High-temperature solid particle heat exchange system

Abstract

The invention discloses a high-temperature solid particle heat exchange system. Gas is taken as an intermediate heat exchange medium between high-temperature particles and a power cycle working medium, and the intermediate heat exchange medium is used for heat exchange between the high-temperature particles and the power cycle working medium, so that the technical problems of low heat exchange efficiency, serious abrasion of a heat exchange surface and the like of a particle heat exchanger are effectively solved. According to the high-temperature solid particle heat exchange system, leaked particles in the particle lifting process are recycled through pneumatic conveying, a solution is provided for heat recycling of the conveyed gas, low-temperature particles leaked in a particle lifting system or other conveying systems are conveyed into a low-temperature particle storage tank through a pneumatic conveying device, the low-temperature particle storage tank is a positive-pressure storage tank, and after the conveyed gas of the pneumatic conveying device is continuously input, positive pressure is formed in the tank, heat exchange gas in the particle/gas heat exchanger is effectivelyprevented from flowing back into the low-temperature particle storage tank, the pressure of the low-temperature particle storage tank is balanced through a check valve, the conveyed gas is guided into the particle/gas heat exchanger, waste heat of the low-temperature particle storage tank is recycled, and the particle heat loss is effectively reduced.

Description

technical field [0001] The invention belongs to the field of solar thermal power generation, and in particular relates to a heat exchange system for high-temperature solid particles. Background technique [0002] In recent years, with the increasingly prominent fossil energy crisis and environmental problems, solar thermal power generation technology has received extensive attention. Tower-type photothermal power generation technology has the advantages of high concentration ratio, high power cycle parameters, and high cycle system efficiency, and has great development potential. However, the huge investment cost of tower photothermal technology seriously limits its application development. Improving the power generation efficiency of power stations is one of the important measures to reduce power generation costs. At present, the heat storage medium used in tower solar thermal power generation is binary nitrate (60% NaNO 3 +40% KNO 3 ), but its applicable temperature is...

AI Technical Summary

Problems solved by technology

[0007] The invention provides a high-temperature solid particle heat exchange system for tower-type solar thermal power generation, which is used for heat exchange between high-temperature solid particles and power cycle working fluid, and effectively solves the problem of low heat exchange efficiency and serious wear of the heat exchange surface of the particle heat exchanger and other technical problems

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