CN103047844A - 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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- CN103047844A CN103047844A CN2011103082457A CN201110308245A CN103047844A CN 103047844 A CN103047844 A CN 103047844A CN 2011103082457 A CN2011103082457 A CN 2011103082457A CN 201110308245 A CN201110308245 A CN 201110308245A CN 103047844 A CN103047844 A CN 103047844A
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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 is low, and (1000～3500Kcal/kg), this utilization and transportation to low-order coal has brought difficulty, must carry out drying and upgrading to it before therefore using.
The outer representational coal upgrading technology of Present Domestic mainly contains following several large class:
1, hot-blast stove, hot flue gas direct drying method.
2, steam directly, the contact drying method.
3, micro-wave drying method.
4, pyrolysis upgrading method.
Hot-blast stove, hot flue gas direct drying method and steam are direct, the contact drying method mainly is by different heat carriers with the outer water extraction in the coal out, the general thermal efficiency is in 85%, dried moisture generally at 3-15%, do not carry out chemical reaction, the coal chemistry characteristic does not change.Pyrolysis (destructive distillation) upgrading refers under secluding air (or at nonoxidizing atmosphere) condition coal be heated, and finally obtains 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 in addition non-evaporation drying technique, such as technology such as heating power dehydration, mechanical thermal extrusion dehydration, dehydration of organic solvent.
Though above these drying processes have played preferably drying purpose, but described prior art ubiquity disposal ability little, drying effect is poor, do after easily get damp suction, dry run easy firing of low-order coal explode, the problem such as seriously polluted, be difficult to reach present environmental requirement both domestic and external, therefore demand urgently prior art is improved, improving the drying capacity of equipment, and can satisfy the safe and reliable and environmental requirement in the production process.
Summary of the invention
The object of the invention is to prior art is improved, provide that a kind of to have energy consumption low, thoroughly dry, control is simple, and floor space is few, safeguard 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:
It is a kind of tower-type low-rank coal multiple microwave drying equipment, the present technique main points are that this equipment adopts the vertical tower structure, its middle part is the microwave drying chamber of hollow from top to bottom, top, microwave drying chamber arranges feed hopper, bottom, microwave drying chamber arranges buffering dust elimination storehouse, the below in buffering dust elimination storehouse arranges output device, wherein side in the microwave drying chamber arranges the steam recovery channel, all the other each sides arrange the 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 respectively pan feeding valve and discharge gate.
In order to improve the drying effect of equipment, described microwave drying chamber arranges respectively separate high, medium and low three groups of different capacity microwave drying component systems from top to bottom.
Evenly be covered with through hole on the described active clapboard.
Reduce the impact to conveying device when falling for the low-order coal that can make drying, the operation stability of support equipment is 30～120 angles between buffering dust elimination storehouse and the microwave drying chamber.
In addition, the outer setting of described steam recovery channel is observed the maintenance window, so that machine operation is observed and overhauled.
After tool of the present invention adopts said structure, freely falling body principle and microwave technology are combined and are incorporated in the low-order coal drying process, utilize the principle of heating using microwave to remove moisture in the low-order coal, other impurity such as sulphur, phosphorus, and utilize the freely falling body principle as the main mode of movement of coal dry run, thereby save the conveying equipment of dry run, the construction cost of minimizing equipment and operating cost, has energy consumption low, thoroughly dry, control is simple, and floor space is few, safeguard simply the advantage that operating cost is low.
Description of drawings
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 the maintenance window; 5 active clapboards; 6 microwave drying chambeies; 7 microwave drying component systems; 8 discharge gates; 9, buffering dust elimination storehouse; 10 conveying devices.
Specific embodiments
Such as Fig. 1, shown in Figure 2, this tower-type low-rank coal multiple microwave drying equipment, the present technique main points are that this equipment adopts the vertical tower structure, its middle part is the microwave drying chamber 6 of hollow from top to bottom, 6 tops, microwave drying chamber arrange feed hopper 1,6 bottoms, microwave drying chamber arrange buffering dust elimination storehouse 9, the below in buffering dust elimination storehouse 9 arranges output device, wherein side in microwave drying chamber 6 arranges steam recovery channel 3, all the other each sides arrange the microwave drying component system, this steam recovery channel 3 is by active clapboard 5 and microwave drying chamber 6 internal run-throughs, microwave drying chamber 6 upper, lower two ends arrange respectively pan feeding valve 2 and discharge gate.
In order to improve the drying effect of equipment, described microwave drying chamber 6 arranges respectively separate high, medium and low three groups of different capacity microwave drying component systems from top to bottom.
Evenly be covered with through hole on the described active clapboard 5.
Reduce the impact to conveying device when falling for the low-order coal that can make drying, the operation stability of support equipment is 30～120 angles between buffering dust elimination storehouse 9 and the microwave drying chamber 6.
In addition, the outer setting of described steam recovery channel 3 is observed maintenance window 4, so that machine operation is observed and overhauled.
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 comprised of polar molecule and nonpolar molecule, and under electromagnetic field effect, these polar molecules are from the polarity oriented of original random distribution state shift according to electric field.And under the high-frequency electromagnetic field action, these orientations constantly change by frequencies of alternating electromagnetism, thereby this process causes the motion of molecule to produce heat with mutual friction mutually.This moment, the field energy of alternating electric field was converted into the interior heat energy of medium, and medium temperature is constantly raise.Hydrone in the coal is polar molecule.It is under fast-changing high frequency points magnetic fields, its polarity orientation will change along with the variation of external electric field, cause the effect of the mutual fricting movement of hydrone, and the field energy of microwave field is converted into the heat energy of hydrone at this moment, make its volatilization of being heated, thereby reach the purpose of heat drying.
Present technique is compared with routine techniques, because conventional heating (such as flame, hot blast, electric heating, steam etc.) all is to utilize hot conduction, convection current, heat radiation heat at first to be passed to the surface of heating object, progressively make central temperature rising (i.e. the normal external heat that claims) by the heat conduction again.It will make the centre reach required temperature, needs certain heat conduction time, and just longer to the required time of the poor object of pyroconductivity; Heating using microwave then belongs to inner mode of heating, electromagnetic energy directly acts on medium molecule and converts heat to, and transmission performance is heated the material inside and outside medium simultaneously, do not need the heat conduction, and the inner radiating condition that lacks, cause internal temperature to be higher than outside temperature gradient distribution, form and drive internal moisture to the steam pressure difference of surface infiltration, accelerated the migration evaporation rate of moisture content.Particularly to water content at the coal below 30%, the shortening that speed can hundreds of times reaches even drying at short notice.
The microwave drying security is better, baking temperature can be controlled in below 90 ℃, burning or explosion accident can not occur, drying efficiency high (microwave energy is high to the efficiency of heating surface of water), can both be evenly dry in granularity 0～50mm scope, technology maturation, technology controlling and process is simple, can realize automated production, production capacity flexible design (20 tons/hour of wall scroll production lines), product can reduce sulphur, phosphorus equal size, and the water that drying goes out is recyclable, and is comparatively favourable to the water-deficient area.
The main distinction of microwave drying and other drying means is: microwave drying can be removed Free water and the inner contained water of coal and can not be damaged the intrinsic property of coal, and the process control parameters of simultaneously microwave drying is simple, is easier to carry out accurate humidity control.On the whole, utilizing micro-wave drying method to brown coal the possess skills characteristics of advanced person, highly-efficient treatment of upgrading of dewatering, is client's optimal selection.
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 ature of coal can not be destroyed and the sulfide linkage fracture can be between 50-150 ℃, made again.The free sulphur that generates can with coal in hydrogen, oxygen react, generate the gases such as H2S, SO2 or COS, from coal, separate out.The microwave frequency of selecting a certain feature is the key of desulfurization.According to experimental result, frequency is between the 8.35-8.40 kilohertz time, and ature of coal and microwave action are comparatively strong.Not only can remove pyritic sulfur, also can remove organic sulfur, organic sulfur at high temperature is decomposed into the volatile sulfur compoundses such as H2S and separates with coal.Desulfurization degree almost can reach 100%.
The present invention is when work, by control device microwave drying chamber discharge gate 8 is closed, microwave drying chamber pan feeding valve 2 is opened, the coal of deposit falls under gravity in the microwave drying chamber 6 in the feed hopper 1, pan feeding valve 2 is closed behind the 6 full coals of microwave drying chamber, microwave drying component system 7 is started working, the 6 interior formation microwave electromagnetic fields in the microwave drying chamber, moisture in the coal rapid heated volatile under the effect of microwave electromagnetic field forms steam, steam and high temperature in the 6 interior formation of microwave drying chamber have increased the air pressure in microwave drying chamber 6, form the height draught head by the air pressure in the hole on the dividing plate 5 and the steam recovery channel 3, under differential pressure action, steam in the microwave drying chamber 6 is discharged after entering in the steam recovery channel 3, after the coal drying is finished, microwave drying component system 7 quits work, and microwave drying chamber discharge gate 8 is opened, and dried coal is fallen in the buffering dust elimination storehouse 9 and be admitted to next procedure by conveying device 10 after dust elimination.A part of steam in the steam recovery channel 3 can be condensed into aqueous water and fall the bottom discharge of steam recovery channel 3, and the gas in the steam recovery channel 3 forms negative pressure simultaneously through the 3 outlet discharges of steam recovery channel in managing.
The present invention is because complete equipment microwave drying chamber 6 arranges respectively height from top to bottom; in; the microwave drying component system of low three groups of different capacities; can make the more continuous and level and smooth operation of whole equipment; because three part microwave drying component systems can work alone; so when one group of microwave drying component system wherein breaks down when maybe needing to safeguard; its pan feeding valve 2 will be closed; stop these microwave drying chamber 6 chargings; other two groups then can not be affected and still work on; so just can in non-stop-machine situation, carry out the diagnosis and repair maintenance to equipment, thereby can significantly improve the utilization of capacity of equipment.
Native system is owing to having adopted observation maintenance window 4 and active clapboard 5 designs, therefore can easily open observation maintenance window 4 clears up, thereby significantly increase work efficiency, the moisture that coal evaporates in the microwave drying chamber can enter by the aperture on the dividing plate steam recovery channel 3; The size of aperture through tightly calculating, also has shielding action to microwave according to microwave wavelength, and microwave can not revealed by aperture, has also ensured operating personnel's safety.
After tool of the present invention adopts said structure, freely falling body principle and microwave technology are combined and are incorporated in the low-order coal drying process, utilize the principle of heating using microwave to remove moisture in the low-order coal, other impurity such as sulphur, phosphorus, and utilize the freely falling body principle as the main mode of movement of coal dry run, thereby save the conveying equipment of dry run, the construction cost of minimizing equipment and operating cost, has energy consumption low, thoroughly dry, control is simple, and floor space is few, safeguard simply the advantage that operating cost is low.
Claims (5)
1. tower-type low-rank coal multiple microwave drying equipment, this equipment of being characterised in that adopts the vertical tower structure, its middle part is the microwave drying chamber of hollow from top to bottom, top, microwave drying chamber arranges feed hopper, bottom, microwave drying chamber arranges buffering dust elimination storehouse, the below in buffering dust elimination storehouse arranges output device, wherein side in the microwave drying chamber arranges the steam recovery channel, all the other each sides arrange the 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 respectively pan feeding valve and discharge gate.
2. tower-type low-rank coal multiple microwave drying equipment according to claim 1 is characterized in that the microwave drying chamber arranges respectively separate high, medium and low three groups of different capacity microwave drying component systems from top to bottom.
3. tower-type low-rank coal multiple microwave drying equipment according to claim 1 is characterized in that evenly being covered with on the active clapboard through hole.
4. tower-type low-rank coal multiple microwave drying equipment according to claim 1 is characterized in that cushioning between dust elimination storehouse and the microwave drying chamber and is 30～120 angles.
5. tower-type low-rank coal multiple microwave drying equipment according to claim 1 is characterized in that the outer setting of steam recovery channel is observed the maintenance window.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108800816A (en) * | 2018-08-30 | 2018-11-13 | 天津真知味食品配料有限公司 | A kind of novel drying device for essence production |
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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 |
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| CN108800816A (en) * | 2018-08-30 | 2018-11-13 | 天津真知味食品配料有限公司 | A kind of novel drying device for essence production |
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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. |