Loop seal operation method, loop seal, gas supply section of a circulating fluid device, and circulating fluid device

Abstract

To reduce variations in particle circulation rate even with a variation in inter-layer height difference at a circulating fluidized bed.SOLUTION: The present invention provides a method for the operation of a circulating fluidizer in which particles move between a first fluidized bed and a second fluidized bed. Into a loop seal provided between the first fluidized bed and the second fluidized bed, introduced is vibrated air by means of a gas feeder, which does not introduce air from outside.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a loop seal operation method and a loop seal.

Background Art

[0002] There is a circulating fluidization device including a circulating fluidized bed for moving particles between a plurality of layers. Since the circulating fluidized bed is used at a high temperature (for example, about several tens of °C to several hundreds of °C), a non-mechanical valve is used between the layers instead of a highly consumable mechanical valve. In the circulating fluidization device, the circulating fluidized bed includes an inlet fluidized bed for introducing particles, an outlet fluidized bed for discharging particles, and a loop seal for moving particles between the two layers. The space between the inlet fluidized bed and the outlet fluidized bed is partitioned by a flat partition plate. The loop seal is provided at an opening of the partition plate between the inlet fluidized bed and the outlet fluidized bed. The particles introduced into the inlet fluidized bed are sent to the outlet fluidized bed by the loop seal disposed between the inlet fluidized bed and the outlet fluidized bed. During the operation of the circulating fluidization device, air is respectively flowed from the lower part into the inlet fluidized bed and the outlet fluidized bed, and the particles are fluidized in each layer. Particles are introduced into the inlet fluidized bed and discharged from the outlet fluidized bed. The role of the loop seal is to flow air and particles in one direction (from the inlet fluidized bed to the outlet fluidized bed). The loop seal includes a riser for discharging particles to the outlet fluidized bed and a downcomer for flowing particles through the riser. The particles in the inlet fluidized bed enter the downcomer. Further, the loop seal includes an air (gas) injection part, and the circulation of particles is performed by adjusting the speed (gas flow rate) of injecting air (gas) into the inside. Reverse flow in the loop seal is undesirable.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

[0004] In a circulating fluidized bed, if the flow velocity of the gas injected into the loop seal is constant, the layer height difference (the difference between the particle height in the inlet fluidized bed and the particle height in the outlet fluidized bed) increases as the particle circulation velocity (the amount of particles passing through the loop seal per unit time per unit cross-sectional area) increases. Since the particle circulation amount is greatly affected by the layer height difference, it is desirable to keep the layer height difference constant in order to stabilize the operation of the circulating fluidized bed (stabilize the particle circulation amount). Furthermore, it is desirable that the particle circulation velocity does not depend on the layer height difference in order to stabilize the operation of the circulating fluidized bed (stabilize the particle circulation amount).

[0005] Figure 1 shows an example graph illustrating the relationship between the layer height difference Δh and the particle circulation velocity Gs when a gas at a constant velocity is injected into the loop seal of a circulating fluidization system. In the graph in Figure 1, the horizontal axis represents the layer height difference Δh, and the vertical axis represents the particle circulation velocity Gs. The graph in Figure 1 shows that the particle circulation velocity increases as the layer height difference increases. It also shows that the particle circulation velocity increases as the flow velocity of the gas injected into the loop seal increases. It is desirable that the particle circulation velocity does not fluctuate even when the layer height difference changes. In other words, it is desirable that the slope of the graph be small.

[0006] Furthermore, when blowing gas into the loop seal of a circulating fluid system, the gas is introduced into the circulating fluid system from an external source. Introducing gas from an external source into a circulating fluid system presents the problem that impurities contained in the gas may be incorporated into the particles of the circulating fluid system.

[0007] The present invention aims to stably and efficiently move particles in a circulating fluidized bed. . [Means for solving the problem]

[0008] To solve the above problems, the following measures will be taken. That is, the first aspect is, A method for operating a circulating fluidized bed in which particles move between a first fluidized bed and a second fluidized bed, Vibrating air is introduced into the loop seal provided between the first fluidized bed and the second fluidized bed by a gas supply unit that does not introduce air from the outside. This describes the operating method of the circulating fluid device. [Effects of the Invention]

[0009] According to the present invention, particles can be moved stably and efficiently in a circulating fluidized bed. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 shows an example of a graph illustrating the relationship between the layer height difference Δh and the particle circulation velocity Gs when gas is injected at a constant velocity into the loop seal of a circulating fluidization device. [Figure 2] Figure 2 shows an example of the configuration of a circulating fluid device according to the embodiment. [Figure 3] Figure 3 is a diagram illustrating the details of the loop seal. [Figure 4] Figure 4 shows an example of the configuration of a gas supply unit that supplies gas to the injection section of a loop seal. [Figure 5] Figure 5 shows an example of the hardware configuration of an information processing device. [Figure 6] Figure 6 shows an example of the operation flow of the circulating fluid device according to the embodiment. [Figure 7] Figure 7 shows an example of the configuration of the simulation device 300. [Figure 8] Figure 8 shows an example 1 of the stability of particle emission rate. [Figure 9] Figure 9 shows an example 2 of the stability of particle emission rate. [Figure 10] Figure 10 shows example 3 of particle emission velocity stability. [Modes for carrying out the invention]

[0011] Hereinafter, embodiments will be described with reference to the drawings. The configurations of the embodiments are examples, and the configuration of the invention is not limited to the specific configurations of the disclosed embodiments. In implementing the invention, specific configurations according to the embodiments may be appropriately employed.

[0012] 〔Embodiment〕 (Configuration Example) FIG. 2 is a diagram showing a configuration example of the circulation flow device of the present embodiment. The circulation flow device 100 in FIG. 2 includes a feeder 110, an inlet fluidized bed 120, an outlet fluidized bed 130, a loop seal 140, a gas introduction part 161, a gas introduction part 162, and a partition plate 180. The partition plate 180 is a flat plate that partitions the inlet fluidized bed 120 and the outlet fluidized bed 130. The partition plate 180 has an opening, and the loop seal 140 is installed in the opening. The inlet fluidized bed 120, the outlet fluidized bed 130, the loop seal 140, and the partition plate 180 are collectively referred to as the circulation fluidized bed. The circulation fluidized bed is an internal circulation fluidized bed. The inlet fluidized bed 120 and the outlet fluidized bed 130 are examples of the first fluidized bed and the second fluidized bed.

[0013] The feeder 110 supplies the particles to be processed in the circulation flow device 100 to the inlet fluidized bed 120. The amount of particles to be supplied is determined based on a predetermined amount or the amount of particles present in the inlet fluidized bed 120 and the outlet fluidized bed 130.

[0014] The inlet fluidized bed 120 is introduced with particles from the feeder 110. The inlet fluidized bed 120 sends the particles to the outlet fluidized bed 130 via the loop seal 140. Also, the inlet fluidized bed 120 is supplied with a gas such as air from the gas introduction part 161 to fluidize the particles in the inlet fluidized bed 120.

[0015] The outlet fluidized bed 130 is supplied with particles from the inlet fluidized bed 120 via the loop seal 140. Also, the outlet fluidized bed 130 is supplied with a gas such as air from the gas introduction part 162 to fluidize the particles in the outlet fluidized bed 130. The outlet fluidized bed 130 may be provided with a discharge part for discharging the particles to the outside.

[0016] The inlet fluidized bed 120 and the outlet fluidized bed 130 are separated by a partition plate 180. The inlet fluidized bed 120, the outlet fluidized bed 130, and the partition plate 180 are formed, for example, by processing a metal plate.

[0017] The loop seal 140 receives particles from the inlet fluidized bed 120 and discharges them to the outlet fluidized bed 130. The loop seal 140 is provided with an injection port for blowing in gas such as air to facilitate the introduction and discharge of particles. The loop seal 140 is fixed to the opening of the partition plate 180 with screws or the like. The loop seal 140 may have recesses around it that fit into the partition plate 180. The loop seal 140 and the partition plate 180 may be integrated into one unit. A gas supply unit 200 is connected to the loop seal 140.

[0018] The gas introduction section 161 supplies a gas such as air to the inlet fluidized bed 120, and fluidizes the particles in the inlet fluidized bed 120.

[0019] The gas inlet 162 supplies a gas such as air to the outlet fluidized bed 130, and fluidizes the particles in the outlet fluidized bed 130.

[0020] Figure 3 is a diagram illustrating the details of the loop seal. The loop seal 140 includes a flat plate 141 that closes the opening of the partition plate 180, a first member 143, a second member 144, and a blowing section 147. The flat plate 141 is provided with an opening 142, allowing electrical connection between the inlet fluidized bed 120 side and the outlet fluidized bed 130 side. Furthermore, the flat plate 141 and the first member 143 form a downcomer section 145, and the flat plate 141 and the second member 144 form a riser section 146. The downcomer section 145 is a passage for particles provided from the opening 142 to the inlet fluidized bed 120 side. The riser section 146 is a passage for particles provided from the opening 142 to the outlet fluidized bed 130 side. The flat plate 141, the first member 143, and the second member 144 are formed from, for example, metal, resin, etc.

[0021] The first member 143 and the second member 144 may be integrated into a single member. Alternatively, the first member 143 and the second member 144 may be composed of two or more members.

[0022] The downcomer section 145 is located on the inlet fluidized bed 120 side, extending upward from the opening 142 of the flat plate 141, and is open at its upper end to allow particle introduction. The passage of the downcomer section 145 gradually narrows from its upper end towards the opening of the flat plate. The riser section 146 is located on the outlet fluidized bed 130 side, extending upward from the opening 142 of the flat plate 141, and is open at its upper end to allow particle discharge. The downcomer section 145 or the riser section 146 is provided with an inlet 147, which is a gas (air) inlet.

[0023] The injection section 147 is located at the bottom of the riser section 146 and can introduce gas into the riser section 146 and discharge gas from the riser section 146. The gas introduced and discharged from the injection section 147 promotes the movement of particles from the inlet fluidized bed 120 to the outlet fluidized bed 130. The injection section may be located elsewhere on the loop seal 140. A mesh made of metal or the like with a mesh size smaller than the particle size is provided between the riser section 146 and the injection section 147. This mesh allows for the movement of particles. The outflow of particles from the riser section 146 to the blowing section 147 is suppressed. The gas supply section 200 is connected to the blowing section 147.

[0024] Figure 4 shows an example configuration of a gas supply unit that supplies gas to the injection port of a loop seal. The gas supply unit 200 may be included in the circulating fluid device 100, or it may exist as a separate device from the circulating fluid device 100. The loop seal 140 may also include the gas supply unit 200. The gas supply unit 200 includes a gas pipe 210, a box 220, a speaker 230, an amplifier 240, and a function synthesizer 250. The injection port 147 of the loop seal 140 and the box 220 are electrically connected by the gas pipe 210. When the gas in the box 220 vibrates due to the speaker 230, gas is injected into the loop seal 140 (gas introduction) or drawn from the loop seal 140 towards the gas pipe 210 (gas discharge) in response to the vibration. The introduction and discharge of gas to and from the loop seal 140 via the injection port 147, gas pipe 210, etc., is also called the introduction of vibrating gas (vibrating air).

[0025] The gas pipe 210 is a pipe that electrically connects the inlet 147 of the loop seal 140 to the box 220. The gas pipe 210 is, for example, a rubber pipe or a metal pipe. The boundary between the gas pipe 210 and the inlet 147 is sealed to prevent the gas inside from leaking out. The boundary between the gas pipe 210 and the box 220 is sealed to prevent the gas inside from leaking out.

[0026] Box 220 is a box that houses the speaker 230. The inside of box 220 is hollow. The external shape of box 220 is, for example, a rectangular parallelepiped. Box 220 is made of, for example, acrylic resin. The material of box 220 can be any material that does not allow gas to pass through. Box 220 has two openings. A gas pipe 210 is connected to one of the openings of box 220. The speaker 230 is fitted into the other opening of box 220. A part of the speaker 230, including the diaphragm, is placed inside box 220. The boundary between speaker 230 and box 220 is sealed so that the gas inside box 220 does not escape from box 220 through the boundary. As a result, no gas is introduced from the outside into the gas supply unit 200.

[0027] The speaker 230 outputs sound that vibrates the gas inside the box 220 based on a signal from the amplifier 240. The speaker 230 includes a diaphragm and a vibrator, including an electromagnet. The signal from the amplifier 240 causes the vibrator of the speaker 230 to vibrate, and the vibration of the vibrator is transmitted to the diaphragm of the speaker 230, causing the gas inside the box 220 to vibrate as the diaphragm vibrates. When the gas inside the box 220 vibrates, the gas moves back and forth between the inlet 147 and riser 146 of the loop seal 140, which is connected to the box 220 via the gas pipe 210. In other words, the vibration of the speaker 230's diaphragm pushes gas out of the box 220 or draws gas into the box 220. Other elements that vibrate the gas inside the box 220 may be used instead of the speaker 230. The speaker 230 is an example of a vibrating element. By using speaker 230, it is possible to generate vibrating air at a higher frequency (e.g., 4 Hz or higher) compared to using solenoid valves or the like.

[0028] The amplifier 240 amplifies the signal from the function synthesizer 250 at a predetermined amplification factor and outputs it to the speaker 230.

[0029] The function synthesizer 250 controls the period, amplitude, waveform, etc., of the vibration output from the speaker 230. The function synthesizer 250 outputs a signal to be amplified by the amplifier 240. The function synthesizer 250 is implemented, for example, by a computer. The function synthesizer 250 may also control the amplification factor of the amplifier 240. The output waveform is, for example, a sine wave. By using the speaker 230, amplifier 240, and function synthesizer 250, it is possible to output a waveform of any frequency, amplitude, and waveform. This makes it easier to apply force (introduction of vibrating air).

[0030] The Function Synthesizer 250 is compatible with PCs (Personal Computers) and workstations. This can be achieved using dedicated or general-purpose computers such as workstations (WS), or electronic devices equipped with computers, such as smartphones, mobile phones, tablet devices, car navigation systems, and personal digital assistants (PDAs).

[0031] Figure 5 shows an example of the hardware configuration of an information processing device. The information processing device shown in Figure 5 has the configuration of a typical computer. The function synthesizer 250 is implemented by the information processing device 90 as shown in Figure 5. The information processing device 90 in Figure 5 has a processor 91, memory 92, storage unit 93, input unit 94, output unit 95, and communication control unit 96. These are connected to each other by a bus. The memory 92 and storage unit 93 are computer-readable recording media. The hardware configuration of the information processing device is not limited to the example shown in Figure 5, and components may be omitted, replaced, or added as appropriate.

[0032] The information processing device 90 can achieve a function that matches a predetermined purpose by having the processor 91 load a program stored on the recording medium into the working area of ​​the memory 92 and execute it, thereby controlling each component through the execution of the program.

[0033] Processor 91 is, for example, a CPU (Central Processing Unit) or a DSP (Digital Signal Processor).

[0034] Memory 92 includes, for example, RAM (Random Access Memory) and ROM (Read Only Memory). Memory 92 is also called main memory.

[0035] The memory unit 93 may be, for example, an EPROM (Erasable Programmable ROM) or a hard disk. It is a drive (HDD, Hard Disk Drive). Also, the storage unit 93 is a removable media This may include a portable recording medium. Removable media include, for example, USB (Universal Serial Bus) memory, or disk recording media such as CD (Compact Disc) or DVD (Digital Versatile Disc). The storage unit 93 is also called a secondary storage device.

[0036] The storage unit 93 stores various programs, various data, and various tables on a recording medium in a read-write manner. The storage unit 93 stores the operating system (OS), various programs, various tables, etc. The information stored in the storage unit 93 may also be stored in the memory 92. Conversely, the information stored in the memory 92 may also be stored in the storage unit 93.

[0037] An operating system is software that acts as an intermediary between software and hardware, manages memory space, manages files, and manages processes and tasks. The operating system includes a communication interface. The communication interface is a program that exchanges data with other external devices connected via the communication control unit 96. These external devices include, for example, other computers and external storage devices.

[0038] The input unit 94 includes a keyboard, pointing device, wireless remote control, touch panel, etc. The input unit 94 may also include video or image input devices such as a camera, and audio input devices such as a microphone.

[0039] The output section 95 is an LCD (Liquid Crystal Display) and an EL (Electroluminescence) panel. This includes display devices such as screens, CRT (Cathode Ray Tube) displays, and PDP (Plasma Display Panel), as well as output devices such as printers. The output unit 95 may also include audio output devices such as speakers.

[0040] The communication control unit 96 connects to other devices and controls communication between the information processing device 90 and other devices. The communication control unit 96 is, for example, a LAN (Local Area Network) interface board, a wireless communication circuit for wireless communication, or a communication circuit for wired communication. The LAN interface board and wireless communication circuit are connected to a network such as the Internet.

[0041] (Example of operation) Figure 6 shows an example of the operation flow of the circulating fluid bed of this embodiment. A predetermined amount of particles is introduced in advance into the inlet fluid bed 120 and the outlet fluid bed 130 of the circulating fluid bed 100.

[0042] In S101, the gas inlet 161 of the circulating fluidizer 100 supplies gas from the bottom of the inlet fluidized bed 120 to fluidize the particles in the inlet fluidized bed 120. The gas inlet 162 supplies gas from the bottom of the outlet fluidized bed 130 to fluidize the particles in the outlet fluidized bed 130. The gas is, for example, air. When gas is supplied, the particles become fluidized. Since it takes time for the fluidized state of the particles to stabilize, for example, a wait of 2 minutes is performed after the gas supply begins.

[0043] In S102, the gas supply unit 200 vibrates the gas inside the box 220. The vibration of the gas inside the box 220 causes the gas to move back and forth between the injection section 147 and the riser section 146 of the loop seal 140, which is connected to the box 220 via the gas pipe 210. That is, the introduction of gas into the riser section 146 via the injection section 147 and the discharge of gas from the riser section 146 are repeated. The frequency and amplitude of the output of the speaker 230 that vibrates the gas are controlled by the function synthesizer 250. The period and amount of gas introduction and discharge depend on the frequency and amplitude of the output of the speaker 230. The vibration of the gas inside the box 220 promotes the movement of particles from the inlet fluidized bed 120 to the outlet fluidized bed 130.

[0044] In S103, the feeder 110 supplies particles to the inlet fluidized bed 120 at a predetermined rate. In S102, when gas introduction and discharge begin from the injection section 147, the number of particles in the inlet fluidized bed 120 decreases. As the number of particles decreases, the particle height (the height of the liquid surface of the particles) in the inlet fluidized bed 120 decreases, making it difficult to supply particles to the outlet fluidized bed 130. Therefore, the feeder 110 supplies particles to the inlet fluidized bed 120. The supply of particles by the feeder 110 may be continuous or intermittent. The operations in S102 and S103 may be reversed or simultaneous.

[0045] Immediately after the start of gas oscillation in box 220, the particle circulation velocity is unstable. After a while (for example, after 6 minutes), the operation of the circulation fluidizer 100 stabilizes. The particle circulation velocity can be calculated by measuring the amount of particles passing through the loop seal 140. A well-known method can be used to measure the amount of particles. There are no limitations on the method of measuring particles.

[0046] Here, by changing the conditions for gas oscillation in box 220 (frequency, amplitude of speaker 230 output, etc.) and the conditions for particle supply by the feeder, and repeating the operation from S102 onwards, the particle circulation velocity can be calculated under other conditions. By changing the conditions and calculating the particle circulation velocity, better conditions (such as gas supply timing) that reduce fluctuations in particle circulation velocity can be determined.

[0047] (Example of measurement results) Here, we present an example of measurement results from a simulated device 300 that simulates the above-mentioned circulating fluid device 100. I will explain about that.

[0048] Figure 7 shows an example configuration of the simulation device 300. The simulation device 300 includes a standpipe 310, a column 320, and a discharge pipe 330. The standpipe 310 is connected to the lower side of the column 320, and the discharge pipe 330 is connected to the upper side of the column 320. The standpipe 310 corresponds to the downcomer section 145. The column 320 corresponds to the riser section 146. Here, the dimensions of the standpipe 310 are 10 mm wide and 2.5 mm deep. The dimensions of the column 320 are 25 mm wide, 40 mm high, and 2.5 mm deep. The dimensions are not limited to these.

[0049] A gas pipe 210 of the gas supply unit 200 is connected to the bottom of column 320. A mesh is provided at the boundary between column 320 and gas pipe 210. The mesh size is smaller than the particle size of the particles introduced into the simulation device 300. Similar to the example above, the speaker 230 vibrates in the box 220 of the gas supply unit 200, causing gas to be introduced and discharged between column 320 and gas pipe 210. Alternatively, another gas supply unit capable of continuously supplying gas (introducing continuous air) may be connected to the bottom of column 320 instead of gas supply unit 200. The gas supply unit 200 in Figure 7 is the same as the gas supply unit 200 in Figure 4.

[0050] Particles are introduced from the standpipe 310 and accumulate in the standpipe 310 and column 320. When the particles reach the height of the discharge pipe 330 at the top of the side of column 320, the particles that have reached that height are discharged outside through the discharge pipe 330. The introduction of gas from the gas supply unit 200 pushes the particles in column 320 upward. The discharge of gas from the gas supply unit 200 and gravity push the particles downward. The introduction and discharge of gas from the gas supply unit 200 (by introducing vibrating air) promotes the movement of the particles. The difference in layer height Δh between the height of the upper end of the particles in the standpipe 310 and the height of the upper end of the particles in column 320 corresponds to the difference in layer height Δh between the height of the upper end of the particles in the inlet fluidized bed 120 and the height of the upper end of the particles in the outlet fluidized bed 130 in Figure 1. The difference in layer height Δh between the height of the upper end of the particles in the standpipe 310 and the height of the upper end of the particles in the column 320 is considered positive when the height of the upper end of the particles in the standpipe 310 is higher than the height of the upper end of the particles in the column 320. Here, the frequency of the output of the speaker 230 (frequency of the vibrating air) is set to 4 Hz or more and 10 Hz or less. Between 4 Hz and 10 Hz, the particles in the column 320 vibrate up and down, and particle movement is suitably promoted. Below 4 Hz, the amplitude of the vertical vibration of the particles in the column 320 becomes small, and the amount of particle movement is small, making it unsuitable. Also, above 10 Hz, the particles in the column 320 vibrate up and down less easily, and the amount of particle movement is small, making it unsuitable.

[0051] <Stability of particle emission rate> Figure 8 shows an example 1 of particle discharge velocity stability. Figure 8 shows the stability of particle discharge velocity for vibrating air (average 15 Umf, 8 Hz, sine wave), continuous air (5 Umf), and continuous air (7 Umf). The particles used here are glass beads with a representative particle size of 83 μm. Particles were introduced from the standpipe 310 of the simulation apparatus 300, and vibrating air or continuous air was introduced into the column 320, and the particle discharge velocity was measured. The particle discharge velocity is expressed as the change in the layer height difference Δh per unit time. Here, Umf is the unit of gas flow velocity introduced into column 320. 1 Umf is the minimum gas flow velocity (minimum fluidization velocity) at which particles become fluid when gas is introduced into column 320. In the case of vibrating air, the average flow velocity is taken by dividing the maximum flow velocity during gas introduction in one cycle by 2.

[0052] When vibrating air or continuous air is introduced into column 320, the slope of a graph with the layer height difference Δh (cm) on the horizontal axis and the particle discharge velocity (cm / s) on the vertical axis is defined as the stability of the particle discharge velocity. Stability is considered to exist when the particle discharge velocity does not change even when the layer height difference Δh changes. In other words, the closer the value of the particle discharge velocity stability is to 0, the more stable the particle discharge velocity is considered to be. Therefore, a stable particle discharge rate is more desirable because it ensures a constant particle discharge rate. In the example in Figure 8, the particle discharge rate is more stable when vibrating air is introduced compared to when continuous air is introduced.

[0053] Figure 9 shows example 2 of particle discharge velocity stability. Figure 9 shows the change in particle discharge velocity stability due to differences in the average flow velocity of vibrating air. Figure 9 shows the particle discharge velocity stability for vibrating air (average 15 Umf), vibrating air (average 18 Umf), vibrating air (average 16 Umf), vibrating air (average 15 Umf), and continuous air (7 Umf). Here, the vibrating air was defined as an 8 Hz sine wave. The particles used here are glass beads with a typical particle size of 153 μm. In the example in Figure 9, it can be seen that the particle discharge velocity becomes more stable when the gas flow velocity (amplitude) of the vibrating air is increased. Note that a negative value for particle discharge velocity stability indicates that the particle discharge velocity increases as the layer height difference Δh decreases.

[0054] Figure 10 shows example 3 of particle discharge velocity stability. Figure 10 shows the change in particle discharge velocity stability due to differences in the frequency of the vibrating air. Figure 10 shows the particle discharge velocity stability for vibrating air (6 Hz sine wave), vibrating air (10 Hz sine wave), and continuous air (7 Umf). Here, the vibrating air was set to an average of 15 Umf. The particles used here are glass beads with a representative particle size of 153 μm. In the example in Figure 10, the value of particle discharge velocity stability became negative when the frequency of the vibrating air gas was small.

[0055] From the above, it can be seen that when supplying gas to the simulated device 300, introducing vibrating air rather than continuous air stabilizes the particle discharge rate. Therefore, it is desirable to introduce vibrating air into the loop seal 140 in the circulating fluid device 100.

[0056] (Effects and mechanisms of the embodiment) The circulating fluidizer 100 moves particles from the inlet fluidized bed 120 to the outlet fluidized bed 130 via the loop seal 140. By introducing vibrating air into the loop seal 140, fluctuations in the particle circulation velocity in the circulating fluidizer 100 can be suppressed compared to continuous gas supply. In addition, by not introducing gas from the outside into the gas supply unit 200, the contamination of the circulating fluidizer 100 with impurities can be suppressed. Furthermore, by generating vibrating air using a vibrating unit such as a speaker 230, vibrating air can be introduced at a higher frequency (e.g., 4 Hz or higher) compared to when air is introduced using a solenoid valve or the like. By introducing high-frequency vibrating air into the loop seal 140, the particles inside the loop seal 140 can be appropriately vibrated up and down, promoting particle movement.

[0057] The above embodiments and modifications can be implemented in combination whenever possible. [Explanation of Symbols]

[0058] 100 Circulating flow device 110 feeder 120 Inlet fluidized bed 130 Outlet fluidized bed 140 Loop Seals 141 Flat plate 142 Opening 143 First Member 144 Second Member 145 Downcomer section 146 Riser section 147 Blowing section 161 Gas inlet 162 Gas inlet 180 partition plates 200 Gas Supply Department 210 gas pipe 220 boxes 230 speakers 240 Amplifier 250 Function Synthesizer 300 Simulation device 310 Standpipe 320 columns 330 Discharge pipe 90 Information Processing Equipment 91 processors 92 memory 93 Memory section 94 Input section 95 Output section 96 Communication Control Unit

Claims

1. A method for operating a circulating fluidized bed in which particles move between a first fluidized bed and a second fluidized bed, A method for operating a circulating fluidized bed apparatus, wherein a gas supply unit for introducing vibrating gas into a loop seal provided between the first fluidized bed and the second fluidized bed includes a box housing a vibrating unit and a gas pipe electrically connecting the blowing unit of the loop seal and the box, the vibrating unit vibrates the gas inside the box which is electrically connected to the loop seal via the gas pipe, and in response to the vibration, the system repeatedly blows gas from the gas pipe side to the loop seal and sucks gas from the loop seal to the gas pipe side to introduce vibrating gas into the loop seal.

2. The frequency of the vibrating gas is between 4 Hz and 10 Hz. A method for operating a circulating fluid apparatus according to claim 1.

3. A gas supply unit for introducing vibrating gas into a loop seal provided between a first fluidized bed and a second fluidized bed in a circulating fluidized bed apparatus in which particles move between the first fluidized bed and the second fluidized bed, A gas pipe that connects the blowing portion and the box of the loop seal in a conductive manner, It has a vibrating part that vibrates the gas inside the box, The vibrating part vibrates the gas inside the box that is connected to the loop seal via the gas pipe, and in response to the vibration, the vibrating gas is introduced into the loop seal by repeatedly blowing gas from the gas pipe side to the loop seal and drawing gas from the loop seal back to the gas pipe side. Gas supply section of a circulating fluid system.

4. The gas supply unit according to claim 3, wherein the vibrating part has a vibrating membrane that vibrates at a predetermined frequency.

5. A circulating fluid apparatus comprising the gas supply unit according to claim 3 or 4.

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