JP2004270980A - Structure of combustion part of woody pellet stove - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure of a combustion part of a woody pellet stove capable of using the whole wood material including tree bark as the fuel without limiting a specific part of the wood material. <P>SOLUTION: This structure of the combustion part comprises a fire pot 12 receiving the woody pellet fuel A from its upper part, a fire grate 13 forming and holding a hearth by burnably receiving the woody pellet fuel A inside of the fire pot 12 and having a clearance for dropping the burnt ash, and an ash receiver for receiving the ash at a lower part of the fire grate 13. The fire grate 13 is provided with a movable body 31 capable of performing the fire slicing motion for scraping off the hearth by moving while interfering with the hearth accumulated on the fire grate 13. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a combustion part structure of a wood pellet stove using wood pellets as a fuel, and in particular, a wood pellet stove capable of applying the whole wood including a bark as a fuel without being limited to a specific part of the wood. It relates to a combustion part structure.
[0002]
[Prior art]
The wood pellet stove comprises a tank for storing wood pellets of fuel and a combustion chamber for burning wood pellets. The combustion chamber has a pellet supply unit that supplies wood pellets from a tank, a combustion unit that burns the received pellets, a heat exchange unit that heats indoor air with the heat, and an ash receiver that receives ash below the combustion unit. And the like. The combustion part is equipped with a grate with a gap to ensure the ventilation of combustion air and the fall of ash generated by combustion, and burns while supplying fuel to the combustion part from the pellet supply part. Controlled.
[0003]
The wood pellet is a non-fossil fuel formed by crushing and compressing a piece of wood, and the wood pellet stove of the above configuration effectively uses thinned wood, lumber scraps, etc., which are poorly available, as biomass resources.
[0004]
[Problems to be solved by the invention]
However, the fuel for the wood pellet stove is limited to relatively expensive ones with little burning, called white pellets formed by crushing and compressing the core of wood, and relatively inexpensive bark pellets and bark obtained by crushing and compressing the bark. When using brown pellets mixed with slag, there is a problem in that continuous combustion cannot be performed because the combustion grit forms a pile of fires in piles and overflows from the combustion part when additional fuel is supplied. Due to the difficulty in treating such wastes, the usable range is limited to a specific part of the wood, and a problem remains from the viewpoint of effective use of the wood as a biomass resource.
[0005]
An object of the present invention is to provide a combustion unit structure of a wood pellet stove capable of applying the whole wood including bark as fuel without being limited to a specific part of the wood.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention according to claim 1 includes a fire pot that receives wood pellet fuel from above, and burnt ash that falls while receiving the wood pellet fuel in a combustible manner inside the fire pot. In the combustion part structure of a wood pellet stove including a grate that forms and holds a grate with a gap, and an ash pan that receives ash below the grate, the grate is formed thereon. A movable body capable of performing an agitating operation to scrape the grate by moving while interfering with the grate.
[0007]
The burning section of the wood pellet stove receives the wood pellet fuel on the grate and enables combustion, and a deposition grate using wood pellets as a fuel is formed on the grate, and the combustion ash is transferred from the grate to the ash pan. Fall. At this time, by burning the movable body provided on the grate, the burning fuel and the flammable fuel forming the grate on the grate are disturbed, so that even if a large flammable fire occurs, Since the cinders are scraped and fall from the gap of the grate to the ash tray, the received pellet fuel is not spilled from the fire pot, so that the fuel can be further supplied and the combustion can be continued.
[0008]
The invention according to claim 2 is that, in the grate, an elongated hole that allows the movable body to move forward and backward is formed, and the movable body is erected and arranged along the elongated hole so that the movable body can move forward and backward. A reciprocating drive unit for moving the body forward and backward by controlling a signal is provided. In the combustion unit structure, the accumulation of the grate is eliminated by the movable body moving back and forth along the long hole of the grate under the signal control of the reciprocating drive unit.
[0009]
The invention according to claim 3 is characterized in that the signal control of the reciprocating drive unit is based on the determination of the combustion temperature or the level of the ventilation load of the combustion air. The combustion unit structure can determine the accumulation of the grate based on the clogging of the grate corresponding to the combustion temperature or the ventilation load of the combustion air, and continuous combustion by automatic control is possible.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment specifically configured based on the above technical idea will be described below with reference to the drawings.
[0011]
An overall configuration of a wood pellet stove provided with a combustion section according to the present invention will be described. FIG. 1 is a front view of a wood pellet stove. The wood pellet stove 1 is provided with a lid 2a of a tank 2 for storing wood pellets A as a fuel at the top so as to be openable and closable, and is provided with a combustion chamber 3 having a viewing window 3a formed on the lower front side thereof. The combustion chamber 3 has a heat exchange section 11 composed of a plurality of pipes opened at the upper front thereof, a fuel supply port 3c opened at a back wall 3b of the combustion chamber 3, and a receiving section 12a for receiving fuel from the fuel supply port 3c. A tubular fire pot 12 is provided, a fire grate 13 for forming and holding a grate in the fire pot 12, and an ash pan (not shown) below the fire grate 13. The fire part 12, the grate 13, the ash pan, and the like constitute a combustion part.
[0012]
Next, the internal configuration of the wood pellet stove will be described. FIG. 2 is a transparent side view of the wood pellet stove, and FIG. 3 is a transparent rear view thereof. A combustion chamber 3 is disposed in front of a tank 2 having an openable and closable lid 2a. A lower portion of the combustion chamber 3 communicates with an intake passage 21 for combustion air. And an exhaust fan 23 that sucks and discharges combustion air from the exhaust path 22. The inlet of the intake passage 21 and the outlet of the exhaust fan 23 are connected to the outside by a double pipe (not shown), so as to form a so-called FF type. The intake path 21 guides outside air to the combustion section by the suction force of the exhaust fan 23, and the combustion air is discharged from the exhaust path 22 to the outside via the exhaust fan 23.
[0013]
A guide path 24 is provided in contact with the rear side of the exhaust path 22 at the rear of the combustion chamber and communicates with each pipe of the heat exchange section 11, and a heat exchange fan 25 that feeds room air into the guide path 24. The indoor air is sent to the guide path 24 by the heat exchange fan 25, and the indoor air is sent to the heat exchange unit 11 by the guide path 24 while suppressing heat transfer from the high-temperature exhaust path 22 to the tank 2 side. The air heated by the heat exchange section 11 is discharged into the room from the front opening to heat the room.
[0014]
A spiral transport mechanism 26 for scooping up the fuel in the tank is provided at a lower portion of the tank 2, and an inclined guide path 27 for guiding the fuel into the combustion chamber from the upper end thereof is provided. The fuel A in the tank 2 is scooped up by the spiral transport mechanism 26 according to the drive signal, and is supplied to the fire pot 12 of the combustion section via the inclined guide path 27.
[0015]
As shown in an enlarged perspective side view of the combustion part in FIG. 4, a fire pot 12 is provided with a heater 12b for ignition, and a substantially rod-shaped movable body 31 protruding from below the grate 13 is provided. An elongated hole-shaped gap 13a is formed in the grate 13 and the movable body 31 is arranged along the gap 13a so as to be able to advance and retreat. As shown in the cross-sectional view of FIG. 5 showing the cross section taken along the line CC in FIG. 4, the movable body 31 supports the lower support arm of the grate 13 so as to interfere with the grate deposited on the grate 13. It is formed in a substantially L-shape from 31a. In addition, a reciprocating drive unit 32 is provided which is capable of causing the movable body 31 to perform an advancing / retreating operation of a constant stroke B by signal control, thereby performing a fretting operation for breaking down the grate. Specifically, the reciprocating drive unit 32 includes a solenoid that moves forward and backward in response to a signal, and is disposed on the back side of the grate 13 as shown in the figure. It can be constituted by a reciprocating motion mechanism such as a crank.
[0016]
The control of the reciprocating drive unit 32 includes a method of checking the elapse of a predetermined time from the start of combustion, and then operating the reciprocating drive unit 32 intermittently at regular time intervals or a method of operating according to the accumulation amount of the grate. Since the light-shielding sensor using visible light or infrared light cannot be applied, the amount of fire bed accumulation is determined based on the combustion temperature or ventilation resistance corresponding to the clogging of the grate 13. In the case of the combustion temperature, the temperature of the exhaust gas is detected by a temperature sensor provided in the exhaust path 22 and can be determined by a pattern of temperature change. In the case of the ventilation resistance, the ventilation load level can be determined based on the number of rotations, based on the correspondence between the ventilation load and the rotation number of the exhaust fan 23.
[0017]
According to the above control, even when the grate is piled up and formed by the ember, the reciprocating drive unit 32 is operated according to the clogging of the grate 13, and the movable body 31 performs the scrambling operation. Since the cinder in the grate collapses and falls along with the ash to the lower ash pan, the accumulation of the grate is eliminated, and additional supply of new fuel becomes possible.
[0018]
In this way, even if the cinder remains due to the combustion, the cinder is scraped and dropped from the gap 13a of the grate 13 into the ash catcher by operating the movable body 31 with the scuffing operation, so that the fuel is further supplied. Combustion can be continued. That is, due to the difficulty of the treatment of the cinders, fuels that generate large cinders that could not be applied as fuels, such as bark pellets obtained by crushing and compressing relatively inexpensive bark parts and brown pellets mixed with bark, are movable. Since the cinder is destroyed by the body's burning action and can be dropped into the ash pan, the fuel can be further supplied to continue the combustion.
[0019]
Therefore, the wood pellet stove 1 including the above-described combustion section is not limited to relatively expensive fuel based on a specific portion of wood, and can be widely applied to all portions including bark as wood fuel.
[0020]
【The invention's effect】
The combustion part structure of the wood pellet stove of the present invention has the following effects.
The burning portion of the wood pellet stove, even if the burn residue remains, because it was configured to prevent the accumulation and continuous combustion, without being limited to the specific wood pellet fuel without burn out, including the bark Since all parts of the wood can be used as the pellet fuel, thinned lumber and lumber scraps, which are poorly available, can be effectively used as biomass resources.
[0021]
Therefore, the use of wood as a wood pellet fuel has been limited to a range that can be used as a resource in the past, but it will lead to a review of wood value through the expansion of the range of use of wood as a fuel according to the present invention. As a result, the present invention can contribute to the formation of an energy recirculation system that does not rely on fossil fuels while activating forests, that is, the formation of a carbon dioxide gas recirculation system.
[0022]
If the reciprocating drive unit and the movable body capable of signal control prevent the grate from accumulating, continuous combustion is possible with a simple configuration, so low-cost fuel can be applied and a simple configuration can be used. Automatic combustion operation of wood pellet stove becomes possible.
[0023]
The above-described combustion part structure, when signal control of the sparking operation based on the combustion temperature or the ventilation load of the combustion air corresponding to the clogging of the grate, can easily detect the accumulation state of the grate that is difficult to detect. The determination can be made reliably by the detecting means.
[Brief description of the drawings]
FIG. 1 is a front view of a wood pellet stove,
FIG. 2 is a perspective side view of the wood pellet stove of FIG. 1; FIG. 3 is a perspective rear view of the wood pellet stove of FIG. 1; FIG. 4 is an enlarged perspective side view of a combustion part; FIG. Cross-sectional view of [Description of symbols]
REFERENCE SIGNS LIST 1 wood pellet stove 2 tank 3 combustion chamber 11 heat exchange unit 12 fire pot 13 grate 13 a gap 21 intake passage 22 exhaust passage 23 exhaust fan 31 movable body 31 a support arm 32 reciprocating drive unit A wood pellet (fuel)
B Reciprocating stroke

Claims (3)

A tubular fire pot that receives wood pellet fuel from above and a grate that forms and holds a grate with a gap in which the burned ash can fall while receiving the wood pellet fuel in a combustible manner inside the fire pot And, in the combustion part structure of a wood pellet stove comprising an ash tray receiving ash below the grate,
The combustion part of the wood pellet stove, wherein the grate is provided with a movable body capable of performing an operation of scraping the grate by moving while interfering with the grate deposited and formed thereon. Construction. An elongated hole is formed in the grate to allow the movable body to move forward and backward, and the movable body is erected along the elongated hole so as to be able to move forward and backward. The combustion unit structure of a wood pellet stove according to claim 1, further comprising a reciprocating drive unit that operates. 3. The structure of the wood pellet stove combustion unit according to claim 2, wherein the signal control of the reciprocating drive unit is based on a determination of a combustion temperature or a level of a ventilation load of the combustion air.

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