Device and method for reducing concentration of nitrogen oxide in discharged tail gas of explosive powder production line

Abstract

The invention discloses a device and method for reducing the concentration of nitrogen oxide in the discharged tail gas of an explosives powder production line. According to the device for reducing the concentration of nitrogen oxide in the discharged tail gas of the explosives powder production line, different circulation tanks are respectively communicated with a concentrated sulfuric acid pipeline, different circulation pumps and different tail gas decomposition towers of a nitric-sulfuric acid concentration procedure. Sulfuric acid is determined as the lower limit of the concentration of an absorbent, and circulated acid can be exchanged in time, so that the expected effect in absorbing the nitrogen oxide by using the concentrated sulfuric acid can be ensured, and the reduction of the concentration of the concentrated sulfuric acid, caused by circulation and absorption, is avoided. By adopting the device and the method, the nitrogen oxide absorption effect equivalent to those of a urea and hydrogen peroxide method and a pressurized absorption method can be achieved, the content of the nitrogen oxide in the waste gas can be reduced to be less than 500mg / m<3>, and moreover, the difficulty that the cost is too high in the operation process of the urea and hydrogen peroxide method and the pressurized absorption method is solved.

Description

technical field [0001] The invention belongs to the prevention and control of environmental air pollution, and in particular relates to the technical field of reducing the content of nitrogen oxides in the tail gas discharged from a propellant and explosive production line. Background technique [0002] Nitrogen oxides (NO x ) is one of the main sources of air pollution, which is extremely harmful to human beings and the natural ecological environment. Due to the nitrification process and the waste acid concentration production line in the explosives factory, it is also the main source of nitrogen oxide emissions. Therefore, it is very important to explore effective and low-cost methods to reduce the concentration of nitrogen oxides in the exhaust gas discharged from the explosives production line. . In the prior art, the nitrogen oxide content in the exhaust gas has been high for a long time due to aging equipment and backward technology in the tail gas absorption process...

AI Technical Summary

Problems solved by technology

[0008] In order to overcome the disadvantages of high raw material prices, cumbersome process operations, and expensive system operating costs in the prior art, the present invention provides a method and device for reducing the concentration of nitrogen oxides in the exhaust gas from a propellant and explosive production line

Images