JP3428408B2 - Powder shut-off valve device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder cutoff valve device in a lock hopper system for supplying powder such as a catalyst to a high pressure system that handles a gas body such as a chemical plant.

[0002]

2. Description of the Related Art An example of a lock hopper system is shown in FIG. This is because a powder flow pipe 2 is connected to a gas flow pipe 1 for flowing a gas in a high pressure state in the direction of arrow a, and a gas seal valve device 3 and a powder cutoff valve device 4 are connected to the powder flow pipe 2. Is provided so as to be doubly sealed, and the powder S (see FIG. 6) is placed in the powder flow pipe 2 in the direction of arrow b by opening both the devices 3 and 4. And is mixed with the gas body in the gas body flow pipe 1.

Conventionally, a sluice valve and a ball valve have been generally used as the powder shutoff valve device 4.
There is a drawback that the entire device becomes large. Therefore, FIG.
It is possible to use the butterfly valve 5 as shown in FIG. This is one in which a valve box 6 is concentrically interposed in the powder flow pipe 2 and a valve body 8 is openably and closably disposed in the valve box 6 via a valve rod 7. From the closed state (see the solid line in the figure) where the outer peripheral seat portion 8a of the above is brought into contact with the seat portion 6a of the valve box 6 to open the valve body 8 by rotating the valve rod 7 (see the virtual line in the figure). By doing so, the powder S supplied into the powder flow pipe 2 is fed into the gas body flow pipe 1.

[0004]

SUMMARY OF THE INVENTION In the above conventional configuration,
Although the butterfly valve 5 can be incorporated in the powder flow pipe 2 to downsize the entire apparatus, the butterfly valve 5 is simply interposed in the powder flow pipe 2 and deposited on the valve body 8. Since the weight of the powder S formed is applied to the valve body 8,
When rotating the valve rod 7 to change the valve body 8 from the closed state to the open state, it is necessary to scrape up the powder S accumulated on the valve body 8, and therefore the operation torque becomes excessive. As a drive source for rotating the valve rod 7, a large drive source having a large drive force is required, and the manufacturing cost is high.

In view of the above problems, it is an object of the present invention to provide a powder shutoff valve device which can easily open and close a butterfly valve with a small operating torque.

[0006]

In order to achieve the above-mentioned object, the invention according to claim 1 is a powder cutoff valve device in which a butterfly valve is interposed in a powder flow pipe, the butterfly valve and the butterfly valve. A short pipe is concentrically interposed between the powder flow pipe on the upstream side of the butterfly valve, and a plurality of nozzles are tangent to the inner peripheral face at predetermined intervals in the circumferential direction on the inner peripheral face of the short pipe. Are arranged in the upstream direction substantially along the direction, and a purge gas is injected from each of the nozzles into the short pipe to generate a swirling gas flow along the inner peripheral surface of the short pipe. .

According to the above construction, since the plurality of nozzles are arranged on the inner peripheral surface of the short pipe at a predetermined interval in the circumferential direction in the upstream direction substantially along the tangential direction of the inner peripheral surface, the butterfly valve is provided. When the valve body is opened from the closed state to the open state, a purge gas is injected from each of the nozzles to generate a swirling gas flow along the inner peripheral surface of the short pipe, and powder is placed on the swirling gas flow and blown up. As a result, the weight of the powder on the valve body can be reduced, which allows the butterfly valve to be easily opened and closed with a small operating torque.

According to a second aspect of the present invention, there is provided a powder cutoff valve device in which a butterfly valve is interposed in the powder flow pipe, wherein the powder cutoff valve device is provided between the butterfly valve and the powder flow pipe upstream of the butterfly valve. A short pipe is concentrically interposed in the inner peripheral surface of the short pipe,
A plurality of nozzles are arrayed in the upstream direction substantially along the tangential direction of the inner peripheral surface at predetermined intervals in the circumferential direction and the axial direction, and the purge gas is injected from each of the nozzles into the short pipe to generate the short gas. It is characterized in that a swirling gas flow is generated along the inner peripheral surface of the pipe.

According to the above construction, not only the plurality of nozzles are arranged along the circumferential direction as in the first aspect of the invention, but also the plurality of nozzles are arranged along the axial direction. When the valve is changed from the closed state to the open state, the swirling gas flow is surely generated on the entire inner peripheral surface of the short pipe by the purge gas injected from each of the nozzles, and the swirling gas flow is loaded with powder to blow it up. The weight of the powder applied to the valve body can be remarkably reduced, whereby the butterfly valve can be easily opened and closed with a smaller operating torque.

A third aspect of the present invention is a powder shutoff valve device in which a butterfly valve is interposed in a powder flow pipe, wherein the powder shutoff valve device is provided between the butterfly valve and the powder flow pipe upstream of the butterfly valve. A short pipe is concentrically interposed in the inner peripheral surface of the short pipe,
A plurality of nozzles are arranged upstream in the radial direction at predetermined intervals in the circumferential direction, and a purge gas is injected from each nozzle into the short pipe to generate a gas flow along the inner peripheral surface of the short pipe. The feature is that it is generated.

According to the above construction, since the plurality of nozzles are arranged on the inner peripheral surface of the short pipe at predetermined intervals in the circumferential direction in the radial direction in the upstream direction, the butterfly valve is opened from the closed state. When, to generate a gas flow along the inner peripheral surface of the short pipe by injecting a purge gas from each nozzle,
By weighting the powder on the gas flow and blowing it up, the weight of the powder applied to the valve body can be reduced, and thus the butterfly valve can be easily opened and closed with a small operating torque.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a powder cutoff valve device 4 according to an embodiment of the present invention, which includes a butterfly valve 5 interposed in a powder flow pipe 2 and an upstream side of the butterfly valve 5. A short pipe 10 is concentrically provided between the powder flow pipe 2 and the powder flow pipe 2, and the powder flow pipe 2 and the valve box 6 are provided in the short pipe 10.
A cylindrical plate 11 having substantially the same inner diameter as that of FIG.
By bonding a and 11b to the upper and lower ends of the short pipe 10,
A cylindrical hermetically sealed space 12 is formed along the inner peripheral surface of the short pipe 10, and the cylindrical plate 11 has a predetermined space α. A plurality of nozzles 13 are arranged at an angle of β at a predetermined inclination angle θ in the upstream direction substantially along the tangential direction of the cylindrical plate 11, and a purge gas supply with an opening / closing valve 14 communicating with each nozzle 13 via the closed space 12 is provided. The pipe 15 is fixed to the short pipe 10. Since the butterfly valve 5 has almost the same structure as that shown in FIG. 6, the same parts are designated by the same reference numerals and the description thereof will be omitted.

In the above structure, when the valve body 8 of the butterfly valve 5 is changed from the closed state (see the solid line in FIG. 1) to the open state (see the phantom line in FIG. 1), the opening / closing valve 14 is opened to remove the purge gas supply pipe 15 from the cylinder. A purge gas is supplied into the closed space 12, and the purge gas is injected from each nozzle 13 to generate a swirling gas flow A along the inner peripheral surface of the cylindrical plate 11. In this case, not only the plurality of nozzles 13 are arranged at predetermined intervals α along the circumferential direction, but also the plurality of nozzles 13 are arranged at predetermined intervals β also along the axial direction. The swirling gas flow A can be reliably generated on the entire inner peripheral surface of the cylindrical plate 11 by the injected purge gas, and the powder S is applied to the swirling gas flow A and blown up, whereby the powder S applied to the valve body 8 is blown. The weight of the butterfly valve 5 can be reduced, so that the butterfly valve 5 can be easily opened and closed with a small operating torque.

In the above-described embodiment, the nozzles 13 are arranged in three stages at a predetermined interval β in the axial direction, but the invention is not limited to this, and each nozzle 13 may be arranged in one stage or two stages.
The step comb may be arranged in four or more steps.

Further, although the nozzles 13 are arranged on the cylindrical plate 11 arranged in the short pipe 10, the present invention is not limited to this, and the cylindrical plate 11 is omitted, and each nozzle 13 is replaced by the short pipe 1.
They may be arranged along the inner peripheral surface of 0. In addition, each nozzle 1
Although the nozzles 3 are arranged almost along the tangential direction of the cylindrical plate 11, the nozzles 13 are not limited to this, and the nozzles 13 may be arranged along the radial direction of the short pipe 10.

3 and 4 show a powder cutoff valve device 4 according to another embodiment of the present invention, in which an annular distribution pipe 17 is arranged outside the short pipe 10, and the annular distribution pipe is arranged. A plurality of nozzles 13 are connected to 17 at a predetermined interval α in the circumferential direction, and each nozzle 13 extends in the upstream direction at a predetermined inclination angle θ along the radial direction to penetrate the short pipe 10. The tip of each nozzle 13 is exposed inside the short tube 10. Since the configuration other than the above is almost the same as that of the embodiment shown in FIGS. 1 and 2, the same parts are designated by the same reference numerals and the description thereof will be omitted.

According to the above structure, the butterfly valve 5 is closed (see the solid line in FIG. 3) to open (see the phantom line in FIG. 3).
At the time of, the purge gas is jetted from each nozzle 13 to generate a cylindrical gas flow B along the inner peripheral surface of the short pipe 10, and the powder S is placed on the gas flow B and blown up, so that the valve The weight of the powder S applied to the body 8 can be reduced, which allows the butterfly valve 5 to be easily opened and closed with a small operating torque.

[0018]

According to the first aspect of the present invention, a plurality of nozzles are arranged on the inner peripheral surface of the short pipe at predetermined intervals in the peripheral direction in the upstream direction substantially along the tangential direction of the inner peripheral surface. Therefore, when the valve body of the butterfly valve is changed from the closed state to the open state, a purge gas is injected from each of the nozzles to generate a swirling gas flow along the inner peripheral surface of the short pipe, and the swirling gas flow is generated. The weight of the powder applied to the valve body can be reduced by loading and blowing up the powder, which allows the butterfly valve to be easily opened and closed with a small operating torque.

According to the invention described in claim 2, not only the plurality of nozzles are arranged along the circumferential direction as in the invention according to claim 1, but also the plurality of nozzles are arranged along the axial direction. Therefore, when the butterfly valve is changed from the closed state to the open state, the swirling gas flow is surely generated on the entire inner peripheral surface of the short pipe by the purge gas injected from each nozzle, and the powder is placed on the swirling gas flow. By blowing it up, the weight of the powder applied to the valve body can be remarkably reduced, which allows the butterfly valve to be easily opened and closed with a smaller operating torque.

According to the third aspect of the invention, the plurality of nozzles are arranged on the inner peripheral surface of the short pipe at predetermined intervals in the circumferential direction in the radial direction, so that the butterfly valve is closed. When the state is released, the purge gas is injected from each nozzle to generate a gas flow along the inner peripheral surface of the short pipe, and powder is placed on the gas flow and blown up so that the valve element is applied. The weight of the powder can be reduced, which allows the butterfly valve to be easily opened and closed with a small operating torque.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a powder cutoff valve device according to an embodiment of the present invention.

FIG. 2 is a transverse sectional view of the same.

FIG. 3 is a vertical sectional view of a powder cutoff valve device according to another embodiment of the present invention.

FIG. 4 is a transverse sectional view of the same.

FIG. 5 is a circuit diagram showing an example of a lock hopper system.

FIG. 6 is a vertical sectional view showing a conventional example.

[Explanation of symbols]

2 Powder distribution pipe 4 Powder shutoff valve device 5 butterfly valve 10 Short tube 13 nozzles S powder

Claims (3)

(57) [Claims] 1. A powder cutoff valve device in which a butterfly valve is interposed in a powder flow pipe, wherein a short pipe is concentric between the butterfly valve and the powder flow pipe upstream of the butterfly valve. A plurality of nozzles are arranged on the inner peripheral surface of the short pipe at predetermined intervals in the circumferential direction in an upstream direction substantially along the tangential direction of the inner peripheral surface. A powder cutoff valve device characterized in that a swirling gas flow is generated along the inner peripheral surface of the short pipe by injecting a purge gas into the pipe. 2. A powder cutoff valve device in which a butterfly valve is interposed in a powder flow pipe, wherein a short pipe is concentric between the butterfly valve and the powder flow pipe upstream of the butterfly valve. A plurality of nozzles are arranged on the inner peripheral surface of the short pipe at predetermined intervals in the circumferential direction and the axial direction in the upstream direction substantially along the tangential direction of the inner peripheral surface. A powder cutoff valve device characterized in that a purge gas is injected from each nozzle into the short pipe to generate a swirling gas flow along the inner peripheral surface of the short pipe. 3. A powder cutoff valve device in which a butterfly valve is interposed in a powder flow pipe, wherein a short pipe is concentric between the butterfly valve and the powder flow pipe upstream of the butterfly valve. , A plurality of nozzles are arranged on the inner peripheral surface of the short pipe at predetermined intervals in the circumferential direction in the upstream direction along the radial direction, and each nozzle injects a purge gas into the short pipe. The powder cutoff valve device is characterized in that a gas flow is generated along the inner peripheral surface of the short pipe.