초록 ▼

A method for utilizing a silencer unit attached to an exhaust tube in a large diesel engine, and an exhaust gas system for applying the method in practice, in which the silencer unit includes a substantially hollow, preferably cylinder formed body member, inside of which a set of sound silencing por

A method for utilizing a silencer unit attached to an exhaust tube in a large diesel engine, and an exhaust gas system for applying the method in practice, in which the silencer unit includes a substantially hollow, preferably cylinder formed body member, inside of which a set of sound silencing porous elements can be fitted, said elements including a flow channel for the exhaust gases and being arranged in successive order in the flow direction of the exhaust gases longitudinally of the body member so that the exhaust gases are led through the flow channel of each element one after the other. Said elements are installed inside the body member in the axial direction from one end thereof one at a time and are supported to the inner mantle surface of the body member. In the flow direction upstream of the body member the exhaust tube is provided with means for feeding a medium containing ammonium, urea or the like reagent applicable for catalytic depuration into the exhaust gases. In addition at least one of the said elements in the body member is selected so that in a cross-sectional plane of the body member it covers the whole flow area of the exhaust gases and provides an exhaust gases depurating, catalytic reaction especially for decreasing the NOx-content of the exhaust gases.

대표청구항 ▼

[ What is claimed is:] [1.] A method for utilizing a silencer unit attached to an exhaust tube of a large diesel engine, said silencer unit including a substantially hollow body member having an inner mantle surface that bounds an interior space, the body member having an exhaust gas inlet and an ex

[ What is claimed is:] [1.] A method for utilizing a silencer unit attached to an exhaust tube of a large diesel engine, said silencer unit including a substantially hollow body member having an inner mantle surface that bounds an interior space, the body member having an exhaust gas inlet and an exhaust gas outlet, whereby exhaust gas is able to flow through the interior space of the hollow body member in a flow direction from the exhaust gas inlet to the exhaust gas outlet, said method comprising:providing a plurality of porous sound silencing elements, wherein at least one of said sound silencing elements is suitable for catalytic depuration of the exhaust gas by reaction with a catalytic depuration reagent and is sized and shaped to extend over substantially the entire cross-sectional area of the interior space when it is installed in the interior space of the hollow body member, whereby exhaust gas that flows through the hollow body member from the exhaust gas inlet to the exhaust gas outlet when said one sound silencing element is so installed passes through said one sound silencing element,providing the exhaust tube of the engine with means for feeding said catalytic depuration reagent into the exhaust gas upstream of the silencer unit, andinstalling the sound silencing elements in the interior space of the hollow body member so that they are supported relative to the hollow body member and are arranged in successive order in said flow direction.