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Novel process for preparing pulverized coal for enhancing production efficiency and quality of cement by dry method

A dry-process cement and production efficiency technology, applied in cement production, clinker production, etc., can solve the problems of rising clinker heat consumption, snowman, waste gas temperature and waste gas volume increase, etc., to improve efficiency and quality, reduce process Accidents, the effect of improving the operation rate

Inactive Publication Date: 2008-12-31
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under normal circumstances, if the flame temperature is reduced by 10°C, the output of the rotary kiln will decrease by about 1%; the increase in ash content in coal powder will also lead to an increase in the temperature and amount of exhaust gas, and an increase in the heat consumption of clinker; when burning coal with high ash content, the combustion The final ash will fall on the clinker in the firing zone, forming an ash layer, and the kiln system is more likely to form rings and skins, and it is prone to the problem of grate coolers making snowmen

Method used

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  • Novel process for preparing pulverized coal for enhancing production efficiency and quality of cement by dry method
  • Novel process for preparing pulverized coal for enhancing production efficiency and quality of cement by dry method
  • Novel process for preparing pulverized coal for enhancing production efficiency and quality of cement by dry method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The coal powder prepared by Nanjing Sanlong Cement Co., Ltd. with a ball mill and a vertical mill was sieved with a 60 μm sieve, and the results shown in Table 1 were obtained.

[0013] Table 1 Separation effect of sieving on coal powder

[0014]

[0015] It can be seen from Table 1 that the coal powder of Sanlong Cement Plant is screened with a 60 μm sieve, the ash content of the coarse coal powder is reduced by 6-8%, and the volatile content is also increased by 2-3%. This coal powder is used in the rotary kiln The kiln head will inevitably bring good results; while the fine coal powder has high ash content and fine particles, which will not have obvious adverse effects on the calciner.

Embodiment 2

[0017] The coal powder prepared by Shandong Shanshui Group (Zaozhuang) Cement Co., Ltd. with a ball mill was sieved according to 50 μm, and the results shown in Table 2 were obtained.

[0018] Table 2 Separation effect of sieving on coal powder

[0019]

[0020] It can be seen from Table 2 that for coal powder with low raw coal ash content, this method can also separate two types of coal powder with different ash content, and the coarse particle part has lower ash content and higher volatile content, which helps to reduce heat consumption and Improve the quality of clinker production.

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Abstract

The invention discloses a coal powder preparation method which can improve the dry cement production efficiency and quality, relating to the cement production technical field. The technical proposal is that the coal powders milled by raw coal are graded based on particle sizes so as to get the coal powders with different ash contents; the smaller granular coal powders are combusted in a calciner, while the larger granular coal powders are combusted in a head kiln of a rotary kiln. The method disclosed in the invention has the advantages of reducing energy consumption in novel dry cement production, improving the quality of clinker, reducing the frequent technologic accidents and increasing the operation rate.

Description

technical field [0001] The invention relates to the technical field of cement production. Specifically, it is a coal powder preparation method for improving the production efficiency and quality of new dry process cement. Background technique [0002] my country's cement production accounts for about 50% of the world's cement production. It is the development trend of the cement industry to produce cement by new dry process. With the increasing shortage of coal resources, cement plants are forced to use coal with higher and higher ash content. The use of coal with high ash content will often result in an increase in clinker heat consumption and a decrease in product quality, as well as frequent occurrence of process accidents and affect the operating rate of the rotary kiln. [0003] According to the production practice of cement plants, the increase of ash content in pulverized coal will reduce the flame temperature and flame radiation ability. Under normal circumstances...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/43
CPCY02P40/121
Inventor 张洪
Owner CHINA UNIV OF MINING & TECH