Carbon dioxide circular power generation method adapting to countries with solar energy as energy

Abstract

The invention discloses a carbon dioxide circular power generation method adapting to countries with solar energy as energy. CO2 is used as a working medium; a solar CO2 energy storage device is adopted to convert the solar energy to a high-pressure heat-state supercritical CO2 fluid with high energy storage density; a flow stabilizing adjuster adjusts the high-pressure heat-state supercritical CO2 fluid as an equal-pressure heat-state supercritical CO2 fluid for acting a turbine/piston expander to drive a generator to generate electricity; the solar CO2 energy storage device includes a light collection CO2 energy storage device and a lens energy collecting device; and the method mainly comprises the steps of: (1) CO2 storage and conveying; (2) CO2 energy storage; (3) tempering and power generation of the supercritical CO2 fluid; and (4) CO2 circulation and regeneration utilization. The method has such advantages as convenience to use the solar energy as the energy under complex topography conditions in vast countries with different longitude and latitude conditions, small floor area, no influence on ecological environments of the countries, stable operation, low self energy consumption, low investment and low operating cost.

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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