Coal dust combustion improver for cement kiln

A combustion aid and cement kiln technology, applied in the field of building materials, can solve the problems of reducing the quality of clinker, equipment erosion, and crusting of the pre-decomposition system, and achieve the effects of increasing manganese ore content, promoting concentrated combustion, and good combustion-supporting effect

Inactive Publication Date: 2010-04-07
洛阳大泽节能环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These additives are generally fluorides, sulfides (or sulfates) or their complexes. The principle is to reduce the formation of liquid phase and clinker firing temperature, and promote the formation of cement clinker minerals, but it will c

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The composition (percentage by weight) of the pulverized coal combustion aid for cement kiln is: manganese ore 70%, chemical activator 20% (composed of potassium nitrate 40%, potassium carbonate 40%, sodium silicate 20%), clinker combustion aid 10% (from CuO 65%, Cr 2 o 3 25%, lanthanide rare earth LaO 2 10% composition). According to this, according to the addition of 0.06% into the pulverized coal, the clinker can be fired with low-quality coal with a calorific value of 19000-20000kJ / kg, the heat consumption of the clinker can be reduced, the coal can be saved by 15%, and the clinker can be used for 28 days. The compressive strength is increased by 4MPa.

Embodiment 2

[0031] The composition (percentage by weight) of the pulverized coal combustion aid for cement kiln is: 50% manganese ore, 40% chemical activator (composed of 60% potassium nitrate, 35% potassium carbonate, and 5% sodium silicate), clinker combustion aid 10% (from CuO 65%, Cr 2 o 3 25%, lanthanide rare earth LaO 2 10% composition). According to this, according to the addition of 0.04% into the coal powder, the clinker can be fired with low-quality coal with a calorific value of 19000-20000kJ / kg, the heat consumption of the clinker can be reduced, the coal can be saved by 12%, and the clinker can be used for 28 days. The compressive strength is increased by 3MPa.

Embodiment 3

[0033] The composition (percentage by weight) of the pulverized coal combustion aid for cement kiln is: manganese ore 60%, chemical activator 30% (composed of potassium nitrate 55%, potassium carbonate 40%, sodium silicate 5%), clinker combustion aid 10% (from CuO 65%, Cr 2 o 3 25%, lanthanide rare earth LaO 2 10% composition). According to this, according to the addition of 0.05% into coal powder, the clinker can be fired with low-quality coal with a calorific value of 19,000-20,000 kJ / kg, the heat consumption of clinker firing can be reduced, the coal can be saved by 14%, and the clinker can be used for 28 days. The compressive strength is increased by 3MPa.

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PUM

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Abstract

The invention discloses coal dust combustion improver for cement kilns, which comprises the following components by weight percentage: 50-80% of manganese ore, 10-40% of chemical activator, 5%-15% of clinker sintering agent, and less than 2% of moisture content. The coal dust combustion improver for cement kilns of the invention has the effects of promoting concentrated combustion of coal powder and improving the strength of clinks, and the combustion-supporting mechanism of the coal dust combustion improver is as follows: by combustion-supporting components, the fire point of coal powder is decreased, the melting point of coal powder ash is increased, and combustion atmosphere is regulated at high temperature, thereby achieving the purpose of utilizing fault coal fully in the process of cement burning and the purposes of promoting the sintering reaction of clinkers and improving the strength of clinkers by adding combustion improver components of cement clinkers.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to a pulverized coal combustion accelerant for cement kilns. Background technique [0002] As the main building material, cement concrete occupies an important position in the national economy. my country's cement output has ranked first in the world for more than ten consecutive years. In the past five years, the annual cement output has grown at an average annual rate of 15%. In 2008, the total cement output reached 1.388 billion tons, accounting for 55% of the world's total cement output. Cement production consumes a lot of resources and energy, and fuel costs account for more than 60% of cement production costs. In 2008, my country's cement clinker calcined coal used reached 186 million tons, accounting for 6.7% of the country's coal production. Reducing energy consumption and reducing environmental load, so that the cement industry enters the development stage of en...

Claims

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Application Information

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IPC IPC(8): C10L9/10C04B7/42
Inventor 王玉江吴育谦张亚南
Owner 洛阳大泽节能环保科技有限公司
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