JP5922206B2 - Wood-burning stove - Google Patents

Description

  The present invention relates to a wood stove.

  The wood-burning stove is very popular because of its warmth of far-infrared rays due to its heat storage properties.

  As for the three elements of combustion, combustion cannot be maintained (fire is extinguished) by applying any one of fuel (burning thing: soot), air (oxygen), and temperature (heat to promote oxidation reaction).

  Smoke and soot that is generated when burning soot is exhausted from the heated combustible material (soot), such as moisture and flammable gas, without being burned completely due to lack of oxygen or low temperature, or unburned The thing becomes granular and adheres to water vapor.

  Smoke is not produced when the three elements of combustion are in good condition in the combustion furnace. That is: 1. There is enough fuel. 2. sufficient oxygen is supplied; A sufficiently high temperature is maintained, especially in wood stoves. And 3. The items are important.

How to burn firewood in a wood stove stove is as follows.
The soot heated by an igniting agent (paper, cardboard, etc.) starts to evaporate moisture from about 110 degrees, and then begins to burn by generating hydrocarbon-based volatile gas from the soot resin component from about 200 degrees.

  As the heating further proceeds, the soot cellulose is decomposed and the unburned material disappears in a complete state, and the combustion state is stabilized. The furnace temperature at this time is 600 to 700 degrees. If this temperature can be maintained, no smoke will be emitted from the chimney with any structure stove (even if it is a simple box having no secondary combustion chamber).

  In order to create this combustion condition, a commercially available high-quality stove has a secondary combustion chamber (some models have a tertiary combustion chamber) and maintains a high temperature state.

  The basic wood-burning stove structure is a Japanese-style stove, secondary combustion chamber method, or clean burn method. The Japanese-style stove is a Japanese wood-burning stove that supplies only primary air. It burns incompletely, soot and tar adhere in large quantities, and it is easy to cause a flue fire. Since there is no concept of an exhaust damper, it seems that the furnace has this structure and the combustion space is increased. The result is the same, and the chimney is incompletely burned.

  However, it seems that Japanese houses do not bother with smoke in open spaces, and the chimney is often short, so it seems that it was not a problem even with a simple structure, but in most cases there is incomplete combustion in the chimney. It is.

  In the secondary combustion chamber method, at the time of ignition, primary air is supplied to raise the temperature of the box, and when the temperature becomes high and the woody gas is separated, the gas is sent to the secondary combustion chamber and burned with the secondary air. This is common in high-end stoves, but trees with different wood gas properties such as conifers cannot be burned.

  During ignition, primary air is sent to burn the wood and raise the temperature. If a large amount of wood gas comes out, close the primary side and the chimney side and send air to the secondary combustion chamber. It is a system that heats wood to generate gas and burns it.

  In the clean burn method, a large amount of primary air is introduced at the time of ignition, and the primary side is reduced as the temperature rises. Since the secondary air comes into contact with the generated gas immediately, it burns efficiently. In the case of conifers such as cedar, it can be burned if the primary air is increased.

  Specifically, at the time of ignition, primary air is sent to raise the temperature. The secondary side supplies from the beginning.

  When the temperature rises, squeeze the primary side. Coniferous and moist trees burn well when burned while sending more primary air.

  Although there are three types as described above, the temperature inside the furnace does not reach a sufficiently high temperature when firing, and it is impossible to prevent the generation of smoke with any type of wood stove. (It is also the fate of wood stove)

  A good wood stove can be said to have a function that suppresses the generation of smoke by quickly raising the temperature in the furnace to a favorable condition for combustion.

The following patent document is proposed as an object of disclosing a combustion furnace that does not consume any energy as a combustion auxiliary means and that does not emit smoke completely by complete combustion.
Japanese Patent No. 3066066

  In Patent Document 1, as shown in FIG. 16, a combustion chamber 1 in which an iron plate is covered with a refractory material is configured so that a half of the ceiling surface is constituted by a lid 2, so that a pivotal portion 3 of the lid 2 is centered. Further, it is rotated upward to open the combustion material inlet 4.

  The other side of the ceiling surface is integrally fixed to the upper edge of the side surface of the combustion apparatus, and an exhaust port 5 is formed at a position farthest from the input port 4.

  A chimney 9 is fitted and connected to the exhaust port 5. A metal combustion promotion plate 6 is suspended from the ceiling surface between the exhaust port 5 and the input port 4, and the lower end 6 a of the combustion promotion plate 6 is connected to the floor surface 7 of the combustion chamber 1. Are provided with a predetermined interval l. The length of l is appropriately selected within a range of 1/3 to 1/4 of the height h of the normal combustion chamber.

  The combustion promotion plate 6 has a large number of through holes 6b, 6b,... Distributed and disposed throughout the combustion promotion plate 6 so that the primary combustion chamber 1a side where the inlet is opened, and the exhaust port The secondary combustion chamber 1b side where 5 opens is connected.

  Of course, a heat-resistant material such as ceramic or heat-resistant brick can be used for the combustion promoting plate.

  Reference numeral 8 denotes an ash removal outlet that opens at the lower portion of the side wall of the primary combustion chamber, 2a is a handle drilled in the lid, and 2b is a balance weight that facilitates opening and closing of the lid.

  A combustion furnace throws in incineration into the primary combustion chamber 1a and ignites the upper part of the incineration.

  Air is supplied from the gap between the opening of the inlet and the lid 2 with the lid 2 slightly lifted. A polygonal support piece 2e rotatably supported by a pin 2d projecting laterally on the side edge 2c of the lid 2 is applied to the upper surface of the peripheral edge 4a of the insertion port 4, and the lid 2 The gap is maintained by applying a weight. The amount of air can be adjusted by appropriately rotating the support piece 2e and changing the distance between the pin 2d and the bottom of the support piece 2e.

  Combustion quickly limits the air volume after ignition by limiting the amount of air in the lid (usually 1-2 minutes), and the smoke converges and rapidly approaches the smokeless state.

  When combustion reaches a steady state, most of the combustion airflow in the primary combustion chamber enters the secondary combustion chamber through the passage below the combustion promoting plate.

  At this time, the combustion promoting plate is in a red-hot state, and high-temperature air is supplied from the high-temperature combustion promoting plate through the through-hole to the secondary combustion chamber 1b. Complete combustion state.

  As described above, in Patent Document 1, the combustion promoting plate is suspended from the ceiling surface between the air supply port and the exhaust port, and the primary combustion chamber in which the air supply port is opened and the secondary combustion chamber in which the exhaust port is opened The combustion promoting plate is divided into a large number of through holes communicating with the primary combustion chamber and the secondary combustion chamber. Since the combustion proceeds downward from the upper surface of the injected combustion product, smoke is very little generated even in the early stage of ignition, and further, the combustion promoting plate becomes red hot as the combustion expands, thereby promoting the acceleration. The plate catalyzes combustion and maintains the secondary combustion chamber at a high temperature, and the high-temperature air supplied to the flat secondary combustion chamber through the red hot combustion promotion plate is the temperature in the secondary combustion chamber. Without lowering, in the secondary combustion chamber, evenly, on average, and , Fed enough air.

  Then, when the combustion is in a steady state by providing a gap in the range of 1/3 to 1/4 of the height of the combustion chamber between the lower end edge of the combustion product promoting plate and the floor surface of the combustion chamber , Most of the combustion air flow in the primary combustion chamber enters the secondary combustion chamber through the passage below the combustion promoting plate, so that the combustion flow is completely burned in the secondary combustion chamber and sent to the exhaust port. .

  Patent Document 1 is one of the secondary combustion chamber systems. At the time of ignition, primary air is supplied to raise the temperature of the box, and when the temperature becomes high and the wood gas is separated, gas is supplied to the secondary combustion chamber. It is fed and burned with secondary air.

  In order to create combustion conditions, if a secondary combustion chamber is installed and maintained at a high temperature, the overall weight increases.

  Moreover, the secondary combustion chamber is maintained at a high temperature by the combustion promoting plate, and a heat-resistant material such as ceramic or heat-resistant brick can be used for the combustion promoting plate.

  In this way, as the combustion is expanded, the combustion promoting plate becomes red hot, so that the promoting plate catalyzes the combustion and maintains the secondary combustion chamber at a high temperature. Since there is no unburned residue, unburned black carbide is hardly mixed in the ash as in the conventional combustion apparatus, and the effect that the amount of ash is extremely small cannot be obtained.

  The object of the present invention is to eliminate the inconvenience of the conventional example, and to minimize the generation of smoke by adding a simple configuration as a chimney combustion auxiliary device without taking a complicated structure of providing a secondary combustion chamber. May provide a light and cheap wood stove that can be stopped.

In order to achieve the above object, the present invention is provided inside a stove body, and comprises a porous cylinder having a hole at the root of a chimney comprising an outer cylinder and an inner cylinder, and the aperture ratio of the hole is the outer cylinder. The gist is that the inner cylinder is increased to provide a double cylinder, and that the stove body is made of a steel plate, and the porous cylinder has a longer inner cylinder than the outer cylinder .

  According to the first aspect of the present invention, as a chimney combustion auxiliary device, by installing a porous cylindrical body as a heat storage member at the root of the chimney, the lower part of the chimney can be easily heated and the high temperature can be maintained. The temperature of the lower part (the chimney root) exceeds 150 degrees so that smoke does not come out.

  In addition, since the cylindrical body is porous, it is possible to suppress the resistance of smoke discharge to the chimney.

  Furthermore, the temperature rise at the root of the chimney can be accelerated due to the double structure.

According to the second aspect of the present invention, since the stove body is made of a steel plate, it can be made light and inexpensive. Since the inner cylinder is longer than the outer cylinder, not only is it difficult to emit smoke, but also the combustion efficiency is improved.

  As described above, the soot stove of the present invention can minimize the generation of smoke by adding a simple structure as a chimney combustion auxiliary device without taking a complicated structure of providing a secondary combustion chamber. Lightweight and inexpensive.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 4 to 7 are explanatory views showing the embodiment of the present invention, FIG. 2 is a plan view of the same, and the stove main body 10 of the wood stove will be described first. As shown, the bottom is a dome-shaped laterally mounted type, and is supported by a U-shaped leg 11 in the front-rear direction, and a heat shield 12 that is parallel to the bottom is spaced from the leg 11.

  Further, the upper surface of the stove body 10 is a flat upper floor plate, and an opening and a sliding door 13 are provided here to form a material input and an air intake port 14. In the figure, 13 a is a handle of the sliding door 13.

  Further, a chimney 15 is erected in the vicinity of the air intake port 14, and its lower end is opened inward of the stove body 10.

  The above is an example, and the shape of the stove body 10 is not limited to this, and various forms such as a vertical type can be adopted as well as a horizontal type.

  In the present invention, a porous cylinder 16 is installed in the stove body 10 as a heat storage member at the root of the chimney 15. The porous cylinder 16 has a double cylinder structure.

  11 and 12 show the porous cylindrical body 16, and FIGS. 13 and 14 show development views thereof.

  The porous cylinder 16 includes an outer cylinder 16a and an inner cylinder 16b. In the illustrated example, the aperture ratio of the hole 19 is 4.36% in the outer cylinder 16a in FIG. 13 and 4.92% in the inner cylinder 16b in FIG. is there.

  An attachment flange 17 is provided on the upper portion, and a fitting portion 18 is provided thereon, so that the fitting portion 18 can be fitted into the chimney 15.

  The inventor tried a demonstration experiment for pursuing an optimum structure capable of rapidly raising the temperature in the furnace and maintaining the high temperature.

  In the course of the experiment, we were able to find out that smoke did not come out when the temperature at the bottom of the chimney (chimney root) exceeded 150 degrees. That is, from the start of combustion (at the time of burning) until the temperature in the furnace rises to the end of combustion (at the time of extinction), smoke does not come out when the lower part of the chimney exceeds 150 degrees, and the temperature at the end of combustion reaches 150 degrees It was confirmed that smoke was generated when the temperature was lower than.

  Based on this, as a device that can easily raise the temperature of the lower part of the chimney 15 and maintain the high temperature, a member for storing heat is attached to the outlet of the smoke in the combustion furnace of the wood stove, that is, the root of the chimney 15. A cylinder was manufactured and installed.

  The reason for making it porous is to suppress the resistance of smoke emission to the chimney.

  In addition, the porous cylinder 16 is not limited to being a cylinder, and may be an elliptic cylinder or a square cylinder. The material is the same as that of the stove body 1 and is made of a steel plate, but is not limited thereto.

  1 and 3 to 5 show various types of porous cylinders 16, and the test results are shown in the following table. 1 shows a single porous cylinder 16 with a large diameter, FIG. 3 shows a single porous cylinder 16 with no large diameter, and FIG. 4 shows a double porous cylinder 16 with a double diameter. The difference in diameter between the outer cylinder and the inner cylinder is not so great. FIG. 5 shows a case where the porous cylinder 16 is doubled and the diameter difference between the outer cylinder and the inner cylinder is large.

In order to compare the generation of smoke, a type in which nothing was attached to the experimental furnace and a type in which various porous cylinders were attached were arranged side by side, and a combustion experiment was conducted and visually observed.

  Combustion experiment for improving the type of the above experiment No. 1 4) It was found that the size of the chimney smoke combustion auxiliary device of 4) in the previous section was effective, but for the improvement of this device, the outer cylinder・ I experimented on the burning celebration by changing the length of the inner column without changing the diameter.

In the case of FIG. 5, the length of the outer cylinder and the inner wound are the same, but FIG. 6 is a type with a long outer cylinder, and FIG. 7 is a type with a long inner cylinder. The temperature measurement place is shown in FIG.
The test results are shown in Table 2 below.

  In the combustion experiment, the remaining material and edge were used in the sawing to observe the state of smoke generation, but in the numerical combustion comparison experiment, the firewood used for combustion (conifers and hardwoods) has a moisture content and carbon content. Since there was too much variation, we purchased and used white briquettes (in order to align calories etc.).

  We measured the concentration of wood stove and chimney over time and tried to compare them. As a result, 6) it was found that the type with the long inner cylinder [FIG. 7] was the best, and it was proved that the provision of this device not only makes it difficult to emit smoke but also improves the combustion efficiency. (Temperature measurement location diagram: pay attention to the temperature rise and temperature holding state)

In the comparison experiment with other wood stoves, the white briquette was used for the demonstration of the performance of the “chimney smoke combustion auxiliary device” and a numerical experiment was conducted. As a comparison, the temperature measurement at various places was carried out by arranging three types of the porous cylinders “FIGS. 8 and 9” and the type with the combustion promoting plate as in Patent Document 1 [FIG. 10]. The smoke generation status was compared, and the test results are shown in Table 3 below.

The longest results were obtained with the wood stove of the present invention.
(Temperature measurement location diagram: pay attention to the temperature rise and temperature holding state)
* The difference in temperature distribution between the I and II experiments is thought to be due to different burner ignition conditions.

It is explanatory drawing which shows the 1st example of a wood stove as a comparison with the wood stove of this invention. It is a top view of the wood-burning stove of this invention and the wood-burning stove as a comparison. It is explanatory drawing which shows the 2nd example of a wood stove as a comparison with the wood stove of this invention. It is explanatory drawing which shows 1st Embodiment of the wood stove of this invention. It is explanatory drawing which shows 2nd Embodiment of the wood stove of this invention. It is explanatory drawing which shows 3rd Embodiment of the wood stove of this invention. It is explanatory drawing which shows 4th Embodiment of the wood stove of this invention. It is explanatory drawing which shows the 3rd example of a wood stove as a comparison with the wood stove of this invention. It is a top view which shows the 3rd example of a wood stove as a comparison with the wood stove of this invention. It is a top view which shows the 4th example of a wood stove as a comparison with the wood stove of this invention. It is a top view of the porous cylinder used with the wood stove of this invention. It is a side view of the porous cylinder used with the wood stove of this invention. It is an expanded view of the outer cylinder of the porous cylinder used with the wood stove of this invention. It is an expanded view of the inner cylinder of the porous cylinder used with the wood stove of this invention. It is explanatory drawing which shows the temperature measurement location of a wood stove. It is a vertical side view which shows a prior art example.

DESCRIPTION OF SYMBOLS 1 ... Combustion chamber 2 ... Lid 3 ... Pivoting part 4 ... Input port 5 ... Exhaust port 6 ... Combustion promotion board 6b ... Through-hole 7 ... Floor surface 8 ... Ash removal outlet 9 ... Chimney 10 ... Stove body 11 ... Leg 12 ... heat shield 13 ... sliding door 13a ... handle 14 ... air intake 15 ... chimney 16 ... porous cylinder 16a ... outer cylinder 16b ... inner cylinder 17 ... mounting flange 18 ... fitting part 19 ... hole

Claims (2)

It is installed inside the stove body, and a porous cylinder with holes at the root of the chimney consists of an outer cylinder and an inner cylinder. The hole opening ratio is doubled by increasing the inner cylinder more than the outer cylinder. A wood-burning stove characterized by being provided as a tube. The wood stove according to claim 1 , wherein the stove body is made of a steel plate, and the porous cylinder has a longer inner cylinder than the outer cylinder .

Images