CN102207350B - Method for carrying out fluidized drying on lignite by microwaves - Google Patents

Method for carrying out fluidized drying on lignite by microwaves Download PDF

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Publication number
CN102207350B
CN102207350B CN 201110130476 CN201110130476A CN102207350B CN 102207350 B CN102207350 B CN 102207350B CN 201110130476 CN201110130476 CN 201110130476 CN 201110130476 A CN201110130476 A CN 201110130476A CN 102207350 B CN102207350 B CN 102207350B
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microwave
brown coal
raw
drying
hot blast
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CN 201110130476
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CN102207350A (en
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彭虎
夏广斌
高泽斌
刘忠
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Keda Clean Energy Co Ltd
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Keda Industrial Co Ltd
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Abstract

The invention discloses a method for carrying out fluidized drying on lignite by microwaves. The method comprises the steps of: pre-drying crude lignite by a microwave device with hot air, and then carrying out fluidized drying on the lignite by a fluidizing bed with hot air so that the free water content in the crude lignite is lower than 1 percent. By utilizing the method disclosed by the invention, large-scale, rapid, low-energy-consumption and deep drying production of lignite can be realized.

Description

A kind of method of microwave fluidized drying brown coal
Technical field
The invention belongs to the brown coal drying field, particularly a kind of method of microwave fluidized drying brown coal.
Background technology
International geologist's prediction: about 6,000,000,000,000 tons of whole world hard coal oil in place, about 4,000,000,000,000 tons of brown coal oil in place.China's brown coal reserves account for 16% of world's brown coal gross reserves, are main coal resources a kind of of China.
Brown coal are grizzles of the brownish black of a kind of degree of coalification between peat and pitch coal, and total moisture content generally can reach 20~50%, cracked, the easy oxidation and spontaneous combustion of easy-weathering, and quality is unstable.Generally adopt at present the predrying or steam drying process of flue gas that brown coal are carried out drying abroad, then directly deliver near coal-mine power plant and be used for combustion power generation, the near coal-mine power plant of China quantity is few, and most of power plant is away from the colliery, and transportation range is far away.If without drying, then be unfavorable for transportation, store, also be difficult to satisfy each user's quality requirement.
Wan Yongzhou etc. have introduced the drying brown coal technology such as the hot method of employing rotary pipe type, steam fluid bed, hot dewatering process/method the 91st~92 page of " coal engineering " the 8th phase in 2008; Patent CN10132626 discloses " microwave drying of coal ": behind coal grading, be loaded into the dry coal of water content within target water content that obtain in two-stage or the multistage microwave office by conveyer, the method exists the moisture that evaporates in the dry run to be difficult to take out of rapidly, and because the degree of depth of the moisture brown coal of microwave penetration is limited, can not increase the thickness in coal seam and realize large batch of drying, and difficult uniformity and the dry degree of depth that guarantees drying, easily cause the coking quality of burning and reduction coal, the pore of coal is opened and does not carry out the effect that depth drying does not reach upgrading in the microwave drying process, makes on the contrary the easy suction of hydrophily enhancing of coal be unfavorable for storage.
More than known technical scheme have all that apparatus and process is complicated, drying efficiency is low, energy consumption is high, can not depth drying etc. such or such problem, cause the brown coal drying production that is difficult to realize large-scale.
Summary of the invention
The objective of the invention is to overcome the defective of prior art, a kind of method of microwave fluidized drying brown coal be provided, realize the brown coal scale fast, the drying production of low energy consumption, the degree of depth.
The method of microwave fluidized drying brown coal provided by the invention comprises and the raw material brown coal is carried out first predrying through the microwave device that is connected with hot blast, carries out fluidized drying through the fluidized bed plant that is connected with hot blast again, makes that free water content reaches below 1% in the raw material brown coal.
Further method is:
Described raw material brown coal through microwave device, enter fluidized bed plant with the conveying device along continuous straight runs again, perhaps along vertical downward direction process microwave device, enter fluidized bed plant again;
Described raw material brown coal are stirred by agitating device in the horizontal feed process of conveying device, perhaps in course of conveying vertically downward by the distribution device cloth, stirred by agitating device;
Hot blast in the described microwave device is to be provided by fluidized bed plant, is perhaps provided by hot air apparatus and two kinds of approach of fluidized bed plant, and the hot blast temperature in the microwave device is 80~110 ℃;
Hot blast flow direction in the described microwave device and the throughput direction of raw material brown coal are reciprocal;
Hot blast in the described fluidized bed plant is to be provided by hot air apparatus, and the hot blast temperature that hot air apparatus provides is 160~220 ℃, and oxygen content is below 20%;
The dew point that the temperature of hot blast in the described microwave device in the microwave device exit is higher than steam is more than 5 ℃, and it is recycling to return described hot air apparatus after gas solid separation and processed;
Described raw material brown coal refer to the brown coal of water content more than 20%, below the granularity 10mm;
Described predrying referring to makes its free water content be down to below 5% after the microwave device drying in the raw material brown coal of water content more than 20%.
Beneficial effect of the present invention: first, the method of microwave fluidized bed drying brown coal, heating using microwave raw material brown coal, hot blast and material form countercurrent flow mutually, and baking temperature is low, and capacity usage ratio is high, having solved conventional method need to provide the overheated steam drying and cause the problem that energy resource consumption is high, the mobile moisture that raw material brown coal in microwave drying produced of hot blast in microwave device is in time taken microwave device out of, has avoided steam again to condense in device, has improved drying efficiency; And solved the problem that the microwave drying brown coal are prone to sparking and burn.Second, conveying device drives the raw material brown coal and passes through microwave device, raw material brown coal on the conveying device are disperseed agitating device and stirring action has solved the inadequate problem of traditional microwave drying brown coal penetration depth, and solved raw material brown coal temperature equally distributed problem in microwave environment.The 3rd, during microwave-hot air drying, raw material brown coal internal moisture is from inside to outside evaporated, and occurs a large amount of pores in the particle, when it is in the air ambient, and the easy moisture in the absorbing air and its water content is raise again.The raw material brown coal enter fluid bed through microwave-hot air drying after to a certain degree again and carry out fluidized drying, pass into the hot blast more than 160~200 ℃ during fluidized drying, raw material brown coal inside begins to have tar to separate out fast under this temperature, because of rate of drying fast, the raw material brown coal stop the several seconds in fluid bed, coal tar can not taken out of by hot blast, condense in the raw material brown coal cooling procedure, stop up the pore of brown coal, make it change hydrophobicity into from hydrophily, reach the effect of upgrading, solved the problem that traditional fluid bed can not depth drying.Hot air fluidized drying is large because of its gas-solid contact area, and the moisture evaporation rate is fast, can be with brown coal drying within the several seconds, and dried raw material brown coal are discharged from fluid bed, have avoided heat to concentrate and have caused burning and blast.The 4th, the dispersion during microwave-hot air drying and whipping process are so that the microwave penetration bed depth increases, and drying efficiency improves, and is conducive to large-scale production, reduces equipment investment.The 5th, in the microwave-hot air drying since the water vapour that passes into and produce when dry of hot blast mix, the difficult problem that be full of and flow when having solved pure microwave drying easily cause burning and reduce the coking quality of coal of the hot blast of this moisture vapor in microwave device, equipment is safe and reliable to operation.The 6th, the method technological process is short, and system moves under the closed circulation environment, has reduced environmental pollution.
Below in conjunction with accompanying drawing the inventive method is described further.
Description of drawings
Fig. 1 is the device schematic diagram that adopts among the inventive method embodiment 1.
Fig. 2 is the agitating device schematic diagram in the device shown in Fig. 1.
Fig. 3 is the device schematic diagram that adopts among the inventive method embodiment 2.
Fig. 4 is the device schematic diagram that adopts among the inventive method embodiment 3.
The specific embodiment
Embodiment 1
The inventive method is the raw material brown coal to be carried out first predrying through the microwave device of logical hot blast with the conveying device along continuous straight runs, and the fluidized bed plant through logical hot blast carries out fluidized drying again, and raw material brown coal free water content is reached below 1%.
The device that the inventive method adopts is horizontal, and as shown in Figure 1, solid arrow is the direction of motion of raw material brown coal among the figure, and dotted arrow is the direction of motion of hot blast.The raw material brown coal are generally moisture brown coal more than 20%, below the granularity 10mm.The raw material brown coal are joined on the horizontal track conveying device 7 in the microwave device 5 through planet batcher 2 by the loading hopper 1 of device, the raw material brown coal on horizontal track conveying device 7 along continuous straight runs when the microwave device, it is heated predrying by microwave source 4, constantly stir to improve heating effect by rake shape agitating device 10 simultaneously, agitating device 10 as shown in Figure 2, comprise rotating shaft 101 and the harrow nail 102 that is fixed in the rotating shaft 101, the raw material brown coal enter the charging aperture 13 of fluid bed 15 through planet batcher 12 at the port of export 11 of microwave device 5.Air blast 17 is with (160 ℃~220 ℃ of the hot blasts of hot-blast stove 16, oxygen content is below 20%) pressurization after send in the fluid bed 15, after evenly distributing, air distribution plate 20 enters the fluosolids on top, hot blast drives the raw material brown coal and is fluidized state, carry out depth drying, the moisture in the raw material brown coal further breaks away from.Hot blast in the fluid bed 5 from it hot-blast outlet 21 of section enters the tail end air inlet 6 of microwave device 5, flow from back to front, simultaneously with horizontal track conveying device 7 on the raw material brown coal mutually form adverse current, and carry out heat exchange with the raw material brown coal that constantly are stirred, further predrying raw material brown coal, reduce simultaneously hot blast temperature, the hot blast temperature in the microwave device 5 remains on 80~110 ℃; Raw material brown coal in the microwave device 5 are added thermogenetic moisture by microwave source 4 and are discharged through exhaust outlet 3 by reverse hot blast simultaneously; The hot blast temperature at exhaust outlet 3 places is higher than the dew point of steam more than 5 ℃, and the raw material brown coal are interior after microwave and hot blast Hybrid Heating drying at microwave device 5, and its free water content is down to and is entered fluid bed 15 below 5%.
The raw material brown coal after the fluidisation heated-air drying, make that free water content reaches below 1% in the raw material brown coal in fluid bed, be graininess and overflow from discharging port of fluidized bed 14 and enter finished product coal bunker 22.
The gas of discharging from exhaust outlet 3 enters circulation of tail gas treatment system 19, and after conventional technology gas solid separation and dehydration, gas enters hot-blast stove 16, waste heat recovery through gas-separating valve 18, air blast 17 circulations; Enter finished product coal bunker 22 from the 19 isolated solids recovery of circulation of tail gas treatment system.
Embodiment 2
Fluidization drying device among the embodiment 1 also can adopt horizontal type fluidized-bed, as shown in Figure 3, after feed coal enters the charging aperture 13 of fluid bed 15 by the port of export 11 of microwave device 5 through planet batcher 12, air blast 17 is with (160 ℃~220 ℃ of the hot blasts of hot-blast stove 16, oxygen content is below 20%) pressurization after send in the fluid bed 15, be provided with some horizontally disposed fluidising chamber 25 and corresponding air intake arms 24 by dividing plate 23 separations in the fluid bed 15, hot blast is fluidized state through air intake arm 24 and air distribution plate 20 even distribution rear drive raw material brown coal, and shift to step by step the fluidising chamber 25 of discharge end by dividing plate 23 by the fluidising chamber 25 of feed end, be graininess and overflow from discharging port of fluidized bed 14 and enter finished product coal bunker 22.Hot blast in the fluid bed 15 from it hot-blast outlet 21 of section enters the tail end air inlet 6 of microwave device 5.
Embodiment 3
Another kind of method of the present invention is the raw material brown coal to be carried out first predrying through the microwave device that is connected with hot blast along vertical downward direction, carries out fluidized drying through the fluidized bed plant that is connected with hot blast again, and raw material brown coal free water content is down to below 1%.
The device that the inventive method adopts is vertical, and as shown in Figure 4, solid arrow is the direction of motion of raw material brown coal among the figure, and dotted arrow is the direction of motion of hot blast.The raw material brown coal are generally moisture brown coal more than 20%, below the granularity 10mm.The raw material brown coal add microwave device 14 ' from charge door 1 ', rotating shaft 17 ' uniform rotation under the driving of motor of conveying device, drive simultaneously rake shape mixing component 2 ' fixed thereon and the 15 ' uniform rotation of taper material guiding plate, the raw material brown coal from top to bottom are evenly distributed on metal baffles 11 ' that are located at microwave device 14 ' inboards through taper material guiding plate 15 ', rake shape mixing component 2 ' that are arranged on each layer metal baffles 11 ' will fall into the raw material brown coal of metal baffles 11 ' by export-oriented center raking at rotation process, fall into step by step and pass through taper material guiding plate 15 ' and metal baffles 11 ', make material be " S " type and move from top to bottom, the raw material brown coal heat predrying by microwave source 3 ' in microwave device 14 ' to it; (160 ℃~220 ℃ of the hot blasts of hot-blast stove 8 ', oxygen content is below 20%) minute two-way enters respectively air inlet 18 ' of bottom and the microwave device 14 ' bottoms of fluid bed 5 ' after air blast 9 ' pressurization, and hot blast enters the fluosolids on top after air distribution plate 12 ' evenly distribute in fluid bed 5 '; Hot blast enters microwave device 14 ' from material hole 4 ', operation from bottom to top, mutually form adverse current with material, carry out heat exchange with the raw material brown coal of continuous adding, further predrying material, hot blast temperature in microwave device 14 ' remains on 80~110 ℃, and the hot blast temperature that passes among fluid bed 5 ' is 160~220 ℃, and oxygen content is below 20%; In microwave device 14 ', under microwave source 3 ' irradiation, moisture breaks away from fast in the material, the hot blast that is moved is from bottom to top taken out of, the hot blast temperature at exhaust outlet 10 ' places is higher than the dew point of steam more than 5 ℃, the raw material brown coal are after microwave and hot blast Hybrid Heating drying in microwave device, and free water content is reduced to 5% and falls into fluid bed 5 ' by material hole 4 '.
After hot air fluidized drying, be down to and be graininess below 1% and overflow from discharging port of fluidized bed 6 ' and enter finished product coal bunker 13 ' by free water content in fluid bed for the raw material brown coal.
The gas of discharging from exhaust outlet 10 ' enters circulation of tail gas treatment system 7 ', and after conventional technology gas solid separation, gas enters hot-blast stove 8 ', waste heat recovery through gas-separating valve 16 ', air blast 9 ' circulation; Enter finished product coal bunker 13 ' from the isolated solid recovery of circulation of tail gas treatment system 7 '.

Claims (4)

1. the method for microwave fluidized drying brown coal is characterized in that the raw material brown coal are carried out through the microwave device of logical hot blast first predrying, and the fluidized bed plant through logical hot blast carries out fluidized drying again, makes that free water content reaches below 1% in the raw material brown coal; Described raw material brown coal are carried through microwave device with the conveying device along continuous straight runs, enter fluidized bed plant again, and are stirred by agitating device in the horizontal feed process; Perhaps carry through microwave device along vertical downward direction, enter again fluidized bed plant, in course of conveying vertically downward, by the distribution device cloth, and stirred by agitating device; Hot blast in the described microwave device is to be provided by fluidized bed plant, is perhaps provided by hot air apparatus and two kinds of approach of fluidized bed plant, and the hot blast temperature in the microwave device is 80~110 ℃; Hot blast in the described fluidized bed plant is to be provided by hot air apparatus; The hot blast temperature that hot air apparatus provides is 160~220 ℃, and oxygen content is below 20%; Described predrying referring to makes its free water content be down to 5% after the microwave device drying in the raw material brown coal of water content more than 20%.
2. the method for microwave fluidized drying brown coal according to claim 1 is characterized in that the throughput direction of hot blast flow direction in the described microwave device and raw material brown coal is reciprocal.
3. the method for microwave fluidized drying brown coal according to claim 2, it is characterized in that dew point that the temperature of hot blast in the microwave device exit in the described microwave device be higher than steam more than 5 ℃, it is recycling to return described hot air apparatus after gas solid separation and processed.
4. the method for the described microwave fluidized drying of arbitrary claim brown coal in 3 according to claim 1 is characterized in that described raw material brown coal refer to water content more than 20%, the following brown coal of granularity 10mm.
CN 201110130476 2011-05-19 2011-05-19 Method for carrying out fluidized drying on lignite by microwaves Expired - Fee Related CN102207350B (en)

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CN105157399A (en) * 2015-08-18 2015-12-16 山东大学 Segmented water removing and drying system for high-humidity coal and application method for segmented water removing and drying system

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CN102393132A (en) * 2011-11-14 2012-03-28 山东博润工业技术有限公司 Vertical microwave drying coal furnace
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CN102650494B (en) * 2012-05-21 2014-08-13 山东天力干燥股份有限公司 Device and technology for drying lignite by jointly using superheated steam and high frequency
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WO2016037379A1 (en) * 2014-09-12 2016-03-17 呼伦贝尔弘毅煤炭科技发展有限公司 Method and apparatus for drying lignite and improving quality of lignite
CN104194856A (en) * 2014-09-12 2014-12-10 呼伦贝尔弘毅煤炭科技发展有限公司 Method and device for drying lignite and improving quality of lignite
CN104677054B (en) * 2015-02-11 2017-06-06 沈阳师范大学 It is inverted the low temperature fluidized bed drying equipment of microwave
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