Carbide production system and carbide production method

Abstract

A carbide production system (1) is provided with: a combustion furnace (10) that includes a combustion chamber (12) that has a first biomass supply port (17) for supplying a first biomass and combusts the first biomass with air; and a carbide recovery device (40) that is connected to the combustion furnace (10) and that recovers carbide generated from the second biological substance. The second biological substance is supplied to a carbonization region through a second biological substance supply port (18) provided downstream of the first biological substance supply port (17), wherein the carbonization region is heated by the combustion of the first biological substance and contains low-concentration oxygen gas having an oxygen concentration lower than that of the air by the combustion of the first biological substance.

Description

Technical Field

[0001] The present disclosure relates to a carbide manufacturing system and a carbide manufacturing method. Background Art

[0002] Conventionally, there is known a method for producing carbide by heating biomass. Since carbon in the biomass is fixed as carbide, the production of carbide from biomass can suppress the emission of carbon dioxide into the atmosphere compared to the case of burning biomass.

[0003] Patent document 1 discloses a self-igniting carbonization heat treatment device, which includes: a cylindrical main body; a cover body that closes the upper opening of the main body; a partition plate with air holes that is arranged at a position away from the bottom plate; and an air supply path that introduces air into an air supply chamber formed between the bottom plate and the partition plate. In addition, Patent document 1 discloses that the self-igniting carbonization heat treatment device includes a plurality of air supply cylinders with air holes that are erected on the partition plate in a state of being connected to the air holes of the partition plate.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent No. 6285588 Summary of the invention

[0007] Problems to be solved by the invention

[0008] The above-mentioned spontaneous combustion carbonization heat treatment device generates carbides in advance in an intermittent manner, and requires cooling time when taking out the carbides and time for inputting raw materials, so continuous processing cannot be performed, and the productivity is low. In addition, in the above-mentioned spontaneous combustion carbonization heat treatment device, the raw materials spontaneously burn under oxygen deficiency, and the raw materials are carbonized in the same area as the combustion area. Therefore, the conditions for generating carbides may be unstable. In such a case, it is possible that the biomass burns more than required, the amount of carbides obtained is reduced, and the properties of the carbides are unstable.

[0009] Therefore, an object of the present disclosure is to provide a carbide production system and a carbide production method which can continuously produce stable carbide from biomass.

[0010] Solutions to Solve Problems

[0011] The carbonized product manufacturing system according to the present disclosure comprises: a combustion furnace including a first biomass supply port for supplying a first biomass and a combustion chamber for burning the first biomass with air; and a carbonized product recovery device connected to the combustion furnace for recovering carbonized products generated from a second biomass. The second biomass is supplied to a carbonization region heated by the combustion of the first biomass and having a low-concentration oxygen concentration lower than air due to the combustion of the first biomass through a second biomass supply port provided at a position downstream of the first biomass supply port.

[0012] Alternatively, the combustion furnace may be a vertical combustion furnace.

[0013] The combustion chamber may be provided with a second biomass supply port for supplying the second biomass into the combustion chamber. Carbonized matter may be generated in the combustion chamber.

[0014] Alternatively, the combustion furnace and the carbonized material recovery device may be connected via a connecting flow channel. Alternatively, a second biomass supply port for supplying a second biomass into the connecting flow channel may be provided in the connecting flow channel. Alternatively, the carbonized material may be generated in the connecting flow channel.

[0015] Alternatively, the combustion furnace and the carbonized material recovery device may be connected via a connecting flow passage. Alternatively, the connecting flow passage may be provided with an air supply port for supplying air into the connecting flow passage.

[0016] Alternatively, the carbide recovery device may include a cyclone separator.

[0017] Alternatively, the carbide production system further includes a gas utilization device that utilizes the gas exhausted from the carbide recovery device. Alternatively, the carbide is cooled in the carbide recovery device by gas that originates from the gas exhausted from the carbide recovery device and is cooled by heat exchange in the gas utilization device.

[0018] The carbonization method of the present disclosure includes a step of burning a first biomass supplied to a combustion chamber of a combustion furnace using air. The carbonization method includes a step of supplying a second biomass to a carbonization region which is located downstream of the first biomass and is heated by the combustion of the first biomass and has a low-concentration oxygen concentration lower than that of air due to the combustion of the first biomass. The carbonization method includes a step of recovering the carbonization generated by the second biomass using a carbonization recovery device connected to the combustion furnace.

[0019] Effects of the Invention

[0020] According to the present disclosure, it is possible to provide a carbide production system and a carbide production method capable of continuously producing stable carbide from biomass. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram showing a carbide production system according to one embodiment.

[0022] Figure 2 It is a schematic diagram showing the state near the second biomass supply port.

[0023] Figure 3 It is cut with III-III line Figure 2 sectional view of .

[0024] Figure 4 This is a schematic diagram showing a state near a second biomass supply port according to another embodiment.

[0025] Figure 5 It is cut along the VV line Figure 4 sectional view of .

[0026] Figure 6 This is a schematic diagram showing a state near a second biomass supply port according to another embodiment.

[0027] Figure 7 The section is made along line VII-VII. Figure 6 sectional view of .

[0028] Figure 8 It is a schematic diagram showing a carbide production system according to one embodiment.

[0029] Fig. 9 It is a schematic diagram showing a carbide production system according to one embodiment. DETAILED DESCRIPTION

[0030] Hereinafter, several exemplary embodiments will be described with reference to the drawings. In addition, the dimensional ratios in the drawings are exaggerated for convenience of description and may be different from the actual ratios.

[0031] [First embodiment]

[0032] First, use Figure 1 to Figure 7 A carbide manufacturing system 1 according to the first embodiment will be described. Figure 1 As shown, the carbonized material production system 1 according to the present embodiment includes a combustion furnace 10 and a carbonized material recovery device 40. The combustion furnace 10 is configured to burn the first biomass. The carbonized material recovery device 40 recovers the carbonized material. As described later, the carbonized material is generated from the second biomass.

[0033] In the present embodiment, the combustion furnace 10 is a vertical fluidized bed combustion furnace. In addition, the vertical combustion furnace is excellent in that a large installation area is not required, but the combustion furnace 10 is not limited to the vertical combustion furnace, and may also be a horizontal combustion furnace. In addition, the combustion furnace 10 is not limited to the fluidized bed combustion furnace, and may also be a rotary combustion furnace such as a grate combustion furnace or a kiln combustion furnace.

[0034] The combustion furnace 10 includes a wind box 11 and a combustion chamber 12 disposed vertically above the wind box 11. The wind box 11 is a room for supplying combustion air. The combustion chamber 12 is a room for burning the first biomass with air. The wind box 11 and the combustion chamber 12 are divided by an air dispersion plate 13. The air dispersion plate 13 has a plurality of first air supply holes 14.

[0035] The plurality of first air supply holes 14 are first air supply ports for supplying air to the combustion chamber 12. The air supplied through the first air supply holes 14 is primary air. The primary air is supplied to the fluid medium 15 and is mainly used for combustion. The air supplied from the air supply unit 20 is supplied to the combustion chamber 12 through the wind box 11 and the plurality of first air supply holes 14. In addition, in the present embodiment, the air diffusion method of the combustion furnace 10 is a dispersion plate type, but it may also be an air diffusion pipe type, or a combination thereof.

[0036] The air supply unit 20 is connected to the wind box 11. The air supply unit 20 includes an air flow passage 21, an air inlet 22, and a blower 23. The air flow passage 21 is provided with the air inlet 22 and the blower 23. In addition, a flow rate adjustment damper 24 is provided in the air flow passage 21 between the air inlet 22 and the blower 23. In addition, a flow rate adjustment damper 25 is provided in the air flow passage 21 between the blower 23 and the wind box 11. And, by driving the blower 23 in a state where the flow rate adjustment damper 24 and the flow rate adjustment damper 25 are opened, air can be continuously supplied from the air inlet 22 to the wind box 11.

[0037] In the combustion chamber 12, a fluid medium 15 is arranged on the air dispersion plate 13. The fluid medium 15 may also include inert particles such as silica sand. When air is supplied from the wind box 11 to the combustion chamber 12 through the first air supply hole 14 of the air dispersion plate 13, the fluid medium 15 becomes fluidized to form a fluidized layer. The air ratio in the fluidized layer may be about 0.5 to 1.5.

[0038] The combustion chamber 12 is provided with a second air supply port 16 , a first biomass supply port 17 , a second biomass supply port 18 a , and an exhaust port 19 .

[0039] The second air supply port 16 is a supply port for supplying air to the combustion chamber 12. The second air supply port 16 is provided on a side wall constituting the combustion chamber 12. The second air supply port 16 is provided at a position vertically above the first air supply hole 14 and vertically below the second biomass supply port 18a and the exhaust port 19. The air supplied through the second air supply port 16 is secondary air. Supplying secondary air to the combustion chamber 12 enables staged combustion at a temperature higher than the combustion temperature obtained by primary air, thereby suppressing the fluid medium 15 from being adhered to by heat. In addition, the oxygen concentration in the carbonization region described later can also be adjusted by using the secondary air.

[0040] The air flow passage 21 is connected to the second air supply port 16. The air flow passage 21 branches between the blower 23 and the flow rate adjustment damper 25. The branched air flow passage 21 is provided with a flow rate adjustment damper 26 and a flow rate adjustment damper 27. The blower 23 is driven in a state where the flow rate adjustment damper 24, the flow rate adjustment damper 26, and the flow rate adjustment damper 27 are opened, so that air can be continuously supplied from the air inlet 22 to the combustion chamber 12 via the second air supply port 16.

[0041] The first biomass supply port 17 is a supply port for supplying the first biomass to the combustion chamber 12. Since the first biomass can be supplied to the combustion chamber 12 via the first biomass supply port 17, the first biomass can be continuously supplied to the combustion chamber 12. Biomass is positioned as a renewable energy source, and from the perspective of carbon neutrality, it is believed that even if the biomass is burned, it will not lead to an increase in carbon dioxide released into the atmosphere. By burning the first biomass, the use of fossil fuels can be reduced and the release of carbon dioxide into the atmosphere can be suppressed.

[0042] The first biomass supply port 17 is provided on the side wall constituting the combustion chamber 12. The first biomass supply port 17 is provided at a position vertically above the first air supply hole 14. The first biomass supply unit 30 for supplying the first biomass to the combustion chamber 12 of the combustion furnace 10 is connected to the first biomass supply port 17. The first biomass supplied to the combustion chamber 12 by the first biomass supply unit 30 is stirred and burned together with the fluid medium 15.

[0043] The second biomass supply port 18a is a supply port for supplying the second biomass into the combustion chamber 12. When the second biomass is supplied into the combustion chamber 12, carbonized products are generated in the combustion chamber 12. Since the second biomass can be supplied to the combustion chamber 12 via the second biomass supply port 18a, the second biomass can be continuously supplied to the combustion chamber 12. The second biomass supply port 18a is provided at a side wall constituting the combustion chamber 12. The second biomass supply port 18a is provided at a position downstream of the first biomass supply port 17. Specifically, the second biomass supply port 18a is provided at a position vertically upward of the first biomass supply port 17. In addition, the second biomass supply port 18a is provided at a position downstream of the first air supply hole 14. The second biomass supply unit 31 for supplying the second biomass to the combustion chamber 12 is connected to the second biomass supply port 18a. The second biomass supplied to the combustion chamber 12 by the second biomass supply unit 31 is carbonized as described later, and carbonized products are generated from the second biomass.

[0044] The second biomass is supplied to the carbonization region heated by the combustion of the first biomass and having a low concentration of oxygen lower than air due to the combustion of the first biomass through the second biomass supply port 18a. The carbonization region is maintained at a temperature suitable for generating carbides and a low oxygen concentration, and the second biomass is supplied in such a controlled atmosphere. The second biomass is heated by the high-temperature gas generated by the combustion of the first biomass. Therefore, the pyrolysis of the second biomass is stably performed, and carbides can be stably generated from the second biomass.

[0045] The properties of the generated carbonized product vary depending on the type and drying state of the second biomass, the amount of the second biomass supplied, the temperature of the carbonization region, the oxygen concentration of the carbonization region, etc. Therefore, the conditions of the amount of the second biomass supplied, the temperature of the carbonization region, and the oxygen concentration of the carbonization region may be determined in advance by a test run according to the properties of the carbonized product to be produced.

[0046] The exhaust port 19 is an exhaust port for exhausting the gas after the combustion of the first biomass. When carbide is generated by the second biomass in the combustion chamber 12, the carbide is also discharged through the exhaust port 19. The carbide can be discharged from the exhaust port 19 by the combustion gas whose volume is expanded due to combustion. The exhaust port 19 is arranged at a position higher in the vertical direction than the first air supply hole 14, the second air supply port 16, the first biomass supply port 17 and the second biomass supply port 18a. Specifically, the exhaust port 19 is arranged on the ceiling constituting the combustion chamber 12. The exhaust port 19 is connected to the first connecting flow channel 36.

[0047] The first biomass and the second biomass may be biomass of the same type or biomass of different types. Biomass may include, for example, herbaceous wood, domestic wastewater such as livestock excrement, sewage sludge and septic tank sludge, and organic matter such as food waste. Biomass may include at least one of waste biomass and unused biomass. Waste biomass may also include livestock excrement such as chicken manure. Unused biomass may include at least one of the inedible parts of crops, forest residues, bamboo and small bamboo. The inedible parts of crops may include at least one selected from rice husks, rice straw, wheat straw, corn stalks, palm empty fruit ears (EFB), palm trunks (OPT) and palm kernel shells (PKS). Biomass may include at least one of herbaceous biomass and woody biomass. Woody biomass may include at least one of thinning materials and pruned branches. Among these, the biomass preferably includes at least one selected from the group consisting of rice husks, rice straw, wheat straw, chicken manure, corn stalks, bamboo, small bamboo, thinning materials, and pruned branches, from the viewpoint of the amount and weight of the biomass.

[0048] The first biomass supply unit 30 and the second biomass supply unit 31 may each include a continuous supply type feeder such as a screw feeder and a table feeder. In addition, the first biomass supply unit 30 and the second biomass supply unit 31 may also include a weight feeder such as a weight loss feeder or a volumetric feeder. In addition, the amount of the second biomass supplied from the second biomass supply unit 31 may be greater than the amount of the first biomass supplied from the first biomass supply unit 30. The amount of the second biomass supplied from the second biomass supply unit 31 may be, for example, more than 2 times and less than 10 times the amount of the first biomass supplied from the first biomass supply unit 30.

[0049] The carbonization system 1 may include a first pulverizer 32 and a second pulverizer 33. The first pulverizer 32 pulverizes the first biomass and the second biomass. The second pulverizer 33 further pulverizes the second biomass pulverized by the first pulverizer 32. The first biomass is pulverized by the first pulverizer 32, so that the first biomass can be pulverized into a size suitable for combustion. In addition, the second biomass is pulverized by the first pulverizer 32 and the second pulverizer 33 to reduce the particle size, so that the carbonization of the second biomass can be facilitated and the transfer to the carbonization recovery device 40 can be facilitated. The second biomass supplied through the second biomass supply port 18a may also be smaller in size than the first biomass supplied through the first biomass supply port 17. In addition, when the first biomass and the second biomass are of the optimal size, the first biomass and the second biomass may not be pulverized by the first pulverizer 32 and the second pulverizer 33.

[0050] The carbonization system 1 may include at least one selected from a magnetic separator, a wind separator, and a particle size separator (not shown). These separators can remove foreign matter such as metal or concrete pieces from the first biomass supplied by the first biomass supply unit 30 and the second biomass supplied by the second biomass supply unit 31.

[0051] The combustion furnace 10 may also include a thermometer 34 for measuring the temperature at the upper side of the second air supply port 16 in the vertical direction and at the lower side of the exhaust port 19 in the combustion chamber 12. The temperature of the carbonization region is measured by the thermometer 34, so that the carbonization temperature can be easily controlled. The temperature of the carbonization region can be about 700°C to 1200°C. When the temperature of the carbonization region is set to 700°C or more, carbonization can be easily performed even when a large amount of water is contained in the second biomass. In addition, when the temperature of the carbonization region is set to 1200°C or less, it is possible to suppress the partial melting of the components of the second biomass and the like and to prevent them from adhering to the inner wall of the combustion furnace 10.

[0052] The combustion furnace 10 may also include an oxygen concentration meter 35 for measuring the oxygen concentration in the combustion chamber 12 at a position vertically above the second air supply port 16 and vertically below the exhaust port 19. The oxygen concentration in the carbonization region is measured by the oxygen concentration meter 35, so that the oxygen concentration can be easily controlled. The oxygen concentration in the carbonization region can be about 0% by volume to about 7% by volume. By making the oxygen concentration above 0% by volume, carbides can be easily generated even when there are many volatile components in the second biomass. In addition, by making the oxygen concentration below 7% by volume, the generation of carbon dioxide can be promoted by combustion, and the reduction of the residual amount of carbon can be suppressed.

[0053] The combustion furnace 10 is connected to the carbonization recovery device 40 via the first connecting flow channel 36. The first connecting flow channel 36 is provided with a second biomass supply port 18b for supplying the second biomass into the first connecting flow channel 36. When the second biomass is supplied into the first connecting flow channel 36, carbonization is generated in the first connecting flow channel 36. Specifically, the second biomass is supplied to the carbonization area heated by the combustion of the first biomass and having a low concentration of oxygen lower than that of air due to the combustion of the first biomass via the second biomass supply port 18b. The first connecting flow channel 36 becomes a high-temperature and low-oxygen atmosphere due to the passage of gas in the combustion furnace 10. By supplying the second biomass in such an atmosphere, carbonization can be stably generated from the second biomass, as in the case where the second biomass is supplied into the combustion chamber 12 via the second biomass supply port 18a.

[0054] In addition, in this embodiment, if Figure 2 as well as Figure 3As shown, the second biomass supply port 18b is provided substantially in the center portion when viewed from the central axis direction of the cylindrical portion of the first connecting flow channel 36. The first connecting flow channel 36 includes a first cylindrical pipe 36a connected to the combustion furnace 10 and extending in the vertical direction, and a second cylindrical pipe 36b connected to the carbonization recovery device 40 and extending in the horizontal direction. Figure 3 As shown, when viewed from the direction of the center axis of the second cylindrical tube 36b, the first cylindrical tube 36a and the second cylindrical tube 36b are connected in such a manner that the center axis of the first cylindrical tube 36a and the center axis of the second cylindrical tube 36b are at different positions in the horizontal direction. Figure 2 as well as Figure 3 As shown by the arrow, the first connecting flow channel 36 is configured to allow the gas sent from the combustion furnace 10 to flow in a spiral shape in the second cylindrical tube 36b. In addition, when viewed from the direction of the central axis of the second cylindrical tube 36b, the second biomass supply port 18b is connected to the first connecting flow channel 36 in a manner that is substantially consistent with the central axis of the second cylindrical tube 36b. Therefore, the second biomass is supplied to the center of the gas flowing in a spiral shape and flows in a spiral shape. As a result, the retention distance of the second biomass can be extended.

[0055] However, the position of the second biomass supply port 18b in the first connecting flow channel 36 is not limited to this form. Figure 4 as well as Figure 5 As shown, the second biomass supply port 18b is provided on the side wall of the second cylindrical tube 36b. If the second biomass supply port 18b is provided on the side wall of the second cylindrical tube 36b, the supplied second biomass falls into the second cylindrical tube 36b. That is, since the second biomass is easily accompanied by the internal spiral flow, the biomass with a relatively large particle size is also difficult to fall into the fluidized bed of the combustion furnace 10, so that a stable combustion condition can be maintained in the combustion furnace 10. In addition, since the particle size of the supplied biomass can be increased, the degree of freedom of carbonization can be expanded.

[0056] In addition, the first cylindrical tube 36a extends in the vertical direction, and the second cylindrical tube 36b extends in the horizontal direction, but it is not limited to this mode. Figure 6 as well as Figure 7 As shown, the second cylindrical tube 36b is arranged to be inclined downward in the vertical direction from the connection portion with the first cylindrical tube 36a toward the carbide recovery device 40. In addition, in the present embodiment, the first cylindrical tube 36a and the second cylindrical tube 36b are cylindrical, but they may also be in the shape of an elliptical cylinder, for example. In addition, in the present embodiment, the first cylindrical tube 36a and the second cylindrical tube 36b are connected to form an angular L-shape, but the first connecting flow channel 36 may also have a curved portion, and the first cylindrical tube 36a and the second cylindrical tube 36b may be connected via the curved portion.

[0057] In addition, in the present embodiment, the second biomass supply port 18 includes the second biomass supply port 18a provided in the combustion chamber 12 and the second biomass supply port 18b provided in the first connecting flow channel 36. However, the second biomass supply port 18 may include only one of the second biomass supply port 18a and the second biomass supply port 18b. In other words, the second biomass supply port 18 only needs to include at least one of the second biomass supply port 18a and the second biomass supply port 18b.

[0058] like Figure 1 As shown, the first connecting flow channel 36 may be provided with a third air supply port 37 for supplying air into the first connecting flow channel 36. The temperature in the first connecting flow channel 36 may be lowered due to energy consumption caused by thermal decomposition of the second biomass. In addition, when the second biomass contains a lot of water, the heat energy may be used for gasification of the water, and the temperature in the first connecting flow channel 36 may be lowered. Therefore, by supplying air into the first connecting flow channel 36 from the third air supply port 37 and burning a part of the second biomass in the first connecting flow channel 36, it is possible to suppress the decrease in the temperature in the first connecting flow channel 36. As a result, the temperature in the first connecting flow channel 36 can be maintained at a temperature suitable for carbonization.

[0059] The third air supply port 37 may be provided in the first connecting flow passage 36 closer to the second biomass supply port 18b than the carbonite recovery device 40. This can suppress temperature variation in the first connecting flow passage 36 from the second biomass supply port 18b to the carbonite recovery device 40.

[0060] The air flow passage 21 is connected to the third air supply port 37. The air flow passage 21 is branched between the blower 23 and the flow rate adjustment damper 25. The flow rate adjustment damper 26 and the flow rate adjustment damper 28 are provided in the branched air flow passage 21. In addition, the blower 23 is driven in a state where the flow rate adjustment damper 24, the flow rate adjustment damper 26, and the flow rate adjustment damper 28 are opened, so that air can be continuously supplied from the air inlet 22 to the first connection flow passage 36 via the third air supply port 37.

[0061] The carbide recovery device 40 is connected to the combustion furnace 10 to recover the carbide generated by the second biomass. The carbide recovery device 40 may also be a powder recovery device such as a bag filter, but in the present embodiment, the carbide recovery device 40 includes a cyclone separator. The cyclone separator is a device that uses centrifugal force to separate and capture carbide. Gaseous tar from the pyrolysis of the biomass in the combustion furnace 10 is also supplied to the carbide recovery device 40. The cyclone separator can separate the gas from the carbide without passing through a filter in a high temperature state where the tar is not condensed, so that the carbide with less tar attached can be easily recovered.

[0062] The cyclone separator includes: a supply port 41, which supplies gas in which carbides are dispersed; a main body 42, which centrifugally separates carbides; a dust collecting chamber 43, which collects carbides; and a cylindrical discharge pipe 44, which discharges the gas from which carbides have been removed. The main body 42 has a cylindrical portion 42a arranged at the upper part and a conical portion 42b arranged at the lower side of the cylindrical portion 42a in the vertical direction. The discharge pipe 44 is arranged on the inner side of the cylindrical portion 42a. Carbides fall in the main body 42 and are collected in the dust collecting chamber 43. The gas from which carbides have been removed is discharged from the carbide recovery device 40 through the discharge pipe 44.

[0063] A double windshield 45 formed by connecting two windshields is connected to the dust collecting chamber 43. Each windshield includes a cover 46, and by opening one cover 46 and closing the other cover 46, the carbide can be taken out from the carbide recovery device 40 in a manner that air in the atmosphere does not enter. In addition, a rotary take-out device such as a rotary valve can be used instead of the double windshield 45. In addition, as the take-out device, a water seal device connected to the main body 42 can also be used. The water seal device can also include a water tank for storing water. Since one end of the main body 42 is sealed by the water in the water tank, the carbide separated in the main body 42 contacts the water in the water tank and is cooled. In addition, the above-mentioned take-out device can also be applied to the carbide recovery device 40 other than the cyclone separator.

[0064] The recovered carbide has carbon from the second biomass. The second biomass is carbonized without burning, so that the release of carbon dioxide into the atmosphere can be suppressed. The obtained carbide can be used as a backfill material in the quarrying traces of the quarry, for example. In this case, the same effect as CCS (carbon dioxide recovery and storage) can be obtained. In addition, carbide can also be carbon-isolated from the soil. When carbide is used in agricultural land such as fields, in addition to carbon isolation, it also plays a role as a soil improvement material. The carbide manufacturing system 1 involved in this embodiment can stably control the temperature and oxygen concentration of the carbonization area, so it can also arbitrarily adjust the carbon content in the carbide and the content of nutrients necessary for plants, such as nitrogen, phosphorus and potassium. In addition, since carbide easily absorbs light and heats, it can also be used as a snow-melting agent. In addition, carbide can also be used as a deodorant.

[0065] The carbide manufacturing system 1 may further include a gas utilization device 50 that utilizes the gas discharged from the carbide recovery device 40. In the present embodiment, the gas utilization device 50 includes a boiler. Specifically, the gas utilization device 50 includes a waste heat recovery boiler 51. The waste heat recovery boiler 51 recovers the heat of the gas discharged from the carbide recovery device 40 by heat exchange to generate at least one of steam and hot water. The heat recovered by the waste heat recovery boiler 51 can be used as thermal energy in a factory or the like.

[0066] The gas utilization device 50 is connected to the carbonite recovery device 40 via the second connecting flow channel 52. A fourth air supply port 53 is provided in the second connecting flow channel 52. The air flow channel 21 is connected to the fourth air supply port 53. The air flow channel 21 is branched between the blower 23 and the flow adjustment damper 25. The flow adjustment damper 26 and the flow adjustment damper 29 are provided in the branched air flow channel 21. In addition, the blower 23 is driven in a state where the flow adjustment damper 24, the flow adjustment damper 26, and the flow adjustment damper 29 are opened, so that air can be continuously supplied from the air inlet 22 to the second connecting flow channel 52 via the fourth air supply port 53. Air is supplied into the second connecting flow channel 52, so that the remaining combustible components can be burned.

[0067] The carbide manufacturing system 1 may also include a thermometer 54, which is provided at a position downstream of the fourth air supply port 53 and measures the temperature inside the second connecting flow channel 52. In this way, the temperature of the gas supplied to the gas utilization device 50 can be managed. In addition, the carbide manufacturing system 1 may also include an oxygen concentration meter 55, which is provided at a position downstream of the fourth air supply port 53 and measures the oxygen concentration inside the second connecting flow channel 52. In this way, the oxygen concentration of the gas supplied to the gas utilization device 50 can be managed.

[0068] The ash separation device 56 is connected to the waste heat recovery boiler 51. The ash separation device 56 removes ash from the gas discharged from the waste heat recovery boiler 51. The cyclone separator 57 is connected to the ash separation device 56. The gas from which the ash is separated by the ash separation device 56 is supplied to the cyclone separator 57. Since a trace amount of fine particles may remain in the gas supplied to the cyclone separator 57, the fine particles can be separated by the cyclone separator 57 and then released into the atmosphere.

[0069] The gas discharge port of the cyclone separator 57 is connected to the dust collecting chamber 43 of the carbide recovery device 40 via the cooling gas flow channel 58. The cooling gas flow channel 58 is provided with a flow adjustment damper 59 and a circulating cooling fan 60. In addition, the circulating cooling fan 60 is driven in a state where the flow adjustment damper 59 is opened, so that gas is supplied from the cyclone separator 57 to the carbide recovery device 40. Therefore, the carbide is cooled in the carbide recovery device 40 by the gas that is derived from the gas discharged from the carbide recovery device 40 and cooled by heat exchange in the gas utilization device 50. The carbide just recovered by the carbide recovery device 40 is at a high temperature, and if it comes into contact with the air, it may be burned by the oxygen in the air. However, the oxygen concentration of the gas discharged from the carbide recovery device 40 is low. In addition, the heat of the gas discharged from the carbide recovery device 40 is recovered and cooled by the gas utilization device 50. Therefore, by using such a gas for cooling the recovered carbides, the carbides can be cooled without separately preparing a cooling gas having a low oxygen concentration.

[0070] In addition, instead of using the gas utilization device 50 as in the present embodiment, a cooling device (not shown) may be used to introduce a gas with a low oxygen concentration at a low temperature of 200° C. or less into the carbide recovery device 40. According to such a configuration, it is also possible to suppress the combustion of carbides recovered by the carbide recovery device 40. In addition, when the water seal device as described above is used, the carbides can be cooled by water, so the carbides can be cooled without using a low-temperature gas with a low oxygen concentration.

[0071] As described above, the carbonization system 1 according to the present embodiment includes a combustion furnace 10, which includes a first biomass supply port 17 for supplying a first biomass and a combustion chamber 12 for burning the first biomass with air. The carbonization system 1 includes a carbonization recovery device 40 connected to the combustion furnace 10 and recovering the carbonization generated by the second biomass. The second biomass is supplied to the carbonization area through the second biomass supply port 18, which is heated by the combustion of the first biomass and has a low-concentration oxygen concentration lower than that of air due to the combustion of the first biomass. The second biomass supply port 18 is provided at a position downstream of the first biomass supply port 17.

[0072] In addition, the carbonization method according to the present embodiment includes a step of burning the first biomass supplied to the combustion chamber 12 of the combustion furnace 10 using air. The carbonization method includes a step of supplying the second biomass to a carbonization region located downstream of the first biomass and heated by the combustion of the first biomass and having a low-concentration oxygen concentration lower than that of air due to the combustion of the first biomass. The carbonization method includes a step of recovering the carbonization generated by the second biomass using the carbonization recovery device 40 connected to the combustion furnace 10.

[0073] Therefore, according to the carbide manufacturing system 1 involved in this embodiment, stable carbides can be continuously manufactured from biomass. For example, biomass raw materials such as rice husks have different water concentrations and properties depending on the storage state, but according to the carbide manufacturing system 1 of this embodiment, a stable high-temperature atmosphere can be controlled and maintained.

[0074] [Second Embodiment]

[0075] Next, use Figure 8 A carbide manufacturing system 1 according to the second embodiment will be described. The carbide manufacturing system 1 according to the second embodiment is different from the carbide manufacturing system 1 according to the first embodiment in the form of a gas utilization device 50. The carbide manufacturing system 1 according to the second embodiment is the same as the first embodiment in other aspects, and therefore description thereof will be omitted.

[0076] like Figure 8 As shown, the gas utilization device 50 according to the present embodiment includes a waste heat recovery boiler 70 . In addition, the carbonized material production system 1 includes a turbine 72 , a generator 73 , an air-cooled steam condenser 74 , and a condenser tank 75 .

[0077] The second connection flow channel 52 is connected to the waste heat recovery boiler 70. The waste heat recovery boiler 70 recovers the heat of the gas discharged from the carbide recovery device 40 by heat exchange, and generates water vapor. The water vapor that becomes water vapor and expands in volume passes through the turbine 72 and is used as a power to rotate the turbine 72. The turbine 72 is mechanically connected to the generator 73, and is configured to generate electricity for the generator 73 by the rotation of the turbine 72. The water vapor discharged from the turbine 72 is supplied to the air-cooled steam condenser 74. The water vapor supplied to the air-cooled steam condenser 74 is cooled and condensed, and the condensed water is stored in the condensation tank 75. The water in the condensation tank 75 is supplied to the waste heat recovery boiler 70 by the drive of the pump 76 and circulated.

[0078] The gas outlet of the waste heat recovery boiler 70 is connected to the dust collecting chamber 43 of the carbide recovery device 40 via the cooling gas flow channel 77. In the cooling gas flow channel 77, a bag filter 78, a flow adjustment damper 79, a guide fan 80, a flow adjustment damper 81, and a circulation cooling fan 82 are sequentially arranged from the gas outlet of the waste heat recovery boiler 70 toward the dust collecting chamber 43 of the carbide recovery device 40. The particles in the gas discharged from the waste heat recovery boiler 70 are collected by the bag filter 78. In addition, the guide fan 80 is driven in the state of opening the flow adjustment damper 79, so that a part of the gas after the particles are removed is discharged from the chimney 83 to the atmosphere. In addition, the circulation cooling fan 82 is driven in the state of opening the flow adjustment damper 81, so that a part of the gas after the particles are removed is supplied to the dust collecting chamber 43 of the carbide recovery device 40. Therefore, the carbide is cooled in the carbide recovery device 40 by the gas that is derived from the gas discharged from the carbide recovery device 40 and cooled by heat exchange in the gas utilization device 50.

[0079] According to the carbide production system 1 according to the present embodiment, stable carbides can be continuously produced from biomass, and electric power can also be generated.

[0080] [Third Embodiment]

[0081] Next, use Fig. 9 A carbide manufacturing system 1 according to a third embodiment will be described. The carbide manufacturing system 1 according to the third embodiment is different from the carbide manufacturing system 1 according to the first embodiment in the form of a gas utilization device 50. The carbide manufacturing system 1 according to the third embodiment is the same as the first embodiment in other aspects, and therefore description thereof will be omitted.

[0082] like Fig. 9 As shown in FIG. 1 , the gas utilization device 50 according to the present embodiment includes a coal-fired boiler 90 . In addition, the carbide production system 1 according to the present embodiment includes a cyclone separator 97 .

[0083] The coal-fired boiler 90 is a boiler that uses coal as fuel. Coal is supplied to a combustion chamber 91 of the coal-fired boiler 90 by a coal supply machine 92, and air is supplied to the combustion chamber 91 of the coal-fired boiler 90 by an air supply unit 93. Specifically, the air supply unit 93 includes an air inlet 94, a flow rate adjustment damper 95, and a blower 96. When the flow rate adjustment damper 95 is opened, the blower 96 is driven to supply air from the air inlet 94 to the combustion chamber 91.

[0084] The second connecting flow passage 52 is connected to the coal-fired boiler 90. In this embodiment, unlike the first embodiment, the fourth air supply port 53 is provided in the second connecting flow passage 52 at a position closer to the coal-fired boiler 90 than the carbide recovery device 40. Therefore, the combustible component discharged from the carbide recovery device 40 can be burned in the coal-fired boiler 90. Since the combustion heat can be recovered by heat exchange in the coal-fired boiler 90, the coal used in the coal-fired boiler 90 can be reduced. In addition, a heavy oil boiler or a gas boiler can be used instead of the coal-fired boiler 90. Even in such a case, fossil fuels can be reduced.

[0085] The gas outlet of the coal-fired boiler 90 is connected to the cyclone separator 97. The gas in the combustion chamber 91 is cooled by heat exchange, and the cooled gas passes through the cyclone separator 97. In the cyclone separator 97, particles are collected, and a part of the gas is released from the cyclone separator 97 to the atmosphere.

[0086] The cyclone separator 97 is connected to the dust collecting chamber 43 of the carbide recovery device 40 via a cooling gas flow passage 98. A flow rate adjustment damper 99 and a circulation cooling fan 100 are provided in the cooling gas flow passage 98. In addition, the circulation cooling fan 100 is driven in a state where the flow rate adjustment damper 99 is opened, so that a part of the gas from which the particles are removed is supplied to the dust collecting chamber 43 of the carbide recovery device 40. Therefore, the carbide is cooled in the carbide recovery device 40 by the gas which is derived from the gas discharged from the carbide recovery device 40 and cooled by heat exchange in the gas utilization device 50.

[0087] According to the carbide production system 1 according to the present embodiment, stable carbide can be continuously produced from biomass, and the use of coal required for the coal-fired boiler 90 can also be reduced.

[0088] In the first to third embodiments, one blower 23 is used to supply air to the carbide manufacturing system 1 through a plurality of air supply ports. However, blowers may be arranged upstream of the flow rate regulating damper to supply air to the carbide manufacturing system 1 through each air supply port.

[0089] The entire contents of Japanese Tokugan Application No. 2022-102517 (filing date: June 27, 2022) are incorporated herein by reference.

[0090] Several embodiments have been described, but the embodiments can be modified or altered based on the above disclosure. All the components of the above embodiments and all the features described in the claims can be extracted and combined as long as they do not contradict each other.

[0091] The present disclosure can, for example, contribute to Goal 2 of the Sustainable Development Goals (SDGs) led by the United Nations, namely, "End hunger, achieve food security and improved nutrition, and promote sustainable agriculture", Goal 13, namely, "Take urgent measures to mitigate climate change and its impacts", and Goal 15, namely, "Protect, restore, and promote sustainable use of terrestrial ecosystems, manage sustainable forests, respond to desertification, and prevent and restore land degradation and biodiversity loss".

[0092] Description of Reference Numerals

[0093] 1—carbonized material manufacturing system, 10—combustion furnace, 12—combustion chamber, 17—first biomass supply port, 18—second biomass supply port, 36—first connecting flow channel, 37—third air supply port, 40—carbonized material recovery device, 50—gas utilization device.

Claims

1. A carbide manufacturing system, characterized in that: have: A combustion furnace including a combustion chamber having a first biomass supply port for supplying a first biomass and burning the first biomass using air; a carbonite recovery device connected to the combustion furnace and recovering carbonite generated from the second biomass, The second biomass is supplied through a second biomass supply port located downstream of the first biomass supply port to a carbonization region heated by combustion of the first biomass and containing low-concentration oxygen having an oxygen concentration lower than that of the air due to combustion of the first biomass.

2. The carbide manufacturing system according to claim 1, characterized in that: The combustion furnace is a vertical combustion furnace.

3. The carbide manufacturing system according to claim 1 or 2, characterized in that: The combustion chamber is provided with a second biomass supply port for supplying the second biomass into the combustion chamber. The carbides are generated in the combustion chamber.

4. The carbide production system according to any one of claims 1 to 3, characterized in that: The combustion furnace is connected to the carbide recovery device via a connecting flow channel. The connecting flow channel is provided with a second biomaterial supply port for supplying the second biomaterial into the connecting flow channel. The carbide is generated in the connecting flow channel.

5. The carbide production system according to any one of claims 1 to 4, characterized in that: The combustion furnace is connected to the carbide recovery device via a connecting flow channel. The connecting flow channel is provided with an air supply port for supplying air into the connecting flow channel.

6. The carbide manufacturing system according to any one of claims 1 to 5, characterized in that: The carbide recovery device includes a cyclone separator.

7. The carbide manufacturing system according to any one of claims 1 to 6, characterized in that: A gas utilization device is further provided for utilizing the gas discharged from the carbide recovery device. The carbide is cooled in the carbide recovery device by gas which is derived from the gas exhausted from the carbide recovery device and which has been cooled by heat exchange in the gas utilization device.

8. A method for producing carbide, characterized in that: include: a step of burning the first biomass supplied to the combustion chamber of the combustion furnace using air; The step of supplying a second biomass to a carbonization region of low-concentration oxygen which is located downstream of the first biomass and is heated by combustion of the first biomass and has an oxygen concentration lower than that of the air due to combustion of the first biomass; and A step of recovering carbide generated from the second biomass using a carbide recovery device connected to the combustion furnace.

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