JPH0148308B2 - - 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 remains in the fumigation chamber (in reality, it gradually moves) and becomes red hot. A granular combustion furnace is known that extracts flammable gas through fumigation and burns it.

Further, a water-containing waste drying and incineration apparatus in which a central tower furnace and a leaning tower furnace are provided inside a cylindrical incinerator to form a cone-shaped grate is known as Japanese Patent Publication No. 45-8950.

Furthermore, a combustion furnace was published in Utility Model Publication No. 44-23501 in which air holes were drilled at regular intervals in the lower part of the peripheral wall of the furnace body to introduce the air flow rotating inside the annular cavity into the combustion chamber along the flow direction. It is known as a gazette.

Problems to be Solved by the Invention However, in conventional granular combustion furnaces, the perforated plate constituting the outer wall of the fumigation chamber simply has holes punched out at right angles to the flat plate, so that relatively little air is removed from the fumigation chamber during operation. A large amount of granular particles and ash easily fall into the ventilation chamber, and these fallen objects gradually accumulate in the ventilation chamber, and if the ventilation chamber is not cleaned frequently, the ventilation function will be obstructed, resulting in poor combustion. Poisonous gases such as carbon monoxide may be generated.

In addition, the one described in Japanese Patent Publication No. 45-8950 was also one in which the leaning tower furnace was simply a flat plate with injection holes cut out.

Furthermore, those described in Utility Model Publication No. 44-23501,
The furnace body was simply a flat plate with air holes punched out diagonally.

It is an object of the present invention to address the above-mentioned problems and to
The lower funnel is not simply a flat plate with holes punched out, but the holes are formed at the circumferential end of the bulge, allowing particles and ash in the fumigation chamber to flow through the holes into the ventilation chamber. It reduces the number of troublesome cleanings inside the ventilation chamber, prevents the ventilation function from being obstructed by particulate matter and ash from the ventilation chamber to the fumigation chamber, and eliminates combustion problems and incompletely combusted gas. An object of the present invention is to provide a granular combustion furnace capable of preventing the generation of hot air.

Means for Solving the Problems In the granular material combustion furnace of the present invention, a lower funnel is provided at an interval below the upper funnel, and the granular material is retained between the upper funnel and the lower funnel. A funnel-shaped fumigation chamber is formed, a ventilation chamber communicating with the fumigation chamber is formed at the lower part of the lower funnel, and the lower funnel forms a number of bulges opening toward one side in the circumferential direction. It has a structure characterized by being made of a perforated plate.

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

In FIG. 1, 1 is a combustion furnace, and the combustion furnace 1
A machine room 3 is provided in the lower part of the combustion section 2.

An upper funnel body 4 is provided inside the cylindrical body of the combustion section 2, and a lower funnel body 5 is provided at a predetermined interval below the upper funnel body 4.
An annular air passage 6 is formed on the outside of the funnel 5, and a perforated bottom plate 7 is provided below the lower funnel body 5.

The upper funnel body 4 is formed of a porous plate except for its periphery, and as shown in FIG. 1, its center is recessed into a cylindrical shape, and its lower part is a conical part 8.

The lower funnel body 5 is disposed below the conical portion 8 of the upper funnel body 4 at a predetermined interval, and is formed from a conical perforated plate.

The upper edge of the lower funnel 5 is in contact with the inner wall of the annular air passage 6, and the lower end of the lower funnel 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 perforated bottom plate 7 is provided at a lower part of the lower funnel body 5 inside the combustion section 2.
A funnel-shaped fumigation chamber 11 is formed between the upper funnel body 4 and the lower funnel body 5 and communicates with the ventilation chamber 10.
A primary combustion chamber 12 communicating with the fumigation chamber 11 is formed inside the cylindrical recessed part and conical part 8 of the upper funnel body 4, and a primary combustion chamber 12 communicating with the primary combustion chamber 12 is formed in the upper part of the upper funnel body 4. A secondary combustion chamber 13 is formed as a space in the combustion section 2, and the primary combustion chamber 12 communicates with the ventilation chamber 10 via the fumigation chamber 11.

A buffer plate 15 is provided inside and above the secondary combustion chamber 13 of the combustion section 2, and a buffer plate 15 is provided inside the secondary combustion chamber 13 of the combustion section 2.
An on-off valve 16 is provided on the upper wall facing 3 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 lower funnel body 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, and a granular material supply chute 24 is provided near the bottom end of the pressure feed pipe 22. The air outlet of the blower 20 is connected to the annular air passage 6 of the combustion section 2 and the lower part of the air chamber 10, respectively.

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

As shown in FIG. 2, the lower funnel body 5, which serves as the outer wall of the fumigation chamber 11 inside the combustion section 2, has a number of bulges formed therein, and the circumferential ends of the bulges have bulges extending in the circumferential direction. It is made of a perforated plate with through holes that open along its length.

The holes in the lower funnel body 5 are not simply punched in a flat plate, but after making numerous cuts in the flat plate, one side of the periphery of the cuts is inserted into the fumigation chamber 1 from the outside.
1 side or the ventilation chamber 10 side in a wedge shape or a semicircular cone shape to form a large number of bulges, and a through hole that opens toward one side in the circumferential direction is formed.

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 are respectively driven, and the motor 21 rotates the spiral body 23, and the blower 20 rotates the annular air passage 6 and the air blower chamber 10.
blow air to.

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 granules that have risen to the top of the fumigation chamber 11 are 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, causing the granules inside the fumigation chamber 11 to become red-hot. is fumigated to liberate flammable gases.

This combustible gas enters from the blower 20 through the blow chamber 10, through the outer wall of the fumigation chamber 11 (numerous holes in the lower funnel 5), and enters through the inner wall of the fumigation chamber 11 (through the upper funnel 4).
It is conveyed to the primary combustion chamber 12 together with the air passing through the holes).

In the primary combustion chamber 12, this combustible gas passes through the blower chamber 10 and the fumigation chamber 11 from the blower 20, obtains sufficient oxygen, burns most of it, and becomes hot air with the air flow, and is converted into a secondary combustion chamber. Enter 13.

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

Under normal conditions, the hot air in the secondary combustion chamber 13 passes through the porous area in the upper part of the annular space 17 to the hot air outlet duct 18.
The paddy is then taken to dryers, 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.

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. gradually move upwards.

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 on the perforated 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, guided to the cyclone 19, and 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 granular material combustion furnace of the present invention, the lower funnel is not simply formed by punching through holes in a flat plate, but the through holes are aligned in the circumferential direction of a large number of bulges. Since it is formed facing towards the side, it is less likely that particulate matter and ash in the fumigation chamber will fall into the ventilation chamber from the ventilation holes, reducing the number of troublesome cleanings inside the ventilation chamber. Since the ventilation function is not obstructed by particles or ash,
It is possible to prevent poor combustion and generation of hot air containing incomplete combustion gas.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a granular combustion furnace according to an embodiment of the present invention, and FIG. 2 is an enlarged perspective view of a main part of the lower funnel shown in FIG. DESCRIPTION OF SYMBOLS 1... Combustion furnace, 2... Combustion part, 3... Machine room, 4... Upper funnel, 5... Lower funnel, 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 feeding pipe, 23... Spiral body, 24... Granular material supply chute.

Claims (1)

[Claims] 1. A lower funnel is provided below the upper funnel at an interval, a funnel-shaped fumigation chamber in which particulate matter accumulates is formed between the upper funnel and the lower funnel, and the lower funnel A granular material combustion furnace characterized in that a blowing chamber communicating with the fumigation chamber is formed, and the lower funnel is made of a perforated plate having a large number of bulges opening toward one side in the circumferential direction.