JP7125080B2 - Operating method of circulation flow device and loop seal - Google Patents

Description

The present invention relates to a method of operating a circulatory flow device and to a loop seal.

There are circulating fluidizers that include circulating fluidized beds that move particles between layers. Since the circulating fluidized bed is used at high temperatures (e.g., several tens of degrees Celsius to several hundreds of degrees Celsius), non-mechanical valves are used between layers instead of wear-prone mechanical valves. . In a circulating fluidizer, the circulating fluidized bed comprises an inlet fluidized bed for introducing particles, an outlet fluidized bed for discharging particles, and a loop seal for moving particles between the two beds. A planar partition plate separates the inlet fluidized bed from the outlet fluidized bed. A loop seal is provided at the opening of the partition plate between the inlet fluidized bed and the outlet fluidized bed. Particles introduced into the inlet fluidized bed are sent to the outlet fluidized bed by a loop seal arranged between the inlet fluidized bed and the outlet fluidized bed. During the operation of the circulator, the inlet fluidized bed and the outlet fluidized bed are each flowed with air from below, and the particles are fluidized in each bed. Particles are introduced into the inlet fluidized bed and discharged from the outlet fluidized bed. The role of the loop seal is to allow air and particles to flow in one direction (from the inlet fluidized bed to the outlet fluidized bed). The loop seal includes a riser that discharges particles to an outlet fluidized bed and a downcomer that channels particles to the riser. Downcomers receive particles from the inlet fluidized bed. In addition, the loop seal has an air (gas) blowing port, and circulates particles by adjusting the speed of blowing air (gas) inside (gas flow speed). Backflow at the loop seal is undesirable.

JP 2012-220099 A Japanese Patent No. 3278161

In a circulating fluidized bed, when the flow rate of gas blown into the inside of the loop seal is constant, the bed height difference (inlet flow difference between the particle height of the bed and the particle height of the exit fluidized bed) increases. Since the bed height difference has a large effect on the amount of circulated particles, it is desirable to prevent the difference in bed height from fluctuating for stable operation of the circulating fluidized bed (stabilization of the amount of circulated particles). For stable operation of the circulating fluidized bed (stable particle circulation amount), it is desirable that the particle circulation speed does not depend on the bed height difference.

FIG. 1 is a diagram showing an example of a graph of the relationship between the bed height difference Δh and the particle circulation speed Gs when gas is blown at a constant speed into the loop seal of the circulation flow device. The horizontal axis of the graph in FIG. 1 is the layer height difference Δh, and the vertical axis is the particle circulation speed Gs. It can be seen from the graph in FIG. 1 that the particle circulation speed increases as the layer height difference increases. Also, it can be seen that the higher the flow rate of the gas blown into the loop seal, the faster the particle circulation speed. It is desirable that the particle circulation velocity does not fluctuate even if the bed height difference changes.

An object of the present invention is to move particles stably and efficiently in a circulating fluidized bed.

In order to solve the above problems, the following means are adopted.
That is, the first aspect is
A method of operating a circulatory flow device in which particles move between a first fluidized bed and a second fluidized bed, comprising:
A loop seal provided between the first fluidized bed and the second fluidized bed is periodically supplied with a gas supplied to promote movement of the particles;
A method of operating a circulating fluid device.
A second aspect is
A loop seal provided between the first fluidized bed and the second fluidized bed of a circulation fluidized device in which particles move between the first fluidized bed and the second fluidized bed,
a downcomer portion provided on the side of the first fluidized bed and serving as a passage through which particles are introduced from the first fluidized bed;
a riser section provided on the second fluidized bed side and serving as a passage through which particles are discharged to the second fluidized bed;
a particle reservoir provided below the riser on the second fluidized bed side;
a blowing port for supplying gas to the particle reservoir;
A loop seal with

According to the present invention, particles can be moved stably and efficiently in a circulating fluidized bed.

FIG. 1 is a diagram showing an example of a graph of the relationship between the bed height difference Δh and the particle circulation speed Gs when gas is blown at a constant speed into the loop seal of the circulation flow device. FIG. 2 is a diagram showing a configuration example of the circulation flow device of the embodiment. FIG. 3 is a diagram illustrating the details of the loop seal. FIG. 4 is a diagram showing a configuration example of a gas supply unit that supplies gas to the blowing port of the loop seal. FIG. 5 is a diagram illustrating a hardware configuration example of an information processing apparatus. FIG. 6 is a diagram showing an example of an operation flow of the circulation flow device of the embodiment. FIG. 7 is a diagram showing an example of the particle size distribution of particles used in the circulatory flow device 100. As shown in FIG. FIG. 8 is a diagram showing an example of dependence of changes in particle circulation speed due to changes in bed height on the blow port. FIG. 9 is a diagram showing an example of gas velocity dependence of changes in particle circulation velocity due to changes in bed height. FIG. 10 is a diagram showing an example of gas supply frequency dependence of changes in particle circulation velocity due to changes in bed height. FIG. 11 is a diagram showing layer height difference dependency of particle circulation velocity. FIG. 12 is a diagram for explaining a modification of the loop seal. FIG. 13 is a diagram showing layer height difference dependency of particle circulation velocity. FIG. 14 is a diagram showing an example of pulse width dependence of gas supply for changes in particle circulation velocity due to changes in bed height.

Embodiments will be described below with reference to the drawings. The configuration of the embodiment is an example, and the configuration of the invention is not limited to the specific configuration of the disclosed embodiment. In carrying out the invention, a specific configuration according to the embodiment may be adopted as appropriate.

[Embodiment]
(Configuration example)
FIG. 2 is a diagram showing a configuration example of the circulation flow device of this embodiment. Circulating flow device 10 of FIG.
0 includes a feeder 110 , an inlet fluidized bed 120 , an outlet fluidized bed 130 , a loop seal 140 , a gas inlet 161 , a gas inlet 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 a circulating fluidized bed. The circulation fluidized bed is an internal circulation fluidized bed.

The feeder 110 supplies particles to be processed in the circulatory flow device 100 to the inlet fluidized bed 120 . The amount of particles to be supplied is determined based on a predetermined amount, the amount of particles present in the inlet fluidized bed 120 and the outlet fluidized bed 130, and the like.

Inlet fluidized bed 120 is fed with particles from feeder 110 . Inlet fluidized bed 120 passes particles through loop seal 140 to outlet fluidized bed 130 . In addition, 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 .

Outlet fluidized bed 130 is fed particles from inlet fluidized bed 120 through 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 particles to the outside.

A partition plate 180 partitions between the inlet fluidized bed 120 and the outlet fluidized bed 130 . The inlet fluidized bed 120, the outlet fluidized bed 130, and the partition plate 180 are formed, for example, by processing metal plates.

Loop seal 140 receives particles from inlet fluidized bed 120 and discharges the particles to outlet fluidized bed 130 . The loop seal 140 is provided with a blowing port for blowing gas such as air to promote introduction and discharge of particles. The loop seal 140 is fixed to the opening of the partition plate 180 with screws or the like. A recess that fits into the partition plate 180 may be provided around the loop seal 140 . The loop seal 140 and the partition plate 180 may be integrated.

The gas introduction part 161 supplies gas such as air to the inlet fluidized bed 120 to fluidize the particles in the inlet fluidized bed 120 .

The gas introduction part 162 supplies gas such as air to the outlet fluidized bed 130 to fluidize the particles in the outlet fluidized bed 130 .

FIG. 3 is a diagram illustrating the details of the loop seal. The loop seal 140 includes a flat plate 141 closing the opening of the partition plate 180, a first member 143, a second member 144, an air inlet 147, and an air outlet 148. As shown in FIG. The flat plate 141 is provided with an opening 142 to allow communication between the inlet fluidized bed 120 side and the outlet fluidized bed 130 side. A downcomer portion 145 is formed by the flat plate 141 and the first member 143 , and a riser portion 146 is formed by the flat plate 141 and the second member 144 . The downcomer portion 145 is a passage for particles provided from the opening portion 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 made of metal, resin, or the like, for example.

The first member 143 and the second member 144 may be integrated into one member. Also, the first member 143 and the second member 144 may be composed of two or more members.

The downcomer portion 145 is provided upward from the opening 142 of the flat plate 141 on the inlet fluidized bed 120 side, and is open at the upper end so that particles can be introduced. The passage of the downcomer portion 145 gradually narrows from the upper end to the opening of the flat plate. Also, the riser section 146 is provided upward from the opening 142 of the flat plate 141 on the outlet fluidized bed 130 side, and is open at the upper end so that the particles can be discharged. The downcomer portion 145 or the riser portion 146 is provided with an air blowing port 147 and an air blowing port 148, which are air blowing ports.

The blowing port 147 is provided at the lower portion of the downcomer portion 145, and can blow gas laterally (toward the opening 142). The blowing port 148 is provided at the bottom of the riser section 146 and can blow gas upward into the riser section 146 . The air blown from the blowing port 147 and the blowing port 148 promotes introduction and discharge of particles. The blow port may be provided at other locations on the loop seal 140 .

FIG. 4 is a diagram showing a configuration example of a gas supply unit that supplies gas to the blowing port of the loop seal. The gas supply unit 200 may be included in the fluid circulation device 100 or may exist as a separate device from the fluid circulation device 100 . The gas supply unit 200 includes an electromagnetic valve 210, a needle valve 220, a pressure tank 230, and a numerical controller 240. The blow port 147 and the like of the loop seal 140 and the solenoid valve 210 are electrically connected by a gas pipe or the like. Electromagnetic valve 210 and needle valve 220 are electrically connected by a gas pipe or the like. Needle valve 220 and pressure tank 230 are electrically connected by a gas pipe or the like. The amount of gas discharged from the pressure tank 230 is adjusted by the needle valve 220 and the timing of the supply is adjusted by the electromagnetic valve 210 .

Electromagnetic valve 210 controls the supply of gas (such as air) from pressure tank 230 to blow port 147 and the like by opening and closing the valve between needle valve 220 and blow port 147 and the like. The opening and closing of the solenoid valve 210 is controlled by the numerical controller 240 . The valves of the solenoid valve 210 are, for example, periodically (pulsedly) opened and closed. When the valve of solenoid valve 210 remains open, gas is supplied continuously. The solenoid valve 210 and all the blowing ports may be connected so that gas is supplied to all the blowing ports at the same time, or a switching valve may be provided between the solenoid valve and each blowing port to supply gas. You may enable it to change the blowing port which carries out arbitrarily. Alternatively, the gas supply unit 200 may be provided for each blowing port, and gas supply may be controlled for each blowing port. Gas is supplied in pulses by opening and closing the electromagnetic valve 210 in pulses. Here, the pulse supply of gas refers to repeating the supply of gas for a predetermined period of time and the supply of gas being stopped for a predetermined period of time. A period of time from the start of gas supply to the stop of gas supply to the start of the next gas supply is defined as one cycle. The reciprocal of the period of pulse supply is the frequency of pulse supply.

Needle valve 220 controls the amount of gas supplied from pressure tank 230 to inlet 147 and the like.

The pressure tank 230 discharges the gas supplied to the blowing port 147 and the like. The gas discharged from the pressure tank 230 is air, for example.

Numerical control unit 240 controls the opening/closing timing of electromagnetic valve 210 . Numerical controller 240 is implemented by, for example, a computer. The numerical controller 240 may control the needle valve 220 to adjust the gas supply amount (gas flow velocity).

The numerical control unit 240 is a PC (Personal Computer), a dedicated or general-purpose computer such as a workstation (WS, Work Station), or an electronic device equipped with a computer, a smartphone, a mobile phone, a tablet terminal, a car navigation device. , P
It can be implemented using a dedicated or general-purpose computer such as a DA (Personal Digital Assistant).

FIG. 5 is a diagram illustrating a hardware configuration example of an information processing apparatus. The information processing apparatus shown in FIG. 5 has the configuration of a general computer. Numerical control unit 240 is realized by information processing device 90 as shown in FIG. The information processing device 90 of FIG. 5 has a processor 91 , a memory 92 , a storage section 93 , an input section 94 , an output section 95 and a communication control section 96 . These are connected to each other by buses. The memory 92 and storage unit 93 are computer-readable recording media. The hardware configuration of the information processing apparatus is not limited to the example shown in FIG. 5, and components may be omitted, replaced, or added as appropriate.

The processor 91 loads a program stored in a recording medium into a work area of a memory 92 and executes the program, and the information processing apparatus 90 is configured to meet a predetermined purpose by controlling each component and the like through the execution of the program. function can be realized.

The processor 91 is, for example, a CPU (Central Processing Unit) or a DSP (Digital Signal Processor).

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

The storage unit 93 is, for example, an EPROM (Erasable Programmable ROM) or a hard disk drive (HDD). Also, the storage unit 93 can include a removable medium, that is, a portable recording medium. Removable media are, for example, USB (Universal Serial Bus) memories, or disc recording media such as CDs (Compact Discs) and DVDs (Digital Versatile Discs). The storage unit 93 is also called a secondary storage device.

The storage unit 93 stores various programs, various data, and various tables in a recording medium in a readable and writable manner. The storage unit 93 stores an operating system (OS), various programs, various tables, and the like. Information stored in the storage unit 93 may be stored in the memory 92 . Information stored in the memory 92 may also be stored in the storage unit 93 .

An operating system is software that mediates 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 . External devices and the like include, for example, other computers, external storage devices, and the like.

The input unit 94 includes a keyboard, pointing device, wireless remote controller, touch panel, and the like. Also, the input unit 94 can include a video or image input device such as a camera, or an audio input device such as a microphone.

The output unit 95 includes a display device such as an LCD (Liquid Crystal Display), an EL (Electroluminescence) panel, a CRT (Cathode Ray Tube) display, a PDP (Plasma Display Panel), and an output device such as a printer. Also, the output unit 95 can include an audio output device such as a speaker.

The communication control unit 96 connects to another device and controls communication between the information processing device 90 and the other device. 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.

(Operation example)
FIG. 6 is a diagram showing an example of the operation flow of the circulatory flow device of this embodiment. A predetermined amount of particles is introduced in advance into the inlet fluidized bed 120 and the outlet fluidized bed 130 of the circulatory flow device 100 .

In S<b>101 , the gas introduction part 161 of the fluid circulation device 100 supplies gas from the bottom of the inlet fluidized bed 120 to fluidize the particles in the inlet fluidized bed 120 . Also, the gas introduction part 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. The particles are fluidized when the gas is supplied. Since it takes time to stabilize the state of fluidization of the particles, for example, wait for two minutes after starting the gas supply.

In S<b>102 , the gas supply unit 200 supplies gas (for example, air) to the blowing port 147 of the loop seal 140 of the circulation flow device 100 . The amount of supply is adjusted by a needle valve 220 and the timing of supply is controlled by an electromagnetic valve 210 controlled by a numerical controller 240 . The electromagnetic valve 210 periodically supplies gas by, for example, periodically opening and closing the valve. When the gas is supplied, the gas is discharged from the blowing port 147 or the like to which the gas is supplied. Exhausting the gas facilitates the movement of particles from the inlet fluidized bed 120 to the outlet fluidized bed 130 .

In S103, the feeder 110 supplies particles to the inlet fluidized bed 120 at a predetermined rate. In S102, when the gas is supplied from the blowing port 147 or the like, the particles in the inlet fluidized bed 120 are reduced. As the number of particles decreases, the height of the particles in the inlet fluidized bed 120 (height of the liquid surface of the particles) decreases, making it difficult for the particles to be supplied to the outlet fluidized bed 130 . supply. The supply of particles by feeder 110 may be continuous or intermittent. The operations of S102 and S103 may be interchanged or simultaneous.

In S104, the process waits until the operation of the circulation flow device 100 stabilizes. Immediately after the gas supply to the blowing port 147 of the loop seal 140 or the like is started, the particle circulation speed is not stabilized, so it waits for a while. The standby time is, for example, 6 minutes.

At S<b>105 , the circulation flow device 100 calculates the particle circulation speed by measuring the amount of particles passing through the loop seal 140 . A well-known method is used for measuring the amount of particles. There is no limitation on the method of measuring particles.

Here, the conditions for supplying gas to the blowing port 147 of the loop seal 140, etc., the conditions for supplying particles by the feeder, etc. are changed, and the operations after S102 are repeated to calculate the particle circulation speed under other conditions. can do. By calculating the particle circulation speed by changing the conditions, it is possible to obtain better conditions (gas supply timing, etc.) that reduce fluctuations in the particle circulation speed.

(Example of measurement results)
Here, an example of the measurement result of the particle circulation speed by the circulation flow device 100 is shown.

<Particles used>
FIG. 7 is a diagram showing an example of the particle size distribution of particles used in the circulatory flow device 100. As shown in FIG. In the graph of FIG. 7, the horizontal axis indicates the particle size of the particles used, and the vertical axis indicates the proportion of the particles. Here, glass beads were used as the particles. The minimum fluidization velocity u _mf of the particles is 0.042 m/s, the porosity ε is 0.433, and the particle true density ρ is 2480 kg/m ³ . Moreover, the average particle diameter is 196 μm.

<Dependence of change in particle circulation speed due to change in layer height on inlet>
FIG. 8 is a diagram showing an example of dependence of changes in particle circulation speed due to changes in bed height on the blow port. Here, a comparison is made between the case where the gas is continuously supplied to the loop seal 140 and the case where the gas is supplied in pulses at 0.5 Hz. Here, the velocity of the gas discharged from the blowing port was eight times the minimum fluidization velocity u _mf (8u _mf ). The comparison is also made for the case of using the blow-in port 147 and the blow-in port 148 as gas blow-in ports. In the case of continuous supply, the change in particle circulation velocity due to the change in layer height difference is greater than in the case of pulse supply. That is, in the case of continuous supply, when the bed height difference changes, the particle circulation velocity also changes greatly. On the other hand, in the case of pulse supply, the value is smaller than in the case of continuous supply. That is, in the case of pulse supply, even if the layer height difference changes, the particle circulation velocity does not change significantly. In the pulse supply, when the blow port 148 is used, the change in the particle circulation speed due to the change in the layer height difference is about the same as when the blow port 147 is used. The air blown from the blow port 147 may flow not only in the direction of the riser portion 146 but also in the direction of the downcomer portion 145 due to the influence of the wall in the direction in which the air is blown from the blow port 147 . When the air flows in the direction of the downcomer portion 145, the particles flow backward. On the other hand, the air blown from the blowing port 148 hardly flows into the downcomer portion 145 . Therefore, it is more preferable to use the blow port 148 .

<Gas velocity dependence of change in particle circulation velocity due to change in layer height>
FIG. 9 is a diagram showing an example of gas velocity dependence of changes in particle circulation velocity due to changes in bed height. Here, a comparison is made between the case where the gas is continuously supplied to the loop seal 140 and the case where the gas is supplied in pulses at 0.5 Hz. Here, the blow port 148 was used. In the case of continuous supply, the change in particle circulation velocity due to the change in layer height difference is greater than in the case of pulse supply. Also, in the pulse supply, when the gas velocity is set to 2 _μmf , the change in the particle circulation velocity due to the change in the layer height difference is the smallest.

<Frequency dependence of gas supply for change in particle circulation velocity due to change in layer height>
FIG. 10 is a diagram showing an example of gas supply frequency dependence of changes in particle circulation velocity due to changes in bed height. Here, the case of continuous gas supply to the loop seal 140 and the case of pulse gas supply are compared. Here, the blow port 148 was used. Here, the velocity of the gas discharged from the blowing port was eight times the minimum fluidization velocity u _mf (8u _mf ). In the case of pulse supply, the frequency of pulse supply was changed to 1.0 Hz, 0.5 Hz, 0.25 Hz, and 0.1 Hz. It can be seen that the lower the pulse supply frequency, the smaller the change in the particle circulation velocity due to the change in the layer height difference. In order to suppress fluctuations in the particle circulation speed, it is preferable to set the pulse supply frequency to 0.5 Hz or less.

<Dependence of particle circulation velocity on layer height difference>
FIG. 11 is a diagram showing layer height difference dependency of particle circulation velocity. Here, the case of continuous gas supply to the loop seal 140 and the case of pulse gas supply are compared. Here, the blow port 148 was used. Here, the velocity of the gas discharged from the blowing port was eight times the minimum fluidization velocity u _mf (8u _mf ). In the case of pulse supply, the frequency was set to 0.5 Hz. It can be seen that the change in the particle circulation speed with respect to the change in the bed height difference is smaller in the pulse supply than in the continuous supply. That is, it can be seen that the pulse supply reduces the fluctuation of the particle circulation speed.

<summary>
From the above, it can be seen that when the gas is supplied to the loop seal 140, the particle circulation speed is stabilized by pulse supply rather than continuous supply. Therefore, it is desirable to pulse the gas to the loop seal 140 in the circulation flow device 100 .

(Modification)
FIG. 12 is a diagram for explaining a modification of the loop seal. A loop seal 340 in FIG. 12 is used in place of the loop seal 140 in the circulatory flow device 100 . The loop seal 340 includes a flat plate 341 closing the opening of the partition plate 180 , a first member 343 , an air inlet 347 and an air outlet 348 . The flat plate 341 is provided with an opening 342 to allow communication between the inlet fluidized bed 120 side and the outlet fluidized bed 130 side. A downcomer portion 345 , a riser portion 346 and a particle reservoir portion 350 are formed by the flat plate 341 and the first member 343 . The downcomer portion 345 is a passage for particles provided from the opening portion 342 to the inlet fluidized bed 120 side. The riser section 346 is a passage for particles provided from the opening 342 to the outlet fluidized bed 130 side. Particle reservoir 350 is provided below riser 346 . The flat plate 341 and the first member 343 are made of metal, resin, or the like, for example. The first member 343 may be composed of two or more members.

The downcomer portion 345 is provided upward from the opening 342 of the flat plate 341 on the side of the inlet fluidized bed 120, and is open at the upper end so that particles can be introduced. The passage of the downcomer portion 345 gradually narrows from the upper end to the opening of the flat plate. The downcomer portion 345 is provided with an air blowing port 347 that is an air blowing port.

The riser section 346 is provided upward from the opening 342 of the flat plate 341 on the outlet fluidized bed 130 side, and is open at the upper end so that the particles can be discharged. A particle reservoir 350 is provided below the riser 346 .

The particle reservoir 350 is provided downward on the outlet fluidized bed 130 side and below the riser 346 provided upward from the opening 342 of the flat plate 341 . Particles that have not risen in the riser section 346 accumulate in the particle reservoir section 350 . A blowing port 348 that is an air blowing port is provided in the lower part of the particle reservoir 350 .

The blowing port 347 is provided at the lower portion of the downcomer portion 345, and can blow gas laterally (toward the opening 342). The blowing port 348 is provided at the lower part of the particle reservoir 350, and can blow gas in the lateral direction. The air blown from the blowing port 347 and the blowing port 348 promotes introduction and discharge of particles. The blow port may be provided at other locations on the loop seal 340 . For example, a blowing port may be provided at the bottom of the particle reservoir 350 like the blowing port 148 to blow gas upwards of the particle reservoir 350 and the riser 346 .

(Example of measurement result of modified example)
<Dependence of particle circulation velocity on layer height difference>
FIG. 13 is a diagram showing layer height difference dependency of particle circulation velocity. Here, a comparison is made for the case where the gas is pulse-supplied to the blowing port 148 of the loop seal 140 and the blowing port 348 of the loop seal 340 . Here, the velocity of the gas discharged from the blowing port was eight times the minimum fluidization velocity u _mf (8u _mf ). The frequency of pulse supply was set to 0.5 Hz. It can be seen that the loop seal 340 has a higher particle circulation velocity than the loop seal 140 . That is, the loop seal 340 having the particle reservoir 350 can move particles more efficiently. Therefore, it is more desirable to use the blow port 348 of the loop seal 340 . When the height of the particles in the outlet fluidized bed does not reach the upper end of the riser part 346, the height of the particles in the outlet fluidized bed is the height of the particles in the riser part 346 (the height from the lower end of the outlet fluidized bed). ).

<Pulse width dependence of gas supply for change in particle circulation velocity due to change in bed height>
FIG. 14 is a diagram showing an example of pulse width dependence of gas supply for changes in particle circulation velocity due to changes in bed height. Here, the case where the gas is continuously supplied to the blowing port 348 of the loop seal 340 and the pulse supply is performed while changing the pulse width is compared. Here, the velocity of the gas discharged from the blowing port was eight times the minimum fluidization velocity u _mf (8u _mf ). In the case of pulse supply, the frequency of pulse supply was set to 0.5 Hz (period of 2 s). In the case of pulse supply, the time (pulse width) for supplying gas in one cycle was changed to 1 s, 0.5 s, and 0.3 s. It can be seen that the smaller the pulse width of the pulse supply, the smaller the change in the particle circulation velocity due to the change in the layer height difference. In order to suppress variations in the particle circulation speed, it is preferable to set the pulse width of the pulse supply to 0.3 s or less.

(Action and effect of embodiment)
The circulator 100 moves the particles in the inlet fluidized bed 120 to the outlet fluidized bed 130 via the loop seal 140 (or loop seal 340). By pulse-supplying (periodically supplying) the gas to the loop seal 140 (or the loop seal 340), fluctuations in the particle circulation speed in the circulatory flow device 100 can be suppressed compared to continuous gas supply. Further, by providing the particle reservoir 350 below the riser 346 like the loop seal 340, the particle circulation speed in the circulatory flow device 100 can be further increased. By providing the particle reservoir 350 , particles can be moved more efficiently between the inlet fluidized bed 120 and the outlet fluidized bed 130 .

The above embodiments and modifications can be implemented in combination as much as possible.

90: information processing device
91: Processor
92: Memory
93: storage unit
94: input section
95: output section
96: Communication control unit
100: circulation flow device
110: Feeder
120: inlet fluidized bed
130: outlet fluidized bed
140: Loop seal
141: flat plate
142: opening
143: first member
144: second member
145: Downcomer part
146: Riser part
147: Inlet
148: Inlet
161: Gas introduction part
162: Gas introduction part
180: Partition plate
200: gas supply unit
210: Solenoid valve
220: Needle valve
230: pressure tank
240: Numerical controller
340: Loop seal
341: flat plate
342: opening
343: first member
345: Downcomer part
346: Riser part
347: Inlet
348: Inlet
350: Particle reservoir

Claims (2)

A method of operating a circulatory flow device in which particles move between a first fluidized bed and a second fluidized bed, comprising:
A loop seal provided between the first fluidized bed and the second fluidized bed , the downcomer portion being provided on the side of the first fluidized bed and serving as a passage through which particles are introduced from the first fluidized bed. a riser section provided on the second fluidized bed side and serving as a passage through which particles are discharged to the second fluidized bed; and a particle reservoir section provided on the second fluidized bed side and below the riser section. and a blowing port for supplying gas to the particle collecting portion, periodically supplying gas supplied from the blowing port to the particle reservoir portion of the loop seal to promote movement of the particles ,
The frequency of the gas periodically supplied to the blowing port of the loop seal is 0.5 Hz or less.
A method of operating a circulating flow device. A loop seal provided between the first fluidized bed and the second fluidized bed of a circulation fluidized device in which particles move between the first fluidized bed and the second fluidized bed,
a downcomer portion provided on the side of the first fluidized bed and serving as a passage through which particles are introduced from the first fluidized bed;
a riser section provided on the second fluidized bed side and serving as a passage through which particles are discharged to the second fluidized bed;
a particle reservoir provided below the riser on the second fluidized bed side;
a blowing port for periodically supplying a gas to the particle reservoir to promote movement of the particles ;
The frequency of the gas periodically supplied to the particle reservoir is 0.5 Hz or less.
loop seal.

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