JPH0148309B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is particularly aimed at efficiently and continuously burning particulate matter consisting of small combustible pieces such as rice husks and sawdust.
This relates to a granular combustion furnace that can extract the combustion heat in the form of hot air.

Conventional technology Conventionally, a fumigation chamber consisting of perforated plates on both the inner and outer walls is connected to the upper part of the ventilation chamber, and during work, particulate matter is introduced while remaining in the fumigation chamber, and the particulate matter in the fumigation chamber is removed from the ventilation chamber. It becomes red hot with the airflow, and the fumigation action at that time liberates flammable gas from the particulate matter, which combusts in the primary combustion chamber and secondary combustion chamber along with the airflow, and the combustion heat at that time is transferred to the blower. Particulate matter combustion furnaces are known in which hot air is generated by transferring the air flow from the

In addition, a water-containing waste drying and incinerator in which a central tower furnace and a leaning tower furnace are installed inside a cylindrical incinerator to form a cone-shaped fire bed, and a combustion chamber is formed in the lower part of the incinerator is disclosed in Japanese Patent Publication No. 45-8950. known as.

Furthermore, a rice grain incineration device was developed in 1977, which was equipped with a combustor in the combustion chamber, blown air into the combustor through a fan, and fed the rice grains into the combustor from bottom to top using a screw conveyor. It is known as Publication No.-8592.

Problems to be Solved by the Invention However, in conventional particulate matter combustion furnaces, the communication port between the ventilation chamber surrounding the outer peripheral porous wall of the fumigation chamber and the blower that blows air into the ventilation chamber is biased toward the blower side. Moreover, when the communication port between the blower chamber and the blower is placed in one place, the air flow from the blower is not evenly distributed over the entire area of the blower chamber, resulting in uneven combustion of particulate matter in the fumigation chamber.

Uneven combustion of particulate matter in the fumigation chamber causes inconveniences such as, on the one hand, distortion of the fumigation room due to high temperatures due to abnormal combustion of particulate matter, and on the other hand, continuous operation may be stopped due to poor combustion of particulate matter. brought about.

In addition, in the method described in Japanese Patent Publication No. 45-8950, the flame or high-temperature hot air fills the combustion chamber, passes through the flame vent, sequentially fills the gaps in the central tower furnace and the leaning tower furnace, and the central tower Flame or high-temperature hot air is injected from the injection holes of the furnace and leaning tower furnace onto the cone-shaped grate, and the materials to be incinerated that fall into the cone-shaped grate from the inlet are incinerated by the secondary air ejected from the sprinkler. There was something to do.

Furthermore, what is described in Japanese Patent Publication No. 45-8592,
Air is introduced into the combustor from a blow pipe via a fan through a large number of branched small pipes, and is also blown from the blow pipe through the branch pipes from above and below the combustor.

It is an object of the present invention to address the above-mentioned problems and to
The blower blows air into the air storage chamber, causing the airflow to lose its direction and momentum, and the perforated plate provides resistance to the airflow from the air storage chamber to the ventilation chamber, thereby preventing the supply of air from the ventilation chamber to the fumigation chamber. By distributing the particles evenly, the combustion of particulates in the fumigation chamber can be performed in a stable state, and the fumigation chamber is not distorted by abnormal combustion of particulates, and continuous operation can be maintained to stabilize the amount of heat in the hot air. The object of the present invention is to provide a possible granular combustion furnace.

Means for Solving the Problems The granular material combustion furnace of the present invention includes an inner peripheral porous wall disposed inside a cylindrical body, and a circle having a larger diameter on the upper side spaced apart from the lower part of the inner peripheral porous wall. A conical outer peripheral porous wall is provided, a ventilation chamber is formed around the outer peripheral porous wall, a fumigation chamber communicating with the ventilation chamber is formed between the inner peripheral porous wall and the outer peripheral porous wall, and a fumigation chamber is formed between the inner peripheral porous wall and the outer peripheral porous wall. A combustion chamber communicating with the fumigation chamber is formed inside the peripheral porous wall, a perforated plate is provided at the bottom of the ventilation chamber, an air storage chamber communicating with the ventilation chamber is provided at the bottom of the perforation plate, and the air storage The structure is characterized in that a blower is connected to the room.

Embodiments Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

In the figure, 1 is a combustion furnace, and a machine room 3 is provided below a combustion section 2 of the combustion furnace 1.

An inner peripheral porous wall 4 is provided inside the cylindrical body of the combustion section 2, and an outer peripheral porous wall 5 whose upper diameter is larger is provided at a lower part of the inner peripheral porous wall 4 at intervals,
An annular air passage 6 is formed outside the outer peripheral porous wall 5, and a porous bottom plate 7 serving as a resistance plate is provided below the outer peripheral porous wall 5.

The inner peripheral porous wall 4 is formed of a porous plate except for its peripheral edge, and as shown in the figure, the center thereof is recessed into a cylindrical shape, and the lower part thereof is a conical portion 8.

The outer peripheral porous wall 5 is disposed below the conical portion 8 of the inner peripheral porous wall 4 at a predetermined interval, and is formed from a conical porous plate.

The upper edge of the outer peripheral porous wall 5 is in contact with the inner wall of the annular air blowing passage 6, and the lower end of the outer peripheral porous wall 5 is connected to a pressure feed pipe 22, which will be described later.

An upper plate 9 is provided above the annular air passage 6, and the upper plate 9 is formed from a perforated plate having holes having a circumferential component.

The peripheral edge of the porous bottom plate 7 is fixed to the inner wall of the annular air passage 6.

A ventilation chamber 1 surrounded by an inner wall of an annular ventilation passage 6 and a porous bottom plate 7 is provided around the outer peripheral porous wall 5 inside the combustion section 2.
0 is formed, and the porous bottom plate 7 is arranged at the bottom of the ventilation chamber 10.

A fumigation chamber 11 communicating with the ventilation chamber 10 is formed between the inner peripheral porous wall 4 and the outer peripheral porous wall 5, and the fumigation chamber 11 is provided inside the cylindrical recess and conical portion 8 of the inner peripheral porous wall 4. A primary combustion chamber 12 is formed in communication with the primary combustion chamber 12, and a secondary combustion chamber 13, which is a space in the combustion section 2 communicating with the primary combustion chamber 12, is formed in the upper part of the inner peripheral porous wall 4. It communicates with the ventilation chamber 10 via the chamber 11.

A buffer plate 15 is provided inside and above the secondary combustion chamber 13 of the combustion section 2, and an on-off valve 16 is provided on the upper wall of the combustion section 2 facing the secondary combustion chamber 13 so as to be openable and closable.

A hot air outlet duct 18 communicating with the secondary combustion chamber 13 is connected to the side wall of the combustion section 2 via an annular partition wall 17 with a perforated upper part, and a lower part of the hot air outlet duct 18 communicates with the fumigation chamber 11. A cyclone 19 for ash removal is connected.

There is a ventilation chamber 10 inside the machine room 3 at the bottom of the combustion section 2.
A blower 20 is provided for blowing air into the air, a pressure pipe 22 having a conveying spiral body 23 inside is provided on the side of the blower 20, and the lower end of the outer peripheral porous wall 5 communicates with the fumigation chamber 11. A motor 21 for driving a spiral body 23 is provided on the side of the pressure feed pipe 22 opposite to the blower 20 .

The lower end of the spiral body 23 is operatively connected to the motor 21 via a belt pulley.

A particulate material supply chute 24 is connected near the lower end of the pressure feed pipe 22 .

An air storage chamber 25 communicating with the ventilation chamber 10 is provided at the lower part of the porous bottom plate 7, and a blower 20 is connected to the air storage chamber 25.

The ventilation chamber 10 is a chamber that surrounds the outside of the conical outer peripheral porous wall 5 of the fumigation chamber 11 and has the porous bottom plate 7 as the bottom wall, and the air storage chamber 25 is a chamber that has the porous bottom plate 7 as the top wall. It communicates with the ventilation chamber 10 and is formed flat.

The air outlet of the blower 20 is branched and connected to the annular air passage 6 of the combustion section 2 and the air storage chamber 25, respectively.

Next, the operation of this embodiment will be explained.

First, when the power to the combustion furnace 1 is turned on, the machine room 3
The motor 21 and the blower 20 inside are respectively driven, and the motor 21 rotates the spiral body 23, and the blower 20 blows air into the annular blowing passage 6 and the air storage chamber 25.

Next, when the granules are supplied from the granule supply chute 24, the granules are sent upward through the pressure feed pipe 22 and into the fumigation chamber 11 as the spiral body 23 rotates.
filled with.

Therefore, when the particulate matter that has risen to the top of the fumigation chamber 11 is ignited, the fire eventually spreads over the entire area of the fumigation chamber 11, and almost the entire area inside the fumigation chamber 11 becomes red hot, and the particulate matter inside the fumigation chamber 11 becomes fumigated. and liberate flammable gases.

This combustible gas enters the primary combustion chamber 12 on the air flow generated by the blower 20, as shown by the arrow in the figure.

In the primary combustion chamber 12, this combustible gas is sent from the blower 20 through the air storage chamber 25, the blowing chamber 10, and the fumigation chamber 11 to obtain sufficient oxygen, where most of it is combusted and becomes hot air with the air flow. and enters the secondary combustion chamber 13.

In the secondary combustion chamber 13, the remaining unburned gas is also completely combusted, and the airflow becomes hot air.

The combustion heat of the combustible gas heats the air from the blower 20 to become hot air, and the hot air in the secondary combustion chamber 13 normally passes through the porous part at the top of the annular partition wall 17 and reaches the hot air outlet duct 18, where it dries the paddy. They are sent to plants, greenhouses, etc.

When the hot air in the secondary combustion chamber 13 of the combustion section 2 is not used, the on-off valve 16 is opened to release the hot air to the outside of the combustion furnace 1.

Here, the air from the blower 20 first enters the air storage chamber 25, and from the air storage chamber 25 enters the air blowing chamber 10 via the porous bottom plate 7.

The blowing air first loses its directionality and kinetic force in the air storage chamber 25, and then acts statically on the blower chamber 10 through the many holes of the porous bottom plate 7, and the blower chamber 10
The air flows uniformly into the fumigation chamber 11 from the holes throughout the entire area of the outer peripheral porous wall 5.

As long as particulate matter is supplied from the particulate supply chute 24, particulate matter remains in the fumigation chamber 11 at all times, and the particulate matter in the fumigation chamber 11 is pushed up from below by new particulate matter sent in by the spiral body 23. As it gradually moves upward, it becomes red hot and releases flammable gas, resulting in continuous combustion.

The particulate matter that has reached the upper part of the fumigation chamber 11 becomes ash from which all combustible gases have been liberated, and the ashes of the particulate matter in the fumigation chamber 11 are disposed of in the porous upper plate 9 of the annular ventilation passage 6 as the particulate matter rises from below. The air is conveyed by the swirling wind blown from the upper plate 9 of the annular air passage 6 sent from the air blower 20 and guided to the cyclone 19, where it is separated from the air.

The above combustion process is performed continuously.

In this way, the particulate matter in the fumigation chamber 11 is continuously and efficiently combusted, and the combustion heat is taken out as hot air from the hot air outlet duct 18 and effectively used for various purposes.

Effects of the Invention As described above, according to the particulate combustion furnace of the present invention, the directionality and kinetic force of the air flow are lost by the blower blowing into the air storage chamber, and the perforated plate removes the air from the air storage chamber. Since it provides resistance to the air flow into the ventilation chamber, the air supply from the ventilation chamber to the fumigation chamber can be evenly distributed, and the combustion of particulate matter in the fumigation chamber can be carried out in a stable state. It is possible to maintain continuous operation and stabilize the amount of heat in the hot air without causing distortion due to abnormal combustion.

[Brief explanation of drawings]

The figure is a longitudinal sectional view of a granular material combustion furnace according to an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Combustion furnace, 2... Combustion part, 3... Machine room, 4... Inner peripheral porous wall, 5... Outer peripheral porous wall, 6... Annular air duct, 7
... Porous bottom plate, 8... Conical portion, 9... Upper plate, 10... Blow chamber, 11... Fumigation chamber, 12... Primary combustion chamber, 13...
Secondary combustion chamber, 15... Buffer plate, 16... Open/close valve,
17... Annular partition wall, 18... Hot air outlet duct, 19...
Cyclone, 20...Blower, 21...Motor, 2
2... Pressure feed pipe, 23... Spiral body, 24... Granular material supply chute, 25... Air storage chamber.

Claims (1)

[Claims] 1 In addition to disposing an inner peripheral porous wall inside the cylindrical body,
A conical outer porous wall having a larger diameter on the upper side is provided at a spaced interval below the inner porous wall, a ventilation chamber is formed around the outer porous wall, and the inner porous wall and the outer porous wall are connected to each other. A fumigation chamber communicating with the ventilation chamber is formed between the wall, a combustion chamber communicating with the fumigation chamber is formed inside the inner peripheral porous wall, a perforated plate is provided at the bottom of the ventilation chamber, and the porous A granular material combustion furnace characterized in that an air storage chamber communicating with the ventilation chamber is provided at a lower part of the plate, and a blower is connected to the air storage chamber.