Delayed falling type solid particle heat absorber for solar thermal power generation

Abstract

The invention discloses a delayed falling type solid particle heat absorber for solar thermal power generation. The heat absorber comprises a spiral quartz glass tube assembly (1), solid particles (2)which are located in the quartz glass tube assembly (1), an outer heat preservation layer (3) which surrounds the periphery of the quartz glass tube assembly (1), an inlet flow guide section (19) which is installed at the upper part of the quartz glass tube assembly (1), an outlet flow guide section (20) which is installed at the lower part of the quartz glass tube assembly (1), a particle distributor (17) which is arranged above the inlet flow guide section (19), a particle collector (18) which is arranged below the outlet flow guide section (20), a low-temperature particle storage tank (5)which is arranged above the particle distributor (17), a high-temperature particle storage tank (10) which is arranged below the particle collector (18), a low-temperature particle storage tank outletvalve (7) which is located between the low-temperature particle storage tank (5) and the particle distributor (17), a high-temperature particle storage tank inlet valve (8) which is installed betweenthe particle collector (18) and the high-temperature particle storage tank (10), low-temperature solid particles (6) which are stored in the low-temperature particle storage tank (5) and high-temperature solid particles (9) which are stored in the high-temperature particle storage tank (10); and the quartz glass tube assembly (1) faces radiant energy flows (4).

Description

technical field [0001] The invention relates to a heat absorber for solar thermal power generation, in particular to a solid particle heat absorber. Background technique [0002] Improving the efficiency of solar thermal power generation is one of the main methods to reduce the cost of power plants. Because the concentration ratio of tower power plants can reach more than 1000, it can effectively improve the operating parameters of the working medium, so it has great potential in improving power generation efficiency. Traditional heat-absorbing working fluids such as water vapor / heat transfer oil, molten salt / liquid metal, etc. are limited by operating temperature and chemical stability, and have limited effects in improving power generation efficiency and reducing power generation costs. Because solid particles have the advantages of high temperature resistance, stable performance, low price, and large specific heat, they are used to drive ultra-supercritical steam power cy...

AI Technical Summary

Problems solved by technology

[0004] U.S. Patent US9732986B2 discloses a method of using porous media in the flow channel to slow down the falling speed of solid particles and enhance heat transfer, but the disadvantage is that it will cause blockage of the porous media

U.S. Patent US2015300692A1 discloses a particle heat absorber that delays the falling of solid particles with a regularly arranged hexagonal prism structure. The solid particles flow downward through the gaps between the hexagonal prisms, and the manufacturing method of the obstacles is relatively complicated.

U.S. Patent US20120132398 discloses a particle heat absorber with an inverted V-shaped metal structure to delay the falling of solid particles, but the disadvantage is that it will cause damage to obstacles

Chinese patent CN105135716A discloses a tubular solid particle heat absorber with inserts. Solid particles flow from top to bottom on the helical rotating insert in the tube, which effectively increases the radiation residence time of particles, but there is a problem of solid particle flow blockage. insufficient

Images