Method for rejuvenating a smoke filter which is adapted to remove solid particles from an internal combustion engine exhaust gas stream. The filter includes a bed which forms a multi-passage path along which an exhaust stream flows, and in which carbon particles are retained. A heating element incorporated into the filter bed periodically heats the flowing exhaust gas stream as well as the bed. Rejuvenation of the bed by burning off carbon is regulated in response to variations in the gas pressure, and in the bed temperature.
A method and apparatus is disclosed for periodically oxidizing particulate matter trapped in and on an exhaust gas purifying device used in conjunction with a diesel engine. Fuel normally delivered to selected combustion chambers is diverted to a fuel burning device associated with the purifying device. The diversion deactivates the combustion process in the selected chambers. The diverted fuel is then burned by the burning device to increase the exhaust gas temperature flowing through the purifying device and effect oxidation of collected particles.
Feed and/or exhaust air can be readily and effectively sterilized by passing said air through a high-temperature filter equipped with built-in heat-retaining material, which process is available in air supply and/or exhaust systems of, e.g., culture equipment for microorganisms and clean rooms in hospitals.
A filtering method of flue gas of a boiler employing a filter apparatus integrated with ceramic filters and provided with a control mechanism for regenerating the ceramic filter by reverse cleaning and a detecting mechanism for detecting directly or indirectly unburnt component. Valves of a compressed gas are operated by a signal from the control mechanism when flying-over of the unburnt component is detected to thereby start at once frequent reverse cleaning wherein the compressed gas is blown into the cleaned gas spaces and thereafter the frequent reverse cleaning having a period shorter than four minutes continues until the flying-over of the unburnt component decreases to a small quantity.
The present invention relates to an exhaust emission control apparatus for an internal combustion engine and a process for operating it. The exhaust emission control has a particulate filter for filtering particulate matter from the exhaust of the internal combustion engine, at least one temperature sensor for detecting the temperature of the exhaust, an evaluation unit for evaluating the detected temperature, particularly with regard to a particulate mass burned during a regeneration operation of the particulate filter. The temperature sensor is positioned inside the particulate filter.
A system and related method for cleaning a particulate filter medium. The filter medium is cleaned by the input of energy to burn off particulate matter collected thereon. The system can comprise a thermocouple for monitoring the temperature of the filter medium at a plurality of locations. There is an electronic control unit for determining the point having a maximum individual temperature and creating a control signal commensurate with the maximum temperature. The control unit can determine if the control signal exceeds a predetermined set point level and if so reduces the energy input. The control unit also determines if the control signal falls within a predetermined range, also referred to as a band width of acceptable values less than the set point level. If the signal falls within the band width, the control unit controls the energy input and varies it as appropriate in order to maintain the control signal within the band width.
