Marine diesel engine high-pressure SCR ventilation pressure stabilizing system and ship

Abstract

The invention provides a marine diesel engine high-pressure SCR ventilation pressure stabilizing system and a ship. The system comprises an SCR reactor, an air inlet pipeline, an air exhaust pipeline, a bypass pipeline, a pneumatic pipeline, a first auxiliary pipeline and a second auxiliary pipeline, wherein when tail gas of a diesel engine needs to be subjected to denitrification treatment, the tail gas can enter from a flue gas inlet, sequentially passes through the air inlet pipeline, the SCR reactor and the air exhaust pipeline and is exhausted from a flue gas outlet, and the tail gas can be subjected to the denitrification treatment in the SCR reactor; and when the tail gas of the diesel engine does not need to be subjected to the denitrification treatment, the tail gas can enter the bypass pipeline from the flue gas inlet and is exhausted from the flue gas outlet, and at the moment, the tail gas in the SCR reactor and the tail gas in the air exhaust pipeline are pushed by compressed air entering from the first auxiliary pipeline and the second auxiliary pipeline to be exhausted from the flue gas outlet. According to the system, an original inlet air pipeline is omitted, a structure of the whole system is simplified, the whole system is more compact, sufficient air exchange is guaranteed, and meanwhile air consumption is reduced.

Description

technical field [0001] The present invention generally relates to the technical field of post-treatment of marine diesel engine exhaust, and more specifically relates to a high-pressure SCR (Selective Catalytic Reduction, selective catalytic reduction technology) ventilating and stabilizing system for marine diesel engines and a ship. Background technique [0002] Selective Catalytic Reduction (SCR) technology is aimed at NOx in diesel engine exhaust emissions X A treatment process, that is, under the action of a catalyst, the reducing agent ammonia or urea is injected to remove the NO in the tail gas X reduced to N 2 and H 2 O. The use of SCR is marine diesel engine exhaust NO X The mainstream technology of post-processing. The SCR urea supply and injection system is the core component of the SCR system, and it is the actuator that realizes urea solution supply, precise metering and atomized injection. [0003] In the prior art, in a marine diesel engine equipped with...

AI Technical Summary

Problems solved by technology

At the current stage, it is often used to add a throttle orifice to the compressed air inlet and outlet pipes, and to continuously blow it. However, this method is usually not sufficient for ventilation and has poor reliability.

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