Exhaust gas cleaning system and method for cleaning exhaust gas and use of exhaust gas cleaning system

A method for cleaning exhaust gas by a particle filter device, the particle filter device comprising

• a casing having an inner surface,
• a plurality of hollow, ceramic, gas permeable filter rods arranged at least partly inside an exhaust gas passage of the casing, the filter rods having a lengthwise extent and longitudinally extending essentially vertically and along each other,
• an exhaust gas inlet arranged to allow exhaust gas to flow into the casing upstream of said exhaust gas passage, the exhaust gas inlet intersecting the inner surface of the casing at an intersection,
• an exhaust gas outlet arranged to allow exhaust gas to flow out of the casing downstream of said exhaust gas passage, and
• a perforated plate arranged downstream of the exhaust gas inlet and upstream of said exhaust gas passage, which perforated plate extends at least partly along the lengthwise extent of said filter rods and partly blocks an exhaust gas flow path from the exhaust gas inlet to said exhaust gas passage, the perforated plate having an upper half and a lower half, the upper half of the perforated plate being located between two imaginary separated horizontal planes defining upper and lower boundaries of the upper half of the perforated plate,
• which method comprises
• feeding exhaust gas into the casing so that all of the exhaust gas entering the casing from the exhaust gas inlet enters the casing at a location between the two imaginary separated horizontal planes defining the upper and lower boundaries of the upper half of the perforated plate,
• feeding exhaust gas through openings of the perforated plate into said exhaust gas passage, with the exhaust gas that has been fed through the openings of the perforated plate contacting an outer surface of a respective wall of said filter rods,
• filtering exhaust gas by allowing it to penetrate the respective wall of said filter rods and flow into said filter rods,
• releasing exhaust gas through a respective open upper end of the filter rods, and
• feeding exhaust gas out of the casing.

An exhaust gas cleaning system for cleaning exhaust gas, which exhaust gas cleaning system comprises:

• a particle filter device, the particle filter device comprising:
• a casing,
• a plurality of hollow ceramic filter rods arranged at least partly inside an exhaust gas passage of the casing and longitudinally extending essentially vertically and along each other,
• an exhaust gas inlet arranged to allow exhaust gas to flow into the casing upstream of said exhaust gas passage,
• an exhaust gas outlet arranged to allow exhaust gas to flow out of the casing downstream of said exhaust gas passage,
• the particle filter device being configured to guide exhaust gas from the exhaust gas inlet, through said exhaust gas passage and to the exhaust gas outlet, the particle filter device further comprising
• a perforated plate arranged downstream of the exhaust gas inlet and upstream of said exhaust gas passage, which perforated plate extends at least partly along said filter rods and partly blocks an exhaust gas flow path from the exhaust gas inlet to said exhaust gas passage, the perforated plate having a vertically uppermost portion positioned in the casing, a vertically lowermost portion positioned in the casing and a vertically middle portion between the vertically uppermost portion and the vertically lowermost portion, the perforated plate being positioned relative to the exhaust gas inlet such that a straight line passing through a center of the exhaust gas inlet intersects the vertically uppermost portion of the perforated plate,
• the perforated plate defining openings arranged to allow exhaust gas to flow into said exhaust gas passage, said filter rods being gas permeable to allow exhaust gas to penetrate, during filtration, a respective wall of said filter rods and flow into said filter rods, and a respective open upper end of the filter rods being in communication with said exhaust gas outlet so as to allow exhaust gas to leave the casing.