Tail gas circulating treatment system of ship denitrating system based on SCR

Abstract

The invention relates to a tail gas circulating treatment system of a ship denitrating system based on SCR. The ail gas circulating treatment system of the ship denitrating system based on SCR comprises a power releasing device and a tail gas circulating retreatment device. The power releasing device comprises an air extracting device which is arranged at an outlet of a flue gas denitrating pipeline. The air extracting device comprises a sucking pump, a sucking pump starting and stopping controller, a sucking pump power detecting device and a diesel engine load detecting device. The tail gas circulating retreatment device comprises an ammonia spraying grille and the ammonia spraying grille communicates with the flue gas denitrating pipeline through an ammonia gas pipeline. The system has the advantages that the problem of diesel engine power loss caused by a SCR denitrating device can be well solved and the tail gas after reaction can be retreated by circulating denitrating to reach anemission standard when the concentration of nitrogen oxide in the tail gas subjected to SCR treatment does not reach the emission standard.

Description

technical field [0001] The invention belongs to the related technical field of fuel oil or gas generating sets, and relates to a marine diesel engine tail gas desulfurization and denitrification device, in particular to an SCR-based tail gas circulation treatment system of a ship denitrification system. Background technique [0002] With the development of international trade and ship transportation, the exhaust gas emissions from ships fueled by petroleum products are becoming more and more serious to the current pollution. Air pollution from ships has reached a level that cannot be ignored, especially in ports, straits, and some sea areas with dense routes and high ship traffic. The exhaust gas emitted by ships has even become the main source of pollution in this area. The engine exhaust denitration system in the prior art is mainly composed of an engine or a generator set, and a denitration device (catalytic reduction device, SCR for short). Such a design has great disad...

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Problems solved by technology

The amount of ammonia gas introduced, the temperature in the SCR reactor, and the degree of contact between the mixed gas and the catalyst will directly affect the denitrification rate of the tail gas. When the reaction is incomplete, the content of nitrogen oxides in the treated tail gas does not reach the emission level. At this time, if the gas after the reaction is discharged directly, it will pollute the atmosphere with a lot of noise

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