Industrial furnace sulfur trioxide pre-removing and denitration device and method

Abstract

The invention discloses an industrial furnace sulfur trioxide pre-removing and denitration device and method. Low-temperature denitration is performed after pre-removing of sulfur trioxide. The device is composed of a pipeline, a sulfur trioxide removing tower, an induced draft fan, an ammonia ejecting device, a process water nozzle, a rectifier, smoke detection equipment, a valve and a flowmeter. The industrial furnace sulfur trioxide pre-removing and denitration device and method has the advantages that the sulfur trioxide removing tower is additionally mounted in front of a denitration reaction tower, so that service life of a catalyst is prolonged; the device can realize part dedusting effect; in addition, an ammonia spraying device in the denitration reaction tower is abandoned, structural design of the denitration reaction tower is optimized, and catalyst layer number, type and structural form in the denitration reaction tower are designed according to working conditions and activity and using amount of the catalyst. Denitration efficiency reaches higher than 90%, ammonia escape amount is less than 3.8 mg / m3, and the device is still stable and efficient when running time exceeds 20 h.

Description

technical field [0001] The invention belongs to the purification treatment of nitrogen oxides in the technical field of environmental protection, and relates to the purification of nitrogen oxides in industrial furnaces, in particular to a device and method for pre-removing sulfur trioxide and denitrification in industrial furnaces. Background technique [0002] In the production process of industrial furnaces, the pollutants produced by fuel combustion include smoke, SO 2 , NO x , HCl and HF and a small amount of heavy metals, etc. Taking glass furnaces as an example, the flat glass industry belongs to the basic raw material industry and is closely related to the development of the national economy. In 2011, the output of flat glass in my country reached 738 million boxes, accounting for about half of the world's output. The flat glass industry is an industry with high energy consumption and high emissions, and is one of the key industrial pollution control industries in...

AI Technical Summary

Problems solved by technology

However, it is difficult to develop a low-temperature denitrification catalyst that can be industrialized in the short term

[0004] For the second type of flue gas treatment technology, the main problem is that the flue gas before entering the denitrification catalyst contains a certain amount of sulfur trioxide, and sulfur trioxide is easy to react with the reducing agent ammonia to form white viscous ammonium bisulfate , making the denitrification catalyst quickly poisoned and deactivated

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