Selective catalytic reduction (SCR) reactor diversion device for marine diesel engine

Abstract

The invention relates an SCR reactor diversion device for a marine diesel engine, and belongs to the technical field of hydromechanics application. The device comprises diversion rings, diversion plates, front supporting plates and rear supporting plates. The number of the diversion rings is two or more than two, and the diversion rings are provided with conical curve surfaces and arranged front and back coaxially. The diversion plates are radially arranged on the circumferences of the diversion rings, and the diversion rings are fixed and connected into a whole through the diversion plates. The integral diversion device is fixedly mounted in an expansion cavity through the front supporting plates and rear supporting plates. The diversion rings form a multilayer curve surface structure in the expansion cavity and divide the longitudinal section of the expansion cavity into areas with different expansion angles to improve the internal flow field radial non-uniformity of the expansion cavity; and the diversion plates in slab structures divide the cross section of the expansion cavity into a plurality of areas with equal areas so as to improve the internal flow field circumferential non-uniformity of the expansion cavity.

Description

technical field [0001] The invention belongs to the technical field of fluid mechanics application, and in particular relates to a diversion device for an SCR reactor of a marine diesel engine. Background technique [0002] Selective Catalytic Reduction (SCR, short for Selective Catalytic Reduction) technology is the mainstream technology for exhaust gas treatment of marine diesel engines. The uniformity of the flow field of the SCR reactor is its core technology. If the flow rate of exhaust gas entering the catalyst pores is not uniform, part of the exhaust gas in the area with too high velocity will be discharged before it can react, and the catalytic capacity in the area with too low velocity will not be fully utilized, thereby reducing the performance of the reactor. Usually, in order to ensure uniform flow rate of the exhaust gas entering the catalyst pores, the expansion angle of the expansion chamber cannot be too large, but this will cause the axial dimension of the...

AI Technical Summary

Problems solved by technology

If the flow rate of exhaust gas entering the catalyst pores is not uniform, some exhaust gas in the area with too high velocity will be discharged before it can react, and the catalytic capacity in the area with too low velocity will not be fully utilized, thus reducing the performance of the reactor.

Usually, in order to ensure that the flow rate of exhaust gas entering the catalyst channel is uniform, the expansion angle of the expansion chamber cannot be too large, but this will cause the axial dimension of the expansion chamber to be too large, which affects the shipping application of the SCR system

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