METHOD OF CLEANING DIESEL ENGINE EXHAUST GASES FROM SOLID PARTICLES Russian patent published in 1997 - IPC

FIELD: environment protection; cleaning exhaust gases from hard particles formed during combustion of hydrocarbon fuel in diesel engines of different applications. SUBSTANCE: flow of exhaust gases is passed first through afterburner and then through filtering element. Pressure of exhaust gases before and after filtering element and temperature of exhaust gases before afterburner (Tx1

) and after afterburner (Tx2) are measured and if pressure differential across filtering element (ΔP^x) exceeds maximum tolerable value (ΔPxmax) exhaust gas flow is heated by delivering additional fuel to burn exhaust gases flow is heated by delivering additional fuel to burn exhaust gases in oxygen. Used as ΔPxmax is preset function of measured values of relative speed of engine rotor and temperature Tx1 before afterburner. If temperature of filtering element differs from preset value (T_фmax), heating of flow is decreased or increased as necessary, by regulating consumption of additional fuel. Used as T_ф.max is temperature at which intensive burning of soot on surface of filtering element is exhaust gas oxygen is provided. Then volume concentration of oxygen in exhaust gas flow before afterburner (O₂) is measured and flow is heated in case when ΔP^x exceeds ΔPxmax and oxygen content (O₂) exceeds minimum tolerable value ((O₂)_min). Flow is heated until ΔP^x is smaller than preset minimum tolerable value (ΔPxmin). Then delivery of additional fuel is stopped. It should be mentioned that ΔP_min is preset function of and Tx2, and (O₂)_min is preset function of only. EFFECT: improved functioning of automatic filter regeneration system, increased economy at regulation and increased service of filter. 6 cl, 2 dwg