A method for carbon dioxide cycle power generation using solar energy as energy in rural areas

Abstract

The carbon dioxide cycle power generation method that is suitable for rural areas using solar energy as energy, uses CO2 as the working medium, and uses solar CO2 energy storage devices to convert solar energy into high-pressure thermal supercritical CO2 fluid with high energy storage density, which is adjusted by a steady flow regulator It is an isobaric thermal supercritical CO2 fluid, which is used by a turbine / piston expander to drive a generator to generate electricity. The solar CO2 energy storage device includes a light-collecting CO2 energy storage device and a lens energy-concentrating device, which mainly includes the following steps: ( 1) CO2 storage and transportation; (2) CO2 energy storage; (3) Supercritical CO2 fluid conditioning and power generation; (4) CO2 cycle and heat recovery utilization. The invention is convenient for vast villages with different latitude and longitude conditions, uses solar energy as energy source under complex topography and landform conditions, and occupies a small area without affecting the ecological environment of the village. Etc.

Description

technical field [0001] The invention relates to the field of low-carbon and energy technologies, in particular to a CO 2 as a working medium, suitable for rural CO with solar energy as energy 2 The method of cycle power generation. Background technique [0002] Climate change has become one of the issues that affect human survival and development, and a large amount of carbon dioxide emissions are considered to be the main cause of climate warming. As the largest developing country in the world, coal-based primary energy and firepower The secondary energy structure dominated by power generation, with the rapid growth of economic aggregate, the CO of primary energy and secondary energy 2 Emissions are characterized by rapid growth and large volumes. In response to climate change, the development of low-carbon energy, especially renewable energy and new energy, has become a consensus. Solar power generation and supercritical carbon dioxide power generation have attracted wid...

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Problems solved by technology

[0004] In terms of solar power generation, the solar power generation system using water as the working medium has been maturely applied, and the CO 2 Technical workers at home and abroad have also conducted a lot of research on the solar power generation system as the working medium. The more mature solar heat collection system schemes adopted are trough solar collectors, tower solar collectors, and dish solar collectors. However, there are three basic problems that are difficult to solve in the above-mentioned schemes. First, it takes up a lot of space and investment, and the construction of solar heat collection systems has high requirements for site selection, which cannot be met by general rural sites. The requirement of building a solar heat collection system, moreover, the large space field of the existing solar heat collection system has a great impact on the ecology, even the birds can't reach it; second, it can only generate electricity during the day and stop at night. For this reason, some researchers Provided a technical solution for storing heat with molten salt and other materials during the day and saving it for power generation at night, but the solution for storing heat with a large amount of molten salt and other materials, regardless of the investment size and feasibility, must be safe for the rural environment and personnel quality Hidden dangers and hidden dangers of environmental pollution; the third is the temperature and pressure changes of the supercritical carbon dioxide supplied to the turbine of the supercritical carbon dioxide power generation system with the intensity of sunlight and the movement of sunlight during the day, resulting in large fluctuations in output power, voltage and current, and excessive frequency The output power and the fluctuation of voltage and current will be extremely unfavorable to domestic and production electricity consumption.

[0005] In summary, the existing types of CO using solar energy as energy 2 Most of the power generation methods do not match the vast rural conditions. In view of this, there is an urgent need to develop a supercritical CO 2 method of generating electricity

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