CN1021783C - Production process for gangue low temp. cement and fluid-bed calciner plant - Google Patents
Production process for gangue low temp. cement and fluid-bed calciner plant Download PDFInfo
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- CN1021783C CN1021783C CN 90103361 CN90103361A CN1021783C CN 1021783 C CN1021783 C CN 1021783C CN 90103361 CN90103361 CN 90103361 CN 90103361 A CN90103361 A CN 90103361A CN 1021783 C CN1021783 C CN 1021783C
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- coal gangue
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Abstract
The present invention discloses a method for producing low-temperature cement of coal gangue and calcining devices of a fluidized bed thereof. A raw material is made from the main raw materials of coal gangue and calcium oxide by the processes of reasonable formulation, steaming maintenance, etc. The raw material is put in calcining devices of a fluidized bed, comprising a preheating zone 2, a high bed controller 6, a clinker cooler 11 and the like, and is calcined into cement clinker at a temperature of 750 DEG C to 850 DEG C. The utilization rate of the coal gangue reaches 70% more or less. The calcining temperature is low, and the utilization rate of residual heat is high.
Description
The present invention relates to a kind of production method and fluidized bed calcining device thereof of low heat cement.
Along with the continuous development of production technology, the coal in China produced quantity is in continuous increase, and the coal gangue quantity discharged is also increasing considerably simultaneously.The bulk deposition of coal gangue not only takies the field, and environmental pollution, HUMAN HEALTH bring a lot of harm.In order to reduce gangue hazard, the comprehensive development and utilization of coal gangue has been subjected to generally paying attention to.At cement industry, coal gangue has been used as the blended material of silicate cement owing to itself Chemical Composition and mineral composition.Also can be used as simultaneously one of main raw material of few grog and clinker-free cement.But amount exists problems such as coal gangue utilization ratio strength of cement low or that produce is not high in the such use.
Fluidized-bed is since nineteen forty-two is born, because its unique motion characteristics and combustion system have obtained using widely in all trades and professions.At present, fluidized-bed is introduced into cement industry as a kind of novel concrete roasting assembly.But, in fluidized-bed, burn till for the cement grog and bring certain difficulty because the firing temperature of ordinary Portland cement and the normal operating temperature of fluidized-bed differ bigger; In addition, it is the quick burning that belongs under the high-temperature gradient that cement clinker is calcined in fluidized-bed, and the explosion so raw material ball very easily weares and teares in bed reduces the grog rate of recovery, and the economy of the fluidized bed calcination cement clinker that makes is not high.In view of the economy and the technical elements problem of fluidized bed calcination cement clinker, and make it be difficult to utilization and extention.
The object of the invention is exactly to propose a kind of new low heat cement production method and fluidized bed calcining device thereof, to solve above-mentioned two aspect problems.
Production method of the present invention is achieved in that according to the hydro-thermal composition principle, with coal gangue, unslaked lime and other addition material of certain proportioning mix, clear up, moulding, steam-cured certain hour under normal pressure thereafter; The steam-cured pellet that comes out is put into fluidized-bed at a certain temperature and is sintered into cement clinker.Because the synthetic booster action to the storeroom reaction of hydro-thermal, raw material generally can burn till in 750 ℃～850 ℃ scopes.Its temperature is more much lower than ordinary Portland cement firing temperature, and can burn till coal gangue low heat cement grog fully in fluidized-bed.
Fluidized bed calcining device main points of the present invention are: fluidized bed combustion is combined with cement burning, be under the fuel situation with coal gangue (or other low grade coal), by in fluidized-bed, setting up preheating zone, clinker cooler, height of bed controller, and under 750 ℃～850 ℃ low temperature, calcine out the coal gangue low heat cement grog that ultimate compression strength is higher than the 325# label.
Low heat cement fluidized bed calcining device structural representation as shown in Figure 1, air compartment 4 is positioned at the bottom, fluidized-bed is followed successively by from down going up structural arrangement: air distribution plate 3, firing zone 1, air distribution plate 5, one group of height of bed controller 6, preheating zone 2 and flue 7; Raw material feeder 8 is located at that preheating zone 2 upper left quarters, fuel feeder 14 are positioned at firing zone 1 right side and in air distribution plate 3 upper ends in addition; Upflow tube 9 is stretched out by firing zone 1 left side and is coupled on the clinker cooler 11; End slag pipe 13 begins to pass air compartment 4 by air distribution plate 3; Sealing gland rotary feeder 10 is positioned at upflow tube 9 middle parts.
Fig. 2 is the structural representation of height of bed controller 6.By Fig. 1 and Fig. 2 as seen, its elephant trunk 16 passes air distribution plate 5 by preheating zone 2 and enters firing zone 1, and elephant trunk 16 end openings are positioned at firing zone 1 top and are blocked by the conical plug 17 that the spring 15 that is coupled on the air distribution plate 5 is drawing.Spring 15 two ends are coupled to respectively on the base plate of air distribution plate 5 and conical plug 17.
For the fluidizing velocity that makes firing zone 1 and preheating zone 2 is complementary, require firing zone 1 sectional area bigger than the sectional area of preheating zone 2, its sectional area ratio is decided according to temperature, raw material amount, the firing temperature of preheating zone 2.
The working process of fluidized bed calcining device of the present invention is: the cold wind of being sent here by gas blower enters in the clinker cooler 11, and cold wind absorbs heat and heats up at the cooling grog simultaneously; After the preheating air through air compartment 4 voltage stabilizings after air distribution plate 3 enter in the firing zone 1; In firing zone 1, air and fuel feeder 14 are sent into the fuel mix burning, thereby the cement slurry in the firing zone 1 is burnt till; Burning back flue gas, pass air distribution plate 5 preheating zone 2 in the preheated raw meal ball after flue 7 discharges;
Raw material ball infeeds preheating zone 2 preheatings by raw material feeder 8, when the bed height of preheating zone 2 surpasses the spring 15 setting pulling force of height of bed controller 6, conical plug 17 is opened automatically, raw material ball enters the calcining of firing zone II through staying pipe 16, the height of bed drops to certain altitude, and conical plug 17 is retracted original position by spring 15 again; The grog that burns till in the firing zone 1 flows under the control of sealing gland rotary feeder 10 in the clinker cooler 11 through upflow tube 9, and cooling back grog is discharged through discharge nozzle 12.
Coal gangue low heat cement production method is among the present invention: coal gangue, unslaked lime, crystal seed, dihydrate gypsum are prepared burden by a certain percentage, and its proportioning is: coal gangue: 60～80%; Unslaked lime: 20～40%; Mix crystal seed 1～5% outward; Mix dihydrate gypsum outward: 0.5～4%; Wherein crystal seed adopts activated and contains the material of gelling mineral.The material of working good is mixed stirring, and add 20～40% water, unslaked lime is fully cleared up; Clear up back material at the certain pressure compacted under, make it to become can be in fluidized-bed incinerating 8～10mm pellet; Thereafter under 100 ℃ of normal pressures, steam-cured 4～10 hours, make it synthesize hydrated product, drop into again in the fluidized bed calcining device earlier through 500～650 ℃ of preheatings 60～240 seconds again 750～850 ℃ of temperature lower calcinations 300～1200 seconds; To can obtain the coal gangue low heat cement grog that intensity is higher than the 325# label after calcination of chamotte discharge and the cooling.
The most preferred embodiment of production method of the present invention is: proportioning raw materials is: coal gangue 75%; Unslaked lime 25%; Mix crystal seed 3% outward; Mix dihydrate gypsum 2% outward; And add 25% water and make to clear up watering quantity; Steam-cured 8 hours, 600 ℃ of following preheatings 120 seconds; Calcined 600 seconds down at 800 ℃ at last.
The present invention utilizes coal gangue to produce the coal gangue low heat cement grog of intensity more than the 325# label according to the hydro-thermal composition principle, solved successfully that coal gangue utilization in the manufacture of cement is few, fluidized bed calcination cement temperature height, less economical problem.Simultaneously, the cement temperature is low because this method is burnt till, calcination time is short, the utilization rate of waste heat height, and embody higher energy-conservation value and practical value.
Claims (5)
1, a kind of coal gangue low heat cement fluidized bed calcining device, it comprises upper and lower two laminarized areas: firing zone 1, preheating zone 2; Upper and lower two air distribution plates: air distribution plate 3 and air distribution plate 5; Be positioned at the air compartment 4 below the air distribution plate 3; The raw material feeder 8 in 2 left sides, preheating zone; The fuel feeder 14 of firing zone 1 both sides; Upflow tube 9; The clinker cooler 11 that links with upflow tube 9; The sealing gland rotary feeder 10 that upflow tube 9 middle parts are provided with and be coupled to preheating zone 2 and firing zone 1 and pass one group of height of bed controller 6 of air distribution plate 5 is characterized in that:
A: height of bed controller 6 is made up of elephant trunk 16, spring 15 and conical plug 17.
B: firing zone 1 is positioned at below the preheating zone 2 and the bed sectional area of firing zone 1 must be greater than the bed sectional area of preheating zone 2.
2, the described coal gangue low heat cement of claim 1 fluidized bed calcining device is characterized in that: spring 15 two ends in the height of bed controller 6 are coupled to respectively on the base plate of air distribution plate 5 and conical plug 17; The round mouth of conical plug 17 elephant trunk 16 of must under spring 15 effects, freely coming in and going out, and can block 16 end of elephant trunk mouth bottom it.
3, a kind of coal gangue low heat cement production method is characterized in that: it is after coal gangue, unslaked lime, crystal seed, dihydrate gypsum as raw material are mixed, to add water compound is cleared up, and makes its moulding afterwards; After the moulding under normal pressure steam-cured certain hour, steam-cured product enters fluidized bed calcining device preheating, calcining at last.
4, the described coal gangue low heat cement of claim 3 production method is characterized in that:
A: proportioning raw materials is:
Coal gangue: 60～80%; Unslaked lime: 20～40%;
Mix crystal seed outward: 1～5%; Mix dihydrate gypsum outward: 0.5～4%;
B: adding the watering quantity that water clears up is: 20～40%;
C: making condition: normal pressure, 100 ℃;
D: steam-cured time: 4～10 hours.
E: preheating condition: 500～650 ℃ of preheatings, 60～240 seconds.
F: calcination condition: calcined 300～1200 seconds for 750～850 ℃.
5, claim 3,4 described coal gangue low heat cement production methods is characterized in that:
A: proportioning raw materials:
Coal gangue: 75%; Unslaked lime: 25%
Mix crystal seed outward: 3%; Mix dihydrate gypsum 2% outward
B: add water and clear up watering quantity: 25%
C: steam-cured time: 8 hours
D: preheating condition: 600 ℃, preheating 120 seconds.
E: calcination condition: 800 ℃ of calcinings, 600 seconds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90103361 CN1021783C (en) | 1990-07-01 | 1990-07-01 | Production process for gangue low temp. cement and fluid-bed calciner plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90103361 CN1021783C (en) | 1990-07-01 | 1990-07-01 | Production process for gangue low temp. cement and fluid-bed calciner plant |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1057821A CN1057821A (en) | 1992-01-15 |
| CN1021783C true CN1021783C (en) | 1993-08-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90103361 Expired - Fee Related CN1021783C (en) | 1990-07-01 | 1990-07-01 | Production process for gangue low temp. cement and fluid-bed calciner plant |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1044872C (en) * | 1993-10-17 | 1999-09-01 | 钟显亮 | No-waste usage of gangue |
| CN102464458B (en) | 2011-11-28 | 2013-04-03 | 泸州兰良水泥有限公司 | Method and equipment for calcining blending material with high activity by feeding out of kiln head |
| CN107976010B (en) * | 2017-12-29 | 2021-03-19 | 上海电气集团股份有限公司 | Two-stage feeding drying device, biomass gasification furnace and two-stage feeding drying method |
| CN109485278B (en) * | 2018-12-13 | 2021-05-04 | 扬州大学 | Cementing material using coal gangue as raw material and preparation method thereof |
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1990
- 1990-07-01 CN CN 90103361 patent/CN1021783C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1057821A (en) | 1992-01-15 |
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