JP7379873B2 - gas conveyance device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a gas conveying device that can continuously convey granular materials such as coal, gypsum, wood flour, and grains through a pipe using a conveying gas.

There is a gas conveying device that continuously conveys granular materials such as coal, gypsum, wood flour, and grains within piping using a carrier gas such as air. A typical gas conveying device is provided with a conduit connecting a powder supply tank and a storage tank, and the conduit is equipped with a pressure-feeding type or suction type air supply source. If this gas conveying device continues to operate for a long period of time, the contact portion between the powder and the inner surface of the tube may wear out, causing a problem that holes may form. For this reason, various wear countermeasures have been proposed in the past. For example, reducing the conveyance speed of powder or granular material to reduce the impact upon collision, applying wear-resistant lining to the contact area on the inner surface of the tube (disclosed in Patent Document 1), or Measures were taken to prevent wear through self-lining, which was intentionally retained inside the tube.

In addition, the wear suppression device disclosed in Patent Document 2 reduces the collision energy of the powder and granules colliding with the worn part by colliding introduced particles with the powder and granular material upstream of the worn part of the piping, thereby suppressing wear. are doing.
Further, the technique disclosed in Patent Document 3 provides an impeller within the pipe to prevent the accumulation of powder inside the pipe. The technique of Patent Document 4 eliminates blockage and pulsation in the middle of the pipe by providing a plurality of spiral convex shapes and spiral blades protruding toward the center on the pipe surface.
However, when the conveyance speed is lowered, the amount of powder particles deposited increases from the lowered part, the effective passage cross-sectional area of the pipe decreases, the speed increases, and the inner surface of the pipe other than the part where the transport speed is reduced is worn out. It will increase. In addition, due to the decrease in speed, the mixing ratio of the powder and the carrier gas increases, and the powder remains in the horizontal portion of the pipe, and after the transport pressure increases, the pipe becomes blocked and transport becomes impossible.

In addition, in order to form self-lining, the transport speed of the powder and the mixing ratio of the powder must be appropriately controlled, but it is difficult to maintain a constant supply amount of the powder in an actual machine. As a result, the flow velocity in the pipe increases as the mixing ratio changes (the passage area decreases due to blockage of the powder and the velocity increases), and the amount of wear other than the deposited portion increases. According to Patent Document 2, the device becomes complicated and the cost increases, and foreign matter may be mixed into the powder or granular material. Further, according to Patent Document 3, since wings are provided in the cross-sectional direction of the pipe, the powder particles decelerate and accumulate after passing through. In the case of electrically driven blades, it is difficult to set the optimum rotational speed. If the tube is not allowed to pass through the blades at the same flow rate within the tube, the powder will be repelled and cannot pass through, resulting in a classifier. Furthermore, according to Patent Document 4, swirling flow occurs because the central part of the pipe in the cross-sectional direction is open, but if the flow accumulates due to changes in the mixing ratio or flow velocity, the accumulation becomes a starting point and the volume increases. Put it away.
In this way, when taking measures against wear, it is difficult to maintain a constant conveyance amount of powder or granular material, or in other words, the mixing ratio with the carrier gas, and operation that satisfies both the reduction in speed and the stagnation of powder and granular material is required. ing.

Japanese Patent Application Publication No. 2007-112568 Japanese Patent Application Publication No. 2012-197919 Japanese Patent Application Publication No. 10-17146 Japanese Patent Application Publication No. 10-17147

The problem to be solved by the present invention is to provide a gas that can efficiently prevent retention in a pipe line and local wear of the pipe line when transporting powder or granular material using a carrier gas, in view of the problems of the prior art described above. The purpose of the present invention is to provide a conveyance device.

As a first means for solving the above-mentioned problems, the present invention provides a gas conveying device that continuously conveys powder and granular material through a pipe using a conveying gas.
A blade for changing a part of the airflow is provided in the pipe, and the blade can change the main surface from a state where the main surface is arranged along the airflow to an arbitrary angle with respect to the airflow,
a drive unit that changes the wing plate to an arbitrary angle;
a first pressure gauge that measures the pressure on the upstream side of the blade; a second pressure gauge that measures the pressure downstream of the blade; and a first pressure gauge that measures the pressure on the downstream side of the blade; comprising a control unit capable of transmitting a control signal to the driving unit to drive the blade at an arbitrary angle based on the differential pressure between the measured values of the pressure gauge,
The control unit is electrically connected to the fan and transmits a control signal to the fan to increase the air volume when the differential pressure is not eliminated after a set time has elapsed from the start of conveyance of the powder or granular material. The object of the present invention is to provide a gas conveying device that does the following.
According to the first means, it is possible to generate a swirling flow with low resistance to passage through the pipe, so that powder and granules do not always stay or collide in the same place, and it is possible to prevent stagnation and local wear of powder and granules. . In addition, when the main surface of the blade is arranged along the airflow, collisions with the powder or granular material can be reduced, and the powder or granular material can flow smoothly without becoming an obstacle during passage.
In addition, by detecting stagnation caused by changes in the mixing ratio and conveyance speed of powder and granules and changing the inclination of the blades, a swirling flow with little resistance to passage through the pipe is quickly generated, allowing the stagnation of powder and granules to occur. This can prevent local wear.
Furthermore, by increasing the air volume, the accumulation of powder particles that cannot be eliminated by changing the angle of the blades can be effectively eliminated.

According to the present invention, a swirling flow with low pipe passage resistance is generated without using a self-lining method, and stagnation and local wear do not occur inside the pipe.

1 is a schematic configuration diagram of a gas conveying device of the present invention. It is an explanatory view of the wing board in a conduit. It is an explanatory view of a gas conveyance device provided in a straight pipe. It is an explanatory view of a gas conveyance device provided in a bent pipe.

Embodiments of the gas conveying device of the present invention will be described in detail below with reference to the drawings.

[Gas conveyance device 10]
FIG. 1 is a schematic diagram of the configuration of a gas conveying device according to the present invention. FIG. 2 is an explanatory diagram of the blades in the conduit. FIG. 3 is an explanatory diagram of a gas conveying device provided in a straight pipe. FIG. 4 is an explanatory diagram of a gas conveying device provided in a bent pipe.
As shown in the figure, the gas conveying device 10 of the present invention is a device that is attached to a pipe (also referred to as piping) 12 that transports granular materials such as coal, gypsum, wood flour, and grains using a carrier gas. It has a blade 20 that partially changes the main surface of the blade 20, and a drive unit 30 that changes the main surface of the blade 20 from a state where it is arranged along the airflow to an arbitrary angle with respect to the airflow to generate a swirling flow. There is.

(Feather board 20)
The wing plate 20 is a flat plate that is substantially rectangular in plan view, and the lateral length (the side perpendicular to the airflow of the pipe line 12) is set to be smaller than the radial length of the pipe line 12. The material for the blades 20 is a steel material that has a predetermined rigidity and abrasion resistance that can withstand collisions with various types of powder and granular materials. The wing plate 20 of this embodiment is within the range of 0 degrees to 90 degrees when the bottom surface is 0 degrees and the horizontal line passing through the center is 90 degrees with respect to the vertical line passing through the center in a cross-sectional view of the conduit 12. (At 45 degrees in FIG. 2), a pair of left and right holes are provided with the bottom surface as the center. The main surface of the wing board 20 is arranged along a radial line centered on the pipe line 12, in other words, along the radial direction, and is attached so as to protrude from the road surface toward the center. The wing plate 20 can generate a swirling flow by changing the main surface from a state in which the main surface is disposed along the airflow to an arbitrary angle with respect to the airflow by a drive unit 30 described later.
The slats 20 can be used at predetermined locations in the pipe 12, such as locations where powder and granular materials are likely to accumulate, bent locations of bent pipes (see Fig. 4), upstream of locations where wear is likely to occur, and other areas where powder and granular materials are likely to accumulate. It is best to install them at intervals.

(Drive part 30)
The drive unit 30 is provided outside the conduit 12 with the conduit 12 sandwiched between the blade 20 and the conduit 12 within the conduit 12 . The drive unit 30 includes a shaft 32 and a rotary motor (a geared motor is used as an example, not shown) that can rotate the shaft 32 around an axis. The shaft 32 is inserted into a through hole provided on the surface of the conduit 12 from the outside toward the inside and configured to be rotatable, and the rotary motor is fixed outside the conduit 12. A wing plate 20 is connected to the tip of the shaft 32 within the conduit 12. With such a configuration of the blade 20 and the drive unit 30, the blade 20 can freely rotate around the axis of the shaft 32, and in the initial stage of operation, the main surface is arranged along the airflow in the pipe 12 (the blade 20 The horizontal direction of the airflow is perpendicular to the airflow (see the solid line in FIGS. 1 and 2). Thereafter, the drive unit 30 rotates the shaft 32 to change the main surface to an arbitrary angle with respect to the airflow (see the dashed line in FIG. 2).

(Control unit 40)
The control unit 40 is electrically connected to the drive unit 30 , the timer 42 , first and second pressure gauges 50 and 52 , and a blower fan 60 that generates airflow within the pipe line 12 . The control unit 40 is configured to be able to transmit a control signal for changing the main surface of the wing plate 20 to an arbitrary angle to the drive unit 30.
The triggering of the control signal by the control unit 40 is based on the measured values of the timer 42 and the first and second pressure gauges 50 and 52. The timer 42 is configured to be able to transmit a progress signal (one or more times) to the control unit 40 after a predetermined period of time has elapsed from the start of operation (the start of transport of the powder or granular material). The first pressure gauge 50 is attached to the upstream side of the wing plate 20 installed in the pipe line 12, and is configured to be able to measure the pressure inside the pipe and transmit the measured value to the control unit 40. The second pressure gauge 52 is attached to the downstream side of the wing plate 20 installed in the pipe line 12, and is configured to be able to measure the pressure inside the pipe and transmit the measured value to the control unit 40.
Further, when giving a control signal to the drive unit 30 of the plurality of vanes 20, the control unit 40 alternately generates a clockwise rotation and a counterclockwise rotational swirl flow in the pipe, thereby making the accumulation of powder particles uneven. It can also be configured to eliminate this problem.

[Example 1]
Timer control of the gas conveying device 10 of the present invention having the above configuration will be explained below. At the beginning of the granular material, the main surfaces of the blades 20 in the pipe line 12 are arranged along the airflow. Thereby, contact with the granular material flowing in the airflow occurs only in the lateral direction of the wing plate 20, and resistance can be reduced.
The timer 42 starts measuring from the start of conveyance of the powder and granules, and transmits a progress signal to the control unit 40 one or more times after a predetermined period of time has elapsed.
When the control unit 40 receives the progress signal from the timer 42, it transmits a control signal to change the angle to an arbitrary angle to the drive unit 30, and sets the main surface of the blade 20 in the conduit 12 at an arbitrary angle with respect to the airflow. It can be placed in As an example, if stagnation occurs behind the blades 20 due to changes in the mixing ratio of powder or granular material or the conveyance speed, the upstream sides of the pair of blades 20 in the pipe line 12 are separated from each other, and the downstream sides are separated from each other. By bringing them close together, it is possible to generate a swirling flow toward the stagnation behind. This swirling flow can blow away the stagnation.
Note that the arbitrary angle of the blade 20 can be changed not only once, but also periodically (in stages) to prevent stagnation in the same location and prevent the powder from colliding with the same location. Road wear can be avoided.

[Example 2]
The differential pressure control of the gas conveying device 10 of the present invention having the above configuration will be explained below. At the beginning of the granular material, the main surfaces of the blades 20 in the pipe line 12 are arranged along the airflow. Thereby, contact with the granular material flowing in the airflow occurs only in the lateral direction of the wing plate 20, and resistance can be reduced.
The first and second differential pressure gauges 50 and 52 start measuring from the start of conveyance of the granular material, and periodically transmit measurement signals of the pressure within the pipe line 12 to the control unit 40.
Upon receiving the measurement signals from the first and second pressure gauges 50 and 52, the control unit 40 calculates the differential pressure between the respective pressure measurement values of the first and second pressure gauges. Then, a pressure difference is set in advance when the powder or granular material accumulates or the conveyance speed becomes low, and when the set pressure difference is exceeded, the angle is changed to an arbitrary angle with respect to the drive unit 30. By transmitting a control signal, the main surface of the blade 20 in the conduit 12 can be placed at an arbitrary angle with respect to the airflow. As an example, if stagnation occurs behind the blades 20 due to changes in the mixing ratio of powder or granular material or the conveyance speed, the upstream sides of the pair of blades 20 in the pipe line 12 are separated from each other, and the downstream sides are separated from each other. By bringing them close together, it is possible to generate a swirling flow toward the stagnation behind. This swirling flow can blow away the stagnation.

Further, in conjunction with a timer 42, a preset driving time is measured. When the differential pressure calculated from the measured values by the first and second pressure gauges 50 and 52 does not disappear after the set time has elapsed (when the differential pressure does not fall below the set differential pressure), the controller 40 sends the blower fan 60 sends a control signal to increase the air volume. This makes it possible to eliminate the differential pressure caused by the stagnation of particulate matter in the pipe line 12.
According to the gas conveying device 10 of the present invention, a swirling flow with low passage resistance through the pipe is generated, so that powder and granules do not always stay in the same place or collide with each other, and the stagnation and stagnation of powder and granules are prevented. Local wear can be prevented. In addition, when the main surface of the blade is arranged along the airflow, collisions with the powder or granular material can be reduced, and the powder or granular material can flow smoothly without becoming an obstacle during passage.

The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.
Further, the present invention is not limited to the combinations shown in the embodiments, but can be implemented by various combinations.

The gas conveying device of the present invention has industrial applicability, particularly in the field of continuously conveying granular materials such as coal, gypsum, wood flour, and grains through a pipe using a carrier gas.

10 Gas conveying device 12 Pipe line 20 Wing plate 30 Drive section 32 Shaft 40 Control section 42 Timer 50 First pressure gauge 52 Second pressure gauge 60 Blow fan

Claims (1)

In a gas conveying device that continuously conveys powder and granular material inside a pipe using a carrier gas,
A blade for changing a part of the airflow is provided in the pipe, and the blade can change the main surface from a state where the main surface is arranged along the airflow to an arbitrary angle with respect to the airflow,
a drive unit that changes the wing plate to an arbitrary angle;
a first pressure gauge that measures the pressure on the upstream side of the blade; a second pressure gauge that measures the pressure downstream of the blade; and a first pressure gauge that measures the pressure on the downstream side of the blade; comprising a control unit capable of transmitting a control signal to the driving unit to drive the blade at an arbitrary angle based on the differential pressure between the measured values of the pressure gauge,
The control unit is electrically connected to the fan and transmits a control signal to the fan to increase the air volume when the differential pressure is not eliminated after a set time has elapsed from the start of conveyance of the powder or granular material. gas conveyance device.

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