Catalyst structure
View Patent ↗Provided is a catalyst structure which prevents an increase in pressure loss by a simple construction while the gas flow is efficiently stirred by a structure making contact between adjacent catalyst elements. The catalyst structure is provided with a first flat-plate part and a second flat-plate part which support, on surfaces thereof, a constituent having catalytic activity to an exhaust gas and face each other, and a stirring part which is provided in such a manner as to come into contact first with the first flat-plate part and the second flat-plate part in an extending manner from the first flat-plate part to the second flat-plate part at a prescribed angle with respect to the direction in which the exhaust gas flows.
1. A catalyst structure, comprising: multiple catalyst elements, each having a flat-plate part which supports, on a surface thereof, a constituent having catalytic activity to an exhaust gas, and a plurality of spacers extending in a direction in which the exhaust gas flows and arranged on the flat-plate part equidistantly in a direction perpendicular to a flow of the exhaust gas,
the catalyst elements being stacked via the spacers and formed with a stirring part for stirring the exhaust gas, the stirring part being provided in a gas flow passage formed by two of the flat-plate parts adjacent in a stacking direction of the catalyst elements and two consecutive spacers of the plurality,
the stirring part having: a plurality of consecutive lead parts formed at prescribed intervals in the direction in which the exhaust gas flows by folding an incision provided in a flat-plate part of each of the gas flow passages, and a plurality of openings formed by the incisions of the lead parts,
each of the lead parts having a width in a direction perpendicular to the flow of the exhaust gas, and being folded in substantially a same direction with respect to a direction in which a downstream side of the exhaust gas flows,
adjacent catalyst elements being arranged so that the lead parts are present alternately in the direction in which the exhaust gas flows; and
wherein the catalyst elements adjacent in the stacking direction are arranged so that the lead parts formed in one of the catalyst elements is present in a position corresponding to a flat part between two of the lead parts, adjacent in a direction in which the exhaust gas flows, of the other of the catalyst elements.
2. The catalyst structure according to claim 1 , wherein the lead parts of each catalyst element extend into contact with the flat-plate parts of an adjacent catalyst element.
3. The catalyst structure according to claim 1 , wherein a length of each lead part between two adjacent catalyst elements is not less than 5 times but not more than 10 times an interval between the two adjacent catalyst elements.
4. The catalyst structure according to claim 1 , wherein the lead parts are folded at a prescribed angle not less than 7° but not more than 30°.
5. The catalyst structure according to claim 1 , wherein the stirring parts are present in multiple numbers in the direction in which the exhaust gas flows, and intervals between consecutive stirring parts are not less than 30 mm but not more than 100 mm.
6. The catalyst structure according to claim 1 , wherein the width of the lead parts is not less than ⅕ but not more than ½ of a width of the gas flow passage.