Exhaust gas catalytic incineration treatment system and adjusting and controlling method thereof

Abstract

The invention relates to an exhaust gas catalytic incineration treatment system and an adjusting and controlling method thereof suitable for the treatment of volatile organic exhaust gas. The system comprises a pre-heating device for heating the exhaust gas, a first-stage catalytic oxidation reactor for catalyzing oxidation reaction, a first-stage heat recovery device for the heat recovery of theexhaust gas after the first-stage catalytic oxygen reaction, a second-stage catalytic oxidation reactor for the catalytic oxidation reaction, a second-stage heat recovery device for the exhaust gas heat recovery after the second-stage catalytic oxygen reaction, and a selective catalytic reduction reaction for conducting selective catalytic reduction reaction on the exhaust gases after the second-stage catalytic oxidation reaction so as to eliminate nitrogen oxides. The method achieves adjusting by adjusting the relevant bypass flow and supplementary air volume. The invention is adapted to thetreatment of the exhaust gas containing volatile organic compounds and nitrogen oxides such as the exhaust gas of an acrylonitrile absorption tower, the energy consumption is reduced advantageously, the operation is facilitated, and the emission of nitrogen oxides is reduced.

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 r...

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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