PMHA-13039-PCT 1 DESCRIPTION FLUIDIZED BED DRYING FACILITY AND INTEGRATED COAL GASIFICATION COMBINED CYCLE SYSTEM Field 5 [0001] The present invention relates to a fluidized bed drying facility and an integrated coal gasification combined cycle system that are applicable to a gasification system for gasifying coal. Background 10 [0002] For example, an integrated coal gasification combined cycle facility is a power generation facility aiming at higher efficiency and higher environmental performance than conventional coal-fired power generation, by gasifying coal and using in combination with combined 15 cycle power generation. It is known that the integrated coal gasification combined cycle facility has a great merit in its ability to use coal which is an abundant resource and has a more enhanced merit by increasing types of coals to be used. 20 [0003] Generally, a conventional integrated coal gasification combined cycle facility includes a coal supplying apparatus, a drying apparatus, a coal gasification furnace, a gas purification apparatus, a gas turbine equipment, a steam turbine equipment, a heat 25 recovery steam generator, a gas cleaning apparatus and the like. Therefore, the coal, which is milled after being dried, supplied to the coal gasification furnace as powdered coal is combusted and gasified in the coal gasification furnace to produce a produced gas (combustible 30 gas) by air introduced to the coal gasification furnace at the time of supplying the coal. In addition, the produced gas is gas-purified and then is supplied to the gas turbine equipment so as to be combusted, thereby producing a high- PMHA-13039-PCT 2 pressure and high-temperature flue gas to drive a turbine. In the flue gas after driving the turbine, steam is generated by recovering heat energy of the flue gas with the heat recovery steam generator, and the generated steam 5 is supplied to the steam turbine equipment to drive the turbine. For this reason, electricity is generated. Meanwhile, the flue gas from which the heat energy is recovered is released to an atmosphere through a stack after harmful substances are removed by the gas cleaning 10 apparatus. [0004] However, as the coal to be used in the IGCC (integrated coal gasification combined cycle) system, coals of a high grade (high-grade coal) such as bituminous coal or anthracite coal having high calorific value are used. 15 It is necessary to powder the coal to be supplied to the IGCC (integrated coal gasification combined cycle) system, from the point of view of reactivity and airflow transportation in a coal gasification furnace, a coal mill is used as a coal powdering machine. For this reason, the 20 coal to be supplied as a raw material is first coarsely milled by a crusher and then is dried by a drying machine, and the dried coal is stored in a dried coal bunker. Then, the coal is supplied to the coal mill by the coal supplying apparatus and is milled and dried to become the powdered 25 coal. Then, the milled coal is carried from a carrier gas and is supplied to the coal gasification furnace (Patent Literature 1). [0005] However, in the case of performing drying in a extrusion manner (plug flow type) in steam fluidized bed 30 drying, moisture load is maximum at an inlet, thus there is a problem in that moisture is condensed on the surface of the coal, which leads to a poor flow. The conventional apparatus for drying the coal adjusts 3 a supply quantity of a fluidizing gas at the inlet so as to avoid the poor flow of the coal which is an object to be dried (Patent Literature 2). Citation List Patent Literature [0006] Patent Literature 1: Japanese Laid-open Patent Publication No. 7-279621 Patent Literature 2: Japanese Laid-open Patent Publication No. 6-299176 [0006a] Any discussion of the prior art throughout the specification should in no way be considered as an admission that such prior art is widely known or forms part of common general knowledge in the field. Summary Technical Problem [0007] However, the above-described Patent Literatures 1 and 2 have a problem in that since moisture concentration of the coal is high at the inlet, the amount of fluidizing gas becomes excessive and a facility aspect and a running cost increase. Even in the method used to solve this problem, a method of reducing the moisture load at the inlet by circulating a dried coal at the inlet is also proposed, but there is a problem in that ancillary facilities for circulation (for example, conveyer, hopper or the like) have a large scale. [0008] In addition, since foreign materials such as silt are contained in the coal, there is a problem in that a trouble of a crusher and a drying apparatus is caused. Further, with respect to mill of a raw coal, since fine particles are contained in the raw coal, there is a problem in that unnecessary power is consumed in the case of milling all raw coals with the crusher. [0009] Accordingly, since it is possible to supply the coal with high efficiency to a gasification system for gasifying the coal, development of a fluidized bed drying facility capable of 4 achieving reduction of the cost is required in the case of drying a low-grade coal. [0010] The present invention has been made to solve the above problems, and is directed to provide a fluidized bed drying facility and an integrated coal gasification combined cycle system, which are capable of achieving the reduction of the drying cost. [0010a] It is an object of the present invention to overcome or ameliorate at least one of the disadvantages of the prior art, or to provide a useful alternative. [0010b] Unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is to say, in the sense of "including, but not limited to". Solution to Problem [0011] According to a first aspect of the present invention in order to overcome the problems, there is provided a fluidized bed drying facility, comprising: a fluidized bed drying apparatus for supplying a fluidizing gas to a drying chamber so as to fluidize and dry a low-grade coal supplied to the drying chamber; a raw-coal fluidized bed bunker provided upstream of the fluidized bed drying apparatus, for temporarily fluidizing a low-grade raw coal and storing the low-grade raw coal, the raw coal fluidized bed bunker including a freeboard formed on an upper space of the fluidized bed bunker and an inlet for receiving the low-grade raw coal provided below the freeboard; a raw-coal fine particle discharging line on which a cyclone is interposed for extracting a raw-coal fine particle from the freeboard of the raw-coal fluidized bed bunker, the raw-coal fine particle discharging line being in communication with the drying chamber; a raw-coal coarse particle discharging line for discharging 4a a raw-coal coarse particle from a lower side of the inlet of the raw-coal fluidized bed bunker, the raw-coal coarse particle discharging line being separated from the raw-coal fine particle discharging line; a mill for milling the raw-coal coarse particle; and a milled coal supplying line for supplying the milled coal to the drying chamber. [0012] According to a second aspect of the present invention, there is provided the fluidized bed drying facility according to the first aspect, further including: a partition wall formed in a fluidized bed of the raw-coal fluidized bed bunker; and a raw coal fine particle discharging line for discharging the raw coal fine particle discharged from the partition wall. [0013] According to a third aspect of the present invention, there is provided an integrated coal PMHA-13039-PCT 5 gasification combined cycle system including: a fluidized bed drying facility according to the first or second aspect; a coal gasification furnace for processing a dried coal supplied from the fluidized bed drying apparatus so as 5 to convert into a gasified gas; a gas turbine (GT) operated using the gasified gas as a fuel; a steam turbine (ST) operated by steam generated with a heat recovery steam generator for introducing a turbine flue gas from the gas turbine; and a generator (G) connected to the gas turbine 10 and/or the steam turbine. Advantageous Effects of Invention [0014] According to a fluidized bed drying facility of the present invention, it is possible to achieve reduction of moisture load at an introducing part of a low-grade coal 15 by discharging some of dried coals and supplying the discharged dried coal to a wet low-grade coal again. Brief Description of Drawings [0015] FIG. 1 is a schematic view of a fluidized bed drying facility according to a first embodiment. 20 FIG. 2 is a schematic view of a fluidized bed drying facility according to a second embodiment. FIG. 3 is a schematic configuration diagram of an integrated coal gasification combined cycle system according to a third embodiment. 25 Description of Embodiments [0016] Exemplary embodiments of a fluidized bed drying facility according to the present invention will be described below in detail with reference to the accompanying drawings. The present invention is not 30 limited to the following embodiments, but may be constituted in combination with each of embodiments in cases of several embodiments. First Embodiment PMHA-13039-PCT 6 [0017] FIG. 1 is a schematic view of a fluidized bed drying facility according to a first embodiment. As illustrated in FIG. 1, a fluidized bed drying facility 100A according to the first embodiment is provided 5 with a fluidized bed drying apparatus 102 which supplies a fluidizing gas (steam) 107 to a drying chamber to fluidize and dry a low-grade coal supplied to the drying chamber, a raw-coal fluidized bed bunker 50 which is provided at an upstream side of the fluidized bed drying apparatus 102 to 10 store a low-grade raw coal 101 while temporarily fluidizing the low-grade raw coal 101, a raw-coal fine particle discharging line L 11 which discharges a raw-coal fine particle 101A from an upper side of the raw-coal fluidized bed bunker 50, a raw-coal coarse particle discharging line 15 L 12 which discharges a raw-coal coarse particle 101B from a lower side of the raw-coal fluidized bed bunker 50, a mill 56 which mills the raw-coal coarse particle 101B, and a milled coal supplying line Li which supplies a milled coal 101C to the drying chamber. 20 [0018] As illustrated in FIG. 1, the raw-coal fluidized bed bunker 50 is provided at an upstream side of the fluidized bed drying apparatus 102 to preliminarily dry the raw coal (low-grade coal) 101 by a fluidizing gas 52. During the preliminary drying, since the preliminarily 25 dried raw-coal fine particle 101A exists in a gas which floats in a freeboard F, the raw-coal fine particle 101A and an flue gas 55 are separated through a cyclone 54 which is interposed between the raw-coal fine particle discharging line L 11 by discharging the raw-coal fine 30 particle 101A through the raw-coal fine particle discharging line L 11 . The separated raw-coal fine particle 101A joins together at the milled coal supplying line Li for supplying the milled coal 101C which is milled by the PMHA-13039-PCT 7 mill 56 and then is supplied to the fluidized bed drying apparatus 102. [0019] Here, examples of the fluidizing gas 52 supplied from a flow regulating plate 51 into the raw-coal fluidized 5 bed bunker 50 include nitrogen, air, or a cooling flue gas 113 during cooling of a dried coal. [0020] By circulating the fluidizing gas 52 through the raw coal 101, segregation is accelerated, resulting in separating the raw-coal fine particle 101A and the raw-coal 10 coarse particle 101B into an upper part and a lower part, respectively. [0021] By setting a flow rate of the fluidizing gas 52 to an optimum flow rate, the raw-coal fine particle 101A is supplied to the fluidized bed drying apparatus 102 from the 15 upper part through the cyclone 54. [0022] On the other hand, when the raw-coal coarse particle 101B is concentrated and fluidized in the lower part side of the fluid bed, a large agglomerate foreign material 53 is discharged from the lower part. 20 In addition, the raw-coal coarse particle 101B is discharged from a predetermined position between the bottom and the middle of the fluidized bed so as to separate from the foreign material 53. [0023] When the raw-coal fine particle 101A within the 25 raw-coal fluidized bed bunker 50 is discharged into the cyclone 54 through the raw-coal fine particle discharging line L 11 by wind-power classification when floating in the freeboard F. Further, since the raw-coal coarse particle 101B is 30 charged to the mill 56 after the foreign material is removed, extra mill is required in the mill 56. For this reason, it is possible to reduce the power of the mill 56. [0024] In addition, since the large agglomerate foreign PMHA-13039-PCT 8 material 53 is removed in advance, the trouble in the mill 56 is avoided. Moreover, the foreign material 53 may again be charged to the raw-coal fluidized bed bunker 50 together with the raw coal 101 by separating a metal, silt or the 5 like with a sorting machine, for example. [0025] Like this, according to the present embodiment, the segregation is accelerated in the raw-coal fluidized bed bunker 50. Thus, the raw coal 101 is classified into the raw-coal fine particle 101A, the raw-coal coarse 10 particle 101B, and the large agglomerate foreign material 53. In this case, since the raw-coal fine particle 101A is directly supplied to the fluidized bed drying apparatus 102, the mill in the mill 56 is unnecessary, thereby improving mill efficiency of the mill 56. 15 [0026] In addition, since only the raw-coal coarse particle 101B may selectively be supplied to the mill 56 by discharging the large agglomerate foreign material 53 into an outside of the system, it is possible to achieve effective mill. Accordingly, it is possible to reduce the 20 mill capacity and the power of the mill 56. Further, since the foreign material 53 is removed in advance, it is possible to avoid the trouble during the mill. [0027] A gas exhaust line L 4 provided above the drying chamber of the fluidized bed drying apparatus 102 is 25 provided with a precipitator 105 such as a cyclone that removes dusts contained in generated steam 104 and a latent heat recovery system 106 that is interposed downstream side of the precipitator 105 to recover heat of the generated steam 104. 30 [0028] A main body of the fluidized bed drying apparatus 102 is fluidized by a fluidizing steam 107 which is introduced into therein from pores of a flow regulating plate 116 to form a fluidized bed 111.
PMHA-13039-PCT 9 [0029] A heat transfer member 103 is disposed in the fluidized bed 111. Drying steam (superheated steam) A of, for example, 150 0 C is supplied into the heat transfer member 103 such that the milled coal 101C is indirectly 5 dried using the latent heat of the high-temperature drying steam (superheated steam) A. The drying steam (superheated steam) A used for the drying is discharged to the outside of the fluidized bed drying apparatus 102, as a condensed water B of, for example, 150 0 C. 10 [0030] That is, since the drying steam (superheated steam) A is condensed to become a liquid (moisture) inside the heat transfer member 103 serving as a heat means, condensed latent heat to be radiated at this time is effectively used for drying and heating the milled coal 15 101C. Moreover, as the heat means other than the high temperature drying steam (superheated steam) A, any heat medium may be used as long as phase-change is accompanied. For example, the heat medium may be Freon, pentane, ammonia or the like. Further, in addition to using the heat medium 20 as the heat transfer member, an electric heater may be installed. [0031] The generated steam 104 for generating when the milled coal 101C is dried by the heat transfer member 103 is discharged from the freeboard F formed on an upper space 25 of the fluidized bed 111 within the fluidized bed drying apparatus 102 to the outside of the fluidized bed drying apparatus 102 through the gas exhaust line L 4 . The generated steam 104 is dust-collected by, for example, the precipitator 105 and is separated as a dried fine powder 30 115 because of containing dried and powdered substances. The dried fine powder 115 is mixed with the milled coal 101C supplied from the mill 56 and then is charged into the fluidized bed drying apparatus 102.
PMHA-13039-PCT 10 A dried coal 101D discharged through the dried coal discharging line L 2 from the fluidized bed drying apparatus 102 is cooled by a cooling machine 110, and a cooled and dried coal 101E is supplied to a coal gasification furnace 5 14 (see FIG. 3 to be described later). In addition, the dried fine powder 115 may be mixed with the dried coal 101D. The cooling machine 110 cools the dried coal 101D using a cooling gas 112 such as nitrogen or air. [0032] Meanwhile, since the generated steam 104 after 10 the dust is collected by the precipitator 105 is the steam of 105 to 110 0 C, for example, it is thermally recovered by the latent heat recovery system 106 and then is treated with a water treatment unit, and the a cooling water 108 contributes to cool in the cooling machine 110. Further, 15 it may effectively use the heat generated by applying the generated steam 104 after the dust is collected by the precipitator 105 to, for example, a heat exchanger or a steam turbine. [0033] In addition, after the dust is collected by the 20 precipitator 105, some of the generated steam 104 is fed into the fluidized bed drying apparatus 102 by, for example, a circulating fan 114 interposed between fluidized gas supplying lines L 3 to use as the fluidizing steam 107 which fluidizes the fluidized bed 111 of the low-grade coal 101. 25 In the present embodiment, further, as a fluidizing medium which fluidizes the fluidized bed 111, some of the generated steam 104 is reused, but, for example, nitrogen, carbon dioxide, or air of low oxygen concentration containing these gases may be used without being limited 30 thereto. [0034] In addition, the present embodiment illustrates a tube-shaped heat transfer member as the above-described heat transfer member 103, but the present invention is not PMHA-13039-PCT 11 limited thereto and may be configured to use a plate-shaped heat transfer member, for example. Further, the present embodiment describes the configuration for indirectly drying the low-grade coal by 5 supplying the drying steam (superheated steam) A to the heat transfer member 103, but the present invention is not limited thereto and may be configured to have the structure for directly drying the low-grade coal by the fluidizing steam 107 which fluidizes the fluidized bed 111 of the low 10 grade coal and another configuration for drying by supplying the fluidizing gas for heating. [0035] According to the present embodiment, at a previous stage of the drying in the fluidized bed drying apparatus 102, the raw coal 101 is fluidized by the 15 fluidizing gas 52 within the raw-coal fluidized bed bunker 50 and then is divided into the raw-coal fine particle 101A and the raw-coal coarse particle 101B, and the raw-coal coarse particle 101B which is preliminary dried by the fluidizing gas is milled by the mill 56, thereby it is 20 possible to effectively dry the low-grade coal supplied to the fluidized bed drying apparatus 102. Second Embodiment [0036] FIG. 2 is a schematic view of a fluidized bed drying facility according to a second embodiment. 25 As illustrated in FIG. 2, a fluidized bed drying facility 100B according to the present embodiment is provided with a partition wall 81 formed at a portion of the fluidized bed of the raw-coal fluidized bed bunker 50 and an discharging part 82 for discharging the raw-coal 30 fine particle 101A which overflows an upper part of the partition wall 81 in the vicinity of the top of the fluidized bed. [0037] Then, the raw-coal fine particle 101A overflowing PMHA-13039-PCT 12 the top of the partition wall 81 falls into an discharging part 82, and the discharged raw-coal fine particle 101A is mixed with the milled coal supplying line Li for supplying the milled coal 101C milled by the mill 56, through a raw 5 coal discharging line L 13 , to supply to the fluidized bed drying apparatus 102. Third Embodiment [0038] FIG. 3 is a schematic configuration diagram of an integrated coal gasification combined cycle system 10 according to a third embodiment. [0039] The IGCC (integrated coal gasification combined cycle) system according to the third embodiment generates electricity by employing an air combustion system which generates a coal gas with a coal gasification furnace using 15 air as an oxidant and by supplying the coal gas, after being purified by a gas purification apparatus, to a gas turbine equipment as a fuel gas. That is, the IGCC (integrated coal gasification combined cycle) equipment according to the present embodiment is generation equipment 20 of the air combustion system (air blowing). In the present embodiment, the low-grade coal is used as a coal feedstock for supplying to a coal gasification furnace 14. [0040] In the third embodiment, as illustrated in FIG. 3, an integrated coal gasification combined cycle facility 10 25 includes a fluidized bed drying facility 100A (100B) that is made of a fluidized bed drying apparatus 102A (102B) provided with a raw-coal fluidized bed bunker 50 for preliminarily drying a low-grade coal 101 serving as a raw coal in advance to dry the raw coal 101, a coal 30 gasification furnace 14 that produces a combustible gas (product gas, coal gas) 200 by supplying a cooled and dried coal (dried coal) 101E to gasify the coal, a char recovery unit 15 that recovers a char 101F in the combustible gas PMHA-13039-PCT 13 (product gas, coal gas) 200 which is a gasified gas, a gas purification apparatus 16 that purifies a combustible gas (product gas, coal gas) 200A, gas turbine equipment 17 that combusts a purified fuel gas 200B to drive a turbine, a 5 steam turbine (ST) equipment 18 that is operated by the steam generated with a heat recovery steam generator (HRSG) 20 for introducing a turbine flue gas from the gas turbine equipment 17, and a generator (G) 19 that is connected to the gas turbine equipment 17 and/or the steam turbine 10 equipment 18. [0041] Low-grade coal supplying equipment 11 according to the present embodiment includes the raw-coal fluidized bed bunker 50 and the mill 56. A raw-coal bunker (not illustrated) can store the raw coal (low-grade coal) 101 15 and thus can charge a predetermined amount of the raw coal 101 into the raw-coal fluidized bed bunker 50. A raw-coal coarse particle 101B dried by the raw-coal fluidized bed bunker 50 is milled to a predetermined size by the mill 56 to become a milled coal 101C. 20 [0042] In the fluidized bed drying apparatus 102A (102B), the apparatus according to the first embodiment or the second embodiment is used, drying steam (for example, superheated steam of about 150 0 C) A is supplied to the milled coal 101C to be supplied after preliminarily drying 25 and classifying with the raw-coal fluidized bed bunker 50 to thermally dry the low-grade coal while fluidizing the low-grade coal, thus it is possible to remove moisture contained in the coal 101. Then, the fluidized bed drying apparatus 102A (102B) is provided with a cooling machine 30 110 for cooling a dried coal 101D which is taken out to the outside, and a dried coal 101E which is dried and cooled is stored in a dried coal bunker 34. In addition, the fluidized bed drying apparatus 102A (102B) is provided with PMHA-13039-PCT 14 a precipitator 105 such as a dried coal cyclone which separates particles of the dried coal carried with the generated steam 104 which is taken out from the upper part and separates fine particles of the dried coal from the 5 generated steam 104. Further, the steam from which the dried coal is separated by the precipitator 105 such as the dried coal cyclone is compressed by a steam compressor and then may be supplied to the fluidized bed drying apparatus 102 as drying steam A. 10 [0043] The dried coal 101E which is dried and cooled, that is, which is dried by the fluidized bed drying apparatus 102 and then is cooled by the cooling machine 110 is supplied through a dried coal discharging line 123 and then is temporarily stored in the dried coal bunker 34 15 through a bag filter 32 and a bin system 33. [0044] The coal gasification furnace 14 is recyclable such that the dried coal 101E of fine particle supplied from the dried coal bunker 34 can be supplied and the char (unburnt combustible content of coal) 101F recovered by the 20 char recovery unit 15 is returned. [0045] That is, since a compressed air supplying line 41 is connected to the coal gasification furnace 14 from the gas turbine equipment 17 (compressor 61), the compressed air compressed by the gas turbine equipment 17 can be 25 supplied to the coal gasification furnace 14. An air separating apparatus 42 separates and produces nitrogen
(N
2 ) and oxygen (02) from air 40 in the atmosphere. Accordingly, a first nitrogen supplying line 43 is connected to the coal gasification furnace 14 and is 30 connected to the dried coal discharging line 123. In addition, a second nitrogen supplying line 45 is also connected to the coal gasification furnace 14 and is connected to a char returning line 46 which returns the PMHA-13039-PCT 15 char 101F recovered by the char recovery unit 15. Further, an oxygen supplying line 47 is connected to the compressed air supplying line 41. In this case, nitrogen (N 2 ) is used as a delivering gas of the dried coal 101E or the char 101F, 5 and oxygen (02) is used as an oxidant. [0046] The coal gasification furnace 14 is an entrained bed gasification furnace to combust and gasify the dried coal 101E, the char 101F, air (oxygen) supplied therein, or vapor serving as a gasifying agent and to produce the 10 combustible gas (produced gas, coal gas) 200 containing carbon monoxide as a main component, thereby generating gasification reaction using the combustible gas 200 as the gasifying agent. Moreover, the coal gasification furnace 14 is provided with a foreign material removing apparatus 15 48 which removes foreign materials such as a molten slug with which powdered coal is mixed. The present embodiment illustrates the entrained bed gasification furnace as the coal gasification furnace 14, but the present invention is not limited thereto and may 20 employ a fluid bed gasification furnace or a fixed bed gasification furnace. Further, the coal gasification furnace 14 is provided with a gas producing line 49 of the combustible gas 200 toward the char recovery unit 15, thus it is possible to discharge the combustible gas 200 25 containing the char 101F. In this case, by additionally providing a gas cooling machine at the gas producing line 49, it may cool the combustible gas 200 to a predetermined temperature and then supply to the char recovery unit 15. [0047] The char recovery unit 15 includes a precipitator 30 58 and a char supplying hopper 59. In this case, the precipitator 58 is made up of one or more bag filters or cyclones to separate the char 101F contained in the combustible gas 200 produced by the coal gasification PMHA-13039-PCT 16 furnace 14. The combustible gas 200A from which the char 101F is separated is fed to the gas purification apparatus 16 through a gas discharging line 60. The char supplying hopper 59 stores the char 101F separated from the 5 combustible gas 200 by the precipitator 58. Moreover, a bin may be configured to be disposed between the precipitator 58 and the supplying hopper 59 such that a plurality of char supplying hoppers 59 is connected to the bin. Further, the char returning line 46 extending from 10 the char supplying hopper 59 is connected to the second nitrogen supplying line 45. [0048] The gas purification apparatus 16 performs gas purification by removing impurities such as a sulfur compound or a nitrogen compound contained in the 15 combustible gas 200A from which the char 101F is separated by the char recovery unit 15. Further, the gas purification apparatus 16 produces a fuel gas 200B by purifying the combustible gas 200A from which the char 101F is separated and supplies the produced fuel gas 200B to the 20 gas turbine equipment 17. Moreover, in the gas purification apparatus 16, since the sulfur content (H 2 S) is still contained in the combustible gas 200A from which the char 101F is separated, the sulfur content is removed using for example an amine absorbent or the like to recover 25 eventually sulfur content as a gypsum to effectively use. [0049] The gas turbine equipment 17 includes a compressor 61, a combustor 62, and a turbine 63. The compressor 61 and the turbine 63 are connected to each other by a rotation shaft 64. The combustor 62 is 30 connected to a compressed air supplying line 65 extending from the compressor 61 and is also connected to a fuel gas supplying line 66 extending from the gas purification apparatus 16, and the turbine 63 is connected to a fuel gas PMHA-13039-PCT 17 supplying line 67. The gas turbine equipment 17 is provided with a compressed air supplying line 41 extending to the coal gasification furnace 14 from the compressor 61, and a booster 68 is provided at a midway part of the gas 5 turbine equipment 17. Accordingly, the combustor 62 mixes and combusts a compressed air 40A supplied from the compressor 61 and a fuel gas 200B supplied from the gas purification apparatus 16, and the turbine 63 can drive the generator 19 by rotating the rotation shaft 64 with a 10 produced combustion gas 202. [0050] The steam turbine equipment 18 includes a turbine 69 which is connected to the rotation shaft 64 in the gas turbine equipment 17, and the generator 19 is connected to a base end of the rotation shaft 64. The heat recovery 15 steam generator 20 is provided on a flue gas line 70 extending from the gas turbine equipment 17 (turbine 63) to perform heat exchange between air 40 and a high-temperature flue gas 203, thereby generating steam 204. For this reason, the heat recovery steam generator 20 is provided 20 with a steam supplying line 71 which supplies the steam 204 between the turbines 69 of the steam turbine equipment 18 and a steam recovery line 72, and a condenser 73 is provided to the steam recovery line 72. Accordingly, in the steam turbine equipment 18, the turbine 69 is driven by 25 the steam 204 supplied from the heat recovery steam generator 20, resulting in driving the generator 19 by rotating the rotation shaft 64. [0051] In addition, a gas purification apparatus 74 removes harmful materials contained in a flue gas 205 from 30 which the heat is recovered by the heat recovery steam generator 20, and a purified flue gas 205A is released to an atmosphere from a stack 75. [0052] Here, operations of the integrated coal PMHA-13039-PCT 18 gasification combined cycle facility 10 according to the third embodiment will be described. [0053] In the integrated coal gasification combined cycle facility 10 according to the third embodiment, the 5 coal serving as the raw coal 101 is separated into the raw coal fine particle 101A and the raw-coal coarse particle 101B with the raw-coal fluidized bed bunker 50 at the low grade coal supplying equipment 11. The separated raw-coal coarse particle 101B is supplied to the mill 56 and is 10 milled into a predetermined size. Then, the milled coal 101C is thermally dried by the fluidized bed drying apparatus 102, and the dried coal 101D is discharged from the dried coal discharging line 123 and then is cooled by the cooling machine 110 to be stored in the dried coal 15 bunker 34 as the dried coal 101E of the cooled fine particle. [0054] The already-cooled dried coal 101E stored in the dried coal bunker 34 is supplied to the coal gasification furnace 14 through the dried coal discharging line 123 by 20 nitrogen supplied from the air separating apparatus 42. In addition, the char 101F recovered by the char recovery unit 15, which will be described later, is supplied to the coal gasification furnace 14 through the char returning line 46 by nitrogen supplied from the air separating apparatus 42. 25 Further, a compressed air 37 discharged from the gas turbine equipment 17, which will be described later, is pressurized by the booster 68 and then is supplied to the coal gasification furnace 14 through the compressed air supplying line 41 together with oxygen supplied from the 30 air separating apparatus 42. [0055] In the coal gasification furnace 14, as the supplied dried coal 101E and char 101F are combusted by the compressed air (oxygen) 37 and the dried coal 101E and the PMHA-13039-PCT 19 char 101F are gasified, it is possible to produce the combustible gas (coal gas) 200 containing carbon monoxide as a main component. Further, the combustible gas 200 is discharged from the coal gasification furnace 14 through 5 the gas producing line 49 and then is fed to the char recovery unit 15. [0056] In the char recovery unit 15, the combustible gas 200 is first supplied to the precipitator 58. Here, the char 101F contained in the combustible gas 200 is separated. 10 Further, the combustible gas 200A from which the char 101F is separated is fed to the gas purification apparatus 16 through the gas discharging line 60. Meanwhile, the char 101F of the fine particle separated from the combustible gas 200 is recycled. That is, the char 101F is deposited 15 in the char supplying hopper 59 and then is returned to the coal gasification furnace 14 through the char returning line 46. [0057] The combustible gas 200 A from which the char 101F is separated by the char recovery unit 15 is purified 20 by removing the sulfur compound, the nitrogen compound or the like contained therein in the gas purification apparatus 16, and then the fuel gas 200B is produced. In the gas turbine equipment 17, when the compressor 61 produces compressed air 40A and then supplies the 25 compressed air 40A to the combustor 62, the combustor 62 produces the combustion gas 202 by mixing and combusting the compressed air 40A supplied from the compressor 61 and the fuel gas 200B supplied from the gas purification apparatus 16. Accordingly, the gas turbine equipment 17 30 drives the turbine 63 by the combustion gas 202, thus it is possible to drive the generator 19 through the rotation shaft 64 and to generate electricity. [0058] Further, the flue gas 203 discharged from the PMHA-13039-PCT 20 turbine 63 in the gas turbine equipment 17 performs heat exchange with the air 40 at the heat recovery steam generator 20 to generate the steam 204, and the generated steam 204 is supplied to the steam turbine equipment 18. 5 In the steam turbine equipment 18, the turbine 69 is driven by the steam 204 supplied from the heat recovery steam generator 20, thus it is possible to drive the generator 19 through the rotation shaft 64 and to generate the electricity. 10 [0059] Then, the harmful materials contained in the flue gas 205 discharged from the heat recovery steam generator 20 are removed in the gas purification apparatus 74, and the purified flue gas 205A is released to the atmosphere from the stack 75. 15 [0060] In addition, the present embodiment utilizes the low-grade coal as the coal fuel, but may utilize a high grade coal. Moreover, the present embodiment is not limited to the coal, but may be biomass to be used as an organic resource derived from a renewable biological 20 substance and may use, for example, thinned timber, scrap timber, driftwoods, grass, a waste substance, sludge, a tire, and a recycle fuel (pellet or chip) which is produced using these as a raw material. Reference Signs List 25 [0061] 10 INTEGRATED COAL GASIFICATION COMBINED CYCLE FACILITY 11 LOW-GRADE COAL SUPPLYING EQUIPMENT 14 COAL GASIFICATION FURNACE 15 CHAR RECOVERY UNIT 30 16 GAS PURIFICATION APPARATUS 17 GAS TURBINE EQUIPMENT 18 STEAM TURBINE EQUIPMENT 19 GENERATOR PMHA-13039-PCT 21 20 HEAT RECOVERY STEAM GENERATOR 50 RAW-COAL FLUIDIZED BED BUNKER 100A, 100B FLUIDIZED BED DRYING FACILITY 101 RAW COAL (LOW-GRADE COAL) 5 101A RAW-COAL FINE PARTICLE 101B RAW-COAL COARSE PARTICLE 101C MILLED COAL 102, 102A, 102B FLUIDIZED BED DRYING APPARATUS 103 HEAT TRANSFER MEMBER (HEATING MEANS) 10 104 GENERATED STEAM 110 COOLING MACHINE A DRYING STEAM (SUPERHEATED STEAM) B CONDENSED WATER