JPS59213435A - Downflow controlling method in fluidized bed of powder and particulate body - Google Patents

Abstract

PURPOSE:To control the flow rate of a powder and particulate body by controlling the amt. of feed by providing a weir, etc. to the bottom part of a transporting pipe, increasing the density of the downflow of the powder and particulate body which is fluidized in the transporting pipe, and supplying gas to the midway of the transporting pipe. CONSTITUTION:In a process for transporting a powder and particulate body P in a transporting pipe 6 in the fluidized state of P as it is fluidized in a closed tank 1, the P is flowed downward by the gravity by extending the transporting pipe 6 almost vertically; and a bent pipe, horizontal pipe, inclined pipe, stationary reduced pipe, and a weir, etc. are provided to the bottom part of the transporting pipe 6 to increase the density of the downflow of P. Further, gas is fed from gas feeding pipes 8-10 to the midway of the transporting pipe 6, and the flow rate of P is controlled by controlling the amt. of the feed of the gas. In this way, the flow rate of the downflow of P of high density is controlled.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a method for transporting powder and granular materials, and in particular, the present invention relates to a method for transporting powder and granular materials, and in particular, the present invention relates to a method for transporting powder and granular materials, and in particular, to fill the powder and granular materials fluidized by fluidized bed equipment to the same degree as in the fluidized bed equipment by gravity downward flow. This invention relates to a downward flow control method when transporting at a high density.

[Background of the invention]

In high-temperature, high-pressure gasification furnaces, iron ore pre-reduction furnaces, etc., powder and granules are fluidized in a pressurized tank having a fluidized bed, and distributed and transported in a high-temperature, high-concentration state. Powder is at high temperature,
For example, in the temperature range of 1000°C or higher, the flowability of the powder or granular material with agglomerated brim changes compared to that at room temperature2. Due to constraints such as material, thermal expansion coefficient, physical and chemical durability, etc., it has been extremely difficult to conventionally measure and control the flow rate of powder and granular materials. Here, in order to maintain a high concentration of powder and granules when they are transported under high pressure, the only way to maintain a high concentration of the powder and granules is to transport the powder and granules by descending and discharging them from the pressure tank using gravity. There's no way.

That is, in the case of horizontal transport and vertical upward transport, a waste flow rate exceeding the floating speed of the powder is required, but in the case of high pressure, the amount of gas used increases in proportion to the absolute pressure. However, in the case of gravity downward flow, the amount of scum filling between the particles of the tightly packed powder and granules is sufficient. Examples of this include when feeding raw material from the pre-reduction furnace in a fine ore melting and refining furnace to a melting and reducing furnace via a downcomer, or when feeding pulverized coal from a pressurized tank to a high-pressure gasification furnace. Detection of the flow rate of the downward flow of the powder and granular material and control thereof have not been performed at all in the past.

[Purpose of the invention]

This invention was made in view of the problems of the prior art, and it is possible to reduce the mass of the powder or granule when transporting the fluidized powder or granule by gravity in a tightly packed transport pipe extending below the road. It is an object of the present invention to provide a method for transporting powder and granular material that can control the flow rate.

[Summary of the invention]

The method for transporting powder and granular material according to the present invention includes a curved pipe, a horizontal pipe, an inclined pipe, a fixed throttle, a fence, etc., provided at the lower part of a gravity descending transport pipe that extends below the road, and these are used to transport the fluidized powder in the transport pipe. By maintaining the density of the downflow of granules at the same level as in the fluidized bed equipment, and by supplying gas to the middle of the transport pipe and controlling the amount of gas supplied, the density of the powder on the secondary side of the gravity down transport pipe is reduced. This is to reduce the frictional force of the body and control the downward mass flow rate of the granular material.

In this control, fluctuation phenomena such as pressure loss in a predetermined section of the transport pipe, noise or pressure vibration inside the transport pipe,
Alternatively, by measuring the flow rate of the powder based on the pressure difference between the pressure at the lower end of the transport pipe and the merging main pipe connected to the lower end of the transport pipe, feedback control of the flow rate of the powder becomes possible.

[Embodiments of the invention]

Next, an embodiment of a powder transport device used in the powder transport method according to the present invention will be described based on the drawings.

In FIG. 1, the powder transport device is equipped with a tank 1 serving as a fluidized bed facility for storing and fluidizing powder P, and on the side of tank 1 there are a plurality of holes for discharging powder P. A cutting nozzle 2.2' is provided. Although two cutting nozzles are shown in the figure, there is no need to limit the number to this, and the number of the nozzles may be one or two or more. A fluidized bed 3 is provided at the bottom of the tank 1, and gas G is supplied to the lower side of the fluidized bed 3 from a gas pressure source 4 inside the tank 1. As a result, the powder P in the tank 1 is fluidized,
The fluidized powder P and the gas G pass through the cutting nozzle 2.
It is discharged from 2'. A transport pipe 6 is connected to the cutting nozzle 2.2' via an on-off pulp 5, and the transport pipe 6 is a descending pipe that extends approximately downward. It is connected to the confluence main pipe 7. With this configuration, the powder and granules are transported down the downcomer by gravity in a tightly packed state.

Gas supply pipes 8, 9, and 10 are connected to the vertically extending portions of the transport pipe 6, that is, the upper and lower ends of the downcomer pipe, and the curved parts where the transport pipe 6 changes from the vertical direction to the horizontal direction. The supply pipes s, 9.10 have control valves 11, 12 .
Gas pressure sources 14, 15, 16 are connected via 13 respectively. Further, an aeration device 17 is provided in the horizontal portion of the transport pipe 6 to control the amount of discharge due to gravity downward flow by reducing the pipe resistance in the horizontal portion. A gas pressure source 19 is connected thereto.

Damage force detection transmission tube 20.2 at the upper and lower ends of the downcomer pipe of the transport pipe 6
1 is provided, and the internal pressure detection transmitter 20.21 is connected to the differential pressure transmitter 22. The differential pressure transmitter 22 calculates the difference between the detected pressures of the pressure detection transmitters 20 and 21, and this detected pressure difference is inputted to the mass flow controller 24 via the changeover switch 23.

The downcomer of the transport pipe 6 is further provided with a fluctuation phenomenon detector 25 , which fluctuation phenomenon detector 25 is connected to a spectral density detector 26 .

The fluctuation phenomenon detector 25 detects fluctuation phenomena such as noise or pressure vibration in the transport pipe 6, and this fluctuation phenomenon has a correlation with the flow rate of powder and granular material. The spectral density of the fluctuation phenomenon detected by the phenomenon detector 25 is calculated. The spectral density detector 26 is also connected to the mass flow controller 24 via the changeover switch 23.
The mass flow controller 24 is connected to the differential pressure transmitter 2
Based on the differential pressure output from 2 or the spectral density at a specific frequency of the fluctuation phenomenon output from the spectral density detector 26, the granular material P in the transport pipe 6 is
This is a mass flow controller that determines the mass flow rate of .

Pressure detection transmitters 27 and 28 are provided near the horizontal portion of the transport pipe 6 and the junction between the transport pipe 6 and the confluence main pipe 7, and these pressure detection transmitters 27 and 28 are connected to a differential pressure transmitter 29. It is connected to the. The differential pressure transmitter 29 is also connected to the mass flow controller 24 via the changeover switch 23.
4 calculates the mass flow rate of the powder P flowing into the merging main pipe 7 from the transport pipe 6 based on the difference in the transmission pressures of the pressure detection transmitters 27 and 28.

The mass flow controller 24 is connected to the control valve 11.12.13.18 via a changeover switch 30, and the mass flow controller 24 is connected to the control valve 11.12.13.
4 is a differential pressure gauge 22.29 and a spectral density detector 2
The control valves 11.12, 13.18 are feedback-controlled based on the feedback signal indicating the flow rate from the control valve 5.

The horizontal part of the transport pipe 6 serves as a local flow resistance part against the flow of the powder P in the transport pipe 6, while the gas supply pipes 8.9.
An increase in the gas supplied into the transport pipe 6 from the air diffuser 10 and the air diffuser 17 acts to increase the mass flow rate of the powder P. Therefore, the mass flow rate of the powder P can be controlled by controlling the control valves 11.12 and 13.18, and the flow rate control range of the powder P is sufficiently expanded by the horizontal portion of the transport pipe 6.

The main supply gas G' is supplied into the confluence main pipe 7, whereby the powder and granular material P that has flowed into the confluence main pipe 7 from the transport pipe 6 is
are transported smoothly within the confluence main pipe 7.

Almost the whole of the transport pipe 6 extends vertically, and there is a horizontal pipe part at the lower end, so that the powder and granular material P inside the transport pipe 6 is
can be transported in high density.

Although various configurations can be adopted as the air diffuser 17, the configurations shown in FIGS. 2 and 3 are preferable, for example.

In FIG. 2, the air diffusion state 17 is such that an annular air diffuser plate wind box 31 is formed on the horizontal portion 50 of the transport pipe 6, and an annular or window-shaped porous air diffuser is formed at the inner end of this wind box 31. It is closed by a plate 32. The control valve 1 is installed on the outer periphery of the wind box 31.
A pipe line 33 is connected to the pipe line 33, and gas G is supplied from the pipe line 33 into the wind box 31. Gas G in the wind box 31 passes through the porous diffuser plate 32 and flows into the transport pipe 6.

In FIG. 3, the air diffuser 17 has a multi-spiral through groove 34 bored in the horizontal part 50 of the transport pipe 6, and the through groove 34 is surrounded by a wind box 36 having an internal space 35. It is surrounded. A conduit 37 is connected to the outer periphery of the wind box 36 from the control valve 18, and gas G is supplied from the conduit 37 into the internal space 35 of the wind box 36. Gas G in the internal space 35 of the wind box flows into the horizontal portion 50 through the through groove 34. Since the through groove 34 is formed in a spiral shape, the gas G passing through the through groove 34 acts to cause the powder P to travel in the circumferential direction, thereby fluidizing the powder P. is significantly promoted, the pipe wall frictional resistance of the granular material in the horizontal section is reduced, and the mass flow rate is increased.

Note that the present invention is not limited to the above embodiments, and instead of the horizontal portion, the local fluid resistance portion may include a bent portion,
A fixed diaphragm, s, etc. can be used.

Furthermore, the above configuration may be performed using one or more other cutting nozzles 6'.
It can also be applied to mass flow control in

Since the powder P is sent by gravity downward flow from each cutting nozzle 6,6', there will be no interference between the transport pipes regarding flow rate control.

The changeover switch 23 inputs a signal from either the differential pressure transmitter 22.29 or the spectral density detector 26 to the flow rate controller 24, and the changeover switch 30 inputs the signal from the differential pressure transmitter 22.29 or the spectral density detector 26 to the flow rate controller 24.
2. Selectively control one, two or three of the flow rate controllers 24 out of 13.18.

〔Effect of the invention〕

As mentioned above, the method for transporting powder and granular material according to the present invention includes providing a bent P pipe, an inclined pipe, a fixed throttle, a box, etc. at the lower part of the transport pipe,
These make it possible to increase the density of the fluidized powder descending flow in the transport pipe, and further control the flow rate of the powder by supplying gas to the middle of the transport pipe and controlling the supply amount of this gas. Therefore, the flow rate of the descending high-density powder and granular material can be controlled.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an embodiment of the powder transportation method according to the present invention, Fig. 2 is a longitudinal sectional view showing an example of a booster in the same embodiment, and Fig. 3 is a block diagram showing another example of the booster. FIG. 1...Fluidized bed equipment, 6...Transport pipe, 7...
・Merge main pipe, 81.92.10...gas supply pipe,
11.1213...control valve, 14,15.
16... Gas pressure source, 17... Diffuser, 18
...Control valve, 19...Gas pressure source, 20.2
1... Pressure detection transmitter, 22... Differential pressure transmitter,
24... Mass flow controller, 25... Fluctuation phenomenon detector, 26... Spectral density detector, 27.
28...Pressure detection transmitter, 29...Differential pressure transmitter. Agent Tatsuyuki Unuma (and 1 other person) Procedural amendment July 73, 1980 Patent Application No. 77882 2, Title of invention 3, Relationship with the person making the amendment Patent applicant name Name Denka Engineering Co., Ltd. 4, Agent 7, Application subject to amendment and the title of the invention in the specification, the scope of claims in the specification, the detailed description of the invention in the specification, drawings, -
(2) The claims of the specification are amended as shown in the appendix. (3) The “fluidized bed” in the first line of page 4 of the specification is moved in a sealed tank. "bed, fluidized bed, spouted bed". change. (5) “Inside fluidized bed equipment” on page 4, line 6 of the specification is changed to “
"Inside moving layer equipment". (6) Add the following sentence next to "Regarding." on page 4, line 4 of the specification. "Here, the moving bed refers to a layer of powder and granular material in which the rising speed of gas is lower than the minimum fluidization speed of the powder and granular material in a tank with a fluidized bed, and a fluidized bed is defined as Refers to the case where the gas rising speed is higher than the minimum flow rate,
The spouted bed refers to a case where the bottom of the tank is made into a morning glory shape and gas is introduced into the tank to fluidize the granular material. Therefore, the powder packing density in the tank (
Powder mass/gas density) is 1 for moving bed, fluidized bed, and spouted bed.
Get low on shellfish. In addition, a fluidized bed includes a moving bed in a broad sense, a fluidized bed in a narrow sense, and a spouted bed; hereinafter, the term fluidized bed refers to a fluidized bed in a narrow sense. (7) Specification No. 5
``Flow'' in line 19 of the page is changed to ``transfer.'' (8) In the 19th line of page 6 of the specification, next to ``It is.'' it says, ``The tank 1 does not have to be limited to a fluidized bed facility as in this embodiment, but may be, for example, a moving bed facility or a spouted bed facility. (9) In the second line of page 13 of the specification, [high density of downward flow] is changed to "keep the downward flow in a high density state, and change it to j. Amended as shown in the attached sheet.In the method of transporting powder and granular material by supplying it into a transport pipe, the transport pipe is extended in the direction below the road, and the powder and granular material is lowered by gravity, and the transport pipe is Bent pipe, horizontal pipe, inclined pipe,
Fixed throttles, weirs, etc. are installed to maintain the density of powder and granules in the transport pipe at approximately the same density as the packing density of the perturbation bed, and to supply gas to the middle of the transport pipe and to control the amount of this gas supplied. A method for controlling a downward flow of powder and granules, characterized in that the flow rate of powder and granules is controlled by: (2) In a method of transporting powder and granules by supplying the powder and granules in a fluidized state in a closed tank into a transport pipe, the transport pipe is extended downward on the road so that the powder and granules descend by gravity, and , By installing bent pipes, horizontal pipes, inclined pipes, fixed throttles, weirs, etc. at the bottom of the transport pipe, the density of powder and granules inside the transport pipe can be controlled!
The mass flow rate of the powder is controlled by keeping the packing density approximately the same as the packing density of the moving bed, supplying gas midway through the transport pipe, and controlling the supply amount of this gas. 1. A method for controlling a downward flow outside of powder particles, characterized in that the mass flow rate of the powder material is detected based on the pressure loss in the section, and the supply amount of the gas is controlled based on the detected value of the mass flow rate. (3) In a powder transport method in which the powder is fluidized in a closed tank and sent through a transport pipe, the transport pipe is extended toward the bottom of the road to lower the powder by gravity, and
Bent pipes, horizontal pipes, inclined pipes, fixed throttles, weirs, etc. are installed at the bottom of the transport pipe to increase the density of the powder and granules in the transport pipe, and gas is supplied to the middle of the transport pipe and this The flow rate of powder and granular material is controlled by controlling the amount of gas supplied, and during this control, fluctuation phenomena such as noise or pressure vibration caused by the downward flow of powder and granular material in the transport pipe are detected. A signal spectral density at a specific frequency of a fluctuation phenomenon is determined, a mass flow rate of the powder or granular material is determined based on this signal spectral density, and the supply amount of the gas is controlled based on the thus determined mass flow rate. Characteristic method for controlling the downward flow of powder and granular materials. (4) In a powder transport method in which the powder is fluidized in a closed tank and sent through a transport pipe, the transport pipe is extended downwards on the road to lower the powder by gravity, and the transport pipe is Bent pipes, horizontal pipes, inclined pipes, fixed throttles, weirs, etc. are installed at the bottom to increase the density of powder and granules in the transport pipe, and to supply gas to the middle of the transport pipe and to reduce the amount of gas supplied. The mass flow rate of the powder is controlled by controlling the
The lower end of the descending transport pipe is connected to the merging main pipe, the powder and granules are sent from the transport pipe to the merging main pipe, the differential pressure between the lower part of the transport pipe and the merging main pipe is detected, and the powder and granular material is Find the mass flow rate of
A method for controlling the downward flow of a powder or granular material, characterized in that the supply amount of the gas is controlled based on the mass flow rate of the powder or granular material determined in this way.

Claims (4)

[Claims] (1) In a method of transporting powder and granules by supplying them into a transport pipe in a fluidized state using fluidized bed equipment, the transport pipe is extended downward on the road and the powder and granules are lowered by gravity. In addition, bends, horizontal pipes, inclined pipes, fixed throttles, roots, etc. are provided at the bottom of the transport pipe to maintain the density of the powder in the transport pipe to be approximately the same as in the fluidized bed equipment. 1. A method for controlling the downward flow of a fluidized bed of powder and granular material, characterized by controlling a flow meter of the powder and granular material by supplying gas to the flow meter and controlling the amount of gas supplied. (2) In a method of transporting powder and granules by supplying them into a transport pipe in a fluidized state using fluidized bed equipment,
The transport pipe is extended downwards on the road to allow the powder and granules to fall by gravity, and the lower part of the transport pipe is equipped with bent pipes, horizontal pipes, inclined pipes, etc.
By providing fixed throttles, fences, etc., to maintain the density of the powder in the transport pipe to be approximately the same as in the fluidized bed equipment, and by supplying gas to the middle of the transport pipe and controlling the 6t of gas supply. The mass flow rate of the powder and granular material is controlled, and during this control, the mass flow rate of the powder and granular material is detected based on the pressure loss in a predetermined section of the transport pipe, and the supply amount of the gas is determined based on the detected value of the mass flow rate. A method for controlling the downward flow of a powder fluidized bed. (3) Fluidize powder and granules using fluidized bed equipment 1. In a method for transporting powder and granules in a transport pipe in an open state, the transport pipe is extended downward on the road so that the powder and granules are lowered by gravity, and a bent pipe and a horizontal pipe are installed at the bottom of the transport pipe. By providing inclined pipes, fixed throttles, roots, etc., to increase the density of the powder and granular material in the transport pipe, and by supplying gas midway through the transport pipe and controlling the amount of gas supplied, the powder and granular material can be increased. During this control, a fluctuation phenomenon such as noise or linear pressure vibration caused by the downward flow of the powder or granular material in the transport pipe is detected7, and the signal spectral density at a specific frequency of this fluctuation phenomenon is determined. A powder or granular material characterized in that the mass flow rate of the powder or granular material is determined based on this signal spectrum density, and the supply of the gas is controlled based on the thus determined quality...flow h1-. Method for controlling downward flow in a fluidized bed. (4) In a method of transporting powder and granules that are fluidized using v&dynamic bed equipment and transported through a transport pipe using t, r, and u, the transport pipe is extended downward on the road and the granules are transported by gravity. In addition to lowering the transport pipe, a bent pipe, horizontal pipe, inclined pipe, fixed throttle, fence, etc. are installed at the bottom of the transport pipe to increase the density of the powder and granular material in the transport pipe, and feed waste to the middle of the transport pipe. In addition, by controlling the supply amount of this gas, the mass flow 2 of the powder and granular material is controlled, and the lower end of the descending transport pipe is connected to the merging main pipe to send the powder and granular material from the transport pipe to the merging main pipe and transported. The pressure difference between the lower part of the pipe and the merging main pipe is detected, the quality of the powder and granule is determined based on this pressure difference, and the flow rate of the gas is determined based on the mass flow rate of the powder and granule thus determined. A method for controlling the downward flow of a powder/granular material flow@layer, characterized by controlling the supply amount.