JP2002228051A - Powdery and granular material transport pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve problems that it is impossible to check where and how the char is filled inside a pipe since a conventional powder transport pipe is formed of an opaque material, any abrasion cannot be detected before the pipe is abraded and any hole is opened in a pipe wall in a transport pipe with a spacer having a pressurized chamber inserted inside thereof, and transparent plastic cannot be used for a hot and highly abrasive powdery and granular material such as char. SOLUTION: At least a part of a pipe for transporting the powdery and granular material is formed of transparent plastic, and the transparent plastic contains either of, or at least two or particles, short fibers and long fibers. The powdery and granular material transport pipe comprises a cylindrical pipe, a blind flange provided on both ends of the cylindrical pipe, and an opening part having a flange provided on a barrel part of the cylindrical pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe for transporting powdery and granular materials, and more particularly to a pipe for transporting powdered fluid at a high temperature such as a coal gasifier.

[0002]

2. Description of the Related Art Conventionally, metal such as steel has been used for a piping for transporting granular materials. For example, FIG. 3 shows a main part circuit diagram of a two-stage fluidized bed coal gasifier. In the figure, a coal gasifier 6 is composed of a gasifier 7 located at an upper stage and a coal char combustion furnace 8 located at a lower stage. They are connected by a pipe 11. Further, a coal feeder 9 is connected to the upper stage. The coal supplied from the coal feeder 9 generates gas in the upper gasification furnace 7, but the char 10, which is the unburned portion of the coal, passes through the powder fluid transport pipe 11 to the lower coal char combustion furnace 8. Sent to and processed. However, since the powder fluid transport pipe 11 is U-shaped, the char 10 may be clogged in the pipe. However, since the pipe 11 is formed of an opaque material such as steel, Can not be monitored.

As a method for monitoring the clogging of a bent portion of a powder transport pipe, there is a method of monitoring pressure in the pipe. For example, Japanese Patent Application Laid-Open No. Hei 8-91566 discloses a T-shaped insert inserted in a bent section. A spacer is provided in the bag-shaped space of the tee-shaped tube in which one end of the horizontal bar portion is closed to form a bag-shaped space, and a pressurizing chamber is provided inside and the surface in contact with the powder has a stepped shape. A powder transport pipe configured to monitor a pressure in a pressure chamber is disclosed. In addition, pipe joints used for connecting pipes for transporting fluids that place importance on hygiene such as foods and pharmaceuticals include Utility Model Registration No. 304891.
As disclosed in Japanese Unexamined Patent Publication No. 1 (Kokai) No. 1-2004, a pipe joint made of transparent plastic is disclosed.

[0004]

However, since the powder transport pipe disclosed in Japanese Patent Application Laid-Open No. Hei 8-91566 is formed of an opaque material as in the case of the conventional product, where and how much is in the pipe. I can't tell if it's clogged. Also, provided in the bag-shaped space of the T-tube,
Spacers with a pressurized chamber inside and a step-shaped surface in contact with the powder are used to detect wear by opening holes in the wall, so the operation status of equipment such as a coal gasifier It is not sufficient as a powder fluid transport pipe for monitoring in real time.

On the other hand, the pipe joint disclosed in Japanese Utility Model Registration No. 3048911 uses a transparent plastic. However, since the char from coal gasifiers is a high-temperature and highly wear-resistant powder fluid, it is inappropriate to use transparent plastics with poor heat resistance and wear resistance as powder fluid transport pipes for coal gasifiers. is there.

[0006]

SUMMARY OF THE INVENTION A powder transporting pipe according to the present invention has been made in order to solve the above-mentioned problems, and at least a part of a pipe for transporting powder is formed of transparent ceramics. In this case, the transparent ceramics is a powder / particle transporting pipe containing any one of particles, short fibers or long fibers, or two or more.

[0007] The shape of the powder transporting pipe includes a cylindrical pipe, blind flanges provided at both ends of the cylindrical pipe, and an opening having a flange provided at the body of the cylindrical pipe. Have been.

[0008]

Embodiments of the present invention will be described below. Ceramics are classified into oxide-based materials such as alumina and zirconia and non-oxide-based materials such as silicon nitride and silicon carbide from the viewpoint of the raw material. On the other hand, ceramics mainly composed of silicon nitride have excellent mechanical properties at high temperatures, and are being used for automobile engines and gas turbines.
Silicon carbide is also promising as a highly heat-resistant engineering ceramic.

As a transparent structural material, there is a synthetic resin or a glass. However, the limit of the temperature of the synthetic resin is 850 ° C., and the use temperature of the heat-resistant glass or the high melting point glass is 1000 ° C. or less. On the other hand, the heat-resistant temperature of ceramics is 1000-2.
Since it is 000 ° C., it can be used for powdered fluids in a temperature range where synthetic resin and glass cannot be used. Transparent ceramics include quartz glass, translucent alumina, spinel composed of magnesia, alumina, and the like, transparent zinc sulfide, diamond, and the like. However, for applications requiring high strength, such as pipes that generate vibration due to the transport of powder fluid, ceramics with low toughness such as quartz glass are not suitable.

The greatest drawback of ceramics that exhibit high strength at high temperatures is the low toughness. Particles, short fibers or long fibers, or 2
By including one or more, it is possible to produce a transparent ceramic having higher toughness.

In order to improve the toughness of ceramics,
Whisker or ceramic fiber mixed in ceramic matrix is used for fiber reinforced ceramics (FR
C = Fiber Reinforced Cerami
cs). FRC can be roughly classified into a short fiber reinforced type and a long fiber reinforced type.

Whiskers are often used as a reinforcing material for short fibers, and SiC (silicon carbide) is a typical example. SiC fibers are often used as reinforcing materials for long fibers. When a force is applied to a brittle material such as ceramics from the outside, the generated cracks (cracks) or the existing cracks are enlarged and lead to a total destruction. It is the role of the reinforcing fibers to suppress the expansion of the crack. The mechanism by which the toughness of ceramics is improved by fiber reinforcement is
It is considered that crack deflection, pullout, microcracking, application of compressive stress, and the like are performed in combination.

On the other hand, as means for improving the toughness of ceramics together with fiber reinforcement, for example, there is a method of dispersing and strengthening ZrO ₂ (zirconia) particles. In this case, Z
Although rO ₂ (zirconia) particles may be used alone, multi-toughening used together with fiber reinforcement is not limited to fiber reinforcement and
This is a strengthening system that combines rO ₂ dispersion strengthening. ZrO ₂
The mechanism of improving toughness by dispersion strengthening utilizes stress-induced transformation, and ZrO ₂ undergoes phase transformation from cubic to tetragonal to monoclinic in order from the high temperature side. When cracks have been enlarged ZrO ₂ medium reaches the tetragonal ZrO ₂ grains are dispersed, tetragonal ZrO ₂ is induced in the tensile stress of the crack tip causes a phase transformation to monoclinic crystal, a few percent of the volume expansion Pass through. This volume expansion absorbs the stress at the tip of the crack and suppresses the crack from expanding.

FIG. 1 is a side sectional view showing an example of the embodiment of the present invention. In the figure, a powder fluid transport pipe 1 is provided with blind flanges 3 at both ends of a cylindrical pipe 2 having an appropriate length. Two openings 5 having flanges 4 at the opening edges are provided in the body of the cylindrical tube 2, one of which is an inlet tube and the other is an outlet tube.

[0015]

FIG. 2 is an explanatory view showing an embodiment in which the present invention is applied to a two-stage fluidized bed type coal gasifier. In the figure, a coal gasification furnace 6 is composed of a gasification furnace 7 located at an upper stage and a coal char combustion furnace 8 located at a lower stage. The gasification furnace 7 and the coal char combustion furnace 8 are transported in powder and granular form. Connect with piping 1. Further, a coal feeder 9 is connected to the upper stage. The coal supplied from the coal feeder 9 generates gas in the upper gasification furnace 7, and the char 10, which is the unburned coal, flows into the cylindrical pipe through the inlet side of the opening 5 and opens. It flows out from the outlet side of the section 5 and is treated in the lower coal char combustion furnace 8.

Since the char 10 has a high temperature of 1000 ° C. or more and is a powder fluid, the conventional powder fluid transport pipe 11 is severely worn. However, since the present invention is a fiber-reinforced transparent ceramic, it withstands a high temperature of 1000 to 2000 ° C. and is very excellent in abrasion resistance. Further, since the powder fluid transport pipe 1 according to the present invention is formed in a U-shape, the char 10 passes through the inlet side of the opening 5 and the cylindrical pipe 2
Impacts vertically inside It is known that the wear of a normal metal material or the like is maximized when the powder strikes obliquely, and the wear is reduced when the powder strikes vertically, so that it is formed in a U-shape. Also, since the powder fluid transport pipe 1 is bent in a U-shape, the char 10 may be clogged in the pipe. However, since the powder fluid transport pipe 1 is made of transparent ceramics, It can be monitored in real time by visual observation or by a camera.

[0017]

According to the present invention, there is provided a powdery and granular material transport pipe comprising particles,
Either a short fiber or a long fiber, or a transparent ceramic containing two or more, a cylindrical pipe, blind flanges provided at both ends of the cylindrical pipe, and a cylindrical pipe provided at a body thereof. And an opening having a flange. Therefore, the transportation state of the powder fluid can be monitored in real time by visual observation or remote-controlled television observation, so that operation management is facilitated and operability is significantly improved.

[Brief description of the drawings]

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

FIG. 2 is a block diagram showing an embodiment in which the present invention is applied to a two-stage fluidized bed coal gasifier.

FIG. 3 is a main block diagram of a conventional two-stage fluidized bed coal gasifier.

[Explanation of symbols]

 1, 11 Powder fluid transport pipe 2 Cylindrical pipe 3 Blind flange 4 Flange 5 Opening 6 Coal gas furnace 7 Gasifier 8 Coal M char combustion furnace 9 Coal feeder 10 Char

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H111 AA01 BA09 BA24 CB30 CC03 DA26 DB13 4G030 AA07 AA17 AA36 AA37 AA47 AA56 AA60 AA66 BA20 BA21 BA25 HA01 HA12

Claims (3)

[Claims] 1. A powder / particle transport pipe, wherein at least a part of the pipe for transporting the powder / particles is formed of transparent ceramics. 2. The powder and granular material transporting pipe according to claim 1, wherein the transparent ceramics contains any one of particles, short fibers and long fibers, or two or more thereof. 3. A cylindrical pipe, a blind flange provided at both ends of the cylindrical pipe, and an opening having a flange provided at a body of the cylindrical pipe. Powder fluid transport piping as described.