JP2013108699A - Fluidized bed dryer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve drying efficiency by preventing a failure in moving moist fuel between fluidized beds, in a fluidized bed dryer.SOLUTION: This fluidized bed dryer includes: a drying container 101 having a raw coal supply port 102 and a dried coal discharge port 103; a fluidization vapor supplying section 104 forming a fluidized bed S with the raw coal by supplying the fluidization vapor to a lower section of the drying container 101; a heat transfer tube 106 for heating the raw coal of the fluidized bed S; partitioning plates 114, 115 dividing the fluidized bed S into several parts in the raw coal flowing direction, and provided with raw coal passing openings 116, 117 at the bottom; adjustment plates 121, 122 for adjusting heights (opening areas) of the passing openings 116, 117; a pressure sensor 125a for detecting a pressure P1 at a lower section of the fluidized bed S1, and a control device 126 determining poor passing of the passing opening 116 when the pressure P1 at the bottom of the fluidized bed S1 detected by the pressure sensor 125a becomes higher than a preset certain pressure, and increasing the heights of the passing openings 116, 117 by the adjustment plates 121, 122.

Description

  The present invention relates to a fluidized bed drying apparatus for drying a material to be dried by fluidizing steam or fluidizing gas.

  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 cycle power generation facility has a great merit that it can use coal with abundant resources, and it is known that the merit can be further increased by expanding the applicable coal types.

  Conventional coal gasification combined power generation facilities generally have a coal supply device, a drying device, a coal gasification furnace, a gas purification device, a gas turbine facility, a steam turbine facility, an exhaust heat recovery boiler, a gas purification device, and the like. ing. Therefore, the coal is dried and then pulverized, supplied to the coal gasifier as pulverized coal, and air is taken in. The coal gas is combusted and gasified in this coal gasifier, and the product gas (combustible) Gas) is produced. Then, the product gas is purified and then supplied to the gas turbine equipment to burn and generate high-temperature and high-pressure combustion gas to drive the turbine. The exhaust gas after driving the turbine recovers thermal energy by the exhaust heat recovery boiler, generates steam and supplies it to the steam turbine equipment, and drives the turbine. As a result, power generation is performed. On the other hand, the exhaust gas from which the thermal energy has been recovered is released into the atmosphere through a chimney after harmful substances are removed by the gas purification device.

  By the way, the coal used in such a coal gasification combined power generation facility is not only a high-grade coal (high-grade coal) having a high calorific value such as bituminous coal and anthracite, but also a comparison such as sub-bituminous coal and lignite. There is a low-grade coal (low-grade coal) with a low calorific value. This low-grade coal has a large amount of moisture to be brought in, and the power generation efficiency decreases due to this moisture. For this reason, in the case of low-grade coal, it is necessary to dry the coal with the above-described drying apparatus to remove moisture and then pulverize and supply the coal gasifier.

  As a drying apparatus for drying such coal, there is one described in Patent Document 1 below. The multi-chamber fluidized bed classifier described in Patent Document 1 includes a fluidized bed on the upper side of a wind box via a perforated plate type gas dispersion plate, and the chamber is partitioned into a drying chamber and a classification chamber by a partition plate. , A communication passage is formed under the partition plate, and fluidized gas having a role as hot air for drying and a role as classification gas can be supplied to the wind box, and the amount of gas supplied into the classification chamber is reduced. It adjusts and controls the classification particle diameter, and adjusts the air volume and / or temperature of the gas supplied into the drying chamber.

JP 2000-197854 A

  In the conventional multi-chamber fluidized bed classifying apparatus described above, the fluidized bed is divided into a drying chamber and a classification chamber by a partition plate, and a communication passage is formed below the partition plate. Yes. However, the low-grade coal as described above has a higher moisture content than the high-grade coal, and thus is difficult to dry. Therefore, it is important to appropriately control the residence time of coal in the drying apparatus. In this case, it is preferable to narrow the gap at the lower part of the partition plate. On the other hand, if the gap is too narrow, the height of coal in the fluidized bed is increased, leading to flow instability and increased scattered particles. . For this reason, it is important to optimize the gap according to the coal supply conditions. Patent Document 1 describes adjusting the gap at the bottom of the partition plate, but this adjustment is performed in advance and prevents back-mixing. In addition, when water vapor is used for drying low-grade coal, the water vapor condenses on the raw material particles immediately after charging, forming aggregated particles, which may cause poor flow.

  The present invention solves the above-described problems, and an object of the present invention is to provide a fluidized bed drying apparatus that can improve the drying efficiency by suppressing the poor movement of wet fuel between fluidized layers.

  In order to achieve the above object, the fluidized bed drying apparatus according to the present invention is capable of supplying wet fuel from the wet fuel supply section on one end side and drying the wet fuel heated and dried from the dry matter discharge section on the other end side. A dry container having a hollow shape capable of discharging an object, and a fluidized steam or fluidized gas supply unit that forms a fluidized bed with wet fuel by supplying fluidized steam or fluidized gas to a part of the dry container; A heating unit that heats the wet fuel in the fluidized bed, a partition plate that divides the fluidized bed into a plurality of wet fuel flow directions and forms a wet fuel passage opening, and a wet that passes through the passage opening. A passage amount adjusting device capable of adjusting a fuel passage amount, a passage failure detection device for detecting a passage failure of wet fuel in the passage opening, and the passage failure detection device when the passage failure detection device detects a passage failure of wet fuel; Passing amount A control device for increasing the throughput of the wet fuel by settling device and is characterized in that it comprises.

  Accordingly, the fluidized bed is divided into a plurality of wet fuel flow directions by the partition plate to form a wet fuel passage opening in the partition plate, and when the wet fuel passage failure is detected in the passage opening, By increasing the amount of passage, it is possible to quickly eliminate the defective passage of the wet fuel at the passage opening and improve the drying efficiency of the wet fuel.

  In the fluidized bed drying apparatus of the present invention, the passing amount adjusting device has an adjusting plate capable of adjusting an opening area of the passing opening.

  Therefore, by providing an adjustment plate that can adjust the opening area of the passage opening, the amount of wet fuel passing through the passage opening can be easily adjusted.

  In the fluidized bed drying apparatus of the present invention, the defective passage detection device detects that the wet fuel does not pass correctly when a pressure or temperature deviation in the vicinity of the passage opening in the fluidized bed is larger than a predetermined width. It is characterized by judging.

  Therefore, when the pressure or temperature deviation in the vicinity of the passage opening in the fluidized bed becomes larger than the predetermined width, it is determined that the wet fuel does not pass, so that only the pressure sensor or temperature sensor is provided in the fluidized bed. It is possible to determine defective passage of parts, and to suppress an increase in product cost.

  In the fluidized bed drying apparatus of the present invention, the passage failure detection device determines that the wet fuel has failed to pass when the height of the fluidized bed is higher than a predetermined height set in advance.

  Therefore, when the fluidized bed height is higher than the predetermined height, it is determined that the wet fuel does not pass properly. By detecting the fluidized bed height, it is possible to easily determine the passing failure of the passage opening. Can do.

  In the fluidized bed drying apparatus of the present invention, the passage failure detection device determines that the wet fuel does not pass when a deviation in height of the plurality of fluidized beds is larger than a predetermined deviation set in advance. It is said.

  Therefore, it is possible to easily pass through the opening by detecting the height of each fluidized bed by determining that the wet fuel does not pass when the height deviation of the plurality of fluidized beds exceeds a predetermined deviation. Defects can be determined.

  In the fluidized bed drying apparatus of the present invention, the passing amount adjusting device has an adjusting device capable of adjusting the rotational speed of a rotary valve provided in the passing opening.

  Therefore, the amount of wet fuel passing through the passage opening can be easily adjusted by making it possible to adjust the rotational speed of the rotary valve provided in the passage opening.

  In the fluidized bed drying apparatus of the present invention, the control device, when the passage amount of the wet fuel is not eliminated by increasing the passage amount of the wet fuel by the passage amount adjusting device, the wet fuel input amount reducing process, the dried matter It is characterized in that any one of the discharge amount increasing process, the fluidized steam or fluidized gas supply amount increasing process, and the heating temperature increasing process by the heating unit is executed.

  Therefore, when the defective passage of the wet fuel at the passage opening is not solved, the poor passage at the passage opening can be surely solved by executing various processes.

  According to the fluidized bed drying apparatus of the present invention, the fluidized bed is divided into a plurality of wet fuel flow directions and a partition plate that forms a wet fuel passage opening, and the amount of wet fuel passing through the passage opening is determined. An adjustable passage amount adjustment device, a passage failure detection device that detects a passage failure of wet fuel at the passage opening, and a passage amount adjustment device that detects the passage of wet fuel when the passage failure detection device detects a passage failure of wet fuel. Since the control device for increasing the passage amount is provided, it is possible to quickly eliminate the defective passage of the wet fuel at the passage opening and to improve the drying efficiency of the wet fuel.

FIG. 1 is a schematic side view showing a fluidized bed drying apparatus according to Embodiment 1 of the present invention. FIG. 2 is a schematic rear view illustrating the fluidized bed drying apparatus according to the first embodiment. FIG. 3 is a schematic diagram illustrating a control method of the gap height in the fluidized bed drying apparatus of the first embodiment. FIG. 4 is a schematic configuration diagram of a coal gasification combined power generation facility to which the fluidized bed drying apparatus of Example 1 is applied. FIG. 5 is a schematic diagram illustrating a fluidized bed drying apparatus according to Embodiment 2 of the present invention. FIG. 6 is a schematic diagram showing a fluidized bed drying apparatus according to Example 3 of the present invention. FIG. 7 is a schematic diagram showing a fluidized bed drying apparatus according to Example 4 of the present invention.

  Exemplary embodiments of a fluidized bed drying apparatus according to the present invention will be described below in detail with reference to the accompanying drawings. In addition, this invention is not limited by this Example, Moreover, when there exists multiple Example, what comprises combining each Example is also included.

  1 is a schematic side view showing a fluidized bed drying apparatus according to Example 1 of the present invention, FIG. 2 is a schematic rear view showing the fluidized bed drying apparatus of Example 1, and FIG. 3 is a fluidized bed of Example 1. FIG. 4 is a schematic diagram illustrating a control method of the gap height in the drying device, and FIG. 4 is a schematic configuration diagram of a coal gasification combined power generation facility to which the fluidized bed drying device of Example 1 is applied.

  The coal gasification combined power generation facility (IGCC: Integrated Coal Gasification Combined Cycle) of Example 1 adopts an air combustion method in which coal gas is generated in a gasification furnace using air as an oxidizer, and is purified by a gas purifier. Coal gas is supplied as fuel gas to gas turbine equipment to generate electricity. That is, the combined coal gasification combined power generation facility of this embodiment is a power generation facility of an air combustion system (air blowing). In this case, low-grade coal is used as the wet fuel supplied to the gasifier.

  In Example 1, as shown in FIG. 4, the coal gasification combined power generation facility 10 includes a coal supply device 11, a fluidized bed drying device 12, a pulverized coal machine (mill) 13, a coal gasification furnace 14, and a char recovery device 15. , A gas refining device 16, a gas turbine facility 17, a steam turbine facility 18, a generator 19, and a heat recovery steam generator (HRSG) 20.

  The coal feeder 11 includes a raw coal bunker 21, a coal feeder 22, and a crusher 23. The raw coal bunker 21 can store low-grade coal, and can drop a predetermined amount of low-grade coal into the coal feeder 22. The coal feeder 22 can transport the low-grade coal dropped from the raw coal bunker 21 by a conveyor or the like and drop it on the crusher 23. The crusher 23 can crush the dropped low-grade coal into a predetermined size.

  The fluidized bed drying device 12 supplies drying steam (superheated steam) to the low-grade coal introduced by the coal feeder 11 so as to heat and dry the low-grade coal while flowing. Moisture contained in the graded coal can be removed. The fluidized bed drying device 12 is provided with a cooler 31 for cooling the dried low-grade coal taken out from the lower portion, and the dried and cooled dried coal is stored in the dried coal bunker 32. Further, the fluidized bed drying apparatus 12 is provided with a dry coal cyclone 33 and a dry coal electrostatic precipitator 34 for separating dry coal particles from steam taken out from above, and the dry coal particles separated from the steam are dried coal bunker. 32 is stored. The steam from which the dry coal has been separated by the dry coal electrostatic precipitator 34 is compressed by the steam compressor 35 and then supplied to the fluidized bed drying device 12 as drying steam.

  The pulverized coal machine 13 is a coal pulverizer, and pulverizes the low-grade coal (dried coal) dried by the fluidized bed dryer 12 into fine particles to produce pulverized coal. That is, in the pulverized coal machine 13, the dry coal stored in the dry coal bunker 32 is dropped by the coal feeder 36, and the dry coal is converted into low-grade coal having a predetermined particle size or less, that is, pulverized coal. The pulverized coal after being pulverized by the pulverized coal machine 13 is separated from the conveying gas by the pulverized coal bag filters 37a and 37b and stored in the pulverized coal supply hoppers 38a and 38b.

  The coal gasification furnace 14 can supply pulverized coal processed by the pulverized coal machine 13 and can be recycled by returning the char (unburned coal) recovered by the char recovery device 15. .

  That is, the coal gasification furnace 14 is connected to the compressed air supply line 41 from the gas turbine equipment 17 (compressor 61), and can supply compressed air compressed by the gas turbine equipment 17. The air separation device 42 separates and generates nitrogen and oxygen from air in the atmosphere. A first nitrogen supply line 43 is connected to the coal gasifier 14, and a pulverized coal supply hopper is connected to the first nitrogen supply line 43. Charging lines 44a and 44b from 38a and 38b are connected. The second nitrogen supply line 45 is also connected to the coal gasification furnace 14, and the char return line 46 from the char recovery device 15 is connected to the second nitrogen supply line 45. Further, the oxygen supply line 47 is connected to the compressed air supply line 41. In this case, nitrogen is used as a carrier gas for coal and char, and oxygen is used as an oxidant.

  The coal gasification furnace 14 is, for example, a spouted bed type gasification furnace, which combusts and gasifies coal, char, air (oxygen) supplied therein or water vapor as a gasifying agent, and produces carbon dioxide. A combustible gas (product gas, coal gas) containing carbon as a main component is generated, and a gasification reaction takes place using this combustible gas as a gasifying agent. The coal gasification furnace 14 is provided with a foreign matter removing device 48 that removes foreign matter mixed with pulverized coal. In this case, the coal gasification furnace 14 is not limited to the spouted bed gasification furnace, and may be a fluidized bed gasification furnace or a fixed bed gasification furnace. The coal gasification furnace 14 is provided with a gas generation line 49 for combustible gas toward the char recovery device 15, and can discharge combustible gas containing char. In this case, by providing a gas cooler in the gas generation line 49, the combustible gas may be cooled to a predetermined temperature and then supplied to the char recovery device 15.

  The char recovery device 15 includes a dust collector 51 and a supply hopper 52. In this case, the dust collector 51 is constituted by one or a plurality of bag filters or cyclones, and can separate char contained in the combustible gas generated in the coal gasification furnace 14. The combustible gas from which the char has been separated is sent to the gas purification device 16 through the gas discharge line 53. The supply hopper 52 stores the char separated from the combustible gas by the dust collector 51. A bin may be disposed between the dust collector 51 and the supply hopper 52, and a plurality of supply hoppers 52 may be connected to the bin. A char return line 46 from the supply hopper 52 is connected to the second nitrogen supply line 45.

The gas purification device 16 performs gas purification by removing impurities such as sulfur compounds and nitrogen compounds from the combustible gas from which the char has been separated by the char recovery device 15. The gas purifier 16 purifies the combustible gas to produce fuel gas and supplies it to the gas turbine equipment 17. In the gas purifier 16, since the combustible gas from which the char is separated still contains sulfur (H ₂ S), the sulfur is finally removed by removing it with the amine absorbent. Is recovered as gypsum and used effectively.

  The gas turbine equipment 17 includes a compressor 61, a combustor 62, and a turbine 63, and the compressor 61 and the turbine 63 are connected by a rotating shaft 64. The combustor 62 has a compressed air supply line 65 connected to the compressor 61, a fuel gas supply line 66 connected to the gas purifier 16, and a combustion gas supply line 67 connected to the turbine 63. Further, the gas turbine equipment 17 is provided with a compressed air supply line 41 extending from the compressor 61 to the coal gasification furnace 14, and a booster 68 is provided in the middle. Therefore, in the combustor 62, the compressed air supplied from the compressor 61 and the fuel gas supplied from the gas purifier 16 are mixed and burned, and the rotating shaft 64 is rotated by the generated combustion gas in the turbine 63. By doing so, the generator 19 can be driven.

  The steam turbine facility 18 includes a turbine 69 that is coupled to the rotating shaft 64 in the gas turbine facility 17, and the generator 19 is coupled to the base end portion of the rotating shaft 64. The exhaust heat recovery boiler 20 is provided in the exhaust gas line 70 from the gas turbine equipment 17 (the turbine 63), and generates steam by exchanging heat between the air and the high temperature exhaust gas. Therefore, the exhaust heat recovery boiler 20 is provided with the steam supply line 71 between the steam turbine equipment 18 and the turbine 69 of the steam turbine equipment 18, the steam recovery line 72 is provided, and the steam recovery line 72 is provided with the condenser 73. Yes. Therefore, in the steam turbine facility 18, the turbine 69 is driven by the steam supplied from the exhaust heat recovery boiler 20, and the generator 19 can be driven by rotating the rotating shaft 64.

  The exhaust gas from which heat has been recovered by the exhaust heat recovery boiler 20 is freed of harmful substances by the gas purification device 74, and the purified exhaust gas is discharged from the chimney 75 to the atmosphere.

  Here, the action | operation of the coal gasification combined cycle power generation equipment 10 of Example 1 is demonstrated.

  In the coal gasification combined power generation facility 10 of the first embodiment, raw coal (low-grade coal) is stored in the raw coal bunker 21 by the coal feeder 11, and the low-grade coal of the raw coal bunker 21 is supplied to the coal. The machine 22 drops the crusher 23 where it is crushed to a predetermined size. The crushed low-grade coal is heated and dried by the fluidized bed drying device 12, cooled by the cooler 31, and stored in the dry coal bunker 32. Further, the steam taken out from the upper part of the fluidized bed drying device 12 is separated into dry coal particles by the dry coal cyclone 33 and the dry coal electrostatic precipitator 34 and compressed by the steam compressor 35 before being supplied to the fluidized bed drying device 12. Returned as drying steam. On the other hand, the dry coal particles separated from the steam are stored in the dry coal bunker 32.

  The dry coal stored in the dry coal bunker 32 is fed into the pulverized coal machine 13 by the coal feeder 36, where it is pulverized into fine particles to produce pulverized coal, and through the pulverized coal bag filters 37a and 37b. And stored in the pulverized coal supply hoppers 38a and 38b. The pulverized coal stored in the pulverized coal supply hoppers 38 a and 38 b is supplied to the coal gasification furnace 14 through the first nitrogen supply line 43 by nitrogen supplied from the air separation device 42. Further, the char recovered by the char recovery device 15 described later is supplied to the coal gasifier 14 through the second nitrogen supply line 45 by nitrogen supplied from the air separation device 42. Further, the compressed air extracted from the gas turbine equipment 17 to be described later is boosted by the booster 68 and then supplied to the coal gasification furnace 14 through the compressed air supply line 41 together with oxygen supplied from the air separation device 42.

  In the coal gasification furnace 14, the supplied pulverized coal and char are combusted by compressed air (oxygen), and the pulverized coal and char are gasified to generate combustible gas (coal gas) mainly composed of carbon dioxide. Can be generated. The combustible gas is discharged from the coal gasifier 14 through the gas generation line 49 and sent to the char recovery device 15.

  In the char recovery device 15, the combustible gas is first supplied to the dust collector 51, whereby the char contained in the gas is separated from the combustible gas. The combustible gas from which the char has been separated is sent to the gas purification device 16 through the gas discharge line 53. On the other hand, the fine char separated from the combustible gas is deposited on the supply hopper 52, returned to the coal gasifier 14 through the char return line 46, and recycled.

  The combustible gas from which the char has been separated by the char recovery device 15 is subjected to gas purification by removing impurities such as sulfur compounds and nitrogen compounds in the gas purification device 16 to produce fuel gas. In the gas turbine facility 17, when the compressor 61 generates compressed air and supplies the compressed air to the combustor 62, the combustor 62 is supplied from the compressed air supplied from the compressor 61 and the gas purification device 16. Combustion gas is generated by mixing with fuel gas and combusting, and the turbine 63 is driven by this combustion gas, so that the generator 19 can be driven via the rotating shaft 64 to generate power.

  The exhaust gas discharged from the turbine 63 in the gas turbine equipment 17 generates steam by exchanging heat with air in the exhaust heat recovery boiler 20, and supplies the generated steam to the steam turbine equipment 18. . In the steam turbine facility 18, the generator 69 can be driven through the rotating shaft 64 to generate electric power by driving the turbine 69 with the steam supplied from the exhaust heat recovery boiler 20.

  Thereafter, in the gas purification device 74, harmful substances in the exhaust gas discharged from the exhaust heat recovery boiler 20 are removed, and the purified exhaust gas is discharged from the chimney 75 to the atmosphere.

  Hereinafter, the fluidized bed drying apparatus 12 in the coal gasification combined power generation facility 10 described above will be described in detail.

  The fluidized bed drying apparatus 12 is a plug flow type drying apparatus, and as shown in FIGS. 1 and 2, a drying container 101, a raw coal charging port 102, a dry coal discharging port 103, a fluidized steam ( Fluidized gas) supply section 104 (104a, 104b, 104c), gas discharge port 105, and heat transfer tubes (heating sections) 106, 107, 108 are provided.

  The drying container 101 has a hollow box shape, and a raw coal charging port 102 for charging raw coal is formed on one end side, and a dried product obtained by heating and drying raw coal is discharged to the lower portion on the other end side. A dry charcoal discharge port 103 is formed. In this case, the raw coal input port 102 and the dry coal discharge port 103 are provided one by one at the end of the drying container 101, but a plurality of them may be provided. In this case, the drying container 101 can adjust the amount of raw coal supplied from the raw coal inlet 102 to the inside by the coal feeder 22 (see FIG. 4). Moreover, the dry container 101 can adjust raw coal discharge | emission amount by adjusting the rotation speed of the rotary valve which is not shown in the dry charcoal discharge port 103 provided.

  Further, the drying container 101 is provided with a dispersion plate 109 having a plurality of openings at a predetermined distance from the bottom plate 101a in the lower portion, so that the wind box 110 is partitioned. The drying container 101 is provided with a fluidized steam supply unit 104 (104a, 104b, 104c) that supplies fluidized steam (superheated steam) to the bottom plate 101a via the wind box 110 and above the dispersion plate 109. Yes. Further, in the drying container 101, a gas discharge port 105 for discharging fluidized steam and generated steam is formed in the ceiling plate 101b on the dry coal discharge port 103 side.

  The drying container 101 is supplied with raw coal from the raw coal inlet 102 and fluidized steam is supplied from the fluidized steam supply unit 104 through the wind box 110 and the dispersion plate 109, thereby A fluidized bed S having a predetermined thickness is formed above, and a free board portion F is formed above the fluidized bed S.

  The drying container 101 includes a first drying chamber 111 provided on the upstream side in the flow direction of the raw coal, a second drying chamber 112 provided on the downstream side of the first drying chamber 111, and raw coal. And the third drying chamber 113 provided on the most downstream side in the flow direction.

  More specifically, in the drying container 101, the fluidized bed S is divided into a plurality of (in this embodiment, two) partition plates 114 and 115 in the flow direction of the raw coal. Charcoal passage openings 116 and 117 are formed. The partition plates 114 and 115 are arranged along a vertical direction orthogonal to the flow direction of the raw coal, and are arranged at predetermined intervals in the flow direction of the raw coal. It is attached to the inner wall surface. Each of the partition plates 114 and 115 has a passage opening 116 and 117 having a predetermined height (opening area) at an intermediate portion in the vertical direction, and an upper end portion extends upward from the fluidized bed S. The lower end is in contact with the dispersion plate 109. The passage openings 116 and 117 are set to substantially the same height.

  As described above, the drying container 101 is divided into the first drying chamber 111, the second drying chamber 112, and the third drying chamber 113 by providing the partition plates 114 and 115. The drying chambers 111, 112, and 113 are In addition, communication is made above the partition plates 114 and 115. In this case, the first drying chamber 111 is a region in which the freeboard portion F1 and the fluidized bed S1 are formed to perform initial drying of the raw coal, and the second drying chamber 112 is the freeboard portion F2 and the fluidized bed S2. Is formed, and is an area where medium-term drying of the raw coal is performed, and the third drying chamber 113 is an area where the freeboard portion F3 and the fluidized bed S3 are formed and the latter drying of the raw coal is performed. In this case, the drying chambers 111, 112, and 113 are set to have substantially the same floor area, but may be set to an optimum ratio according to the moisture content of raw coal.

  The wind box 110 is divided into three wind boxes 110a, 110b, and 110c by partition members 118 and 119 so as to correspond to the three drying chambers 111, 112, and 113, and the three wind boxes 110a, 110b, Three fluidized steam supply sections 104a, 104b, and 104c are provided so as to correspond to 110c. That is, the partition members 118 and 119 are disposed below the partition plates 114 and 115. The fluidized steam supply units 104a, 104b, and 104c are connected to a fluidized steam supply pipe (not shown). By adjusting the opening of the flow rate adjustment valve provided in the fluidized steam supply pipe, the wind box The amount of fluidized steam supplied to 110a, 110b, 110c can be adjusted.

  That is, the drying container 101 is configured as a plug flow system so that the supplied raw coal is pushed out in the room. This extruding flow is a flow for extruding the raw coal in the fluidizing direction so that the raw coal does not diffuse in the fluidizing direction in the fluidized bed S.

  Further, the drying container 101 is provided with a plurality of heat transfer tubes 106, 107, and 108 that pass through the drying container 101 from the outside and circulate in the fluidized beds S1, S2, and S3 in the drying chambers 111, 112, and 113, respectively. Has been. The heat transfer tubes 106, 107, 108 are positioned so as to be embedded in the fluidized beds S1, S2, S3, and the raw coals of the fluidized beds S1, S2, S3 are heated and dried by the superheated steam flowing inside. can do. In this case, the temperature of the heat transfer tubes 106, 107, 108 can be adjusted by changing the pressure of the supplied superheated steam.

  Therefore, the raw coal supplied to the first drying chamber 111 is fluidized by the fluidized steam and heated by the heat transfer tube 106 to be dried. The raw coal initially dried in the first drying chamber 111 is moved to the second drying chamber 112 through the passage opening 116 below the partition plate 114, and is heated by the heat transfer tube 107 here. Medium-term dry. The raw coal dried in the second drying chamber 112 is moved to the third drying chamber 113 through the passage opening 117 at the bottom of the partition plate 115, where it is heated by the heat transfer tube 108. Late drying.

  Thereby, the raw coal forming the fluidized beds S1, S2, and S3 of the drying chambers 111, 112, and 113 sequentially moves between the fluidized beds S1, S2, and S3 from the upstream side through the passage openings 116 and 117. By doing so, it can be made an extruded flow, and it is dried without being diffused in the flow direction.

  By the way, the fluidized bed drying apparatus 12 of the present embodiment is a passage amount adjusting device capable of adjusting the passage amount of raw coal passing through the passage opening portions 116 and 117, and the height (opening area) of the passage opening portions 116 and 117. ) Can be adjusted, and each of the adjustment plates 121 and 122 can be moved up and down with respect to the partition plates 114 and 115. That is, as shown in FIG. 3, the partition plate 114 includes an upper partition plate 114a and a lower partition plate 114b, and passage openings 116 and 117 are provided between the upper partition plate 114a and the lower partition plate 114b. . The adjustment plate 121 is disposed so as to be in close contact with the lower flat portion of the partition plate 114a of the partition plate 114, and each end portion in the width direction is supported by a guide (not shown) provided on the inner wall surface of the drying container 101 so as to be movable up and down. Has been. The drive device (drive motor) 123 is fixed to the lower portion of the drying container 101, and a screw shaft 124 that is integrally connected to the drive shaft is screwed to the adjustment plate 121.

  Therefore, the adjustment plate 121 can be moved up and down with respect to the partition plate 114 by driving the driving device 123 to rotate the screw shaft 124. That is, when the drive device 123 is driven and the adjustment plate 121 is raised by the screw shaft 124, the height of the passage opening 116 can be increased, while the drive device 123 is driven and the adjustment plate 121 is moved by the screw shaft 124. When descending, the height of the passage opening 116 can be reduced.

  In addition, the fluidized bed drying device 12 of the present embodiment is provided with pressure sensors 125a and 125b as defective passage detection devices for detecting defective passage of raw coal at the passage opening 116, and the detection results of the pressure sensors 125a and 125b. Is provided. The control device 126 detects the passage failure of the raw coal at the passage opening 116 based on the detection results of the pressure sensors 125a and 125b. When the passage failure of the raw coal is detected, the control device 126 raises the adjustment plate 121 and passes the opening. By expanding the height of the portion 116, the passing amount of raw coal is increased.

  Specifically, when raw coal is clogged and blocked in the passage opening 116, the height of the fluidized bed S1 increases, and the pressure below the fluidized bed S1, that is, the pressure P1 detected by the pressure sensor 125a increases. On the other hand, the pressure of the free board portion F1, that is, the pressure P0 detected by the pressure sensor 125b is substantially constant regardless of the height of the fluidized bed S1. Therefore, when the pressure P1 in the lower part of the fluidized bed S1 detected by the pressure sensor 125a is higher than a predetermined pressure set in advance, it is determined that the passage opening 116 is defective. In this case, since the appropriate pressure in the lower part of the fluidized bed S1 differs depending on the form of the fluidized bed drying device 12, the pressure P1 in the lower part of the fluidized bed S1 detected by the pressure sensor 125a and the pressure sensor 125b detected. When the deviation from the pressure P0 of the free board part F1 becomes higher than a predetermined deviation set in advance, it is determined that the passage opening 116 is defective in passage.

  Although the adjustment plate 121 provided in the passage opening 116 has been described in detail here, the adjustment plate 122 provided in the passage opening 117 has the same configuration, and a drive device, a pressure sensor, and the like are provided. It is provided and can be controlled by the control device 126. In the above description, the control device 126 is configured to detect a raw coal passage failure in the passage opening 116 based on the detection results of the pressure sensors 125a and 125b. When generation | occurrence | production of the passage defect of the raw coal in the passage opening part 116 is estimated based on the detection result of 125a, 125b, you may make it raise the adjustment board 121 and widen the height of the passage opening part 116. FIG.

  Further, in the fluidized bed drying apparatus 12 of the present embodiment, when the control device 126 raises the adjustment plate 121 and widens the height of the passage opening 116, the raw coal input amount is not resolved even if the raw coal passage failure is not eliminated. Any one of a reduction process, a process for increasing the amount of dry matter discharged, a process for increasing the supply amount of fluidized steam, and a process for increasing the heating temperature by the heat transfer tube 106 are performed.

  Here, the whole operation | movement of the fluidized bed drying apparatus 12 of Example 1 is demonstrated.

  In the fluidized bed drying device 12, as shown in FIGS. 1 and 2, the raw coal is supplied from the raw coal inlet 102 to the drying container 101 and flows from the fluidized steam supply unit 104 through the dispersion plate 109. When the vaporized steam is supplied, fluidized beds S1, S2, and S3 having a predetermined thickness are formed above the dispersion plate 109. The raw coal moves through the fluidized beds S1, S2, and S3 to the dry coal discharge port 103 side by the fluidized steam, and at this time, the raw coal is heated and dried by receiving heat from the heat transfer tubes 106, 107, and 108.

  That is, when raw coal is supplied from the raw coal inlet 102, first, in the first drying chamber 111, fluidized steam is supplied from the fluidized steam supply unit 104 a through the dispersion plate 109, and heat is transferred from the heat transfer tube 106. By receiving, it is dried while flowing in the fluidized bed S1. Next, the raw coal that has been initially dried in the first drying chamber 111 flows into the second drying chamber 112 through the passage opening 116 of the partition plate 114. In the second drying chamber 112, fluidized steam is supplied from the fluidized steam supply unit 104 b through the dispersion plate 109 and receives heat from the heat transfer tube 107, so that it is dried while flowing in the fluidized bed S <b> 2. The raw coal that has been subjected to medium-term drying in the second drying chamber 112 flows into the third drying chamber 113 through the passage opening 117 of the partition plate 115. In the third drying chamber 113, fluidized steam is supplied from the fluidized steam supply unit 104c through the dispersion plate 109, and is also dried while flowing in the fluidized bed S3 by receiving heat from the heat transfer tube. In this way, the raw coal flows in the fluidized beds S1, S2, S3 by the fluidized steam supplied while being heated by the heat transfer tubes 106, 107, 108, and diffuses in the flow direction as an extruded flow. Without drying.

  Thereafter, the dry coal from which the raw coal has been dried is discharged to the outside through the dry coal discharge port 103, and the steam generated by heating and drying the raw coal in the fluidized bed S rises together with the fluidized steam. It flows to the discharge port 103 side and is discharged from the gas discharge port 105 to the outside.

  At this time, for example, in the first drying chamber 111, the pressure sensors 125a and 125b detect the pressure P1 below the fluidized bed S1 and the pressure P0 of the free board portion F1, and output them to the control device 126. The control device 126 determines whether the pressure P1 below the fluidized bed S1 detected by the pressure sensor 125a is higher than a predetermined pressure, specifically, the pressure P1 below the fluidized bed S1 detected by the pressure sensor 125a, and the pressure sensor. It is determined whether or not the deviation from the pressure P0 of the free board portion F1 detected by 125b is higher than a predetermined deviation. Here, the control device 126 determines that the pressure P1 in the lower part of the fluidized bed S1 is higher than a predetermined pressure, that is, the deviation between the pressure P1 in the lower part of the fluidized bed S1 and the pressure P0 in the free board part F1 is higher than the predetermined deviation. Then, it is determined that the passage opening 116 has a poor passage.

  And the control apparatus 126 raises the adjustment plate 121 by the drive apparatus 123, and increases the passage amount of raw coal by expanding the height of the passage opening part 116. FIG. The rising amount of the adjustment plate 121 is set to a predetermined amount set in advance. For example, when the passage failure of the passage opening 116 is not eliminated after a predetermined time elapses, the adjustment plate 121 is again moved to the same amount. Alternatively, the height of the passage opening 116 is increased by a smaller amount to increase the passage amount of raw coal.

  Thus, in the fluidized bed drying apparatus of Example 1, the raw coal is supplied by supplying fluidized steam to the drying container 101 having the raw coal inlet 102 and the dry coal outlet 103 and the lower part of the drying container 101. The fluidized steam supply unit 104 that forms the fluidized bed S, the heat transfer pipe 106 that heats the raw coal of the fluidized bed S, and the fluidized bed S is divided into a plurality of directions in the flow direction of the raw coal and the raw coal passes below. Partition plates 114 and 115 forming the openings 116 and 117, adjustment plates 121 and 122 capable of adjusting the heights of the passage openings 116 and 117, and a pressure sensor 125a capable of detecting the pressure P1 below the fluidized bed S1. When the pressure P1 in the lower part of the fluidized bed S1 detected by the pressure sensor 125a becomes higher than a predetermined pressure set in advance, the passage failure of the passage opening 116 is determined, and the passage openings 11 are adjusted by the adjusting plates 121 and 122. Is provided with a control unit 126 to increase the height of 117.

  Therefore, when the raw coal is clogged and blocked in the passage opening 116, the pressure P1 in the lower part of the fluidized bed S1 is increased. Therefore, when the pressure P1 in the lower part of the fluidized bed S1 becomes higher than a predetermined pressure, the passage opening The defective passage of the portions 116 and 117 is determined, and the adjustment plates 121 and 122 are raised to increase the height of the passage openings 116 and 117, and the passage failure of the raw coal at the passage openings 116 and 117 is quickly detected. It can be eliminated and the drying efficiency of raw coal can be improved.

  Further, in the fluidized bed drying apparatus of Example 1, when the pressure P1 in the lower part of the fluidized bed S1 becomes higher than a predetermined pressure, the fluidized bed S is pressurized by determining the poor passage of the passage openings 116 and 117. By simply providing the sensors 125a and 125b, it is possible to determine a passing failure of the passing openings 116 and 117, and to suppress an increase in product cost.

  FIG. 5 is a schematic diagram illustrating a fluidized bed drying apparatus according to Embodiment 2 of the present invention. In addition, the same code | symbol is attached | subjected to the member which has the function similar to the Example mentioned above, and detailed description is abbreviate | omitted.

  In Example 2, as shown in FIG. 5, the partition plate 114 is provided with an adjustment plate 121 capable of adjusting the height of the passage opening 116, and by rotating the screw shaft 124 by the driving device 123, The adjustment plate 121 can be moved up and down with respect to the partition plate 114 to adjust the height of the passage opening 116.

  In this embodiment, pressure sensors 125a, 125b, and 125c are provided, and a control device 126 that inputs detection results of the pressure sensors 125a, 125b, and 125c is provided. The control device 126 obtains the height of the fluidized bed S1 based on the detection results of the pressure sensors 125a, 125b, 125c, and when the height of the fluidized bed S1 becomes higher than a predetermined height, the raw coal When the passage failure of the raw coal is detected, the adjustment plate 121 is lifted to increase the height of the passage opening 116, thereby increasing the passage amount of the raw coal.

In this case, when raw coal is clogged and blocked in the passage opening 116, the height of the fluidized bed S1 is increased, and the pressure at the lower part of the fluidized bed S1, that is, the pressure P1 detected by the pressure sensor 125a is increased. On the other hand, the pressure of the free board portion F1, that is, the pressure P0 detected by the pressure sensor 125b is substantially constant regardless of the height of the fluidized bed S1. Further, the pressure increase amount Pa (P2-P1) per predetermined height in the fluidized bed S1 can be determined by detecting the pressure P2 by the pressure sensor 125c at a position where the pressure sensor 125a has increased by the predetermined height H0. Therefore, the height H of the fluidized bed S1 can be estimated from the following mathematical formula.
H = (P2−P0) / Pa × H0
And the control apparatus 126 determines with the passage opening part 116 being a passage defect, when the height H of the fluidized bed S1 becomes higher than predetermined height. And the passage amount of raw coal is increased by raising the adjustment plate 121 by the drive device 123 and widening the height of the passage opening 116.

  Since the control device 126 can determine the height of the fluidized bed S1 based on the detection results of the pressure sensors 125a, 125b, and 125c, similarly, the height of the fluidized bed S2 is obtained and the fluidized bed S1, When the deviation of the height of S2 becomes larger than a predetermined deviation set in advance, it may be determined that the raw coal does not pass.

  As described above, in the fluidized bed drying apparatus according to the second embodiment, the pressure sensors 125a and 125c that can detect the pressure of the fluidized bed S1, the pressure sensor 125b that can detect the pressure of the free board portion F1, and the pressure sensors. The height of the fluidized bed S1 is obtained based on the pressure P of the fluidized bed S1 detected by 125a, 125b, 125c, and when the height of the fluidized bed S1 becomes higher than a predetermined height, the passage opening 116 is obtained. And a control device 126 for determining the passage failure and increasing the height of the passage opening 116 by the adjusting plate 121.

  Accordingly, if the raw coal is clogged and blocked in the passage opening 116, the height of the fluidized bed S1 is increased. Therefore, when the height of the fluidized bed S1 is higher than a predetermined height, the passage openings 116, 117 are disposed. Is determined, and the adjustment plate 121 is raised to increase the height of the passage opening 116, and the passage failure of the raw coal in the passage opening 116 is eliminated at an early stage to improve the drying efficiency of the raw coal. can do.

  FIG. 6 is a schematic diagram showing a fluidized bed drying apparatus according to Example 3 of the present invention. In addition, the same code | symbol is attached | subjected to the member which has the function similar to the Example mentioned above, and detailed description is abbreviate | omitted.

  In the third embodiment, as shown in FIG. 6, the partition plate 114 is provided with an adjustment plate 121 capable of adjusting the height of the passage opening 116, and by rotating the screw shaft 124 by the driving device 123, The adjustment plate 121 can be moved up and down with respect to the partition plate 114 to adjust the height of the passage opening 116.

  Further, in the present embodiment, temperature sensors 131a and 131b are provided as passage failure detection devices for detecting the passage failure of raw coal in the passage opening 116, and a control device 126 for inputting the detection results of the temperature sensors 131a and 131b. Is provided. The control device 126 detects a raw coal passage failure in the passage opening 116 based on the detection results of the temperature sensors 131a and 131b, and when detecting a raw coal passage failure, the control device 126 raises the adjustment plate 121 and passes the opening. By expanding the height of the portion 116, the passing amount of raw coal is increased.

  Specifically, if the raw coal is clogged and blocked in the passage opening 116, the flow of the raw coal at the lower part of the fluidized bed S1 is reduced, and the temperature at the lower part of the fluidized bed S1, that is, the temperature detected by the temperature sensor 131a. T1 increases. On the other hand, the flow of raw coal in the upper part of the fluidized bed S1 is almost constant by the fluidized steam. Therefore, when the temperature T1 in the lower part of the fluidized bed S1 detected by the temperature sensor 131a becomes higher than a predetermined pressure set in advance, the passage opening 116 is determined to be defective. In this case, since the appropriate temperature of the lower part of the fluidized bed S1 differs depending on the form of the fluidized bed drying device 12, the pressure T1 of the lower part of the fluidized bed S1 detected by the temperature sensor 131a and the temperature sensor 131b detected. When the deviation from the pressure T2 in the upper part of the fluidized bed S1 becomes higher than a predetermined deviation set in advance, the passage opening 116 is determined to be defective.

  As described above, in the fluidized bed drying apparatus of Example 3, the pressure sensor 131a capable of detecting the temperature of the lower part of the fluidized bed S1 and the temperature of the lower part of the fluidized bed S1 detected by the temperature sensor 131a are set in advance. There is provided a control device 126 that determines whether the passage opening 116 is defective when it becomes higher than a predetermined temperature and increases the height of the passage opening 116 by the adjusting plate 121.

  Therefore, if raw coal is clogged and clogged in the passage opening 116, the temperature of the lower part of the fluidized bed S1 is increased. Therefore, when the temperature of the lower part of the fluidized bed S1 is higher than a predetermined height, the passage opening 116 is made. Is determined, and the adjustment plate 121 is raised to increase the height of the passage opening 116, and the passage failure of the raw coal in the passage opening 116 is eliminated at an early stage to improve the drying efficiency of the raw coal. can do.

  In the first to third embodiments described above, adjustment plates 121 and 122 capable of adjusting the heights of the passage openings 116 and 117 are provided as the passage amount adjustment device of the present invention, and are moved up and down by the drive device 123 and the screw shaft 124. Although it is possible, the screw shaft has a hollow shape and is connected to an inert gas supply pipe so that the inert gas is ejected from a large number of holes formed in the screw shaft, thereby attaching to the screw shaft. Raw coal can be eliminated and driving failure can be suppressed.

  FIG. 7 is a schematic diagram showing a fluidized bed drying apparatus according to Example 4 of the present invention. In addition, the same code | symbol is attached | subjected to the member which has the function similar to the Example mentioned above, and detailed description is abbreviate | omitted.

  In Example 4, as shown in FIG. 7, a rotary valve 141 is provided in the passage opening 116 as a passage amount adjusting device capable of adjusting the passage amount of the raw coal passing through the passage opening 116. The rotational speed of the rotary valve 141 can be adjusted by a driving device (adjusting device) 142. Therefore, by rotating the rotary valve 141 by the driving device 142, the raw coal of the fluidized bed S1 can be forcibly moved from the passage opening 116 to the fluidized bed S2. That is, by adjusting the rotational speed of the rotary valve 141 by the driving device 142, the amount of raw coal moving from the fluidized bed S1 to the fluidized bed S2 through the passage opening 116 can be adjusted.

  In the present embodiment, a pressure sensor 125a is provided as a passage failure detection device that detects a passage failure of raw coal in the passage opening 116, and a control device 126 that inputs a detection result of the pressure sensor 125a is provided. Yes. This control device 126 detects the poor passage of raw coal at the passage opening 116 based on the detection result of the pressure sensor 125a, and increases the rotational speed of the rotary valve 141 when the poor passage of raw coal is detected. The amount of raw coal passing through the passage opening 116 is increased.

  Specifically, the control device 126 determines that the passage opening 116 has a poor passage when the pressure P1 below the fluidized bed S1 detected by the pressure sensor 125a is higher than a predetermined pressure set in advance. . When a raw coal passage failure is detected, the rotational speed of the rotary valve 141 is increased to increase the amount of raw coal passing through the passage opening 116.

  Thus, in the fluidized bed drying apparatus of Example 4, the partition plate 114 that divides the fluidized bed S into a plurality of the raw coal in the flow direction and forms the raw coal passage opening 116 in the lower portion, and the passage opening. A rotary valve 141 provided in the section 116, a pressure sensor 125a capable of detecting a pressure P1 below the fluidized bed S1, and a pressure P1 below the fluidized bed S1 detected by the pressure sensor 125a from a predetermined pressure set in advance. There is provided a control device 126 that determines a poor passage through the passage opening 116 when it becomes high and increases the rotational speed of the rotary valve 141.

  Therefore, when the raw coal is clogged and blocked in the passage opening 116, the pressure P1 in the lower part of the fluidized bed S1 is increased. Therefore, when the pressure P1 in the lower part of the fluidized bed S1 becomes higher than a predetermined pressure, the passage opening The passage failure of the portion 116 is determined, and the rotational speed of the rotary valve 141 is increased, so that the passage failure of the raw coal at the passage opening 116 can be eliminated at an early stage, and the drying efficiency of the raw coal can be improved.

  In each of the above-described embodiments, the inside of the drying container 101 is divided into three drying chambers 111, 112, and 113, but may be two drying chambers or four or more drying chambers. Further, the configuration and arrangement of the shape of the drying container 101, the raw coal inlet 102, the dry coal outlet 103, the fluidized steam supply unit 104, the gas outlet 105, and the heat transfer tubes 106, 107, 108 are described in each embodiment. It is not limited and can be changed as appropriate according to the installation location and application of the fluidized bed drying device 12.

  Moreover, in each Example mentioned above, although low grade coal was used as a wet fuel, it is applicable even if it is high grade coal, and it is not limited to coal, but can be used as an organic resource derived from renewable organisms. For example, it is also possible to use thinned wood, waste wood, driftwood, grass, waste, sludge, tires, and recycled fuel (pellets and chips) made from these raw materials. .

  In the above-described embodiments, the fluidized steam is supplied into the drying container 101. However, air or the like may be applied as the fluidized gas. In addition, although the passage openings 116 and 117 are provided in the middle portion of the partition plates 114 and 115 in the vertical direction, the passage openings 116 and 117 may be provided in the lower portion of the partition plates 114 and 115 in the vertical direction. It is not limited to the position of the parts 116 and 117. Furthermore, although the height is narrowed by lowering the adjustment plates 121 and 122 with respect to the passage openings 116 and 117, the height may be narrowed by raising the adjustment plates 121 and 122.

DESCRIPTION OF SYMBOLS 11 Coal feeder 12 Fluidized bed dryer 13 Pulverized coal machine 14 Coal gasifier 15 Char recovery device 16 Gas refiner 17 Gas turbine equipment 18 Steam turbine equipment 19 Generator 20 Waste heat recovery boiler 101 Drying vessel 102 Raw coal input 103 Dry coal discharge port 104 Fluidized steam supply unit 105 Gas discharge port 106, 107, 108 Heat transfer tube (heating unit)
111 First drying chamber 112 Second drying chamber 113 Third drying chamber 114, 115 Partition plate 116, 117 Passing opening 121, 122 Adjustment plate (passage adjustment device)
123 Drive device 124 Screw shaft 125a, 125b, 125c Pressure sensor (passage failure detection device)
126 Control devices 131a and 131b Temperature sensors (passage failure detection devices)
141 Rotary valve (passage adjustment device)
142 Drive unit (adjustment unit)
F, F1, F2, F3 Free board part S, S1, S2, S3 Fluidized bed

Claims (7)

A drying container having a hollow shape capable of discharging wet fuel from the wet fuel charging portion on one end side and discharging dry matter obtained by heating and drying the wet fuel from the dry matter discharging portion on the other end side;
A fluidized steam or fluidized gas supply unit that forms a fluidized bed with wet fuel by supplying fluidized steam or fluidized gas to a portion of the drying vessel;
A heating unit for heating the wet fuel in the fluidized bed;
A partition plate that divides the fluidized bed into a plurality of wet fuel flow directions and forms a wet fuel passage opening;
A passage amount adjusting device capable of adjusting a passage amount of wet fuel passing through the passage opening;
A poor passage detection device for detecting poor passage of wet fuel in the passage opening;
A control device for increasing the amount of wet fuel passing by the passage amount adjusting device when the passage failure detecting device detects a defective passage of wet fuel;
A fluidized bed drying apparatus comprising:   The fluidized bed drying apparatus according to claim 1, wherein the passage amount adjustment device includes an adjustment plate capable of adjusting an opening area of the passage opening.   The defective passage detection device determines that the wet fuel has failed to pass when a pressure or temperature deviation in the vicinity of the passage opening in the fluidized bed becomes larger than a predetermined width. The fluidized bed drying apparatus according to 1 or 2.   4. The apparatus according to claim 1, wherein the passage failure detection device determines that the wet fuel does not pass when the height of the fluidized bed is higher than a predetermined height. The fluidized bed drying apparatus as described.   5. The passage failure detection device determines that the wet fuel does not pass when a deviation in height of the plurality of fluidized beds exceeds a predetermined deviation set in advance. The fluidized bed drying apparatus according to claim 1.   The fluidized bed drying apparatus according to any one of claims 1 to 5, wherein the passage amount adjusting device includes an adjusting device capable of adjusting a rotational speed of a rotary valve provided in the passage opening. . When the passage amount adjustment device increases the wet fuel passage amount and the wet fuel passage failure is not resolved, the control device reduces the wet fuel input amount reduction processing, the dry matter discharge amount increase processing, the fluidized steam. Alternatively, the fluidized bed drying apparatus according to any one of claims 1 to 6, wherein the fluidized gas supply amount increasing process or the heating temperature increasing process by the heating unit is performed.

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