Tertiary air duct coal powder preheating and prefiring method for cement predecomposition kiln

A technology of precalcining kiln and secondary air, which is applied in the field of pulverized coal preheating and precombustion in the tertiary air duct of cement precalcining kiln, which can solve the problems of large fuel quality limitations, prolonging the residence time of airflow, and poor effects
CN1256293CInactive Publication Date: 2006-05-17周立秋
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
周立秋
Publication Date
2006-05-17
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a method for preheating and pre-combusting pulverized coal in the tertiary air duct of a cement precalcining kiln. A decomposition furnace is set between the rotary kiln and the suspension preheater as the second heat source of the system. A certain proportion of pulverized coal is sprayed into the wall of the tertiary air duct at a certain distance, so that the pulverized coal and the tertiary hot air enter the calciner together. Generally, pulverized coal is sprayed 5-10m away from the tertiary air inlet of the calciner. The pulverized coal sprayed into the tertiary air duct from the wall of the tertiary air duct is divided into two to four symmetrical injections. The ratio of the pulverized coal entering the tertiary air pipe to the pulverized coal directly entering the calciner is 2:8-3:7. The gas-solid ratio of pulverized coal entering the tertiary air duct is subject to the tertiary air temperature of the calciner reaching 950°C-1000°C. Generally, the first branch pipe is led from the pulverized coal air pipe to the calciner to the third air pipe.
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Description

technical field

[0001] The invention relates to a method for preheating and pre-burning pulverized coal in the tertiary air duct of a cement precalcining kiln, which belongs to the technical field of new dry method cement clinker firing, and is mainly used to solve the problem that the pulverized coal combustion speed in the current calciner is relatively slow and prone to The problem of crust clogging and high requirements on coal quality. Background technique

[0002] The precalciner is currently the most advanced process equipment for cement clinker production. A precalciner is added between the rotary kiln and the suspension preheater as the second heat source of the system, so that all the fuel is added from the kiln head in the past. Part of the fuel is added from the kiln head, and part of the fuel is added from the calciner, which improves the heat distribution in the kiln system and moves the most heat-consuming carbonate decomposition process in the clinker calcina...

Claims

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