Ship exhaust gas denitration system

Abstract

The invention provides a ship exhaust gas denitration system. The ship exhaust gas denitration system comprises an exhaust gas denitration pipeline, an exhaust gas bypass pipeline, a denitration reactor, a heating pipeline and a heating bypass pipeline, wherein the exhaust gas denitration pipeline is connected with an exhausting end of a diesel engine through a first valve; the exhaust gas bypass pipeline is connected with the exhausting end of the diesel engine through a second valve; the denitration reactor is connected into the exhaust gas denitration pipeline; the heating pipeline is connected with an incinerator through a third valve; the heating bypass pipeline is connected with the incinerator through a fourth valve; when the first valve and the third valve are opened and the second valve and the fourth valve are closed, exhaust gas of the incinerator and exhaust gas of the diesel engine are mixed in the exhaust gas denitration pipeline and the temperature of the exhaust gas is adjusted; then the exhaust gas enters the denitration reactor to be denitrated; when the first valve and the third valve are closed and the second valve and the fourth valve are opened, the exhaust gas of the incinerator and the exhaust gas of the diesel engine are exhausted by the heating bypass pipeline and the exhaust gas bypass pipeline respectively. The heating pipeline is connected with the incinerator and the exhaust gas denitration pipeline and heating and temperature regulation are carried out by utilizing temperature difference of the exhaust gas of the incinerator and the exhaust gas of the diesel engine, so that the temperature of the mixed exhaust gas meets reaction requirements of the reactors.

Description

technical field [0001] The invention relates to the field of atmospheric environment protection, in particular to a ship exhaust gas denitrification system. Background technique [0002] According to the requirements of the amendments to the Regulations for the Prevention of Air Pollution from Ships in Annex VI of the MARPOL 73 / 78 Convention adopted by the International Maritime Organization (IMO), the nitrogen oxides in the exhaust gas of ships must be treated to meet the standards before they can be discharged. For low-speed marine diesel engines (speed n<130rpm), the nitrogen oxide content after treatment should be less than 3.4g / kwh, but for current low-speed diesel engines, this emission requirement cannot be met only by optimizing the combustion method of diesel engines. Therefore, marine diesel engines must be equipped with marine exhaust gas denitrification systems, and Selective Catalytic Reduction (SCR) technology is currently the most applicable diesel engine p...

AI Technical Summary

Problems solved by technology

However, the use of burners requires new equipment, and at the same time fuel consumption is large, increasing energy consumption and cost

[0004] On the other hand, waste oil, sludge, plastic, cardboard, cans, food waste and other garbage on board need to be disposed of by increasing incinerator incineration, and the current treatment method for incinerator exhaust gas is to reduce the temperature of the exhaust gas to 350°C to avoid the formation of dioxin, and then directly discharged into the atmosphere, which not only causes heat loss, but also causes NO in the exhaust gas X air pollution

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