Paint Spraying In Coating PlantsExhaust Gas Treatment Solutions

(physical works cases)

Industry Introduction

Painting is an important part of the modern product manufacturing process. For example, the quality of anti-rust and anti-corrosion coating is one of the important aspects of the overall quality of the product. The quality of product appearance not only reflects the product protection and decorative properties, but also constitutes an important factor in the value of the product. Painting is a systematic project, which includes the treatment of the surface of the coated object before painting, coating process and drying of the three basic processes as well as the design of a reasonable coating system, the selection of suitable coatings, to determine the conditions of a good operating environment, quality, process management and techno-economic and other important links.

Pollution hazards

The coating process will produce certain hazards, usually in the old paint sanding, pickling, as well as spraying and drying process produces volatile organic compounds. Not collected by the treatment of paint exhaust, the human respiratory tract and lungs are very harmful. Because there are 60% solvents (containing toxic substances such as benzene, toluene, xylene, etc.). Long-term paint spraying will appear skin mucous membrane irritation, the nervous system and liver, kidney, haematopoietic system damage.

Overview of paint spraying waste gas treatment programme for coating plants

For the paint spraying factory VOCs treatment technology, now in line with environmental emission requirements, and play a role in reducing costs and efficiency of the treatment technology, is the use of combustion method of treatment technology is more economical and energy-saving. It is recommended to use: wet jet washing (multi-pipe) + dry filter + wind reduction and thickening + catalytic combustion combination of governance, governance can meet the emission requirements of standards!

Paint factory paint exhaust treatment process flow

Wet jet washing (multi-tube) + dry filtration + zeolite rotor adsorption concentration + catalytic combustion process (integrated system) process treatment. Organic waste gas is collected through the pipeline, and enters the pretreatment wet jet tower to remove paint dew, acidity and particles of purification. After purification, the gas is introduced into the dry filter to remove particles and zeolite adsorption of hazardous substances, and the organic waste gas is then sent to the zeolite adsorption bed device, and the VOCs in the waste gas is absorbed by the zeolite and then discharged to the atmosphere in compliance with the standards. When the zeolite adsorption bed is saturated by electric heating at high temperature (100-180 ℃ C) desorption of VOCs substances, desorption of high concentrations of organic waste gas directly into the catalytic combustion co, through the accelerated oxidation of high concentrations of waste gas by precious metals, in ( 250-380 ℃) high temperature purification and oxidation of harmless carbon dioxide (CO2) and water vapour (H20) and discharge to the atmosphere to meet the standards.

Other treatment process technology

Low concentration and small air volume paint spraying waste gas can be used: spray tower, uv photolysis purifier, activated carbon adsorption and other single or multiple combinations of processes for treatment;

High concentration of small air volume painting plant paint exhaust can be used: pretreatment + zeolite molecular sieve + catalytic combustion, pretreatment + zeolite molecular sieve + RTO regenerative incinerator, a single catalytic combustion device or a single RTO regenerative incinerator and so on;

High concentration and large air volume paint spraying waste gas can be used: pretreatment + zeolite rotor concentration + catalytic combustion or pretreatment + zeolite rotor concentration + RTO thermal storage incinerator and so on.