Dust removal and denitration treatment process for tail flue gas of cement kiln

Abstract

The invention relates to a dust removal and denitration treatment process for tail flue gas of a cement kiln, and the process is particularly suitable for tail gas treatment of the cement kiln. The treatment process comprises the following steps that high-temperature flue gas discharged from the tail of a cement kiln firstly enters a preheater to preheat materials, parts of flue gas introduced from the front end of an SP furnace and waste flue gas discharged from a raw material mill are mixed at an air collecting box, and the optimal denitration reaction temperature of 200-240 DEG C can be achieved by adjusting an automatic adjusting valve; the mixed flue gas enters a dust removal and denitration reactor for dust removal and denitration; and the purified flue gas is fed into a chimney under the action of a kiln tail fan. According to the process provided by the invention, a good dust removal and denitration effect is achieved by simplifying the complex process of cooling dust removal and then heating denitration in the prior art.

Description

technical field [0001] The invention relates to a kiln tail gas treatment process, in particular to a treatment method and system for dust removal and denitrification of cement kiln tail gas. Background technique [0002] Cement is an important basic raw material for national economic construction. The main pollutants in cement production are particulate matter and nitrogen oxides. The total emission of nitrogen oxides in the cement industry has been increasing year by year, and it is already the third largest emitter of nitrogen oxides after the thermal power industry and automobile exhaust emissions. At the same time, cement kiln flue gas also includes particulate matter, and according to statistics, its particulate matter emissions account for about 40% of the total particulate matter emissions from industrial sectors in the country. Therefore, it is imperative to carry out comprehensive treatment of denitrification and dust removal for cement kiln flue gas, and to cont...

AI Technical Summary

Problems solved by technology

However, the energy-saving and waste heat utilization of traditional cement production is in place. The waste gas waste heat boiler power generation and raw material mill drying, etc., lead to a very low temperature after dust removal at the kiln tail, about 90-180 °C

In order to adapt to the optimal catalytic reduction reaction temperature of nitrogen oxides, the flue gas needs to be reheated, which undoubtedly makes the process complicated and wastes energy

In addition, the traditional high-dust / semi-dust SCR process scheme at the cement kiln tail is not ideal

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