JP5746479B2 - Fluidized bed drying apparatus and fluidized bed drying method - Google Patents

Description

The present invention relates to a fluidized bed drying apparatus and a fluidized bed drying method for drying a wet processed product such as coal or ore while flowing.

  An example of a conventional fluidized bed drying apparatus is shown in FIG. 9 (see, for example, Patent Document 1). This fluidized bed drying apparatus 1 dries a wet raw material such as coal supplied from a supply chute 2 into a drying chamber 3 while flowing it with a high-temperature gas supplied into the drying chamber 3, and discharges the dry raw material into a discharge chute. 4 can be discharged.

  In the fluidized bed drying apparatus 1 shown in FIG. 9, a plurality of blowing nozzles 5 are provided in the supply chute 2, and high temperature gas is blown into the supply chute 2 from the plurality of blowing nozzles 5.

  The high-temperature gas blown from the blowing nozzle 5 into the supply chute 2 can reduce the amount of moisture contained in the wet raw material in the supply chute 2 to some extent, so that the wet raw material contains water. Therefore, it is possible to suppress adhesion or deposition on the inner surface of the supply chute 2.

  Thus, the wet raw material can be smoothly supplied from the supply chute 2 into the drying chamber 3 without being disturbed by the wet raw material adhering to or depositing on the inner surface of the supply chute 2.

JP 2006-232891 A

  However, in the conventional fluidized bed drying apparatus 1 shown in FIG. 9, the wet raw material may block the blowing nozzle 5 when the moisture content of the wet raw material increases and the adhesive force increases accordingly. When the blowing nozzle 5 is blocked, the high temperature gas is not blown into the supply chute 2 or the blowing amount is reduced, and the wet raw material adheres to or accumulates on the inner surface of the supply chute 2. In such a situation, the wet raw material cannot be smoothly supplied from the supply chute 2 into the drying chamber 3, and the operation of the fluidized bed drying apparatus 1 may be hindered or the operation may not be continued.

  In the conventional fluidized bed drying apparatus 1 shown in FIG. 9, it is possible to suppress the wet raw material from adhering to or depositing on the inner surface of the supply chute 2 to some extent. A wet raw material may adhere to and grow on the inner wall surface or the gas dispersion plate 6 in the vicinity, or the dispersion nozzle of the gas dispersion plate 6 may be blocked by the deposit. In such a case, the fluidity of the raw material in the drying chamber 3 decreases, and the operation of the fluidized bed drying apparatus 1 is hindered. Further, if the fluidization of the raw material is stopped in a wide range of the drying chamber 3 due to the high moisture content raw material, the operation may not be continued.

  The present invention has been made to solve the above-described problems, and even when wet processed products having a high moisture content or wet processed products having different moisture contents are supplied, such wet processed products can be stabilized. It is an object of the present invention to provide a fluidized bed drying apparatus and a fluidized bed drying method that can be continuously dried.

The fluidized bed drying apparatus according to the present invention is configured to dry a wet processed material, such as coal or ore, supplied from a supply port into a drying chamber while flowing with a high-temperature gas supplied into the drying chamber. In the fluidized bed drying apparatus for discharging exhaust gas containing the processed dry fine powder from the gas discharge port and discharging the dry coarse-grain processed product from the discharge port, the wet processed product supplied from the supply port to the drying chamber In addition, a mixed wet processed product obtained by mixing the dried coarse-grain processed product taken out from the take- out port provided separately from the discharge port in the drying chamber is supplied from the supply port into the drying chamber. It is characterized by this.

  According to the fluidized bed drying apparatus according to the present invention, when the mixed wet processed product obtained by mixing the wet coarse processed product with the wet processed product is supplied into the drying chamber from the supply port, the mixed wet processed product is Drying can be performed while flowing with the high-temperature gas supplied into the drying chamber, and the dried coarse-grain processed product can be discharged from the discharge port. And the high temperature gas supplied in a drying chamber can be discharged | emitted as a waste gas from a gas discharge port part, and the dry fine powder processed material contained in this waste gas can also be discharged | emitted from a gas discharge port part.

  In addition, a wet mixed product obtained by mixing a wet processed product with a dry coarse-grain processed product to reduce the moisture content is supplied from the supply port into the drying chamber. Even when wet processed products of different sizes are supplied to the supply port, the desired moisture content can be adjusted by adjusting or setting the ratio of the dry coarse-grain processed product to be mixed with the wet processed product before or during the operation. A mixed wet processed product can be made. Further, the mixed wet processed product having such a desired moisture content includes the inner surface of the supply port portion, the inner wall surface in the vicinity of the supply port portion in the drying chamber, the inner wall surface downstream of the supply port portion, and the gas dispersion. It is possible to prevent adhesion and deposition on the upper surface of the plate and further blockage of the dispersion nozzle formed on the gas dispersion plate.

  In the fluidized bed drying apparatus according to the present invention, at least one of the wet processed products is mixed with the dry coarse-grain processed product by using one mixing device, or two or more mixing devices are installed. A mixed wet processed product can be made by mixing using the above mixing apparatus, and the mixed wet processed product can be supplied into the drying chamber from the supply port.

  If it does in this way, the mixed wet processed material by which the wet processed material and the dry coarse-grain processed material were disperse | distributed substantially uniformly by the mixing apparatus can be made. And, such a mixed wet processed product can be reliably prevented from adhering to and depositing on the inner surface of each of the supply port portion and the drying chamber and the surface of the gas dispersion plate due to moisture contained therein, It is possible to reliably prevent clogging of the dispersion nozzle formed on the gas dispersion plate. Therefore, the fluidized bed drying apparatus can be continuously operated stably without stopping.

  Then, at least one mixing device of two or more mixing devices is used to make a mixed wet processed product by mixing the wet coarse processed product with the wet processed product. It is economical because it is possible to use another mixing device that is not in use when maintaining and inspecting the mixing device that is in use, and this fluidized bed drying device can be operated continuously without being stopped. .

  Further, since the mixing device is installed outside the drying chamber, maintenance and inspection work of the mixing device can be easily performed.

In the fluidized bed drying apparatus according to the present invention, since the dried coarse-grain processed product is taken out from the drying chamber, the transport time from when the dried coarse-grain processed product is taken out from the drying chamber to the feed port is increased. The dry coarse-grain processed product taken out from the drying chamber can be shortened, and the amount of heat radiated from the time it is taken out until it is mixed with the wet processed product and supplied from the supply port to the drying chamber is It is slight. This can reduce a decrease in thermal efficiency of the fluidized bed drying apparatus.

In a fluid bed drying apparatus according to the present invention, the drying chamber of a drying coarse treated, removed from the outlet portion, can be made to convey to the supply port or the mixing apparatus by a conveying means.

  If it does in this way, the thermal efficiency of this fluidized bed drying apparatus can be improved with simple composition and low cost.

The fluidized bed drying method according to the present invention supplies a wet processed product, which is a loose product such as coal or ore, into a drying chamber from a supply port, and supplies the wet processed product supplied into the drying chamber into the drying chamber. In the fluidized bed drying method in which the exhaust gas containing the dried fine powder processed product is discharged from the gas discharge port portion and the dried coarse-grain processed product is discharged from the discharge port portion while being fluidized by the high temperature gas to be discharged from the supply port portion. A mixed wet processed product obtained by mixing the wet processed product supplied into the drying chamber with the dried coarse-grain processed product taken out from the discharge port provided separately from the discharge port in the drying chamber , It supplies to the said drying chamber from a supply port part, It is characterized by the above-mentioned.

  According to the fluidized bed drying method according to the present invention and the fluidized bed drying method described below, the fluidized bed drying device according to the present invention operates in the same manner.

  In the fluidized bed drying method according to the present invention, at least one of the wet processed material is mixed with the dried coarse-grain processed material using one mixing device, or two or more mixing devices are installed. A mixed wet processed product can be made by mixing using the above mixing apparatus, and the mixed wet processed product can be supplied into the drying chamber from the supply port.

In fluidized bed drying method according to the present invention, the drying chamber of a drying coarse treated, removed from the outlet portion, can be made to convey to the supply port or the mixing apparatus by a conveying means.

  According to the fluidized bed drying apparatus and the fluidized bed drying method of the present invention, the mixed wet processed product in which the wet coarse processed product is mixed with the wet processed product to reduce the water content is supplied from the supply port into the drying chamber. Therefore, it is possible to prevent the mixed wet processed product from adhering to and depositing on the supply port of the fluidized bed drying device, the inner wall surface of the drying chamber, and the surface of the gas dispersion plate due to moisture contained therein. Furthermore, it is possible to prevent the dispersion nozzle formed on the gas dispersion plate from being blocked.

  Therefore, even when a wet processed product with a high moisture content or a wet processed product with a different moisture content is supplied into the drying chamber from the supply port, such a wet processed product can be stably and continuously dried. .

It is a block diagram for demonstrating the fluid bed drying apparatus which concerns on this invention. It is another block diagram for demonstrating the fluid bed drying apparatus which concerns on the same invention. It is a front lineblock diagram showing the fluidized bed drying device concerning a 1st embodiment of the invention. It is a side block diagram which shows the fluidized bed dryer of the fluidized bed drying apparatus which concerns on the same 1st Embodiment. It is a side block diagram which shows the fluidized-bed dryer of the other example of the fluidized-bed drying apparatus which concerns on the 1st Embodiment. It is a front block diagram which shows the fluidized bed drying apparatus which concerns on 2nd Embodiment of the same invention. It is a front block diagram which shows the fluidized bed drying apparatus which concerns on 3rd Embodiment of the same invention. It is a front block diagram which shows the fluid bed dryer of the fluid bed dryer which concerns on 4th Embodiment of the same invention. It is a front block diagram which shows the conventional fluidized bed drying apparatus.

  Hereinafter, the concept of the fluidized bed drying apparatus according to the present invention and the fluidized bed drying method used in the apparatus will be described with reference to FIGS. 1 and 2.

  A fluidized bed drying apparatus 11 shown in FIG. 1 includes a fluidized bed dryer 12 and a dried coarse-grain processed product hopper 13. The fluidized bed dryer 12 is a high-temperature gas supplied from a wet processing product (moisture content of, for example, 10% or less) such as coal (for example, coke raw material) supplied from a supply port 14 into the drying chamber. The dried coarse-grain processed product (moisture content is, for example, 5% or less) having a small water content can be discharged from the discharge port 15 by being dried while being fluidized (for example, 150 to 250 ° C.).

  And although not shown in a figure, the high temperature gas supplied in a drying chamber can be discharged | emitted from a gas discharge port part as waste gas containing a dry fine powder processed material.

  The dry coarse-grain processed product hopper 13 can store the dry coarse-grain processed product discharged from the fluidized bed dryer 12, and the stored dry coarse-grain processed product is conveyed to the subsequent stage. .

  Here, when the moisture content of the wet processed product supplied from the supply port 14 into the drying chamber exceeds 10%, the wet processed product having such a moisture content is converted into a fluidized bed drying device by the moisture contained therein. 11 may adhere to or accumulate on the inner supply wall 14 of the drying chamber 11 and the inner wall surface of the drying chamber or the surface of the gas dispersion plate, and may further block the dispersion nozzle formed on the gas dispersion plate.

  Therefore, when a wet processed product having a high moisture content or a wet processed product having a different moisture content is supplied from the supply port 14 into the drying chamber, such a wet processed product can be stably and continuously dried. It may disappear.

  Therefore, according to the present invention, as shown in FIG. 1, for example, the dried coarse-grain processed product obtained by drying with the fluidized bed drying device 11 can be directly returned to the supply port 14 of the fluidized bed dryer 12. Or, it is returned to the supply port 14 by returning to a supply machine such as a belt conveyor.

  That is, before supplying the wet processed product into the drying chamber of the fluidized bed dryer 12, the wet processed product is mixed with the dry coarse processed product to make a mixed wet processed product having a reduced moisture content. Items are supplied from the supply port 14 into the drying chamber.

  Accordingly, even when a wet processed product having a high moisture content or a wet processed product having a different moisture content is supplied to the supply port 14, the ratio of the dry coarse processed product to be mixed with the wet processed product is determined before or after the operation. By adjusting or setting in, a mixed wet processed product having a desired moisture content can be produced. And the mixed wet processed product having such a desired moisture content is the inner surface of the supply port portion 14, the inner wall surface in the vicinity of the supply port portion 14 in the drying chamber, and the inner wall surface on the downstream side thereof, and It is possible to prevent adhesion and deposition on the upper surface of the gas dispersion plate and further blockage of the dispersion nozzle formed on the gas dispersion plate, and the wet processed product can be dried stably and continuously.

  As shown in FIG. 1, as a method for returning the dried coarse-grain processed product obtained by drying with the fluidized bed dryer 11 to the supply port 14 of the fluidized bed dryer 12, the inside of the fluidized bed dryer 12 is used. The dried coarse-grain processed product is taken out from the outlet 16 provided in the fluidized bed dryer 12 and returned to the supply port 14, and the dried coarse-grained processed product in the fluidized bed dryer 12 is converted into the fluidized bed. A method K2 that is taken out from the discharge port 15 provided in the dryer 12 and returned to the supply port 14; a method K3 that takes the dried coarse particle processed product in the dried coarse particle processed product hopper 13 and returns it to the supply port 14; However, there is a method of returning the dry coarse-grain processed product separately stored to the supply port 14.

  Moreover, it is preferable to determine the ratio which mixes a dry coarse-grain processed material (weight G2) with a wet processed material (weight G1) according to the moisture content S1 of a wet processed material. For example, when the moisture content S1 of the wet processed product is 14% and the moisture content S2 of the dry coarse-grain processed product is 5%, the mixed wet processed product is assumed to have a mixing ratio of weight G1: weight G2 = 1: 2. The water content S3 is (14% + 5% × 2) ÷ 3 = 8%.

  Therefore, when a wet processed product having a moisture content S1 of 14% is supplied to the supply port 14, the wet processed product is likely to adhere to or accumulate on the inner surface of the supply port 14, but as described above. When the moisture content S3 is supplied to the supply port 14 as a mixed wet processed product having an moisture content S3 of 8%, the above-described problem can be prevented from occurring.

  Note that, as described above, the dry coarse-grain processed product is mixed with the wet-processed product, but the weight of water removed by drying is mixed with the case where the dry coarse-grain processed product is mixed as described above. In both cases, the same is true. Therefore, the above-described problems can be prevented from occurring without increasing the heat energy required for drying.

  FIG. 2 shows another fluidized bed drying device 17. The fluidized bed drying device 17 shown in FIG. 2 is different from the fluidized bed drying device 11 shown in FIG. 1 in the fluidized bed drying device 11 shown in FIG. The flow shown in FIG. 2 is returned to the supply port 14 of 12 directly, or returned to the supply port 14 by the supply machine (not shown) such as a supply conveyor. In the layer drying device 17, the dry coarse-grain processed product is mixed with the wet processed product using the mixing device 18 to make a mixed wet-processed product with a reduced water content, and the mixed wet-processed product is supplied to the supply port 14. To be fed into the fluidized bed dryer 12. Other than this, it is equivalent to the fluidized bed drying apparatus 11 shown in FIG.

  In this way, the mixing device 18 can make a mixed wet processed product in which the wet processed product and the dry coarse processed product are dispersed almost uniformly, and such a mixed wet processed product is included in the mixed wet processed product. It is possible to reliably prevent the moisture from adhering to and depositing on the inner surfaces of the supply port portion 14 and the drying chamber and the surface of the gas dispersion plate.

  In other words, in the mixed wet processed product in which the wet processed product and the dry coarse processed product are dispersed substantially uniformly, the moisture contained in the wet processed product adheres to or is absorbed by the dry coarse processed product. The moisture content as a whole of the processed product can be reduced, and adhesion due to moisture can be reduced.

  In the present invention, the wet processed product is mixed with the dried coarse processed product to make a mixed wet processed product with a reduced moisture content, but instead, the dried fine powder processed product contained in the exhaust gas is used. It is conceivable to produce a mixed wet processed product having a reduced water content by mixing with the wet processed product.

  However, when the dry fine powder processed product contained in the exhaust gas is collected by a solid-gas separator such as a cyclone, the dry fine powder processed product is mixed with the wet processed product and returned to the fluidized bed dryer 12. Therefore, it is necessary to control so that only a part of the dried fine powder processed product is returned to the fluidized bed dryer 12, and such control is not preferable because it requires a large amount of equipment and increases costs.

  Therefore, in the present invention, the wet processed product is mixed with the dry coarse processed product to make a mixed wet processed product.

  In addition, it is necessary to control so that only a part of the dried fine powder processed product collected by the solid-gas separator is returned to the fluidized bed dryer 12. This is because the flow rate of the dried fine powder processed product circulating between the solid-gas separator and the fluidized bed dryer 12 increases, and stable control becomes difficult.

  Next, the fluidized bed drying apparatus 20 according to the first embodiment of the present invention and the fluidized bed drying method used in the apparatus 20 will be described with reference to FIGS. The fluidized bed drying device 20 includes a fluidized bed dryer 21 as shown in FIG. As shown in FIG. 3, the fluidized bed dryer 21 includes a first drying chamber 22 on the left side (upstream side) and a second drying chamber 23 on the right side (downstream side). The first drying chamber 22 and the second drying chamber 23 are partitioned by a partition plate 24 provided in the vertical direction. On the upstream side of the first drying chamber 22, a supply pipe 25 (supply port) for supplying the wet processed material to the first drying chamber 22 is provided, and on the downstream side of the second drying chamber 23. In addition, a discharge pipe 26 (discharge port portion) for discharging the dry coarse-grain processed product from the second drying chamber 23 is provided.

  A gas dispersion plate 27 is provided substantially horizontally below the partition plate 24. The gas dispersion plate 27 is formed with, for example, a large number of small holes (dispersion nozzles 27a). A communication passage 28 capable of adjusting the opening area is formed between the lower end portion of the partition plate 24 and the upper surface of the gas dispersion plate 27.

  As shown in FIG. 3, a first air box 29 is provided below the first drying chamber 22 with a gas dispersion plate 27 interposed therebetween, and a gas distribution plate is provided below the second drying chamber 23. A second wind box 30 is provided with 27 therebetween. Hot air (hot gas) is supplied from the blower 31 through the hot air introduction pipe 32 to the first and second wind boxes 29 and 30. The hot air supplied to the first and second wind boxes 29 and 30 is blown into the first and second drying chambers 22 and 23 from a number of the dispersion nozzles 27 a of the gas dispersion plate 27, and then on the gas dispersion plate 27. The mixed wet processed material constituting the fluidized bed 33 can be fluidized and dried.

  That is, as shown in FIG. 3, when the mixed wet processed product in which the wet processed product and the dry coarse processed product are mixed is supplied from the supply pipe 25 into the first drying chamber 22, the mixed wet processed product is provided. Is dried while flowing by hot air (high-temperature gas) blown from the gas dispersion plate 27, and moves to the second drying chamber 23 on the downstream side through the communication passage 28. Then, the mixed wet processed product that has been dried is dried while flowing in the second drying chamber 23 by the hot air blown from the gas dispersion plate 27, and passes through the discharge pipe 26 and the rotary valve 34 as a dry coarse processed product. Then, it is transferred to the first transport conveyor 35 and transported to the subsequent stage by the first transport conveyor 35.

  In addition, 36 shown in FIG. 3 is a 2nd conveyance conveyor (for example, screw conveyor). The second transfer conveyor 36 is for transferring the processed material spilled from the dispersion nozzle 27 a of the gas distribution plate 27 to the first transfer conveyor 35. Reference numeral 38 denotes a valve. The valve 38 is, for example, a rotary valve that can discharge a processed material in a state in which the discharge port of the second conveyor 36 and the outside are hermetically sealed.

  Next, with reference to FIG. 3, the process of the waste gas containing the dry fine powder processed material generated by drying the fluidized bed 33 in the first and second drying chambers 22 and 23 will be described. The exhaust gas containing the processed dry fine powder in the first and second drying chambers 22 and 23 is a gas exhaust port 39 and a gas exhaust pipe 40 (gas exhaust port portion) provided in the upper portions of the respective drying chambers 22 and 23. And is transferred to a solid-gas separator 41 (for example, a cyclone or a bag filter). Then, the dried fine powder processed product collected by the solid-gas separator 41 is transferred to the first transport conveyor 35 through the rotary valve 42 and transported to the subsequent stage by the first transport conveyor 35. Further, the exhaust gas from which the dry fine powder processed product has been removed is blown by the blower 43 and processed.

  And as shown in FIG. 3, it becomes the structure by which a hot air (high temperature gas) is supplied also to the upper part in the 1st drying chamber 22, Thereby, the fine powder processed material generated in the 1st drying chamber 22 is comprised. It can be surely dried. That is, one end of the branch hot air pipe 44 is connected to the upper part of the first drying chamber 22, and the other end of the branch connection pipe 44 is connected to the hot air supply pipe 32.

  Next, referring to FIG. 3 to FIG. 5, a processed product return mechanism 45 that takes out a predetermined amount of the dried coarse-grain processed product from the second drying chamber 23 and returns the dried coarse-grain processed product to the supply pipe 25. explain. The processed product return mechanism 45 is for taking out a part of the dried coarse-grain processed product in the second drying chamber 23 and returning it to the supply pipe 25. As a result, the wet processed product supplied from the supply pipe 25 into the first drying chamber 22 can be mixed with a predetermined amount of the dry coarse processed product to make a mixed wet processed product with a reduced moisture content. The mixed wet processed product can be supplied from the supply pipe 25 into the first drying chamber 22.

  FIG. 4 is a cross-sectional view of the second drying chamber 23 of the fluidized bed dryer 21 as viewed from the side. As shown in FIG. 4, the upper end portion of the take-out pipe 46 (take-out port portion) is connected to the front wall portion of the second drying chamber 23. An extraction port 46 a formed by the upper end portion of the extraction pipe 46 is formed in, for example, a substantially rectangular shape, and the lower edge portion of the extraction port 46 a substantially coincides with the upper surface of the gas dispersion plate 27. For example, a rotary valve 47 is provided at the lower end portion of the take-out pipe 46, and is connected to the third transport conveyor 37 via the valve 47. The downstream end of the third transport conveyor 37 is connected to the inlet of the supply pipe 25.

  FIG. 5 shows an example in which the position of the take-out port 46a formed in the second drying chamber 23 is provided above the upper surface of the gas dispersion plate 27 with a space therebetween. In this way, the front wall portion formed below the take-out port 46a can function as the weir 48, and the upper layer portion (relatively processed product) of the fluidized bed 33 (dried coarse particle processed product) on the gas dispersion plate 27 A dried coarse-grain processed product having a small particle size) flows over the weir 48 and is introduced into the take-out pipe 46. Other than this, it is the same as the workpiece return mechanism 45 shown in FIGS.

  Next, the usage method and operation of the fluidized bed drying apparatus 20 configured as described above and the fluidized bed drying method will be described. According to the fluidized bed drying apparatus 20 shown in FIG. 3, the mixed wet processed product obtained by mixing the dried coarse-grain processed product with the wet processed product such as coal or ore is supplied from the supply pipe 25 to the first drying chamber 22. When supplied to the inside, the mixed wet processed material is dried while flowing by the hot air blown from the gas dispersion plate 27, and moves to the second drying chamber 23 on the downstream side through the communication passage 28. Then, the mixed wet processed product that has been dried is dried while flowing in the second drying chamber 23 by the hot air blown from the gas dispersion plate 27, and the discharge pipe 26 and the rotary valve 34 are provided as a dry coarse processed product. The first transport conveyor 35 passes through and is transported to the subsequent stage by the first transport conveyor 35.

  And the high temperature gas supplied in the 1st and 2nd drying chambers 22 and 23 can be discharged | emitted from the gas discharge pipe 40 as waste gas, and the dry fine powder processed material contained in this waste gas is also discharged | emitted from the gas discharge pipe 40. can do.

  In addition, according to the fluidized bed drying apparatus 20, the mixed wet processed product obtained by mixing the wet processed product with the dry coarse processed product to reduce the water content is supplied from the supply pipe 25 into the first drying chamber 22. Therefore, even when a wet processed product having a high water content or a wet processed product having a different water content is supplied to the supply pipe 25, the ratio of the dry coarse processed product to be mixed with the wet processed product is determined before or during the operation. By adjusting or setting, a mixed wet processed product having a desired moisture content can be produced. The mixed wet processed product having such a desired moisture content includes the inner surface of the supply pipe 25, the inner wall surface of the first drying chamber 22 in the vicinity of the supply pipe 25, and the first and first downstream sides. 2 It is possible to prevent adhesion and deposition on the inner wall surfaces of the drying chambers 22 and 23 and the upper surface of the gas dispersion plate 27, and further to block the dispersion nozzle 27a formed on the gas dispersion plate 27.

  Therefore, even when wet processed products having a high moisture content or wet processed products having different moisture contents are supplied from the supply pipe 25 into the drying chamber, such wet processed products can be stably and continuously dried. .

  In addition, it can carry out by changing the rotational speed of the rotary valve 47 shown, for example in FIG. 4 or FIG. 5 as a method of adjusting the ratio of the dry coarse-grain processed material mixed with a wet processed material. The rotary valve 47 is, for example, provided with a rotating partition part that forms a plurality of fan-shaped rooms inside a fixed cylindrical part in which an inlet and an outlet are formed.

  In the fluidized bed drying apparatus 20 shown in FIG. 3, the dry coarse-grain processed product that is mixed with the wet processed product and supplied from the supply pipe 25 into the first drying chamber 22 is taken out from the second drying chamber 23. It is supposed to be.

  In this way, it is possible to shorten the transport time from when the dried coarse-grain processed product is taken out from the second drying chamber 23 to when it is transported to the supply pipe 25, and it is taken out from the second drying chamber 23. The dried coarse-grain processed product has a small amount of heat released from the time it is taken out until it is mixed with the wet processed product and supplied from the supply pipe 25 into the drying chamber. Thereby, the fall of the thermal efficiency of this fluidized bed drying apparatus 20 can be reduced.

  Moreover, in the fluidized-bed drying apparatus 20 shown in FIGS. 3-5, the dry coarse-grain processed material in the 2nd drying chamber 23 is taken out from the taking-out opening 46a provided in this 2nd drying chamber 23, and 3rd conveyance is carried out. It is assumed to be conveyed to the supply pipe 25 by the conveyor 37.

  If it does in this way, the thermal efficiency of this fluidized-bed drying apparatus 20 can be improved with a simple structure and little expense.

  Next, a fluidized bed drying apparatus 50 according to a second embodiment of the present invention and a fluidized bed drying method used in the apparatus 50 will be described with reference to FIG. The difference between the second embodiment shown in FIG. 6 and the first embodiment shown in FIG. 3 is that, in the first embodiment shown in FIG. 3, the dried coarse-grain processed product taken out from the second drying chamber 23 is used. In the second embodiment shown in FIG. 6, while being conveyed by the third conveyor 37 and directly supplied to the inlet of the supply pipe 25, the wet processed product is also supplied directly to the inlet of the supply pipe 25. Then, the dried coarse-grain processed product taken out from the second drying chamber 23 is transported by the third transport conveyor 37 and is transferred to a supply machine 51 (for example, a belt conveyor). At the same time as being supplied, the wet processed product is also transferred to the supply machine 51 and supplied to the inlet of the supply pipe 25 by this supply machine 51.

  Other than this, the configuration is the same as that of the first embodiment and operates in the same manner. Therefore, the equivalent parts are denoted by the same reference numerals and the description thereof is omitted.

  If it does in this way, the wet processed material and dry coarse-grain processed material sent to the supply machine 51 will be disperse | distributed to some extent uniformly on this supply machine 51, and will become a mixed wet processed material. Such a mixed wet processed product adheres to the supply pipe 25 and the inner surfaces of the first and second drying chambers 22 and 23 and the surface of the gas dispersion plate 27 depending on the moisture contained therein. Accumulation can be prevented more reliably than in the first embodiment, and the dispersion nozzle 27a formed on the gas dispersion plate 27 can be prevented from being blocked, so that the fluidized bed drying apparatus 50 can be continuously stopped without stopping. It is possible to drive stably.

  Next, a fluidized bed drying apparatus 53 according to a third embodiment of the present invention and a fluidized bed drying method used in the apparatus 53 will be described with reference to FIG. The difference between the third embodiment shown in FIG. 7 and the second embodiment shown in FIG. 6 is that, in the second embodiment shown in FIG. 6, the dried coarse-grain processed product taken out from the second drying chamber 23, In the third embodiment shown in FIG. 7, the dry coarse particles taken out from the second drying chamber 23 are supplied to the inlet of the supply pipe 25 by the supply device 51 such as a belt conveyor. The processed product and the wet processed product are being supplied to the inlet of the supply pipe 25 by a mixing device 54 (for example, a paddle type mixing device, a screw type mixing device, or a rotary drum type mixing device).

  Other than this, the configuration is the same as that of the second embodiment and operates in the same manner. Therefore, the equivalent parts are denoted by the same reference numerals and the description thereof is omitted.

  If it does in this way, the wet processed material and dry coarse particle processed material sent to the mixing apparatus 54 will be disperse | distributed more uniformly than 2nd Embodiment, and will become a mixed wet processed material. Such a mixed wet processed product adheres to or accumulates on the inner surfaces of the supply pipe 25 and the first and second drying chambers 22 and 23 and the surface of the gas dispersion plate 27 depending on the moisture contained therein. Can be prevented more reliably than in the second embodiment, and it is possible to prevent the dispersion nozzle 27a formed in the gas dispersion plate 27 from being blocked, so that the fluidized bed drying device 53 can be continuously stopped without stopping. It is possible to drive stably.

  However, in the fluidized bed drying apparatus 53 shown in FIG. 7, a mixed wet processed product is produced by mixing a wet coarse processed product with a wet coarse processed product using one mixing device 54, and supplying the mixed wet processed product. Although it supplied into the 1st drying chamber 22 from the pipe | tube 25, instead of this, it mixes by installing two or more mixing apparatuses 54, and mixing using at least one or more mixing apparatuses 54 of them. A wet processed product may be made, and the mixed wet processed product may be supplied from the supply pipe 25 into the first drying chamber 22.

  In this way, for example, when the mixing device 54 being used is inspected and maintained, another mixing device 54 that is not in use can be used, and this fluidized bed drying device can be continuously stopped without stopping. It can be driven and is economical. Further, since the mixing device 54 is installed outside the first and second drying chambers 22 and 23, maintenance and inspection work of the mixing device 54 can be easily performed.

  Next, a fluidized bed drying apparatus 56 according to a fourth embodiment of the present invention and a fluidized bed drying method used in the apparatus 56 will be described with reference to FIG. However, FIG. 8 shows only the fluidized bed dryer 21 constituting the fluidized bed drying device 56. The difference between the fourth embodiment shown in FIG. 8 and the first embodiment shown in FIG. 3 is that, in the first embodiment shown in FIG. 3, the take-out pipe 46 forms the second drying chamber 23 in the front wall. In the fourth embodiment shown in FIG. 8, the discharge pipe 26 is provided at the downstream end of the second drying chamber 23, whereas the discharge pipe 26 is provided at the downstream end of the second drying chamber 23. The discharge pipe 26 is provided at a position further downstream than the take-out pipe 46.

  Other than this, the configuration is the same as that of the first embodiment and operates in the same manner. Therefore, the equivalent parts are denoted by the same reference numerals and the description thereof is omitted.

  If it does in this way, the fully dried dry coarse-grain processed material in the 2nd drying chamber 23 can be taken out and returned to the supply pipe | tube 25, and the water content of a mixing wet processed material can be made small effectively.

  However, in the said embodiment, as shown in FIG. 3 etc., although it was set as the two-chamber type provided with the 1st and 2nd drying chambers 22 and 23, it replaces with this and is equipped with one room type or three or more rooms. It may be a thing.

  In the above embodiment, a cooling chamber may be further provided on the downstream side of the second drying chamber 23, or a cooling chamber may be used instead of the second drying chamber 23. This cooling chamber can cool the discharged coarse-grain processed product so that the dried coarse-grain processed product can be easily handled.

  As described above, the fluidized bed drying apparatus and the fluidized bed drying method according to the present invention stabilizes such a wet processed product even when a wet processed product having a high water content or a wet processed product having a different water content is supplied. Thus, it has an excellent effect of being continuously dried, and is suitable for application to such a fluidized bed drying apparatus and fluidized bed drying method.

DESCRIPTION OF SYMBOLS 11 Fluidized bed dryer 12 Fluidized bed dryer 13 Dried coarse-grain processed product hopper 14 Supply port 15 Discharge port 16 Extraction port 17 Fluidized bed dryer 18 Mixing device 20 Fluidized bed dryer 21 Fluidized bed dryer 22 1st Drying chamber 23 Second drying chamber 23a Front wall 24 Partition plate 25 Supply pipe 26 Discharge pipe 27 Gas dispersion plate 27a Dispersion nozzle 28 Communication passage 29 First wind box 30 Second wind box 31, 43 Blower 32 Hot air introduction pipe 33 Flow Layers 34, 38, 42, 47 Valves 35 First transport conveyor 36 Second transport conveyor 37 Third transport conveyor 39 Gas discharge port 40 Gas discharge pipe 41 Solid gas separator 44 Branch hot air pipe 45 Process return mechanism 46 Extraction pipe 46a Take-out port 48 Weir 50 Fluidized bed dryer 51 Feeder 53 Fluidized bed dryer 54 Mixer 56 Fluidized bed dryer

Claims (6)

A wet treated product such as coal or ore supplied from the supply port to the drying chamber is dried while flowing with a high-temperature gas supplied to the drying chamber, and an exhaust gas containing the dried fine powder treated product is gasified. In the fluidized bed drying apparatus that discharges from the discharge port and discharges the dried coarse-grain processed product from the discharge port
Mixed wetness obtained by mixing the wet processed product supplied from the supply port into the drying chamber and the dried coarse-grain processed product taken out from the discharge port provided separately from the discharge port in the drying chamber A fluidized bed drying apparatus for supplying a processed product into the drying chamber from the supply port.   Mix the wet coarse product with the dry coarse product using one mixing device, or install two or more mixing devices and mix using at least one of them. The fluidized bed drying apparatus according to claim 1, wherein a mixed wet processed product is produced by supplying the mixed wet processed product into the drying chamber from the supply port. 3. The fluidized bed drying apparatus according to claim 1, wherein the dried coarse-grain processed product in the drying chamber is taken out from the take-out port and is transported to the supply port or the mixing device by a transport unit. A wet processed material, such as coal or ore, is supplied into the drying chamber from the supply port, and the wet processed material supplied into the drying chamber is dried while flowing with the high-temperature gas supplied into the drying chamber. In the fluidized bed drying method of exhausting exhaust gas containing dried fine powder processed product from the gas outlet and discharging the dried coarse-grain processed product from the outlet,
Mixed wetness obtained by mixing the wet processed product supplied from the supply port into the drying chamber and the dried coarse-grain processed product taken out from the discharge port provided separately from the discharge port in the drying chamber A fluidized bed drying method, wherein a processed product is supplied into the drying chamber from the supply port.   Mix the wet coarse product with the dry coarse product using one mixing device, or install two or more mixing devices and mix using at least one of them. 5. The fluidized bed drying method according to claim 4, wherein a mixed wet processed product is produced by supplying the mixed wet processed product into the drying chamber through the supply port. The fluidized-bed drying method according to claim 4 or 5, wherein the dried coarse-grain processed product in the drying chamber is taken out from the take-out port and transported to the supply port or the mixing device by a transport unit.

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