Anti-blocking combined process and system for high treatment efficiency of low-concentration VOC tail gas

Abstract

The invention relates to an anti-blocking combined process and system with high treatment efficiency for low-concentration VOC tail gas. The process comprises the following steps of (1) pretreating the low-concentration VOC tail gas; (2) preheating; (3) conducting RTO incineration; (4) conducting high-temperature reverse burning; (5) preheating the tail gas by incinerated flue gas and conducting primary cooling on the flue gas; (6) conducting secondary cooling on the flue gas subjected to primary cooling and cooled and dewatered flue gas; (7) deacidifying the flue gas subjected to secondary cooling; (8) heating and drying the cooled and dewatered flue gas; and (9) adsorbing the flue gas in a zeolite molecular sieve to remove secondary organic matters. According to the process and the system, the waste heat of low-temperature flue gas is recycled, the charging temperature of the waste gas is increased, and the adsorption of high-waste boiling substances in the charging waste gas on a heat storage bed is reduced, so that the desorption of the high-waste boiling substances during flue gas discharge is reduced, meanwhile, the situation that amine organic matter decomposition product ammonia is adsorbed on the heat storage bed and directly enters a hearth to be decomposed is reduced, ammonia sources for synthesis of ammonium salt are reduced, and blockage caused by gathering of ammonium salt particles in a heat storage bed layer is reduced.

Description

Technical field [0001] The present invention relates to a VOC tail gas treatment process and system, in particular to a low-concentration VOC tail gas treatment process and system. Background technique [0002] The exhaust gas from pharmaceutical and pesticide production units generally uses condensation, absorption, adsorption or membrane separation to recover the organic matter. The recovered low-concentration VOC-containing exhaust gas is then treated with a regenerative incinerator (referred to as RTO system) for terminal treatment. The total efficiency of the RTO system in treating organic matter can reach about 99%, so it is widely used for tail gas treatment at the end of pharmaceutical and pesticide production units. [0003] The characteristics of the tail gas at the end of pharmaceutical and pesticide production equipment are complex components, large fluctuations in gas volume and concentration, and highly corrosive flue gases produced by incineration. There are ...

AI Technical Summary

Problems solved by technology

One is that the improvement of removal efficiency is limited, the other is the problem of corrosion, and the third is that the heat storage bed is easily blocked by ammonium salts, which intensifies and limits the improvement of removal efficiency, and the heat storage bed is blocked by ammonium salts, which will cause the environmental protection device to be blocked. Forced parking affects pre-production operation

[0004] Due to the improvement of environmental protection-related norms and requirements, the internal control indicators of various pharmaceutical and pesticide production enterprises have been continuously improved, and with the expansion of the types of exhaust gas included in the incinerator, the total efficiency of the RTO system of 99% has gradually failed to meet the requirements.

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