SCR denitration reducing agent preparation device with flue gas heating system and method

Abstract

The invention discloses an SCR denitration reducing agent preparation device with a flue gas heating system and a method. The preparation of an SCR denitration reducing agent is completed by utilizing the flue gas heating system. A reducing agent solution is directly sprayed into a high-temperature flue of a flue gas heating system, ammonia gas evaporated from high-temperature flue gas is mixed with the high-temperature flue gas and then fed into an original flue gas flue through the high-temperature flue to be mixed with original flue gas, a reducing agent required by denitration is provided, and the reducing agent solution can be ammonia water or a urea solution. Compared with a traditional SCR denitration reducing agent preparation system, an evaporator, an ammonia-air mixer, a dilution fan, a dilution air heating device, an ammonia spraying grid and the like do not need to be arranged, and the system has the advantages of being simple, easy to control, small in investment and the like.

Description

technical field [0001] The invention relates to an SCR denitrification reducing agent preparation device and method with a flue gas heating system, and is particularly suitable for the technical field of low-temperature flue gas SCR denitrification. Background technique [0002] At present, the preparation methods of SCR denitrification reducing agent mainly include liquid ammonia method, ammonia water method and urea method. The liquid ammonia method or ammonia water method usually uses steam or hot flue gas as a heat source, and ammonia gas is generated through an evaporator. The urea method can be divided into hydrolysis method and pyrolysis method. The hydrolysis method uses high-pressure steam as the heat source to generate ammonia gas through a hydrolyzer; the pyrolysis method usually uses gas or oil as fuel to generate ammonia gas through a pyrolysis furnace. The ammonia gas prepared by the above process is mixed with the dilution wind to form a mixed gas with an ammo...

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Problems solved by technology

[0003] The systems of the above three methods are relatively large, especially the urea method, which is extremely complex and requires an external heat source or fuel. At the same time, it also needs to be equipped with an evaporator pyrolyzer, an ammonia-air mixer, a dilution fan, a dilution air heating device, and a sprayer. Ammonia grill, etc.

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