Selective catalytic reduction (SCR) after-treatment system urea supply device and treatment method

Abstract

The invention discloses a selective catalytic reduction (SCR) after-treatment system urea supply device and a treatment method. The device comprises a urea tank which is connected with at least two urea metering pumps in parallel through wiring harnesses and pipelines. By the adoption of the technical scheme, the SCR after-treatment system urea supply device and the treatment method have the following technical effects that a single urea metering pump is changed into the two or more urea metering pumps connected in parallel, the multiple small-power urea metering pumps for vehicles are combined into a whole to replace a large-power urea metering pump, and therefore mass production of the urea metering pumps is facilitated, and production cost is remarkably reduced; in addition, after the urea metering pumps are connected in parallel, the number of the urea metering pumps can be increased or decreased according to the power requirement, so that flexibility, convenience and interchangeability of designing and matching are greatly improved; and the matching attribute of the urea demand quantity of an engine and the supply quantity of the urea metering pumps is better, the requirement for the power of different engines can be met, energy saving performance is good, consumption can be reduced effectively, and operation is reliable.

Description

technical field [0001] The invention relates to a non-vehicle heavy-duty diesel SCR post-treatment system urea supply device and a treatment method, belonging to the technical field of engine exhaust purification treatment. Background technique [0002] Due to the incomparable advantages of gasoline engines in terms of power, economy and reliability, diesel engines are widely used in ships, generator sets, train engines, mining machinery, and large construction machinery, especially because of their extremely low carbon dioxide emissions. The harm caused by diesel engine exhaust pollution has attracted increasing attention. [0003] The International Maritime Organization has implemented the IMO Tier II emission law since January 1, 2011. From January 1, 2016, Tire III emission standards will be implemented in the control area. The increasingly stringent national emission regulations have prompted domestic diesel engine manufacturers to find effective ways to control and r...

AI Technical Summary

Problems solved by technology

[0006] At present, installing a set of SCR post-treatment system will increase the cost of the whole ship by about 3%-5%. At the same time, it will also produce urea consumption with a fuel consumption ratio of 2%-5%. There are additional costs such as later use and maintenance

This series of additional economic expenditure is also an important factor hindering its development and promotion. Therefore, it is an urgent problem for manufacturers to effectively reduce the cost of SCR after-treatment systems on the basis of ensuring product quality.

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