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Production method of cement clinker by calcination with oxygen-rich reinforced lignite

A cement clinker and production method technology, applied in clinker production, cement production, etc., can solve the problems of low flame temperature, low ignition point of lignite, insufficient combustion, etc., and achieve the effects of reducing system heat consumption and increasing flame temperature

Active Publication Date: 2014-01-08
INNER MONGOLIA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problems of insufficient combustion, low flame temperature and high pollutant emission concentration caused by the performance defects of lignite such as low ignition point, high moisture, high volatile content, and high ash content, so as to make its ignition point and calorific value meet the requirements of calcined cement clinker, The invention proposes to use oxygen-enriched conditions to accelerate the combustion rate of pulverized coal per unit time and strengthen the combustion performance of lignite so that the calorific value of lignite per unit time can meet the technical requirements of calcining cement clinker, and the oxygen-enriched combustion technology is applied to lignite combustion. It breaks through the limitation that lignite cannot be used alone as fuel in traditional cement clinker production, and low-quality coal cannot be fully utilized

Method used

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  • Production method of cement clinker by calcination with oxygen-rich reinforced lignite
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  • Production method of cement clinker by calcination with oxygen-rich reinforced lignite

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Experimental program
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Effect test

Embodiment 1

[0029] 1. First, the raw coal is crushed, hot-air dried, coal milled, and hot-air dried to make coal powder with a fineness of less than 80 μm. The sieve rate of 200-mesh square hole sieve is less than 10%, and the moisture content is controlled at 10%— Between 15%;

[0030] 2. Send the pulverized coal ground in step 1 into the pulverized coal bin, and send the pulverized coal into the rotary kiln and the calciner for combustion through the Roots blower respectively;

[0031] 3. Mix industrial pure oxygen and air evenly in the gas mixing chamber to obtain oxygen-enriched gas, and the oxygen concentration in the oxygen-enriched gas reaches 36%. The oxygen-enriched gas enters the grate cooler through the blower to exchange heat, and the oxygen-enriched gas after heat exchange enters the rotary kiln and the calciner respectively as secondary air and tertiary air;

[0032] 4. The present invention uses a four-channel burner as the combustion equipment. The wind blown from the in...

Embodiment 2

[0037] 1. First, the raw coal is crushed, hot-air dried, coal milled, and hot-air dried to make coal powder with a fineness of less than 80 μm. The sieve rate of 200-mesh square hole sieve is less than 10%, and the moisture content is controlled at 10%— Between 15%;

[0038] 2. Send the pulverized coal ground in step 1 into the pulverized coal bin, and send the pulverized coal into the rotary kiln and the calciner for combustion through the Roots blower respectively;

[0039]3. Mix industrial pure oxygen and air evenly in the gas mixing chamber to obtain oxygen-enriched gas, and the oxygen concentration in the oxygen-enriched gas reaches 40%. The oxygen-enriched gas enters the grate cooler through the blower to exchange heat, and the oxygen-enriched gas after heat exchange enters the rotary kiln and the calciner respectively as secondary air and tertiary air;

[0040] 4. The present invention uses a four-channel burner as the combustion equipment. The wind blown from the ins...

Embodiment 3

[0045] 1. First, the raw coal is crushed, hot-air dried, coal milled, and hot-air dried to make coal powder with a fineness of less than 80 μm. The sieve rate of 200-mesh square hole sieve is less than 10%, and the moisture content is controlled at 10%— Between 15%;

[0046] 2. Send the pulverized coal ground in step 1 into the pulverized coal bin, and send the pulverized coal into the rotary kiln and the calciner for combustion through the Roots blower respectively;

[0047] 3. Mix industrial pure oxygen and air evenly in the gas mixing chamber to obtain oxygen-enriched gas, and the oxygen concentration in the oxygen-enriched gas reaches 50%. The oxygen-enriched gas enters the grate cooler through the blower to exchange heat, and the oxygen-enriched gas after heat exchange enters the rotary kiln and the calciner respectively as secondary air and tertiary air;

[0048] 4. The present invention uses a four-channel burner as the combustion equipment. The wind blown from the in...

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Abstract

The invention provides a production method of cement clinker by calcination with the combustion performance of oxygen-rich reinforced lignite. A combustor with four wind channels is adopted, wherein coal wind, cyclone wind and axial-flow wind serve as primary wind, the primary wind is air and the volume of the primary wind accounts for 8% total wind volume; center wind is also air and the volume of the center wind accounts for lower than 1% total wind volume; secondary wind and tertiary wind are oxygen-rich gas with oxygen concentration of 25-90%, and the temperature of a kiln head is controlled between 980 DEG C and 1020 DEG C when the secondary wind enters the kiln head. The combustion performance of the oxygen-rich reinforced lignite is applied to the calcinations of cement clinker, the limitation that at present lignite can not be used alone as a fuel during production of cement clinker is broken, and the production method has significant economical and social benefits.

Description

technical field [0001] The invention relates to a production method of cement clinker, in particular to a production method of applying oxygen-enriched combustion technology to solely utilize lignite to calcinate cement clinker. technical background [0002] Lignite is a flammable fossil fuel. The geological reserves of lignite in the world are about 4 trillion tons, accounting for about 40% of the global coal reserves. According to the third national survey of coal resources, the total coal resources in my country are 5.57 trillion tons, and the reserves are 1003.26 billion tons. The proven lignite reserves are 131.142 billion tons, accounting for about 13% of the coal reserves. The reserves of lignite in the region account for about 75% of the country. Lignite is mainly used for power generation because of its shallow carbonization degree, high moisture content, high ash content, and low calorific value, which limit its wide application. Facing the increasingly tight dome...

Claims

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Application Information

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IPC IPC(8): C04B7/44
CPCY02P40/121
Inventor 张永锋李春萍陈香云周全刘占英
Owner INNER MONGOLIA UNIV OF TECH
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