JP2019190769A - Combustion device - Google Patents

Abstract

To provide a combustion device which enables a continuous operation by efficiently falling the ash above a combustion part to efficiently collect the ash by transporting the ash at a position distant from a combustion chamber.SOLUTION: A combustion part 42 is provided at a lower part of a combustion chamber 4, and includes a plurality of slits 427 for falling the burned ash downward and supplying air, on which a solid fuel is placed for combustion. The combustion part 42 includes: a first fire grade 421 placed in an inclined manner; and a second fire grade 422 placed in an inclined manner and vertically movable by an ash transport part. An ash discharging part 5 that can vertically move the second fire grade 422, includes: an ash scraping member 430 which is provided so as to penetrate through the slit 427 formed on the second fire grade 422 for falling the ash between the second fire grade 422 and the slit 427; and a rotational shaft 521 which is provided below the combustion part 42 and rotationally driven by a drive device 53 for transporting the fallen ash to outside the combustion chamber 4.SELECTED DRAWING: Figure 5

Description

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

A combustion apparatus that burns wood solids as fuel is known as a condition for maintaining efficient combustion by discharging ash after combustion from a combustion section. Patent Document 1 and Patent Document 2 are disclosed as methods for removing ash from a combustion part in a combustion apparatus for burning a solid wood fuel.
The gist of the combustion apparatus described in Patent Document 1 is that a plurality of slit portions are arranged in a combustion dish, and the concave and convex portions of a rotating member having concaves and convexes are passed through the slits and deposited in an ash collection container below the combustion dish. It is disclosed as a wood pellet combustion apparatus.
The combustion apparatus described in Patent Document 2 is provided with a plurality of blades on the outer peripheral surface, and is exposed from the slit plate by rotation and scrapes the ash on the grate, and engages with the blades and rotates to drive the ash. It is disclosed as a wood pellet combustion apparatus having a gist of providing an auxiliary ash scraping member to be transferred and an ash treatment box provided with a discharge port and discharging ash into an ash collection container.

JP 2006-266546 A JP 2006-200825 A

  The wood pellet combustion apparatus disclosed in Patent Document 1 states that “a vertical slit 27 on the front surface, a horizontal slit 26 on the bottom surface, and a vertical slit 27 on the rear surface are connected to the combustion plate 13 with the same opening width in the front-rear direction. The rotating shaft 40 is located at a position where the uneven portion 39 of the rotating member 38 of the ash removing means 28 provided inside the combustion box 37 passes through the horizontal slit 26 and one or both of the vertical slits 27 on the front and rear surfaces. (See paragraph [0037] of Patent Document 1). Although this wood pellet combustion apparatus can remove the ash in the slit portion, there is a problem that the ash on the combustion dish other than the slit portion cannot be removed. Moreover, when collecting the ash deposited on the lower ash collection container, it is necessary to release the combustion section. For this reason, it is necessary to stop a combustion apparatus, and there exists a problem which cannot operate a combustion apparatus continuously.

The wood pellet combustion apparatus described in Patent Document 2 states that “when the ash is filled in the ash collection container 14, an openable / closable 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 processing box 24 and the blade plate 25b of the auxiliary scraping member 25 are made a small gap to make the burner portion 12 airtight. Since it holds, vaporized gas at the time of ignition flows out from the lower part of the burner body 17 and prevents the combustion flame from blowing out from the lower part of the burner body 17 during the main combustion or ash treatment. (See paragraph [0076] of Patent Document 2).
However, if the ash generated from the combustion section is deposited in an ash collection container located below the combustion section, the ash itself is at a high temperature. There's a problem.

  Therefore, the present invention has been made with the above problems in mind, and it is possible to efficiently drop the ash on the combustion section to stabilize the combustion of the solid fuel and transfer the ash to a position away from the combustion chamber. It is an object of the present invention to provide a combustion apparatus that can efficiently recover ash and can be operated continuously.

  In order to achieve the above object, one aspect of the present invention includes a combustion chamber and a plurality of slits provided in a lower portion of the combustion chamber for dropping the burned ash downward and supplying air. A combustion section for placing and burning solid fuel, the combustion section includes a first grate arranged at an incline, a second grate arranged at an incline and movable up and down by an ash transport unit, and An ash scraping member for dropping the ash on the second grate and between the slits, and a ash scraping member disposed below the combustion unit, and transferring the dropped ash to the outside of the combustion chamber. Therefore, the gist of the present invention is a combustion apparatus that includes a rotation shaft that is rotationally driven by a drive device and includes an ash discharger that can move the second grate up and down.

  According to the present invention, the ash on the combustion part is efficiently dropped to stabilize the combustion of the solid fuel, and the ash can be efficiently recovered by transferring the ash to a position away from the combustion chamber. It is possible to provide a combustion apparatus that can be operated.

It is front sectional drawing which carried out the cross section of 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. It is side surface sectional drawing which cut | disconnected BB in FIG. 1 of the combustion apparatus which concerns on embodiment of this invention. It is the plane sectional view which expanded the combustion chamber in Drawing 2 of the combustion device concerning the embodiment of the present invention. FIG. 2 is a side cross-sectional view taken along the 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 grate of the combustion apparatus which concerns on embodiment of this invention moves upwards, (a) is sectional drawing to which the combustion part in FIG. 1 was expanded, (b) is a figure. 1 is a cross-sectional view taken along the line CC in 1 and in which a combustion part and an ash discharge part are enlarged. BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which showed the state which the 2nd 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. FIG. 6 is a cross-sectional view taken along a line C-C in which a combustion part and an ash discharge part are enlarged. It is explanatory drawing which showed the state immediately after the 2nd grate of the combustion apparatus which concerns on embodiment of this invention reached the lowest point, (a) is sectional drawing to which the combustion part in FIG. 1 was expanded, (b) FIG. 3 is a sectional view taken along the line CC in FIG. 1 and in which a combustion part and an ash discharge part are enlarged. It is explanatory drawing which showed the state which the 2nd grate of the combustion apparatus which concerns on the 1st modification of embodiment of this invention reached the highest position, and is sectional drawing to which the combustion part in FIG. 1 was expanded. It is explanatory drawing which showed the state which the 2nd grate of the combustion apparatus which concerns on the 2nd modification of embodiment of this invention reached the highest position, and is sectional drawing to which the combustion part in FIG. 1 was expanded.

Next, an embodiment of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts may be denoted by 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.
The technical idea of the present invention can be variously modified within the technical scope defined by the claims set forth in the claims.

  1 to 8 includes a fuel storage unit 2, a fuel supply unit 3, a combustion chamber 4, an ash discharge unit 5, a combustion air supply unit 6, and a heat exchange unit 7. . The solid fuel F such as wood chips and pellets stored in the fuel storage unit 2 is sent to the combustion chamber 4 on the side of the fuel supply unit 3 through the fuel supply unit 3 located below the fuel storage unit 2 for combustion. Combustion is performed by obtaining air supplied from the combustion air supply unit 6. The gas heated to a high temperature by burning the solid fuel F in the combustion chamber 4 is sent to the heat exchanging unit 7 adjacent to the combustion chamber 4 and is then exhausted to the outside of the combustion apparatus 1 after heat exchange. When solid fuel F is burned in the combustion chamber 4, ash is generated. The incinerated ash is discharged to the outside of the combustion chamber 4 by the ash discharge section 5 located at the lower portion of the combustion chamber 4 and then collected by the operator. The arrows drawn in the combustion chamber 4, the combustion air supply unit 6, and the heat exchange unit 7 in FIGS. 1 to 8 indicate the combustion air and the flow of combustion gas after combustion.

  The fuel storage unit 2 shown in FIG. Solid fuel F is accommodated in the fuel tank 21. A fuel dropping port 22 is located below the fuel tank 21. The solid fuel F is dropped downward from the fuel dropping port 22 and supplied to the fuel supply unit 3 described later. A scraping blade 23 is provided at the lower portion of the fuel tank 21. The scraping blade 23 is driven to rotate about a rotating shaft that rotates in the vertical direction, thereby scraping the solid fuel F in the fuel tank 21 and sending it to the fuel dropping port 22. A hot air blowing port 24 is provided around the fuel tank 21 so that the hot air can be discharged into the fuel tank 21. When the warm air is emitted from the warm air outlet 24, the solid fuel F in the fuel tank 21 can be kept dry.

The fuel supply unit 3 is located below the fuel dropping port 22. The fuel supply unit 3 includes a first transport unit 311, a paddle unit 321, and a second transport unit 331.
The solid fuel F sent from the fuel dropping port 22 is sent to a first conveying unit 311 having a cylindrical shape located below the fuel dropping port 22. A first carry-in port 312 is provided at one end of the first transfer unit 311, and is connected to the lower part of the fuel dropping port 22 of the fuel tank 21. A discharge port 313 is provided at the other end of the first transport unit 311 with the opening facing downward. A first screw 314 is provided inside the first transport unit 311 in the longitudinal direction. The first screw 314 is a rotating shaft having a spiral member, and sends the solid fuel F introduced into the first carry-in port 312 to the discharge port 313 by being driven to rotate. The solid fuel F dropped from the fuel dropping 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 blades 322 are arranged radially with respect to the rotation axis, and is provided in the middle of the path of the discharge port 313. The paddle part 321 is driven to rotate, and the path of the discharge port 313 is intermittently blocked by the blades 322. The paddle unit 321 intermittently supplies the solid fuel F to the second transport unit 331 below the discharge port 313, and smoke and hot air from the combustion chamber 4 to be described later on the upstream side of the fuel supply unit 3 and the fuel storage unit. 2 is prevented from flowing.

  The second transport unit 331 is a cylindrical member. A second carry-in port 332 provided so as to open toward the paddle part 321 is located at one end of the second transport part 331. The second carry-in port 332 guides the solid fuel F into the second transport unit 331. At the other end of the second transport unit 331, a fuel supply port 333 serving as a portion for supplying the solid fuel F to the combustion unit 42 provided in the combustion chamber 4 described later is provided. A second screw 334 is provided inside the second transport unit 331 in the longitudinal direction. The second screw 334 is a rotating shaft having a spiral member and supplies the solid fuel F from the second carry-in port 332 to the fuel supply port 333 by being driven to rotate.

Here, driving of the first screw 314, the paddle part 321, and the second screw 334 will be described.
The first screw 314, the paddle part 321, and the 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 second carry-in port 332 side, and rotates the second screw 334. A first sprocket 342 is fixed to the end of the second screw 334 on the motor side. Further, a second sprocket 343 is provided on the axis of the paddle portion 321, and is 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 portion 321 is rotationally driven.
A third sprocket 345 is fixed on the same axis as the second sprocket 343. Further, a fourth sprocket 346 is fixed to the upper end of the third sprocket 345 at the shaft 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, and the first screw 314 can be driven to rotate along with the rotation of the paddle part 321. The solid fuel F is supplied into the combustion chamber 4 by the first screw 314, the paddle portion 321, and the second screw 334 that are driven to rotate.

  The combustion chamber 4 is located on the side of the fuel storage unit 2 and the fuel supply unit 3 and is provided in a box shape with a rectangular parallelepiped shape with long sides standing in the vertical direction. A refractory brick 41 is arranged so as to cover the inside of the lower part of the combustion chamber 4. Below the refractory brick 41 in the lower part of the combustion chamber 4, there is provided a combustion part 42 for placing and burning solid fuel F such as wood chips or pellets. The solid fuel F is supplied from the fuel supply port 333 installed on one end side of the combustion unit 42 arranged in a V-shaped cross section shown in FIG. 5 and pushed out onto the combustion unit 42. The combustion unit 42 has a plate-like member inclined in a V-shape so as to face each other, and a valley line is directed parallel to the fuel supply port 333. A plate-like member inclined in a V shape is called a grate, and the grate has a first grate 421 arranged at a fixed position and a second grate provided so as to be movable in the vertical direction. There are 422.

  The first grate 421 is disposed on the left and right sides along the direction in which the solid fuel F is conveyed by the second screw 334, and is 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 smaller than the solid fuel F and prevents the solid fuel F from falling. Furthermore, since the hole 423 facilitates the passage of air from below, air necessary for combustion can be passed over the first grate 421. A plurality of first slits 424 are provided along the inclination of the first grate 421 adjacent to the hole 423. The first slit 424 makes it easy for the ash after burning of the solid fuel F to fall downward, and allows air necessary for combustion to pass over the first grate 421 from below.

  Further, the first 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 the link 425. The swivel can be swung downward with the swivel fulcrum shaft 426 at the top of the first grate 421 as a fulcrum, so that the surface of the first grate 421 hangs down. The downward swiveling operation of the first grate 421 can easily discharge the ash and the unburned solid fuel F downward, and the maintenance of the combustion chamber 4 and the combustion unit 42 is facilitated. Further, the first grate 421 on the left side along the transport direction is a fixed slope. When one of the first grate 421 is swung and the surface hangs down, the lower part of the slope is opened and the ash easily slides down.

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

  The solid fuel F conveyed and supplied onto the combustion part 42 formed in a V shape by the first grate 421 and the second grate 422 is supplied with air from the hole 423, the first slit 424, and the second slit 427. Burn. The solid fuel F that is burning on the hole 423 is gradually moved onto the first slit 424 so as to be pushed out by the solid fuel F supplied from the fuel supply port 333 as needed. The solid fuel F burned with the movement becomes ash and is pushed by the unburned solid fuel F conveyed from the fuel supply port 333 and falls from the first slit 424 and the second slit 427.

  A contact member 429 is fixed downward from a lower surface located at the lower part of the second grate 422. The contact member 429 is a rectangular plate-like member and is arranged with the plate surface parallel to the rotation axis of the second screw. A lower end portion of the contact member 429 on the fuel supply port 333 side is largely chamfered to form an end edge 429. The contact member 429 moves the second grate 422 in the vertical direction by causing the rotation of the discharge screw 52 provided in the ash discharge unit 5 described later along the edge 429. The operation method of the vertical movement will be described later. Due to the upward movement of the second grate 422, a space is created in the V-shaped valleys of the first grate 421 and the second grate 422, and ashes fall out from the space. Further, the vertical movement of the second grate 422 forcibly shakes the ash remaining on the second grate 422 without falling, and drops it from the space or the second slit 427.

  A plurality of ash scraping members 430 are provided so as to penetrate the second slit 427. The ash scraping member 430 is a rod-like member and is positioned below the second grate 422 and is fixed in the combustion chamber 4. In the embodiment, two or three ash scraping members 430 are arranged in the vertical direction in the horizontal direction. Moreover, the line segment which connected each front-end | tip of the ash scraping member 430 arrange | positioned to the perpendicular direction is set in parallel with the surface of the inclined 2nd grate 422. FIG. The ash scraping member 430 forcibly scrapes off the ash clogged or solidified ash in the second slit 427 of the second grate 422 that moves up and down. By removing the ash in the second grate 422 and in the second slit 427, sufficient air can be secured to be supplied to the combustion unit 42 through the second slit 427, and the solid fuel F is stably burned. Can be maintained. The ash that has fallen from the combustion unit 42 is dropped to the ash discharge unit 5.

  The ash discharge unit 5 is located below the combustion unit 42 and receives the ash dropped from the combustion unit 41 and then discharges it to the outside of the combustion chamber 4. Ashes accumulate on an ash tray 51 located below the combustion section 42. A bent portion 511 is provided at the center of the ash tray 51. The ash tray 51 is bent so as to raise the surface on the side away from the fuel discharge port 333. A valley line of bending of the bent portion 511 is a direction orthogonal to the rotation axis of the second screw 334. A discharge screw 52 is provided along the valley line above the bent portion 511.

  The discharge screw 52 is positioned below the first slit 424, the second slit 427, and the contact member 428, and is oriented in a direction orthogonal to the rotation axis of the second screw 334. The discharge screw 52 is a member in which the spiral blade 522 is wound around the rotation shaft 521, and conveys the ash on the ash receiving tray 51 to the outside of the combustion chamber 4 by rotating. 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 rotationally drives the discharge screw 52 at 2 to 5 rotations per minute. In this embodiment, it is set to 3 rotations per minute.

  The discharge screw 52 is controlled to be intermittently operated, and is periodically driven and stopped. In an embodiment, the discharge screw 52 is driven every 30 minutes for 5 minutes. By this regular driving, less electric power is used than the constantly rotating method, which can contribute to energy saving.

  The ash on the ash receiving tray 51 can be transferred to the recovery container 55 through the discharge pipe 54 communicating with the outside of the combustion chamber 4 by the discharge screw 52. The ash collected in the collection container 55 installed outside the combustion chamber 4 is sufficiently cooled during the transfer of the discharge pipe 54 set long 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 conveyance direction. The collection container 55 containing ash can be easily taken out by an operator, and the ash is collected and discarded.

  The spiral blade 522 of the discharge screw 52 is provided with an extrusion member 56 that allows the second grate 422 to move up and down. The push-out member 56 is a round bar, and is fixed so as to span a spiral blade 522 positioned below the combustion unit 42 in parallel with the rotation shaft 521. The outer diameter of the pushing member 56 provided between the spiral blades 522 is set so as to be inscribed in the rotational outer diameter of the spiral blade 522. In this embodiment, the pushing member 56 is fixed over two pitches of the winding pitch of the spiral blade 522. The pushing member 56 rotates around the rotation shaft 521 along with the rotation of the discharge screw 52. In the embodiment, the rotation direction of the discharge screw 52 is a left rotation from the combustion unit 42 toward the output shaft of the discharge motor 53.

  When the position of the contact member 428 located above the rotation shaft 521 rises relative to the rotation shaft 521 by the rotation of the push-out 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 that fixes the contact member 428 also rises. Furthermore, when the discharge screw 52 continues to rotate, the position of the pushing member 56 is lowered relative to the rotating shaft 521. At the same time, the contact member 428 in contact with the pushing member 56 is also lowered and returned to the original position.

The vertical movement of the second grate 422 will be described in detail with reference to FIGS.
FIG. 6 shows a state immediately before the second grate 422 is raised. As the discharge screw 52 rotates, the pushing member 56 on the discharge motor 53 side comes into contact with the edge 429 below the contact member 428. Furthermore, when the discharge screw 52 rotates, the second grate 422 is pushed up 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 has the same height as the upper end of the rotating outer diameter of the spiral blade 522. When the rotation of the discharge screw 52 further proceeds, the end edge 429 below the contact member 428 is transferred 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 surface of the spiral blade 522 from the pushing member 56 on the discharge motor 53 side. When the discharge screw 52 is further rotated, it moves from the end face of the spiral blade 522 to the pushing member 56 on the next combustion unit 42 side.

When the discharge screw 52 is further rotated, as shown in FIG. 8, the push-out member 56 descends while coming into contact with the chamfered portion provided on the end edge 429. As the push member 56 is lowered, the contact member 428 and the second grate 422 are also lowered. The pushing member 56 causes the apparent contact member 428 to move over the spiral blade 522. By repeating the states of FIGS. 6 to 8, the second grate 422 can reciprocate in the vertical direction, and the second grate 422 is shaken and the ash deposited on the upper surface falls.
Further, since the vertical movement of the second grate 422 directly uses the rotation of the discharge screw 52 of the ash discharge unit 5, no dedicated power and transmission device are required.

  The second grate 422 can move smoothly in the vertical direction without falling down by the ash scraping member 430 passed through the second slit 427. Since the second slit 427 provided in the second grate 422 also moves up and down, the ash scraping member 430 scrapes off the ash stuck inside the second slit 427. Further, the diameter of the rod of the ash scraping member 430 is set to be slightly smaller than the width of the second slit 427, and does not hinder the vertical movement of the second grate 422, and is suitable for scraping off the ash inside the second slit 427. It is. Further, the ash deposited on the second grate 422 by the vertical movement is shaken and falls from the second slit 427 or slides down the inclined surface of the second grate 422, and the valley portion of the combustion unit 42. To deposit. The ash deposited in the valleys of the combustion part 42 falls from the space formed between the lower part of the first grate 421 when the second grate 422 next rises. Due to the vertical movement of the second grate 422 and the ash scraping member 430, the ash attached to the second grate 422 continues to be periodically dropped. Further, the solid fuel F can sufficiently pass the air necessary for combustion without clogging the second slit 427 with ash, and the combustion of the solid fuel F on the combustion unit 42 is stabilized.

  In the combustion chamber 4, a combustion air supply unit 6 for sending air necessary for burning the solid fuel F is provided. The combustion air supply unit 6 includes a first combustion air supply unit 61, a second combustion air supply unit 62, a transport unit air supply unit 63, and a heater blower air supply unit 64. Become. The combustion air supply unit 6 takes in air by the intake fan 65 and blows air. Air is blown into the air supply unit 64.

  The first combustion air supply unit 61 extends to the lower side of the combustion unit 42, and a plurality of opening ports 611 are opened toward the combustion unit 42. Air supplied from the intake fan 44 from the blowout port 611 is blown toward the solid fuel F side through the hole 423, the first slit 424, and the second slit 427 of the combustion unit 42. The solid fuel F on the combustion unit 42 obtains air supplied from the first combustion air supply unit 61 and performs primary combustion. The solid fuel F after the primary combustion obtains the second combustion air and performs the secondary combustion.

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

The solid fuel F on the combustion unit 42 is ignited by hot air supplied from the heater blowing air supply unit 63. The heater blowing air supply unit 63 includes an ignition heater 631 in the vicinity of the pipe 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, whereby the solid fuel F is ignited.
The conveyance unit air supply unit 64 prevents the backflow of the combustion air generated in the combustion chamber 4 by ejecting the paddle unit 321 of the fuel supply unit 3 in the conveyance direction of the solid fuel F.

  The combustion gas 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 unit 7 includes 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 that exhausts combustion gas. .

  The smoke pipe 71 is a pipe, and a plurality of smoke pipes 71 are installed in the vertical direction through the liquid chamber 74, and the combustion gas passes through the smoke pipe 71. The smoke pipe 71 includes 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 passed downward passes upward on the discharge side.

  A plurality of input side smoke tubes 711 and a plurality of discharge side smoke tubes 712 are provided. The input side smoke pipe 711 and the discharge side smoke pipe 712 are collected to form a group. For this reason, the ventilation of the combustion gas is not easily disturbed. The combustion gas that has reached a high temperature passes through the smoke pipe 71 and exchanges heat with the liquid chamber 53. The liquid chamber 53 is filled with the liquid L. In the embodiment, water is stored, but other liquids may be used. The high-temperature combustion gas generated from the combustion chamber 4 exchanges heat with the liquid L in the liquid chamber 53 via the input-side smoke tube 711 and the discharge-side smoke tube 712. The liquid L after the heat exchange is in a heated state, and when the combustion of the solid fuel F is continued in the combustion unit 4, the liquid L in the liquid chamber 53 becomes high temperature. The liquid L in the liquid chamber 53 can be taken out by connecting a pipe to the liquid chamber 53, and heat can be used effectively. The combustion gas after the heat exchange is cooled by being deprived of heat and exhausted from the chimney 72.

  In order to make heat exchange more efficient, a spiral member 75 is inserted into the smoke pipe 71. The spiral member 75 is formed by spirally forming a metal strip or rod. The combustion gas moves in the smoke pipe 71 while swirling along the spiral member 75, and the movement distance of the combustion gas is extended. Since the combustion gas does not pass through the smoke pipe 71 in a straight line by the spiral member 75, the heat of the combustion gas can be effectively transmitted from the smoke pipe 71 to the liquid L in the liquid chamber 53.

The higher the temperature of the combustion gas, the higher the efficiency of heat exchange. In order to obtain a high-temperature combustion gas, it is important to perform efficient combustion. The combustion unit 42 and the ash discharge unit 5 of the present invention can continue to send air from the first combustion air supply unit for primary combustion to the solid fuel F. By dropping the ash on the second grate 422 and the ash in the second slit 427, the air blown from the primary combustion air supply unit passes through the second slit 427 to the solid fuel F without being blocked by the ash. Sent. By intermittently moving the second grate 422 up and down intermittently, the supply of air to the solid fuel F promotes efficient combustion and continuous stable combustion.
Further, by transferring the ash after combustion to the outside of the combustion chamber 4 by the ash discharging unit 5, the ash is cooled during the transfer and collected in a recovery container outside the combustion chamber 4. As a result, the ash can be easily taken out even when the combustion apparatus 1, particularly the combustion chamber 4 is in operation, and an efficient ash recovery operation can be performed without stopping the continuous operation.

As described above, removing the ash on the combustion unit 42 increases the combustion efficiency. However, a modified example in which the ash on the combustion unit 42 can be removed more efficiently will be described.
The first modified example of the embodiment shown in FIG. 9 is provided with an edge 429a that is formed so as to have a large step shape on the fuel supply port 333 side at the lower end portion of the contact member 428a. After the second grate 422 reaches the highest position, the rotation of the discharge screw 52 further proceeds, so that the contact member 428a that has been in contact with the pushing member 56 is suddenly dropped by the stepped edge 429a. The fall is a free fall, and the ash on the second grate 422 falls downward due to the impact when it falls to its original position. Further, the ash stuck in the second slit 427 can be dropped by the drop impact of the second grate 422.

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

  The combustion apparatus 1 configured as described above efficiently drops the ash on the combustion unit 42 to stabilize the combustion of the solid fuel, and transfers the ash after combustion to a position away from the combustion chamber 4. Thus, it is possible to provide the combustion apparatus 1 that can collect ash and can be operated continuously.

  Although the present invention has been described according to the above-described embodiments, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. Modifications to the embodiments, examples, and operation techniques based on this disclosure are obvious to those skilled in the art.

DESCRIPTION OF SYMBOLS 1 Combustion apparatus 2 Fuel storage part 3 Fuel supply part 333 Fuel supply port 4 Combustion chamber 42 Combustion part 421 1st grate 422 2nd grate 424 1st slit 426 Swivel fulcrum shaft 427 2nd slit 428 Contact member 430 Ash scraping member DESCRIPTION OF SYMBOLS 5 Ash discharge part 52 Discharge screw 521 Rotating shaft 522 Spiral blade 56 Extrusion member 6 Combustion air supply part 7 Heat exchange part F Solid fuel

Claims (8)

A combustion chamber;
A combustion section provided at a lower portion 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 a first grate arranged at an inclination, a second grate arranged at an inclination and movable up and down by the ash transport part,
An ash scraping member disposed so as to penetrate through the slit provided in the second grate, and dropping ash on the second grate and between the slits;
An ash discharge unit provided below the combustion unit, having a rotation shaft that is rotated by a driving device to transfer the dropped ash to the outside of the combustion chamber, and capable of moving the second grate up and down; ,
A combustion apparatus comprising: The ash discharge part is a spiral blade provided around the rotating shaft;
The combustion apparatus according to claim 1, further comprising: An extruding member provided in parallel with the rotation axis and moving the second grate up and down;
The combustion apparatus according to claim 1, further comprising: A contact member attached to the second grate, in contact with the ash discharge part, and for vertically moving the second grate by rotation of the ash discharge part;
The combustion apparatus according to any one of claims 1 to 3, further comprising: The vertical movement of the second grate is provided with a free fall section,
The combustion apparatus according to any one of claims 1 to 4, wherein The first grate is provided opposite to the second grate, and a turning fulcrum shaft capable of turning operation with one end as a fulcrum;
The combustion apparatus according to any one of claims 1 to 5, further comprising: The combustion chamber is provided with a combustion air supply section for blowing air,
The combustion air supply unit is a first combustion air supply unit that blows air toward the solid fuel side from below the combustion unit;
A second combustion air supply unit that blows air into the combustion chamber from a side surface located above the upper surface of the combustion unit;
The combustion apparatus according to any one of claims 1 to 6, further comprising: On one end side of the combustion unit, a fuel supply port from which a solid fuel supplied from a fuel supply unit is extruded and supplied onto the combustion unit;
The combustion apparatus according to claim 1, further comprising:

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