JP7178696B2 - Bamboo biomass fuel conversion process and its biomass boiler - Google Patents

Description

TECHNICAL FIELD The present invention relates to a new biomass fuel conversion process from bamboo and a biomass boiler technology that burns the bamboo biomass fuel produced by the bamboo biomass fuel conversion process.

Currently, the introduction of renewable energy, mainly woody biomass, is being actively promoted. However, demand for wood chips for paper manufacturing and as a fuel for biomass power generation has surged in recent years.

On the other hand, bamboo groves, which have become a serious problem, have been neglected or undeveloped for a long time, causing devastation of satoyama and landslides during localized heavy rains, causing extensive disaster damage in various places.

In order to effectively manage the bamboo forest, which continues to grow at an amazing speed (it takes about 3 years to become mature bamboo), it is necessary to use bamboo as fuel (20 to 30% more heat than wood). Utilization is the best option.

However, in the process of making bamboo biomass fuel so far, the bamboo that has been felled is cut into pieces on site and transported to the drying site as it is. In addition, drying requires a large space and a long time.

In addition, it is necessary to process the bamboo in a dry state into chips, but the diameter of the bamboo is as thick as about 20 cm at maximum, and a large chipper is required to chip it. In the chipping process, there was also the problem of a poor work environment due to excessive noise, dust, and vibration. A large chipper is expensive, consumes a lot of power, and requires high maintenance costs, which has been a factor in the high cost of bamboo chips.

Furthermore, since the branches and leaves of the felled bamboo cannot be used for the current chip burning, they have been discarded locally. Since it is bulky when discarded as it is, a large self-propelled chipper was brought in just for the purpose of disposal, and it was crushed and disposed of. As a result, double waste occurs and is directly reflected in the price of bamboo biomass fuel (bamboo fuel chips).

The structure of a general biomass boiler 100 is shown in FIG. The biomass boiler 100 has a fuel supply device 104 . Chipped biomass fuel chips 101 are put into a fuel hopper 102 of a fuel supply device 104 . The fuel chips 101 agitated by the fuel agitator 103 drop to the screw conveyor 105 of the fuel supply device 104 . Then, the fuel chips 101 are thrown onto the grate 107 in the furnace 106 by the screw conveyor 105 .

The fuel chips 101 are combusted by air sent from the blower 108 passing through the holes 113 of the grate 107 from bottom to top. Ash 114 produced by combustion of fuel chips 101 falls from holes 113 of grate 107 and is collected into ash collection box 112 by screw conveyor 111 of ash discharge device 110 .

However, when the fuel chips 101 made from bamboo are burned in the biomass boiler 100 shown in FIG. 5, the following problems occur.

Bamboo contains a silicon (Si) component and a potassium (K) component. When bamboo is burned as a biomass fuel, potassium oxide (K ₂ O) and silicon dioxide (SiO ₂ ) in the bamboo ash are produced. A eutectic reaction occurs. The melting point of the substance produced by this eutectic reaction is as low as 800° C. or less. During bamboo combustion, the temperature inside the furnace 106 reaches approximately 1000° C., and the material produced by this eutectic melts to generate lava-like clinker (molten ash). Bamboo, in particular, contains more potassium than other biomass fuels and produces more clinker.

The generated clinker spreads over the fire grate 107, clogs the holes 113 of the fire grate 107, inhibits the inflow and exhaust of air in the furnace 106, and makes it impossible to continue combustion. Also, the clinker is very hard and is difficult to remove even by hitting it with a hammer. Furthermore, the falling objects clog the ash discharge device 110 and cause fatal problems including misfire of the biomass boiler 100 .

Combustion methods using a fire grate include a fire grate (fixed bed), vibrating grate, and stepped grate. However, these combustion methods are structurally unable to solve the problem of clinker, since all the combusted material is in contact with the grate. The grate 107 is the basic structure of the biomass boiler 100, and a solution to the clinker problem has been desired.

Since most of the biomass boilers 100 employ the combustion method with the fire grate 107, countermeasures against the bamboo biomass fuel itself have also been proposed. Patent Literature 1 proposes prevention of clinker generation by modifying bamboo to remove potassium from the bamboo and using it as a fuel. In Patent Document 1, bamboo is atomized to a particle size of 6 mm or less, and the atomized bamboo is immersed in normal pressure water to elute and remove potassium and chlorine. And dehydrated bamboo is used as fuel.

Further, Patent Document 2 proposes a combustion apparatus that burns a biomass fuel obtained by mixing bamboo material with bark to prevent generation of clinker. In Patent Document 2, the mixing ratio of the bamboo material and the bark of the biomass fuel is set so that the weight percentage of calcium oxide in the burned ash is greater than the weight percentage of potassium oxide.

JP 2016-125030 A Japanese Patent Application Laid-Open No. 2018-105610

Since the size of fuel chips made from bamboo is not uniform, problems such as clogging tend to occur in fuel supply devices such as screw conveyors. In order to deal with this, all the fuel chips must be discharged from the fuel supply device, which wastes a lot of time and labor.

The method described in Patent Document 1 requires soaking in water and dehydration to modify the bamboo, which increases the number of work steps before the bamboo is used as fuel, resulting in an increase in cost.

The method described in Patent Document 2 requires a bark as well as bamboo as a biomass fuel, and requires a step of mixing the bamboo material with the bark. As a result, the number of work steps required to make fuel increases, and the cost increases.

Therefore, in order to solve the above problems, the present invention proposes a new process for converting bamboo into biomass fuel, and adopts a new combustion method that does not use a grate by burning the bamboo biomass fuel produced by the process. Propose a biomass boiler.

The biomass boiler of the first invention includes a felling process of felling bamboo, a chopping process of chopping the chopped bamboo into pieces of a predetermined length, and a bamboo splitting process of splitting the chopped bamboo along the fiber. , a bundling step of bundling split bamboo to form a bamboo fuel bundle having a predetermined diameter, and a drying step of drying the bamboo fuel bundle . A biomass boiler comprising a furnace for burning the bamboo bundle fuel, comprising a fuel supply device for supplying the bamboo bundle fuel to the furnace, wherein the fuel supply device directs the bamboo bundle into the furnace. The furnace is provided with a fuel pushing mechanism for pushing the fuel in the longitudinal direction according to its combustion, and the burning part of the bundle of bamboo fuel supported by the fuel supply device is sequentially displaced from one longitudinal end to the other longitudinal end. It is characterized by burning while

The biomass boiler of the first invention is equipped with a furnace for burning bamboo fuel bundles produced by the bamboo biomass fuel conversion process, and does not require a grate, so that the problem of clinker does not occur. In addition, bundled bamboo fuel does not cause problems such as clogging in the fuel supply device. Since the bundled bamboo fuel is carried out in a state in which the bamboo is split and bound, the volume is reduced and no loading loss occurs during transportation. The self-propelled bamboo splitter and the self-propelled tying machine used to generate bundled bamboo fuel are both self-propelled, so the logging site becomes a bamboo biomass fuel factory. Since the bundled bamboo fuel is dried in the form of split bamboo, the drying period can be shortened to about half or less compared to the conventional method.
In addition, the biomass boiler of the first invention burns bundled bamboo fuel in a furnace instead of conventional fuel chips made from bamboo as a raw material and does not require a grate, so it burns without retaining ash and generates clinker. It can prevent and produce bamboo charcoal at the same time.
Further, in the biomass boiler of the first invention, the fuel supply device is provided with a fuel pushing mechanism for pushing the bamboo fuel bundle into the furnace in the longitudinal direction according to its combustion. Since the burning part of the bundle of bamboo fuel is sequentially displaced from one end to the other in the longitudinal direction, the bundle of bamboo fuel can be burned continuously.

The bamboo biomass fuel conversion process of the second invention is characterized in that the bundling step is a bundling step of bundling branches and leaves of felled bamboo in addition to the split bamboo and bundling them so as to form bundles of bamboo fuel having a predetermined diameter. Characterized by

According to the bamboo biomass fuel conversion process of the second invention, even bamboo branches and leaves that have conventionally been discarded are bundled into bundle-shaped bamboo fuel and converted into fuel, so that fuel costs can be reduced through resource saving.

In the biomass boiler of the third aspect of the invention, the fuel supply device further comprises a fuel hopper in front of the fuel push-in mechanism, and the fuel hopper feeds the bundled bamboo fuel introduced into the inlet into the fuel push-in mechanism. It is characterized by supplying

In the biomass boiler of the third invention, the fuel hopper of the fuel supply device supplies the bamboo fuel bundles to the fuel push-in mechanism, so that a large amount of bamboo fuel bundles can be continuously burned in the furnace.

In the biomass boiler of the fourth invention, the fuel supply device includes a plurality of the fuel push-in mechanisms, and the fuel supply device changes the amount of heat generated in the furnace by changing the number of the fuel push-in mechanisms to be operated. It is characterized by

The biomass boiler of the fourth invention is capable of responding to sudden changes in heat demand, which has been impossible with conventional biomass boilers, and can be used in a wide range of applications.

The bamboo biomass fuel conversion process of the present invention does not require fuel chipping, so problems such as clogging do not occur, and a large chipper is not required. In addition, the biomass boiler of the present invention can employ a combustion system that does not use a grate, which solves the problem of clinker.

FIG. 2 is an explanatory view of the essential parts of the bamboo biomass fuel conversion process of the present invention. 1 is a biomass boiler of the present invention. FIG. 2 is a diagram illustrating specific execution of the bamboo biomass fuel conversion process of the present invention. It is a figure explaining an example of thermal power control in the biomass boiler of this invention. It is a structural diagram of a general biomass boiler.

(Fuel conversion process)
FIG. 1 shows an explanatory view of the essential parts of the bamboo biomass fuel conversion process of the present invention. FIG. 1(a) shows a piece of bamboo 1 cut into pieces having a length L of 200 to 300 cm after felling in a forest.

FIG. 1(b) is an explanatory view of splitting the bamboo 1 that has been cut into pieces. As shown in FIG. 1(b), one end of the cut bamboo 1 is pressed against a bamboo splitter 2, and the other end of the bamboo 1 is moved in the longitudinal direction by force F. As shown in FIG. The bamboo splitter 2 is radially provided with a plurality of cutting edges 4 each having a length corresponding to the diameter of the annular portion 6 . The cutting blades 4 are arranged so as to divide the inside of the annular portion 6 into six chambers. As shown in FIG. 1(b), when the bamboo 1 passes through the bamboo splitter 2, it is split into a plurality of split bamboos 3. As shown in FIG.

FIG. 1(c) shows a bamboo fuel bundle 5 in which split bamboo 3 is bound with a binding band 4. FIG. The bamboo fuel bundle 5 is formed to have a length L of 200 to 300 cm and a diameter φD of 30 to 60 cm. The bundled bamboo fuel 5 may bundle only the split bamboo 3, or may bundle the branches and leaves in addition to the split bamboo 3. - 特許庁The binding band 4 has sufficient strength to move, store, etc. the bamboo fuel bundle 5 . Furthermore, the material of the binding band 4 is combustible and harmless even if it burns.

(biomass boiler)
FIG. 2 shows a biomass boiler 10 of the present invention using bamboo biomass fuel (bundle-shaped bamboo fuel 5) produced by the bamboo biomass fuel conversion process described above.

The biomass boiler 10 has a tubular body 9 that is erected. A fuel supply device 12 is provided to supply a bundle of bamboo fuel 5 to a furnace 11 below the inside of the body 9 . The fuel supply device 12 is provided with a fuel push-in mechanism 13 that pushes the bundle of bamboo fuel 5 into the furnace 11 in the longitudinal direction as it burns. The fuel supply device 12 also has a fuel hopper 14 in front of the fuel push-in mechanism 13 .

The fuel push-in mechanism 13 is composed of a horizontally installed guide portion 15 and a push-in cylinder 16 . The inner dimension of the guide portion 15 is slightly larger than the outer diameter of the bamboo fuel bundle 5 so that the bamboo fuel bundle 5 can move in the longitudinal direction. The guide part 15 is arranged on the side surface of the body 9 toward the interior of the furnace 11 . The tip portion 17 of the guide portion 15 supports the bamboo fuel bundle 5 during combustion.

A pushing cylinder 16 is arranged at the rear end portion 18 of the guide portion 15 . A pushing plate 21 having approximately the same diameter as the bamboo fuel bundle 5 is provided at the tip of the rod 20 of the pushing cylinder 16 . The pushing cylinder 16 is a double-acting hydraulic cylinder, and is adapted to extend and contract by hydraulic pressure supplied from the hydraulic unit 22 .

An intermediate portion 23 of the guide portion 15 is open upward and formed integrally with the lower portion of the fuel storage portion 24 of the fuel hopper 14 . A flap 26 that can be opened and closed is installed at the opening of the intermediate portion 23 . The intermediate part 23 is always closed by a flap 26, and the flap 26 is opened only when the bamboo fuel bundle 5 passes through. The fuel storage part 24 is a hollow container with a rectangular cross section inside, which has a dimension that allows the bamboo fuel bundle 5 to be accommodated with a margin. The fuel storage part 24 has a vertically elongated structure so that the bamboo fuel bundles 5 can be stacked. The upper end of the fuel storage part 24 is open, and serves as an inlet 25 for the bamboo fuel bundle 24 into the fuel hopper 14 .

A blower 30 is arranged below the fuel supply device 12 . Air from the blower 30 is sent inside the fuselage 9 by the blowing duct 31 . Air is blown from a blowing port 32 at the tip of the blowing duct 31 toward a burning portion 33 of the bamboo fuel bundle 5. - 特許庁

An ignition burner 34 is arranged in the lower part of the body 9 . The crater 35 of the ignition burner 34 is directed toward the bundled bamboo fuel 5 of the fuel push-in mechanism 13 . Liquid or gas ignition fuel is supplied to the ignition burner 34 .

The body 9 is provided with an observation window 37 fitted with heat-resistant glass 38 . A monitoring camera 36 is arranged outside the observation window 37 . The surveillance camera 36 photographs the combustion state of the bamboo fuel bundle 5 in the furnace 11 through the heat-resistant glass 38 .

A water tube 40 formed in a spiral shape is arranged inside the upper portion of the body 9 . Water is supplied to the upper end 41 of the water pipe 40 through a water supply pipe 42 . Hot water is taken out from the lower end 43 of the water pipe 40 through a hot water pipe 44 . It goes without saying that the heat energy generated in the biomass boiler 10 can be taken out not only with hot water but also with steam, warm air, or the like.

Combustion gas that has heated the water inside the water tube 40 is led to a chimney (not shown) through an exhaust port 45 in the upper part of the body 9 . Arrow 46 indicates the direction in which the combustion gases are exhausted.

An ash receiving portion 50 is formed in the lower portion of the body 9 . The ash receiver 50 is formed in the shape of a truncated cone that tapers downward. A discharge port 51 is provided at the lower end of the ash receiver 50 . The outlet 51 is continuous with the inlet 52 of the screw conveyor 53 . A screw 54 of the screw conveyor 53 is rotationally driven by a motor 55 . An ash collection box 57 is placed below the outlet 56 of the screw conveyor 53 . Ash 58 and bamboo charcoal 59 are collected in the ash collection box 57 .

The structure of the control part 60 which controls the biomass boiler 10 mentioned above is as follows. An image signal of the bamboo fuel bundle 5 photographed by the monitoring camera 36 is sent to the controller 61 . The controller 61 processes the image of the bundled bamboo fuel 5 that has been sent, and analyzes the image processing result to determine the combustion state of the bamboo fuel bundle 5 . That is, the ignition state, combustion temperature, combustion range, which part of the bamboo fuel bundle 5 is burning, etc. are grasped.

The controller 60 outputs a drive signal to each actuator according to the determination of the combustion state of the bundled bamboo fuel 5 . That is, when the bundled bamboo fuel 5 needs to be ignited, the controller 60 outputs a drive signal to the ignition burner 34 . A drive signal is output to the blower 30 when it is necessary to start/stop blowing air to the bamboo fuel bundle 5 or to increase or decrease the amount of air blown. A drive signal is output to the hydraulic unit 22 when the bundle of bamboo fuel 5 needs to be pushed by the fuel pushing mechanism 13 . When the screw conveyor 53 needs to discharge the ash and bamboo charcoal, a drive signal is output to the motor 55 .

(Execution of fuel conversion process)
Based on FIG. 3, specific execution of the bamboo biomass fuel conversion process described above will be described.

FIG. 3(a) shows bamboo 70 in bamboo grove 69 (on site). In the felling process, the bamboo 70 is felled. In the next cutting step, the cut bamboo 70 and branches and leaves 68 are cut into pieces of a predetermined length. The cut bamboo 1 is in the state shown in FIG. 1(a).

FIG. 3(b) shows a bamboo splitting process in which the cut bamboo 1 is split along the fibers of the bamboo 1 using a small self-propelled bamboo splitter 71. FIG. The self-propelled bamboo splitter 71 has a bamboo splitter 2 (see FIG. 1B) at the front end of a frame 75 and a hydraulic bamboo pusher 74 at the rear end of the frame 75 . In FIG. 3(b), the bamboo 1 is set between the bamboo splitting metal fitting 2 and the presser metal 76 of the hydraulic bamboo pushing device 74, and the bamboo 1 is pushed in the direction of the bamboo splitting metal fitting 2 to split the bamboo 1. showing work. The hydraulic bamboo pushing device 74 is driven by hydraulic pressure generated by a hydraulic pump (not shown) driven by an engine (not shown) mounted on the self-propelled bamboo splitter 71 .

The self-propelled bamboo splitter 71 has a crawler 73 and is driven by an engine (not shown) so that it can travel. Therefore, the self-propelled bamboo splitter 71 can self-propel to the bamboo grove 69 where the bamboo 70 grows. The bamboo 1 that has been felled and cut into pieces in the bamboo grove 69 can be split as it is on site.

FIG. 3(c) shows a binding step of binding split bamboo 3 into a bundle of bamboo fuel 5 having a predetermined diameter using a small self-propelled binding machine 77. FIG. FIG. 3(c) shows the operation of setting the split bamboo 3 between the support portion 78 and the compression portion 80 of the self-propelled binding machine 77 and compressing the split bamboo 3 by the compression portion 80. FIG. Simultaneously with the compression, the bundled bamboo fuel 5 is bound with a binding band 4 (see FIG. 1(c)). In the self-propelled binding machine 77, a hydraulic pump (not shown) is driven by an engine (not shown) mounted on the self-propelled binding machine 77, and the generated hydraulic pressure drives the compressor 80.

The self-propelled binding machine 77 has a crawler 79 and is driven by an engine (not shown) so that it can travel. Therefore, the self-propelled binding machine 77 can also self-propel to the bamboo grove 69 where the bamboo 70 grows. The split bamboo 3 cut, cut into pieces, and split in the bamboo grove 69 can be bundled into the bundled bamboo fuel 5 as it is on site. At this time, in addition to the split bamboo 3, the cut bamboo branches and leaves are bundled together. As a result, branches and leaves that have been discarded locally without being used in the past can also be turned into fuel. Therefore, fuel cost can be lowered by saving resources.

As shown in FIG. 3(d), the locally produced bundled bamboo fuel 5 is loaded onto a light truck 81 and transported to a gathering place (dry land) for the bundled bamboo fuel 5 near the biomass boiler 10. . At this time, since the cut bamboo 1 is carried out in a state of splitting and binding, the bulk is reduced and no loading loss occurs. At the collection site, the bamboo fuel bundles 5 are dried to a predetermined moisture content suitable for combustion.

As described above, according to the bamboo biomass fuel conversion process of the present invention, the bundle-shaped bamboo fuel 5, which is a new bamboo biomass fuel, can be locally produced. This eliminates the need for a large and expensive chipper, which is required for conventional fuel chip production. In addition, the bamboo 1 is split by a small self-propelled bamboo splitter, and the split bamboo 3 and branches and leaves are bound by a small self-propelled tying machine. All can be completed. Therefore, energy saving and efficiency improvement can be achieved in the bamboo biomass fuel conversion process.

(Operation of biomass boiler)
The biomass boiler 10 of the present invention described above is operated as follows.

A plurality of dried bamboo fuel bundles 5 are put into the inlet 25 of the fuel hopper 14 of the biomass boiler 10 shown in FIG. Then, the bamboo fuel bundle 5 is supplied from the fuel hopper 14 to the fuel pushing mechanism 13 . The bundle of bamboo fuel 5 in the guide portion 15 of the fuel pushing mechanism 13 is pushed out by the pushing plate 21 of the pushing cylinder 16 until a portion thereof protrudes from the tip portion 17 of the guide portion 15 . At this time, by recognizing the image from the surveillance camera 36, the controller 61 of the control unit 60 recognizes that the preparation for igniting the bamboo fuel bundle 5 is completed.

A drive signal is issued from the controller 61 to the ignition burner 34 , and flame is jetted from the crater 35 toward the tip of the bundle of bamboo fuel 5 . At the same time, the controller 61 issues a drive signal to the blower 30 and blows air from the blower port 32 toward the tip of the bamboo fuel bundle 5 . As a result, the tip of the bundle of bamboo fuel 5 is ignited, and the ignited tip (combustion part 33) starts burning vigorously.

The controller 61 constantly monitors images of the combustion state of the combustion section 33 . As the combustion in the combustion section 33 progresses, the controller 61 outputs a drive signal to the hydraulic unit 22 of the fuel push-in mechanism 13 . Then, hydraulic pressure is supplied from the hydraulic unit 22 to the pushing cylinder 16, and the pushing cylinder 16 extends. The bamboo fuel bundle 5 pushed by the pushing plate 21 is guided by the guide part 15 and moves toward the center of the furnace 11 by an optimum distance. When the remaining amount of the bundled bamboo fuel 5 becomes small, the next bundled bamboo fuel 5 is fed by the fuel push-in mechanism 13 and burned continuously before it burns out. In this manner, the optimum combustion state of the bundled bamboo fuel 5 in the furnace 11 of the biomass boiler 10 is automatically continued by the control unit 60 .

Water is supplied from a water supply passage 42 to the upper end 41 of the water pipe 40 in the upper portion of the body 9 of the biomass boiler 10 . Steam generated in the water pipe 40 is discharged from the lower end 43 of the water pipe 40 toward the steam pipe 44 . The discharged steam is used as a power source or heat source for various devices installed adjacent to the biomass boiler 10 .

Ash and bamboo charcoal generated in the combustion part 33 fall toward the ash receiving part 50 of the body 9. - 特許庁Since the biomass boiler 10 of the present invention does not have the grate 107 (see FIG. 5) of the conventional biomass boiler 100, clinker does not adhere to the grate 107. FIG. As a result, the ash and bamboo charcoal fall into the inlet 52 of the screw conveyor 53 and are carried into the ash recovery box 57 by the screw 54 . Bamboo charcoal, co-produced as a by-product of combustion, is very useful as an agricultural soil conditioner. The amount of bamboo charcoal collected can also be controlled by adjusting fuel supply and combustion air.

As described above, the biomass boiler 10 of the present invention shown in FIG. 2 does not have the fire grate 107 (see FIG. 5) at all, so bamboo biomass fuel can be burned without problems caused by clinker. In the biomass boiler 10 of the present invention, the opening of the fuel supply device 12 is φ30 cm or more, and the problem of clogging with biomass fuel does not occur. Also, bamboo biomass fuel can be burned without requiring bamboo modification or other combustion materials.

Since the biomass boiler 10 of the present invention has a simple structure with a small number of parts by reviewing the structure itself without using special parts, annual maintenance costs and power consumption can be greatly reduced. In addition, the adoption of a new combustion method prevents the formation of clinker and achieves highly efficient combustion, so thermal energy can be efficiently produced at low cost. Furthermore, by adopting the bamboo biomass fuel conversion process and fuel supply system of the present invention, it is possible to supply fuel without problems, realize continuous operation of the biomass boiler 10, and eliminate loss during operation.

FIG. 4 is a diagram illustrating an example of thermal power adjustment suitable for the biomass boiler 10 of the present invention. FIG. 4(a) is a cross-sectional view of the combustion point 33 of the biomass boiler 10 shown in FIG. 2 as viewed from above. Three fuel pushing mechanisms 13 are provided toward the furnace 11 inside the body 9 . In FIG. 4(a), all the three fuel pushing mechanisms 13 project the bamboo fuel bundles 5 into the furnace 11, and the three bamboo fuel bundles 5 are burning at the same time. That is, in this state, the biomass boiler 10 is operated with maximum thermal power.

Next, in FIG. 4(b), two of the three fuel pushing mechanisms 13 project the bamboo fuel bundles 5 into the furnace 11, and the two bamboo fuel bundles 5 are combusted at the same time. On the other hand, one fuel push-in mechanism 13 does not project the bamboo fuel bundle 5 into the furnace 11 and stops burning the bamboo fuel bundle 5 . That is, in this state, the biomass boiler 10 is operated with intermediate thermal power.

Furthermore, in FIG. 4(c), one of the three fuel pushing mechanisms 13 protrudes the bamboo fuel bundle 5 into the furnace 11, and only one bamboo fuel bundle 5 is burning. The remaining two fuel push-in mechanisms 13 do not project the bamboo fuel bundle 5 into the furnace 11 and stop burning the bamboo fuel bundle 5 . That is, in this state, the biomass boiler 10 is operated with the minimum thermal power.

Thus, by providing a plurality of fuel push-in mechanisms 13 and changing the number of fuel push-in mechanisms 13 to be operated, the thermal power of the biomass boiler 10 can be adjusted.

1: Bamboo 3: Split bamboo 5: Bundled bamboo fuel 10: Biomass boiler 11: Furnace 12: Fuel supply device 13: Fuel pushing mechanism 14: Fuel hopper 25: Input port

Claims (4)

A logging process of cutting bamboo, a cutting process of cutting the cut bamboo into pieces of a predetermined length, a bamboo splitting process of splitting the cut bamboo along the fiber, and a predetermined diameter by bundling the split bamboo. and a drying step of drying the bundled bamboo fuel. A biomass boiler comprising
A fuel supply device for supplying the bundled bamboo fuel to the furnace,
The fuel supply device includes a fuel pushing mechanism for pushing the bundled bamboo fuel into the furnace in a longitudinal direction according to its combustion,
A biomass boiler characterized in that, in the furnace, the bundle of bamboo fuel is burned while being sequentially displaced from one longitudinal end to the other longitudinal end of the bundle of bamboo fuel while being supported by the fuel supply device. The bundling step is a bundling step of bundling branches and leaves of felled bamboo in addition to the split bamboo and bundling them so as to form bundled bamboo fuel having a predetermined diameter.
A biomass boiler according to claim 1. The fuel supply device further comprises a fuel hopper in front of the fuel push-in mechanism,
The fuel hopper is characterized by supplying the bundled bamboo fuel that has been put into the inlet of the fuel hopper to the fuel push-in mechanism,
A biomass boiler according to claim 1 or 2 . The fuel supply device includes a plurality of the fuel pushing mechanisms,
The fuel supply device changes the amount of heat generated in the furnace by changing the number of the fuel pushing mechanisms to be operated,
A biomass boiler according to any one of claims 1 to 3 .

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