CN101126592A - Coal granule drying process and apparatus - Google Patents
Coal granule drying process and apparatus Download PDFInfo
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- CN101126592A CN101126592A CNA2007101179589A CN200710117958A CN101126592A CN 101126592 A CN101126592 A CN 101126592A CN A2007101179589 A CNA2007101179589 A CN A2007101179589A CN 200710117958 A CN200710117958 A CN 200710117958A CN 101126592 A CN101126592 A CN 101126592A
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Abstract
The utility model relates to a drying technology of coal powder, which comprises following steps: (1) pre-drying coal lumps; (2) transporting the pre-dried coal lumps to a crusher for crushing, making the diameter of the crushed coal powder at 3 to 10 mm; (3) transporting the coal powder to a tubular dryer and heating the coal powder by a heater with hot steam; (4) rotating the tubular dryer and introducing airflow so as to take out the steam spent after heating dust and coal powder; (5) collecting the coal powder which come out from the tubular dryer directly for use; (6) introducing the dust and the spent steam brought out by the carrying air to a dust treatment system. The utility model also provides a drying equipment of coal powder and can dry lignite coal powder using the drying technology of the utility model. The utility model has advantages of simple drying technology process, reliable operation of the drying device, and high efficiency, and also the application to industries such as other coal types and chemical industry for dewatering by drying process of granular material and wet material.
Description
Technical field
The present invention relates to a kind of coal granule drying process and equipment, particularly relate to a kind of brown coal coal granule drying process and equipment.
Background technology
China is one of country of rich coal resources in the world, and coal reserves is much larger than the oil and natural gas reserves.Wherein the brown coal reserves account for 14%.Brown coal mainly are distributed in provinces such as Yunnan, the Inner Mongol, northeast, Sichuan, and are used to direct combustion power generation.Brown coal contain the moisture about 20%～50%.So not only freight charges are very expensive for high moisture, and it is serious to participate in combustion heat loss directly.Improving the competitiveness of brown coal in combustion power generation, is the technical barrier that vast brown coal electricity power enterprise faces.Traditional heated air drying loss is big, and drying efficiency is low, and the product instability can not adapt to the drying of high-moisture brown coal.So, must take other drying medium and equipment to carry out at the brown coal drying of high-moisture.In recent years, the country of high-moisture brown coal is rich in all at drying process and the equipment of research and development at brown coal in Australia, Germany, Greece, the U.S. etc.The superheated steam heating is a kind of novel dried technology of very suitable dry brown coal, becomes the emphasis of dry technology research and development in the world in recent years.Studies show that: utilize the superheated steam heat drying can be so that equipment volume reduces, thermal efficiency height, safe and reliable.
CN200610080589.6 discloses a kind of pulverized coal drying process and equipment, and its drying process comprises the steps: to charge into nitrogen in rotary drying machine and revolution cooler, and measures wherein oxygen concentration, stops to charge into nitrogen when oxygen concentration is lower than 15%; Start rotary drying machine and revolution cooler, with being lower than 150 ℃ of water vapour heating rotary dryers, turn round cooler with water quench, importing coal dust continuously to rotary drying machine dries, with after producing water vapour in the drying course and carrying out dedusting, condensation, demist and handle, be heated into dry unsaturation gas again and be transmitted back in the rotary drying machine; To be dried moisture and send into revolution less than 3% coal dust and cool off in the cooler, and be delivered to the cloth-bag type dust collector by nitrogen and carry out finished product and reclaim.A kind of coal dust drying equipment is provided for this reason, has comprised rotary drying machine, revolution cooler, cloth-bag type dust collector, charged into the mechanism of nitrogen etc. to rotary drying machine and revolution cooler.This pulverized coal drying process and equipment be particle diameter at coal dust at 1.5mm, particularly 1.0mm and coal dust water content to be dried design less than 15%, the coal dust water content after the oven dry is lower than 2%.Described drying process and equipment complexity, wherein this equipment comprises the revolution cooler and must charge into the mechanism of nitrogen to rotary drying machine and revolution cooler, the product of all handling well all reclaims by the cloth-bag type dust collector.In addition, the processing cost height is not suitable for the processing of the powder coal of greater particle size.
Summary of the invention
The present invention is intended to overcome weak point of the prior art, and proposes a kind of coal granule drying process and equipment, and this drying process and equipment are simple and reliable, and the coal grain that can process low moisture content at low cost is brown coal coal grain particularly, constant product quality.
For this reason, the invention provides a kind of drying process of coal grain, may further comprise the steps:
(1) predrying coal cinder;
(2) coal cinder of predrying mistake is delivered to disintegrating machine and carries out fragmentation, make coal particle size after the fragmentation between 3-10mm;
(3) the coal grain is transported in the tube drier, it is heated with the heater that feeds superheated steam;
(4) the described tube drier of rotation and to its input air-flow is taken away with the steam that dust and coal grain heating back is produced;
(5) the coal grain that comes out from described tube drier directly is collected and for using;
(6) will import dust and the steam input dust treatment system that air-flow is taken out of.
The drying process of above-mentioned coal grain is particularly useful for brown coal, and wherein the coal particle size after the fragmentation is preferably in 5～8mm.
The further feature of technology according to the present invention also comprises the coal grain after the fragmentation through conveyor delivery to a coal bunker in that step (3) is preceding, and weighs according to the requirement of inlet amount earlier before this coal bunker enters drier.
Described dust treatment system comprises fiber bag precipitator, exhaust blower and low-pressure nitrogen blowback system, is blown in the fiber bag precipitator as reverse gas cleaning gas with low-pressure nitrogen, and discharges with the gas of exhaust blower after with described fiber bag precipitator dedusting.
According to the present invention, the water content of the coal cinder of described predrying mistake can be up to 35wt%.The coal grain water content of coming out through described tube drier is low to moderate 3.5wt% most less than 7.0wt%.
The tube drier rotating speed that step (3) relates to is at 2～20r/min, preferably at 5～10r/min.Water vapor pressure is 0.01～0.5MPa, preferred 0.4～0.5MPa, 120～200 ℃ of vapor (steam) temperatures, preferred 130～175 ℃.The steam inlet flow for example can be 3000～6000kg/h, coal grain inlet amount 5～10t/h.
In this drying process, described low-pressure nitrogen pressure is 0.1～1MPa, preferred 0.4～0.6Mpa, 20～50 ℃ of temperature.The air quantity of sack cleaner exhaust blower for example is 5000～14000m
3/ h, operating temperature is 60～150 ℃, adopts the recirculated water cooling, 20～40 ℃ of cooling waters.It for example is 5000～10000m that sack cleaner is handled air quantity
3, the dust granularity is less than 1mm.
The present invention also provides a kind of coal grain drying equipment, comprising:
Be used to carry the conveyer of predrying coal cinder;
The predrying coal cinder that described conveyor delivery is come carries out broken disintegrating machine, makes coal particle size after the fragmentation between 3 to 10mm;
Tube drier, the axle of this tube drier is with respect to horizontal tilt, and its shell side feeds superheated steam, is used to heat the coal grain in the tube side;
Rotate the drive unit of described tube drier;
The dust treatment system; It is characterized in that also comprising:
To the device of described tube drier input air-flow, take described dust treatment system to steam with dust and coal grain heating back generation;
The device of the readymade coal grain that collection is directly come out from described tube drier.
According to a further general feature of the present invention, tube drier axioversion degree is 0～30 °, preferred 5～10 °.In addition, the described equipment device of weighing according to the requirement of inlet amount earlier before also comprising the coal bunker that stores the coal grain after the fragmentation and entering described tube drier from coal grain storehouse.Described gathering-device is an embedded scraper transporter.
Described dust treatment system comprises fiber bag precipitator, exhaust blower and low-pressure nitrogen blowback system, described low-pressure nitrogen blowback system is blown in the fiber bag precipitator as reverse gas cleaning gas with low-pressure nitrogen, and described exhaust blower is discharged the gas of described fiber bag precipitator.
Compare with existing coal drying process, coal granule drying process of the present invention, with the superheated steam is heat medium, the drying efficiency height, whole drying technology process and equipment are simple, particularly to the drying effect of brown coal coal grain better (the brown coal water content is reduced to 3.5wt% by 35wt%), and constant product quality.
The accompanying drawing summary:
Accompanying drawing 1 is the skeleton diagram of coal grain drying equipment.
The specific embodiment:
For better explanation the present invention, the characteristics of further introducing realization of the present invention and being had below by instantiation, but can not be interpreted as can practical range to the present invention qualification.
As shown in Figure 1, coal grain drying equipment mainly comprises kibbler roll 4, tube drier 9 and dust treatment system 12.The coal cinder that is arranged in coal bunker 1 is transported to kibbler roll 4 broken coal-forming grains by ribbon conveyer 2 and 3 (the conveyer quantity apparent distance is decided) after weighing, the coal grain is transported to bucket elevator 6 through ribbon conveyer 5 then, and the height that is risen to regulation by the latter is put in the coal bunker 7.Be provided with weighing device 8 below the coal bunker 7, be transported to equably in the tube drier 9 that is in tilted layout by pipeline after weighing according to the requirement of inlet amount.The heater that feeds superheated steam is housed in the described tube drier 9 heats the coal grain that is transported in the described tube drier.Described superheated steam is input in the heater by pipeline 15.
Superheated steam feeds from the central tube that is positioned at tube drier 9 inputs, and the tube wall of this central tube has some apertures at circumferencial direction vertically, and the postmedian of central tube has the baffle plate sealing.Described like this superheated steam can flow through to the space (shell side) between the cylinder inner wall of described central tube outer wall and drier 9.Described shell side is furnished with some drying tubes vertically.The input of drying tube links to each other with the air stream and/or the nitrogen of coal grain to be dried and input.Also be provided with spiral bar in the described drying tube, be used for reaching the best thermal effect that adds in water conservancy diversion and the path of increase coal grain in pipe.Described superheated steam is what to separate with the air stream and/or the nitrogen that blast all the time.
By setting the rotating speed rotation, and end of its input coal grain is higher than output to described tube drier 9 by a gear device, and links to each other with an air blast 16 by pipeline, so that air or nitrogen stream are blown on the heated coal grain.The steam that described air itself produces when flowing dust in the coal grain and coal grain drying is taken away.Air stream can replace with other air-flow (for example nitrogen).
Directly collect for using from the readymade coal grain that described tube drier 9 comes out through embedded scraper transporter 10.The steam that the coal grain produces when dry enters atmosphere after purifying by the dust treatment system.Described superheated steam flows through to be reheated behind the heater and recycles, or enters flash vessel 11 condensations, surplus vapour emptying, condensed water discharging or reclaim.
The dust treatment system mainly comprises fiber bag precipitator 12, exhaust blower 13 and low-pressure nitrogen blowback system 14, described low-pressure nitrogen blowback system is blown in the fiber bag precipitator as reverse gas cleaning gas with low-pressure nitrogen, and described exhaust blower is discharged the gas of described fiber bag precipitator.Remaining dust is discharged from fiber bag precipitator 12 bottoms at last.
Example 1
1, pre-dried brown coal is delivered in the coal bunker 1, the water content of brown coal is about 35%, the particle diameter of brown coal piece is less than 50mm, from last coal bunker 1, coal is put on the Gravimetric Coal Feeders, weigh the back by ribbon conveyer 2,3 are transported to brown coal and carry out fragmentation in the kibbler roll 4, fragmentation is at room temperature carried out, brown coal particle diameter after the fragmentation is between 3mm-6mm, coal grain after the fragmentation is transported to bucket elevator 6 inlets through another ribbon conveyer 5, the coal grain rises to the 23.5m height through bucket elevator 6, sends into then in the broken coal storehouse 7.
2, the coal grain is by being put in the Gravimetric Coal Feeders in the broken coal storehouse, is transported to equably in the tube drier by pipeline according to the requirement of the inlet amount back of weighing, and the speed setting of pipe drier is 5r/min, and delivery rate is set at 3t/h, and air mass flow is 4m
3/ min, the inlet pressure of steam are 0.185Mpa, steam inlet flow 3370kg/h, and temperature is 133 ℃, and dried coal grain finished product is directly collected through embedded scraper transporter 10, and dust enters dust treatment system 12, and steam enters flash vessel 11.
3, the dust treatment system is made of fiber bag precipitator 12, exhaust blower 13 and low-pressure nitrogen blowback system 14, and the processing air quantity of sack cleaner 12 is 8000-10000m
3, the flue-gas temperature 80-100 of inlet ℃; The air quantity of exhaust blower 13 is 6520m
3/ h, operating temperature is 120 ℃, adopts the recirculated cooling water cooling; Low-pressure nitrogen is as reverse gas cleaning gas, pressure 0.4-0.6Mpa, and temperature is 40 ℃.
4, used steam enters in the flash vessel by pipeline, through condensation, residual air emptying, and condensed water discharging or recovery.
5, drying back coal grain is not higher than 5.2wt% through the check water content.
Example 2
1, will need dry brown coal to deliver in the coal bunker 1, the water content of brown coal is about 33%, the particle diameter of brown coal piece is less than 50mm, from last coal bunker 1, coal is put on the Gravimetric Coal Feeders, weigh the back by ribbon conveyer 2,3 are transported to brown coal and carry out fragmentation in the kibbler roll 4, fragmentation is at room temperature carried out, brown coal particle diameter after the fragmentation is between 5mm-8mm, coal grain after the fragmentation is transported to bucket elevator 6 inlets through another ribbon conveyer 5, the coal grain rises to the 23.5m height through bucket elevator 6, puts into broken coal storehouse 7 then.
2, the coal grain is put in the Gravimetric Coal Feeders by the broken coal storehouse, is transported to equably in the tube drier by pipeline after weighing according to the requirement of inlet amount, and the speed setting of pipe drier is 6r/min, and delivery rate is set at 6t/h, and air mass flow is 4m
3/ min, the inlet pressure of steam are 0.3Mpa, steam inlet flow 4700kg/h, and temperature is 175 ℃, and dried coal grain finished product is directly collected through embedded scraper transporter 10, and dust enters dust treatment system 12, and steam enters flash vessel 11.
3, the air quantity of sack cleaner exhaust blower 13 is 10000m
3/ h, operating temperature is 120 ℃, adopts the recirculated cooling water cooling; Blowback system low-pressure nitrogen pressure 0.4-0.6Mpa, temperature is 40 ℃.
4, used steam enters in the flash vessel by pipeline, through condensation, residual air emptying, and condensed water discharging or recovery.
5, drying back coal grain is not higher than 5.2wt% through the check water content.
Example 3
Other condition is the same with example 2, and just the brown coal particle diameter after the fragmentation is between 8mm-10mm, and dry back coal grain is not higher than 5.2wt% through the check water content.
, be not to limit the invention to any clear and definite described form more than just in order to represent and to describe the explanation that technology of the present invention and equipment are made example.Those of skill in the art will recognize that under the prerequisite that does not exceed the scope of the invention, can carry out various modification and can be with being equal to substitute any key element.Under the prerequisite that does not exceed scope of the present invention or spirit, the present invention can also be according to not implementing in this description and the mode that illustrates.Scope of the present invention is only limited by follow-up claims.
Claims (20)
1. the drying process of a coal grain may further comprise the steps:
(1) predrying coal cinder;
(2) coal cinder of predrying mistake is delivered to disintegrating machine and carries out fragmentation, make coal particle size after the fragmentation between 3-10mm;
(3) the coal grain is transported in the tube drier, it is heated with the heater that feeds superheated steam;
(4) the described tube drier of rotation and to its input air-flow is taken away with the steam that dust and coal grain heating back is produced;
(5) the coal grain that comes out from described tube drier directly is collected and for using;
(6) will import dust and the steam input dust treatment system that air-flow is taken out of.
2. drying process according to claim 1 is characterized in that: described coal is brown coal.
3. drying process according to claim 1 is characterized in that: also further comprises the coal grain after the fragmentation through conveyor delivery to a coal bunker in that step (3) is preceding, and the step from weighing according to the requirement of inlet amount earlier before this coal bunker enters drier.
4. drying process according to claim 1 is characterized in that: the tube drier rotating speed is 5～10r/min in the described step (4).
5. drying process according to claim 1 is characterized in that: the coal particle size in the described step (2) after the fragmentation is at 5～8mm.
6. drying process according to claim 1 is characterized in that: the superheated steam pressure that described step (3) feeds is 0.01～0.5MPa, and vapor (steam) temperature is 130～175 ℃.
7. drying process according to claim 1, it is characterized in that: comprise fiber bag precipitator, exhaust blower and low-pressure nitrogen blowback system in described dust treatment system, be blown in the fiber bag precipitator as reverse gas cleaning gas with low-pressure nitrogen, and the gas of described fiber bag precipitator discharged with exhaust blower.
8. drying process according to claim 7 is characterized in that: described sack cleaner mesolow nitrogen pressure is 0.1～1MPa, 20～50 ℃ of temperature.
9. drying process according to claim 1 is characterized in that: described input air-flow is an air.
10. drying process according to claim 1 is characterized in that: described input air-flow is a nitrogen.
11. drying process according to claim 1 is characterized in that: the water content of pre-dried coal cinder is not higher than 35wt% in the described step (1).
12. a coal grain drying equipment comprises:
Be used to carry the conveyer of predrying coal cinder;
The predrying coal cinder that described conveyor delivery is come carries out broken disintegrating machine, makes coal particle size after the fragmentation between 3 to 10mm;
Tube drier, the axle of this tube drier are equipped with the heater that feeds superheated steam and heat the coal grain that is transported in the described tube drier with respect to horizontal tilt in it;
Rotate the drive unit of described tube drier;
The dust treatment system; It is characterized in that also comprising:
To the device of described tube drier input air-flow, take described dust treatment system to steam with dust and coal grain heating back generation;
The device of the readymade coal grain that collection is directly come out from described tube drier.
13. drying device according to claim 12 is characterized in that: described coal is brown coal.
14. drying equipment according to claim 12 is characterized in that: described tube drier axioversion degree is 0～30 °, and wherein coal grain input is higher than output.
15. drying equipment according to claim 14 is characterized in that: described tube drier axioversion degree is 5～10 °
16. drying device according to claim 12 is characterized in that: the device of weighing according to the requirement of inlet amount earlier before also comprising the coal bunker that stores the coal grain after the fragmentation and entering described tube drier from coal grain storehouse.
17. drying device according to claim 12 is characterized in that: described tube drier rotating speed is 5～10r/min.
18. drying device according to claim 12 is characterized in that: the coal particle size after the described fragmentation is at 5～8mm.
19. drying device according to claim 12 is characterized in that: described gathering-device is an embedded scraper transporter.
20. drying device according to claim 12, it is characterized in that: described dust treatment system comprises fiber bag precipitator, exhaust blower and low-pressure nitrogen blowback system, described low-pressure nitrogen blowback system is blown in the fiber bag precipitator as reverse gas cleaning gas with low-pressure nitrogen, and described exhaust blower is discharged the gas of described fiber bag precipitator.
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| CNB2007101179589A CN100554839C (en) | 2007-06-26 | 2007-06-26 | Coal granule drying process and equipment |
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| CNB2007101179589A CN100554839C (en) | 2007-06-26 | 2007-06-26 | Coal granule drying process and equipment |
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| CN101126592A true CN101126592A (en) | 2008-02-20 |
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