Backflush system and method for adsorption tower

Abstract

The invention belongs to the technical field of aromatic hydrocarbon adsorption devices, and particularly relates to a backflush system and method for an adsorption tower. An Nth layer upper grating and an Nth layer V-hole grating are arranged in sequence below a bed layer N to be flushed; an Nth layer desorption agent inlet pipeline is connected to a desorption tower wall between the Nth layer upper grating and the Nth layer V-hole grating; an Nth layer extract pipeline is connected to a desorption tower wall on the upper part of the Nth layer upper grating; an (N-1)th layer feeding pipelineis arranged on the desorption tower wall on the upper part of an (N-1)th layer upper grating of a previous layer of the bed layer N to be flushed; an (N+1)th layer desorption agent inlet pipeline is arranged on a desorption tower wall on the upper part of an (N+1)th layer upper grating of a next layer of the bed layer N to be flushed. By adopting the backflush system and method, an adsorbent doesnot need to be scrapped, the leaking adsorbent can be flushed out by performing a backflush operation in a halting state, the pressure difference of the bed layer is lowered, and continuous productionis facilitated.

Description

technical field [0001] The invention belongs to the technical field of aromatic hydrocarbon adsorption devices, and in particular relates to an adsorption tower backwashing system and method. Background technique [0002] The core equipment of the adsorption device of the aromatics plant - the adsorption tower. The adsorption tower adopts Axens process technology, and the adsorption tower is equipped with adsorbents, with a total of 24 beds. Each bed layer of the adsorption tower is equipped with adsorbent, and there are two layers of grids between each bed layer. When a layer of adsorbent leaks in the adsorption tower, the leaked adsorbent falls into the grid, causing the pressure difference of a single bed to rise. , when the pressure difference of the single bed layer rises to the design pressure difference of 70KPa (the upper limit of the Axens process requirements), the device will not be able to operate and needs to be shut down for maintenance, because the water co...

AI Technical Summary

Problems solved by technology

Each bed layer of the adsorption tower is equipped with adsorbent, and there are two layers of grids between each bed layer. When a layer of adsorbent leaks in the adsorption tower, the leaked adsorbent falls into the grid, causing the pressure difference of a single bed to rise. , when the pressure difference of the single bed layer rises to the design pressure difference of 70KPa (the upper limit of the Axens process requirements), the device will not be able to operate and needs to be shut down for maintenance, because the water content of the adsorbent is required to be less than 8%. There is oil in the adsorption tower, and the oil needs to be removed for cooking. The adsorbent must be scrapped, and the adsorbent is expensive, costing hundreds of millions of yuan

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