Furniture factory exhaust gas treatment

Furniture factory exhaust gas treatment
At present, there are three main characteristics of exhaust emissions from furniture spraying:

1. There are various types of paints, different curing mechanisms, and varying curing times;

2. The primer is often unsaturated resin paint, and the paint mist still has polymerization, which makes it easy to block the collection air duct;

3. The exhaust gas has a high air volume and low concentration, and often contains easily polymerized monomers such as styrene.
These are the difficulties in the treatment of VOCs in furniture spraying, and the core advantage of BME treatment technology lies in:

1. Combine and filter according to the particle size distribution of particles;

2. Deep modification of easily polymerized paint mist particles;

3. Collaborative intelligent regulation of exhaust gas treatment equipment and production lines. By analyzing the composition of the exhaust gas, it is found that the VOCs exhaust gas in the furniture manufacturing industry is usually of medium to low concentration (<1000mg/m3). Therefore, based on the characteristics of this exhaust gas and existing relevant enterprise management experience, it is more suitable to use a combination process to treat organic exhaust gas in the furniture manufacturing industry. Taking the basic combination processing technology as an example:
1、 Adsorption concentration+catalytic combustion process

1. Technical principle: Adsorption concentration+catalytic combustion process is an integrated technology that combines adsorption concentration and catalytic combustion. It converts high air volume and low concentration organic waste gas into low air volume and high concentration organic waste gas through adsorption desorption process, and then purifies it through catalytic combustion.

2. The organic waste gas in the process flows through the adsorption layer under the action of the fan, and the clean gas is discharged; After a period of time, when the adsorption layer reaches saturation, the adsorption stops, and the organic matter has already been concentrated in the adsorption layer. The catalytic purification device is equipped with a heating chamber. When the heating device is activated and enters the internal circulation, when the hot gas source reaches the desorption temperature of organic matter, the organic matter is desorbed from the adsorption layer and enters the catalytic chamber for catalytic combustion, decomposing into water and carbon dioxide while releasing heat. By utilizing the released heat to enter the adsorption bed for desorption, while the heating device partially stops working, the organic waste gas maintains spontaneous combustion in the catalytic combustion chamber, circulating until the pollutants are completely decomposed from the adsorption layer to the catalytic combustion chamber, and finally the adsorption capacity of the adsorption layer is restored.

3. The main types of organic waste gases treated are benzene, toluene, xylene, ethyl acetate, 2-butanone, butyl acetate, etc. Generally applicable to high air volume organic waste gas with organic concentration below 1000mg/m3. The purification efficiency of the adsorber is greater than 90%, and the purification efficiency of the catalytic burner is greater than 95%.

2、 Zeolite rotary adsorption concentration+regenerative thermal oxidation (RTO) process

1. Technical principle: The zeolite rotary adsorption concentration+regenerative thermal oxidation process is an integrated technology that combines adsorption concentration and regenerative thermal oxidation. It converts high air volume and low concentration organic waste gas into low air volume and high concentration organic waste gas through adsorption desorption process, and then purifies it through regenerative oxidation.
2. The high air volume organic mixed waste gas to be processed in the process flow is discharged by a fan, and then enters the pre-treatment filtration device through the power of a rotary exhaust fan to remove dust and impurities from the waste gas. After filtration, the "relatively pure organic waste gas" enters the adsorption device for adsorption and purification treatment. The organic substances are trapped inside by the force of the adsorbent, and the clean gas is discharged. After a period of adsorption, the adsorbent reaches saturation and enters the cooling and high-temperature desorption zone. The high concentration exhaust gas desorbed by the adsorbent directly enters the RTO regenerative incinerator for incineration purification treatment. The high-temperature gas in the oxidation chamber after exhaust gas incineration exchanges heat with the desorbed exhaust gas through a heat exchanger. After heat exchange, the desorbed exhaust gas enters the desorption zone for desorption. The organic matter of the adsorbent evaporates from the adsorbent after being heated by hot air, resulting in high concentration, low air volume, and high temperature of the desorbed exhaust gas. Organic waste gas directly enters the RTO incinerator for oxidation, releasing a large amount of energy, and utilizing the heat released by the combustion of organic matter to maintain spontaneous combustion.

3. The main types of organic waste gases treated are benzene, toluene, ethyl acetate, butyl acetate, cyclohexanone, etc. Generally applicable to exhaust gases with organic concentration below 1500mg/m3. The removal rate of VOCs in exhaust gas can reach over 90%.