AU2013201145B2 - Flue device of non-condensable gas, integrated gasification combined cycle, and flue method of non-condensable gas - Google Patents

Abstract

Abstract A flue device of a non-condensable gas is provided between a fluidized bed drying device capable of drying wet fuel while causing the wet fuel to flow with fluidized steam and a. fuel-providing device capable of providing the wet fuel to the fluidized bed drying device. the flue device is configured to discharge the non-condensable gas mixed together with the wet fuel provided from the fuel providing device -while the flue device and the fuel providing device are separated and the flue device and the fluidized bed drying device are separated. FLUE DEVICE INTAKE DEVICE L1 44 r-L4 FUEL STORING STEAM STEAM \34 FLUIDIZED BED DRYING DEVICE

Description

1 FLUE DEVICE OF NON-CONDENSABLE GAS, INTEGRATED GASIFICATION COMBINED CYCLE, AND FLUE METHOD OF NON-CONDENSABLE GAS CROSS-REFERENCE TO RELATED APPLICATIONS This application is based upon and claims the benefit of priority from Japanese Patent Application No. 2012 042229 filed February 28, 2012, the entire contents of which are incorporated herein by reference, BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flue device of non condensable gas, an integrated gasification combined cycle, and a flue method of non-condensable gas for discharging non-condensable gas that is mixed when wet fuel such as brown coal is provided. 2. Description of the Related Art In the past, a low-grade coal drying method and a device for providing low-grade coal such as brown coal from a hopper to a dry container and causing the low-grade coal provided into the dry container and drying the low-grade coal using steam is known (for example, see Japanese Patent Application Laid-open No. 61-250096). In this low-grade coal drying device, the steam discharged from the dry container is provided to a partial condensation device, whereby the latent heat of the steam is collected. By the way, in a fluidized bed drying device for causing wet fuel such as brown coal to flow and drying the wet fuel using fluidized steam such as steam, the steam discharged from the fluidized bed drying device may be recompressed and used. At this occasion, when non condensable gas is mixed into the vapor discharged from the fluidized bed drying device, the following phenomenon 2 occurs. As the quality of the recompressed steam becomes lower (quality: the ratio of the vapor-phase steam with respect to the entire quantity of the steam), i.e., as the ratio of the steam in liquid-phase increases, the ratio of 5 steam in the vapor phase decreases, and the ratio of the non-condensable gas increases. As a result, in the low quality steam, the ratio of the non-condensable gas increases, whereby the steam temperature decreases, which makes it difficult to collect latent heat. 10 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 OF THE INVENTION 15 According to a first aspect of the present invention, there is provided a flue device of a non-condensable gas provided between a fluidized bed drying device capable of drying wet fuel while causing the wet fuel to flow with fluidized steam and a fuel-providing device capable of 20 providing the wet fuel to the fluidized bed drying device, wherein the flue device is configured to discharge the non condensable gas mixed together with the wet fuel provided from the fuel-providing device while the flue device and the fuel-providing device are separated and the flue device 25 and the fluidized bed drying device are separated. 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 30 exhaustive sense; that is to say, in the sense of "including, but not limited to".

2a According to a second aspect of the present invention, there is provided an integrated gasification combined cycle including: a fluidized bed drying device for drying wet fuel while causing the wet fuel to flow with fluidized 5 steam; a fuel-providing device for providing the wet fuel to the fluidized bed drying device; the flue device of the non-condensable gas according to any one of claims 1 to 4 provided between the fluidized bed drying device and the fuel-providing device; a gasification furnace for treating 10 the wet fuel that is dried and provided from the fluidized bed drying device so as to convert the wet fuel into 3 gasified gas; a gas turbine for operating with the gasified gas as fuel; a steam -turbine for operating with steam generated by a heat recovery steam generator receiving turbine flue gas from the gas turbine; and an electric power generation device coupled with the gas turbine and the steam turbine. According to a third aspect of the present invention, there is provided a flue method of a non-condensable gas, including: storing provided wet fuel; isolating the wet fuel after the storing; and discharging non-condensable gas mixed with supply of the wet fuel after executing the isolating. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic configuration diagram illustrating an integrated coal gasification combined cycle to which a flue device according to the first embodiment is applied; FIG. 2 is a schematic configuration diagram schematically illustrating the flue device according to the first embodiment; FIG. 3 is a graph concerning quality of drying steam in a conventional fluidized bed drying device; FIG. 4 is a graph concerning quality of drying steam in the fluidized bed drying device according to the first embodiment; FIG. 5 is a schematic configuration diagram schematically illustrating a flue device according to a second embodiment; and FIG. 6 is a schematic configuration diagram schematically illustrating a flue device according to a third embodiment, 4 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS It is an object of embodiments according to the present invention is to provide a flue device of non condensable gas, an integrated gasification combined cycle, and a flue method of non-condensable gas capable of efficiently collecting latent heat of steam by suppressing mixing of non-condensable gas. Hereinafter, a flue device of non-condensable gas, an integrated gasification combined cycle, and a flue method of non-condensable gas according to the present invention will be explained with reference to appended drawings. It should be noted that this invention is not limited by the embodiments explained below. Constituent elements in the embodiments below include those that can be easily replaced by a person skilled in the art or those that are substantially the same as the constituent elements. [First embodiment] FIG. 1 is a schematic configuration diagram illustrating an integrated coal gasification combined cycle to which the flue device according to the first embodiment is applied. An integrated coal gasification combined cycle (IGCC) 100 to which a flue device 8 of the first embodiment is applied employs air combustion method for generating coal gas in a gasification furnace using air as oxidizer, and generates electric power by providing coal gas purified by a gas purification device to gas turbine as fuel gas. More specifically, the integrated coal gasification combined cycle 100 of the first embodiment is electric power generation equipment of air combustion (air blown) method. In this case, brown coal is used as wet fuel provided to the gasification furnace.

5 In the first embodiment, brown coal is applied as wet fuel, but peat such as sludge and low-grade coal including pitch coal and the like may be applied as long as they include a high level of moisture, or high quality coal may also be applied. The wet fuel is not limited to coal such as brown coal, and may be biomass used as renewable biological organic resources, and -for example, thinned woods, discarded woods, driftwoods, grasses, wastes, sludge, tires, and recycled fuel (pellets and chips) made from these materials may also be used. As illustrated in FIG. 1, in the first embodiment, the integrated coal gasification combined cycle 100 includes a coaling device (fuel-providing device) 111, a flue device 8, a fluidized bed drying device 1, a powdered coal device 113, a coal gasification furnace 114, a char recovery device 115, a gas purification device 116, gas turbine 117, steam turbine 118, an electric power generation device 119, and a heat recovery steam generator (HRSG) 120. The coaling device 111 includes a raw coal bunker 121, a coal providing device 122, and a crasher 123. The raw coal bunker 121 is capable of storing brown coal, and drops a predetermined amount of brown coal into the coal providing device 122. The coal providing device 122 uses a conveyer to convey the brown coal dropped by the raw coal bunker 121, and drops the brown coal into the crasher 123. The crasher 123 finely crushes the brown coal that has been dropped and makes them into fine grain. The flue device 8 discharges non-condensable gas that is mixed with the brown coal provided from the coaling device 111. The non-condensable gas is so-called air including nitrogen. The details of the flue device 8 will be explained later.

6 The fluidized bed drying device 1 causes the brown coal fed by the coaling device 111 via the flue device 8 to flow using fluidized steam such as steam, and heats and dries the brown coal using a heat exchanger tube 33, thus removing moisture included in the brown coal. This fluidized bed drying device 1 is connected to a cooling device 131 for cooling the brown coal (dried coal) that has been discharged and dried. The cooling device 131 is connected to a dried coal bunker 132 for storing the dried coal that has been cooled. The fluidized bed drying device 1 is connected to a dried coal cyclone 133 and a dried coal electrostatic precipitator 134, which serve as a dust collection device 139 for separating particles of dried coal from steam discharged to the outside. The particles of dried coal separated from the steam by the dried coal cyclone 133 and the dried coal electrostatic precipitator 134 are stored in the dried coal bunker 132. It should be noted that the steam from which the dried coal is separated by the dried coal electrostatic precipitator 134 is compressed by a steam compression device 135, and is provided to the heat exchanger tube 33 of the fluidized bed drying device 1 as heat medium. The powdered coal device 113 produces powdered coal by crushing the brown coal (dried coal) dried by the fluidized bed drying device 1 into fine particles. More specifically, when the dried coal stored in the dried coal bunker 132 is dropped by a coal providing device 136, the powdered coal device 113 makes the dried coal into powdered coal of which particle size is equal to or less than a predetermined particle size. Then, the powdered coal crushed by the powdered coal device 113 is separated from carrier gas by powdered coal bag filters 137a, 137b, and is stored in powdered coal supply hoppers 138a, 138b.

7 The coal gasification furnace 114 is provided with the powdered coal treated by the powdered coal device 113, and is provided with char (unburned coal) collected by the char recovery device 115. The coal gasification furnace 114 is connected to a compressed air providing line 141 connected from the gas turbine 117 (compression device 161), so that compressed air compressed by this gas turbine 117 can be provided thereto. An air separation device 142 is to separate and generate nitrogen and oxygen from air in the atmosphere. A first nitrogen providing line 143 is connected to the coal gasification furnace 114, and this first nitrogen providing line 143 is connected to a coaling lines 144a, 144b connected from the powdered coal supply hoppers 138a, 138b. A second nitrogen providing line 145 is also connected to the coal gasification furnace 114, and this second nitrogen providing line 145 is connected to a char returning line 146 connected from the char recovery device 115. Further, an oxygen providing line 147 is connected to the compressed air providing line 141. In this case, nitrogen is used as carrier gas for coal and char, and oxygen is used as oxidizer. The coal gasification furnace 114 is, for example, entrained bed gasification furnace. The coal gasification furnace 114 burns and gasifies coal, char, air (oxygen), or steam as gasifying agent provided therein, and combustible gas (produced gas, coal gas) is generated of which main component is carbon dioxide, and gasification reaction occurs using this combustible gas as the gasifying agent. It should be noted that the coal gasification furnace 114 is provided with a foreign object removing device 148 which removes foreign object mixed in powdered coal. In this case, the coal gasification furnace 114 is not limited to B the entrained bed gasification furnace, and may be fluid bed gasification furnace and fixed bed gasification furnace. This coal gasification furnace 114 is provided with a gas generation line 149 for combustible gas to the char recovery device 115, and is capable of discharging the combustible gas including char. In this case, preferably the gas generation line 149 is provided with gas cooling device, so that the combustible gas is cooled to a predetermined temperature and is provided to the char recovery device 115. The char recovery device 115 includes a dust collection device 151 and a supply hopper 152. In this case, the dust collection device 151 includes one or more bag filters and cyclones, and can separate the char included in the combustible gas generated by the coal gasification furnace 114. Then, the combustible gas from which the char is separated is conveyed via a gas discharge line 153 to the gas purification device 116. The supply hopper 152 stores the char separated by the duet collection device 151 from the combustible gas. A bin may be provided ,between the dust collection device 151 and the supply hopper 152, and multiple supply hoppers 152 may be connected to this bin. The char returning line 146 connected from the supply hopper 152 is connected to the second nitrogen providing line 145. The gas purification device 116 performs gas purification by removing impurities such as sulfur compounds and nitrogen compounds from the combustible gas from which char is separated by the char recovery device 115, The gas purification device 116 produces the fuel gas by purifying the combustible gas, and provides this to the gas turbine 117. Since the combustible gas from which char is separated still includes sulfur component (H 2 S), the gas 9 purification device 116 removes it with amine absorption liquid, so that the sulfur component is ultimately collected as gypsum which is effectively made use of. The gas turbine 117 includes a compression device 161, a combustion chamber 162, and a turbine 163. The compression device 161 and the turbine 163 are coupled with a rotation shaft 164. The combustion chamber 162 is connected to a compressed air providing line 165 connected from the compression device 161, and is connected to a fuel gas providing line 166 connected from the gas purification device 116, and the combustion chamber 162 is connected to a combustion gas providing line 167 connected to the turbine 163. The gas turbine 117 is provided with the compressed air providing line 141 extending from the compression device 161 to the coal gasification furnace 114, and a pressurization device 168 is interposed in the compressed air providing line 141. Therefore, the combustion chamber 162 mixes and burns the fuel gas provided from the gas purification device 116 with the compressed air provided from the compression device 161, and the turbine 163 rotates the rotation shaft 164 using the generated combustion gas, and therefore, the combustion chamber 162 can drive the electric power generation device 119. The steam turbine 118 has a turbine 169 coupled with the rotation shaft 164 of the gas turbine 117, and the electric power generation device 119 is connected to a proximal end of this rotation shaft 164. The heat recovery steam generator 120 is provided in a flue gas line 170 connected from the gas turbine 117 (turbine 163), and generates steam by exchanging heat between air and high temperature flue gas. For this reason, the heat recovery steam generator 120 is provided with a steam providing line 10 171 arranged between the heat recovery steam generator 120 and the turbine 169 of the steam turbine 118, and is provided with a steam collecting line 172, and a condensing device 173 is provided in the steam collecting line 172. Therefore, in the steam turbine 118, the turbine 169 is driven by the steam provided from the heat recovery steam generator 120, and by rotating the rotation shaft 164, the electric power generation device 119 can be driven. Further, the flue gas of which heat is collected by the heat recovery steam generator 120 is provided to a gas purifying device 174 where harmful substances are removed therefrom, and the purified flue gas is discharged to the atmosphere through a stack 175. Now, operation of the integrated coal gasification combined cycle 100 of the first embodiment will be explained. The integrated coal gasification combined cycle 100 of the first embodiment is configured such that, in the coaling device 111, raw coal (brown coal) is stored in the raw coal bunker 121, and the brown coal in this raw coal bunker 121 is dropped by the coal providing device 122 into the crasher 123, which crushes the coal into a predetermined size. Then, in the flue device 8, non condensable gas of the crushed brown coal is discharged, and thereafter, the coal is fed into the fluidized bed drying device 1. The brown coal fed therein is heated and dried by the fluidized bed drying device 1, and thereafter, it is cooled by the cooling device 131, and is stored in the dried coal bunker 132. From the steam discharged from the fluidized bed drying device 1, particles of dried coal is separated by the dried coal cyclone 133 and the dried coal electrostatic precipitator 134, and it is compressed by the steam compression device 135, and then it is 11 returned as a heat medium to the heat exchanger tube 33 of the fluidized bed drying device 1. On the other hand, the particles of the dried coal separated from the steam are stored in the dried coal bunker 132. The dried coal stored in the dried coal bunker 132 is fed into the powdered coal device 113 by the coal providing device 136, which crushes the coal into fine particles, thus producing powdered coal, and the powdered coal is stored in the powdered coal supply hoppers 138a, 138b via the powdered coal bag filters 137a, 137b. The powdered coal stored in the powdered coal supply hoppers 138a, 138b is provided to the coal gasification furnace 114 via the first nitrogen providing line 143 with nitrogen provided from the air separation device 142. The char collected by the char recovery device 115 explained later is provided to the coal gasification furnace 114 via the second nitrogen providing line 145 with nitrogen provided from the air separation device 142. Further, after the compressed air bled from the gas turbine 117 explained later is pressurized by the pressurization device 168, it is provided via the compressed air providing line 141 to the coal gasification furnace 114 together with oxygen provided from the air separation device 142. The coal gasification furnace 114 burns the powdered coal and the char thus provided using compressed air (oxygen) to gasify the powdered coal and the char, thus producing combustible gas (coal gas) main component of which is carbon dioxide. Then, this combustible gas is discharged from the coal gasification furnace 114 via the gas generation line 149, and is sent to the char recovery device 115. In this char recovery device 115, first, the combustible gas is provided to the dust collection device 12 151, and the dust collection device 151 separates the char included in the combustible gas. Then, the combustible gas from which the char is separated is conveyed via the gas discharge line 153 to the gas purification device 116. On the other hand, fine particle char separated from the combustible gas is stacked on the supply hopper 152, and is returned via the char returning line 146 back to the coal gasification furnace 114 to be recycled. The gas purification device 116 performs gas purification by removingimpurities such as sulfur compounds and nitrogen compounds from the combustible gas from which char is separated by the char recovery device 115, so that fuel gas is produced. Then, in the gas turbine 117, when the compression device 161 produces compressed air and provides the air to the combustion chamber 162, this combustion chamber 162 mixes and burns the compressed air provided by the compression device 161 and the fuel gas provided from the gas purification device 116, thus producing combustion gas, and by driving the turbine 163 with this combustion gas, the electric power generation device 119 is driven via the rotation shaft 164, and electric power can be generated. Then, the flue gas discharged from the turbine 163 of the gas turbine 117 is subjected to heat exchange with air in the heat recovery steam generator 120, whereby steam is generated, and this generated steam is provided to the steam turbine 118. In the steam turbine 118, the turbine 169 is driven by the steam provided from the heat recovery steam generator 120, and by rotating the rotation shaft 164, the electric power generation device 119 is driven, and electric power can be generated. Thereafter, in the gas purifying device 174, harmful substances are removed from the flue gas discharged from 13 the heat recovery steam generator 120, and the purified flue gas is discharged to the atmosphere through the stack 175. Hereinafter, the flue device 8 provided in the integrated coal gasification combined cycle 100 explained above will be explained in detail. FIG. 2 is a schematic configuration diagram schematically illustrating the flue device according to the first embodiment. The flue device 8 of the first embodiment discharges non-condensable gas mixed with the brown coal fed by the coaling device 111. First, the fluidized bed drying device 1 connected to the flue device '8 will be explained. As illustrated in FIG. 2, the fluidized bed drying device 1 includes a drying furnace 5 receiving the brown coal which is provided therein and a gas dispersion plate 6 provided in the drying furnace 5. The drying furnace 5 is formed in a rectangular box shape. The gas dispersion plate 6 divides the space in the drying furnace 5 into a wind chamber 11 provided at the lower side in the vertical direction (the lower side of the figure) and a drying chamber 12 provided at the upper side in the vertical direction (the upper side of the figure). The gas dispersion plate 6 is formed with many penetrating holes, and fluidized steam is introduced into the wind chamber 11. The drying chamber 12 of the drying furnace 5 includes a brown coal inlet port 31 for feeding brown coal, a dried coal discharge port 34 for discharging dried coal obtained by heating and drying the brown coal, a steam discharge port 35 for discharging fluidized steam and steam generated during drying, and a heat exchanger tube 33 for heating the brown coal. The brown coal inlet port 31 is formed at one end of the drying chamber 12 (the left side of the figure). The 14 brown coal inlet port 31 is connected to the flue device 8, and the brown coal provided by from the coaling device 111 and having passed through the flue device 8 is provided to the drying chamber 12. The dried coal discharge port 34 is formed at the lower portion at the other end of the drying chamber 12 (the right side of the figure). From the dried coal discharge port 34, the brown coal dried in the drying chamber 12 is discharged as the dried coal, and the discharged dried coal is provided to the cooling device 131 explained above. The steam discharge port 35 is formed on the upper surface at the other end of the drying chamber 12. when the brown coal is dried, the steam discharge port 35 discharges the generated steam, which is generated by heating the wet fuel, as well as the fluidized steam provided to the drying chamber 12. The fluidized steam and the generated steam discharged from the steam discharge port 35 is provided to the dust collection device 139 explained above, and thereafter, the fluidized steam and the generated steam discharged from the steam discharge port 35 are provided to the steam compression device 135. The heat exchanger tube 33 is made in a panel form, and provided in a fluidized bed 3. The heat exchanger tube 33 is connected to the outflow side of the steam compression device 135, and the steam compressed by the steam compression device 135 is provided into the tube as drying steam. Accordingly, when the drying steam is provided into the heat exchanger tube 33, the heat exchanger tube 33 makes use of the latent heat of the drying steam to heat the brown coal of the fluidized bed 3, whereby the moisture in the brown coal of the fluidized bed 3 is removed, and the brown coal in the drying chamber 12 15 is dried. Thereafter, the drying steam used for the drying process is discharged to the outside of the drying chamber 12. Therefore, the brown coal provided via the brown coal inlet port 31 to the drying chamber 12 flows with the fluidized steam provided via the gas dispersion plate 6, so that the fluidized bed 3 is formed in the drying chamber 12 and a freeboard portion F is formed above the fluidized bed 3. The direction of flow of the fluidized bed 3 formed in the drying chamber 12 is a direction from one end to the other end of the drying chamber 12. Then, the brown coal made into the fluidized bed 3 is heated by the heat exchanger tube 33, whereby the moisture included in the brown coal is made into generated steam, and is discharged from the steam discharge port 35 together with the fluidized steam. In the steam discharged from the steam discharge port 35, particles of the dried coal included in the steam is collected by the dust collection device 139, and thereafter, it is provided to the steam compression device 135, and the steam compression device 135 compresses the steam so that the temperature thereof is increased. The steam of which temperature is increased is provided as the drying steam to the heat exchanger tube 33, and the brown coal is heated using the latent heat. The flue device 8 is provided between the coaling device 111 and the fluidized bed drying device 1. The flue device 8 includes a fuel storing hopper (fuel storing unit) 41 for storing the brown coal provided from the coaling device 111. One end of the fuel storing hopper 41 (the upper side of the figure) is connected via a first fuel providing line Li to the coaling device 111, and the other end of the fuel storing hopper 41 (the lower side of the figure) is connected via a second fuel-providing line L2 to 16 the fluidized bed drying device 1. The flue device 8 includes a first rotary feeder 44 interposed in the first fuel-providing line Li and a second rotary feeder 45 interposed in the second fuel-providing line L2. When activated, the first rotary feeder 44 provides the brown fuel from the coaling device 111 to the fuel storing hopper 41. On the other hand, when deactivated, the first rotary feeder 44 closes the first fuel-providing line Li, and functions as a partition unit for separating between the coaling device I11 and the fuel storing hopper 41. Likewise, when activated, the second rotary feeder 45 provides the brown fuel from the fuel storing hopper 41 to the fluidized bed drying device 1. On the other hand, when deactivated, the second rotary feeder 45 closes the second fuel-providing line L2, and functions as a partition unit for separating between the fuel storing hopper 41 and the fluidized bed drying device 1. Sealing property is not required for the separation achieved with the first rotary feeder 44 and the second rotary feeder 45. The lower portion of the fuel storing hopper 41 is connected to a steam providing line (steam supply unit) L3, and the upper portion thereof is connected to a gas discharge line (gas discharge unit) L4. The steam providing line L3 provides steam to the inside of the fuel storing hopper 41. The steam provided to the steam providing line L3 is, for example, provided from an external auxiliary steam providing device, Steam of which concentration of non-condensable gas decreases in the drying furnace 5 after operation for a predetermined period of time may be partially bled and provided from the outlet of a compression device 135. The gas discharge line L4 can discharge non-condensable gas such as nitrogen in the fuel storing hopper 41. More specifically, the gas discharge 17 line L4 discharges the non-condensable gas in the fuel storing hopper 41 in-accordance with the amount of steam provided to the fuel storing hopper 41 with the steam providing line L3. Further, steam providing line 13, and gas discharge line L4 function as a gas flue unit which discharges the non-condensable gas in the fuel storing hopper 41. The non-condensable gas discharged from the gas discharge line L4 is effectively made use of as various kinds of heat sources. Therefore, in the flue device 8 configured as described above stops operation of the second rotary feeder 45 and on the other hand activates the first rotary feeder 44, whereby the brown coal is provided from the coaling device 111 to the fuel storing hopper 41. The provided brown coal is stored to the fuel storing hopper 41 (fuel storing step). Thereafter, the flue device 8 stops operation of the first rotary feeder 44 and the second rotary feeder 45, so that the first fuel-providing line Li and the second fuel-providing line L2 are separated, whereby the brown coal in the fuel storing hopper 41 is isolated (fuel isolation step), Then, the steam is provided from the steam providing line 13 to the fuel storing hopper 41. At this occasion, in the fuel storing hopper 41, the non-condensable gas therein is discharged from the gas discharge line L4, and the non-condensable gas therein is filled with the steam. For this reason, the steam is filled in the fuel storing hopper 41, whereby the non-condensable gas is replaced with the steam, and accordingly, the non-condensable gas in the fuel storing hopper 41 is discharged (flue step). At this occasion, when the steam passes through the stean providing line L3 and is provided to the fuel storing hopper 41, the brown coal stored in the fuel storing hopper 41 is preheated 18 while it flows with the steam. Thereafter, a flue device 200 activates the second rotary feeder 45, and the brown coal is provided from the fuel storing hopper 41 to the fluidized bed drying device 1. Subsequently, with reference to FIGS. 3 and 4, the quality of drying steam flowing in the heat exchanger tube 33 of a conventional fluidized bed drying device 1 not connected to the flue device 8 and the quality of the drying steam flowing in the heat exchanger tube 33 of the fluidized bed drying device 1 of the first embodiment connected to the flue device 8 are compared. FIG. 3 is a graph concerning the quality of the drying steam in the conventional fluidized bed drying device. FIG. 4 is a graph concerning the quality of the drying steam in the fluidized bed drying device according to the first embodiment. In the graph as illustrated in FIGS. 3 and 4, the horizontal axis denotes the quality of the drying steam, and the vertical axis denotes the temperature of the drying steam. The quality is the ratio of the steam in the ratio of the vapor-phase steam with respect to the entire quantity of the steam, and the lower the quality is, the lower the ratio of the steam of the vapor-phase is, the higher the ratio of the steam of the liquid-phase is. In the graph of FIG. 3, the flue device B is not connected, and therefore, the ratio of the mixed non condensable gas included in the atmosphere in the drying furnace 5 is 5 wt%. On the other hand, in the graph of FIG. 4, the flue device 8 is connected, and therefore, the ratio of the mixed non-condensable gas included in the atmosphere in the drying furnace 5 is 1 wt%. At this occasion, in FIGS. 3 and 4, the pressure of the atmosphere in the drying furnace 5 is 0.1 MPa, and the dew-point temperature Ti in 19 the drying furnace 5 is around 100 degrees Celsius. Since the dew-point temperature Ti in the drying furnace 5 is around 100 degrees Celsius, a temperature T2 of the drying steam provided to the heat exchanger tube 33 is equal to or more than 100 degrees Celsius, and the difference of the temperature between the dew-point temperature Ti and the temperature T2 of the drying steam (heat exchanger tube 33) is a predetermined temperature difference AT. In FIG. 3, the steam discharged from the drying furnace 5 is recompressed by the steam compression device 135 and is provided to the heat exchanger tube 33, and therefore, the ratio of the mixed non-condensable gas included in the drying steam flowing through the heat exchanger tube 33 is 5 wt%. Likewise, in FIG. 4, the steam discharged from the drying furnace 5 is recompressed by the steam compression device 135 and is provided to the heat exchanger tube 33, and therefore, the ratio of the mixed non-condensable gas included in the drying steam flowing through the heat exchanger tube 33 is 1 wt%. At this occasion, the pressure in the heat exchanger tube 33 through which the drying steam of FIGS. 3 and 4 flows is 0.49 MPa. As illustrated in FIG. 3, in the conventional fluidized bed drying device 1, the ratio of the mixed non condensable gas of the drying steam is high, and therefore, when the quality of the drying steam provided to the heat exchanger tube 33 is less than 0.2, the ratio of the non condensable gas in the vapor-phase of the drying steam increases. Therefore, the temperature T2 of the drying steam in the low quality region rapidly decreases, and the temperature difference AT also decreases, and it becomes difficult to collect the latent heat. Therefore, in the 20 conventional fluidized bed drying device 1, it is difficult to use drying steam of which quality is less than 0.2. On the other hand, as illustrated in FIG. 4, in the fluidized bed drying device 1 of the first embodiment, the ratio of the mixed non-condens'able gas of the drying steam is low, and therefore, even when the quality of the drying steam provided to the heat exchanger tube 33 is less than 0.2, the ratio of the non-condensable gas in the vapor phase of the drying steam is less than the conventional one. Therefore, the temperature T2 of the drying steam does not decrease rapidly, and the temperature difference AT can be ensured, and therefore, the fluidized bed drying device 1 of the first embodiment can use drying steam of lower quality than the conventional one. In the fluidized bed drying device 1 of the first embodiment, when the quality of the drying steam is equal to or more than 0.1, the reduction of the temperature T2 of the drying steam can be suppressed, and the latent heat of the drying steam can be collected efficiently. As described above, according to the configuration of the first embodiment, the flue device 8 can discharge the non-condensable gas mixed together with the brown coal, while the first fuel-providing line L1 and the second fuel providing line L2 are separated. Therefore, the flue device 8 can provide the brown coal to the fluidized bed drying device 1 while suppressing mixing of the non condensable gas. Accordingly, the steam discharged from the fluidized bed drying device 1 includes a lower amount of mixed non-condensable gas, and therefore, even when the recompressed drying steam is of low quality, the reduction of the temperature of the drying steam can be suppressed, and the latent heat of the drying steam can be collected efficiently.

21 According to the configuration of the first embodiment, the flue device 8 can preheat the brown coal stored in the fuel storing hopper 41 using the steam provided from the steam providing line L3. Therefore, since the preheated brown coal can be provided to the fluidized bed drying device 1, recondensation of the steam can be suppressed at the providing side of the fluidized bed drying device 1, and it is also possible to suppress condensation of the brown coal due to flocculated water and occurrence of fluidization failure. According to the configuration of the first embodiment, the flue device 8 stores the brown coal to the fuel storing hopper 41, and while the first fuel-providing line Li and the second fuel-providing line L2 are separated by the first rotary feeder 44 and the second rotary feeder 45, respectively, the steam is provided from the steam providing line L3 to the fuel storing hopper 41, and the non-condensable gas in the fuel storing hopper 41 is discharged from the gas discharge line L4, whereby the non condensable gas in the fuel storing hopper 41 can be discharged in a preferable manner. [Second embodiment] Subsequently, a flue device 200 according to the second embodiment will be explained with reference to FIG, 5, FIG. 5 is a schematic configuration diagram schematically illustrating the flue device according to the second embodiment. In the second embodiment, in order to avoid repeated description, portions different from the first embodiment will be explained, and the same reference numerals will be attached to the portions having the same configuration as the first embodiment. In the flue device 200 according to the second embodiment, an intake device (gas intake unit) 201 is interposed in the gas discharge - 22 line 14 of the first embodiment. Hereinafter, the flue device 200 according to the second embodiment will be explained. In the flue device 200 of the second embodiment, the intake device 201 interposed in the gas discharge line L4 sucks the non-condensable gas in the fuel storing hopper 41, and discharges the sucked non-condensable gas to the outside of the fuel storing hopper 41. The steam providing line L3, the atmosphere discharge line L4, and the intake device 201 function as a gas flue unit which discharges the non-condensable gas in the fuel storing hopper 41. Therefore, the flue device 200 configured as described above stops operation of the second rotary feeder 45 and on the other hand activates the first rotary feeder 44, whereby the brown coal is provided from the coaling device 111 to the fuel storing hopper 41. The provided brown coal is stored to the fuel storing,hopper 41 (fuel storing step). Thereafter, the flue device 200 stops operation of the first rotary feeder 44 and the second rotary feeder 45, so that the first fuel-providing line Li and the second fuel providing line L2 are separated, whereby the brown coal in the fuel storing hopper 41 is isolated (fuel isolation step). In this state, the intake device 201 sucks the non condensable gas in the fuel storing hopper 41, so that the non-condensable gas in the fuel storing hopper 41 is discharged via the gas discharge line L4 (flue step). When the intake device 201 sucks the non-condensable gas in the fuel storing hopper 41, the pressure in the inside of the fuel storing hopper 41 is negative. Therefore, the steam is provided from the steam providing line L3 to the fuel storing hopper 41, and the pressure of the fuel storing hopper 41 and the pressure of the fluidized bed drying device 1 is caused to be the same, 23 whereby the brown coal in the fuel storing hopper 41 can be provided to the fluidized bed drying device 1. In the fuel storing hopper 41, the non-condensable gas therein is filled with the steam. Accordingly, the flue device 200 oan suppress flow of the non-condensable gas to the fuel storing hopper 41. Thereafter, the flue device 200 activates the second rotary feeder 45, and the brown coal is provided from the fuel storing hopper 41 to the fluidized bed drying device 1. As described above, according to the configuration of the second embodiment, the flue device 200 can also discharge the non-condensable gas mixed together 'with the brown coal, while the first fuel-providing line Ll and the second fuel-providing line L2 are separated. Accordingly, the flue device 200 can suppress mixing of the non condensable gas, and even when the recompressed drying steam is of low quality, the reduction of the temperature of the drying steam can be suppressed, and the latent heat of the drying steam can be collected efficiently. According to the configuration of the second embodiment, the flue device 200 stores the brown coal to the fuel storing hopper 41, and while the first fuel providing line Ll and the second fuel-providing line L2 are separated by the first rotary feeder 44 and the second rotary feeder 45, respectively, the non-condensable gas in the fuel storing hopper 41 is sucked by the intake device 201 from the gas discharge line L4, and thereafter, the steam is provided from the steam providing line L3 to the fuel storing hopper 41, whereby the non-condensable gas in the fuel storing hopper 41 can be discharged in a preferable manner.

24 In the second embodiment, the first rotary feeder 44 and the second rotary feeder 45 may have a high degree of sealing.property. [Third embodiment] Subsequently, a flue device 210 according to the third embodiment will be explained with reference to FIG. 6. FIG. 6 is a schematic configuration diagram schematically illustrating a flue device according to the third embodiment. In the third embodiment, in order to avoid repeated description, portions different from the second embodiment will be explained, and the same reference numerals will be attached to the portions having the same configuration as the second embodiment. In the flue device 200 according to the second embodiment, the intake device 201 is interposed in the gas discharge line L4 of the first embodiment. In a flue device 210 according to the third embodiment, the steam providing line 13 is abolished, and a first ball valve 211 and a second ball valve 212 are provided instead of the first rotary feeder 44 and the second rotary feeder 45. Hereinafter, the flue device 210 according to the third embodiment will be explained. In the flue device 210 of the third embodiment the first ball valve 211 and the second ball valve 212 (partition unit) are some kinds of open/close valves, and when opened, they allow flow of brown coal in the first fuel-providing line L1 and the second fuel-providing line L2. On the other hand, when the first ball valve 211 and the second ball valve 212 are closed, the first ball valve 211 and the second ball valve 212 shut the first fuel providing line L1 and the second fuel-providing line L2. Accordingly, when the first ball valve 211 and the second ball valve 212 are closed, the first fuel-providing line L1 25 and the second fuel-providing line L2 can be separated, and the brown coal in the fuel storing hopper 41 can be isolated. At this occasion, the first ball valve 211 and the second ball valve 212 may be of a high degree of sealing property. The intake device 201 is the same as that of the second embodiment, and description thereabout is omitted. The gas discharge line L4 and the intake device 201 function as the gas flue unit for discharging the non-condensable gas in the fuel storing hopper 41. Therefore, in the flue device 210 configured as described above, the second ball valve 212 is closed, and on the other hand, the first ball valve 211 is opened, so that the brown coal is provided from the coaling device 111 to the fuel storing hopper 41. The provided brown coal is stored to the fuel storing hopper 41 (fuel storing step). Thereafter, the first ball valve 211 and the second ball valve 212 are closed, the flue device 210 separates the first fuel-providing line L1 and the second fuel-providing line L2, and the brown coal in the fuel storing hopper 41 is isolated (fuel isolation step). In this state, the intake device 201 sucks the non-condensable gas in the fuel storing hopper 41, so that the non-condensable gas in the fuel storing hopper 41 is discharged via the gas discharge line L4 (flue step). Thereafter, when the second ball valve 212 is opened, the flue device 210 provides the brown coal from the fuel storing hopper 41 to the fluidized bed drying device 1. As described above, according to the configuration of the third embodiment, the flue device 210 can also discharge the non-condensable gas mixed together with the brown coal, while the first fuel-providing line L1 and the second fuel-providing line L2 are separated. Accordingly, the flue device 210 can suppress mixing of the non- 26 condensable gas, and even when the recompressed drying steam is of low quality, the reduction of the temperature of the drying steam can be suppressed, and the latent heat of the drying steam can be collected efficiently. According to the configuration of the third embodiment, the flue device 210 stores the brown coal to the fuel storing hopper 41, and while the first fuel-providing line Li and the second fuel-providing line L2 are separated by the first ball valve 211 and the second ball valve 212, respectively, the non-condensable gas in the fuel storing hopper 41 is sucked by the intake device 201 from the gas discharge line L4, whereby the non-condensable gas in the fuel storing hopper 41 can be discharged in a preferable manner. The flue devices 8, 200, 210 of the first to the third embodiments use the first rotary feeder 44 and the second rotary feeder 45 or the first ball valve 211 and the second ball valve 212 as multiple partition units, but the configuration is not limited thereto. More specifically, anything may be employed as long as it separates the first fuel-providing line LI and the second fuel-providing line L2 and allows flow of brown coal in the first fuel providing line L and the second fuel-providing line L2. According to the configuration of the embodiment, the flue device can discharge the non-condensable gas mixed together with the wet fuel while the flue device and the fuel-providing device are separated and the flue device and the fluidized bed drying device are separated. Therefore, the flue device can provide the brown coal to the fluidized bed drying device while suppressing mixing of the non condensable gas. Accordingly, the steam discharged from the fluidized bed drying device includes a lower amount of mixed non-condensable gas. Therefore, when the steam 27 discharged from the fluidized bed drying device is recompressed, and the recompressed steam is used, the ratio of the steam of the vapor-phase is less likely to decrease even when the steam is of low quality, and accordingly, the reduction of the steam temperature can be suppressed, and the latent heat of the steam can be collected efficiently. According to the configuration of the embodiment, the fuel storing unit can store the wet fuel, and the gas flue unit can discharge the non-condensable gas by discharging the non-condensable gas in the fuel storing unit in a preferable manner while each partition unit separates between the fuel-providing device and the fuel storing unit and between the fuel storing unit and the fluidized bed drying device. According to the configuration of the embodiment, the steam supply unit provides steam into the fuel storing unit, and the non-condensable gas in the fuel storing unit is discharged from the gas discharge unit, so that the non condensable gas in the fuel storing unit can be filled with the steam. Accordingly, the non-condensable gas in the fuel storing unit can be replaced with the steam, and therefore, the non-condensable gas can be discharged in a preferable manner. Further, the wet fuel stored in the fuel storing unit can be preheated with the provided steam. Therefore, the preheated wet fuel can be provided to the fluidized bed drying device, and accordingly, recondensation of the steam can be suppressed at the providing side of the fluidized bed drying device, and it is also possible to suppress condensation of the brown coal due to flocculated water and occurrence of fluidization failure. According to the configuration of the embodiment, the gas intake unit can suck the non-condensable gas in the 28 fuel storing unit. Accordingly, the non-condensable gas in the fuel storing unit can be forcibly discharged. According to the configuration of the embodiment, the flue device can discharge the non-condensable gas, and therefore, the flue device can provide the brown coal to the fluidized bed drying device in a preferable manner while suppressing mixing of the non-condensable gas to the fluidized bed drying device. Therefore, the wet fuel flowing and dried in the fluidized bed drying device in a preferable manner can be provided to the gasification furnace. According to the configuration of the embodiment, by executing the fuel isolation step and the flue step, the non-condensable gas mixed with supply of the wet fuel can be discharged while the wet fuel is isolated in the fuel storing unit. Therefore, the flue device can provide the brown coal to the fluidized bed drying device while suppressing mixing of the non-condensable gas. Accordingly, the steam discharged from the fluidized bed drying device includes a lower amount of mixed non-condensable gas. Therefore, when the steam discharged from the fluidized bed drying device is recompressed, and the recompressed steam is used, the ratio of the steam of the vapor-phase is less likely to decrease even when the steam is of low quality, and accordingly, the reduction of the steam temperature can be suppressed, and the latent heat of the steam can be collected efficiently. According to the flue device of the non-condensable gas and the flue method of the non-condensable gas of the present invention, by suppressing mixing of the non condensable gas into the fluidized bed drying device, the steam discharged from the fluidized bed drying device includes a lower amount of mixed non-condensable gas, and, 29 therefore, the reduction of the temperature of the reoompressed steam can be suppressed, and the latent heat of the recompressed steam can be collected efficiently.

Claims (8)

1. A flue device of a non-condonsable gas provided between a fluidized bed drying device capable of drying wet fuel while causing the wet fuel to flow with fluidized steam and a fuel-providing device capable of providing the wet fuel to the fluidized bed drying device, wherein the flue device is configured to discharge the non-condensable gas mixed together with the wet fuel provided from the fuel-providing device while the flue device and the fuel-providing device are separated and the flue device and the fluidized bed drying device are separated.

2. The flue device of the non-condensable gas according to claim 1 comprising: a fuel storing unit for storing the wet fuel provided from the fuel-providing device; a plurality of partition units provided between the fuel-providing device and the fuel storing unit and between the fuel storing unit and the fluidized bed drying device; and a gas flue unit for discharging the non-condensable gas in the fuel storing unit.

3. The flue device of the non-condensable gas according to claim 2, wherein the gas flue unit includes: a steam supply unit for providing steam into the fuel storing unit and a gas discharge unit for discharging the non condensable gas in the fuel storing unit. 31

4. The flue device of the non-condensable gas according to claim 2 or 3, wherein the gas flue unit includes a gas intake unit for sucking the non-condensable gas in the fuel storing 5 unit.

5. An integrated gasification combined cycle comprising: a fluidized bed drying device for drying wet fuel while causing the wet fuel to flow with fluidized steam; a fuel-providing device for providing the wet fuel to 10 the fluidized bed drying device; the flue device of the non-condensable gas according to any one of claims 1 to 4 provided between the fluidized bed drying device and the fuel-providing device; a gasification furnace for treating the wet fuel that 15 is dried and provided from the fluidized bed drying device so as to convert the wet fuel into gasified gas; a gas turbine for operating with the gasified gas as fuel; a steam turbine for operating with steam generated by 20 a heat recovery steam generator receiving turbine flue gas from the gas turbine; and an electric power generation device coupled with the gas turbine and the steam turbine.

6. A flue device substantially as herein described with 25 reference to any one of the embodiments of the invention illustrated in the accompanying drawings and/or examples.

7. An integrated gasification combined cycle substantially as herein described with reference to any one of the embodiments of the invention illustrated in the 30 accompanying drawings and/or examples. 32

8. A flue method substantially as herein described with reference to any one of the embodiments of the invention illustrated in the accompanying drawings and/or examples.