TW201629416A - Indirect heating/drying equipment and method of drying low-grade coal - Google Patents
Indirect heating/drying equipment and method of drying low-grade coal Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
- F26B17/30—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rotary or oscillating containers; with movement performed by rotary floors
- F26B17/32—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rotary or oscillating containers; with movement performed by rotary floors the movement being in a horizontal or slightly inclined plane
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/14—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects using gases or vapours other than air or steam, e.g. inert gases
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Description
本發明是有關於至少串聯地連接2個蒸汽管式乾燥機(steam tube dryer)等之間接加熱型旋轉乾燥機，而將已藉由第1間接加熱型旋轉乾燥機所乾燥之被乾燥物再以後段之第2間接加熱型旋轉乾燥機進一步乾燥之間接加熱乾燥裝置，以及藉由上述間接加熱乾燥裝置而將劣質煤作為上述被乾燥物乾燥之劣質煤的乾燥方法。 The present invention relates to an indirect heating type rotary dryer in which at least two steam tube dryers are connected in series, and the dried object which has been dried by the first indirect heating type rotary dryer In the second indirect heating rotary dryer of the subsequent stage, the heat drying apparatus is further dried, and the inferior coal is used as a drying method of the inferior coal which is dried by the indirect heat drying apparatus.
本案是根據已於2014年11月25日於日本申請之專利申請案2014-237679號主張優先權，並在此援用其內容。 The present application claims priority from Japanese Patent Application No. 2014-237679, filed on Jan.
已知在將含水率一般皆高達10~70重量%之褐煤或次煙煤等劣質煤乾燥時，為了抑制其點火特性、粉塵爆炸性，所使用的是加熱源溫度較低之使用了蒸氣的蒸汽管式乾燥機等之間接加熱型旋轉乾燥機。在此，作為如上述地串聯地連接了第1、第2間接加熱型旋轉乾燥機的間接加熱乾燥裝置，本發明之發明人等已在專利文獻1中提出一種 間接加熱乾燥裝置，其是做成：在第1間接加熱型旋轉乾燥機中以相對於被乾燥物之流動為並流的形式，且在第2間接加熱型旋轉乾燥機中以相對於被乾燥物之流動為對流的形式來供給用於將由被乾燥物所蒸發出之液體成分排出的載體氣體。 It is known that when drying low-quality coal such as lignite or sub-bituminous coal having a water content of generally 10 to 70% by weight, in order to suppress ignition characteristics and dust explosion property, a steam tube using steam having a lower heating source temperature is used. A heating type rotary dryer is connected between the dryers and the like. Here, the inventor of the present invention has proposed an indirect heating and drying device in which the first and second indirect heating type rotary dryers are connected in series as described above. An indirect heating and drying device in which a first indirect heating type rotary dryer is cocurrent with respect to a flow of the object to be dried, and is dried in a second indirect heating type rotary dryer. The flow of the substance supplies a carrier gas for discharging the liquid component evaporated from the object to be dried in the form of convection.
根據這種間接加熱乾燥裝置，在第1間接加熱型旋轉乾燥機中可抑制粉塵的產生，並且在被乾燥物和載體氣體之入口側可使被乾燥物難以附著到加熱管上，在被乾燥物和載體氣體之出口側則不容易發生結露。另一方面，第2間接加熱型旋轉乾燥機中，在被乾燥物之入口側(亦即載體氣體之出口側)會變得不易發生結露或附著，並且可使朝機外排出的粉塵變少。又，在被乾燥物之出口側(亦即載體氣體之入口側)會因為載體氣體的露點低因而很適合促進被乾燥物的減速乾燥。 According to the indirect heating and drying device, the generation of dust can be suppressed in the first indirect heating type rotary dryer, and the object to be dried is hard to adhere to the heating pipe at the inlet side of the object to be dried and the carrier gas, and is dried. Condensation is less likely to occur on the outlet side of the material and carrier gas. On the other hand, in the second indirect heating rotary dryer, dew condensation or adhesion is less likely to occur on the inlet side of the object to be dried (that is, the outlet side of the carrier gas), and dust discharged to the outside of the machine can be reduced. . Further, on the outlet side of the object to be dried (that is, the inlet side of the carrier gas), it is suitable for promoting deceleration drying of the object to be dried because the dew point of the carrier gas is low.
專利文獻1：日本專利特開2009-097783號公報 Patent Document 1: Japanese Patent Laid-Open Publication No. 2009-097783
順便一提，在此專利文獻1中所記載的是當被乾燥物為褐煤等可燃性物質時，使用氮氣作為上述載體氣體。因此，藉由使氮氣作為載體氣體而使其循環並供給於第1、第2間接加熱型旋轉乾燥機兩者，可將在這些第1、第2間接 加熱型旋轉乾燥機之全乾燥步驟中從被乾燥物中蒸發出之液體成分排出。然而，在如上述之間接加熱乾燥裝置上，氮氣之循環風量會增多，因而使設備運轉所需之能量及運轉成本增加，並且還需要較大之循環供給設備，因而使設備成本也增加的可能性變高。 By the way, in this patent document 1, when the to-be-dried material is a combustible substance, such as a lignite, nitrogen gas is used as the said carrier gas. Therefore, by circulating nitrogen gas as a carrier gas and supplying it to both the first and second indirect heating type rotary dryers, the first and second indirects can be used. The liquid component evaporated from the dried product is discharged in the entire drying step of the heating rotary dryer. However, in the above-described intermittent heating and drying device, the amount of circulating air of nitrogen is increased, so that the energy and running cost required for the operation of the equipment are increased, and a large circulation supply device is required, so that the cost of the equipment is also increased. Sex becomes higher.
本發明是在此種背景下所作成的，目的在於提供一種可謀求此種運轉能量及運轉成本、設備成本之減少的有效率的間接加熱乾燥裝置，並且提供一種使用了間接加熱乾燥裝置之安全的劣質煤的乾燥方法。 The present invention has been made in such a background, and an object thereof is to provide an efficient indirect heating and drying apparatus which can reduce such operating energy, operating cost, and equipment cost, and provides a safety using an indirect heating and drying apparatus. The drying method of inferior coal.
為了解決上述課題以達成此種目的，本發明之間接加熱乾燥裝置具備第1、第2間接加熱型旋轉乾燥機，該第1、第2間接加熱型旋轉乾燥機是在可繞中心軸線旋轉的旋轉筒內配置加熱管，以乾燥供給至上述旋轉筒內之一端部側的被乾燥物再由另一端部側排出，並且藉由供給至上述旋轉筒內之載體氣體來排出從上述被乾燥物中蒸發出之液體成分，該間接加熱乾燥裝置且是將從上述第1間接加熱型旋轉乾燥機中的上述旋轉筒的另一端部側排出之上述被乾燥物供給至上述第2間接加熱型旋轉乾燥機中的上述旋轉筒的一端部側以進一步進行乾燥。該間接加熱乾燥裝置是將低氧濃度氣體作為上述載體氣體供給至上述第2間接加熱型旋轉乾燥機中的上述旋轉筒內，並將大氣作為上述載體氣體供給至上述第1間接加熱型旋轉乾燥機中的上述旋轉筒內。 In order to achieve the above object, the indirect heating and drying apparatus according to the present invention includes first and second indirect heating type rotary dryers, and the first and second indirect heating type rotary dryers are rotatable about a central axis. A heating pipe is disposed in the rotating cylinder to dry the object to be dried which is supplied to one end side of the rotating drum, and is discharged from the other end side, and is discharged from the object to be dried by the carrier gas supplied into the rotating drum. The indirect heating and drying device supplies the dried object discharged from the other end side of the rotating drum in the first indirect heating rotary dryer to the second indirect heating type rotation One end side of the above-mentioned rotating drum in the dryer is further dried. In the indirect heating and drying device, the low oxygen concentration gas is supplied as the carrier gas to the rotating drum in the second indirect heating rotary dryer, and the atmosphere is supplied as the carrier gas to the first indirect heating type rotary drying. Inside the above rotating cylinder in the machine.
又，本發明之劣質煤的乾燥方法是透過此種間接加熱乾燥裝置，而將劣質煤作為上述被乾燥物來乾燥之劣質煤的乾燥方法。上述劣質煤是以上述第1間接加熱型旋轉乾燥機朝向臨界含水率進行恆速乾燥，其次再以上述第2間接加熱型旋轉乾燥機減速乾燥至臨界含水率以下。 Further, the drying method of the inferior coal of the present invention is a drying method of inferior coal which is dried by using the inferior coal as the above-mentioned dried product through the indirect heating and drying device. The inferior coal is subjected to constant-speed drying at a critical moisture content by the first indirect heating rotary dryer, and then decelerated and dried to a critical moisture content or lower by the second indirect heating rotary dryer.
在如上述而構成之間接加熱乾燥裝置及劣質煤的乾燥方法中，是將已藉由第1間接加熱型旋轉乾燥機來使其乾燥的被乾燥物再進一步以後段之第2間接加熱型旋轉乾燥機間接加熱。因而，與專利文獻1所記載之間接加熱乾燥裝置相同地，因為將氮氣等低氧濃度氣體作為載體氣體供給至第2間接加熱型旋轉乾燥機，所以可藉由此低氧濃度氣體防止被乾燥物之起火等。 In the drying method in which the heating and drying device and the inferior coal are connected to each other as described above, the object to be dried which has been dried by the first indirect heating type rotary dryer is further rotated by the second indirect heating type in the subsequent stage. The dryer is heated indirectly. Therefore, in the same manner as the heat drying device described in Patent Document 1, since the low oxygen concentration gas such as nitrogen gas is supplied as the carrier gas to the second indirect heating type rotary dryer, the low oxygen concentration gas can be prevented from being dried. The fire of the object, etc.
另一方面，在供給含水率高而起火等之可能性低的被乾燥物的前段之第1間接加熱型旋轉乾燥機中，則是保持在含水率比由恆速乾燥期推移至減速乾燥期時之含水率(即臨界含水率)更高的乾燥。因此，藉由將大氣作為載體氣體供給至第1間接加熱型旋轉乾燥機，就能夠在不需要低氧濃度氣體之供給設備的情況下將所蒸發的液體成分排出。從而，即使被乾燥物是劣質煤，也可以安全地使被乾燥物乾燥，並且能夠謀求間接加熱裝置整體之運轉所需之能量及運轉成本、設備成本之減少。 On the other hand, in the first indirect heating rotary dryer in which the front portion of the object to be dried having a high water content and a low possibility of ignition or the like is supplied, the water content ratio is maintained from the constant-speed drying period to the deceleration drying period. The moisture content at the time (ie, the critical moisture content) is higher. Therefore, by supplying the atmosphere as a carrier gas to the first indirect heating type rotary dryer, it is possible to discharge the evaporated liquid component without requiring a supply device for the low oxygen concentration gas. Therefore, even if the object to be dried is inferior coal, it is possible to safely dry the object to be dried, and it is possible to reduce the energy, the running cost, and the equipment cost required for the operation of the entire indirect heating device.
此處，將上述第1間接加熱型旋轉乾燥機中的上述旋轉筒的另一端部和上述第2間接加熱型旋轉乾燥機中的上述旋轉筒的一端部之間，是以例如輸送機(conveyor) 等之移送機構或料斗(hopper)等之暫時儲存機構，或是以錘式碎煤機(hammer crusher)等之破碎機構等的連接機構來連接。在這種情況中，為了防止上述連接機構中之被乾燥物的起火等，此連接機構宜以低氧濃度氣體來沖洗(purge)。 Here, between the other end portion of the rotating drum in the first indirect heating rotary dryer and the one end portion of the rotary cylinder in the second indirect heating rotary dryer, for example, a conveyor (conveyor) ) Such as a temporary storage mechanism such as a transfer mechanism or a hopper, or a connection mechanism such as a crushing mechanism such as a hammer crusher. In this case, in order to prevent ignition of the object to be dried in the above-described connection mechanism, the connection mechanism is preferably purged with a low oxygen concentration gas.
又，由上述第2間接加熱型旋轉乾燥機所排出之由低氧濃度氣體形成之上述載體氣體，在藉由袋濾器(bag filter)除塵後因應需要進行除濕，然後再使其循環至第2間接加熱型旋轉乾燥機之上述旋轉筒之作法是有效率的。另一方面，將從上述第1間接加熱型旋轉乾燥機所排出之由大氣(空氣)形成的上述載體氣體，會在施以除塵之後釋放至大氣中。又，因為供給至第1間接加熱型旋轉乾燥機之載體氣體可另外從大氣中吸引，因此在第1間接加熱型旋轉乾燥機中並不需要進行所排出之載體氣體的除濕。因此，可以謀求運轉能量及運轉成本、設備成本的進一步的削減。又，因為藉由將第1間接加熱型旋轉乾燥機之旋轉筒內的載體氣體的流動形成沿著第1間接加熱型旋轉乾燥機之被乾燥物的搬送方向的並流，而能夠朝著進行被乾燥物之乾燥的搬送方向使第1間接加熱型旋轉乾燥機之載體氣體的含水率上升，因此可以更進一步有效地防止起火等。 Further, the carrier gas formed of the low oxygen concentration gas discharged from the second indirect heating type rotary dryer is dehumidified as needed after being removed by a bag filter, and then circulated to the second The above-described rotary drum of the indirect heating rotary dryer is efficient. On the other hand, the carrier gas formed from the atmosphere (air) discharged from the first indirect heating type rotary dryer is released into the atmosphere after being subjected to dust removal. Further, since the carrier gas supplied to the first indirect heating rotary dryer can be additionally sucked from the atmosphere, it is not necessary to perform dehumidification of the discharged carrier gas in the first indirect heating rotary dryer. Therefore, it is possible to further reduce the operating energy, the running cost, and the equipment cost. In addition, the flow of the carrier gas in the rotary cylinder of the first indirect heating rotary dryer can be formed in parallel along the conveyance direction of the object to be dried of the first indirect heating rotary dryer. The direction in which the dried material is dried causes the water content of the carrier gas of the first indirect heating rotary dryer to increase, so that it is possible to more effectively prevent ignition or the like.
此外，因為具備第1、第2之至少2個間接加熱型旋轉乾燥機，因此可將一個個間接加熱型旋轉乾燥機小型化，進而可以減少設備成本及運轉成本。並且，其中後段之第2間接加熱型旋轉乾燥機中的乾燥是減速乾燥而使液體成分(水分)的蒸發量較少。因此，可以將上述第2間接加 熱型旋轉乾燥機中的加熱管的熱傳面積做成比上述第1間接加熱型旋轉乾燥機之加熱管的熱傳面積小，或者將供給至上述第2間接加熱型旋轉乾燥機之上述載體氣體的供給量設成比供給至第1間接加熱型旋轉乾燥機之上述載體氣體的供給量少。藉此，在第2間接加熱型旋轉乾燥機中也可以減少運轉能量及運轉成本、設備成本，而變得可謀求作為間接加熱乾燥裝置整體之該能量及成本的更進一步的減少。 Further, since at least two indirect heating type rotary dryers of the first and second types are provided, it is possible to downsize one indirect heating type rotary dryer, and it is possible to reduce equipment cost and running cost. Further, the drying in the second indirect heating rotary dryer of the latter stage is decelerated and dried to reduce the amount of evaporation of the liquid component (moisture). Therefore, the above second indirect addition can be added The heat transfer area of the heating pipe in the hot rotary dryer is smaller than the heat transfer area of the heating pipe of the first indirect heating rotary dryer, or is supplied to the carrier of the second indirect heating rotary dryer. The supply amount of the gas is set to be smaller than the supply amount of the carrier gas supplied to the first indirect heating type rotary dryer. As a result, in the second indirect heating rotary dryer, the operating energy, the running cost, and the equipment cost can be reduced, and the energy and cost of the entire indirect heating and drying device can be further reduced.
如以上所說明地，根據本發明，在第1間接加熱型旋轉乾燥機中並不需要低氧濃度氣體之供給及循環，而可以將作為間接加熱乾燥裝置整體之運轉能量及運轉成本、設備成本削減。又，即使被乾燥物是劣質煤等可燃性物質也可預防起火等而安全地使其乾燥。 As described above, according to the present invention, the supply and circulation of the low oxygen concentration gas are not required in the first indirect heating type rotary dryer, and the operation energy, the operation cost, and the equipment cost as the entire indirect heating and drying device can be used. reduce. Moreover, even if the object to be dried is a combustible substance such as inferior coal, it can be safely dried by preventing fire or the like.
1‧‧‧第1間接加熱型旋轉乾燥 機 1‧‧‧1st indirect heating type rotary drying machine
2‧‧‧第2間接加熱型旋轉乾燥 機 2‧‧‧2nd indirect heating rotary drying machine
3‧‧‧旋轉筒 3‧‧‧Rotating cylinder
4‧‧‧供給機構 4‧‧‧Supply institutions
5‧‧‧排出機構 5‧‧‧Discharge agencies
5a‧‧‧排出螺旋輸送機 5a‧‧‧Draining screw conveyor
6‧‧‧連接機構 6‧‧‧Connecting institutions
7‧‧‧裝入筒 7‧‧‧Loading cylinder
8‧‧‧供給填裝機構 8‧‧‧Supply filling agency
9‧‧‧搬出機構 9‧‧‧ Moving out of the agency
11‧‧‧引風機 11‧‧‧ induced draft fan
12‧‧‧第1袋濾器 12‧‧‧1st bag filter
21‧‧‧第2袋濾器 21‧‧‧2nd bag filter
22、28‧‧‧低氧濃度氣體供給源 22, 28‧‧‧ Low oxygen concentration gas supply source
23、25‧‧‧冷卻塔 23, 25‧‧‧ Cooling tower
24‧‧‧循環風扇 24‧‧‧Circular fan
26‧‧‧加熱器 26‧‧‧heater
27‧‧‧閥 27‧‧‧Valves
29‧‧‧集塵機 29‧‧‧ dust collector
G1‧‧‧第1載體氣體 G1‧‧‧1st carrier gas
G2‧‧‧第2載體氣體 G2‧‧‧2nd carrier gas
W‧‧‧被乾燥物 W‧‧‧Dry objects
圖1是顯示本發明之間接加熱乾燥裝置之一實施形態的概要圖。 BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing an embodiment of an indirect heating and drying apparatus of the present invention.
圖1是顯示本發明之間接加熱乾燥裝置之一實施形態的概要圖。本實施形態之間接加熱乾燥裝置具備將被乾燥物W乾燥之第1、第2的2個間接加熱型旋轉乾燥機(以下，簡稱為乾燥機)1、2。在此，以本實施形態之間接加熱乾燥裝置而使其乾燥的被乾燥物W，是含水率一般皆高達10~70 重量%之褐煤或次煙煤等劣質煤，且粒徑為2~50mm左右。 BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing an embodiment of an indirect heating and drying apparatus of the present invention. In the present embodiment, the indirect heating and drying device includes first and second indirect heating rotary dryers (hereinafter simply referred to as dryers) 1 and 2 for drying the object to be dried. Here, the object to be dried W which is dried by the heating and drying device in the present embodiment is generally 10 to 70 in water content. Inferior coal such as lignite or sub-bituminous coal, and the particle size is about 2 to 50 mm.
此外，這些第1、第2乾燥機1、2，是與專利文獻1所記載之間接加熱乾燥裝置中的乾燥機同樣的蒸汽管式乾燥機。亦即，第1、第2乾燥機1、2不論哪一個都在可繞大致水平之中心軸線旋轉的圓筒狀之旋轉筒3內的內壁面上與上述中心軸線平行地配置複數支圖未示之加熱管。又，在第1、第2乾燥機1、2之各旋轉筒3的一端(圖1中的左端)部上有螺旋輸送機(screw conveyor)等之供給機構4，並且在另一端(圖1中的右端)部上有排出套殼等之排出機構5，且各自相對於可旋轉之旋轉筒3以非旋轉且氣密的形式被設置。 In addition, these first and second dryers 1 and 2 are the same steam tube dryers as those of the dryer in the heating and drying apparatus described in Patent Document 1. In other words, the first and second dryers 1 and 2 are arranged in parallel with the central axis on the inner wall surface of the cylindrical rotating drum 3 rotatable about a substantially horizontal central axis. Show the heating tube. Further, at one end (the left end in FIG. 1) of each of the first and second dryers 1 and 2, a supply mechanism 4 such as a screw conveyor is provided on the other end (Fig. 1). The right end portion of the middle portion has a discharge mechanism 5 for discharging the casing or the like, and each is disposed in a non-rotational and airtight manner with respect to the rotatable rotary cylinder 3.
此種乾燥機1、2，可藉由從圖未示之蒸氣供給源而被供給至上述加熱管內之150℃~230℃左右的高溫之蒸氣，來將藉由供給機構4從旋轉筒3之一端部側供給至旋轉筒3內之被乾燥物W加熱乾燥，並藉由旋轉筒3之旋轉而搬送至另一端部側並由排出機構5排出。又，透過加熱而從被乾燥物W所蒸發出之液體成分(水分)會透過供給至旋轉筒3內之第1、第2載體氣體G1、G2而被排出。 The dryers 1 and 2 can be supplied from the rotary cylinder 3 by the supply mechanism 4 by supplying a high-temperature vapor of about 150 ° C to 230 ° C in the heating tube from a vapor supply source (not shown). One of the end portions is heated and dried by the object to be dried W supplied into the rotary cylinder 3, and is conveyed to the other end side by the rotation of the rotary cylinder 3, and is discharged by the discharge mechanism 5. In addition, the liquid component (moisture) evaporated from the object W to be dried by the heat is discharged through the first and second carrier gases G1 and G2 supplied into the rotary cylinder 3.
其中，第1乾燥機1中的排出機構5是透過具備有如圖1所示之輸送機等移送機構，或圖未示之料斗等之暫時儲存機構及錘式碎煤機等破碎機構之連接機構6而被連接於第2乾燥機2中的供給機構4。 In addition, the discharge mechanism 5 in the first dryer 1 is a connection mechanism that transmits a crushing mechanism such as a transfer mechanism such as a conveyor shown in FIG. 1 or a temporary storage mechanism such as a hopper not shown, and a hammer type coal crusher. 6 is connected to the supply mechanism 4 in the second dryer 2.
再者，連接機構6也會涵蓋從第1乾燥機1中的旋轉筒3之另一端部側的排出機構5到第2乾燥機2中的旋轉筒3之一 端部側的供給機構4而氣密地被保持。又，在第1乾燥機1之供給機構4上是透過裝入筒7而連接螺旋輸送機等之被乾燥物W之供給填裝機構8。另一方面，在第2乾燥機2之排出機構5上，連接有輸送機等之搬出機構9。 Further, the connection mechanism 6 also covers one of the discharge mechanism 5 from the other end side of the rotary cylinder 3 in the first dryer 1 to the rotary cylinder 3 in the second dryer 2. The supply mechanism 4 on the end side is airtightly held. Further, the supply mechanism 4 of the first dryer 1 is connected to the supply unit 8 of the to-be-dried material W such as a screw conveyor through the loading cylinder 7. On the other hand, in the discharge mechanism 5 of the second dryer 2, a carry-out mechanism 9 such as a conveyor is connected.
因此，在本實施形態中，也是將第1、第2乾燥機1、2串聯地配置，並將由第1乾燥機1中的旋轉筒3的另一端部側所排出之被乾燥物W供給至第2乾燥機2中的旋轉筒3的一端部側而使其進一步乾燥。如此進行而使其乾燥之被乾燥物W的含水率可例如藉由第1乾燥機1而減少至3重量%以上，且較理想的是6~8重量%之臨界含水率為止，並進一步以第2乾燥機減少至約1重量%以下。 Therefore, in the present embodiment, the first and second dryers 1 and 2 are arranged in series, and the object to be dried W discharged from the other end side of the rotary drum 3 in the first dryer 1 is supplied to The one end side of the rotating drum 3 in the second dryer 2 is further dried. The moisture content of the dried object W thus dried can be reduced to, for example, 3% by weight or more by the first dryer 1, and more desirably, a critical moisture content of 6 to 8% by weight, and further The second dryer is reduced to about 1% by weight or less.
另一方面，供給至這些第1、第2乾燥機1、2之旋轉筒3內的上述第1、第2載體氣體G1、G2，是經由相互獨立之供給路徑而被供給。其中，被供給至第2乾燥機2之第2載體氣體G2宜為氧濃度為1體積%以下，較佳是0.5體積%以下之例如氮氣等的低氧濃度氣體。第2載體氣體G2是由第2乾燥機2之旋轉筒3之上述另一端部側供給而由一端部側排出，並且使其再循環至第2乾燥機2之旋轉筒3的另一端部側。亦即，在本實施形態中，也是使第2乾燥機2之旋轉筒3內的第2載體氣體G2的流動形成為與被乾燥物W之搬送方向相向之對流。 On the other hand, the first and second carrier gases G1 and G2 supplied to the rotary cylinders 3 of the first and second dryers 1 and 2 are supplied via mutually independent supply paths. In particular, the second carrier gas G2 to be supplied to the second dryer 2 is preferably a low oxygen concentration gas such as nitrogen gas having an oxygen concentration of 1% by volume or less, preferably 0.5% by volume or less. The second carrier gas G2 is supplied from the other end side of the rotary cylinder 3 of the second dryer 2, and is discharged from the one end side, and is recirculated to the other end side of the rotary cylinder 3 of the second dryer 2 . In other words, in the present embodiment, the flow of the second carrier gas G2 in the rotating drum 3 of the second dryer 2 is also convected in the direction in which the object to be dried W is conveyed.
由第2乾燥機2之旋轉筒3的一端部側所排出之第2載體氣體G2，會由連接於此一端部之供給機構4供給至袋濾器(第2袋濾器)21。然後，將與第2載體氣體G2一起由第2 乾燥機2所排出之被乾燥物W的粉塵等固形物除塵後回收，且所回收之固形物會回到上述連接機構6或第2乾燥機2之供給機構4。再者，也可以在第2乾燥機2的供給機構4和第2袋濾器21之間設置預備旋風器(cyclone)。又，可由低氧濃度氣體供給源22將如上述之低氧濃度氣體供給至第2袋濾器21。 The second carrier gas G2 discharged from the one end side of the rotary cylinder 3 of the second dryer 2 is supplied to the bag filter (second bag filter) 21 by the supply mechanism 4 connected to the one end portion. Then, together with the second carrier gas G2, the second The solid matter such as dust of the object to be dried W discharged from the dryer 2 is removed and collected, and the recovered solid matter is returned to the connection mechanism 6 or the supply mechanism 4 of the second dryer 2. Further, a preparatory cyclone may be provided between the supply mechanism 4 of the second dryer 2 and the second bag filter 21. Further, the low oxygen concentration gas as described above can be supplied to the second bag filter 21 by the low oxygen concentration gas supply source 22.
如此進行而除去固形物後之第2載體氣體G2，透過被送至冷卻塔23並被冷卻之方式而除濕之後，可經過循環風扇24而被加壓，並因應需要而以其他的冷卻塔25冷卻。之後，上述第2載體氣體G2會藉由以加熱器26加熱至例如40℃左右為止，來供給至第2乾燥機2中的旋轉筒3的另一端部的排出機構5，以使其循環。再者，也可以如圖1所示地透過閥27而將其他的低氧濃度氣體供給源28連接於冷卻塔23和循環風扇24之間的供給路徑，並因應需要而補充供給低氧濃度氣體。 The second carrier gas G2, which has been removed in this manner and removed from the solid matter, is dehumidified after being sent to the cooling tower 23 and cooled, and then pressurized by the circulation fan 24, and other cooling towers 25 are required as needed. cool down. After that, the second carrier gas G2 is supplied to the discharge mechanism 5 of the other end portion of the rotary drum 3 in the second dryer 2 by the heater 26 to be heated to, for example, about 40 ° C. Further, as shown in FIG. 1, the other low oxygen concentration gas supply source 28 may be connected to the supply path between the cooling tower 23 and the circulation fan 24 through the valve 27, and may be supplied with a low oxygen concentration gas as needed. .
又，在本實施形態中，由第2乾燥機2中的旋轉筒3的一端部側排出至供給機構4的第2載體氣體G2的一部分，是藉由從這個供給機構4流入連接機構6內，而如上述地被充滿於氣密地被保持之連接機構6內而沖洗連接機構6。具體來說，從設置於第1乾燥機1中的排出機構5之下端部的排出螺旋輸送機5a到第2乾燥機2中的供給機構4為止的範圍會以第2載體氣體G2來沖洗。 In the present embodiment, a part of the second carrier gas G2 discharged from the one end side of the rotary cylinder 3 in the second dryer 2 to the supply mechanism 4 flows into the connection mechanism 6 from the supply mechanism 4. The connection mechanism 6 is flushed while being filled in the connection mechanism 6 which is hermetically held as described above. Specifically, the range from the discharge screw conveyor 5a provided at the lower end portion of the discharge mechanism 5 in the first dryer 1 to the supply mechanism 4 in the second dryer 2 is flushed by the second carrier gas G2.
相對於這種第2載體氣體G2，對第1乾燥機1之旋轉筒3則是供給大氣(空氣)作為第1載體氣體G1。此第1載體 氣體G1，是透過引風機11從常溫的大氣中吸引，並且因應需要而透過過濾器等從連接於第1乾燥機1之供給機構4的上述裝入筒7通過供給機構4供給至第1乾燥機1中的旋轉筒3的一端部，再通過旋轉筒3內由另一端部之排出機構5排出。因此，在本實施形態中，第1乾燥機1之旋轉筒3內的第1載體氣體G1的流動，會形成沿著被乾燥物W的搬送方向的並流。 With respect to the second carrier gas G2, the rotating drum 3 of the first dryer 1 is supplied with air (air) as the first carrier gas G1. This first carrier The gas G1 is sucked from the atmosphere at normal temperature by the draft fan 11, and is supplied to the first dry state from the loading cylinder 7 connected to the supply mechanism 4 of the first dryer 1 through a filter or the like through the supply mechanism 4 as needed. One end portion of the rotary cylinder 3 in the machine 1 is discharged through the discharge mechanism 5 at the other end portion in the rotary cylinder 3. Therefore, in the present embodiment, the flow of the first carrier gas G1 in the rotary cylinder 3 of the first dryer 1 forms a parallel flow along the conveyance direction of the object W to be dried.
如此進行而由第1乾燥機1中的旋轉筒3的另一端部排出之第1載體氣體G1，會被供給至連接於另一端部之排出機構5的袋濾器(第1袋濾器)12。與第1載體氣體G1一起由第1乾燥機1所排出之被乾燥物W的粉塵等固形物是以袋濾器(第1袋濾器)12除塵並回收，而將第1載體氣體G1透過上述引風機11排出至大氣中。再者，藉由第1袋濾器12所回收之固形物會被供給至連接機構6中的上述移送機構等。 In this manner, the first carrier gas G1 discharged from the other end portion of the rotary cylinder 3 in the first dryer 1 is supplied to the bag filter (first bag filter) 12 connected to the discharge mechanism 5 at the other end. The solid matter such as dust of the object to be dried W discharged from the first dryer 1 together with the first carrier gas G1 is dusted and collected by a bag filter (first bag filter) 12, and the first carrier gas G1 is transmitted through the above-mentioned introduction. The fan 11 is discharged to the atmosphere. Further, the solid matter recovered by the first bag filter 12 is supplied to the transfer mechanism or the like in the connection mechanism 6.
其次，針對藉由如此所構成之間接加熱乾燥裝置，來將如上述的劣質煤作為被乾燥物W乾燥時之本發明的乾燥方法的一個實施形態進行說明。首先，被乾燥物W是從連接於成為前段之第1乾燥機1之供給填裝機構8透過裝入筒7而被供給填裝至第1乾燥機1之供給機構4。其次，被乾燥物W是藉由供給機構4而從一端部側被供給至第1乾燥機1之旋轉筒3內而被加熱管加熱、乾燥，並且伴隨著旋轉筒3之旋轉而被搬送至另一端部側，以由此另一端部側之排出機構5的上述排出螺旋輸送機5a使其連續地排出。 Next, an embodiment of the drying method of the present invention in which the above-described inferior coal is dried as the dried product W by the above-described indirect heating and drying device will be described. First, the to-be-dried material W is supplied from the supply-filling mechanism 8 connected to the first dryer 1 which is the front stage, and is supplied to the supply mechanism 4 of the first dryer 1 through the loading cylinder 7. Then, the object to be dried W is supplied from the one end side to the inside of the rotary cylinder 3 of the first dryer 1 by the supply mechanism 4, heated and dried by the heating pipe, and conveyed to the rotation of the rotary cylinder 3 to The other end side is continuously discharged by the discharge screw conveyor 5a of the discharge mechanism 5 on the other end side.
又，在此前段之第1乾燥機1中因為使被乾燥物W 乾燥而蒸發出之液體成分(水分)，會在被上述引風機11吸引而與被供給至第1乾燥機1中的旋轉筒3內的第1載體氣體G1(大氣)一起由第1乾燥機1排出，並且如上述地藉由第1袋濾器12來將固形物除塵後，排出至大氣中。在本實施形態中，是藉由此第1乾燥機1中的乾燥以使被乾燥物W經歷恆速乾燥期。亦即，被乾燥物W之溫度為大致固定，且被乾燥物W之含水率會朝著如上述之臨界含水率而下降。再者，如此進行而使其在第1乾燥機1中恆速乾燥過之被乾燥物W的含水率可以藉由測定從第1乾燥機1所排出之被乾燥物W的溫度等，或者直接測定被排出之被乾燥物W的水分來確認。又，藉由根據該結果以控制第1乾燥機1中的對加熱管的蒸氣供給量及溫度等，可以調整被乾燥物W之含水率。 Further, in the first dryer 1 of the previous stage, the object W is dried. The liquid component (moisture) which is evaporated and evaporated is sucked by the air blower 11 and is supplied to the first carrier gas G1 (atmosphere) in the rotary cylinder 3 in the first dryer 1 by the first dryer. 1 is discharged, and the solid matter is removed by the first bag filter 12 as described above, and then discharged to the atmosphere. In the present embodiment, drying of the first dryer 1 is performed to cause the object to be dried W to undergo a constant-speed drying period. That is, the temperature of the object W to be dried is substantially constant, and the moisture content of the object W to be dried is lowered toward the critical moisture content as described above. In this way, the moisture content of the object to be dried W which is dried at a constant speed in the first dryer 1 can be measured by measuring the temperature of the object W to be discharged from the first dryer 1, or the like. The moisture of the discharged object W to be discharged is measured and confirmed. Further, by controlling the amount of steam supplied to the heating pipe, the temperature, and the like in the first dryer 1 based on the result, the moisture content of the object W can be adjusted.
如此進行而藉由第1乾燥機1使其乾燥之被乾燥物W，是透過連接機構6而從後段之第2乾燥機2中的供給機構4被供給至旋轉筒3內，且藉由此旋轉筒3內之加熱管進一步被加熱而使其乾燥成上述臨界含水率以下的含水率。又，被乾燥物W會隨著旋轉筒3之旋轉而被搬送至另一端側，並藉由排出機構5而被排出。在本實施形態中，是藉由在此第2乾燥機2中的乾燥來使被乾燥物W經歷減速乾燥期。亦即，被乾燥物W之溫度會上升，並且被乾燥物W之乾燥速度會變得比恆速乾燥期小。再者，在此第2乾燥機2中，已使其減速乾燥過之被乾燥物W的含水率也可以藉由測定所排出之被乾燥物W的溫度等，或者直接測定水分來確認。又，可藉由根據此結果來控制第2乾燥機2中的對加熱管的蒸氣 供給量及溫度等，而調整含水率。 In this way, the object to be dried W dried by the first dryer 1 is supplied to the rotary cylinder 3 from the supply mechanism 4 in the second dryer 2 in the subsequent stage through the connection mechanism 6, and thereby The heating tube in the rotating drum 3 is further heated to be dried to a moisture content below the critical moisture content. Further, the object to be dried W is conveyed to the other end side in accordance with the rotation of the rotary cylinder 3, and is discharged by the discharge mechanism 5. In the present embodiment, the object to be dried W is subjected to a deceleration drying period by drying in the second dryer 2 here. That is, the temperature of the object to be dried W rises, and the drying speed of the dried object W becomes smaller than the constant-speed drying period. In the second dryer 2, the water content of the object to be dried W which has been decelerated and dried may be determined by measuring the temperature of the object W to be discharged or the like, or directly measuring the moisture. Further, by controlling the vapor of the heating pipe in the second dryer 2 according to the result The water content is adjusted by the supply amount, temperature, and the like.
又，在第2乾燥機2中由被乾燥物W中蒸發出的液體成分(水分)會與第2載體氣體G2一起由旋轉筒3排出，並且藉由以第2袋濾器21將被乾燥物W之固形物除塵後在冷卻塔23、25中冷卻來除濕並回收。此外，如此進行而將已蒸發之液體成分回收的第2載體氣體G2可在以加熱器26加熱後循環至第2乾燥機2。 In the second dryer 2, the liquid component (moisture) evaporated from the object W to be dried is discharged from the rotary cylinder 3 together with the second carrier gas G2, and the object to be dried is dried by the second bag filter 21. The solid matter of W is dehumidified in the cooling towers 23, 25 after dedusting and is recovered. Further, the second carrier gas G2 that has been recovered in this manner and recovers the evaporated liquid component can be circulated to the second dryer 2 after being heated by the heater 26.
在上述構成之間接加熱乾燥裝置及使用了間接加熱乾燥裝置之劣質煤的乾燥方法中，具備有前後段2段的第1、第2乾燥機1、2。因此，相較於以1段的乾燥機來將相同量之被乾燥物W乾燥之情形，可以使一個個乾燥機之大小及旋轉驅動力等減小，而可以謀求設備成本及運轉成本的降低。再者，也可以將乾燥機做成3段以上。又，在如上述地被乾燥物W為劣質煤等之可燃性物質的情況中，會有在第2乾燥機2中使溫度會上升、起火的可能性。然而，在上述構成之間接加熱乾燥裝置中，因為供給至第2乾燥機2之第2載體氣體G2是氮氣等低氧濃度氣體，因此即使像這樣使被乾燥物W的溫度上升仍然可以防止起火。 In the above-described configuration, the heating and drying device and the drying method using the inferior heating and drying device are provided with the first and second dryers 1 and 2 having the front and rear stages. Therefore, compared with the case where the same amount of the object to be dried W is dried by the one-stage dryer, the size and the rotational driving force of each of the dryers can be reduced, and the equipment cost and the running cost can be reduced. . Furthermore, the dryer can be made into three or more stages. In the case where the object to be dried W is a combustible substance such as inferior coal, the temperature of the second dryer 2 may rise and ignite. However, in the above-described configuration, the second carrier gas G2 supplied to the second dryer 2 is a low oxygen concentration gas such as nitrogen gas. Therefore, even if the temperature of the object W is raised as described above, the fire can be prevented. .
另一方面，在第1乾燥機1中，因為被乾燥物W的溫度較第2乾燥機2低並保持在大致固定的溫度上，因此即使供給大氣作為第1載體氣體G1起火的可能性也很低。並且，因為此第1載體氣體G1為大氣，因此並不需要如第2載體氣體G2一般，要有用於供給氣體的低氧濃度氣體供給源22、28。又，可以如上述地藉由引風機11將大氣原樣吸引以供 給至第1乾燥機1，且在以第1袋濾器12除去被乾燥物W之固形物後，原樣排出至大氣中。 On the other hand, in the first dryer 1, since the temperature of the object to be dried W is lower than that of the second dryer 2 and is maintained at a substantially constant temperature, even if the atmosphere is supplied, the first carrier gas G1 may be ignited. Very low. Further, since the first carrier gas G1 is in the atmosphere, it is not necessary to have the low oxygen concentration gas supply sources 22 and 28 for supplying the gas as in the case of the second carrier gas G2. Moreover, the atmosphere can be attracted to the original by the induced draft fan 11 as described above. When it is supplied to the first dryer 1, the solid matter of the object to be dried W is removed by the first bag filter 12, and then discharged to the atmosphere as it is.
因此，相較於像是例如專利文獻1所記載之間接加熱乾燥裝置一般將氮氣等低氧濃度氣體當作載體氣體供給至第1、第2乾燥機兩者之情形，可以減少低氧濃度氣體之供給量(循環量)並使供給所需之設備小型化。因此，即使被乾燥物W是劣質煤，也可以如上述地防止起火以安全地進行乾燥，並且變得可謀求間接加熱乾燥裝置整體運轉所需之能量及運轉成本、設備成本的減少，因而既有效率又符合經濟效益。 Therefore, compared with the case where the low-oxygen gas such as nitrogen gas is supplied as a carrier gas to both the first and second dryers, for example, the indirect heating and drying apparatus described in Patent Document 1, the low oxygen concentration gas can be reduced. The amount of supply (cycle amount) is miniaturized by the equipment required for supply. Therefore, even if the object to be dried W is inferior coal, it is possible to prevent the fire from being safely dried as described above, and it is possible to reduce the energy required for the overall operation of the drying device, the running cost, and the equipment cost. Efficient and economical.
又，在本實施形態中，是將第1乾燥機1中的旋轉筒3的另一端部之排出機構5、和第2乾燥機2中的旋轉筒3的一端部之供給機構4之間，藉由圖1所示之具備有輸送機等之移送機構，或料斗等之暫時儲存機構及錘式碎煤機等之破碎機構的連接機構6而連接著。又，是將此連接機構6氣密地保持，並且以作為第2載體氣體G2而被供給至第2乾燥機2的低氧濃度氣體來沖洗。因此，可以防止已達到臨界含水率之被乾燥物W在此連接機構6中起火。 In the present embodiment, the discharge mechanism 5 of the other end portion of the rotary drum 3 in the first dryer 1 and the supply mechanism 4 of the one end portion of the rotary cylinder 3 in the second dryer 2 are disposed. It is connected by a transfer mechanism including a conveyor or the like, a temporary storage mechanism such as a hopper, and a connection mechanism 6 of a crushing mechanism such as a hammer coal crusher. In addition, the connection mechanism 6 is airtightly held, and is flushed with the low oxygen concentration gas supplied to the second dryer 2 as the second carrier gas G2. Therefore, it is possible to prevent the object W that has reached the critical moisture content from igniting in the connection mechanism 6.
特別是，在本實施形態之間接加熱乾燥裝置中，是將第1、第2載體氣體G1、G2經過具有個別的引風機11和循環風扇24之相互獨立的供給路徑而分別供給至第1、第2乾燥機1、2。因此，可以將這些第1、第2載體氣體G1、G2在不同的條件下供給至第1、第2乾燥機1、2。因此，藉由例如以較第1載體氣體G1更高的壓力來供給第2載體氣體 G2之作法，可以在將被乾燥物W由第1乾燥機1之排出機構5中的排出螺旋輸送機5a供給至連接機構6時，防止大氣(即第1載體氣體G1)流入連接機構6內之情形。由此，可以更進一步確實地防止此連接機構6及第2乾燥機2中的被乾燥物W的起火。 In particular, in the heat-drying apparatus of the present embodiment, the first and second carrier gases G1 and G2 are supplied to the first and second supply passages through the separate inlet passages of the individual draft fan 11 and the circulation fan 24, respectively. The second dryer 1, 2. Therefore, the first and second carrier gases G1 and G2 can be supplied to the first and second dryers 1 and 2 under different conditions. Therefore, the second carrier gas is supplied by, for example, a higher pressure than the first carrier gas G1. In the case of G2, when the object to be dried W is supplied from the discharge screw conveyor 5a in the discharge mechanism 5 of the first dryer 1 to the connection mechanism 6, the atmosphere (that is, the first carrier gas G1) can be prevented from flowing into the connection mechanism 6. The situation. Thereby, the ignition of the to-be-dried material W in the connection mechanism 6 and the 2nd dryer 2 can be prevented more reliably.
此外，在本實施形態中，由第2乾燥機2排出之第2載體氣體G2，在已藉由第2袋濾器21除塵並且已在冷卻塔23、25中除濕後，以加熱器26加熱以使其再次循環至第2乾燥機2。另一方面，供給至第1乾燥機1之第1載體氣體G1是由大氣中吸引，並且在此第1乾燥機1中隨著被乾燥物W之所蒸發出的液體成分而排出的第1載體氣體G1會在以第1袋濾器12除塵後釋放至大氣中。因此，可以謀求低氧濃度氣體(即第2載體氣體G2)的有效利用，並且可將第1載體氣體G1做成不需要除濕及加熱，而能夠謀求更進一步的運轉能量及運轉成本、設備成本的削減。 Further, in the present embodiment, the second carrier gas G2 discharged from the second dryer 2 is dehumidified by the second bag filter 21 and has been dehumidified in the cooling towers 23, 25, and then heated by the heater 26 to This is circulated to the second dryer 2 again. On the other hand, the first carrier gas G1 supplied to the first dryer 1 is sucked by the air, and is discharged first in the first dryer 1 with the liquid component evaporated by the object W to be dried. The carrier gas G1 is released into the atmosphere after being dusted by the first bag filter 12. Therefore, the low-oxygen concentration gas (that is, the second carrier gas G2) can be effectively utilized, and the first carrier gas G1 can be prevented from dehumidification and heating, and further operation energy, operation cost, and equipment cost can be achieved. The cut.
再者，第1、第2乾燥機1、2，也可以使其旋轉筒3內之加熱管所形成之熱傳面積及第1、第2載體氣體G1、G2之供給量彼此相等。又，因為在後段之第2乾燥機2上的乾燥是減速乾燥期而使液體成分(水分)之蒸發量變少，因此也可以例如使第2乾燥機2中的加熱管的熱傳面積比第1乾燥機1小，或是使供給至第2乾燥機2之第2載體氣體G2的供給量比供給至第1乾燥機1之第1載體氣體G1的供給量少。在此種情況下，即使是在使用了由低氧濃度氣體所形成之第2載體氣體G2之第2乾燥機2中的乾燥，也可以謀求其運轉能 量及運轉成本、設備成本的減少，從而在間接加熱乾燥裝置整體中也能夠謀求這些的能量及成本的進一步的減少，因而更有效率。 Further, the first and second dryers 1 and 2 may have the heat transfer area formed by the heating pipes in the rotary cylinder 3 and the supply amounts of the first and second carrier gases G1 and G2 equal to each other. In addition, since the drying of the second dryer 2 in the subsequent stage is a deceleration drying period and the evaporation amount of the liquid component (moisture) is reduced, for example, the heat transfer area of the heating pipe in the second dryer 2 can be made larger than that of the second dryer 2 1 The dryer 1 is small, or the supply amount of the second carrier gas G2 supplied to the second dryer 2 is smaller than the supply amount of the first carrier gas G1 supplied to the first dryer 1. In this case, even if the drying is performed in the second dryer 2 using the second carrier gas G2 formed of the low oxygen concentration gas, the operation performance can be improved. Since the amount, the running cost, and the equipment cost are reduced, it is possible to further reduce the energy and cost of the entire indirect heating and drying apparatus, and it is more efficient.
再者，在本實施形態中，是在第1乾燥機1中使第1載體氣體G1的流動相對於被乾燥物W之搬送方向形成為並流，在第2乾燥機2中是使第2載體氣體G2的流動相對於被乾燥物W之搬送方向形成為對流。然而，也可以在第1乾燥機1中使第1載體氣體G1之流動形成為對流，在第2乾燥機2中使第2載體氣體G2之流動形成為並流。不過，在第1乾燥機1中，藉由如本實施形態地形成並流，可以朝向進行被乾燥物W之乾燥的搬送方向來使第1載體氣體G1的含水率上升，而變得可進一步有效地防止起火等。又，在第2乾燥機中將第2載體氣體G2的流動形成為並流的情況中，在從第2乾燥機2中的成為第2載體氣體G2之出口的排出機構5開始的路徑上宜設置圖1中以符號29表示之集塵機。 In the first embodiment, in the first dryer 1, the flow of the first carrier gas G1 is formed in parallel with the direction in which the object W is to be conveyed, and in the second dryer 2, the second is made. The flow of the carrier gas G2 is convected with respect to the conveying direction of the object W to be dried. However, in the first dryer 1, the flow of the first carrier gas G1 may be convected, and in the second dryer 2, the flow of the second carrier gas G2 may be formed to be cocurrent. However, in the first dryer 1, by forming the cocurrent flow in the present embodiment, the water content of the first carrier gas G1 can be increased toward the transport direction in which the dried material W is dried, and the flow can be further increased. Effectively prevent fire, etc. In the case where the flow of the second carrier gas G2 is formed to cocurrent in the second dryer, the path from the discharge mechanism 5 serving as the outlet of the second carrier gas G2 in the second dryer 2 is preferably A dust collector indicated by reference numeral 29 in Fig. 1 is provided.
如以上所說明地，根據本發明，即使被乾燥物是劣質煤等之可燃性物質，也可以防止起火等而安全地進行乾燥。又，在第1乾燥機中不需要低氧濃度氣體之供給與循環的情形下，可以削減間接加熱乾燥裝置整體之運轉能量及運轉成本、設備成本，是既有效率又符合經濟效益的。 As described above, according to the present invention, even if the object to be dried is a combustible substance such as inferior coal, it is possible to prevent the fire from being safely dried. Further, in the case where the supply and circulation of the low oxygen concentration gas are not required in the first dryer, the operation energy, the operation cost, and the equipment cost of the entire indirect heating and drying device can be reduced, which is both efficient and economical.
1‧‧‧第1間接加熱型旋轉乾燥機 1‧‧‧1st indirect heating rotary dryer
2‧‧‧第2間接加熱型旋轉乾燥機 2‧‧‧2nd indirect heating rotary dryer
3‧‧‧旋轉筒 3‧‧‧Rotating cylinder
4‧‧‧供給機構 4‧‧‧Supply institutions
5‧‧‧排出機構 5‧‧‧Discharge agencies
5a‧‧‧排出螺旋輸送機 5a‧‧‧Draining screw conveyor
6‧‧‧連接機構 6‧‧‧Connecting institutions
7‧‧‧裝入筒 7‧‧‧Loading cylinder
8‧‧‧供給填裝機構 8‧‧‧Supply filling agency
9‧‧‧搬出機構 9‧‧‧ Moving out of the agency
11‧‧‧引風機 11‧‧‧ induced draft fan
12‧‧‧第1袋濾器 12‧‧‧1st bag filter
21‧‧‧第2袋濾器 21‧‧‧2nd bag filter
22、28‧‧‧低氧濃度氣體供給源 22, 28‧‧‧ Low oxygen concentration gas supply source
23、25‧‧‧冷卻塔 23, 25‧‧‧ Cooling tower
24‧‧‧循環風扇 24‧‧‧Circular fan
26‧‧‧加熱器 26‧‧‧heater
27‧‧‧閥 27‧‧‧Valves
29‧‧‧集塵機 29‧‧‧ dust collector
G1‧‧‧第1載體氣體 G1‧‧‧1st carrier gas
G2‧‧‧第2載體氣體 G2‧‧‧2nd carrier gas
W‧‧‧被乾燥物 W‧‧‧Dry objects
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