JPS605206Y2 - combustion device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a combustion device that directly heats a room or the like with the heat generated during combustion of coal or other solid fuel, and particularly relates to a combustion device that uses granular solid fuel.

Insecurity in oil supply affects both price and quantity, and calls are being made to review and develop fuels other than oil.

In the case of indoor combustion equipment, the most readily available alternative fuel is coal or other solid fuels, but combustion equipment that simply combusts it naturally does not generate enough heat, and the exhaust gas contains dust and other harmful components. There is a risk.

The present invention was developed in view of these circumstances, and it is possible to increase the speed of air supply from the bottom of the perforated plate to move solid fuel particles (including crushed coal, etc.) onto the perforated plate. By burning in a fluidized state, stable and even combustion, more efficient combustion with less exhaust gas pollution is achieved, and the end of the combustion gas passage is connected to a cyclone dust collector to remove dust (combustion ash). ).

The invention will now be described with reference to the illustrated embodiments.

The combustion tube 1 has a combustion chamber 2 in the shape of an inverted truncated cone at its lower part, and a perforated plate 3 such as a mesh is provided on the lowest surface of the combustion chamber 2. Below the perforated plate 3, air is fed which also serves as an ash outlet. There is a supply room 4.

A fuel supply pipe 6 that is connected to the bottom of the granular fuel storage hopper 5 opens at the lower side of the combustion chamber 2, and a conveyance screw 8 that is rotationally driven by a drive device 7 is inserted into this pipe.

Therefore, the granular fuel 9 in the hopper 5 is guided into the combustion chamber 2 by the conveying screw 8, and the supply amount per unit time can be changed by the rotational speed of the screw 8.

A blow pipe 10 for supplying air from a blower 11 via a flow rate regulating valve 12 opens into the air supply chamber 4, and an ignition device 13 facing upward is provided in the perforated plate 3.

The ignition device 13 is composed of a burner such as a gas burner or an oil burner, and an ignition device that ignites the burner. When an ignition signal is given by a timer, for example, the ignition device 13 is configured to fire the granules supplied into the combustion chamber 2 for a predetermined period of time. An ignition flame is erupted into the combustion chamber 2 for a sufficient time to ignite the fuel.

Of course, it is recommended to install a see-through confirmation window to confirm ignition.

A cylindrical body 15 connected to the combustion chamber 2 is located at the upper part of the combustion tube 1. A spiral plate 16 is disposed within the cylindrical body 15 to form a spiral combustion gas passage 17.

A gap 1 is formed between the outside of the spiral plate 16 and the inside of the outer peripheral wall of the cylindrical body 15, and a small amount of combustion gas and granular fuel are allowed to pass through this gap 1.

The upper end of the spiral combustion gas passage 17 extends in the tangential direction of the cylindrical body 15, as shown in FIG. 2, and this extension connecting pipe 18 is connected to a cyclone dust collector 20.

The cyclone dust collector 20 has a well-known function of separating dust and gas by the action of the dust's own weight and gas flow. The exhaust pipe 22 is connected to the inside of the dust collection pipe 21 and extended.

The dust-containing gas flows into the dust collecting tube 21 in a spiral shape, the dust with a heavy specific gravity moves to the outside, separates from the gas, and falls downward, and the clean gas flows out from the central exhaust tube 22 to the outside.

The fallen dust is discharged to the outside from the ash outlet 23.

Further, a secondary air outlet 24 is provided inside the extension connecting pipe 18.
is opened, and this jet port 24 communicates with the air supply chamber 4 via a secondary air pipe 25 and a flow rate adjustment valve 26.

In addition, the combustion tube 1, the cyclone dust collector 20, and the hopper 5
is fixed to and integrated with a base 27, and the base 27 is further provided with a control unit 28 that controls the rotational speed of the drive device 7 and the blower 11, respectively.

In addition, the outside including the top surface of the combustion tube 1 and the cyclone dust collector 2
A protective plate or fence 29 is provided between the outside including the upper surface of 0 to prevent combustible materials and other objects from entering between the two.

Therefore, in the combustion device having the above configuration, when the drive device 7 and the blower 11 are driven simultaneously, granular fuel obtained by pulverizing coal or other solid fuel is supplied into the combustion chamber 2, and part or all of this granular fuel is transferred from the blower 11. The liquid is floated and agitated by the air flow, resulting in a fluid state.

If this is ignited using the ignition device 13, the granular fuel can be combusted in a fluid state.

It is known that combustion in such a fluid state can reduce the generation of NOx and SOx, and therefore can contribute to the prevention of air pollution.

Another advantage is that low quality coal with high ash and sulfur content can be used.

The combustion gas is guided into the spiral combustion gas passage 17 and finally reaches the cyclone dust collector 20 via the extension connecting pipe 18. During this time, the outer walls of these combustion gas passages exchange heat with the surrounding air and the air warm up.

In addition, in the gap between the inner wall of the cylindrical body 15 constituting the combustion gas passage 17 and the spiral plate 16, part of the unburned granular fuel and ash is allowed to fall into the combustion chamber 2 or the air supply port 4 to prevent reburning or This has the effect of making it easier to remove the ash.

In addition, the secondary air outlet 24 provided in the extension connecting pipe 18 is
If used when it is difficult to completely burn the fuel in the combustion chamber 2, it is possible to cause secondary combustion to achieve complete combustion of the fuel, and through this, it is possible to further increase the amount of heat generated. .

In summary, the present invention supplies granular fuel to a combustion chamber, creates a granular layer on a perforated plate, and supplies an appropriate amount of air from below the perforated plate to increase its flow velocity, thereby making the fuel fluid and combusting it. This makes it possible to achieve stable and even combustion with no fluctuation in combustion, as well as to obtain combustion that generates a large amount of heat while suppressing the emission of harmful components, and the combustion ash is efficiently collected using a cyclone dust collector. This has the effect of expanding the use of coal-based fuels.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of a combustion device according to the present invention, and FIG. 2 is a cross-sectional view taken along the line ■-■ in FIG. 1... Combustion tube, 2... Combustion chamber, 6...
...Fuel supply pipe, 7...Drive device, End...
... Conveyance screw, 9 ... Granular fuel, 11.
...Blower, 12...Blow pipe, 13...
...Ignition device, 17... Combustion gas passage, 2
0...Cyclone dust collector.

Claims (1)

[Scope of utility model registration request] An air supply chamber is formed below across a perforated plate provided at the lower end of an inverted truncated cone-shaped combustion chamber, a cylindrical body is extended above the combustion chamber, and a cylindrical body is disposed inside the cylindrical body. A spiral combustion gas passage is formed by the provided spiral plate, a gap is formed between the outside of the spiral plate and the inner surface of the cylindrical body, and the cyclone dust collector is installed side by side with the cylindrical body. At the same time, connect the terminal end of the combustion gas passage to the cyclone dust collector, open a secondary air outlet connected to the blower in the vicinity of the connection between the combustion gas passage and the cyclone dust collector, and A supply port of a granular fuel supply device that supplies granular solid fuel is opened in the lower part of the combustion chamber, and an ignition port of an ignition device that ignites the granular fuel is provided in the air supply chamber.
A combustion device formed by opening a blower pipe of a blower device that fluidizes and burns the granular fuel supplied onto the perforated plate of the combustion chamber.