Purification assembly technique of nitrous oxides in air

Abstract

The present invention provides a technology for purifying and combining nitrogen oxide in air. Wood chips with the size less than 2mm are washed, then are dipped in alkali activated solution with 2 percent to 10 percent of KOH or 2 percent to 10 percent of NaOH for more than 24 hours and then are dried under the temperature of 150 DEG C to be made into a wooden chip filling which is filled in a filling column to form a filling bed. The air containing the nitrogen oxide to be disposed is processed by preoxidation treatment by an ozone generator which controls the ozone concentration to be 1 percent, the air enters from the bottom of the filling column, flows through the filling bed and is exhausted from the top of the filling column after being detected by a nitrogen oxide detector. The upper part of the filling bed is provided with an atomization spray device for atomizing and spraying the filling bed periodically, the atomizing quantity is 800-1000ml / h, and the effective distance is 1m. Interim spray is controlled by an electromagnetic valve according to temperature, humidity or time, and spray liquid can be recycled after being collected. The present invention has simple and convenient operation and good purification effect, is environment-friendly and reduces the cost greatly.

Description

technical field [0001] The present invention relates to the technical field of atmospheric environment protection, more specifically to the technical field of air purification, in particular to a combined process for purifying nitrogen oxides in the air. Background technique [0002] Regarding the purification method of nitrogen oxides in the air, the purification efficiency of the traditional selective catalytic reduction (SCR) method is generally 70%-90%, but there are high investment and operating costs, consumption of ammonia liquid, and nitrogen oxides cannot be recovered. shortcoming. The principle of non-catalytic selective reduction technology (SNCR) is the same as that of SCR, but it requires a high temperature of 900-1200 ° C, and will consume more ammonia liquid, causing secondary pollution of ammonia liquid leakage. The traditional wet method needs to use an oxidizing agent (such as NaClO, KMnO 4 ) to oxidize insoluble NO to easily absorbed NO 2 , and then abs...

AI Technical Summary

Problems solved by technology

[0002] Regarding the purification method of nitrogen oxides in the air, the purification efficiency of the traditional selective catalytic reduction (SCR) method is generally 70%-90%, but there are high investment and operating costs, consumption of ammonia liquid, and nitrogen oxides cannot be recovered. shortcoming

The principle of non-catalytic selective reduction technology (SNCR) is the same as that of SCR, but it requires a high temperature of 900-1200 ° C, and will consume more ammonia liquid, causing secondary pollution of ammonia liquid leakage

The traditional wet method needs to use an oxidizing agent (such as NaClO, KMnO 4 ) to oxidize insoluble NO to easily absorbed NO 2 , and then absorbed by alkaline liquid absorbent, but it consumes a lot of oxidant and absorbent, and the absorbed product is easy to cause secondary pollution, and sewage treatment equipment must be added, so it is rarely used

Complexation absorption combined with biological conversion of nitrogen oxides technology not only requires the use of Fe(EDTA) solution for absorption, but the use of chelating agent itself puts forward high requirements for equipment. The cost has long been known, and the absorption efficiency is low, generally around 60%

The adsorption method is mostly physical adsorption, and the purpose of removing nitrogen oxides is achieved by changing the temperature or pressure, resulting in large energy consumption, and the concentration of the desorbed gas is low, difficult to recover, and high in cost.

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