Sulfur poisoning removal device of SCR catalyst of diesel engine and using method for sulfur positioning removal device

Abstract

The invention discloses a sulfur positioning removal device of a SCR catalyst of a diesel engine. The sulfur positioning removal device comprises a DOC, a DPF, the SCR catalyst, a bypass pipeline with an electric-control regulating valve and a post-processing controller, wherein a gas inlet end of the DOC sequentially communicates with an engine exhaust tube through a gas inlet pipeline and a turbocharger; a gas outlet end of the DOC communicates with the SCR catalyst through the DPF; a gas inlet and a gas outlet end of the bypass pipeline separately communicate with the exhaust tube and the gas inlet pipeline; a temperature sensor I, a NOX sensor I and a DPF regenerated fuel oil spray nozzle are arranged on the gas inlet pipeline; a gas inlet end and a gas outlet end of the DPF are equipped with the pressure sensors; and a gas inlet end and a gas outlet end of the SCR catalyst are separately equipped with a temperature sensor II and an NOX sensor II. In use, the post-processing controller controls the DPF regenerated fuel oil spray nozzle and an electric-control regulating valve according to a condition that whether DPF regeneration is needed or not and an operation condition of the diesel engine, so that high-temperature conditions of SCR catalyst desulfurization are met. With the adoption of the design, economical deterioration degree of the engine fuel oil is relatively low.

Description

technical field [0001] The invention belongs to the field of post-treatment of diesel engine exhaust, in particular to a device for eliminating sulfur poisoning of an SCR catalytic converter of a diesel engine and a method for using the same, which is suitable for reducing the degree of deterioration of engine fuel economy. Background technique [0002] In response to increasingly stringent emission regulations, heavy-duty diesel engines generally adopt DOC+DPF+SCR+ASC post-treatment systems after the Euro VI stage, among which Selective Catalytic Reduction (SCR) is the most effective way for diesel engines to meet NOx emission targets. one of the technologies. In the Euro VI post-treatment system, the influence of DPF regeneration temperature on SCR, NO X Due to the demand for high conversion efficiency and other reasons, copper-based zeolite SCR is widely used in the market. However, copper-based zeolite-type SCR has the problem of sulfur poisoning. Test data show that t...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem of high engine fuel economy deterioration in the prior art, and provide a diesel engine SCR catalytic converter sulfur poisoning elimination device with simple structure and low engine fuel economy deterioration and its use method

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