Process for producing cement clinkers by straws instead of partial fuel coals

Abstract

The invention discloses a cement production process, and in particular relates to a process for producing cement clinkers by straws instead of partial fuel coals, belonging to the technical field of cement production. The straws are input through a predecomposition kiln after mechanically crushed and processed, and the cement clinkers are produced by the straws instead of partial fuel coals; and smoke gas generated by burning the fuel coals and the straws in a mixing mode, a part of which is processed and exhausted through a novel wet-process cement kiln clinker production process route, and the other part of which is exhausted by virtue of cooling and dust removal through air exhaustion of a bypass air exhaustion pipeline arranged on a smoke chamber between the predecomposition kiln and a rotary kiln. By using the process, rich straw resources are fully utilized, so that the straw utilization rate is improved, precious coal resources are reduced, and an adverse effect that a poor cement production system is caused by substances such as potassium sulphate, sodium sulfate and potassium chloride generated by virtue of reaction of chlor-alkali compounds of the straws serving as a part of fuels is overcome.

Description

technical field [0001] The invention relates to a cement production process, in particular to a process for producing cement clinker by replacing part of coal with straw, and belongs to the technical field of cement production. Background technique [0002] Cement is the most widely used inorganic non-metallic material in the construction industry. The production of cement in cement kilns requires a lot of energy. The cement industry mainly uses coal as fuel. Not only that, the coal grinding process also consumes a lot of electric energy. Due to the characteristics of cement production in the new dry process external decomposition kiln, the new dry process external decomposition kiln is also suitable for partially replacing coal to produce cement clinker. [0003] Straw is the stems and leaves left by crops after picking and threshing. It has a wide range of sources and types, including wheat, rice, rape, corn, cotton, etc. The annual output of straw in my country is as hig...

AI Technical Summary

Problems solved by technology

[0004] The biggest difference between the combustion characteristics of straw and coal is that the volatile content in straw is much higher than that of coal, which makes it easy to burn, the average burning speed is fast, and the burnout temperature and burnout time are also lower than coal, but the volatile matter in straw Volatile K 2 O, Na 2 O, Cl - Much higher than the coal sample, these chlor-alkali components are easy to form potassium sulfate, sodium sulfate, potassium chloride and other components in the cement kiln system, some of these components melt into the cement clinker, and the other part volatilizes with the exhaust gas When the exhaust gas flows through the low temperature parts such as the preheater and the flue chamber, it is cooled to form a solid and return to the rotary kiln, and volatilizes into gas again in the rotary kiln, so that chlor-alkali is formed between the cement rotary kiln and the preheater. The internal circulation of the compound, when its concentration reaches a certain level, it will melt on the surface of the raw meal, and form crust blockage in the preheater and rotary kiln, affecting cement production