JP2012241989A - Fluidized bed drying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the drying efficiency of a fluidized bed drying device.SOLUTION: The fluidized bed drying device is provided with a drying container 101 in a hollow shape; a coal feed opening 102 for feeding raw coal to one end side of the drying container 101; a dry coal discharge opening 103 for discharging dry coal obtained by heating and drying the raw coal from the other end side of the drying container 101; a fluidized gas supply part 104 which supplies fluidized gas to a lower part of the drying container 101 to form a fluidized bed S with the raw coal; a gas discharge opening 105 which discharges fluidized gas and generated steam from above the raw coal feed opening 102 on the one end side of the drying container 101; heat transfer tubes 106, 107 which heat the raw coal of the fluidized bed S; and a raw coal removal device 123 which removes the excessive raw coal of the fluidized bed S.

Description

  The present invention relates to a fluidized bed drying apparatus for drying a material to be dried by 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 fluidized drying method and fluidized bed drying apparatus described in Patent Document 1 supply a raw material containing moisture from a raw material supply port to a supply chamber, and the fluidized gas flows through a dispersion plate in the supply chamber and the drying classification chamber. When the animal is fluidized and dried and classified into fine powder and coarse particles, the layer thickness of the fluidized bed in the supply chamber is controlled separately from the layer thickness of the fluidized bed in the dry classification chamber.

JP 2008-128524 A

  As described above, low-grade coal has a higher water content than high-grade coal, and thus fluidization failure occurs in the drying apparatus, which may cause coal drying failure. In particular, in the region close to the inlet portion, the water concentration is high and the dispersibility of the particles is not good. This may cause fluidization failure, adhesion, and accumulation near the heat transfer tube and at the bottom surface, resulting in blockage. . Therefore, it is necessary to reduce the amount of coal to be input, and there is a problem that the processing amount decreases. The fluidized drying method and fluidized bed drying apparatus described in Patent Document 1 described above are materials having a high water content by controlling the layer thickness of the fluidized bed in the supply chamber separately from the layer thickness of the fluidized bed in the drying classification chamber. Are stably dried and classified while suppressing the agglomeration of the raw material particles and the occurrence of adhesion to the apparatus. However, this technique has a problem that the moisture evaporation load per unit volume of the fluidized bed in the supply chamber is increased, and the amount of heat for properly drying the raw material is insufficient.

  The present invention solves the above-described problems, and an object thereof is to provide a fluidized bed drying apparatus capable of improving the drying efficiency.

  In order to achieve the above object, a fluidized bed drying apparatus of the present invention includes a drying container having a hollow shape, a wet fuel charging unit for charging wet fuel to one end side of the drying container, and the other end side of the drying container. A dry matter discharge unit that discharges a dry matter obtained by heating and drying the wet fuel, a fluidizing gas supply unit that forms a fluidized bed together with the wet fuel by supplying a fluidizing gas to a lower portion of the drying vessel, and the drying vessel A gas discharge unit that discharges fluidized gas and generated steam from above, a heating unit that heats the wet fuel in the fluidized bed, and a wet fuel removal device that removes excess wet fuel in the fluidized bed. It is characterized by.

  Therefore, when wet fuel is fed into the dry container from the wet fuel feed section and fluidized gas is supplied from the fluidized gas supply section to the lower part of the dry container, the wet fuel flows by the fluidized gas. A fluidized bed is formed, and the wet fuel in the fluidized bed is heated by the heating unit to be gradually dried to become a dried product, and the dried product is discharged to the outside from the dried product discharge unit. Steam generated by the drying of the wet fuel is discharged to the outside from the gas discharge unit. At this time, if the fluidization of the wet fuel is insufficient or excessive wet fuel is supplied to the fluidized bed, the wet fuel removal device can be operated to remove the excess wet fuel in the fluidized bed. It is possible to heat the wet fuel flowing in the fluidized bed by applying a sufficient amount of heat, suppressing poor fluidization of the wet fuel, adhesion to the surroundings and accumulation, and improving the drying efficiency of the wet fuel. can do.

  In the fluidized bed drying apparatus of the present invention, the fluidized bed has a first fluidized region set at a predetermined first superficial velocity and a second superficial velocity set higher than the first superficial velocity. The wet fuel removal device moves excess wet fuel in the first flow region to the second flow region.

  Therefore, if there is an excess of wet fuel in the first flow region, the wet fuel removal device moves the excess wet fuel in the first flow region to the second flow region having a higher superficial velocity. The wet fuel can be properly heated and dried in the second flow region.

  In the fluidized bed drying apparatus of the present invention, a temporary storage unit for temporarily storing wet fuel is provided on a side portion in the flow direction of the drying container, and the wet fuel removal device is configured to store excess wet fuel in the fluidized bed. It moves to the said temporary storage part, It is characterized by the above-mentioned.

  Therefore, if there is an excess of wet fuel in the fluidized bed, the wet fuel removal device moves the excess wet fuel in the fluidized bed to the temporary storage part, so that the fluidization of the wet fuel in the fluidized bed is poor. Adhesion and deposition can be suppressed.

  The fluidized bed drying apparatus of the present invention is characterized in that a wet fuel recirculation path for returning the wet fuel stored in the temporary storage unit to the wet fuel charging unit is provided.

  Therefore, the wet fuel stored in the temporary storage unit is returned to the wet fuel charging unit through the wet fuel recirculation path, and re-injected into the drying container, whereby the wet fuel can be efficiently heated and dried. .

  In the fluidized bed drying apparatus of the present invention, the wet fuel removing device includes a scraper capable of moving excess wet fuel at the top of the fluidized bed, and a scraper moving device capable of moving the scraper laterally in the flow direction. It is characterized by having.

  Therefore, by moving the scraper by the scraper moving device, the excess wet fuel at the top of the fluidized bed can be moved to the side of the fluidized bed, the fluidization of the wet fuel in the fluidized bed is poor, Adhesion and deposition can be suppressed.

  In the fluidized bed drying apparatus of the present invention, the heating unit is a heat transfer tube through which superheated steam flows, and the scraper moves wet fuel above the heat transfer tube to the side in the flow direction. Yes.

  Therefore, it is difficult to sufficiently heat the wet fuel above the heat transfer tube. Therefore, moving the excess wet fuel above the heat transfer tube by the scraper moves the wet fuel in the fluidized bed. It is possible to suppress poor fluidization, adhesion to the surroundings, and accumulation.

  The fluidized bed drying apparatus of the present invention is characterized in that a fluidized gas jetting device for jetting a fluidized gas from the surface of the fluidized bed to the inside as the scraper moves is provided.

  Therefore, the fluidizing gas ejection device can promote the fluidization of the wet fuel by ejecting the fluidizing gas from the surface of the fluidized bed to the inside as the scraper moves, and adheres to the heating unit or the like. Wet fuel can be removed.

  In the fluidized bed drying apparatus of the present invention, a scraper oscillating device capable of agitating the fluidized bed by oscillating the scraper is provided.

  Therefore, the fluidization of the wet fuel can be promoted by agitating the fluidized bed by agitating the scraper by the scraper agitating device.

  According to the fluidized bed drying apparatus of the present invention, since the wet fuel removing device that removes excess wet fuel in the fluidized bed is provided, excess wet fuel in the fluidized bed is removed by the wet fuel removing device, The wet fuel that flows in the fluidized bed can be heated by applying a sufficient amount of heat, and this wet fuel can be prevented from fluidization, adhering to the surroundings and depositing, and improving the drying efficiency of the wet fuel. Can do.

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 plan view illustrating the fluidized bed drying apparatus according to the first embodiment. FIG. 3 is a cross-sectional view illustrating a first drying chamber in the fluidized bed drying apparatus according to the first embodiment. 4 is a cross-sectional view illustrating a second drying chamber in the fluidized bed drying apparatus of Example 1. FIG. FIG. 5 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. 6 is a schematic plan view showing a fluidized bed drying apparatus according to Embodiment 2 of the present invention. FIG. 7 is a cross-sectional view illustrating a first drying chamber in the fluidized bed drying apparatus according to the second embodiment. FIG. 8 is a cross-sectional view illustrating a first drying chamber in a fluidized bed drying apparatus according to Embodiment 3 of the present invention. FIG. 9 is a schematic side view showing a fluidized bed drying apparatus according to Embodiment 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 plan view showing a fluidized bed drying apparatus of Example 1, and FIG. 3 is a fluidized bed of Example 1. 4 is a sectional view showing a second drying chamber in the fluidized bed drying apparatus of Example 1, and FIG. 5 is a fluidized bed drying apparatus of Example 1. FIG. It is a schematic block diagram of coal gasification combined cycle power generation equipment.

  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. 5, 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.

  As shown in FIGS. 1 to 4, the fluidized bed drying apparatus 12 includes a drying container 101, a raw coal charging port (wet fuel charging unit) 102, a dry coal discharging port (dry matter discharging unit) 103, and a fluidization A gas supply unit 104 (104a, 104b, 104c), a gas discharge port (gas discharge unit) 105, and heat transfer tubes (heating units) 106, 107 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 addition, the drying container 101 is provided with a dispersion plate 108 having a plurality of openings at a predetermined distance from the bottom plate 101a at the lower portion, thereby partitioning an air box 109 (109a, 109b). The drying container 101 is provided with a fluidized gas supply unit 104 that supplies fluidized gas (superheated steam) to the bottom plate 101a above the dispersion plate 108 via the wind box 109. Further, in the drying container 101, a gas discharge port 105 for discharging fluidized gas 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 supplied with fluidizing gas from the fluidizing gas supply unit 104 through the wind box 109 and the dispersion plate 108. A fluidized bed S having a predetermined thickness is formed above, and a free board portion F is formed above the fluidized bed S.

  And the drying container 101 is comprised by the 1st drying chamber 111 provided in the upstream of the flow direction of raw coal, and the 2nd drying chamber 112 provided in the downstream of the flow direction of raw coal, A partition plate 113 that partitions the first drying chamber 111 and the second drying chamber 112 is provided on the dispersion plate 108, and the first drying chamber 111 and the second drying chamber 112 communicate with each other above the partition plate 113. . In this case, the first drying chamber 111 is formed with a freeboard portion F1 and a fluidized bed S1, and is a complete mixing region for initial drying of raw coal, and the second drying chamber 112 is fluidized with the freeboard portion F2. A layer S2 is formed, which serves as an extrusion region (plug flow region) for late drying of raw coal. The first drying chamber 111 and the second drying chamber 112 have a floor area ratio of 30 to 50%: 70 to 50%, which is set to an optimum ratio according to the raw coal processing amount. When the amount of raw coal is large, the first drying chamber 111 is preferably widened, and the floor area ratio between the first drying chamber 111 and the second drying chamber 112 is 50%: 50%. Set to.

  In this case, the wind box 109 is partitioned into wind boxes 109a and 109b corresponding to the first drying chamber 111 and the second drying chamber 112, and fluidized gas supply units 104a and 104b are provided corresponding to the wind boxes 109a and 109b. It has been. And the amount of fluidization gas supplied to windbox 109a and 109b can be adjusted by adjusting the opening of a flow control valve which is not illustrated.

  That is, the first drying chamber 111 is configured such that the supplied raw coal is in a completely mixed flow in the chamber. This completely mixed flow is a flow mixed in the fluidized bed S1 formed in the first drying chamber 111 so that the moisture content (moisture content) in the raw coal becomes uniform. For this reason, in the first drying chamber 111, back-mixing occurs in the flow direction.

  Moreover, the 2nd drying chamber 112 is comprised so that the supplied raw coal may flow in the chamber. This extrusion flow is a flow in which the raw coal is pushed in the flow direction so that the raw coal does not diffuse in the flow direction in the fluidized bed S2 formed in the second drying chamber 112.

  In the first drying chamber 111, a plurality of support plates 121 along the vertical direction and along the flow direction of the raw coal are arranged at predetermined intervals in the horizontal direction orthogonal to the flow direction of the raw coal, and the wall surface of the drying vessel 101 Installed on. A plurality of heat transfer tubes 106 that pass through the drying container 101 from the outside and circulate in the fluidized bed S <b> 1 are supported by the support plates 121. The support plate 121 on which the heat transfer tube 106 is supported is positioned so as to be embedded in the fluidized bed S1, and can heat and dry the raw coal in the fluidized bed S1 with superheated steam flowing in the heat transfer tube 106. .

  In the first drying chamber 111, a raw coal removing device (wet fuel removing device) 123 for removing excess raw coal in the fluidized bed S1 of the first drying chamber 111 is provided. The raw coal removing device 123 is configured to flow a scraper 124 that can move excess raw coal at the top of the fluidized bed S1, a support rod 125 that supports the scraper 124, and the scraper 124 that flows through the support rod 125. And a driving device (scraper moving device) 126 that can move laterally in the direction.

  That is, the first drying chamber 111 has a drive rod 126 fixed to the side of the flow direction of the raw coal in the fluidized bed S1, that is, one side wall, and the support rod extends in a direction orthogonal to the flow direction inside. 125 is inserted and a scraper 124 is attached to the tip. In this case, the scraper 124 is disposed close to the wall surface provided with the raw coal charging port 102 in the first drying chamber 111, and is disposed on the free board portion F1 above the support plate 121 on which the heat transfer tube 106 is supported. Has been placed. Therefore, when the driving device 126 is operated, the raw coal deposited above the support plate 121 can be moved by moving the scraper 124 along the direction orthogonal to the flow direction via the support rod 125.

  In addition, the fluidized bed S1 of the first drying chamber 111 has four compartment plates S11, S12, S13, S14 in a direction orthogonal to the flow direction because the four support plates 121 are arranged in parallel along the flow direction. It is divided into S15. And the wind box 109 of the 1st drying chamber 111 is provided with the partition plate 127 corresponding to between the compartments S14 and S15, so that the wind box 109a corresponding to the compartments S11, S12, S13, and S14, An air box 109c corresponding to the compartment S15 is provided, and a fluidizing gas supply unit 104c is provided corresponding to the air box 109c. And the amount of fluidization gas supplied to windbox 109a and 109c can be adjusted by adjusting the opening of a flow control valve which is not illustrated.

  That is, the fluidized bed S1 of the first drying chamber 111 is provided with a first fluidized region composed of the compartments S11, S12, S13, and S14 and a second fluidized region composed of the compartment S15. The predetermined first superficial velocity is set, and the second flow region is set to a second superficial velocity that is faster than the first superficial velocity. In this case, the first superficial velocity is an optimum speed for heating and drying while flowing the raw coal in the fluidized bed S1, and the second superficial velocity is faster than that. And since the 2nd flow field which consists of compartment S15 is provided in the opposite side to raw coal removal device 123 (drive device 126), scraper 124 of raw coal removal device 123 is the 1st flow region (compartment). Excess raw coal accumulated in S11, S12, S13, and S14) is moved to the second flow region (compartment S15) to be removed.

  Therefore, when raw coal is introduced into the first drying chamber 111 in the drying container 101 from the raw coal introduction port 102, the raw coal flows in the fluidized bed S1 by the fluidizing gas and is heated by the heat transfer tube 106. To be dried. As a result, the raw coal forming the fluidized bed S1 of the first drying chamber 111 can be made into a completely mixed flow, and is dried so that the moisture content (moisture content) is uniform. In the first drying chamber 111, for example, raw coal having a moisture content of about 60% can be initially dried until the moisture content becomes about 30 to 40%.

  At this time, the raw coal introduced into the first drying chamber 111 from the raw coal inlet 102 becomes, for example, a large amount, and is above the support plates 121 in the first flow region (compartments S11, S12, S13, S14). When it becomes excessive and accumulates, the raw coal removing device 123 is operated and removed. That is, the drive device 126 advances the scraper 124 via the support rod 125, so that excess raw coal accumulated in the first flow region (compartments S11, S12, S13, S14) is accumulated in the second flow region (compartment S15). ) In this second fluidized zone, the superficial velocity is faster than in the first fluidized region, so that excess raw coal can flow while being heated and dried at an early stage, and excess raw coal accumulates in this second fluidized region. There is hardly anything.

  Further, in the second drying chamber 112, a plurality of partition plates 129 along the horizontal direction perpendicular to the flow direction of the raw coal and along the vertical direction are arranged at predetermined intervals in the flow direction of the raw coal. It is attached to the wall. A plurality of heat transfer tubes 107 that pass through the drying container 101 from the outside and circulate in the fluidized bed S <b> 2 are supported by the partition plates 129. Each partition plate 129 that supports the heat transfer tube 107 has a lower end portion that is separated from the upper surface of the dispersion plate 108 so that a predetermined gap (flow port) is secured, and the upper end portion extends upward from the fluidized bed S2. The raw coal of the fluidized bed S2 can be heated and dried by superheated steam flowing in the heat transfer tube 107.

  In this case, since the plurality of partition plates 129 are arranged at predetermined intervals in the flow direction of the raw coal, the second drying chamber 112, specifically, the fluidized bed S2 is divided into the plurality of compartments S21, The plurality of compartments S21, S22, S23, S24, and S25 are divided into S22, S23, S24, and S25, have substantially the same volume, and are formed side by side along the flow direction of the raw coal. . Therefore, the raw coal can move from the respective distribution ports through the compartments S21, S22, S23, S24, and S25 while being dried in the fluidized bed S2.

  Therefore, when raw coal that has been initially dried is supplied from the first drying chamber 111, the raw coal flows in the fluidized bed S2 by the fluidized gas, and the distribution port between each partition plate 129 and the dispersion plate 108. The compartments S21, S22, S23, S24, S25 are moved through. At this time, the raw coal is dried by being heated by the heat transfer tube 107.

  As a result, the raw coal forming the fluidized bed S2 of the second drying chamber 112 can be made into an extruded flow by sequentially moving the plurality of compartments S21, S22, S23, S24, and S25 from the upstream side. Dried without diffusing in the direction. Note that the second drying chamber 112 can dry the raw coal having a moisture content of about 30 to 40%, for example, until the moisture content becomes about 10%.

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

  In the fluidized bed drying apparatus 12, the raw coal is supplied from the raw coal inlet 102 to the drying container 101 and the fluidizing gas is supplied from the fluidizing gas supply unit 104 through the dispersion plate 108. A fluidized bed S having a predetermined thickness is formed above the dispersion plate 108. The raw coal moves through the fluidized bed S to the dry coal discharge port 103 side by the fluidizing gas, and is heated and dried by receiving heat from the heat transfer tubes 106 and 107 at this time.

  In this case, the raw coal is heated and dried by the heat from the heat transfer tubes 106 and 107 and the fluidized gas while moving from the raw coal inlet 102 to the dry coal outlet 103, but is input from the raw coal inlet 102. Immediately after being done, the raw coal has a high moisture concentration, and there is a risk that proper drying will be difficult. Therefore, in the fluidized bed S1 of the first drying chamber 111, that is, in the first fluidized region (the compartments S11, S12, S13, and S14), raw coal accumulates in the region above each support plate 121 and is excessively supplied. There is. At this time, the raw coal removing device 123 is operated and the scraper 124 is moved forward, so that excess raw coal in the first flow region is moved to the second flow region (compartment S15). Then, since the superficial velocity is higher in the second fluidized region than in the first fluidized region, excess raw coal can be fluidized while being heated and dried at an early stage. In the fluidized bed S1 of the first drying chamber 111, the raw coal becomes a completely mixed flow, and is dried so that the moisture content is almost uniform in the region of the first drying chamber 111.

  The raw coal that has been initially dried in the first drying chamber 111 flows over the partition plate 113 to the second drying chamber 112. In the second drying chamber 112, the raw coal flows in the fluidized bed S2 by the fluidized gas, and passes through the flow port between each partition plate 129 and the dispersion plate 108, and enters the compartments S21, S22, S23, S24, S25. Move in order. At this time, the raw coal is dried in the fluidized bed S2 without being diffused in the flow direction as an extruded flow while being heated by the heat transfer tube 107.

  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 gas. 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 drying container 101 having a hollow shape, the raw coal charging port 102 for charging raw coal into one end side of the drying container 101, and the other end of the drying container 101 are provided. A dry coal discharge port 103 for discharging dry coal heated and dried from the raw coal from the side, and a fluidized gas supply unit 104 for forming a fluidized bed S together with the raw coal by supplying a fluidizing gas to the lower part of the drying vessel 101; The gas discharge port 105 for discharging fluidized gas and generated steam from above the raw coal input port 102 on one end side of the drying vessel 101, the heat transfer tubes 106 and 107 for heating the raw coal in the fluidized bed S, and the fluidized bed S And a raw coal removing device 123 for removing excess raw coal.

  Accordingly, when the raw coal is introduced into the drying container 101 from the raw coal inlet 102 and the fluidizing gas is supplied from the lower part of the drying container 101 through the dispersion plate 108 from the fluidizing gas supply unit 104, the raw coal is supplied. When fluidized gas flows, a fluidized bed S is formed. When the raw coal of the fluidized bed S moves by fluidized gas, it is heated by the heat transfer tube 106 to be dried to become dry coal. Is discharged to the outside from the dry coal discharge port 103, while steam generated by drying the fluidized gas and raw coal is discharged to the outside from the gas discharge port 105. At this time, if the raw coal in the fluidized bed S1 is insufficiently fluidized or excessive raw coal is supplied, the raw coal removing device 123 is operated to remove the excess raw coal in the fluidized bed S1. The raw coal flowing in the fluidized bed S1 can be heated by applying a sufficient amount of heat to suppress the poor fluidization of the raw coal, adhesion and deposition to the surroundings, and fine powder The drying efficiency of can be improved.

  Moreover, in the fluidized bed drying apparatus of Example 1, the fluidized bed S1 of the first drying chamber 111 is set to a first fluidized region (compartments S11, S12, S13, S14) set at a predetermined first superficial velocity, The raw coal removing device 123 is divided into a second flow region (compartment S15) set to a second superficial velocity higher than the first superficial velocity, and the raw coal removing device 123 performs the second flow of excess raw coal in the first flow region. Move to the area. Accordingly, when excessive raw coal is generated in the first flow region, the raw coal removing device 123 moves the raw coal in the first flow region to the second flow region having a higher superficial velocity, and therefore excessive raw coal. The charcoal can be moved to the second flow region and properly dried by heating.

  Further, in the fluidized bed drying apparatus of Example 1, as the raw coal removing device 123, the scraper 124 that can move the excess raw coal on the upper part of the fluidized bed S1 and the scraper 124 in the flow direction via the support rod 125 are used. A driving device 126 that can move laterally is provided. Therefore, by moving the scraper 124 by the driving device 126, it is possible to move the excess raw coal at the top of the fluidized bed S1 to the side of the fluidized bed S1, and the fluidization of the raw coal in the fluidized bed S1 is poor. , Adhesion and deposition to the surroundings can be suppressed.

  Further, in the fluidized bed drying apparatus of the first embodiment, the heat transfer pipe 106 through which superheated steam flows is supported by the support plate 121, the compartments S11, S12, S13, S14, and S15 are partitioned by the support plate 121, and the scraper 124 is provided. The raw coal above each support plate 121 (each heat transfer tube 106) is moved. Accordingly, the raw coal above the heat transfer tube 106 is difficult to be heated because sufficient heat is not transmitted from the heat transfer tube 106, and therefore, the excess raw coal above the heat transfer tube 106 is moved by the scraper 124. By doing so, it is possible to suppress poor fluidization of raw coal in the fluidized bed S1, adhesion to the surroundings, and deposition.

  6 is a schematic plan view showing a fluidized bed drying apparatus according to a second embodiment of the present invention, and FIG. 7 is a cross-sectional view showing a first drying chamber in the fluidized bed drying apparatus according to the second embodiment. 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.6 and FIG.7, in the 1st drying chamber 111, the raw coal removal apparatus 123 which removes the excess raw coal in the fluidized bed S1 of the 1st drying chamber 111 is provided. . The raw coal removing device 123 includes a scraper 124 that can move excess raw coal at the upper part of the fluidized bed S1, a support rod 125 that supports the scraper 124, and the scraper 124 in the flow direction via the support rod 125. And a drive device 126 that can move laterally.

  The fluidized bed S1 of the first drying chamber 111 is divided into five compartments S11, S12, S13, S14, and S15 by a support plate 121 on which the heat transfer tube 106 is supported. And the temporary storage part 131 which stores raw coal temporarily is provided adjacent to the side part of the drying container 101, ie, the compartment S15, and this temporary storage part 131 is provided through the opening 132 of the upper end part. The first drying chamber 111 communicates with the first drying chamber 111. The opening 132 has substantially the same height as the support plate 121, and the excess raw coal in the fluidized bed S <b> 1 can be moved to the temporary storage unit 131 by the scraper 124 of the raw coal removing device 123. .

  Further, the temporary storage unit 131 is provided with a raw coal recirculation path 133 for returning the raw coal initially stored therein to the raw coal inlet 102, and a conveying device (such as a blower) 134 is provided in the raw coal recirculation path 133. Is provided. Therefore, by operating the transport device 134, the raw coal stored in the temporary storage unit 131 is returned from the raw coal recirculation path 133 to the raw coal inlet 102, and is introduced into the first drying chamber 111 together with new raw coal. Can do. In this case, when the raw coal in the temporary storage unit 131 is introduced from the raw coal recirculation path 133 into the first drying chamber 111 through the raw coal inlet 102, it is desirable to reduce the input amount of newly introduced raw coal. .

  Therefore, when raw coal is introduced into the first drying chamber 111 in the drying container 101 from the raw coal introduction port 102, the raw coal flows in the fluidized bed S1 by the fluidizing gas and is heated by the heat transfer tube 106. To be dried. As a result, the raw coal forming the fluidized bed S1 of the first drying chamber 111 can be made into a completely mixed flow, and is dried so that the moisture content (moisture content) is uniform.

  At this time, when the raw coal charged into the first drying chamber 111 from the raw coal charging port 102 is accumulated above the support plates 121 in the fluidized bed S1 and becomes excessive, the raw coal removing device 123 is activated. And remove. That is, the drive device 126 moves the scraper 124 forward via the support rod 125, thereby moving excess raw coal accumulated in the fluidized bed S <b> 1 to the temporary storage unit 131. And the raw coal stored in the temporary storage part 131 by the conveying apparatus 134 is returned to the raw coal inlet 102 from the raw coal recirculation path 133, and is supplied into the 1st drying chamber 111 with new raw coal.

  Thus, in the fluidized-bed drying apparatus of Example 2, while providing the raw coal removal apparatus 123 which removes the excess raw coal in the fluidized bed S1, the raw coal is temporarily placed on the side in the flow direction in the drying vessel 101. The temporary storage part 131 which stores automatically is provided, and the raw coal removal apparatus 123 moves the excess raw coal in the fluidized bed S1 to this temporary storage part 131.

  Therefore, if there is an excess raw coal in the fluidized bed S1, the raw coal removal device 123 moves the excess raw coal in the fluidized bed S1 to the temporary storage unit 131, so the flow of the raw coal in the fluidized bed S1. Defective, adhesion to the surroundings and accumulation can be suppressed.

  Further, in the fluidized bed drying apparatus according to the second embodiment, the raw coal recirculation path 133 that returns the raw coal stored in the temporary storage unit 131 to the raw coal inlet 102 is provided. Therefore, the raw coal stored in the temporary storage unit 131 is returned to the raw coal inlet 102 through the raw coal recirculation path 133 and re-introduced into the drying vessel 101, thereby efficiently heating the raw coal. Can be dried.

  FIG. 8 is a cross-sectional view illustrating a first drying chamber in a fluidized bed drying apparatus according to Embodiment 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 Example 3, as shown in FIG. 8, a raw coal removing device 123 that removes excess raw coal in the fluidized bed S <b> 1 of the first drying chamber 111 is provided in the first drying chamber 111. The raw coal removing device 123 includes a scraper 124, a support rod 125, and a driving device 126. Moreover, the temporary storage part 131 which stores raw coal temporarily is provided in the side part of the drying container 101, and this temporary storage part 131 returns the raw coal to the raw coal injection port 102, and recycles the raw coal. A path 133 is provided, and a transport device 134 is attached.

  Further, the raw coal removing device 123 is provided with a fluidized gas ejecting device for ejecting a fluidized gas from the surface of the fluidized bed S <b> 1 as the scraper 124 moves. That is, the support rod 125 has a pipe shape, and a plurality of gas ejection ports 141 are formed at a predetermined interval in the longitudinal direction on the lower end portion, that is, between the scraper 124 and the driving device 126. Further, the support rod 125 has a base end portion extending through the drive device 126 and is connected to a fluidizing gas supply source (not shown) via a flow rate adjustment valve 142.

  Therefore, when raw coal is introduced into the first drying chamber 111 in the drying container 101 from the raw coal introduction port 102, the raw coal flows in the fluidized bed S1 by the fluidizing gas and is heated by the heat transfer tube 106. To be dried. As a result, the raw coal forming the fluidized bed S1 of the first drying chamber 111 can be made into a completely mixed flow, and is dried so that the moisture content (moisture content) is uniform.

  At this time, when the raw coal charged into the first drying chamber 111 from the raw coal charging port 102 is accumulated above the support plates 121 in the fluidized bed S1 and becomes excessive, the raw coal removing device 123 is activated. And remove. That is, the drive device 126 moves the scraper 124 forward via the support rod 125, thereby moving excess raw coal accumulated in the fluidized bed S <b> 1 to the temporary storage unit 131. And the raw coal stored in the temporary storage part 131 by the conveying apparatus 134 is returned to the raw coal inlet 102 from the raw coal recirculation path 133, and is supplied into the 1st drying chamber 111 with new raw coal.

  At this time, the flow rate adjustment valve 142 is opened, the fluidizing gas from the fluidizing gas supply source is supplied to the support rod 125, and ejected from the gas ejection ports 141 toward the surface of the fluidized bed S1. Then, fluidization gas can be promoted by supplying fluidized gas to the inside from the surface of fluidized bed S1. Further, if there is raw coal adhering to the heat transfer tube 106, the support plate 121, or the inner wall surface of the drying container 101, it can be removed.

  As described above, in the fluidized bed drying apparatus of Example 3, the raw coal removing device 123 for removing excess raw coal in the fluidized bed S1 is provided, and the inside of the fluidized bed S1 from the surface of the fluidized bed S1 as the scraper 124 moves. As a fluidized gas ejection device for ejecting fluidized gas, a plurality of gas ejection ports 141 are provided on the lower surface portion of the support rod 125.

  Therefore, if there is an excess raw coal in the fluidized bed S1, the raw coal removal device 123 moves the excess raw coal in the fluidized bed S1 to the temporary storage unit 131, so the flow of the raw coal in the fluidized bed S1. Defective, adhesion to the surroundings and accumulation can be suppressed. At this time, the fluidization of the raw coal can be promoted by ejecting the fluidizing gas from each gas ejection port 141 of the support rod 125 toward the fluidized bed S1 as the scraper 124 moves. The raw coal adhering to the heat transfer tube 106, the support plate 121, and the like can be removed.

  FIG. 9 is a schematic side view showing a fluidized bed drying apparatus according to Embodiment 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. 9, a raw coal removing device 123 that removes excess raw coal in the fluidized bed S <b> 1 of the first drying chamber 111 is provided in the first drying chamber 111. The raw coal removing device 123 includes a scraper 124, a support rod 125, and a driving device 126. Further, a scraper swinging device 151 that swings (rotates) the scraper 124 with the support rod 125 as a fulcrum and can stir the fluidized bed S1 is provided. In this case, the scraper 124 needs to be set to have a large width with respect to the height.

  Therefore, when raw coal is introduced into the first drying chamber 111 in the drying container 101 from the raw coal introduction port 102, the raw coal flows in the fluidized bed S1 by the fluidizing gas and is heated by the heat transfer tube 106. To be dried. As a result, the raw coal forming the fluidized bed S1 of the first drying chamber 111 can be made into a completely mixed flow, and is dried so that the moisture content (moisture content) is uniform.

  At this time, when the raw coal charged into the first drying chamber 111 from the raw coal charging port 102 is accumulated above the support plates 121 in the fluidized bed S1 and becomes excessive, the raw coal removing device 123 is activated. And remove.

  In addition, when the raw coal is insufficiently fluidized in the fluidized bed S1 and the raw coal is agglomerated, the scraper oscillating device 151 reciprocally swings the scraper 124 via the support rod 125. As a result, the left and right end portions of the scraper 124 enter the fluidized bed S1 and agitate it, and the lump of raw coal can be broken and dispersed.

  As described above, in the fluidized bed drying apparatus of Example 4, the raw coal removing device 123 for removing excess raw coal in the fluidized bed S1 is provided, and the scraper 124 of the raw coal removing device 123 is swung to flow. A scraper swing device 151 capable of stirring the layer S1 is provided.

  Therefore, if there is an excess raw coal in the fluidized bed S1, the raw coal removal device 123 moves the excess raw coal in the fluidized bed S1 to the temporary storage unit 131, so the flow of the raw coal in the fluidized bed S1. Defective, adhesion to the surroundings and accumulation can be suppressed. Further, when the scraper 124 is swung by the scraper swinging device 151, the scraper 124 enters the fluidized bed S1 and stirs the raw coal, so that the raw coal can be broken and dispersed. The fluidization of can be promoted.

  In each of the above-described embodiments, the wet fuel removing device is configured by the movable scraper 124, but the configuration of the scraper 124 is not limited to the embodiment. For example, the pressing angle (front angle) of the raw coal in the scraper may be 90 degrees or more with respect to the horizontal plane, and the left-right direction may be 180 degrees or more with respect to the vertical plane. That is, by making the front surface of the scraper wedge-shaped, it is possible to appropriately move excess raw coal to a predetermined position or diffuse it over a wide range.

  Further, the wet fuel removing device is not limited to the scraper 124, and for example, the wet fuel removing device may be moved to a rotating brush or moved by an injection gas.

  Moreover, in each Example mentioned above, although the inside of the drying container 101 was divided into the 1st drying chamber 111 and the 2nd drying chamber 112, it is good also as only the 1st drying chamber 111 or the 2nd drying chamber 112 only. 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 gas supply unit 104, the gas outlet 105, and the heat transfer tubes 106 and 107 are limited to the respective embodiments. It is not a thing and can be suitably changed according to the installation place, application, etc. of the fluidized bed drying apparatus 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. .

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 (Wet fuel input part)
103 Dry coal discharge port (dry matter discharge part)
104 Fluidizing gas supply unit 105 Gas outlet (gas outlet)
106,107 Heat transfer tube (heating unit)
111 1st drying chamber 112 2nd drying chamber 123 Raw coal removal device (wet fuel removal device)
124 scraper 125 support rod 126 driving device (scraper moving device)
129 Partition plate 131 Temporary storage unit 133 Raw coal recirculation path (wet fuel recirculation path)
134 Conveying device 141 Gas outlet 151 Scraper swinging device F, F1, F2 Free board part S, S1, S2 Fluidized bed

Claims (8)

A drying container having a hollow shape;
A wet fuel charging unit for charging wet fuel to one end of the drying container;
A dry matter discharge unit for discharging dry matter obtained by heating and drying wet fuel from the other end of the drying container;
A fluidized gas supply unit that forms a fluidized bed with wet fuel by supplying fluidized gas to a lower portion of the drying container;
A gas discharge part for discharging fluidized gas and generated steam from above the drying container;
A heating unit for heating the wet fuel in the fluidized bed;
A wet fuel removal device for removing excess wet fuel in the fluidized bed;
A fluidized bed drying apparatus comprising:   The fluidized bed has a first fluidized region set to a predetermined first superficial velocity and a second fluidized region set to a second superficial velocity higher than the first superficial velocity, and the wet 2. The fluidized bed drying apparatus according to claim 1, wherein the fuel removing device moves excess wet fuel in the first fluidized region to the second fluidized region. 3.   A temporary storage unit that temporarily stores wet fuel is provided on a side portion of the drying container in a flow direction, and the wet fuel removal device moves excess wet fuel in a fluidized bed to the temporary storage unit. The fluidized bed drying apparatus according to claim 1.   4. The fluidized bed drying apparatus according to claim 3, further comprising a wet fuel recirculation path for returning the wet fuel stored in the temporary storage unit to the wet fuel charging unit.   The wet fuel removing device includes a scraper capable of moving excess wet fuel at an upper portion of the fluidized bed, and a scraper moving device capable of moving the scraper laterally in a flow direction. The fluidized bed drying apparatus according to any one of 1 to 4.   The fluidized bed according to claim 5, wherein the heating unit is a heat transfer tube through which superheated steam flows, and the scraper moves wet fuel above the heat transfer tube to the side in the flow direction. Drying equipment.   The fluidized-bed drying according to any one of claims 1 to 6, further comprising a fluidized-gas ejecting device that ejects a fluidized gas from the surface of the fluidized bed to the inside as the scraper moves. apparatus.   The fluidized bed drying apparatus according to any one of claims 1 to 7, further comprising a scraper swinging device capable of swinging the scraper and stirring the fluidized bed.

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