JP5467390B2 - Burning hot air generator for granular fuel - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a combustor using granular fuel such as medium pulverized coal, which is a granular fuel combustor capable of extending the replenishment interval time of granular fuel, efficiently converting heat generated by combustion into hot air, The present invention relates to a combustion hot air generator for granular fuel that supplies hot air into a room.

  Agricultural greenhouses such as plastic greenhouses are used for cultivation of agricultural products. This greenhouse is used in various ways depending on the region and its purpose.For example, there is no heating means in the greenhouse and the whole greenhouse is covered with sealed vinyl, and the heating means is installed in the greenhouse. There are those that are forcibly heated only at night, or those that are always forcedly heated.

  Conventionally, a dedicated heating device for burning heavy oil or the like has generally been used as the heating means. When this heating apparatus is installed inside a greenhouse, temperature control is generally performed by performing on / off control of a heavy oil combustion operation to an operation operation state or an operation stop state. Moreover, the combustion gas is emitted outside the greenhouse through a chimney or the like. This is because combustion gas such as heavy oil contains sulfur oxides, etc., and if released into the greenhouse, it pollutes the air in the greenhouse and the sulfur oxides may adhere to the crops. .

  By the way, as one method of effectively using a large amount of wood that is treated as industrial waste and wood such as thinned wood, these wood are recycled as charcoal and wood pellets, and the recycled charcoal and wood pellets are effectively used. One way is to use it as a fuel for heating.

Japanese Patent No. 3025953 “Charcoal Stove” Japanese Patent Laying-Open No. 2005-207727 “Charcoal Combustion Device” JP 2006-23074 A "Charcoal Combustion Device" JP 2009-198113 A "Solid fuel combustor" JP 2007-56237 A “Carbide Generation Kiln and Carbide Generation Method”

As shown in Patent Document 1 to Patent Document 4 above, when wood is processed into charcoal or wood pellets and used as a fuel for heating, the wood is cut into a reasonable size as fuel, and is crushed. However, there are problems such as keeping it dry so that it is easy to burn, and in reality, it seems that the situation is not easily spread.
As one measure for that, as shown in Patent Document 5, a technique for producing a granular pulverized coal with good handleability using a mechanical force in a pool-shaped flat furnace with an open top is developed as shown in Patent Document 5. The present inventors have come up with the idea that the above problem in the case of using wood as a heating fuel can be solved by utilizing this pulverized coal as a fuel. It is a device that effectively uses medium-mesh coal (scrap coal) as a fuel, heats the combustion for a long time and exchanges heat, and heats the greenhouse with warm air.

Charcoal (including medium pulverized coal) has advantages such as having the same size as fuel and being dried, compared to the case where wood is used as a heating fuel, but is becoming more popular Compared with liquid fuels such as oil and kerosene, there is a problem that it is difficult to burn (heat generation) continuously for a long time while automatically adjusting the thermal power (heat amount). That is, in order to use a charcoal combustion apparatus in a greenhouse, it was necessary to develop a charcoal combustion apparatus that can burn for a long time with a stable thermal power.
Therefore, 1) Make effective use of pulverized coal (scrap coal including medium-sized pulverized coal). 2) Burning pulverized coal, converting the heat generated by combustion into hot air, and supplying the hot air raises the basic temperature in greenhouses such as agricultural greenhouses, and fuel consumption of heating equipment using existing heavy oil and kerosene To suppress. 3) Do not require fuel (pulverized coal) supply at night. 4) In many cases, producers of pulverized coal pile up and store pulverized coal as products, and occasionally sprinkle water appropriately to prevent spontaneous combustion of the piled pulverized coal products. Therefore, the pulverized coal is wet and has a moisture content of approximately 10 to 13%, and the pulverized coal is difficult to burn. 5) Avoid releasing pulverized coal combustion gas directly into agricultural greenhouses. There is a need to solve these issues.

  The present invention has been devised to solve the above-described problem, and is a granular fuel that can stabilize the thermal power and burn granular charcoal (medium pulverized coal) over a long period of time, thereby extending the fuel replenishment interval time. The aim is to develop a hot air generator for combustion and raise the basic temperature in the greenhouse.

  In order to achieve the above object, a combustion hot air generator for granular fuel according to the present invention comprises a fuel container / combustion chamber in which medium-size coal is stored, a combustion chamber chimney, a combustion air supply port, a grate, an exhaust port, an air intake. It has an air blower, a heat exchange fin, a reheat pipe, and a hot air outlet, and the combustion time and heating power can be adjusted by adjusting the opening of the combustion air supply port.

  As a first solution to this, a fuel container / combustion chamber lid (5) is provided at the top, and a tray (6) with a grate into which outside air is introduced through the combustion burner air adjustment port (17) is provided at the bottom. A metal fuel container / combustion chamber (4) formed into a vertically long cylindrical shape, and a chimney (9A) provided on the upper part adjacent to the fuel container / combustion chamber (4) to form a vertically long cylindrical shape In the combustion hot air generator provided with the metal smoke exhaust chamber (3) formed in the outside, the external air is connected to the air intake blower (16) in the smoke exhaust chamber (3) and the outdoor air is combusted hot air A reheating pipe (19) introduced by being heated by a wind tunnel (14) provided on the outer periphery of the generator is disposed, and a tray with a grate (at the center of the fuel container / combustion chamber (4)) 6) Approach the upper part of the exhaust so that the smoke exhaust guide inlet (8A) faces, and the smoke exhaust guide outlet in the adjacent exhaust chamber (3) 8B) is provided with a flue gas guide cylinder (8), the fuel container / combustion chamber (4) and the chimney (9A) are communicated with each other via the smoke exhaust chamber (3), and the fuel container / combustion is further performed. A combustion gas passage (18) communicating with the outer periphery of the tray with a grate (6) is formed on the outer periphery of the chamber (4), and is formed on the outer periphery of the smoke exhaust guide discharge port (8B) of the smoke exhaust guide cylinder (8). By exhausting the smoke from the passage (18A) to the smoke chamber (9), the combustion heat of the smoke discharged to the chimney (9A) is absorbed in the smoke chamber (3). The reheating pipe (19) capable of reheating the warm air inside is arranged in an oblique posture with the warm air inlet side of the reheating pipe (19) at the top and the warm air outlet side at the bottom. It is characterized by this.

  As a second solution, a wind tunnel (14) made of metal heat exchange fins and an outer cover is provided along the entire outer periphery of the fuel container and combustion chamber (4) and the smoke exhaust chamber (3). The outer wall heat of the fuel container / combustion chamber (4) and the smoke exhaust chamber (3) is configured to transmit the residual heat into the wind tunnel, and an air intake blower (16) for introducing outside air to the inlet side of the wind tunnel (14). ), And the outlet side of the wind tunnel is connected to a reheating pipe (19) having a hot air outlet.

As described above, according to the combustion hot air generator for granular fuel of the present invention , the combustion gas passage is provided on the outer periphery of the fuel container / combustion chamber to promote the heating of the fuel container / combustion chamber by the exhaust gas, A heating device that efficiently converts the heat generated by combustion into hot air using a wind tunnel or a reheat pipe and supplies the hot air into a desired room, and uses a conventional liquid fuel such as heavy oil or kerosene, By using it together, the temperature in the greenhouse can be adjusted, and the amount of liquid fuel used can be suppressed by raising the basic temperature in the greenhouse.

The schematic sectional drawing inside the right side surface of the combustion hot air generator of the granular fuel which concerns on this invention is shown. 1 shows a schematic cross-sectional view of a main part of a combustion hot air generator for particulate fuel according to the present invention, a smoke exhaust chamber portion. The schematic front view of the combustion hot air generator of the granular fuel which concerns on this invention is shown, and the flow of combustion air and waste gas is shown. The schematic right view of the combustion hot air generator of the granular fuel which concerns on this invention is shown, and the flow of combustion air and waste gas is shown. 1 shows a schematic plan view of a granular fuel combustion hot air generator according to the present invention. It is a perspective view which shows the action state from the front right diagonal of the combustion hot air generator of the granular fuel which concerns on this invention, and has shown the flow of the air through a heat exchange fin. It is a perspective view which shows the action state from the rear right diagonal of the combustion hot air generator of the granular fuel which concerns on this invention, and has shown the flow of the air through a heat exchange fin. A part of graph data of the combustion test of the combustion hot air generator for granular fuel according to the present invention shows data in which 10 kg of medium-sized coal is charged. 1 is a schematic front sectional view of an agricultural greenhouse additionally equipped with a granular fuel combustion hot air generator according to the present invention. 1 shows a schematic plan view of an agricultural greenhouse additionally provided with a granular fuel combustion hot air generator according to the present invention.

Hereinafter, a combustion hot air generator for granular fuel according to an embodiment of the present invention will be described in detail.
In FIG. 1, the granular fuel combustion hot air generator 1 includes a fuel container / combustion chamber 4, a flue gas guide tube 8, a flue gas chamber 9, a chimney 9 </ b> A, an air intake fan 16, a wind tunnel 14, a heat exchange fin 15, It consists of a reheating pipe 19 and a hot air outlet 20 and surrounds the outer side of the combustion hot air generator 1 of the granular fuel so as to be covered with an outer cover 2.
From the schematic cross-sectional view of the granular fuel combustion hot air generator 1 shown in FIG. 1, the medium pulverized coal 7 used as the fuel is irregularly shaped with a mixture of lumps, pieces, and granules having irregular sizes. Usually, one side is about 30 mm or less, and powdery ones are mixed. Preferably, when the powdery material is not mixed, there is no clogging of the combustion material 7, oxygen supply is promoted, and thermal power is stabilized.
The charcoal used as the fuel is not limited to the medium-mesh coal 7 described above, and may be a mixture of charcoal with a side of 30 mm or more. In the present invention, these lump, flake, granule, and powdery charcoal fuels are collectively referred to as granular fuel.

(Fuel container and combustion chamber)
The fuel container / combustion chamber 4 is a vertically long cylindrical metal drum container, and the medium-mesh coal 7 of the fuel opens the cylindrical upper lid 5 that covers the upper portion of the fuel container / combustion chamber 4 so that it can be opened and closed. And is received by the lower cylindrical tray 6 with a grate. The tray 6 with a grate is configured to be slid freely into and out of the side, and the grate portion of the tray 6 with a grate can be cleaned by taking it out through a tray outlet 10. Yes. Reference numeral 11 denotes an ash reservoir at the bottom of the tray 6 with a grate, and an ash tray 13 is slidably mounted on the bottom of the ash reservoir 11 and is taken out from the ash outlet 12 to the ash treatment. Can be made possible.

Further, the container of the fuel container / combustion chamber 4 of the present embodiment is configured to have a large capacity to which about 25 kg of medium-sized coal coal 7 can be charged. For example, when 2 kg of medium-sized coal 7 is burned and consumed per hour, continuous operation can be performed for about 12.5 hours without replenishment.
Therefore, the replenishment interval time of the granular fuel can be lengthened, and nighttime refueling can be omitted, and continuous operation can be performed by refueling about twice a day.

When the medium pulverized coal 7 charged into the fuel container / combustion chamber 4 is ignited, the cylindrical grate-equipped tray 6 is slid out and pulled out to place an ignition fire, and then the lower part of the fuel container / combustion chamber 4 is placed. By pushing the tray 6 with a grate back to the predetermined position, outside air can be introduced into the tray 6 with a grate through the combustion air adjustment port 17 and ignited. Alternatively, the ash take-out port 12 is opened and the ash reservoir 11 is used to ignite the lower part of the medium pulverized coal 7 from the grate of the tray 6 with a grate by facing an ignition lighter, gas torch and the like. When ignited, the flue gas guide cylinder 8 receives the suction force of the chimney 9A and draws out the air in the medium pulverized coal 7 introduced through the combustion burning air adjusting port 17 to accelerate the ignition, thereby promoting the medium pulverized coal 7 That leads to the combustion of

(Smoke exhaust guide tube)
The flue gas guide cylinder 8 is made of an elbow-shaped metal pipe and is bent at a right angle. The flue gas guide cylinder 8 is brought close to the upper part of the tray 6 with a grate at the center of the fuel container / combustion chamber 4 and the flue gas induction suction port 8A is exposed. However, the smoke exhaust guide discharge port 8B is positioned in the adjacent smoke exhaust chamber 9. As a result, the combustion flue gas induces the flue gas from the fuel container / combustion chamber 4 to the flue gas chamber 9 to promote the combustion of the fuel, and the middle dust coal 7 of the fuel contains a little moisture (10-13%). ) In the container of the fuel container / combustion chamber 4 for the purpose of pre-drying to accelerate the drying of the medium pulverized coal 7 and the high-temperature combustion generated as the intermediate pulverized coal 7 burns. The purpose is to send the gas directly to the flue gas chamber 9 to quickly heat the reheating pipe 19. Further, as shown in FIGS. 1 and 4, a combustion gas passage 18 is formed on the outer periphery of the fuel container / combustion chamber 4 so as to communicate with the outer periphery of the tray 6 with a grate via the communication passage 6A. By exhausting the exhaust gas into the smoke exhaust chamber 9 also from the passage 18A formed on the outer periphery of the smoke exhaust guide discharge port 8B of the guide tube 8, the exhaust gas is promoted to flow out from the tray 6 with a grate and the fuel by the exhaust gas is exhausted. Heating of the container / combustion chamber 4 is promoted.

(Smoke chamber)
The smoke evacuation chamber 9 of the present embodiment is formed in a vertically long box shape, and a chimney 9A is provided in the upper part, and a reheating pipe 19 having a hot air outlet 20 is provided in the lower part from a height close to the chimney 9A to the lower part. It is built in a slanted state toward the. The smoke exhaust chamber 9 is disposed adjacent to the back side of the fuel container / combustion chamber 4, and receives high-temperature exhaust gas generated in the fuel container / combustion chamber 4 via the smoke exhaust guide cylinder 8. Furthermore, the Rukoto receiving from passage 18A formed exhaust gas from grate with pan 6 as shown in FIG. 4 on the outer circumference of the flue gas induced discharge port 8B of the flue gas guide tube 8, the flue gas from the stack 9A Since the reheat pipe 19 absorbs the heat in the smoke exhausting chamber 9 and heats the internal warm air using the high temperature exhaust gas temperature, the exhaust gas temperature exhausted from the chimney 9A can be lowered. it can.

(Air intake blower)
The air intake blower 16 of the present embodiment has a power supply 100 v capacity 80 w air flow rate of 9.5 m 3 / min, but the hot air temperature and the exhaust gas temperature can be changed by changing the fan capacity.

(Heat exchange fin)
The heat exchange fins 15 of the present embodiment are made of metal, and are attached to the exterior of the metal fuel container / combustion chamber 4 and the smoke exhaust chamber 9 by welding in a horizontal bowl shape, and the air sent by the air intake fan 16 is The heat exchange fins 15, the outer cover 2, the smoke exhaust chamber wall 3, and the outside of the combustion gas passage 18 pass through the wind tunnel 14 to heat the fuel container / combustion chamber 4 and the smoke exhaust chamber 9. In response to the heat exchange fins 15 that have been heated, they are heated and converted to warm air.

(Wind tunnel)
The wind tunnel of the present embodiment is illustrated in detail in FIGS. 6 and 7, but the front side of the entrance side located in front of the fuel container / combustion chamber 4 that is connected to the blower 16 and introduces outside air is obtained. A side wind tunnel (primary heating) is formed in a plurality of upper and lower layers in the upper and lower layers in the upper and lower layers of the wind tunnel (for primary heating) 14 </ b> A, and then formed in multiple upper and lower layers positioned on the right side of the fuel container / combustion chamber 4 and the smoke exhaust chamber 9. (Secondary heating) is secondarily heated by 14B, and is then thirdarily heated by a rear wind tunnel (for third heating) 14C formed in a plurality of upper and lower layers located on the back of the smoke exhausting chamber 9, and the rear wind tunnel (For tertiary heating) Fourth heating is performed by a longitudinal passage wind tunnel (for fourth heating) 14D formed of a longitudinal communication passage on the outlet side of 14C. Then, the bypass wind tunnel (for fifth heating) 14E extends from the upper portion of the vertical passage wind tunnel (for fourth heating) 14D to the rear upper portion of the smoke exhaust chamber 9 via the rear and right side portions of the smoke exhaust chamber 9. Next heating is further performed in the upper wind tunnel (for sixth heating) 14 </ b> F that detours from the rear surface of the smoke exhaust chamber 9 to the front side beyond the upper portion.

  The warm air heated in this way is passed through the zigzag wind tunnel (for 7th heating) 14G formed in a twisted shape on the left side of the fuel container / combustion chamber 4 from the upper position to the lower position. Then, 8th heating is performed in the vertical exit side wind tunnel (for 8th heating) 14H communicating with the upper reheating pipe 19 from the lower left side of the smoke exhausting chamber 9, and finally the reheating is performed. By performing the final reheating with the pipe 19, the temperature of the hot air outlet 20 can be increased.

  As described above, the wind tunnel 14 including the metal heat exchange fins 15, the outer cover 2, and the like is circulated along the entire outer periphery of the metal fuel container and combustion chamber 4 and the smoke exhaust chamber 9. That is, an inlet side front wind tunnel (for primary heating) 14A, a side wind tunnel (for secondary heating) 14B, a rear side wind tunnel (for tertiary heating) 14C, which are connected to the air intake blower 16 and introduce outside air, a vertical passage Wind tunnel (for fourth heating) 14D, bypass wind tunnel (for fifth heating) 14E, upper wind tunnel (for sixth heating) 14F, zigzag wind tunnel (for seventh heating) 14G, outlet side wind tunnel (for eighth heating) 14H, The outlet side wind tunnel (for 8th heating) 14H communicates with the reheating pipe 19. The combustion of the fuel heats the wind tunnel 14 composed of the metal heat exchange fins 15, the outer cover 2, etc., so that the air supplied from the air intake blower 16 passes through the wind tunnel 14 to perform primary heating. To the eighth heating until the 8th heating, and finally, the reheated pipe 19 provided in the smoke exhausting chamber 9 reheats the warm air inside and releases it to the chimney 9A. Is effectively used to promote the heating of the warm air in the reheating pipe 19 and is discharged from the warm air outlet 20 into the greenhouse 24 through the warm air duct 21.

(Reheat tube)
As described above, since there is a possibility that sufficient heat recovery cannot be performed only with the wind tunnel 14 constituted by the heat exchange fins 15, the reheating pipe 19 communicated with the hot air outlet 20 is provided with FIGS. 3 and the like, the reheating pipe 19 connected to the air intake blower 16 and introduced by the outside air being heated by the wind tunnel 14 provided on the outer periphery of the combustion hot air generator is introduced into the reheating pipe. Reheating pipe as low as possible in a limited space by passing the inside of the smoke exhaust chamber 9 in an oblique posture with the hot air inlet side of the upper part 19 and the hot air outlet side of the lower part 19 as the lower part. 19 and long structure, it is possible to effectively absorb heat Haikemurishitsu 9, in which the hot air passing through the reheating pipe 19 reheated an effect of increasing the recovery thermal efficiency.

Due to the above, as shown in FIG. 8, there is almost no difference between the exhaust temperature from the chimney 9A and the hot air outlet temperature from the hot air outlet 20.
That is, the fact that the temperature of the exhaust port and the temperature of the hot air outlet are almost the same indicates that the heat recovery efficiency is high. In addition, by changing the capacity of the fuel container / combustion chamber 4 greatly, it is possible to increase the amount of medium pulverized coal, thereby further reducing the number of fuel replenishments and enabling long-term continuous operation of combustion. It also shows that there is.

(Application to greenhouse)
9 and 10 are schematic views for explaining an installed state of the granular fuel combustion hot air generator according to the embodiment of the present invention.
In the figure, a pulverized coal combustion hot air generator 1 is installed inside a greenhouse 24 for cultivating roses 23 as an example of agricultural products, and is connected to a hot air outlet 20 of the granular fuel combustion hot air generator 1. Hot air is supplied to the internal space 25 of the greenhouse 24 from the open end of the hot air duct 21 by a connected vinyl hose or the like and the hot air outlets 22 formed in the middle of the hot air duct 21. If it does in this way, the temperature of the interior space 25 of the greenhouse 24 can be raised.

By raising the temperature of the internal space 25, the operation interval of the heating device 28 with existing heavy oil becomes longer, the amount of liquid fuel such as heavy oil and kerosene can be suppressed, and cost reduction and global warming can be suppressed.
In addition, when the internal temperature of the greenhouse 24 rises from the set value, the granular fuel pulverized coal combustion hot air generator 1 according to the present invention stops the air intake blower 16 according to the detection result of the temperature controller 26, Has a function to stop the blowing of wind.

With the configuration of the above embodiment, the fuel (medium dust coal) 7 charged into the fuel container / combustion chamber 4 of the granular fuel combustion hot air generator 1 is combusted with the fuel container / combustion chamber lid 5 closed. The air from the air control port 17 is burned while being sucked by the suction force from the chimney 9 </ b> A, and the smoke is exhausted from the outer passage 18 </ b> A of the smoke guide tube 8 through the smoke guide tube 8 and the combustion gas passage 18. To the outside through the chimney 9A. As a result, even if the fuel (medium pulverized coal) 7 is wet, it receives combustion heat, accelerates drying and burns smoothly, and heats the metal fuel container / combustion chamber 4 and the smoke exhaust chamber 9. Since the wind tunnel 14 composed of the metal heat exchange fins 15 and the like that are circulated around these outer circumferences is heated, the air supplied from the air intake blower 16 is heated gradually by passing through the wind tunnel 14. Finally, the heat released by the reheating pipe 19 provided obliquely in the smoke exhausting chamber 9 and released to the chimney 9A is effectively used to promote the heating of the warm air in the reheating pipe 19. Then, the hot air is discharged from the hot air outlet 20 through the hot air duct 21 into the greenhouse 24 from the hot air outlet 22. Thus, the combustion energy of the fuel (medium pulverized coal) 7 can be effectively used for generating hot air and used for auxiliary heating in the greenhouse.

Since the combustion gas hot air generator for granular fuel according to the present invention is a device that discharges combustion gas from a chimney and converts the air into hot air for heating, it can be used in a wide range.
For example, it can be used for greenhouse cultivation in agriculture, as well as heating for medium-sized offices, cafeterias, meetinghouses, entertainment facilities, etc. Since the amount of electricity used can be extremely reduced, global warming can be suppressed.
It is also suitable for indoor heating and underfloor heating for home use and mountain huts.
Further, by arranging a metal pipe or the like that communicates with the water supply in the inside of the smoke exhausting chamber or the outer periphery of the fuel container / combustion chamber 4 and the smoke exhausting chamber 9, the tap water is warmed and converted to warm water. It is also possible.

  In addition, although the combustion hot air generator of the granular fuel which concerns on this invention illustrated charcoal as a fuel, it may be bamboo charcoal materials other than charcoal, organic waste charcoal of food residue, waste wood material, thinned wood, driftwood, It is also used in fuel materials such as wood pellets that are crushed and compressed and shaped into pellets with a diameter of about 4-8mm, and wood pellets containing pulverized coal mixed with pulverized coal into the wood pellets. It is possible to combust and it is added that it is a collective term for granular fuel.

DESCRIPTION OF SYMBOLS 1 Combustion hot air generator of granular fuel 2 Outer cover 3 Smoke exhaust chamber wall 4 Fuel container and combustion chamber 5 Fuel container and combustion chamber lid 6 Saucepan with grate 7 Fuel (medium dust coal)
8 Smoke guide cylinder 8A Smoke induction suction port 8B Smoke induction discharge port 9 Smoke exhaust chamber 9A Chimney 10 Fenced tray outlet 11 Ash reservoir 12 Ash outlet 13 Ash tray 14 Wind tunnel 14A Front side wind tunnel (primary For heating)
14B Side wind tunnel (for secondary heating)
14C Rear wind tunnel (for tertiary heating)
14D Longitudinal wind tunnel (for fourth heating)
14E Bypass wind tunnel (for fifth heating)
14F Upper wind tunnel (for 6th heating)
14G zigzag wind tunnel (for 7th heating)
14H Exit side wind tunnel (for 8th heating)
DESCRIPTION OF SYMBOLS 15 Heat exchange fin 16 Air intake blower 17 Combustion air control port 18 Combustion gas passage 19 Reheating pipe 20 Hot air outlet 21 Hot air duct 22 Hot air outlet 23 Agricultural crop (rose)
24 Greenhouse 25 Greenhouse interior space 26 Temperature controller 27 Control box 28 Heavy oil heater 29 Carbon dioxide generator

Claims (2)

A fuel container and combustion chamber lid (5) is provided in the upper part, and a vertically long cylindrical shape is provided in which the lower part is provided with a tray (6) with a grate into which the outside air is introduced through the combustion air adjustment port (17) . Metal fuel container / combustion chamber (4), and a metal smoke exhaust chamber formed in a vertically long cylinder with a chimney (9A) adjacent to the fuel container / combustion chamber (4). (3) in a combustion warm air generator is disposed, and exhaust smoke chamber (3) is connected to the air intake blower (16) within and outside air air provided on the outer periphery of the combustion warm air generator wind tunnel ( 14) A reheating pipe (19) that is introduced by being heated by warm air is disposed, and at the center of the fuel container / combustion chamber (4), it is brought close to the upper part of the tray (6) with a grate and exhausted. Smoke induction tube (8A) facing the smoke induction suction port (8B) located in the adjacent smoke exhaust chamber (3) ( ) And is provided, the fuel container and the combustion chamber and the chimney (9A) (4) communicates via a Haikemurishitsu (3), further, the fuel container and the outer peripheral saucer with grate of the combustion chamber (4) ( 6) A combustion gas passage (18) communicating with the outer periphery of the exhaust gas is formed and exhausted from the passage (18A) formed at the outer periphery of the exhaust gas discharge port (8B) of the exhaust gas guide cylinder (8). by to discharge the chamber (9), the re-in exhaust smoke chamber (3) in, can be re-heated hot air inside absorbs fumes combustion heat is discharged to the chimney (9A) Generation of combustion hot air of granular fuel, characterized in that the heating pipe (19) is arranged in an inclined posture with the hot air inlet side of the reheating pipe (19) at the top and the hot air outlet side at the bottom. vessel.   Along the entire outer periphery of the fuel container / combustion chamber (4) and the smoke exhaust chamber (3), the fuel container / combustion chamber (4) travels around a wind tunnel (14) made of metal heat exchange fins and an outer cover. And the outer wall heat of the smoke exhaust chamber (3) is configured to transmit residual heat into the wind tunnel, and an air intake blower (16) for introducing outside air is connected to the inlet side of the wind tunnel (14). 2. The hot air generator for combustion of granular fuel according to claim 1, characterized in that the outlet side of the fuel is communicated with a reheating pipe (19) having a hot air outlet.

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