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

A technology of reaction gas and washing efficiency, applied in the direction of chemical instruments and methods, separation methods, and the use of liquid separation agents, etc., can solve the problems of shortened operating cycle, insufficient gas-liquid contact, and increased system resistance, so as to reduce the cost of parking and cleaning frequency, improve the cooling effect, and the effect of uniform gas-liquid contact

Inactive Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

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Embodiment 1

[0036] A device for improving the catalyst washing efficiency in the reaction gas. In the washing tower at the outlet of the fluidized bed reactor, two layers of reaction gas washing liquid spray layers are arranged in a square arrangement of hollow cone nozzles. The arrangement density of the nozzles is 2 nozzles / m 2 , above the spray layer, set 2 bubble cap plates of theoretical plates as demisters, set 6 theoretical plates of grid packing under the spray layer of reaction gas washing liquid and above the inlet of reaction gas, and set dendritic porous at the inlet of reaction gas Type sparger, after being sprayed and washed by the nozzle of the washing tower, the removal rate of the catalyst fine powder entrained in the reaction gas reaches 99.8%, the washing tower and subsequent systems are not blocked, the separation efficiency of the separation tower, the heat transfer effect of the heat exchanger, the system resistance, The load of the device remains unchanged, and the ...

Embodiment 2

[0039] A device for improving the catalyst washing efficiency in the reaction gas. In the washing tower at the outlet of the fluidized bed reactor, 8 layers of reaction gas washing liquid spray layers composed of solid cone nozzles arranged in an equilateral triangle are arranged. The arrangement density of the nozzles is 1 nozzle / m 2 , a sieve plate with a theoretical plate is set above the spray layer as a demister, a Raschig ring packing with 10 theoretical plates is set under the spray layer of the reaction gas washing liquid and above the inlet of the reaction gas, and double rows of blades are set at the inlet of the reaction gas Type distributor, the removal rate of catalyst fine powder entrained in the reaction gas after spraying and washing by the nozzle of the washing tower reaches 99.6%, the washing tower and subsequent systems are not blocked, the separation efficiency of the separation tower, the heat transfer effect of the heat exchanger, the system resistance, an...

Embodiment 3

[0042] A device for improving the catalyst washing efficiency in the reaction gas. In the washing tower at the outlet of the fluidized bed reactor, a layer of reaction gas washing liquid spray layer composed of spiral nozzles arranged in a rectangle is arranged. The arrangement density of the nozzles is 4 nozzles / m 2 , above the spray layer, set one piece of theoretical plate packing as a demister, set two theoretical plates of regular wire mesh corrugated packing under the reaction gas washing liquid spray layer, and above the reaction gas inlet, and set the reaction gas inlet with a semicircular tube type Distributor, after being sprayed and washed by the nozzle of the washing tower, the removal rate of the catalyst fine powder entrained in the reaction gas reaches 99.7%, the washing tower and subsequent systems are not blocked, the separation efficiency of the separation tower, the heat transfer effect of the heat exchanger, the system resistance, and the device load Keepin...

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D47/06
CPCB01D47/06
Inventor 顾军民韩诚康
Owner CHINA PETROLEUM & CHEM CORP
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