Tower type solar boiler

Abstract

The invention belongs to the solar field and relates to a tower type solar boiler. The solar boiler consists of a solar reflector field and a three-section type staged and zonal heat collection tower, wherein the solar reflector field consists of three fan-shaped heliostat fields from the interior to the exterior, and solar radiation is reflected to three stages of heat absorbers respectively by the three heliostat fields to produce saturated water, dry saturated vapor and superheated vapor. Due to the adoption of miniature heliostats, on one hand, the uniformity and the controllability of the energy flux density of light spots are improved, and the efficiency is largely improved; and on the other hand, the accuracy requirement of a heliostat tracking control system is lowered, and the cost is lowered. The heat absorbers are divided into three sections according to the heating power properties of the water and the vapor in different heat absorption processes. Meanwhile, the heliostat fields are designed according to the energy flux distribution requirements of all the heat absorbers, and the problems that two-phase flow in a single stage of heat absorber or two stages of heat absorbers causes instable heat exchange and nonuniform heat stress distribution on the surface of the heat absorber are solved. The solar boiler is suitable for solar power stations.

Description

technical field [0001] The invention belongs to the field of solar energy, in particular to a tower solar boiler. Background technique [0002] In a common coal-fired boiler, the Rankine cycle is adopted, using water / steam as the working medium, and goes through three stages (water heating, vaporization, superheating), five states (unsaturated water, saturated water, wet saturated steam, dry The thermal process of saturated steam, superheated steam) produces high temperature and high pressure superheated steam, which enters the steam turbine to do work for power generation. Tower solar boilers use solar energy to replace the heat released by coal combustion in coal-fired boilers to heat the working medium, which is a technology with extremely high commercial prospects. [0003] At present, most tower-type solar power plants use large-area heliostats to reflect solar radiation to heat absorbers to heat heat transfer fluids, such as molten salt, heat transfer oil, etc., and t...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem described in the background art that in a solar boiler using water / steam as a working medium, the energy flow distribution on the heating surface of the heat absorber is uneven and unstable, and the thermal process in the heat absorber is complicated. Changes in thermal performance and high control precision requirements for heliostat devices

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