Low-carbon heat recovery and capture device

Abstract

The low-carbon heat recovery and capture device at least comprises an organic Rankine cycle power generation system, a CO2 recovery system, an LNG cold energy heat regeneration system, a low-pressure water vapor heat exchange system and a CO2 capture system. According to the embodiment of the invention, low-grade heat of low-pressure water vapor and regenerated gas can be fully recovered, and a large amount of low-grade heat is obtained through an organic working medium and converted into electric energy; meanwhile, a gradient utilization process of energy is designed, cold energy of liquefied natural gas is effectively utilized, a part of low-grade heat is converted into electric energy through the gradient utilization process of the energy, the rest of heat is finally converted into sensible heat of the natural gas, and domestic gas with appropriate temperature and pressure is provided for cities.

Description

technical field [0001] The invention relates to the technical field of carbon capture and energy saving, in particular to a low-carbon heat recovery and capture device. Background technique [0002] The consumption of fossil energy will generate a large amount of carbon dioxide. With the increasing consumption of fossil energy, more and more carbon dioxide is discharged into the atmosphere, which makes the concentration of carbon dioxide in the atmosphere continue to increase. [0003] The emission reduction of carbon dioxide mainly includes improving energy efficiency, using new energy sources and technologies such as carbon dioxide capture. Among them, the post-combustion carbon dioxide capture technology is the most effective carbon dioxide emission reduction method for the flue gas of coal-fired power plants, the largest source of carbon dioxide emissions in the world. Among the traditional carbon dioxide capture technologies after combustion of flue gas, the most widel...

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Problems solved by technology

However, in the state of low (normal) pressure, the boiling point of the alcohol amine rich liquid that has absorbed carbon dioxide is low, which makes the rate of regeneration reaction low on the one hand, making the residence time required for the regeneration of the rich liquid longer, on the other hand , the water content in the gas regenerated under normal pressure is high, so that a large amount of heat is used for the gasification of water, which reduces the heat utilization efficiency of the system, and makes the process of capturing carbon dioxide in the flue gas consume a lot of energy, which cannot meet the requirements industrial production needs

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