Exhaust gas catalytic incineration treatment system and its adjustment and control method

Abstract

The invention relates to an exhaust gas catalytic incineration treatment system suitable for treating volatile organic tail gas and its adjustment and control method. The system includes a preheating device for heating exhaust gas, a first-stage catalytic oxidation reactor for catalytic oxidation reaction, and a One-stage heat recovery device for heat recovery and utilization of exhaust gas after one-stage catalytic oxygen reaction, two-stage catalytic oxidation reactor for catalytic oxidation reaction, two-stage heat recovery for heat recovery and utilization of exhaust gas after two-stage catalytic oxygen reaction A device, a selective catalytic reduction reactor for performing a selective catalytic reduction reaction on the exhaust gas after the second-stage catalytic oxidation reaction to eliminate nitrogen oxides, the method is adjusted by adjusting the relevant bypass flow and supplementary air volume. The invention is suitable for the treatment of waste gas containing volatile organic compounds and nitrogen oxides, such as the tail gas of an acrylonitrile absorption tower, and helps to reduce energy consumption, facilitate operation and reduce nitrogen oxide emissions.

Description

Technical field[0001]The invention relates to an exhaust gas catalytic incineration treatment system, and also relates to an adjustment and control method of the exhaust gas treatment system. The exhaust gas treatment system is suitable for processing volatile organic compound tail gas, belongs to the technical field of pollution control, and is mainly suitable for acrylonitrile absorption tower tail gas Treatment of waste gas containing volatile organic compounds and nitrogen oxides.Background technique[0002]In the chemical production process, many main production processes will produce tail gas containing a large amount of volatile organic compounds, which will cause very serious pollution to the atmospheric environment. For example, the acrylonitrile production process uses propylene ammoxidation technology, using propylene and ammonia as the main raw materials, reacting to produce acrylonitrile and other by-products under the action of a catalyst, and then undergoing rapid cooli...

AI Technical Summary

Problems solved by technology

Under the existing technology, for the propylene purity of 98% and below, if the traditional process is used, a large amount of dilution air needs to be supplemented for cooling. Even so, the temperature in the catalyst reactor is still very high, close to the limit use temperature of the material

At the same time, due to the supplement of a large amount of dilution air, the power of the air supply fan is large and due to the limitation of the efficiency of the plate heat exchanger, a large amount of hot air is discharged into the chimney, wasting heat energy in vain

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