Patent ID: 7399455

Claim:
A process of removing substances entrained in an exhaust gas from a nonroad engine having an exhaust outlet to discharge said exhaust gas, comprising the steps of: (a) intaking said exhaust gas from said nonroad engine into a filter cavity containing a filter core therein, wherein said filter core has a plurality of air pores distributed; (b) diffusing said exhaust gas to said filter cavity through said pores while passing said exhaust gas through said filter core; (c) removing predetermined substances in said exhaust gas by chemically reacting said exhaust gas with a catalyzing element provided around aid air pores of said filter core to form a filtered exhaust gas; and (d) discharging said filtered exhaust gas from said filter cavity; wherein the step (b) further comprises the steps of: (b-1) guiding said exhaust gas to flow through said filter core in said filter cavity, wherein said filter core comprises a plurality of tubular filtering loops coaxially received in said filter cavity where said air pores are formed on said filtering loops for allowing said exhaust air passing therethrough, wherein said filter core further comprises a plurality of tubular filtering spacers each positioned between each said two filtering loops to define a plurality of axial air passages between said filtering spacers and said filtering loops so as to communicate with said air pores thereof, wherein a plurality of air meshes are formed on said filtering spacers to communicate with said air passages; and (b-2) evenly diffusing said exhaust gas to said filter cavity through said air pores and said air meshes by passing said exhaust gas through said air passages of said filter core so as to enhance a chemical reaction of said exhaust gas with said catalyzing element.