JPH1057718A - Strainer device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the rotation of a blade from being obstructed by coarse grains stuck to bend or break the blade in a strainer device for removing coarse grains contained coal slurry which is a mixture of coal fine powder and liquid such as heavy oil and water by reducing coarse grains being stuck and deposited on the inner surface of a coarse grain collecting part. SOLUTION: When coal slurry is filtered by a strainer device, the removed coarse grains settle to a coarse grain collecting part 8 in the lower part of a casing 1, but an agitating blade 26 having such a shape that a spiral blade 8 is provided around a driving shaft 15 is rotated to generate convection in the up and down directions inside the coarse grain collecting part 8. In this way, the settled coarse grains being stuck and deposited on the inner surface of the coarse grain collecting part 8 is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a strainer which is provided on a transfer path of coal slurry fuel and is used for removing coarse particles of slurry.

[0002]

2. Description of the Related Art Coal utilization technologies have been developed which fluidize coal to enable storage in tanks, pipeline transportation, and combustion in boilers in the same manner as liquid fuel. This is fine coal powder,
Coal slurry fuel mixed with liquids such as water and heavy oil (C
WM, COM, etc.). And foreign matter and excessive particles in the coal slurry (hereinafter referred to as coarse particles)
In order to remove the water, a strainer device is interposed in the transfer path. The conventional strainer device has a structure shown in FIG.

First, as shown in the figure, a vertically extending cylindrical casing 51 supported by a base B is provided, and a substantially cylindrical filter element 52 is disposed inside the casing 51. A fluid inlet tube 53 is provided at an upper portion of the casing 51 so as to communicate with the inside of the filter element 52, and a fluid outlet tube 54 is provided at a lower portion of the casing 51. Filter element 5
An inverted conical coarse particle collection unit 55 is attached to the lower end of the second unit 2.
A coarse-grain return pipe 56 is provided at the lower end of the coarse-grain collection part 55 so as to communicate with the outside of the casing 51. The coarse grain return pipe 56 has a drain valve 57, and the handle 58 opens and closes the drain valve 57.

A motor 5 is provided above the casing 51.
9 and a speed reducer 60 are provided. The upper end of the drive shaft 61 is attached to the motor 59 via the speed reducer 60, and the drive shaft 61 is driven by the motor 59. The drive shaft 61 is connected to the casing 51
The filter element 52 extends through the center of the filter element 52 to the coarse particle collection section 55, and a stirring blade 62 is attached to the lower end thereof. The stirring blade 62 has two support rods 63, 6
4 is attached to the drive shaft 61 substantially orthogonally, and the support rods 63, 64
At both ends, a plurality of strip-shaped blades 65 and 66 are attached in an inclined state so as to be parallel to the inner surface of the coarse particle collection portion 55. A scraper 67 is attached to the drive shaft 61 inside the filter element 52, and the tip of the scraper 67 is in sliding contact with the inner surface of the filter element 52. This is to prevent the filter element 52 from being clogged.

In the above strainer device, when coal slurry is injected into the filter element 52 from the fluid inlet pipe 53, the coal slurry is
2, passes through the outer peripheral side in the casing 51, and flows out of the fluid outlet pipe 54 at the lower part of the casing 51 to the outside. Coarse particles that cannot pass through the filter element 52 remain inside the filter element 52. Further, with the rotation of the drive shaft 61 driven by the motor 59 via the speed reducer 60, the scraper 67 rotates to scrape coarse particles attached to the inner surface of the filter element 52. Then, these coarse particles gradually sink into the coarse particle collection section 55, and at appropriate time intervals, the drain valve 5
By opening 7, these are discharged to the outside. In order to prevent the settled coarse particles from adhering and accumulating on the inner surface of the coarse particle collection part 55, the stirring blade 62 attached to the lower end of the drive shaft 61 rotates to stir the coarse particles.

[0006]

In the above strainer device, the stirring blades 62 attached to the lower end of the drive shaft 61 in the coarse particle collection section 55 rotate to stir the coarse particles. However, coarse particles sinking inside the filter element 52 toward the coarse particle collecting portion 55 are stirred by the circumferential flow of the coarse particle collecting portion 55 generated by the rotation of the two blades 65 and 66. However, as a whole, there is a tendency to sink due to the action of gravity, so that attachment and accumulation of coarse particles on the inner surface of the coarse particle collection unit 55 cannot be avoided. Therefore, there is a problem that the rotation of the blades 65 and 66 is hindered by the attached and deposited coarse particles, and the blades 65 and 66 are bent or damaged in some cases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems. An object of the present invention is to reduce the adhesion and deposition of coarse particles and the like on the inner surface of a coarse particle collecting section, and to reduce the amount of coarse particles and the like. Accordingly, it is an object of the present invention to provide a strainer device that can prevent the blade from being bent or damaged due to hindrance of rotation of the blade, thereby improving service life and operational reliability.

[0008]

According to a first aspect of the present invention, there is provided a strainer device having a cylindrical filter element disposed in a casing and a lower cross-sectional area at the bottom of the filter element. A grain collection unit 8 is provided in series, and a coal slurry obtained by mixing pulverized coal and a liquid such as water is introduced into the filter element 2 and the coal slurry that has passed through the filter element 2 is sent out. While the filter element 2
In a strainer device configured to discharge the slurry coarse particles and the like remaining in the coarse particle collecting section 8 to the outside, and further including a stirring means 26 inside the coarse particle collecting section 8,
The stirring means 26 is characterized in that it is configured to generate convection in the vertical direction in the coarse particle collection section 8.

According to a second aspect of the present invention, the filter element is disposed in the main body casing and a coal slurry formed by mixing pulverized coal and a liquid such as water is passed through the filter element. 2 is configured to leave coarse particles and the like upstream of the filter element 2 and discharge the remaining slurry coarse particles and the like from the coarse particle collecting section 8 provided below the filter element 2 to the outside. In the strainer device in which the stirring means 26 is disposed in the inside 8, the stirring means 26 is characterized in that it is configured to generate a convection in the coarse particle collection section 8 in the vertical direction.

In the strainer device according to the first and second aspects, the coal slurry formed by mixing the fine coal powder and a liquid such as heavy oil or water is filtered by the filter element 2 in the casing 1 to form the casing. 1 is sent out. The coarse particles that cannot pass through the filter element 2 remain on the upstream side of the filter element 2 and gradually sink into the coarse particle collection unit 8. At this time, convection is generated in the vertical direction inside the coarse particle collection unit 8 by the stirring means arranged inside the coarse particle collection unit 8. The coarse particles that have settled from the filter element 2 into the coarse particle collection unit 8 are involved in the convection in the coarse particle collection unit 8 and repeatedly float and descend in the coarse particle collection unit 8. Then, it is discharged to the outside from the coarse particle collection unit 8 as appropriate. The strainer device according to claim 1 is directed to a structure in which the coal slurry flows from the inside of the filter element 2 to the outside, but the strainer device according to claim 2 has another structure, that is, the outside of the filter element 2. And those using a filter element 2 other than a cylindrical one.

The strainer device according to a third aspect of the present invention is the strainer device according to the first or second aspect, wherein the agitating means is a screw-type blade mounted on a drive shaft that is rotationally driven by a drive source such as a motor. 28.

As the stirring means, it is preferable to use a screw-type blade 28 as described in claim 3, but a propeller-type blade may be used.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view of a strainer device according to an embodiment of the present invention, and FIG. 2 is a configuration diagram of a scraper. First, as shown in FIG.
A vertically extending cylindrical casing 1 is provided, and a substantially cylindrical filter element 2 is disposed inside the casing 1. The filter element 2 has a flange 3 at the upper end,
The flange 3 is fixed to an element mount 4 provided around the inner surface of the casing 1. Filter element 2
Is at substantially the same height as the lower end opening of the casing 1.

A fluid inlet pipe 5 is provided above the element mount 4 on the side surface of the casing 1 so as to communicate with the inside of the filter element 2. Is provided.
An annular flange 7 is provided at a lower end portion of the casing 1 so as to be in intimate contact with an outer peripheral portion of a lower end of the filter element 2 inward, and an inverted conical coarse particle collecting portion 8 is provided below the flange 7. Is attached, and the lower end opening of the filter element 2 communicates with the upper end opening of the coarse particle collecting section 8. The upper end of the annular space communicating with the fluid outlet pipe 6 from between the outer peripheral portion of the filter element 2 and the inner surface of the casing 1 is provided with a flange 3 and an element mounting base 4.
, And the lower end is closed by the lower end of the filter element 2 and the flange 7. A coarse-grain return pipe 9 is provided at the lower end of the coarse-grain collection section 8, and the coarse-grain return pipe 9 includes a drain valve 10. Casing 1
Is sealed by a lid 11. The lid 11 is provided with an air outlet pipe 12 for discharging the air inside the casing 1 to the outside. A motor 13 is provided above the lid 11.
And a speed reducer 14 are provided. The upper end of the drive shaft 15 is attached to the motor 13 via the speed reducer 14, and the drive shaft 15 is driven to rotate by the motor 13. The drive shaft 15 is moved from the speed reducer 14 to the bearing 1 provided on the lid 11.
6, extends to the coarse-grain collection part 8 through the center of the filter element 2, and a stirring blade 26 as a stirring means described later is attached to a lower end thereof. The drive shaft 15 is supported by a shaft support plate 17 fixed to the element mount 4 together with the filter element 2. A clutch 18 is provided on the drive shaft 15 between the lid 11 and the shaft support plate 17. This is to prevent an overload from acting on the drive shaft 15.

As shown in FIG. 2, two support rods 19, 2
0 is fixed substantially perpendicular to the drive shaft 15 and the support rod 1
Scraper mounting shafts 21 are fixed to both ends of 9 and 20 in parallel with the drive shaft 15 by metal fittings 22. Further, a scraper base 23 is rotatably mounted on the scraper mounting shaft 21, and a scraper 24 is fixed to the scraper base 23. A spring 25 is fitted on the scraper mounting shaft 21, and the tip of the scraper 24 is pressed against the inner surface of the filter element 2 by the spring 25.

The stirring blade 26 is provided with a spiral (screw type) blade 28 around a sleeve 27. The blade 28 has an inversely conical shape whose radial projection length extends from the upper end to the lower end of the sleeve 27 along the inner surface of the coarse particle collecting portion 8. The hollow portion of the sleeve 27 is fitted into the lower end portion of the drive shaft 15, and the implant key 29 is fixed so that the sleeve 27 does not rotate with respect to the drive shaft 15. Further, a nut 30 is screwed onto the lower end of the drive shaft 15 to prevent the stirring blade 26 from coming off the drive shaft 15.

The strainer device is operated by the above configuration. First, coal slurry is injected from the fluid inlet pipe 5 with the drain valve 10 closed. The coal slurry is a mixture of fine coal powder and a liquid such as heavy oil or water, and 90% or more of the contained particles have a size of 1.5 to 2 mm or less. The injected coal slurry is filtered by the filter element 2 inside the casing 1, passes through the outer periphery in the casing 1, and flows out of the fluid outlet pipe 6 to the outside. Foreign matter and excessive particles (hereinafter referred to as coarse particles) that cannot pass through the filter element 2 remain inside the filter element 2. In addition, the scraper 24 is rotated by the drive shaft 15 driven by the motor 13 via the speed reducer 14 to scrape coarse particles adhered to the inner surface of the filter element 2. Then, these coarse particles gradually sink into the coarse particle collecting section 8 and are discharged to the outside by opening the drain valve 10 at appropriate time intervals. At this time, in order to prevent the coarse particles from being deposited on the inner surface of the coarse particle collection section 8, the stirring blade 26 rotates to stir the coarse particles.

When the stirring blade 26 is rotated in the coarse particle collection section 8, the coal slurry near the sleeve 27 flows upward by the blade 28. Stirring blade 26
The coal slurry that has reached the upper part of the flow then flows between the blade 28 and the inner surface of the coarse particle collecting part 8 toward the lower part of the coarse particle collecting part 8, and then flows upward again by the blade 28. To go. The sleeve 2 thus generated by the blade 28
Along with the upward flow in the vicinity of 7, a downward flow is generated between the blade 28 and the inner surface of the coarse-grain collection unit 8, and the convection in the vertical direction is generated in the coal slurry in the coarse-grain collection unit 8. Occurs. The coarse particles that have settled are entrained in the vertical convection generated by the stirring blades 26, and repeatedly float above the stirring blades 26 or descend to the lower part of the coarse particle collection unit 8. Due to such a flow generated between the blade 28 and the inner surface of the coarse particle collecting unit 8, the coarse particles hardly adhere to the inner surface of the coarse particle collecting unit 8,
The accumulation of coarse particles on the inner surface of the coarse particle collection section 8 can be reduced. The stirrer blades 26 are formed by the adhered and deposited coarse particles.
Of the blade 28 can be prevented from being hindered from rotating or being damaged, and the service life and operational reliability of the device can be improved.

When the stirring blade 26 is rotated so that the coal slurry in the vicinity of the sleeve 27 flows downward by the blade 28, the coal slurry in the coarse particle collection unit 8 is rotated in a direction opposite to the above case. However, even in this case, the adhesion and deposition of coarse particles on the inner surface of the coarse particle collection unit 8 can be reduced as in the case described above.

In the above embodiment, the shape of the stirring blade 26 is such that the spiral (screw type) blade 28 is provided around the sleeve 27. It need not be this shape. For example, even when a propeller-shaped blade is used, the coal slurry inside the coarse-grain collecting section 8 can similarly cause convection in the vertical direction, and the coarse particles adhere to the inner surface of the coarse-grain collecting section 8. , Can reduce deposition. In the above description, the coal slurry is allowed to pass from the inside to the outside of the filter element 2. However, even a configuration in which the coal slurry passes from the outside to the inside of the filter element 2 is provided with the coarse-grain collection unit 8. If it is, it can be carried out in the same manner as described above.

[0021]

In the strainer device according to the first and second aspects of the present invention, the convection in the vertical direction is generated in the coarse-grain collecting section, so that the convection occurs in the upward or downward direction near the inner surface of the coarse-grain collecting section. Since the flow is generated, it is possible to reduce the amount of coarse particles or the like which are going to settle by gravity on the inner surface of the coarse particle collecting portion. for that reason,
The service life and operation reliability of the strainer device can be improved.

Further, the strainer device according to the third aspect can be made compact when it is implemented.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a strainer device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a configuration of a scraper used in the above device.

FIG. 3 is a longitudinal sectional view of a conventional strainer device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 2 Filter element 8 Coarse-grain collection part 13 Motor 15 Drive shaft 28 Blade

Claims (3)

[Claims] A coarse-grain collecting part (8) having a cylindrical filter element (2) disposed in a casing (1) and a cross-sectional area that becomes smaller at a lower portion of the bottom of the filter element (2). And a coal slurry obtained by mixing pulverized coal and a liquid such as water is introduced into the filter element (2), and the coal slurry that has passed through the filter element (2) is sent out. On the other hand, it is configured to discharge the slurry coarse particles and the like remaining in the filter element (2) from the coarse particle collecting section (8) to the outside, and further, a stirring means ( 2
The strainer device according to (6), wherein the agitating means (26) is configured to generate convection in the coarse particle collection portion (8) in the vertical direction. 2. A filter element (2) is disposed in a main body casing (1), and a coal slurry formed by mixing pulverized coal and a liquid such as water is passed through the filter element (2), whereby a filter element (2) is formed. Coarse particles remain on the upstream side of 2), and filter element (2)
The apparatus is configured to discharge the remaining slurry coarse particles and the like from the coarse particle collecting section (8) provided below the outside to the outside, and further, a stirring means (26) is arranged in the coarse particle collecting section (8). In the strainer device, the stirring means (26) is configured to generate a convection in the vertical direction in the coarse particle collecting portion (8). 3. The stirring means (26) is provided with a motor (1).
A drive shaft (15) driven by a drive source such as 3)
The strainer device according to claim 1 or 2, wherein the strainer device is constituted by a screw-type blade (28) mounted on the device.