Adsorption purification unit and adsorption recycling device for recycling organic solvent from waste gas

Abstract

The invention relates to an adsorption purification unit for recycling organic solvent from waste gas, comprising a shell and an active carbon bed layer filled in the shell, the side wall of the shell is provided with an air inlet and an air outlet, the two ends of the active carbon bed layer are provided with electrodes, an elastic compacting device is arranged between the shell and the active carbon bed layer, the active carbon bed layer is internally provided with electric couplers, and the electrodes and the electric couplers are respectively connected with an electrothermal controllers. In the invention, granular active carbon is adopted as adsorbent, the loading density is high, the adsorption capacity is high, the work cycle is long, the loss caused by loading density of activated carbon fibers and frequent adsorption-desorption switching on equipment can be avoided, the replacement cycle of the adsorbent is long, and the maintenance cost is low; the recycled solvent contains no water, the purity is high, and the quality is high, thus the solvent can be directly recycled for production; no waste water is produced, no secondary pollution is caused, and discharge reaching thestandard can be realized; the energy consumption is low, the operating cost is low, and the adsorption purification unit can be applied to recycling of high-boiling point solvent, thus the application field of solvent recycling equipment is expanded.

Description

[0001] technical field [0002] The invention relates to the treatment of organic waste gas in the field of environmental engineering, in particular to an adsorption purification unit and an adsorption recovery device for recovering organic solvents from waste gas. Background technique [0003] The generation and harm of organic waste gas. Organic waste gas is generally produced in modern industrial production and manufacturing processes, such as flexible packaging printing, synthetic leather, synthetic fiber and synthetic resin, automobile and motorcycle coating and other industries. my country is a big printing country, and the printing industry alone uses more than 10 million tons of organic solvents every year. The direct discharge of organic waste gas not only makes the air quality of the production workshop very bad, but also causes serious pollution to the environment around the factory area, endangering the health of production workers and the surrounding people, an...

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Problems solved by technology

[0010] However, this technology uses activated carbon fiber as the adsorbent, and the inherent disadvantages of the adsorbent itself still exist. If the electrothermal technology can be applied to the electric heating of granular activated carbon, under the condition of power on, the resistance generated by the activated carbon particle itself and the contact resistance between carbon particles will be used. It is a more ideal technology to realize the regeneration of the adsorbent by heat, but there are great difficulties. The reason is that granular activated carbon is a rigid material and needs to be filled with an adsorption bed before it can be used. Generally, granular activated carbon is filled in metal or non- In the shell made of metal, the adsorption bed is made. Since the expansion coefficient of the shell material of the adsorption bed is inconsistent with that of the internal filling material during the electrothermal process, after repeated heating by electric heating, the accumulation structure of the granular activated carbon changes and the bed becomes loose. Not only channeling occurs when the air flow passes through, resulting in a decrease in purification efficiency, but more seriously, the contact resistance is uneven, and the bed is partially overheated when the power is turned on, which may damage or burn the activated carbon, and destroy the bed structure, or generate sparks, resulting in solvent-containing The adsorption bed explodes and burns, posing a serious safety hazard

Due to the difficulty of solving the self-compacting problem of the granular activated carbon bed, the electrothermal regeneration technology is still in the laboratory research stage, and has not realized engineering application.

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