A two-stage heated volumetric solar air receiver

Abstract

The invention discloses a secondary heating volumetric solar air receiver belonging to the field of solar heat utilization. The secondary heating volumetric solar air receiver is composed of a primary preheating zone, an air flow channel and a secondary heating zone. In the preheating zone, the cavity between the heat-insulating shell, the support plate and the heat-insulating inner plate forms a first-level preheating zone, the cavity between the flow channel heat-insulating shell, the support plate and the inner quartz glass forms an air flow channel, and the heating zone is insulated and The inner cylindrical cavity surrounded by the shell of the support plate forms the secondary heating zone. Foam ceramic materials are installed in the primary preheating zone, air flow channel and secondary heating zone, and the front surface of the receiver is covered with quartz glass outside to form a secondary heating volumetric solar air receiver; by adjusting the air in the high radiation area The sequence of flow through the low-radiation area and the form of secondary heating improve the absorption efficiency of the solar receiver. The invention can be used in parallel or alone; it can improve the absorption efficiency of the solar receiver.

Description

technical field [0001] The invention belongs to the field of solar thermal utilization, in particular to a secondary heating volumetric solar air receiver. Background technique [0002] Solar energy has many advantages such as huge reserves, easy access, clean and environmental protection, etc. In recent years, the power generation technology based on solar energy has developed rapidly. There are two main types of solar power generation, one is solar photovoltaic technology, and the other is solar thermal power generation technology. Solar photovoltaic power generation uses a large area of ​​solar panels to convert the solar heat radiation received by the surface of the solar panels into electrical energy through the photovoltaic effect. The solar thermal power generation is to gather the solar radiation first through the mirror field laid on a large area, collect it through the receiver and convert it into the internal energy of the working medium (air, molten salt, etc.),...

AI Technical Summary

Problems solved by technology

[0004] Existing volumetric receivers generally adopt the primary heating form of directly heating the working medium. Due to the high energy density in the middle and low energy density on both sides due to the often concentrated solar radiation, the heating uniformity of the working medium is poor and the heating performance is limited.

And because the heating surface of the volumetric receiver is exposed to the environment in a large area, and the heating surface heated by solar radiation is directly exposed to the environment, the heat loss is huge, which seriously limits the heating efficiency of the volumetric receiver, so it is urgent to improve A new volumetric receiver with uniform heating of working fluid and reduced overall heat loss

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