JP2013170767A - Fluid bed drying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluid bed drying device capable of improving drying efficiency by suppressing fluidizing failure of wet fuel.SOLUTION: A fluid bed drying device includes a drying container 101 which contains a raw coal feeding opening 102 and a dried coal discharging opening 103, a fluidizing steam supply part 104 which forms a fluid bed S along with raw coal by supplying fluidizing steam to the lower part of the drying container 101, a heat transfer pipe 106 for heating the raw coal of the fluid bed S, partitions 114 and 115 for dividing the fluid bed S (S1, S2, and S3) in three along flow direction of the raw coal while forming passing openings 116 and 117 for the raw coal at the lower part, and a turning flow generation device for generating turning flows T1, T2, and T3 at respective fluid beds S1, S2, and S3.

Description

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

  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. In the fluidized bed dryer described in Patent Document 1, a wet raw material is charged from a charging chute, high-temperature gas is blown from the lower side of the gas dispersion plate as a heat source and fluidizing gas, and the fluidized bed is placed on the gas dispersion plate. Is a fluidized bed dryer that dries the wet raw material, and the flow rate of the heat source / fluidizing gas blown from the lower side of the gas dispersion plate immediately below the charging chute is changed to a gas dispersion other than the lower portion of the charging chute. It is faster than the flow rate of the heat source / fluidizing gas blown from the lower side of the plate.

JP 2011-0669609 A

  In the conventional fluidized bed dryer described above, the high-temperature gas is introduced into the wind box, passes through the gas dispersion plate provided on the upper part thereof, and is supplied to the drying chamber. In this case, although the flow rate of the hot gas directly below the charging chute is increased, the entire dryer only supplies the hot gas to the fluidized bed through the gas dispersion plate, and fluidizes the raw coal. In addition, the flow of the plug flow may be insufficient, and the raw coal may not be efficiently dried.

  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 drying efficiency by suppressing poor fluidization of wet fuel.

  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, a fluidized steam supply unit that forms a plurality of fluidized beds together with wet fuel by supplying fluidized steam to the dry container, and a wet fuel for each fluidized bed A heating unit for heating, and a swirl flow generating device that generates a swirl flow having an axis that is orthogonal to the flow direction and that extends in the horizontal direction in each of the fluidized beds.

  Therefore, since the swirl flow generator generates a swirl flow having an axial center along the horizontal direction orthogonal to the flow direction in each fluidized bed, the wet fuel introduced from the wet fuel charging unit swirls with the fluidized steam. However, it moves between each fluidized layer and dries, and the drying efficiency can be improved by suppressing the fluidization failure of the wet fuel in the drying container.

  In the fluidized bed drying apparatus of the present invention, the plurality of fluidized beds are formed by dividing the inside of the drying container into a plurality of wet fuel flow directions and a partition plate that forms a wet fuel passage opening. It is characterized by that.

  Therefore, the wet fuel is swirled by the fluidized steam in each fluidized bed divided by the partition plate, and is sequentially dried by moving between the fluidized layers. Therefore, it is possible to prevent the wet fuel from being dried.

  In the fluidized bed drying apparatus of the present invention, the passage opening is provided below the partition plate or above the partition plate.

  Therefore, when the passage opening is at the lower part of the partition plate, the wet fuel swirled by the fluidized steam moves to the next fluidized bed through the passage opening, and the passage opening is above the partition plate. In this case, the wet fuel swirled by the fluidized steam overflows the partition plate and moves to the next fluidized bed, so that the retention of the wet fuel is suppressed, and poor wet fuel passage at the passage opening can be prevented. .

  In the fluidized bed drying apparatus of the present invention, the fluidized steam supply unit supplies fluidized steam into the drying container from below the fluidized bed through a dispersion plate, and the swirling flow generating device A swirling flow is generated by making the fluidized steam supply speed or the fluidized steam supply amount from the fluidized steam supply unit different between the upstream side and the downstream side of the bed.

  Therefore, the swirl flow can be easily generated by making the fluidized steam supply speed or fluidized steam supply amount different between the upstream side and the downstream side of the fluidized bed.

  In the fluidized bed drying apparatus of the present invention, an upstream wind box corresponding to the upstream side of the fluidized bed and a downstream wind box corresponding to the downstream side of the fluidized bed are provided below the dispersion plate, The amount of fluidized steam supplied from the fluidized steam supply unit to the upstream side wind box and the downstream side wind box is made different.

  Therefore, it is possible to appropriately generate a swirl flow by dividing the wind boxes and changing the amount of fluidized steam to each wind box.

  The fluidized bed drying apparatus of the present invention is characterized in that the opening area of the upstream side corresponding to the upstream side of the fluidized bed and the downstream side opening corresponding to the downstream side of the dispersion plate are made different.

  Therefore, it is only necessary to make the sizes of the upstream side opening and the downstream side opening of the fluidized bed different, and an increase in manufacturing cost can be suppressed.

  The fluidized bed drying apparatus of the present invention is characterized in that the swirl flow generated by the swirl flow generator is a downward flow in the vertical direction at a charging position of the wet fuel charged from the wet fuel charging unit.

  Therefore, the wet fuel input from the wet fuel input unit can be appropriately entangled in the swirl flow by the swirl flow generator and can be satisfactorily dried.

  According to the fluidized bed drying apparatus of the present invention, a swirl flow generating device that generates a swirl flow that has a plurality of fluidized beds orthogonal to the flow direction and having an axis along the horizontal direction is provided. The wet fuel is dried by moving between the fluidized layers while swirling with the fluidized steam, and the drying efficiency can be improved by suppressing the fluidization failure of the wet fuel in the drying container.

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 configuration diagram illustrating the flow of fluidized steam in the fluidized bed drying apparatus of the first embodiment. FIG. 4 is a schematic diagram showing the fluidized state of the fluidized bed in the fluidized bed drying apparatus of Example 1. FIG. 5 is a schematic diagram showing the configuration of the first drying chamber in the fluidized bed drying apparatus of Example 1. FIG. 6 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. 7 is a schematic diagram illustrating a fluidized state in the fluidized bed drying apparatus according to the second embodiment of the present invention. FIG. 8 is a schematic diagram showing a fluidized state in a fluidized bed drying apparatus according to Example 3 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. 4 is a schematic configuration diagram showing the flow of fluidized steam in the drying device, FIG. 4 is a schematic diagram showing the fluidized state of the fluidized bed in the fluidized bed drying device of Example 1, and FIG. 5 is in the fluidized bed drying device of Example 1. FIG. 6 is a schematic diagram illustrating a configuration of the first drying chamber, and FIG. 6 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.

  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 coal gasification combined power generation facility of Example 1 is an air combustion type (air blowing) power generation facility. In this case, low-grade coal is used as the wet fuel supplied to the gasifier.

  In Example 1, as shown in FIG. 6, 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, and a fluidized steam supply. The unit 104 (104a, 104b, 104c), the gas discharge port 105, and the heat transfer tubes 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. 5). 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 vessel 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, so that the dispersion plate 109 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. And each partition plate 114,115 is located so that a lower end part may be located in the dispersion plate 109 with a predetermined clearance, and an upper end part may be extended upwards from the fluidized bed S. FIG. That is, passage openings 116 and 117 having a predetermined height and width (opening area) are secured between the partition plates 114 and 115 and the dispersion plate 109, and the passage openings 116 and 117 are substantially The same opening area is set.

  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 (preheat drying region) in which the freeboard portion F1 and the fluidized bed S1 are formed and the initial drying of the raw coal is performed. In the second drying chamber 112, a free board portion F2 and a fluidized bed S2 are formed, and the second drying chamber 112 is an area (fixed rate drying area) where the raw coal is dried in the middle period. In the third drying chamber 113, a free board portion F3 and a fluidized bed S3 are formed, and the third drying chamber 113 is a region where the latter drying of raw coal is performed (decrease rate drying region).

  In this case, each of the drying chambers 111, 112, and 113 is set so that the floor area is substantially the same, but may be set to an optimum ratio according to the moisture content of raw coal, for example, 2 It is desirable to set the floor area of the drying chamber 112 to the maximum. That is, the first drying chamber 111 is a preheat drying region in which the drying rate of the raw coal is increased to a predetermined moisture content because the moisture content of the raw coal to be charged is high. Since the drying rate of the raw coal rises to a predetermined drying rate and becomes constant, the second drying chamber 112 is a constant rate drying region where the drying rate of the raw coal becomes constant. Since the drying rate of the raw coal is processed when the moisture content of the raw coal reaches a predetermined moisture content (limit moisture content), the third drying chamber 113 is a reduced rate drying region in which the drying rate of the raw coal decreases. is there. Therefore, the drying efficiency is improved by maximizing the volume of the second drying chamber 112 that is the constant rate drying region.

  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 formed by fluidized steam (superheated steam) flowing inside. Can be dried by heating. 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.

  Further, as shown in FIG. 3, the fluidized bed drying apparatus 12 is provided with a first steam supply line 121 for supplying fluidized steam (superheated steam) to each of the drying chambers 111, 112, and 113. Three branch lines 121a, 121b, 121c branched from the first steam supply line 121 are connected to the wind boxes 110a, 110b, 110c, respectively. In addition, the fluidized bed drying apparatus 12 is provided with a second steam supply line 122 that supplies superheated steam to the heat transfer tubes 106, 107, and 108 in the drying chambers 111, 112, and 113. Branch lines 122a, 122b, 122c branched from 122 are connected to one end portions (inlet portions) of the respective heat transfer tubes 106, 107, 108.

  In the fluidized bed drying device 12, a gas discharge line 123 is connected to the gas discharge port 105, and a dust removing device 124 is attached to the gas discharge line 123. The gas discharge line 123 is connected to the base end portion of the first steam supply line 121, the base end portion of the second steam supply line 122, and the surplus gas line 126 via the branch portion 125. The first steam supply line 121 is equipped with a heater 127 and a flow rate adjustment valve 128, and the second steam supply line 122 is equipped with a booster 129 and a flow rate adjustment valve 130.

  In addition, drain pipes 131a, 131b, and 131c are connected to the other end portions (outlet portions) of the heat transfer tubes 106, 107, and 108, respectively.

  Accordingly, fluidized steam (superheated steam) is supplied from the first steam supply line 121 to the wind boxes 110a, 110b, and 110c through the branch lines 121a, 121b, and 121c, and from the wind boxes 110a, 110b, and 110c to the drying chambers. 111, 112, 113. The fluidized steam supplied to the drying chambers 111, 112, 113 and the steam generated by drying the raw coal are discharged from the gas discharge port 105 to the gas discharge line 123 and are removed by the dust removing device 124. Thereafter, a part is heated by the heater 127 in the first steam supply line 121, and a part is boosted by the booster 129 in the second steam supply line 122.

  Thereafter, the fluidized steam heated by the heater 127 in the first steam supply line 121 is again supplied from the branch lines 121a, 121b, and 121c to the drying chambers 111, 112, and 113 through the wind boxes 110a, 110b, and 110c. To be supplied. The fluidized steam boosted by the booster 129 in the second steam supply line 122 is supplied as superheated steam from the second steam supply line 122 to the heat transfer tubes 106, 107, and 108 through the branch lines 122a, 122b, and 122c. Then, after the raw coal in each of the drying chambers 111, 112, and 113 is heated, it becomes condensed water and is discharged to the drain pipes 131a, 131b, and 131c.

  In this embodiment, as shown in FIG. 4, in each fluidized bed S <b> 1, S <b> 2, S <b> 3, the axis is perpendicular to the flow direction of the raw coal and extends along the horizontal direction, that is, in the width direction of the drying container 101. A swirl flow generating device is provided for generating swirl flows T1, T2, T3 having axial axes along.

  This swirl flow generating device varies the fluidized steam supply speeds or fluidized steam supply amounts from the fluidized steam supply units 104a, 104b, 104c on the upstream side and the downstream side of the fluidized beds S1, S2, S3. The swirl flows T1, T2, and T3 are generated. Specifically, the swirling flow generating device has a higher fluidized steam supply rate from the fluidized steam supply units 104a, 104b, 104c on the downstream side than the upstream sides of the fluidized beds S1, S2, S3, or By increasing the fluidized steam supply amount, the swirl flows (swirl flows) T1, T2, and T3 in the counterclockwise direction in FIG. 4 are generated.

  That is, in the first drying chamber 111, as shown in FIG. 5, the wind box 110a is divided into an upstream wind box 141a and a downstream wind box 141b by a partition member 140, and the lower part of each wind box 141a, 141b. Are provided with divided supply parts 142a and 142b as fluidized steam supply parts 104a, respectively. And each supply line 143a, 143b branched into two from the branch line 121a is connected to each division | segmentation supply part 142a, 142b, and the flow regulating valve 144a, 144b is mounted | worn. Then, by increasing the opening degree of the flow rate adjustment valve 144b relative to the opening degree of the flow rate adjustment valve 144a, the fluidized steam amount supplied from the supply line 143a to the upstream wind box 141a is downstream from the supply line 143b. The amount of fluidized steam supplied to the side wind box 141b is increased. Therefore, the supply speed (supply amount) of fluidized steam supplied from the downstream wind box 141b to the fluidized bed S1 from the supply speed (supply amount) Va of fluidized steam supplied from the upstream windbox 141a to the fluidized bed S1. ) Vb becomes higher, and as a result, as shown in FIG. 4, a swirling flow (swirling flow) T1 in the counterclockwise direction can be generated. In this case, the fluidized vapor passage openings formed in the dispersion plate 109 all have the same opening area.

  Although only the fluidized bed S1 has been described here, the other fluidized beds S2 and S3 have the same configuration.

  Further, in the above description, the upstream wind box 141a and the downstream wind box 141b are provided as a configuration for generating counterclockwise swirl flows (swirl flows) T1, T2, T3 in the fluidized beds S1, S2, S3. The amount of fluidized steam supplied to the upstream side wind box 141a and the amount of fluidized steam supplied to the downstream side wind box 141b are made different by changing the opening degree of each flow regulating valve 144a, 144b. The configuration is not limited. That is, in the first drying chamber 111, by increasing the upstream opening corresponding to the upstream side of the fluidized bed S1 in the dispersion plate 109 and reducing the opening area of the downstream opening corresponding to the downstream side, the fluidized bed S1. The supply speed Vb of the fluidized steam supplied from the downstream wind box 141b to the fluidized bed S1 is made higher than the supply speed Va of the fluidized steam supplied to the counterclockwise direction, and the swirling flow (swirl flow) T1 in the counterclockwise direction is increased. You may make it produce | generate.

  In the present embodiment, in the fluidized bed S1, the swirling flow (swirling flow) T1 in the counterclockwise direction becomes a downward flow in the vertical direction at the charging position of the raw coal charged from the raw coal charging port 102. Yes. Therefore, the raw coal input from the raw coal input 102 is drawn downward by the swirl flow T1 and is appropriately mixed with the surrounding raw coal. That is, since the raw coal charging direction from the raw coal charging port 102 and the direction of the swirl flow T1 are the same direction, the undried raw coal and the raw coal in the initial stage of drying are appropriately mixed and drying is promoted. The

  Further, the drying container 101 is divided into three fluidized beds S1, S2, and S3 by the partition plates 114 and 115, and the fluidized beds S1, S2, and S3 are passed through openings 116 and 117 below the partition plates 114 and 115, respectively. Therefore, the raw coal swirling in the swirling flow T1 can appropriately move to the next fluidized beds S2 and S3 through the passage openings 116 and 117.

  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.

  At this time, for example, in the first drying chamber, as shown in FIG. 5, from the downstream wind box 141b, the supply speed (supply amount) Va of the fluidized steam supplied from the upstream wind box 141a to the fluidized bed S1. Since the supply speed (supply amount) Vb of the fluidized steam supplied to the fluidized bed S1 is higher, as shown in FIGS. 4 and 5, the counterclockwise rotation of the raw coal in each fluidized bed S1, S2, S3. A directional swirl flow (swirl flow) T1 is generated. Therefore, the raw coal is properly mixed and drying is promoted, and the retention of the raw coal is prevented.

  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.

  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 tube 106 that heats the raw coal of the fluidized bed S, and the fluidized bed S (S1, S2, S3) are divided into three in the flow direction of the raw coal. In addition, there are provided partition plates 114 and 115 for forming raw coal passage openings 116 and 117 in the lower part, and a swirl flow generator for generating swirl flows T1, T2 and T3 in each of the fluidized beds S1, S2 and S3. .

  Accordingly, since the swirl flows T1, T2, and T3 are generated in the fluidized beds S1, S2, and S3, the raw coal introduced from the raw coal charging port 102 is swirled by the fluidized steam while the fluidized beds S1, S2, and S3 are swirled. Drying is performed by moving between S2 and S3, and by suppressing poor fluidization of raw coal in the drying vessel 101, drying efficiency can be improved.

  Further, in the fluidized bed drying apparatus of Example 1, the inside of the drying container 101 is divided into three fluidized beds S1, S2, S3 in the flow direction of the raw coal by the partition plates 114, 115, and the passage opening 116, 117 is formed. Therefore, the raw coal is swirled by the fluidized steam in each fluidized bed S1, S2, S3 divided by the partition plates 114, 115, and is sequentially moved between the fluidized beds S1, S2, S3. Thus, the poorly dried raw coal is suppressed from moving to the next fluidized beds S2 and S3, and the dryness of the raw coal can be suppressed.

  In this case, the passage openings 116 and 117 of the partition plates 114 and 115 are provided in the lower part, and the raw coal swirled by the fluidized steam passes through the passage openings 116 and 117 to the next fluidized beds S2 and S3. It will move, the retention of raw coal is suppressed, and the poor passage of raw coal in the passage openings 116 and 117 can be prevented.

  Moreover, in the fluidized bed drying apparatus of Example 1, the swirl flow is generated by making the fluidized steam supply rate or the fluidized steam supply amount different between the upstream side and the downstream side of the fluidized beds S1, S2, and S3. Since the fluidized steam supply speed or the fluidized steam supply amount is different between the upstream side and the downstream side of the fluidized beds S1, S2, and S3, the raw coal easily generates swirl flows T1, T2, and T3 while flowing. be able to.

  Further, in the fluidized bed drying apparatus of Example 1, an upstream wind box 141a corresponding to the upstream side of the fluidized beds S1, S2, and S3 and a downstream wind box 141b corresponding to the downstream side are provided below the dispersion plate 109, The amount of fluidized steam supplied from the divided supply units 142a and 142b to the upstream wind box 141a and the downstream wind box 141b is made different. Therefore, the swirl flows T1, T2, and T3 can be appropriately generated by dividing the two wind boxes 141a and 141b into different amounts of fluidized steam to the wind boxes 141a and 141b.

  Further, in the fluidized bed drying apparatus of Example 1, the opening areas of the upstream side corresponding to the upstream side of the fluidized beds S1, S2, and S3 in the dispersion plate 109 and the downstream side opening corresponding to the downstream side are made different. . Accordingly, the flow velocity of the fluidized steam is different between the upstream side opening and the downstream side opening of the fluidized beds S1, S2, S3, and the swirl flow T1, T2, T3 can be easily generated with a simple configuration. An increase in cost can be suppressed.

  In the fluidized bed drying apparatus of Example 1, the swirl flows T1, T2, and T3 in the fluidized beds S1, S2, and S3 are downward in the vertical direction at the input position of the raw coal input from the raw coal input port 102. It has become a flow. Therefore, the undried raw coal input from the raw coal input 102 is properly caught in the raw coal in the course of drying that is being swirled by the swirl flows T1, T2, and T3. It can be carried out.

  FIG. 7 is a schematic diagram showing a fluidized state of a fluidized bed in a fluidized bed drying apparatus according to Example 2 of the present invention. In addition, the same code | symbol is attached | subjected to the member which has the same function as Example 1 mentioned above, and detailed description is abbreviate | omitted.

  In Example 2, as shown in FIG. 7, the fluidized bed drying apparatus 150 is a plug flow type drying apparatus, and includes a drying container 101, a raw coal charging port 102, a dry coal discharging port 103, and a fluidization. The vaporized steam supply unit 104 (104a, 104b, 104c), the gas discharge port 105, and the heat transfer tubes 106, 107, 108 (see FIG. 1) are provided.

  In the drying container 101, the fluidized bed S is divided into three pieces (fluidized beds S 1, S 2, S 3) in the flow direction of the raw coal by the two partition plates 151, 152, and the raw coal is placed above the partition plates 151, 152. A passage opening is formed. That is, the raw coal overflows above the partition plates 151 and 152 and can move between the fluidized beds S1, S2 and S3.

  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 151 and 152. The drying chambers 111, 112, and 113 are In addition, communication is made above the partition plates 151 and 152. In this case, the fluidized bed S1 is formed in the first drying chamber 111, the fluidized bed S2 is formed in the second drying chamber 112, and the fluidized bed S3 is formed in the third drying chamber 113.

  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 drying container 101 is configured as a plug flow system so that the supplied raw coal is pushed out in the room.

  In this embodiment, in each of the fluidized beds S1, S2, and S3, a swivel having an axis that is orthogonal to the flow direction of the raw coal and that extends along the horizontal direction, that is, an axis that extends along the width direction of the drying vessel 101. A swirl flow generator for generating the flows T1, T2, T3 is provided.

  This swirl flow generating device varies the fluidized steam supply speeds or fluidized steam supply amounts from the fluidized steam supply units 104a, 104b, 104c on the upstream side and the downstream side of the fluidized beds S1, S2, S3. The swirl flows T1, T2, and T3 are generated. Specifically, the swirling flow generating device has a higher fluidized steam supply rate from the fluidized steam supply units 104a, 104b, 104c on the downstream side than the upstream sides of the fluidized beds S1, S2, S3, or By increasing the fluidized steam supply amount, the swirl flows (swirl flows) T1, T2, and T3 in the counterclockwise direction in FIG. 7 are generated.

  Accordingly, in each fluidized bed S1, S2, S3, each fluidized steam supply section 104a, 104b, 104c has a higher fluidized steam supply speed on the upstream side or a fluidized steam supply. Since the amount is large, swirl flows (swirl flows) T1, T2, and T3 in the counterclockwise direction are generated in FIG. Therefore, the raw coal is properly mixed and drying is promoted, and the retention of the raw coal is prevented. And between each fluidized bed S1, S2, S3, the swirling raw coal will overflow and move above each partition plate 151, 152, and only the raw coal whose degree of drying has progressed will be the next fluidized bed S2, S2. It is possible to move to S3.

  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.

  As described above, in the fluidized bed drying apparatus of Example 2, the raw coal is obtained by supplying fluidized steam to the drying container 101 having the raw coal inlet 102 and the dry coal outlet 103 and the lower portion of the drying container 101. The fluidized steam supply unit 104 that forms the fluidized bed S, the heat transfer tube 106 that heats the raw coal of the fluidized bed S, and the fluidized bed S (S1, S2, S3) are divided into three in the flow direction of the raw coal. In addition, there are provided partition plates 151 and 152 for forming raw coal passage openings at the top, and swirl flow generating devices for generating swirl flows T1, T2 and T3 in the fluidized beds S1, S2 and S3.

  Accordingly, since the swirl flows T1, T2, and T3 are generated in the fluidized beds S1, S2, and S3, the raw coal introduced from the raw coal charging port 102 is swirled by the fluidized steam while the fluidized beds S1, S2, and S3 are swirled. Drying is performed by moving between S2 and S3, and by suppressing poor fluidization of raw coal in the drying vessel 101, drying efficiency can be improved.

  Moreover, in the fluidized bed drying apparatus of Example 2, the raw coal moves by overflowing above the partition plates 151 and 152. Therefore, the retention of raw coal can be suppressed and flow failure of the raw coal can be prevented.

  FIG. 8 is a schematic diagram showing the fluidized state of the fluidized bed in the 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 same function as Example 1 mentioned above, and detailed description is abbreviate | omitted.

  In Example 3, as shown in FIG. 8, the fluidized bed drying device 160 is a plug flow type drying device, and includes a drying container 101, a raw coal inlet 102, a dry coal outlet 103, and a fluidization. The vaporized steam supply unit 104 (104a, 104b, 104c), the gas discharge port 105, and the heat transfer tubes 106, 107, 108 (see FIG. 1) are provided.

  In the drying container 101, the fluidized bed S is divided into three (fluidized beds S 1, S 2, S 3) in the flow direction of the raw coal by two partition plates 114, 115, and the raw coal is below each partition plate 114, 115. Passing openings 116 and 117 are formed. That is, the raw coal can move between the fluidized beds S1, S2, and S3 through the passage openings 116 and 117 formed below the partition plates 114 and 115, respectively.

  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 fluidized bed S1 is formed in the first drying chamber 111, the fluidized bed S2 is formed in the second drying chamber 112, and the fluidized bed S3 is formed in the third drying chamber 113.

  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 drying container 101 is configured as a plug flow system so that the supplied raw coal is pushed out in the room.

  In this embodiment, in each of the fluidized beds S1, S2, and S3, a swivel having an axis that is orthogonal to the flow direction of the raw coal and that extends along the horizontal direction, that is, an axis that extends along the width direction of the drying vessel 101. A swirl flow generator for generating the flows T1, T2, T3 is provided.

  This swirl flow generating device varies the fluidized steam supply speeds or fluidized steam supply amounts from the fluidized steam supply units 104a, 104b, 104c on the upstream side and the downstream side of the fluidized beds S1, S2, S3. The swirl flows T1, T2, and T3 are generated. Specifically, the swirl flow generating device has a higher fluidized steam supply rate from the fluidized steam supply units 104a, 104b, 104c on the upstream side than the downstream sides of the fluidized beds S1, S2, S3, or By increasing the fluidized steam supply amount, the swirl flows (swirl flows) T1, T2, T3 in the clockwise direction in FIG. 8 are generated.

  Accordingly, in each fluidized bed S1, S2, S3, each fluidized steam supply unit 104a, 104b, 104c has a higher fluidized steam supply speed on the downstream side or a fluidized steam supply. Since the amount is large, the swirl flows (swirl flows) T1, T2, and T3 in the clockwise direction are generated in FIG. Therefore, the raw coal is properly mixed and drying is promoted, and the retention of the raw coal is prevented. And between each fluidized bed S1, S2, S3, the turning raw coal moves through each passing opening 116, 117 of each partition plate 114, 115, and the raw coal whose degree of drying has progressed appropriately is the next. It can move to fluidized beds S2 and S3.

  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.

  As described above, in the fluidized bed drying apparatus of Example 3, the raw coal is obtained by supplying fluidized steam to the drying container 101 having the raw coal inlet 102 and the dry coal outlet 103 and the lower portion of the drying container 101. The fluidized steam supply unit 104 that forms the fluidized bed S, the heat transfer tube 106 that heats the raw coal of the fluidized bed S, and the fluidized bed S (S1, S2, S3) are divided into three in the flow direction of the raw coal. In addition, partition plates 114 and 115 that form raw coal passage openings 116 and 117 and a swirl flow generator that generates swirl flows T1, T2, and T3 in the fluidized beds S1, S2, and S3 are provided. .

  Accordingly, since the swirl flows T1, T2, and T3 are generated in the fluidized beds S1, S2, and S3, the raw coal introduced from the raw coal charging port 102 is swirled by the fluidized steam while the fluidized beds S1, S2, and S3 are swirled. Drying is performed by moving between S2 and S3, and by suppressing poor fluidization of raw coal in the drying vessel 101, drying efficiency 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.

  In the above-described embodiments, low-grade coal is used as the wet fuel, but even high-grade coal can be applied, and is not limited to coal, and can be used as a renewable organic organic resource. For example, it is also possible to use thinned wood, waste wood, driftwood, grass, waste, sludge, tires, and recycled fuel (pellets or chips) using these as raw materials.

DESCRIPTION OF SYMBOLS 11 Coal feeder 12,150,160 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 charging port 103 Dry coal discharging port 104 Fluidized steam supply section 105 Gas discharging port 106, 107, 108 Heat transfer tube 110, 110a, 110b, 110c Wind box 111 First drying chamber 112 Second drying chamber 113 Third drying chamber 114, 115, 151, 152 Partition plate 116, 117 Passing opening 121 First steam supply line 121a, 121b, 121c Branch line 141a Upstream wind box 141b Downstream wind box 142a, 142b Divided supply section 143a, 143b Supply line 144a 144b Flow control valve (swirl flow Generating device)
F, F1, F2, F3 Free board part S, S1, S2, S3 Fluidized bed T1, T2, T3 Swirl flow

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 supply unit that forms fluidized beds with wet fuel by supplying fluidized steam to the drying vessel;
A heating section for heating the wet fuel of each fluidized bed;
A swirling flow generating device that generates a swirling flow having an axis that is orthogonal to the flow direction and that extends in the horizontal direction in each fluidized bed;
A fluidized bed drying apparatus comprising:   2. The plurality of fluidized beds are formed by dividing the inside of the drying container into a plurality of wet fuel flow directions and a partition plate that forms a wet fuel passage opening. The fluidized bed drying apparatus described in 1.   The fluidized bed drying apparatus according to claim 2, wherein the passage opening is provided below the partition plate or above the partition plate.   The fluidized steam supply unit supplies fluidized steam from below the fluidized bed to the drying vessel through a dispersion plate, and the swirl flow generator is configured to provide the upstream and downstream sides of the fluidized bed. The fluidized bed drying apparatus according to any one of claims 1 to 3, wherein the swirl flow is generated by changing a fluidized steam supply speed or a fluidized steam supply amount from the fluidized steam supply unit. .   An upstream wind box corresponding to the upstream side of the fluidized bed and a downstream wind box corresponding to the downstream side of the fluidized bed are provided below the dispersion plate, and the swirl flow generator is connected to the upstream side from the fluidized steam supply unit. The fluidized bed drying apparatus according to claim 4, wherein the amount of fluidized steam supplied to the wind box and the downstream wind box is made different.   5. The fluidized bed drying apparatus according to claim 4, wherein an opening area of an upstream opening corresponding to an upstream side of the fluidized bed and a downstream opening corresponding to a downstream side of the dispersion plate are made different from each other.   The swirl flow generated by the swirl flow generation device is a downward flow in the vertical direction at a wet fuel charging position that is input from the wet fuel charging unit. The fluidized bed drying apparatus described in 1.

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