Control device, powder supply system, control method and program

Abstract

To provide a control device allowed to supply a desired supply amount of particulate matter to a destination of transport.SOLUTION: A control device, in a particulate matter supply system including a tank that stores particulate matter, a transport line for carrying particulate matter flowing from the tank to a destination of transport, and a cut-out line that connects between the tank and the transport line and supplies the particulate matter flowing from the tank to the transport line, comprises density control means that controls the density of the particulate matter at a downstream of a confluence of the cut-out line and the transport line to a predetermined setting value and flow-rate control means that controls the flow rate of the particulate matter to be supplied to the destination of transport through the transport line to a command value the destination of transport instructs.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a control device, a powder / granular material supply system, a control method, and a program. [Background technology]

[0002] Patent Document 1 discloses a powder / granular material supplying system that mixes powdered reactants with an inert gas and sends the mixture to a metallurgical reaction vessel. FIG. 12 shows an example of a powder / granular material supplying system 100′. The powder / granular material supplying system 100′ includes an injection tank 2, a control device 20′, and the like, and transports and supplies powder / granular material to a destination facility 10. A pressure line 5 equipped with a pressure control device PIC4 and a pressure regulating valve V1 for feedback control of the internal pressure of the injection tank 2 is provided above the injection tank 2. Powder / granular material pulverized by a pulverizer (not shown) is supplied to the injection tank 2 through the pressure line 5. In the powder / granular material supplying system 100′, the powder / granular material is supplied to the injection tank 2 through the pressure line 5, and the powder / granular material accumulates in the injection tank 2.

[0003] Meanwhile, a high-pressure loss aerator 3 is attached to the bottom of the injection tank 2 in order to fluidize the powder and granular material inside. When aeration gas is supplied to the aerator 3 via an aeration line 6, the powder and granular material inside the injection tank 2 is fluidized, and the powder and granular material is fed (flowed out) to a feed line 9 due to the pressure difference between the injection tank 2 and a conveying line 7. In this way, the powder and granular material inside the injection tank 2 is fed to the conveying line 7 through the feed line 9, and is then supplied to a destination facility 10 by the conveying gas flowing through the conveying line 7.

[0004] A load detector 1, such as a load cell, is attached to the injection tank 2, and the load detector 1 measures the weight of the injection tank 2 containing powder and granular material. An aeration gas flow control valve V2 is provided in the aeration line 6, and the flow rate of the gas supplied through the aeration line 6 can be controlled by adjusting the aperture of the aeration gas flow control valve V2. A discharge flow control valve V3 is provided in the feed line 9, and the flow rate of the powder and granular material supplied to the feed line 9 can be controlled by adjusting the aperture of the discharge flow control valve V3. A flow velocity sensor C1 and a density sensor C2 are provided upstream of the discharge flow control valve V3 in the feed line 9, and these sensors measure the flow velocity and density of the powder and granular material being fed to the feed line 9. The weight of the powder and granular material being fed from the injection tank 2 to the feed line 9 can be detected from the weight measured by the load detector 1. The transfer line 7 is provided with a flow control device FIC8 and a carrier gas flow control valve V4 for feedback control of the flow rate of the carrier gas, and the flow rate of the carrier gas is controlled to a desired flow rate. A blower (not shown) or the like is used to supply the carrier gas. Because the operation of the blower requires power, such as electricity, reducing the amount of carrier gas and the flow rate contributes to improving efficiency. However, reducing the flow rate of the carrier gas causes the powder and granular material to settle to the bottom of the transfer line 7, which can cause the transfer line 7 to become clogged. Patent Document 1 states that the particle velocity of the powder and granular material must be at least approximately 5 m / s to ensure stable transport, i.e., to prevent blockages.

[0005] Patent Document 1 discloses a powder / granular material supply control method that determines in advance the particle velocity of the powder / granular material required to prevent clogging of the conveying line 7, determines the carrier gas flow rate based on the amount of powder / granular material to be delivered to the delivery line 9 based on the amount of carrier gas required to maintain this particle velocity, and controls the carrier gas flow control valve V4 to achieve this carrier gas flow rate. This control requires knowing the amount of powder / granular material being delivered, but the accuracy of the powder / granular material delivery flow rate (kg / s) depends on the time rate of change dm / dt of the weight m (kg) of the injection tank 2 containing the powder / granular material, as indicated by the load detector 1. (The accuracy of the delivery flow rate (kg / s) due to the function of the aerator 3 and other devices also affects the accuracy, but the accuracy of the delivery flow rate is not discussed in this disclosure.) Because the weight of the injection tank 2, which serves as the container for the powder / granular material, is large compared to the weight of the powder / granular material to be measured, it is difficult to accurately measure the weight of the powder / granular material using the load detector 1. The powder discharge flow rate (kg / s) can be expressed by the change in weight per second, but if the discharge rate per second is 1 kg / s, for example, the resolution of the load detector 1 must be about 0.1 kg. However, if the weight of the injection tank 2 is several tons, this is difficult to achieve with an inexpensive instrument.

[0006] To address this issue, the following control method has been proposed: P2 The flow rate (m / s) of the powder and granular material in the mixture of the gas flowing out of the injection tank 2, such as the aeration gas flow rate and the pressurized gas flow rate, and the density ρ2 (kg / m3) of the powder and granular material are measured by the flow rate sensor C1 and the density sensor C2, respectively, and the powder and granular material discharge flow rate g is calculated from the piping cross-sectional area A2 of the conveying line 7 using the following formula (1). P2 Calculate (kg / s). g P2 =A2 v P2 ρ2 (1) Then, the control device 20' adjusts the opening of the cut-off flow control valve V3 by proportional-integral control (PI control) to make the cut-off flow rate (kg / s) estimated by equation (1) coincide with the command value. For example, when the cut-off flow control valve V3 is closed, the downstream pressure to the injection tank 2 increases, so the cut-off flow rate g P2Conversely, when the cutoff flow control valve V3 is opened, the downstream pressure to the injection tank 2 decreases, so the cutoff flow rate g P2 (kg / s) increases. In this way, the cut-out flow rate g P2 (kg / s) is adjusted.

[0007] However, when the destination facility 10 is far from the injection tank 2, the above control method poses the following problem. For example, if the powder and granular material are transported with the carrier gas flow rate controlled at 5 m / s and the length of the transport piping from the junction of the delivery line 9 and the delivery line 7 to the destination facility 10 is 100 m, it takes 20 seconds for the powder and granular material to reach its destination. In other words, when the delivery flow control valve V3 is opened or closed, it takes 20 seconds for the powder and granular material flow rate to increase or decrease due to the opening or closing of the valve to reach its destination. If the powder and granular material supply facility 100' is used to supply combustible raw materials such as coal to a reactor, a 20-second delay is significant. The moisture content and composition of raw materials such as coal are not uniform and inevitably fluctuate over time. For this reason, the temperature and pressure of the reactor are adjusted by adjusting the raw material supply flow rate. A 20-second delay will cause the composition of chemical species in the reactor to fluctuate, resulting in environmental losses such as increased emissions of air pollutants such as nitrogen oxides, as well as economic losses such as fluctuations in combustion temperature, shortening the lifespan of the reactor.

[0008] To eliminate the delay in the powder reaching its destination, it is possible to increase or decrease the flow rate of the carrier gas rather than keeping it constant. The density of the powder part of the mixture consisting of the carrier gas and powder immediately after the confluence point P1 (the weight ratio of the powder to the mixture) is ρ3 (kg / m 3 ), the mass flow rate of the powder and granular material at the confluence g 3P is ρ3(kg / m 3 ) and the volumetric flow rate U (m 3 The volumetric flow rate U of the carrier line 7 is expressed as the product of the flow rate of the carrier gas flowing through the carrier line 7 in g G1 (kg / s), and the flow rate of gases such as aeration gas and pressurized gas flowing out of the injection tank 2 is g G2 (kg / s), and the density of the powder component is ρ P (kg / m3 ), and the density of the carrier gas components and the gas components flowing out of the injection tank 2 is ρ G (kg / m 3 ) is expressed by the following equation (2): P (kg / m3), and the density of the carrier gas component is ρ G (kg / m 3 ) can be treated as a fixed value determined by the type of powder or granular material and the operating state of the powder or granular material supplying equipment 100'.

[0009]

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[0010] Mass flow rate g of powder and granular material at confluence P1 3P (kg / s) is expressed as the product of density and volumetric flow rate by the following equation (3). g 3P (t)=ρ3(t)·U(t) (3) If the density of the powder and granular material at the confluence point P1 at time t is written as ρ3(t), it takes 20 seconds for it to reach the supply destination facility 10, so the powder and granular material density at the supply destination at time t can be approximated by the powder and granular material ρ3 at the confluence point at time t-20. In other words, the supply flow rate g of the powder and granular material to the transport destination at time t P4 (kg / s) can be approximately expressed by the following formula:

[0011]

number

[0012] It takes 20 seconds for the density of the powder and granular material at the confluence point P1 to propagate to the confluence point, but the volume flow rate U propagates without delay. Therefore, the supply flow rate g of the powder and granular material to the destination facility 10 at time t is P4 (t) is, for example, the carrier gas flow rate g at time t. G1 Since it is proportional to (t), if the opening of the carrier gas flow control valve V4 is changed, g P4 (t) can be adjusted without delay. The total flow rate of aeration gas and pressurized gas g G2The volumetric flow rate can also be changed by changing the carrier gas flow rate g G1 If the flow rate of the carrier gas is increased, the density of the powder ρ3 will decrease. G1 When the flow rate g (kg / s) is reduced, the volume ratio of the carrier gas at the confluence point P1 decreases and the density ρ3 of the powder increases. P4 (kg / s) is the carrier gas flow rate g G1 (kg / s) (or gas flow rate g G2 ) is a side effect that is regulated only by the carrier gas flow rate g G1 The figure shows how the density of powder and granular material varies in the conveying line 7 when a sinusoidal wave fluctuation of a fixed period is applied to the conveying gas flow rate g G1 (kg / s), as explained in equation (2), the powder supply flow rate g P4 However, the flow rate of the carrier gas g (kg / s) also increases without considering the amount of powder discharged. G1 As shown in Figure 13, if only the powder density ρ3 (kg / s) is changed, the powder density ρ3 (kg / s) will be varied on the conveying line 7. As shown in equation (4), the powder supply flow rate g P4 (kg / s) is also proportional to the change in powder density, so the flow rate of the carrier gas g G1 However, simply changing the flow rate of the powder or granular material will not allow the intended amount of powder or granular material to be supplied to the destination facility 10. In response to this, Patent Document 2 discloses a control method in which a density measuring device is provided to measure the density of the powder or granular material flowing through the transfer line 7, and the flow rate of the transfer gas is adjusted so that the measured density falls within a predetermined range.

[0013] In this way, in the prior art, the supply amount of powder or granular material is controlled by a function for controlling the flow rate of the carrier gas to a predetermined value and a function for controlling the powder or granular material flow rate (discharge flow rate) to a predetermined value. However, as explained above, particularly when the transfer line is long, the response of the actual powder or granular material flow rate to a change in the command value of the powder or granular material flow rate is delayed, or the powder or granular material cannot be supplied at the commanded flow rate due to variations in the density of the powder or granular material in the transfer line 7. [Prior art documents] [Patent documents]

[0014] [Patent Document 1] Japanese Patent Publication No. 62-215424 [Patent Document 2] Japanese Patent Application Publication No. 2020-179950 Summary of the Invention [Problem to be solved by the invention]

[0015] Even when the conveying line 7 is long, it is required to control the supply of powder and granular material at a commanded flow rate.

[0016] The present disclosure provides a control device, a powder / granular material supply system, a control method, and a program that can solve the above-mentioned problems. [Means for solving the problem]

[0017] The control device of the present disclosure includes a tank for storing powdered or granular material, a conveying line for conveying the powdered or granular material flowing out of the tank to a destination, and a discharge line connecting the tank and the conveying line and supplying the powdered or granular material flowing out of the tank to the conveying line. a transfer line flow control valve provided in the transfer line; and a discharge line flow control valve provided in the discharge line; a density control means for controlling the density of the powder or granular material downstream of a junction of the feed line and the conveying line to a predetermined set value, and a flow rate control means for controlling the flow rate of the powder or granular material supplied to the conveying destination through the conveying line to a command value specified by the conveying destination. The density control means controls the opening of the feed line flow control valve so that the measured density of the powder or granular material downstream of the confluence matches the set value, and the flow control means controls the opening of the feed line flow control valve so that the supply flow rate of the powder or granular material to the destination, estimated based on the sum of the feed gas flow rate through the conveying line upstream of the confluence and the gas flow rate flowing into the conveying line from the feed line, and the set value of the density, matches the command value.

[0018] The control method of the present disclosure also includes a tank for storing powder or granular material, a conveying line for conveying the powder or granular material flowing out of the tank to a destination, and a discharge line connecting the tank and the conveying line and supplying the powder or granular material flowing out of the tank to the conveying line. a transfer line flow control valve provided in the transfer line; and a discharge line flow control valve provided in the discharge line;In the powder / granular material supply system, the density of the powder / granular material downstream of the junction of the feed line and the conveying line is controlled to a predetermined set value. and The flow rate of the powder or granular material supplied to the destination through the conveying line is controlled to a command value indicated by the destination. In the step of controlling the density of the powder or granular material to a predetermined set value, the aperture of the feed line flow control valve is controlled so that the measured value of the density of the powder or granular material downstream of the confluence coincides with the set value, and in the step of controlling the flow rate of the powder or granular material to a command value indicated by the destination, the aperture of the feed line flow control valve is controlled so that the supply flow rate of the powder or granular material to the destination, estimated based on the sum of the flow rate of the carrier gas flowing through the conveyance line upstream of the confluence and the flow rate of the gas flowing into the conveyance line from the feed line, and the set value of the density, coincides with the command value.

[0019] The program of the present disclosure also includes a tank for storing powdered or granular material, a conveying line for conveying the powdered or granular material flowing out of the tank to a destination, and a discharge line for connecting the tank and the conveying line and supplying the powdered or granular material flowing out of the tank to the conveying line. a transfer line flow control valve provided in the transfer line; and a discharge line flow control valve provided in the discharge line; a computer that controls the powder / granular material supply system, the computer controlling the powder / granular material supply system, and the density of the powder / granular material downstream of the junction of the feed line and the conveying line is controlled to a predetermined set value. and The flow rate of the powder or granular material supplied to the destination through the conveying line is controlled to a command value indicated by the destination. and a step of controlling the density of the powder or granular material to a predetermined set value by controlling the aperture of the feed line flow control valve so that a measured value of the density of the powder or granular material downstream of the junction coincides with the set value, and controlling the flow rate of the powder or granular material to a command value indicated by the transfer destination by controlling the aperture of the transfer line flow control valve so that a supply flow rate of the powder or granular material to the transfer destination estimated based on a sum of a carrier gas flow rate flowing through the transfer line upstream of the junction and a gas flow rate flowing into the transfer line from the feed line, and the set value of the density, coincides with the command value. Execute the process. [Effects of the Invention]

[0020] According to the above-described control device, powder / granular material supply system, control method, and program, powder / granular material can be supplied to a destination at a commanded flow rate. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a diagram illustrating an example of a powder or granular material supply system according to a first embodiment. [Figure 2A] FIG. 4 is a flowchart showing an example of carrier gas flow rate control according to the first embodiment. [Figure 2B] FIG. 3 is a flow chart showing an example of powder density control according to the first embodiment. [Figure 3] FIG. 10 is a diagram illustrating an example of a powder / granular material supply system according to a second embodiment. [Figure 4A] FIG. 10 is a flowchart showing an example of gas flow rate control according to the second embodiment. [Figure 4B]FIG. 10 is a flow chart showing an example of powder density control according to the second embodiment. [Figure 5] FIG. 10 is a diagram showing an example of a powder / granular material supply system according to a third embodiment. [Figure 6] FIG. 10 is a diagram illustrating an example of a powder / granular material supply system according to a fourth embodiment. [Figure 7] FIG. 10 is a diagram showing an example of a powder / granular material supply system according to a fifth embodiment. [Figure 8A] FIG. 13 is a flowchart showing an example of carrier gas flow rate control according to the fifth embodiment. [Figure 8B] FIG. 13 is a flowchart showing an example of powder density control according to the fifth embodiment. [Figure 9] FIG. 13 is a diagram showing an example of a powder / granular material supply system according to a sixth embodiment. [Figure 10A] FIG. 13 is a flowchart showing an example of gas flow rate control according to the sixth embodiment. [Figure 10B] FIG. 13 is a flowchart showing an example of powder density control according to the sixth embodiment. [Figure 11] FIG. 13 is a diagram showing an example of a powder or granular material supply system according to a seventh embodiment. [Figure 12] FIG. 1 is a diagram showing an example of a general powder / granular material supplying facility. [Figure 13] FIG. 1 is a diagram illustrating the density distribution of powder and granular material that occurs on a conveying line. [Figure 14] FIG. 2 is a diagram illustrating an example of a hardware configuration of a control device according to each embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0022] First Embodiment (composition) FIG. 1 is a diagram showing an example of a powder or granular material supplying system according to the first embodiment. The powder and granular material supply system 100 includes an injection tank 2, a pressurized line 5 connected to the upper part of the injection tank 2, an aeration line 6 connected to an aerator 3, a feed line 9 connected to the lower part of the injection tank 2, a conveyance line 7, and a control device 20. The pressurized line 5 is provided with a pressure control device PIC4, a pressure adjustment valve V1, and a flow sensor C3. The aeration line 6 is provided with a flow sensor C4 and an aeration gas flow control valve V2. The conveyance line 7 is provided with a flow control device FIC8, a conveyance gas flow control valve V4, and a flow sensor C5, and a density sensor C6 is provided at the junction P1 with the feed line 9 (or downstream of P1). Each of the sensors C3 to C6 is connected to the control device 20.

[0023] The control device 20 includes a powder / granular material flow rate estimator 21, a powder / granular material flow rate controller 22, and a powder / granular material density controller 23 for the transfer line. The powder / granule flow rate estimator 21 estimates the powder / granule density command value ρ SV and the measured values ​​of the flow rate sensors C3 to C5 are acquired, and the supply flow rate of the powder or granular material to the destination facility 10 is estimated by the following equation (5).

[0024]

number

[0025] ρ SV is the set value (command value) of the powder density. G1 (t) is the measurement value of the flow sensor C5. G2 (t) is the sum of the measurement values ​​of the flow rate sensors C3 and C4. G and the density of the granular material ρ P The value of is a known value (a fixed value determined by the type of powder and the operating state of the powder supply device). G1 (t) 、 Total flow rate of aeration and pressurized gas g G2 If the value of (t) is known, the powder density ρ3 at the confluence point P1 and downstream side can be calculated by the expected value of the powder density ρSV Considering that the flow rate is maintained at g P2 The estimated value of (t) can be expressed by the following equation (6): Furthermore, from the above equation (5) and the following equation (6), the estimated value of the supply flow rate of the powder or granular material to the destination facility 10 at time t can be expressed by the following equation (7).

[0026]

number

[0027]

number

[0028] The destination powder / granular material flow rate estimator 21 estimates the supply flow rate of the powder / granular material to the destination facility 10 at time t using equation (7).

[0029] The powder / granular material flow rate controller 22 controls the flow rate of the carrier gas flowing through the transfer line 7. The flow rate of the powder / granular material at time t required by the transfer equipment 10 is set to r(t) (kg / s). For example, the powder / granular material flow rate controller 22 controls the flow rate of the powder / granular material at time t estimated by the transfer destination powder / granular material flow rate estimator 21, P4 (t), the command value r of the carrier gas flow rate at time t is G1 Alternatively, k may be calculated by proportional-integral control (PI control) as shown in the following equation (8): P is the proportional gain of the proportional-integral controller, T I is the symbol representing the integral time constant of the proportional-integral controller.

[0030]

number

[0031] The powder flow rate controller 22 calculates the command value r of the carrier gas flow rate calculated by the formula (8). G1 to the flow rate control device FIC8. This adjusts the opening of the carrier gas flow rate control valve V4, and the carrier gas flow rate based on the requested r(t) is realized.

[0032] The transfer line powder density controller 23 controls the feed flow rate of the powder to be supplied to the feed line 9. For example, the transfer line powder density controller 23 controls the opening command value r VLV2 (t) may be calculated by proportional-integral control (PI control) as shown in the following equation (9): P is the proportional gain, T I is a general symbol representing the integral time constant. In the proportional integral controller of the second embodiment and subsequent embodiments described later, k P and T I The proportional-integral controller uses the density ρ3 (kg / m) at the confluence measured by the density sensor C6. 3 ) is the set value ρ SV When the flow rate is insufficient, the opening of the cut-off flow control valve V3 is increased, and when the flow rate is exceeded, the opening of the cut-off flow control valve V3 is decreased. 3 ) is set to the value ρ SV Matches

[0033]

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[0034] By using the transfer line powder density controller 23, the powder density at the confluence point becomes constant even if the flow rate of the carrier gas is changed. For example, if the transfer line powder density controller 23 is given a command value ρ SV When this is set, the time average density of the powder and granular material at the confluence point P1 is ρ SV If the powder density at the confluence point P1 is constant even when the flow rate of the carrier gas is changed, the expected value of the powder density in the conveying line 7 downstream of the confluence point P1 is ρ SV Then, as mentioned above, the volumetric flow rate U of the carrier gas propagates without delay even 100 m away, so the powder density ρ SV If the set value ρ of the powder density can be controlled to a constant value, the actual powder flow rate supplied to the destination facility 10 can be controlled to a desired value without delay by controlling the flow rate of the carrier gas. SVInstead of this, the time average value of the powder density ρ3 at the confluence P1 may be used as the expected value. Alternatively, a value obtained by smoothing ρ3 using a high-pass filter such as a first-order lag filter may be used as the expected value. When the expected value of the powder density on the transfer line 7 is determined by either method, the powder supply flow rate to the transfer destination is expressed as in equation (5), and the powder supply flow rate g to the transfer destination facility 10 is p4 (kg / s) is the carrier gas flow rate g G1 (kg / s). This means that the carrier gas flow rate g G1 By adjusting the flow rate (kg / s) to the command value r, the flow rate of the powder or granular material supplied to the destination facility 10 can be controlled to the command value without delay or unevenness.

[0035] (operation) Next, the flow of powder / granular material supply control by the control device 20 will be described with reference to Figs. 2A and 2B. SV , the density of the carrier gas component ρ G , density of granular material ρ P The control device 20 stores the set values ​​of the flow rate sensors C3 to C5 and the density sensor C6. The control device 20 also acquires the latest flow rate command value r(t) requested by the destination facility 10. The control device 20 repeatedly executes the processes illustrated in FIGS. 2A and 2B in parallel at a predetermined control cycle.

[0036] The flow of carrier gas flow rate control is shown in FIG. 2A. FIG. 2A is a flow diagram showing an example of carrier gas flow rate control according to the first embodiment. The destination powder / granular material flow rate estimator 21 acquires measurements from the flow rate sensors C3 to C5 (step S1). Next, the destination powder / granular material flow rate estimator 21 estimates the supply flow rate of powder / granular material to the destination facility 10 using equation (7) (step S2). Next, the powder / granular material flow rate controller 22 calculates the carrier gas flow rate command value r(t) using the flow rate command value r(t) required by the destination facility and equation (8). G1 Calculate the command value r G1 to the flow rate control device FIC8, thereby controlling the flow rate of the carrier gas (step S3).

[0037] FIG. 2B shows a flow of control for maintaining a constant density of powder or granular material at the confluence point P1. FIG. 2B is a flow diagram showing an example of powder or granular material density control according to the first embodiment. The transfer line powder or granular material density controller 23 acquires a measurement value by the density sensor C6 (step S11). Next, the transfer line powder or granular material density controller 23 calculates an opening command value r of the delivery flow control valve V3 using equation (9). VLV2 The transfer line powder density controller 23 calculates the opening command value r VLV2 The opening of the discharge flow control valve V3 is controlled by the above, and the density ρ3 of the powder and granular material at the confluence point P1 is set to the set value ρ SV (Step S12).

[0038] According to this embodiment, in the powder / granular material supply system 100 that supplies powder / granular material from the injection tank 2 to the destination facility 10, the density of the powder / granular material inside the conveying line 7 is set to a set value ρ based on the density ρ3 indicated by the density sensor C6 that measures the density of the powder / granular material on the conveying line 7. SV The opening of the feed flow control valve V3 is adjusted so that the command value r of the gas flow rate in the transfer line 7 and the expected value (ρ SV ) and adjusts the opening of the carrier gas flow control valve V4 so that the carrier gas flow rate matches the command value r. This allows the powder or granular material to be supplied to the destination facility 10 at the commanded flow rate.

[0039] Second Embodiment A powder or granular material supply system 100A according to a second embodiment of the present invention will now be described with reference to FIGS. 3, 4A, and 4B. In the first embodiment, the aperture of the feed flow control valve V3 is controlled to control the density of the powder or granular material at the junction P1, and the aperture of the carrier gas flow control valve V4 is controlled to control the flow rate of the carrier gas. In contrast, in the second embodiment, the aperture of the aeration gas flow control valve V2 is controlled to control the density of the powder or granular material at the junction P1, and the aperture of the feed flow control valve V3 is controlled to control the flow rate of the carrier gas. Some powder or granular material supply facilities have a flow rate of the carrier gas passing through the carrier gas flow control valve V4 that is zero or close to zero, and the powder or granular material is transported to the destination facility 10 by the pressurized gas or aeration gas flowing out of the injection tank 2. The powder or granular material supply control according to the second embodiment is suitable for facilities with such characteristics.

[0040] (composition) FIG. 3 is a diagram showing an example of a powder or granular material supplying system according to the second embodiment. Among the components according to the second embodiment, the same components as those of the powdered or granular material supply system 100 according to the first embodiment are given the same reference numerals, and their respective descriptions will be omitted. In the second embodiment, as in the first embodiment, the powdered or granular material density at the junction P1 is controlled to be constant even when the flow rate of the carrier gas is changed. The difference from the first embodiment is that the density is controlled by changing the flow rate of the aeration gas flowing through the aeration line 6. Depending on the type of powder or granular material and the type of aerator 3, the aeration gas flow rate and pressurized gas flow rate may be greater than the carrier gas flow rate. In extreme cases, depending on the operating conditions such as output, the carrier gas flow rate may be zero. When the carrier gas flow rate is zero, the discharge flow rate g passing through the discharge flow rate control valve V3 P2 is the carrier gas flow rate g G1Since the powder and granule density ρ3 at the junction P1 is not diluted by the aeration gas, opening the discharge flow control valve V3 does not decrease the powder and granule density ρ3. In such cases, the ratio of gas to powder and granules flowing out of the injection tank 2 must be adjusted. The second embodiment provides a technology for achieving this. A common characteristic of powder and granules being discharged from the injection tank 2 is that increasing the aeration gas flow rate decreases the density of the powder and granules in the mixture of the discharged powder and granules. This is because an increase in the aeration flow rate increases the amount of gas near the outlet where the powder and granules are discharged from the injection tank 2, causing the powder and granules to become coarse. Therefore, if the powder and granule density ρ3 at the junction P1 is insufficient, further closing the aeration gas flow control valve V2 from its current opening to reduce the aeration gas will thicken the powder and granules in the mixture discharged from the injection tank 2, thereby compensating for the insufficient powder and granule density at the junction P1. Conversely, if the powder and granule density ρ3 at the junction P1 is excessive, further opening the aeration gas flow control valve V2 from its current opening will compensate for the excess density. In this way, the density of the powder and granular material at the confluence P1 can be made constant.

[0041] The powder or granular material supply system 100A according to the second embodiment includes a control device 20A instead of the control device 20 of the first embodiment, and the control device 20A includes a destination powder or granular material flow rate estimator 21, a powder or granular material flow rate controller 22A, and a transfer line powder or granular material density controller 23A. The destination powder or granular material flow rate estimator 21 is the same as that of the first embodiment.

[0042] The powder / granular material flow rate controller 22A controls the opening of the feed flow rate control valve V3. The powder / granular material flow rate required by the conveying facility 10 is represented by r(t) (kg / s). For example, the powder / granular material flow rate controller 22A controls the opening of the feed flow rate control valve V3. ... controller 22A controls the opening of the feed flow rate control valve V3. The powder / granular material flow rate controller 22A controls the opening of the feed flow rate control valve V3. The powder / granular material flow P4 (t), the command value r of the opening of the cut-out flow control valve V3 VLV2 Alternatively, k may be calculated by proportional-integral control (PI control) as shown in the following equation (10): P is the proportional gain, T I is the integral time constant.

[0043]

number

[0044] The powder flow rate controller 22A calculates the opening command value r at time t calculated by the formula (10). VLV2 The opening of the cut-off flow control valve V3 is controlled by r(t), thereby achieving the required gas flow rate based on r(t).

[0045] The transfer line powder density controller 23A controls the opening of the aeration gas flow control valve V2. For example, the transfer line powder density controller 23A controls the opening command value r of the aeration gas flow control valve V2 at time (t). VLVA (t) may be calculated by proportional-integral control (PI control) as shown in the following equation (11): P is the proportional gain, T I is the integral time constant. The proportional integral controller of equation (11) is configured to calculate the density ρ3 at the confluence measured by the density sensor C6 in inverse proportion to the set value ρ SV When the density ρ3 at the confluence point is insufficient, the opening of the aeration gas flow control valve V2 is reduced, and when the density ρ3 is exceeded, the opening of the aeration gas flow control valve V2 is increased. SV When the aeration gas flow rate is increased, the powder and granular material flowing out of the injection tank 2 is diluted, so that the powder and granular density ρ3 becomes equal to the set value ρ SV The proportional gain has a negative sign so that the aeration gas flow rate increases when the pressure is exceeded.

[0046]

number

[0047] (operation) The operation of the control device 20A according to the second embodiment will be described with reference to Figures 4A and 4B. The control device 20A repeatedly executes the processes illustrated in Figures 4A and 4B in parallel at a predetermined control cycle. The prerequisites are the same as those of the first embodiment.

[0048] The flow rate control of the gas flowing out from the injection tank 2 is shown in FIG. 4A. FIG. 4A is a flow diagram showing an example of gas flow rate control according to the second embodiment. The destination powder / granular material flow rate estimator 21 acquires the measured values ​​by the flow rate sensors C3 to C5 (step S1A). Next, the destination powder / granular material flow rate estimator 21 estimates the supply flow rate of the powder / granular material to the destination facility 10 using equation (7) (step S2A). Next, the powder / granular material flow rate controller 22A calculates the flow rate command value r(t) required by the destination facility and the opening command value r(t) using equation (10). VLV2 (t) is calculated, and the flow rate of the gas used to transport the powder or granular material (gas flowing out from the injection tank 2) is controlled by controlling the opening of the discharge flow control valve V3 (step S3A).

[0049] FIG. 4B shows a flow of control for maintaining a constant density of powder or granular material at the confluence point P1. FIG. 4B is a flow diagram showing an example of powder or granular material density control according to the second embodiment. The transfer line powder or granular material density controller 23A acquires a measurement value by the density sensor C6 (step S11A). Next, the transfer line powder or granular material density controller 23A calculates an opening command value r of the aeration gas flow control valve V2 using equation (11). VLVA The transfer line powder density controller 23A calculates the opening command value r VLVA The opening of the aeration gas flow control valve V2 is controlled to set the density ρ3 of the powder and granular material at the confluence point P1 to the set value ρ SV (step S12A).

[0050] According to this embodiment, in the powder / granular material supply system 100A that supplies powder / granular material from the injection tank 2 to the destination facility 10, the density of the powder / granular material inside the conveying line 7 is set to a set value ρ based on the density ρ3 indicated by the density sensor C6 that measures the density of the powder / granular material on the conveying line 7. SV The opening of the aeration gas flow control valve V2 is adjusted so that the command value r of the gas flow rate in the transfer line 7 and the expected value (ρ SV ) and adjusts the opening of the discharge flow control valve V3 so that the gas flow rate in the transfer line matches the command value r. This allows the powder or granular material to be supplied to the destination facility 10 at the commanded flow rate.

[0051] Third Embodiment A powder or granular material supply system 100B according to a third embodiment of the present invention will be described below with reference to Fig. 5. In the third embodiment, the flow rate g^ of the powder or granular material is calculated using the flow velocity of the carrier gas downstream of the junction P1. P4 Estimate.

[0052] (composition) FIG. 5 is a diagram showing an example of a powder or granular material supplying system according to the third embodiment. Among the components according to the third embodiment, the same components as those of the powder or granular material supply system 100 according to the first embodiment are designated by the same reference numerals, and their respective descriptions are omitted. In the third embodiment, as in the first embodiment, the powder or granular material density at the junction P1 is controlled to be constant even when the flow rate of the carrier gas is changed. The powder or granular material supply system 100B according to the third embodiment is provided with a flow rate sensor C7 downstream of the junction P1 that measures the flow rate of the carrier gas. The illustrated flow rate sensors C3 to C5 are not essential in the third embodiment. The powder or granular material supply system 100B according to the third embodiment is provided with a control device 20B instead of the control device 20 of the first embodiment, and the control device 20B is provided with a destination powder or granular material flow rate estimator 21B, a powder or granular material flow rate controller 22B, and a transfer line powder or granular material density controller 23B.

[0053] The powder / granule flow rate estimator 21B calculates the powder / granule supply flow rate g^ to the destination facility 10 using the following equation (12) and the powder / granule flow rate at the confluence P1 measured by the flow rate sensor C7. P4 (t) is estimated. The flow velocity of the powder and granular material at the confluence point P1 is v3 (m / s), and the cross-sectional area of ​​the conveying line 7 is A3 (m 2 ), the powder supply flow rate to the destination is expressed by the following equation (12).

[0054]

number

[0055] Compared to the first embodiment, the flow velocity of the powder or granular material on the conveying line 7 is directly measured, so the calculation is simpler and the calculation load can be reduced.

[0056] The powder / granular material flow rate controller 22B controls the flow rate of the carrier gas flowing through the transfer line 7. The flow rate of the powder / granular material required by the transfer equipment 10 is set to r(t) (kg / s). For example, the powder / granular material flow rate controller 22B uses the estimated value of the supply flow rate of the powder / granular material estimated by the transfer destination powder / granular material flow rate estimator 21B to set the command value r of the carrier gas flow rate. G1 Alternatively, k may be calculated by proportional-integral control (PI control) as shown in the following equation (13): P is the proportional gain, T I is the integral time constant.

[0057]

number

[0058] The transfer line powder density controller 23B controls the feed flow rate of the powder or granular material supplied to the feed line 9. For example, the transfer line powder density controller 23B controls the opening command value r VLV2 Alternatively, k may be calculated by proportional-integral control (PI control) as shown in the following equation (14): P is the proportional gain, T I is the general symbol for the integral time constant.

[0059]

number

[0060] (operation) Next, the flow of powder / granular material supply control by the control device 20B of the third embodiment will be described with reference to FIGS. 2A and 2B. The control device 20B repeatedly executes the processes illustrated in FIGS. 2A and 2B in parallel at a predetermined control cycle. The control device 20B controls the cross-sectional area of ​​the conveying line 7 to A3 (m 2 ) value is stored.

[0061] The flow of carrier gas flow rate control is shown in Figure 2B. The destination powder / granular material flow rate estimator 21B acquires the measurement value (velocity v3) measured by the flow rate sensor C7 (step S1). Next, the destination powder / granular material flow rate estimator 21B estimates the supply flow rate of powder / granular material to the destination facility 10 using equation (12) (step S2). Next, the powder / granular material flow rate controller 22B calculates the command value r(t) of the carrier gas flow rate at time t using equation (13) and the flow rate command value r(t) at time t required by the destination facility. G1 (t) is calculated and output to the flow rate control device FIC8, thereby controlling the flow rate of the carrier gas (step S3).

[0062] The flow of control for maintaining a constant density of the powder or granular material at the confluence point P1 is shown in FIG. 2B. The transfer line powder or granular material density controller 23B acquires a measurement value by the density sensor C6 (step S11). Next, the transfer line powder or granular material density controller 23B calculates the opening command value r of the feed flow control valve V3 at time t using equation (14). VLV2 The transfer line powder density controller 23B calculates the opening command value r VLV2 The opening of the discharge flow control valve V3 is controlled to make the density ρ3 of the powder and granular material at the confluence P1 equal to the set value ρ SV (step S12).

[0063] According to this embodiment, in the powder / granular material supply system 100B that supplies powder / granular material from the injection tank 2 to the destination facility 10, the density of the powder / granular material inside the conveying line is set to a set value ρ based on the density ρ3 indicated by the density sensor C6 that measures the density of the powder / granular material on the conveying line 7. SV While adjusting the opening of the discharge flow control valve V3 so that it coincides with the powder velocity in the conveying line 7 indicated by the flow velocity sensor C7 and the expected value of the powder density in the conveying line 7 (ρ SV ) and adjusts the opening of the carrier gas flow control valve V4 so that the carrier gas flow rate matches the command value r. This allows the powder or granular material to be supplied to the destination facility 10 at the commanded flow rate.

[0064] <Fourth embodiment> A powder or granular material supply system 100C according to a fourth embodiment of the present invention will be described below with reference to Fig. 6. In the fourth embodiment, in the configuration of the second embodiment, the flow rate g^ of the powder or granular material is calculated using the flow velocity of the carrier gas downstream of the junction P1, as in the third embodiment. P4 Estimate.

[0065] (composition) FIG. 6 is a diagram showing an example of a powder or granular material supplying system according to the fourth embodiment. Among the components of the fourth embodiment, the same components as those of the powder / granular material supply systems 100A and 100B of the second and third embodiments are designated by the same reference numerals, and their respective descriptions are omitted. The powder / granular material supply system 100C of the fourth embodiment includes a flow velocity sensor C7 downstream of the confluence P1 that measures the flow velocity of the carrier gas. In the fourth embodiment, the illustrated flow rate sensors C3 to C5 are not essential. The powder / granular material supply system 100C of the third embodiment includes a control device 20C instead of the control device 20A of the second embodiment. The control device 20C includes a destination powder / granular material flow rate estimator 21B, a powder / granular material flow rate controller 22C, and a transfer line powder / granular material density controller 23C. The destination powder / granular material flow rate estimator 21B is the same as that of the third embodiment. Compared to the destination powder / granular material flow rate estimator 21 of the second embodiment, calculations are simpler because the flow velocity of the powder / granular material in the transfer line 7 is directly measured.

[0066] The powder / granular material flow rate controller 22C controls the opening of the feed flow rate control valve V3. The powder / granular material flow rate required by the conveyance facility 10 is represented by r(t) (kg / s). For example, the powder / granular material flow rate controller 22C uses the estimated value of the supply flow rate of the powder / granular material estimated by the destination powder / granular material flow rate estimator 21B to determine the command value r(t) of the opening of the feed flow rate control valve V3 at time t. VLV2 (t) may be calculated by proportional-integral control (PI control) as shown in the following equation (15): P is the proportional gain, T I is the integral time constant.

[0067]

number

[0068] The transfer line powder density controller 23C controls the opening of the aeration gas flow control valve V2. For example, the transfer line powder density controller 23C controls the opening command value r of the aeration gas flow control valve V2 at time t. VLVA (t) may be calculated by proportional-integral control (PI control) as shown in the following equation (16): P is the proportional gain, T I is the general symbol for the integral time constant.

[0069]

number

[0070] (operation) Next, the flow of powder / granular material supply control by the control device 20C of the fourth embodiment will be described with reference to FIGS. 4A and 4B. The control device 20C repeatedly executes the processes illustrated in FIGS. 4A and 4B in parallel at a predetermined control cycle. The control device 20C controls the cross-sectional area of ​​the conveying line 7 to A3 (m 2 ) value is stored.

[0071] The flow rate control of the gas flowing out from the injection tank 2 is shown in Figure 4A. The destination powder / granular material flow rate estimator 21B acquires the measurement value (velocity V3) measured by the flow rate sensor C7 (step S1A). Next, the destination powder / granular material flow rate estimator 21B estimates the supply flow rate of the powder / granular material to the destination facility 10 using equation (12) (step S2A). Next, the powder / granular material flow rate controller 22C calculates the flow rate command value r(t) required by the destination facility and the opening command value r(t) using equation (15). VLV2 The flow rate of the gas used to transport the powder or granular material (gas flowing out of the injection tank 2) is controlled to a value based on the command value r(t) (step S3A).

[0072] The flow of control for maintaining a constant density of the powder or granular material at the confluence point P1 is shown in FIG. 4B. The transfer line powder or granular material density controller 23C acquires a measurement value by the density sensor C6 (step S11A). Next, the transfer line powder or granular material density controller 23C calculates an opening command value r of the aeration gas flow control valve V2 at time t using equation (16). VLVA The transfer line powder density controller 23C calculates the opening command value r VLVA (t) controls the opening of the aeration gas flow control valve V2, and the density ρ3 of the powder at the confluence P1 is set to the set value ρ SV (Step S12A).

[0073] According to this embodiment, in the powder / granular material supply system 100C that supplies powder / granular material from the injection tank 2 to the destination facility 10, the density of the powder / granular material inside the conveying line 7 is set to a set value ρ based on the density ρ3 indicated by the density sensor C6 that measures the density of the powder / granular material on the conveying line 7. SV While adjusting the aperture of the aeration gas flow control valve V2 so that the flow rate of the carrier gas matches the command value r, the aperture of the feed flow control valve V3 is adjusted based on the powder velocity in the transfer line 7 indicated by the flow velocity sensor C7 and the expected value of the powder density in the transfer line 7. This allows the powder to be supplied to the destination facility 10 at the commanded flow rate.

[0074] Fifth Embodiment A powder or granular material supply system 100D according to a fifth embodiment of the present invention will be described below with reference to Fig. 7. In the fifth embodiment, the flow rate g^ of the powder or granular material is calculated using the density and flow velocity of the powder or granular material flowing out of the injection tank 2. P4 Estimate (t).

[0075] (composition) FIG. 7 is a diagram showing an example of a powder or granular material supplying system according to the fifth embodiment. Among the components of the fifth embodiment, the same components as those of the powdered or granular material supply systems of the first and third embodiments are designated by the same reference numerals, and their description will be omitted. The powdered or granular material supply system 100D of the fifth embodiment is equipped with a flow velocity sensor C1 and a density sensor C2 downstream of the injection tank 2. Hereinafter, the value measured by the density sensor C2 is considered to be the density of the powdered or granular material. It is also considered that the gas and the powdered or granular material flow at the velocity measured by the flow velocity sensor C1. In the fifth embodiment, the illustrated flow rate sensors C3 and C4 are not essential. The powdered or granular material supply system 100D of the fifth embodiment is equipped with a control device 20D instead of the control device 20 of the first embodiment. The control device 20D is equipped with a destination powdered or granular material flow rate estimator 21D, a powdered or granular material flow rate controller 22D, a transfer line powdered or granular material density controller 23D, and a transfer line powdered or granular material density estimator 24D.

[0076] The transfer line powder density estimator 24D estimates the powder density ρ3 at the confluence point P1. The cross-sectional area of ​​the cut-out line 9 is A2 (m 2 ) and approximating that the gas and the powder flow at the same speed, the flow velocity of the powder in the cut-out line 9 measured by the flow sensor C1 is v2 (m / s), and the density of the powder measured by the density sensor C2 is ρ2 (kg / m 3 ) the flow rate of the powder or granular material at the feed line 9 at time t can be calculated by the following equation (17).

[0077]

number

[0078] Similarly, the gas flow rate of the cut-off line 9 at time t (the flow rate of the gas flowing out of the injection tank 2) is calculated by the flow velocity v2 (m / s) of the powder and granular material measured by the flow velocity sensor C1 and the set value ρ of the gas density. G Using this, it can be calculated using the following equation (18).

[0079]

number

[0080] The powder density estimator 24D for the transfer line calculates the powder flow rate and the gas flow rate in the feed line 9 using the measured values ​​by the sensors C1 and C2 and the formulas (17) and (18), and further calculates the flow rate g of the carrier gas measured by the flow sensor C5. G1 The density ρ^3(t) at the confluence point P1 is estimated using the following equation (19).

[0081]

number

[0082] Compared to the first and third embodiments, the powder density is measured at the cutting line 9 close to the injection tank 2, so fluctuations in powder density in response to changes in the opening of the aeration line 6 can be quickly detected, and the powder density ρ^3(t) can be accurately estimated.

[0083] The powder / granular material flow rate estimator 21D estimates the powder / granular material flow rate estimated by the powder / granular material density estimator 24D on the transfer line. P2 and the estimated gas flow rate g^ G2 The powder supply flow rate g^ to the destination facility 10 is calculated using the following equation (20): P4 Estimate (t).

[0084]

number

[0085] The powder / granular material flow rate controller 22D controls the flow rate of the carrier gas flowing through the transfer line 7. The flow rate of the powder / granular material required by the transfer facility 10 is assumed to be r(t) (kg / s). For example, the powder / granular material flow rate controller 22D controls the flow rate of the powder / granular material required by the transfer facility 10 based on the estimated value g^ of the powder / granular material supply flow rate estimated by the transfer destination powder / granular material flow rate estimator 21D. P4 (t), the command value r of the carrier gas flow rate at time t is G1 (t) may be calculated by proportional-integral control (PI control) as shown in the following equation (21): P is the proportional gain, T I is the integral time constant.

[0086]

number

[0087] The transfer line powder density controller 23D controls the feed flow rate of the powder or granular material supplied to the feed line 9. For example, the transfer line powder or granular material density controller 23D uses the powder or granular material density ρ^3(t) estimated by the transfer line powder or granular material density estimator 24D to calculate an opening command value r of the feed flow rate control valve V3 at time t. VLV2 (t) may be calculated by proportional-integral control (PI control) as shown in the following equation (22): P is the proportional gain, T I is the general symbol for the integral time constant.

[0088]

number

[0089] (operation) Next, the flow of powder / granular material supply control by the control device 20D of the fifth embodiment will be described with reference to FIGS. 8A and 8B. The control device 20D repeatedly executes the processes illustrated in FIGS. 8A and 8B in parallel at a predetermined control cycle. The control device 20D controls the cross-sectional area of ​​the cut-out line 9 to A2 (m 2 ) value is stored.

[0090] The flow of the carrier gas flow rate control is shown in Figure 8A. The transfer line powder density estimator 24D acquires the measured values ​​from the flow velocity sensor C1, the flow rate sensor C5, and the density sensor C2 (step S1D). Next, the transfer line powder density estimator 24D calculates the powder flow rate g^ in the feed line 9 using equations (17) and (18). P2 and gas flow rate g^ G2 is estimated (step S2D). Next, the powder flow rate estimator 21D calculates the powder supply flow rate g^ by using equation (20). P4 Next, the powder / granular material flow rate controller 22D estimates the command value r(t) of the carrier gas flow rate by using the flow rate command value r(t) required by the destination and equation (21).G1 (t) is calculated and output to the flow rate control device FIC8, thereby controlling the flow rate of the carrier gas (step S4).

[0091] The control flow for maintaining a constant density of the powder or granular material at the junction P1 is shown in Figure 8B. The transfer line powder or granular material density estimator 24D acquires the measured values ​​measured by the flow velocity sensor C1, the flow rate sensor C5, and the density sensor C2 (step S11D). Next, the transfer line powder or granular material density estimator 24D estimates the density of the powder or granular material at the junction P1 using equation (19) (step S12D). Next, the transfer line powder or granular material density controller 23D calculates the opening command value r of the delivery flow control valve V3 using equation (22). VLV2 The transfer line powder density controller 23D calculates the opening command value r VLV2 The opening of the discharge flow control valve V3 is controlled to make the density ρ3 of the powder and granular material at the confluence P1 equal to the set value ρ SV Control to.

[0092] According to this embodiment, in the powder / granular material supply system 100D that supplies powder / granular material from the injection tank 2 to the destination facility 10, the density of the powder / granular material inside the conveying line is set to a set value ρ based on the estimated value ρ^3 of the powder / granular material density that is estimated based on the powder / granular material density and the powder / granular material speed at the feed line 9. SV While adjusting the aperture of the feed flow control valve V3 so that the flow rate of the carrier gas matches the command value r, the aperture of the carrier gas flow control valve V4 is adjusted based on the powder density and powder velocity in the feed line 9 and the expected value of the powder density in the transfer line 7. This allows the powder to be supplied to the destination facility 10 at the commanded flow rate.

[0093] Sixth Embodiment A powder or granular material supply system 100E according to a sixth embodiment of the present invention will be described below with reference to Fig. 9. In the sixth embodiment, as in the fifth embodiment, the flow rate g^ of the powder or granular material is calculated using the density and flow velocity of the powder or granular material flowing out of the injection tank 2. P4 Estimate (t).

[0094] (composition) FIG. 9 is a diagram showing an example of a powder or granular material supplying system according to the sixth embodiment. Among the components of the sixth embodiment, the same components as those of the powdered or granular material supply systems of the second and fourth embodiments are designated by the same reference numerals, and their respective descriptions will be omitted. A powdered or granular material supply system 100E according to the sixth embodiment is equipped with a flow velocity sensor C1 that measures the flow velocity of the powdered or granular material and a density sensor C2 that measures the density of the powdered or granular material downstream of the injection tank 2. In the sixth embodiment, the illustrated flow rate sensors C3 and C4 are not essential. The powdered or granular material supply system 100E according to the sixth embodiment is equipped with a control device 20E instead of the control device 20 of the first embodiment, and the control device 20E is equipped with a destination powdered or granular material flow rate estimator 21D, a powdered or granular material flow rate controller 22E, a transfer line powdered or granular material density controller 23E, and a transfer line powdered or granular material density estimator 24D.

[0095] The destination powder / granular material flow rate estimator 21D and the transfer line powder / granular material density estimator 24D are the same as those in the fifth embodiment. Compared to the second and fourth embodiments, the powder / granular material density is measured in the delivery line 9 close to the injection tank 2, so that fluctuations in powder / granular material density in response to changes in the opening of the aeration line 6 can be detected quickly and the powder / granular material density ρ3 can be estimated with high accuracy.

[0096] The powder / granular material flow rate controller 22E controls the opening of the delivery flow rate control valve V3. The powder / granular material flow rate required by the conveying facility 10 is represented by r(t) (kg / s). For example, the powder / granular material flow rate controller 22E controls the opening of the delivery flow rate control valve V3. ... P4 (t), the command value r of the opening of the cut-out flow control valve V3 at time t VLV2 (t) may be calculated by proportional-integral control (PI control) as shown in the following equation (23): P is the proportional gain, T I is the integral time constant.

[0097]

number

[0098] The transfer line powder density controller 23E controls the opening of the aeration gas flow control valve V2. For example, the transfer line powder density controller 23E controls the opening command value r of the aeration gas flow control valve V2 at time t. VLVA (t) may be calculated by proportional-integral control (PI control) as shown in the following equation (24): P is the proportional gain, T I is the general symbol for the integral time constant.

[0099]

number

[0100] (operation) Next, the flow of powder / granular material supply control by the control device 20E of the sixth embodiment will be described with reference to Figs. 10A and 10B. The control device 20E repeatedly executes the processes illustrated in Figs. 10A and 10B in parallel at a predetermined control cycle. The control device 20E controls the cross-sectional area of ​​the cut-out line 9 to A2 (m 2 ) value is stored.

[0101] The flow of the carrier gas flow rate control is shown in Figure 10A. The transfer line powder density estimator 24D acquires the measured values ​​measured by the flow velocity sensor C1, the flow rate sensor C5, and the density sensor C2 (step S1E). Next, the transfer line powder density estimator 24D calculates the powder flow rate g^ in the feed line 9 using equations (17) and (18). P2 (t) and gas flow rate g^ G2 Next, the powder / granule flow rate estimator 21D estimates the powder / granule supply flow rate g^ by using equation (20) (step S2E). P4 Next, the powder flow rate controller 22E estimates the flow rate command value r(t) required by the destination and the opening command value r(t) using the formula (23) (step S3E). VLV2 (t) is calculated, and the flow rate of the gas flowing out of the injection tank 2 is controlled by controlling the opening of the cut-out flow control valve V3 (step S4E).

[0102] The flow of control for maintaining a constant density of the powder or granular material at the confluence point P1 is shown in Figure 10B. The transfer line powder or granular material density estimator 24D acquires the measured values ​​measured by the flow velocity sensor C1, the flow rate sensor C5, and the density sensor C2 (step S11E). Next, the transfer line powder or granular material density estimator 24D estimates the density of the powder or granular material at the confluence point P1 using equation (19) (step S12E). Next, the transfer line powder or granular material density controller 23E calculates the opening command value r of the aeration gas flow control valve V2 using equation (24). VLVA The transfer line powder density controller 23E calculates the opening command value r VLVA The opening of the aeration gas flow control valve V2 is controlled to set the density ρ3 of the powder and granular material at the confluence point P1 to the set value ρ SV (step S13E).

[0103] According to this embodiment, in the powder / granular material supply system 100D that supplies powder / granular material from the injection tank 2 to the destination facility 10, the density of the powder / granular material inside the conveying line is set to a set value ρ based on the estimated value ρ^3 of the powder / granular material density that is estimated based on the powder / granular material density and the powder / granular material speed at the feed line 9. SV While adjusting the aperture of the aeration gas flow control valve V2 so that the flow rate of the carrier gas matches the command value r, the aperture of the feed-out flow control valve V2 is adjusted based on the powder density and powder velocity in the feed-out line 9 and the expected value of the powder density in the transfer line 7. This allows the powder to be supplied to the destination facility 10 at the commanded flow rate.

[0104] Seventh Embodiment (composition) A powder or granular material supplying system 100F according to a seventh embodiment of the present invention will be described below with reference to FIG. 11 . The powder or granular material supplying system 100F according to the seventh embodiment includes a first supplying device 30 and a second supplying device 31 as powder or granular material supplying devices. The first supplying device 30 is, for example, a pulverizer that pulverizes lumps of powder or granular material to produce fine powder or granular material. The first supplying device 30 is connected to the transfer line 7 at a junction P2 upstream of the junction P1. The powder or granular material produced by the first supplying device 30 is supplied to the transfer line 7 at the junction P2 and transported to the destination facility 10 by a carrier gas (or gas discharged from the injection tank 2). The first supplying device 30 supplies the pulverized powder or granular material to the transfer line 7, but the amount of the pulverized powder or granular material is not constant, and the first supplying device 30 does not control the powder or granular material density or the carrier gas flow rate. The second supply device 31 includes the injection tank 2, one of the control devices 20 to 20E, the aeration gas flow control valve V2, the delivery flow control valve V3, the carrier gas flow control valve V4, etc., and, for example, while monitoring the powder density at the confluence point P1, determines whether the powder density at the confluence point P1 is ρ SV The second supply device 31 controls the opening of the delivery flow control valve V3 or the aeration gas flow control valve V2 so that the supply flow rate of the powder or granular material becomes the command value r(t). In addition, the second supply device 31 controls the carrier gas flow control valve V4 or the delivery flow control valve V3 so that the supply flow rate of the powder or granular material becomes the command value r(t). When controlling the delivery flow control valve V3 and the carrier gas flow control valve V4 in the second supply device 31, any of the control methods of the first, third, or fifth embodiment can be applied. When controlling the aeration gas flow control valve V2 and the delivery flow control valve V3 in the second supply device 31, any of the control methods of the second, fourth, or sixth embodiment can be applied.

[0105] FIG. 11 is a diagram illustrating an example of a powder or granular material supply system according to a seventh embodiment. FIG. 11 illustrates a configuration in which the powder or granular material supply system 100 of the first embodiment is applied to the second supply device 31 of the powder or granular material supply system 100F. In the configuration illustrated in FIG. 11, the powder or granular material density on the transfer line 7 is directly measured by the density sensor C6. This allows powder or granular material to be supplied simultaneously from multiple powder or granular material supply devices. In the first to sixth embodiments, a single powder or granular material supply device is used, and the powder or granular material density on the transfer line 7 can be determined by the discharge flow rate from the injection tank 2. In contrast, the powder or granular material supply system 100F according to the seventh embodiment is expanded to transport powder or granular material supplied from multiple powder or granular material supply devices 30, 31 to the destination facility 10. If a series configuration is adopted in which the powder or granular material produced by the first supply device 30 is temporarily stored in the injection tank 2 and then transported to the destination facility 10, the injection tank 2 would require a large capacity. In contrast, if the powder and granular material is transported directly from the first supply device 30 to the destination, and the time-dependent fluctuations in the powder and granular material produced by the first supply device 30 are compensated for by the second supply device 31, the capacity of the injection tank 2 can be made smaller, which is economical.

[0106] (operation) The first supply device 30 generates powder and supplies the generated powder to the transfer line 7. In the second supply device 31, the control device 20 performs the process illustrated in FIGS. 2A and 2B. That is, the control device 20 calculates an opening command value r of the discharge flow control valve V3 by using the formula (9) based on the powder density ρ3 at time t measured by the density sensor C6. VLV2 is calculated, and the density ρ3 of the powder and granular material at the confluence point P1 is set to the set value ρ SV The control device 20 controls the feed flow control valve V3 so that the powder / granular material supply flow rate g^ at time t is calculated based on the measured values ​​of the flow sensors C3 to C5 and equation (7). P4 Furthermore, the control device 20 estimates the carrier gas flow command value r(t) using the flow command value r(t) and equation (8). G1 is calculated and the flow rate of the carrier gas flowing through the carrier line 7 is controlled.

[0107] According to this embodiment, in addition to the effects of the first embodiment, it is possible to improve efficiency by reducing the capacity of the injection tank 2 and suppressing the energy required to store the powder and granular material produced by the pulverizer in the injection tank 2. Although Fig. 11 shows a configuration in which only one first supply device 30 is provided, it is also possible to provide a plurality of first supply devices 30 and supply the powder and granular material produced by each first supply device 30 to the conveying line 7 upstream of the junction P1.

[0108] FIG. 14 is a diagram illustrating an example of a hardware configuration of a control device according to each embodiment. The computer 900 includes a CPU 901 , a main memory device 902 , an auxiliary memory device 903 , an input / output interface 904 , and a communication interface 905 . The above-described control devices 20 to 20E are implemented in a computer 900. The above-described functions are stored in the auxiliary storage device 903 in the form of a program. The CPU 901 reads the program from the auxiliary storage device 903, loads it into the main storage device 902, and executes the above-described processing in accordance with the program. The CPU 901 also allocates a storage area in the main storage device 902 in accordance with the program. The CPU 901 also allocates a storage area in the auxiliary storage device 903 for storing data being processed in accordance with the program.

[0109] Alternatively, a program for implementing all or part of the functions of the control devices 20-20E may be recorded on a computer-readable recording medium, and the program may be loaded into a computer system and executed to perform processing by each functional unit. The term "computer system" as used herein includes hardware such as an OS and peripheral devices. Furthermore, if a WWW system is used, the term "computer system" also includes a homepage provision environment (or display environment). Furthermore, the term "computer-readable recording medium" refers to portable media such as CDs, DVDs, and USBs, as well as storage devices such as hard disks built into the computer system. Furthermore, if the program is distributed to the computer 900 via a communication line, the computer 900 that receives the program may load the program into the main storage device 902 and execute the above-described processing. Furthermore, the program may be for implementing part of the above-described functions, or may be capable of implementing the above-described functions in combination with a program already stored in the computer system.

[0110] As described above, several embodiments according to the present disclosure have been described, but all of these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope of the invention and its equivalents as defined in the claims, as well as in the scope and spirit of the invention.

[0111] <Additional Notes> The control devices 20 to 20E, powdery material supply systems 100 to 100F, control methods and programs described in the respective embodiments can be understood, for example, as follows.

[0112] (1) A control device 20 to 20E according to a first aspect of the present invention is a powder / granular material supply system 100 to 100F including a tank 2 for storing powder / granular material, a transfer line 7 for transferring the powder / granular material flowing out of the tank 2 to a destination, and a feed line 9 connecting the tank 2 and the transfer line 7 and supplying the powder / granular material flowing out of the tank 2 to the transfer line 7, and controls the density of the powder / granular material downstream of a junction P1 of the feed line 9 and the transfer line 7 to be equal to or lower than a predetermined set value ρ SV and a flow rate control means (powder / granular flow rate controllers 22 to 22E) that controls the flow rate of the powder / granular material supplied to the destination 10 through the conveyance line 7 to a command value r(t) instructed by the destination. This allows the powder or granular material to be supplied to the destination facility 10 at a flow rate as instructed (first to seventh embodiments).

[0113] (2) A control device 20 according to a second aspect is the control device 20 of (1), wherein the powder / granular material supply system 100 further includes a transfer line flow control valve V4 provided in the transfer line 7 and a feed-out line flow control valve V3 provided in the feed-out line 9, and the density control means (transfer line powder / granular material density controller 23) controls the powder / granular material density downstream of the confluence P1 to be equal to or greater than the set value ρ SV The opening of the feed line flow control valve V3 is controlled (Equation (9)) so that the flow rate of the carrier gas flowing through the carrier line at the upstream side of the confluence P1 (measured by the sensor C5) matches the flow rate of the carrier gas flowing through the carrier line at the upstream side of the confluence P1. G1 ) and the gas flow rate flowing from the cut-out line to the transfer line (gas flow rate measured by sensor C3 + gas flow rate measured by sensor C4 = g G2 ) and the set value of the density ρ SV and the supply flow rate (g^ of the powder or granular material to the destination estimated based on P4 The opening of the transfer line flow control valve V4 is controlled so that the command value r(t) matches the command value r(t). The powder flow rate is controlled to the command value r(t) by controlling the opening of the transfer line flow control valve V4, and the powder density is controlled to the set value ρ by controlling the opening of the delivery line flow control valve V3 based on the measured powder density value ρ3. SV By controlling the flow rate in this way, the powder or granular material can be supplied to the destination facility 10 at a flow rate as instructed (first embodiment).

[0114] (3) A control device 20A according to a third aspect is the control device 20A of (1), wherein the powdered or granular material supply system 100A further includes an aeration line 6 connected to a lower portion of the tank 2 and feeding gas for fluidizing the powdered or granular material stored in the tank 2 into the tank, an aeration gas flow control valve V2 provided in the aeration line 6, and a feed-out line flow control valve V3 provided in the feed-out line 9, and the density control means (transport line powdered or granular material density controller 23A) controls the density of the powdered or granular material downstream of the confluence P1 to be equal to or greater than the set value ρ SV The flow control means (powder / granular material flow rate controller 22A) controls the aperture of the aeration gas flow control valve V2 so that the powder / granular material supply flow rate to the destination of the powder / granular material, estimated based on the sum of the carrier gas flow rate flowing through the carrier line upstream of the confluence P1 and the gas flow rate flowing into the carrier line from the delivery line, and the set value of the density, matches the command value. The powder flow rate is controlled to the command value r(t) by controlling the opening of the discharge line flow control valve V3, and the powder density is controlled to the set value ρ by controlling the opening of the aeration gas flow control valve V2 based on the measured powder density value ρ3. SV By controlling the flow rate in this way, the powder or granular material can be supplied to the destination facility 10 at a flow rate as instructed (second embodiment).

[0115] (4) The control device 20B according to the fourth aspect is the control device 20B of (1), The powder / granular material supply system 100B further includes a transfer line flow control valve V4 provided in the transfer line 7 and a feed-out line flow control valve V3 provided in the feed-out line 9, and the density control means (transfer line powder / granular material density controller 23B) controls the powder / granular material density controller 23B to determine whether a measured value ρ3 of the density of the powder / granular material downstream of the confluence P1 is equal to or greater than the set value ρ SV The flow rate control means (powder flow rate controller 22B) controls the opening of the feed line flow rate control valve V3 so that the opening of the feed line flow rate control valve V3 coincides with the measured value of the flow rate of the carrier gas flowing downstream of the junction P1 in the transfer line 7 (V3 measured by the sensor C7) and the set value ρ of the density. SV The opening of the transfer line flow control valve V4 is controlled so that the supply flow rate of the powder to the transfer destination, estimated based on the above, coincides with the command value. The transfer line flow control valve V4 is controlled so that the powder flow rate based on the flow rate of the carrier gas measured by the sensor C7 becomes the command value r(t), and the powder density is set to the set value ρ by controlling the opening of the delivery line flow control valve V3. SV By controlling the flow rate in this way, the powder or granular material can be supplied to the destination facility 10 at a flow rate as instructed (third embodiment).

[0116] (5) A control device 20C according to a fifth aspect is the control device 20C of (1), wherein the powdered or granular material supply system 100C further includes an aeration line 6 connected to the lower portion 3 of the tank 2 and feeding gas for fluidizing the powdered or granular material stored in the tank 2 into the tank, an aeration gas flow control valve V2 provided in the aeration line 6, and a feed-out line flow control valve V3 provided in the feed-out line 9, and the density control means (transport line powdered or granular material density controller 23C) controls the density of the powdered or granular material downstream of the confluence P1 to be equal to or greater than the set value ρ SV The flow rate control means (powder / granular material flow rate controller 22C) controls the opening of the aeration gas flow rate control valve V2 so that the opening of the aeration gas flow rate control valve V2 matches the measured value (v3) of the carrier gas flowing downstream of the junction P1 in the transfer line 7 and the set value ρ SVThe opening of the feed line flow control valve V3 is controlled so that the supply flow rate of the powder or granular material to the destination, estimated based on the above, coincides with the command value. The flow control valve V3 of the cut-off line is controlled so that the powder flow rate based on the flow velocity of the carrier gas measured by the sensor C7 becomes the command value r(t), and the opening of the aeration gas flow control valve V2 is controlled to set the powder density to the set value ρ SV By controlling the flow rate as instructed, the powder or granular material can be supplied to the destination facility 10 at the flow rate as instructed (fourth embodiment).

[0117] (6) A control device 20D according to a sixth aspect is the control device 20D of (1), wherein the powder / granular material supply system 100D further includes a transfer line flow control valve V4 provided in the transfer line 7 and a feed-out line flow control valve V3 provided in the feed-out line 9, and the density control means (transfer line powder / granular material density controller 23D) is a pre-calculated powder / granular material density controller calculated based on the flow rate of the powder / granular material flowing through the feed-out line, the gas flow rate flowing through the feed-out line, and the carrier gas flow rate flowing through the transfer line upstream of the junction. The opening of the discharge line flow control valve is controlled so that the estimated value of the density of the powder or granular material downstream of the confluence matches the set value, and the flow control means (powder or granular material flow controller 22D) controls the opening of the conveying line flow control valve so that the supply flow rate of the powder or granular material to the conveying destination estimated based on the flow rate of the powder or granular material flowing through the discharge line, the gas flow rate flowing through the discharge line, the conveying gas flow rate flowing through the conveying line upstream of the confluence, and the set value of the density matches the command value. The powder density downstream of the confluence P1 is estimated. This allows the powder to be supplied to the destination facility 10 at a commanded flow rate by controlling the opening of the transfer line flow control valve V4 and the discharge line flow control valve V3 without providing a density sensor C6 (fifth embodiment).

[0118] (7) A control device 20E according to a seventh aspect is the control device 20E of (1), wherein the powdered or granular material supply system 100E further includes an aeration line connected to a lower portion of the tank and feeding gas into the tank for fluidizing the powdered or granular material stored in the tank, an aeration gas flow control valve provided in the aeration line, and a feed-out line flow control valve provided in the feed-out line, and the density control means controls the flow rate of the powdered or granular material flowing through the feed-out line, the gas flow rate through the feed-out line, and a flow rate control valve provided in the feed-out line upstream of the confluence. The flow control means controls the opening of the aeration gas flow control valve so that an estimated value of the density of the powder or granular material downstream of the confluence, calculated based on the flow rate of the carrier gas flowing through the conveying line, matches the set value, and the flow control means controls the opening of the extrusion line flow control valve so that the supply flow rate of the powder or granular material to the destination, estimated based on the flow rate of the powder or granular material flowing through the extrusion line, the gas flow rate flowing through the extrusion line, the carrier gas flow rate flowing through the conveying line upstream of the confluence, and the set value of the density, matches the command value. The powder density downstream of the confluence P1 is estimated. This allows the powder to be supplied at a flow rate commanded by the destination facility 10 by controlling the opening of the delivery line flow control valve V3 and the aeration gas flow control valve V2, without providing a density sensor C6 (sixth embodiment).

[0119] (8) The powdered or granular material supply system 100 to 100F according to the eighth aspect includes a tank 2 for storing powdered or granular material, a conveying line 7 for conveying the powdered or granular material flowing out of the tank 2 to a destination, a discharge line 9 connecting the tank 2 to the conveying line 7 and supplying the powdered or granular material flowing out of the tank 2 to the conveying line 7, and a control device 20 to 20E described in any one of (1) to (7). According to the powder or granular material supply systems 100 to 100F, powder or granular material can be supplied at a flow rate instructed by the destination facility 10 (first to seventh embodiments).

[0120] (9) A powdered or granular material supplying system 100F according to a ninth aspect is the powdered or granular material supplying system 100F of (8), further including a supplying device 30 that supplies the powdered or granular material to the conveying line 7 upstream of the junction P1. This eliminates the need to temporarily store all of the powder to be supplied to the destination facility 10 in the injection tank 2.

[0121] (10) In a control method according to the tenth aspect, in a powder / granular material supply system including a tank for storing powder / granular material, a conveying line for conveying the powder / granular material flowing out of the tank to a destination, and an extrusion line connecting the tank and the conveying line and supplying the powder / granular material flowing out of the tank to the conveying line, the density of the powder / granular material downstream of the junction of the extrusion line and the conveying line is controlled to a predetermined set value, and the flow rate of the powder / granular material supplied to the destination through the conveying line is controlled to a command value specified by the destination.

[0122] (11) A program according to an eleventh aspect causes a computer that controls a powder or granular material supply system that includes a tank for storing powder or granular material, a conveying line for conveying the powder or granular material flowing out of the tank to a destination, and an extrusion line that connects the tank and the conveying line and supplies the powder or granular material flowing out of the tank to the conveying line to execute a process of controlling the density of the powder or granular material downstream of the junction of the extrusion line and the conveying line to a predetermined set value, and controlling the flow rate of the powder or granular material supplied to the destination through the conveying line to a command value specified by the destination. [Explanation of symbols]

[0123] 100-100E···Powder and granular material supply system, 20-20E···Control device, 21-21D···Powder and granular material flow rate estimator at transfer destination, 22-22E···Powder and granular material flow rate controller, 23-23E···Powder and granular material density controller for transfer line, 24D-24E···Powder and granular material density estimator for transfer line, 900···Computer, 901···CPU, 902···Main storage device, 903···Auxiliary storage device, 904···Input / output interface, 905···Communication interface

Claims

1. A powdered or granular material supply system comprising: a tank for storing powdered or granular material; a conveying line for conveying the powdered or granular material flowing out of the tank to a destination; a discharge line for connecting the tank and the conveying line and supplying the powdered or granular material flowing out of the tank to the conveying line; a conveying line flow control valve provided on the conveying line; and a discharge line flow control valve provided on the discharge line, a density control means for controlling the density of the powder or granular material downstream of a junction of the feed line and the conveying line to a predetermined set value; a flow rate control means for controlling the flow rate of the powder or granular material supplied to the destination through the conveying line to a command value instructed by the destination; Equipped with the density control means controls the aperture of the discharge line flow control valve so that a measured value of the density of the powder or granular material downstream of the confluence coincides with the set value; the flow rate control means controls the aperture of the transfer line flow rate control valve so that the supply flow rate of the powder or granular material to the transfer destination, estimated based on the sum of the flow rate of the transfer gas flowing through the transfer line upstream of the confluence and the flow rate of the gas flowing into the transfer line from the delivery line, and the set value of the density, coincides with the command value. Control device.

2. a supply line for supplying the powder or granular material flowing out of the tank to a destination; a discharge line connecting the tank to the discharge line and supplying the powder or granular material flowing out of the tank to the discharge line; an aeration line connected to a lower portion of the tank and supplying gas to the tank for fluidizing the powder or granular material stored in the tank; an aeration gas flow control valve provided in the aeration line; and a discharge line flow control valve provided in the discharge line, a density control means for controlling the density of the powder or granular material downstream of a junction of the feed line and the conveying line to a predetermined set value; a flow rate control means for controlling the flow rate of the powder or granular material supplied to the destination through the conveying line to a command value instructed by the destination; Equipped with the density control means controls the aperture of the aeration gas flow control valve so that a measured value of the density of the powder or granular material downstream of the confluence coincides with the set value; the flow rate control means controls the opening of the feed-out line flow rate control valve so that the supply flow rate of the powder or granular material to the destination, estimated based on the sum of the carrier gas flow rate flowing through the carrier line upstream of the junction and the gas flow rate flowing into the carrier line from the feed-out line, and the set value of the density, matches the command value. Control device.

3. a supply line for supplying the powder or granular material flowing out of the tank to a destination; a discharge line connecting the tank to the discharge line and supplying the powder or granular material flowing out of the tank to the discharge line; an aeration line connected to a lower portion of the tank and supplying gas to the tank for fluidizing the powder or granular material stored in the tank; an aeration gas flow control valve provided in the aeration line; and a discharge line flow control valve provided in the discharge line, a density control means for controlling the density of the powder or granular material downstream of a junction of the feed line and the conveying line to a predetermined set value; a flow rate control means for controlling the flow rate of the powder or granular material supplied to the destination through the conveying line to a command value instructed by the destination; Equipped with the density control means controls the aperture of the aeration gas flow control valve so that a measured value of the density of the powder or granular material downstream of the confluence coincides with the set value; the flow rate control means controls the aperture of the feed line flow rate control valve so that the supply flow rate of the powder or granular material to the destination, estimated based on a measured value of the flow rate of the carrier gas flowing downstream of the junction in the carrier line and the set value of the density, coincides with the command value. Control device.

4. A powdered or granular material supply system comprising: a tank for storing powdered or granular material; a conveying line for conveying the powdered or granular material flowing out of the tank to a destination; a discharge line for connecting the tank and the conveying line and supplying the powdered or granular material flowing out of the tank to the conveying line; a conveying line flow control valve provided on the conveying line; and a discharge line flow control valve provided on the discharge line, a density control means for controlling the density of the powder or granular material downstream of a junction of the feed line and the conveying line to a predetermined set value; a flow rate control means for controlling the flow rate of the powder or granular material supplied to the destination through the conveying line to a command value instructed by the destination; Equipped with the density control means controls the aperture of the feed-out line flow control valve so that an estimated value of the density of the powder or granule downstream of the junction, which is calculated based on the flow rate of the powder or granule flowing through the feed-out line, the flow rate of the gas flowing through the feed-out line, and the flow rate of the carrier gas flowing through the carrier line upstream of the junction, coincides with the set value; the flow rate control means controls the aperture of the transfer line flow rate control valve so that the supply flow rate of the powder or granular material to the transfer destination, estimated based on the flow rate of the powder or granular material flowing through the feed line, the flow rate of the gas flowing through the feed line, the flow rate of the carrier gas flowing through the transfer line upstream of the junction, and the set value of the density, coincides with the command value. Control device.

5. a supply line for supplying the powder or granular material flowing out of the tank to a destination; a discharge line connecting the tank to the discharge line and supplying the powder or granular material flowing out of the tank to the discharge line; an aeration line connected to a lower portion of the tank and supplying gas to the tank for fluidizing the powder or granular material stored in the tank; an aeration gas flow control valve provided in the aeration line; and a discharge line flow control valve provided in the discharge line, a density control means for controlling the density of the powder or granular material downstream of a junction of the feed line and the conveying line to a predetermined set value; a flow rate control means for controlling the flow rate of the powder or granular material supplied to the destination through the conveying line to a command value instructed by the destination; Equipped with the density control means controls the aperture of the aeration gas flow control valve so that an estimated value of the density of the powder or granular material downstream of the junction, which is calculated based on the flow rate of the powder or granular material flowing through the feed line, the flow rate of the gas flowing through the feed line, and the flow rate of the carrier gas flowing through the carrier line upstream of the junction, coincides with the set value; the flow rate control means controls the aperture of the feed-out line flow rate control valve so that the supply flow rate of the powder or granular material to the transport destination, estimated based on the flow rate of the powder or granular material flowing through the feed-out line, the flow rate of the gas flowing through the feed-out line, the flow rate of the carrier gas flowing through the transport line upstream of the junction, and the set value of the density, coincides with the command value. Control device.

6. a tank for storing powder or granular material; a conveying line for conveying the powder or granular material flowing out of the tank to a destination; and a discharge line for connecting the tank and the conveying line and supplying the powder or granular material flowing out of the tank to the conveying line. The control device according to any one of claims 1 to 5; A powder and granular material supply system comprising:

7. a supply device that supplies the powder or granular material to the conveying line upstream of the junction point; The powder / granular material supply system according to claim 6, further comprising:

8. A powdered or granular material supply system comprising: a tank for storing powdered or granular material; a conveying line for conveying the powdered or granular material flowing out of the tank to a destination; a discharge line for connecting the tank and the conveying line and supplying the powdered or granular material flowing out of the tank to the conveying line; a conveying line flow control valve provided on the conveying line; and a discharge line flow control valve provided on the discharge line, controlling the density of the powder or granular material downstream of a junction of the feed line and the conveying line to a predetermined set value; a step of controlling a flow rate of the powder or granular material supplied to the destination through the conveying line to a command value instructed by the destination; and In the step of controlling the density of the powder or granular material to a predetermined set value, an opening degree of the feed line flow control valve is controlled so that a measured value of the density of the powder or granular material downstream of the confluence coincides with the set value; In the step of controlling the flow rate of the powder or granular material to a command value indicated by the destination of the transfer, an opening degree of the transfer line flow control valve is controlled so that the supply flow rate of the powder or granular material to the destination of the transfer, estimated based on the sum of the flow rate of the carrier gas flowing through the transfer line upstream of the junction and the flow rate of the gas flowing into the transfer line from the delivery line, and the set value of the density, matches the command value. Control method.

9. a transfer line that transfers the powder or granular material flowing out of the tank to a destination; a discharge line that connects the tank and the transfer line and supplies the powder or granular material flowing out of the tank to the transfer line; a transfer line flow control valve provided on the transfer line; and a discharge line flow control valve provided on the discharge line. controlling the density of the powder or granular material downstream of a junction of the feed line and the conveying line to a predetermined set value; a step of controlling a flow rate of the powder or granular material to be supplied to the destination through the conveying line to a command value instructed by the destination; and In the step of controlling the density of the powder or granular material to a predetermined set value, an opening degree of the feed line flow control valve is controlled so that a measured value of the density of the powder or granular material downstream of the confluence coincides with the set value; In the step of controlling the flow rate of the powder or granular material to a command value specified by the destination, the program executes a process of controlling the opening of the conveyance line flow control valve so that the supply flow rate of the powder or granular material to the destination, estimated based on the sum of the conveyance gas flow rate flowing through the conveyance line upstream of the confluence and the gas flow rate flowing into the conveyance line from the cut-out line, and the set value of the density, matches the command value.

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