JP2014159934A - Raw material supply device and method, and fluidized bed drying equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a raw material supply device, fluidized bed drying equipment, and a raw material supply method, capable of stably supplying a wet raw material to a fluidized bed drying device while suppressing attachment of the wet raw material.SOLUTION: A raw material supply device 101 is a wet raw material supply device for supplying a wet raw material 130 to be dried to a fluidized bed drying device 102, and is provided with a coal supply pipe 151 disposed at an upper portion of a drying chamber for supplying the powdered wet material 130 from the upper portion of the drying chamber to a vertical lower side, and a spiral guide plate 152 disposed at a lower end portion side of the coal supply pipe, and having a diameter gradually reduced downward to guide the wet raw material supplied from the coal supply pipe 151 into the drying chamber. The wet raw material 130 can be uniformly dispersed in supplying the same into the fluidized bed drying device 102.

Description

  The present invention relates to a raw material supply apparatus, a fluidized bed drying facility, and a raw material supply method capable of stably supplying a wet raw material to a fluidized bed drying apparatus while suppressing attachment of the wet raw material.

  For example, a coal gasification combined cycle power generation facility that gasifies solid carbonaceous fuel such as coal as a raw material can be combined with combined cycle power generation to further increase efficiency and increase efficiency compared to conventional coal thermal power generation. It is a power generation facility aimed at environmental friendliness. This coal gasification combined power generation facility is also known to be able to use coal with abundant resources, and it is known that the applicable coal types can be expanded.

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

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

  As an apparatus for supplying lignite to a fluidized bed drying apparatus, there is an apparatus for conveying lignite stored in a supply hopper by a rotary feeder.

JP 2008-89243 A

  By the way, the material supplied to the fluidized bed drying apparatus is a wet raw material containing a lot of moisture. Therefore, there is a possibility that lignite adheres to the supply device that supplies the wet raw material to the fluidized bed drying device. When lignite adheres, the supply of lignite to the fluidized bed dryer becomes unstable. As described above, there is a method of supplying nitrogen or the like as a method of suppressing adhesion of the wet raw material to the supply device. However, a mechanism for using nitrogen gas in the supply unit is required. Further, since the purge gas is mixed in the fluidized bed drying device, the temperature in the fluidized bed drying device is lowered.

  Therefore, the present invention provides a raw material supply device, a fluidized bed drying facility, and a raw material supply method capable of stably supplying a wet raw material to a fluidized bed drying device while suppressing the attachment of the wet raw material. Let it be an issue.

  A first invention of the present invention for solving the above-mentioned problems is provided in an upper part of a container, and a raw material supply pipe for guiding a powdery raw material downward from the upper part of the container, and the raw material supply In the raw material supply apparatus, a spiral guide plate having a diameter gradually reduced in a downward direction for guiding the raw material supplied from the raw material supply pipe into the container is provided on a lower end side of the pipe.

  According to a second aspect of the present invention, there is provided the raw material supply apparatus according to the first aspect, further comprising a drive device that drives either one or both of the raw material supply pipe and the spiral guide plate.

  A third invention is the raw material supply apparatus according to the first or second invention, wherein the raw material is a wet raw material.

  A fourth invention includes the raw material supply device according to any one of the first to third aspects, and a fluidized bed drying device capable of drying the raw material supplied by the raw material supply device. Located in fluidized bed drying facility.

  A fifth invention uses the raw material supply device according to any one of the first to third inventions, and is supplied from the raw material supply pipe that supplies the supplied raw material downward in the vertical direction, and the raw material supply pipe. Further, the raw material supply method is characterized in that the raw material is distributedly supplied by a spiral guide plate having a diameter gradually reduced in a downward direction for guiding the raw material into the container.

  According to the present invention, since the spiral guide plate is provided on the lower end side of the coal feed pipe for supplying the raw material, the supply of the raw material is more uniformly dispersed in the fluidized bed drying apparatus.

FIG. 1 is a schematic diagram of a fluidized bed drying facility according to the first embodiment. FIG. 2 is a schematic diagram illustrating a schematic configuration of the wet raw material supply apparatus according to the first embodiment. FIG. 3 is a perspective view illustrating a schematic configuration of the spiral guide plate according to the first embodiment. FIG. 4 is a top view illustrating a schematic configuration of the spiral guide plate according to the first embodiment. FIG. 5 is a schematic diagram illustrating a schematic configuration of the wet raw material supply apparatus according to the second embodiment. FIG. 6 is a schematic diagram showing the rotation support structure of the coal supply pipe of the raw material supply apparatus according to the present embodiment. FIG. 7 is a schematic diagram illustrating a schematic configuration of another wet raw material supply apparatus according to the second embodiment. FIG. 8 is a schematic diagram illustrating a schematic configuration of the wet raw material supply apparatus according to the third embodiment. FIG. 9 is a schematic diagram illustrating a schematic configuration of the wet raw material supply apparatus according to the fourth embodiment. FIG. 10 is a schematic configuration diagram of the coal gasification combined power generation facility of the present embodiment.

  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.

  FIG. 1 is a schematic diagram of a fluidized bed drying facility according to Example 1 of the present invention. FIG. 10 is a schematic configuration diagram of the coal gasification combined power generation facility of the present embodiment.

  The present embodiment is an integrated coal gasification combined cycle (IGCC) that gasifies solid carbonaceous fuel such as coal as a raw material. The coal gasification combined cycle facility gasifies air as an oxidizing agent. An air combustion system for generating coal gas in a furnace is adopted, and coal gas after purification by a gas purification device is supplied as fuel gas to gas turbine equipment for power generation. That is, the coal gasification combined power generation facility of the present embodiment shows an air combustion type (air blowing) power generation facility as an example, but may be an oxygen blowing method using a gas having a high oxygen concentration as an oxidant.

  In this embodiment, as shown in FIG. 10, 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, a crusher 23, a supply hopper 24, and a supply pipe 25. The raw coal bunker 21 can store raw coal having a high water content (for example, wet raw materials such as coal and lignite), and can drop a predetermined amount of raw coal into the coal feeder 22. The coal feeder 22 can transport the raw 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 pulverize the dropped coal into a predetermined size to obtain a powdery wet raw material. A predetermined amount of the pulverized coal powder is supplied to the fluidized bed drying device 12 via the supply hopper 24 and the supply pipe 25. Further, the raw coal powder form is not in a liquid form and is not a large solid size of several centimeters or more due to an uncrushed state or the like. Since the coal in the present embodiment is in a wet state containing water, the crushed raw coal is expressed as a powder, including those that have become a certain mass.

  The fluidized bed drying device 12 supplies fluidized steam (fluidized gas) to the coal introduced by the coal feeder 11 so as to heat and dry the coal while it is in a wet state. The moisture contained in the coal can be removed. The fluidized bed drying device 12 is provided with a cooler 31 that cools the extracted dry coal, and the dry coal is stored in the dry coal bunker 32. Further, the fluidized bed drying apparatus 12 is provided with a cyclone 33 and an electric dust collector 34 for separating dry coal particles from the extracted steam, and the dry coal particles separated from the steam are stored in the dry coal bunker 32. The steam from which the dry coal is separated by the electric dust collector 34 is compressed by the compressor 35 and then supplied to the fluidized bed drying apparatus 12 as heating steam.

  The pulverized coal machine 13 is a coal pulverizer, and pulverizes 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 pulverized coal having a predetermined particle size or less. The pulverized coal after being pulverized by the pulverized coal machine 13 is separated from the transfer gas by the bag filters 37a and 37b and stored in the 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 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. A gas purification device 74 and a chimney 75 are connected to the exhaust heat recovery boiler 20.

  In the combined coal gasification combined power generation facility 10 of the present embodiment configured as above, the raw coal is dropped into the crusher 23 by the coal feeder 22 and crushed by the coal feeder 11, and the pulverized coal is After being heated and dried by the fluidized bed drying device 12, it is cooled by the cooler 31 and stored in the dry coal bunker 32. The dry coal of the dry coal bunker 32 is pulverized by the pulverized coal machine 13 to produce pulverized coal, and is stored in the pulverized coal supply hoppers 38a and 38b. The pulverized coal stored in the pulverized coal supply hoppers 38a and 38b is supplied to the coal gasification furnace 14, and combusted with compressed air to be gasified, thereby combustible gas (coal gas containing carbon dioxide as a main component). ) Is generated. The combustible gas is separated into char by the char recovery device 15 and sent to the gas purification device 16.

  In the gas purification device 16, the combustible gas is purified by removing impurities such as sulfur compounds and nitrogen compounds 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 generates combustion gas by mixing the compressed air and the fuel gas and combusting, The turbine 63 is driven to generate power by the generator 19. The exhaust gas discharged from the gas turbine equipment 17 generates steam in the exhaust heat recovery boiler 20 and supplies the steam to the steam turbine equipment 18. In the steam turbine facility 18, the turbine 69 is driven by this steam and the generator 19 generates power. 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.

  Here, the fluidized bed drying facility according to the present embodiment will be described in detail. FIG. 1 is a schematic diagram of a fluidized bed drying facility according to the present embodiment.

  The fluidized bed drying facility 100 according to the present embodiment supplies and dries a wet raw material 130 such as lignite having a high water content, which is one of the wet raw materials, as raw coal that is to be dried. As shown in FIG. 1, a fluidized bed drying apparatus 100 according to the present embodiment is supplied with a wet raw material supply device 101 (raw material supply device) that supplies wet raw material 130 and the like introduced via a hopper (not shown). The fluidized bed drying device 102 for drying the wet raw material 130, the dust collecting device 104 for removing dust in the generated steam 103 discharged from the fluidized bed drying device 102, and the dry coal 131 discharged from the fluidized bed drying device 102. The heat is recovered by the cooler 105 that cools the product to the product charcoal 132, the heat recovery system 111 that is disposed downstream of the dust collector 104, and recovers the heat of the generated steam 103, and the heat recovery system 111. A water treatment unit 112 that processes the generated steam 103 and discharges it as waste water 113 and a part of the generated steam 103 discharged from the dust collector 104 circulates and flows as fluidized steam 106. And a circulation device 107 supplies to the drying device 102.

  Here, as shown in FIG. 1, the fluidized bed drying apparatus 102 of the present embodiment is a plug flow type drying apparatus, which is divided by a plurality of partition plates 109A and 109B, from the supply side of the wet raw material to the discharge side. A first drying chamber 102A provided on the upstream side (one end side) in the flow direction toward the first direction, a second drying chamber 102B provided on the downstream side (the other end side) from the first drying chamber, A drying chamber (container) composed of the third drying chamber 102C provided on the most downstream side in the flow direction is provided, the wet raw material 130 is supplied from the first drying chamber 102A side, and from the end of the third drying chamber 102C Dry coal 131 is discharged.

The fluidized bed drying chambers 102A to 102C are configured as a plug flow system so that the supplied wet raw material 130 is extruded. This extruding flow is a flow that extrudes in the flow direction toward the discharge side where the wet raw material is made into dry coal and discharged so that the wet raw material does not diffuse in the flow direction in the formed fluidized bed S.
In the present embodiment, three fluidized drying layer chambers are provided via the partition plates 109A and 109B, but the present invention is not limited to this.

Further, the fluidized bed drying equipment 100 serves as a pipe connecting the respective parts, and the generated steam 103 generated when the wet raw material 130 is dried is discharged out of the fluidized bed drying apparatus 102 and guided to the dust collecting apparatus 104. the line L _1, the dust collecting device 104 branches a part of the steam generated 103 dust is removed from the fluidizing steam (fluidizing gas) 106 as a fluidized bed dryer 102 fluidizing steam supply line L to be supplied to the ₂ , a separation line L ₃ for supplying the dry coal 133 collected by the dust collector 104 to a pipe through which the dry coal 131 is discharged from the fluidized bed dryer 102, and a cooler for the dry coal 131 and the dry coal 133 the product line _{L 4} for discharging the product coal 132 generated by cooling at 105, comprises.
The fluidized steam 106 is introduced into the fluidized bed S in the fluidized bed drying chambers 102A to 102C via the wind box 108a and the dispersion plate 108b of the fluidized bed drying apparatus 102.

  The wet raw material supply apparatus 101 is provided in the upper part of the first drying chamber 102A, which is one end side of the drying chamber, and supplies the stored wet raw material 130 into the fluidized bed drying apparatus 102. The wet raw material supply apparatus 101 will be described later.

  The fluidized bed drying apparatus 102 forms a fluidized bed S with the wet raw material 130 supplied from the wet raw material supply apparatus 101 and the fluidized steam 106, and the wet raw material 130 is discharged to the exhaust side where the wet raw material is converted into dry coal. While being moved in the direction of flow, it is dried by heating with heating means to obtain dry charcoal 131. In the fluidized bed drying apparatus 102, the fluidized steam 106 and the steam generated during drying are mixed to form a generated steam 103. The fluidized bed drying apparatus 102 includes a heat transfer member 120 as a heating means provided therein, a superheated steam supply device (high temperature gas supply means) 121 capable of supplying superheated steam (high temperature gas) A to the heat transfer member 120, and .

The dust collector 104 is a cyclone, a porous filter, an electric dust collector, or the like, and separates dust (dry coal) contained in the generated steam 103. Here, the generated steam 103 includes dry charcoal 133 obtained by drying and pulverizing the wet raw material 130. The dust collector 104 collects and separates the pulverized dry coal 133 contained in the generated steam 103. Dust collector 104, dried coal 133 separated, is supplied to the separation line _{L 3.} Dry coal 133 supplied to the separation line L ₃ are mixed and joins the dry brown coal 131 withdrawn from the fluidized bed dryer 102 through.

The cooler 105 cools the dried dry charcoal 131 in which the dried charcoal 133 is mixed with the dried lignite 131 discharged from the fluidized bed drying apparatus 102. Cooler 105 discharges from the product line _{L 4} dried coal 131 cooling as product coal 132. This product charcoal 132 is supplied to the coal gasifier 14 as described above.

  The heat recovery system 111 is a system that recovers the heat of the generated steam 103 by heat exchange or the like. The heat recovery system 111 performs heat recovery for the generated steam 103. The water treatment unit 112 is a treatment device that treats the generated steam 103 that has been heat-recovered by the heat-recovery system 111. The water treatment unit 112 treats the generated steam 103 that has been heat-recovered by the heat-recovery system 111 and discharges the generated steam 103 to the outside of the fluidized bed drying facility 100 as waste water 113.

Further, the circulating apparatus 107 is interposed in fluidized steam supply line L _2, and sends the fluidization steam flowing fluidization steam supply line L ₂ in a predetermined direction. Specifically, a part of the generated steam 103 that has been collected through the fluidized steam supply line L ₂ is sent into the fluidized bed drying apparatus 102. The generated steam 103 sent into the fluidized bed drying apparatus 102 is used as fluidized steam 106 that causes the fluidized bed of the wet raw material 130 to flow. In addition, although the fluidized bed drying equipment 100 of the present embodiment reuses a part of the generated steam 103 as a fluidizing gas for fluidizing the fluidized bed, the present invention is not limited to this, for example, nitrogen, carbon dioxide or Low oxygen concentration air containing these gases, nitrogen, other inert gas or a mixed gas thereof, or a mixed gas of these and steam may be used.

  In addition, the fluidized bed drying facility 100 of the present embodiment uses a part of the generated steam 103 after being collected by the dust collector 104 in the heat recovery system 111 and uses the remaining part as the fluidized steam 106. However, the present invention is not limited to this. In the fluidized bed drying facility 100, the generated steam 103 collected by the dust collector 104 may be processed by, for example, a heat exchanger, a steam turbine, or the like so as to effectively use the heat.

  Next, a wet raw material supply apparatus (hereinafter also referred to as “raw material supply apparatus”) 101 will be described with reference to FIGS. 2 and 3. FIG. 2 is a schematic diagram illustrating a schematic configuration of the wet raw material supply apparatus according to the present embodiment. FIG. 3 is a perspective view illustrating a schematic configuration of the spiral guide plate according to the first embodiment. FIG. 4 is a top view illustrating a schematic configuration of the spiral guide plate according to the first embodiment.

  As shown in FIG. 2, the raw material supply apparatus 101 of the present invention is a wet raw material supply apparatus that supplies a wet raw material 130 to be dried to the fluidized bed drying apparatus 102, and is a first drying chamber that is one end side of the drying chamber. 102A, a coal feed pipe (raw material supply pipe) 151 that feeds the wet raw material 130 downward in the vertical direction, and a wet raw material on the lower end side of the coal feed pipe 151, in the fluidized bed drying chamber. 1 A spiral guide plate 152 is provided to guide the inside of the drying chamber 102A.

The spiral guide plate 152 is fixedly provided on the top plate 102a on the upper side of the first drying chamber 102A, which is one end side of the drying chamber, and starts from a place where a certain fall distance is provided from the outlet 151d of the coal supply pipe 151. Thus, the spiral chute (for example, the first spiral chute 152a to the fourth spiral chute 152d in the present embodiment) which is gradually reduced in diameter downward is continuously formed. The number of turns of the spiral chute is not limited to the present embodiment, and may be appropriately changed depending on the size of the drying apparatus and the wet raw material to be supplied.
As a result, the wet raw material 130 that falls on the first spiral chute 152a to the fourth spiral chute 152d will naturally fall after having reached, for example, three rotations. The other wet raw materials naturally fall from the edges of the first spiral chute 152a to the fourth spiral chute 152d.

  Therefore, an inverted frustoconical hollow cylindrical portion 153 for installing the spiral guide plate 152 is provided so as to fall on the first spiral chute 152a with a predetermined distance from the outlet of the coal supply pipe 151. ing.

  As shown in FIG. 4, when the spiral guide plate 152 is viewed from above the coal supply pipe 151 side, the diameter of the second spiral chute 152 b that continues downward from the first spiral chute 152 a that falls first is the diameter. The diameter is smaller than that of the first spiral chute 152a, and a plurality of layers (four layers in this embodiment) are formed. Therefore, the opening 155 of the fourth spiral chute 152d at the end is smaller than the first spiral chute 152a to the third spiral chute 152c.

Here, when viewed from above the spiral guide plate 152, the spiral chute positioned on the lower side can be seen like a conch vortex, but the present invention is not limited to this, The degree of diameter reduction of the first spiral chute 152a to the fourth spiral chute 152d is appropriately changed according to the supply amount and the adhesion degree of the wet raw material, and the diameter reduction ratio of the first spiral chute 152a to the fourth spiral chute 152d is reduced. , And the central portion of the large opening 155 may be hollowed out.
If the amount of the opening 155 is too large, the amount of the wet raw material falling as it is increases, so that it may be appropriately changed at the time of design.

  The wet raw material 130 falling in the vertical direction from the coal supply pipe 151 first falls on the first spiral chute 152 a of the spiral guide plate 152. And a part falls from the edge part of the 1st spiral chute 152a, and the remainder is sent to the 2nd spiral guide chute 152b side located in the downward direction as it is. Thereby, the wet raw material 130 falling from the edge is uniformly supplied in a concentric manner.

  The inclination angle of the spiral guide plate 152 is preferably equal to or greater than the repose angle (repose angle: α) of the powder as the raw material to be supplied. In addition, the inclination angle from the first spiral chute 152a to the second spiral chute 152b is slightly stiffer than that of the subsequent spiral chute so that it is easy to slide, and the subsequent spiral chute has a gentle angle greater than the repose angle. Also good.

  On the other hand, when a slippery raw material is supplied, the falling speed may be controlled with a gentle angle.

  According to the wet raw material supply apparatus 101 as in the present embodiment, when the wet raw material 130 is introduced in the vertical axis direction through the coal supply pipe 151, it is dispersed concentrically on the spiral guide plate 152 when the wet raw material 130 is dropped. By being dropped, uniform distributed supply into the first drying chamber 102A of the fluidized bed drying chamber is realized.

  As a result, even when the wet raw material charging load to the first drying chamber 102A is high, uniform distributed supply is performed, so that stable fluidity can be ensured.

  In this example, a wet raw material was applied as a raw material. However, if the water content is high, low-grade coal including subbituminous coal or the like, peat such as sludge may be applied, and high-grade coal may be used. Even if it exists, it is applicable. Further, the wet raw material is not limited to coal such as lignite, but may be biomass used as an organic resource derived from renewable organisms, for example, thinned wood, waste wood, driftwood, grass, Waste, sludge, tires, and recycled fuel (pellets and chips) made from these can be used.

Next, the wet raw material supply apparatus according to the second embodiment will be described. In addition, the same code | symbol is attached | subjected to the same member as the structure of the wet raw material supply apparatus which concerns on Example 1, and the description is abbreviate | omitted.
FIG. 5 is a schematic diagram illustrating a schematic configuration of the wet raw material supply apparatus according to the present embodiment. FIG. 6 is a schematic diagram showing a support structure of a coal supply pipe of the raw material supply apparatus according to the present embodiment. FIG. 7 is a schematic diagram illustrating a schematic configuration of another wet raw material supply apparatus according to the second embodiment.
In the first embodiment, the coal supply pipe 151 and the spiral guide plate 152 are fixed, but in this embodiment, the coal supply pipe 151 side can be rotated by the driving device 160.

  Further, the wet raw material supply apparatus 101 of the present embodiment is provided on the lower inner surface side of a cylindrical coal supply pipe 151 that inputs the wet raw material 130 in the vertical axis direction, and the wet raw material 130 attached to the inner peripheral wall surface 151a is provided. A scraper 157 for scraping is provided. The wet raw material 130 scraped off by the scraper 157 is dropped and dispersed / injected into the first drying chamber 102A via the spiral guide plate 152.

  Here, as shown in FIG. 6, the lower end portion of the coal supply pipe 151 is rotatably supported through a sliding means 102c such as a bearing provided around the vicinity of the opening 102b of the top plate 102a. ing.

  In the present embodiment, the coal feeding pipe 151 can be rotated with the central axis of the coal feeding pipe 151 as a base point by driving the driving device 160, and the scraper 157 and the inner peripheral wall surface 151a are in sliding contact with each other during the rotation. The scraper 157 ensures the scraping of the wet raw material 130 adhering to the inner peripheral wall surface 151a. The driving device 160 is fixed by support means (not shown).

Here, as shown in FIG. 6, the scraper 157 is supported and fixed to the top plate 102 a of the fluidized bed drying apparatus 102 via a support member 154.
Further, in order to prevent gas leakage from the inside of the coal supply pipe 151 when the coal supply pipe 151 rotates, a steam seal means 156 for introducing steam into the inside is provided so as to cover the lower end portion of the coal supply pipe 151. ing. And in the steam seal means 156, by introducing the steam 155 from the outside, the gas leakage from the inside is prevented.
The steam to be introduced is, for example, about 150 ° C., and when introduced into the coal feeding pipe 151, the coal feeding pipe 151 and the scraper 157 are warmed. Can be prevented from adhering to the inner peripheral wall surface 151a of the coal feeding pipe 151 and the scraper 157, and contribute to heating and drying of the wet raw material 130.

  According to the wet raw material supply apparatus 101 as in the present embodiment, when the wet raw material 130 is introduced to the lower side in the vertical direction via the coal supply pipe 151, adhesion, blockage, etc. occurred inside the coal supply pipe 151. Even in this case, rotation of the coal feeding pipe 151 by driving of the driving device 160 suppresses the wet raw material 130 from being attached and closed inside the coal feeding pipe 151, and the scraper 157 The wet raw material 130 adhering to the peripheral wall surface 151a is scraped off and removed. As a result, adhesion and blockage of the wet raw material 130 are suppressed, and thereafter, the spiral guide plate 152 realizes uniform dispersion supply into the first drying chamber 102A of the fluidized bed drying chamber.

  As a result, even when the wet raw material charging load to the first drying chamber 102A is high, uniform distributed supply is performed, so that stable fluidity can be ensured.

  Here, in the present embodiment, the scraper 157 is provided on the lower inner surface side of the coal supply pipe 151, but the present invention is not limited to this. For example, depending on the degree of adhesion of the wet raw material 130, the scraper 157 You may make it each extend in a center part direction or an upper part direction. By doing in this way, it becomes possible to scrape the wet raw material 130 adhering to the inner peripheral wall surface 151a in the center portion direction or the upper portion direction of the coal supply pipe 151.

  As the material of the scraper 157, for example, stainless steel is used. For example, a resin material or the like is used so that when the wet raw material 130 attached is scraped off, the escape action by bending is exhibited. The lock may be prevented.

  The rotation of the coal supply pipe 151 by the driving device 160 is preferably a slow rotation with a rotation speed of, for example, about 5 rpm to several tens of rpm from the viewpoint of stable supply.

  As described above, by using the raw material supply apparatus 101 of the present embodiment, in the plug flow type fluidized bed drying apparatus 102, in order to secure fluidity when the wet raw material 130 is charged into the first drying chamber 102A. In addition, the wet raw material 130 can be uniformly dispersed.

Further, instead of installing the scraper 157, screw means 159 may be further provided inside the coal supply pipe 151 as shown in FIG. By providing the screw means, blockage inside the coal supply pipe 151 can be suppressed.
Alternatively, only the screw means 159 may be installed alone in the coal supply pipe 151 without installing the scraper 157.

Next, a wet raw material supply apparatus according to Example 3 will be described. In addition, the same code | symbol is attached | subjected to the same member as the structure of the wet raw material supply apparatus which concerns on Example 1 or 2, and the description is abbreviate | omitted.
FIG. 8 is a schematic diagram illustrating a schematic configuration of the wet raw material supply apparatus according to the present embodiment.
In the second embodiment, the coal supply pipe 151 can be rotated by the driving device 160, but in this embodiment, the spiral guide plate 152 side is rotated by the driving device 161.

In the present embodiment, the spiral guide plate 152 is suspended from the lower end portion side of the outer cylinder 171 disposed on the outer periphery of the coal supply pipe 151 via the connecting portion 172, and the outer cylinder 171 is driven by the driving device 161. Thus, the scraper 157 and the spiral guide plate 152 side are driven.
In addition, the lower end part of the outer cylinder 171 is rotatably supported through sliding means 102c such as a bearing that is provided along the vicinity of the opening 102b of the top plate 102a, as in FIG.

  That is, the lower end portion of the scraper 157 and the upper end portion of the cylindrical portion 153 of the spiral guide plate 152 are connected and fixed by the connecting portion 172 by the connecting portion 172 connected to the lower end portion side of the outer cylinder 171. The spiral guide plate 152 is driven by rotating the motor with the driving device 161.

  Here, the coal supply pipe 151 is supported and fixed to the top plate 102 a of the fluidized bed drying apparatus 102 via a support member 156.

  Further, in order to prevent gas leakage from the inside during rotation of the coal supply pipe 151, a steam sealing means for introducing steam into the inside is provided from a through-hole through which the rotating shaft of the drive device 161 penetrates the support member 156. Steam 155 is introduced from the outside for gas sealing.

  Then, by driving the driving device 161, the outer cylinder 171 is rotated clockwise or counterclockwise, and the spiral guide plate 152 is rotated accordingly. As a result, the scraper 157 and the inner peripheral wall surface 151a are in sliding contact with each other inside the coal supply pipe 151, thereby ensuring the scraping of the wet raw material 130 adhering to the inner peripheral wall surface 151a by the scraper 157, and then spiral guiding. Guidance by the plate 152 is ensured, and when the wet raw material 130 is supplied to the inside of the fluidized bed drying apparatus 102 by the spiral guide plate 152, uniform dispersion thereof becomes possible.

Next, the wet raw material supply apparatus according to Example 4 will be described. In addition, the same code | symbol is attached | subjected to the same member as the structure of the wet raw material supply apparatus which concerns on Example 1 thru | or 3, and the description is abbreviate | omitted.
FIG. 9 is a schematic diagram illustrating a schematic configuration of the wet raw material supply apparatus according to the present embodiment. In the present embodiment, the driving devices 160 and 161 and the sealing means 156 are the same as the configurations of the second and third embodiments, and thus are not illustrated and simplified.
In the second and third embodiments, either the coal supply pipe 151 side or the spiral guide plate 152 side is rotated by the driving devices 160 and 161, but in the present embodiment, both are rotated relative to each other. I have to.

  In the present embodiment, when the coal supply pipe 151 side is rotated clockwise, the coal supply pipe 151 and the outer cylinder 171 are relatively rotated in order to rotate the spiral guide plate 152 side counterclockwise. Further, the scraping of the wet raw material 130 is made more reliable by rotating the coal feeding pipe 151 side, the scraper 157, the spiral guide plate 152, and the side in reverse. In addition, when the coal supply pipe 151 side is rotated counterclockwise, the scraper 157 and the spiral guide plate 152 side are rotated clockwise.

  Thereby, scraping of the wet raw material 130 adhering to the inner peripheral wall surface 151a in the scraper 157 by the sliding contact with the inner peripheral wall surface 151a of the scraper 157 inside the coal feeding pipe 151 from the second embodiment or the third embodiment. Then, when the wet raw material 130 is supplied to the inside of the fluidized bed drying apparatus 102 by the spiral guide plate 152, it can be uniformly dispersed.

Here, the performance evaluation of the wet raw material supply apparatuses of Examples 1 to 4 will be examined.
Table 1 shows the results of these evaluations.

表１に示すように、実施例１の原料供給装置の均一分散効果、シール性及び補機動力の評価を標準（○）とする場合、実施例２の原料供給装置の均一分散効果は、実施例１よりも優位性が発揮されるが、シール性がやや劣ることが判明した。また、スクレーパを備えていることにより閉塞防止効果が発揮された。なお、補機動力が劣ることが判明した。
実施例３の原料供給装置では、均一分散効果については、実施例２よりも優位性が更に発揮されるが、シール性及び補機動力が劣ることが判明した。
実施例４の原料供給装置では、均一分散効果については、実施例３よりも優位性が更に発揮されるが、シール性及び補機動力については、実施例３よりもやや劣ることが判明した。

As shown in Table 1, when the uniform dispersion effect, sealability and auxiliary power evaluation of the raw material supply apparatus of Example 1 are standard (O), the uniform dispersion effect of the raw material supply apparatus of Example 2 is Although superiority was exhibited over Example 1, it was found that the sealing performance was slightly inferior. Moreover, the blockage | prevention prevention effect was exhibited by providing the scraper. It was found that the auxiliary power was inferior.
In the raw material supply apparatus of Example 3, it was found that the uniform dispersion effect is further superior to that of Example 2, but the sealing performance and auxiliary power are inferior.
In the raw material supply apparatus of Example 4, superiority was further exhibited over Example 3 with respect to the uniform dispersion effect, but it was found that sealing performance and auxiliary power were slightly inferior to Example 3.

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 100 Fluidized bed drying equipment 101 Wet raw material Feeder (raw material feeder)
102 Fluidized bed dryer 130 Wet raw material 151 Coal feed pipe (raw material supply pipe)
152 spiral guide plates 152a to 152d first to fourth spiral chutes 157 scrapers 160 and 161 driving device

Claims (5)

A raw material supply pipe which is provided at the upper part of the container and guides the powdery raw material downward in the vertical direction from the upper part of the container;
A raw material supply apparatus having a spiral guide plate having a diameter gradually reduced in a downward direction for guiding the raw material supplied from the raw material supply pipe into the container on a lower end portion side of the raw material supply pipe. In claim 1,
A raw material supply apparatus having a drive device for driving either one or both of the raw material supply pipe and the spiral guide plate. In claim 1 or 2,
The raw material supply apparatus, wherein the raw material is a wet raw material. The raw material supply device according to any one of claims 1 to 3,
A fluidized bed drying apparatus comprising: a fluidized bed drying device capable of drying the raw material supplied by the raw material supply device. Using the raw material supply device according to any one of claims 1 to 3,
The raw material supply pipe for supplying the raw material to be supplied vertically downward;
A raw material supply method, wherein the raw material supplied from the raw material supply pipe is distributedly supplied by a spiral guide plate having a diameter gradually reduced in a downward direction for guiding the raw material into the container.

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