Abstract: A ceramic honeycomb filter comprising pluralities of porous ceramic honeycomb structures 1A, 1B each having large numbers of flow paths 41, 42, 43 partitioned by cell walls 30, which are connected to each other in a flow path direction, desired flow paths being sealed such that an exhaust gas passes through pores of the cell walls 30, the cell walls 31 of at least one honeycomb structure 1A being connected by plugs 50 to the cell walls 32 of a honeycomb structure 1B adjacent thereto with a gap 54 in the flow path direction, and a catalyst being carried by at least part of the cell walls 30 and/or the plugs 50, 52, an exhaust gas-cleaning apparatus comprising the ceramic honeycomb filter and a fuel-adding means disposed upstream thereof, and an exhaust gas-cleaning method using the ceramic honeycomb filter.

Abstract: A ceramic honeycomb filter comprising a ceramic honeycomb structure having porous partition walls defining a plurality of flow paths for flowing an exhaust gas through the porous partition walls to remove particulates from the exhaust gas, the predetermined flow paths among the flow paths being sealed at their ends, a catalyst being carried by the porous partition walls, the porous partition walls having a porosity of 60-75% and an average pore diameter of 15-25 &mgr;m when measured according to a mercury penetration method, and the maximum of a slope Sn of a cumulative pore volume curve of the porous partition walls relative to a pore diameter obtained at an n-th measurement point being 0.

Abstract: An EGR cooler including a flat box shell having an inlet for introducing cooling water and an outlet for discharging the cooling water, plates positioned at axial open ends of the shell to close the axial open ends thereof, hoods positioned at sides of the plates away from the shell to enclose end faces of the plates, tubes extending within the shell and having ends penetrating through the plates, the tubes for passing exhaust gas from one hood to the other for thermal exchange with the cooling water, guide plates curved away from the axial extension of the shell toward longer sides of the end face of the shell and provided in the hood on an inlet side of the exhaust gas, a bar positioned between the guide plates and extending in a direction of shorter sides of the end face of the shell for dividing a stream of the exhaust gas.

Abstract: An EGR cooler including a flat box shell having an inlet for introducing cooling water and an outlet for discharging the cooling water, plates positioned at axial open ends of the shell to close the axial open ends thereof, hoods positioned at sides of the plates away from the shell to enclose end faces of the plates, tubes extending within the shell and having ends penetrating through the plates, the tubes for passing exhaust gas from one hood to the other for thermal exchange with the cooling water, guide plates curved away from the axial extension of the shell toward longer sides of the end face of the shell and provided in the hood on an inlet side of the exhaust gas, a bar positioned between the guide plates and extending in a direction of shorter sides of the end face of the shell for dividing a stream of the exhaust gas.

Abstract: An EGR cooler including a cylindrical shell having a cooling water inlet for introducing cooling water into the shell at one axial end, a cooling water outlet for discharging the cooling water from the shell at the other axial end, and a bypass outlet for pulling out part of the cooling water at a position diametrically opposed to the cooling water inlet, plates positioned at axial ends of the shell so as to close the axial ends of the shell, hoods positioned at sides of the plates away from the shell so as to enclose end faces of the plates, and tubes extending axially within the shell and having ends penetrating through the plates. The tubes passes exhaust gas from one of the hoods to the other hood for thermal exchange of the exhaust gas with the cooling water.

Abstract: A ceramic honeycomb filter comprising a ceramic honeycomb structure having porous partition walls defining a plurality of flow paths for flowing an exhaust gas through the porous partition walls to remove particulates from the exhaust gas, the predetermined flow paths among the flow paths being sealed at their ends, a catalyst being carried by the porous partition walls, the porous partition walls having a porosity of 60-75% and an average pore diameter of 15-25 &mgr;m when measured according to a mercury penetration method, and the maximum of a slope Sn of a cumulative pore volume curve of the porous partition walls relative to a pore diameter obtained at an n-th measurement point being 0.

Abstract: The invention relates to an EGR cooler in which cooling water is supplied into and discharged from a shell, exhaust gas being passed through tubes from one of hoods to the other hood for thermal exchange of the exhaust gas with the cooling water.