Temperature swing adsorption device and method for capturing flue gas carbon dioxide in power plant

Abstract

The invention discloses a temperature swing adsorption device and method for capturing carbon dioxide in flue gas of a power plant, and belongs to the field of flue gas purification of coal-fired power plants. A hot water port of a solar water heater is connected with an inlet of a hot water storage tank, and an outlet of the hot water storage tank is connected with a shell pass of a carbon dioxide heater and a hot water channel of a refrigerator and converged to a cold water return port of the solar water heater through pipelines. An outlet of the refrigerator working medium channel is sequentially connected with the flue gas cooler working medium channel and an inlet of the refrigerator working medium channel, the temperature swing adsorber is sequentially connected with a flue gas cooler shell pass, a shell pass of the winding heat exchanger and a flue gas pipeline, and a tail gas channel of the winding heat exchanger is connected with the temperature swing adsorber. According to the solar water heater, solar heat collection serves as heat driving energy, needed heat can be provided for regeneration of the adsorbent and refrigeration of the refrigerator at the same time, and the energy utilization efficiency of the device is remarkably improved after the cold energy of the system is recycled through the winding heat exchanger.

Description

technical field [0001] The invention belongs to the field of flue gas purification in coal-fired power plants, in particular to a temperature-swing adsorption device and method for capturing flue gas carbon dioxide used in power plants. Background technique [0002] With the process of industrialization, a large amount of fossil fuels are consumed, resulting in an increase in the concentration of carbon dioxide in the atmosphere and global warming. Therefore, the capture of carbon dioxide from flue gas has become an important strategic means to deal with climate change and acid rain pollution. At the same time, recovered carbon dioxide can generate important carbon-containing products through different chemical or biological pathways, with important economic and environmental benefits. The absolute amount of carbon dioxide gas emissions from flue gas from coal-fired power plants accounts for about half of my country's total carbon dioxide gas emissions, and is the most impo...

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Problems solved by technology

However, for the flue gas of coal-fired power plants, the partial pressure of carbon dioxide is very low, the amount of absorbent used in the separation process is large, and the heat consumption of absorbent regeneration will be very large

The heat sources of existing flue gas carbon dioxide capture devices in power plants mostly use power plant exhaust steam and flue gas waste heat as regenerative heat sources, which reduces the power generation efficiency of power plants. At the same time, the limitation of high heat source temperature requirements will further limit the device Scope of application and promotion operation

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