JP2012215316A - Fluidized bed drying device, fluid bed drying facility and wet raw material drying method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluidized bed drying device, a fluidized bed drying facility and a fluidized bed drying method for uniformly drying wet raw materials input to the neighborhood of an input area while suppressing the wet raw materials from being occluded.SOLUTION: This fluidized bed drying device includes: a drying container including a drying room and a chamber room; an input part; a discharger; a gas dispersion plate formed with a through-hole through which gas can be supplied from the chamber room to the drying room; a fluidized gas supply part for supplying fluidized gas forming a fluidized bed with wet raw materials in the drying room to the chamber room; a vapor discharge part for discharging generated vapor to be generated when the wet raw materials of the fluidized bed formed according to the supply of the fluidized gas is dried from the upper part of the drying container; and a rotary part arranged in an area at the input part side among areas in which the fluidized bed of the drying room is formed, and equipped with a shaft extended to the width direction of the drying container, a branch part connected to the shaft, and extended to a direction away from the shaft and a driving part for rotating the shaft, and characterized such that the shaft rotates as a rotary shaft.

Description

  The present invention relates to a fluidized bed drying apparatus, a fluidized bed drying facility, and a wet raw material drying method for drying while flowing a wet raw material.

  For example, a combined coal gasification power generation facility is a power generation facility that aims to further increase the efficiency and environmental performance compared to conventional coal-fired power generation by gasifying coal and combining it with combined cycle power generation. This coal gasification combined power generation facility is also known to be able to use coal with abundant resources, and it is known that applicable coal types can be expanded.

  In such a coal gasification combined power generation facility, when brown coal (wet raw material) is used as a fuel, a large amount of water is brought into the gasification furnace, and the temperature inside the gasification furnace decreases due to the latent heat of vaporization of the water. Power generation efficiency will decrease. In order to use high moisture coal, it is necessary to provide a fluidized bed dryer, dry the coal with this fluidized bed dryer to remove moisture, and then pulverize and supply it to the coal gasifier.

  Conventionally, such a fluidized bed drying apparatus for drying an object to be dried such as lignite has a drying chamber which is a breathable dispersion plate having a plurality of openings at the bottom, and a chamber chamber located at the lower portion of the drying chamber. ing. That is, in this fluidized bed drying apparatus, a fluidized gas (drying gas) is supplied from a wind box to a drying chamber through a perforated plate to dry the material to be dried while flowing (Patent Document 1).

JP 2008-89243 A

  By the way, the material put into the fluidized bed drying apparatus is a wet raw material containing a lot of moisture. For this reason, the wet raw material that has not been dried immediately after the addition tends to stay or settle. If the wet raw material stays or settles in the fluidized bed drying apparatus, there is a possibility that the flow of the material to be dried may occur in some areas. If poor flow occurs in a part of the region, the wet raw material moves to the next region without being dried, and thus there is a risk that sufficient drying cannot be performed. In addition, there is a possibility that the dry state of the wet raw material may be non-uniform, and once the flow failure occurs, the heat transfer behavior inside the drying apparatus is lowered.

  Accordingly, the present invention provides a fluidized bed drying apparatus, a fluidized bed drying facility, and a wet raw material drying method capable of uniformly drying a wet raw material while suppressing the clogging of the wet raw material charged near the charging region. The task is to do.

  The fluidized bed drying apparatus of the present invention includes a drying container provided with a drying chamber in which a wet raw material is dried and a chamber chamber provided below the drying chamber, and the wet raw material is introduced into one end of the drying container. A gas disperser in which a charging unit, a discharge unit for discharging a dry product obtained by heating and drying a wet raw material from the other end of the drying container, and a through-hole capable of supplying gas from the chamber chamber to the drying chamber are formed A plate, a fluidizing gas supplying a fluidizing gas that forms a fluidized bed with a wet raw material in the drying chamber, and the wetting of the fluidized bed formed by supplying the fluidizing gas. A steam discharge section for discharging generated steam generated by drying the raw material from above the drying container; and a rotating section for stirring the fluidized bed in the drying chamber, wherein the fluidized bed in the drying chamber Territory formed A shaft extending in the width direction of the drying container, a branch connected to the shaft and extending in a direction away from the shaft, and a drive unit that rotates the shaft. And a rotating part that rotates as a rotating shaft.

  With the above configuration, the fluidized bed drying apparatus can agitate the wet raw material of the fluidized bed in the rotating part, and suppress the clogging with the wet raw material charged in the vicinity of the charging area, while keeping the wet raw material uniform. Can be dried.

  Here, it is preferable that the rotating portion has a shape in which an end portion of the branch portion on the side far from the axis is bent in the rotation direction. Thereby, a wet raw material can be stirred more suitably.

  The rotating unit includes two shafts constituting the rotating unit, and the two shafts are arranged adjacent to each other in a direction from the charging unit to the discharging unit, and the two shafts rotate. The directions are opposite to each other, and it is preferable that the two shafts rotate so that the bent end portion of the branch portion faces upward between the shafts. Thereby, a wet raw material can be stirred more suitably.

  A hollow portion is formed inside the shaft and the branch portion of the rotating portion and connected to each other, and the branch portion has a plurality of ejection holes reaching the outside from the hollow portion. It is preferable that the apparatus further includes a steam supply device that supplies steam to the hollow portion, and the steam supplied from the steam supply device is discharged to the outside through the ejection holes. Thereby, a wet raw material can be stirred more suitably and a wet raw material can be dried.

  Preferably, the driving unit is the steam supply device, and the shaft is rotated by the force of the steam discharged from the branch part. Thereby, it can be rotated without providing a prime mover or the like. Further, when it is difficult to rotate only with the force of steam, it is also desirable to rotate with a rotating mechanism such as an electric motor.

  It has a dividing plate that is arranged inside the drying chamber and divides the drying chamber into a plurality of compartments in a direction from the charging unit toward the discharging unit, and the rotating unit is at least an end of the charging unit side. It is preferable to arrange in the compartment. Thereby, a wet raw material can be stirred more suitably and a wet raw material can be dried suitably.

  It is preferable that a heating unit that heats the wet raw material of the fluidized bed is further provided in the drying chamber, and the heating unit has a shape extending in the width direction and is disposed in each of the compartments. Thereby, a wet raw material can be dried more suitably.

  The fluidized bed drying facility of the present invention discharges the generated steam discharged from the fluidized bed drying apparatus according to any one of claims 1 to 8 and the steam discharge unit to the outside, which can dry the wet raw material. A generated steam line, a dust collector interposed in the generated steam line for removing dust in the generated steam, and a downstream of the dust collector in the generated steam line, the heat of the generated steam A heat recovery system for recovering the gas, a line for supplying a part of the generated steam from which dust is removed from the dust collector, supplying the fluidized gas to the fluidized gas supply unit, and discharging from the discharge unit And a cooler for cooling a dried product obtained by drying the wet raw material.

  By making the fluidized bed drying equipment have the above-described configuration, it is possible to effectively utilize the steam generated when the wet raw material is dried.

  The present invention is a wet raw material drying method comprising a drying container provided with a drying chamber in which a wet raw material is dried and a chamber chamber provided below the drying chamber, wherein the drying container is provided at one end of the drying container. A step of supplying a wet raw material, a step of discharging a dry substance from which the wet raw material is dried from the other end of the drying container, a step of supplying a fluidizing gas into the chamber chamber, and the drying from the chamber chamber Supplying the fluidized gas into the drying chamber through a gas dispersion plate having a through-hole through which the fluidized gas can be supplied, and forming the fluidized bed together with the wet raw material in the drying chamber; and supplying the fluidized gas A step of discharging generated steam generated by drying the wet raw material of the fluidized bed formed from the upper side of the drying container, and the wet chamber in the region of the drying chamber where the fluidized bed is formed. A shaft that extends in the width direction of the drying container; a branch that is connected to the shaft and extends away from the shaft; and a drive unit that rotates the shaft. A step of agitating the fluidized bed in the drying chamber by rotating the shaft of the rotating unit around the axis of rotation.

  By using the above method, the fluidized bed drying apparatus can stir the wet raw material in the fluidized bed in the rotating part, and suppresses clogging by the wet raw material charged in the vicinity of the charging area, while uniforming the wet raw material. Can be dried.

  According to the fluidized bed drying apparatus, the fluidized bed drying facility, and the wet raw material drying method of the present invention, it is possible to uniformly dry the wet raw material while suppressing clogging of the wet raw material charged in the vicinity of the charging region. There is an effect.

FIG. 1 is a schematic view showing an embodiment of a combined coal gasification combined power generation system to which the fluidized bed drying facility of this embodiment is applied. FIG. 2 is a schematic view showing an embodiment of a fluidized bed drying facility including the fluidized bed drying apparatus shown in FIG. FIG. 3 is a schematic view showing an embodiment of the fluidized bed drying apparatus shown in FIG. FIG. 4 is a top view of the fluidized bed drying apparatus shown in FIG. FIG. 5 is a schematic diagram illustrating a schematic configuration of a branch portion of the first rotation mechanism. FIG. 6 is a schematic diagram illustrating a schematic configuration of a branch portion of the second rotation mechanism. FIG. 7 is a schematic view showing another embodiment of the fluidized bed drying facility.

  Hereinafter, the present invention will be described in detail with reference to the drawings. It should be noted that the present invention is not limited by the modes for carrying out the invention (hereinafter referred to as embodiments). In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art and those that are substantially the same. Although this embodiment demonstrates the example which applied the fluidized-bed drying equipment based on this invention to a coal gasification combined cycle power generation system, the application object of this invention is not limited to a coal gasification combined cycle power generation system. For example, as a power generation system using product charcoal dried in a fluidized bed drying facility, product charcoal dried in a fluidized bed drying facility is supplied to a boiler furnace, a steam turbine is driven by steam generated in the boiler furnace, and a generator is used. It can also be used in a power generation system using a coal-fired boiler that obtains output. Even when the present invention is applied to a coal gasification combined power generation system, the method is not limited. Moreover, although this embodiment demonstrates by the case where lignite is used as a wet raw material (to-be-dried material), what is necessary is just a thing with a high water content, and low grade coal containing subbituminous coal etc., sludge, etc. may be used. it can.

  FIG. 1 is a schematic diagram illustrating an example of a combined coal gasification combined power generation system to which the fluidized bed drying facility of the present embodiment is applied. FIG. 2 is a schematic diagram illustrating an example of fluidized bed drying equipment including the fluidized bed drying apparatus illustrated in FIG. 1.

As shown in FIG. 1, an integrated coal gasification combined cycle (IGCC) system 10 includes a fluidized bed drying facility 100 that dries lignite 132 that is fuel to produce product coal 140, and product coal 140. A mill 20 that is pulverized into pulverized coal 40, a coal gasification furnace 13 that processes the pulverized coal 40 and converts it to gasified gas 42, and a gas turbine (GT) 14 that is operated using the gasified gas 42 as fuel. A heat recovery steam generator (HRSG) 16 that introduces turbine exhaust gas 46 from the gas turbine 14, a steam turbine (ST) 18 that is operated by the steam 48 generated in the exhaust heat recovery boiler 16, and Gas turbine 14 and / or steam turbine 1 8 and a generator (G) 19 connected to the generator 8. The combined coal gasification combined power generation system 10 is connected to the condenser 34 that condenses the steam discharged from the steam turbine 18 and returns the steam to the exhaust heat recovery boiler 16, and is connected to the gas turbine 14 and rotates together with the gas turbine 14. , The air is separated into nitrogen (N ₂ ) and oxygen (O ₂ ), the separated oxygen is supplied to a pipe through which the air compressed by the compressor 36 flows, and nitrogen is supplied from the mill 20. An air separation unit (ASU) 38 that supplies the transport path of the pulverized coal 40 transported to the coal gasification furnace 13. Note that the air 54 compressed by the compressor 36 is supplied to the coal gasifier 13 and the combustor 26.

  The combined coal gasification combined power generation system 10 produces lignite coal 132 by drying the lignite coal 132 in the fluidized bed drying facility 100, and pulverized coal 40 obtained by pulverizing the product coal 140 in the mill 20 is gasified in the coal gasification furnace 13. Gasification gas 42 which is a product gas is obtained. The coal gasification combined cycle power generation system 10 removes the gasified gas 42 by the cyclone 22 and the gas purification device 24 and purifies the gas, and then supplies the gasified gas 42 to the combustor 26 of the gas turbine 14 that is a power generation means. Generate high-pressure combustion gas 50 The coal gasification combined power generation system 10 drives the gas turbine 14 with the combustion gas 50. In the coal gasification combined power generation system 10, the gas turbine 14 is connected to the generator 19, and the generator 19 generates electric power by driving the gas turbine 14. Here, the turbine exhaust gas 46 after driving the gas turbine 14 still has a temperature of about 500 to 600 ° C. The combined coal gasification combined power generation system 10 sends the turbine exhaust gas 46 to the exhaust heat recovery boiler (HRSG) 16, and recovers the thermal energy of the turbine exhaust gas 46 by the exhaust heat recovery boiler (HRSG) 16. The combined coal gasification combined power generation system 10 generates steam 48 by heat energy recovered from the turbine exhaust gas 46 by an exhaust heat recovery boiler (HRSG) 16, and drives the steam turbine 18 by the steam 48. The combined coal gasification combined power generation system 10 removes NOx and SOx components from the exhaust gas 52, which is the gas from which the thermal energy is recovered from the turbine exhaust gas 46 by the exhaust heat recovery boiler (HRSG) 16, and then the chimney 32. Through the atmosphere.

  Hereinafter, the fluidized bed drying facility 100 will be described with reference to FIG. As shown in FIG. 2, the fluidized bed drying facility 100 includes a supply hopper 101 that supplies lignite 132 having a high water content, which is one of wet raw materials, and fluidized bed drying that dries the supplied lignite 132. The apparatus 102, the dust collector 105 for removing dust in the generated steam 134 discharged from the fluidized bed drying apparatus 102, and the dried lignite 138 extracted from the fluidized bed drying apparatus 102 are cooled to produce product coal 140. A heat recovery system 111 that is interposed downstream of the cooler 110 and the dust collector 105 and recovers the heat of the generated steam 134, and the generated steam 134 that recovers the heat in the heat recovery system 111 is processed to drain the water 142. And a circulation device 11 for supplying a part of the generated steam 134 discharged from the dust collector 105 as fluidized steam 136 to the fluidized bed drying apparatus 102. Equipped with a.

Further, the fluidized bed drying equipment 100 is a generated steam line L that discharges the generated steam 134 generated when drying the lignite 132 to the outside of the fluidized bed drying apparatus 102 and guides it to the dust collecting apparatus 105 as piping connecting each part. ₁ , a line L ₂ for supplying a part of the generated steam 134 from which dust is removed from the dust collector 105 as fluidized steam (fluidized gas) 136 into the fluidized bed drying apparatus 102, and the dust collector 105. Separation line L ₃ for supplying dusted lignite 144 to a pipe from which dried lignite 138 is discharged, and product line L ₄ for discharging product lignite 140 generated by cooling dry lignite 138 and solid component 144 by cooler 110. Is provided.

  Supply hopper 101 is a facility for storing lignite 132. The supply hopper 101 supplies the stored lignite 132 into the fluidized bed drying apparatus 102.

  The fluidized bed drying apparatus 102 forms a fluidized bed with the lignite 132 supplied from the supply hopper 101 and the fluidized steam 136 and moves it with the lignite 132 while heating the lignite 132 by heating means to dry the dried lignite 138. And In the fluidized bed drying apparatus 102, the fluidized steam 136 and the steam generated when the lignite 132 is dried are mixed into the generated steam 134. The fluidized bed drying apparatus 102 includes a heat transfer member (heating unit) 128 serving as a heating means provided therein, and a superheated steam supply device (high temperature gas supply) capable of supplying superheated steam (high temperature gas) A to the heat transfer member 128. Means) 129, a steam supply pipe 166 for supplying steam C therein, a steam recovery pipe 167 for recovering the steam D flowing through the steam supply pipe 166, a steam supply pipe 166 and a steam recovery pipe 167 connected to the steam A steam supply device 168 that supplies steam to the supply pipe 166 and collects steam flowing through the steam recovery pipe 167. The configuration of the fluidized bed drying apparatus 102 will be described later.

The dust collector 105 is a cyclone, a porous filter, an electric dust collector, or the like, and separates lignite (solid component) contained in the generated steam 134. Here, the generated steam 134 includes a fine powder component of lignite 132. The dust collector 105 collects and separates the solid component 144 obtained by drying and pulverizing the lignite 132 contained in the generated steam 134. Dust collector 105 of the solid component 144 separated, is supplied to the separation line _{L 3.} Solid component 144 supplied to the separation line L ₃ are mixed and joins the dry brown coal 138 withdrawn from the fluidized bed dryer 102 through.

The cooler 110 cools the dry powder in which the solid component 144 is mixed with the dry lignite 138 that has passed through and is extracted from the fluidized bed drying apparatus 102. Cooler 110 is discharged from the product line _{L 4} The cooled powder as product coal 140. This product charcoal 140 is supplied to the gasifier 13 as described above.

  The heat recovery system 111 is a system that recovers the heat of the generated steam 134 by heat exchange or the like. The heat recovery system 111 performs heat recovery for the generated steam 134. The water treatment unit 112 is a treatment device that treats the generated steam 134 that has been heat-recovered by the heat-recovery system 111. The water treatment unit 112 processes the generated steam 134 that has been heat-recovered by the heat-recovery system 111, and discharges the generated steam 134 to the outside of the fluidized bed drying facility 100 as drainage 142.

Further, the circulating apparatus 114 is interposed in the line L _2, and sends the air flowing through the line L ₂ in a predetermined direction. Specifically, the dust collector 105 sends a part of the generated steam 134 that has been collected through the line L ₂ into the fluidized bed dryer 102. The generated steam 134 sent into the fluidized bed drying apparatus 102 is used as fluidized steam 136 that causes the fluidized bed of lignite 132 to flow. In addition, although the fluidized bed drying equipment 100 of the present embodiment reuses a part of the generated steam 134 as a fluidizing medium for fluidizing the fluidized bed, the present invention is not limited to this, for example, nitrogen, carbon dioxide or Low oxygen concentration air containing these gases may be used.

  In addition, the fluidized bed drying facility 100 of the present embodiment uses a part of the generated steam 134 after being collected by the dust collector 105 in the heat recovery system 111 and uses the remaining part as fluidized steam. It is not limited to this. The fluidized bed drying facility 100 of the present embodiment may effectively use the heat of the generated steam 134 after being collected by the dust collector 105.

  According to the combined coal gasification combined power generation system 10, even when the lignite 132 having high moisture is gasified, the lignite 132 is dried by the efficient fluidized bed drying apparatus 102. The effect of lowering the temperature is small, the gasification efficiency is improved, and power generation can be performed stably over a long period of time.

  Next, the fluidized bed drying apparatus 102 will be described with reference to FIGS. Here, FIG. 3 is a schematic view showing an embodiment of the fluidized bed drying apparatus shown in FIG. 2, FIG. 4 is a top view of the fluidized bed drying apparatus shown in FIG. 3, and FIG. FIG. 6 is a schematic diagram illustrating a schematic configuration of a branch portion of the rotation mechanism, and FIG. 6 is a schematic diagram illustrating a schematic configuration of a branch portion of the second rotation mechanism.

  The fluidized bed drying apparatus 102 discharges a drying container 120 into which the lignite 132 is charged, a charging unit (loading port) 122 for charging the lignite 132 into the drying container 120, and a dry lignite 132 that has dried the lignite 132. A discharge unit (discharge port) 123, a gas dispersion plate 124 provided inside the drying container 120, a fluidized gas supply unit (fluidized gas supply port) 126 that supplies the fluidizing gas 136 to the drying container 120, , A steam discharge part (steam discharge port) 127 for discharging the generated steam 134, and a rotating part 160. Further, as described above, the fluidized bed drying apparatus 102 includes a heat transfer member 128 serving as a heating means provided inside, and a superheated steam supply device (a high-temperature gas) A that can supply the superheated steam (hot gas) A to the heat transfer member 128 ( High temperature gas supply means) 129, a steam supply pipe 166 for supplying steam to the inside, a steam recovery pipe 167 for recovering the steam that has flowed through the steam supply pipe 166, a steam supply pipe 166, and a steam recovery pipe 167. A steam supply device 168 that supplies steam to the steam supply pipe 166 and recovers the steam flowing through the steam recovery pipe 167 is provided (see FIG. 2).

  The drying container 120 is divided into a drying chamber 150 located on the upper side in the vertical direction (upper side in the drawing) and a chamber chamber 152 located on the lower side in the vertical direction (lower side in the drawing) by the gas dispersion plate 124. Yes. The drying chamber 150 is a region where lignite 132 is supplied and dried, and the chamber chamber 152 is a region where fluidized gas 136 is supplied. In the drying container 120, the fluidized gas 136 supplied to the chamber chamber 152 passes through the gas dispersion plate 124 and is supplied to the drying chamber 150. In the drying chamber 150, the fluidized gas 136 causes the lignite 132 to flow, whereby a fluidized bed 155 is formed.

  The charging unit 122 is connected to one end of the drying chamber 150 of the drying container 120. The input unit 122 is connected to the supply hopper 101 and inputs the lignite 132 supplied from the supply hopper 101 into the drying chamber 150 at one end. The discharge unit 123 is connected to the lower side in the vertical direction of the other end of the drying chamber 150 of the drying container 120, that is, in the vicinity of the gas dispersion plate 124. The discharge unit 123 is connected to a pipe connected to the cooler 110 and discharges the dry lignite 138 in the drying chamber 150 to the pipe.

The gas dispersion plate 124 has a large number of through holes 124a. The gas dispersion plate 124 allows the gas to flow between the drying chamber 150 and the chamber chamber 152 while suppressing the lignite 132 in the drying chamber 150 from falling into the chamber chamber 152. The fluidizing gas supply unit 126 is connected to the chamber chamber 152 and supplies the fluidizing gas 136 supplied from the line L ₂ into the chamber chamber 152. The steam discharge unit 127 is connected to the upper surface of the drying container 120. Steam discharge portion 127 guides the steam generated 134 in the drying vessel 120 to generate steam line _{L 1.}

  Here, the fluidized bed drying apparatus 102 includes a plurality of, in the present embodiment, four divided plates 154 disposed inside the drying chamber 150. The dividing plate 154 is a plate that extends in the width direction and the vertical direction of the drying chamber 150, and a surface that is orthogonal to a line connecting the input unit 122 and the discharge unit 123 is the front surface (surface having the largest area). It is. In this embodiment, the number of divided plates is four. However, the number of divided plates is not limited to this, and the number of divided plates is the most suitable. As shown in FIG. 3, the split plate 154 has a lower end in the vertical direction in contact with the gas dispersion plate 124, and an upper end in the vertical direction is positioned below the upper end of the fluidized bed 155. Further, as shown in FIG. 4 (vertical direction in FIG. 4), the dividing plate 154 is disposed in the entire drying chamber 150 in the width direction. Further, the plurality of divided plates 154 are arranged at a predetermined interval in the direction from the input unit 122 to the discharge unit 123. Thereby, the fluidized bed drying apparatus 102 is divided into a plurality of drying compartments 150a, 150b, 150c, 150d, and 150e in the direction from the input unit 122 to the discharge unit 123 in the drying chamber 150 of the drying container 120 by the plurality of dividing plates 154. Divided. The drying compartments 150a, 150b, 150c, 150d, and 150e are arranged in the order of the drying compartment 150a, the drying compartment 150b, the drying compartment 150c, the drying compartment 150d, and the drying compartment 150e from the input unit 122 to the discharge unit 123. ing. The chamber chamber 152 is also divided into five chamber compartments 152a, 152b, 152c, 152d, and 152e corresponding to the dry compartments 150a, 150b, 150c, 150d, and 150e.

  The fluidizing gas supply unit 126 is provided corresponding to the chamber compartments 152a, 152b, 152c, 152d, and 152e, and supplies the fluidizing gas 136 to the respective chamber compartments 152a, 152b, 152c, 152d, and 152e. To do. The heat transfer member 128 is arranged in a direction extending in the width direction in each fluidized bed 155 of the drying compartments 150a, 150b, 150c, 150d, and 150e.

  In the fluidized bed drying apparatus 102, lignite 132 is charged into the drying compartment 150a of the drying container 120 by the supply hopper 101, and fluidized steam 136 is introduced into the chamber compartment 152a. The fluidized steam 136 introduced into the chamber chamber 152a passes through the through holes 124a of the gas dispersion plate 124 and flows into the drying compartment 150a. The fluidized steam 136 that has flowed into the dry compartment 150a blows up and flows the lignite 132 that has been put into the dry compartment 150a. Thereby, the fluidized bed drying apparatus 102 forms the fluidized bed 155 in which the lignite 132 flows in the drying compartment 150a. A part of the lignite 132 fluidized in the drying compartment 150a moves upward in the vertical direction from the dividing plate 154, moves in the direction indicated by the arrow 156a, and moves to the drying compartment 150b.

  In the fluidized bed drying apparatus 102, the fluidized steam 136 is also introduced into the chamber compartment 152b. The fluidized steam 136 introduced into the chamber chamber 152b passes through the through hole 124a of the gas dispersion plate 124 and flows into the drying compartment 150b. The fluidized steam 136 that has flowed into the dry compartment 150b blows up and flows the lignite 132 that has been put into the dry compartment 150b. Thereby, the fluidized bed drying apparatus 102 forms the fluidized bed 155 in which the lignite 132 flows in the drying compartment 150b. Part of the lignite 132 fluidized in the drying compartment 150b moves upward in the vertical direction with respect to the dividing plate 154, moves in the direction indicated by the arrow 156b, and moves to the drying compartment 150c. The fluidized bed drying apparatus 102 constitutes a fluidized bed 155 together with the fluidized gas 136 to which the lignite 132 moved in the same manner also in the drying compartments 150c, 150d, and 150e. Further, a part of the lignite 132 in the fluidized bed 155 of the drying compartment 150c moves upward in the vertical direction from the dividing plate 154, moves in the direction indicated by the arrow 156c, and moves to the drying compartment 150d. Part of the lignite 132 in the fluidized bed 155 of the drying compartment 150d moves upward in the vertical direction with respect to the dividing plate 154, moves in the direction indicated by the arrow 156d, and moves to the drying compartment 150e. The fluidized bed drying apparatus 102 discharges the lignite 138 that has reached the discharge unit 123 out of the lignite 132 that has become the fluidized bed 155 in the drying compartment 150e as the dry lignite 138 from the discharge unit 123.

  As described above, in the fluidized bed drying apparatus 102, the fluidized bed 155 is formed in a portion including the drying compartments 150 a, 150 b, 150 c, 150 d, and 150 e, which is a portion on the lower side in the vertical direction of the drying chamber 150. After the lignite 132 is input at the input unit 122, it moves in a fluidized bed 155, passes through the drying compartments 150 a, 150 b, 150 c, 150 d, and 150 e in this order and is discharged from the discharge unit 123. . Note that the lignite 132 is gradually dried when passing through the drying compartments 150a, 150b, 150c, 150d, and 150e, and becomes the dried lignite 138 when discharged from the discharge unit 123.

  In the fluidized bed drying apparatus 102, a free board portion F is formed in a portion vertically above the fluidized bed 155 in the drying chamber 150. The free board portion F is a region where the generated steam 134 is generated by drying the lignite 132 of the fluidized bed 155. The fluidized steam 136 is steam at a certain temperature or higher, and the brown coal 132 is dried by heating the brown coal 132 while flowing.

  Next, as described above, the heat transfer member 128 is disposed in a region where the fluidized bed 155 of the drying compartments 150a, 150b, 150c, 150d, and 150e is formed. The heat transfer member 128 is a heating unit that heats the lignite 132 of the fluidized bed 155 and removes moisture in the lignite 132, and is a pipe through which the superheated steam A can flow. The heat transfer member 128 dries the lignite 132 constituting the fluidized bed 155 using the latent heat of the high-temperature superheated steam A supplied and circulated inside. The heat transfer member 128 discharges the superheated steam A used for drying as condensed water B to the outside of the fluidized bed drying apparatus 102.

That is, the heat transfer member 128 condenses the superheated steam A in a region in contact with the fluidized bed 155 to form a liquid (moisture), and is effective for heating the lignite 132 by the condensed latent heat radiated at this time. Use. Note that the high-temperature superheated steam A circulated through the heat transfer member 128 may be any heat medium that involves a phase change, and examples thereof include Freon, pentane, and ammonia. Further, the heat transfer member 128 is not limited to a configuration using a pipe for circulating a heat medium. The heat transfer member 128 only needs to supply heat to the lignite 132 and can be dried. For example, an electric heater may be installed. The generated steam 134 generated when the lignite 132 is dried by the heat transfer member 128 flows to the free board portion F on the upper side in the vertical direction (downstream side in the flow direction of the generated steam 134). Superheated steam supplying device 129 via a heating line L _5, and supplies the superheated steam A heat transfer member 128.

In the fluidized bed drying apparatus 102, the heat transfer member 128 provided inside the fluidized bed 155 heats the lignite 132 of the fluidized bed 155 to dry the lignite 132. The generated steam 134 generated by drying the lignite 132 flows from the fluidized bed 155 into the free board portion F. Then, the generated steam 134 that has flowed into the free board section F is discharged from the steam discharge section 127 to the outside of the fluidized bed drying apparatus 102. Generating steam 134 discharged from the steam discharge section 127 is supplied to generate steam line L _1.

  The fluidized bed drying apparatus 102 further includes a rotating unit 160. The rotating unit 160 is a mechanism for stirring the fluidized bed 155 of the drying compartment 150a, and includes a first rotating mechanism 162 and a second rotating mechanism 164. In addition, the rotating unit 160 includes the above-described steam supply pipe 166 that supplies the steam C, the steam recovery pipe 167 that recovers the steam D that flows through the steam supply pipe 166, the steam supply pipe 166, and the steam recovery pipe 167. And a steam supply device 168 for supplying steam to the steam supply pipe 166 and recovering the steam flowing through the steam recovery pipe 167.

  The first rotation mechanism 162 includes a shaft 170a, a branch part 172a, and a drive part 174a. The shaft 170a is a straight pipe in which a hollow portion having a hollow inside is formed, and is disposed so as to penetrate the drying compartment 150a in the width direction. That is, the straight pipe axis is arranged in a direction parallel to the width direction. The shaft 170a is disposed at a position passing through the fluidized bed 155 of the drying compartment 150a.

  The branch portion 172a is a member connected to the shaft 170a, and a plurality of the branch portions 172a are arranged with respect to the shaft 170a. The branch portions 172a are arranged at regular intervals in the width direction. As shown in FIG. 5, one branch portion 172 a has four straight portions 180 arranged at a constant angular interval in the circumferential direction around the shaft 170 a and ends of the straight portions 180 in a direction away from the shaft 170 a. And a bent portion 182 arranged respectively. One end of the linear portion 180 is connected to the shaft 170a and extends in a direction away from the shaft 170a. The bent portion 182 is bent in a direction orthogonal to the straight portion 180 in a circumferential direction, that is, a plane orthogonal to the axial direction. The bent portion 182 of this embodiment is bent with respect to the straight portion 180 toward the rotation direction 186 of the shaft 170a and the branch portion 172a. The straight part 180 and the bent part 182 constituting the branch part 172a are also pipes in which a hollow part is formed, and the internal space is connected to the space of the shaft 170a. Further, the branch portion 172a has a large number of ejection holes 184 connected from the internal space to the surface.

  The drive unit 174a is a drive mechanism such as a motor and is coupled to the shaft 170a. The drive unit 174a rotates the shaft 170a and the branch portion 172a in the rotation direction 186 using the shaft 170a as a rotation axis.

  The second rotation mechanism 164 includes a shaft 170b, a branch part 172b, and a drive part 174b. The shaft 170b is a straight pipe having a hollow portion formed therein, and is disposed so as to penetrate the drying compartment 150a in the width direction. That is, the straight pipe axis is arranged in a direction parallel to the width direction. The shaft 170b is disposed at a position that passes through the fluidized bed 155 of the drying compartment 150a. The shaft 170b is disposed at a position adjacent to the shaft 170a on the discharge unit 123 side of the shaft 170a.

  The branch portion 172b is a member connected to the shaft 170b, and a plurality of the branch portions 172b are arranged with respect to the shaft 170b. The branch portions 172b are arranged at regular intervals in the width direction. In addition, the branch part 172b is arrange | positioned in the position where the position of the width direction does not overlap with the branch part 172a. As shown in FIG. 6, one branch portion 172 b has four straight portions 190 arranged at a constant angular interval in the circumferential direction around the shaft 170 b and ends of the straight portion 190 in a direction away from the shaft 170 b. And a bent portion 192 arranged respectively. The basic shape of the branch part 172b is the same as that of the branch part 172a except that the bent direction of the bent part 192 is different. The bent portion 192 of the present embodiment is bent with respect to the straight portion 190 toward the rotation direction 196 of the shaft 170b and the branch portion 172b. The branch part 172b is also formed with a large number of ejection holes 194 connected from the internal space to the surface.

  The drive unit 174b is a drive mechanism such as a motor and is coupled to the shaft 170b. The drive unit 174b rotates the shaft 170b and the branch portion 172b in the rotation direction 196 with the shaft 170b as a rotation axis.

  Next, the steam supply pipe 166 is connected to one end of each of the shafts 170a and 170b. The steam recovery pipe 167 is connected to the other end of each of the shafts 170a and 170b. The steam supply device 168 supplies steam to the steam supply pipe 166 and recovers the steam flowing through the steam recovery pipe 167. Note that the steam supply device 168 preferably supplies steam having a temperature higher than that of the lignite 132, for example, superheated steam.

  The rotating unit 160 rotates the first rotating mechanism 162 and the second rotating mechanism 164 in the rotation directions 186 and 196 in the drying compartment 150a, respectively, so that the lignite 132 of the fluidized bed 155 circulates in the drying compartment 150a. Form a flow.

  The rotating unit 160 supplies the steam C supplied from the steam supply device 168 to the space inside the shafts 170a and 170b from the steam supply pipe 166, and flows it to the shafts 170a and 170b and the branch portions 172a and 172b. Further, the rotating unit 160 discharges a part of the steam C from the ejection holes 184 and 194 of the branch portions 172a and 172b to the outside, that is, toward the fluidized bed 155. The steam that has not been discharged from the ejection holes 184 and 194 reaches the steam recovery pipe 167 from the shafts 170a and 170b, and is returned from the steam recovery pipe 167 to the steam supply device 168.

  The fluidized bed drying apparatus 102 is provided with a rotating unit 160 in the drying compartment 150a for drying the lignite 132 input from the input unit 122 as in the present embodiment, and the rotating unit 160 is rotated to stir the fluidized bed 155. The lignite 132 can be prevented from staying and settling in the dry compartment 150a. Thereby, it can suppress that the lignite 132 is obstruct | occluded within the dry compartment 150a. Furthermore, by discharging steam from the ejection holes 184 and 194 of the branch parts 172a and 172b of the rotating part 160, the lignite 132 can be further fluidized and dried.

  Moreover, the rotation part 160 can stir the lignite 132 more efficiently by setting it as the shape which provided the bending parts 182 and 192 in the branch parts 172a and 172b. In addition, the rotating unit 160 is rotated so that the bent portions 182 and 192 of the branch portions 172a and 172b face upward between the shafts 170a and 170b of the first rotating mechanism 162 and the second rotating mechanism 164 that are opposed to each other. The flow direction in the drying compartment 150a flows upward between the first rotating machine course 162 and the second rotating machine course 164, and downwards outside the first rotating machine course 162 and the second rotating machine course 164. The direction can flow. Thereby, it can suppress more reliably that lignite 132 stays and settles in the dry compartment 150a.

  Moreover, the rotation part 160 can stir the lignite 132 more reliably by making the bending direction of the bending parts 182 and 192 of the branch parts 172a and 172b into the shape bent in the rotation direction side.

  The fluidized bed drying apparatus 102 divides the drying chamber 150 into a plurality of drying compartments 150a, 150b, 150c, 150d, and 150e, and moves the plurality of drying compartments 150a, 150b, By setting it as the structure which passes 150c, 150d, 150e in order, lignite can be dried more uniformly. That is, it can suppress that the lignite 132 which reaches | attains the discharge part 123 in a short time by the flow of the fluidized bed 155, or the lignite 132 which does not reach the discharge part 123 even if it passes for a long time can be suppressed.

  Further, as in the present embodiment, a part of the lignite 132 on the upper side of the fluidized bed 155 moves to the next drying compartment, so that the moisture content is relatively small and moves upward in one drying compartment. The lignite 132 that is being moved can be moved to the next drying compartment. That is, since the hydrated charcoal 132 that contains a relatively large amount of moisture and is not dried in the dry compartment is heavy, it can be moved to the lower side of the dry compartment and dried in the dry compartment. As a result, the lignite 132 is dried to a certain degree in each of the drying compartments 150a, 150b, 150c, 150d, and 150e, and then moves to the next drying compartment. It can be made into the dry state to the extent.

  Here, in the fluidized bed drying apparatus 102 of the present embodiment, the rotating unit 160 is provided only in the drying compartment 150a, but the present invention is not limited to this. For example, in the fluidized bed drying apparatus 102, the rotation unit 160 may be provided in the drying compartment 150b, or may be provided in all the drying compartments. In addition, since the lignite 132 has the most water | moisture content on the injection | throwing-in part 122 side, and it is easy to stay and settle, it is preferable to provide the rotation part 160 in the dry compartment on the injection | throwing-in part 122 side.

  Moreover, the fluidized bed drying apparatus 102 of this embodiment can stir the lignite 132 more by providing the bending parts 182 and 192 in the branch parts 172a and 172b. In addition, since the fluidized-bed drying apparatus 102 of this embodiment can acquire the said effect, it is preferable to provide the bending parts 182 and 192, but it does not necessarily need to provide.

  In addition, the fluidized bed drying apparatus 102 of the present embodiment is provided with the ejection holes 184 and 194 in the branch portions 172a and 172b, and can discharge the steam, thereby further stirring the lignite 132 and drying the lignite 132. Can be made. In addition, since the fluidized-bed drying apparatus 102 of this embodiment can acquire the said effect, it is preferable to provide the ejection holes 184 and 194, and to discharge | evaporate a vapor | steam, but it does not necessarily need to provide. That is, a configuration in which steam is not ejected may be employed.

  Moreover, it is preferable that the shafts 170a and 170b and the branch portions 172a and 172b of the rotating unit 160 are overheated by heating means. Thereby, the lignite 132 can be dried by the heat generated in the rotating unit 160. In addition, although the rotation part 160 cannot acquire the said effect, it is good also as a structure which is not heated.

  Moreover, in the said embodiment, although the rotation part 160 and the heat-transfer member 128 were provided separately, it is good also as integral. That is, the rotating unit 160 may be a mechanism in which a branch portion is disposed on the heat transfer member 128 and the heat transfer member 128 is rotated. Thus, by integrating the heat transfer member 128 and the rotating unit 160, the number of members installed in the drying compartment 150a can be reduced, and the lignite 132 can be more easily moved.

  Moreover, since the rotation part 160 can obtain the said effect more suitably like this embodiment, although it is preferable to provide two rotation mechanisms and to rotate in a different direction, it is not limited to this. One rotation mechanism may be provided, or the two rotation mechanisms may be rotated in the same direction. The fluidized bed drying apparatus 102 can suppress the staying and settling of the lignite 132 by providing the rotating unit 160 in the region where the fluidized bed 155 of the drying chamber 150 is formed.

  Moreover, in the said embodiment, although the motor was used as the drive parts 174a and 174b of the rotation part 160, this invention is not limited to this. A steam engine may be used as the drive unit. That is, the rotation unit 160 may rotate the shafts 170a and 170b and the branch portions 172a and 172b with a force for ejecting steam from the ejection holes 184 and 194. By using the force of the jetting steam in this way, it can be rotated without providing a prime mover such as a motor. In this case, the shafts 170a and 170b are supported by a rotatable support mechanism, for example, a bearing.

  Moreover, since the fluidized bed drying apparatus 102 of this embodiment can dry the lignite 132 suitably, it was made into the shape which divided | segmented the drying chamber 150 into the several drying compartment by the division plate 154, but it is not limited to this. The fluidized bed drying apparatus 102 can suppress the stay and settling of the lignite 132 by disposing the rotating unit 160 in the region where the lignite 132 is supplied from the charging unit 122, regardless of the shape of the drying chamber 150. Occlusion of the lignite 132 in the drying chamber 150 can be suppressed, and the lignite 132 can be dried uniformly.

  Another embodiment of the fluidized bed drying facility will be described with reference to FIG. Here, FIG. 7 is a schematic view showing another embodiment of the fluidized bed drying facility. A fluidized bed drying facility 200 shown in FIG. 7 includes a supply hopper 101, a fluidized bed drying device 102, a cooler 110, a circulation device 114, a scrubber 210 that injects water into generated steam 134 to remove dust, and a scrubber. 210, a reheater 212 that reheats the generated steam 230 that has passed through 210, a pressurizer 214 that heats the generated steam 232 that is heated by the reheater by compressing a part of the generated steam 232 to steam C, and flushes the steam D. A flushing portion 216 for performing the above operation.

In addition, the fluidized bed drying facility 200 is a fluidized bed drying that uses a part of the generated steam line L ₁ and the generated steam 232 that has passed through the reheater 212 as fluidized steam (fluidized gas) 136 as piping connecting the respective parts. The fluidized gas line L ₂ supplied into the apparatus 102, the product line L ₄ for discharging the product charcoal 140 generated by cooling the dry lignite 138 and the solid component 144 with the cooler 110, and the reheater 212. The generated steam line L ₆ that supplies a part of the generated steam 232 to the pressurizer 214 and the liquid generated by the flushing unit 216 are guided to the reheater 212, and the liquid that has passed through the reheater 212 is guided to the scrubber 210. comprising a liquid supply line _{L 7,} the.

Scrubber 210, by injecting the liquid 242 passing through the reheater 212 to generate steam 134 supplied with generated vapor line L _1, for collecting foreign substances contained in the generated steam 134. The generated steam 134 passes through the scrubber 210 and becomes the generated steam 230 from which foreign matters are removed. Further, the scrubber 210 collects the liquid 242 ejected with respect to the generated steam 134 and discharges it as the drainage 142.

The reheater 212 is a device that performs heat exchange, and performs heat exchange between the liquid 240 supplied from the flushing unit 216 and the generated steam 230. Here, the liquid 240 is, for example, a liquid at 150 ° C., and the generated vapor 230 is vapor having a temperature lower than that of the liquid 240. The reheater 212 heats the generated steam 230 with the heat of the liquid 240 and changes the generated steam 230 to the generated steam 232 having a higher temperature. Further, the reheater 212 makes the liquid 242 by absorbing the heat of the liquid 240. The liquid 242 that has passed through the reheater 212 is supplied to the scrubber 210 described above. Further, the steam generated 232 that has passed through the reheater 212 is supplied by branching off to the fluidizing gas line L ₂ and the generated steam line L _6.

Pressurizer 214 is a compressor or the like, by pressurizing the steam generation 232 supplied from the steam generated line L _6, a more high-temperature high-pressure state. The generated steam 232 pressurized by the pressurizer 214 is supplied to the supply pipe 166 as the steam C and is supplied to each part of the rotating unit 160 described above.

The flushing part 216 is a mechanism for flushing the steam D passing through the steam recovery pipe 167 after passing through each part of the rotating part 160. The flushing unit 216 performs vapor-liquid separation of the vapor D and supplies the vapor 238 to the generated vapor line L _6, and supplies the liquid 240 that has been flushed to remove foreign matters to the liquid supply line L ₇ .

  The fluidized bed drying facility 200 uses the configuration in which the generated steam 134 generated in the fluidized bed drying device 102 is processed instead of the steam supply device 168 in this way, so that the heat generated in the fluidized bed drying facility 200 is efficiently used. Can be used well. Moreover, it is not necessary to provide a separate device for generating steam. Moreover, the waste water 142 contained in the steam circulating in the fluidized bed drying facility 200 can be discharged from the scrubber 210 together. Thereby, waste water treatment can be performed efficiently.

  In addition, heat in the fluidized bed drying facility 200 can be efficiently used by exchanging heat between the liquid sprayed by the scrubber 210 and the generated steam 230 in order to remove foreign substances contained in the generated steam 134. Can do.

  Note that the fluidized bed drying facility 200 may be configured such that the steam generated by pressurizing the generated steam 134 with the pressurizer 214 is the superheated steam A and the condensed water B is flushed with the flushing device 216. Further, a steam supply device 168 may be provided, and steam generated by processing the generated steam 134 may be used as the heating steam A.

DESCRIPTION OF SYMBOLS 10 Coal gasification combined cycle system 100 Fluidized bed drying equipment 101 Supply hopper 102 Fluidized bed drying apparatus 105 Dust collector 110 Cooler 111 Heat recovery system 120 Drying container 122 Input part 123 Discharge part 124 Gas distribution plate 126 Fluidized gas supply part 127 Steam exhaust section 128 Heat transfer member 129 Superheated steam supply device 132 Brown coal 134 Generated steam 136 Fluidized steam 138 Dry lignite 140 Product coal 142 Drainage 144 Solid components 150 Drying chamber 150a, 150b, 150c, 150d, 150e Drying compartment 152 Chamber chamber 152a, 152b, 152c, 152d, 152e Chamber compartment 154 Dividing plate 155 Fluidized bed 156a, 156b, 156c, 156d Arrow 160 Rotating part 162 First rotating mechanism 164 Second rotating mechanism 166 Steam supply 167 Steam recovery pipe 168 Steam supply device 170a, 170b Shaft 172a, 172b Branch part 174a, 174b Drive part 180, 190 Straight part 182, 192 Bent part 184, 194 Blowing hole A Superheated steam B Condensate C Steam D Steam F Free Board part L ₁ generation steam line L ₂ line L ₃ separation line L ₄ product line L ₅ heating line

Claims (9)

A drying container comprising a drying chamber in which a wet raw material is dried and a chamber chamber provided below the drying chamber;
An input unit for supplying the wet raw material to one end of the drying container;
A discharge part for discharging the dried material dried from the wet raw material from the other end of the drying container;
A gas dispersion plate in which a through-hole capable of supplying gas from the chamber chamber to the drying chamber is formed;
A fluidized gas supply unit configured to supply a fluidized gas that forms a fluidized bed together with the wet raw material in the drying chamber to the chamber chamber;
A steam discharge unit for discharging generated steam generated by drying the wet raw material of the fluidized bed formed by supplying the fluidizing gas from above the drying container;
A rotating part for stirring the fluidized bed in the drying chamber,
The rotating unit is disposed in a region on the charging unit side in a region where the fluidized bed of the drying chamber is formed, and is connected to the shaft extending in the width direction of the drying container and the shaft. A fluidized bed drying apparatus comprising: a branch portion extending in a separating direction; and a drive unit that rotates the shaft, wherein the shaft rotates as a rotation shaft.   The rotating part has a shape in which an end part of the branch part far from the axis is bent in a rotating direction.   The rotating portion has two of the shafts that constitute the rotating shaft, and the two shafts are arranged adjacent to each other in a direction from the charging portion toward the discharging portion, and the rotational directions of the two shafts are determined. 3. The shaft according to claim 2, wherein the shafts are rotated in the directions opposite to each other, and the two shafts are rotated by the drive unit so that the end portion where the branch portion is bent between the shafts faces upward. Fluidized bed drying equipment. A hollow part is formed inside the shaft and the branch part of the rotating part, and connected to each other,
It has a steam supply apparatus which supplies a vapor | steam to the said hollow part, The vapor | steam supplied from the steam supply apparatus of the previous term is discharged | emitted from the said ejection hole to the exterior. The fluidized bed drying apparatus as described. The drive unit is the steam supply device,
The fluidized bed drying apparatus according to claim 4, wherein the shaft is rotated by a force of steam discharged from the branch portion. A plurality of dividing plates that are arranged inside the drying chamber and divide the drying chamber into a plurality of compartments in a direction from the charging unit toward the discharging unit;
The fluidized bed drying apparatus according to any one of claims 1 to 5, wherein the rotating unit is disposed at least in a branch chamber at an end portion on the charging unit side. A heating unit for heating the wet raw material of the fluidized bed in the drying chamber;
The fluidized bed drying apparatus according to claim 6, wherein the heating unit has a shape extending in the width direction and is disposed in each of the compartments. The fluidized bed drying apparatus according to any one of claims 1 to 7, wherein the wet raw material can be dried;
A generated steam line for discharging the generated steam discharged from the steam discharge unit to the outside;
A dust collector that is interposed in the generated steam line and removes dust in the generated steam;
A heat recovery system that is interposed downstream of the dust collector in the generated steam line and recovers the heat of the generated steam;
A line for supplying a part of the generated steam from which dust is removed from the dust collector to the fluidizing gas supply unit as the fluidizing gas;
A fluidized bed drying facility comprising: a cooler that cools a dried product obtained by drying the wet raw material discharged from the discharge unit. A wet raw material drying method comprising a drying chamber provided with a drying chamber in which a wet raw material is dried and a chamber chamber provided below the drying chamber,
Adding the wet raw material to one end of the drying container;
Discharging the dried product of the wet raw material from the other end of the drying container;
Supplying a fluidizing gas into the chamber chamber;
Supplying the drying chamber through a gas dispersion plate in which a through hole capable of supplying the fluidizing gas from the chamber chamber to the drying chamber is formed, and forming a fluidized bed together with the wet raw material in the drying chamber;
Discharging generated steam generated by drying the wet raw material of the fluidized bed formed by supplying the fluidizing gas from above the drying vessel;
A portion of the drying chamber in which the fluidized bed is formed is disposed in a region on the side where the wet raw material is charged, and is connected to the shaft and extends away from the shaft. And a step of stirring the fluidized bed in the drying chamber by rotating the shaft of a rotating unit having a branch portion extending in a direction and a driving unit for rotating the shaft as a rotating shaft. Wet raw material drying method.

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