Energy saving and emission reduction transformation method for transforming cement cyclone preheater kiln into outside-kiln precalcining kiln

Abstract

The invention discloses an energy saving and emission reduction transformation method for transforming a cement cyclone preheater kiln into an outside-kiln precalcining kiln. A tertiary air duct (07), an offline calcining combustor (08), a calcining combustor burner (09), a five-stage preheater (10), a fresh air high-temperature fan (11), a normal temperature gas analyzer (12), a tertiary air gate valve (13) and a high temperature gas analyzer are newly built on the basis of an original cyclone preheater rotary kiln line, wherein a new preheater system and an old preheater system serve cement production jointly. The original kiln shutdown duration of eight months is shortened to 2-3 months, the cost of detaching of an old preheater is reduced, raw materials of the old preheater are wholly conveyed into the offline calcining combustor, the in-kiln calcining rate of the raw materials is increased to 90% or over from original 100% of in-kiln calcining through the offline calcining combustor, and the raw materials of the new preheater enter the kiln through an original feed-end chamber. After the cyclone preheater kiln is transformed into the precalcining kiln, 100% of fuel of a kiln head is reduced to 40%, the amount of NOx generated by the kiln head at a high temperature environment is reduced, and the method can quickly change the cement production process and achieve the yield increase, energy saving and emission reduction effects for a cement sintering system.

Description

technical field [0001] The invention relates to the fields of cement kiln technical transformation, energy saving and emission reduction, in particular to a method for transforming a cement cyclone preheater kiln into an out-of-kiln precalciner kiln for increasing output, energy saving and emission reduction. Background technique [0002] At present, the mainstream process of cement production is the new dry process cement kiln pre-decomposition production process. This process is upgraded from the cyclone preheater kiln process. It still exists in regions such as Russia, Central Asia, and Africa in the world. A certain number of cement cyclone preheater kilns, the heat consumption, power consumption and NOx emission of this type of kiln are much higher than the new dry process cement precalciner kiln; after the development of the international cement market, the cement preheater kiln will eventually Gradually withdraw from the historical stage, but limited to the requiremen...

AI Technical Summary

Problems solved by technology

The old and new preheater systems serve cement production together

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