thus affecting the heating of the thermal power plant.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a power plant energy storage and peak-shaving device based on a hygroscopic solution, comprising a circulating liquid storage tank for storing a hygroscopic solution, which is connected to a heating water heat exchanger and continuously provides heating to the heating water main pipe;

[0006] An electric boiler is used to connect to the circulating liquid storage tank and to deliver heat to the heating water main pipe through a condenser;

[0007] Solution heat exchanger A is connected to the circulating liquid storage tank and the electric boiler, and is located between the two.

[0008] Preferably, an absorber is also installed on one side of the circulating liquid storage tank, and the absorber is connected to the heating water heat exchanger.

[0009] Preferably, it also includes an energy storage tank for storing a large amount of hygroscopic solution, which forms a circulation loop with the circulating storage tank.

[0010] Preferably, it further includes an evaporator, a separator, and a compressor, wherein the evaporator is interconnected with the electric boiler and the separator, and the separator, the compressor, and the evaporator form a circulation system.

[0011] Preferably, the evaporator is connected to the condenser.

[0012] Preferably, the separator is connected to the solution heat exchanger B.

[0013] Preferably, the solution heat exchanger B and the energy storage tank form a solution loop.

[0014] Preferably, the solution heat exchanger B is connected to the electric boiler.

[0015] Preferably, the condenser and the heating water main pipe form a circuit.

[0016] Preferably, the heating water heat exchanger and the heating water main pipe form a loop.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. By setting different modes, the absorption unit, electric boiler, and compressor concentration modes can be selected for different situations. During the heating season, when a slight reduction in the power output to the outside of the plant is needed, the absorption unit should be used in conjunction with the electric boiler for concentration. During the non-heating season, when there is no heating water and the power plant generates too much electricity that cannot be effectively consumed, only the compressor needs to be activated for concentration. During the heating season, when a reduction in the power output to the outside of the plant is needed and the heating water temperature is too high, the electric boiler needs to be used for concentration. During the heating season, when an increase in the power output to the outside of the plant is needed, only the absorption unit needs to be activated. During the heating season, when a significant reduction in the power output to the outside of the plant is needed, the absorption unit, electric boiler, and compressor concentration systems all need to be activated simultaneously. By activating different devices at different times, the utilization rate of the system can be maximized while minimizing energy consumption. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of Embodiment 1 of the present invention;

[0020] Figure 2 This is a schematic diagram of Embodiment 2 of the present invention;

[0021] Figure 3 This is a schematic diagram of Embodiment 3 of the present invention;

[0022] Figure 4 This is a schematic diagram of Embodiment 4 of the present invention;

[0023] Figure 5 This is a schematic diagram of Embodiment 5 of the present invention.

[0024] In the diagram: 1. Circulating liquid storage tank; 2. Heating water heat exchanger; 3. Heating water main pipe; 4. Electric boiler; 5. Solution heat exchanger A; 6. Absorber; 7. Energy storage tank; 8. Evaporator; 9. Separator; 10. Compressor; 11. Condenser; 12. Solution heat exchanger B; 13. Condenser. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Example 1:

[0027] When the absorption section of the absorber 6 is started, the hygroscopic solution is pumped out from the circulating solution tank and exchanged heat with the heating water heat exchanger 2 to cool down. Then it enters the absorber 6 to directly spray the generated flue gas. Utilizing the hygroscopicity of the solution, it absorbs the moisture and heat in the flue gas, causing the solution temperature to rise and the concentration to decrease. It then returns to the interior of the circulating storage tank 1 and is concentrated in conjunction with the electric boiler 4. The solution is heated by the solution heat exchanger 5 after passing through the circulating storage tank 1, and then enters the electric boiler 4 to be heated to a boiling state. The generated steam is cooled by the heating water through the condenser 13. The condensate enters the condensation tank 11, while the unevaporated part increases in concentration. After being cooled by the solution heat exchanger 5, it enters the circulating solution tank.

[0028] In conjunction with the energy storage tank 7, when the concentration in the circulating storage tank 1 continues to decrease, the solution is replaced with the circulating solution tank to maintain the concentration in the circulating storage tank 1.

[0029] In this state, such as Figure 1 As mentioned above, it can continuously absorb heat from flue gas, improve the boiler's power generation efficiency, and is mainly suitable for situations where the power output to the outside of the plant needs to be slightly reduced during the heating season.

[0030] Example 2:

[0031] The solution is concentrated using only the compressor 10. The solution enters the solution heat exchanger 5 from the inside of the energy storage tank 7 and is heated to boiling through the evaporator 8. Then it enters the separator 9. The separated steam is compressed by the compressor 10 and used as driving steam to enter the hot side of the evaporator 8 to be condensed by the solution. The condensate enters the condensation tank 11. The concentrated solution returns to the inside of the solution heat exchanger 5 from the bottom of the separator 9, and after cooling, it returns to the energy storage tank 7 again.

[0032] In this mode, there is no need to use the electric boiler 4 for concentration. The electric boiler 4 serves as a start-up heat source to activate the compressor 10's cycle. Additionally, it acts as a supplementary heat source. After the compressor 10 starts successfully, the electric boiler 4 switches to low-power operation to provide appropriate supplementary heat to the device, thereby maintaining a stable concentration effect.

[0033] This state is as follows Figure 2 As shown, this method is mainly applicable to situations where there is no heating water during the non-heating season and the power plant generates too much electricity that cannot be effectively consumed. This method can convert most of the electrical energy into the concentration potential energy of the solution and a small portion into the thermal energy of the solution, which is stored in the thermal storage tank for use in winter to absorb heat from flue gas to heat the heating water.

[0034] Example 3:

[0035] The solution is concentrated using only the electric boiler 4. The solution is heated from the circulating storage tank 1 through the solution heat exchanger 5 and then enters the electric boiler 4 to be heated to boiling. The generated steam is cooled by the heating water through the condenser 13. The condensate enters the condensation tank 11, while the unevaporated part increases in concentration. After being cooled by the solution heat exchanger 5, it enters the interior of the circulating solution tank.

[0036] This state is as follows Figure 3 As shown, it is mainly applicable to situations during the heating season where it is necessary to reduce the power output to the outside of the plant, but the heating water temperature is too high.

[0037] Example 4:

[0038] Absorption is performed solely by absorber 6. After being pumped from the circulating solution tank, the solution exchanges heat with the heating water heat exchanger 2 for cooling before entering absorber 6 again for direct contact spraying of the flue gas. Utilizing the hygroscopic nature of the solution, it absorbs moisture and heat from the flue gas. Subsequently, the solution temperature rises and the concentration decreases, returning to the circulating storage tank 1. In conjunction with the energy storage tank 7, the solution is exchanged with the circulating solution tank to maintain the concentration in the circulating storage tank 1.

[0039] This state is as follows Figure 4 As shown, this is mainly applicable to situations where it is necessary to increase the power output to the outside of the plant during the heating season.

[0040] Example 5:

[0041] Simultaneously, the absorption mode of absorber 6, the concentration mode of compressor 10, and the concentration mode of electric boiler 4 are activated. After the solution is pumped out from the circulating solution tank, it exchanges heat with the heating water heat exchanger 2 to cool down, and then enters the absorber 6 to directly spray the flue gas. Utilizing the hygroscopicity of the solution, it absorbs the moisture and heat in the flue gas. After that, the solution temperature rises and the concentration decreases, and it returns to the circulating storage tank 1.

[0042] The electric boiler 4 is used for primary enrichment, and the enrichment process is as shown in Example 3. The compressor 10 is used for secondary enrichment, and the enrichment process is as shown in Example 2. However, in this process, the electric boiler 4, in addition to serving as a start-up heat source and a supplementary heat device, also needs to serve as an enrichment device.

[0043] In conjunction with the energy storage tank 7, the solution is replaced with the circulating solution tank to maintain the concentration of the circulating storage tank 1.

[0044] This state is as follows Figure 5 As shown, it is mainly applicable to situations where the power output to the outside of the plant needs to be significantly reduced during the heating season.

[0045] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A control method for a power plant energy storage peak-shaving device based on a hygroscopic solution, characterized in that: include The peak-shaving device includes: a circulating liquid storage tank (1) for storing hygroscopic solution, which is connected to the heating water heat exchanger (2) and continuously heats the heating water in the heating water header (3); An electric boiler (4) is used to connect to the circulating liquid storage tank (1) and to heat the heating water in the heating water main pipe (3) through a condenser (13); Solution heat exchanger A (5) is connected to the circulating liquid storage tank (1) and the electric boiler (4), and is located between the two; An absorber (6) is also installed on one side of the circulating liquid storage tank (1), and the absorber (6) is connected to the heating water heat exchanger (2). It also includes an energy storage tank (7) for storing a large amount of hygroscopic solution, which forms a circulation loop with the circulating storage tank (1); It also includes an evaporator (8), a separator (9) and a compressor (10), wherein the evaporator (8) is interconnected with the electric boiler (4) and the separator (9), and the separator (9) forms a circulation system with the compressor (10) and the evaporator (8); The evaporator (8) is connected to the condenser (11); The separator (9) is connected to the solution heat exchanger B (12); The control method includes setting different modes to select the mode of activating the absorber (6), the electric boiler (4) for enrichment and the compressor (10) for enrichment under different conditions. When the power output to the outside of the plant needs to be reduced slightly during the heating season, the absorber (6) needs to be used in conjunction with the electric boiler (4) for enrichment. In the case of non-heating season, when there is no heating water and the power plant generates too much electricity that cannot be effectively consumed, the compressor (10) only needs to be activated for enrichment. In the case of heating season, when the power output to the outside of the plant needs to be reduced and the heating water temperature is too high, the electric boiler (4) needs to be used for enrichment. In the case of heating season, when the power output to the outside of the plant needs to be increased, the absorber (6) only needs to be activated. In the case of heating season, when the power output to the outside of the plant needs to be reduced significantly, the absorber (6), the electric boiler (4) for enrichment and the compressor (10) for enrichment all need to be activated simultaneously.

2. The control method for a power plant energy storage peak-shaving device based on a hygroscopic solution according to claim 1, characterized in that: The solution heat exchanger B (12) and the energy storage tank (7) form a solution circuit.

3. The control method for a power plant energy storage peak-shaving device based on a hygroscopic solution according to claim 1, characterized in that: The solution heat exchanger B (12) is connected to the electric boiler (4).

4. The control method for a power plant energy storage peak-shaving device based on a hygroscopic solution according to claim 1, characterized in that: The condenser (13) and the heating water main pipe (3) form a circuit.

5. The control method for a power plant energy storage peak-shaving device based on a hygroscopic solution according to claim 1, characterized in that: The heating water heat exchanger (2) and the heating water main pipe (3) form a circuit.

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