A kind of activated carbon differential adsorption safe concentration method

Abstract

The invention discloses an active carbon differential adsorption safe concentration method. Active carbon is adopted by an adsorption device for adsorption, and the adsorption device comprises a mainadsorption device and an auxiliary adsorption device; insert gas protection such as nitrogen gas protection is adopted for increasing of the safety of the main adsorption device in desorption, the nitrogen gas temperature of the main adsorption device is increased to improve active carbon regeneration effect, and reduce residual activity after material desorption; after desorption, discharged nitrogen containing high concentration organic matters is subjected to appropriate cooling, and is subjected to adsorption purifying using the auxiliary adsorption device so as to form an inert purge gasrelatively low in concentration for high temperature desorption of the main adsorption device, and deep desorption of the main desorption device is realized. The adsorption device is invented based onadsorption balance characteristics, is composed of the main adsorption device and the auxiliary adsorption device, differential adsorption concentration and the continue effect of the auxiliary adsorption device are adopted, so that full regeneration of the main adsorption device is realized with ensured safety, and the adsorption purifying efficiency of the main adsorption device is ensured.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, relates to gas purification technology, and in particular to a safe concentration method of active carbon differential adsorption. Background technique [0002] Adsorption and concentration is an important means of purifying volatile organic gases. At present, the adsorption, concentration and heating oxidation process has become the main technical route for the purification of low-concentration and high-volume organic gases. Since the adsorption concentration heating oxidation process usually uses hot air for desorption, when the adsorbent is a flammable activated carbon material, if the desorption hot air exceeds 100 ° C, it is easy to cause a fire safety problem. Existing reports have shown that in the concentrated heating oxidation process using honeycomb activated carbon as the adsorption material, when air with a temperature higher than 100°C is used for desorption and rege...

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Problems solved by technology

[0003] From the perspective of safety, the current method is to change the adsorbent in the concentration stage into a hydrophobic zeolite molecular sieve runner. Since the zeolite molecular sieve itself is not flammable, even if smoldering occurs, its harm is less than that of carbon bed combustion. Therefore, the facility It solves the problem of concentration of low-concentration and high-volume gas, but the equipment investment is large, the manufacturing process is long, the technical requirements are high, the number of suppliers worldwide is very limited, the delivery cycle is long, and the zeolite conversion Wheel enrichment is mainly suitable for continuous operation conditions. It requires high-temperature air (above 160°C, usually 180°C to 220°C) for purging and desorption. It has high requirements for desorption heat sources and often needs to be burned to generate high-temperature gas. The application in some fire-proof areas is limited, and because the overall capacity of zeolite molecular sieve is relatively small, it is not suitable for discontinuous, especially organic gas purification with large concentration fluctuation range

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