CN1994950A - Energy-saving environment-friendly cement clinker production method - Google Patents
Energy-saving environment-friendly cement clinker production method Download PDFInfo
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- CN1994950A CN1994950A CNA2006101615831A CN200610161583A CN1994950A CN 1994950 A CN1994950 A CN 1994950A CN A2006101615831 A CNA2006101615831 A CN A2006101615831A CN 200610161583 A CN200610161583 A CN 200610161583A CN 1994950 A CN1994950 A CN 1994950A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
- Y02P40/121—Energy efficiency measures, e.g. improving or optimising the production methods
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Abstract
The invention discloses a manufacturing method of energy-saving cement clinker, which is characterized by the following: sintering cement clinker; designing the diameter D of vertical kiln more than 4. 0m and the rate of height H and inner diameter D at 1. 6-0.81; feeding raw material ball with coal into kiln; moving the material ball from upwards to downwards and air from downwards to upwards; dividing the sintering kiln into preheating band, high-temperature sintering band and cooling band from upwards to downwards; dedusting through big bag; adopting round brick structure; purifying flue gas through big bag; draining; freezing cement clinker; adopting high-drag board to make the speed of air in the board gap at 40m/s; transmitting frozen clinker into clinker freezer through blanking pipe; cooling the clinker below 100 deg. c; making waste gas and flue gas of vertical kiln into big bag to dedust.
Description
Technical field
What the present invention relates to is a kind of energy-saving environment-friendly cement clinker production method, belongs to the cement constructional material technical field.
Background technology
The existing machinery shaft kiln is big because of its aspect ratio, its ventilation resistance is bigger, and major diameter shaft kiln windage is difficult for balance, and the kiln internal combustion is incomplete, noxious gas emission is higher, output is lower, and power consumption is higher, when it uses big bag-type dust equipment to gather dust, for avoiding the cloth bag dewfall, require shaft kiln wet feed layer thinner, the fire in a stove before fuel is added is more shallow, and coal consumption is bigger.The grog cooling system is relatively poor, kiln discharge clinker temperature height, and cooling performance is relatively poor, and clinker strength is relatively low, and free calcium oxide is higher relatively, and quality descends relatively.
Summary of the invention
The objective of the invention is to defective, propose a kind of novel energy-saving environment-friendly cement clinker production, have environmental protection at above-mentioned existence, energy-conservation, improve the quality characteristics such as reduce investment outlay.
Technical solution of the present invention: it is characterized in that processing step divides A, burning clinker of cement; B, big bag-type dust; C, cement clinker cooling.Described cement clinker calcining process A, burning clinker of cement shaft kiln, the diameter D of its shaft kiln be greater than 4.0m, the height H of shaft kiln: the inside diameter D of shaft kiln=1.6～0.8: 1; Contain the coal raw material ball in kiln top feeding kiln, pellet moves from top to bottom, and air moves from bottom to top, and calcining kiln is divided into three bands from top to bottom: preheating zone, high temperature clinkering zone and cooling zone; Described preheating zone: about 150 ℃ of temperature, the evaporative process of free water; Clay mineral dehydration and magnesiumcarbonate take place and begin to decompose in 150～750 ℃ of temperature; Because going into big cloth bag flue gas is mixed by kiln discharge flue gas and cooling machine waste gas, so the permission of kiln discharge flue-gas temperature is lower, therefore can thicken the preheating zone, increase wet material layer thickness, reduce coal consumption.Described clinkering zone: 750～800 ℃ of temperature, loss on ignition obviously reduces, carbonate decomposition and solid state reaction, because thermo-negative reaction, so temperature rise rate is slow. when temperature is raised to 1100 ℃, rate of decomposition increases sharply. and free calcium oxide reaches maximum value. and solid state reaction discharges a large amount of heats, material has risen 300 ℃, and at 1250～1300 ℃, calcium oxide penetrates radiance, the feasible branch material dark that ungirds, 1250～1450～1250 ℃ of temperature. begin to occur liquid phase at 1250～1280 ℃, at 1450 ℃, amount of liquid phase increases, free calcium oxide absorbs, the cement clinker compound formation.Described cooling zone: grog continues to move downward, and the secondary air lower with temperature meets, and clinker temperature descends, and general clinker temperature can be reduced to 300-500 ℃.
Described big cloth bag dedusting process B adopts circular brick mix structure, flue gas after big bag-type dust purifies, emptying.
Described cement clinker process for cooling C, adopt the high-drag grate plate, the grate plate resistance is more than the twice of common grate plate resistance, air passes grate plate slit generation speed and reaches 40m/s, enters chamotte cooler through preliminary refrigerative grog by tremie pipe, further cooling, pass through high wind speed this moment, big air quantity cold wind cools off fast, and clinker temperature is quickly fallen to below 100 ℃, and cooling machine waste gas and flue gas of shaft kiln enter big bag-type dust jointly.
Advantage of the present invention: it is little that calcining kiln has an aspect ratio, the calcining ventilation resistance is little in its kiln, the easy balance of windage in 2 kilns, the kiln internal combustion is complete, and noxious gas emission is few, and coal consumption is low, power consumption is low, unit cross-sectional area output height, big bag-type dust does not rely on the kiln calcining, i.e. and kiln calcining does not influence characteristics such as big bag-type dust use.Cement clinker cooler is a kind of quenching formula cooler, blow a cold wind over gas blower, to be layered on the grate plate the in addition quenching of lamellated grog, make clinker temperature by below 500 ℃ of left and right sides rapid drawdowns to 100 ℃, the intensity of grog improves greatly, and free calcium oxide reduces greatly, the refrigerative large quantity of exhaust gas is gone into big bag-type dust, guarantee big cloth bag spent air temperture, avoid dewfall, make big bag-type dust not influenced by vertical kiln operation.The cooler biggest advantage is exactly a forced ventilation, forces cooling, so drop temperature is low, clinker quality is good.Performance requriements is high cooling efficiency, high heat recovery rate and high operation factor.
Embodiment
The discharge nozzle of burning clinker of cement shaft kiln inserts the feeding pipe of cement clinker cooler, the big sack cleaner of the common access of the waste gas outlet pipe of cement clinker cooler and burning clinker of cement flue gas of shaft kiln outlet pipe.
Embodiment 1, and cement clinker calcining process A, burning clinker of cement shaft kiln, the diameter D of its shaft kiln be greater than 4.0m, the height H of shaft kiln: the inside diameter D of shaft kiln=1.6: 1; Contain the coal raw material ball in kiln top feeding kiln, pellet moves from top to bottom, and air moves from bottom to top, and calcining kiln is divided into three bands from top to bottom: preheating zone, high temperature clinkering zone and cooling zone;
Described preheating zone: about 150 ℃ of temperature, the evaporative process of free water; Clay mineral dehydration and magnesiumcarbonate take place and begin to decompose in 150 ℃ of temperature; Because going into big cloth bag flue gas is mixed by kiln discharge flue gas and cooling machine waste gas, so the permission of kiln discharge flue-gas temperature is lower, therefore can thicken the preheating zone, increase wet material layer thickness, reduce coal consumption.
Described clinkering zone: 750 ℃ of temperature, the ablation amount obviously reduces, carbonate decomposition and solid state reaction, because thermo-negative reaction, so temperature rise rate is slow. when temperature is raised to 1100 ℃, rate of decomposition increases sharply. and free calcium oxide reaches maximum value. and solid state reaction discharges a large amount of heats, material has risen 300 ℃, and at 1250～1300 ℃, calcium oxide penetrates radiance, the feasible branch material dark that ungirds, 1250～1450～1250 ℃ of temperature. begin to occur liquid phase at 1250～1280 ℃, at 1450 ℃, amount of liquid phase increases, free calcium oxide absorbs, the cement clinker compound formation.
Described cooling zone: grog continues to move downward, and the secondary air lower with temperature meets, and clinker temperature descends, and general clinker temperature can be reduced to 300 ℃.
Big cloth bag dedusting process B use circular brick mix structure, flue gas after bag-type dust purification greatly, emptying.Cement clinker process for cooling C, adopt the high-drag grate plate, the grate plate resistance is the twice of common grate plate resistance, air passes grate plate slit generation speed and reaches 40m/s, enters chamotte cooler through preliminary refrigerative grog by tremie pipe, further cooling, pass through high wind speed this moment, big air quantity cold wind cools off fast, and clinker temperature is quickly fallen to below 100 ℃, and cooling machine waste gas and flue gas of shaft kiln enter big bag-type dust jointly.
Embodiment 2
The diameter D of burning clinker of cement shaft kiln is greater than 4.0m, the height H of shaft kiln: the inside diameter D of shaft kiln=0.8: 1.Contain the coal raw material ball in kiln top feeding kiln, pellet moves from top to bottom, and air moves from bottom to top, and calcining kiln is divided into three bands from top to bottom: preheating zone, high temperature clinkering zone and cooling zone;
Described preheating zone: about 150 ℃ of temperature, the evaporative process of free water; Clay mineral dehydration and magnesiumcarbonate take place and begin to decompose in 750 ℃ of temperature; Because going into big cloth bag flue gas is mixed by kiln discharge flue gas and cooling machine waste gas, so the permission of kiln discharge flue-gas temperature is lower, therefore can thicken the preheating zone, increase wet material layer thickness, reduce coal consumption.
Described clinkering zone: 800 ℃ of temperature, the ablation amount obviously reduces, carbonate decomposition and solid state reaction, because thermo-negative reaction, so temperature rise rate is slow. when temperature is raised to 1100 ℃, rate of decomposition increases sharply. and free calcium oxide reaches maximum value. and solid state reaction discharges a large amount of heats, material has risen 300 ℃, and at 1250～1300 ℃, calcium oxide penetrates radiance, the feasible branch material dark that ungirds, 1250～1450～1250 ℃ of temperature. begin to occur liquid phase at 1250～1280 ℃, at 1450 ℃, amount of liquid phase increases, free calcium oxide absorbs, the cement clinker compound formation.
Described cooling zone: grog continues to move downward, and the secondary air lower with temperature meets, and clinker temperature descends, and general clinker temperature can be reduced to 500 ℃.
Big cloth bag dedusting process B use circular brick mix structure, flue gas after bag-type dust purification greatly, emptying.Cement clinker process for cooling C, adopt the high-drag grate plate, the grate plate resistance is the twice of common grate plate resistance, air passes grate plate slit generation speed and reaches 40m/s, enters chamotte cooler through preliminary refrigerative grog by tremie pipe, further cooling, pass through high wind speed this moment, big air quantity cold wind cools off fast, and clinker temperature is quickly fallen to below 100 ℃, and cooling machine waste gas and flue gas of shaft kiln enter big bag-type dust jointly.
Embodiment 3,
The diameter D of burning clinker of cement shaft kiln is greater than 4.0m, the height H of shaft kiln: 5 inside diameter D of shaft kiln=1.2: 1.Contain the coal raw material ball in kiln top feeding kiln, pellet moves from top to bottom, and air moves from bottom to top, and calcining kiln is divided into three bands from top to bottom: preheating zone, high temperature clinkering zone and cooling zone;
Described preheating zone: about 150 ℃ of temperature, the evaporative process of free water; Clay mineral dehydration and magnesiumcarbonate take place and begin to decompose in 150～750 ℃ of temperature; Because going into big cloth bag flue gas is mixed by kiln discharge flue gas and cooling machine waste gas, so the permission of kiln discharge flue-gas temperature is lower, therefore can thicken the preheating zone, increase wet material layer thickness, reduce coal consumption.
Described clinkering zone: 770 ℃ of temperature, the ablation amount obviously reduces, carbonate decomposition and solid state reaction, because thermo-negative reaction, so temperature rise rate is slow. when temperature is raised to 1100 ℃, rate of decomposition increases sharply. and free calcium oxide reaches maximum value. and solid state reaction discharges a large amount of heats, material has risen 300 ℃, and at 1250～1300 ℃, calcium oxide penetrates radiance, the feasible branch material dark that ungirds, 1250～1450～1250 ℃ of temperature. begin to occur liquid phase at 1250～1280 ℃, at 1450 ℃, amount of liquid phase increases, free calcium oxide absorbs, the cement clinker compound formation.
Described cooling zone: grog continues to move downward, and the secondary air lower with temperature meets, and clinker temperature descends, and general clinker temperature can be reduced to 400 ℃.
Big cloth bag dedusting process B use circular brick mix structure, flue gas after bag-type dust purification greatly, emptying.
Cement clinker process for cooling C, adopt the high-drag grate plate, the grate plate resistance is the twice of common grate plate resistance, air passes grate plate slit generation speed and reaches 40m/s, enters chamotte cooler through preliminary refrigerative grog by tremie pipe, further cooling, pass through high wind speed this moment, big air quantity cold wind cools off fast, and clinker temperature is quickly fallen to below 100 ℃, and cooling machine waste gas and flue gas of shaft kiln enter big bag-type dust jointly.
Because novel calcining kiln kiln height degree is low, reduced facility investment and kiln room construction investment, thereby the height that has reduced handling equipments such as lift has reduced the investment of handling equipment.The utility model and traditional mechanical vertical kiln are relatively, the electricity saving and energy saving effect is remarkable, because highly reducing windage descends, blower fan is interchangeable with the little motor of power, so power consumption is lower, the unit power consumption of kiln is a 5-8KWh/ ton grog, than low 3/4 (standard machinery shaft kiln unit power consumption is a 16-20KWh/ ton grog) of standard machinery shaft kiln, along with highly reducing, the wall effect of kiln reduces simultaneously, and the middle part ventilates and improves, the interior windage of kiln is balance more, effectively reduce coal consumption, improved unit cross section output, general heat consumption of clinker 650Kcal/kg-cl, grog standard coal consumption 95kg, the cross section output 6-8t/m2 of unit, when the shaft kiln internal diameter reaches 4.0m, and the unit day output of shaft kiln is broken through 2000 ton per days.Because unit cross section output improves, investment can be saved half under the prerequisite of equivalent production capacity; Because ventilation resistance is little, kiln ventilation improves, and helps burning till fast, so clinker quality is good, grog f-CaO descends, and 28 days ultimate compression strength of grog is greater than 65MPa, than the high 10-15Mpa of standard machinery shaft kiln; Because calcining fully in the kiln, noxious gas emission is few, produces more cleaning, more environmental protection.Because the height of kiln reduces, the temperature of kiln discharge grog improves, and we adopt the higher cooling machine of cooling efficiency.
Cooler adopts the high-drag grate plate, the grate plate resistance is far longer than common grate plate, and air passes grate plate slit generation speed and reaches 40m/s, by experiment as can be known, when speed reaches one regularly, the bed pressure of combing increases again, and wind speed does not change, and this just tells us to pass the cold wind of high-drag grate plate, when continuing across the bed of material, wind speed changes very little, and the result is for even by the cold wind speed on the bed of combing, and speed of cooling is even.So do not need too many air quantity.More since modern shaft kiln kiln discharge grog through the preceding road cooling of modern shaft kiln cooling system, clinker temperature reduces greatly, so that the cooling required airflow falls greatly is little, power of fan reduces, the electric weight of cooler reduces greatly; The integrated heat efficiency of cooler is brought up to more than 75% by about 60%.Owing to be requirement, so press close to more and the cooling requirement of suitable shaft kiln clinker at novel concrete calcining production technique.Adopt up-to-date coolant mechanism, the chemical constitution that grog can be cooled off fast to reach grog the best reaches good grindability.Fully improve wind-warm syndrome, be the manufacture of cement fuel saving, the heat consumption index of the grog 3-5% that descended.Eliminate the trouble spot of conventional cooler, make the operation factor of cooler can be synchronous with kiln.Adopt new methods for cooling and grate plate mechanism, the hot junction grate plate life-span is greatly improved.Simple in structure, easy to maintenance, be fit to China's actual conditions.Cooling machine waste gas enters big bag-type dust, and it is suitable to guarantee into big cloth bag flue-gas temperature, prevents dewfall and burns bag.
Big bag-type dust is owing to adopt circular brick mix structure, solved difficult shortcoming of repairing after the corrosion of circular steel structure fly-ash separator, and has that less investment, cost are low, the casing part does not need to do insulation rotproofing, advantages such as long service life; Adopt measures such as computer control, chamber-dividing counter-blowing deashing, temperature detection demonstration and auto-control, efficient, steady running, the outlet emission concentration is lower than national standard, can reach below the 50mg/Nm3.Following air inlet structure design avoids Mars to wash away filter bag, the safety coefficient height; Adopt computerized control system, multi-point temperature measurement auto temperature controlled system, operating safety, stable, reliable; Adopt pulsation recoil ash-clearing technology, ash-removal effect is good, energy consumption is low, moving parts is few, maintenance capacity is few; Adopt brick to mix the load larrying member design, Stability Analysis of Structures, antidetonation decontrol split grade height, main body long service life, corrosion-resistant, good heat insulating, adaptability is strong.
Be compared as follows table with advanced shaft kiln enterprise of domestic part and dry-process rotary kiln economic and technical norms:
| Kiln type classification | 28 days ultimate compression strength (Mpa) of grog | Heat consumption of clinker (KJ/Kg) | The comprehensive power consumption of cement (degree/ton cement) | Crew's work productive rate (t/ people .a) | " three wastes " utilization ratio (%) |
| This calcining kiln | ≥65 | 2700 | 40 | ≥4000 | 85 |
| The novel modern times | 60.1 | 3382 | 49.8 | ＞2000 | 81.8 |
| Shaft kiln | |||||
| The advanced shaft kiln of domestic part | 53-60 | 3500 | 70 | ＞1000 | ＞30 |
| General shaft kiln | 45-53 | 4200 | 90 | 200-300 | 15-30 |
| The 700t/d new dry process | 53-60 | 3800 | 125 | 700 | ＞30 |
| The 1000t/d new dry process | 53-60 | 3500 | 110 | ＞1000 | ＞30 |
| The 2000t/d new dry process | 53-60 | 3300 | 100 | ＞2000 | ＞30 |
| The 4000t/d new dry process | 53-60 | 3200 | 90 | ＞4000 | ＞30 |
| Wet method | 53-60 | 5400 | 100 | 600 | ＞30 |
| Wet grinding and dry burning | 53-60 | 3800 | 110 | ＞1000 | ＞30 |
The present invention has realized the transformation to high-quality, energy-conservation, joint consumption direction of shaft kiln enterprise as seen from the above table, realized the shaft kiln sustained development of enterprises, shine shaft kiln enterprise great vitality more, for a road that has more prospect is explored in the survival and development of vast shaft kiln enterprise.
Claims (4)
1, energy-saving environment-friendly cement clinker production method is characterized in that processing step divides A, burning clinker of cement, B, big bag-type dust, C, cement clinker cooling; Described cement clinker calcining process A, burning clinker of cement shaft kiln, the diameter D of its shaft kiln be greater than 4.0m, the height H of shaft kiln: the inside diameter D of shaft kiln=1.6～0.8: 1; Contain the coal raw material ball in kiln top feeding kiln, pellet moves from top to bottom, and air moves from bottom to top, and calcining kiln is divided into the preheating zone from top to bottom, high temperature clinkering zone and cooling zone; Described big cloth bag dedusting process B adopts circular brick mix structure, flue gas after big bag-type dust purifies, emptying; Described cement clinker process for cooling C, adopt the high-drag grate plate, the grate plate resistance is common grate plate resistance twice, air passes grate plate slit generation speed and reaches 40m/s, enters grog cooling machine through preliminary refrigerative grog by tremie pipe, further cooling, pass through high wind speed this moment, big air quantity cold wind cools off fast, and clinker temperature is quickly fallen to below 100 ℃, and cooling machine waste gas and flue gas of shaft kiln enter big sack cleaner jointly.
2, energy-saving environment-friendly cement clinker production method according to claim 1 is characterized in that described preheating zone, about 150 ℃ of temperature, the evaporative process of free water; Clay mineral dehydration and magnesiumcarbonate take place and begin to decompose in 150～750 ℃ of temperature; Because going into big cloth bag flue gas is mixed by kiln discharge flue gas and cooling machine waste gas, so the permission of kiln discharge flue-gas temperature is lower, therefore can thicken the preheating zone, increase wet material layer thickness, reduce coal consumption.
3, energy-saving environment-friendly cement clinker production method according to claim 1, it is characterized in that described clinkering zone, 750～800 ℃ of temperature, the ablation amount obviously reduces, carbonate decomposition and solid state reaction, because thermo-negative reaction, so temperature rise rate is slow. when temperature is raised to 1100 ℃, rate of decomposition increases sharply. and free calcium oxide reaches maximum value. and solid state reaction discharges a large amount of heats, material has risen 300 ℃, and at 1250～1300 ℃, calcium oxide penetrates radiance, the feasible branch material dark that ungirds, 1250～1450～1250 ℃ of temperature. begin to occur liquid phase at 1250～1280 ℃, at 1450 ℃, amount of liquid phase increases, free calcium oxide absorbs, the cement clinker compound formation.
4, energy-saving environment-friendly cement clinker production method according to claim 1 is characterized in that described cooling zone, and grog continues to move downward, and the secondary air lower with temperature meets, and clinker temperature descends, and general clinker temperature can be reduced to 300-500 ℃.
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| CNB2006101615831A CN100412021C (en) | 2006-12-28 | 2006-12-28 | Energy-saving environment-friendly cement clinker production method |
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| CNB2006101615831A CN100412021C (en) | 2006-12-28 | 2006-12-28 | Energy-saving environment-friendly cement clinker production method |
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| CN1994950A true CN1994950A (en) | 2007-07-11 |
| CN100412021C CN100412021C (en) | 2008-08-20 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102757189A (en) * | 2012-07-25 | 2012-10-31 | 大同煤矿集团有限责任公司 | Parameter proportion of slow setting cement for highway construction |
| CN111777346A (en) * | 2020-07-23 | 2020-10-16 | 方苏峤 | Quick burning method for cement clinker |
| CN113045229A (en) * | 2021-03-09 | 2021-06-29 | 文县祁连山水泥有限公司 | Process for improving 28-day strength of clinker |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1017082B (en) * | 1986-08-30 | 1992-06-17 | 四川建筑材料工业学院 | Novel vertical kiln |
| CN2454740Y (en) * | 2000-12-11 | 2001-10-17 | 金雪浦 | Fluidized-cement vertical kiln |
| CN2557210Y (en) * | 2002-06-13 | 2003-06-25 | 江裕咸 | Cooling type vertical kiln dust remover |
-
2006
- 2006-12-28 CN CNB2006101615831A patent/CN100412021C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102757189A (en) * | 2012-07-25 | 2012-10-31 | 大同煤矿集团有限责任公司 | Parameter proportion of slow setting cement for highway construction |
| CN102757189B (en) * | 2012-07-25 | 2014-01-15 | 大同煤矿集团有限责任公司 | Parameter proportion of slow setting cement for highway construction |
| CN111777346A (en) * | 2020-07-23 | 2020-10-16 | 方苏峤 | Quick burning method for cement clinker |
| CN113045229A (en) * | 2021-03-09 | 2021-06-29 | 文县祁连山水泥有限公司 | Process for improving 28-day strength of clinker |
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| CN100412021C (en) | 2008-08-20 |
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