JP2001130745A - Method and apparatus for transporting granular material - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To improve the transportation efficiency of a granular material by enabling stable transportation of the granular material. SOLUTION: A pressurized container 1 for accommodating a powdery and granular material 2, a blowing pipe 4 for blowing a pressurized gas from the bottom of the pressurized container 1 into the container 1, a powder pressurized by the pressurized gas In a device for transporting a granular material having a transport pipe 5 for transporting the body 2 to the outside, a pressure transmitter 11 for detecting a gas pressure in the pressurized container 1 and a granular material 2 in the pressurized container 1 A particulate material detecting means 16 for detecting whether or not gas remains, a nozzle device 12 for ejecting gas from the side wall of the pressurized container into the container, and a granular material detecting means 1
6, when it is detected that the granular material 2 remains in the pressurized container 1, and when the gas pressure detected by the pressure transmitter 11 falls below a predetermined set value,
The device 1 is configured to eject gas by the nozzle device 12.
And a control device 14 for controlling the control device 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for transporting powdery particles such as quicklime or soda ash contained in a pressurized container to the outside by using a pressurized gas flow such as nitrogen or air. .

[0002]

2. Description of the Related Art As a conventional method for transporting such a granular material, for example, as shown in FIG. 2, a powder is added into a pressure vessel a through a blowing pipe b connected to the bottom of the pressure vessel a. A pressurized gas stream is blown, and the granular material c pressed by the pressurized gas stream is transported by a transport pipe d
There is known an apparatus which is transported to the outside via a computer.

[0003]

By the way, in the above-mentioned conventional method of transporting the granular material, the granular material c in the pressurized container a is not used.
May be solidified and fixed in a mortar shape on the inner surface of the side wall of the pressurized container a. In such a case, since the granular material c does not fall to the bottom of the pressurized container a, the pressurized gas flow is reduced. A so-called “blow-through” that escapes through d occurs, and the transport of the granular material c becomes impossible. Further, since the supply of the granular material c into the pressurized container a is usually performed for each batch, when the above-mentioned “blow-through” occurs, the granular material c remains in the pressurized container a. Nevertheless, it is necessary to stop the injection of the pressurized gas flow and supply new granules c into the pressurized container a, so that the transport amount of the granules c per batch is reduced and the transport efficiency is reduced. There is the disadvantage of lowering.

SUMMARY OF THE INVENTION The present invention has been made to solve such a disadvantage, and a method of transporting a granular material capable of stably transporting the granular material and improving the transport efficiency of the granular material. And a transport device.

[0005]

In order to achieve the above object, a method for transporting a granular material according to a first aspect of the present invention is to blow a granular material contained in a pressurized container from the bottom of the pressurized container. In the method for transporting a granular material using a compressed gas flow, the gas pressure in the pressurized container and the presence or absence of the granular material are monitored, and the granular material is subjected to the compression. When the gas pressure drops to a predetermined value or less while remaining in the pressure vessel, gas is ejected from the side wall of the pressure vessel into the pressure vessel.

According to a second aspect of the present invention, there is provided an apparatus for transporting a granular material, comprising: a pressurized container accommodating the granular material; blowing means for blowing a pressurized gas from the bottom of the pressurized container into the pressurized container; A transport device for transporting the granular material pressurized by the pressurized gas to the outside, wherein a gas pressure detecting means for detecting a gas pressure in the pressurized container; A powder / granule detecting means for detecting whether or not the powder / granular material remains in the container; a gas blowing means for blowing gas from the side wall of the pressurized container into the pressurized container; Means for detecting that powder particles remain in the pressurized container, and when the gas pressure detected by the gas pressure detecting means falls below a predetermined set value, Control means for controlling the gas ejection means so that the gas is ejected by the ejection means. Characterized in that was.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram for illustrating a granular material transporting apparatus according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a pressurized container, and a supply pipe 3 that supplies the granular material 2 into the pressurized container 1 for each batch is connected to an upper portion of the pressurized container 1. A blow pipe 4 for blowing a pressurized gas into the pressurized container 1 is connected to the bottom of the pressurized container 1. One end of the transport pipe 5 is inserted into the pressurized container 1 so as to reach the bottom, and the other end of the transport pipe 5 extends to the outside through the wall of the pressurized container 1.

A transport branch pipe 7 joins a portion of the transport pipe 5 extending from the wall of the pressurized container 1 to the outside, and a transport gas pressure regulating valve 8 is interposed in the transport branch pipe 7 and the transport branch pipe 7 is interposed. A pressure transmitter 9 for detecting the pressure of the transport gas flowing in the transport branch pipe 7 is attached. The transport gas pressure regulating valve 8 controls its opening so that the detected pressure value from the pressure transmitter 9 becomes a preset set pressure.
As a result, a transport gas flow having a predetermined pressure is formed in the transport pipe 5.

A pressurized gas pressure regulating valve 10 is interposed in the blow-in pipe 4, and a pressure transmitter (gas pressure detecting means) 11 for detecting the pressure in the pressurized container 1 is provided in the pressurized container 1. Is attached. The pressurized gas pressure regulating valve 10 is opened so that the detected pressure value from the pressure transmitter 11 becomes a preset pressure set so as to keep the difference between the pressure of the transport gas flowing through the transport branch pipe 7 and the transport gas pressure constant. The degree is controlled.
By blowing a pressurized gas into the pressurized container 1 from the blowing pipe 4, the granular material 2 pressed by the pressurized gas flow is transported to the outside via the transport pipe 5. .

Here, in this embodiment, the pressurized container 1
A plurality of nozzle devices (gas ejection means) 12 for ejecting gas into the pressurized container 1 are attached to the side wall of the pressure vessel 1. A gas supply pipe 13 is connected to the nozzle device 12, and an on-off valve 15 that is controlled to open and close by a control device 14 is interposed in the gas supply pipe 13. The control device 14 detects that the granular material 2 remains in the pressurized container 1 by the granular material detection means 16, and detects the gas pressure in the pressurized container 1 detected by the pressure transmitter 11. When the pressure drops below a predetermined lower limit set value, it is determined that a blow-through (20 in the figure) has occurred, and the on-off valve 15 is intermittently controlled to be opened. A gas is injected into the inside of the container, and the particles 2 that have accumulated on the inner surface of the pressurized container 1 are blown off and dropped. The injection of the gas causes the pressurized container 1
When the internal pressure rises and the pressure reaches a predetermined upper limit set value, the on-off valve 15 is controlled to close and the nozzle device 1 is closed.
2 to stop the gas injection. At this time, the powder 2 has a normal shape as shown in FIG.

The granular material detecting means 16 is for detecting whether or not the granular material 2 remains in the pressurized container 1, and in this embodiment, from the start of the blowing of the granular material 2. The time t until the end of the blowing is grasped in advance, and until the timer means times up the time t, the powder 2
Is determined to remain, and after the time is up, the pressurized container 1
It is determined that the powder 2 does not remain in the inside.

Next, the operation of the apparatus for transporting granular material having such a configuration will be described together with the operation of the control device 14. First, the pressure in the pressurized container 1 is set to 294 kPa. In normal blowing, in order to make the differential pressure between the pressurized container 1 and the transport pipe 5 constant, the pressurized gas pressure regulating valve 10 is used. The pressure inside the pressurized container 1 is kept substantially constant. In this state, pressurized gas is blown into the pressurized container 1 from the blow-in pipe 4, and the granular material 2 pressurized by the pressurized gas flow is transported to the outside via the transport pipe 5.

During the transportation, if the powder or granules 2 in the pressurized container 1 adhere to the inner surface of the side wall of the pressurized container 1 in a mortar-like shape and “blow-through” occurs, the pressure in the pressurized container 1 rapidly decreases. (19.6 kPa) so that the granular material 2 cannot be transported. In this embodiment, in order to prevent this “blow-by” in advance, the lower limit set value by which the control device 14 determines that the “by-pass” is 196 kPa. Is set to

The granular material detecting means 16 detects that the granular material 2 remains in the pressurized container 1, and the gas pressure in the pressurized container 1 detected by the pressure transmitter 11. Is lower than the lower limit set value, the controller 1
Reference numeral 4 indicates that a "bypass" has occurred and intermittently controls the opening and closing of the on-off valve 15, whereby the gas is intermittently ejected from the nozzle device 12 into the pressurized container 1 and the inner surface of the side wall of the pressurized container 1 The powder 2 fixed in a mortar shape falls to the bottom.

At this time, the nozzle device 12 is provided in the pressurized container 1.
The pressure of the gas inside the pressurized container 1 is disturbed by the gas ejected from the tank and the gas pressure in the pressurized container 1 is disturbed. The valve 10 is preferably fixed at a predetermined opening. Pressurized container 1 by gas ejection from nozzle device 12
When the granular material 2 adhered to the inner surface of the side wall falls to the bottom, the dropped granular material 2 is pressed by the pressurized gas flow blown from the blowing pipe 4 and transported by the transport pipe 5. The pressure in the pressurized container 1 gradually rises and returns, and when the pressure reaches the upper limit set value, the control device 14 closes the on-off valve 15, whereby the gas injection from the nozzle device 12 is stopped. The normal blowing is resumed. Note that, in this embodiment, the upper limit set value is set to 343 kPa, which is slightly higher than the initial set value, in consideration of the pressure rise in the pressurized container 1 due to gas ejection from the nozzle device 12.

[0016]

As is apparent from the above description, according to the present invention, when "blow-through" is detected, the gas is injected from the inner wall of the pressurized container to blow off the retained powder and to drop. The effect is obtained that the particles can be transported stably and the transport efficiency of the particles can be improved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram for explaining a granular material transporting apparatus which is an example of an embodiment of the present invention.

FIG. 2 is an explanatory diagram for explaining a conventional method of transporting a granular material.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Pressurized container 2 ... Granular material 4 ... Blowing pipe (blowing means) 5 ... Transport pipe (transport path) 11 ... Pressure transmitter (gas pressure detecting means) 12 ... Nozzle device (gas ejection means) 14 ... Control device (Control means) 16: Granule detecting means 20: Granular shape at blow-through 21: Granular shape at normal time

Claims (2)

[Claims] 1. A method of transporting a granular material contained in a pressurized container, wherein the granular material is transported to the outside using a pressurized gas flow blown from the bottom of the pressurized container. The gas pressure in the pressurized container and the presence or absence of the granular material are monitored, and when the gas pressure falls to a predetermined value or less in a state where the granular material remains in the pressurized container, the pressurizing is performed. A method for transporting a granular material, wherein a gas is ejected from a side wall of a pressure vessel into the pressure vessel. 2. A pressurized container for accommodating the powder and granules, blowing means for blowing a pressurized gas from the bottom of the pressurized container into the pressurized container, and the powder and granules pressurized by the pressurized gas A transport device for transporting the powder to the outside, comprising: a gas pressure detecting means for detecting a gas pressure in the pressurized container; and whether the particulate material remains in the pressurized container. A particle detector for detecting whether or not the gas container is in a pressurized container; a gas ejecting unit for ejecting gas from the side wall of the pressurized container into the pressurized container; Is detected, and when the gas pressure detected by the gas pressure detecting means falls below a predetermined set value, the gas is discharged by the gas discharging means. Control means for controlling gas blowing means Location.