Integrated device and method for desulphurization and denitrification of ship exhaust gas by ammonia method

Abstract

The invention provides an integrated device and method for desulphurization and denitrification of ship exhaust gas by an ammonia method. The integrated device comprises a gas cooler, a washing towerand a NO oxygenizer and further comprises a wastewater treatment unit and a wastewater neutralization reaction unit; a marine diesel engine is communicated with a smoke three-way valve, one path of the smoke three-way valve is directly communicated to the atmosphere while the other path is communicated to the gas cooler, the gas cooler is communicated to the bottom of the washing tower through washing-tower smoke stop valve, the NO oxygenizer is connected to the top of the washing tower, a smoke one-way valve is communicated with the NO oxygenizer and the wastewater treatment unit, and the wastewater treatment unit is connected with the wastewater neutralization reaction unit. The integrated device and method is high in SO2 and NO efficiency, good in economy efficiency, simple in system composition and free of secondary pollution, treated washing water does not contain nitrate, and IMO (international maritime organization) wastewater discharge related control standards are fully met.

Description

technical field [0001] The invention relates to a tail gas desulfurization and denitrification method and device, in particular to an ammonia-based ship tail gas desulfurization and denitrification integrated method and device, belonging to the technical field of diesel engine tail gas purification. Background technique [0002] With the increase of world trade volume, the volume of goods between countries has increased sharply, and sea freight undertakes more than 90% of the world's cargo transportation. Due to its good performance, diesel engines are widely used as propulsion power devices for ships, and marine diesel engines will produce a large amount of NO and SO in the process of work. 2 , these harmful gases will pose a great threat to human health and the natural environment. The International Maritime Organization (IMO) has always had strict restrictions on ship emissions, and many scientific research institutions at home and abroad are committed to related researc...

AI Technical Summary

Problems solved by technology

In the denitrification scrubber, a part of NO 2 will be with H 2 O reacts to form HNO 3 and NO, the exhaust gas will contain a large amount of NO, and there will be nitrate in the washing water, which will cause secondary pollution; and phenylenediamine is a toxic chemical substance that will seriously threaten the health of the crew

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