JP6039006B1 - Biomass fuel drying equipment - Google Patents

Abstract

[PROBLEMS] To deodorize odor generated in a process of drying a raw material of biomass fuel with high efficiency without using a special furnace operated other than biomass fuel. A rotating cylindrical body 1 for discharging dried biomass fuel from a dry matter discharge port, a first cylindrical body 2 surrounding an outer wall of the rotating cylindrical body 1, and an outer wall of the first cylindrical body 2 are provided. A first flow path for sending the air in the second cylindrical body 3 surrounding and the second gap 22 between the outer wall of the first cylindrical body 2 and the second cylindrical body 3 into the rotating cylindrical body 1 35, and combustion furnaces 4A and 4B for burning biomass fuel, wherein heat from combustion is applied to the outer wall of the rotating cylindrical body 1, and hot gas from combustion is applied to the outer wall of the rotating cylindrical body 1 and the first wall. Combustion furnaces 4A and 4B that feed into the first gap 21 between the inner walls of the cylindrical body 2, and a second flow path 5 that takes in the gas gas flowing through the rotating cylindrical body 1 and feeds it into the combustion furnaces 4A and 4B It comprises. [Selection] Figure 1

Description

  TECHNICAL FIELD The present invention relates to a biomass fuel drying apparatus for drying a raw material of biomass fuel to produce a dried biomass fuel, and particularly to a biomass fuel drying apparatus configured to deodorize unpleasant odors that occur. Is.

  Patent Document 1 discloses a aging fermentation process for aging fermentation of organic waste such as livestock manure and garbage, a process for deodorizing and adsorbing odors generated in this aging fermentation process using a deodorizing agent, and the aging fermentation process. In a device having a pre-drying treatment step to prepare fermentation conditions prior to the deodorizing agent, it is disclosed that a deodorizing agent whose deodorizing effect is weakened by being used in the deodorizing and adsorbing step is used as a fuel for the pre-drying treatment step. Yes.

  Further, Patent Document 2 is configured to include a drying furnace and a thermal decomposition furnace at the subsequent stage in the hot stove, and the gas obtained from the thermal decomposition furnace is combusted in the combustion furnace so that the amount of heat of the gas turbine exhaust gas. A technique for making up for the shortage and deodorizing dry moisture taken out from the drying furnace with a hot air furnace is disclosed.

  Further, Patent Document 3 includes a gasifier for gasifying biomass and a garbage dryer for drying the garbage, and the waste heat of the gasifier is fed into the garbage dryer as hot air. A garbage processing system is disclosed in which garbage contained in a dryer is dried by exhaust heat, and exhaust gas from the garbage dryer is returned to a distribution path of hot air flowing in a gasifier.

JP 2009-167063 A JP 2003-279015 A JP 2013-111498 A

  According to the technique of the above-mentioned Patent Document 1, although a deodorizer can be used without waste, it is necessary to use a deodorizer that is not originally required for the biomass fuel drying process, which causes a problem of increased cost.

  The technique of Patent Document 2 is not sufficient, although a certain degree of deodorizing effect can be obtained because dry steam and air obtained by a drying furnace are introduced into the hot air furnace.

  The technology of Patent Document 3 is to deodorize by passing the exhaust after drying the garbage through the flue, and when the demand for deodorization is strong, throw the exhaust after drying the garbage into the external heating furnace It is. Deodorization by passing through a flue cannot obtain a sufficient effect, and the external heating furnace is separate from the biomass fuel gas reactor, and the fuel obtained from the waste dryer is used as fuel. Not what you want. In other words, a system that requires a special external heating furnace that burns with high heat, in addition to a combustion furnace that uses biomass fuel resulting from drying of biomass fuel and a dryer that dries the raw material of biomass fuel. Yes, the cost is high.

  The present invention has been made in view of the present situation of the biomass fuel drying apparatus as described above, and its purpose is to operate other than biomass fuel when drying biomass fuel raw material to produce biomass fuel. An object of the present invention is to provide a biomass fuel drying apparatus that can efficiently deodorize odors generated in the process of drying a raw material of biomass fuel without using a special furnace.

The biomass fuel drying apparatus according to the present invention is a rotating cylindrical body having a cylindrical shape, and a raw material of biomass fuel is input from a first end portion of the rotating cylindrical body, and is formed in a spiral shape on an inner wall surface. As a dried biomass fuel, the raw material is guided to the second end side opposite to the first end portion of the rotating cylindrical body by the protuberance according to its rotation. A first gap is formed between the rotating cylindrical body discharged from the dry matter discharge port and the outer wall of the rotating cylindrical body so as to surround the outer wall of the rotating cylindrical body, and in the vicinity of the first end and the first A second gap is formed between the first cylinder sealing the first gap in the vicinity of the end of the second cylinder and the outer wall of the first cylinder surrounding the outer wall of the first cylinder. Forming and taking in air into the second gap near the first end A second cylinder in which the second gap is sealed in the vicinity of the second end, and air in the second gap is taken in the vicinity of the second end, and the second A first flow path that feeds into the rotating cylindrical body from an end of the rotating cylinder, and a combustion furnace that burns biomass fuel, providing heat from combustion to the outer wall of the rotating cylindrical body, and supplying hot gas from combustion to the first A combustion furnace to be fed into the gap of 1 and a gas gas flowing from the second end side to the first end side in the rotating cylindrical body from the vicinity of the first end part and fed into the combustion furnace. The second flow path and the hot gas flowing from the first end side to the second end side in the first gap are taken in from the vicinity of the second end in the first gap, ; and a third flow path for feeding the exhaust dust collector, the dried product outlet, dry A transfer chamber having transfer means for transferring an object in a direction away from the rotating cylindrical body communicates, and a part of the third flow path is provided surrounding the transfer chamber, and the third chamber Heat is applied to the dried material conveyed in the conveyance chamber by hot gas flowing through the flow path .

  In the biomass fuel drying apparatus according to the present invention, in the middle of the second flow path, the second flow path is arranged in the center, and a heating chamber having a chamber surrounding the central second flow path. And the second flow path is arranged so that the gas gas passing through the second flow path flows through the center of the heating chamber and then passes through the first gap, The gas gas in the second flow path is heated in the first gap and is disposed so as to be guided to a chamber surrounding the second flow path in the center of the heating chamber. The gas gas flowing through the flow path is heated.

  In the biomass fuel drying apparatus according to the present invention, a fan for drawing gas gas from the vicinity of the first end in the rotating cylinder to the downstream side of the heating chamber in the second flow path. Is provided.

  In the biomass fuel drying apparatus according to the present invention, an arc-shaped flow path that passes through the first gap in a circular arc shape coaxial with the rotating cylindrical body on the downstream side of the fan in the second flow path. The gas gas flowing through the second flow path is heated by the hot air in the first gap.

  In the biomass fuel drying apparatus according to the present invention, the gas gas that has passed through the arc-shaped channel is again passed through the fourth channel that passes through the first gap in a circular arc that is coaxial with the rotary cylinder. Then, the gas is introduced into the heating chamber, and the gas gas flowing through the second flow path is heated in the heating chamber.

  In the biomass fuel drying apparatus according to the present invention, the outer wall of the rotating cylindrical body has a spirally formed protrusion, and the hot gas flowing through the first gap toward the second end portion is provided. It is characterized by slowing the flow.

  The biomass fuel drying apparatus according to the present invention is characterized in that a charging device including a fuel conveyance path for feeding biomass fuel into the combustion furnace is provided.

  In the biomass fuel drying apparatus according to the present invention, the dry matter discharge port communicates with a transfer chamber provided with a transfer means for transferring the dry matter in a direction away from the rotating cylindrical body, and the end of the transfer chamber. A dry matter transport path for transporting a dry matter from the feed to the charging device is provided.

  In the biomass fuel drying apparatus according to the present invention, two combustion furnaces are provided.

  According to the present invention, the heat of the combustion furnace for burning the biomass fuel is applied to the outer wall of the rotating cylindrical body that conveys the raw material of the biomass fuel to dry the raw material, and the gas gas flowing through the rotating cylindrical body is Since it is fed into the combustion furnace and heated to a high temperature in the combustion furnace, biomass fuel can be produced without using a special furnace operated outside of biomass fuel when drying biomass fuel raw material to produce biomass fuel. It is possible to deodorize the odor generated in the process of drying the raw material with high efficiency.

  According to the present invention, combustion gas is discharged from the first end side to the second end side while flowing the hot gas sent from the combustion furnace along the outer wall of the rotating cylindrical body, The hot gas flowing along the outer wall of the rotating cylindrical body is taken in from the vicinity of the second end and sent to the exhaust dust collector, so that the hot gas with almost no odor removed is discharged. can do.

The plane sectional view showing the embodiment of the biomass fuel drying device of the present invention. The principal part right view of embodiment of the biomass fuel drying apparatus of this invention. The principal part front sectional view of the embodiment of the biomass fuel drying device of the present invention. XX sectional drawing of FIG. YY sectional drawing of FIG.

  Hereinafter, an embodiment of a biomass fuel drying apparatus according to the present invention will be described with reference to the accompanying drawings. In each figure, the same components are denoted by the same reference numerals, and redundant description is omitted. FIG. 1 is a plan sectional view of the present embodiment. The biomass fuel drying apparatus includes a rotating cylindrical body 1 that is long in the horizontal direction of the figure. The rotating cylindrical body 1 is an outer wall of the rotating cylindrical body 1 and includes flanges 12 having a diameter larger than those of the other portions at left and right ends in the longitudinal direction. A front view of the flange 12 viewed from the first end 1A side of the rotating cylindrical body 1 is shown in FIG. Rollers 12 </ b> A and 12 </ b> A are in contact with a circumferential position slightly left and right away from the lowermost end of the flange 12. Each of the rollers 12A and 12A is provided on a pair of bearings 11 so as to be freely rotatable. A flange 12, rollers 12A and 12A, and a bearing 11 similar to the above are also provided on the outer wall of the rotating cylindrical body 1 and on the left end side in the longitudinal direction.

  A raw material for biomass fuel is fed from the first end 1 </ b> A of the rotating cylindrical body 1. The raw material is a litter containing human waste and the like containing 60% to 70% of moisture before drying. A chain 13 is fixed to the outer wall of the rotating cylindrical body 1 on the first end 1A side further than the bearing 11 on the first end 1A side. A motor 14 is provided further on the first end 1 </ b> A side than the chain 13. A sprocket 15 that meshes with the chain 13 is fixedly provided on the shaft of the motor 14. For this reason, the rotating cylindrical body 1 can be rotated by the rotation of the motor 14. The chain 13 and the sprocket 15 can be changed to other means for transmitting rotation of gears or the like.

  As shown in FIG. 3, the raw material is charged into the central portion of the first end portion 1 </ b> A of the rotating cylindrical body 1 from the tip of the raw material charging skip conveyor 17. A rotary damper 16 is provided in the vicinity of the tip of the skip conveyor 17 to control the input amount. Further, a screw type conveyor 19 that conveys the raw material from the raw material hopper 18 and puts it into the rotary damper 16 is provided on the start end side of the skip conveyor 17.

  The inner wall surface of the rotating cylindrical body 1 is provided with a plurality of ridges 1 </ b> C formed in a spiral shape. The rotating cylindrical body 1 is configured to guide the raw material to the second end 1B side opposite to the first end 1A of the rotating cylindrical body 1 by the protrusion 1C according to its rotation. The protrusion 1C has a steeply spiral shape in the vicinity of the first end 1A and the second end 1B, and in other parts, a plurality of continuous protrusions have a predetermined length. As described above, a short ridge is provided. On the second end portion 1B side, a dry matter discharge port for drying the raw material and discharging it as biomass fuel is provided. The protrusion 1C appears as shown in FIG. 4, which is a cross-sectional view taken along the line XX of FIG.

  The outer wall of the rotating cylindrical body 1 is surrounded by the first cylindrical body 2. The first cylinder 2 may be a cylinder. A first gap 21 is formed between the outer wall of the rotating cylindrical body 1 and the inner wall of the first cylindrical body 2. The first gap 21 is sealed with a ring-shaped lid in the vicinity of the first end 1A and in the vicinity of the second end 1B.

  The outer wall of the first cylinder 2 is surrounded by the second cylinder 3. The second cylinder 3 may be a cylinder. A second gap 22 is formed between the outer wall of the first cylinder 2 and the inner wall of the second cylinder 3. The second gap 22 has an air intake 23 for taking in air in the vicinity of the first end 1A, and is sealed by a ring-shaped lid in the vicinity of the second end 1B.

  The first cylindrical body 2 is formed so that the first gap 21 is narrowed from a position P where the length of the rotating cylindrical body 1 in the longitudinal direction is divided into 3 to 2 from right to left. The diameter of the cylindrical body 3 is also narrowed following the first cylindrical body 2. A plurality of spiral ridges 1D are provided on the outer wall from the second end 1B of the rotating cylindrical body 1 to the position P, and the position P from the terminal end 3A of the second cylindrical body 3 is provided. In the first gap 21 up to this point, the flow of the hot gas flowing in the first gap toward the second end is made slow. That is, the rotation direction of the spiral of the protrusion 1D is opposite to the rotation direction of the spiral of the protrusion 1C, and the first gap 21 is formed by a plurality of small passages by the adjacent protrusions 1D and 1D. In this section, heat is efficiently transferred to the air in the second gap 22 and the raw material in the rotating cylindrical body 1. The protrusion 1D appears as shown in FIG. 4, which is a cross-sectional view taken along the line XX of FIG.

  Said 2nd cylinder 3 is arrange | positioned at the installation position formed in the plane, or the cylinder mounting stand provided in this installation position. As shown in FIG. 4, the first cylindrical body 2 and the second cylindrical body 3 are concentrically integrated by a plurality of coupling materials (such as bolts and nuts and welding of coupling rods) provided at appropriate positions of the cylinder. The Further, the rotating cylindrical body 1 is arranged concentrically with the first cylindrical body 2 and the second cylindrical body 3 by arranging the bearing 11 on a bearing base provided at an installation position formed on a plane. The

  A first combustion furnace 4A is provided on a side surface of the rotating cylindrical body 1 and close to the air intake port 23, and in a lateral position (in the direction of the second end 1B) of the first combustion furnace 4A. Is provided with a second combustion furnace 4B. The first combustion furnace 4A and the second combustion furnace 4B are combustion furnaces for burning biomass fuel, and provide heat from combustion to the outer wall of the rotating cylindrical body 1 and supply hot gas from combustion to the first combustion furnace. 1 to the gap 21. The first combustion furnace 4A and the second combustion furnace 4B are provided with ignition burners 41A and 41B for initial combustion and ignition of the input biomass fuel for about 10 minutes, for example. The fuel of the ignition burners 41A and 41B can be, for example, propane gas or city gas.

  Biomass fuel is located behind the first combustion furnace 4A and the second combustion furnace 4B (on the side away from the rotating cylindrical body 1) and at an intermediate position between the first combustion furnace 4A and the second combustion furnace 4B. The charging device 42 is provided. YY sectional drawing of the injection | throwing-in apparatus 42 is like FIG. 5, The upper half of the container part 43 is mortar shape, and the lower half is a bottomed cylindrical shape.

  A rotation shaft 44 is provided upward from the center of the bottom surface of the container portion 43, and a plurality of wings 45 are provided on the rotation shaft 44. Each wing 45 has a trapezoidal shape. Holes 46 and 46 for dropping biomass fuel are provided at two locations on the bottom surface of the container portion 43. Screw conveyors 47, 47 are provided below the holes 46, 46. The screw conveyors 47, 47 extend in the direction of the rotating cylindrical body 1, and are on the side of the first combustion furnace 4A and the second combustion furnace 4B. The biomass fuel is transported to the direction. A hopper (not shown) is provided at the tip of the screw conveyors 47 and 47, and screw conveyors 48A and 48B are connected to the hopper, and the screw conveyors 48A and 48B are the first combustion furnace 4A and the second combustion furnace 4B. The biomass fuel is transported into the furnace.

  The first combustion furnace 4A and the second combustion furnace 4B are provided with a mechanism for dropping the incineration ash of biomass fuel to a predetermined position at the bottom of the furnace. At the predetermined positions of the first combustion furnace 4A and the second combustion furnace 4B, start end portions of ash extraction conveyors 31A and 31B for conveying the incineration ash are provided. The ash removal conveyors 31A and 31B convey the incineration ash to the opposite side of the rotating cylindrical body 1 and discharge and accumulate it on the incineration ash stackers 32A and 32B. The incineration ash stackers 32A and 32B are configured to be movable. When an appropriate amount of incineration ash is accumulated, the incineration ash stackers 32A and 32B are moved to an incineration ash storage chamber (not shown), After that, it can be returned to its original position and used.

  A first flow path 35 is provided in the vicinity of the second end 1 </ b> B in the second gap 22. The first flow path 35 takes in from the air inlet 23 in the vicinity of the first end 1A, takes in the air flowing through the second gap 22 in the vicinity of the second end 1B, and from the second end 1B. It is fed into the rotating cylinder 1.

  A second flow path 5 is provided between the first combustion furnace 4 </ b> A and the second combustion furnace 4 </ b> B from the first end of the rotating cylindrical body 1. The second flow path 5 takes in the gaseous gas flowing from the second end 1B side to the first end 1A side in the rotating cylindrical body 1 from the vicinity of the first end 1A, and the combustion furnace 4A and 4B are flow paths that feed into the interior.

  A part of the second flow path 5 constitutes a pipe 52 in the heating chamber 51. That is, the heating chamber 51 is provided in the middle of the second flow path 5, and the second flow path 5 (pipe 52) is arranged in the center to surround the second flow path 5 in the center. 53.

  A first dust collector 54 is provided on the downstream side of the heating chamber 51, and gas gas is drawn from the vicinity of the first end 1 </ b> A in the rotating cylindrical body 1 further downstream of the first dust collector 54. A fan 55 is provided. The second flow path 5 is branched downstream of the fan 55 to become second flow paths 5A and 5B. Both the second flow paths 5 </ b> A and 5 </ b> B pass through the first gap 21 and appear outside the second cylinder 3. That is, the second flow paths 5 </ b> A and 5 </ b> B both go out of the second cylindrical body 3, for example, half-circumferentially around the outer periphery of the rotating cylindrical body 1 in the first gap 21. The gas gas in the second flow paths 5A and 5B is heated while the outer circumference of the rotating cylindrical body 1 is made, for example, half a circumference in the first gap 21.

  Of the second flow paths 5A and 5B appearing outside the second cylinder 3, the second flow path 5B is connected to the second combustion furnace 4B. Accordingly, the gas gas that has passed through the second flow path 5B is charged into the second combustion furnace 4B.

  Of the second flow paths 5A and 5B that have appeared outside the second cylindrical body 3, the second flow path 5A connects a further branched fourth flow path 5C. The fourth flow path 5C passes through the first gap 21 again and appears outside the second cylinder 3 in which the heating chamber 51 is provided. In other words, the fourth flow path 5 </ b> C exits the heating chamber 51 side, for example, by making a half turn around the outer periphery of the rotating cylindrical body 1 in the first gap 21. The gas gas in the fourth flow path 5C is heated while the outer circumference of the rotating cylindrical body 1 is made, for example, half a circumference in the first gap 21.

  As described above, in the present embodiment, the gas gas that has passed through the first gap 21 that is the outer circumferential arc-shaped flow path of the rotating cylindrical body 1 is recirculated in the first gap 21 to be coaxial with the rotating cylindrical body 1. The gas is introduced into the heating chamber 51 through the fourth flow path 5C passing in an arc shape, and the gas gas flowing through the second flow path 5 is heated in the chamber 53 of the heating chamber 51. The gaseous gas is discharged from the chamber 53 of the heating chamber 51 to the first gap 21 via the pipe 56.

  The second flow path 5A is connected to the first combustion furnace 4A downstream from the branch point with the fourth flow path 5C. Accordingly, the gas gas that has passed through the second flow path 5A is charged into the first combustion furnace 4A.

  In the vicinity of the second end 1B, which is the terminal end of the first gap 21, the third flow path 6 that connects the first gap 21 in the vicinity of the second end 1B and the exhaust dust collector 61 is provided. Is provided. The third flow path 6 allows the hot gas flowing in the first gap 21 from the first end portion 1A side to the second end portion 1B side to pass through the second gap in the first gap 21. It is taken in from the vicinity of the end 1B and sent to the exhaust dust collector 61.

  Between the third flow path 6 and the exhaust dust collector 61, the raw material discharged from the dry matter discharge port provided on the second end 1B side of the rotating cylindrical body 1 is dried to obtain biomass fuel. A transfer chamber 63 including a screw conveyer 62 which is a transfer means for transferring the image is provided. This transfer chamber 63 is provided so as to surround a part of the third flow path 6A. For example, it can be set as the structure by which the conveyance chamber 63 is mounted in the sealed flow path 6A except an entrance and an exit. The hot gas in the third flow path 6 gives heat to the biomass fuel transported through the transport chamber 63 while passing through the flow path 6A, and promotes further drying.

  An exhaust fan 66 is provided between the flow path 6 </ b> A and the exhaust dust collector 61, and an exhaust fan 67 is also provided outside the exhaust dust collector 61.

  The apparatus configured as described above operates as follows. Biomass fuel is accumulated in the charging device 42, the biomass fuel is conveyed to a hopper (not shown) by the screw conveyors 47, 47, and the biomass fuel is transferred from the hopper via the screw conveyors 48A, 48B to the first combustion furnace 4A and the second combustion. Charge to the furnace 4B.

  The ignition burners 41A and 41B are ignited, and fire is sent to the biomass fuel in the first combustion furnace 4A and the second combustion furnace 4B to ignite them, and the biomass in the first combustion furnace 4A and the second combustion furnace 4B. For example, initial combustion for about 10 minutes is performed so that the fuel burns continuously, and the ignition burners 41A and 41B are extinguished.

  For example, by the time the initial combustion is completed, a raw material of biomass fuel is prepared in the raw material hopper 18, and the raw material is conveyed from the raw material hopper 18 by the screw-type conveyor 19 into the rotary cylinder 1 through the rotary damper 16. throw into. Moreover, the rotation of the rotating cylindrical body 1 is started, and the fans and conveyors of the respective parts are set in an operating state.

  The flame and heat generated in the first combustion furnace 4A and the second combustion furnace 4B are the heat receiving portion 1SA of the rotating cylindrical body 1 in front of the outlet of the flames of the first combustion furnace 4A and the second combustion furnace 4B. 1SB is heated and spreads in the first gap 21. Thereby, the rotating cylindrical body 1 is heated.

  The raw material in the rotating cylindrical body 1 is placed on a protrusion 1 </ b> C formed in a spiral shape on the inner wall surface of the rotating cylindrical body 1 while receiving heat from the rotating cylindrical body and being dried. Accordingly, it is guided upward toward the second end 1B opposite to the first end 1A of the rotating cylindrical body 1 while repeating the action of being carried upward and sliding down the protrusion 1C.

  In the process in which the raw material is dried in the rotating cylindrical body 1, the air taken in from the air inlet 23 reaches the first flow path 35 through the second gap 22, and from the first flow path 35. It is fed into the rotating cylindrical body 1 on the second end 1B side.

  Since the second flow path 5 is connected to the first end 1A of the rotating cylindrical body 1 and the fan 55 is provided in the second flow path 5, the gas gas in the rotating cylindrical body 1 is provided. Is taken into the pipe 52 and the fan 55 in the heating chamber 51 from the second flow path 5. Since the second flow path 5 is branched into the second flow path 5A and the second flow path 5B on the downstream side of the fan 55, a part of the gas gas passes through the second flow path 5B. The remaining gas gas is sent to the first combustion furnace 4A via the second flow path 5A.

  In addition, since the second flow path 5A on the first combustion furnace 4A side is branched and the fourth flow path 5C is connected, a part of the gas gas that has arrived through the second flow path 5A is The second flow path 5A is directly put into the first combustion furnace 4A. The gas gas branched into the fourth flow path 5C is sent to the heating chamber 51, and the gas gas flowing through the second flow path 5 is heated in the chamber 53 of the heating chamber 51, and from the chamber 53 of the heating chamber 51, It is discharged to the first gap 21 through the pipe 56.

  In the above, since the second flow path 5A, the second flow path 5B, and the fourth flow path 5C pass through the first gap 21, the gas gas in these flow paths is heated. For this reason, the gas gas discharged | emitted from the 4th flow path 5C to the 1st clearance gap 21 becomes 250 degreeC or more in general, and an odor will be reduced extremely. Further, since the gas gas in the second flow path 5A and the second flow path 5B is input to the first combustion furnace 4A and the first combustion furnace 4B and used for incineration, the temperature in the incinerator is 600. Odor is almost eliminated because it is higher than ℃.

  The hot gas deodorized as described above is guided and discharged from the first gap 21 to the third flow path 6 and further to the exhaust dust collector 61 by the exhaust fan 67.

  Biomass fuel obtained by drying the raw material in the rotary cylindrical body 1 discharged from the dry matter discharge port provided on the second end 1B side in the rotary cylindrical body 1 is passed through the transfer chamber 63 during the third period. Since further drying processing is performed by the hot gas in the flow path 6 and discharged, a biomass fuel with less moisture can be obtained.

  In the present embodiment, the biomass fuel discharged from the screw conveyor 62 can be accumulated in, for example, a stacker and used as the fuel of the apparatus of the present embodiment. In this case, the terminal end of the screw conveyor 62 and the upper opening of the container portion 43 of the charging device 42 may be communicated with each other through a dry material conveyance path such as a conveyor.

DESCRIPTION OF SYMBOLS 1 Rotating cylindrical body 1SA, 1SB Heat receiving part 2 1st cylinder 3 2nd cylinder 4A 1st combustion furnace 4B 2nd combustion furnace 5 2nd flow path 5A 2nd flow path 5B 2nd Channel 5C Fourth channel 6 Third channel 11 Bearing 12 Flange 12A Roller 13 Chain 14 Motor 15 Sprocket 16 Rotary damper 17 Skip conveyor 18 Raw material hopper 19 Conveyor 21 First gap 22 Second gap 23 Air intake Inlet 31A Conveyor 32A Incineration ash stacker 35 Flow path 41A Ignition burner 42 Input device 47 Screw conveyor 48A Screw conveyor 51 Heating chamber 54 Dust collector 55 Fan 61 Exhaust dust collector 62 Screw conveyor 63 Transport chamber 66 Exhaust fan 67 Exhaust fan

Claims (9)

A rotating cylindrical body having a cylindrical shape, and a raw material for biomass fuel is introduced from a first end of the rotating cylindrical body, and has a protrusion formed in a spiral shape on the inner wall surface, and rotates itself. The rotating cylinder that guides the raw material to the second end side opposite to the first end of the rotating cylinder by the protrusions and discharges the raw material from the dried product discharge port as dry biomass fuel, ,
A first gap is formed between the outer wall of the rotating cylinder and the outer wall of the rotating cylinder, and the first gap is formed in the vicinity of the first end and in the vicinity of the second end. A first cylinder for sealing;
Air that surrounds the outer wall of the first cylinder and forms a second gap with the outer wall of the first cylinder, and that takes air into the second gap near the first end. A second cylindrical body having an intake and in which the second gap is sealed in the vicinity of the second end;
A first flow path for taking in air in the second gap in the vicinity of the second end, and feeding the air into the rotary cylinder from the second end;
A combustion furnace for burning biomass fuel, the combustion furnace supplying heat from combustion to the outer wall of the rotating cylindrical body, and sending hot gas from combustion into the first gap;
A second flow path for taking in gaseous gas flowing from the second end side to the first end side in the rotating cylindrical body from the vicinity of the first end and sending it into the combustion furnace;
A hot gas flowing from the first end portion side to the second end portion side in the first gap is taken in from the vicinity of the second end portion in the first gap and sent to an exhaust dust collector. ; and a flow path,
A transport chamber having transport means for transporting the dry material in a direction away from the rotating cylindrical body communicates with the dry matter discharge port, and a part of the third flow path surrounds the transport chamber. Provided,
The biomass fuel drying apparatus according to claim 1, wherein the dry matter transported in the transport chamber is heated by hot gas flowing through the third flow path . In the middle of the second flow path, a heating chamber having a chamber that surrounds the second flow path in the center by disposing the second flow path at the center is provided.
The second flow path is disposed so that a gas gas passing through the second flow path flows through the center of the heating chamber and then passes through the first gap, and the first gap The gas gas in the second flow path is heated so as to be guided to a chamber surrounding the second flow path in the center of the heating chamber, and flows through the second flow path in the heating chamber. The biomass fuel drying apparatus according to claim 1, wherein the gas gas is heated . A fan for drawing gas gas from the vicinity of the first end in the rotating cylinder is provided downstream of the heating chamber in the second flow path. Item 3. The biomass fuel drying apparatus according to Item 2 . In the second flow path, the downstream side of the fan is an arc-shaped flow path that passes through the first gap in a circular arc that is coaxial with the rotating cylindrical body, and the second flow path. The biomass fuel drying apparatus according to claim 3, wherein the gas gas flowing through the gas is heated by hot air in the first gap . The gas gas that has passed through the arc-shaped channel is led to the heating chamber again through the fourth channel that passes through the first gap in a circular arc that is coaxial with the rotating cylindrical body, The biomass fuel drying apparatus according to claim 4 , wherein the gas gas flowing through the second flow path is heated indoors . The outer wall of the rotating cylindrical body has a spirally formed protrusion, and slows the flow of hot gas flowing in the first gap toward the second end. Item 6. The biomass fuel drying apparatus according to any one of Items 1 to 5 . The biomass fuel drying apparatus according to any one of claims 1 to 6, further comprising a charging device including a fuel conveyance path for feeding biomass fuel to the combustion furnace . The dry matter discharge port communicates with a transfer chamber provided with transfer means for transferring the dry matter in a direction away from the rotating cylindrical body,
The biomass fuel drying apparatus according to claim 7, further comprising a dried material conveyance path for conveying dried material from a terminal end of the conveyance chamber to the charging device. The biomass fuel drying apparatus according to any one of claims 1 to 8 , wherein two combustion furnaces are provided .

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