Solar heat and power cogeneration system and method

Abstract

The invention discloses a solar heat and power cogeneration system and method. The system comprises a tower type solar heat collector, a voltage stabilizer, a three-way valve, a heat accumulator, a circulating water pump, a steam generator, an expansion machine, a power generator, a condenser and a water feeding pump. The method comprises the following steps that when sunlight is sufficient in the daytime, a heat collector is adopted for absorbing solar radiation energy, circulating water is heated, and part of energy is stored in a heat accumulator; the energy of the heat storage working medium in the heat accumulator is used as a heat source to heat circulating water in the night or rainy days; in the steam generator, high-temperature circulating water is used for heating secondary loop feed water to form steam, the steam pushes blades of the expansion machine to do work and generates electric energy through the generator, and after steam exhausted by the expansion machine is subjected to heat exchange through the condenser, residual available energy is supplied to a heat user, so that heat and power cogeneration is realized. The system is small in scale and low in investment cost, the method is high in flexibility, the capacity can be fully utilized in a combined heat and power supply mode, and the high energy utilization rate is guaranteed.

Description

technical field [0001] The invention relates to a solar heat and power cogeneration system and method, belonging to the technical fields of solar energy, energy storage and heat supply. Background technique [0002] With the development of science and technology, the demand for electric energy in human life is also increasing, and the requirements for the quality of electric energy are also constantly improving. As a clean, efficient and inexhaustible energy source, solar energy has become one of the effective ways to solve economic, environmental, energy and other problems. Great developments and breakthroughs have been made in the use of solar energy in households. However, solar energy also has disadvantages such as low energy flow density and strong instability. It is limited by natural conditions such as day and night, seasons, geographical latitude and altitude, and is affected by random factors such as weather. In order to make solar energy a continuous and stable e...

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Problems solved by technology

At present, energy storage is one of the weaker links in solar energy utilization. The Chinese invention patent with application number 201710304575.6 proposes a tower-type solar power generation combined heat and power system, which uses a secondary heat storage system to realize the step-by-step conversion of solar energy. However, the system is relatively complicated and the investment cost is relatively high; the Chinese invention patent with application number 201820428944.2 proposes a solar cogeneration system based on supercritical CO2 Brayton cycle, which effectively utilizes the heat of the working fluid at the outlet of the expansion part , but because the system uses supercritical CO2 as the working fluid, the compressor consumes a lot of power and the system efficiency is low

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