A kind of using ionic liquid to carry out CO in flue gas 2 Capture device and process

Abstract

The invention discloses a device and process which uses ionic liquid as the circulating absorbent, low-boiling-point organic steam as the circulating steam stripping agent and a supergravity rotary bed as the supergravity regeneration and absorption device to capture and separation CO2 in flue gas. The device comprises a rich and barren solution heat exchanger, a rich solution heater, a supergravity regeneration device, a gas-liquid heat exchanger, a condenser, a gas-liquid separator, a counterbalance valve, a steam generator, a barren solution conveying pump, a barren solution cooler, a supergravity absorption device, a rich solution conveying pump and a foam remover which are connected in a certain manner. The device and process has the advantages that the CO2 in the flue gas can be effective captured and separated, and the device and process is high in decarburization efficiency, low in regeneration energy consumption, low in material consumption, small in equipment size, environmentally friendly and the like and is applicable to the capturing and separation of the CO2 in industrial flue gas of coal fired and gas fired power stations.

Description

technical field [0001] The present invention relates to a kind of using ionic liquid as circulating absorbent, using low-boiling organic steam as circulating stripping agent, adopting high-gravity rotating bed as absorption and desorption equipment, capturing and separating CO from flue gas 2 , and obtain high-purity CO 2 The device and process of product gas. The invention has the advantages of high decarbonization efficiency, low regeneration energy consumption, small equipment volume, and environmental friendliness, and is suitable for CO in industrial process flue gas such as coal-fired power plants and gas-fired power plants. 2 capture separation. Background technique [0002] Coal-fired power plant flue gas and a large amount of CO emitted by other industrial fields 2 , is considered to be an important factor affecting global climate change, controlling CO 2 Gas emissions and mitigation of climate change have become an important part of my country's sustainable dev...

AI Technical Summary

Problems solved by technology

However, these traditional regeneration methods are not suitable for CO2 regeneration using ionic liquids. 2 capture process

On the one hand, ionic liquids are non-aqueous absorbents composed of ionized anions and cations, which themselves have very low vapor pressure and are almost non-volatile, so they cannot pass through the reboiler process in traditional hot potash or organic amine absorbent methods. Generating steam as stripping gas

However, the steam stripping method is used to directly purge and regenerate. Part of the water vapor will condense in the ionic liquid, which will reduce the trapping effect of the absorbent in the absorption unit, and at the same time, greatly increase the energy consumption of the entire process.

On the other hand, compared with aqueous solution absorbents, ionic liquids usually have higher viscosity, and their flow is slow or even difficult to flow in traditional tower equipment, the effect of mass transfer and heat transfer is poor, the regeneration efficiency is low, and the energy consumption is low. high

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