Treatment method for nitrogen oxide tail gas discharged from industrial production furnace, and apparatus thereof

Abstract

The present invention discloses a treatment method for nitrogen oxide tail gas discharged from an industrial production furnace, and an apparatus thereof. According to the present invention, gas generated from the furnace is connected to a self-sucking type gas-liquid mixing device through a pipeline to carry out a treatment on the furnace tail gas; the treated gas is discharged by using a gas exhaust tube with the pressure provided by the self-sucking type gas-liquid mixing device. The apparatus of the present invention comprises the self-sucking type gas-liquid mixing device, an absorption liquid cooling system and an absorption liquid settlement system. Compared to the prior art, with the method and the apparatus of the present invention, the nitrogen oxide tail gas discharged from the industrial production furnace can be effectively treated, the cost is low, the process is simple, and the operation can be stably performed for a long period.

Description

technical field [0001] The invention relates to a waste gas treatment method and device, in particular to a treatment method and device for industrial production kiln nitrogen oxide tail gas. Background technique [0002] Industrial production kilns often emit a large amount of exhaust gas containing nitrogen oxides, the main components of which are nitrogen monoxide (NO), nitrous oxide (N 2 O), nitrogen dioxide (NO 2 ), etc., are one of the main air pollutants that are restricted by the state. In particular, the exhaust gas emitted from catalyst production kilns has a high concentration of nitrogen oxides and a brownish-red or brownish-yellow color, which is extremely harmful to the environment and human health. For example, when metal and nitric acid (concentrated nitric acid or dilute nitric acid) are used to produce catalysts or metal nitrates are used as raw materials, the kiln will emit exhaust gas containing nitrogen oxides during the catalyst drying, roasting and a...

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Problems solved by technology

(2) Displacement fluctuates greatly

When the amount of waste gas generated is large and the processing capacity of the waste gas treatment device is small, the exhaust gas of the kiln will leak and cause damage to the health of the operators

When the amount of exhaust gas produced is small and the processing capacity of the exhaust gas treatment device is large, the catalyst powder will enter the exhaust gas treatment device through the pipeline and be lost, the catalyst yield will decrease, and at the same time, it will cause great harm to the normal operation of the exhaust gas treatment device

(3) The dust content is high, the dust particle size is small, and it is difficult to remove

Since some catalysts are roasted in a powder state, the particle size of the dust is very small, and it is difficult to completely remove it by conventional bag dust removal and cyclone dust removal. stop in traffic jam

(4) Exhaust gas temperature is high

These two types of equipment have limitations in the waste gas treatment process: the pressure drop of the spray tower is small, the power consumption is small, but the gas-liquid contact surface area is low, and the equipment efficiency is low; in order to provide a larger gas-liquid two-phase The contact area of ​​the liquid must be increased, which will increase the pressure drop, increase the power consumption, and easily cause blockage

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