Method and apparatus for circulating, desorbing, shunting, recovering, and reclaiming hot gas by using adsorption bed

Abstract

The invention belongs to the field of chemical separation and environment protection, and specifically relates to a method for circulating, desorbing, shunting, recovering, and reclaiming hot gas by using an adsorption bed. According to the present invention, a combined technology is adopted, that hot gas is circulated and desorbed by an adsorption bed, part of the desorbed gas is processed through bypass heat exchange, and the desorbed gas is condensed and recovered. With the method and the apparatus provided by the present invention, hot gas reclaiming procedures are carried out economically and effectively with the absorption bed. In prior arts, the energy consumption during hot gas desorbing is high, and the cost of hot exchange equipment is high. With the techniques of the present invention, the limitations are solved, and an advantage of hot gas desorbing technology is maintained, that organic matters recovered with a hot gas desorbing technology have relatively pure quality. The method and the apparatus provided by the present invention can be applied in the occasions of chemical adsorption separation, polluted gas purification, and organic solvents recovery. The method and the apparatus are especially suitable for the recovery of continuously discharged organic tail gas with a large total discharge amount. The recovery rate is higher than 90%.

Description

technical field [0001] The invention belongs to the technical fields of chemical separation and environmental protection, and in particular relates to a method and a device for recycling, desorbing, splitting, recovering and regenerating an adsorption bed. Background technique [0002] Adsorption is a traditional separation technology widely used in chemical industry, environmental protection and other fields. The desorption recovery in the adsorption process is one of the cores of the whole process. Traditional desorption methods include water vapor, hot gas desorption, pressure swing desorption, and solvent replacement. In recent years, new desorption methods such as electrothermal method, oxidation regeneration method, and ultrasonic regeneration method have emerged. [1，2] . The water vapor and hot gas desorption method is suitable for the desorption of low-molecular hydrocarbons with low boiling points and saturated carbon of aromatic organic substances. The enthalpy o...

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Problems solved by technology

However, when heated directly, hot spots will appear on the contact surface of granular activated carbon, which will affect the control of the temperature of the adsorption bed, and it is difficult to scale up. In addition, further research is needed on the connection and insulation of the electrodes. [5，6]

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