CN103047844B - Tower type low-rank coal multiple microwave drying device - Google Patents
Tower type low-rank coal multiple microwave drying device Download PDFInfo
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- CN103047844B CN103047844B CN201110308245.7A CN201110308245A CN103047844B CN 103047844 B CN103047844 B CN 103047844B CN 201110308245 A CN201110308245 A CN 201110308245A CN 103047844 B CN103047844 B CN 103047844B
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Abstract
The invention relates to a tower type low-rank coal multiple microwave drying device and belongs to the field of drying devices. The technical scheme is that the tower type low-rank coal multiple microwave drying device is of a vertical tower type structure, the middle of the drying device is provided with a hollow microwave drying cavity from top to bottom, a feeding hopper is arranged at the top end of the microwave drying cavity, a buffering dust-removing bin is arranged at the bottom of the microwave drying cavity, an output device is arranged below the buffering dust-removing bin, a vapor recycling pipe is arranged on one side of the microwave drying cavity, microwave drying assembly systems are arranged on other remaining sides of the microwave drying cavity, the vapor recycling pipe is communicated with the inside of the microwave drying cavity through a movable partition plate, and the upper end and the lower end of the microwave drying cavity are provided with a feeding valve and a discharging valve respectively. The tower type low-rank coal multiple microwave drying device has the advantages of being low in energy consumption, performing drying thoroughly, and being simple to control, small in occupied area, simple to maintain and low in running cost.
Description
Technical field
The invention belongs to drying device field, be specifically related to a kind of tower-type low-rank coal multiple microwave drying equipment.
Background technology
So-called low-order coal refers to low rotten, younger coal.Mainly comprise the coals such as brown coal, dross coal, jet coal, weakly caking coal, its main feature is moisture high (20% ~ 60%), calorific value low (1000 ~ 3500Kcal/kg), this brings difficulty to the utilization of low-order coal and transport, must carry out drying and upgrading before therefore using to it.
The outer representational coal upgrading technology of Present Domestic mainly contains following several large class:
1, hot-blast stove, heat smoke direct drying method.
2, steam directly, contact drying method.
3, micro-wave drying method.
4, pyrolysis upgrading method.
Hot-blast stove, heat smoke direct drying method and steam directly, contact drying method mainly by different heat carriers by the outer water extraction in coal out, the general thermal efficiency is within 85%, dried moisture general at 3-15%, do not carry out chemical reaction, coal chemistry characteristic does not change.Pyrolysis (destructive distillation) upgrading refer under isolated air (or at nonoxidizing atmosphere) condition by coal heat, finally obtain the processing method of coal gas, tar and semicoke.It is the course of reaction that physics adds chemistry, comprises gas heat carrier method pyrolysis upgrading, solid heat carrier method pyrolysis pyrolysis (destructive distillation) upgrading and other special method for pyrolysis upgrading.Also has non-evaporation drying technique in addition, as technology such as Thermal dehydration, mechanical thermal extrusion dehydration, dehydration of organic solvent.
Though these drying processes serve good drying purpose above, but described prior art ubiquity disposal ability is little, drying effect is poor, dry after easily get damp water suction, dry run easy firing of low-order coal explode, the problem such as seriously polluted, be difficult to reach current environmental requirement both domestic and external, therefore urgently prior art is improved, to improve the drying capacity of equipment, and the safe and reliable and environmental requirement in production process can be met.
Summary of the invention
The object of the invention is to improve prior art, provide one to have energy consumption low, thoroughly dry, control simple, floor space is few, safeguards simple, the tower-type low-rank coal multiple microwave drying equipment that operating cost is low.
For achieving the above object, the present invention is achieved in the following ways:
I.e. a kind of tower-type low-rank coal multiple microwave drying equipment, this technical essential is that this equipment adopts vertical tower structure, be the microwave drying chamber of hollow from top to bottom in the middle part of it, top, microwave drying chamber arranges feed hopper, buffering dust elimination storehouse is set bottom microwave drying chamber, the below in buffering dust elimination storehouse arranges output device, in the wherein side in microwave drying chamber, steam recovery channel is set, all the other each sides arrange microwave drying component system, this steam recovery channel is by active clapboard and microwave drying chamber internal run-through, microwave drying chamber upper, lower two ends arrange pan feeding valve and discharge gate respectively.
In order to improve the drying effect of equipment, described microwave drying chamber arranges separate high, medium and low three groups of different capacity microwave drying component systems from top to bottom respectively.
Described active clapboard is evenly covered with through hole.
Reduce the impact to conveying device when falling to make the low-order coal of drying, the operation stability of support equipment, in 30 ~ 120 angles between buffering dust elimination storehouse and microwave drying chamber.
In addition, the outer setting of described steam recovery channel observes maintenance window, so that observe machine operation and overhaul.
After tool of the present invention adopts said structure, freely falling body principle and microwave technology are combined and is incorporated in low-order coal drying process, utilize the moisture in the principle removing low-order coal of heating using microwave, other impurity such as sulphur, phosphorus, and utilize freely falling body principle as the main mode of movement of coal dry run, thus save the conveying equipment of dry run, the construction cost of minimizing equipment and operating cost, there is energy consumption low, thoroughly dry, control simple, floor space is few, safeguard simple, the advantage that operating cost is low.
Accompanying drawing explanation
Accompanying drawing 1 is structural representation of the present invention
Accompanying drawing 2 is microwave drying component system sectional views
1 feed hopper; 2 pan feeding valves; 3 steam recovery channels; 4 observe maintenance window; 5 active clapboards; 6 microwave drying chambeies; 7 microwave drying component systems; 8 discharge gates; 9, dust elimination storehouse is cushioned; 10 conveying devices.
Specific embodiments
As Fig. 1, shown in Fig. 2, this tower-type low-rank coal multiple microwave drying equipment, this technical essential is that this equipment adopts vertical tower structure, be the microwave drying chamber 6 of hollow from top to bottom in the middle part of it, top, microwave drying chamber 6 arranges feed hopper 1, buffering dust elimination storehouse 9 is set bottom microwave drying chamber 6, the below in buffering dust elimination storehouse 9 arranges output device, in the wherein side in microwave drying chamber 6, steam recovery channel 3 is set, all the other each sides arrange microwave drying component system, this steam recovery channel 3 is by active clapboard 5 and microwave drying chamber 6 internal run-through, microwave drying chamber 6 upper, lower two ends arrange pan feeding valve 2 and discharge gate respectively.
In order to improve the drying effect of equipment, described microwave drying chamber 6 arranges separate high, medium and low three groups of different capacity microwave drying component systems from top to bottom respectively.
Described active clapboard 5 is evenly covered with through hole.
Reduce the impact to conveying device when falling to make the low-order coal of drying, the operation stability of support equipment, in 30 ~ 120 angles between buffering dust elimination storehouse 9 and microwave drying chamber 6.
In addition, the outer setting of described steam recovery channel 3 observes maintenance window 4, so that observe machine operation and overhaul.
The operation principle of this equipment is:
Microwave be frequency at the electric wave of 300 megahertzes to 300 gigahertzs, that we add heat utilization is 2450MHz and 915MHz.Dielectric material is made up of polar molecule and nonpolar molecule, and under electromagnetic field effect, these polar molecules are from the polar alignment orientation of original random distribution state shift according to electric field.And under high-frequency electromagnetic field action, these orientations constantly change by the frequency of alternating electromagnetism, this process causes the motion of molecule and phase mutual friction thus produces heat.Now the field energy of alternating electric field is converted into the heat energy in medium, and medium temperature is constantly raised.Hydrone in coal is polar molecule.It is under fast-changing high frequency points magnetic fields, change along with external electric field changes by its polarity orientation, and cause the effect of the mutual fricting movement of hydrone, now the field energy of microwave field is converted into the heat energy of hydrone, make its volatilization of being heated, thus reach the object of heat drying.
This technology is compared with routine techniques, because conventional heating (as flame, hot blast, electric heating, steam etc.) is all the surface utilizing heat transfer, convection current, heat radiation first heat to be passed to heating object, then central temperature is progressively made to raise (i.e. the external heat of normal title) by heat transfer.The temperature that it will make centre reach required, needs certain heat conduction time, and just longer to the time needed for the object of heat transfer rate variance; Heating using microwave then belongs to inner mode of heating, electromagnetic energy directly acts on medium molecule and converts heat to, and transmission performance makes material inside and outside medium be heated simultaneously, do not need heat transfer, and the inner radiating condition that lacks, cause internal temperature higher than the temperature gradient distribution of outside, formed and drive internal moisture to the steam pressure difference of surface penetration, accelerate the migration evaporation rate of moisture content.Particularly to the coal of water content below 30%, speed can the shortening of hundreds of times, reaches even drying at short notice.
Microwave drying security is better, baking temperature can be controlled in less than 90 DEG C, burning or explosion accident can not occur, drying efficiency high (efficiency of heating surface of microwave energy to water is high), can be evenly dry within the scope of granularity 0 ~ 50mm, technology maturation, technology controlling and process is simple, can realize automated production, production capacity flexible design (wall scroll production line 20 tons/hour), product can reduce sulphur, phosphorus equal size, and the water that drying goes out is recyclable, to water-deficient area advantageously.
The main distinction of microwave drying and other drying means is: microwave drying can be removed Free water and the water contained by coal inside and can not damage the intrinsic property of coal, and the process control parameters of microwave drying is simultaneously simple, is easier to carry out accurate humidity control.On the whole, utilize micro-wave drying method to brown coal carry out dehydration upgrading possess skills advanced person, process efficient feature, be the optimal selection of client.
The all right desulfurization of microwave, sulphur coal is under the electromagnetic field effect of microwave frequency, and sulfide linkage (Fe-S or C-S) optionally absorbs large energy and produces highly active sulphur, but microwave energy can not heat ature of coal itself.Therefore can not destroy ature of coal again can at the chien shih sulfur bonds of 50-150 DEG C.The free sulphur generated can react with the hydrogen in coal, oxygen, generates the gases such as H2S, SO2 or COS, separates out from coal.The microwave frequency of a certain feature is selected to be the key of desulfurization.Experimentally result, when frequency is between 8.35-8.40 kilohertz, ature of coal and microwave action are comparatively strong.Not only can remove pyritic sulfur, also can remove organic sulfur, organic sulfur is at high temperature decomposed into the volatile sulfur compoundses such as H2S and is separated with coal.Desulfurization degree almost can reach 100%.
The present invention operationally, by control device, microwave drying chamber discharge gate 8 is closed, microwave drying chamber pan feeding valve 2 is opened, in feed hopper 1, the coal of deposit falls under gravity in microwave drying chamber 6, after the full coal in microwave drying chamber 6, pan feeding valve 2 is closed, microwave drying component system 7 is started working, microwave electromagnetic field is formed in microwave drying chamber 6, moisture in coal heats rapidly volatilization and forms steam under the effect of microwave electromagnetic field, the steam formed in microwave drying chamber 6 and high temperature increase the air pressure in microwave drying chamber 6, height draught head is formed by the air pressure in the hole on dividing plate 5 and steam recovery channel 3, under differential pressure action, steam in microwave drying chamber 6 enters after in steam recovery channel 3 and discharges, after coal drying completes, microwave drying component system 7 quits work, microwave drying chamber discharge gate 8 is opened, dried coal is fallen in buffering dust elimination storehouse 9 and be admitted to next procedure by conveying device 10 after dust elimination.A part of steam in steam recovery channel 3 can be condensed into aqueous water and fall the bottom discharge of steam recovery channel 3, and the gas in steam recovery channel 3 exports through steam recovery channel 3 and discharges, simultaneously formation negative pressure in pipe.
The present invention arranges height from top to bottom respectively due to complete equipment microwave drying chamber 6, in, the microwave drying component system of low three groups of different capacities, the operation that whole equipment is more continuous and level and smooth can be made, because three part microwave drying component systems can work alone, so when wherein one group of microwave drying component system breaks down or needs to safeguard, its pan feeding valve 2 will be closed, stop this microwave drying chamber 6 charging, other two groups then can not be affected and still work on, so just in non-stop-machine situation, diagnosis and repair maintenance can be carried out to equipment, thus significantly can improve the utilization of capacity of equipment.
Native system due to have employed observe maintenance window 4 and active clapboard 5 design, therefore easily can open observation maintenance window 4 to clear up, thus significantly increase work efficiency, the moisture that coal evaporates in microwave drying chamber can enter steam recovery channel 3 by the aperture on dividing plate; The size of aperture through tightly calculating, also has shielding action to microwave according to microwave wavelength, and microwave can not be revealed by aperture, has also ensured the safety of operating personnel.
After tool of the present invention adopts said structure, freely falling body principle and microwave technology are combined and is incorporated in low-order coal drying process, utilize the moisture in the principle removing low-order coal of heating using microwave, other impurity such as sulphur, phosphorus, and utilize freely falling body principle as the main mode of movement of coal dry run, thus save the conveying equipment of dry run, the construction cost of minimizing equipment and operating cost, there is energy consumption low, thoroughly dry, control simple, floor space is few, safeguard simple, the advantage that operating cost is low.
Claims (4)
1. a tower-type low-rank coal multiple microwave drying equipment, be characterised in that this equipment adopts vertical tower structure, be the microwave drying chamber of hollow from top to bottom in the middle part of it, top, microwave drying chamber arranges feed hopper, buffering dust elimination storehouse is set bottom microwave drying chamber, the below in buffering dust elimination storehouse arranges output device, in the wherein side in microwave drying chamber, steam recovery channel is set, all the other each sides arrange microwave drying component system, this steam recovery channel is by active clapboard and microwave drying chamber internal run-through, active clapboard is evenly covered with through hole, microwave drying chamber upper, lower two ends arrange pan feeding valve and discharge gate respectively.
2. tower-type low-rank coal multiple microwave drying equipment according to claim 1, is characterized in that microwave drying chamber arranges separate high, medium and low three groups of different capacity microwave drying component systems from top to bottom respectively.
3. tower-type low-rank coal multiple microwave drying equipment according to claim 1, is characterized in that between buffering dust elimination storehouse and microwave drying chamber in 30 ~ 120 angles.
4. tower-type low-rank coal multiple microwave drying equipment according to claim 1, is characterized in that the outer setting of steam recovery channel observes maintenance window.
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| CN202304307U (en) * | 2011-10-12 | 2012-07-04 | 山东博润工业技术有限公司 | Tower-type low-rank coal multiple microwave drying equipment |
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| US4015341A (en) * | 1975-12-22 | 1977-04-05 | Mcdonnell Douglas Corporation | Seed drying process and apparatus |
| RU2326311C2 (en) * | 2003-10-29 | 2008-06-10 | Общество с ограниченной ответственностью Производственное предприятие "СпецАгроКомплект" | Method of grain drying and grain dryer |
| US7666235B2 (en) * | 2005-11-30 | 2010-02-23 | Industrial Microwave Systems, L.L.C. | Microwave drying of coal |
| CN2847184Y (en) * | 2005-12-23 | 2006-12-13 | 昆明理工大学 | Multiple point dispersion type microwave drying device |
| CN201032338Y (en) * | 2007-04-30 | 2008-03-05 | 张井猛 | Vertical type drying kiln |
| CN101706196A (en) * | 2009-10-12 | 2010-05-12 | 郑州拉姆顿清洁能源工程技术有限公司 | Oxygen-free drying and upgrading system of lignite and lignite drying process |
| CN201882656U (en) * | 2010-12-21 | 2011-06-29 | 安徽六国化工股份有限公司 | Return and aggregate conveyer |
| CN102207350B (en) * | 2011-05-19 | 2013-05-01 | 广东科达机电股份有限公司 | Method for carrying out fluidized drying on lignite by microwaves |
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Effective date of registration: 20191223 Address after: 2415-1, block a, advanced ceramics industrial park, No. 125, Liuquan Road, high tech Zone, Zibo City, Shandong Province Patentee after: Bertley (Shandong) Industrial Equipment Co., Ltd Address before: 255086 Shandong province Zibo City Yumin Road hi tech Development Zone No. 169 Patentee before: Shandong Borun Process Industrial Technology Corp., Ltd. |