A two-sodium tail gas purification device and its purification method

Abstract

The invention relates to a two-sodium tail gas purification device and a purification method thereof, which includes a tail gas discharge device, a washing tower, a mist collector, a dust collector, a heat exchanger, an electric heater, a reducing gas discharge device, an ammonia reduction reactor and an exhaust gas discharge device. Gas device, tail gas discharge device, scrubber, mist catcher, and dust collector are connected in sequence. The outlet of the dust collector is connected to the shell-side inlet of the heat exchanger, and the shell-side outlet of the heat exchanger is connected to the inlet of the ammonia reduction reactor. The gas discharge device is connected to the inlet of the ammonia reduction reactor, the outlet of the ammonia reduction reactor is connected to the tube side inlet of the heat exchanger, and the tube side outlet of the heat exchanger is connected to the exhaust device; a catalyst layer is arranged in the ammonia reduction reactor . The invention has reasonable structural design, good treatment effect of two-sodium tail gas, and the discharged nitrogen oxide concentration is far lower than the national standard; using a heat exchanger, there is no need to heat the gas before the reaction, which saves energy; the catalyst layer is cleaned by desalinated water, Catalyst regeneration can be achieved.

Description

technical field [0001] The invention relates to a two-sodium tail gas purification device and a purification method thereof, which are used for removing sodium salts in the two-sodium tail gas. Background technique [0002] Two sodium refers to sodium nitrate and sodium nitrite. The exhaust gas produced during the production of two sodium has relatively low temperature, high water content, relatively high carbon dioxide content, and contains a certain concentration of sodium salts (including sodium nitrate, sodium nitrite and Sodium carbonate, etc.) particles, the commonly used dilute nitric acid plant tail gas purification catalyst is not suitable for the purification of di-sodium tail gas. [0003] In the Chinese utility model manual whose authorized announcement number is CN202527071U, an ammonia reduction reactor for treating tail gas in the production process of nitric acid and disodium is disclosed. Two sections, with an exhaust outlet on the top. In the prior art, a...

AI Technical Summary

Problems solved by technology

In the prior art, ammonia gas needs to be added to treat tail gas through the ammonia reduction reactor. Since ammonia gas is generally made from synthetic ammonia, the price is high, resulting in a very high cost of reducing waste gas with ammonia gas.

Moreover, the gas needs to be heated to a certain temperature before entering the ammonia reduction reactor, which wastes energy if used for a long time; there are no relevant tail gas and waste water treatment methods and catalyst maintenance methods in the documents.

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