A system and method for comprehensive treatment of marine diesel engine exhaust based on activated carbon oxidation and wet desulfurization and denitrification

Abstract

The invention discloses a marine diesel engine tail gas comprehensive treatment system and method based on activated carbon oxidation and wet desulfurization, denitrification and departiculate matter. The activated carbon oxidizer is arranged between the desulfurization tower and the denitration tower, the middle part of the activated carbon oxidizer is divided into a primary oxidizer and a secondary oxidizer, the primary oxidizer is located below the secondary oxidizer, and the Both the primary oxidizer and the secondary oxidizer are filled with activated carbon. The invention can meet the requirements of desulfurization and denitrification at the same time, and can simultaneously remove the particulate matter in the tail gas, the desulfurization rate is 100%, the denitrification rate is over 60%, the structure is compact, and the occupied area is small in the limited space of the ship.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a system and method for comprehensive treatment of marine diesel engine tail gas based on activated carbon oxidation and wet desulfurization and denitrification. Background technique [0002] The main power equipment of ocean-going ships is still diesel engine, which will produce particulate matter (PM), SO x and NO x . PM and SO emitted from marine diesel engines x , NO x They account for approximately 5%, 13% and 15% of total global emissions, respectively. In the total amount of global air pollution, ship exhaust accounts for about 5-11%. Nitrogen oxides and sulfur oxides not only produce acid rain, corrode buildings and soil, but also endanger human health, causing cancer, respiratory diseases and other diseases. MARPOL73 / 78 Convention Annex VI to NO x and SO x There are strict regulations on the emission of SO x The emission reduction requirements a...

AI Technical Summary

Problems solved by technology

If a particle filter is used, the back pressure of the diesel engine will increase, making the combustion conditions of the diesel engine worse

[0004] For the integrated tail gas removal technology, there is currently a combination of selective catalytic reduction technology and wet desulfurization to remove sulfur oxides, nitrogen oxides and some particulate matter. This method also has high catalyst prices and secondary waste caused by waste. pollution problem

In addition there is an O 3 A strong oxidizing agent will first oxidize NO into water-soluble NO 2 , and then through seawater NO x and SO x Removed at the same time, but due to the production of O 3 The cost is high and the applicability is not great

There is also the use of electrolysis of seawater to produce sodium hypochlorite to oxidize NO into high-valence nitrogen oxides, combined with wet desulfurization to oxidize SO x and NO x At the same time, the disadvantage of this method is that the energy consumption is relatively large

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