JP2012241981A - Solid fuel combustion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To supply a wood chip manufactured by crushing wood materials such as woodland surplus materials, thinned woods, branches and lumber remainders in addition to wood pellets, to effectively supply combustion air even if lump fuel is stacked, and to replace a fire grate device according to a shape of the lump fuel in a solid fuel combustion device using a force of gravity or a gravity fall for supplying the lump fuel.SOLUTION: The solid fuel combustion device includes a combustion furnace 1, a fuel supplying device 2 for supplying the lump fuel by a force of gravity to a combustion chamber 11 of a combustion furnace 1, and a fire grate device 3 provided in the combustion chamber 11 of the combustion furnace 1. The fuel supplying device 2 includes a reservoir 20 and a stoppage door 210 for sealing a fuel delivery port of the reservoir 20. The fire grate device 3 is erected in a fuel support floor 30, and has an air supply tube 5 in which an appropriate number of air supply holes are formed at a cylinder wall. The fire grate device 3 can be carried in and out to and from the combustion furnace 1, and a tilted floor 32 or a horizontal floor is alternatively used as the fuel support floor 30.

Description

  The present invention relates to a combustion apparatus that uses gravity or natural fall for supplying bulk fuel, and more particularly, even when bulk fuel such as wood chips and wood pellets is stacked, it is effectively burned between the stacked bulk fuels. The present invention relates to a combustion apparatus in which air can be supplied and a grate apparatus can be replaced in accordance with the shape of the bulk fuel.

As biomass that contributes to the prevention of global warming and can be self-sufficient, wood biomass energy extracted from woody materials such as forest residue, thinned wood, branches and sawn timber is drawing attention.
Woody biomass energy includes wood chips and wood pellets.

Patent Document 1 below discloses a solid fuel stove that mainly uses gravity or natural fall for supplying wood pellets. The solid fuel stove described in Patent Document 1 uses wood pellets, wood chips, or coal as the solid fuel, and the solid fuel stove is installed in a place where power supply is restricted without using power for solid fuel supply and combustion. Is possible.
The solid fuel stove has a fuel adjustment mechanism capable of adjusting the amount of solid fuel supplied into the combustion chamber.

JP 2009-47360 A

  Patent Document 1 also mentions wood chips as solid fuel for the stove. However, unlike wood pellets, wood chips have poor uniformity in shape and therefore have low fluidity. Therefore, if the fuel adjustment mechanism is installed in the supply path, the wood chips cannot be supplied as a supply hindering factor. there is a possibility.

  Moreover, since the solid fuel stove described in Patent Document 1 has a curved shape in which the grate protrudes downward, so to speak, it has the shape of a container, so the solid fuel is piled up in the central portion of the grate. There is a problem that the combustion air is insufficient in the solid fuel piled up easily and it is difficult to continue the combustion.

(Object of the present invention)
Therefore, an object of the present invention is to crush wooden materials such as forest land residual materials, thinned wood, branches, and sawn timber, in addition to wood pellets, in a solid fuel combustion apparatus that uses gravity or natural fall for supplying bulk fuel. It is to enable supply of wood chips to be manufactured.
Another object of the present invention is to make it possible to supply combustion air effectively even when bulk fuel is stacked.
Furthermore, another object of the present invention is to make it possible to replace the grate apparatus in accordance with the shape of the bulk fuel.

Means taken by the present invention to solve the above problems are as follows.
A combustion furnace, a fuel supply device for supplying bulk fuel to the combustion chamber of the combustion furnace by gravity, a grate device installed in the combustion chamber of the combustion furnace, and a combustion gas generated in the combustion chamber A combustion device having a chimney or a flue,
The furnace wall of the combustion furnace is
An insertion port for inserting a supply part of the fuel supply device, and an entrance / exit with a door for carrying in or out a grate device installed in the combustion chamber,
The fuel supply device includes:
A storage section for storing bulk fuel, a closing door for sealing the fuel inlet of the storage section,
A supply section that is provided below the storage section and that is inserted into the insertion port of the combustion furnace and supplies a bulk fuel to the combustion chamber;
The grate device is
A fuel support floor, a supporting leg that supports the fuel support floor, and an appropriate number of air supply cylinders that are erected on the fuel support floor and in which an appropriate number of air supply holes are provided in the cylinder wall. And
The grate device can be carried into or out of the combustion furnace, and the insertion port for inserting the supply unit of the fuel supply device is formed larger than the outer shape of the supply unit, and the inserted supply unit and the insertion port In between, an air attracting part is formed,
Solid fuel combustion device.

The present invention
A combustion furnace, a fuel supply device for supplying bulk fuel to the combustion chamber of the combustion furnace by gravity, a grate device installed in the combustion chamber of the combustion furnace, and a combustion gas generated in the combustion chamber A combustion device having a chimney or a flue,
The furnace wall of the combustion furnace is
A first insertion port and a second insertion port for inserting the supply part of the fuel supply device, and an inlet / outlet with a door for carrying in or out a grate device installed in the combustion chamber,
The fuel supply device includes:
A storage section for storing bulk fuel, a closing door for sealing a fuel carry-in port of the storage section, and a first insertion port or a second insertion port of the combustion furnace, which are continuously provided below the storage unit. And a supply part for supplying the bulk fuel to the combustion chamber.
The grate device is
A fuel support floor, a supporting leg that supports the fuel support floor, and an appropriate number of air supply cylinders that are erected on the fuel support floor and in which an appropriate number of air supply holes are provided in the cylinder wall. And
The grate device can be carried into or out of the combustion furnace, and the first insertion port and the second insertion port for inserting the supply unit of the fuel supply device are formed larger than the outer shape of the supply unit, An air attracting part is formed between the inserted supply part and the insertion port.
Solid fuel combustion device.

  The solid fuel combustion apparatus has an inclined bed or a horizontal bed as a fuel support bed, and these are preferably used alternatively.

  The furnace wall of the combustion furnace of the solid fuel combustion apparatus is configured to carry in or out an object in a heating chamber defined in the combustion furnace, in addition to a first door provided with a first door. And a second doorway with a door.

  In the claims and the specification, the term “sealing” includes airtightness in a strict sense, combustion air enters the storage section, and bulk fuel that is stored or waiting in the storage section or supply section burns. It is used as including the case where the airtightness to the extent of hindering it can be secured.

(Function)
The operation of the solid fuel combustion apparatus according to the present invention will be described.
Open the door of the combustion furnace, carry the grate device into the combustion chamber, and install it in the combustion chamber.

  The fuel supply device inserts the distal end portion of the supply portion into the insertion port. After the combustion furnace is equipped with the fuel supply device, the bulk fuel is carried into the reservoir, and the fuel inlet is closed with a closed door so that air does not enter the reservoir from the fuel inlet.

  The bulk fuel in the reservoir flows downward due to gravity and enters the combustion chamber. The bulk fuel entering the combustion chamber is ignited by an appropriate method, and the bulk fuel is burned. When the bulk fuel burns out, it becomes ash and falls from the through hole of the fuel support floor, and when the bulk of the bulk fuel in the combustion chamber decreases, the bulk fuel is sequentially supplied from the storage portion side by gravity.

  The combustion gas generated by the combustion of the bulk fuel is discharged from the chimney, and the pressure in the combustion chamber is lowered due to the chimney effect when being discharged, so that air is attracted from the air attracting portion at a required flow rate. For this reason, the flame generated by the combustion of the bulk fuel moves in a direction away from the supply port at the tip of the supply unit. In addition, the atmosphere is cooled by the low-temperature outside air. These actions prevent burning of the bulk fuel waiting in the supply section.

Note that the bulk fuel that is burning in the combustion chamber to the bulk fuel that is waiting to be supplied in the reservoir is continuous to be supplied by gravity, and from the bulk fuel in the vicinity of the combustion chamber toward the bulk fuel in the reservoir. It is not without the possibility of spreading fire.
However, since the door is closed and is in an airtight state, the storage portion is short of combustion air and prevents the spread of fuel from the bulk fuel near the combustion chamber.

Unlike the reservoir, the first entrance and the first door are not sealed, so that the combustion air is introduced into the combustion chamber from the gap between the first entrance and the first door by the action of the chimney effect. Attracted.
Part of the combustion air attracted from the gap between the first doorway and the first door passes through the space below the fuel support floor, passes through the through hole of the fuel support floor, and passes through the air supply cylinder to the cylinder wall. The air supply holes are supplied to the combustion chamber.

From the air supply hole buried in the bulk fuel accumulated around the air supply cylinder, combustion air is sent into the accumulated bulk fuel (preferably radially), and the bulk fuel is burned efficiently. .
Of the air supply holes, those exposed above the bulk fuel are mixed with the air ejected from the air supply holes and the gas in which the bulk fuel is combusted, and the bulk fuel burns efficiently.

According to the present invention, wooden chips as well as wooden pellets can be supplied as a bulk fuel using gravity or natural fall.
Moreover, even if the bulk fuel is stacked, the combustion air can be supplied effectively.

  Further, those having at least two types of grate devices that match the characteristics of the bulk fuel can select a fuel support bed that matches the characteristics of the bulk fuel, so that combustion that is not limited or difficult to receive by the shape of the bulk fuel A device can be provided.

  When the bulk fuel is accumulated, the accumulated bulk fuel is in a state where the combustion air is insufficient. However, since the air supply cylinder is erected on the fuel support floor of the grate device, the combustion air is supplied to the bulk fuel from the air supply cylinder, and the combustion efficiency can be improved without using a blower or the like. it can. Therefore, it is suitable as a combustion device or a heating appliance when power is not supplied as in a disaster area.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front perspective view showing an embodiment of a solid fuel combustion apparatus according to the present invention, showing a state where a first door is opened. It is a perspective explanatory view of the back side of a solid fuel combustion device, and shows the state where the closed door of the fuel carry-in port is opened. It is AA cross-section explanatory drawing in FIG. 1 of the solid fuel combustion apparatus of the state which closed the 1st door. It is a perspective explanatory view of the grate device which has an inclined floor. FIG. 4 is a cross-sectional explanatory diagram corresponding to FIG. 3 of a solid fuel combustion apparatus provided with a horizontal floor.

The present invention will be described in detail based on the embodiments shown in the drawings.
As shown in FIGS. 1 to 3, the solid fuel combustion apparatus is installed in the combustion chamber 1, the fuel supply device 2 that supplies the bulk fuel F to the combustion chamber 11 of the combustion furnace 1 by gravity, and the combustion chamber 11. And a chimney 4 or a flue for discharging combustion gas generated in the combustion chamber 11.

  The combustion furnace 1 is constructed by, for example, a metal plate or casting, and includes a furnace wall 10 and a combustion chamber 11 surrounded by the furnace wall 10. The furnace wall 10 includes a peripheral wall 101, a top wall 102, and a bottom wall 103.

  On the back side of the peripheral wall 101 (on the right side in FIGS. 2, 3, and 5), there are a first insertion port 12 and a second insertion port 13 into which a supply unit 22 of the fuel supply device 2 described later is inserted. Either the first insertion port 12 or the second insertion port 13 is used, and the other insertion port that is not used is closed by a sliding insertion port closing door 17. The insertion port closing door 17 slides while being guided by guides provided above and below the edges of the first insertion port 12 and the second insertion port 13.

A first entrance 14 is provided below the front side of the peripheral wall 101 (on the right side in FIG. 1). The first inlet / outlet 14 is opened and closed when carrying in / out of the grate apparatus 3 installed in the combustion chamber 11, scraping out ash, or burning soot. The first doorway 14 includes a first door 140.
In addition, a second entrance 16 is provided above. The second inlet / outlet 16 is used when an object is carried into / out of the heating chamber 15 formed by partitioning the inside of the combustion chamber 11 with a partition plate 150. The second doorway 16 includes a second door 160.

The fuel supply device 2 includes a hopper 20 that is a storage unit that stores the bulk fuel F.
About half of the upper surface of the hopper 20 is closed by the closing plate 211, and the other half is the fuel carry-in port 21. A closing door 210 is attached to the edge of the fuel carry-in port 21 with a closing plate 211 via a hinge portion 212.

  The closing door 210 is configured so that, for example, a rubber packing is arranged on the periphery, and the fuel carry-in port 21 can be sealed in cooperation with the mouth of the fuel carry-in port 21 so that combustion air enters the hopper 20. Prevents the inside of the hopper from becoming airtight. Thereby, as will be described later, the bulk fuel in the hopper is prevented from being burned by the spread of fire from the bulk fuel burning in the combustion chamber.

A supply unit 22 that is inserted into the first insertion port 12 or the second insertion port 13 of the combustion furnace 1 and supplies the bulk fuel F into the combustion chamber 11 is continuously provided below the hopper 20. In the present embodiment, the supply unit 22 is formed in a cylindrical shape, and has a supply port 220 at the tip.
Supporting legs 23 and 23 for adjusting the heights of the hopper 20 and the supply unit 22 are provided on opposite side walls of the hopper 20. The support legs 23 and 23 have a structure in which tubes having different diameters are nested, and are provided with stabilizing plates 230 and 230 at the lower ends. The support legs 23, 23 can be held at a certain height by, for example, a fixing pin after the height is adjusted. As the structure of the support legs 23, 23, various known structures can be employed.

A grate device 3 is installed in the combustion chamber 11 of the combustion furnace 1.
The grate device 3 has a fuel support floor 30 that prevents the bulk fuel F from falling. The fuel support floor 30 has a large number of through holes 301. The through-hole 301 causes the ash after combustion of the bulk fuel F to fall, and takes combustion air into the combustion chamber 11 from the lower side of the fuel support floor 30.
Supporting legs 31, 31 that support the fuel support floor 30 are provided on both side edges of the fuel support floor 30. In the present embodiment, expanded metal is used for the fuel support floor 30. Moreover, although the support legs 31 and 31 are plate-shaped, a support | pillar shape may be sufficient.
The grate device 3 is separate from the combustion furnace 1, and can be carried into the combustion furnace 1 and taken out from the combustion furnace 1.

An air supply cylinder 5 is erected at a substantially central portion of the fuel support floor 30. The air supply cylinder 5 is open at the lower end and closed at the upper end by the closing plate 52. An appropriate number of air supply holes 51 are provided on the cylindrical wall 50 of the air supply cylinder 5 over the entire circumferential surface.
An appropriate number of air supply cylinders 5 are installed in consideration of installation conditions such as the size of the space portion of the combustion chamber 11 and the outer diameter of the air supply cylinder 5.

The first insertion port 12 and the second insertion port 13 into which the supply unit 22 of the fuel supply device 2 is inserted are formed larger than the outer shape of the supply unit 22, The air attraction part 6 is formed by the gap formed between the mouth edges of the insertion ports 12 and 13.
The area of the air attraction unit 6 (the area of the gap) is determined by the outer shape of the supply unit 22 and the diameters of the insertion ports 12 and 13. Moreover, if the area of the air attraction part 6 is large, the flow velocity of the air attracted will become slow, and if the area of the air attraction part 6 is small, the flow speed of the air attracted will become high.

  The shape of the air attraction unit 6 is determined by the positional relationship between the supply unit 22 and the insertion ports 12 and 13, and when the outer peripheral surface of the supply unit 22 does not contact any part of the edge of the insertion ports 12 and 13, It is formed in a frame shape. Depending on the manner of contact between the outer peripheral surface of the supply part 22 and the edge part of the insertion openings 12 and 13, it may be “L” or “U” shaped.

The grate device 3 has at least two types depending on the state of the floor surface of the fuel support floor 30. One is an inclined floor 32 having an inclined floor surface used for a wood chip, and the other is a horizontal floor 33 having a horizontal floor surface used for a wood pellet. The horizontal floor 33 is also used when burning soot.
The inclined floor 32 has a larger area than the horizontal floor 33 and has an effect of increasing the amount of combustion air flowing into the combustion chamber 11 from the fuel support floor 30.

  Since the wood chips are not uniform in shape and lack fluidity, the inclined bed 32 is selected so that it can be scattered over the entire surface of the fuel support bed 30. The wood chips lacking in fluidity supplied from the fuel supply device 2 slide or roll down on the inclined bed 32 and can be scattered throughout the inclined bed 32.

Since the wood pellets are manufactured industrially, the shape is basically constant, the fluidity is higher than that of the wood chips, and the shape is easy to roll, so the horizontal floor 33 is selected. The wood pellets supplied from the fuel supply device 2 roll on the floor surface of the horizontal floor 33 and are scattered throughout.
As described above, the grate device 3 is used alternatively by the supplied fuel.
In some cases, soot is burned directly into the combustion chamber 11 as fuel, and in this case, the horizontal floor 33 is used.

(Function)
The operation of the present embodiment will be described.
The fuel support floor 30 of the grate device 3 is selected by the difference in the bulk fuel F, thereby changing the height of the fuel supply device 2.

First, the case where the bulk fuel F is a wood chip will be described.
In the case of a wood chip, a grate device 3 having an inclined floor 32 is selected. The first door 140 of the combustion furnace 1 is opened and the grate device 3 is carried into the combustion chamber 11, the high end side H is set to the first insertion port 12 side, and the low end side L is set to the first entrance / exit port 14 side. Installed in the combustion chamber 11.

  The fuel supply device 2 sets the lengths of the support legs 23 and 23 so that the height of the distal end portion of the supply portion 22 can be inserted into the first insertion port 12, and the distal end portion of the supply portion 22 is set to the first portion. Is inserted into the insertion slot 12. After the combustion furnace 1 is equipped with the fuel supply device 2, a wood chip is carried into the hopper 20, the fuel carry-in port 21 is closed by the closing door 210, and air does not enter the hopper 20 from the fuel carry-in port 21. To do. The second insertion port 13 is closed by the insertion port closing door 17.

  The wood chip in the hopper 20 flows downward by gravity and enters the combustion chamber 11. The wood chip that has entered the combustion chamber 11 is ignited by an appropriate method to burn the wood chip. When the wood chip burns out, it becomes ash and falls from the through hole 301 of the fuel support floor 30, and when the wood chip in the combustion chamber 11 is reduced in volume, the wood chip is sequentially supplied from the hopper 20 side by gravity.

  The combustion gas generated by the combustion of the wood chip is discharged from the chimney 4, and the pressure in the combustion chamber 11 is lowered due to the chimney effect at the time of being discharged. Therefore, the air is attracted from the air induction section 6 with a required flow velocity. Is done. For this reason, the flame generated by the combustion of the wood chip moves in a direction away from the supply port 220 at the tip of the supply unit 22. In addition, the atmosphere is cooled by the low-temperature outside air. By these actions, the wood chip waiting in the supply unit 22 is prevented from burning.

Note that the wood chips burning in the combustion chamber 11 to the wood chips waiting in the hopper 20 are continuously supplied by gravity, and the wood chips in the hopper 20 from the wood chips in the vicinity of the combustion chamber 11 side. Try to spread the fire toward the chip.
However, since the closed door 210 is closed and the inside of the hopper 20 is in an airtight state, the combustion air is insufficient, and the fire spread from the wood chip near the combustion chamber 11 side is prevented.

  Since the space between the first doorway 14 and the first door 140 is not hermetically sealed, the combustion air flows into the combustion chamber 11 from the gap between the first doorway 14 and the first door 140 due to the action of the chimney effect. Attracted by Part of the combustion air attracted from the gap between the first doorway 14 and the first door 140 passes through the space between the fuel support floor 30 and the bottom wall 103 and passes through the through hole 301 of the fuel support floor 30. It is supplied into the combustion chamber 11. Further, the air is supplied from the air supply hole 51 of the cylinder wall 50 into the combustion chamber 11 through the air supply cylinder 5.

Wood chips are accumulated around the air supply cylinder 5, and combustion air is sent radially from the air supply holes 51 buried in the wood chips into the accumulated wood chips. Burn well.
Of the air supply holes 51 that are exposed above the wood chips, the air blown out from the air supply holes 51 and the gas generated by combusting the wood chips are mixed to efficiently burn the wood chips.

Next, a case where the bulk fuel F is a wood pellet will be described.
A grate device 3 having a horizontal floor 33 is selected, and the first door 140 is opened, carried into the combustion chamber 11, and installed in the combustion chamber 11.

The fuel supply device 2 adjusts the height of the support legs 23 and 23 so that the height of the tip of the supply unit 22 can be inserted into the second insertion port 13, and the supply unit 22 is changed to the second insertion port 13. insert. At this time, the first insertion hole 12 is closed by the insertion port closing door 17.
Since the situation after ignition is almost the same as in the case of wood chips, the above explanation is used.

  Note that the terms and expressions used in this specification are merely explanatory and are not limiting at all, and terms and expressions equivalent to the features described in this specification and parts thereof. There is no intention to exclude. It goes without saying that various modifications are possible within the scope of the technical idea of the present invention.

F Bulk fuel 1 Combustion furnace 10 Furnace wall 101 Perimeter wall 102 Top wall 103 Bottom wall 11 Combustion chamber 12 First insertion port 13 Second insertion port 14 First doorway 140 First door 15 Heating chamber 150 Partition plate 16 First 2 door 160 second door 17 insertion port closing door 2 fuel supply device 20 hopper 21 fuel carry-in port 210 closing door 211 closing plate 212 hinge portion 22 supply portion 220 supply port 23 support leg 230 stabilizer plate 3 grate device 30 fuel support Floor 301 Through-hole 31 Support leg 32 Inclined floor 33 Horizontal floor 4 Chimney 5 Air supply cylinder 50 Cylinder wall 51 Air supply hole 52 Blocking plate 6 Air attracting part H High end side L Low end side

Claims (4)

A combustion furnace (1),
A fuel supply device (2) for supplying bulk fuel (F) by gravity to the combustion chamber (11) of the combustion furnace (1);
A grate device (3) installed in the combustion chamber (11) of the combustion furnace (1);
A combustion device having a chimney (4) or a flue for discharging combustion gas generated in the combustion chamber (11),
The furnace wall (10) of the combustion furnace (1),
Insertion ports (12, 13) for inserting the supply section (22) of the fuel supply device (2);
An entrance / exit (14) having a door (140) for carrying in or out a grate device (3) installed in the combustion chamber (11);
Have
The fuel supply device (2)
A reservoir (20) for storing bulk fuel; and
A closing door (210) for sealing the fuel inlet (21) of the reservoir (20);
A supply unit (22) that is provided below the storage unit (20), and that is inserted into the insertion ports (12, 13) of the combustion furnace (1) and supplies the bulk fuel to the combustion chamber (11); ,
Have
The grate device (3)
A fuel support floor (30);
A support leg (31) for supporting the fuel support floor (30);
An appropriate number of air supply cylinders (5) which are erected on the fuel support floor (30) and have an appropriate number of air supply holes (51) provided in the cylinder wall (50);
Have
The grate device (3) can be carried into or out of the combustion furnace (1),
The insertion ports (12, 13) for inserting the supply portion (22) of the fuel supply device (2) are formed larger than the outer shape of the supply portion (22), and the inserted supply portion (22) and the insertion port (12) , 13), an air attracting part (6) is formed,
Solid fuel combustion device. A combustion furnace (1),
A fuel supply device (2) for supplying bulk fuel (F) by gravity to the combustion chamber (11) of the combustion furnace (1);
A grate device (3) installed in the combustion chamber (11) of the combustion furnace (1);
A combustion device having a chimney (4) or a flue for discharging combustion gas generated in the combustion chamber (11),
The furnace wall (10) of the combustion furnace (1),
A first insertion port (12) and a second insertion port (13) for inserting the supply section (22) of the fuel supply device (2);
An entrance / exit (14) having a door (140) for carrying in or out a grate device (3) installed in the combustion chamber (11);
Have
The fuel supply device (2)
A reservoir (20) for storing bulk fuel; and
A closing door (210) for sealing the fuel inlet (21) of the reservoir (20);
It is continuously provided under the storage part (20), and is inserted into the first insertion port (12) or the second insertion port (13) of the combustion furnace (1) to form a lump in the combustion chamber (11). A supply section (22) for supplying fuel;
Have
The grate device (3)
A fuel support floor (30);
A support leg (31) for supporting the fuel support floor (30);
An appropriate number of air supply cylinders (5) which are erected on the fuel support floor (30) and have an appropriate number of air supply holes (51) provided in the cylinder wall (50);
Have
The grate device (3) can be carried into or out of the combustion furnace (1),
The first insertion port (12) and the second insertion port (13) into which the supply unit (22) of the fuel supply device (2) is inserted are formed larger than the outer shape of the supply unit (22) and are inserted. An air attraction part (6) is formed between the part (22) and the first insertion port (12) and the second insertion port (13).
Solid fuel combustion device. The fuel support floor (30) has an inclined floor (32) or a horizontal floor (33), which are used alternatively.
The solid fuel combustion apparatus according to claim 1 or 2. The furnace wall (10) of the combustion furnace (1)
In addition to the 1st entrance / exit (14) provided with the 1st door (140), the 2nd door which carries an object in or out of the heating chamber (15) divided in the said combustion furnace (1). A second doorway (16) with (160);
The solid fuel combustion apparatus according to claim 1, 2, or 3.

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