Paper mill drying exhaust gas treatment process

 The processing process of paper mill drying exhaust gas, the odor generated in the paper mill drying production process, will be completely sealed conveyor system is sent to the alkali spray tower for treatment, through the exhaust gas washing tower for chemical treatment, transformed into air pollution-free gas, and then discharged into the atmosphere. Such as from the paper mill drying process produced by the non-condensing gas and steam, its composition contains hydrogen sulfide, methanthiol, dimethyl-sulfur, dimethyl-disulfide containing sulfur compounds, but also contains turpentine, methanol, water steam, nitrogen, oxygen and other gases, corrosive, toxic. Therefore, the necessary recovery of waste gas is bound to greatly affect the air quality. Paper mills send waste gas from drying into lye spray tower for treatment, which can not only prevent serious air pollution, but also effectively recycle sulfur.

Due to the characteristics of paper mill production process in the exhaust fumes, produce the stench, adhesion, high temperature, high humidity, dust, this case need to be set up in front of the UV photolysis purification equipment water cooling tower with spray washing to dust, and the coarse filtration as the pretreatment equipment, to ensure that the dust impurities contained in the exhaust gas introduced by induced draft fan in the UV photolysis effectively intercept filtration purification equipment. Printing machine exhaust gas treatment equipment manufacturers through the initial pretreatment of the exhaust gas into the photolysis purification equipment and then sent out by the fan, and then through the exhaust air pipe high altitude emissions.

   Working principle: the main operation mode of the exhaust gas purification spray tower is to introduce the acid fog exhaust gas from the air pipe to the purification tower. After passing through the packing layer, the exhaust gas and sodium hydroxide absorption liquid are fully in contact with each other for absorption and neutralization. After being pressurized by the water pump at the bottom of the tower, the absorption liquid is sprayed on the top of the tower and finally returned to the bottom of the tower for recycling. The purified acid fog exhaust gas meets the local emission standards and is lower than the national emission standards.

The bottom of the packing tower is provided with a packing supporting plate. A packing press is installed above the packing to prevent it from being blown by the updraft. Spray tower spray from the top of the tower through the liquid distributor spray to the packing, and along the surface of the packing. The gas is sent from the bottom of the tower, and after being distributed by the gas distribution device, it continuously passes through the gap of the packing layer counter-current with the liquid. On the surface of the packing layer, the gas and liquid are in close contact for mass transfer. When the liquid flows down the packing layer, the phenomenon of wall flow sometimes occurs. The wall flow effect causes the uneven distribution of gas and liquid phases in the packing layer, thus reducing the mass transfer efficiency. Therefore, the packing layer in the spray tower is divided into two sections. A redistribution device is arranged in the middle. After redistribution, the spray layer is sprayed onto the lower packing.