JP5822504B2 - Fluidized bed drying equipment - Google Patents

Description

  The present invention relates to a fluidized bed drying facility including a fluidized bed drying device that dries while flowing a wet raw material.

  For example, a combined coal gasification power generation facility is a power generation facility that aims to further increase the efficiency and environmental performance compared to conventional coal-fired power generation by gasifying coal and combining it with combined cycle power generation. This coal gasification combined power generation facility is also known to be able to use coal with abundant resources, and it is known that the applicable coal types can be expanded.

In such a coal gasification combined power generation facility, when brown coal (wet raw material) is used as a fuel, a large amount of water is brought into the gasification furnace, and the temperature inside the gasification furnace decreases due to the latent heat of vaporization of the water. 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 1.

JP 2008-89243 A

  By the way, the fluidized bed drying apparatus discharges the steam and fluidized gas generated when the wet raw material is dried while supplying 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.

  Then, this invention makes it a subject to provide the fluidized-bed drying equipment which can remove dust efficiently from the generated steam discharged | emitted from a fluidized-bed drying apparatus.

  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 section of the fluidized bed drying device to the outside, and is interposed in the generated steam line, 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.

  With the above-described configuration, the fluidized bed drying facility can efficiently remove dust from the generated steam discharged from the fluidized bed drying apparatus.

  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.

  Moreover, it is preferable to further comprise 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.

  Moreover, it is preferable to further comprise 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 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 view showing an embodiment of a combined coal gasification combined power generation system to which the fluidized bed drying facility of this embodiment is applied. FIG. 2 is a schematic view showing an embodiment of a fluidized bed drying facility including the fluidized bed drying apparatus shown in FIG. FIG. 3 is a schematic view showing an embodiment of the fluidized bed drying apparatus shown in FIG. FIG. 4 is a schematic view showing another embodiment of a fluidized bed drying facility equipped with a fluidized bed drying apparatus.

  Hereinafter, the present invention will be described in detail with reference to the drawings. It should be noted that the present invention is not limited by the modes for carrying out the invention (hereinafter referred to as embodiments). In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art and those that are substantially the same. Although this embodiment demonstrates the example which applied the fluidized-bed drying equipment based on this invention to a coal gasification combined cycle power generation system, the application object of this invention is not limited to a coal gasification combined cycle power generation system. 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 cooking boiler that obtains output. Even when the present invention is applied to a coal gasification combined power generation system, the method is not limited. Moreover, although this embodiment demonstrates by the case where lignite is used as a wet raw material (to-be-dried material), what is necessary is just a thing with a high water content, and low grade coal containing subbituminous coal etc., sludge, etc. may be used. it can.

  FIG. 1 is a schematic diagram illustrating an example of a combined coal gasification combined power generation system to which the fluidized bed drying facility of the present embodiment is applied. FIG. 2 is a schematic diagram illustrating an example of fluidized bed drying equipment including the fluidized bed drying apparatus illustrated in FIG. 1.

As shown in FIG. 1, an integrated coal gasification combined cycle (IGCC) system 10 includes a fluidized bed drying facility 100 that dries lignite 132 that is fuel to produce product coal 140, and product coal 140. A mill 20 that is pulverized into pulverized coal 40, a coal gasification furnace 13 that processes the pulverized coal 40 and converts it to gasified gas 42, and a gas turbine (GT) 14 that is operated using the gasified gas 42 as fuel. A heat recovery steam generator (HRSG) 16 that introduces turbine exhaust gas 46 from the gas turbine 14, a steam turbine (ST) 18 that is operated by the steam 48 generated in the exhaust heat recovery boiler 16, and Gas turbine 14 and / or steam turbine 1 8 and a generator (G) 19 connected to the generator 8. The combined coal gasification combined power generation system 10 is connected to the condenser 34 that condenses the steam discharged from the steam turbine 18 and returns the steam to the exhaust heat recovery boiler 16, and is connected to the gas turbine 14 and rotates together with the gas turbine 14. , 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 36 flows, and nitrogen is supplied from the mill 20. An air separation unit (ASU) 38 that supplies the transport path of the pulverized coal 40 transported to the coal gasification furnace 13. Note that the air 54 compressed by the compressor 36 is supplied to the coal gasifier 13 and the combustor 26.

  The combined coal gasification combined power generation system 10 produces lignite coal 132 by drying the lignite coal 132 in the fluidized bed drying facility 100, and pulverized coal 40 obtained by pulverizing the product coal 140 in the mill 20 is gasified in the coal gasifier 13. Gasification gas 42 which is a product gas is obtained. The coal gasification combined cycle power generation system 10 removes the gasified gas 42 by the cyclone 22 and the gas purification device 24 and purifies the gas, and then supplies the gasified gas 42 to the combustor 26 of the gas turbine 14 that is a power generation means. Generate high-pressure combustion gas 50 The coal gasification combined power generation system 10 drives the gas turbine 14 with the combustion gas 50. In the coal gasification combined power generation system 10, the gas turbine 14 is connected to the generator 19, and the generator 19 generates electric power by driving the gas turbine 14. Here, the turbine exhaust gas 46 after driving the gas turbine 14 still has a temperature of about 500 to 600 ° C. The combined coal gasification combined power generation system 10 sends the turbine exhaust gas 46 to the exhaust heat recovery boiler (HRSG) 16, and recovers the thermal energy of the turbine exhaust gas 46 by the exhaust heat recovery boiler (HRSG) 16. The combined coal gasification combined power generation system 10 generates steam 48 by heat energy recovered from the turbine exhaust gas 46 by an exhaust heat recovery boiler (HRSG) 16, and drives the steam turbine 18 by the steam 48. The combined coal gasification combined power generation system 10 removes NOx and SOx components from the exhaust gas 52, which is the gas from which the thermal energy is recovered from the turbine exhaust gas 46 by the exhaust heat recovery boiler (HRSG) 16, and then the chimney 32. Through the atmosphere.

  Hereinafter, the fluidized bed drying facility 100 will be described with reference to FIG. As shown in FIG. 2, the fluidized bed drying facility 100 includes a supply hopper 101 that supplies lignite 132 having a high water content, which is one of wet raw materials, and fluidized bed drying that dries the supplied lignite 132. A cooling trap 103 that cools the apparatus 102, the generated steam 134 that is discharged from the fluidized bed drying apparatus 102, removes dust in the generated steam 134, and a superheater 104 that superheats the generated steam 135 a cooled by the cooling trap 103. A branch part 105 for branching the generated steam 135b superheated by the superheating means 104, a cooler 110 for cooling the dried lignite 138 extracted from the fluidized bed drying apparatus 102 to produce product charcoal 140, and a branch part 105 Recovery system 111 for recovering the heat of the generated steam 135b, and the generated steam 1 whose heat is recovered by the heat recovery system 111 Comprising 5b and water treatment unit 112 for discharging the waste water 142 to process, the fluidized bed dryer 102 to supply the circulation device 114 as a fluidizing steam 136 circulate generating steam 135b branched by the branching unit 105, a.

Further, the fluidized bed drying facility 100 serves as a pipe connecting the respective parts, and a generated steam line L ₁ that discharges the generated steam 134 generated when drying the lignite 132 to the outside of the fluidized bed drying apparatus 102 and guides it to the branching section 105. And a line branched by the branching part 105, which is generated by cooling the line L ₂ supplied into the fluidized bed drying apparatus 102 as fluidized steam (fluidized gas) 136 and the dried lignite 138 with the cooler 110. It includes a product line _{L 3} for discharging the product coal 140.

  Supply hopper 101 is a facility for storing lignite 132. The supply hopper 101 supplies the stored lignite 132 into the fluidized bed drying apparatus 102.

  The fluidized bed drying apparatus 102 forms a fluidized bed with the lignite 132 supplied from the supply hopper 101 and the fluidized steam 136 and moves the lignite 132 while heating the lignite 132 by heating means to dry the dried lignite 138. And In the fluidized bed drying apparatus 102, the fluidized steam 136 and the steam generated when the lignite 132 is dried are mixed into the generated steam 134. The fluidized bed drying apparatus 102 includes a heat transfer member 128 as a heating means provided therein, a superheated steam supply device (high temperature gas supply means) 129 capable of supplying superheated steam (high temperature gas) A to the heat transfer member 128, and .

  Next, the fluidized bed drying apparatus 102 will be described with reference to FIG. Here, FIG. 3 is a schematic view showing an embodiment of the fluidized bed drying apparatus shown in FIG. FIG. 3 also shows a schematic configuration of the cooling trap 103 and the superheating means 104 in addition to the fluidized bed drying apparatus 102.

  The fluidized bed drying apparatus 102 includes a drying container 120 into which the lignite 132 is charged, a charging unit (inlet) 122 into which the lignite 132 is charged, and a discharge unit that discharges the dry lignite 138 from which the lignite 132 has been dried ( Discharge port) 123, a gas dispersion plate 124 provided inside the drying container 120, a fluidized gas supply unit (fluidized gas supply port) 126 that supplies the fluidizing gas 136 to the drying container 120, and generated steam 134. A steam discharge part (steam discharge port) 127 for discharging the steam. In addition, as described above, the fluidized bed drying apparatus 102 includes a heat transfer member 128 serving as a heating unit provided inside, and a superheated steam supply device (a high-temperature gas) A that can supply the superheated steam (high-temperature gas) A to the heat transfer member 128 ( High temperature gas supply means) 129 (see FIG. 2).

  The drying container 120 is divided into a drying chamber 150 located on the upper side in the vertical direction (upper side in the drawing) and a chamber chamber 152 located on the lower side in the vertical direction (lower side in the drawing) by the gas dispersion plate 124. Yes. The drying chamber 150 is a region to which the lignite 132 is supplied, and the chamber chamber 152 is a region to which the fluidizing gas 136 is supplied. In the drying container 120, the fluidized gas 136 supplied to the chamber chamber 152 passes through the gas dispersion plate 124 and is supplied to the drying chamber 150. In the drying chamber 150, the fluidized gas 155 is moved by the fluidizing gas 136, whereby the fluidized bed 155 is formed.

  The charging unit 122 is connected to one end of the drying chamber 150 of the drying container 120. The input unit 122 is connected to the supply hopper 101 and inputs the lignite 132 supplied from the supply hopper 101 into the drying chamber 150 at one end. The discharge unit 123 is connected to the lower side in the vertical direction of the other end of the drying chamber 150 of the drying container 120, that is, in the vicinity of the gas dispersion plate 124. The discharge unit 123 is connected to a pipe connected to the cooler 110 and discharges the dry lignite 138 in the drying chamber 150 to the pipe.

The gas dispersion plate 124 has a large number of through holes 124a. The gas dispersion plate 124 allows the gas to flow between the drying chamber 150 and the chamber chamber 152 while suppressing the lignite 132 in the drying chamber 150 from falling into the chamber chamber 152. The fluidizing gas supply unit 126 is connected to the chamber chamber 152 and supplies the fluidizing gas 136 supplied from the line L ₂ into the chamber chamber 152. The steam discharge unit 127 is connected to the upper surface of the drying chamber 150. Steam discharge portion 127 guides the steam generated 134 in the drying vessel 120 to generate steam line _{L 1.}

  Here, the fluidized bed drying apparatus 102 includes a plurality of, in the present embodiment, divided plates 154 disposed inside the drying chamber 150. In this embodiment, the number of divided plates is four. However, the number of divided plates is not limited to this, and the number of divided plates is the most suitable. The dividing plate 154 is a plate extending in the width direction and the vertical direction of the drying container 120, and a surface orthogonal to a line connecting the input unit 122 and the discharge unit 123 is the front surface (surface having the largest area). It is. As shown in FIG. 3, the split plate 154 has a lower end in the vertical direction in contact with the gas dispersion plate 124, and an upper end in the vertical direction is positioned below the upper end of the fluidized bed 155. Further, the dividing plate 154 is disposed in the entire drying chamber 150. Further, the plurality of divided plates 154 are arranged at a predetermined interval in the direction from the input unit 122 to the discharge unit 123. Thereby, the fluidized bed drying apparatus 102 is divided into a plurality of drying compartments 150a, 150b, 150c, 150d, and 150e in the direction from the input unit 122 to the discharge unit 123 in the drying chamber 150 of the drying container 120 by the plurality of dividing plates 154. Divided. The drying compartments 150a, 150b, 150c, 150d, and 150e are arranged in the order of the drying compartment 150a, the drying compartment 150b, the drying compartment 150c, the drying compartment 150d, and the drying compartment 150e from the input unit 122 to the discharge unit 123. ing. The chamber chamber 152 is also divided into five chamber compartments 152a, 152b, 152c, 152d, and 152e corresponding to the dry compartments 150a, 150b, 150c, 150d, and 150e.

  Five fluidizing gas supply units 126 are provided corresponding to the chamber compartments 152a, 152b, 152c, 152d, and 152e, and the fluidizing gas 136 is provided in each of the chamber compartments 152a, 152b, 152c, 152d, and 152e. Supply. The heat transfer member 128 is arranged in a direction extending in the width direction in each fluidized bed 155 of the drying compartments 150a, 150b, 150c, 150d, and 150e.

  In the fluidized bed drying apparatus 102, lignite 132 is charged into the drying compartment 150a of the drying container 120 by the supply hopper 101, and fluidized steam 136 is introduced into the chamber compartment 152a. The fluidized steam 136 introduced into the chamber chamber 152a passes through the through holes 124a of the gas dispersion plate 124 and flows into the drying compartment 150a. The fluidized steam 136 that has flowed into the dry compartment 150a blows up and flows the lignite 132 that has been put into the dry compartment 150a. Thereby, the fluidized bed drying apparatus 102 forms the fluidized bed 155 in which the lignite 132 flows in the drying compartment 150a. A part of the lignite 132 fluidized in the drying compartment 150a moves upward in the vertical direction from the dividing plate 154, moves in the direction indicated by the arrow 156a, and moves to the drying compartment 150b.

  In the fluidized bed drying apparatus 102, the fluidized steam 136 is also introduced into the chamber compartment 152b. The fluidized steam 136 introduced into the chamber chamber 152b passes through the through hole 124a of the gas dispersion plate 124 and flows into the drying compartment 150b. The fluidized steam 136 that has flowed into the dry compartment 150b blows up and flows the lignite 132 that has been put into the dry compartment 150b. Thereby, the fluidized bed drying apparatus 102 forms the fluidized bed 155 in which the lignite 132 flows in the drying compartment 150b. Part of the lignite 132 fluidized in the drying compartment 150b moves upward in the vertical direction with respect to the dividing plate 154, moves in the direction indicated by the arrow 156b, and moves to the drying compartment 150c. The fluidized bed drying apparatus 102 constitutes a fluidized bed 155 together with the fluidized gas 136 to which the lignite 132 moved in the same manner in the drying compartments 150c, 150d, and 150e. Further, a part of the lignite 132 in the fluidized bed 155 of the drying compartment 150c moves upward in the vertical direction from the dividing plate 154, moves in the direction indicated by the arrow 156c, and moves to the drying compartment 150d. Part of the lignite 132 in the fluidized bed 155 of the drying compartment 150d moves upward in the vertical direction with respect to the dividing plate 154, moves in the direction indicated by the arrow 156d, and moves to the drying compartment 150e. The fluidized bed drying apparatus 102 discharges the lignite 138 that has reached the discharge unit 123 out of the lignite 132 that has become the fluidized bed 155 in the drying compartment 150e as the dry lignite 138 from the discharge unit 123.

  As described above, in the fluidized bed drying apparatus 102, the fluidized bed 155 is formed in a portion including the drying compartments 150 a, 150 b, 150 c, 150 d, and 150 e, which is a portion on the lower side in the vertical direction of the drying chamber 150. After the lignite 132 is input at the input unit 122, it moves in a fluidized bed 155, passes through the drying compartments 150 a, 150 b, 150 c, 150 d, and 150 e in this order and is discharged from the discharge unit 123. . Note that the lignite 132 is gradually dried when passing through the drying compartments 150a, 150b, 150c, 150d, and 150e, and becomes the dried lignite 138 when discharged from the discharge unit 123.

  In the fluidized bed drying apparatus 102, a free board portion F is formed in a portion vertically above the fluidized bed 155 in the drying chamber 150. The free board portion F is a region where the generated steam 134 is generated by drying the lignite 132 of the fluidized bed 155. The fluidized steam 136 is steam at a certain temperature or higher, and the brown coal 132 is dried by heating the brown coal 132 while flowing.

  Next, as described above, the heat transfer member 128 is disposed in a region where the fluidized bed 155 of the drying compartments 150a, 150b, 150c, 150d, and 150e is formed. The heat transfer member 128 is a heating unit that heats the lignite 132 of the fluidized bed 155 and removes moisture in the lignite 132, and is a pipe through which the superheated steam A can flow. The heat transfer member 128 dries the lignite 132 constituting the fluidized bed 155 using the latent heat of the high-temperature superheated steam A supplied and circulated inside. The heat transfer member 128 discharges the superheated steam A used for drying as condensed water B to the outside of the fluidized bed drying apparatus 102.

That is, the heat transfer member 128 condenses the superheated steam A in a region in contact with the fluidized bed 155 to form a liquid (moisture), and is effective for heating the lignite 132 by the condensed latent heat radiated at this time. Use. Note that the high-temperature superheated steam A circulated through the heat transfer member 128 may be any heat medium that involves a phase change, and examples thereof include Freon, pentane, and ammonia. Further, the heat transfer member 128 is not limited to a configuration using a pipe for circulating a heat medium. The heat transfer member 128 only needs to supply heat to the lignite 132 and can be dried. For example, an electric heater may be installed. The generated steam 134 generated when the lignite 132 is dried by the heat transfer member 128 flows to the free board portion F on the upper side in the vertical direction (downstream side in the flow direction of the generated steam 134). Superheated steam supplying device 129 via a heating line L _4, and supplies the superheated steam A heat transfer member 128.

In the fluidized bed drying apparatus 102, the heat transfer member 128 provided inside the fluidized bed 155 heats the lignite 132 of the fluidized bed 155 to dry the lignite 132. The generated steam 134 generated by drying the lignite 132 flows from the fluidized bed 155 into the free board portion F. Then, the generated steam 134 that has flowed into the free board section F is discharged from the steam discharge section 127 to the outside of the fluidized bed drying apparatus 102. Generating steam 134 discharged from the steam discharge section 127 is supplied to generate steam line L _1.

  The fluidized bed drying apparatus 102 divides the drying chamber 150 into a plurality of drying compartments 150a, 150b, 150c, 150d, and 150e, and moves to the plurality of drying compartments 150a, 150b, 150c, By setting it as the structure which passes 150d and 150e in order, lignite can be dried more uniformly. That is, it can suppress that the lignite 132 which reaches | attains the discharge part 123 in a short time by the flow of the fluidized bed 155, or the lignite 132 which does not reach the discharge part 123 even if it passes for a long time can be suppressed.

  Further, as in the present embodiment, a part of the lignite 132 on the upper side of the fluidized bed 155 moves to the next drying compartment, so that the moisture content is relatively small and moves upward in one drying compartment. The lignite 132 that is being moved can be moved to the next drying compartment. That is, since the hydrated charcoal 132 that contains a relatively large amount of moisture and is not dried in the dry compartment is heavy, it can be moved to the lower side of the dry compartment and dried in the dry compartment. As a result, the lignite 132 is dried to a certain degree in each of the drying compartments 150a, 150b, 150c, 150d, and 150e, and then moves to the next drying compartment. It can be made into the dry state to the extent.

  Moreover, since the fluidized bed drying apparatus 102 of this embodiment can dry the lignite 132 suitably, it was made into the shape which divided | segmented the drying chamber 150 into the several drying compartment by the division plate 154, but it is not limited to this. The fluidized bed drying apparatus 120 can suppress the stay and settling of the lignite 132 regardless of the shape of the drying chamber 150, and can suppress the blockage of the lignite 132 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 100 will be continued using FIG. 2 and FIG. 3. Cooling trap 103, a fluidized bed dryer generating steam 134 from the steam discharge portion 127 is discharged to generate steam line L ₁ of 102 and cooled, to separate the dust (solid component), such as dust contained in the generated steam 134 . The cooling trap 103 includes a cooling mechanism 180 that cools the generated steam 134 and a collection unit 182 that collects water droplets containing dust aggregated as the generated steam 134 is cooled. Note that the cooling trap 103 may include a collection unit that is cooled to a predetermined temperature or less in which the cooling mechanism 180 and the collection unit 182 are integrated. Cooling mechanism 180 of the cold trap 102 may 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 134 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 180 does not include an active cooling mechanism, mechanism for cooling the steam generated 134 generated vapor line L ₁ by causing a predetermined distance passed and You can also Collecting portion 182 of the cold trap 103 is comprised of 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 103 cools the generated steam 134 into 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 103 removes or reduces the dust contained in the generated steam 134 by collecting the water droplets containing the dust in the collection unit. Note that the generated steam 134 passes through the cooling trap 103 to become a generated steam 135a whose temperature is reduced and dust is removed or reduced.

Superheating means 104 flows through the steam generated line _{L 1,} a means for superheating the steam generated 135a that has passed through the cold trap 103. As shown in FIG. 3, the superheater 104 introduces the generated steam line L ₁ into the fluidized bed drying apparatus 102, specifically, the free board part F of the drying container 120, and generates the generated steam line L _1. The steam 135 a is superheated with the generated steam 134 inside the fluidized bed drying apparatus 102. Superheating means 104, by superheating the steam generated 135a through the generation steam line _{L 1,} the generated steam 135b became hotter than the steam generated 135a. Note that the superheating means 104 is preferably a pipe formed of a material that easily absorbs heat from the outside as a pipe through which the generated steam 135a flows. Moreover, it is preferable that the superheating means 104 has a shape in which the piping is bent at the free board portion F so that the generated steam 135a moves through the free board portion F for a longer distance. Moreover, it can heat also by heat exchange with the condensed water of the heat-transfer member 128 exit.

Branch 105 flows through the steam generated line _{L 1,} a mechanism for splitting the generated steam 135b that has passed through the heating means 104 into two lines. One line branched by the branching unit 105, connected to the heat recovery system 106 and the other line is connected to the circulating device 114 as the branch line L _2.

The cooler 110 cools the dried powder obtained by mixing the solid component 144 with the dried lignite 138 extracted from the fluidized bed drying apparatus 102. Cooler 110 is discharged from the product line _{L 3} The cooled powder as product coal 140. This product charcoal 140 is supplied to the gasifier 13 as described above.

  The heat recovery system 111 is a system that recovers the heat of the generated steam 135b by heat exchange or the like. The generated steam 135b flowing through one of the pipes branched by the branching section 105 is, for example, steam at 105 to 110 ° C. The heat recovery system 111 performs heat recovery on the generated steam 135b. The water treatment unit 112 is a treatment device that treats the generated steam 135b heat-recovered by the heat-recovery system 111. The water treatment unit 112 treats the generated steam 135b heat recovered by the heat recovery system 111 and discharges the generated steam 135b to the outside of the fluidized bed drying facility 100 as drainage 142.

Further, the circulating apparatus 114 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 114 is branched by the branching unit 105 sends the generated steam 135b through the branch line _{L 2} to the fluidized bed dryer 102. The generated steam 135b sent into the fluidized bed drying apparatus 102 is used as fluidized steam 136 that causes the fluidized bed of lignite 132 to flow. In addition, although the fluidized bed drying equipment 100 of the present embodiment reuses a part of the generated steam 135b 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 the combined coal gasification combined power generation system 10, even when the lignite 132 having high moisture is gasified, the lignite 132 is dried by the efficient fluidized bed drying apparatus 102, so that the gasification efficiency is high. The power generation can be improved stably over a long period of time.

  The fluidized bed drying facility 100 of this embodiment can remove or reduce the dust in the generated steam 134 efficiently with a simple configuration by collecting the dust by cooling the generated steam 134 with the cooling trap 103. . By efficiently removing and reducing the dust in the generated steam 134, it is possible to reduce the influence of the dust on each part arranged on the downstream side of the gas flow with respect to the cooling trap 103. Thereby, the apparatus lifetime of each part arrange | positioned downstream of the gas flow rather than the cooling trap 103 can be extended, and the frequency | count and frequency of a maintenance can be reduced.

  Further, the fluidized bed drying facility 100 of the present embodiment uses the generated steam 135a that has passed through the cooling trap 103 by the superheating means 104 as a heat source in the system of the fluidized bed drying facility 100, specifically, the free board portion F of the drying container 120. Heat is generated from the generated steam 135b discharged from the fluidized bed drying apparatus 102 by being overheated (heat exchange) by the heat of the generated steam 134 to generate the generated steam 135b. As described above, the fluidized bed drying facility 100 of the present embodiment can efficiently remove dust from the generated steam by cooling the generated steam 134 with the cooling trap 103 and then reheating it with the superheating means 104. The latent heat of steam can be recovered. Further, by using the heat of the generated steam 134 of the free board portion F of the drying container 120 as a heat source for heating the generated steam, the generated steam 135a can be heated without providing a new heat source. As described above, the heat source may be condensed water returning from the heat transfer member 128.

  In addition, although the fluidized bed drying equipment 100 of the present embodiment uses a part of the generated steam 135b after being branched by the branching part 105 in the heat recovery system 111 and uses the remaining part as fluidized steam, It is not limited to. The fluidized bed drying facility 100 may effectively utilize the heat of the generated steam 135b after being superheated by the superheating means 104.

Another embodiment of the fluidized bed drying facility will be described with reference to FIG. Here, FIG. 4 is a schematic view showing another embodiment of the fluidized bed drying facility. A fluidized bed drying facility 200 shown in FIG. 4 includes a supply hopper 101, a fluidized bed drying apparatus 102, a cooling trap 103, a superheating means 210, a branching unit 105, a cooler 110, a heat recovery system 111, water A processing unit 112 and a circulation device 114 are provided. Moreover, fluidized bed drying equipment 200 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 210 is the same as the fluidized bed drying equipment 100, the fluidized bed drying equipment 200 is abbreviate | omitted description.

Superheating means 210 flows through the steam generated line _{L 1,} a means for superheating the steam generated 135a that has passed through the cold trap 103. As shown in FIG. 4, the superheater 210 includes a portion where the generated steam 135 a that has passed through the cooling trap 103 of the generated steam line L ₁ and a region where the condensed water B of the heat transfer member 128 flows, that is, the heat transfer member 128. Among them, the outside of the drying container 120 through which the condensed water B after passing through the inside of the drying container 120 flows is adjacent to or brought into contact, and the generated steam 135a is superheated with the condensed water B. The superheating means 210 is a mechanism for performing heat exchange between the generated steam 135a and the condensed water B. Superheating means 210, by superheating the steam generated 135a through the steam generated line _{L 1} in the condensed water B, and generates steam 135b became hotter than the steam generated 135a. Note that the superheating means 210 is preferably a pipe formed of a material that easily absorbs heat from the outside as a pipe through which the generated steam 135a flows.

  The fluidized bed drying facility 200 can obtain the same effect as the fluidized bed drying facility by using the superheating means 210 to superheat the generated steam 135a with the heat of the condensed water B flowing through the heat transfer member 128. 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 135a. Moreover, since the condensed water B is a used substance, the utilization efficiency of the heat generated in the fluidized bed drying facility 200 can be improved by using the heat of the condensed water B.

DESCRIPTION OF SYMBOLS 10 Coal gasification combined cycle power generation system 100 Fluidized bed drying equipment 101 Supply hopper 102 Fluidized bed drying apparatus 103 Cooling trap 104,210 Superheating means 105 Branch part 110 Cooler 111 Heat recovery system 120 Drying container 122 Input part 123 Outlet part 124 Gas dispersion Plate 126 Fluidized gas supply unit 127 Steam discharge unit 128 Heat transfer member 129 Superheated steam supply device 132 Brown coal 134, 135a, 135b Generated steam 136 Fluidized steam 138 Dry brown coal 140 Product coal 142 Drainage 150 Drying chamber 150a, 150b, 150c, 150d, 150e Drying compartment 152 Chamber chamber 152a, 152b, 152c, 152d, 152e Chamber compartment 154 Dividing plate 155 Fluidized bed 156a, 156b, 156c, 156d Arrow A Superheated steam B Condensed water F Free board section L ₁ generation steam line L ₂ line L ₃ product line L ₄ heating line

Claims (5)

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 cooler for cooling a dried product obtained by drying the wet raw material discharged from the discharge unit;
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 A fluidized bed drying facility comprising: superheating means for superheating with generated steam . 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; A fluidizing gas supply unit that supplies a fluidized gas that forms a fluidized bed together with a wet raw material in the drying chamber to the chamber chamber, and the wet raw material of the fluidized bed formed by supplying the fluidized gas is dried. A steam discharge unit that discharges generated steam generated from the top of the drying container, a pipe disposed inside the fluidized bed of the drying container, and a superheating medium supply device that supplies a superheating medium to the pipe With a heat means, a fluidized bed dryer for drying the moisture content is high the moist material in the drying vessel,
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 cooler for cooling a dried product obtained by drying the wet raw material discharged from the discharge unit;
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. Means for fluidized bed drying.   The said fluidized bed drying apparatus is further provided with a 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. Tap a portion of the generated steam is heated by the heating means, any of claims 1 to 3, characterized in the branch line for supplying a fluidizing gas supply unit, further comprising as said fluidizing gas fluidized bed drying equipment according to an item or. The tap a portion of the heated the generated steam superheating means, according to any one of claims 1 to 4, characterized in that it comprises further, a heat recovery system for recovering heat from the steam generated Fluidized bed drying equipment.

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