SU1745312A1 - Method of cleaning air from carbon dioxide and water vapors - Google Patents

Abstract

The invention relates to the technology of air purification from carbon dioxide and water vapor by adsorption on a solid absorber with simultaneous exposure to corona or barrier discharges used in the chemical and gas sectors of the industry. Gas cleaning is carried out in the first layer by contacting with a zeolite to an impurity content of 200-400 ppm, in the second layer silica gel is used as an adsorbent, which is subjected to continuous exposure to a barrier or corona discharge. The method allows reducing the residual content of water vapor and carbon dioxide from 250 to 1-4 ppm, 3 sludge.

Description

The invention relates to methods for the purification of gases from impurities by adsorption on solid absorbers and can be used for deep drying and purification of air from carbon dioxide.

The disadvantage of this method is the necessity of carrying out the process under high pressure. At normal pressure, a low degree of purification is achieved.

The aim of the invention is to reduce the residual content of carbon dioxide impurities and water vapor.

This goal is provided by the method of purifying air from carbon dioxide and water vapor, including contacting air with two layers of adsorbent, the first of which uses zeolite, and regenerating the adsorbent by heating, according to the invention, cleaning the gas in the first layer to an impurity content of 200-400 ppm , in the second layer, silica is used as an adsorbent, which is subjected to continuous

exposure to barrier or corona discharge.

The application of the proposed method is based on the fact that when the content of purified impurities in the air is 200-400 ppm, silica gel, when exposed to a barrier or corona discharge, intensively absorbs impurities, providing deep air purification from carbon dioxide and water vapor. In the first layer, a zeolite is used, which makes it possible to achieve an impurity content per layer of 200-400 ppm.

The proposed method allows to ensure the degree of air purification from water vapor and carbon dioxide up to 1-4 ppm, and to significantly simplify the process.

Fig. 1 is a setup diagram for implementing the method; 2 shows an adsorber using a corona discharge; in FIG. 3 - the same, using a barrier discharge.

The installation consists of two lines with two series-connected adsorbers each, containing brand zeolite

(L

WITH

eat s

Yu

CaA and silica gel KSM-5 in the second adsorber can be used to ignite the barrier or corona discharge by applying high voltage. Pre-both adsorbent is subjected to regeneration by heating with nitrogen purging: zeolite to 400 ° C, silica gel to 200 ° C.

The adsorber is a cylindrical metal body 1, bounded at the ends by flanges 2, in the center of which are dielectric bushings 3, insulating the corona wire 4 from the grounded body. The cleaned air enters the housing through the nozzle 5, where it contacts the adsorbent 6 and at the same time is exposed to a corona discharge. Purified air is discharged from the adsorber through fitting 7.

During the process, a voltage of 10-40 kV is supplied to the corona wire, which is maintained throughout the cleaning process.

The cylindrical body 1 is bounded at the ends by flanges 2. Along the axis of the cylinder is a dielectric sleeve 3, isolating the high-voltage wire 4 from the body and space with adsorbent 5, the cleaned air enters the adsorber through fitting 6, where it contacts the adsorbent and is simultaneously exposed to a barrier discharge Purified air is discharged from the adsorber through fitting 7.

EXAMPLE 1 Air purification is carried out using two successive layers, zeolite and silica gel. Air flow rate is 0.2 l / min.cm2, pressure is atmospheric. The CO content in the source gas is 2-5%, moisture 0.5-1.5%. The total content of impurities at the output of the first stage of 300 ppm. In the second layer

the adsorbent is exposed to a barrier discharge. The content of impurities at the output of the second layer is 1-4 ppm.

EXAMPLE 2 Cleaning Is Performed

air using corona discharge in the second layer. The rate of air flow and the total content of impurities at the output of the first layer is analogous to example 1. The content of impurities at the output of the second

a layer of 1-4 ppm.

PRI me R 3. The cleaning is carried out using two successive layers, a zeolite and a silica gel. Air flow rate 0.2 l / min.cm2. Content in

source gas CO2 2 -105 ppm; Н20 s -104 ppm. The content of impurities at the output of the first stage: C02 250 ppm, NaO 50 ppm, i.e. total content of 300 ppm.

In the second layer, silica gel is used without exposure to the discharge. The impurity content after the second layer is 250 ppm.

As seen from the examples, the proposed method allows to reduce the residual content of water vapor and carbon dioxide.

from 250 ppm in a known way to 1-4 ppm.

Claims (1)

Claims The method of purifying air from carbon dioxide and water vapor, including the coagulation of air with two layers of adsorbent, the first of which uses zeolite, and the regeneration of the adsorbent by heating, characterized in that, in order to reduce the residual content impurities, gas cleaning in the first layer is made to contain impurities (200-400), in the second layer silica gel is used as an adsorbent with a continuous exposure to a barrier or corona discharge. | Clean $ (cleaned) DM tf Gas on. line  regeneration - 4 Cvpou 2Q3 (fody) Figure 1 g yn W four Gas on. F line degeneration