A method and device for combined supercritical power generation and energy storage coupled utilization of solar energy and natural gas cold energy

A technology of solar thermal power generation and natural gas, applied in solar thermal power generation, mechanical power generated by solar energy, pump devices, etc., can solve problems such as changes and system influences, reduce heat storage temperature difference, reduce external heat dissipation losses, high-efficiency output and The effect of using

Active Publication Date: 2021-04-02
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its advantages are obvious, but the process of energy storage and energy release will bring about changes in air parameters, and at the same time, the air parameters at the inlet of the air compressor and expander have a greater impact on the entire system

Method used

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  • A method and device for combined supercritical power generation and energy storage coupled utilization of solar energy and natural gas cold energy
  • A method and device for combined supercritical power generation and energy storage coupled utilization of solar energy and natural gas cold energy
  • A method and device for combined supercritical power generation and energy storage coupled utilization of solar energy and natural gas cold energy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Such as figure 1 As shown, when the solar energy is sufficient during the day to obtain sufficient solar thermal energy, the temperature of the solar heat collection and heat storage container 21 is raised to the start point of operation, the medium and high temperature solar thermal power generation system 2 starts to operate, the solar thermal power generation turbine 41 operates normally, and the solar thermal power generation turbine 41 operates normally. The first working medium inside the flat 41 enters the neutralization heat exchanger 24 to be cooled after doing work in the solar thermal power generation turbine 41, and is pressurized and heated by the gas compressor 35 for the solar thermal power generation cycle, and then is heated by the medium-high temperature solar thermal power generation heat source. The heat exchanger 22 heats up and enters the solar thermal power generation turbine 41 to complete a cycle and generate electricity. At the same time, the n...

Embodiment 2

[0048] Same as Embodiment 1, the difference is that the cooling heat exchanger 26 of solar thermal power generation "exhaust steam" is changed to a low-temperature phase change heat storage container, and its external cooling input part is removed, and a bypass valve and a pump are added to convert the exhaust steam of thermal power generation The heat is stored and released at night to generate cold energy, and a cycle of phase change heat storage and heat release is added in Comparative Example 1.

[0049] When the solar thermal power generation system is in rated operation, the exhaust steam waste heat power is equal to the cold energy power of the natural gas low-temperature power generation system. Heat storage part.

Embodiment 3

[0051] Same as Embodiment 1, the difference is that the thermal power generation capacity is reduced, and the cooling heat exchanger in the thermal power generation cycle is only the neutralization heat exchanger 24 . When the solar thermal power generation system is in rated operation, the exhaust steam waste heat power is equal to the cooling energy power of the natural gas low-temperature power generation system. The heat source can generate electricity, so that the cooling and heat released by the environment in some periods of time are the same or the error is not large.

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Abstract

The invention discloses a solar energy and natural gas cold energy combined supercritical power generation and energy storage coupling utilization method and device. The device comprises a solar heatcollection system, a medium-high temperature solar thermal power generation system, a natural gas low-temperature cold energy power generation system and a compressed air energy storage system. According to the method and device, through two sections of efficient supercritical power generation cycles of medium-high temperature solar thermal power generation and natural gas low-temperature cold energy power generation, low-temperature cold energy of a natural gas receiving station is used as a cold source of solar medium-high temperature solar thermal power generation to condense a working medium after acting, dead steam is used as a heat source of low-temperature power generation, waste heat is used as a cold and heat source of compressed air energy storage, stable electric power output ofsolar thermal power generation is kept through a heat storage system, user side demand response is achieved through compressed air energy storage, cold and heat complementation is achieved through aplurality of upgrading heat exchangers, power generation efficiency is improved through supercritical gas power generation, and latent heat loss is reduced.

Description

Technical field: [0001] The invention belongs to the technical fields of renewable energy, residual energy utilization, energy storage, energy conservation and environmental protection, and specifically relates to a method and device for combined supercritical power generation and energy storage coupled utilization of solar energy and natural gas cold energy. Background technique: [0002] Liquid natural gas needs to be converted from liquid to gas before use, and a large amount of cold energy will be released during this process. It is calculated that the cold energy released by the gasification of liquefied natural gas at -162°C under normal pressure is 779-840kJ / kg. Taking the 2 million t / a natural gas receiving station as an example, if the cold energy released by natural gas gasification is 840kJ / kg, if the cold energy is fully utilized, the annual available cold energy is about 1.68 billion MJ, which is about 467 million kilowatt-hours of electricity, if the natural g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F03G6/06F01K25/10F01K13/00F01D15/10F01D15/08F04B41/02
CPCF01D15/08F01D15/10F01K13/00F01K25/10F03G6/065F04B41/02Y02E10/46Y02E60/16Y02E70/30
Inventor 李华山王显龙卜宪标王令宝龚宇烈
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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