A combined solar and geothermal energy assisted carbon dioxide capture system

Abstract

The invention discloses a carbon dioxide capture system assisted by the combination of solar energy and geothermal energy. The system is mainly composed of a power plant generations system, a carbon dioxide capture system, a solar energy collector system and a geothermal energy system. Carbon dioxide in power plant flue gas is removed through the carbon dioxide capture system, and heat needed by a reboiler in the carbon dioxide capture system is provided by the combination of solar energy and geothermal energy; on the condition that solar energy is sufficient in the daytime, the heat of the reboiler is provided by the solar energy collector system; when solar energy is insufficient or at night, and the heat needed by the reboiler is provided with geothermal energy; by coupling solar energy and geothermal energy, stable operation of the capture system is achieved, reduction of output power caused by steam extraction of a power plant is relieved, defects caused by defects of renewable energy sources in the renewable energy source utilization process are overcome, the dual effects of carbon dioxide capture and renewable energy source emission reduction are achieved, and integrated development of renewable energy sources and a traditional power system is promoted.

Description

technical field [0001] The invention relates to a carbon dioxide capture technology combined with solar energy and geothermal energy, specifically relates to the integration of medium and low temperature solar energy and geothermal energy with a carbon dioxide capture system in flue gas, and uses solar energy and geothermal energy to jointly provide energy compensation for the carbon dioxide capture system. In order to reduce the impact of solar intermittency on the capture system, and effectively reduce the efficiency drop caused by steam extraction in the power plant. Background technique [0002] Carbon dioxide capture and storage (CCS) is one of the most promising solutions to address climate change. CO produced by human activities 2 Sources of emissions, the power generation industry dominated by thermal power plants and other energy conversion industries accounted for 40% of the total emissions, steel, cement and other industrial industries accounted for 25.8%, these ...

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Problems solved by technology

[0003] Currently in CO 2 In terms of capture, the most researched and adopted method is the alcohol amine method (MEA method), which has been used in coal-fired power plants for engineering demonstrations. However, due to the combination of alcohol amine chemical absorbents and CO 2 The bonding force between them is strong, so water is required to consume a lot of heat energy during regeneration. The energy source of the existing technology is mainly steam extraction from the medium and low pressure cylinders of the steam turbine in the power plant.

[0004] As a renewable clean energy, solar energy has abundant reserves and great potential for development and utilization. However, the intermittent nature of solar energy causes system instability. In order to ensure reliable utilization of solar energy, heat storage or other auxiliary systems are generally required for auxiliary utilization. , but the use of auxiliary systems increases the cost of the system

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