| 摘要 |
PURPOSE: To provide a simple-structured silencer unit for a large diesel engine that achieves sound silencing and is easily modified considering various needs for purifying exhaust gases. CONSTITUTION: In a hollow cylindrical body member 1a of a silencer unit 1, a group of sound silencing porous elements 4 having a flow channel of exhaust gases are arranged in successive order in the flow direction of exhaust gases longitudinally of the body member, and the exhaust gases are led through the flow channel of each element in order. The elements are installed inside the body member in the axial direction from one end thereof one at a time and are supported by a guiding and supporting member 3. In the upstream of flow direction of the body member, an exhaust tube 2 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 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. |
