Phosphoric acid tail gas electric demister

Abstract

The invention discloses a phosphoric acid tail gas electric demister which adopts a constant current high-voltage DC power 30-70 kV to produce a high-voltage electrostatic field. An anode static electricity sediment tube adopts a honeycombed, triangle or square structure so as to ensure that the arrangement structure of equipment is compact, the area of the electrostatic field is enlarged, and the phosphoric acid tail gas handling capacity is improved; a high-voltage electrostatic field is provided with a cooling system; phosphoric acid tail gas enters the anode static electricity sediment tube from a distribution chamber to be further cooled to reduce the flow velocity of the phosphoric acid tail gas, enhance ionization effect and improve phosphoric acid deposition rate, thereby purifying the phosphoric acid tail gas. After the phosphoric acid tail gas is electrically demisted and purified, the phosphoric acid tail gas which contains a small quantity of steam is discharged, and no smoke exists visually. The content of phosphoric acid in the phosphoric acid tail gas is lowered to be less than or equal to 1 PPM from the content which is more than or equal to 50 PPM after the phosphoric acid tail gas is electrically demisted, and the phosphoric acid yield is improved by above 0.5%.The invention solves the problem of environment pollution caused by phosphoric acid production, effectively protects factories and peripheral environment and improves economic and social benefits.

Description

Technical field: [0001] The invention belongs to the field of phosphorus chemical technology and environmental protection technology, and relates to an electric demisting device for phosphoric acid tail gas. technical background: [0002] The tail gas in phosphoric acid production contains impurity gases such as phosphorus pentoxide, phosphorus trioxide and elemental phosphorus. The discharge of such tail gas will cause serious air pollution. The existing tail gas treatment method is generally water washing method, Li Yun, Zhou Junhong in "The analysis and countermeasures of excessive phosphorus pentoxide emission in the tail gas of thermal phosphoric acid production", sulfur phosphorus design and powder engineering, 2006 No. 5, mentioned in When the content of phosphorus pentoxide in the tail gas discharged from the production of thermal phosphoric acid is seriously exceeded, two countermeasures are put forward: the first is to transform the production process equipment and...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems existing in the prior art for treating phosphoric acid tail gas, aiming to provide an economical and practical phosphoric acid tail gas electric demisting device with stable purification quality and no secondary pollution, so as to solve the environmental pollution of phosphoric acid production and improving economic and social benefits

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