Tail gas washing device and method applicable to cyclone drying process of PVC resin

Abstract

The invention relates to the field of cyclone drying of PVC resin and discloses a tail gas washing device and method applicable to a cyclone drying process of PVC resin. The device is characterized bycomprising a tail gas washing tower body, a gas inlet, an exhaust port, a cyclone plate and a spray coil, wherein the gas inlet is formed in the bottom of the tail gas washing tower, the exhaust portis formed in the top, the spray coil is located at the upper part of the gas inlet, the cyclone plate is located at the upper part of the coil, a pneumatic control valve and a flowmeter are mounted on an inlet pipeline of the spray coil, and a blow-off pipeline is arranged at the bottom of the washing tower. The problem of higher dust content of tail gas in the cyclone drying process in the existing PVC resin production industry is solved, and resin dust carried in tail gas is recycled through a series of procedures such as washing, baffling and recovery. With adoption of the technology, solid PVC resin in tail gas can be recovered, environmental pollution caused by dry tail gas is reduced, and the physical health of staff is guaranteed.

Description

technical field [0001] The invention relates to a tail gas cleaning device and a method thereof, and is particularly suitable for tail gas cleaning in the swirling drying process of PVC resin. Background technique [0002] In the process of calcium carbide suspension production of polyvinyl chloride resin, the water content of the polymerized PVC slurry is about 70%-80%. In the resin drying process, it is dehydrated by a centrifuge first to obtain a wet filter cake, and then the hot air is used for airflow. Drying, the PVC powder coming out of the drying bed enters the cyclone separator for gas-solid separation, the separated solid material enters the downstream process, and the tail gas is directly discharged into the atmosphere. The tail gas after cyclone separation contains a small amount of extremely fine PVC particles, which are difficult to separate by conventional techniques. [0003] In the existing PVC resin drying process, the gas-solid separation is usually carri...

AI Technical Summary

Problems solved by technology

In addition to the separate spray washing system in the prior art, some washing towers are also equipped with fillers to separate the solid particle dust in the tail gas. Although this separation method has a certain effect, due to the adsorption of PVC dust Strong, it is difficult to fall off when adsorbed into the filler, and as the use time increases, it will lead to an excessive load on the filler system

If some fillers are clogged, the tail gas cannot be evenly distributed in the tower and there will be a bias flow phenomenon, which will greatly reduce the separation effect of the whole tail gas. If a simple water washing process is used, the simple water washing process cannot effectively remove the impurity gas in the gas.

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