Treatment system and technology for nitrate production tail gas

Abstract

The invention belongs to the technical field of tail gas treatment and particularly relates to a treatment system and technology for nitrate production tail gas. The treatment system for the nitrate production tail gas comprises a first-level static demister, a second-level static demister, a first-level preheater and a reducer which are communicated in sequence. Separation is conducted through the multi-level static demisters of different running voltages, the content of impurities in the nitrate production tail gas is gradually lowered, the effect of separating substances such as sodium nitrate and sodium nitrite from moisture and gas is guaranteed, the effect of removing the impurities is stable and reliable, and it is guaranteed that the gas meets the requirements of following workingsegments.

Description

technical field [0001] The invention belongs to the technical field of tail gas treatment, and in particular relates to a treatment system and a treatment process for tail gas from nitrate production. Background technique [0002] The production process of sodium nitrate and sodium nitrite will produce a large amount of tail gas. At present, the ammonia reduction catalytic process is generally used for treatment. Under the action of the catalyst, nitrogen oxides and ammonia undergo catalytic reduction reaction of these tail gases to obtain nitrogen gas, so that the tail gas reaches the national emission standards. [0003] However, in the actual production process, before the nitrate production tail gas enters the catalyst layer, the droplets containing solutes such as sodium nitrate, sodium nitrite and sodium carbonate must be pretreated, otherwise, when the droplets containing the above solutes enter Catalyst layer, after dehydration of the droplets, the outer surface of ...

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Problems solved by technology

[0005] The washing method has the following disadvantages: 1. During the circulation of the washing liquid, the temperature of the mixed gas will be reduced, which increases the energy consumption in the subsequent processing section; 2. When the system pressure changes, it may cause gas carryover in the subsequent processing section. 3. The washing method itself has disadvantages. When the washing liquid is in contact with the mixed gas, the entrainment of liquid droplets in the gas is very serious, and the gas quality in the subsequent sections cannot meet the requirements, resulting in shortened service life of the catalyst. Generally, it takes 2 to 3 months to wash and regenerate the catalyst, which increases the production cost, reduces the stability of the catalytic reaction, and greatly increases the risk of environmental protection.

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