Method and device for utilizing temperature swing adsorption method to remove impurities in coal gas

Abstract

The invention discloses a method and device for utilizing a temperature swing adsorption method to remove the impurities in the coal gas. The method comprises the steps that oil water is removed fromthe raw material gas through a coke filter, adsorption is conducted through a two-stage adsorption tower and a three-stage adsorption tower sequentially, the coal gas subjected to three-stage treatment is precisely filtered, the adsorption agent powder in the coal gas is removed, and the coal gas is conveyed to the downstream user end through a conveying pipeline; the length of the adsorption agent bed is prolonged accordingly by conducting stage purification on the raw material gas, the filter is additionally arranged before the coal gas passes through an adsorption device, and the filter canachieve the great separation and filtration effect on the oil impurities in the coke coal gas, and achieves the great protection effect on the adsorption agent; the adsorption agent is filled with adrying agent, so that water is unsaturated, and other impurities are hard to generate; the regeneration temperature is controlled to be within the reasonable range, and the pulverization speed of theadsorption powder is decreased; and different types of active carbon is adopted to serve as the adsorption agent, so that the adsorption agent has the better efficient selectivity compared with the simplex type of active carbon, the adsorption effect is better, and the life of the adsorption agent is greatly prolonged.

Description

【Technical field】 [0001] The invention belongs to the technical field of removing impurities by temperature-swing adsorption of coke oven gas, and in particular relates to a method and a device for removing impurities in gas by using a temperature-swing adsorption method. 【Background technique】 [0002] The technology of extracting coke oven gas from coal and removing impurities by temperature swing adsorption (TSA) after pressurization is to use the characteristic that the equilibrium adsorption capacity of the adsorbent decreases with the increase of temperature, and adopts the operation method of normal temperature adsorption and temperature rise desorption, Adsorption is carried out at a lower temperature to remove impurities in the gas, and then the adsorbed impurity components are resolved by raising the temperature. The devices involved in the method mainly include an adsorption tower, a heater, a cooler and a corresponding number of valves. This method has the follo...

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Problems solved by technology

This method has the following problems in production: 1. The height-to-diameter ratio design of the adsorption tower is unreasonable, and there are many parallel connections, resulting in gas deviation and low adsorption efficiency; 2. The adsorption effect of single activated carbon is poor, and the oil-water separation before adsorption is not complete. The existence of other impurities (water, elemental sulfur) in coke oven gas affects the adsorption efficiency; 3. The temperature control during the regeneration of the adsorbent (that is, desorption) is unreasonable, which leads to partial failure of the adsorbent and greatly reduces the adsorption efficiency; 4. There are many adsorption towers A parallel type, resulting in gas partial retention, uneven adsorption effect

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