Device and method for removing nitrogen oxides from hexanedioic acid tail gas

Abstract

The invention discloses a device for removing nitrogen oxides from hexanedioic acid tail gas. The device comprises a diluting unit, a first reaction unit and a second reaction unit, wherein the diluting unit comprises a gas-liquid separator, a compressed air diluting container and a first concentration online analyzer which are connected in sequence through a pipeline; the first reaction unit comprises a charging preheater, a heating device, a first reaction device and a gas / gas heat exchanger which are connected in sequence through a pipeline; the second reaction unit comprises a mixing system, a second concentration online analyzer, a second reaction device, a third concentration online analyzer and a heat recycling device which are connected in sequence through a pipeline; the tops of the first reaction device and the second reaction device are provided with a plurality of insertion type thermometers; each thermometer is provided with a plurality of temperature measuring points from top to bottom on a catalyst bed. By adopting the device, a catalyst can run stably for a long time in a high-temperature acid environment, the reaction activity of the catalyst bed is kept, the removing rate of nitrogen monoxide is 98 percent or more, and the removing rates of nitrogen dioxide and nitrogen monoxide are 95 percent or more.

Description

[0001] Technical field: [0002] The invention relates to a tail gas treatment device and method, in particular to a device and method for removing nitrogen oxides in adipic acid tail gas, belonging to the technical field of adipic acid production. [0003] Background technique: [0004] In the production process of adipic acid, the production process of nitric acid catalytic oxidation of cyclohexanol is widely used, and a large amount of nitrous gas will inevitably be produced in this production process. The tail gas components produced by adipic acid mainly include: nitrous oxide 38%V / V, nitrogen 54%V / V, and residual oxygen, carbon oxides, water vapor, NO X and other mixed acid gases. About 0.27t of nitrous oxide, 700ppm of nitrogen dioxide and 1000ppm of nitrogen monoxide are produced for every 1t of adipic acid produced. By the end of 2015, the domestic production capacity of adipic acid was about 2.5 million tons, and the annual production of nitrous oxide was about 675,...

AI Technical Summary

Problems solved by technology

[0005] Although the nitrous gas in the tail gas of adipic acid is recycled and utilized in post-processes such as the nitric acid absorption tower of the adipic acid plant, the non-recoverable nitrous oxide gas is basically directly discharged into the atmosphere after being diluted with air. Atmospheric environment wreaks havoc

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