JP6994211B1 - High temperature gas generator and high temperature gas generation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high temperature gas generator and a high temperature gas generation method capable of efficiently generating high temperature gas even when the fuel contains a biomass raw material which is relatively difficult to burn such as bark material and branches and leaves. A first combustion unit together with a first combustion unit 10 incompletely combusting a first fuel with an amount of air that does not completely burn, and a first fuel incompletely combusted by a first combustion unit 10. It has a second combustion unit 20 that burns with an amount of air larger than the amount of air supplied to 10. [Selection diagram] Fig. 1

Description

The present invention relates to a high temperature gas generator and a high temperature gas generation method capable of generating a high temperature gas that can be used as a heat source for a boiler, a dryer, a small furnace, or the like.

In recent years, from the viewpoint of environmental problems and energy problems, research on technology for producing biomass solid fuel from plant-derived biomass has been actively conducted. For example, Patent Document 1 exemplifies a method of producing a biomass solid fuel by semi-carbonizing a biomass raw material and molding it.
On the other hand, fossil fuels such as petroleum and coal are usually used in heat treatment such as semi-carbonization treatment of biomass raw materials, but if the biomass raw materials contain a large amount of water, it is costly to perform heat treatment using fossil fuels. There is concern about the negative impact on the environment due to the increase in biomass and exhaust gas. Therefore, it is preferable that the biomass raw material is dried without using fossil fuel. In this regard, for example, Patent Document 2 discloses a combustion device that uses wood such as firewood or wood waste as fuel to generate high-temperature gas, and by using such a combustion device, fossil fuel can be obtained. It is possible to secure a heat source used for the drying treatment of the biomass raw material without using it.

Japanese Unexamined Patent Publication No. 2020-183494 JP-A-2019-066048

However, the combustion device described in Patent Document 2 uses relatively highly combustible wood such as firewood and waste wood, and is efficient when the fuel contains low combustible wood such as bark wood and branches and leaves. There was a problem that high temperature gas could not be generated.
An object of the present invention is to provide a high-temperature gas generator and a high-temperature gas generation method capable of efficiently generating high-temperature gas even when the fuel contains a biomass raw material such as bark or branches and leaves that are relatively difficult to burn. And.

The high temperature gas generator according to the present invention has a first fuel input port for charging a solid or semi-solid first fuel, and air that does not completely burn the first fuel charged from the first fuel input port. It has a first combustion unit for incomplete combustion in an amount and a second fuel input unit for charging a solid or semi-solid second fuel different from the first fuel, and the second fuel input unit to the second fuel input unit. The two fuels are newly charged, and the first fuel that communicates with the first combustion unit and is incompletely burned in the first combustion unit is input. With the first fuel that has been incompletely burned, and a second fuel portion that burns with a larger amount of air than the amount of air supplied to the first combustion unit, the first fuel and the first fuel. The two fuels are a biomass raw material, and the second fuel is a fuel that is harder to burn than the first fuel or a fuel that is harder to crush than the first fuel .
In the high temperature gas generator, in the second combustion unit, the first fuel and the second fuel are completely combusted together with the first fuel incompletely burned by the first combustion unit. It can be configured to burn with an amount of air larger than the amount of air.
In the high temperature gas generator, the first combustion unit may have a combustion burner.
In the high temperature gas generator, a third fuel that does not burn in the second combustion section, combustion residues of the second fuel, and / or combustible gas generated in the second combustion section is burned. It can be configured to further have a combustion unit.
In the high temperature gas generator, the second combustion unit has a rotary kiln and a plurality of scraping plates installed in the rotary kiln, and in the second combustion unit, the rotary kiln is rotated and the plurality of scraping plates are rotated. By swirling the scraping plate around the rotation axis of the rotary kiln, the first fuel and the second fuel can be combusted while being agitated.
In the high temperature gas generator, the first fuel inlet and the second fuel inlet may be configured to be installed on the same surface side of the high temperature gas generator .
In the high temperature gas generator, the first fuel may be configured as a biomass raw material crushed to 5 mm or less.
In the high temperature gas generation method according to the present invention, a first combustion step in which a solid or semi-solid first fuel is incompletely burned with an amount of air that does not completely burn, and the incompletely burned first fuel are introduced, and at the same time, the first fuel is incompletely burned. Second combustion in which a solid or semi-solid second fuel different from the newly introduced first fuel is burned together with the incompletely burned first fuel with a larger amount of air than in the first combustion step. The first fuel and the second fuel are biomass raw materials, and the second fuel is a fuel that is harder to burn than the first fuel or harder to crush than the first fuel. It is a fuel .
In the high temperature gas generation method, the first fuel can be configured as a biomass raw material pulverized to 5 mm or less.

According to the present invention, there is provided a high temperature gas generator and a high temperature gas generation method capable of efficiently generating high temperature gas even when the fuel contains a biomass raw material such as bark or branches and leaves that is relatively difficult to burn. Can be done.

It is a side sectional view of the high temperature gas generation apparatus which concerns on 1st Embodiment. It is a front view of the high temperature gas generation apparatus which concerns on 1st Embodiment. It is a block diagram which shows the high temperature gas generation apparatus which concerns on 2nd Embodiment. It is a block diagram which shows the high temperature gas generation apparatus which concerns on 3rd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The high temperature gas generating apparatus according to the present embodiment is characterized in that high temperature gas is generated using a biomass raw material (for example, waste wood, unused bark wood, white pellets, black pellets, branches and leaves, etc.) as fuel. Further, in the present embodiment, instead of first igniting the second fuel, which is a relatively hard-to-burn biomass raw material such as bark wood and branches and leaves, a burner or the like is used to first generate a fire source or high-temperature combustion gas. It is characterized by efficiently burning a second fuel, which is difficult to burn, by using the generated ignition type and high-temperature combustion gas.

<< First Embodiment >>
FIG. 1 is a side sectional view of the high temperature gas generating device 1 according to the first embodiment, and FIG. 2 is a front view of the high temperature gas generating device 1 according to the first embodiment. As shown in FIG. 1, the high temperature gas generation device 1 according to the present embodiment has a first combustion unit 10, a second combustion unit 20, and a third combustion unit 30. In FIG. 1, the flow of air flowing through the high temperature gas generator 1 is indicated by an arrow. Further, in FIG. 2, for convenience of explanation, the scraping plate 211 arranged inside the kiln main body 21 is shown by a broken line.

The first combustion unit 10 is provided with a combustion burner, and a biomass raw material crushed to 5 mm or less (hereinafter, also referred to as a first fuel) is mixed with air and burned. Specifically, for charging the first fuel into the inside of the first combustion unit 10 from the first fuel input port 11 of the first combustion unit 10 and burning the first fuel inside the first combustion unit 10. Air is introduced, and a mixture of the first fuel and air is ignited and burned by a pilot burner or the like. The biomass raw material used as the first fuel is not particularly limited as long as it is pulverized to 5 mm or less, but is preferably 3 mm or less, and more preferably 1 mm or less. Further, the size of the first fuel (for example, 5 mm, 3 mm, 1 mm) can be defined by the average particle size (average particle size 5 mm, average particle size 3 mm, average particle size 1 mm). Further, the first fuel is preferably a biomass raw material, and particularly preferably a highly combustible waste wood, a dried material, a torrefaction material, or the like.

Further, in the first combustion unit 10, only an amount of air smaller than the amount of air required for complete combustion of the first fuel is supplied, and the first fuel is burned. Therefore, in the first combustion unit 10, the first fuel is incompletely burned, and the high-temperature combustion gas generated by the combustion and the first fuel that is partially unburned or carbonized or semi-carbonized due to the incomplete combustion. Is charged into the second combustion unit 20. In the present embodiment, in order to adjust the amount of air supplied to the first combustion unit 10 to match the input amount of the first fuel, a combustion blower and an air amount adjusting valve (for example, a butterfly valve) (not shown) are provided. be able to. When a combustion blower is provided, the rotation speed of the blower is controlled by an inverter, and the first fuel and air are simultaneously transported by air so as to have a low pressure of 400 to 600 mmAq (pressure that shortens the flame length). It is preferable to do so. Further, the amount of air supplied to the first combustion unit 10 is an amount in the range of 0.6 to 0.98 when the amount of air required for complete combustion of the charged first fuel is 1. The amount is preferably in the range of 0.7 to 0.95.

As shown in FIGS. 1 and 2, the second combustion unit 20 includes a kiln main body 21, a second fuel input unit 22, and an air blowing unit 23. The kiln main body 21 of the second combustion unit 20 can be a rotary kiln, and the first fuel incompletely burned in the first combustion unit 10 is supplied from the first combustion unit 10. Further, in the present embodiment, there is a second fuel charging unit 22 for charging the second fuel into the second combustion unit 20. As shown in FIG. 1, the second fuel input unit 22 according to the present embodiment has a hopper 221, a transport path 222, and a screw conveyor 223. As a result, by charging the second fuel into the hopper 221, the second fuel is conveyed through the transport path 222 by the screw conveyor 223 and supplied to the inside of the kiln main body 21.

Further, in the present embodiment, as shown in FIG. 1, the second combustion unit 20 has an air blowing unit 23 for burning the first fuel and the second fuel. The air blowing unit 23 takes in air from the air blowing port 231 and blows the taken-in air into the kiln main body 21. Since the first fuel incompletely burned from the first combustion unit 10 is input to the kiln main body 21, the first fuel and the first fuel are used by using the first fuel as a fire source and the air supplied from the air inlet 231. 2 Fuel is burned.

In particular, the amount of air supplied to the second combustion unit 20 is 1.2 when the amount of air required for complete combustion of the incompletely burned first fuel and the second fuel is 1. The amount is preferably in the range of ~ 2.0, and more preferably in the range of 1.3 to 1.6. The amount of air supplied to the second combustion unit 20 can be appropriately changed according to the temperature and amount of the generated high-temperature gas. Further, in order to control the amount of air supplied to the second combustion unit 20, the second combustion unit 20 can be configured to have a combustion blower and an air amount adjusting valve (for example, a butterfly valve) (not shown).

In the present embodiment, the kiln main body 21 is provided with an inclination of 1 to 5 degrees downward from the inlet side (second fuel input portion 22 side) to the outlet side (third combustion portion 30 side). As a result, the kiln main body 21 rotates, so that the first fuel and the second fuel charged into the kiln main body 21 are conveyed from the inlet side to the outlet side and are charged into the third combustion unit 30. Further, in the present embodiment, a plurality of scraping plates 211 are fixedly installed on the inner surface of the kiln main body 21. Specifically, as shown in FIG. 2, the scraping plate 211 is arranged and fixed at a plurality of positions in the circumferential direction of the kiln main body 21 (four locations in the circumferential direction in the example shown in FIG. 2), and is also shown in FIG. As shown in 1, a plurality of scraping plates 211 are arranged side by side in the extending direction (rotational axis direction) of the kiln main body 21. As a result, in response to the rotation of the kiln main body 21, the scraping plate 211 also rotates in the circumferential direction of the kiln main body 21 around the rotation axis of the kiln main body 21, so that the first fuel and the first fuel charged into the kiln main body 21 The 2 fuels are repeatedly lifted upward by the scraping plate 211 according to the rotation of the kiln main body 21 and dropped at the timing when the scraping plate 211 reaches the upper side, and the first fuel and the second fuel are agitated. It can be burned while burning. Instead of the configuration having the scraping plate 211, a screw conveyor may be provided inside the kiln main body 21, and the screw conveyor may be used to convey the first fuel and the second fuel while stirring.

Subsequently, the third combustion unit 30 will be described. As shown in FIGS. 1 and 2, the third combustion unit 30 has a kiln main body 31, a screw conveyor 32, and a high temperature gas discharge port 33. In addition to the high-temperature gas generated in the second combustion unit 20 flowing into the third combustion unit 30, residues such as oil that were not burned in the second combustion unit 20 and generated in the second combustion unit 20. Combustible gas such as carbonization gas is supplied, and further combustion is performed in the kiln main body 31. As a result, a hot gas having a higher temperature (for example, 850 ° C. or higher) is generated. Then, the generated high-temperature gas is supplied to each facility from the high-temperature gas discharge port 33 installed on the ceiling of the kiln main body 31. The ash of the first fuel and the second fuel burned in the first combustion unit 10, the second combustion unit 20, and the third combustion unit 30 is discharged to the outside by the screw conveyor 32 from an ash discharge port (not shown). To.

As described above, in the high temperature gas generator 1 according to the first embodiment, the first combustion unit 10 that incompletely burns the first fuel with an amount of air that the first fuel does not completely burn, and the second fuel are used. By having a second fuel unit 20 that burns with a larger amount of air than the amount of air supplied to the first combustion unit 10, together with the first fuel that has been incompletely burned by the first combustion unit 10. Can be used as a fire source to efficiently burn a second fuel such as bark or branches and leaves, which has a lower flammability than the first fuel. As a result, even when a biomass raw material such as bark or branches and leaves, which is relatively difficult to burn, is used as fuel, high-temperature gas can be efficiently generated. In particular, in the device using the conventional combustion burner, various measures have been taken so that the fuel is completely burned in the combustion frame (flame), but in the combustion burner of the first combustion unit 10 according to the present embodiment, various measures are taken. Dare to drop the first fuel into the kiln body 21 of the second combustion unit 20 in the state of being in the middle of combustion without completely burning the first fuel in the combustion frame. As a result, the first fuel supplied from the first combustion unit 10 can be used as the fire source of the second fuel having irregular shapes such as bark material and branches and leaves, and the combustion efficiency of the entire device can be improved. Further, by not completely burning the first fuel in the first combustion unit 10, the temperature of the flame in the first combustion unit 10 can be suppressed to a low level, and NOx discharged from the first combustion unit 10 can be reduced. can.

Further, in the first embodiment, the combustion residue of the first fuel and the second fuel that did not burn in the second combustion unit 20 and / or the combustible gas generated in the second combustion unit 20 are burned. Since the combustion unit 30 is further provided, the temperature of the high-temperature gas can be raised to, for example, 850 ° C. or higher, and a higher-temperature high-temperature gas can be supplied. Further, in the high temperature gas generator 1 according to the first embodiment, the first fuel can be easily burned by crushing the first fuel to 5 mm or less, and the second fuel is burned using this as a fire source. By doing so, it is possible to efficiently burn the second fuel, which has lower combustibility than the first fuel, so that the combustion efficiency of the fuel can be improved as a whole, and high-temperature gas can be efficiently generated. can. The generated high-temperature gas is supplied to a waste heat boiler, a superheated steam generator, a dryer, and the like, and can be used.

In addition, in the present embodiment, by using the rotary kiln as the kiln main body 21, the first fuel and the second fuel can be burned while being agitated in the second combustion unit 20, and the first fuel and the second fuel can be burned. It is possible to deal with variations in calorific value and moisture. That is, as the transport combustion means of the first fuel and the second fuel, a transport combustion means such as a fluidized bed type or a stoker type can also be used, but when these means are used, the calorific value of the fuel is too high. , Not suitable if too few. In addition, a problem arises when the water content varies widely. On the other hand, in the present embodiment, the first fuel and the second fuel can be agitated by rotating the kiln main body 21, so that the first fuel and the second fuel can be uniformly heated. The first fuel and the second fuel can be burned efficiently. Further, in the present embodiment, as shown in FIGS. 1 and 2, a plurality of scraping plates 211 are provided in the kiln main body 21, and the scraping plates 211 bring the first fuel and the second fuel to the upper part inside the kiln main body 21. By repeating lifting and dropping, the first fuel and the second fuel can be more agitated, so that the first fuel and the second fuel can be burned efficiently.

<< Second Embodiment >>
Next, a second embodiment of the present invention will be described. In the second embodiment, a small high-temperature gas generator 1a that can be used even when there is no space for providing a combustion burner having a long flame length as in the high-temperature gas generator 1 according to the first embodiment will be described as an example. .. Here, FIG. 3 is a block diagram showing the high temperature gas generator 1a according to the second embodiment. As shown in FIG. 3, the high-temperature gas generator 1a according to the second embodiment has a first combustion unit 10a for generating and supplying a high-temperature combustion gas, and a second fuel for burning the first fuel and the second fuel. It has two combustion portions 20a.

The first combustion unit 10a according to the second embodiment is not a combustion burner, but may be any as long as it can generate high-temperature combustion gas and supply the generated high-temperature combustion gas to the second combustion unit 20. In the first combustion unit 10a, for example, flammable paper or twigs and relatively large-sized firewood or charcoal are put in, ignited, and burned to generate high-temperature combustion gas. Further, outside air is taken into the first combustion unit 10a by the draft of the high temperature gas generating device 1a, and is used for generating the high temperature combustion gas. When there is a large amount of the first fuel and the second fuel, the first combustion unit 10a may burn the first fuel and / or the second fuel. The high-temperature combustion gas generated in the first combustion unit 10a is supplied to the second combustion unit 20a by the draft wind force.

Further, the second combustion unit 20a according to the second embodiment has a rocket stove structure as shown in FIG. Specifically, the second combustion unit 20a includes a fuel input unit 21a for charging the first fuel and the second fuel, a combustion chamber 22a for burning the first fuel and the second fuel, and the first combustion. The combustion gas blowing port 23a to which the high-temperature combustion gas generated in the section 10a is supplied, the flow path 24a into which the high-temperature combustion gas blown from the combustion gas blowing port 23a flows, and the high-temperature high-temperature gas generated in the combustion chamber 22a are introduced. It has a high temperature gas discharge port 25a for discharging and an ash discharge port 26a for discharging the ash of the first fuel and the second fuel burned in the combustion chamber 22a. Further, in a general rocket stove structure, the fuel inlet 211a for charging the first fuel and the second fuel and the air intake port for taking in the air required for combustion are also used, but the present embodiment relates to this embodiment. The high temperature gas generator 1a has a combustion gas blowing port 23a for taking in the high temperature combustion gas from the first combustion unit 10a, in addition to the fuel input port 211a for charging the first fuel and the second fuel. , Enables efficient combustion of the first fuel and the second fuel.

Also in the second embodiment, in order to efficiently generate high-temperature combustion gas, after burning the first fuel such as waste wood crushed to 5 mm or less to some extent, the second fuel such as bark wood and branches and leaves is input. The second fuel is burned using the first fuel as a fire source. The first fuel and the second fuel are charged into the combustion chamber 22a from the fuel input port 211a of the fuel input unit 21a. Since the second fuel may consist of irregular leaves or branches, it may not be possible to transport the second fuel to the combustion chamber 22a only by drafting. Therefore, the fuel input section 21a is provided with a screw conveyor 212a. The screw conveyor 212a is a screw press type screw conveyor designed so that the pitch becomes narrower toward the outlet side (combustion chamber 22a side), and the second fuel can be charged into the combustion chamber 22a while being press-compressed. By compressing the second fuel with the screw conveyor 212a in this way, the entire cross section of the fuel input portion 21a can be closed with the second fuel to seal the fuel input port 211a, and as a result, from the fuel input port 211a. Since the flame (or high-temperature air or gas) can be prevented from leaking to the outside, the safety of the operator can be ensured.

In the combustion chamber 22a, the primary combustion and the secondary combustion of the first fuel and the second fuel are performed using the high temperature combustion gas generated in the first combustion unit 10a, and the high temperature high temperature gas generated by the secondary combustion is performed. Is supplied from the high temperature gas discharge port 25a to equipment such as a boiler, a dryer, and a deodorizing device. The combustion chamber 22a has a pilot burner (not shown) and ignites the first fuel and the second fuel. Further, by installing a flame detector (not shown) near the ash discharge port 26a and detecting the ignition state of the first fuel and the second fuel inside the combustion chamber 22a, the pilot burner can be used to control the first fuel and the second fuel. It can be configured to control ignition.

Further, in the second combustion unit 20a according to the second embodiment, a partition plate 27a is interposed between the flow path 24a and the combustion chamber 22a. The partition plate 27a has a plurality of holes, and the high-temperature combustion gas that has passed through the flow path 24a is supplied to the combustion chamber 22a through the holes of the partition plate 27a, and the first fuel and the second fuel are supplied. The burned ash falls to the flow path 24a side through the hole of the partition plate 27a. The ash is carried to the ash discharge port 26a by the flow of the high temperature combustion gas, and can be discharged from the ash discharge port 26a. In the present embodiment, the first fuel and the first fuel burned in the combustion chamber 22a are provided by providing the heat-resistant ash discharge screw conveyor 28a at the position where the ash falls below the combustion chamber 22a in the flow path 24a. 2 The configuration is such that fuel ash can be discharged to the outside.

In the high temperature gas generation device 1a according to the second embodiment, in order to reduce the size, a blower or a fuel supply device is not provided in the second combustion unit 20, and a draft (height difference between the combustion chamber 22a and the high temperature gas discharge port 25a) is used for passage. The structure is such that the high-temperature combustion gas from the first combustion unit 10a is blown to the second combustion unit 20 by the wind force. However, if sufficient power transmission cannot be obtained only by draft wind flow, or if the pressure loss is large due to the boiler to which the high temperature gas is supplied, a blower is installed in the first combustion unit 10a or the second combustion unit 20a. It can be provided so that the high temperature combustion gas is sent from the first combustion unit 10a to the second combustion unit 20a.

Further, in the second embodiment, the adjusting valve 13 is provided between the first combustion unit 10a and the second combustion unit 20a, and the flow rate of the high temperature combustion gas supplied from the first combustion unit 10a can be adjusted. .. The flow rate of the high-temperature combustion gas can be adjusted by the adjusting valve 13 manually or automatically based on, for example, the temperature of the combustion chamber 22a. Incomplete combustion fuel or ash may flow from the first combustion unit 10a into the combustion chamber 22a, but the incomplete combustion fuel is the first fuel and the second fuel in the second combustion unit 20a. It can be burned together to make ash, and together with the ash flowing in from the first combustion unit 10a, it can be discharged to the outside by the ash discharge screw conveyor 28a.

As described above, in the high temperature gas generating device 1a according to the second embodiment, the high temperature combustion gas is generated in the first combustion unit 10a without using the combustion burner, and the second combustion unit 20a is used as the rocket stove structure. By burning the first fuel and the second fuel using the high-temperature combustion gas generated by the combustion unit 10a, the high-temperature gas is supplied to the equipment such as the waste heat boiler as in the high-temperature gas generator 1 according to the first embodiment. In addition, the size of the entire device can be made smaller than that of the high temperature gas generating device 1 according to the first embodiment.

Further, in the second embodiment, the fuel input unit 21a is provided with a sealing mechanism (screw press type screw conveyor 212a) so that flame (or high-temperature air or gas) does not leak from the fuel input port 211a. Has been done. This is because when the temperature near the high temperature gas discharge port 25a is high or when the pressure loss of the high temperature gas supply destination is large, it may not be possible to obtain sufficient draft wind flow, and a blower (not shown) may be used. , It is necessary to push the high temperature combustion gas from the first combustion unit 10a through the second combustion unit 20a and the high temperature gas discharge port 25a to the equipment of the supply destination. In such a case, the high temperature combustion gas from the fuel input port 211a. This is because there is a risk of spouting. Therefore, in the high temperature gas generator 1a according to the present embodiment, the fuel input unit 21a includes a screw press type screw conveyor 212a, and the screw conveyor 212a transports the first fuel and the second fuel while compressing them. The entire cross section of the fuel input portion 21a can be closed with the compressed first fuel and the second fuel, and the fuel input port 211a can be sealed.

Further, in the high temperature gas generating device 1a according to the second embodiment, a partition plate 27a having a plurality of holes is provided between the combustion chamber 22a and the flow path 24a, and the lower part of the flow path 24a is the lower part of the combustion chamber 22a. The ash discharge screw conveyor 28a is installed at the position where the ash is discharged. As a result, when the first fuel and the second fuel that have finished burning in the combustion chamber 22a become ash, the ash is dropped from the hole of the partition plate 27a to the lower part of the combustion chamber 22a, and the ash discharge screw conveyor. Since the ash can be discharged to the outside at 28a, it is possible to effectively prevent the ash from scattering from the high temperature gas discharge port 25a to each facility.

Further, the high temperature gas generating device 1a according to the second embodiment can be a device capable of automatic operation. In this case, the high temperature gas generator 1a has an automatic supply function of fuel (first fuel and second fuel), a flame detector for confirming ignition and ignition state by a pilot burner, and a function for automatically controlling the flow rate of high temperature combustion gas. It is preferable to provide a regulating valve 13, an automatic ash discharge device, and a function for controlling the amount of high-temperature combustion gas corresponding to the amount of input processing raw material. In the case of a configuration capable of automatic operation, for automatic fuel supply and automatic adjustment of the flow rate of high-temperature combustion gas, the amount of fuel input and the flow rate of high-temperature combustion gas are controlled based on the temperature of the combustion chamber 22a. Is preferable. In other words, in the case of automatic operation, the temperature can be controlled so that the temperature in the combustion chamber 22a is within a certain range by controlling the input amount of fuel and the flow rate of the high-temperature combustion gas. ..

<< Third Embodiment >>
Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 4 is a block diagram showing the high temperature gas generator 1b according to the third embodiment. In the third embodiment, a configuration in which a small high-temperature gas generator 1b is installed in a small-sized furnace 2 such as a deodorizing furnace and a high-temperature gas is supplied to the small-sized furnace 2 will be illustrated and described.

As shown in FIG. 4, the high-temperature gas generator 1b includes a first combustion unit 10a for generating and supplying a high-temperature combustion gas, and a second combustion unit 20b for burning the first fuel and the second fuel. Have. Since the first combustion unit 10a has the same configuration as that of the second embodiment, the description thereof will be omitted. Further, the fuel input section 21a, the combustion chamber 22a, the combustion gas blowing port 23a, the flow path 24a, the ash discharge port 26a, the partition plate 27a, and the ash discharge screw conveyor 28a of the second combustion section 20b are also included in the second embodiment. Since it has the same structure, the explanation is omitted.

On the other hand, the second combustion unit 20b according to the third embodiment has a connecting path 25b for supplying the high temperature gas generated by burning the first fuel and the second fuel in the combustion chamber 22a to the small furnace 2. ing. The high temperature gas passes through the connecting path 25b, is supplied to the small furnace 2, and is used for burning and drying the fuel in the small furnace 2.

Specifically, in the third embodiment, the small furnace 2 includes a hopper 202 for charging fuel into the furnace 201, a transport path 203 and a screw conveyor 204 for transporting fuel to the furnace 201, and a furnace. Of the 201, the screw conveyor 205 for discharging ash for discharging the ash generated by burning the fuel is provided. The fuel charged from the hopper 202 is conveyed in the transport path 203 by the screw conveyor 204 and charged into the furnace 201. Then, the fuel charged into the furnace 201 is burned by the high temperature gas supplied from the high temperature gas generator 1b in the furnace 201, and when ash is generated, the ash is discharged by the ash discharge screw conveyor 205. It is discharged to the outside. If there is a large amount of the second fuel, a second fuel input section may be provided near the outlet of the connecting path 25b (on the small furnace 2 side) so that the second fuel is burned in the small furnace 2. can. In this case as well, it is preferable to provide a screw press type screw conveyor in the charging section to ensure the sealing property of the loading section.

As described above, in the high-temperature gas generator 1b according to the third embodiment, the high-temperature gas generated by burning the first fuel and the second fuel in the second combustion unit 20a while making the high-temperature gas generator 1b compact. Can be supplied to a small furnace 2 such as a deodorizing furnace, and can be used as a heat source for the small furnace 2 and the like.

Although the preferred embodiment of the present invention has been described above, the technical scope of the present invention is not limited to the description of the above embodiment. Various changes and improvements can be added to the above-described embodiments, and those in which such changes or improvements have been made are also included in the technical scope of the present invention.

For example, in the above-described embodiment, a configuration in which waste wood crushed to 5 mm or less is used as the first fuel is exemplified, but the present invention is not limited to this, and for example, seeds of plants containing a large amount of oil and squeezed residue of the seeds can be used. It is also possible to use a fuel crushed to 5 mm or less as the first fuel. Further, in the above-described embodiment, as the second fuel, a raw material having a lower flammability than the first fuel, such as bark wood and branches and leaves, is exemplified, but the present invention is not limited to this, and for example, the second fuel is used as the first fuel. It can also be used as a biomass raw material that is harder to crush than fuel (for example, cannot be crushed to 5 mm or less). The first fuel and the second fuel are not limited to biomass raw materials, but are organic resources, plants, algae, food waste, chicken manure, livestock manure, urban sludge, urine sludge, construction waste, food waste, and waste containing carbon. It is also possible to use plastic or the like.

Further, in the second and third embodiments described above, the fuel inlet 211a is arranged above the combustion gas injection port 23a, but the positions of the fuel inlet 211a and the combustion gas injection port 23a are exchanged. The combustion gas injection port 23a may be arranged above the fuel input port 211a.

Further, in the small high-temperature gas generators 1a and 1b according to the second embodiment or the third embodiment described above, when it is expected that the amount of amorphous wood fuel such as bark will increase as the second fuel. Can be configured such that the combustion chamber 22a of the second combustion portion 20a is formed of a small rotary kiln (φ300 mm or more). In this case, it becomes easy to transfer the second fuel to the inside of the small rotary kiln which is the combustion chamber 22a, and the second fuel is efficiently burned inside the rotary kiln by the high temperature combustion gas generated by the first combustion unit 10a. be able to.

1 ... High temperature gas generator 10 ... 1st combustion unit 11 ... 1st fuel input port 20 ... 2nd combustion unit 21 ... Kiln main body 22 ... 2nd fuel input unit 221 ... Hopper 222 ... Transport path 223 ... Screw conveyor 23 ... Air blowing part 231 ... Air blowing port 30 ... Third combustion part 31 ... Kiln body 32 ... Screw conveyor 33 ... High temperature gas discharge port 1a, 1b ... High temperature gas generator 10a ... First combustion part 20a ... Second combustion part 21a ... Fuel input section 211a ... Fuel input port 212a ... Screw conveyor 22a ... Combustion chamber 23a ... Combustion gas injection port 24a ... Flow path 25a ... High temperature gas discharge port 25b ... Communication path 26a ... Ash discharge port 27a ... Partition plate 28a ... Ash discharge Screw conveyor for 2 ... Small furnace 201 ... Inside the furnace 202 ... Hopper 203 ... Transport path 204 ... Screw conveyor 205 ... Screw conveyor for ash discharge

Claims (9)

A first combustion unit having a first fuel input port for charging a solid or semi-solid first fuel, and incompletely combusting the first fuel charged from the first fuel input port with an amount of air that does not completely burn. When,
It has a second fuel input section for charging a solid or semi-solid second fuel different from the first fuel, and the second fuel is newly charged from the second fuel input section, and the second fuel is charged. The first fuel that communicates with the first combustion unit and is incompletely burned in the first combustion unit is input, the first fuel is used as a fire source, and the second fuel is incompletely burned. It also has a second combustion unit, which burns with an amount of air larger than the amount of air supplied to the first combustion unit.
The first fuel and the second fuel are biomass raw materials, and the second fuel is a fuel that is harder to burn than the first fuel or a fuel that is harder to crush than the first fuel. Device. In the second combustion section, the amount of air that is larger than the amount of air that completely burns the first fuel and the second fuel together with the first fuel that is incompletely burned by the first combustion section. The high temperature gas generator according to claim 1, wherein the fuel is burned in. The high temperature gas generator according to claim 1 or 2, wherein the first combustion unit has a combustion burner. It further has a third combustion unit that burns the combustion residue of the first fuel and the second fuel that did not burn in the second combustion unit and / or the combustible gas generated in the second combustion unit. The high temperature gas generator according to any one of claims 1 to 3. The second combustion unit has a rotary kiln and a plurality of scraping plates installed in the rotary kiln.
In the second combustion unit, the rotary kiln is rotated and the plurality of scraping plates are swiveled around the rotation axis of the rotary kiln to burn the first fuel and the second fuel while stirring. Item 4. The high temperature gas generator according to any one of Items 1 to 4. The high-temperature gas generator according to any one of claims 1 to 5, wherein the first fuel inlet and the second fuel inlet are installed on the same surface side of the high-temperature gas generator. The high-temperature gas generator according to any one of claims 1 to 6, wherein the first fuel is a biomass raw material crushed to 5 mm or less. The first combustion process in which the solid or semi-solid first fuel is incompletely burned with an amount of air that does not completely burn,
The incompletely burned first fuel was charged, and at the same time, the solid or semi-solid second fuel different from the newly introduced first fuel was incompletely burned using the first fuel as a fire source . It has a second combustion step of burning with a larger amount of air than the first combustion step together with the first fuel.
The first fuel and the second fuel are biomass raw materials, and the second fuel is a fuel that is harder to burn than the first fuel or a fuel that is harder to crush than the first fuel. Method. The high-temperature gas generation method according to claim 8 , wherein the first fuel is a biomass raw material pulverized to 5 mm or less.

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