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Fuel for firing into rotary kiln cement clinker

A technology for cement clinker and rotary kiln, which is applied to fuels, solid fuels, biofuels, etc., can solve the problems of small actual substitution, large mixing amount, poor coal type selectivity, etc., to promote output and quality, and wide selection , the effect of reducing the firing temperature

Inactive Publication Date: 2008-07-09
吴飞龙
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still many defects in this type of method. First, because the coal contains other substances such as sulfur, and the content of low-quality smoke and anthracite with low activity is higher, the harmful waste gas such as sulfur dioxide produced in the combustion process after replacing high-quality bituminous coal is greater, which is bound to It brings more serious damage to the atmospheric environment; second, with the introduction of high ash content, there are more negative impact factors on the firing quality of cement clinker, especially for the firing quality of special cement clinker. The other negative effects of the ash brought in are far greater than the positive benefits, and even lead to the waste of cement clinker; third, the current commercially available coal-burning combustion aids are generally high in price, large in dosage, poor in selectivity to coal types, and seriously Na that affects the clinker firing conditions of the rotary kiln and the final product quality of cement + 、K + , Cl - , Mg 2+ High content of harmful elements such as
The second type is to use urban domestic garbage, waste rubber, and waste plastics to replace part of the coal as the fuel for the cement clinker of the rotary kiln. The kiln production process equipment undergoes special transformation and the investment is large, and the actual replacement amount is small. At the same time, the harmful components in the exhaust gas emitted during the production process increase, and the heavy metals contained in the burnt ash cannot be completely solidified in the clinker minerals. , free heavy metals will still cause secondary pollution to the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: A fuel used for burning cement clinker in a rotary kiln. The raw materials are peanut shells, sawdust from the bamboo and wood processing industry, pressed tea seed oil cake, and anthracite. The industrial analysis results of each raw material are shown in Table-1 , by weight percentage: peanut shell 35%, sawdust 41%, tea seed oil cake 13%, anthracite 11% to prepare the fuel for the cement clinker of the rotary kiln, and its preparation method is: the peanut shell that cools and dries in advance 1. Pulverize the tea seed oil cake into 40-50 mesh powder, dry the sawdust until the water content is less than 3.0%, grind the anthracite until the residue on the 80um square hole sieve is less than 15%, and mix evenly. Table-2 is the technical and economic indicators of the rotary kiln system when the cement clinker of the rotary kiln is fired with two different fuels, high-quality bituminous coal and the fuel of the present invention, under the same other technologi...

Embodiment 2

[0020] Example 2: A kind of fuel used for burning cement clinker in a rotary kiln. Cotton stalks in straw materials, bamboo joints and anthracite from scraps in the bamboo and wood processing industry are selected as raw materials, and the raw materials are based on industrial analysis results. See Table-1, by weight percentage: cotton stalk 20%, bamboo knot 65%, anthracite 15% to prepare the fuel for rotary kiln cement clinker burning, and its preparation method is: pre-cool cotton stalk, bamboo knot Dry in the sun until the moisture content is less than 3.0%, then pulverize them into 30-50 mesh powders with a pulverizer, and grind the anthracite until the 80um sieve residue is less than 15%, then mix evenly. The implementation effect is detailed in Table-2.

Embodiment 3

[0021] Embodiment 3: A kind of fuel that is used for cement clinker burning of rotary kiln, selects shrubs and miscellaneous trees among forest products, rice bran and coke that are the by-products of grain processing industry as composition raw materials and prepares for cement clinker burning of rotary kiln For fuel, the industrial analysis results of each raw material are shown in Table-1. After drying the small shrubs and miscellaneous trees in the sun and crushing them into 30-50 mesh powders, and grinding the coke powder until the sieve residue of 80um is less than 10%, press the shrub miscellaneous 30% of tree powder, 60% of rice bran, and 10% of coke are metered by metering pumps, and sprayed into the rotary kiln through multi-channel conveying pipeline burners at the same time as fuel for white cement clinker firing. Table-3 is a comparison table of the technical and economic effects of burning white cement clinker with high-quality bituminous coal and the fuel prepare...

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PUM

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Abstract

A fuel which is used for rotary kiln cement clinker firing is composed of raw materials with the following weight percentage: coal 3-80, straw substances 0-90, forest products wastes 0-95 and food industry by-product residues 0-70. The straw substances refer to rice straws, wheat straws, cotton stalks, sesame stalks, soybean straws, corn stalks, sorghum stalks, rice husks, peanut shells, soybean shells and corn sticks, the forest products wastes refer to defective bamboo, wood, tree branches, leaves, shrubs, faggot straws and sawdust and wood wool corner scrap materials in the bamboo and wood-processing industry, the food industry by-product residues refer to bran, wheat skin, squeezing meal cake, bean dregs and wine lees, and the coal refers to bituminite, anthracite and coke coal powder. The flue raw materials which are used for the rotary kiln cement clinker firing have wide selecting range, simple preparation, convenient use and rapid burning speed and are beneficial for protecting atmosphere circumstances.

Description

technical field [0001] The invention belongs to the fuel used in the cement industry, in particular to the fuel used for burning cement clinker in a rotary kiln. Background technique [0002] In terms of fuels used in the firing of cement clinker in rotary kilns, high-volatility (≥25%), low-ash (≤20.0%) high-quality smoke heavy metals or heavy oils have long been used as fuels. However, with the global With the increasingly tight energy supply, the traditional way of burning cement clinker with high-quality bituminous coal or heavy oil has seriously restricted the social and economic benefits and development speed of cement enterprises. In this regard, domestic and foreign scientific research institutions and professionals have done a lot of work. Although they have obtained numerous scientific research results and patented technologies, their main technologies and methods are summarized as follows: It is made in a very fine way to increase the burning speed of low-volatili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L5/04C10L5/44C04B7/43
CPCY02E50/30Y02E50/10
Inventor 吴飞龙
Owner 吴飞龙
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