METHOD AND APPARATUS FOR CLEANING GAS MIXTURES FROM HAZARDOUS CONTAMINANTS Russian patent published in 1995 - IPC

FIELD: gas cleaning process. SUBSTANCE: method involves conducting selective dissociation of contaminants in the process of radiating gas flow to be cleaned by ultraviolet radiation in countercurrent flow, with ultraviolet radiation intensity and flow rate of gas to be cleaned being selected on the base of , ultraviolet radiation pulse time being selected on the base of , contaminant molecule density in the flow of gas to be cleaned being selected on the base of v_d ≪ v_g, ultraviolet radiation pulse frequency being selected on the base of f>D·σ²·n²,, where v_g is flow rate of gas to be cleaned, G is photochemical dissociation output product, I_o is ultraviolet radiation flow intensity, n is density of contaminant molecules in gas, σ is contaminant molecule photodissociation section, v_d is rate of diffusion of contaminant molecules in gas. Apparatus has reaction volume with inlet and outlet branch pipes, ultraviolet radiation sources, dissociation product catcher. Ultraviolet radiation sources are disposed circumferentially of apparatus cover. Apparatus has two funnels having different sizes and inserted one into another in wide end-to-wide end relation. Rectilinear part of larger funnel is terminated by inlet branch pipe. Flaring part of smaller funnel is provided with openings for emitting ultraviolet radiation. Openings are oriented onto larger funnel throat. Purified gas branch pipe is disposed in rectilinear part of smaller funnel behind dissociation product catcher. Dimensions of apparatus are selected in accordance with ratio of , where d_o, d₁, d₂ are diameters of rectilinear, flared part of larger and smaller funnels, respectively. Heat-exchanger for heating gas is positioned behind inlet in rectilinear part of larger funnel. Improvement allows radiation utilization coefficient to reach 100% , specific capacity to reach 10⁴+10⁵ as compared to that of prototype. EFFECT: increased efficiency and enhanced reliability in operation. 4 cl, 1 dwg