Wet desulfurization and denitrification integrated device and method for ship exhaust gas

Abstract

The invention belongs to the field of waste gas pollution control, and particularly relates to a ship waste gas desulfurization and denitrification integrated technology. The device comprises a comprehensive washing tower, a dust removal circulating system, a desulfurization circulating system and a denitration circulating system; the comprehensive washing tower is divided into three washing areas, namely a first-stage washing dust removal area, a second-stage washing desulfurization area and a third-stage washing denitration area in sequence from a waste gas inlet to a discharge outlet; the dust removal circulating system comprises a primary circulating pool, a primary circulating pump and a solid-liquid separator; the desulfurization circulating system comprises a secondary circulating pool and a secondary circulating pump; and the denitration circulating system comprises a regeneration electrolytic tank, a fluidizing pump, a cooling crystallizer, a three-stage circulating tank and a three-stage circulating pump. The process is simple, operation is stable, the desulfurization efficiency is larger than 98%, the denitration efficiency is larger than 80%, the desulfurization by-product serves as a reducing agent, the complexing denitration liquid is efficiently reduced and regenerated by combining the electrocatalytic reduction technology, and the content of nitrate in wastewater meets the requirement of the international maritime organization.

Description

Technical field [0001] The present invention relates to the field of exhaust gas pollution control, and more particularly to a debris debris deterification technique for ship exhaust gas. Background technique [0002] Ship exhaust emissions SO 2 NO x The pollution caused by regional environments and marine atmosphere is increasingly serious. To this end, international maritime organizations have developed an international convention that prevents airborne pollution from Marrpol Convention with the Marpol Convention. The Convention on the limit of sulfur oxide emission is implemented on January 1, 2020, and the performance technology represented by the exhaust gas cleaning system has developed mature. The main methods include seawater law, freshwater + magnesium hydroxide and magnesium-based - seawater law Among them, the magnesium-based-seawater law is high due to high desulfurization efficiency, low operating costs, and high strength, and gradually become the development trend o...

AI Technical Summary

Problems solved by technology

The improvement plan of the research group, CN201310138931.3 discloses a method of using limestone to desulfurize the remaining SO 2 Combining complexation absorption-activated carbon catalytic electrochemical assisted reduction technology to achieve desulfurization and denitrification, but the limestone desulfurization process cannot be applied to ships because the by-product gypsum occupies too large an area, and the catalyst used in this patent is only activated carbon. , the reduction selectivity is not high, prone to side reactions to generate NH 4 + , N 2 O and other substances, resulting in secondary pollution

[0004] To sum up, there is a lack of an integrated system for wet desulfurization and denitrification of ship exhaust gas with high efficiency, reliable operation, low cost, and at the same time ensuring that the waste water is discharged up to the standard.

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