Diesel engine high-pressure SCR air exchange and pressure stabilization system

Abstract

The invention discloses a diesel engine high-pressure SCR air exchange and pressure stabilization system. The diesel engine high-pressure SCR air exchange and pressure stabilization system comprises an SCR reactor, an air inlet pipe, an exhaust pipe, a differential pressure sensing device and a control device, wherein the air inlet pipe and the exhaust pipe are connected with an air inlet and an exhaust port of the SCR reactor; a first control valve is arranged on the air inlet pipe, and a second control valve is arranged on the exhaust pipe; the control device is connected with the differential pressure sensing device, the first control valve and the second control valve; the control device controls the first control valve and the second control valve to be turned on, the SCR air exchangeand pressure stabilization system starts air exchange, and tail gas is driven by compressed air flowing in from the air inlet pipe to be discharged from the exhaust pipe; after completion of air exchange, the control device turns off the second control valve and controls whether to turn on the second control valve according to the flow of the compressed air, controlled by the differential pressure sensing device, getting into the SCR reactor so as to maintain the gas differential pressure of the SCR reactor and the exhaust side of a diesel engine within a preset differential pressure range. The diesel engine high-pressure SCR air exchange and pressure stabilization system achieves the quick air exchange effect and ensures the differential pressure control accuracy and stability.

Description

technical field [0001] The invention relates to the technical field of diesel engine tail gas treatment, and more particularly relates to a diesel engine high-pressure SCR ventilation and pressure stabilization system. Background technique [0002] Using SCR (Selective Catalytic Reduction, Selective Catalytic Reduction) is marine diesel engine exhaust NO X The mainstream technology of post-processing. Existing SCR ventilation devices usually install a throttling orifice at the inlet and outlet of compressed air to keep the compressed air purging, but this structure has poor sealing performance, slow ventilation speed, large air consumption, and system instability. defect. [0003] Therefore, it is necessary to provide an improved diesel engine high-pressure SCR ventilating and stabilizing system to at least partly solve the above-mentioned problems. Contents of the invention [0004] A series of concepts in simplified form are introduced in the Summary of the Invention,...

AI Technical Summary

Problems solved by technology

Existing SCR ventilation devices usually install a throttling orifice at the inlet and outlet of compressed air to keep the compressed air purging, but this structure has poor sealing performance, slow ventilation speed, large air consumption, and system instability. defect

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