CN103217000B - Steam plate-type rotary drying machine - Google Patents
Steam plate-type rotary drying machine Download PDFInfo
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- CN103217000B CN103217000B CN201310134280.0A CN201310134280A CN103217000B CN 103217000 B CN103217000 B CN 103217000B CN 201310134280 A CN201310134280 A CN 201310134280A CN 103217000 B CN103217000 B CN 103217000B
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- 238000001035 drying Methods 0.000 title abstract description 27
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 9
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- 210000003205 muscle Anatomy 0.000 claims description 25
- 230000002787 reinforcement Effects 0.000 claims description 21
- 239000007788 liquid Substances 0.000 claims description 12
- 210000001624 hip Anatomy 0.000 claims description 8
- 238000009833 condensation Methods 0.000 claims description 6
- 230000005494 condensation Effects 0.000 claims description 4
- 230000000737 periodic effect Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 2
- 229910000679 solder Inorganic materials 0.000 claims description 2
- 239000011229 interlayer Substances 0.000 claims 1
- 239000010410 layer Substances 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 7
- 239000012530 fluid Substances 0.000 abstract 3
- 239000003245 coal Substances 0.000 description 33
- 239000007789 gas Substances 0.000 description 8
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- 238000005516 engineering process Methods 0.000 description 4
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
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- 229910052602 gypsum Inorganic materials 0.000 description 1
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- 229910052742 iron Inorganic materials 0.000 description 1
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- Drying Of Solid Materials (AREA)
Abstract
The invention provides a steam plate-type rotary drying machine (1). The steam plate-type rotary drying machine (1) comprises a rotary drum (3), a steam chamber, a condensed fluid exhaust pipe (7) and multiple plate-type heat exchange units (2), wherein the steam chamber is fixedly arranged in the rotary drum, the condensed fluid exhaust pipe is connected with the steam chamber, the plate-type heat exchange units are connected to the inner wall of the rotary drum and are provided with reinforcing rib structures, ribs of reinforcing ribs are provided with small holes, the plate-type heat exchange units are distributed along the radial direction of the rotary drum and are connected with the steam chamber, the end surfaces, which are close to the inner surface of the rotary drum, of the plate-type heat exchange units, are provided with exhaust ports (14), and the plate-type heat exchange units not only are heat supply sources, but also are material lifters. According to the steam plate-type rotary drying machine provided by the invention, the bearing strength is increased by fully utilizing compact reinforcing rib structures, meanwhile, the reinforcing ribs are provided with the small holes, the end surfaces, which are close to the inner surface of the rotary drum, of the plate-type heat exchange units, are provided with the exhaust ports, and thus the exhaust of condensed fluid and non-condensable gas can be convenient.
Description
Technical field
The present invention relates to the board-like rotary dryer of a kind of steam, it utilizes industrial exhaust heat---steam and flue gas, by plank frame heat exchange unit and revolution, arrange the humidity that regulates coal, and this equipment is also applicable to other contact dryings inflammable and explosive or heat sensitive material.
Background technology
The energy form of China mainly be take coal as main, along with the sharp increase of energy resource consumption, and the hysteresis that new energy development utilizes, energy-conservation extremely urgent with the lifting of coal resources utilization, transformation efficiency.The moisture of China's coal is higher, especially in south, make in coal utilization as this part moisture is wasted many energy, coking industry particularly, although coke output ranks first in the world, the moisture of coking coal is higher, high-quality caking coal worsening shortages, thereby need be according to existing coking production technology and equipment, by coal humidifying technology, improve coke quality and output, and system utilizes coking residual heat resources, realize the lifting of economic benefit and the social benefit of enterprise.
Coal humidifying technology can reduce and stablize the moisture of controlling into coke-oven coal, the difference dry with coal is, it is just slight dry, there is strict moisture to control requirement, moisture stabilization in relatively low level, can reach the object of Improve Efficiency, can not cause because moisture is too low again the difficulty that coke oven and subsequent recovery system operate, realize into the increase of stove coal density, coke and chemical products volume increase, coal gas amount minimizing for coke oven heating, coke quality raising, coking technique and stablizing and carbon dioxide discharge-reduction texts.
Revolution (rotating cylinder) drying machine is a kind of ancient drying equipment, in order to meet dried material (coal) and the discontiguous requirement of drying medium in production, developed indirect type drying equipment, steam-tube rotatory dryer is exactly wherein a kind of, the U.S. starts to research and develop this drier at first, and Japan realize the earliest a steam-tube rotatory dryer as key equipment for coal damping, although external steam-tube rotatory dryer is ripe in the application of coal damping, but along with equipment is to maximization, during supertypeization development, still there is some operations and safety problem in the drying machine of original design, as larger in the deviation of drying machine heat exchange design and actual motion, condensate liquid and fixed gas cannot smooth and easyly be discharged, steam pipe booster, material collophore and sticky wall, drying machine integral slipping play etc., thereby be necessary this drier to do further optimization research and development, meet safety in production and maximize, the requirement of supertype.
Summary of the invention
The problem existing for above-mentioned prior art, the invention provides the board-like rotary dryer of a kind of steam and can make condensate liquid and fixed gas discharge smoothly, when equipment enlarging or large, reduces the generation of drying equipment play.
Technical scheme of the present invention is: the board-like rotary dryer of a kind of steam, comprise revolving drum, be fixed on the vaporium in described revolving drum, the condensate liquid comb being connected with described vaporium, a plurality of plate-type heat-exchange unit being connected on described revolving drum inwall, described plate-type heat-exchange unit is along revolving drum radial distribution, described plate-type heat-exchange unit is connected with described vaporium, described plate-type heat-exchange unit is reinforcing rib structure, on the muscle rib of described reinforcement, have aperture, described plate-type heat-exchange unit has exhaust outlet near the end face of described revolving drum inner surface.Reinforcing rib structure is conducive to improve the mechanical strength of drying machine, and the aperture on muscle rib is beneficial to the smooth discharge of condensate liquid.
Further, on described revolving drum, have bracing frame, described plate-type heat-exchange element solder is on support frame as described above.
Further, the support frame as described above in described revolving drum on same cross section is staggeredly arranged, and forms the periodic structure of 1/4th spirals, and the direction of rotation of spiral turns to consistent with the revolution of described revolving drum.Be that revolving drum is right-hand screw type while clockwise rotating, inhour is left-hand screw type while rotating, and makes wet coal in revolution, be subject to the effect of bracing frame spiral forward propulsion and to drying machine outlet motion.
Further, the muscle rib of described reinforcement is shaped as isosceles triangle, and described aperture is opened on two waists of isosceles triangle.Triangle muscle rib rolls folded forming by plate, adopt Digit Control Machine Tool on flat board, evenly to get regular aperture, aperture is first-selected circular, also can be triangle or quadrangle etc., aperture is positioned at triangle two waist centers, is a lineal layout, also can on two waists, be Sine distribution, form porous muscle rib, each triangle muscle rib passage is communicated.The aperture of opening on triangle muscle rib two waists, can upset the vapor stream in triangular duct on the one hand, the heat convection of strengthening steam and muscle intercostal, can destroy the liquid film of steam-condensation on the other hand, reduced steam-condensation thermal resistance, reinforced transformation conducts heat, thereby the secondary heat transfer dynamics of lifting rib rib improves the integral body of plate-type heat-exchange unit to heating rate.The aperture that two waists of triangle muscle rib passage are outputed communicates steam in the triangular duct of plate-type heat-exchange unit, can further to the distribution of steam, adjust.In described plate-type heat-exchange unit, after steam and plate and the condensation of muscle forced-convection heat transfer, condensate liquid in each steam channel can come together in by the aperture on triangle muscle rib the lower end of plate, being convenient to the round tube from lower end under Action of Gravity Field dredges out smoothly, and after converging, then discharge drying machine from condensate drain in vaporium.
Further, described reinforcement is at least double-decker, is reinforcement in triangle, separates between layers with way-board.Plate-type heat-exchange unit is by lead welding and shaping, and material is stainless steel.The board-like heat exchange unit of described steam makes full use of compact reinforcing rib structure, has improved its bearing strength.
Further, the end face of described plate-type heat-exchange unit is arc structure, between described reinforcement and the end face of described plate-type heat-exchange unit, forms circular arc chamber.Described arc structure is preferably semi arch structure.Described plate-type heat-exchange unit, its one end connects with distribution of steam pipe and is fixing together with vaporium, and the other end is telescopic, through drying machine charging end face, guarantees that it can freely expand with heat and contract with cold, and adopts packing seal form to seal on end face.
One of the present invention is characterised in that, the double-deck triangle reinforcement plate-type heat-exchange unit of passage is, the rotary dryer of plate-type heat exchange structure, the interior steam condensate deliverying unit of plate, the interior deliverying unit of fixed gas of plate and the distribution unit of steam, their integrated revolving drums that is assemblied in, are supported by support roller and gear wheel.The upper/lower terminal of plate is to seal along streamline circular arc type, the chuck that plate-type heat-exchange unit on same axis is provided with by bracing frame connects, a plurality of described plate-type heat-exchanges unit is connected to microscler or overlength plate-type heat-exchange unit in aggregates, realize maximization or the large of the board-like drying machine of steam.
Of the present invention another is characterised in that, in the board-like rotary dryer of steam, each plate-type heat-exchange unit is evenly distributed on revolving drum body section, and plate-type heat-exchange unit is not only one to thermal source, a lifting device especially, make wet coal contact more acutely with heat carrier, more evenly, more abundant.It is long-pending to hot side by increasing rotary drying FU length volume, thereby reduces device length, reduces weight of equipment, especially, when equipment enlarging or large, can alleviate gear wheel stressed, reduces the generation of drying equipment play.High-end at tilting rotary table drier, heat exchange unit end has two laser exhaust outlets, be positioned at the circular cross-section place of plate-type heat-exchange unit upper/lower terminal, and the aperture on the fixed gas muscles along the regular meridians rib in different passages collects in the upper end of plate-type heat-exchange unit in plate, fixed gas is discharged in time in drying machine revolution running.
Of the present invention also have one to be characterised in that, distribution of steam unit at described board-like rotary dryer, between plate-type heat-exchange unit and vaporium, by least two circular distribution pipes, be connected, and according to the height of plate-type heat-exchange unit, increase the distribution pipe connecting, so both ensured the intensity of vaporium, made again steam quadratic distribution in each plate-type heat-exchange unit, become more reasonable.Two circular distribution pipes, pipe in lower end, plate-type heat-exchange unit is the flow export of lime set in plate, pipe in upper end, plate-type heat-exchange unit is the entrance of its steam, and these two circular distribution pipes cycle along with angle of revolution in drying machine revolution changes, the also generating period conversion of its function.
Accompanying drawing explanation
Fig. 1 is stereogram of the present invention.
Fig. 2 is reinforcement lateral junction composition of the present invention.
Fig. 3 is distribution of steam of the present invention and condensate discharge structure chart.
Fig. 4 utilizes the present invention to realize the flow chart of coal damping.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
As shown in Figure 1, Figure 2, Figure 3 shows, the board-like rotary dryer 1 of steam of the present invention comprises revolving drum 3, is fixed on the vaporium 10 in revolving drum 3, the condensate liquid comb 17 being connected with vaporium, a plurality of plate-type heat-exchange unit 2 being connected on revolving drum 3 inwalls, plate-type heat-exchange unit 2 is along revolving drum 3 radial distribution, plate-type heat-exchange unit 2 is connected with vaporium 10, plate-type heat-exchange unit 2 is reinforcement 7 structures, on the muscle rib 8 of reinforcement 7, have aperture 9, plate-type heat-exchange unit 2 has exhaust outlet 4 near the end face of revolving drum 3 inner surfaces.
The board-like rotary dryer of steam provided by the present invention when placing horizontal by certain inclination angle, first-selected 5 °.
Plate-type heat-exchange unit 2 in revolving drum 3 along radial distribution, be preferably and be uniformly distributed, be fixed on the bracing frame 12 of revolving drum 3 inner surface welding, on same axis, by the chuck on bracing frame 12, plate-type heat-exchange unit 2 is together in series, forms microscler or overlength shape plate-type heat-exchange unit, meet maximization or the large demand of equipment.The bracing frame 12 in revolving drum 3 interior same cross sections is staggeredly arranged, form the periodic structure of 1/4th spirals, rotary orientation turns to and mates with the revolution of revolving drum 3, be that revolving drum is right-hand screw type while clockwise rotating, inhour is left-hand screw type while rotating, one, dewing coal thrust forward.The height of plate-type heat-exchange unit 2 is chosen appropriate value according to wet coal filling rate (15%～20%), makes wet coal in revolving drum 3 can bury the plate-type heat-exchange unit 2 at least significant end place; Its width considers the violent intensity of motion of internal diameter, heating region division and the coal particle that wets of revolving drum 3 and determines suitable value; And the end face 11 of plate-type heat-exchange unit 2 is chosen arc structure, reduce the friction between wet coal and plate-type heat-exchange unit, be convenient to reinforcing rib structure moulding in plate, the first-selected semicircular arc-shaped of arc structure, diameter is the width of plate-type heat-exchange unit 2, available steel plate bending forms; The wall thickness of plate-type heat-exchange unit 2, except its intensity meets steam pressure requirement, also needs to consider the corrosion allowance of wet coal and its wearing and tearing.The first-selected stainless steel of material of plate-type heat-exchange unit 2.
When the board-like rotary dryer operation of steam, plate-type heat-exchange unit 2 is one and gives thermal source, is again the lifting device of a wet coal material simultaneously, make wet coal contact more acutely with heat carrier, more evenly, more abundant, the wet coal of strengthening is subject to thermal process in cylinder, improves dry yields.
Compare with existing tubular structure, it is long-pending to hot side that plate-type heat-exchange unit 2 can increase rotary drying FU length volume, increasing degree can reach 30%, thereby minimizing device length, can reduce the weight of equipment, and reduction amplitude can reach 20%, thereby during towards maximization or large drying machine, can alleviate gear wheel stressed, reduce the generation of drying equipment play, the security of raising equipment operation.
The shape of reinforcement can be made various patterns according to actual needs.As shown in Figure 2, plate-type heat-exchange unit 2 is reinforcement 7 structures, muscle rib 8 shapes of reinforcement of the present invention are preferably isosceles triangle, by flat board, roll folded machine-shaping, locate get the aperture 9 that diameter is 1.7mm by Digit Control Machine Tool on flat board, these apertures are positioned on two waists of triangle muscle rib, linearly distribute or Sine distribution, form the structure of porous triangular shape muscle rib, reinforcement is at least double-decker, centre separates with thin plate 13, and above-mentioned overall structure is passed through lead welding and shaping.
As Fig. 2, shown in Fig. 3, vaporium 10 has three chambers, superheated steam enters vaporium 10 from pipe 18, after vaporium 10 once distributes, pass through the connected circular distribution pipe 5 or 6 being arranged above and below and enter plate-type heat-exchange unit 2, carry out quadratic distribution, the circular distribution pipe that each plate-type heat-exchange unit 2 is connected with vaporium 10 is no less than two, according to the height of plate-type heat-exchange unit 2, suitably increase, the quadratic distribution that makes to enter the triangular duct 16 front steam that muscle rib 8 forms is tending towards even, steam enters after triangular duct 16, by the aperture 9 on triangle muscle rib, again in the interior adjustment of every one deck reinforcement 7, distribute, become more even, and steam shuttling back and forth 9 of apertures, also strengthened the secondary heat-transfer capability of the reinforcement 7 of plate-type heat-exchange unit 2, improved the heating rate of giving on 2 surfaces, plate-type heat-exchange unit.
Plate-type heat-exchange unit 2 welds by the circular distribution pipe 5,6 with being arranged above and below away from the end face of the inner surface of revolving drum 3, be fixed on together with vaporium 10 on revolving drum 3, its end face near revolving drum 3 inner surfaces passes the surface of revolving drum 3, can freely expand with heat and contract with cold, by the sealing between the surface of packing seal realization and revolving drum 3.
Steam is when the interior heat convection condensation of triangular duct 16, aperture 9 on muscle rib 8 has destroyed the continuity of condensate film, reduced condensation thermal resistance, improved the heat transfer efficiency of steam and muscle intercostal, condensate liquid can pass through these apertures 9, from upper end, toward lower end, drip, in the circular arc chamber 14 of lower end, collect, thereby be more conducive to gravity that lime set utilizes himself by smooth and easy the dredging out of circular distribution pipe 5 or 6 being arranged above and below, flow to the interior gathering of vaporium 10, and then from the board-like rotary dryer of condensate liquid comb 17 exhaust steam, as for the fixed gas in plate-type heat-exchange unit 2, by the exhaust outlet 4(being beaten on the end face 15 near the inner surface of revolving drum 3 in plate-type heat-exchange unit 2, be preferably two laser exhaust outlets that are arranged above and below) discharge smoothly in time, prevent that plate-type heat-exchange unit internal pressure is excessive, there is explosion.
During due to the work of the board-like rotary dryer of steam in rotary state, the position of the circular distribution pipe 5,6 being arranged above and below constantly changes, when wherein certain circular distribution pipe is in relative upper end, this circular distribution pipe is as the entrance of steam, circular distribution pipe in relative lower end is as the condensate stream outlet in plate-type heat-exchange unit 2, circular distribution pipe 5,6 is along with the angle of revolution cycle of the board-like rotary dryer of steam changes, and its function also generating period converts.
As shown in Figure 4; for the flow chart of the board-like rotary dryer of steam provided by the present invention for coal damping; adopt low-pressure superheated steam, blast furnace or flue gases of cock oven that gypsum produces line as coal damping to hot body and carrier gas, through the board-like rotary dryer 1 of monitoring analysis 19, steam of wet coal, vent gas treatment 20 with the low-grade degree of depth waste heat recovery 21 of condensing, the UTILIZATION OF VESIDUAL HEAT IN 22 of steam condensate, circulation reclaim 23, the monitoring analysis 26 of tail gas monitoring 24, nitrogen and steam safeguard protection 25 and dry coal carries out coal damping and controls.
The present invention's thermal source steam used can be the low-pressure superheated steam of iron and steel enterprise's desulfurated plaster production line, also can using the flue gas of coke oven, blast furnace as dry heat carrier gas.
The board-like rotary dryer of steam provided by the present invention is not only applicable to the coal damping of coking metallurgy industry, is applicable to the brown coal drying of power industry, the PTA of the cement raw material drying of building material industry, chemical industry etc. are dry and being dried etc. of food and pharmaceutical industry yet.
Although the present invention with preferred embodiment openly as above, they are not for limiting the present invention, are anyly familiar with this skill person, without departing from the spirit and scope of the invention, certainly, when making various changes or retouch, belong to equally the present invention's protection domain.Therefore protection scope of the present invention should with the application claim was defined is as the criterion.
Claims (12)
1. the board-like rotary dryer of steam, comprise revolving drum, be fixed on the vaporium in described revolving drum, the condensate liquid comb being connected with described vaporium, a plurality of plate-type heat-exchange unit being connected on described revolving drum inwall, described plate-type heat-exchange unit is along revolving drum radial distribution, described plate-type heat-exchange unit is connected with described vaporium, it is characterized in that: described plate-type heat-exchange unit is reinforcing rib structure, on the muscle rib of described reinforcement, have aperture, described plate-type heat-exchange unit has exhaust outlet near the end face of described revolving drum inner surface.
2. the board-like rotary dryer of steam according to claim 1, is characterized in that: on described revolving drum, have bracing frame, described plate-type heat-exchange element solder is on support frame as described above.
3. the board-like rotary dryer of steam according to claim 2, it is characterized in that: the support frame as described above in described revolving drum on same cross section is staggeredly arranged, the periodic structure that forms 1/4th spirals, the direction of rotation of spiral turns to consistent with the revolution of described revolving drum.
4. according to the board-like rotary dryer of steam described in claim 1,2 or 3, it is characterized in that: the muscle rib of described reinforcement be shaped as isosceles triangle, described aperture is opened on two waists of isosceles triangle.
5. the board-like rotary dryer of steam according to claim 4, is characterized in that: described reinforcement is at least double-decker, separates between layers with way-board.
6. according to the board-like rotary dryer of steam described in claim 1,2 or 3, it is characterized in that: the end face of described plate-type heat-exchange unit is arc structure, between described reinforcement and the end face of described plate-type heat-exchange unit, form circular arc chamber.
7. the board-like rotary dryer of steam according to claim 6, is characterized in that: described arc structure is semi arch structure.
8. according to the board-like rotary dryer of steam described in claim 1,2 or 3, it is characterized in that: any described plate-type heat-exchange unit is connected with described vaporium by least two circular distribution pipes that are arranged above and below away from the end face of described revolving drum inner surface.
9. according to the board-like rotary dryer of the steam described in claim 2 or 3, it is characterized in that: on support frame as described above, there is chuck, by chuck, a plurality of described plate-type heat-exchanges unit is connected to microscler board-like heat exchange unit in aggregates.
10. according to the board-like rotary dryer of steam described in claim 1,2 or 3, it is characterized in that: described plate-type heat-exchange unit is evenly distributed on described revolving drum.
The board-like rotary dryer of 11. steam according to claim 1, it is characterized in that: described plate-type heat-exchange unit is the triangle reinforcement plate-type heat-exchange unit with double-deck passage, upper/lower terminal is semi arch sealing, be fixed on the bracing frame on turning circle barrel, described triangle reinforcement is evenly distributed, and is at least double-decker, every interlayer separates with a way-board, on two waists of muscle rib, be uniformly distributed a plurality of apertures, thereby each triangular duct communicates; The semi arch place of described upper/lower terminal has laser exhaust outlet.
The board-like rotary dryer of 12. steam according to claim 11, is characterized in that: in described plate-type heat-exchange unit, steam is through plate and interior muscle heat exchange condensation, and condensate liquid comes together in the lower end of plate by the aperture on triangle muscle rib, be convenient to smooth outflow; Between described plate-type heat-exchange unit and vaporium, by least two circular distribution pipes, the circular distribution pipe in lower end is the flow export of plate-type heat-exchange unit condensate liquid, and the circular distribution pipe in upper end is the entrance of plate-type heat-exchange unit steam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310134280.0A CN103217000B (en) | 2013-04-18 | 2013-04-18 | Steam plate-type rotary drying machine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310134280.0A CN103217000B (en) | 2013-04-18 | 2013-04-18 | Steam plate-type rotary drying machine |
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| CN103217000A CN103217000A (en) | 2013-07-24 |
| CN103217000B true CN103217000B (en) | 2014-11-26 |
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| CN106643094A (en) * | 2016-11-30 | 2017-05-10 | 深圳市瑞升华科技股份有限公司 | Drying machine |
| CN113519574B (en) * | 2021-08-10 | 2022-11-01 | 内蒙古康美食品有限责任公司 | Automatic moon cake production line |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4066262B2 (en) * | 2003-12-15 | 2008-03-26 | Ｊｆｅ環境ソリューションズ株式会社 | Waste pyrolysis equipment |
| DE102006023389A1 (en) * | 2006-05-17 | 2007-11-22 | Herbert Kannegiesser Gmbh | Method and device for treating, preferably washing, spinning and / or drying, laundry |
| CN201555429U (en) * | 2009-11-10 | 2010-08-18 | 兰州瑞德干燥技术有限公司 | Steam chamber structure of steam rotary cylinder dryer for powdered coal |
| CN201589514U (en) * | 2010-01-27 | 2010-09-22 | 王旗 | Multi-compartment rotary drying cylinder structure of flue-gas bagasse dryer |
| KR101293557B1 (en) * | 2011-02-14 | 2013-08-19 | 전찬호 | A method of drying sawdust and pelletizing for sawdust product for livestock by using steam |
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