Full-load flue gas denitration process and apparatus using supplemental combustion for industrial boiler

Abstract

The invention relates to a full-load flue gas denitration process and apparatus using supplemental combustion for an industrial boiler. The apparatus comprises a boiler, a high-temperature heat exchanger, a low-temperature heat exchanger, a small combustor, a catalyst, an air preheater, a chimney, etc. The apparatus is characterized in that the small combustor is additionally arranged on a flue located between the low-temperature heat exchanger arranged at the tail flue of the boiler and the catalyst; the small combustor may use light diesel fuel, coal dust, natural gas or the like as a fuel and is added during low-load operation of the boiler; and a catalyst inlet gas temperature is directly increased by using a supplemental combustion manner, so requirements on the operating temperature of the catalyst are met, and full-load denitration of the industrial boiler is realized. The full-load flue gas denitration process and apparatus provided by the invention are safe, simple, practical and reliable, can greatly reduce environmental protection cost and have high promotion value.

Description

technical field [0001] The invention belongs to the field of flue gas denitrification, and in particular relates to a full-load flue gas denitrification process and device using supplementary combustion for industrial boilers. Background technique [0002] Nitrogen oxides, as one of the main air pollutants, have received more and more attention, and are the key targets of national pollution control. In the field of boiler flue gas denitrification, its working principle is that at a temperature of The nitrogen oxides in the gas and the reducing agent ammonia injected into the upstream flue undergo a reduction reaction under the action of the catalyst to produce nitrogen and water to achieve the removal of nitrogen oxides. However, in the low-load stage of the boiler, the flue gas temperature at the installation position of the catalyst in the flue is low, which cannot meet the working temperature requirements of the catalyst, resulting in poor denitrification effect, unable t...

AI Technical Summary

Problems solved by technology

However, in the low-load stage of the boiler, the flue gas temperature at the installation position of the catalyst in the flue is low, which cannot meet the working temperature requirements of the catalyst, resulting in poor denitrification effect, unable to meet the emission standards, and long-term operation may also cause catalyst failure. , air preheater blockage and other major safety hazards

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