WO2012133309A1

WO2012133309A1 - Fluidized bed drying device and fluidized bed drying equipment

Info

Publication number: WO2012133309A1
Application number: PCT/JP2012/057755
Authority: WO
Inventors: 大浦　康二; 昇吾澤
Original assignee: 三菱重工業株式会社
Priority date: 2011-03-29
Filing date: 2012-03-26
Publication date: 2012-10-04
Also published as: AU2012233947A1; AU2012233947B2

Abstract

This fluidized bed drying device or fluidized bed drying equipment includes: a hollow drying vessel (101), a raw coal inlet (102) on one end of the drying vessel (101) to introduce raw coal, a dried coal outlet (103) to discharge, from the other end of the drying vessel (101), dried coal obtained by heat drying raw coal, a fluidization gas supply portion (104) that forms a fluidized bed (S) with raw coal by supplying fluidization gas to the lower part of the drying vessel (101), a gas outlet (105) that releases fluidization gas and generated steam from a higher point than the raw coal inlet (102) formed on one end of the drying vessel (101), a heat transfer tube (106) that heats the raw coal in the fluidized bed (S), and an inclined plate (111) that leads fluidization gas and generated steam to the gas outlet (105) by guiding fluidization gas and generated steam from the dried coal outlet (103) side to the raw coal inlet (102) side.

Description

Fluidized bed drying apparatus and fluidized bed drying equipment

The present invention relates to a fluidized bed drying apparatus for drying while flowing a material to be dried with a fluidized gas, and a fluidized bed drying apparatus including a fluidized bed drying apparatus for drying while flowing a wet raw material.

For example, the combined coal gasification combined power generation facility is a power generation facility aiming at higher efficiency and higher environmental performance than conventional coal-fired power by gasifying coal and combining it with combined cycle power generation. This coal gasification combined cycle power generation facility has a great merit that it can use coal with abundant resources, and it is known that the merit can be further increased by expanding the applicable coal types.

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

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

As a drying apparatus for drying such coal, there is one described in Patent Document 1 below. In this coal dry classification apparatus using a fluidized bed described in Patent Document 1, a dispersion plate is horizontally attached to the bottom side inside the apparatus body, and a fluidized bed is formed on the upper part, while a hot air inlet is formed on the lower part. In addition, a coal supply unit is provided at one end of the apparatus main body, a dry coal discharge unit is provided at the other end, a plurality of baffle plates are provided in the fluidized bed, and a large number of freeboard units above it are provided. The current plate is attached.

In addition, when coal gasification combined power generation facilities use lignite (wet raw material) as 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, resulting in power generation. Efficiency will decrease. 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. As a fluidized bed drying apparatus, there is a fluidized bed drying apparatus described in Patent Document 2.

Japanese Patent Application Laid-Open No. 11-083319 JP 2008-89243 A

As described above, low-grade coal has a larger amount of water than high-grade coal, and thus fluidization failure occurs in the drying apparatus, which may cause coal drying failure. Therefore, it is necessary to reduce the amount of coal to be input, and there is a problem that the processing amount decreases.

In addition, the fluidized bed drying apparatus discharges the steam generated when the wet raw material is dried while supplying the fluidized gas and the fluidized gas to the outside of the apparatus as generated steam. Fluidized bed drying equipment with fluidized bed drying equipment can improve the heat utilization efficiency and air utilization efficiency of the equipment by recovering the heat of the generated steam or using the generated steam as fluidized gas. it can. However, a large amount of scattered dust (dust) is mixed in the generated steam. For this reason, a large amount of dust mixed in the generated steam may adversely affect the apparatus for recovering latent heat and the apparatus for supplying again as fluidized gas.

The present invention solves the above-described problems, and fluidized bed drying capable of efficiently removing dust from the generated bed discharged from the fluidized bed drying apparatus and the fluidized bed drying apparatus that can improve the drying efficiency. The purpose is to provide equipment.

In order to achieve the above object, the fluidized bed drying apparatus of the present invention includes a drying container having a hollow shape, a wet raw material charging unit for charging a wet raw material into one end of the drying container, and the other end of the drying container. A dry matter discharge unit that discharges a dried product obtained by heating and drying the wet raw material, and a fluidized gas supply unit that forms a fluidized bed with the wet raw material by supplying a fluidizing gas to a lower part of the drying container, A gas discharge unit for discharging fluidized gas and generated steam from above the wet raw material input unit on one end side of the drying container, a heating unit for heating the wet raw material of the fluidized bed, the fluidized gas and the generation And a guide device that guides the steam from the dry matter discharge part side to the wet raw material input part side and guides it to the gas discharge part.

Therefore, when the wet raw material is charged into the drying container from the wet raw material charging part and the fluidizing gas is supplied to the lower part of the drying container from the fluidizing gas supply part, the wet raw material flows by the fluidizing gas. A fluidized bed is formed, and the wet raw material of the fluidized bed is heated by the heating unit to be dried to become a dry product. The dry product is discharged to the outside from the dry product discharge unit, while the fluidized gas and the wet raw material are discharged. Vapor generated by drying is discharged from the gas discharge portion to the outside. At this time, the fluidized gas and the generated steam are guided from the dry matter discharge part side to the wet raw material input part side by the guide device and guided to the gas discharge part, and are accompanied by the fluidized gas and the generated steam. The dried material particles are returned to the wet raw material input part side, mixed with the wet raw material and dried again in the fluidized bed, and it becomes possible to promote the heat drying of the wet raw material input from the wet raw material input part. The drying efficiency of the wet raw material can be improved.

In the fluidized bed drying apparatus of the present invention, the guide device is provided in a free board part above the fluidized bed, and the fluidized gas flowing from the dried material discharge part side to the wet raw material charging part side and the generation It has a collision plate that separates particles of the dry matter that accompanies the steam when it collides.

Therefore, the fluidized gas and the generated steam can flow from the dry matter discharge unit side to the wet raw material input unit side by the collision plate and can be appropriately guided to the gas discharge unit, and the dry matter accompanying the fluidized gas and the generated steam. When the particles collide with the impingement plate, the accompanying dry matter particles are properly separated and fall into the fluidized bed, and as a result, the dry matter separation performance can be improved.

In the fluidized bed drying apparatus of the present invention, the collision plate is opposed to the flow direction of the fluidized gas and the generated steam, and is arranged with a plurality of predetermined intervals in the flow direction, and is formed by the plurality of the collision plates. The lower end of the colliding plate group is arranged at a position inclined upward from the wet raw material charging part side toward the dry matter discharge part side.

Therefore, the fluidized gas and the generated steam are dried by disposing the lower end of the collision plate group formed of a plurality of collision plates at a position inclined upward from the wet raw material charging portion side toward the dry matter discharge portion side. It will flow from the material discharge part side to the wet raw material input part side, and this fluidized gas and generated steam can flow appropriately and be led to the gas discharge part.

In the fluidized bed drying apparatus of the present invention, the guide device is provided on a free board portion above the fluidized bed, and includes an inclined plate that is inclined upward from the wet raw material charging portion side toward the dry matter discharge portion side. It is characterized by having.

Accordingly, the fluidized gas and the generated steam flow along the lower surface of the inclined plate to the dry matter discharge unit side, and then flow over the inclined plate to the wet raw material charging unit side. While being able to guide from the dry matter discharge part side to the wet raw material input part side and appropriately lead to the gas discharge part, particles of the dry matter accompanying the fluidized gas and the generated steam fall on the inclined plate, The particles of the dried product can be properly returned to the wet raw material charging part side along the upper surface of the inclined plate.

In the fluidized bed drying apparatus of the present invention, a transport device is provided that transports the particles of the dried material dropped onto the inclined plate by the plurality of impingement plates to the wet raw material charging unit side in the drying container. Yes.

Therefore, when the fluidized gas and the generated steam flow over the inclined plate and collide with a plurality of collision plates, the accompanying dry matter particles are separated and fall on the inclined plate, and this dried matter is dried by the conveying device. It will be conveyed to the wet raw material input part side in a container, and this dry matter can be mixed with a wet raw material appropriately.

In the fluidized bed drying apparatus of the present invention, the guide device includes a partition plate that is provided in the free board portion above the fluidized bed and partitions the wet raw material input portion and the gas discharge portion. .

Therefore, by separating the wet raw material input part and the gas discharge part by the partition plate, the fluidized gas and the generated steam introduced from the dry matter discharge part side to the wet raw material input part side are transferred from the wet raw material input part to the outside. It is prevented from being discharged, and fluidized gas and generated steam can be properly introduced.

The fluidized bed drying equipment of the present invention includes a drying container, an input portion for supplying a wet raw material to one end of the drying container, and a discharge for discharging a dry product obtained by heating and drying the wet raw material from the other end of the drying container. The wet raw material charged in the drying container is separated into a drying chamber in which the wet raw material is dried and a chamber chamber vertically below the drying chamber, and a gas can be supplied from the chamber chamber to the drying chamber. A gas dispersion plate having holes formed therein, a fluidizing gas supplying a fluidizing gas forming a fluidized bed together with a wet raw material in the drying chamber, and the fluidizing gas being supplied to the chamber chamber A fluidized bed drying apparatus comprising a steam discharge unit for discharging generated steam generated by drying the wet raw material of the fluidized bed from above the drying container, and drying the wet raw material having a high water content in the dry container. When The generated steam line that discharges the generated steam discharged from the steam discharge unit of the fluidized bed drying device to the outside, and the generated steam line that cools the generated steam and removes dust contained in the generated steam. And a cooler that cools a dried product obtained by drying the wet raw material discharged from the discharge unit.

The fluidized bed drying facility can efficiently remove dust from the generated steam discharged from the fluidized bed drying device by adopting the above configuration.

Here, it is preferable that the fluidized bed drying device further includes a heating unit including a pipe disposed inside the fluidized bed of the drying container and a superheated medium supply device that supplies a superheated medium to the pipe. Thereby, a wet raw material can be dried more efficiently.

In addition, it is interposed downstream of the cooling trap in the generated steam line, guides the cooled generated steam to a region vertically above the fluidized bed inside the drying container, It is preferable to further comprise a superheating means for superheating with the generated steam inside. Thereby, the generated steam that has passed through the cooling trap can be heated to high temperature using heat in the apparatus system, and can be used for various applications.

In addition, it is interposed downstream of the cooling trap in the generated steam line, and the cooled generated steam is superheated by a superheating medium flowing through the piping in a region after passing through the inside of the fluidized bed of the heating means. It is preferable to further include an overheating means. Thereby, the generated steam that has passed through the cooling trap can be heated to high temperature using heat in the apparatus system, and can be used for various applications.

Further, it is preferable to further include a line for branching a part of the generated steam heated by the superheating means and supplying the fluidized gas as the fluidized gas to the fluidized gas supply unit. Thereby, the heat and steam generated in the apparatus system can be used efficiently.

Further, it is preferable to further include a heat recovery system that branches a part of the generated steam heated by the superheating means and recovers the heat of the generated steam. Thereby, the heat generated in the apparatus system can be used efficiently.

According to the fluidized bed drying apparatus of the present invention, since the fluidizing gas and the generated steam are introduced from the dry matter discharge part side to the wet raw material input part side and guided to the gas discharge part in the drying container, the guide device is provided. The particles of dry matter accompanying the fluidized gas and generated steam can be returned to the wet raw material input side to be mixed with the wet raw material, improving the drying efficiency of the wet raw material by promoting the heat drying of the wet raw material. can do.

According to the fluidized bed drying facility of the present invention, there is an effect that dust can be efficiently removed from the generated steam discharged from the fluidized bed drying apparatus.

FIG. 1 is a schematic configuration diagram of a coal gasification combined power generation facility to which a fluidized bed drying apparatus according to Embodiment 1 of the present invention is applied. FIG. 2 is a schematic side view of the fluidized bed drying apparatus according to the first embodiment. FIG. 3 is a schematic plan view of the fluidized bed drying apparatus according to the first embodiment. FIG. 4 is a schematic side view of a fluidized bed drying apparatus according to Embodiment 2 of the present invention. FIG. 5 is a schematic side view of a fluidized bed drying apparatus according to Example 3 of the present invention. FIG. 6 is a schematic side view of a fluidized bed drying apparatus according to Example 4 of the present invention. FIG. 7 is a schematic side view of a fluidized bed drying apparatus according to Embodiment 5 of the present invention. FIG. 8 is a schematic view showing an embodiment of a combined coal gasification combined power generation facility to which a fluidized bed drying facility according to Embodiment 6 of the present invention is applied. FIG. 9 is a schematic view showing a fluidized bed drying facility including the fluidized bed drying apparatus according to Example 6 shown in FIG. FIG. 10 is a schematic view showing a fluidized bed drying apparatus according to Example 6 shown in FIG. FIG. 11 is a schematic diagram illustrating a fluidized bed drying facility including the fluidized bed drying apparatus according to the seventh embodiment.

Hereinafter, preferred embodiments of a fluidized bed drying apparatus and a fluidized bed drying facility according to the present invention will be described 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 configuration diagram of a coal gasification combined power generation facility to which a fluidized bed drying apparatus according to Embodiment 1 of the present invention is applied. FIG. 2 is a schematic side view of the fluidized bed drying apparatus of Embodiment 1. FIG. These are the schematic plan views of the fluidized-bed drying apparatus of Example 1. FIG.

The combined coal gasification combined power generation facility (IGCC: Integrated Coal Gasification Combined Cycle) of Example 1 employs an air combustion method in which coal gas is generated in a gasification furnace using air as an oxidant, and is purified by a gas purification device. 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 raw material supplied to the gasifier.

In Example 1, as shown in FIG. 1, 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 produces pulverized coal by pulverizing the low-grade coal (dried coal) dried by the fluidized bed dryer 12 into fine particles. 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 this 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 the 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 collection device 15 has 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 absorbing solution. 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 has a turbine 69 connected to the rotating shaft 64 in the gas turbine facility 17, and the generator 19 is connected 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.

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

Here, the operation of the coal gasification combined cycle facility 10 of the first embodiment will be described.

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 gasification furnace 14 through the second nitrogen 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 gas purified 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 device 12 in the coal gasification combined power generation facility 10 described above will be described in detail.

2 and 3, the fluidized bed drying apparatus 12 includes a drying container 101, a raw coal charging port (wet raw material charging unit) 102, a dry coal discharging port (dry matter discharging unit) 103, and a fluidization It has a gas supply port (fluidized gas supply unit) 104, a gas discharge port (gas discharge unit) 105, and a heat transfer tube (heating unit) 106.

The drying container 101 has a hollow box shape, and is formed with a raw coal charging port 102 for charging raw coal on one end side, and on the other end side, dried charcoal for discharging a dried product obtained by heating and drying raw coal. A discharge port 103 is formed. Further, the drying container 101 is provided with a dispersion plate 107 having a plurality of openings at a predetermined distance from the bottom plate 101a at the lower portion, and fluidized gas (superheated steam) is supplied into the drying container 101 to the bottom plate 101a. A fluidizing gas supply port 104 is formed. Further, the drying container 101 is formed with a gas discharge port 105 for discharging the fluidized gas and the generated steam at the top. In this case, the drying container 101 is retained by the ceiling portion 101b being inclined upward toward the gas discharge port 105, and the fluidized gas and the generated steam flowing along the inclined ceiling portion 101b. It is comprised so that it may be guide | induced to the gas exhaust port 105, without.

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 port 104 through the dispersion plate 107, so that a predetermined thickness is provided above the dispersion plate 107. A fluidized bed S is formed, and a free board portion F is formed above the fluidized bed S. A heat transfer pipe 106 that circulates in the fluidized bed S from the outside through the drying container 101 is disposed, and the raw coal can be heated and dried by the superheated steam flowing in the heat transfer pipe 106.

In the drying container 101, fluidized gas is supplied from the fluidized gas supply port 104 to the fluidized bed S through the dispersion plate 107, and moisture contained therein is evaporated by drying the raw coal in the fluidized bed S. Steam is generated. The fluidized gas and generated steam are discharged from the gas outlet 105. In this embodiment, the fluidized gas and generated steam are introduced from the dry coal outlet 103 side to the raw coal inlet 102 side. An inclined plate (guide plate) 111, a collision plate 112, and a flow guide plate (partition plate) 113 are provided as guide devices that guide the gas discharge port 105.

The inclined plate 111 is inclined upward from the raw coal inlet 102 side toward the dry coal outlet 103 side at the free board portion F above the fluidized bed S, and the base end portion of the raw plate in the drying vessel 101 is inclined. While being arranged with a predetermined gap from the wall surface on the charcoal inlet 102 side, the tip portion is arranged with a predetermined gap from the wall surface on the dry charcoal discharge port 103 side in the drying container 101, and both side portions are not spaced from each wall surface in the drying container 101. Closely fixed. Therefore, the gap formed between the inclined plate 111 and the upper surface of the fluidized bed S is set so as to gradually increase from the raw coal input port 102 side toward the dry coal discharge port 103, and the fluidized gas The generated steam can be guided to the dry coal discharge port 103 side, and can be guided from the dry coal discharge port 103 side to the raw coal input port 102 side.

In the free board portion F, the collision plate 112 collides with the fluidized gas and the generated steam that are introduced from the dry coal discharge port 103 side to the raw coal input port 102 side above the inclined plate 111. It separates particles of dry matter that accompany the chemical gas and generated steam. Therefore, a plurality of collision plates 112 are provided between the ceiling portion 101 b of the drying container 101 and the inclined plate 111 in the free board portion F. The plurality of collision plates 112 are arranged along the substantially vertical direction so as to oppose the flow of fluidized gas and generated steam flowing from the dry coal discharge port 103 side to the raw coal input port 102 side, and the collision By arranging the plates 112 at a predetermined interval, a flow path is ensured so that the fluidized gas and the generated steam can meander and flow.

Further, the drying container 101 has a raw coal inlet 102 and a gas outlet 105 disposed on one end side, and a gas outlet 105 is disposed above the raw coal inlet 102. And the flow guide plate 113 is arrange | positioned so that the raw coal input port 102 and the gas exhaust port 105 may be partitioned off. That is, the flow guide plate 113 is inclined downward from the raw coal inlet 102 side toward the dry coal outlet 103 side in the free board portion F above the fluidized bed S, and the base end portion is a drying container. 101 is disposed with a predetermined gap with the wall surface on the raw coal inlet 102 side in 101, while the tip portion is disposed with a predetermined gap with the base end portion of the inclined plate 111, and both side portions are in close contact with each wall surface in the drying container 101 without a gap. Is fixed. In this case, the inclination angle of the flow guide plate 113 is substantially the same as the raw coal charging angle at the raw coal charging port 102. Therefore, the gap formed between the flow guide plate 113 and the upper surface of the fluidized bed S is set so as to gradually decrease from the raw coal input port 102 side toward the inclined plate 111 (dry coal discharge port 103). ing.

Here, the operation of the fluidized bed drying apparatus 12 of Example 1 will be described.

In the fluidized bed drying device 12, the raw coal is supplied from the raw coal inlet 102 to the drying container 101 and the fluidized gas is supplied from the fluidized gas supply port 104 through the dispersion plate 107. A fluidized bed S having a predetermined thickness is formed above the dispersion plate 107. 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 tube 106 at this time. In this case, the raw coal is heated and dried by the heat from the heat transfer pipe 106 while moving from the raw coal inlet 102 to the dry coal outlet 103, but immediately after being supplied from the raw coal inlet 102, that is, At a position below the flow guide plate 113, it is in a preheated state, and moisture hardly evaporates. After that, when the raw coal moves to the preheating region, that is, beyond the lower position of the flow guide plate 113 to the lower position of the inclined plate 111, the water evaporation starts, gradually increases and becomes maximum, and reaches the dry coal discharge port 103. As it approaches, moisture evaporation decreases.

The steam generated by heating and drying the raw coal in the fluidized bed S at a position below the inclined plate 111 rises together with the fluidizing gas, and flows toward the dry coal discharge port 103 along the lower surface of the inclined plate 111. . The fluidizing gas and the generated steam are detoured on the wall surface on the dry coal discharge port 103 side in the drying container 101 and flow in the space above the inclined plate 111 toward the raw coal input port 102. At this time, the fluidized gas and the generated steam collide with the plurality of collision plates 112, whereby the particles of dry coal accompanying the fluidized gas and the generated vapor are separated and fall on the inclined plate 111. Then, the dry coal particles descend toward the raw coal inlet 102 along the upper surface of the inclined plate 111, and fall into the fluidized bed S together with the raw coal before drying introduced from the raw coal inlet 102. Here, when the raw coal before drying and the particles of the dry coal are mixed in the fluidized bed S, drying of the raw coal before drying is promoted. Thereafter, the dry coal from which the raw coal has been dried is discharged to the outside from the dry coal discharge port 103, and the fluidized gas and the generated steam from which the dry coal particles are separated are guided by the flow guide plate 113 and flow upward. The gas 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 obtained by heating and drying the raw coal from the side, and a fluidized gas supply port 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. A gas outlet 105 for discharging fluidized gas and generated steam from above the raw coal inlet 102 on one end side of the drying vessel 101, a heat transfer tube 106 for heating the raw coal of the fluidized bed S, a fluidized gas and An inclined plate 111 is provided as a guide device that guides the generated steam from the dry coal discharge port 103 side to the raw coal input port 102 side and guides it to the gas discharge port 105.

Therefore, when raw coal is introduced into the drying container 101 from the raw coal inlet 102 and fluidized gas is supplied from the lower part of the drying container 101 through the dispersion plate 107 from the fluidized gas supply port 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, the fluidized gas and the generated steam are guided from the dry coal discharge port 103 side to the raw coal input port 102 side by the inclined plate 111 and guided to the gas discharge port 105. The dry coal particles accompanying the coal are separated from the fluidized gas and the generated steam, returned to the raw coal inlet 102 side, mixed with the raw coal before drying, and moved through the fluidized bed S again. It becomes possible to accelerate the heat drying of the raw coal introduced from the port 102, and the drying efficiency of the raw coal can be improved.

Further, in the fluidized bed drying apparatus of Example 1, the free board portion F above the fluidized bed S is provided with an inclined plate 111 that is inclined upward from the raw coal input port 102 side toward the dry coal discharge port 103 side. Yes. Accordingly, the fluidized gas and the generated steam flow along the lower surface of the inclined plate 111 toward the dry coal discharge port 103, and then flow over the inclined plate 111 toward the raw coal inlet 102. In addition, the generated steam can be introduced from the dry coal discharge port 103 side to the raw coal input port 102 side to be properly guided to the gas discharge port 105, and the dry coal particles accompanying the fluidized gas and the generated steam are inclined. The dried charcoal particles can be dropped onto the plate 111 and properly returned to the raw coal inlet 102 side along the upper surface of the inclined plate 111.

Moreover, in the fluidized bed drying apparatus of Example 1, the fluidized gas and the generated steam, which are introduced from the dry coal discharge port 103 side to the raw coal input port 102 side, collide with the upper side of the inclined plate 111 and are accompanied by the dry coal. A plurality of collision plates 112 are provided to separate the particles. Therefore, when the fluidized gas and the generated steam flow from the dry coal discharge port 103 side to the raw coal input port 102 side above the inclined plate 111, the particles of the accompanying dry coal are caused to collide with the plurality of collision plates 112. It will be separated properly and fall, and the separation performance of dry coal can be improved.

In this case, by providing a plurality of collision plates 112 for separating dry charcoal particles from fluidized gas and generated steam inside the dry container 101, a dust collector or the like is not required outside the dry container 101, and the load is reduced. It is possible to reduce the size and simplify the operation. As a result, the pressure loss of the system is reduced and the amount of heat recovered from the generated steam can be increased. And the generation | occurrence | production of the dew condensation concerned when isolate | separating the particle | grains of dry charcoal from the fluidization gas and generated vapor | steam outside the drying container 101 can be prevented.

Further, in the fluidized bed drying apparatus of the first embodiment, the flow guide plate 113 that partitions the raw coal charging port 102 and the gas discharging port 105 is provided in the free board part F above the fluidized bed S. Therefore, the raw coal inlet 102 and the gas outlet 105 are partitioned by the flow guide plate 113, so that the fluidized gas and generated steam introduced from the dry coal outlet 103 side to the raw coal inlet 102 side are supplied to the raw coal inlet. Exhaust from the charcoal inlet 102 is prevented, and fluidized gas and generated steam can be properly introduced.

In this case, the flow guide plate 113 is inclined downward from the raw coal inlet 102 side toward the dry coal outlet 103 side, and the base end portion has a predetermined gap from the wall surface on the raw coal inlet 102 side in the drying container 101. The distal end portion is disposed with a predetermined gap from the proximal end portion of the inclined plate 111. Therefore, the fluidized gas and the generated steam that are guided to the raw coal inlet 102 are appropriately guided to the gas outlet 105 by the inclined guide plate 113. Further, the dry charcoal particles separated from the fluidized gas and the generated steam slide down the inclined plate 111 and are reintroduced into the preheating region of the fluidized bed S from between the inclined plate 111 and the flow guide plate 113. It becomes possible to promote drying of undried raw coal. Further, by providing a gap between the flow guide plate 113 and the wall surface of the drying container 101, fluidized gas and generated steam are prevented from staying between the flow guide plate 113 and the wall surface of the drying container 101. The

FIG. 4 is a schematic side view of a fluidized bed drying apparatus according to Example 2 of the present invention. In addition, the same code | symbol is attached | subjected to the member which has the function similar to the Example mentioned above, and detailed description is abbreviate | omitted.

In Example 2, as shown in FIG. 4, the fluidized bed drying apparatus 12 includes a drying container 101, a raw coal inlet 102, a dry coal outlet 103, a fluidized gas supply port 104, and a gas outlet 105. And a heat transfer tube 106.

Further, the drying container 101 includes an inclined belt 121 as a guide device that guides the fluidized gas and generated steam from the dry coal discharge port 103 side to the raw coal input port 102 side and guides them to the gas discharge port 105, and a collision plate 112. And the flow guide plate 113 is provided. The inclined belt 121 is configured by an endless conveying belt wound between a driving roller and a driven roller. The inclined belt 121 functions not only as an inclined plate, but also with dry charcoal particles dropped by a plurality of collision plates 112. It has a function as a transfer device for transferring to the raw coal input port 102 side. Therefore, the gap formed between the inclined belt 121 and the upper surface of the fluidized bed S is set so as to gradually increase from the raw coal input port 102 toward the dry coal discharge port 103, and the fluidized gas The generated steam can be guided to the dry coal discharge port 103 side, and can be guided from the dry coal discharge port 103 to the raw coal input port 102 side.

The inclined belt 121 is disposed in the free board portion F above the fluidized bed S so as to be inclined upward from the raw coal input port 102 side toward the dry coal discharge port 103 side. While the tip of the flow guide plate 113 is arranged with a predetermined gap, the tip is arranged with a predetermined gap from the wall on the dry charcoal discharge port 103 side of the drying container 101, and the driving roller and the driven roller are each wall surface of the drying container 101. Is supported rotatably. Therefore, the inclined belt 121 operates in the direction of the arrow shown in FIG. 4, so that the dry coal particles dropped on the upper surface can be conveyed to the raw coal inlet 102 side.

Accordingly, the raw coal is supplied to the drying container 101 from the raw coal inlet 102 and the fluidizing gas is supplied from the fluidizing gas supply port 104 through the dispersion plate 107, so that A fluidized bed S having a predetermined thickness is formed. 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 tube 106 at this time. In this case, the raw coal is heated and dried by the heat from the heat transfer pipe 106 while moving from the raw coal inlet 102 to the dry coal outlet 103, but immediately after being supplied from the raw coal inlet 102, that is, At a position below the flow guide plate 113, it is in a preheated state, and moisture hardly evaporates. After that, when the raw coal moves to the preheating region, that is, the lower position of the flow guide plate 113 and moves to the lower position of the inclined belt 121, the water evaporation starts, gradually increases and becomes maximum, and reaches the dry coal discharge port 103. As it approaches, moisture evaporation decreases.

Then, the steam generated by heating and drying the raw coal in the fluidized bed S at a position below the inclined belt 121 rises together with the fluidizing gas and flows to the dry coal discharge port 103 side along the lower surface of the inclined belt 121. . The fluidized gas and the generated steam are detoured on the wall surface of the drying container 101 on the dry coal discharge port 103 side, and flow in the space above the inclined belt 121 to the raw coal input port 102 side. At this time, the fluidized gas and the generated steam collide with the plurality of collision plates 112, whereby the particles of the dry coal accompanying the fluidized gas and the generated steam are separated and fall on the inclined belt 121. Then, the dry coal particles are moved to the raw coal charging port 102 side by the driven inclined belt 121 and fall into the fluidized bed S together with the raw coal before drying supplied from the raw coal charging port 102. Here, when the raw coal before drying and the particles of the dry coal are mixed in the fluidized bed S, drying of the raw coal before drying is promoted. Thereafter, the dry coal from which the raw coal has been dried is discharged to the outside from the dry coal discharge port 103, and the fluidized gas and the generated steam from which the dry coal particles are separated are guided by the flow guide plate 113 and flow upward. The gas is discharged from the gas discharge port 105 to the outside.

As described above, in the fluidized bed drying apparatus of the second embodiment, the fluidizing gas and the generated steam are introduced into the drying vessel 101 from the dry coal discharge port 103 side to the raw coal input port 102 side, and the gas discharge port. An inclined belt 121 that functions as a guide device that leads to 105 and a conveying device that conveys the particles of the dried dry coal to the raw coal charging port 102 side is provided.

Accordingly, the fluidized gas and the generated steam rising from the fluidized bed S are guided from the dry coal discharge port 103 side to the raw coal input port 102 side by the inclined belt 121 and are guided to the gas discharge port 105. The dry coal particles accompanying the gasified gas and generated steam are separated from the fluidized gas and generated steam, returned to the raw coal inlet 102 side, mixed with the raw coal before drying, and moved through the fluidized bed S again. Thus, it becomes possible to promote the heat drying of the raw coal input from the raw coal input port 102, and the drying efficiency of the raw coal can be improved.

Further, when the fluidized gas and the generated steam flow over the inclined belt 121 and collide with the plurality of collision plates 112, the accompanying dry coal particles are separated and fall on the inclined belt 121, and this dry coal is driven. Is transported to the raw coal charging port 102 side by the inclined belt 121 to be introduced into the preheating region of the fluidized bed S, and drying can be promoted by properly mixing this dry coal with the raw coal before drying. .

FIG. 5 is a schematic side view of a fluidized bed drying apparatus according to Example 3 of the present invention. In addition, the same code | symbol is attached | subjected to the member which has the function similar to the Example mentioned above, and detailed description is abbreviate | omitted.

In Example 3, as shown in FIG. 5, the fluidized bed drying apparatus 12 includes a drying container 101, a raw coal inlet 102, a dry coal outlet 103, a fluidized gas supply port 104, and a gas outlet 105. And a heat transfer tube 106.

In addition, the drying container 101 includes an inclined head 131, a collision plate 112, a guide device that guides the fluidized gas and generated steam from the dry coal discharge port 103 side to the raw coal input port 102 side and guides them to the gas discharge port 105. A flow guide plate 113 is provided. The inclined head 131 has a hollow shape and can supply superheated steam inside, and has a plurality of injection nozzles 131a mounted on the upper surface portion, and not only functions as an inclined plate but also a plurality of collisions. It has a function as a transport device that transports dry charcoal particles dropped by the plate 112 to the raw coal inlet 102 side. Therefore, the gap formed between the inclined head 131 and the upper surface of the fluidized bed S is set so as to gradually increase from the raw coal inlet 102 side toward the dry coal outlet 103, and the fluidized gas The generated steam can be guided to the dry coal discharge port 103 side, and can be guided from the dry coal discharge port 103 to the raw coal input port 102 side.

In addition, the inclined head 131 is disposed at the free board portion F above the fluidized bed S so as to be inclined upward from the raw coal input port 102 side toward the dry coal discharge port 103 side. Is disposed with a predetermined gap from the tip of the flow guide plate 113, while the tip is disposed with a predetermined gap from the wall on the drying coal discharge port 103 side in the drying vessel 101, and both side portions are arranged on each wall of the drying vessel 101. It is fixed. In the inclined head 131, each injection nozzle 131a can inject superheated steam toward the raw coal inlet 102 side. Therefore, the inclined head 131 can convey the dry coal particles falling on the upper surface to the raw coal inlet 102 side by injecting superheated steam from each injection nozzle 131a in the direction of the arrow shown in FIG.

Accordingly, the raw coal is supplied to the drying container 101 from the raw coal inlet 102 and the fluidizing gas is supplied from the fluidizing gas supply port 104 through the dispersion plate 107, so that A fluidized bed S having a predetermined thickness is formed. 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 tube 106 at this time. In this case, the raw coal is heated and dried by the heat from the heat transfer pipe 106 while moving from the raw coal inlet 102 to the dry coal outlet 103, but immediately after being supplied from the raw coal inlet 102, that is, At a position below the flow guide plate 113, it is in a preheated state, and moisture hardly evaporates. After that, when the raw coal moves to the preheating region, that is, the lower position of the flow guide plate 113 and moves to the lower position of the inclined head 131, the water evaporation starts, gradually increases and becomes maximum, and reaches the dry coal discharge port 103. As it approaches, moisture evaporation decreases.

Then, the steam generated by heating and drying the raw coal in the fluidized bed S at a position below the inclined head 131 rises together with the fluidizing gas and flows to the dry coal discharge port 103 side along the lower surface of the inclined head 131. . The fluidized gas and the generated steam are detoured on the wall surface on the dry coal discharge port 103 side in the drying container 101 and flow in the space above the inclined head 131 toward the raw coal input port 102. At this time, the fluidized gas and the generated steam collide with the plurality of collision plates 112, whereby the particles of the dry coal accompanying the fluidized gas and the generated steam are separated and fall on the inclined head 131. Then, the dry coal particles are blown off to the raw coal charging port 102 side by the superheated steam injected from each injection nozzle 131a and fall into the fluidized bed S together with the raw coal before drying supplied from the raw coal charging port 102. To do. Here, when the raw coal before drying and the particles of the dry coal are mixed in the fluidized bed S, drying of the raw coal before drying is promoted. Thereafter, the dry coal from which the raw coal has been dried is discharged to the outside from the dry coal discharge port 103, and the fluidized gas and the generated steam from which the dry coal particles are separated are guided by the flow guide plate 113 and flow upward. The gas is discharged from the gas discharge port 105 to the outside.

As described above, in the fluidized bed drying apparatus of the third embodiment, the fluidized gas and the generated steam are introduced into the drying vessel 101 from the dry coal discharge port 103 side to the raw coal input port 102 side, and the gas discharge port. An inclined head 131 that functions as a guide device that leads to 105 and a conveying device that conveys the particles of the dry coal that has fallen to the raw coal charging port 102 side is provided.

Accordingly, the fluidized gas and the generated steam rising from the fluidized bed S are guided from the dry coal discharge port 103 side to the raw coal input port 102 side by the inclined head 131 and are guided to the gas discharge port 105. The dry coal particles accompanying the gasified gas and generated steam are separated from the fluidized gas and generated steam, returned to the raw coal inlet 102 side, mixed with the raw coal before drying, and moved through the fluidized bed S again. Thus, it becomes possible to promote the heat drying of the raw coal input from the raw coal input port 102, and the drying efficiency of the raw coal can be improved.

Further, when the fluidized gas and the generated steam flow over the inclined head 131 and collide with the plurality of collision plates 112, the accompanying dry charcoal particles are separated and fall on the inclined head 131. The superheated steam injected from the injection nozzle 131a is transported to the raw coal input port 102 side and supplied to the preheating region of the fluidized bed S. This dry coal is appropriately mixed with the raw coal before drying and dried. Can be promoted.

In the second and third embodiments described above, the inclined head 131 having the inclined belt 121 and the injection nozzle 131a is provided as the conveying device, but the present invention is not limited to this configuration. For example, a vibrator may be provided on the inclined plate, and the inclined plate may be vibrated to convey dry charcoal particles. Further, a scraping member may be movably provided on the inclined plate.

FIG. 6 is a schematic side view of a fluidized bed drying apparatus according to Example 4 of the present invention. In addition, the same code | symbol is attached | subjected to the member which has the function similar to the Example mentioned above, and detailed description is abbreviate | omitted.

In Example 4, as shown in FIG. 6, the fluidized bed drying apparatus 12 </ b> A includes a drying container 201, a raw coal charging port (wet raw material charging unit) 202, a dry coal discharging port (dry matter discharging unit) 203, A fluidized gas supply port (fluidized gas supply unit) 204, a gas discharge port (gas discharge unit) 205, and a heat transfer tube (heating unit) 206 are provided.

The drying container 201 has a hollow box shape, and is formed with a raw coal charging port 202 for charging raw coal on one end side, and on the other end side, dried charcoal for discharging a dried product obtained by heating and drying raw coal. A discharge port 203 is formed. Further, the drying container 201 is provided with a dispersion plate 207 having a plurality of openings at a predetermined distance from the bottom plate 201a at the lower portion, and supplies fluidized gas (superheated steam) into the drying container 201 to the bottom plate 201a. A fluidizing gas supply port 204 is formed. Further, the drying container 201 is formed with a gas discharge port 205 for discharging the fluidized gas and the generated steam at the top. In this case, in the drying container 201, the ceiling 201b is inclined upward from the dry matter discharge port 203 toward the gas discharge port 205, and the fluidized gas and the generated vapor flow along the inclined ceiling 201b. Therefore, it is configured to be guided to the gas discharge port 205 without staying.

The drying container 201 is supplied with raw coal from the raw coal inlet 202 and fluidized gas is supplied from the fluidized gas supply port 204 through the dispersion plate 207, so that a predetermined thickness is provided above the dispersion plate 207. A fluidized bed S is formed, and a free board portion F is formed above the fluidized bed S. And the heat transfer pipe | tube 206 which penetrates the drying container 201 from the exterior and circulates the inside of the fluidized bed S is arrange | positioned, and raw coal can be heated and dried with the superheated steam which flows through this heat transfer pipe | tube 206 inside.

In the drying container 201, fluidized gas is supplied from the fluidized gas supply port 204 to the fluidized bed S through the dispersion plate 207, and moisture contained therein is evaporated by drying the raw coal in the fluidized bed S. Steam is generated. The fluidized gas and generated steam are discharged from the gas outlet 205. In this embodiment, the fluidized gas and generated steam are introduced from the dry matter outlet 203 side to the raw coal inlet 202 side. A collision plate 212 and a flow guide plate (partition plate) 213 are provided as a guide device that leads to the gas discharge port 205.

The collision plate 212 collides with the fluidized gas and generated steam introduced from the dry matter discharge port 203 side to the raw coal input port 202 side at the upper part of the free board portion F, so that the fluidized gas and generated steam are collided. The particles of dry matter accompanying the slab are separated. For this reason, the collision plate group 214 is formed by providing a plurality of collision plates 212 at the upper part of the free board portion F and below the ceiling portion 201b of the drying container 201. The collision plate group 214 is arranged along the substantially vertical direction so as to face the flow of fluidized gas and generated steam flowing from the dry matter discharge port 203 side to the raw coal input port 202 side, and the collision plate By arranging 212 at a predetermined interval, a flow path is ensured so that fluidized gas and generated steam can meander and flow.

Also, the collision plate group 214 functions to guide the fluidized gas and generated steam in the drying container 201 from the dry matter discharge port 203 side to the raw coal input port 202 side. That is, the collision plate group 214 is disposed at a position where the lower end is inclined upward from the raw coal input port 202 side toward the dry coal discharge port 203 side. That is, the lower end of the collision plate group 214 is arranged so as to draw a virtual inclined surface L that is inclined upward from the raw coal input port 202 side toward the dry matter discharge port 203 side. Therefore, the gap formed between the virtual inclined surface L and the upper surface of the fluidized bed S is set so as to gradually increase from the raw coal input port 202 side toward the dry matter discharge port 203. The conversion gas and the generated steam can be led to the dry matter discharge port 203 side, and can be led from the dry matter discharge port 203 to the raw coal charging port 202 side.

Further, the drying container 201 has a raw coal inlet 202 and a gas outlet 205 arranged on one end side, and a gas outlet 205 is arranged above the raw coal inlet 202. And the flow guide plate 213 is arrange | positioned so that the raw coal input port 202 and the gas exhaust port 205 may be partitioned off. That is, the flow guide plate 213 is inclined downward in the free board portion F above the fluidized bed S from the raw coal input port 202 side toward the dry matter discharge port 203 side, and the base end portion is a drying container. 201 is disposed with a predetermined gap from the wall surface on the raw coal inlet 202 side in 201, while the front end portion is disposed with a predetermined gap from the lower end portion of the collision plate 212, and both side portions are in close contact with each wall surface in the drying container 201 without a gap. It is fixed.

Accordingly, the raw coal is supplied to the drying container 201 from the raw coal inlet 202 and the fluidizing gas is supplied from the fluidizing gas supply port 204 through the dispersion plate 207, so that A fluidized bed S having a predetermined thickness is formed. The raw coal moves through the fluidized bed S to the dry matter discharge port 203 side by the fluidized gas, and is heated and dried by receiving heat from the heat transfer tube 206 at this time. In this case, the raw coal is heated and dried by the heat from the heat transfer pipe 206 while moving from the raw coal inlet 202 to the dry matter outlet 203, that is, immediately after being supplied from the raw coal inlet 202, that is, At a position below the flow guide plate 213, it is in a preheated state, and moisture hardly evaporates. After that, when the raw coal moves beyond the preheating region, that is, the lower position of the flow guide plate 213, the water evaporation starts, gradually increases to the maximum, and the water evaporation decreases as the dry matter discharge port 203 is approached. .

Then, the steam generated by heating and drying the raw coal in the fluidized bed S at the lower position of the collision plate group 214 rises together with the fluidized gas and flows to the dry matter discharge port 203 side by the collision plate group 214. Then, the fluidized gas and the generated steam flow around the wall on the dry matter discharge port 203 side in the drying container 201 and flow toward the raw coal input port 202 side. At this time, the fluidized gas and the generated steam collide with the plurality of collision plates 212, whereby the particles of dry coal accompanying the fluidized gas and the generated steam are separated and fall into the fluidized bed S. Here, when the raw coal before drying and the particles of the dry coal are mixed in the fluidized bed S, drying of the raw coal before drying is promoted. Thereafter, the dry coal from which the raw coal has been dried is discharged to the outside from the dry matter discharge port 203, and the fluidized gas and the generated steam from which the dry coal particles are separated are guided by the flow guide plate 213 and flow upward. The gas is discharged from the gas discharge port 205 to the outside.

Thus, in the fluidized bed drying apparatus of Example 4, the drying container 201 having a hollow shape, the raw coal charging port 202 for charging raw coal into one end side of the drying container 201, and the other end of the drying container 201 are provided. A dry coal discharge port 203 for discharging dry coal obtained by heating and drying the raw coal from the side, and a fluidized gas supply port 204 for forming a fluidized bed S together with the raw coal by supplying a fluidizing gas to the lower part of the drying vessel 201; The gas outlet 205 for discharging fluidized gas and generated steam from above the raw coal inlet 202 on one end side of the drying vessel 201, the heat transfer pipe 206 for heating the raw coal of the fluidized bed S, the fluidized gas and generated A collision plate 212 is provided as a guide device that guides the steam from the dry coal discharge port 203 side to the raw coal input port 202 side and guides it to the gas discharge port 205.

Therefore, the fluidized gas and generated steam rising from the fluidized bed S are led from the dry coal discharge port 203 side to the raw coal input port 202 side by the collision plate group 214 and are guided to the gas discharge port 205. The particles of the dry coal accompanying the fluidized gas and the generated steam are separated from the fluidized gas and the generated steam, returned to the raw coal inlet 202 side, mixed with the raw coal before drying, and moved through the fluidized bed S again. In other words, it becomes possible to accelerate the heat drying of the raw coal input from the raw coal input port 202, and the drying efficiency of the raw coal can be improved.

Further, in the fluidized bed drying apparatus of the fourth embodiment, the collision plate group 214 is opposed to the flow direction of the fluidized gas and the generated steam, and a plurality of predetermined intervals are arranged in the same direction. Is disposed at a position inclined upward from the raw coal input port 202 side toward the dry coal discharge port 203 side. Accordingly, the lower end of the collision plate group 214 is arranged so as to draw a virtual inclined surface L that is inclined upward from the raw coal input port 202 side toward the dry matter discharge port 203 side, so that fluidized gas and generated steam are generated. After flowing to the dry coal discharge port 203 side, it flows to the raw coal input port 202 side, and this fluidized gas and generated steam can be properly introduced and led to the gas discharge port 205.

FIG. 7 is a schematic side view of a fluidized bed drying apparatus according to Example 5 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 5, as shown in FIG. 7, the fluidized bed drying apparatus 12 </ b> A includes a drying container 201, a raw coal inlet 202, a dry coal outlet 203, a fluidized gas supply port 204, and a gas outlet 205. And a heat transfer tube 206.

Further, the drying container 201 includes a collision plate 222 as a guide device that guides the fluidized gas and generated steam from the dry matter discharge port 203 side to the raw coal input port 202 side and guides them to the gas discharge port 205, and a flow guide plate. 213 is provided.

The collision plate 222 collides with the fluidized gas and the generated steam that are introduced from the dry matter discharge port 203 side to the raw coal input port 202 side at the upper part of the free board portion F, so that the fluidized gas and the generated steam are collided. The particles of dry matter accompanying the slab are separated. Therefore, in the upper part of the free board part F, the collision board group 224 is formed by being provided below the ceiling part 201b of the drying container 201 and providing the plurality of collision boards 222. The collision plate group 224 is disposed at a predetermined angle so as to face the flow of fluidized gas and generated steam flowing from the dry matter discharge port 203 side to the raw coal input port 202 side, and the collision plate 222. By arranging them at a predetermined interval, a flow path is ensured so that the fluidized gas and the generated steam can meander and flow. In this case, each collision plate 222 has an inclination angle such that the lower end faces the raw coal inlet 202 side.

Also, the collision plate group 224 functions to guide the fluidized gas and generated steam in the drying container 201 from the dry matter discharge port 203 side to the raw coal input port 202 side. That is, the collision plate group 224 is disposed at a position where the lower end is inclined upward from the raw coal inlet 202 side toward the dry coal outlet 203 side. That is, the lower end of the collision plate group 224 is disposed so as to draw a virtual inclined surface L that is inclined upward from the raw coal input port 202 side toward the dry matter discharge port 203 side.

Then, the steam generated by heating and drying the raw coal in the fluidized bed S at a position below the collision plate group 224 rises together with the fluidized gas, and is dried according to the inclination angle of the plurality of collision plates 222, particularly the collision plates 222. It flows to the object discharge port 203 side. Then, the fluidized gas and the generated steam flow around the wall on the dry matter discharge port 203 side in the drying container 201 and flow toward the raw coal input port 202 side. At this time, the fluidized gas and the generated steam collide with the plurality of collision plates 222, whereby the particles of the dry coal accompanying the fluidized gas and the generated steam are separated and fall into the fluidized bed S. Here, when the raw coal before drying and the particles of the dry coal are mixed in the fluidized bed S, drying of the raw coal before drying is promoted. Thereafter, the dry coal from which the raw coal has been dried is discharged to the outside from the dry matter discharge port 203, and the fluidized gas and the generated steam from which the dry coal particles are separated are guided by the flow guide plate 213 and flow upward. The gas is discharged from the gas discharge port 205 to the outside.

As described above, in the fluidized bed drying apparatus of Example 5, the fluidized gas and the generated steam are introduced into the drying vessel 201 from the dry coal discharge port 203 side to the raw coal input port 202 side, and the gas discharge port. A collision plate 222 is provided as a guide device leading to 205, and the collision plate 222 is inclined so that the lower end faces the raw coal inlet 202 side.

Therefore, the fluidized gas and generated steam rising from the fluidized bed S are guided from the dry coal discharge port 203 side to the raw coal input port 202 side by the plurality of collision plates 222 and guided to the gas discharge port 205. The particles of the dry coal accompanying the fluidized gas and the generated steam are separated from the fluidized gas and the generated steam, returned to the raw coal inlet 202 side, mixed with the raw coal before drying, and moved through the fluidized bed S again. Thus, it becomes possible to promote the heat drying of the raw coal input from the raw coal input port 202, and the drying efficiency of the raw coal can be improved.

In the fifth embodiment, the lower end of the collision plate group 224 is disposed at a position inclined upward from the raw coal charging port 202 side toward the dry coal discharge port 203 side, and each lower side of each collision plate 222 is the original. Although it inclined so that it might face the charcoal inlet 202 side, it can function as a guide apparatus only by inclining each collision board 222 so that a lower end may face the raw coal inlet 202 side.

In Examples 4 and 5 described above, since the gas outlet 205 is disposed above the raw coal inlet 202, the lower part of the gas outlet 205 is in a negative pressure state due to the chimney effect of the gas outlet 205. As a result, the fluidized gas and generated steam rising from the fluidized bed S are guided from the dry coal discharge port 203 side to the raw coal input port 202 side and are easily guided to the gas discharge port 205. In this case, the flow guide plate 213 also functions as a guide device together with the

collision plates

212 and 222.

In each of the above-described embodiments, the inclined plate 111, the inclined belt 121, the inclined head 131, the

collision plates

112, 212, 222, and the

flow guide plates

113, 213 are provided as the guide device of the present invention. Heating may be performed to prevent particle adhesion and condensation of fluidized gas and generated steam. In this case, an electric heater, a heat transfer tube through which superheated steam flows, or the like may be used.

Moreover, in each Example mentioned above, although low grade coal was used as a wet raw material, it is applicable even if it is high grade coal, and it is not limited to coal, but can be used as a renewable biologically derived organic resource. 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. .

Next, an example (Example 6) of a fluidized bed drying facility equipped with a fluidized bed drying apparatus will be described with reference to FIGS. In Example 6, an example in which the fluidized-bed drying facility according to the present invention is applied to a coal gasification combined power generation facility (coal gasification combined power generation system) will be described. It is not limited. For example, as a power generation system using product charcoal dried in a fluidized bed drying facility, product charcoal dried in a fluidized bed drying facility is supplied to a boiler furnace, a steam turbine is driven by steam generated in the boiler furnace, and a generator is used. It can also be used in a power generation system using a brown coal fired boiler that obtains output. Even when the present invention is applied to a coal gasification combined power generation facility, the method is not limited. In this embodiment, the case where lignite is used as a wet raw material (substance to be dried) is described. However, any material having a high water content may be used, and low-grade coal including sub-bituminous coal, sludge, etc. may be used. it can.

FIG. 8 is a schematic view showing an embodiment of a combined coal gasification combined power generation facility to which a fluidized bed drying facility according to Embodiment 6 of the present invention is applied. FIG. 9 is a schematic view showing a fluidized bed drying facility including the fluidized bed drying apparatus according to Example 6 shown in FIG.

As shown in FIG. 8, an integrated coal gasification combined cycle (IGCC) facility 310 includes a fluidized-bed drying facility 400 that dries lignite 432 as fuel to produce product coal 440, and product coal 440. A mill 320 that is pulverized into pulverized coal 340, a coal gasification furnace 313 that processes pulverized coal 340 and converts it into gasified gas 342, and a gas turbine (GT) 314 that is operated using the gasified gas 342 as fuel. A heat recovery steam generator (HRSG) 316 that introduces turbine exhaust gas 346 from the gas turbine 314, a steam turbine (ST) 318 that is operated by the steam 348 generated by the exhaust heat recovery boiler 316, Gas turbine 314 And / or a generator (G) 319 coupled to the steam turbine 318. In addition, the coal gasification combined power generation facility 310 is connected to the condenser 334 that condenses the steam discharged from the steam turbine 318 and returns the steam to the exhaust heat recovery boiler 316, and is connected to the gas turbine 314 and rotates together with the gas turbine 314. , The air is separated into nitrogen (N ₂ ) and oxygen (O ₂ ), the separated oxygen is supplied to a pipe through which the air compressed by the compressor 336 flows, and nitrogen is supplied from the mill 320. An air separation device (ASU) 338 that supplies the transport path of the pulverized coal 340 transported to the coal gasification furnace 313. Note that the air 354 compressed by the compressor 336 is supplied to the coal gasifier 313 and the combustor 326.

In this coal gasification combined cycle power generation facility 310, the lignite 432 is dried by the fluidized bed drying facility 400 to produce the product coal 440, and the pulverized coal 340 obtained by pulverizing the product coal 440 by the mill 320 is gasified by the coal gasification furnace 313. The gasified gas 342 which is a product gas is obtained. The coal gasification combined power generation facility 310 removes dust and gas purifies the gasified gas 342 with the cyclone 322 and the gas purifier 324, and then supplies the gasified gas 342 to the combustor 326 of the gas turbine 314 as a power generation means, where it is burned and heated Generate high-pressure combustion gas 350. The coal gasification combined power generation facility 310 drives the gas turbine 314 with the combustion gas 350. In the coal gasification combined power generation facility 310, a gas turbine 314 is connected to a generator 319, and the generator 319 generates electric power by driving the gas turbine 314. Here, the turbine exhaust gas 346 after driving the gas turbine 314 still has a temperature of about 500 to 600 ° C. The coal gasification combined cycle power generation facility 310 sends the turbine exhaust gas 346 to the exhaust heat recovery boiler (HRSG) 316, and the exhaust heat recovery boiler (HRSG) 316 recovers the thermal energy of the turbine exhaust gas 346. The coal gasification combined cycle power generation facility 310 generates steam 348 by heat energy recovered from the turbine exhaust gas 346 by an exhaust heat recovery boiler (HRSG) 316, and drives the steam turbine 318 by the steam 348. The coal gasification combined cycle power generation facility 310 removes NOx and SOx components from the exhaust gas 352, which is the gas from which the thermal energy is recovered from the turbine exhaust gas 346 by the exhaust heat recovery boiler (HRSG) 316, and then removes the NOx and SOx components by the gas purification device 330. Through the atmosphere.

Hereinafter, the fluidized bed drying facility 400 will be described with reference to FIG. As shown in FIG. 9, the fluidized bed drying facility 400 includes a supply hopper 401 that supplies lignite 432 having a high moisture content, which is one of wet raw materials, and fluidized bed drying that dries the supplied lignite 432. A cooling trap 403 that cools the apparatus 402, the generated steam 434 discharged from the fluidized bed drying apparatus 402, removes dust in the generated steam 434, and superheating means 404 that superheats the generated steam 435a cooled by the cooling trap 403. A branching unit 405 that branches the generated steam 435b heated by the superheating means 404, a cooler 410 that cools the dried lignite 438 extracted from the fluidized bed drying apparatus 402 to produce product coal 440, and a branching unit 405. Recovery system 411 for recovering the heat of generated steam 435b, and generated steam 4 for which heat has been recovered by heat recovery system 411 Comprising a water treatment unit 412 that processes the 5b discharged as waste water 442, a circulator 414 supplies to the fluidized bed dryer 402 as a fluidizing steam 436 circulate generating steam 435b branched by the branching unit 405, a.

In addition, the fluidized bed drying facility 400 serves as a pipe connecting the parts, and a generated steam line L ₁ that discharges generated steam 434 generated when drying the lignite 432 to the outside of the fluidized bed drying apparatus 402 and guides it to the branching section 405. When a line branched by the branching unit 405, a line L ₂ to be supplied to the fluidized bed dryer 402 as a fluidizing steam (fluidizing gas) 436, produced by cooling the dried brown coal 438 in condenser 410 It includes a product line _{L 3} for discharging the product coal 440, a.

The supply hopper 401 is a facility for storing lignite 432. The supply hopper 401 supplies the stored lignite 432 into the fluidized bed drying device 402.

The fluidized bed drying apparatus 402 forms a fluidized bed with the lignite 432 supplied from the supply hopper 401 and the fluidized steam 436, moves the lignite 432, heats it with heating means, and dries the lignite 432 to dry lignite 438. And In the fluidized bed drying apparatus 402, fluidized steam 436 and steam generated when drying the lignite 432 are mixed to generate generated steam 434. The fluidized bed drying apparatus 402 includes a heat transfer member 428 as a heating means provided therein, a superheated steam supply device (high temperature gas supply means) 429 capable of supplying superheated steam (high temperature gas) A to the heat transfer member 428, and .

Next, the fluidized bed drying apparatus 402 will be described with reference to FIG. Here, FIG. 10 is a schematic view showing a fluidized bed drying apparatus according to Example 6 shown in FIG. 10 shows a schematic configuration of the cooling trap 403 and the superheating means 404 in addition to the fluidized bed drying apparatus 402.

The fluidized bed drying apparatus 402 includes a drying container 420 into which the lignite 432 is introduced, an input unit (input port) 422 into which the lignite 432 is input, and a discharge unit that discharges the dry lignite 438 obtained by drying the lignite 432 ( 423, a gas dispersion plate 424 provided inside the drying container 420, a fluidized gas supply unit (fluidized gas supply port) 426 that supplies the fluidized steam 436 to the drying container 420, and generated steam 434. And a steam discharge part (steam discharge port) 427 for discharging the steam. In addition, as described above, the fluidized bed drying apparatus 402 includes a heat transfer member 428 as a heating unit provided inside, and a superheated steam supply device (a high-temperature gas) A that can supply superheated steam (high-temperature gas) A to the heat transfer member 428 ( High temperature gas supply means) 429 (see FIG. 9).

The drying container 420 is divided into a drying chamber 450 located on the upper side in the vertical direction (upper side in the drawing) and a chamber chamber 452 located on the lower side in the vertical direction (lower side in the drawing) by the gas dispersion plate 424. Yes. The drying chamber 450 is a region to which lignite 432 is supplied, and the chamber chamber 452 is a region to which fluidized steam (fluidized gas) 436 is supplied. In the drying container 420, the fluidized vapor 436 supplied to the chamber chamber 452 passes through the gas dispersion plate 424 and is supplied to the drying chamber 450. In the drying chamber 450, the fluidized bed 455 is formed by the lignite 432 being moved by the fluidized steam 436.

The charging unit 422 is connected to one end of the drying chamber 450 of the drying container 420. The input unit 422 is connected to the supply hopper 401 and inputs the lignite 432 supplied from the supply hopper 401 into the drying chamber 450 at one end. The discharge part 423 is connected to the lower side in the vertical direction of the other end of the drying chamber 450 of the drying container 420, that is, in the vicinity of the gas dispersion plate 424. The discharge unit 423 is connected to a pipe connected to the cooler 410, and discharges the dried lignite 438 in the drying chamber 450 to the pipe.

The gas dispersion plate 424 has a large number of through holes 424a. The gas dispersion plate 424 makes the gas flowable between the drying chamber 450 and the chamber chamber 452 while suppressing the lignite 432 in the drying chamber 450 from falling into the chamber chamber 452. The fluidizing gas supply unit 426 is connected to the chamber chamber 452 and supplies the fluidizing vapor 436 supplied from the line L ₂ into the chamber chamber 452. The steam discharge unit 427 is connected to the upper surface of the drying chamber 450. Steam discharge portion 427 guides the steam generated 434 in the drying vessel 420 to generate steam line _{L 1.}

Here, the fluidized bed drying apparatus 402 is provided with a plurality of dividing plates 454 arranged in the drying chamber 450 in this embodiment. In this embodiment, the number of divided plates is four. However, the number is not limited to this, and the number of divided plates is the most suitable. The dividing plate 454 is a plate extending in the width direction and the vertical direction of the drying container 420, and a surface orthogonal to a line connecting the input unit 422 and the discharge unit 423 is a front surface (surface having the largest area). It is. As shown in FIG. 10, the dividing plate 454 has a lower end in the vertical direction in contact with the gas dispersion plate 424, and an upper end in the vertical direction is located below the upper end of the fluidized bed 455. Further, the dividing plate 454 is disposed in the entire drying chamber 450. The plurality of divided plates 454 are arranged at a predetermined interval in the direction from the input unit 422 to the discharge unit 423. Accordingly, the fluidized bed drying apparatus 402 is divided into a plurality of drying

compartments

450a, 450b, 450c, 450d, and 450e in the direction from the input unit 422 to the discharge unit 423 in the drying chamber 450 of the drying container 420 by the plurality of dividing plates 454. Divided. The drying compartments 450a, 450b, 450c, 450d, and 450e are arranged in the order of the drying compartment 450a, the drying compartment 450b, the drying compartment 450c, the drying compartment 450d, and the drying compartment 450e from the input unit 422 to the discharge unit 423. ing. The chamber chamber 452 is also divided into five

chamber chambers

452a, 452b, 452c, 452d, and 452e corresponding to the drying

chambers

450a, 450b, 450c, 450d, and 450e.

Five fluidizing gas supply units 426 are provided corresponding to the

chamber compartments

452a, 452b, 452c, 452d, and 452e, and fluidized steam 436 is provided in each of the

chamber compartments

452a, 452b, 452c, 452d, and 452e. Supply. The heat transfer member 428 is arranged in a direction extending in the width direction in each fluidized bed 455 of the drying

compartments

450a, 450b, 450c, 450d, and 450e.

In the fluidized bed drying apparatus 402, brown coal 432 is introduced into the drying compartment 450a of the drying container 420 by the supply hopper 401, and fluidized steam 436 is introduced into the chamber compartment 452a. The fluidized vapor 436 introduced into the chamber chamber 452a passes through the through hole 424a of the gas dispersion plate 424 and flows into the drying compartment 450a. The fluidized steam 436 that has flowed into the drying compartment 450a blows up and flows the lignite 432 introduced into the drying compartment 450a. Thereby, the fluidized bed drying apparatus 402 forms the fluidized bed 455 in which the brown coal 432 flows in the drying compartment 450a. A part of the lignite 432 fluidized in the drying compartment 450a moves upward in the vertical direction from the dividing plate 454, moves in the direction indicated by the arrow 456a, and moves to the drying compartment 450b.

In the fluidized bed drying apparatus 402, fluidized steam 436 is also introduced into the chamber compartment 452b. The fluidized vapor 436 introduced into the chamber chamber 452b passes through the through hole 424a of the gas dispersion plate 424 and flows into the drying compartment 450b. The fluidized steam 436 that has flowed into the drying compartment 450b blows up and flows the lignite 432 charged into the drying compartment 450b. Thereby, the fluidized bed drying apparatus 402 forms the fluidized bed 455 in which the lignite 432 flows in the drying compartment 450b. Part of the lignite 432 fluidized in the drying compartment 450b moves upward in the vertical direction with respect to the dividing plate 454, moves in the direction indicated by the arrow 456b, and moves to the drying compartment 450c. The fluidized bed drying apparatus 402 constitutes a fluidized bed 455 together with fluidized steam 436 to which lignite 432 moved in the drying

compartments

450c, 450d, and 450e is similarly supplied. Moreover, a part of lignite 432 of the fluidized bed 455 in the drying compartment 450c moves to the upper side in the vertical direction than the dividing plate 454, moves in the direction indicated by the arrow 456c, and moves to the drying compartment 450d. Part of the lignite 432 in the fluidized bed 455 of the drying compartment 450d moves to the upper side in the vertical direction than the dividing plate 454, moves in the direction indicated by the arrow 456d, and moves to the drying compartment 450e. The fluidized bed drying apparatus 402 discharges the lignite that has reached the discharge unit 423 out of the lignite 432 that is the fluidized bed 455 in the drying compartment 450e as the dry lignite 438 from the discharge unit 423.

Thus, in the fluidized bed drying apparatus 402, the fluidized bed 455 is formed in a portion including the drying compartments 450 a, 450 b, 450 c, 450 d, and 450 e, which are portions on the lower side in the vertical direction of the drying chamber 450. After the lignite 432 is input at the input unit 422, the lignite 432 is moved to form a fluidized bed 455, and sequentially passes through the drying

compartments

450a, 450b, 450c, 450d, and 450e in this order, and is discharged from the discharge unit 423. . The lignite 432 is gradually dried when passing through the drying

compartments

450a, 450b, 450c, 450d, and 450e, and becomes the dried lignite 438 when discharged from the discharge unit 423.

In the fluidized bed drying apparatus 402, a free board portion F is formed in a portion of the drying chamber 450 on the upper side in the vertical direction from the fluidized bed 455. This free board part F becomes an area | region where the generated steam 434 generate | occur | produces when the lignite 432 of the fluidized bed 455 is dried. Note that the fluidized steam 436 is steam at a certain temperature or higher, and heats the lignite 432 while flowing, thereby drying the lignite 432.

Next, as described above, the heat transfer member 428 is disposed in a region where the fluidized bed 455 of the drying

compartments

450a, 450b, 450c, 450d, and 450e is formed. The heat transfer member 428 is a heating unit that heats the lignite 432 of the fluidized bed 455 and removes moisture in the lignite 432, and is a pipe through which the superheated steam A can flow. The heat transfer member 428 dries the lignite 432 constituting the fluidized bed 455 using the latent heat of the high-temperature superheated steam A supplied and circulated inside. The heat transfer member 428 discharges the superheated steam A used for drying as condensed water B to the outside of the fluidized bed drying apparatus 402.

That is, the heat transfer member 428 condenses the superheated steam A in a region in contact with the fluidized bed 455 to form a liquid (moisture), which is effective for heating the lignite 432 by the condensed latent heat radiated at this time. Use. Note that the high-temperature superheated steam A to be circulated through the heat transfer member 428 may be any heat medium that involves a phase change, and examples thereof include Freon, pentane, and ammonia. Further, the heat transfer member 428 is not limited to a configuration using a pipe for circulating a heat medium. The heat transfer member 428 only needs to be able to supply heat to the lignite 432 and dry it. For example, an electric heater may be installed. The generated steam 434 generated when the lignite 432 is dried by the heat transfer member 428 flows to the free board portion F on the upper side in the vertical direction (downstream in the flow direction of the generated steam 434). Superheated steam supplying device 429 via a heating line L _4, and supplies the superheated steam A heat transfer member 428.

In the fluidized bed drying apparatus 402, the heat transfer member 428 provided inside the fluidized bed 455 heats the lignite 432 of the fluidized bed 455 to dry the lignite 432. The generated steam 434 generated by drying the lignite 432 flows from the fluidized bed 455 into the free board portion F. Then, the generated steam 434 that has flowed into the free board section F is discharged from the steam discharge section 427 to the outside of the fluidized bed drying apparatus 402. Generating steam 434 discharged from the steam discharge section 427 is supplied to generate steam line L _1.

The fluidized bed drying apparatus 402 divides the drying chamber 450 into a plurality of drying

compartments

450a, 450b, 450c, 450d, and 450e, and moves to the plurality of drying

compartments

450a, 450b, 450c, while moving from the input unit 422 to the discharge unit 423. By setting it as the structure which passes 450d and 450e in order, lignite can be dried more uniformly. That is, it is possible to suppress the occurrence of lignite 432 that reaches the discharge part 423 in a short time due to the flow of the fluidized bed 455 and the lignite 432 that does not reach the discharge part 423 even after a long time.

Further, as in the present embodiment, a part of the lignite 432 on the upper side of the fluidized bed 455 moves to the next drying compartment, so that the moisture content is relatively small in one drying compartment and moves upward. The lignite 432 being moved can be moved to the next drying compartment. That is, the lignite 432 that has a relatively high moisture content and is not dried in the dry compartment is heavy, and thus is moved to the lower side of the dry compartment and can be dried in the dry compartment. As a result, the lignite 432 moves to the next drying compartment after being dried to a certain level in each of the drying

compartments

450a, 450b, 450c, 450d, and 450e. It can be made into the dry state to the extent.

Moreover, since the fluidized bed drying apparatus 402 of the present embodiment can dry the lignite 432 suitably, the drying chamber 450 is divided into a plurality of drying compartments by the dividing plate 454, but is not limited thereto. The fluidized bed drying apparatus 420 can suppress the stay and settling of the lignite 432 regardless of the shape of the drying chamber 450, and can suppress the blockage of the lignite 432 in the drying chamber. Any shape that can be dried uniformly is acceptable.

The description of the other components of the fluidized bed drying facility 400 will be continued using FIGS. 9 and 10. Cooling trap 403, a fluidized bed dryer generating steam 434 from the steam discharge portion 427 is discharged to generate steam line L ₁ of 402 and cooled, to separate the dust (solid component), such as dust contained in the generated steam 434 . The cooling trap 403 includes a cooling mechanism 480 that cools the generated steam 434, and a collection unit 482 that collects water droplets containing dust aggregated as the generated steam 434 is cooled. Note that the cooling trap 403 may include a collection unit that is cooled to a predetermined temperature or less, in which the cooling mechanism 480 and the collection unit 482 are integrated. Cooling mechanism 480 of the cold trap 402 can use various cooling mechanisms, a double pipe structure disposed a pipe covering the periphery of generating steam line L _1, the pipe covering the periphery of generating steam line L ₁ mechanism and for cooling the steam generated 434 of the cooling medium flowed generating steam line L _1, the Peltier elements are arranged around the steam generated line L _1, it can be used a structure such to cool the generated steam line L _1. Further, it fell cooling performance, it is necessary to lengthen the pipe, cooling mechanism 480 does not include an active cooling mechanism, mechanism for cooling the steam generated 434 generated vapor line L ₁ by causing a predetermined distance passed and You can also Collecting portion 482 of the cooling trap 403 includes a plurality of plate-like members disposed in generating steam line L _1. The plate-like member may have a net shape having a large number of holes. The cooling trap 403 cools the generated steam 434 to be saturated steam. At this time, moisture in the steam is agglomerated using dust as a core. That is, the water droplet is formed in a state containing dust. The cooling trap 403 removes or reduces the dust contained in the generated steam 434 by collecting the water droplets containing the dust in the collection unit. Note that the generated steam 434 passes through the cooling trap 403 and becomes a generated steam 435a in which the temperature is lowered and dust is removed or reduced.

Superheating means 404 flows through the steam generated line _{L 1,} a means for superheating the steam generated 435a that has passed through the cold trap 403. As shown in FIG. 10, the superheating means 404 introduces the generated steam line L ₁ into the fluidized bed drying apparatus 402, specifically, the free board portion F of the drying container 420, and generates the generated steam line L _1. The steam 435 a is superheated with the generated steam 434 inside the fluidized bed drying device 402. Superheating means 404, by superheating the steam generated 435a through the generation steam line _{L 1,} the generated steam 435b became hotter than the steam generated 435a. Note that the superheating means 404 is preferably a pipe formed of a material that easily absorbs heat from the outside as a pipe through which the generated steam 435a flows. Further, it is preferable that the superheating means 404 has a shape in which the piping is bent at the free board portion F and the generated steam 435a moves a longer distance at the free board portion F. Moreover, it can heat also by heat exchange with the condensed water of the heat-transfer member 428 exit.

Branch 405 flows through the steam generated line _{L 1,} a mechanism for splitting the generated steam 435b that has passed through the heating means 404 into two lines. One line branched by the branching unit 405, connected to the heat recovery system 410 and the other line is connected to the circulating device 414 as the branch line L _2.

The cooler 410 cools the dried powder obtained by mixing the solid component 444 with the dried lignite 438 extracted from the fluidized bed drying device 402. Cooler 410 discharges from the product line _{L 3} The cooled powder as product coal 440. This product charcoal 440 is supplied to the gasifier 313 as described above.

The heat recovery system 411 is a system that recovers the heat of the generated steam 435b by heat exchange or the like. The generated steam 435b flowing through one of the pipes branched by the branching section 405 is, for example, steam at 405 to 110 ° C. The heat recovery system 411 performs heat recovery for the generated steam 435b. The water treatment unit 412 is a treatment device that treats the generated steam 435b heat recovered by the heat recovery system 411. The water treatment unit 412 treats the generated steam 435b heat recovered by the heat recovery system 411, and discharges the generated steam 435b to the outside of the fluidized bed drying facility 400 as drainage 442.

Further, the circulating apparatus 414 is interposed in the branch line L _2, and sends the air flowing through the branch line L ₂ in a predetermined direction. Specifically, the circulating apparatus 414 is branched by the branching unit 405 sends the generated steam 435b through the branch line _{L 2} to the fluidized bed dryer 402. The generated steam 435b sent into the fluidized bed drying device 402 is used as fluidized steam 436 that causes the fluidized bed of lignite 432 to flow. In addition, although the fluidized bed drying equipment 400 of the present embodiment reuses a part of the generated steam 435b as a fluidizing medium 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 may be used.

According to this coal gasification combined power generation facility 310, even when gasifying using lignite 432 having a high moisture content, since the lignite 432 is dried by the efficient fluidized bed drying device 402, the gasification efficiency is improved. The power generation can be improved stably over a long period of time.

In the fluidized bed drying facility 400 of the present embodiment, the generated steam 434 is cooled by the cooling trap 403 and dust is collected, whereby the dust in the generated steam 434 can be efficiently removed or reduced with a simple configuration. . By efficiently removing and reducing the dust in the generated steam 434, it is possible to reduce the influence of the dust on each part arranged downstream of the cooling trap 403 in the gas flow. Thereby, the apparatus lifetime of each part arrange | positioned downstream of the gas flow rather than the cooling trap 403 can be extended, and the frequency | count and frequency of a maintenance can be reduced.

In addition, the fluidized bed drying facility 400 of the present embodiment uses the generated steam 435a that has passed through the cooling trap 403 by the superheating means 404 as a heat source in the system of the fluidized bed drying facility 400, specifically, the free board portion F of the drying container 420. Heat is recovered from the generated steam 435b discharged from the fluidized bed drying device 402 by overheating (heat exchange) with the heat of the generated steam 434 to generate the generated steam 435b. From the above, the fluidized bed drying apparatus 400 of the present embodiment can efficiently remove dust from the generated steam by cooling the generated steam 434 with the cooling trap 403 and then reheating it with the superheating means 404. The latent heat of steam can be recovered. Further, by using the heat of the generated steam 434 of the free board portion F of the drying container 420 as a heat source for heating the generated steam, the generated steam 435a can be heated without providing a new heat source. Further, as described above, the heat source may be condensed water returning from the heat transfer member 428.

In addition, although the fluidized bed drying equipment 400 of the present embodiment uses a part of the generated steam 435b after being branched by the branching unit 405 in the heat recovery system 411, the remaining part is used as fluidized steam. It is not limited to. The fluidized bed drying facility 400 may effectively utilize the heat of the generated steam 435b after being heated by the heating means 404.

A fluidized bed drying facility according to Example 7 will be described with reference to FIG. Here, FIG. 11 is a schematic diagram illustrating a fluidized bed drying facility including the fluidized bed drying apparatus according to the seventh embodiment. A fluidized bed drying facility 500 shown in FIG. 11 includes a supply hopper 401, a fluidized bed drying device 402, a cooling trap 403, a superheating means 510, a branching unit 405, a cooler 410, a heat recovery system 411, water A processing unit 412 and a circulation device 414 are provided. Moreover, fluidized bed drying equipment 500 includes a generating steam line _{L 1} as a pipe connecting the respective units, a branch line _{L 2,} the product line _{L 3,} the. In addition, since the structure of each part other than the superheating means 510 is the same as the fluidized bed drying equipment 400, the fluidized bed drying equipment 500 is abbreviate | omitted description.

Superheating means 510 flows through the steam generated line _{L 1,} a means for superheating the steam generated 435a that has passed through the cold trap 403. As shown in FIG. 11, the superheating means 510 includes a portion where the generated steam 435 a that has passed through the cooling trap 403 of the generated steam line L ₁ and a region where the condensed water B of the heat transfer member 428 flows, that is, the heat transfer member 428. Out of the drying container 420 through which the condensed water B after passing through the inside of the drying container 420 flows, the generated steam 435a is superheated with the condensed water B. The superheating means 510 is a mechanism that performs heat exchange between the generated steam 435a and the condensed water B. Superheating means 510, by superheating the steam generated 435a through the steam generated line _{L 1} in the condensed water B, and generates steam 435b became hotter than the steam generated 435a. In addition, it is preferable that the superheating means 510 uses a pipe formed of a material that easily absorbs heat from the outside as a pipe through which the generated steam 435a flows.

The fluidized bed drying facility 500 can obtain the same effect as the fluidized bed drying facility by using the superheating means 510 to superheat the generated steam 435a with the heat of the condensed water B flowing through the heat transfer member 428. Further, since the condensed water B is generated when the superheated steam A superheats the fluidized bed, it does not affect other processes even if it is used to superheat the generated steam 435a. Moreover, since the condensed water B is a used substance, the utilization efficiency of heat generated in the fluidized bed drying facility 500 can be improved by utilizing the heat of the condensed water B.

DESCRIPTION OF SYMBOLS 10,310 Coal gasification combined cycle power generation equipment 11

Coal supply equipment

12,12A Fluidized bed drying equipment 13 Pulverized coal machine 14 Coal gasification furnace 15 Char recovery equipment 16 Gas purification equipment 17 Gas turbine equipment 18 Steam turbine equipment 19 Generator 20 Exhaust

Heat recovery boiler

101, 201

Drying container

102, 202 Raw coal inlet (wet raw material inlet)
103,203 Dry coal discharge port (dry matter discharge part)
104,204 Fluidized gas supply port (fluidized gas supply unit)
105,205 Gas outlet (gas outlet)
106,206 Heat transfer tube (heating unit)
107,207 Dispersion plate 111 Inclination plate (guide device)
112, 212, 222 Colliding plate (guide device)
113,213 Current guide plate (guide device)
121 Inclined belt (guide device, transport device)
131 Inclined head (guide device, transport device)
400 Fluidized Bed Drying Equipment 401 Supply Hopper 402 Fluidized Bed Dryer 403

Cooling Trap

404, 510 Superheater 405 Branching Section 410 Cooler 411 Heat Recovery System 420 Drying Container 422 Input Portion 423 Discharge Portion 424 Gas Dispersion Plate 426 Fluidized Gas Supply Portion 427 Steam discharge unit 428 Heat transfer member 429 Superheated steam supply device 432

Brown coal

434, 435a, 435b Generated steam 436 Fluidized steam 438 Dry brown coal 440 Product coal 442 Drainage 450

Drying chamber

450a, 450b, 450c, 450d, 450e Drying compartment 452

Chamber chambers

452a, 452b, 452c, 452d, 452e chamber compartments 454 divided plate 455

fluidized layer

456a, 456b, 456c, 456d arrow A superheated steam B condensate F freeboard L ₁ generates steam la Down L ₂ line L ₃ product line L ₄ heating line

Claims

A drying container having a hollow shape;
A wet raw material charging unit for charging the wet raw material to one end of the drying container;
A dry matter discharge section for discharging a dry matter obtained by heating and drying the wet raw material from the other end of the drying container;
A fluidized gas supply unit that forms a fluidized bed with the wet raw material by supplying a fluidized gas to a lower portion of the drying container;
A gas discharge part for discharging fluidized gas and generated steam from above the wet raw material input part on one end side of the drying container;
A heating unit for heating the wet raw material of the fluidized bed;
A guide device for guiding the fluidized gas and the generated steam from the dry matter discharge unit side to the wet raw material input unit side to guide the gas discharge unit;
A fluidized bed drying apparatus comprising:
The guide device is provided in a free board part above the fluidized bed, and the entrained gas and the generated steam collide with the fluidized gas introduced from the dry matter discharge part side to the wet raw material input part side. The fluidized bed drying apparatus according to claim 1, further comprising an impingement plate that separates particles of the dried product.
The collision plates are opposed to the flow direction of the fluidized gas and the generated steam, and are arranged at a plurality of predetermined intervals in the flow direction. The fluidized bed drying apparatus according to claim 2, wherein the fluidized bed drying apparatus is disposed at a position inclined upward from the wet raw material charging unit side toward the dry matter discharge unit side.
The said guide apparatus is provided in the free board part above the said fluidized bed, and has an inclination board which inclines upwards from the said wet raw material injection | throwing-in part side toward the said dry matter discharge | emission part side. Or the fluidized bed drying apparatus according to 3;
5. The apparatus according to claim 2, further comprising: a transport device configured to transport the particles of the dried material dropped on the inclined plate by the plurality of collision plates to the wet raw material charging unit side in the drying container. The fluidized bed drying apparatus according to one.
The said guide apparatus is provided in the said free board part above the said fluidized bed, and has a partition plate which partitions off the said wet raw material injection | throwing-in part and the said gas discharge part, The one of Claim 1 to 5 characterized by the above-mentioned. Fluidized bed drying apparatus as described in one.
A drying container, an input part for supplying wet raw material to one end of the drying container, a discharge part for discharging dry material obtained by heating and drying the wet raw material from the other end of the drying container, and being input into the drying container A gas dispersion plate in which a through hole capable of supplying gas from the chamber chamber to the drying chamber is formed by separating the wet raw material into a drying chamber and a chamber chamber vertically below the drying chamber; In the drying chamber, a fluidizing gas that forms a fluidized bed with a wet raw material is supplied to the chamber chamber, and a fluidizing gas supply unit that supplies the fluidizing gas to the wet raw material in the fluidized bed that is formed. A fluidized bed drying apparatus that includes a steam discharge unit that discharges generated steam generated from the top of the drying container, and dries the wet raw material having a high water content in the drying container;
A generated steam line for discharging generated steam discharged from the steam discharge unit of the fluidized bed drying apparatus to the outside,
A cooling trap interposed in the generated steam line for cooling the generated steam and removing dust contained in the generated steam;
A fluidized bed drying facility comprising: a cooler that cools a dried product obtained by drying the wet raw material discharged from the discharge unit.
The said fluidized bed drying apparatus is further equipped with the heating means which has a superheated medium supply apparatus which supplies a superheated medium to the piping arrange | positioned inside the said fluidized bed of the said drying container, and the said piping. Fluidized bed drying equipment described in 1.
The cooling steam is interposed downstream of the cooling trap in the generated steam line, and the cooled generated steam is guided to a region vertically above the fluidized bed inside the drying container, and inside the drying container The fluidized bed drying facility according to claim 7 or 8, further comprising superheating means for superheating with generated steam.
Superheating that is interposed downstream of the cooling trap in the generated steam line and overheats the cooled generated steam with a superheating medium that flows through the piping in a region after passing through the inside of the fluidized bed of the heating means. The fluidized bed drying facility according to claim 8, further comprising means.
The branch line for branching a part of the generated steam heated by the superheating means and supplying the fluidized gas to the fluidized gas supply unit is further provided. Fluidized bed drying equipment.
12. The heat recovery system according to claim 9, further comprising: a heat recovery system that branches a part of the generated steam heated by the superheating means and recovers heat of the generated steam. Fluidized bed drying equipment.