Introduction to the internal structure of the wet scrubber, spray device and defogging device
The organic waste gas is introduced into the scrubbing tower through the air pipe, and passes through the packing layer. The waste gas and the sodium hydroxide absorption liquid undergo gas-liquid two-phase full contact, absorption and neutralization reaction. Into the atmosphere. The absorption liquid is sprayed down at the top of the tower after being pressurized by a water pump at the bottom of the tower, and finally returned to the bottom of the tower for recycling. The purified organic waste gas meets the emission requirements of the local emission standards of Guangdong Province, which is lower than the national emission standards.
The packing layer in the wet scrubber serves as a mass transfer device for the contact components between the gas and liquid phases. The bottom of the packing tower is equipped with packing support plates, and the packing is placed on the support plates in a random pile. A packing pressure plate is installed above the packing to prevent it from being blown by the rising airflow. The spray liquid of the wet scrubber is distributed from the top of the tower through the liquid
The device is sprayed onto the packing and flows down the surface of the packing. The gas is fed in from the bottom of the tower, and after being distributed by the gas distribution device, it continuously passes through the gaps in the packing layer in countercurrent with the liquid. On the surface of the packing, the gas and liquid two phases are in close contact for mass transfer. When the liquid flows down the packing layer, sometimes
There will be a wall flow phenomenon. The wall flow effect causes uneven distribution of the gas and liquid phases in the packing layer, thereby reducing the mass transfer efficiency. Therefore, the packing layer in the wet scrubber is divided into two sections, with a redistribution device in the middle, which is sprayed onto the lower packing after redistribution.
The filler is mainly used as an air distribution device and is arranged in the lower part of the spray area of the absorption tower. After the exhaust gas passes through the tray, it is evenly distributed across the entire absorption tower section. This kind of air distribution device is necessary to improve the absorption efficiency. In addition to uniform smoke distribution in the main spray area, the oxidation tower tray also allows the smoke to fully contact the liquid film area of the absorption liquid or the washing liquid on the tray. The tray structure is a perforated plate with a partitioned cofferdam. The tray is divided into plates that are convenient to enter and exit from the manhole of the absorption tower, and they are placed horizontally on the structure supported by the tray.
The spray system inside the absorption tower is a mesh system composed of a distribution header and nozzles. Each absorption tower recirculation pump corresponds to a spray layer, and a spiral nozzle is installed on the spray layer to atomize the spray liquid. The spray liquid is delivered to the nozzle by the absorption tower recirculation pump, and sprayed into the exhaust gas. The spray system can make the slurry evenly distributed in the absorption tower, and the flow through each spray layer is equal.
Used to separate the droplets carried by the flue gas. The mist eliminator of the absorption tower is arranged on the upper part of the last spray assembly on the top of the absorption tower. After the flue gas passes through the circulating slurry spray layer and then continuously flows through the mist eliminator, the droplets remain on the baffle due to inertia. Since the retained liquid droplets also contain solids, there is a risk of scaling on the baffle, and regular cleaning is required to remove the contained slurry droplets.
Mainly applicable to: VOC in the semiconductor industry, laboratory exhaust, metallurgy, chemical, pharmaceutical, painting, petroleum, asphalt, painting, printing and furniture production and other industries organic waste gas treatment.
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