Quick preheating technology and system of marine selective denitration SCR catalyst

Abstract

The invention discloses a quick preheating technology and system of marine selective denitration SCR catalyst. The technology comprises the steps that heat storage is performed through at least one heat accumulator; flue gas is fed into an SCR reactor through a flue gas pipeline; the flue gas treated through the SCR reactor is fed into the heat accumulator through the flue gas pipeline; outdoor air is fed into the heat accumulator through an air preheating pipeline and enters the SCR reactor from the upper part to the lower part or from the lower part to the upper part; a catalyst bed is heated; when the temperature of the catalyst bed does not rise any more, the original operated heat accumulator is closed, a new heat accumulator is opened, and the direction of the air is changed and the air enters the SCR reactor to preheat the catalyst bed; after a plurality of times of forward and reversed preheating processes, a whole set of air preheating system is closed till the operation of any heat accumulator can not further increase the weighted mean temperature of the catalyst bed. The system overcomes the problem that the temperature of catalyst is lower than an SCR reaction temperature interval as a ship is frequently started and stopped and operated at idle speed.

Description

technical field [0001] The invention belongs to the technical field of flue gas denitrification, and in particular relates to a rapid preheating process of a marine selective denitrification SCR catalyst and a system thereof. Background technique [0002] With the increasingly stringent emission standards for combustion equipment on ships, the exhaust purification of boilers, diesel engine main engines, auxiliary engines, etc. on ships will become the focus of environmental protection. Different from the relatively continuous and stable flue gas emission process of land-based coal-fired thermal power plants, the smoke exhaust purification of ships has its own characteristics: the main fuel on ships is diesel, and there are frequent start and stop during operation. This will cause fluctuations in the flue gas volume, flue gas temperature and the internal temperature environment of the flue gas purification equipment, thereby reducing the utilization rate and purification effi...

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Problems solved by technology

[0008] The purpose of the present invention is to provide a rapid preheating process for a marine selective denitrification SCR catalyst to solve the problem that the catalyst temperature is lower than the SCR reaction temperature range due to frequent start and stop of the ship, idling, etc.

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