JP7153399B2 - Combustion device - Google Patents

Description

The present invention relates to combustion devices. More specifically, it relates to a combustion apparatus that uses wood solids such as wood chips and wood pellets as fuel.

It is known that in a combustion apparatus that burns woody solids as fuel, discharging ash after combustion from the combustion section is a condition for sustaining efficient combustion. Patent Documents 1 and 2 each disclose a method of removing ash from a combustion section in a combustion apparatus that burns solid wood fuel.
The gist of the combustion device described in Patent Document 1 is that a plurality of slits are arranged in the combustion dish, the uneven part of the rotating member having unevenness is passed through the slits, and the ash is deposited in the ash collection container below the combustion dish. It is disclosed as a wood pellet combustion device.
The combustion apparatus described in Patent Document 2 includes an ash scraping member provided with a plurality of blades on the outer peripheral surface and exposed from the slit plate by rotation to scrape the ash on the fire grate, and an ash scraping member that engages with the blades and is driven to rotate to remove the ash. It is disclosed as a wood pellet combustion apparatus comprising an auxiliary ash scraping member for transporting the ash and an ash disposal box having an outlet for discharging the ash into an ash collection container.

JP 2006-266546 A Japanese Patent Application Laid-Open No. 2006-200825

The wood pellet combustion apparatus described in Patent Document 1 has the following structure: "A vertical slit 27 on the front surface of the combustion dish 13, a horizontal slit 26 on the bottom surface, and a vertical slit 27 on the rear surface are connected in the front-rear direction with the same opening width. Rotating shaft 40 is positioned at a position where uneven portion 39 of rotating member 38 of rotating member 38 of ash removing means 28 provided inside combustion box 37 below 13 passes through horizontal slit 26 and vertical slits 27 on either one or both of the front and rear surfaces. is provided.” (see the column of paragraph [0037] of Patent Document 1). Although this wood pellet combustion apparatus can remove ash from the slit portion, there is a problem that ash on the combustion tray other than the slit portion cannot be removed. Also, when collecting the ash deposited on the lower ash collection container, it is necessary to open the combustion section. Therefore, it is necessary to stop the combustion device, and there is a problem that the combustion device cannot be operated continuously.

The wood pellet combustion apparatus described in Patent Document 2 is described as follows: "When the ash collection container 14 is filled with ash, a freely openable door (not shown) provided on the front side of the frame 2 of the combustion apparatus 1 is opened. In this case, the peripheral wall portion 24a of the ash disposal box 24 and the vane plate 25b of the auxiliary scraping member 25 are made a small gap to keep the burner portion 12 airtight. Since it is held, vaporized gas at the time of ignition is prevented from flowing out from the lower part of the burner body 17, and combustion flame is prevented from blowing downward from the lower part of the burner body 17 during main combustion or ash treatment. can be performed.” (see the column of paragraph [0076] of Patent Document 2).
However, when the ash generated from the combustion part is deposited in the ash collection container located below the combustion part, the ash itself is hot, so it is said that caution is required when disposing of the ash in the ash collection container. There's a problem.

Therefore, the present invention has been made by paying attention to the above problems, and aims to efficiently drop the ash on the combustion part, stabilize the combustion of the solid fuel, and transfer the ash to a position away from the combustion chamber. To provide a combustion apparatus capable of efficiently recovering ash at a low temperature and capable of continuous operation.

In order to achieve the above object, one aspect of the present invention provides a combustion chamber and a plurality of slits provided in the lower part of the combustion chamber for dropping burned ash downward and supplying air, A combustion part for placing and burning fuel, and a combustion part are a first fire grate that is arranged to be inclined, and a first fire grate that is inclined and arranged to face the first grate and are provided in the lower part of the combustion chamber. and a second fire grate that can be moved up and down by the ash discharge part, and the combustion chamber is fixed and arranged below the second fire grate so as to pass through a slit provided in the second fire grate. an ash scraping member for dropping ash on the grate and between the slits, and an ash discharge part is provided below the combustion part and is rotationally driven by the driving device to transfer the fallen ash to the outside of the combustion chamber. The gist of the present invention is a combustion device in which a second fire grate is vertically moved by rotation of a rotary shaft, and the rotary shaft is intermittently operated so as to periodically repeat driving and stopping.

According to the present invention, the ash can be efficiently collected by efficiently dropping the ash on the combustion part, stabilizing the combustion of the solid fuel, and transferring the ash to a position away from the combustion chamber. It is possible to provide a combustion device that can be operated in

BRIEF DESCRIPTION OF THE DRAWINGS It is front sectional drawing which cut the combustion apparatus which concerns on embodiment of this invention. FIG. 2 is a cross-sectional plan view of the combustion apparatus according to the embodiment of the present invention taken along line AA in FIG. 1 and enlarging a combustion chamber, an ash discharge section, and a heat exchange section; FIG. 2 is a side cross-sectional view taken along line BB in FIG. 1 of the combustion apparatus according to the embodiment of the present invention; FIG. 3 is an enlarged plan cross-sectional view of the combustion chamber in FIG. 2 of the combustion device according to the embodiment of the present invention; FIG. 2 is a side cross-sectional view taken along line CC in FIG. 1 of the combustion apparatus according to the embodiment of the present invention; BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which showed the state just before the 2nd fire grate of the combustion apparatus which concerns on embodiment of this invention moves upwards, (a) is sectional drawing which expanded the combustion part in FIG. 1, (b) is a figure. 1 is an enlarged cross-sectional view of a combustion part and an ash discharge part taken along line CC in FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which showed the state which the 2nd fire grate of the combustion apparatus which concerns on embodiment of this invention reached the highest position, (a) is sectional drawing which expanded the combustion part in FIG. 1, (b) is FIG. 2 is an enlarged cross-sectional view of the combustion part and the ash discharge part taken along line CC in FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which showed the state immediately after the 2nd fire grate of the combustion apparatus which concerns on embodiment of this invention reached the lowest point, (a) is sectional drawing which expanded the combustion part in FIG. 1, (b) 2 is a sectional view taken along line CC in FIG. 1 and enlarging a combustion portion and an ash discharge portion; FIG. FIG. 2 is an explanatory diagram showing a state in which the second fire grate of the combustion apparatus according to the first modification of the embodiment of the present invention has reached its highest position, and is an enlarged cross-sectional view of the combustion portion in FIG. 1 . FIG. 2 is an explanatory diagram showing a state in which the second fire grate of the combustion apparatus according to the second modification of the embodiment of the present invention has reached its highest position, and is an enlarged cross-sectional view of the combustion portion in FIG. 1 .

An embodiment of the present invention will now be described with reference to the drawings. In the following description of the drawings, the same or similar parts may be given the same or similar reference numerals. However, the drawings are schematic, and the relationship with the dimensions of each part may differ from the actual one.
Also, the technical idea of the present invention can be modified in various ways within the technical scope defined by the claims.

A combustion apparatus 1 of the present invention shown in FIGS. . A solid fuel F such as wood chips and pellets stored in the fuel storage part 2 is sent to a combustion chamber 4 on the side of the fuel supply part 3 via the fuel supply part 3 located below the fuel storage part 2 and burned. Combustion takes place with air supplied from the combustion air supply 6 . The gas that has been heated to a high temperature by burning the solid fuel F in the combustion chamber 4 is sent to the heat exchange section 7 adjacent to the combustion chamber 4 and is exhausted to the outside of the combustion device 1 after heat exchange. Ash is generated when the solid fuel F is burned in the combustion chamber 4 . The ash after incineration is discharged to the outside of the combustion chamber 4 by an ash discharge section 5 located at the lower portion of the combustion chamber 4, and then collected by an operator. Arrows drawn in the combustion chamber 4, the combustion air supply section 6, and the heat exchange section 7 in FIGS. 1 to 8 indicate the flow of combustion air and combustion gas after combustion.

The fuel reservoir 2 shown in FIG. 1 has a fuel tank 21 . A solid fuel F is stored inside the fuel tank 21 . A fuel drop port 22 is positioned at the bottom of the fuel tank 21 . The solid fuel F is dropped downward from the fuel drop port 22 and supplied to the fuel supply section 3 which will be described later. A raking blade 23 is provided at the bottom of the fuel tank 21 . The raking blade 23 rakes out the solid fuel F in the fuel tank 21 and sends the solid fuel F to the fuel drop port 22 by being rotationally driven around a rotating shaft that rotates in the vertical direction. A hot air outlet 24 is provided around the fuel tank 21 so that hot air can be discharged into the fuel tank 21 . The solid fuel F in the fuel tank 21 can be kept dry by blowing hot air from the hot air outlet 24 .

A fuel supply unit 3 is positioned below the fuel drop port 22 . The fuel supply section 3 has a first transport section 311 , a paddle section 321 and a second transport section 331 .
The solid fuel F sent from the fuel drop port 22 is sent to the cylindrical first conveying portion 311 located below the fuel drop port 22 . A first carry-in port 312 is provided at one end of the first transport portion 311 and connected to the lower portion of the fuel drop port 22 of the fuel tank 21 . A discharge port 313 is provided at the other end of the first transport portion 311 with its opening directed downward. A first screw 314 is provided inside the first conveying portion 311 in the longitudinal direction. The first screw 314 is a rotary shaft having a helical member, and by being rotationally driven, feeds out the solid fuel F introduced into the first carry-in port 312 to the discharge port 313 . The solid fuel F dropped from the fuel drop port 22 is conveyed to the discharge port 313 by the first screw 314 and then sent to the paddle portion 321 located below the discharge port 313 .

The paddle portion 321 is a member in which the blade plates 322 are arranged radially with respect to the rotation shaft, and is provided in the middle of the path of the discharge port 313 . The paddle part 321 is driven to rotate, and intermittently closes the path of the discharge port 313 with the blade plate 322 . The solid fuel F is intermittently supplied by the paddle part 321 to the second conveying part 331 below the discharge port 313, and the smoke and hot air from the combustion chamber 4, which will be described later, is transferred to the upstream side of the fuel supply part 3 and the fuel storage part. prevent flow to 2.

The second conveying part 331 is a cylindrical member. A second carry-in port 332 is located at one end of the second transport portion 331 so as to open toward the paddle portion 321 . The second carry-in port 332 guides the solid fuel F into the second transport section 331 . At the other end of the second conveying portion 331, a fuel supply port 333 is provided to supply the solid fuel F to the combustion portion 42 provided in the combustion chamber 4, which will be described later. A second screw 334 is provided inside the second conveying portion 331 in the longitudinal direction. The second screw 334 is a rotary shaft having a helical member, and is driven to rotate to supply the solid fuel F from the second carry-in port 332 to the fuel supply port 333 .

Here, driving of the first screw 314, the paddle portion 321, and the second screw 334 will be described.
The first screw 314 , paddle portion 321 and second screw 334 are rotationally driven by a motor 341 . The motor 341 is fixed to the end of the second screw 334 on the side of the second inlet 332 and drives the second screw 334 to rotate. A first sprocket 342 is fixed to the motor-side end of the second screw 334 . Further, a second sprocket 343 is provided on the axis of the paddle portion 321 and positioned above the first sprocket 342 . A first chain 344 is wound around the first sprocket 342 and the second sprocket 343, and the paddle part 321 is rotationally driven.
A third sprocket 345 is fixed coaxially to the second sprocket 343 . Furthermore, a fourth sprocket 346 is fixed to the upper portion of the third sprocket 345 at the axial end of the first screw 314 on the first carry-in port 312 side. A second chain 347 is wound around the third sprocket 345 and the fourth sprocket 346 so that the first screw 314 can be rotated together with the rotation of the paddle portion 321 . The solid fuel F is supplied into the combustion chamber 4 by the rotationally driven first screw 314 , paddle portion 321 and second screw 334 .

The combustion chamber 4 is positioned to the side of the fuel storage portion 2 and the fuel supply portion 3, and is provided in the shape of a rectangular parallelepiped with its long sides set vertically. Refractory bricks 41 are arranged so as to cover the inside of the lower portion of the combustion chamber 4 . Below the refractory bricks 41 in the lower part of the combustion chamber 4, there is provided a combustion part 42 in which a solid fuel F such as wood chips or pellets is placed and burned. The solid fuel F is supplied from a fuel supply port 333 installed at one end of the combustor 42 having a V-shaped cross section shown in FIG. The combustion portion 42 has a plate-like member that is inclined in a V-shape and faces each other, and the valley line is oriented parallel to the fuel supply port 333 . A plate-like member inclined in a V-shape is called a fire grate, and the fire grate is composed of a first fire grate 421 arranged in a fixed position and a second fire grate 421 provided movably in the vertical direction. There are 422.

The first fire grates 421 are arranged on both left and right sides along the direction in which the solid fuel F is conveyed by the second screw 334 and are provided with a plurality of circular holes 423 and a plurality of first slits 424 . In this embodiment, the hole 423 is provided on the fuel supply port 333 side. The hole 423 is provided smaller than the solid fuel F to prevent the solid fuel F from dropping. Furthermore, since the holes 423 facilitate the passage of air from below, the air required for combustion can pass over the first fire grate 421 . A plurality of first slits 424 are provided along the slope of the first fire grate 421 adjacent to the holes 423 . The first slit 424 makes it easier for the ash after the combustion of the solid fuel F to fall downward, and allows the air necessary for combustion to pass over the first fire grate 421 from below.

Further, the first fire grate 421 on the right side along the conveying direction of the solid fuel F can be turned by operating an operation lever (not shown) outside the combustion chamber 4 via a link 425 . As for the turning, it is possible to make the surface of the first fire grate 421 hang down by turning downward with a turning fulcrum shaft 426 at the top of the first fire grate 421 as a fulcrum. The downward turning motion of the first fire grate 421 can easily discharge ash and unburned solid fuel F downward, and maintenance of the combustion chamber 4 and the combustion section 42 is facilitated. In addition, the first fire grate 421 on the left side along the transport direction is a fixed slope. When the first fire grate 421 on one side is turned so that the surface hangs down, the lower part of the slope is opened and the ash easily slides down.

A second fire grate 422 is provided adjacent to the first fire grate 421 so as to extend the surface of the first fire grate 421 . In the embodiment shown in FIGS. 1 to 10, the first fire grate 421 on the left side of the supply direction of the solid fuel F is shortened, and the second fire grate 422 is arranged so as to extend the shortened surface. A plate surface of the second fire grate 422 is provided with a plurality of second slits 427 along the inclination. The second slit 427 makes it easier for the ash to fall downward and allows the air necessary for combustion to pass over the first grate 421 .

The solid fuel F conveyed and supplied onto the V-shaped combustion section 42 formed by the first fire grate 421 and the second fire grate 422 is supplied with air through the holes 423 , the first slits 424 and the second slits 427 . Burn. The solid fuel F that is burning above the hole 423 moves gradually onto the first slit 424 so as to be pushed out by the solid fuel F that is supplied from the fuel supply port 333 at any time. The solid fuel F that has been burned as it moves turns to ash, and is pushed by the unburned solid fuel F conveyed from the fuel supply port 333 to drop from the first slit 424 and the second slit 427 .

A contact member 429 is fixed downward from the lower surface of the second fire grate 422 . The contact member 429 is a rectangular plate-like member, and is arranged with its plate surface directed parallel to the rotation axis of the second screw. A lower end portion of the contact member 429 on the side of the fuel supply port 333 is largely chamfered to form an edge 429 . The contact member 429 moves the second fire grate 422 vertically by allowing the rotation of the discharge screw 52 provided in the ash discharge section 5 to be described later to follow the edge 429 . A method of operating the vertical movement will be described later. The upward movement of the second fire grate 422 creates a space in the V-shaped troughs of the first fire grate 421 and the second fire grate 422, and the ash falls down from the space. In addition, the vertical movement of the second fire grate 422 forces the ash remaining on the second fire grate 422 without dropping to drop from the space or the second slit 427 .

A plurality of ash scraping members 430 are provided so as to penetrate the second slits 427 . The ash scraping member 430 is fixed in the combustion chamber 4 by being positioned below the second fire grate 422 with a rod-like member. In the embodiment, the ash scraping members 430 are oriented horizontally, and two or three are arranged in the vertical direction. A line segment connecting the tips of the ash scraping members 430 arranged in the vertical direction is set parallel to the surface of the inclined second fire grate 422 . The ash scraping member 430 forcibly scrapes off the ash clogged in the second slit 427 of the vertically moving second fire grate 422 or solidified ash. By removing the ash on the second fire grate 422 and in the second slit 427, it is possible to sufficiently secure the air supplied to the combustion part 42 through the second slit 427, and the solid fuel F is stably burned. can be maintained. The ash dropped from the combustion section 42 is dropped into the ash discharge section 5. - 特許庁

The ash discharge part 5 is located below the combustion part 42 and discharges the ash to the outside of the combustion chamber 4 after receiving the ash dropped from the combustion part 41 . Ash accumulates in an ash tray 51 located below the combustion section 42 . A bent portion 511 is provided in the central portion of the ash tray 51 . The side of the ash tray 51 away from the fuel discharge port 333 is bent so as to be raised. A trough line of bending of the bent portion 511 is perpendicular to the rotation axis of the second screw 334 . A discharge screw 52 is provided above the bent portion 511 along the valley line.

The discharge screw 52 is positioned below the first slit 424 and the second slit 427 and the contact member 428 and is oriented perpendicular to the axis of rotation of the second screw 334 . The discharge screw 52 is a member in which a spiral blade 522 is wound around a rotary shaft 521, and conveys the ash on the ash tray 51 to the outside of the combustion chamber 4 by rotating it. The discharge screw 52 is rotated by a discharge motor 53 which is a driving device installed outside the combustion chamber 4 . The output shaft of the discharge motor 53 is fixed to the discharge screw 52 and rotates the discharge screw 52 at 2 to 5 revolutions per minute. In this embodiment, it is set to 3 revolutions per minute.

The discharge screw 52 is controlled to operate intermittently, and periodically repeats driving and stopping. In an embodiment, the discharge screw 52 is driven for 5 minutes every 30 minutes. This periodical drive reduces the power consumption compared to the constant rotation method, contributing to energy saving.

The discharge screw 52 allows the ash on the ash tray 51 to be transported to a collection container 55 through a discharge pipe 54 leading to the exterior of the combustion chamber 4 . The ash collected in the collection container 55 installed outside the combustion chamber 4 is sufficiently cooled while being transported through the long discharge pipe 54 by the discharge screw 52 . The cooled ash is discharged into a collection container 55 located below the end of the discharge screw 52 in the ash conveying direction. The collecting container 55 containing the ash can be easily taken out by the operator, and the ash is collected and discarded.

The spiral blade 522 of the discharge screw 52 is provided with a pushing member 56 that enables the above-described second fire grate 422 to move up and down. The pushing member 56 is a round bar, and is fixed in parallel with the rotating shaft 521 so as to span the spiral blades 522 positioned below the combustion section 42 . The outer diameter of the pushing member 56 provided between the spiral blades 522 is set so as to be inscribed in the rotation outer diameter of the spiral blades 522 . In this embodiment, the pushing member 56 is fixed over two winding pitches of the spiral blade 522 . The pushing member 56 rotates about the rotating shaft 521 together with the rotation of the discharge screw 52 . In the embodiment, the direction of rotation of the discharge screw 52 is counterclockwise rotation from the combustion section 42 toward the output shaft of the discharge motor 53 .

When the position of the contact member 428 positioned above the rotating shaft 521 rises relative to the rotating shaft 521 due to the rotation of the pushing member 56, the contact member 428 comes into contact with the edge 429 and is pushed upward. As the contact member 428 rises, the second grate 422 securing the contact member 428 also rises. Furthermore, as the discharge screw 52 continues to rotate, the pushing member 56 is lowered relative to the rotating shaft 521 . At the same time, the contact member 428 that abuts against the pushing member 56 also descends and returns to its original position.

The vertical movement of the second fire grate 422 will be described in detail with reference to FIGS.
FIG. 6 shows the state immediately before the second fire grate 422 rises. As the discharge screw 52 rotates, the push member 56 on the side of the discharge motor 53 comes into contact with the edge 429 below the contact member 428 . Further rotation of the discharge screw 52 pushes up the second fire grate 422 to the highest position.
FIG. 7 illustrates a state in which the pushing member 56 has reached the vicinity of the highest position, and the edge 429 at the lower end of the contact member 428 is at the same height as the upper end of the rotating outer diameter of the spiral blade 522 . As the discharge screw 52 rotates further, the edge 429 below the contact member 428 shifts from the pushing member 56 to the outer peripheral end surface of the spiral blade 522 . The end edge 429 comes into contact with the outer peripheral end face of the spiral blade 522 from the pushing member 56 on the discharge motor 53 side. When the discharge screw 52 is further rotated, the end surface of the spiral blade 522 is transferred to the next pushing member 56 on the side of the combustion section 42 .

When the discharge screw 52 is further rotated, as shown in FIG. 8, the pushing member 56 descends while coming into contact with the chamfer provided on the end edge 429 . As the pushing member 56 descends, the contact member 428 and the second fire grate 422 also descend. Pusher member 56 causes apparent contact member 428 to climb over helical vane 522 . By repeating the states of FIGS. 6 to 8, the second fire grate 422 can reciprocate in the vertical direction, the second fire grate 422 is shaken, and the ash deposited on the upper surface falls.
In addition, since the vertical movement of the second fire grate 422 directly utilizes the rotation of the discharge screw 52 of the ash discharge unit 5, no dedicated power or transmission device is required.

The second fire grate 422 can move smoothly in the vertical direction without falling down due to the ash scraping member 430 passed through the second slit 427 . Since the second slit 427 provided in the second fire grate 422 also moves up and down, the ash scraping member 430 scrapes off the ash sticking to the inside of the second slit 427 . In addition, the diameter of the bar of the ash scraping member 430 is set slightly smaller than the width of the second slit 427 so as not to hinder the vertical movement of the second fire grate 422 and suitable for scraping off the ash inside the second slit 427. is. In addition, the ash deposited on the second fire grate 422 due to the vertical movement is shaken and falls from the second slit 427, or slides down the inclined surface of the second fire grate 422, and the valley of the combustion part 42 deposited on The ash accumulated in the valley of the combustion section 42 falls from the space created under the first fire grate 421 when the second fire grate 422 rises next time. The ash attached to the second fire grate 422 continues to be periodically removed by the vertical movement of the second fire grate 422 and the ash scraping member 430 . In addition, the second slit 427 is not clogged with ash, and the air required for combustion of the solid fuel F can sufficiently pass through, thereby stabilizing the combustion of the solid fuel F on the combustion section 42 .

A combustion air supply section 6 is provided in the combustion chamber 4 for supplying the air necessary for burning the solid fuel F. As shown in FIG. The combustion air supply section 6 has a first combustion air supply section 61, a second combustion air supply section 62, a transfer section air supply section 63, and a heater blowing air supply section 64, each having a pipe shape. Become. The combustion air supply section 6 takes in air by an intake fan 65 and blows it, and is branched at a branch 66 to form a first combustion air supply section 61, a second combustion air supply section 62, a transfer section air supply section 63, and a heater blower. Air is blown into the air supply section 64 .

The first combustion air supply part 61 extends below the combustion part 42 and has a plurality of blowout ports 611 directed toward the combustion part 42 . Air supplied from the intake fan 44 from the blowout port 611 is blown toward the solid fuel F side through the holes 423 and the first slits 424 and the second slits 427 of the combustor 42 . The solid fuel F on the combustion section 42 obtains air supplied from the first combustion air supply section 61 and undergoes primary combustion. The solid fuel F after the primary combustion obtains secondary combustion air and undergoes secondary combustion.

A second combustion air supply section 62 that supplies secondary combustion air blows air supplied from the intake fan 44 into the combustion chamber 4 from a side surface above the upper surface of the combustion section 42 . In the embodiment, the second combustion air supply part 62 in the combustion chamber is a channel arranged in a U shape, and air is blown in through holes 621 provided in the upper part and the side of the channel. By further sending air from the second combustion air supply part 62 to the solid fuel F that has undergone the primary combustion, secondary combustion is promoted and the solid fuel F is efficiently burned.

The solid fuel F on the combustion section 42 is ignited by the hot air supplied from the heater blowing air supply section 63 . The heater-blowing air supply unit 63 has an ignition heater 631 in the vicinity of the conduit outlet. The ignition heater 631 heats the air sent from the intake fan 65 to a high temperature and blows the heated air onto the solid fuel F, thereby igniting the solid fuel F.
The conveying part air supply part 64 prevents backflow of combustion air generated in the combustion chamber 4 by ejecting the solid fuel F from the paddle part 321 of the fuel supply part 3 in the conveying direction.

Combustion gas, which is heated to a high temperature by burning the solid fuel F in the combustion chamber 4 , moves to the heat exchange section 7 adjacent to the combustion chamber 4 . The heat exchange section 7 has a cylindrical smoke pipe 71 provided on the side of the combustion chamber 4, a liquid chamber 74 positioned around the combustion chamber 4 and the smoke pipe 71, and a chimney 72 for exhausting combustion gas. .

The smoke pipe 71 consists of a pipe, and a plurality of smoke pipes 71 are installed in the vertical direction through the inside of the liquid chamber 74 , and the combustion gas passes through the inside of the smoke pipe 71 . The smoke pipe 71 consists of an input side smoke pipe 711 through which the combustion gas passes downward from the upper part of the combustion chamber 4, and an exhaust side smoke pipe 712 through which the combustion gas that has passed downward passes upward on the discharge side.

A plurality of input side smoke pipes 711 and discharge side smoke pipes 712 are provided. The input side smoke pipe 711 and the discharge side smoke pipe 712 are collected to form a group. Therefore, ventilation of combustion gas is less likely to be disturbed. The hot combustion gas exchanges heat with the liquid chamber 53 by passing through the smoke pipe 71 . The inside of the liquid chamber 53 is filled with the liquid L. As shown in FIG. Although water is stored in the embodiment, other liquids may be used. High-temperature combustion gas generated from the combustion chamber 4 exchanges heat with the liquid L in the liquid chamber 53 through the input side smoke pipe 711 and the discharge side smoke pipe 712 . After the heat exchange, the liquid L is in a heated state, and as the solid fuel F continues to burn in the combustion section 4, the temperature of the liquid L in the liquid chamber 53 rises. The liquid L in the liquid chamber 53 can be taken out by connecting a pipe to the liquid chamber 53, and the heat can be effectively used. After the heat exchange, the combustion gas loses heat and becomes cooled, and is exhausted from the chimney 72 .

A helical member 75 is inserted into the smoke tube 71 in order to make the heat exchange more efficient. The helical member 75 is formed by molding a strip-shaped metal plate or bar-shaped member into a helical shape. The combustion gas travels in the smoke pipe 71 while swirling along the helical member 75, so that the travel distance of the combustion gas increases. The helical member 75 prevents the combustion gas from passing straight through the smoke pipe 71 , so that the heat of the combustion gas can be effectively transferred from the smoke pipe 71 to the liquid L in the liquid chamber 53 .

The higher the temperature of combustion gas, the better the efficiency of heat exchange, and it is important to perform efficient combustion in order to obtain high-temperature combustion gas. The combustion section 42 and the ash discharge section 5 of the present invention make it possible to continue to feed the solid fuel F with air from the first combustion air supply section for primary combustion. By removing the ash on the second fire grate 422 and the ash in the second slit 427, the air blown from the primary combustion air supply part passes through the second slit 427 without being blocked by the ash and reaches the solid fuel F. Sent. By intermittently moving the second fire grate 422 up and down, the supply of air to the solid fuel F promotes efficient combustion and continuous stable combustion.
In addition, the ash after combustion is transported outside the combustion chamber 4 by the ash discharge unit 5 , so that the ash is cooled during transport and collected in a collection container outside the combustion chamber 4 . As a result, the ash can be easily taken out even when the combustion device 1, especially the combustion chamber 4, is in operation, and the ash can be efficiently collected without stopping the continuous operation.

It has been described above that removing the ash on the combustion section 42 enhances the combustion efficiency, but a modification that can remove the ash on the combustion section 42 more efficiently will be described.
A first modification of the embodiment shown in FIG. 9 has an edge 429a that is formed by gouging the fuel supply port 333 side of the lower end of the contact member 428a into a large step. After the second fire grate 422 reaches the highest position, the discharge screw 52 continues to rotate, causing the contact member 428a in contact with the pushing member 56 to suddenly drop due to the stepped edge 429a. The fall is a free fall, and the ash on the second fire grate 422 falls downward due to impact when it falls back to its original position. In addition, the ash stuck in the second slit 427 can be dropped by the impact of dropping the second fire grate 422 .

In a second modification of the embodiment shown in FIG. 10, the fuel supply port 333 side of the lower end of the contact member 428b is provided with a stepped edge 429b. After the second fire grate 422 reaches the highest position, the discharge screw 52 is further rotated, so that the contact member 428b in contact with the pushing member 56 drops stepwise by the stepped edge 429b. The gradual fall is a free fall, and the ash on the second fire grate 422 falls downward with the impact of the fall. In addition, the ash stuck in the second slit 427 can be dropped by the gradual drop impact of the second fire grate 422 .

With the combustion device 1 configured as described above, the ash on the combustion section 42 is efficiently removed to stabilize the combustion of the solid fuel, and the ash after combustion is transferred to a position away from the combustion chamber 4, thereby improving efficiency. It is possible to provide a combustion apparatus 1 capable of recovering ash effectively and capable of continuous operation.

Although the present invention has been described by the above embodiments, the statements and drawings forming part of this disclosure should not be understood to limit the present invention. Modifications of the embodiments, examples and operational techniques based on this disclosure will be apparent to those skilled in the art.

1 Combustion Device 2 Fuel Storage Portion 3 Fuel Supply Portion 333 Fuel Supply Port 4 Combustion Chamber 42 Combustion Portion 421 First Fire Grate 422 Second Fire Grate 424 First Slit 426 Rotation Support Shaft 427 Second Slit 428 Contact Member 430 Ash Scraping Member 5 Ash discharge part 52 Discharge screw 521 Rotating shaft 522 Spiral blade 56 Extruding member 6 Combustion air supply part 7 Heat exchange part F Solid fuel

Claims (3)

a combustion chamber;
a combustion part provided in the lower part of the combustion chamber, having a plurality of slits for dropping the burned ash downward and supplying air, and for placing and burning solid fuel;
The combustion part is movable up and down by a first fire grate arranged in an inclined manner, and an ash discharge part arranged in an inclined manner facing the first fire grate and provided in the lower part of the combustion chamber. a second grate,
The combustion chamber is fixedly arranged below the second fire grate so as to pass through the slit provided in the second fire grate, and an ash scraper for dropping ash on the second fire grate and between the slits comprising a member and
The ash discharge part is provided below the combustion part, and moves the second fire grate up and down by rotation of a rotating shaft that is rotationally driven by a driving device to transfer the fallen ash to the outside of the combustion chamber,
The rotating shaft performs intermittent operation so as to periodically repeat driving and stopping,
A combustion device characterized by: The driving time of the rotating shaft in the intermittent operation is performed for 5 minutes every 30 minutes,
The combustion device according to claim 1, characterized in that: The rotating shaft is driven to rotate at 2 to 5 rotations per minute,
3. The combustion device according to claim 1 or 2, characterized in that:

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