JP2002332485A - Raw material supply shoot of vertical self-combustion- type furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a raw material supply shoot of a vertical self-combustion- type carbonizing furnace, capable of uniformly distributing raw materials in the furnace and having durability at a high temperature. SOLUTION: This raw material supply shoot 20 of the vertical self- combustion-type carbonizing furnace is located in the vertical self-combustion- type carbonizing furnace 1 which produces charcoal by burning a part of the raw material of organic waste fed through its upper part and carbonizing the raw material by combustion heat thereof so that the center of the shoot consists with the center of the carbonizing furnace, wherein the raw material supply shoot 20 is composed of a raw material supply passageway 24 which supplies the raw material and a cooling medium supply passageway 25 which is formed around the raw material supply passageway 24 and supplies a cooling medium, and the bottom tip of the raw material supply passageway 24 is positioned in a space under an exhaust port 3a for discharging exhaust gas of the vertical self-combustion-type carbonizing furnace 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a raw material supply chute in a vertical type self-combustion type carbonizing furnace for organic wastes, which produces carbonized materials by carbonizing organic wastes such as paper sludge and feces.

[0002]

2. Description of the Related Art A vertical self-combustion type carbonizing furnace for producing charcoal by partially burning organic waste such as paper sludge, sewage sludge, squeeze waste such as juice or tea, and livestock dung, and carbonizing by the combustion heat. However, for example, JP-A-2000-172
No. 69, JP-B-55-4684. The vertical self-combustion type carbonizing furnace burns a part of the organic waste raw material input from the upper part, and carbonizes by the heat of combustion to produce charcoal.

FIG. 3 is a longitudinal sectional view of a conventional vertical self-burning carbonization furnace. At the top of the vertical self-combustion type carbonization furnace 1, a raw material inlet 2 for charging organic waste to be treated and an exhaust pipe 3 for discharging exhaust gas generated in the furnace from the carbonization furnace 1 are provided. Is provided.

[0004] Secondary combustion air 7 is supplied to a combustion zone 6 of the carbonizing furnace 1 from a first air supply port 5 of a side wall 4 of the carbonizing furnace 1. In addition, primary combustion air 9 is supplied to the inside of the lower portion of the carbonization furnace 1 through the second air supply port 8 in the lower portion of the side wall 4. An ignition burner 10 is arranged above the second air supply port 8.

[0005] A cylindrical body 12 having a conical body 11 formed on the upper portion thereof is formed in a portion facing the second air supply port 8 inside the carbonizing furnace 1.
Are arranged, and the cylindrical body 12 and the side wall 4 constitute a ring-shaped space 13. The cylindrical body 12 is rotated by the motor Ml. A discharge table 14 having a truncated cone shape is disposed below the cylindrical body 12, and an upper part of the discharge table 14 is in contact with a lower part of the cylindrical body 11. The space 15 between the discharge table 14 and the inner wall of the carbonization furnace 1 serves as a passage when the refined, that is, carbonized, carbide is discharged to the outside of the carbonization furnace 1. The discharge table 14 is also configured to be rotated by the motor M2.

[0006] The discharge table 14 may be configured to be able to move up and down by a jack J. By adjusting the width of the space 16 by raising and lowering, it is possible to adjust the size of the discharged carbide.

In the carbonizing furnace 1 having the above-described structure, organic waste is charged into the carbonizing furnace 1 from the raw material charging port 2, the ignition burner 10 is ignited to ignite the organic waste, and the second air supply port is provided. The fuel is burned by the primary combustion air supplied from 8. The unburned combustible gas or the like reaches the upper combustion zone 6 in the carbonization furnace 1. Since the secondary combustion air 7 is supplied from the first air supply port 5 to the combustion zone 6, the combustible components are completely burned, and the generation of dioxin and the like can be prevented.

Next, the organic waste that has reached the upper portion of the ring-shaped space 13 is burned by the air supplied from the second air supply port 8, and the waste in the combustion state is removed from the ring-shaped space. 13 reach the lower part. At this stage,
Since the waste is not supplied with air and is in an oxygen-deficient state, the waste is extinguished and steamed to char.

Since the discharge table 14 is rotating, the carbides fall from the space 15 below the discharge table 14 and
It is scraped off by the scraper 16 and discharged from the discharge port 18. At this time, the width of the space 15 can be adjusted by raising and lowering the discharge table 15 with the jack J, so that the size of the discharged carbide can be adjusted. In addition, Japanese Patent Publication No. 55-4885 discloses a structure in which the raw material is supplied from a supply chute on the top side of the carbonization furnace main body, and the raw material is uniformly dropped by an equalizing rod which rotates integrally with a rotating shaft inside the carbonization furnace. It is shown.

[0010]

Problems to be Solved by the Invention
As in the carbonization furnace described in No. 69, when the raw material is charged from a position deviated from the center of the furnace, the raw material does not uniformly fall into the furnace, and even when charged from the center of the furnace,
Under the influence of the gas flow toward the exhaust pipe while the raw material is falling in the furnace, there is a problem that the level of the upper surface of the raw material layer does not become uniform and horizontal, and the quality of the product (carbonized product) becomes uneven.

In the carbonization furnace described in Japanese Patent Publication No. 55-4684, there is a problem in the durability of a shaft, a rod, etc., rotating in a furnace having a high temperature of 800 ° C. or higher.

Accordingly, the present invention is to provide a raw material supply chute capable of uniformly dispersing a raw material in a vertical type self-combustion carbonizing furnace and having durability against high temperatures.

[0013]

The raw material supply chute of the vertical self-combustion type carbonizing furnace according to the present invention burns a part of the organic waste raw material introduced from the upper part and carbonizes it by the heat of combustion. A raw material supply chute arranged at the center of a vertical type self-combustion type carbonizing furnace to be manufactured, wherein the raw material supply chute is formed around a raw material supply passage for supplying a raw material and a raw material supply passage. A cooling medium supply passage for supplying a medium, wherein the lower end of the raw material supply passage is located below a discharge port for discharging exhaust gas from the vertical self-combustion type carbonizing furnace.

[0014]

FIG. 1 is a sectional view showing an embodiment of a vertical self-combustion type carbonizing furnace equipped with a raw material supply chute according to the present invention. The same components as those of the carbonization furnace shown in FIG. 3 described in the above-described conventional technique are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 1, the center of the top of the substantially cylindrical carbonization furnace 1 and the center of the raw material supply chute 20 for supplying the raw material to the center of the cylindrical body 11 are aligned, and the raw material supply chute for supplying the raw material is set. 20 are provided.

The raw material supply chute 20 is a double pipe composed of an inner pipe 21 and an outer pipe 22. FIG. 1 shows the outer tube 2
Although the fire-resistant heat-insulating layer 23 is provided outside the outer tube 2, the fire-resistant heat-insulating layer 23 need not be provided when the outer tube 22 is made of a material having high heat resistance. The inner pipe 21 serves as a raw material supply passage 24 through which the raw material to be treated is introduced into the carbonization furnace, and the lower end thereof serves as a raw material supply port 28. Further, an air supply passage 25 for supplying cooling air as a cooling medium (FIG. 1 shows the case where air is used as a cooling medium) is formed between the inner pipe 21 and the outer pipe 22, and the lower end thereof is an air discharge port. 29.

This cooling air may also serve as secondary combustion air, and if the amount of secondary combustion air is insufficient, the cooling air shown in FIG.
Another air supply port may be added like the air supply port 5 in. Further, the exhaust gas of the carbonization furnace may be recovered by heat using a boiler or the like, or a part of the exhaust gas after being used for drying the raw material may be used in place of the cooling air.

The level of the raw material supply port 28 of the raw material supply chute 20 is arranged below the exhaust port 3a of the exhaust pipe 3,
The raw material supplied from the raw material supply port 28 is set to a level which is not affected by the gas flow toward the exhaust pipe 3.

The upper portion of the raw material supply chute 20 is connected to a supply hopper 26 via a conveyor 27.

In the above configuration, the raw material supplied from the supply hopper 26 to the raw material supply chute 20 via the conveyor 27 falls through the raw material supply passage 24 from the raw material supply port 28 to a position directly above the cylindrical body 12. At that time, the raw material supply port 2
8 is located below the exhaust port 3a.
Raw material layer 13 without being affected by the gas flow toward
To be uniformly dispersed.

Further, since the raw material supply chute 20 is air-cooled with cooling air, the durability against a high temperature atmosphere of 800 ° C. or more is improved.

FIG. 2 is a view showing another embodiment of the air discharge port 29 below the raw material supply chute 20.

FIG. 2 (a) shows a flange 3 at the lower end of the inner tube 21.
0 is formed horizontally and air is discharged from the air discharge port 29 to the carbonization furnace 1.
Are emitted in the lateral direction toward the side wall 4.

FIG. 2B shows a state in which a flange 30 is formed at the lower end of the inner pipe 21 so as to be inclined downward, and the air discharge port 29 is formed.
The air is discharged obliquely downward toward the side wall 4 of the carbonization furnace 1. By discharging the air from the air discharge port 29 in the horizontal direction or obliquely downward, the air can be widely supplied to the combustion zone, and can be effectively used as the secondary combustion air.

[0025]

According to the present invention, the material can be uniformly dispersed in the furnace by charging the material at the center of the furnace and at a position not affected by the gas flow toward the exhaust pipe.

According to the present invention, a cooling pipe made of air is provided outside the supply chute, and cooling air is discharged from the lowermost portion of the supply chute into the furnace, thereby improving the durability of the supply chute. be able to.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a carbonization furnace provided with a raw material supply chute of the present invention.

FIG. 2 is a view showing another embodiment of the air discharge port below the raw material supply chute of the present invention.

FIG. 3 is a vertical sectional view of a conventional vertical self-burning carbonization furnace.

[Explanation of symbols]

1: Vertical type self-burning carbonization furnace 2: Raw material input port 3: Exhaust pipe
3a: exhaust port 4: side wall 5: air supply port 6: combustion zone 7: secondary combustion air 8: second air supply port 9: primary combustion air 10: ignition burner 11: cone 12: cylindrical body 13: Ring-shaped space 14: Discharge table 15: Space 16: Scraper 20: Material supply chute 21: Inner tube 22: Outer tube 23: Refractory heat insulating material layer 24: Material supply passage 25: Air supply passage 26:
Supply hopper 27: Conveyor 28: Raw material supply port 2
9: Air outlet 30: Flange

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Norihiro Hamakawa 46-59 Ohara Nakahara, Tobata-ku, Kitakyushu Nippon Plant Design Co., Ltd. (72) Inventor Hirofumi Onoe 46-59 Nakahara Ohara, Tobata-ku, Kitakyushu Nippon Steel Plastic (72) Inventor Yasunori Saita 46-59 Ohara Nakahara, Tobata-ku, Kitakyushu Nippon Steel Plant Design Co., Ltd.F-term (reference) 4D004 AA01 CA26 CB04 CB31 CB42 4D059 AA30 BB05 4H012 HA06 JA09 JA12

Claims (2)

[Claims] 1. A vertical self-combustion type carbonizing furnace for producing a charcoal by burning a part of an organic waste raw material inputted from an upper part and carbonizing the raw material by the combustion heat. A raw material supply chute, the raw material supply chute comprising: a raw material supply passage for supplying a raw material;
A cooling medium supply passage formed around the raw material supply passage and supplying a cooling medium, and a lower end of the raw material supply passage is located below an outlet for discharging exhaust gas of the vertical type self-combustion type carbonizing furnace. Raw material supply chute for vertical self-combustion type carbonization furnace. 2. A flange is formed at the lower end of the raw material supply passage so that the cooling medium is discharged from the cooling medium discharge port toward the side wall of the carbonization furnace within an arbitrary horizontal or vertical angle range. The raw material supply chute according to claim 1, wherein: