VOC normal-temperature condensation treatment system and method utilizing static activity of activated carbon

Abstract

The invention discloses a VOC normal-temperature condensation treatment system and a method utilizing static activity of activated carbon, and relates to the technical field of industrial emission VOCs treatment. The VOC normal-temperature condensation treatment system comprises a VOCs pretreatment system, a desorption condensation system, an auxiliary adsorption bed C, an adsorption bed A and anadsorption bed B; the adsorption beds A and B are connected with an adsorption fan through an adsorption air inlet valve; the adsorption fan is connected with the VOCs pretreatment system; the adsorption beds A and B are connected with the atmosphere through adsorption air outlet valves; the adsorption beds A and B are in serial closed connection through series valves Ab and Ba; and two ends of the adsorption bed A, the adsorption bed B and the auxiliary adsorption bed C are respectively connected with two ends of a desorption condensation system through desorption condensation valves. By adopting the treatment method of the system, the static activity of the activated carbon is fully utilized, the cost of the activated carbon is reduced, the service life is prolonged, and the recovered organic solvent is higher in purity and high in recovery efficiency; and a 2 + 1 mode is adopted, so that the control strategy is simpler, and the operation is more reliable.

Description

technical field [0001] The invention relates to the technical field of industrial emission VOCs treatment, in particular to a VOC normal-temperature condensation treatment system and method using activated carbon for static activity. Background technique [0002] Volatile organic compounds (VOCs) in the atmosphere cause serious damage to plant and animal life, and affect human health such as eye irritation, respiratory problems, and cancer. VOCs used as organic solvents in industries such as spraying and furniture can account for 35-40% of atmospheric VOCs emission sources. In the above-mentioned industries, the common treatment methods of VOCs include: recovery methods such as adsorption, absorption, and condensation, and destruction methods such as direct combustion, catalytic oxidation, biological treatment, low-temperature plasma, and photocatalysis; in practical applications, two or more of the above methods are generally combined. three kinds. Among them, the VOCs tr...

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Problems solved by technology

This patent realizes normal temperature condensation while ensuring that the adsorption efficiency reaches the standard, which reduces the process difficulty, equipment cost and operating energy consumption. However, this patent, like other similar patents, only uses the dynamic activity of activated carbon, and has relatively high requirements for the adsorption and desorption performance of activated carbon. High, the adsorption amount is required to be greater than the sum of the condensation residual amount and the dynamic adsorption amount during the auxiliary adsorption, otherwise there will be disadvantages of insufficient transfer and the emission concentration after adsorption purification will not meet the standard

[0005] At this stage, the adsorption, concentration and condensation recovery methods of VOCs generally face the following four problems: deep condensation is required, so the energy consumption of condensation and heating is greatly increased; the system equipment, pipelines and valves are subjected to large temperature differences, resulting in stress loss and difficult air tightness; condensation A part of the VOCs remaining in the final adsorption bed will cause the adsorption efficiency to decrease in the next stage or face the risk of explosion by hot purging with fresh air; only the adsorption kinetic activity of activated carbon is used, and part of the adsorption capacity of activated carbon is wasted

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