Device and method for increasing washing efficiency of catalyst in reactant gas

Abstract

The invention relates to a device and a method for increasing the washing efficiency of a catalyst in reactant gas, which are mainly used for solving the problems that the washing efficiency of the catalyst in the reactant gas at the outlet of a fluidized bed reactor for preparing low-carbon olefin with methyl alcohol is low, and catalyst fine powder flows along with the reactant into a follow-up system to block equipment such as a follow-up tower and a heat exchanger and pipelines and shorten the operating cycle of a device. The problems are well solved through the adoption of the technical scheme that the device comprises a housing, a reactant gas inlet, a reactant gas outlet, a reactant gas washing liquid inlet and a catalyst washing liquid outlet, wherein a washing liquid spraying layer, which is formed in such a way that spray nozzles are arranged in a geometrical shape, is arranged at the reactant gas washing liquid inlet and located in the device and above the reactant gas inlet, and reactant gas washing liquid and reactant gas are in countercurrent contact for washing. The device and the method can be used in an industrial device for preparing low-carbon olefin with methyl alcohol.

Description

technical field [0001] The invention relates to a device and method for improving catalyst washing efficiency in reaction gas. Background technique [0002] In the methanol-to-light olefins unit, the reaction gas at the outlet of the fluidized bed reactor contains catalyst fine powder, which must be removed in the quench tower, otherwise it will cause blockage of the tower, heat exchanger, pipeline, etc. when entering the subsequent system. As a result, the resistance of the system increases, the separation efficiency of the tower decreases, the heat exchange effect of the heat exchanger decreases, the consumption of the device increases, and the operating cycle is shortened, which affects the normal operation of the device. In severe cases, it must be stopped for cleaning. [0003] In the methanol-to-light olefins plant, the quench tower is a key equipment. The reaction gas at the outlet of the fluidized bed reactor is pre-cooled from 450~500°C to about 240~280°C, and then ...

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Problems solved by technology

[0006] One of the technical problems to be solved by the present invention is that in the methanol-to-light olefins device existing in the prior art, there are unreasonable quench tower design, uneven gas-liquid distribution, insufficient gas-liquid contact, and catalyst fine powder washing. The removal efficiency is not high, and the catalyst fine powder enters the follow-up tower, heat exchanger and pipeline system, resulting in blockage of follow-up equipment and pipelines, resulting in increased system resistance, decreased operating load, increased device consumption, and shortened operating cycle. A new method is provided. Device for Improving Catalyst Scrubbing Efficiency in Reaction Gas

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