JPS6245442B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention uses firewood, agricultural and forestry waste, etc. as a heat source when igniting the generated carbonization gas to generate stable hot air in a carbonization combustion device that uses wood as fuel. The use of wood is advantageous in terms of reducing fuel costs and is in line with the national policy of saving oil resources. However, when wood is burned in a normal combustion furnace, a. There are problems such as generation of acetic acid vapor and causing pollution.

In order to solve the above problems, it is possible to use a wood carbonization combustion device. FIG. 1 shows an example of a hot air generator for drying agricultural products using this carbonization combustion apparatus. To generate hot air using this device, wood is charged into the carbonization furnace 2 through the inlet 1, ignited by the heavy oil burner 3, and then
It is sealed and the wood is steamed inside. Then, a small amount of air is introduced from the carbonization air damper 4 so that the temperature inside the furnace is maintained at 450°C to 500°C, and the wood is automatically carbonized.

The flammable carbonization product gas generated in the carbonization furnace 2 flows in the direction of arrow A by the draft of the chimney.
When secondary air 6 is blown in at the inlet of the gas combustion chamber 5 and ignited, the carbonized gas is combusted as shown by arrow B.
flow in the direction. In order to obtain the desired hot air by this combustion heat generation, a fan 7 is provided to blow the air. The sent air flows along the outer walls of the gas combustion chamber 5 and carbonization furnace 2 as shown by arrow C, exchanging heat.
After being heated, it is sent to a drying room (not shown) through an air passage 8.

The wood carbonization combustion equipment as explained above has the advantages that it is durable because the furnace wall and hearth of the carbonization furnace 2 do not overheat, it does not generate harmful exhaust smoke, and temperature control is performed accurately. However, it is not easy to stably burn the flammable gas generated in the carbonization furnace in the gas combustion chamber for the following reasons. For example, carbonization, which is carried out as a large-scale industry such as coal carbonization for the production of city gas, is operated under strict supervision and controlled to keep the composition and gas pressure of the produced gas constant. Therefore, once the gas burner supplied with the produced gas (city gas) ejects the gas while mixing an appropriate amount of air and ignites it, combustion continues steadily thereafter. However, in the wood carbonization combustion equipment for agricultural processing as mentioned above, in many cases there are problems such as the type of fuel wood being inconsistent and the moisture content of the wood decreasing as carbonization progresses. Since it includes fluctuation factors, the components and gas pressure of the carbonized gas are likely to fluctuate. For this reason, it is not easy to reliably ignite the wood carbonization product gas and cause stable combustion.

According to the conventional technology, in order to combust the wood carbonization product gas in the gas combustion chamber, it is necessary to blow a flame into the inlet of the gas combustion chamber with a relatively large heavy oil burner and ignite it. For this reason, the consumption rate of heavy fuel oil for ignition is high, increasing operating costs.

The present invention has been made in view of the above circumstances, and has a low fuel consumption rate for ignition, and also enables stable gas combustion by reliably igniting the gas produced by carbonization regardless of the type of fuel wood or changes in the carbonization state. The purpose of this invention is to provide an ignition device that can be used to

In order to achieve the above object, the present invention blows the flame of a heavy oil burner for gas ignition equipped with an igniter that is cleaned by blowing secondary air into an unburned carbonized gas flow path. With,
A member made of a heat-resistant material (hereinafter referred to as a yakidama) that is heated by the flame is provided at the tip of the flame, and a half-conical shaped member made of a heat-resistant insulating material is provided to surround the yakidama. In addition to installing a flow furnace wall, a wire mesh made of heat-resistant metal was installed on the downstream side of the baked ball so that the mixed gas of carbonization product gas and secondary air passed through this wire mesh, and a combustion space was provided downstream of the wire mesh. It is characterized by

Next, one embodiment of the present invention will be described with reference to FIGS. 2 to 4. FIG. 2 is a cross-sectional view of the ignition device according to the present invention installed in the gas flow path 9 connecting the carbonization furnace 2 and the gas combustion chamber 5, and arrow A' indicates the carbonization product gas flow path. There is. The present invention is configured to blow into this flow path the flame of a heavy oil burner equipped with an igniter that is cleaned by blowing secondary air. Reference numeral 10 in FIG. 2 is a heavy oil burner nozzle, which is installed so as to blow a flame 11 in the direction of the carbonization product gas flow arrow A'. This nozzle 1
An igniter electrode 12 for spark discharge ignition is provided near the tip of the 0. This igniter electrode 12
The apparatus receives a high voltage of about 10,000 volts from a separately provided voltage power source to generate a spark discharge and ignite the heavy oil mist sprayed from the nozzle 10. A secondary air blowing pipe 13 is provided facing the igniter electrode 2. 14 is the fuel oil pipe of the burner nozzle 10, and 15 is 1 of the burner nozzle 10.
This is the next air blower pipe.

In the present invention, a baked ball is supported near the tip of the flame ejected from the heavy oil burner nozzle for ignition. Second
In the figure, numeral 16 is a roasted ball made of heat-resistant cast iron with a half-moon shape in cross section and having a through hole 17 in its center, and is supported near the tip of the flame 11 by supports 18 and 19.

The present invention forms a generated gas flow path wall with a heat-resistant heat insulating material so as to surround the above-mentioned baked balls, and
A wire mesh made of heat-resistant metal is installed in the gas flow path on the downstream side. In the embodiment shown in FIG. 2, a furnace wall block 20 is provided to surround the baked ball 16. This furnace wall block 20 is made of a heat-resistant heat insulating material made of alumina cement, perlite, and cinder mixed in a ratio of 3:1:1, and as shown in FIG. It is made in the shape of a half cone. A wire mesh 21 made of nichrome wire is provided on the top surface of this furnace wall block 20. FIG. 4 shows a cross section taken along line XX' of the embodiment shown in FIG. 2. Carbonization product gas flow path arrow
The cross-sectional area of A' is narrowed in the vicinity of the baked ball 16 by the furnace wall block 20. The wire mesh 21 above
The downstream side adjacent to is left as a space so that it can also function as a combustion chamber.

Next, a method of using the above-mentioned ignition device will be explained. Heavy oil is supplied to the burner nozzle 10 through the oil feed pipe 14, and primary air is fed under pressure through the air feed pipe 15, and when the heavy oil is ignited by an electric spark from the igniter electrode 12 while being sprayed, the flame 11 of the heavy oil is emitted into the carbonization product gas flow path.
It is blown towards A′. At the same time, secondary air is blown from the secondary air blowing pipe 13.

The flame 11 hits the baked ball 16 and makes it red-hot, and it is ejected in the directions of arrows D, E, and E' to wrap around the baked ball 16, and a high-temperature area is generated around the baked ball 16. The heat in this high-temperature area tries to dissipate through radiation and conduction, but some of the heat rays radiated by the red-hot baked ball 16 and the flame surrounding it are reflected by the inner surface of the furnace wall block 20 and are prevented from dissipating. .
A part of the radiant heat and conductive heat is absorbed by the inner surface of the furnace wall block 20 and raises its temperature.
Since this furnace wall block 20 is made of a heat insulating material, heat transfer to the surrounding area is hindered. In this way, the heat generated by the heavy oil flame 11 is confined in the area surrounded by the furnace wall block 20, and since air is blown into this area from the secondary air blowing pipe 13, an oxidizing high temperature atmosphere is formed. Ru. The position where it is formed corresponds to the place where the carbonization product gas flow path is constricted by the conical inner surface of the furnace wall block 20, so most of the carbonization product gas passes through this oxidizing high temperature atmosphere and becomes secondary air. The air necessary for combustion is blown into it from the blowpipe, which ignites it.

The wire mesh 21, which is provided at a position slightly downstream of the baked ball 16, becomes red-hot by receiving the heat of the flame ejected from the nozzle 10 and the combustion heat of the carbonized gas. The carbonized gas flow that has passed near the baked ball 16 passes through this red-hot wire mesh 21.
As mentioned above, the carbonized gas is reliably ignited when it passes near the baked ball 16, but since it then passes through the red-hot wire gauze 21, in the unlikely event that it is ignited near the baked ball 16 in the carbonized distilled gas flow. Even if there is a broken part, the wire mesh 21 will ignite it, so ignition will occur with an extremely high probability, and stable combustion will occur within the gas combustion chamber 5. In order for this action to be performed reliably and effectively, it is necessary to provide a space on the downstream side (upward in the figure) of the wire mesh 21.

Generally, the igniter electrode 12 is provided near the immediate front of the burner nozzle, that is, near the base of the flame. Since a reduction flame is generated in this area, carbon is deposited and adhered to the tip of the igniter electrode, which tends to cause a failure that prevents spark discharge. However, in this embodiment, the secondary air blowing pipe 13 is connected to the igniter electrode 1.
Since air is constantly blown toward the igniter electrode 12, the vicinity of the igniter electrode 12 is always in an oxygen-excess state, and carbon deposition due to incomplete combustion is prevented. Moreover, even if carbon adheres, it is blown away, the igniter electrode 12 is always kept clean, and spark discharge is always performed while the device of this embodiment is in operation. In the conventional technology, there is a risk that the igniter electrode 12 may be contaminated with carbon and impede spark discharge, so in order to ensure that the flame 11 of the burner nozzle 10 continues, it is necessary to spray more heavy fuel oil than necessary to create a long flame. However, in this example, as mentioned above, a state is maintained where it can be re-ignited at any time by spark discharge, so the amount of spray from the heavy oil burner 10 can be reduced to make the flame length about 100 mm. The flame of the burner 10 can be reliably continued even when the burner 10 is in use.

Moreover, in this embodiment, the flame of the heavy oil burner 10 is not only blown into the carbonized gas flow, but also the amount of heat generated by the flame is stored in the baked ball 16, and the furnace wall block 20 prevents the heat from dissipating. Since a high temperature region is generated in the vicinity of the baked ball 16, the amount of ignition fuel can be significantly reduced compared to the case where a flame for ignition is simply blown. According to experiments, when the ignition device of the above embodiment was installed in a wood carbonization combustion equipment using a cylindrical carbonization furnace with a diameter of about 60cm and a length of about 110cm (internal volume of about 0.3m ³ ), The consumption rate is 0.5 liters per hour. A carbonization furnace larger than the above, e.g. approx.
Even if a carbonization furnace with a length of 100 cm, a length of approximately 180 cm, and an internal volume of approximately 1.4 m ³ is used, the consumption rate of heavy oil for ignition hardly changes.

As explained above, the present invention blows the flame of a heavy oil burner equipped with an igniter electrode that is cleaned by blowing secondary air into the carbonized gas flow path, and By providing a baked ball to be heated, and surrounding the above-mentioned baked ball with a carbonization product gas flow path wall made of a heat-resistant insulating material, and installing a wire mesh made of heat-resistant metal on the downstream side thereof. It is possible to perform reliable ignition and stable combustion regardless of variations in the type of fuel wood and the carbonization state, and the consumption rate of heavy oil for ignition is low.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a wood carbonization combustion apparatus for processing agricultural products, Fig. 2 is a sectional view of an embodiment of the present invention, Fig. 3 is a perspective view of the furnace wall block used in the above embodiment, and Fig. 4 The figure is a sectional view taken along line XX' of the embodiment. 2... Wood carbonization furnace, 5... Carbonization product gas combustion chamber, 10... Burner nozzle, 11... Flame, 12
...Igniter electrode, 13...Secondary air blowing pipe,
16... Baked balls, 17... Through holes, 18, 19... Supports, 20... Furnace wall blocks.

Claims (1)

[Claims] 1. A device for igniting produced gas that is equipped with an igniter electrode that is cleaned by blowing secondary air in a flow path for flammable unburned carbonized gas that connects the carbonization furnace and the carbonized produced gas combustion chamber in a wood carbonized combustion device. A heavy oil burner is installed to blow a flame into the generated gas flow, and a burnt ball is supported at the tip of the flame, and a piece of heat-resistant heat insulating material is provided surrounding the burnt ball. In addition to providing a half-conical gas flow path wall, a wire mesh made of heat-resistant metal is provided in the carbonization generated gas flow path downstream of the baked ball, and a space for carbonization gas combustion is provided downstream of the wire mesh. A carbonization product gas ignition device for a wood carbonization combustion device.