JPH11210897A - Rotary valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To continuously feed powder by the use of a rotary valve in which a rotor provided with spiral rotor blades is rotatably arranged in a casing formed with a feeding port for the powder. SOLUTION: A rotor 3 is rotated by a driving device 5. Powder 7 stored in a hopper 8 is fed from an opening 9 of the hopper 8 to a piping 11 through an application port 6 of a casing 2 and a feeding port 10 of the casing 2. The ponder is then fed to a boiler, etc. In such a rotary valve 1, rotor blades 4 are spirally arranged on th rotor 3. The rotor blades 4 are arranged on the outer periphery of the rotor 3, by for instnce eight, with an angle of 45 degrees in every pitch. Each rotor blade 4 has so twisted that its phase is dislocated from one end to the other in an axial direction by twisting angle θof 112.5 degrees (45 degrees × 2.5). The powder 7 can be continuously fed therefore.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a rotary valve.

[0002]

2. Description of the Related Art Generally, a rotary valve is used to cut out a predetermined amount of powder from a hopper in which powder such as pulverized coal is stored and supply the cut powder to equipment such as a boiler or a reactor.

FIGS. 7 to 9 show an example of a conventional rotary valve. In the drawings, reference numeral 1 denotes a rotary valve;
Is a horizontal cylindrical casing of the rotary valve 1, 3 is a rotor rotatably disposed concentrically within the casing 2, and 4 is a plurality of radially mounted outer circumferences of the rotor 3 (in the example of the figure, And eight driving blades 5 such as a motor for rotating the rotor 3.
An inlet 6 formed in the upper part of the casing 2 is connected to an opening 9 at the bottom of a hopper 8 in which powder 7 such as pulverized coal is stored, while a cutout 10 formed in a lower part of the casing 2. Is connected to a pipe 11 that is connected to equipment such as a boiler and a reactor (not shown).

In the rotary valve 1 as described above,
When the rotor 3 is rotated at a predetermined speed by the driving device 5, the powder 7 stored in the hopper 8 is discharged from the opening 9 of the hopper 8 through the input port 6 of the casing 2 to the one between the adjacent rotor blades 4. The powder 7 that has fallen sequentially into the region and has fallen sequentially into one region between the adjacent rotor blades 4 is
It moves downward with the rotation of the rotor 3, is cut out from a cutout 10 of the casing 2 to a pipe 11, and is supplied to equipment such as a boiler and a reactor (not shown) by air conveyance or the like.

[0005]

However, in the case of the conventional rotary valve 1 as described above, as shown in FIGS. 7 to 9, each rotor blade 4 is oriented in a direction parallel to the axis of the rotor 3 with respect to the rotor 3. 10, the cutting amount of the powder 7 with respect to the elapsed time is as shown in FIG.
, The cutting of the powder 7 is intermittent, the combustion in the boiler to which the powder 7 is supplied and the reaction in the reactor may become unstable, and the downstream equipment There is a possibility that the performance of the device may decrease.

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention is capable of cutting powder continuously, not intermittently, and improving the performance of equipment such as a boiler and a reactor to which powder is supplied. It is intended to provide a valve.

[0007]

According to the present invention, a plurality of rotor blades are provided radially in a horizontal cylindrical casing having a powder inlet formed at an upper portion and a powder cutout formed at a lower portion. A rotary valve having a rotor attached to the casing rotatably disposed so as to be concentric with the casing, wherein a rotor blade is spirally disposed with respect to the rotor. It is.

In the rotary valve, the cutout formed in the lower portion of the casing can be shifted forward in the rotation direction of the rotor from a vertical line passing through the axis of the rotor.

According to the above means, the following effects can be obtained.

When the rotor is rotated at a predetermined speed, the powder charged into the casing through the charging port sequentially falls into the region between the adjacent rotor blades, and sequentially falls into the region between the adjacent rotor blades. The powder is moved downward with the rotation of the rotor, cut out from the cutout of the casing, and supplied to equipment such as a boiler and a reactor by air conveyance or the like. In a state where a part of one region between the two rotor blades is located at the cutout, a plurality of regions adjacent to the region with the rotor blades therebetween are arranged in a spiral shape. Is partially located at the cutout.

As a result, the cutting of the powder is performed not intermittently but continuously, so that the combustion in the boiler to which the powder is supplied and the reaction in the reactor are prevented from becoming unstable, and the downstream side is prevented from becoming unstable. The performance of the device does not decrease.

In the rotary valve, when the cutout formed at the lower portion of the casing is shifted forward in the rotation direction of the rotor from a vertical line passing through the axis of the rotor, the lower end edge of the casing has a gentle inclination angle and is nearly horizontal. Has become
When the powder begins to fall from the lower edge of the casing to the cutout, the portion of the powder below the angle of repose does not fall, but the powder falls by being pushed by the rotating rotor blade, and as a result, The powder is cut out intermittently, not intermittently.Moreover, the curve of the amount of powder cut out at the beginning and end of dropping to the cutout becomes slightly gentle, and the boiler to which the powder is supplied Instability of combustion in the reactor and instability of the reaction in the reactor are more reliably avoided, and the performance of downstream equipment is not reduced.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 show an example of an embodiment of the present invention. In the drawings, portions denoted by the same reference numerals as those in FIGS. 7 to 9 represent the same components. This embodiment is the same as the conventional one shown in FIGS. 7 to 9, but is characterized in that a rotor blade 4 is spirally disposed on the rotor 3 as shown in FIGS. 1 to 3. It is in.

In the illustrated example, the rotor blade 4
Are arranged on the outer periphery of the rotor 3 at an angle of 45 ° per pitch, that is, the rotor blades 4 are moved from one end side in the axial direction of the rotor 3 to the other end side. 5
Pitch, ie 45 ° × 2.5 = 112.5 ° torsion angle θ
Twisted so as to be out of phase by an amount, so that a part of one area between the two rotor blades 4
In a state where the area is located at 0, a plurality of areas adjacent to the area across the rotor blade 4 are partially located at the cutout 10.

It is needless to say that the twist angle θ of the rotor blade 4 may be increased or decreased as needed. However, if the twist angle θ of the rotor blades 4 is too large, one region between the two rotor blades 4 may be connected to both the inlet 6 and the cutout 10 at the same time. The torsion angle θ of the rotor blade 4 is set within a range where such a situation does not occur.

Next, the operation of the illustrated example will be described.

When the rotor 3 is rotated at a predetermined speed by the driving device 5, the powder 7 stored in the hopper 8 is transferred from the opening 9 of the hopper 8 to the adjacent rotor blade 4 through the input port 6 of the casing 2. The powder 7 that has fallen sequentially into the region between the adjacent rotor blades 4 and has moved sequentially downward with the rotation of the rotor 3, is cut out from the cutout 10 of the casing 2 to the pipe 11. The rotor blades 4 are supplied to equipment such as a boiler and a reactor (not shown) by air conveyance or the like. In a state where a part of one region is located at the cutout 10, a plurality of regions adjacent to the region with the rotor blade 4 interposed therebetween are partially located at the cutout 10.

As a result, the cutting amount of the powder 7 with respect to the elapsed time is as shown in FIG. 4, and the cutting of the powder 7 is performed not intermittently but continuously, and the boiler to which the powder 7 is supplied is provided. The combustion in the reactor and the reaction in the reactor are prevented from becoming unstable, and the performance of downstream equipment does not decrease.

In FIG. 4, the solid line indicates the total amount of the powder 7 cut out from the cutout 10, and the two-dot chain line indicates the amount of cutout from each region between the two rotor blades 4. The hatched portion indicates the amount cut out from one region.

In this way, the powder 7 can be cut out continuously, not intermittently, and the performance of equipment such as a boiler and a reactor to which the powder 7 is supplied can be improved.

FIG. 5 shows another example of the embodiment of the present invention. In the figure, the portions denoted by the same reference numerals as those in FIGS. The cutout 10 to be cut is shifted forward from the vertical line L passing through the axis of the rotor 3 in the rotation direction of the rotor 3.

In the example shown in FIG. 5, the lower end edge portion of the casing 2 has a gentle inclination angle because the cutout 10 is shifted forward from the vertical line L passing through the axis of the rotor 3 in the rotation direction of the rotor 3. When the powder 7 begins to fall from the lower edge of the casing 2 to the cutout 10, the portion of the powder 7 below the angle of repose does not fall and is pressed by the rotating rotor blade 4. This causes the powder 7 to fall.

As a result, the cutting amount of the powder 7 with respect to the elapsed time is as shown in FIG. 6, and the cutting of the powder 7 is performed not intermittently but continuously. 10
The curve of the cut-out amount at the beginning and end of falling to becomes slightly gentle, and the combustion in the boiler to which the powder 7 is supplied and the reaction in the reactor are more reliably prevented from becoming unstable, The performance of downstream equipment does not decrease.

In FIG. 6, the solid line indicates the total amount of powder 7 cut out from the cutout 10, and the two-dot chain line indicates the amount of cutout from each region between the two rotor blades 4. The hatched portion indicates the amount cut out from one region.

Thus, in the case of the example shown in FIG.
3, the cutting of the powder 7 can be performed not intermittently but continuously, and the performance of equipment such as a boiler or a reactor to which the powder 7 is supplied can be improved.

It should be noted that the rotary valve of the present invention is not limited to the illustrated example described above, and it is needless to say that various changes can be made without departing from the gist of the present invention.

[0028]

As described above, according to the rotary valve of the present invention, the powder can be cut out continuously, not intermittently, and the equipment such as a boiler or a reactor to which the powder is supplied is provided. There is an excellent effect that the performance of the device can be improved.

[Brief description of the drawings]

FIG. 1 is a front sectional view of an example of an embodiment of the present invention.

FIG. 2 is a side sectional view of an example of an embodiment of the present invention, and is a view corresponding to a cross section taken along line II-II of FIG.

FIG. 3 is a perspective view of a rotor blade according to an example of an embodiment of the present invention.

FIG. 4 is a diagram illustrating a relationship between an elapsed time and a cut-out amount of powder in an example of an embodiment of the present invention.

FIG. 5 is a front sectional view of another example of the embodiment of the present invention.

FIG. 6 is a diagram illustrating a relationship between an elapsed time and a cut-out amount of powder in another example of an embodiment of the present invention.

FIG. 7 is a front sectional view of a conventional example.

FIG. 8 is a side sectional view of a conventional example, taken along line VIII- of FIG.
It is a figure equivalent to the VIII direction arrow cross section.

FIG. 9 is a perspective view of a rotor blade in a conventional example.

FIG. 10 is a diagram showing a relationship between an elapsed time and a cut-out amount of powder in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotary valve 2 Casing 3 Rotor 4 Rotor blade 6 Input port 7 Powder 10 Cut-out port L Vertical line

Claims (2)

[Claims] 1. A rotor in which a plurality of rotor blades are radially mounted in a horizontal cylindrical casing having a powder inlet formed at an upper part and a powder cutout formed at a lower part. A rotary valve, which is rotatably disposed so as to be concentric, wherein a rotor blade is spirally disposed on the rotor. 2. The rotary valve according to claim 1, wherein a cutout formed in a lower portion of the casing is shifted forward in a rotational direction of the rotor from a vertical line passing through an axis of the rotor.