Motor exhaust gas processing system to reduce hazardous emissions, separates hydrocarbon components with low boiling point into vapor fractions to be reformed and reduced and high boiling point components are returned to the fuel tank

摘要

To reduce hazardous emissions from the exhaust gas of an internal combustion motor, initially the components of the hydrocarbons with a low boiling point are separated by boiling point fractions and evaporated before the next stage where hydrogen or carbon monoxide is produced only from these components. The temperature for the boiling point fractionating is = 200[deg] C. The separated components are fed by a dosing unit (6) to a reforming reactor (7).to give the hydrogen or carbon monoxide. Air is mixed with the components at the dosing unit (6). The components of the hydrocarbons with a high boiling point are returned to the fuel tank (2). The remaining hydrogen and/or carbon monoxide in the exhaust gas flow, after the reduction stage for hazardous matter, is passed through an oxidizing stage with air to oxidize the components into water and carbon dioxide. The water is taken from the steam reduction of the hydrogen from the low boiling point components. An independent claim is included for an exhaust gas processing system with a reforming reactor (7) and a fractionating unit (5) to separate and evaporate components with a low boiling point from the components with a high boiling point. The outlet of the fractionating unit (5) leads the components with a low boiling point to the reforming reactor (7). A dosing unit (6) is between the fractionating stage (5) and the reforming reactor (7), to give a dosed feed into the reactor (7), mixed with air from an air feed supply (10) with an air heater (11). The dosing unit (6) is a jet. The fractionating unit (5) is in the fuel return line (4,4a) from the motor (1) to the fuel tank (2). The fractionating unit (5) has a pressure vessel, a heater and a rising tube to take the vaporized components with a low boiling point. The heater is electrical and/or is a heat exchanger using the motor heat. A CO shift stage is after the reformer (7). A particle filter is after the reduction catalyst. An oxidizing catalyst (15) is after the reduction reactor (14). Air is fed from the air supplies (10,16) through the oxidizing catalyst (15) and/or the particle filter.