Catalyst negative pressure suction and positive pressure conveying and screening method and system

Abstract

The invention belongs to the technical field of catalyst screening, and discloses a catalyst negative pressure suction and positive pressure conveying and screening method and system. To-be-screened catalysts of a converter are conveyed into a gas-solid separation bin by negative pressure through a material suction hole, and a material level control system of the gas-solid separation bin discharges the catalysts to a catalyst vibration screen through a discharger according to the height of the material level; after the catalysts are separated by multiple stages of screens, the small particle catalysts which are powdery and do not meet the requirements enter a collection hopper of the vibration screen and are airtightly collected by a screw machine; the particle catalysts and ceramic ballsenter respective collection hoppers and are bagged, returned and utilized; and as a certain negative pressure is formed in a screening machine, catalyst dust generated in the screening process is sucked into a bag type dust collector along with air, filtered waste gas is emptied by a Roots blower, and the residual catalyst dust is conveyed to a related unit for treatment. The system has the characteristics of no dust leakage and small catalyst takeout, screening and refilling loss, and the work environment in the catalyst screening process is improved.

Description

technical field [0001] The invention belongs to the technical field of catalyst screening, and in particular relates to a catalyst negative pressure suction positive pressure conveying screening method and system. Background technique [0002] At present, catalysts are divided into vanadium catalysts and cesium catalysts, which are SO 2 converted to SO 3 The catalyst, because the content of vanadium and cesium is between 2-5%, the country has always defined it as a solid and dangerous type; the cost of the catalyst is high! After a period of use, powdering will occur, and the powder in the catalyst needs to be removed. Due to the structural characteristics and particularity of the structure of the catalyst, the catalyst is brittle! The present invention is different from other inventions in that it focuses on solving and reducing the secondary damage of the catalyst during the process of catalyst absorption-screening-backfilling. [0003] Compared with the similar patent...

AI Technical Summary

Problems solved by technology

[0009] (1) The traditional negative pressure cyclone suction bin directly uses a cyclone separator to separate the gas and solid of the catalyst feed, and a swirling airflow is formed in the cyclone separator to allow the catalyst to rub against the inner wall of the cylinder and collect it. The catalyst is easily broken under the action of centrifugal force , resulting in increased catalyst sieving loss

[0010] (2) The disadvantage of the high-frequency vibrating screen is that the discharge valve of the catalyst buffer bin is controlled by a plug-in valve. When the valve plate is opened and closed, the catalyst is squeezed and broken, resulting in an increase in the loss of catalyst screening; and the high-frequency vibrating screen is replaced by a straight line Sieve, drum sieve, etc. Dust spillage is the biggest environmental problem

[0011] (3) During the traditional gas-solid separation, the fluctuation of the conveying volume caused by the negative pressure fluctuation caused by the unloading of the cyclone collector affects the screening operation time

[0012] (4) After the catalyst achieves gas-solid separation, the unloading method in the prior art is to use a pneumatic flapper valve. Due to the frequent movement of the flapper, the catalyst is squeezed and broken for the second time.

[0013] (5) Catalyst powder produced by traditional manual and positive pressure conveying and backfilling process cannot be removed, which not only increases the resistance of the catalyst bed, but also causes pollution to operators and the environment due to flying dust during backfilling

[0015] The significance of solving the above technical problems: reduce the damage of the catalyst screening operation process; solve the environmental protection problem of the catalyst regeneration screening operation

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