Multistage spraying fluidization tail gas washing tower

Abstract

The invention discloses a multistage spraying fluidization tail gas washing tower. A tail gas inlet is formed in the bottom of the washing tower, and a tail gas outlet is formed in the top end of the washing tower. The washing tower comprises at least two stages of independent circulation spraying sections, wherein at least one stage of independent circulation spraying section is filled with light sphere packing, so that the fluidization independent circulation spraying sections are formed. The independent circulation spraying sections conduct spraying through an independent circulation spraying system. The multistage spraying fluidization tail gas washing tower can treat multi-component tail gas and has the advantages of being high in washing efficiency, not prone to blockage, convenient to wash, capable of reducing cost and wide in application prospect.

Description

technical field [0001] The invention relates to chemical waste gas treatment equipment, in particular to a multi-stage spray fluidized tail gas washing tower. Background technique [0002] In the field of petrochemical industry, the recovery of multi-component reaction products and the treatment of multi-component tail gas are research topics that cannot be bypassed, and are also an urgent need for environmental protection. Most petrochemical plants use the traditional process of incineration or tail gas scrubbing to treat the tail gas, and in most cases, the tail gas after incineration also needs to be washed and purified before being discharged, so the tail gas scrubber is widely used. Especially for phthalic anhydride, maleic anhydride, benzoic acid, SO 2 、H 2 S, NH 3 The tail gas of other substances is generally treated by washing towers, among which packed towers are the main ones, and some plate towers are also used, and even empty towers are sprayed. [0003] Chin...

AI Technical Summary

Problems solved by technology

However, due to the complex and diverse components of the tail gas, plugging of packed towers or tray towers often occurs, which not only increases the cost of packing and trays, but also reduces the gas-liquid contact area and mass transfer efficiency after blockage, consumes a lot of washing liquid, and troublesome maintenance and cleaning , resulting in waste of resources, increased costs, and more likely to cause environmental pollution

[0004] At present, the production process of phthalic anhydride uses o-xylene, industrial naphthalene or the mixed oxidation of the two to prepare phthalic anhydride. Among them, impurities such as thiane in industrial naphthalene will produce sulfur dioxide that pollutes the environment during the oxidation process. As the emission standards become more stringent , the treatment of sulfur dioxide has become a new challenge in the treatment process of phthalic anhydride tail gas

Chinese patent 201310141847.7 discloses an industrial tail gas desulfurization device, which uses phosphate rock slurry to absorb sulfur dioxide, but the slurry also has the problems of easy clogging and troublesome cleaning. During the production process, it must be frequently stopped for cleaning, resulting in certain economic losses.

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