Device and method for industrially processing nitrogen-containing waste gas

Abstract

A device and method for industrially treating nitrogen-containing waste gas, the device includes a sodium hydroxide liquid mixing tank, a sodium thiosulfate liquid mixing tank, a chemical tank, and a three-stage washing tower; the sodium hydroxide liquid mixing tank, sulfur The sodium sulfide dosing pool is communicated with the medicament pool by pipeline respectively; The sidewall of described medicament pool is provided with the discharge pipe that is connected with three-stage washing tower, and the lower end of described three-stage washing tower is provided with drainpipe, upper end A gas outlet pipe is provided, and a waste gas feed pipe is provided on the lower side wall; a water circulation system is provided on the three-stage washing tower. It has the advantages of reducing the precipitation of S particles to block the washing tower, reducing white smoke emission, reducing environmental pollution, no need for peripheral equipment to provide working pressure, less chemical agent usage, and lower processing costs.

Description

technical field [0001] The invention relates to the technical field of solar battery waste gas treatment, in particular to an industrial treatment device and method for nitrogen-containing waste gas. Background technique [0002] Solar cell enterprises produce fluorine-containing and nitrogen-containing acid-base waste gas in the process of etching silicon wafers, which is difficult to deal with. For the original waste gas treatment, caustic soda, ammonia water and sodium sulfide are directly added to the circulating water pool, and the pump passes through the 1st-stage washing tower and 3-layer built-in nozzle spray. The shower reacts with the exhaust gas extracted by the centrifugal fan, and the PP filler is used to increase the reaction area and reaction time; the specific process diagram is attached figure 1 As shown, the reaction principle and equation are as follows: [0003] HF+NaOH=NaF+H 2 O NO 2 +Na 2 S=4NaNO 3 +4NaNO 2 +4S+N 2 ↑ [0004] HCl+NaOH=NaCl+H 2 ...

AI Technical Summary

Problems solved by technology

[0010] Using the above structure, prepare sodium hydroxide and sodium thiosulfate solutions in the sodium hydroxide liquid mixing pool and sodium thiosulfate liquid mixing pool respectively, and then the two solutions enter the chemical pool and connect with the three-stage washing tower The discharge pipe enters the three-stage scrubber to scrub the exhaust gas entering from the position near the lower side wall, 4NO 2 +2Na 2 S 2 o 3 +4NaOH=2N 2 +4Na 2 SO 4 +2H 2 O, no solid S is produced, and N elements are removed; HF+NaOH=NaF+H 2 O effectively solves the problem of excessive smoke exhaust, F element removal

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