Catalytic membrane contactor and gas desulfurization and denitrification method

Abstract

The invention relates to a catalytic membrane contactor for desulfurization and denitrification of ship tail gas, and the simultaneous desulfurization and denitrification process is realized by using the membrane contactor for tail gas containing sulfur and nitrate. The membrane contactor consists of a cylinder, ceramic membrane tubes and catalyst plates. The upper and lower ends of the barrel are respectively provided with a gas feed port and a gas discharge port, and a denitrification catalyst is loaded on the catalyst plate. The desulfurization and denitrification coupling process uses the above-mentioned membrane contactor. The absorbent is injected from the liquid inlet head, flows out from the liquid outlet head through the ceramic membrane tube, and then enters the absorption liquid cooler and then circulates into the catalytic membrane contactor. The tail gas enters the catalytic membrane contactor through the gas inlet, and is discharged from the gas outlet after reacting in the contactor. In this process, the absorbent is mainly used for desulfurization and solving the problem of ammonia escape, and the supported catalyst is mainly used for catalytic denitrification. The method couples the SCR technology with the membrane absorption technology, and has the advantages of high integration, strong controllability, high removal efficiency, compact structure and easy enlargement, and improved desulfurization and denitrification efficiency.

Description

technical field [0001] The invention relates to a catalytic membrane contactor used for desulfurization and denitrification of ship tail gas, in particular to a simultaneous desulfurization and denitrification process using the catalytic membrane contactor for tail gas containing sulfur and nitrate. Background technique [0002] Nitrogen oxides (NO, NO 2 , N 2 O etc., referred to as NO x ) is one of the main air pollutants. In recent years, the country has paid more and more attention to the problem of environmental pollution, such as NO from mobile sources such as ships x Emission standards are also getting stricter. During the operation of the diesel engine, NO x The main reason is that nitrogen reacts with oxygen in the air under high temperature and pressure, so it is impossible to eliminate NO from the source x generation. The tail gas must be denitrified, and selective catalytic reduction (SCR) is the treatment of NO x effective method. [0003] According to th...

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Problems solved by technology

The method of this patent mainly uses sodium hydroxide solution as the absorbent to absorb the exhaust gas. However, this method will need to remove nitrogen oxides and sulfur oxides through membrane absorption at the same time, which will easily lead to The problem of low absorption efficiency and poor removal rate

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