Cleaning device for ammonia-containing waste gas

Abstract

The invention relates to a cleaning device for ammonia-containing waste gas. The cleaning device comprises a heater, a cyclone separator, a condenser and an absorption tower which are connected in order. The ammonia-containing waste gas is firstly fed into the heater, then is fed into the separator, the condenser and the absorption tower in order, and is discharged from the tower top of the absorption tower. The ratio of the height to the diameter of the absorption tower is 10:1. The adsorption tower comprises an adsorption liquid tank at the bottom, and three spraying layers at the upper part of the absorption tower. Filler layers are disposed below the spraying layers. The ratio of the total thickness of the spraying layers to the total thickness of the filer layers is 1:6.3. Raschig rings are adopted as a filler in the filler layers. A circulating pump is connected to the absorption liquid tank (5) and the spraying layers. A sulfur acid solution is adopted as an absorption liquid. The cleaning device is suitable for cleaning ammonia-containing waste gas produced in a fertilizer production workshop and is high in cleaning efficiency, simple in structure, easy to operate and good in economical efficiency.

Description

technical field [0001] The invention relates to the field of factory waste gas purification, in particular to a purification device for ammonia-containing waste gas in a fertilizer plant. Background technique [0002] Fertilizer production workshops produce a large amount of ammonia-containing waste gas, which causes stench near the factory and is one of the root causes of environmental degradation. Usually, the treatment methods of ammonia-containing waste gas are: absorption method and decomposition method. The former is mainly to absorb ammonia-containing waste gas with water or dilute acid solution (sulfuric acid or hydrochloric acid) to convert it into ammonia water, ammonium sulfate or ammonium chloride. Due to the restriction of the use of ammonia water, most enterprises adopt dilute sulfuric acid solution absorption method and concentrate by evaporation 1. Cooling and crystallization to separate ammonium sulfate crystals as raw materials for the production of compou...

AI Technical Summary

Problems solved by technology

The latter decomposition method mainly decomposes ammonia into nitrogen and hydrogen through the action of a catalyst. However, the processing cost of this method is relatively high, and there are not many manufacturers using it.

It is understood that some companies currently use the second-stage spray absorption method of clear water to absorb waste ammonia gas, and then use denitrification technology to decompose ammonium. Due to the influence of weak biological treatment capacity and high treatment costs, the circulating absorption liquid cannot be fully effective. ground treatment, and after repeated circulation, the high-temperature exhaust gas heats up the absorption liquid, causing the ammonia gas dissolved in the absorption liquid to be decomposed, causing secondary pollution

Images