Patent ID: 9562451
Date: 2017-02-07
CPC Classifications: F01N,Y02T

Claim:
1. Method for removal of soot, hydrocarbons, ash and heavy metals being present in exhaust gas from an engine operated on heavy fuel oil with a sulphur content 0.1% to 4.0 wt % and a heavy metal element content of 5 mg/kg to 1000 mg/kg, comprising the steps of: operating the engine at a load to obtain an exhaust temperature of the exhaust gas of at least 325° C.; passing the exhaust gas at exhaust gas temperature 325° C. to 550° C. through the at least one filter unit each comprising at least one particulate filter and capturing the soot, ash and heavy metals contained in the exhaust gas, wherein the one or more filtration units are arranged in a pressure vessel upstream an engine turbocharger; continuously burning the captured soot and adhered hydrocarbons off the at least one particulate filter by contact with a catalyst being arranged on the filter; periodically disconnecting the at least one filter unit from flow of the exhaust gas unit and closing outlet of the at least one particulate filter; subsequently pulse injecting air into the closed outlet of the at least one particulate filter in reverse to the previous flow of the exhaust gas and blowing the captured ash together with the heavy metals off the at least one particulate filter.