Powder transport equipment and its operating method

Abstract

To provide a powder transport facility capable of suppressing deterioration in quality of powder, and to provide an operation method of the same.SOLUTION: A powder transport facility includes: a powder supply facility for supplying powder; a plurality of silos for storing a plurality of different types of powder; a supply side transport pipeline connected to the powder supply facility; a silo side transport pipeline connected to each of the plurality of silos; a pipeline switching part having a first valve capable of switching the silo side transport pipeline communicated with the supply side transport pipeline; and a powder detection device installed in the silo side transport pipeline, and for detecting powder in the silo side transport pipeline. The powder detection device is constituted by at least one of a flow meter and a thermometer.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a powder transport facility and an operation method thereof. [Background Art]

[0002] Powder such as cement manufactured through processes such as pulverization and firing may be transported from a powder supply facility to a silo using powder transport equipment in a large cement plant. For example, the following Patent Document 1 describes the use of a pressure-feed type powder transporter including a powder storage, a supply amount regulator, a discharger and a transport path as the powder transport facility. [Prior Art Documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Unexamined Patent Publication No. Hei 6-92453 [Summary of the Invention] [Problem to be Solved by the Invention]

[0004] Incidentally, in a cement plant or the like, different types of powder may be transported from one powder supply facility to each of a plurality of silos. Even in this case, it is convenient to use the pressure-feed type powder transporter as described above. In this case, if a powder transport facility is constructed by branching the transport pipe connected to the powder supply facility using a valve in the middle and connecting the branched transport pipes to a plurality of silos, powder can be transported to each silo. However, the powder transport facility constructed in this manner has room for improvement in terms of suppressing the deterioration of powder quality. An object of the present disclosure is to provide a powder transport facility capable of suppressing deterioration of powder quality and an operation method thereof. [Means for Solving the Problem]

[0005] The inventors of this disclosure diligently studied to solve the above problems. As a result, the inventors of this disclosure realized that malfunctions due to wear and other causes may occur in the valve, and in such cases, the quality of the powder in each silo may deteriorate. On the other hand, the inventors of this disclosure realized that while it is difficult to notice a malfunction in the valve from the outside, the powder flowing in the silo-side transport piping downstream of the valve can be detected by a flow meter or thermometer. Therefore, the inventors of this disclosure found that the above problems can be solved by the following disclosure.

[0006] In other words, one aspect of the present disclosure provides a powder transport system comprising: a powder supply system for supplying powder; a plurality of silos for storing a plurality of different types of powder; a supply-side transport piping connected to the powder supply system; a silo-side transport piping connected to each of the plurality of silos; a piping switching unit having a first valve capable of switching the silo-side transport piping communicating with the supply-side transport piping; and a powder detection device installed in the silo-side transport piping for detecting powder in the silo-side transport piping, wherein the powder detection device is composed of at least one of a flow meter and a thermometer. According to the powder transport equipment described above, at the piping switching section, the silo-side transport piping, which is connected to the supply-side transport piping, can be switched by the first valve to the silo-side transport piping connected to the destination silo, which is the silo to which the powder should be transported (hereinafter also referred to as the "destination silo-side transport piping"). Therefore, when powder is supplied from the powder supply equipment, the powder is transported to the destination silo through the supply-side transport piping, the piping switching section, and the destination silo-side transport piping. At this time, at the piping switching section, due to a malfunction such as wear of the first valve, some of the powder may leak into the silo-side transport piping that is not connected to the supply-side transport piping (hereinafter also referred to as the "non-destination silo-side transport piping"). Even in this case, according to this disclosure, it is possible to detect the powder in the non-destination silo-side transport piping using at least one of a flow meter and a thermometer as powder detection devices, and based on this detection of powder, it is possible to stop the transport of powder to the non-destination silo-side transport piping. Therefore, in silos connected to the transport piping on the non-destination silo side (hereinafter also referred to as "non-destination silos"), the inflow of powders of a different type from the powder to be transported to the non-destination silo (hereinafter also referred to as "different powders") is suppressed, and if the non-destination silo later becomes a destination silo, the cause of contamination by those different powders is suppressed. As a result, the powder transport equipment of this disclosure can suppress the deterioration of powder quality.

[0007] The powder transport equipment described above preferably further includes a second valve provided in the transport piping on the silo side. In this case, if powder is detected by the powder detection device in the transport piping on the non-destination silo side, the second valve can immediately suppress the inflow of the foreign powder into the non-destination silo.

[0008] The powder transport equipment described above further comprises a spare silo and spare silo-side transport piping connected to the spare silo, and the piping switching section may be configured such that the first valve can switch the silo-side transport piping, which is in communication with the supply-side transport piping, to the spare silo-side transport piping as well. In this case, if powder is detected by the powder detection device in the transport piping on the non-destination silo side, the silo-side transport piping connected to the supply-side transport piping is switched by the first valve at the piping switching section to the spare silo-side transport piping, making it possible to transport different types of powder to the spare silo.

[0009] In the above-described powder transport equipment, it is preferable that the flow meter is an ultrasonic flow meter. If the flow meter is an ultrasonic flow meter, even small amounts of powder passing through the transport piping on the non-destination silo side can be detected with high sensitivity. As a result, the inflow of foreign powders into the non-destination silo can be more effectively suppressed.

[0010] In the above-described powder transport equipment, it is preferable that the flow meter and the thermometer are installed in the portion of the silo-side transport piping that is directly connected to the piping switching section, and that the portion of the silo-side transport piping is no more than one-third of the length of the silo-side transport piping. In this case, since the flow meter and thermometer are installed at a sufficient distance from the non-transport silo, it becomes difficult to detect powder flowing from the non-transport silo due to stagnation within the silo. Therefore, the powder being transported from the powder supply equipment can be accurately detected.

[0011] The powder transport equipment described above preferably includes a branch pipe that branches off from the silo-side transport piping and a third valve installed in the branch pipe. If foreign powder unintentionally flows into the transport piping on the non-destination silo side, opening the third valve installed in the branch pipe will discharge the powder from the branch pipe. On the other hand, if no powder has flowed into the transport piping on the non-destination silo side, opening the third valve installed in the branch pipe will not discharge the powder from the branch pipe. Therefore, by further equipping the above powder transport equipment with a branch pipe and a third valve, it is easy to confirm whether foreign powder has unintentionally entered the transport piping on the non-destination silo side.

[0012] Another aspect of this disclosure is a method for operating a powder transport facility using the powder transport facility described above, comprising: a powder transport step of transporting the powder supplied from the powder supply facility to the destination silo among the plurality of silos via the supply transport facility, via the supply transport facility, via the supply transport facility, via the pipe switching unit, via the pipe switching unit, and via the silo transport piping, when powder is detected by the powder detection device in the non-destination silo transport piping, which is the silo transport piping not connected to the supply transport facility, and stopping the inflow of the powder into the non-destination silo, which is the silo connected to the non-destination silo transport piping, based on the detection. According to the operation method of the powder transport equipment described above, the silo-side transport piping, which is connected to the supply-side transport piping, is switched to the destination silo-side transport piping by a first valve at the piping switching section, and the powder supplied from the powder supply equipment is transported to the destination silo via the supply-side transport piping, the piping switching section, and the destination silo-side transport piping. At this time, at the piping switching section, a malfunction such as wear of the first valve may cause some of the powder to leak into the non-destination silo-side transport piping. Even in this case, according to this disclosure, if powder is detected in the non-destination silo-side transport piping by at least one of the flow meter and thermometer, which are powder detection devices, the inflow of powder into the non-destination silo-side transport piping is stopped, thereby suppressing the inflow of foreign powders into the non-destination silo, and preventing those foreign powders from causing contamination when the non-destination silo later becomes the destination silo. As a result, the operation method of the powder transport equipment of this disclosure can suppress the deterioration of powder quality.

[0013] In the operation method of the powder transport equipment described above, it is preferable that in the inflow stopping step, the inflow of the powder into the transport piping on the non-transport destination silo side is stopped by stopping the supply of the powder in the powder supply equipment. In this case, stopping the powder supply in the powder supply equipment can subsequently reduce the inflow of powder into the transport pipe on the non-transport destination silo side, thereby suppressing clogging of the transport pipe on the non-transport destination silo side.

[0014] In the above-described operation method of the powder transport equipment, the powder transport equipment further includes a second valve provided in the silo-side transport pipe, and in the inflow stopping step, the inflow of the powder into the non-transport destination silo-side transport pipe may be stopped by at least one of stopping the supply of the powder in the powder supply equipment and closing the second valve.

Effects of the Invention

[0015] According to the present disclosure, there are provided a powder transport apparatus capable of suppressing deterioration in powder quality and an operation method therefor.

Brief Description of Drawings

[0016] [Figure 1] FIG. 1 is a schematic diagram showing an embodiment of the powder transport apparatus according to the present disclosure. [Figure 2] FIG. 2 is a schematic diagram showing a silo-side transport pipe provided with a branch pipe.

Mode for Carrying Out the Invention

[0017] Hereinafter, embodiments of the present disclosure will be described in detail.

[0018] <Powder Transport Equipment> First, an embodiment of the powder transport equipment of the present disclosure will be described with reference to FIG. 1. FIG. 1 is a schematic diagram showing an embodiment of the powder transport equipment according to the present disclosure.

[0019] The powder transport equipment 100 shown in FIG. 1 includes a powder supply equipment 10 that supplies powder, a plurality of silos 20 for storing a plurality of different types of powder, a supply-side transport pipe 11 connected to the powder supply equipment 10, a silo-side transport pipe 21 connected to each of the plurality of silos 20, a pipe switching unit 30 formed of a first valve capable of switching which silo-side transport pipe 21 communicates with the supply-side transport pipe 11, a powder detection device 40 installed on the silo-side transport pipe 21 to detect powder in the silo-side transport pipe 21, and a second valve 50 installed on the silo-side transport pipe 21.

[0020] In FIG. 1, the supply-side transport pipe 11 and two silo-side transport pipes 21 are connected to the first valve that constitutes the pipe switching unit 30. Hereinafter, the two silos 20 used in FIG. 1 may be referred to as silo 20A and silo 20B respectively. Further, the silo-side transport pipe 21 connected to the silo 20A may be referred to as "silo-side transport pipe 21A", and the silo-side transport pipe 21 connected to the silo 20B may be referred to as "silo-side transport pipe 21B".

[0021] Next, an operation method of the powder transport equipment 100 will be described. First, for example, powder to be stored in the silo 20A is charged into the powder supply equipment 10.

[0022] Next, by means of the first valve constituting the pipe switching unit 30, the supply-side transport pipe 11 is communicated with the silo-side transport pipe (transport destination silo-side transport pipe) 21A connected to the transport destination silo 20A, and the supply-side transport pipe 11 is blocked from communicating with the silo-side transport pipe (non-transport destination silo-side transport pipe) 21B connected to the non-transport destination silo 20B, which is a silo to which powder should not be transported. Further, the second valve 50 is set in an open state.

[0023] Next, powder is supplied from the powder supply equipment 10, and the powder is transported to the transport destination silo 20A via the supply-side transport pipe 11, the pipe switching unit 30 and the transport destination silo-side transport pipe 21A (powder transport step).

[0024] In this case, due to a malfunction such as wear of the first valve constituting the piping switching section 30, some of the powder may leak into the transport piping 21B on the non-transport destination silo side. Even in this case, since a powder detection device 40 is installed in the transport piping 21B on the non-transport destination silo side, the powder detection device 40 can detect the powder in the transport piping 21B on the non-transport destination silo side. If powder is actually detected by the powder detection device 40 in the transport piping 21B on the non-destination silo side, the inflow of powder into the transport piping 21B on the non-destination silo side is stopped based on this detection (inflow stop process). The inflow stop process can be carried out, for example, by stopping the supply of powder from the powder supply equipment 10 or by closing the second valve 50 installed in the transport piping 21B on the non-destination silo side. When the supply of powder from the powder supply equipment 10 is stopped, the amount of powder flowing into the transport piping 21B on the non-destination silo side can be reduced, thereby preventing the transport piping 21B from becoming blocked. On the other hand, when the second valve 50 installed in the transport piping 21B on the non-destination silo side is closed, the inflow of different types of powder into the non-destination silo 20B can be stopped immediately. For this reason, it is preferable to stop the supply of powder from the powder supply equipment 10 and at the same time close the second valve 50 installed in the transport piping 21B on the non-destination silo side.

[0025] In this way, the inflow of a different type of powder (different powder) from the powder to be transported to the non-destination silo 20B is suppressed, and if the non-destination silo 20B later becomes a destination silo, the cause of contamination by that different powder is suppressed. As a result, the powder transport equipment 100 can suppress the deterioration of powder quality in the destination silo 20A. After stopping the inflow of powder into the transport piping 21B on the non-transport destination silo side, the piping switching section 30 may be replaced, and then the supply of powder from the powder supply equipment 10 may be resumed.

[0026] Furthermore, after sufficient powder has been stored in silo 20A, the powder may be discharged from the powder supply equipment 10 and then transported to silo 20B as follows. In this case, silo 20B becomes a destination silo instead of a non-destination silo, and silo 20A becomes a non-destination silo instead of a destination silo.

[0027] In other words, first, the powder to be stored in the destination silo 20B is fed into the powder supply equipment 10. Next, the first valve constituting the piping switching section 30 connects the supply-side transport pipe 11 with the destination silo-side transport pipe 21B, while preventing the supply-side transport pipe 11 from connecting with the non-destination silo-side transport pipe 21A. Furthermore, the second valve 50 is assumed to be in the open position.

[0028] Next, powder is supplied from the powder supply equipment 10 and transported to the destination silo 20B via the supply-side transport piping 11, the piping switching section 30, and the destination silo-side transport piping 21B (powder transport process).

[0029] In this case, due to a malfunction such as wear of the first valve constituting the piping switching section 30, some of the powder may leak into the transport piping 21A on the non-transport destination silo side. Even in this case, since a powder detection device 40 is installed in the transport piping 21A on the non-transport destination silo side, the powder detection device 40 can detect the powder in the transport piping 21A on the non-transport destination silo side. If powder is actually detected by the powder detection device 40 in the transport piping 21A on the non-destination silo side, the inflow of powder into the transport piping 21A on the non-destination silo side is stopped based on this detection (inflow stop process). The inflow stop process can be carried out, for example, by stopping the supply of powder from the powder supply equipment 10 or by closing the second valve 50 installed in the transport piping 21A on the non-destination silo side. In this way, the inflow of foreign powders into the non-destination silo 20A is suppressed, and if the non-destination silo 20B later becomes the destination silo, the foreign powders are less likely to cause contamination. As a result, the powder transport equipment 100 can suppress the deterioration of powder quality in the destination silo 20B.

[0030] The powder transport equipment 100 will be described in detail below.

[0031] (powder) The powder is not particularly limited, and examples of powders include cement, pulverized coal, calcium carbonate, granulated carbon, and bentonite. For example, if the powder is cement, the powder stored in silo 20A may be NC (ordinary Portland cement), and the powder stored in silo 20B may be either BB (blast furnace cement) or HC (early-strength cement).

[0032] (Powder supply equipment) The powder supply equipment 10 is not particularly limited as long as it is capable of supplying powder. For example, such powder supply equipment 10 can be used, such as equipment that pumps powder by injecting high-pressure air. Examples of such equipment include cellar pumps and blow pots.

[0033] (Pipe switching section) The piping switching section can be any device that can switch between pipes; for example, a three-way valve or a two-way valve can be used.

[0034] (Silo-side transport piping) The powder transport equipment 100 may further include a branch pipe 22 that branches off from the silo-side transport pipe 21, and a third valve 23 into which the branch pipe 22 is installed, as shown in Figure 2, to the silo-side transport pipes 21A and 21B. Figure 2 is a schematic diagram showing the silo-side transport pipe 21 with the branch pipe 22 and the third valve 23 installed. If powder unintentionally flows into the non-destination silo side transport piping 21 connected to the non-destination silo 20, opening the third valve 23 installed in the branch pipe 22 will discharge the powder. On the other hand, if no powder has flowed into the non-destination silo side transport piping 21, opening the third valve 23 installed in the branch pipe 22 will not discharge the powder. Therefore, by installing the branch pipe 22 in the silo side transport piping 21, it is easy to confirm whether powder has unintentionally flowed into the non-destination silo side transport piping 21. Since branch pipe 22 is a pipe for checking for leaks of different types of powders, its diameter can be, for example, about 15 mm.

[0035] (Powder detection device) The powder detection device 40 is a device capable of detecting powder passing through the silo-side transport pipe 21, and consists of at least one of a flow meter and a thermometer. The flow meter is a device that measures changes in the flow rate of powder passing through the silo-side transport pipe 21, and can also detect the flow rate of air. The thermometer measures the temperature change of the silo-side transport pipe 21. Since powder tends to be at a high temperature, when powder passes through the silo-side transport pipe 21, the temperature of the powder raises the temperature of the silo-side transport pipe 21. Therefore, by measuring the temperature change of the silo-side transport pipe 21, it is possible to detect whether powder is passing through.

[0036] The powder detection device 40 may consist of only a flow meter or only a thermometer, but it is preferable to use both a flow meter and a thermometer. In this case, for example, even if the flow meter cannot detect the powder, the thermometer can detect it, or conversely, even if the thermometer cannot detect the powder, the flow meter can detect it, thus making it less likely that the powder will not be detected.

[0037] The flow meter is preferably an ultrasonic flow meter. In this case, even a small amount of powder passing through the silo-side transport piping 21 can be detected with high sensitivity. As a result, the transport of different types of powder to the non-transport destination silo 20 is more effectively suppressed. The flow meter is preferably a clamp-on type flow meter. Since a clamp-on type flow meter is installed on the outer surface of the transport piping on the silo side, it does not obstruct the flow of powder in the transport piping on the silo side.

[0038] The flow meter and thermometer are preferably located in the portion of the silo-side transport piping 21 that is directly connected to the piping switching section 30, and in a portion of the silo-side transport piping 21 that is no more than one-third of the length of the silo-side transport piping 21 (hereinafter also referred to as the "installation portion"). In this case, since the flow meter and thermometer are installed at a sufficient distance from the non-transport silo 20, it becomes difficult to detect the powder flowing from the non-transport silo 20 due to stagnation within the non-transport silo 20. Therefore, the powder being transported from the powder supply equipment 10 can be accurately detected. The length of the above-mentioned installation portion is preferably 1 / 5 or less, and more preferably 1 / 10 or less, of the length of the silo-side transport piping 21.

[0039] (Second valve) The second valve 50 is composed of an air flow control valve (damper) installed, for example, in the silo-side transport piping 21. The second valve 50 may be installed on the silo 20 side or on the piping switching section 30 side of the powder detection device 40, but it is preferable to install it on the silo 20 side. In this case, it is possible to suppress the flow of powder detected by the powder detection device 40 into the non-transport destination silo 20.

[0040] This disclosure is not limited to the embodiments described above. For example, in the embodiments described above, the powder transport equipment 100 has two silos 20 for storing different types of powder, but it may have three or more silos 20 for storing different types of powder. If the number of silos 20 is n, the piping switching unit 30 can be composed of, for example, n-1 or more valves and piping connecting these valves.

[0041] Furthermore, the powder transport equipment 100 may further include a spare silo for storing powder and spare silo-side transport piping connected to the spare silo, and the piping switching section 30 may be configured such that the first valve can switch the silo-side transport piping 21, which is connected to the supply-side transport piping 11, to the spare silo-side transport piping as well. In this case, if powder is detected by the powder detection device 40 in the transport piping on the non-transport destination silo side, the piping switching section 30 uses the first valve to switch the silo-side transport piping connected to the supply-side transport piping 11 to the spare silo-side transport piping, making it possible to transport different types of powder to the spare silo.

[0042] The summary of this disclosure is as follows: [1] A powder transport system comprising: a powder supply system for supplying powder; a plurality of silos for storing a plurality of different types of powder; a supply-side transport pipe connected to the powder supply system; a silo-side transport pipe connected to each of the plurality of silos; a pipe switching unit having a first valve capable of switching the silo-side transport pipe communicating with the supply-side transport pipe; and a powder detection device installed in the silo-side transport pipe for detecting powder in the silo-side transport pipe, wherein the powder detection device consists of at least one of a flow meter and a thermometer. [2] The powder transport equipment described in [1], further comprising a second valve installed in the transport piping on the silo side. [3] The powder transport equipment according to [1] or [2], further comprising a spare silo and spare silo-side transport piping connected to the spare silo, wherein the piping switching section is capable of switching the silo-side transport piping, which communicates with the supply-side transport piping, to the spare silo-side transport piping as well. [4] The powder transport equipment according to any one of [1] to [3], wherein the flow meter is an ultrasonic flow meter. [5] The powder transport equipment according to any one of [1] to [4], wherein the flow meter and the thermometer are located in the portion of the silo-side transport piping that is directly connected to the piping switching section and is installed in a portion of the silo-side transport piping that is 1 / 3 or less in length. [6] A powder transport facility according to any one of [1] to [5], comprising a branch pipe branching off from the silo-side transport piping and a third valve installed in the branch pipe. A method for operating a powder transport facility using the powder transport facility described in any of [7][1] to [6], comprising: a powder transport step of transporting the powder supplied from the powder supply facility to the destination silo among the plurality of silos via the supply transport facility, via the supply transport facility, via the supply transport facility, via the pipe switching unit, via the pipe switching unit, and via the silo transport piping, when powder is detected by the powder detection device in the non-destination silo transport piping, which is the silo transport piping not connected to the supply transport facility, and stopping the inflow of the powder into the non-destination silo, which is the silo connected to the non-destination silo transport piping, based on the detection. [8] The method of operating the powder transport equipment according to [7], wherein in the inflow stopping step, the inflow of the powder into the transport piping on the non-transport destination silo side is stopped by stopping the supply of the powder in the powder supply equipment. [9] The method for operating the powder transport equipment according to [7], wherein the powder transport equipment further comprises a second valve provided in the silo-side transport piping, and in the inflow stopping step, the transport of the powder to the non-transport destination silo-side transport piping is stopped by stopping the supply of the powder in the powder supply equipment and closing the second valve. [Explanation of Symbols]

[0043] 10...Powder supply equipment, 11...Supply side transport piping, 20, 20A, 20B...Silo, 21, 21A, 21B...Silo side transport piping, 22...Branch pipe, 23...Third valve, 30...Piping switching section, 40...Powder detection device, 50...Second valve, 100...Powder transport equipment.

Claims

1. A powder supply system that supplies powder, Multiple silos for storing multiple different types of powders, The supply-side transport piping connected to the aforementioned powder supply equipment, A silo-side transport piping connected to each of the aforementioned plurality of silos, A piping switching unit having a first valve capable of switching the silo-side transport piping that is in communication with the supply-side transport piping, A powder detection device is installed in the silo-side transport piping and detects powder in the silo-side transport piping. Equipped with, A powder transport facility in which the powder detection device comprises at least one of a flow meter and a thermometer.

2. The powder transport equipment according to claim 1, further comprising a second valve installed in the transport piping on the silo side.

3. Spare silo and The system further comprises a transport piping on the auxiliary silo side that is connected to the aforementioned auxiliary silo, The powder transport equipment according to claim 1, wherein the piping switching section is capable of switching the silo-side transport piping, which is connected to the supply-side transport piping, to the auxiliary silo-side transport piping as well.

4. The powder transport equipment according to claim 1, wherein the flow meter is an ultrasonic flow meter.

5. The powder transport equipment according to claim 1, wherein the flow meter and the thermometer are located in the portion of the silo-side transport piping that is directly connected to the piping switching section, and are installed in a portion of the silo-side transport piping that is 1 / 3 or less in length.

6. A branch pipe that branches off from the silo-side transport piping, The powder transport equipment according to claim 1, further comprising a third valve installed in the branch pipe.

7. A method for operating a powder transport facility using the powder transport facility described in claim 1, A powder transport process comprising: switching the silo-side transport piping, which is in communication with the supply-side transport piping, to the silo-side transport piping connected to the destination silo, which is the silo to which the powder is to be transported, using the first valve at the piping switching unit; and transporting the powder supplied from the powder supply equipment to the destination silo among the plurality of silos via the supply-side transport piping, the piping switching unit, and the silo-side transport piping; A method for operating powder transport equipment, comprising: an inflow stopping step, in which, based on the detection of powder by the powder detection device in the non-destination silo side transport pipe, which is the silo side transport pipe not connected to the supply side transport pipe, the inflow of the powder into the non-destination silo, which is the silo connected to the non-destination silo side transport pipe, is stopped.

8. The method for operating a powder transport equipment according to claim 7, wherein in the inflow stopping step, the inflow of the powder into the transport piping on the non-transport destination silo side is stopped by stopping the supply of the powder in the powder supply equipment.

9. The powder transport equipment further comprises a second valve provided in the silo-side transport piping, The method for operating a powder transport equipment according to claim 7, wherein in the inflow stopping step, the inflow of the powder into the transport piping on the non-transport destination silo side is stopped by stopping the supply of the powder in the powder supply equipment and closing the second valve.

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