Home / Company News / The hazards and treatment methods of acid and alkali waste gas

The hazards and treatment methods of acid and alkali waste gas

Views: 9     Author: Xicheng Ep Ltd     Publish Time: 2021-09-27      Origin: Xicheng Ep Ltd

Exhaust gas introduction: The company will volatilize a certain amount of acid and alkali waste gas during the production process. The main pollutants of acid and alkali waste gas are nitric acid mist, hydrogen chloride, sulfuric acid mist, cyanide, chromic acid mist, and alkali mist.

Acid-base waste gas is generally flammable, explosive, toxic and harmful, insoluble in water, soluble in organic solvents, and difficult to handle. Domestic acid-base waste gas treatment generally adopts the acid-base neutralization method.

Main components: sulfur oxides, nitrogen oxides, carbon oxides, halogens and their compounds, etc. Such as hydrochloric acid (HCl), hydrogen fluoride gas (HF), ammonia (NH3), sulfuric acid mist (H2SO4), chromic acid mist (CrO3) ), hydrocyanic acid gas (HCN), alkali vapor (NaOH), hydrogen sulfide gas (H2S), formalin (HCHO) and other water-soluble gases.

Main sources: PCBs, semiconductors, electronics and optoelectronics, metallurgical plants, plastics, pickling and electroplating plants, chemicals, electrolysis, battery electroplating, pharmaceuticals, deodorization and other water-soluble air pollutants that produce waste gas production and processing enterprises.

Main hazards: The main pollutants that cause atmospheric acidification are sulfur dioxide and nitrogen oxides emitted during the combustion of fossil fuels. The emission of acid mist cannot be ignored, because compared with the combustion gas phase, the acid mist is more corrosive and more toxic Big. For example, the toxicity of sulfuric acid mist is about 10 times that of sulfur dioxide. The discharge of acid mist will cause acid mist and acid gas to diffuse in the air of the workplace, and the discharge into the atmosphere will cause acid to deposit in the atmosphere. It not only endangers the health of workers and residents around the plant, corrodes plant equipment and instruments, causing loss of production and life, but also adversely affects the survival of crops and other animals and plants, and damages buildings. Cultural relics, etc. Damage etc.

An introduction

Working principle of acid-base waste gas treatment equipment:

Wet scrubber flow chart

The acid mist exhaust gas from the pickling tank is collected by the wind hood under the action of the fan's gravity and then enters the acid-base exhaust gas treatment equipment (Wet Scrubber) through the pipeline. The spray is evenly distributed in the packing layer and flows down the surface of the backing layer into the circulating water tank. Since the rising exhaust gas and the falling absorption liquid are in constant contact in the filler, the acid-base gas is captured by the water, and the acid mist path is centrifuged or filtered and flows into the circulation tank through the tower wall due to gravity. The purified gas can be discharged completely. The wastewater is recycled in the circulating tank after the dosing treatment, and the sediment is cleaned regularly.

 Copyrights 2021 China Xicheng EP Ltd  All rights reserved. 
We use cookies to enable all functionalities for best performance during your visit and to improve our services by giving us some insight into how the website is being used. Continued use of our website without having changed your browser settings confirms your acceptance of these cookies. For details please see our privacy policy.