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Oxygen-enriched combustion process for improving cement kiln clinker calcining temperature and apparatus thereof

A technology of oxygen-enriched combustion and clinker calcination, which is applied in the field of oxygen-enriched combustion technology and its device to increase the calcination temperature of cement kiln clinker, which can solve the problems of affecting the quality of cement clinker and unstable temperature, so as to save coal consumption and reduce Labor cost, to ensure the effect of visualization

Inactive Publication Date: 2009-04-15
昆明阳光基业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is: the oxygen-enriched combustion technology is applied to the cement kiln combustion system, that is, the oxygen-enriched combustion technology is applied to the kiln head and kiln tail combustion system of the cement kiln, which solves the requirements of the cement kiln combustion system for coal quality and the cement kiln combustion. The unstable temperature of the system affects the quality of cement clinker and the life of cement kiln equipment

Method used

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  • Oxygen-enriched combustion process for improving cement kiln clinker calcining temperature and apparatus thereof
  • Oxygen-enriched combustion process for improving cement kiln clinker calcining temperature and apparatus thereof
  • Oxygen-enriched combustion process for improving cement kiln clinker calcining temperature and apparatus thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Application of 2000t / d new dry process kiln combustion system:

[0037] Project introduction: This project was put into production test in 2005. By the end of 2006, the calorific value of the coal used was basically guaranteed to be above 20090KJ / KG, and the feed rate is generally above 175t / h, and the production is relatively normal. In 2007, due to the increase in the supply gap of high-quality coal, the calorific value of the coal used was basically around 17,200KJ / KG, resulting in the average temperature of the kiln head cover around 1000℃ (design value 1350℃) and the average secondary air temperature around 850℃ (design value) Above 950℃), the average temperature of the three winds is about 650℃ (design value is greater than 800℃), and the average feed rate is about 140t / h (design value 175t / h). The actual output is seriously insufficient, and the life of each equipment cannot meet the design requirements. The cost has increased significantly. The adjustment of the ope...

Embodiment 2

[0047] The nozzle installation method is as follows:

[0048] 1. Kiln head: remove the fuel injection nozzle of the original coal injection nozzle system of the kiln head, and install a special oxygen delivery high temperature nozzle for the rotating flow channel, such as Figure 4 .

[0049] 2. Kiln tail: transform the original two-channel coal injection nozzle into a three-channel coal injection nozzle, and the middle channel conveys oxygen-enriched combustion air, such as Figure 7 .

[0050] The rest is the same as in Example 1.

Embodiment 3

[0052] The nozzle installation method is as follows:

[0053] 1. Kiln head: transform the original five-channel coal injection nozzle into a six-channel coal injection nozzle, and the middle channel transports industrial oxygen, such as Figure 5 .

[0054] 2. Kiln tail: install a high temperature nozzle with rotating flow channel at the place where the tertiary air pipe is connected to the shell of the calciner Figure 8 .

[0055] The rest is the same as in Example 1.

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Abstract

The invention relates to an oxygen-enriched combustion technical method for improving heating power of a cement kiln and a device thereof. During the process of cement clinker calcination, the invention is characterized in that: 1) a pure oxygen (over 90 percent) feeding device is added at a coal dust combustion zone of the cement kiln so as to lead the combustion zone to form a local thermonuclear area, and with the gradual diffusion of high temperature at the thermonuclear area, the heating power of the whole cement kiln is further improved and stably controlled; and 2) an oxygen feeding device is added at a combustion area of the cement kiln so as to improve and stably control the oxygen content in combustion air within the range of 21.8-33 percent at the combustion area. In a coal supplying system and an air supplying system of the cement kiln, an oxygen-enriched combustion system is formed by arranging at least one high temperature resistance oxygen jet, a pipeline for transmitting oxygen, an oxygen generation device, an oxygen supply-quantity regulating device, a DCS control device and the like inside each independent combustion area of the cement kiln. The invention has the advantages of improving combustion efficiency of faulty coal and the heating power of the cement kiln, and stabilizing thermal regulation of the kiln so as to enhance the quality of the cement and prolong the service life of various heating equipment of the cement kiln.

Description

Technical field [0001] The invention relates to a process method and a device for applying oxygen-enriched combustion technology to a cement kiln firing system. technical background [0002] my country's cement output has ranked first in the world. In 2007, my country's cement output reached 1.354 billion tons, accounting for about 50% of global output, and new dry-process cement accounted for 53% of total cement output. New dry-process cement kilns have higher requirements for coal quality. Generally, the low-level calorific value of coal is required to be above 20934kj / kg, but my country's high-quality coal reserves are limited. There are fewer high-quality coal reserves in southern my country. Most of the coal has a low calorific value below 20934kj / kg. Increasing the excess air can not make it fully burned. On the contrary, it reduces the combustion temperature and fails to meet the requirements for calcination of cement clinker. By adopting oxyfuel combustion technology, low...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/44
CPCC04B7/4476
Inventor 李波文张自意李明杨振立
Owner 昆明阳光基业股份有限公司
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