Solar thermal power system

Abstract

The invention relates to a solar thermal power system. The system, which is integrated with particulate heat absorption, heat storage and direct contact heat exchange, comprises a particulate heat absorption unit, a particulate heat storage unit, a direct contact type superheated steam generation unit and a steam power unit. In the operation process of the system, heat storage particles first absorb solar radiation heat energy in the particulate heat absorption unit to become high-temperature heat storage particles, the high-temperature heat storage particles are stored in the particulate heat absorption unit under atmospheric pressure, the high-temperature heat storage particles drop under gravity into the high-pressure direct contact type superheated steam generation unit to generate high-pressure superheated steam, and the superheated steam is inputted into the steam power unit after passing through a buffer tank and a pressure regulation valve. The solar thermal power system can store heat energy in a large capacity under atmospheric pressure and directly generate high-pressure superheated steam for outputting power to the outside, has the characteristics of simple structure, high stored heat temperature, low cost and the like, and is particularly suitable for the development of high-power, high-efficiency, high-temperature and low-cost new-generation solar thermal power generation systems.

Description

technical field [0001] The invention relates to the field of medium and high temperature heat storage and solar thermal power, and relates to a solar thermal power system, in particular to a system which integrates heat absorption, heat storage and direct contact heat exchange of particles, and utilizes heat storage particles to absorb and converge solar radiation heat energy The solar thermal power system, which is stored at low pressure and directly contacts heat exchange with high-temperature particles and deoxygenated water to generate high-pressure superheated steam for external output power, is especially suitable for the new generation of solar thermal power generation technology with high heat storage temperature, high efficiency and low cost. Background technique [0002] Solar thermal power technology uses the mirror field to reflect and converge solar radiation to heat the heat-absorbing medium, and transfer the heat stored in the heat-absorbing medium to the worki...

AI Technical Summary

Problems solved by technology

However, in the existing technology involving the application of sand for heat storage, more attention has been paid to the design of the particle heat absorber, but little is involved in how to efficiently transfer the large amount of heat stored in the high-temperature particles to the working medium. For highly discrete and discontinuous high-temperature fluidized particles, how to overcome wear, how to ensure stable and efficient operation, how to improve heat transfer efficiency, and how to overcome the local overheating problem caused by heat transfer of discrete particles is a big challenge. These factors All directly affect the successful application and promotion of high temperature particle fluidization technology in the field of solar thermal power

[0004] In the prior art, there is also a method of using particle fluidization for indirect heat exchange to generate steam. However, this method has problems such as increased power loss and energy loss caused by fluidization gas, severe wear and low heat exchange efficiency.

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