Energy storage method and device for solar dish Stirling system

Abstract

The invention discloses an energy storage method and device for a solar disc type Stirling system. A Stirling heat collector is filled with metallic oxide. Focused solar energy enters the heat collector. Part of energy is transmitted to a heat head of a Stirling engine for acting. Part of energy is used for increasing the temperature of the metallic oxide. When solar energy is sufficient, and the temperature rises to the reaction temperature, the metallic oxide starts to decompose and suck affluent heat. When solar energy lacks, and the temperature in the heat collector starts to drop, the metallic oxide and oxygen in a cavity of the heat collector react, and heat is released and supplied to the Stirling engine; furthermore, the heat transfer rate of the Stirling heat head is increased by the adoption of the metallic oxide, and a heat pipe is additionally arranged between the metallic oxide and the Stirling heat head. By means of the energy storage method and device, the shortcomings of the electricity generation power fluctuation even halt caused by instable sunlight are mitigated, the output electricity quality is improved, impact on a power grid is reduced, and system efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of solar power generation, in particular to an energy storage method and device for a solar dish Stirling system. Background technique [0002] The total global solar radiation is about 1.7×10 17 W, of which my country accounts for about 1% (1.8×10 15 W, equivalent to 1.9 trillion tons of standard coal per year), is 680 times the current total annual energy consumption in my country. Electricity is the most consumed secondary energy in the world. Solar power generation technology is an effective means to alleviate the current energy crisis and has a broad application prospect. [0003] Solar power generation technologies are mainly divided into two categories: photovoltaic power generation and photothermal power generation. Photovoltaic power generation mainly uses the photoelectric effect of photovoltaic panels to generate electricity. There are currently three main disadvantages in this technology: (1)...

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the problem that the power output of the existing dish-type system is unstable, which affects the quality of grid electricity, and the system has to stop running after the sun rises and sets, and proposes an energy storage method for a solar dish-type Stirling system and its device, stabilize the operating conditions of the system, and delay the operating time

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