CN103214199A - Method for calcining novel dry-method cement clinker by brown coal - Google Patents
Method for calcining novel dry-method cement clinker by brown coal Download PDFInfo
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- CN103214199A CN103214199A CN2012105428628A CN201210542862A CN103214199A CN 103214199 A CN103214199 A CN 103214199A CN 2012105428628 A CN2012105428628 A CN 2012105428628A CN 201210542862 A CN201210542862 A CN 201210542862A CN 103214199 A CN103214199 A CN 103214199A
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Abstract
The invention discloses a method for calcining novel dry-method cement clinker by brown coal, wherein the method comprises that the brown coal is sent to a decomposing furnace as a calcining fuel after crushed and homogenized. Based on characteristics of short combustion time of the decomposing furnace and long combustion time of a rotary kiln, the method of the invention uses brown coal to replace common novel dry-method soft coal as a fuel of the decomposing furnace, and the rotary kiln still uses soft coal or/and anthracite with characteristics of high heating value and long combustion time, wherein the brown coal has characteristics of low heating value, low price, fast flaming speed and short combustion time, and the soft coal has characteristics of high price and long combustion time. The method enables fuel characteristics to accord with different combustion characteristic requirements of the decomposing furnace and the rotary kiln, is in favor of raising a burn-off rate of coal dust and raising a decomposition speed of calcium carbonate, reducing buildups jam of a preheater system, enables a utilization rate of brown coal for producing novel dry-method cement to reach more than 60%, fully utilizes a local coal resource, raises an energy utilization rate, and further reduce a production cost of cement.
Description
Technical field
The invention belongs to the technology of producing cement field, relate to a kind of method of utilizing brown coal calcining new type nonaqueous cement grog, particularly relate to a kind of method of utilizing brown coal calcining new type nonaqueous cement grog.
Background technology
New type nonaqueous cement technology is meant and adopts the outer using predecomposition technology production Cement Production method of kiln that it is produced with suspended preheater and precal cination technique is core.The appearance of using predecomposition technology is a technology leap of cement calcinating process, be between preheater and rotary kiln, to set up decomposing furnace and utilize kiln tail funnel uptake, if fuel jetting device, make the endothermic process of the carbonate decomposition of the exothermic process of fuel combustion and raw material, in decomposing furnace,, the rate of decomposition of kiln raw material is brought up to more than 90% to carry out rapidly under suspended state or the fluidized.Carbonate decomposition task with originally carrying out in rotary kiln moves on in the decomposing furnace and carries out; The fuel major part adds in decomposing furnace, and small part is added by kiln hood, has alleviated the thermal load of calcining zone in the kiln, has prolonged the wadding life-span, helps producing maximizing; Because fuel and raw material mix, fuel combustion heat in time passes to material, and burning, heat exchange and carbonate decomposition process are optimized, thus have new dry process, efficiently, a series of premium propertiess and characteristics such as low consumption.
Coal is the topmost energy of New Type Dry-process Cement Production, has the effect of fuel and raw material therein concurrently, is divided into two portions in the use of firing system coal, and a part is decomposing furnace coal, about 60% of the total coal consumption of the system that accounts for; A part is rotary kiln coal, about 40% of the total coal consumption of the system that accounts for.It is flameless combustion that the combustioncharacteristics of decomposing furnace requires, these three processes of thermal endothermic decomposition of fuel combustion heat release, suspended state heat transfer and material are closely linked and carry out, the speed of burning heat release and the speed that material divides heat of desorption adapt, require the combustionvelocity of coal to want fast, the time of burning will lack, and it is high that burn-out degree is wanted; The combustioncharacteristics of rotary kiln is flaming combustion, and higher temperature of combustion, the moderate length of flame, combustionvelocity want fast, and the time of burning will be grown, and burn-out degree requires high, and is to the having relatively high expectations of coal, the most suitable with bituminous coal in view of the above.But manufacture of cement is the industry of a highly energy-consuming, minimizing along with coal resources, the energy-intensive aggravation, the new dry process coal resources are fewer and feweri, price is more and more higher, seriously restricting New Type Dry-process Cement Production, energy cost has accounted for about 60% of New Type Dry-process Cement Production cost according to statistics, has become the main composition part of manufacture of cement cost.
The employed coal of New Type Dry-process Cement Production mainly contains several coals such as brown coal, bituminous coal, hard coal, semi-anthracitic coal.Brown coal contain fugitive constituent about 40%, and burning-point is low, catch fire easily, and quick combustion during burning, flame is big, and carbon content and thermal value are lower, and combustion time is short.Bituminous coal contains fugitive constituent more than 20%, and burning-point is not too high, more easily lights, and carbon content and thermal value are higher, quick combustion during burning, and flame is long, and combustion time is longer.The hard coal volatile content is low, and below 10%, the burning-point height is difficult for catching fire, but the thermal value height, it is slow to get angry during burning just, and bigger after fire comes up, firepower is strong, and flame is short, and combustion time is long, a little less than the cohesiveness, be difficult for slagging scorification during burning, should mix an amount of coal soil and burn usefulness, to alleviate intensity of fire.
It is the ubiquitous phenomenon of current new type dry kiln that skinning stops up, and has influenced the ordinary production of cement, and a major reason of its generation is that coal burning characteristic and decomposing furnace do not match.In decomposing furnace, coal dust firing speed generally all is lower than carbonate decomposition speed, and coal dust firing heating speed has determined carbonate speed; In addition, coal burning speed has determined the time that coal dust firing complete (burning) needs, if coal dust can not burn in decomposing furnace, take the heating of preheater pipeline relaying afterflame burning to and cause localized hyperthermia, stick to after the raw material fusion and just produce the skinning obstruction on the pipeline.In addition, the fuel that China's burning clinker of cement generally uses mainly be high heating value (〉=5500kcal/kg), the new dry process bituminous coal of high-volatile (〉=25%) is main, have mix an amount of brown coal or hard coal mixes the back simultaneously as decomposing furnace and rotary kiln coal.But it is very inhomogeneous that the area of coal in China reserves distributes, a large amount of new dry process coal concentrates on North China, northwest and Central-South some areas, and as the Yunnan brown coal account for the coal proven reserve 75%, the Guangdong brown coal account for 45%, all adopting bituminous coal both to be unfavorable for comprehensive, the effectively utilization of brown coal, is again to cause the high major cause of local cement production enterprise production cost.At present, seldom have in the New Type Dry-process Cement Production separately or vast scale uses brown coal as decomposing furnace fuel, adopt brown coal to pass through burner combustion as Chinese invention patent CN101759382A, flame after the burning enters decomposing furnace and rotary kiln respectively, has complex process, the unmanageable shortcoming of burning quality.
Because the decomposing furnace of New Type Dry-process Cement Production is different fully to demanded fuel with rotary kiln, if a kind of production method that meets new type nonaqueous cement decomposing furnace and rotary kiln combustion requirements can be provided, can solve the skinning blockage problem; If can also adopt low heat value coal at the more decomposing furnace of coal consumption, particularly utilize wider respectively brown coal, can make full use of local lignite resource, help improving the utilization ratio of local coal resources, and can also reduce the manufacture of cement cost.
Summary of the invention
The object of the present invention is to provide and a kind ofly can effectively reduce the low method of utilizing brown coal calcining new type nonaqueous cement grog of the obstruction of decomposing furnace skinning, coal resources utilization ratio height, production cost.
The present invention is that the use at firing system coal comprises decomposing furnace with coal and rotary kiln coal, also sends into decomposing furnace as calcinating fuel after the homogenizing with brown coal are broken.
The present invention is according to the characteristics of New Type Dry-process Cement Production nucleus equipment: decomposing furnace combustion time is short, temperature is low, and rotary kiln combustion time is long, temperature is high.The employing thermal value is relatively low, cheapness but quick combustion, combustion time, short brown coal replaced conventional new dry process high price, combustion time is long, the high bituminous coal of thermal value is as decomposing furnace fuel, and rotary kiln still adopts the heat height, bituminous coal or hard coal that combustion time is long, can make fuel combustion characteristics meet the combustion requirements of decomposing furnace and rotary kiln respectively, and brown coal quick combustion, combustion time, short characteristics helped improving the burnout rate of coal dust in the decomposing furnace and the decomposition rate of raising lime carbonate, the skinning that effectively reduces pre-heating system stops up and improves the rate of decomposition of lime carbonate, reach the thermal load that alleviates rotary kiln, improve equipment capacity; The present invention can also make that the brown coal utilization reaches more than 60% in the New Type Dry-process Cement Production process, reaches to make full use of the abundant local coal resources of lignite resource, improves the purpose of the utilization ratio of coal resources, and can also reduce the manufacture of cement cost.
Description of drawings
Fig. 1 is a process flow diagram of the present invention.
Embodiment
The present invention is further illustrated below in conjunction with embodiment, but never in any form the present invention is limited, and any change or improvement based on training centre of the present invention is done all belong to protection scope of the present invention.
The present invention is that the use at firing system coal comprises decomposing furnace with coal and rotary kiln coal, also sends into the calcinating fuel of decomposing furnace as the new type nonaqueous cement grog after the homogenizing with brown coal are broken.
The bituminous coal and/or the hard coal that add its 1～50% weight percent in the described brown coal.
In the described method, in rotary kiln, use bituminous coal and/or hard coal as calcinating fuel.
Described brown coal are made granularity≤5mm through fragmentation.Because the brown coal burning-point is short low, combustion time, for the combustion speed that the makes brown coal decomposition rate with lime carbonate adapts, preferred brown coal are crushed to and just drop into decomposing furnace without grinding behind the certain particle size and act as a fuel, and help reducing the production cost of fuel grinding.
Described grinding is to carry out grinding by the combination of one of vertical pulverizing mill, high pressure overhang roll mill, middling speed micronizer, the trapezoidal mill of superpressure, Raymond mill or any two kinds of equipment.
Described brown coal sulphur content≤1.5%.Lower sulphur content helps preventing the generation of skinning.
Described brown coal are made granularity≤5mm through fragmentation.
Described fragmentation is to carry out fragmentation by the combination of one of impact breaker, ring hammer crusher, flute profile Sizing Crusher, double teeth roller grading machine, double-geared roller crusher or any two kinds of equipment.
Described decomposing furnace is the cyclone type decomposing furnace, the formula of spurting decomposing furnace, floated decomposing furnace, boiling type decomposing furnace or the whirlwind-formula of spurting decomposing furnace
Embodiment 1
Advance the brown coal of factory and bituminous coal separate storage, stacking, homogenizing, brown coal are broken into the particle of 5mm by ring hammer crusher, are stored in the coal bunker, are fed in the decomposing furnace by metering outfit and handling equipment and burn.Bituminous coal is made coal dust by the grinding machine grinding, by metering outfit and the burning of handling equipment feeding rotary kiln coal powder injection pipe.
Embodiment 2
Advance the brown coal of factory and bituminous coal separate storage, stacking, homogenizing, brown coal are broken into the particle of 3mm by impact breaker, are stored in the coal bunker, are fed in the decomposing furnace by metering outfit and handling equipment and burn.Bituminous coal is made coal dust by the grinding machine grinding, by metering outfit and the burning of handling equipment feeding rotary kiln coal powder injection pipe.
Embodiment 3
Advance the brown coal of factory and bituminous coal separate storage, stacking, homogenizing, brown coal grind into fineness 0.08mm square hole sieve by raymond grinding powder and tail over 3% coal dust, are stored in the coal bunker, are fed in the decomposing furnace by metering outfit and handling equipment and burn.Bituminous coal is made coal dust by the grinding machine grinding, by metering outfit and the burning of handling equipment feeding rotary kiln coal powder injection pipe.
Embodiment 4
The brown coal that enter factory store through homogenizing, make fineness 0.08mm square hole sieve by vertical pulverizing mill grinding then and tail over 5% coal dust, with the bituminous coal of making coal dust brown coal by mass percentage: bituminous coal 80%:20% homogenizing also is stored in the coal bunker, is fed in the decomposing furnace by metering outfit and handling equipment and burns.Bituminous coal is made homogenizing behind the coal dust, storage by the grinding machine grinding, then by metering outfit and the burning of handling equipment feeding rotary kiln coal powder injection pipe.
Embodiment 5
The brown coal that enter factory store through homogenizing, grind into fineness 0.08mm square hole sieve by the trapezoidal abrasive dust of superpressure then and tail over 2% coal dust, with the bituminous coal of making coal dust brown coal by mass percentage: bituminous coal 90%:10% homogenizing also is stored in the coal bunker, is fed in the decomposing furnace by metering outfit and handling equipment and burns.Bituminous coal is made homogenizing behind the coal dust, storage by the grinding machine grinding, then by metering outfit and the burning of handling equipment feeding rotary kiln coal powder injection pipe.
Embodiment 6
The brown coal that enter factory store through homogenizing, be broken into the particle of 3mm then by the double teeth roller grading machine, with the bituminous coal of making coal dust brown coal by mass percentage: bituminous coal 60%:40% homogenizing also is stored in the coal bunker, is fed in the decomposing furnace by metering outfit and handling equipment and burns.Bituminous coal is made homogenizing behind the coal dust, storage by the grinding machine grinding, then by metering outfit and the burning of handling equipment feeding rotary kiln coal powder injection pipe.
Embodiment 7
The brown coal that enter factory store through homogenizing, make fineness 0.08mm square hole sieve by middling speed micronizer grinding then and tail over 10% coal dust, with the bituminous coal of making coal dust brown coal by mass percentage: bituminous coal 50%:50% homogenizing also is stored in the coal bunker, is fed in the decomposing furnace by metering outfit and handling equipment and burns.Bituminous coal is made homogenizing behind the coal dust, storage by the grinding machine grinding, then by metering outfit and the burning of handling equipment feeding rotary kiln coal powder injection pipe.
Claims (9)
1. method of utilizing brown coal calcinings new type nonaqueous cement grog comprises decomposing furnace with coal and rotary kiln coal in the use of firing system coal, it is characterized in that also sending into decomposing furnace as calcinating fuel after the homogenizing with brown coal are broken.
2. method according to claim 1 is characterized in that in the described brown coal adding the bituminous coal and/or the hard coal of its 1～50% weight percent.
3. method according to claim 1 is characterized in that using in rotary kiln bituminous coal and/or hard coal as calcinating fuel.
4. method according to claim 1 is characterized in that described brown coal make fineness 0.08mm square hole sieve through grinding and tail over 2～10% coal dust.
5. method according to claim 4 is characterized in that described grinding is to carry out grinding by the combination of one of vertical pulverizing mill, high pressure overhang roll mill, middling speed micronizer, the trapezoidal mill of superpressure, Raymond mill or any two kinds of equipment.
6. according to any described method of claim 1 to 4, it is characterized in that described brown coal sulphur content≤1.5%.
7. according to any described method of claim 1 to 3, it is characterized in that described brown coal make granularity≤5mm through fragmentation.
8. method according to claim 7 is characterized in that described fragmentation is to carry out fragmentation by the combination of one of impact breaker, ring hammer crusher, flute profile Sizing Crusher, double teeth roller grading machine, double-geared roller crusher or any two kinds of equipment.
9. method according to claim 1 is characterized in that described decomposing furnace is the cyclone type decomposing furnace, the formula of spurting decomposing furnace, floated decomposing furnace, boiling type decomposing furnace or the whirlwind-formula of spurting decomposing furnace.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104326688A (en) * | 2014-09-28 | 2015-02-04 | 海拉尔蒙西水泥有限公司 | System and method for calcining cement clinker through lignite safely in large amount |
| CN106833708A (en) * | 2017-03-27 | 2017-06-13 | 华润水泥技术研发有限公司 | The method that specific kiln coal blending coal is instructed in cement industry |
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| CN101333085A (en) * | 2008-06-24 | 2008-12-31 | 中国矿业大学 | Novel process for preparing pulverized coal for enhancing production efficiency and quality of cement by dry method |
| CN101759382A (en) * | 2009-12-31 | 2010-06-30 | 阿荣旗蒙西水泥有限公司 | Production method for calcining cement clinker by brown coal |
| CN102061211A (en) * | 2011-01-04 | 2011-05-18 | 内蒙古工业大学 | Integral purified integration system and process of lignite in cement production through catalytic mild pyrolysis |
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- 2012-12-15 CN CN201210542862.8A patent/CN103214199B/en active Active
Patent Citations (3)
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| CN101333085A (en) * | 2008-06-24 | 2008-12-31 | 中国矿业大学 | Novel process for preparing pulverized coal for enhancing production efficiency and quality of cement by dry method |
| CN101759382A (en) * | 2009-12-31 | 2010-06-30 | 阿荣旗蒙西水泥有限公司 | Production method for calcining cement clinker by brown coal |
| CN102061211A (en) * | 2011-01-04 | 2011-05-18 | 内蒙古工业大学 | Integral purified integration system and process of lignite in cement production through catalytic mild pyrolysis |
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| 同济大学等: "《锅炉与锅炉房工艺》", 31 December 2011, article "褐煤", pages: 25 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104326688A (en) * | 2014-09-28 | 2015-02-04 | 海拉尔蒙西水泥有限公司 | System and method for calcining cement clinker through lignite safely in large amount |
| CN104326688B (en) * | 2014-09-28 | 2016-08-24 | 海拉尔蒙西水泥有限公司 | A kind of a large amount of, system and method for safe utilization brown coal calcination of cement clinker |
| CN106833708A (en) * | 2017-03-27 | 2017-06-13 | 华润水泥技术研发有限公司 | The method that specific kiln coal blending coal is instructed in cement industry |
| CN106833708B (en) * | 2017-03-27 | 2020-08-11 | 华润水泥技术研发有限公司 | Method for guiding coal blending of specific kiln in cement industry |
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