JP2004010357A - Granular and powdery material intermittent discharge apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a granular and powdery material intermittent discharge apparatus capable of surely performing constant-quantity intermittent discharge of the granular and powdery material regardless of vibration in pressure of a granular and powdery material transport pipe. <P>SOLUTION: The granular and powdery material intermittent discharge apparatus for intermittently discharging a constant quantity of a granular and powdery material in storing containers 3a, 3b to a transport pipe 10 for air-transporting the granular and powdery material, includes container pressure detecting means 23a, 23b for detecting the pressure in the storing containers 3a, 3b, transport pipe pressure detecting means 25a, 25b for detecting the pressure in the transport pipe 10, and pressure regulating means 27a, 27b for regulating the pressure in the storing containers 3a, 3b to be higher than the pressure in the transport pipe 10 according to the detection results of the container pressure detecting means 23a, 23b and the transport pipe pressure detecting means 25a, 25b. <P>COPYRIGHT: (C)2004,JPO

Description

(4) The present invention relates to a granular material extracting apparatus for quantitatively extracting fine particles such as pulverized coal and waste plastic stored in a storage hopper or the like into a transport pipe for airflow transport.

FIG. 2 shows an example of a conventional pulverized material extracting apparatus for realizing a method of injecting pulverized coal into a blast furnace. In FIG. 2, two powder blowing hoppers 62 and 62 'arranged in parallel below a powder storage hopper 61 are switched to continuously and stably blow pulverized coal into a blast furnace.

Two powder blowing hoppers 62, 62 'arranged in parallel below the pulverized coal C storage hopper 61 are filled pipes 63, 63 provided with filling valves 63A, 63A' and filling valves 63B, 63B ', respectively. 'Is connected to the lower part of the powder storage hopper 61 by a'. Below the powder blowing hoppers 62, 62 ', there are provided rotary powder feeders 64, 64' with stirring blades. At the lower part of the powder supply devices 64 and 64 ', there is a cutting roller, which is cut by cutting pipes 65 and 65' equipped with cutting valves 65A and 65A 'and cutting valves 65B and 65B'. It is connected to a powder conveying pipe 66 to the blast furnace.

Pressurized gas blowing pipes 67, 67 'for adjusting the pressure in the blowing hoppers 62, 62' are attached to the powder blowing hoppers 62, 62 '. By controlling the pressurized gas blowing adjusting valves 68, 68 'according to the pressure values in the hoppers 62, 62' to control the flow rate of the pressurized gas blown from the pressurized gas blowing pipes 67, 67 ', the powder blowing hopper The pressure within 62, 62 'is maintained at a predetermined value.

A fluidizing gas injection pipe 69 having a plurality of gas blowers for fluidizing the pulverized coal in the powder supply devices 64 and 64 ′ is provided above the stirring blades in the powder supply devices 64 and 64 ′. 69 'is mounted, from which pressurized gas is blown into the powder feeders 64, 64' to maintain the pulverized coal in a fluidized state. 70, 70 'are fluidizing gas injection regulating valves.

In addition, conveying auxiliary gas blowing pipes 71, 71 'are attached near the cutouts of the powder supply devices 64, 64', and when pulverized coal is cut out from the cutouts, pressurized gas is blown to pulverized coal. To assist in cutting and transporting Reference numerals 72, 72 'denote transfer auxiliary gas on-off valves.

The upper part of each powder blowing hopper 62, 62 'is connected to the upper part of the powder storing hopper 61 by exhaust pipes 74, 74' provided with exhaust pressure valves 73, 73 ', and the pressure in the powder blowing hoppers 62, 62' is controlled. The pressure of the powder storage hopper 61 can be adjusted.

The weight measurement values at the load cells 75, 75 'for measuring the weight of the pulverized coal in the powder blowing hoppers 62, 62' are transmitted to the supply control devices 76, 76 ', and are supplied by the supply control devices 76, 76'. The driving of the driving devices M and M 'is controlled to control the rotation of the stirring blade, and the ever-changing weight in the powder blowing hoppers 62 and 62' is measured and input to the switching control device 77 for arithmetic processing. When the measured value reaches a predetermined value, the opening and closing of various valves is controlled via the supply control device 77 to switch between the powder blowing hoppers 62 and 62 '.

In the prior art configured as described above, the plurality of powder blowing hoppers 62 and 62 ′ arranged in parallel are alternately switched to suppress the variation in the amount of pulverized coal cut out to the transport pipe 66, thereby achieving stable operation. By stably injecting the pulverized coal into the blast furnace over a long period of time, the operation of the blast furnace is stabilized (for example, see Patent Document 1).
Japanese Patent Publication No. 07-033530 (page 2-3, FIG. 1)

However, in the conventional example configured as described above, the pressure in the blowing hoppers 62 and 62 ′ is adjusted, and the pressure of the transport auxiliary gas supplied to the powder supply devices 64 and 64 ′ (hereinafter, “cut-out side pressure”). Is set irrespective of the pressure in the powder transfer pipe 66 without considering the pressure change in the powder transfer pipe 66. On the other hand, the pressure in the powder transfer pipe 66 constantly fluctuates depending on various factors such as the flow state of the powder, the powder flow rate, the gas flow rate, and the powder supply destination pressure. For this reason, if the cut-out side pressure is set independently of the pressure in the powder conveying pipe 66, depending on the relationship between the two pressures, when cutting out the powder from the blowing hoppers 62, 62 ', the following will occur. Problems arise.

That is, when the cut-out side pressure is lower than the powder transfer tube pressure, the powder is cut out from the lower pressure to the higher pressure, and the cut-out becomes impossible.
On the other hand, when the cut-out side pressure is considerably higher than the powder transfer pipe pressure, the powder is pushed out to the powder transfer pipe 66, and the fixed amount cut-out cannot be performed.

The present invention has been made in order to solve such a problem, and it is an object of the present invention to obtain a granular material cutting device capable of reliably performing quantitative cutting of a granular material regardless of pressure fluctuation of a granular material conveying pipe. I have.

The granular material cutting device of the present invention is a granular material cutting device that quantitatively cuts a granular material in a storage container into a transfer pipe that transports the granular material in an air stream, and detects a pressure in the storage container. Container pressure detection means, a conveyance pipe pressure detection means for detecting the pressure in the conveyance pipe, and a pressure in the storage container in the conveyance pipe based on the detection results of the container pressure detection means and the conveyance pipe pressure detection means. Pressure adjusting means for adjusting the pressure to be higher than the pressure.

In addition, the storage container includes a plurality of blowing hoppers arranged in parallel below the storage hopper, and the plurality of blowing hoppers are alternately filled with the particles from the storage hopper to continuously store the particles. It is characterized by being cut out.

Therefore, the granular material cutting-out apparatus of the present invention comprises a container pressure detecting means for detecting the pressure in the storage container, a transport pipe pressure detecting means for detecting the pressure in the transport pipe, the container pressure detecting means, and the transport pipe pressure. Pressure adjusting means for adjusting the pressure in the storage container to be higher than the pressure in the transfer pipe based on the detection result of the detection means, so that the pressure in the storage vessel is higher than the pressure in the transfer pipe. It is always possible to set a high value, and it is possible to reliably and smoothly perform the quantitative cutout of the granular material.

In addition, the storage container includes a plurality of blowing hoppers arranged in parallel below the storage hopper, and the plurality of blowing hoppers are alternately filled with the granular material from the storage hopper to continuously cut out the granular material. As a result, stable supply of the granular material becomes possible.

FIG. 1 is an explanatory view of an embodiment of a granular material cutting device according to the present invention. In FIG. 1, reference numeral 1 denotes a storage hopper for storing powder and granules, 3a and 3b denote powder and particle blowing hoppers installed in parallel below the storage hopper 1 via inlet pipes 5a and 5b, and 7a and 7b denote inlet pipes. It is an introduction valve provided in the middle of 5a, 5b.
Reference numerals 9a and 9b denote cutting pipes connecting the discharge ports of the powder-particle blowing hoppers 3a and 3b and the conveying pipe 10, reference numerals 11a and 11b denote feeders installed on the cutting pipes 9a and 9b to quantitatively cut the powder and granules, 13a and 13b are cutting valves installed in the cutting pipes 9a and 9b.

15a and 15b are pressurized gas pipes for introducing pressurized gas such as pressurized air into the powder / particle blowing hoppers 3a and 3b, and 17a and 17b are pressurized gas regulating valves provided in the pressurized air pipes 15a and 15b. , 19a and 19b are discharge pipes for discharging the pressurized gas in the powder-particle blowing hoppers 3a and 3b, and 21a and 21b are discharge valves provided in the discharge pipes 19a and 19b.

Reference numerals 23a and 23b denote hopper pressure detectors for detecting the pressure in the granular material blowing hoppers 3a and 3b, reference numerals 25a and 25b denote transport pipe pressure detectors for detecting the pressure of the transport pipe 10, and reference numerals 27a and 27b denote hopper pressure detectors. 23a, 23b and detection signals from the conveying pipe pressure detection devices 25a, 25b are input, and the opening / closing and opening degree of the pressurized gas regulating valves 17a, 17b are adjusted based on the detection signals, whereby the powder-particle blowing hopper is provided. A pressure control device for controlling the pressure in 3a and 3b.
The pressure in the powder blasting hoppers 3a and 3b is controlled to be slightly higher (about 0.1 to 0.5 kg / cm ² ) than the pressure in the transport pipe 10.

Next, the operation of the present embodiment configured as described above will be described. In the present embodiment, the granular material fed into the storage hopper 1 is introduced into the blowing hoppers 3a and 3b, and the granular material is conveyed by switching and using the blowing hoppers 3a and 3b. It is cut out continuously into a tube 10.

First, in order to charge the granular material into the storage hopper 1 and introduce it into the blowing hopper 3a, the discharge valve 21a is opened from the state in which all the valves are closed, and then the introduction valve 7a is opened. . Thereby, the granular material in the storage hopper 1 is introduced into the blowing hopper 3a. The weight of the blowing hopper 3a is measured by a load cell (not shown), and when the weight reaches the upper limit, the introduction valve 7a is closed and the discharge valve 21a is further closed.

Next, the pressurized gas regulating valve 17a is opened, and pressurized gas is supplied into the blowing hopper 3a. At this time, the pressure control device 27a inputs the pressure signals of the transport pipe pressure detecting device 25a and the hopper pressure detecting device 23a, and as described above, the pressure in the powder and particle blowing hoppers 3a and 3b is The opening and closing and the opening degree of the pressurized gas adjusting valve 17a are adjusted so as to be slightly higher (about 0.1 to 0.5 kg / cm ² ) than the pressure.

As described above, when the pressure in the blowing hopper 3a reaches a predetermined value, the supply device 11a is operated and the cutout valve 13a is opened to quantitatively cut out the granular material from the cutout pipe 9a to the transport pipe 10.
During the cutting of the granular material, the pressure control device 27a constantly monitors the pressure in the conveying pipe 10 and the pressure in the blowing hopper 3a by the above-described method, and determines the relationship between the two pressures as described above. The pressure in the granule blowing hopper 3a is adjusted to be slightly higher (about 0.1 to 0.5 kg / cm ² ) than the pressure in the transport pipe 10.

圧 力 By performing such pressure control, it is possible to reliably perform the quantitative cutout of the powder and the granular material from the blowing hopper 3a to the transport pipe 10.

When the cutout from the blowing hopper 3a is started, the discharge valve 21b is opened, and then the introduction valve 7b is opened to introduce the powdery material in the storage hopper 1 into the blowing hopper 3b. The valve 7b and the discharge valve 21b are closed to wait. The introduction of the granular material into the blowing hopper 3b may be performed immediately after the introduction into the blowing hopper 3a is completed, or may be performed after a lapse of a predetermined time from the start of cutting out from the blowing hopper 3a. By the end of the cutting of the granular material in the blowing hopper 3a, the introduction of the granular material into the blowing hopper 3b is completed.

When the weight of the blowing hopper 3a is reduced to the lower limit value by the cutting from the blowing hopper 3a, the operation of the supply device 11a is stopped, the cutting valve 13a and the pressurized gas regulating valve 17a are closed, and the discharge valve 21a is further closed. Open to discharge the pressurized gas in the blowing hopper 3a.
The cutting operation from the blowing hopper 3b is started together with the cutting stop operation from the blowing hopper 3a. The cutting operation from the blowing hopper 3b is the same as the above-described cutting operation from the blowing hopper 3a.
As described above, the two blowing hoppers 3a and 3b are sequentially switched to perform continuous cutting.

In addition, when switching from the blowing hopper 3a to the blowing hopper 3b, the cutout amount of the supply device 11a is gradually reduced when the remaining amount of the granular material in the blowing hopper 3a, which is the stop side, becomes small. At the same time, if the cut-out amount of the supply device 11b of the blowing hopper 3b, which is the cut-out start side, is gradually increased, the two can be switched smoothly.

As described above, in the present embodiment, the pressure in the conveying pipe 10 and the pressure in the blowing hoppers 3a, 3b are adjusted so that the pressure in the powder / particle blowing hoppers 3a, 3b is constantly adjusted. Since the pressure is slightly higher than the internal pressure, the cutout from the blowing hoppers 3a and 3b to the transport pipe 10 can be performed smoothly and quantitatively.

The present invention can be used for a granular material cutting device that quantitatively cuts a granular material stored in a storage hopper or the like.

FIG. 1 is an explanatory diagram of an embodiment of a granular material cutting device according to the present invention. It is explanatory drawing of the example of the conventional granular material cutting-out apparatus.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Storage hopper 3a, 3b Blow-in hopper 9a, 9b Cut-out pipe 10 Transport pipe 11a, 11b Supply device 17a, 17b Pressurized gas regulating valve 23a, 23b Hopper pressure detector 25a, 25b Transport pipe pressure detector 27a, 27b Pressure control apparatus

Claims (2)

In a powder and granule cutting device for quantitatively cutting out the granules in the storage container into a conveying pipe for conveying the granules in an air stream,
Container pressure detecting means for detecting the pressure in the storage container, transport pipe pressure detecting means for detecting the pressure in the transport pipe, and the storage based on the detection results of the container pressure detecting means and the transport pipe pressure detecting means. And a pressure adjusting means for adjusting the pressure in the container to be higher than the pressure in the transport pipe. The storage container includes a plurality of blow hoppers arranged in parallel below a storage hopper, and the plurality of blow hoppers are alternately filled with the powder and granules from the storage hopper to continuously cut out the powder and granules. 2. The apparatus for cutting out powdery and granular materials according to claim 1, wherein:

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