JP2018096656A - Fluidized bed system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent property change of fluidized medium, and move the fluidized medium at low cost.SOLUTION: A fluidized bed system 100 includes: a first fluidized bed chamber 212 having a first input port 212b provided on a first side wall 212a, and a first discharge port 212d provided on a second side wall 212c; a partition plate 214 configured to partition the inside of the first fluidized bed chamber into an upstream chamber 214a and a downstream chamber 214b; a first fluidized gas supply unit 216 configured to supply fluidized gas to the upstream chamber at a first flow rate, and supply fluidized gas to the downstream chamber at a second rate at which a maximum bed height of the fluidized bed in the downstream chamber is beyond a position of the first discharge port; and a communication pipe 220 connected to the first discharge port and a second input port 232a of a second fluidized bed chamber 232. The partition plate 214 is provided so that a distance between the partition plate 214 and the second side wall 212c becomes a distance at which slagging occurs in the downstream chamber.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a fluidized bed system that moves a fluidized medium from a first fluidized bed chamber in which a fluidized bed of a fluidized medium is formed to a second fluidized bed chamber.

  A fluidized bed system using a fluidized bed formed by jetting gas from the bottom to the top of a fluidized bed chamber in which particulate solids are accommodated is used to dry, burn, gasify, and granulate solids. It is used in various fields. In such a fluidized bed system, a plurality of fluidized bed chambers are provided for changing the conditions of the fluidized bed (temperature, atmosphere, etc.), limiting the installation area (installation volume), and ensuring controllability. There are also things.

  In a fluidized bed system having a plurality of fluidized bed chambers, as a technique for moving solids (fluid medium) from the first fluidized bed chamber to the second fluidized bed chamber, a conveyor after taking out the fluidized medium from the first fluidized bed chamber The technique (for example, patent document 1) to which it moves to a 2nd fluidized bed chamber is developed.

JP 2002-095952 A

  However, in the technique using a conveyor as described in Patent Document 1, the fluid medium is exposed to air during the movement process. For this reason, when a fluid medium reacts with substances in the air, such as oxygen and water, or when substances in the air are adsorbed, there is a problem that the properties of the fluid medium change during the movement process.

  In view of such a problem, the present disclosure aims to provide a fluidized bed system capable of moving a fluidized medium while preventing a change in properties of the fluidized medium.

In order to solve the above-described problem, a fluidized bed system according to an aspect of the present disclosure includes a first inlet provided in a first side wall, and a first outlet provided in a second side wall facing the first side wall. The distance between the first fluidized bed chamber and the second side wall between the first and second sidewalls in the first fluidized bed chamber is equal to or less than the distance B represented by the following formula (A). So as to be separated from the ceiling and bottom surface of the first fluidized bed chamber, partitioning the first fluidized bed chamber into an upstream chamber and a downstream chamber, and a fluidizing gas in the upstream chamber Is supplied at a predetermined first flow rate, and a fluidized gas supply is provided to supply the fluidized gas to the downstream chamber at a second flow rate in which the maximum bed height of the fluidized bed in the downstream chamber exceeds the position of the first discharge port. Part, a communication pipe having one end connected to the first discharge port, and a second input in which the other end of the communication pipe is connected And a second fluidized bed chamber having a.

  The second flow rate may be greater than the first flow rate.

  Moreover, you may provide the communicating pipe gas supply part which supplies fluidization gas to the said communicating pipe.

  It is possible to move the fluid medium while preventing changes in the properties of the fluid medium.

It is a figure explaining a fluid bed system. It is a figure explaining the distance of a partition plate and a 2nd side wall. It is a figure explaining a modification.

  Hereinafter, an embodiment of the present disclosure will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiment are merely examples for facilitating understanding, and do not limit the present disclosure unless otherwise specified. In the present specification and drawings, elements having substantially the same functions and configurations are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present disclosure are not illustrated. To do.

(Fluidized bed system 100)
FIG. 1 is a diagram illustrating a fluidized bed system 100. In the present embodiment, a configuration in which the fluidized bed system 100 dries lignite as a fluidized medium will be described as an example. In FIG. 1, the gas flow is indicated by solid arrows, the flow of the fluid medium is indicated by dashed-dotted arrows, and the signal flow is indicated by broken arrows. As shown in FIG. 1, the fluidized bed system 100 includes an introduction unit 110, a moisture sensor 120, a first fluidized bed unit 210, a communication pipe 220, a second fluidized bed unit 230, and a central control unit 240. Consists of including.

(Introduction unit 110, moisture sensor 120)
The introduction unit 110 includes a conveyor 112, a hopper 114, an introduction pipe 116, and an introduction valve 118. The conveyor 112 conveys lignite to the hopper 114 from a lignite supply source. The hopper 114 temporarily stores the lignite transported by the conveyor 112. The introduction pipe 116 is a pipe that communicates the hopper 114 and the first fluidized bed unit 210 (the first inlet 212b of the first fluidized bed chamber 212). The introduction valve 118 is provided in the introduction pipe 116 and adjusts the opening degree of the introduction pipe 116.

  The moisture sensor 120 measures the moisture content of the brown coal introduced into the first fluidized bed portion 210 by the introduction portion 110. As the moisture sensor 120, for example, a moisture sensor such as a near infrared absorption method or a microwave absorption method can be adopted.

(First fluidized bed 210)
The first fluidized bed unit 210 includes a first fluidized bed chamber 212, a partition plate 214, a first fluidized gas supply unit 216 (fluidized gas supply unit), and a first heat transfer unit 218. The

  The first fluidized bed chamber 212 is a container for storing lignite. A first inlet 212b is provided in the first side wall 212a constituting the first fluidized bed chamber 212. Of the side walls constituting the first fluidized bed chamber 212, a first discharge port 212d is provided in a second side wall 212c facing the first side wall 212a. An inlet pipe 116 is connected to the first inlet 212b, and lignite is introduced into the first fluidized bed chamber 212 through the first inlet 212b. And the 1st fluidized bed chamber 212 accommodates the introduced lignite. Further, a gas discharge pipe 212e for discharging the gas in the first fluidized bed chamber 212 to the outside is connected to the ceiling of the first fluidized bed chamber 212.

  The partition plate 214 is provided between the first side wall 212 a and the second side wall 212 c in the first fluidized bed chamber 212, separated from the ceiling and the bottom surface of the first fluidized bed chamber 212. The partition plate 214 is provided substantially in parallel with the first side wall 212a and the second side wall 212c. The partition plate 214 is connected to both side walls of the first fluidized bed chamber 212 other than the first sidewall 212a and the second sidewall 212c, and the first fluidized bed chamber 212 is connected to the upstream chamber 214a and the downstream chamber. And 214b. The upstream chamber 214a is formed between the first side wall 212a and the partition plate 214, and the downstream chamber 214b is formed between the partition plate 214 and the second side wall 212c. In the present embodiment, the partition plate 214 is provided in the first fluidized bed chamber 212 so that the downstream chamber 214b has a smaller horizontal cross-sectional area (volume) than the upstream chamber 214a.

  The first fluidizing gas supply unit 216 supplies the first fluidizing gas (for example, water vapor) from the bottom surface of the upstream chamber 214a, and supplies the first fluidizing gas (for example, water vapor) from the bottom surface of the downstream chamber 214b.

  More specifically, the first fluidizing gas supply unit 216 includes wind boxes 216a and 216b, first flow pipes 216c and 216d, and blowers 216e and 216f. The air box 216a is provided below the upstream chamber 214a, and the upper portion of the air box 216a also functions as a bottom surface of the upstream chamber 214a and is formed of a dispersion plate 216g that can be ventilated. The air box 216b is provided below the downstream chamber 214b, and the upper portion of the air box 216b also functions as a bottom surface of the downstream chamber 214b and is formed of a dispersion plate 216h that can be ventilated. The dispersion plates 216g and 216h are constituted by, for example, a plate provided with a plurality of openings having a diameter smaller than the particle size of lignite, or a plate provided with nozzles. In the present embodiment, the wind box 216a and the wind box 216b are adjacent to each other, and the boundary between the wind box 216a and the wind box 216b is located vertically below the lower end of the partition plate 214 (for example, directly below). In addition, wind boxes 216a and 216b are arranged.

  The first flow pipe 216c is connected to the wind box 216a. Further, the first flow pipe 216c is provided with a blower 216e for feeding the first fluidizing gas. The first flow pipe 216d is connected to the wind box 216b. The first flow pipe 216d is provided with a blower 216f for feeding the first fluidizing gas.

  The blower 216e supplies the first fluidizing gas to the upstream chamber 214a at a first flow rate that is a flow rate at which a fluidized bed of lignite is suitably formed in the upstream chamber 214a. The blower 216f is a flow rate at which a predetermined superficial velocity is higher than the superficial velocity of the upstream chamber 214a, and the maximum height of the fluidized bed of lignite in the downstream chamber 214b is a flow rate that exceeds the first outlet 212d. The first fluidizing gas is supplied to the downstream chamber 214b at two flow rates. Of the pulsating fluidized bed height (layer height), the minimum bed height is referred to as the minimum bed height, and the maximum bed height is referred to as the maximum bed height. The average layer height is a temporal average value of the pulsating layer height.

  Thus, the first fluidizing gas is supplied into the upstream chamber 214a by the blower 216e. The first fluidizing gas causes the lignite to flow in the upstream chamber 214a to form a fluidized bed of lignite. In addition, the blower 216e evaporates a part of the water contained in the lignite by bringing the first fluidizing gas into contact with the lignite.

  As described above, the partition plate 214 extends into the first fluidized bed chamber 212 in a state where the upper and lower portions in the first fluidized bed chamber 212 are communicated. That is, the upstream chamber 214a and the downstream chamber 214b communicate with each other at the lower part. Therefore, the fluidized bed (brown coal) formed in the upstream chamber 214 a moves to the downstream chamber 214 b through the lower part of the partition plate 214.

  The blower 216f that supplies the fluidizing gas to the downstream chamber 214b supplies the fluidizing gas to the downstream chamber 214b at the second flow rate. Then, the lignite moved from the upstream chamber 214a forms a fluidized bed.

距離Ｒが距離Ｂを上回ると、下流室２１４ｂにおいてスラッギング（突沸）を起こすことができない。また、距離Ｒが褐炭の最大粒径の７倍以下であると、褐炭がブリッジング（bridging）して、下流室２１４ｂが褐炭で閉塞されてしまう。そこで、距離Ｒを上記範囲内とすることで、下流室２１４ｂにおいて、第１流動化ガスの気泡を大きくすることができ、褐炭の流動層をスラッギング（突沸）させることが可能となる。そうすると、下流室２１４ｂ内の褐炭は、第１排出口２１２ｄに到達し、第１排出口２１２ｄを通じて連通管２２０に導入される。 FIG. 2 is a diagram illustrating the distance between the partition plate 214 and the second side wall 212c. For ease of understanding, the first inlet 212b, the first outlet 212d, and the gas outlet 212e are omitted in FIG. As shown in FIG. 2, in this embodiment, the distance R between the partition plate 214 and the second side wall 212 c is a distance B or less represented by the following formula (A) to a value exceeding 7 times the maximum particle size of lignite. A partition plate 214 is provided in the first fluidized bed chamber 212 so as to be within the range.

If the distance R exceeds the distance B, slagging (bumping) cannot occur in the downstream chamber 214b. Moreover, when the distance R is 7 times or less of the maximum particle size of lignite, the lignite bridging, and the downstream chamber 214b is blocked with lignite. Therefore, by setting the distance R within the above range, the bubbles of the first fluidizing gas can be increased in the downstream chamber 214b, and the fluidized bed of lignite can be slugged (bumped). Then, the lignite in the downstream chamber 214b reaches the first discharge port 212d and is introduced into the communication pipe 220 through the first discharge port 212d.

  Further, as described above, the blower 216f supplies the first fluidizing gas to the downstream chamber 214b at the second flow rate. Thereby, more slugging can be caused in the downstream chamber 214b.

  Referring back to FIG. 1, the first heat transfer unit 218 is constituted by, for example, a pipe through which a heat medium flows, and is arranged in the upstream chamber 214a. The 1st heat-transfer part 218 heats lignite with the heat | fever which a heat medium has in the distribution | circulation process of a heat medium. With the configuration including the first heat transfer section 218, heat exchange is performed between the heat medium and the first fluidizing gas in the upstream chamber 214a, and the first fluidizing gas moving upward is further heated. Can do. Therefore, drying of lignite with the first fluidizing gas is further promoted.

  Thus, in the 1st fluidized bed part 210, undried lignite is introduce | transduced in the 1st fluidized bed chamber 212, lignite is heated by the 1st fluidization gas supply part 216 and the 1st heat transfer part 218, and lignite A part of the water is evaporated and removed. On the other hand, when the flow of lignite is described, lignite is transferred from the first fluidized bed chamber 212 to the second fluidized bed chamber 232 through the first discharge port 212d and the communication pipe 220 in accordance with control by the central control unit 240 described later. Will move.

(Communication pipe 220)
The communication pipe 220 has one end connected to the first discharge port 212d and the other end connected to a second input port 232a of the second fluidized bed chamber 232 described later.

(Second fluidized bed 230)
The second fluidized bed unit 230 includes a second fluidized bed chamber 232, a second fluidized gas supply unit 234, and a second heat transfer unit 236.

  The second fluidized bed chamber 232 is a container in which a second input port 232 a and a second discharge port 232 b are provided on the side wall that constitutes the second fluidized bed chamber 232. A communication pipe 220 is connected to the second inlet 232a, and lignite is supplied from the first fluidized bed chamber 212 to the second fluidized bed chamber 232 through the first outlet 212d, the communication pipe 220, and the second inlet 232a. be introduced. And the 2nd fluidized bed chamber 232 accommodates the introduced lignite. In addition, a gas discharge pipe 232 e that discharges the gas in the second fluidized bed chamber 232 to the outside is connected to the ceiling of the second fluidized bed chamber 232.

  In the present embodiment, the second inlet 232a is located below the first outlet 212d. Accordingly, the communication pipe 220 is disposed so as to be inclined downward (for example, an inclination angle of 3 degrees to 10 degrees) from one end (the first discharge port 212d side) to the other end (the second input port 232a side). . Thereby, the movement of lignite can be promoted in the communication pipe 220.

  The second fluidizing gas supply unit 234 supplies the second fluidizing gas (for example, water vapor) from the bottom surface of the second fluidized bed chamber 232. More specifically, the second fluidizing gas supply unit 234 includes an air box 234a, a second fluid pipe 234b, and a second blower 234c, similarly to the first fluidizing gas supply unit 216. The The air box 234a is provided below the second fluidized bed chamber 232, and the upper portion of the air box 234a also functions as a bottom surface of the second fluidized bed chamber 232 and is formed of a dispersion plate 234d that can vent. The dispersion plate 234d is constituted by, for example, a plate provided with a plurality of openings having a diameter smaller than the particle size of lignite, or a plate provided with a nozzle.

  The second flow pipe 234b is connected to the wind box 234a. The second flow pipe 234b is provided with a second blower 234c for feeding the second fluidizing gas. Therefore, when the fluidized bed system 100 is operated, the second fluidized gas is supplied into the second fluidized bed chamber 232 from the bottom surface of the second fluidized bed chamber 232 through the wind box 234a.

  Thus, the second fluidized gas is supplied into the second fluidized bed chamber 232 by the second fluidized gas supply unit 234. The second fluidizing gas causes the lignite to flow in the second fluidized bed chamber 232 to form a fluidized bed of lignite. Moreover, the 2nd fluidization gas supply part 234 evaporates some water contained in lignite by making 2nd fluidization gas contact with lignite.

  The second heat transfer unit 236 is constituted by, for example, a pipe through which a heat medium flows, and is arranged in the second fluidized bed chamber 232. The second heat transfer unit 236 heats the lignite with the heat of the heat medium in the flow process of the heat medium. With the configuration including the second heat transfer section 236, heat exchange is performed between the heat medium and the second fluidizing gas in the second fluidized bed chamber 232, and the second fluidizing gas that moves upward is further added. Can be heated. Therefore, drying of the lignite with the second fluidizing gas is further promoted.

  The overflow part 238 includes an overflow pipe 238a connected to the second discharge port 232b and an overflow valve 238b provided in the overflow pipe 238a. The overflow part 238 sends out the lignite overflowed from the second outlet 232b of the second fluidized bed chamber 232 to the outside. More specifically, when lignite is introduced into the second fluidized bed chamber 232 from the first fluidized bed section 210 (in the first fluidized bed chamber 212) through the communication pipe 220, the volume of the introduced lignite, The volume of the fluidized bed increases. If it does so, lignite (fluidized bed) will overflow from the 2nd discharge port 232b, and will be sent outside through overflow pipe 238a.

(Central control unit 240)
The central control unit 240 is composed of a semiconductor integrated circuit including a CPU (central processing unit), reads programs and parameters for operating the CPU itself from the ROM, and cooperates with a RAM as a work area and other electronic circuits. Thus, the entire fluidized bed system 100 is managed and controlled. In the present embodiment, the central control unit 240 functions as an introduction control unit 242 that controls the conveyor 112 and the introduction valve 118.

  Specifically, the introduction control unit 242 performs the first flow so that the lignite sent from the overflow unit 238 of the second fluidized bed chamber 232 is dried to the target value based on the measurement value of the moisture sensor 120. The residence time of lignite in the bed chamber 212 and the second fluidized bed chamber 232 is derived. For example, when the measured value of the moisture sensor 120 is relatively large, that is, when the moisture content of undried lignite is high, the residence time becomes long, and when the measured value of the moisture sensor 120 is relatively small, that is, When the moisture content of undried lignite is low, the residence time is shortened.

  The introduction controller 242 then determines the derived residence time, the average bed height of the fluidized bed formed in the upstream chamber 214a (first fluidized bed chamber 212), and the flow formed in the second fluidized bed chamber 232. Based on the average layer height of the layers, the conveyance speed of the conveyor 112 and the opening degree of the introduction valve 118 and the overflow valve 228b are controlled.

  As described above, according to the fluidized bed system 100 according to the present embodiment, the partition plate 214 is provided in the first fluidized bed chamber 212, and the distance R between the partition plate 214 and the second side wall 212c is within the above range. By doing so, the fluidized bed of lignite can be slugged in the downstream chamber 214b. Further, the blower 216f of the first fluidizing gas supply unit 216 supplies the first fluidizing gas to the downstream chamber 214b at the second flow rate, so that the lignite is passed from the downstream chamber 214b to the second fluidized bed unit 230 by slagging. It becomes possible to make it flow. Thereby, lignite can be moved from the first fluidized bed chamber 212 to the second fluidized bed chamber 232. For this reason, unlike the prior art which moves between fluidized bed chambers using a conveyor, it is possible to avoid a situation where lignite is exposed to air during the moving process. Therefore, it can prevent that brown coal reacts with the substance in the air, or adsorbs the substance in the air. That is, it becomes possible to avoid changes in the properties of lignite during the movement process between fluidized bed chambers.

  Moreover, there is a concern that the dried lignite in a high temperature state reacts with oxygen in the air and burns. For this reason, in the prior art which moves between fluidized bed chambers using a conveyor, it is necessary to make the apparatus provided with the drive part called a conveyor into a sealed structure, or to equip with fire extinguishing equipment, and it will increase cost. There was a problem. However, in the fluidized bed system 100 of the present embodiment, since it is a simple mechanism in which lignite moves within the communication pipe 220 partitioned from the outside, the sealing structure of the apparatus provided with the drive unit and the fire extinguishing equipment become unnecessary. . Therefore, the cost can be reduced.

  As mentioned above, although embodiment was described referring an accompanying drawing, it cannot be overemphasized that this indication is not limited to this embodiment. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims and that they naturally fall within the technical scope.

  For example, in the above embodiment, lignite has been described as an example of the fluid medium. However, there is no limitation on the type of fluid medium as long as it is a particulate solid.

  Moreover, in the said embodiment, the 1st fluidization gas supply part 216 demonstrated and demonstrated as an example the structure which supplies the 1st fluidization gas of the flow volume larger than the upstream chamber 214a to the downstream chamber 214b. However, the first fluidized gas supply unit 216 can form a fluidized bed in the upstream chamber 214a, and the first fluidized gas supply unit 216 has a flow rate at which the maximum bed height of the fluidized bed in the downstream chamber 214b exceeds the position of the first outlet 212d. A fluidizing gas may be supplied. For example, the first fluidizing gas supply unit 216 may supply the first fluidizing gas to the upstream chamber 214a and the downstream chamber 214b at a substantially equal flow rate.

  In this case, the shape of the dispersion plate 216g may be changed. FIG. 3 is a diagram illustrating a modification. As shown in FIG. 3A, the first fluidized bed unit 310 according to the first modification includes a first fluidized bed chamber 212, a partition plate 214, a first fluidized gas supply unit 316, And a heat transfer section 218. In addition, about the component substantially equal to the said 1st fluidized bed part 210, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The first fluidized gas supply unit 316 of the first fluidized bed unit 310 includes an air box 216a, a first fluid pipe 216c, and a blower 216e. That is, the first fluidizing gas supply unit 316 does not include the wind box 216b, the first fluid pipe 216d, and the blower 216f as compared with the first fluidizing gas supply unit 216. In the first modification, the wind box 216a is provided below the first fluidized bed chamber 212 (upstream chamber 214a and downstream chamber 214b). The upper portion of the wind box 216a also functions as a bottom surface of the first fluidized bed chamber 212, that is, the bottom surface of the upstream chamber 214a and the bottom surface of the downstream chamber 214b, and is formed of a dispersible plate 216g. However, the dispersion plate 216g includes an inclined portion 316g that is inclined vertically upward from a position of the dispersion plate 216g that is located vertically below the partition plate 214 to a place that is connected to the second side wall 212c. By providing the inclined portion 316g, the superficial velocity of the downstream chamber 214b can be made larger than that of the upstream chamber 214a. Therefore, more slugging can be caused in the downstream chamber 214b.

  Further, as shown in FIG. 3B, the first fluidized bed unit 410 according to the second modification includes a first fluidized bed chamber 212, a partition plate 214, a first fluidized gas supply unit 316, A promotion gas supply unit 326 and a first heat transfer unit 218 are included. In addition, about the component substantially equivalent to the said 1st fluidized bed part 310, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  In the second modification, the dispersion plate 216g extends in the horizontal direction from the first side wall 212a to the second side wall 212c (is flush). The promotion gas supply unit 326 supplies the first fluidizing gas to the downstream chamber 214b. The promotion gas supply unit 326 includes a supply pipe 326a and a blower 326b. The supply pipe 326 a is connected between the first discharge port 212 d in the second side wall 212 c and the lower end of the partition plate 214. The supply pipe 326a is provided with a blower 326b for feeding the first fluidizing gas. By providing the promoting gas supply unit 326, the flow rate of the first fluidizing gas passing through the downstream chamber 214b can be increased. Therefore, more slugging can be caused in the downstream chamber 214b.

  Further, in the above-described embodiment, the configuration in which the communication pipe 220 is inclined downward in the vertical direction from one end to the other end has been described as an example. However, the second fluidized bed part 230 may extend in the horizontal direction. That is, the first discharge port 212d and the second input port 232a may be provided at substantially the same height.

  Moreover, you may supply fluidization gas in the communicating pipe 522 like the 3rd modification shown in FIG.3 (c). The communication unit 520 according to the third modification includes a communication pipe 522 and a communication pipe gas supply unit 524. The communication pipe 522 is a pipe having one end connected to the first outlet 212d and the other end connected to the second inlet 232a. The communication pipe gas supply unit 524 supplies fluidized gas (for example, water vapor) from the bottom surface of the communication pipe 522. The communication pipe gas supply unit 524 includes an air box 524a, a flow pipe 524b, and a blower 524c. The air box 524a is provided below the communication pipe 522. The upper portion of the wind box 524a also functions as a bottom surface of the communication pipe 522 and is formed of a dispersion plate 524d that can be ventilated. The dispersion plate 524d is formed of, for example, a plate provided with a plurality of openings having a diameter smaller than the particle size of lignite, or a plate provided with a nozzle. The flow pipe 524b is connected to the wind box 524a. The flow pipe 524b is provided with a blower 524c for feeding a fluidizing gas. In the communication unit 520 according to the third modification, a fluidized bed of lignite can be formed in the communication pipe 522. Therefore, the movement of lignite in the communication pipe 522 can be promoted. The blower 524c may supply the fluidizing gas at a flow rate at which the superficial velocity of the communication pipe 522 is 1.0 Umf to 1.2 Umf. Thereby, it becomes possible to move lignite smoothly.

  Further, the first fluidized bed part 210 and the second fluidized bed part 230 may have the same configuration (modularization). Thereby, the manufacturing cost of the 1st fluidized bed part 210 and the 2nd fluidized bed part 230 can be reduced. In addition, the first fluidized bed chamber 212 and the second fluidized bed chamber 232 may be provided with a discharge port for discharging the internal gas. Further, the first fluidized bed chamber 212 may be an airtight container in which holes for passing gas and lignite are not formed other than the holes of the first inlet 212b, the first outlet 212d, and the dispersion plates 216g and 216h. Thereby, the gas in the first fluidized bed chamber 212 is discharged only from the communication pipe 220. Therefore, the movement of lignite from the downstream chamber 214b to the communication pipe 220 can be promoted by the gas flow.

  Moreover, the 1st heat-transfer part 218 and the 2nd heat-transfer part 236 are not essential structures.

  The present disclosure can be used in a fluidized bed system that moves a fluidized medium from a first fluidized bed chamber in which a fluidized bed of a fluidized medium is formed to a second fluidized bed chamber.

100 fluidized bed system 212 first fluidized bed chamber 212a first side wall 212b first inlet 212c second side wall 212d first outlet 214 partition plate 214a upstream chamber 214b downstream chamber 216 first fluidized gas supply section (fluidized gas supply) Part)
220 Communication pipe 232 Second fluidized bed chamber 232a Second inlet 316 First fluidized gas supply part (fluidized gas supply part)
524 Communication pipe gas supply unit

Claims (3)

A first fluidized bed chamber having a first inlet provided in the first side wall and a first outlet provided in the second side wall facing the first side wall;
The first flow so that the distance between the first side wall and the second side wall in the first fluidized bed chamber is less than or equal to the distance B represented by the following formula (A). A partition plate provided separately from the ceiling and bottom surface of the layer chamber, and dividing the first fluidized bed chamber into an upstream chamber and a downstream chamber;
Fluidizing gas is supplied to the upstream chamber at a predetermined first flow rate, and fluidizing gas is supplied to the downstream chamber at a second flow rate in which the maximum bed height of the fluidized bed in the downstream chamber exceeds the position of the first outlet. Fluidized gas supply section for supplying
A communication pipe having one end connected to the first discharge port;
A second fluidized bed chamber having a second inlet connected to the other end of the communication pipe;
Fluidized bed system.

  The fluidized bed system according to claim 1, wherein the second flow rate is larger than the first flow rate.   The fluidized bed system according to claim 1, further comprising a communication pipe gas supply unit that supplies a fluidizing gas to the communication pipe.

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