Deep peak regulation system and method in coal gas power generation by utilizing fused salt heat storage

By designing a deep peak shaving system that utilizes molten salt heat storage, the problem of molten salt energy storage in the prior art is difficult to effectively utilize in gas power generation, and flexible peak shaving is achieved during peaks and troughs of power grid power consumption, reducing energy waste and energy consumption, while improving power generation efficiency and safety.

CN119933820APending Publication Date: 2025-05-06XINJIANG XINYI CARBON ENERGY ENVIRONMENTAL PROTECTION TECH CO LTD
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Patent Information

Application Number
CN202411944767.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-27
Publication Date
2025-05-06

AI Technical Summary

Technical Problem

The prior art is difficult to effectively utilize molten salt energy storage to perform deep peak regulating in gas power generation, and the safety accident risk of molten salt energy storage is high, and the cost is high and not economical.

Method used

Design a deep peak regulating system that uses molten salt heat storage, including a gas generator set and molten salt heat exchange device. Through components such as molten salt circulation pump, electric heating device and molten salt heat exchanger, valve group switching is used to achieve molten salt heating and storage, and promptly respond to the peaks and troughs of power grid electricity use.

Benefits of technology

It is realized that the thermal energy of molten salt is used to increase the power generation during peak power consumption of the power grid, and the power on-grid is reduced during low power consumption, reducing energy waste, reducing energy consumption, and improving power generation efficiency. It also reduces the risk of safety accidents of molten salt energy storage through safe design.

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Abstract

The invention provides a deep peak regulation system and method in coal gas power generation through fused salt heat storage, the system comprises a coal gas generator set and a fused salt heat exchange device, the fused salt heat exchange device comprises a fused salt storage assembly, a fused salt cold storage tank, a fused salt circulating pump, an electric heating device and a fused salt heat exchanger, one end of the fused salt circulating pump is connected with the fused salt heat exchanger and the input end of the electric heating device, the other end of the fused salt circulating pump is connected with the fused salt heat exchanger and the output end of the electric heating device, and the other end of the fused salt circulating pump is connected with the fused salt storage assembly. Valve sets are arranged at the joints of the fused salt circulating pump and the structure, and the fused salt heat exchanger is connected with a gas generator set. The deep peak regulation system and method in coal gas power generation by utilizing fused salt heat storage have the advantages that the coal gas usage amount is reduced, the heat energy efficiency is improved, and energy waste is reduced.
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Description

Technical Field

[0001] The present invention relates to the technical field of coal gas power generation, and in particular to a deep peak regulation system and method in coal gas power generation using molten salt heat storage. Background Art

[0002] The amount of electricity generated is limited by the power consumption of the power grid. It is not possible to generate as much as you want. It is necessary to generate electricity according to the degree instruction. The power consumption of the power grid has peaks and valleys. When the power consumption is peak, the power plant needs to generate more electricity, and when the power consumption is low, the power plant needs to generate less electricity, which conflicts with gas production. There are many technologies for using energy storage to participate in peak power generation. The most commonly used are pumped storage, chemical storage (lithium batteries), compressed air storage, etc. Molten salt is a medium for energy conversion in tower solar power generation. It uses solar energy to heat, melt, and store thermal energy. Then, the molten salt heat energy is used to exchange heat with water, heated into steam, and driven to generate steam turbine generator sets. Molten salt energy storage has many advantages such as high energy density, long heat storage time, and low scale cost. It is highly complementary to the characteristics of new energy. However, it is costly and uneconomical to use molten salt alone to store energy and participate in peak regulation. It has not yet been used in gas power generation energy storage. The losses caused by safety accidents in molten salt energy storage are relatively serious. If the temperature in the molten salt system is too low, it is difficult to clean and resume production after the molten salt solidifies at low temperature, resulting in a large amount of economic losses. Summary of the invention

[0003] The purpose of the present invention is to provide a system and method for deep peak regulation in coal gas power generation using molten salt heat storage, so as to solve the above-mentioned problems existing in the prior art.

[0004] A deep peak-shaving system in coal gas power generation using molten salt heat storage, comprising a coal gas generator set and a molten salt heat exchange device, the molten salt heat exchange device comprising a molten salt storage component, a molten salt cold storage tank, a molten salt circulation pump, an electric heating device and a molten salt heat exchanger, one end of the molten salt circulation pump is respectively connected to the input end of the molten salt heat exchanger and the electric heating device, the other end of the molten salt circulation pump is respectively connected to the output end of the molten salt heat exchanger and the electric heating device, the other end of the molten salt circulation pump is connected to the molten salt storage component, the connection between the molten salt circulation pump and the above structure is provided with a valve group, and the molten salt heat exchanger is connected to the coal gas generator set.

[0005] The working process and principle of the above structure are as follows: When the power consumption of the power grid is at a low point, the valve group is switched, and the low-temperature molten salt in the molten salt storage component is sent to the electric heating device by the molten salt circulation pump; the excess electricity generated by the gas-fired generator set is used to heat the low-temperature molten salt in the molten salt storage component through the electric heating device, and then the heated molten salt is stored in the molten salt storage component; when the power consumption of the power grid is at a peak point, the valve group is switched, and the hot molten salt in the molten salt storage component is transported to the molten salt heat exchanger to heat the feed water in the gas-fired generator set, and after the feed water is heated to a specific temperature, the feed water is sent back to the boiler in the gas-fired generator set; the temperature of the molten salt after the heat exchange drops, and it is returned to the molten salt storage component for storage under the action of the molten salt circulation pump, waiting for the next low power consumption point, to repeat the heating of the molten salt and energy storage.

[0006] Furthermore, the valve group includes a first three-way valve and a second three-way valve, one end of the first three-way valve is connected to the molten salt circulation pump, and the other two ends of the first three-way valve are respectively connected to the input ends of the molten salt heat exchanger and the electric heating device, one end of the second three-way valve is connected to the molten salt circulation pump, and the other two ends of the second three-way valve are respectively connected to the input ends of the molten salt heat exchanger and the electric heating device.

[0007] When the valve group is switched, the first three-way valve is set to control the low-temperature molten salt in the molten salt storage component to be input into the electric heating device and the high-temperature molten salt in the molten salt storage component to be input into the molten salt heat exchanger respectively, while the second three-way valve is set to control the high-temperature molten salt output from the electric heating device to be input into the molten salt storage component and the low-temperature molten salt output from the molten salt heat exchanger to be input into the molten salt storage component respectively.

[0008] Furthermore, the molten salt storage assembly includes a molten salt hot storage tank and a molten salt cold storage tank, a first U-shaped connecting pipe is arranged on the top of the molten salt cold storage tank, a third three-way valve is arranged in the middle of the first U-shaped connecting pipe, two ends of the third three-way valve are respectively connected to the first U-shaped connecting pipe, and the other end is connected to the molten salt circulation pump; a second U-shaped connecting pipe is arranged on the top of the molten salt hot storage tank, a fourth three-way valve is arranged in the middle of the second U-shaped connecting pipe, two ends of the fourth three-way valve are respectively connected to the second U-shaped connecting pipe, and the other end is connected to the molten salt circulation pump.

[0009] By setting the first U-shaped connecting pipe and the third three-way valve, it is possible to control the output of low-temperature molten salt from the molten salt cold storage tank and the input of low-temperature molten salt into the molten salt cold storage tank respectively. By setting the second U-shaped connecting pipe and the fourth three-way valve, it is possible to control the output of high-temperature molten salt from the molten salt hot storage tank and the input of high-temperature molten salt into the molten salt hot storage tank respectively.

[0010] A method for deep peak regulation system in coal gas power generation using molten salt heat storage, comprising the following steps: When the power consumption of the power grid is low, the valve group is switched, and the molten salt in the molten salt cold storage tank in the molten salt storage assembly is sent to the electric heating device by the molten salt circulation pump; The excess electricity generated by the gas generator set is used to heat the low-temperature molten salt in the molten salt storage component through an electric heating device, and then stored in the molten salt hot storage tank in the molten salt storage component after heating; When the power consumption of the power grid is at its peak, the valve group is switched to transport the hot molten salt from the molten salt heat storage tank to the molten salt heat exchanger to heat the feed water in the gas generator set. After the feed water is heated to a specific temperature, the feed water is returned to the boiler in the gas generator set. After heat exchange, the temperature of the molten salt drops and is returned to the molten salt cold storage tank under the action of the molten salt circulation pump for storage, waiting for the next low electricity consumption to repeat the heating of the molten salt and energy storage.

[0011] Furthermore, the temperature of the molten salt heated in the electric heating device is 400°C, the final temperature of the heated feed water is 290°C, and the temperature of the molten salt drops to 150°C after heat exchange.

[0012] Furthermore, one of the input ends of the molten salt heat exchanger is connected to the original low-temperature condensate of the gas-fired generator set, and the other output end of the molten salt heat exchanger is connected to the boiler of the gas-fired generator set.

[0013] The technical solution provided by the embodiment of the present invention may have the following beneficial effects: The present invention participates in the peak load regulation of the power grid by utilizing molten salt energy storage. The gas generator set directly generates electricity according to the amount of gas, without dissipation, thereby reducing energy waste. At the same time, all the gas is directly used for power generation according to the amount of gas. When the power consumption of the power grid is low, the excess electricity generated by the gas generator set is used to heat the molten salt, and the electrical energy is converted into the thermal energy of the molten salt and stored, so that the amount of electricity connected to the grid can be reduced further; when the power consumption of the power grid is at a peak, the thermal energy of the molten salt is used to heat the boiler feed water to about 300°C, reducing the amount of gas used, thereby generating more electricity on the basis of the same amount of gas. In this way, under the premise of the same amount of gas, the amount of electricity connected to the grid can be reduced further when the power consumption is low, and the amount of electricity connected to the grid can be increased more when the power consumption is at a peak, thereby participating in the deep peak load regulation of the power grid, reducing the energy waste caused by dissipation, and reducing energy consumption; more electricity connected to the grid, greater benefits; reducing gas dissipation, and obvious environmental protection and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The present invention is a schematic structural diagram of a deep peak regulation system in coal gas power generation using molten salt heat storage.

[0015] Figure numerals: 1. gas generator set; 2. molten salt cold storage tank; 3. molten salt hot storage tank; 4. molten salt circulation pump; 5. electric heating device; 6. molten salt heat exchanger; 7. first three-way valve; 8. second three-way valve; 9. first U-shaped connecting pipe; 10. third three-way valve; 11. second U-shaped connecting pipe; 12. fourth three-way valve. DETAILED DESCRIPTION

[0016] The following will describe the technical solutions in the embodiments of the present invention in detail in conjunction with the accompanying drawings in the embodiments of the present invention. The described embodiments are only part of the embodiments of the present invention.

[0017] like Figure 1 As shown, this embodiment provides a deep peak-shaving system in gas power generation using molten salt heat storage, including a gas generator set 1 and a molten salt heat exchange device, the molten salt heat exchange device including a molten salt storage component, a molten salt cold storage tank 2, a molten salt circulation pump 4, an electric heating device 5 and a molten salt heat exchanger 6, one end of the molten salt circulation pump 4 is respectively connected to the input end of the molten salt heat exchanger 6 and the electric heating device 5, the other end of the molten salt circulation pump 4 is respectively connected to the output end of the molten salt heat exchanger 6 and the electric heating device 5, the other end of the molten salt circulation pump 4 is connected to the molten salt storage component, the connection between the molten salt circulation pump 4 and the above structure is provided with a valve group, and the molten salt heat exchanger 6 is connected to the gas generator set 1.

[0018] The working process and principle of the above structure are as follows: When the power consumption of the power grid is low, the valve group is switched, and the low-temperature molten salt in the molten salt storage component is sent to the electric heating device 5 by the molten salt circulation pump 4; the excess electricity generated by the gas generator set 1 is used to heat the low-temperature molten salt in the molten salt storage component through the electric heating device 5, and then stored in the molten salt storage component after heating; when the power consumption of the power grid is peak, the valve group is switched, and the hot molten salt in the molten salt storage component is transported to the molten salt heat exchanger 6 to heat the feed water in the gas generator set 1, and after heating the feed water to a specific temperature, the feed water is returned to the boiler in the gas generator set 1; the temperature of the molten salt after the heat exchange drops, and under the action of the molten salt circulation pump 4, it is returned to the molten salt storage component for storage, waiting for the next low power consumption, and the molten salt is repeatedly heated and stored.

[0019] In another embodiment of the present invention, the valve group includes a first three-way valve 7 and a second three-way valve 8, one end of the first three-way valve 7 is connected to the molten salt circulation pump 4, and the other two ends of the first three-way valve 7 are respectively connected to the input ends of the molten salt heat exchanger 6 and the electric heating device 5, one end of the second three-way valve 8 is connected to the molten salt circulation pump 4, and the other two ends of the second three-way valve 8 are respectively connected to the input ends of the molten salt heat exchanger 6 and the electric heating device 5.

[0020] When the valve group is switched, the first three-way valve 7 is set to control the low-temperature molten salt in the molten salt storage component to be input into the electric heating device 5 and the high-temperature molten salt in the molten salt storage component to be input into the molten salt heat exchanger 6 respectively, while the second three-way valve 8 is set to control the high-temperature molten salt output from the electric heating device 5 to be input into the molten salt storage component and the low-temperature molten salt output from the molten salt heat exchanger 6 to be input into the molten salt storage component respectively.

[0021] In another embodiment of the present invention, the molten salt storage assembly includes a molten salt hot storage tank 3 and a molten salt cold storage tank 2, a first U-shaped connecting pipe 9 is arranged on the top of the molten salt cold storage tank 2, a third three-way valve 10 is arranged in the middle of the first U-shaped connecting pipe 9, two ends of the third three-way valve 10 are respectively connected to the first U-shaped connecting pipe 9, and the other end is connected to the molten salt circulation pump 4; a second U-shaped connecting pipe 11 is arranged on the top of the molten salt hot storage tank 3, a fourth three-way valve 12 is arranged in the middle of the second U-shaped connecting pipe 11, two ends of the fourth three-way valve 12 are respectively connected to the second U-shaped connecting pipe 11, and the other end is connected to the molten salt circulation pump 4.

[0022] By setting the first U-shaped connecting pipe 9 and the third three-way valve 10, it is possible to control the output of low-temperature molten salt from the molten salt cold storage tank 2 and the input of low-temperature molten salt into the molten salt cold storage tank 2 respectively. By setting the second U-shaped connecting pipe 11 and the fourth three-way valve 12, it is possible to control the output of high-temperature molten salt from the molten salt hot storage tank 3 and the input of high-temperature molten salt into the molten salt hot storage tank 3 respectively.

[0023] A method for deep peak regulation system in coal gas power generation using molten salt heat storage, comprising the following steps: When the power grid is in low power consumption, the valve group is switched, and the molten salt in the molten salt cold storage tank 2 in the molten salt storage assembly is sent to the electric heating device 5 by the molten salt circulation pump 4; The excess electricity generated by the gas generator set 1 is used to heat the low-temperature molten salt in the molten salt storage assembly through the electric heating device 5, and then stored in the molten salt hot storage tank 3 in the molten salt storage assembly after heating; When the power consumption of the power grid is at a peak, the valve group is switched to transport the hot molten salt in the molten salt heat storage tank 3 to the molten salt heat exchanger 6 to heat the feed water in the gas generator set 1. After the feed water is heated to a specific temperature, the feed water is returned to the boiler in the gas generator set 1. After the heat exchange, the temperature of the molten salt drops, and under the action of the molten salt circulation pump 4, it returns to the molten salt cold storage tank 2 for storage, waiting for the next low electricity consumption, to repeat the heating of the molten salt and energy storage.

[0024] In another embodiment of the present invention, the temperature of the molten salt heated in the electric heating device 5 is 400°C, the final temperature of the heated feed water is 290°C, and the temperature of the molten salt after heat exchange drops to 150°C.

[0025] In another embodiment of the present invention, one input end of the molten salt heat exchanger 6 is connected to the original low-temperature condensate of the gas generator set 1 , and the other output end of the molten salt heat exchanger 6 is connected to the boiler of the gas generator set 1 .

[0026] Although the present invention has been described in detail above by general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A deep peak regulation system in coal gas power generation using molten salt heat storage, characterized in that: It includes a gas generator set and a molten salt heat exchange device, the molten salt heat exchange device includes a molten salt storage component, a molten salt cold storage tank, a molten salt circulation pump, an electric heating device and a molten salt heat exchanger, one end of the molten salt circulation pump is respectively connected to the input end of the molten salt heat exchanger and the electric heating device, the other end of the molten salt circulation pump is respectively connected to the output end of the molten salt heat exchanger and the electric heating device, the other end of the molten salt circulation pump is connected to the molten salt storage component, the connection between the molten salt circulation pump and the above structure is provided with a valve group, and the molten salt heat exchanger is connected to the gas generator set.

2. The deep peak regulation system in coal gas power generation using molten salt heat storage according to claim 1 is characterized in that: The valve group includes a first three-way valve and a second three-way valve, one end of the first three-way valve is connected to a molten salt circulation pump, and the other two ends of the first three-way valve are respectively connected to the input ends of a molten salt heat exchanger and an electric heating device, one end of the second three-way valve is connected to the molten salt circulation pump, and the other two ends of the second three-way valve are respectively connected to the input ends of a molten salt heat exchanger and an electric heating device.

3. The deep peak regulation system in coal gas power generation using molten salt heat storage according to claim 2 is characterized in that: The molten salt storage assembly includes a molten salt hot storage tank and a molten salt cold storage tank, a first U-shaped connecting pipe is arranged on the top of the molten salt cold storage tank, a third three-way valve is arranged in the middle of the first U-shaped connecting pipe, two ends of the third three-way valve are respectively connected to the first U-shaped connecting pipe, and the other end is connected to the molten salt circulation pump; a second U-shaped connecting pipe is arranged on the top of the molten salt hot storage tank, a fourth three-way valve is arranged in the middle of the second U-shaped connecting pipe, two ends of the fourth three-way valve are respectively connected to the second U-shaped connecting pipe, and the other end is connected to the molten salt circulation pump.

4. A method for deep peak regulation system in coal gas power generation using molten salt heat storage as claimed in claim 1, characterized in that: The following steps are involved: When the power consumption of the power grid is low, the valve group is switched, and the molten salt in the molten salt cold storage tank in the molten salt storage assembly is sent to the electric heating device by the molten salt circulation pump; The excess electricity generated by the gas generator set is used to heat the low-temperature molten salt in the molten salt storage component through an electric heating device, and then stored in the molten salt hot storage tank in the molten salt storage component after heating; When the power consumption of the power grid is at its peak, the valve group is switched to transport the hot molten salt from the molten salt heat storage tank to the molten salt heat exchanger to heat the feed water in the gas generator set. After the feed water is heated to a specific temperature, the feed water is returned to the boiler in the gas generator set. After heat exchange, the temperature of the molten salt drops and is returned to the molten salt cold storage tank under the action of the molten salt circulation pump for storage, waiting for the next low electricity consumption to repeat the heating of the molten salt and energy storage.

5. The method of using molten salt heat storage in deep peak regulation system in coal gas power generation according to claim 3 is characterized in that: The temperature of the molten salt heated in the electric heating device is 400°C, the final temperature of the heated feed water is 290°C, and the temperature of the molten salt after heat exchange drops to 150°C.

6. The method of using molten salt heat storage in deep peak regulation system in coal gas power generation according to claim 3 is characterized in that: One of the input ends of the molten salt heat exchanger is connected to the original low-temperature condensate of the gas-fired generator set, and the other output end of the molten salt heat exchanger is connected to the boiler of the gas-fired generator set.