JP6998817B2 - Biomass carbide production system - Google Patents

Description

The present invention is generated in a drying treatment unit that dries water-containing biomass to generate dry biomass, a carbonization treatment unit that carbonizes the dry biomass produced in the drying treatment unit to produce biomass charcoal, and a carbonization treatment unit. The present invention relates to a biomass carbonization production system including a pyrolysis gas incinerator that incinerates the pyrolyzed gas.

Conventionally, there is known a biomass carbide production system for producing biomass carbide by drying and then carbonizing hydrous biomass such as dehydrated sludge (see, for example, Patent Document 1). Such a biomass charcoal production system can reduce greenhouse gas emissions because the incineration of biomass waste can be omitted and the produced biomass charcoal can be used as an alternative fuel for thermal power plants. It is attracting attention as.
Further, in the biomass carbonization production system described in Patent Document 1, a hot air generating unit (sludge incinerator 70) that generates hot air used as a heat source in the drying processing unit and the carbonizing processing unit is provided. The hot air generated by the hot air generating unit is supplied to the carbonization processing unit and the drying processing unit in series. In addition, hydrous biomass and dry biomass are used as fuel to be burned in the hot air generating section.

Japanese Unexamined Patent Publication No. 2005-319374

In the biomass carbonization production system described in Patent Document 1, it is necessary to set the temperature of the hot air generated in the hot air generating section to a relatively high temperature in accordance with the treatment temperature in the carbonization processing section initially supplied. Furthermore, in order to supply sufficient heat to the drying treatment section that is supplied next to the carbonization treatment section, it is necessary to generate a sufficient amount of hot air in the hot air generating section. That is, in the hot air generating part of this biomass carbide production system, it is necessary to generate a relatively large amount of hot air at a relatively high temperature, and the consumption of fuel such as hydrous biomass increases, resulting in deterioration of energy saving. was there.

Further, in this biomass carbonization production system, the hot air generated in the hot air generating section is configured to be supplied to the carbonization treatment section and the drying treatment section in a series state, and after passing through the carbonization treatment section on the front stage side, the rear stage Since the temperature of the hot air supplied to the drying treatment section on the side affects the state of the carbonization treatment section and fluctuates, even if the amount of combustion in the hot air generating section is adjusted, the drying treatment on the subsequent stage side It was difficult to keep the part at an appropriate temperature.

In view of this situation, the main problem of the present invention is to save energy while maintaining the drying treatment section and the carbonization treatment section at an appropriate temperature in the biomass carbonization production system including the drying treatment section, the carbonization treatment section and the pyrolysis gas incinerator section. The point is to provide technology for improving energy efficiency.

The first characteristic configuration of the present invention is a drying treatment unit that dries hydrous biomass to generate dry biomass.
A carbonization treatment unit that carbonizes the dry biomass produced in the drying treatment unit to produce biomass carbide, and a carbonization treatment unit.
A pyrolysis gas incinerator that incinerates the pyrolysis gas generated in the carbonization treatment unit is provided.
A first hot air generating unit that burns fuel to generate hot air and supplies the hot air to one of the drying processing unit and the carbonization processing unit.
A biomass carbonization production system including a second hot air generating unit that burns fuel to generate hot air and supplies the hot air to the other side of the drying processing unit and the carbonization processing unit.
The heat generated in the pyrolysis gas incinerator is supplied to the first hot air generating section, and the heat is supplied to the first hot air generating section.
The second hot air generating unit has a biomass burner that takes out a part of the dried biomass generated in the drying processing unit as solid biomass fuel and burns it.

According to this configuration, hot air is separately supplied to each of the drying treatment section and the carbonization treatment section by the first hot air generating section and the second hot air generating section. Therefore, the drying treatment section and the carbonization treatment section can be maintained at appropriate temperatures by adjusting the amount of combustion in each hot air generating section.
The second hot air generating unit has a biomass burner that takes out a part of the dried biomass generated in the drying processing unit as solid biomass fuel and burns it. Therefore, in this second hot air generating section, it is possible to reduce the amount of fossil fuel to be replenished separately from the solid biomass fuel in order to obtain hot air at a desired temperature.
On the other hand, in the first hot air generation section, the heat generated in the pyrolysis gas incineration section is supplied, so that the fossil that should be replenished separately from the heat generated in the pyrolysis gas incineration section in order to obtain hot air at a desired temperature. Fuel can be reduced.
Therefore, according to the present invention, in a biomass carbonized product production system including a drying treatment unit, a carbonization treatment unit, and a pyrolysis gas incinerator unit, a technique for improving energy saving while maintaining an appropriate temperature for the drying treatment unit and the carbonization treatment unit. Can be provided.

The second characteristic configuration of the present invention is that the first hot air generating unit is a low temperature hot air generating unit that generates low temperature hot air.
The second hot air generating unit is a high temperature hot air generating unit that generates high temperature hot air having a higher temperature than the low temperature hot air.

According to this configuration, the high-temperature hot air generating unit that supplies high-temperature hot air to the high-temperature side processing unit in which the processing temperature of the drying processing unit and the carbonization processing unit is higher than the other is generated in the drying processing unit. It has a biomass burner that takes out a part of the dried biomass as solid biomass fuel and burns it. Therefore, in this high-temperature hot air generating section, the dry biomass can be burned at a sufficiently high combustion temperature, so that the generation of dioxin caused by the combustion of the dry biomass can be suppressed, and the high-temperature hot air at a desired temperature can be generated. It is possible to reduce the amount of fossil fuel to be replenished separately from the solid biomass fuel in order to obtain it.

On the other hand, in the low-temperature hot air generating section that supplies the low-temperature hot air to the low-temperature side processing section in which the treatment temperature of the drying treatment section and the carbonization treatment section is lower than that of the other, the low-temperature hot air is lower than the high-temperature hot air. Therefore, by supplying the heat generated in the thermal decomposition gas incineration section, the amount of fossil fuel that must be replenished separately from the heat generated in the thermal decomposition gas incineration section in order to obtain low-temperature hot air at a desired temperature is reduced. be able to.

The third characteristic configuration of the present invention is that the first hot air generating section is the pyrolysis gas incinerator section.

According to this configuration, the first hot air generating section and the pyrolysis gas incinerator section can be configured by a single incinerator or the like. That is, the first hot air generation unit also functions as a pyrolysis gas incinerator unit that incinerates the pyrolysis gas generated in the carbonization treatment unit. As a result, in the first hot air generating section, the pyrolysis gas generated in the carbonization treatment section is incinerated, so that the relatively high temperature exhaust gas generated by the incineration is used as it is as hot air without lowering the temperature and dried. It will be supplied to the processing unit or the carbonization processing unit. Therefore, it is possible to further reduce the amount of fossil fuel to be replenished in order to obtain hot air at a desired temperature in the first hot air generating unit.

The fourth characteristic configuration of the present invention includes an air preheating unit that preheats the combustion air supplied to the first hot air generating unit and the second hot air generating unit by heat exchange with the exhaust gas discharged to the outside. It is at the point.

According to this configuration, part or all of the exhaust gas generated in the heat decomposition gas incineration section, the exhaust gas generated in the drying treatment section and the carbonization treatment section, the hot air, etc. are discharged to the outside such as the atmosphere as exhaust gas. The heat possessed by the exhaust gas discharged to the outside can be recovered by using it for preheating the combustion air supplied to the first hot air generating part and the second hot air generating part by the air preheating part. , Energy saving can be further improved.

The fifth characteristic configuration of the present invention is a fossil fuel burner for burning fossil fuel and a combustion amount adjustment in which the amount of combustion by the fossil fuel burner can be adjusted by each of the first hot air generating unit and the second hot air generating unit. The point is that it has means.

According to this configuration, since the fossil fuel burner whose combustion amount can be adjusted by the combustion amount adjusting means is provided in the first hot air generating part and the second hot air generating part, the fossil fuel in the fossil fuel burner can be used. By adjusting the combustion amount of the fossil fuel burner while keeping the combustion amount to a minimum, hot air at a desired temperature can be secured.

Schematic block diagram of the biomass carbide production system of the first embodiment Schematic block diagram of the biomass carbide production system of the second embodiment Schematic block diagram of the biomass carbide production system of the third embodiment Schematic block diagram of the biomass carbide production system of the fourth embodiment Schematic block diagram of the biomass carbide production system of the fifth embodiment Schematic block diagram of the biomass carbide production system of the sixth embodiment The figure which shows the detailed structure of a distribution part

An embodiment of the biomass carbide production system according to the present invention will be described with reference to the drawings. It should be noted that FIGS. 1 to 6 show a schematic configuration of the biomass carbide production system in each of the first to sixth embodiments.

[Common configuration]
First, a common detailed configuration in the biomass carbide production system (hereinafter, may be referred to as “this system”) of each embodiment shown in FIGS. 1 to 6 will be described below.
In this system, a drying treatment unit 1 that dries water-containing biomass X1 appropriately dehydrated by a dehydrator or the like to generate dry biomass X2, and a dry biomass X2 supplied from the drying treatment unit 1 are carbonized to form biomass carbonized product X3. A carbonization treatment unit 2 for generating the above-mentioned material and a pyrolysis gas incineration unit 5 for incinerating the pyrolysis gas G2 generated in the carbonization treatment unit 2 are provided.

Further, in this system, a low temperature hot air generating unit 4 (an example of a first hot air generating unit) that burns fuel to generate a low temperature hot air G4 (an example of hot air) and a high temperature hot air G3 (an example of a hot air) that burns fuel to generate a high temperature hot air G3 (an example of hot air) are provided. A high-temperature hot air generating unit 3 (an example of a second hot air generating unit) for generating (one example) is provided. Further, in this system, an air preheating unit 8 that preheats the combustion air A supplied by the blower 9 by heat exchange with exhaust gas discharged to the atmosphere or the like (an external example), and heat recovery for recovering heat. Various facilities such as a heat exchange unit 7 and a control device 50 for controlling operation are provided.
Hereinafter, detailed configurations of the equipment provided in this system will be described in order.

(Drying processing unit)
The drying treatment unit 1 is composed of, for example, a known hot air dryer or the like, and a hydrous biomass X1 dehydrated by an appropriate dehydrator (not shown) is charged and supplied while stirring the charged hydrobiomass X1. It is configured to be dried by directly contacting with hot air of about 750 ° C to 850 ° C. Therefore, the dried biomass X2 after drying is discharged from the drying treatment unit 1, and the exhaust gas G1 having a temperature of about 150 ° C. to 250 ° C. including the water released from the hydrous biomass X1 is discharged.
The dried biomass X2 discharged from the drying processing unit 1 is appropriately granulated and then supplied to the carbonization processing unit 2 described later.

(Carbonization section)
The carbonization treatment unit 2 is composed of, for example, a known indirect heating type rotary kiln or the like, and the dried biomass X2 after drying supplied from the drying treatment unit 1 is charged, and the charged dry biomass X2 is low while stirring. It is configured to be indirectly heated and carbonized in an oxygen atmosphere. Therefore, the carbonized biomass X3 after carbonization is discharged from the carbonization treatment unit 2, and the pyrolysis gas G2 containing the flammable gas generated during the thermal decomposition of the dry biomass X2 is discharged.
The biomass carbide X3 discharged from the carbonization treatment unit 2 is, for example, cooled by a cooling conveyor and then discharged as a product.
On the other hand, the pyrolysis gas G2 discharged from the carbonization treatment unit 2 is supplied to the pyrolysis gas incinerator unit 5, which will be described later.

The carbonization treatment unit 2 is provided with a heater 2a for indirectly heating the dry biomass X2 by heat exchange with hot air passing through the inside. Then, the hot air supplied to the heater 2a of the carbonization treatment unit 2 passes through the heater 2a and the temperature drops, and then is discharged from the heater 2a as exhaust gas G2a.

Although the details of the carbonization treatment unit 2 will be described later, hot air having a relatively high temperature of about 800 ° C. to 1000 ° C. is supplied to the heater 2a to perform carbonization treatment within a medium temperature to high temperature treatment temperature range. What is to be done (see FIGS. 2, 3 and 4) and what is carbonized within the low temperature processing temperature range by supplying hot air at a relatively low temperature of about 500 ° C to 700 ° C to the heater 2a (see FIG. 2, Fig. 3 and Fig. 4). (See FIGS. 1, 5, and 6).

(Pyrolysis gas incinerator)
The pyrolysis gas incinerator 5 is composed of, for example, a known gas combustion furnace or the like, and the pyrolysis gas G2 supplied from the carbonization treatment unit 2 is completely burned while being mixed and stirred with the combustion air A in a high temperature environment. It is configured to be incinerated. Therefore, in the pyrolysis gas incineration unit 5, exhaust gas G5 having a temperature of about 800 ° C. to 900 ° C. including the exhaust gas of the pyrolysis gas G2 is generated.

(Low temperature hot air generator)
The low-temperature hot air generating unit 4 is composed of, for example, a known hot air generating furnace or the like, and is configured to generate combustion exhaust gas generated by burning fuel as low-temperature hot air G4. Further, the heat generated by the pyrolysis gas incinerator unit 5 is supplied to the low temperature hot air generating unit 4.
That is, in the low temperature hot air generation unit 4, the heat generated by the pyrolysis gas incineration unit 5 is added to the combustion exhaust gas generated by the fossil fuel burner Bf, and the low temperature hot air G4 is generated.
Therefore, in this low-temperature hot air generation unit 4, relatively high-temperature heat is supplied from the pyrolysis gas incineration unit 5 to generate low-temperature hot air G4, and fossils to be replenished in order to obtain low-temperature hot air G4 at a desired temperature. Fuel F is reduced.

The low-temperature hot air generating unit 4 has a combustion amount adjusting valve 15 (an example of a combustion amount adjusting means) capable of adjusting the combustion amount by the fossil fuel burner Bf in a form of adjusting the supply amount of the fossil fuel F to the fossil fuel burner Bf. ) Is provided. The control device 50 is generated in the low-temperature hot air generating unit 4 by adjusting the combustion amount by the fossil fuel burner Bf by controlling the operation of the combustion amount adjusting valve 15 while checking, for example, the temperature inside the furnace and the temperature of the generated low-temperature hot air G4. The temperature of the low temperature hot air G4 can be maintained at a desired temperature.
The low-temperature hot air G4 generated by the low-temperature hot air generating unit 4 is supplied to the low-temperature side processing unit LP on the lower processing temperature side of the drying processing unit 1 and the carbonization processing unit 2.

(High temperature hot air generator)
The high-temperature hot air generating unit 3 is composed of, for example, a known hot air generating furnace or the like, and is configured to generate combustion exhaust gas generated by burning fuel as high-temperature hot air G3 having a higher temperature than the low-temperature hot air G4. There is.
The high-temperature hot air generating unit 3 is provided with a fossil fuel burner Bf that burns fossil fuel F and a biomass burner Bv that burns a part of dry biomass X2 taken out from the distribution unit 20 as solid biomass fuel.
That is, in the high temperature hot air generation unit 3, a mixed gas of the combustion exhaust gas generated by the fossil fuel burner Bf and the combustion exhaust gas generated by the biomass burner Bv is generated as the high temperature hot air G3.
Therefore, in the high temperature hot air generating unit 3, the dry biomass X2 can be burned at a sufficiently high combustion temperature, so that the production of dioxin caused by the combustion of the dry biomass X2 is suppressed, and moreover, it is desired. The fossil fuel F to be replenished in order to obtain the high temperature hot air G3 is reduced.

The high temperature hot air generating unit 3 has a combustion amount adjusting valve 15 (an example of a combustion amount adjusting means) capable of adjusting the combustion amount by the fossil fuel burner Bf in a form of adjusting the supply amount of the fossil fuel F to the fossil fuel burner Bf. ) Is provided. The control device 50 is generated by the high-temperature hot air generator 3 by adjusting the amount of combustion by the fossil fuel burner Bf by controlling the operation of the combustion amount adjusting valve 15 while checking, for example, the temperature inside the furnace and the temperature of the generated high-temperature hot air G3. The temperature of the hot air G3 can be maintained at a desired temperature.
The high-temperature hot air G3 generated by the high-temperature hot air generating unit 3 is supplied to the high-temperature side processing unit HP on the side of the drying processing unit 1 and the carbonization processing unit 2 where the processing temperature is high.

(Air preheating section)
The air preheating unit 8 has a low temperature hot air generating unit 4, a high temperature hot air generating unit 3, and a thermal decomposition gas incineration unit by exchanging heat with a relatively high temperature exhaust gas discharged to the atmosphere or the like through an exhaust gas treating unit 10 and a chimney 12. It is configured as a gas-gas type heat exchanger that preheats the combustion air A supplied to 5.
That is, at least a part of the heat possessed by the exhaust gas discharged to the atmosphere or the like is used for preheating the combustion air A supplied to the low temperature hot air generating unit 4 and the high temperature hot air generating unit 3 by the air preheating unit 8. It will be recovered, and further improvement of energy saving is aimed at.

(Heat exchange unit for heat recovery)
In addition to the air preheating section 8, a heat recovery section 7 for recovering heat from exhaust gas discharged to the atmosphere or the like is provided. The heat recovery heat exchange unit 7 heats the exhaust gas supplied to the high temperature hot air generation unit 3 or the low temperature hot air generation unit 4 by heat exchange with the exhaust gas discharged to the atmosphere or the like through the exhaust gas treatment unit 10 and the chimney 12 and the like. It is configured as a gas-gas type heat exchanger.
That is, at least a part of the heat possessed by the exhaust gas discharged to the atmosphere or the like is recovered for heating the exhaust gas supplied to the high temperature hot air generating unit 3 or the low temperature hot air generating unit 4, and the high temperature hot air G3 or the low temperature hot air G4 is recovered. The energy saving is further improved.

(Distribution section)
The distribution unit 20 that takes out a part of the dry biomass X2 generated by the drying processing unit 1 and supplies it to the biomass burner Bv can be configured as shown in FIG. 7.
That is, the distribution unit 20 is provided with a distribution unit buffer tank 21, a combustion unit buffer tank 22, and a carbonization processing unit buffer tank 23. That is, in the carbonization treatment unit 2, the supply amount of the dry biomass X2 is maintained at the set supply amount, so that the dry biomass X2 is carbonized under stable treatment conditions, and the quality of the dry biomass X3 is stable and high quality biomass carbide X3. Is generated.

The distribution unit buffer tank 21 is configured to temporarily store the dry biomass X2 in the distribution unit 20 that distributes the dry biomass X2 generated in the drying processing unit 1 to the biomass burner Bv side and the carbonization processing unit 2 side. Has been done.
The buffer tank 22 for the combustion unit is configured to temporarily store the dry biomass X2 in the path leading from the distribution unit 20 to the biomass burner Bv.
The buffer tank 23 for the carbonization treatment unit is configured to temporarily store the dry biomass X2 in the route leading from the distribution unit 20 to the carbonization treatment unit 2.

In the present embodiment, the distribution unit 20 is provided with three buffer tanks 21, 22 and 23: a distribution unit buffer tank 21, a combustion unit buffer tank 22, and a carbonization processing unit buffer tank 23. However, only the distribution unit buffer tank 21 may be provided, or one of the combustion unit buffer tank 22 and the carbonization processing unit buffer tank 23 may be omitted. That is, by providing at least the distribution unit buffer tank 21 as the dry biomass storage means, it is possible to stabilize the processing conditions of the carbonization processing unit 2 and generate high-quality biomass carbide X3.

Each buffer tank 21, 22, 23 is provided with feeders 21a, 21b, 22a, 23a for discharging the stored dried biomass X2 to a supply destination. Further, these feeders 21a, 21b, 22a, 23a are controlled by the control device 50 (see FIGS. 1 to 6) so that the amount of dried biomass X2 discharged from each of the buffer tanks 21, 22, and 23 can be adjusted. ing.

That is, the dried biomass X2 generated in the drying processing unit 1 is temporarily stored in the distribution unit buffer tank 21. Then, the dried biomass X2 discharged from the distribution unit buffer tank 21 by the feeder 21a is temporarily stored in the combustion unit buffer tank 22, and the stored dried biomass X2 is discharged by the feeder 22a to be solid biomass. It will be supplied to the biomass burner Bv as fuel.

On the other hand, the dried biomass X2 discharged from the distribution unit buffer tank 21 by the feeder 21b is temporarily stored in the buffer tank 23 for the carbonization processing unit, and the stored dried biomass X2 is discharged by the feeder 23a and carbonized. It will be supplied to the carbonization treatment unit 2 as a treatment target.

[First Embodiment]
Next, the detailed configuration of the system of the first embodiment shown in FIG. 1 will be described.
The high-temperature hot air generating unit 3 is configured to generate high-temperature hot air G3 having a temperature of about 750 ° C to 850 ° C. On the other hand, the low temperature hot air generating unit 4 is configured to generate a low temperature hot air G4 having a temperature of about 500 ° C. to 700 ° C., which is lower than that of the high temperature hot air G3. The drying processing unit 1 is configured as a high temperature side processing unit HP to which the high temperature hot air G3 generated by the high temperature hot air generating unit 3 is supplied. On the other hand, the carbonization treatment unit 2 is configured as a low temperature side treatment unit LP in which the low temperature hot air G4 generated by the low temperature hot air generation unit 4 is supplied to the heater 2a.

Since the exhaust gas G1 discharged from the drying treatment unit 1 contains biomass dust and odorous gas, the exhaust gas G1 is returned to the high-temperature hot air generating unit 3 to incinerate the dust and odorous gas contained therein.
On the other hand, the low temperature hot air G4 after passing through the heater 2a of the carbonization treatment unit 2 is discharged from the heater 2a as exhaust gas G2a in a state where the temperature is lowered to about 200 ° C. to 400 ° C. The exhaust gas G2a discharged from the heater 2a is mainly returned to the low-temperature hot air generating section 4, but some of the exhaust gas G2a is supplied to the chimney 12 and used as a diluting exhaust gas for preventing white smoke, and then the atmosphere. Etc. are discharged.

A pyrolysis gas incinerator unit 5 is provided separately from the high-temperature hot air generating unit 3 and the low-temperature hot air generating unit 4. The combustion air A preheated by the air preheating unit 8 is distributed and supplied to the high temperature hot air generating unit 3, the low temperature hot air generating unit 4, and the pyrolysis gas incinerator unit 5.

A part of the exhaust gas G5 discharged from the pyrolysis gas incinerator unit 5 is taken out and supplied to the low temperature hot air generating unit 4. As a result, the heat generated in the pyrolysis gas incinerator unit 5 is supplied to the low temperature hot air generation unit 4.
On the other hand, the balance of the exhaust gas G5 discharged from the pyrolysis gas incinerator 5 that is not supplied to the low-temperature hot air generating section 4 is discharged to the atmosphere or the like through the exhaust gas treating section 10 and the chimney 12.

Further, a part of the high temperature hot air G3 generated by the high temperature hot air generation unit 3 is taken out and discharged to the atmosphere or the like through the exhaust gas treatment unit 10 and the chimney 12 in the same manner as the exhaust gas G5.
Specifically, a part of the exhaust gas G5 discharged from the pyrolysis gas incineration unit 5 and a part of the high temperature hot air G3 generated by the high temperature hot air generating unit 3 are mixed, and the mixed gas is discharged to the atmosphere as the exhaust gas G20. Will be done.

A heat recovery unit 7 and an air preheating unit 8 are arranged in series in order along the flow direction of the exhaust gas G20.
Then, in the heat recovery unit 7 on the front stage side, the exhaust gas G1 returned to the high temperature hot air generating unit 3 is heated by heat exchange with the relatively high temperature exhaust gas G20. In the air preheating section 8 on the rear stage side, the combustion air A is preheated by heat exchange with the exhaust gas G20 which has passed through the heat recovery heat exchange section 7 and whose temperature has dropped slightly.

In the present embodiment, a part of the high temperature hot air G3 generated by the high temperature hot air generating unit 3 is taken out and discharged to the atmosphere as exhaust gas G20, but as shown by the alternate long and short dash line in FIG. 1, the drying treatment is performed. It is also possible to take out a part of the exhaust gas G1 discharged from the part 1 and discharge it to the atmosphere or the like. In this case, the exhaust gas G1 taken out is supplied to the pyrolysis gas incineration unit 5, so that the dust and odorous gas contained in the exhaust gas G1 are incinerated.

[Second Embodiment]
Next, the detailed configuration of the system of the second embodiment shown in FIG. 2 will be described.
The high-temperature hot air generating unit 3 is configured to generate high-temperature hot air G3 at about 800 ° C. to 1000 ° C. On the other hand, the low temperature hot air generating unit 4 is configured to generate a low temperature hot air G4 having a temperature of about 750 ° C. to 850 ° C., which is lower than that of the high temperature hot air G3. The drying processing unit 1 is configured as a low temperature side processing unit LP to which the low temperature hot air G4 generated by the low temperature hot air generating unit 4 is supplied. On the other hand, the carbonization treatment unit 2 is configured as a high temperature side treatment unit HP in which the high temperature hot air G3 generated by the high temperature hot air generation unit 3 is supplied to the heater 2a.

Since the exhaust gas G1 discharged from the drying treatment unit 1 contains biomass dust and odorous gas, the exhaust gas G1 is returned to the low temperature hot air generating unit 4 to incinerate the dust and odorous gas contained therein.
On the other hand, the high temperature hot air G3 after passing through the heater 2a of the carbonization treatment unit 2 is discharged from the heater 2a as exhaust gas G2a in a state where the temperature is lowered to about 500 ° C. to 700 ° C., and at least a part thereof is returned to the high temperature hot air generation unit 3. Is done.

A pyrolysis gas incinerator unit 5 is provided separately from the high-temperature hot air generating unit 3 and the low-temperature hot air generating unit 4. The combustion air A preheated by the air preheating unit 8 is distributed and supplied to the high temperature hot air generating unit 3, the low temperature hot air generating unit 4, and the pyrolysis gas incinerator unit 5.

The entire amount of the exhaust gas G5 discharged from the pyrolysis gas incinerator unit 5 is supplied to the low temperature hot air generating unit 4. As a result, the heat generated in the pyrolysis gas incinerator unit 5 is supplied to the low temperature hot air generation unit 4.
A part of the exhaust gas G2a discharged from the heater 2a of the carbonization treatment section 2 is taken out and returned to the high temperature hot air generating section 3, but the rest is discharged to the atmosphere or the like through the exhaust gas treatment section 10 and the chimney 12.
Further, a part of the low temperature hot air G4 generated by the low temperature hot air generation unit 4 is taken out and discharged to the atmosphere or the like through the exhaust gas treatment unit 10 and the chimney 12.

In the heat recovery unit 7, the exhaust gas G1 returned to the low temperature hot air generating unit 4 is heated by heat exchange with the relatively high temperature low temperature hot air G4 discharged from the low temperature hot air generating unit 4 to the atmosphere or the like.
On the other hand, in the air preheating section 8, the combustion air A is preheated by heat exchange with the relatively high temperature exhaust gas G2a discharged from the heater 2a of the carbonization treatment section 2 to the atmosphere or the like.

[Third Embodiment]
Next, the detailed configuration of the system of the third embodiment shown in FIG. 3 will be described.
The high-temperature hot air generating unit 3 is configured to generate high-temperature hot air G3 at about 800 ° C. to 1000 ° C. On the other hand, the low temperature hot air generating unit 4 is configured to generate a low temperature hot air G4 having a temperature of about 750 ° C. to 850 ° C., which is lower than that of the high temperature hot air G3. The drying processing unit 1 is configured as a low temperature side processing unit LP to which the low temperature hot air G4 generated by the low temperature hot air generating unit 4 is supplied. On the other hand, the carbonization treatment unit 2 is configured as a high temperature side treatment unit HP in which the high temperature hot air G3 generated by the high temperature hot air generation unit 3 is supplied to the heater 2a.

Since the exhaust gas G1 discharged from the drying treatment unit 1 contains biomass dust and odorous gas, the exhaust gas G1 is returned to the low temperature hot air generating unit 4 to incinerate the dust and odorous gas contained therein.
On the other hand, the high temperature hot air G3 after passing through the heater 2a of the carbonization treatment unit 2 is discharged from the heater 2a as exhaust gas G2a in a state where the temperature is lowered to about 500 ° C. to 700 ° C., and at least a part thereof is returned to the high temperature hot air generation unit 3. Is done.

A pyrolysis gas incinerator unit 5 is provided separately from the high-temperature hot air generating unit 3 and the low-temperature hot air generating unit 4. A part of the combustion air A preheated by the air preheating unit 8 is distributed and supplied to the high temperature hot air generating unit 3 and the pyrolysis gas incinerator unit 5. On the other hand, the rest of the combustion air A preheated by the air preheating unit 8 is heated to a higher temperature by the heat recovery heat exchange unit 7 and then supplied to the low temperature hot air generating unit 4.

A part of the exhaust gas G5 discharged from the pyrolysis gas incinerator unit 5 is taken out and supplied to the low temperature hot air generating unit 4. As a result, the heat generated in the pyrolysis gas incinerator unit 5 is supplied to the low temperature hot air generation unit 4.
On the other hand, of the exhaust gas G5 discharged from the pyrolysis gas incinerator section 5, the balance that is not supplied to the low temperature hot air generating section 4 is discharged to the atmosphere or the like through the exhaust gas treatment section 10 and the chimney 12.
A part of the exhaust gas G2a discharged from the heater 2a of the carbonization treatment section 2 is taken out and returned to the high temperature hot air generating section 3, but the rest is discharged to the atmosphere or the like through the exhaust gas treatment section 10 and the chimney 12.

In the heat recovery unit 7, the combustion air A supplied to the low temperature hot air generation unit 4 is preheated by heat exchange with the relatively high temperature exhaust gas G5 discharged from the pyrolysis gas incineration unit 5 to the atmosphere or the like. To. As a result, the heat generated in the pyrolysis gas incinerator unit 5 is supplied to the low temperature hot air generation unit 4.
On the other hand, in the air preheating section 8, heat is exchanged with the relatively high temperature exhaust gas G2a discharged from the heater 2a of the carbonization treatment section 2 to the atmosphere or the like, and the hot air is distributed and supplied to the high temperature hot air generating section 3 and the pyrolysis gas incineration section 5. The combustion air A to be generated is preheated.

A part of the exhaust gas G1 discharged from the drying treatment unit 1 is supplied to the low temperature hot air generating unit 4, but the remaining portion is taken out and discharged to the atmosphere or the like. In this case, the exhaust gas G1 taken out is supplied to the pyrolysis gas incineration unit 5, so that the dust and odorous gas contained in the exhaust gas G1 are incinerated. Instead of discharging a part of the exhaust gas G1 discharged from the drying treatment unit 1 to the atmosphere or the like, a part of the low temperature hot air G4 generated by the low temperature hot air generating unit 4 may be discharged to the atmosphere or the like. In this case, since the low-temperature hot air G4 discharged to the atmosphere or the like is incinerated with odorous gas or the like in the low-temperature hot air generating unit 4, the exhaust gas is appropriately treated as it is without being supplied to the pyrolysis gas incinerator unit 5. It may be discharged to the atmosphere or the like.

[Fourth Embodiment]
Next, the detailed configuration of the system of the fourth embodiment shown in FIG. 4 will be described.
The high-temperature hot air generating unit 3 is configured to generate high-temperature hot air G3 at about 800 ° C. to 1000 ° C. On the other hand, the low temperature hot air generating unit 4 is configured to generate a low temperature hot air G4 having a temperature of about 750 ° C. to 850 ° C., which is lower than that of the high temperature hot air G3. The drying processing unit 1 is configured as a low temperature side processing unit LP to which the low temperature hot air G4 generated by the low temperature hot air generating unit 4 is supplied. On the other hand, the carbonization treatment unit 2 is configured as a high temperature side treatment unit HP in which the high temperature hot air G3 generated by the high temperature hot air generation unit 3 is supplied to the heater 2a.

Since the exhaust gas G1 discharged from the drying treatment unit 1 contains biomass dust and odorous gas, the exhaust gas G1 is returned to the low temperature hot air generating unit 4 to incinerate the dust and odorous gas contained therein.
On the other hand, the high temperature hot air G3 after passing through the heater 2a of the carbonization treatment unit 2 is discharged from the heater 2a as exhaust gas G2a in a state where the temperature is lowered to about 500 ° C. to 700 ° C., and at least a part thereof is returned to the high temperature hot air generation unit 3. Is done.

A pyrolysis gas incinerator unit 5 is provided separately from the high-temperature hot air generating unit 3 and the low-temperature hot air generating unit 4. The combustion air A preheated by the air preheating unit 8 is distributed and supplied to the high temperature hot air generating unit 3, the low temperature hot air generating unit 4, and the pyrolysis gas incinerator unit 5.

The entire amount of the exhaust gas G5 discharged from the pyrolysis gas incinerator unit 5 is discharged to the atmosphere or the like through the exhaust gas treatment unit 10 and the chimney 12.
A part of the exhaust gas G2a discharged from the heater 2a of the carbonization treatment section 2 is taken out and returned to the high temperature hot air generating section 3, but the rest is discharged to the atmosphere or the like through the exhaust gas treatment section 10 and the chimney 12.

In the heat recovery unit 7, the exhaust gas G1 returned to the low temperature hot air generating unit 4 is heated by heat exchange with the relatively high temperature exhaust gas G5 discharged from the pyrolysis gas incineration unit 5 to the atmosphere or the like. As a result, the heat generated in the pyrolysis gas incinerator unit 5 is supplied to the low temperature hot air generation unit 4.
On the other hand, in the air preheating section 8, the combustion air A is preheated by heat exchange with the relatively high temperature exhaust gas G2a discharged from the heater 2a of the carbonization treatment section 2 to the atmosphere or the like.

A part of the exhaust gas G1 discharged from the drying treatment unit 1 is supplied to the low temperature hot air generating unit 4, but the remaining portion is taken out and discharged to the atmosphere or the like. In this case, the exhaust gas G1 taken out is supplied to the pyrolysis gas incineration unit 5, so that the dust and odorous gas contained in the exhaust gas G1 are incinerated. Instead of discharging a part of the exhaust gas G1 discharged from the drying treatment unit 1 to the atmosphere or the like, a part of the low temperature hot air G4 generated by the low temperature hot air generating unit 4 may be discharged to the atmosphere or the like. In this case, since the low-temperature hot air G4 discharged to the atmosphere or the like is incinerated with odorous gas or the like in the low-temperature hot air generating unit 4, the exhaust gas is appropriately treated as it is without being supplied to the pyrolysis gas incinerator unit 5. It may be discharged to the atmosphere or the like.

[Fifth Embodiment]
Next, the detailed configuration of the system of the fifth embodiment shown in FIG. 5 will be described.
The system is provided with a low-temperature hot air generating unit 11 that functions as a low-temperature hot air generating unit 4 that generates low-temperature hot air G4 and also functions as a pyrolysis gas incinerator unit 5.
That is, the low-temperature hot air generating unit 11 functions as the low-temperature hot air generating unit 4 that generates the low-temperature hot air G4 at about 500 ° C. to 700 ° C. Further, the low-temperature hot air generation unit 11 also functions as a pyrolysis gas incineration unit 5 that completely burns and incinerates the pyrolysis gas G2 supplied from the carbonization treatment unit 2 while mixing and stirring with the combustion air A in a high temperature environment. do. That is, in such a low-temperature hot air generation unit 11, the heat generated by incinerating the pyrolysis gas G2 is used for heating the low-temperature hot air G4, and the heat generated by the pyrolysis gas incineration unit 5 is the low-temperature hot air. It is supplied to the generation unit 4.
Further, in such a low temperature hot air generating unit 11, a relatively high temperature exhaust gas G11 of about 850 ° C. is generated, and a part of the exhaust gas G11 is mixed with the relatively low temperature exhaust gas G2a discharged from the heater 2a to have a low temperature of an appropriate temperature. It becomes hot air G4, and the remaining exhaust gas G11 is discharged to the atmosphere or the like.
In the present embodiment, the low-temperature hot air generating unit 11 is configured to mix the relatively high-temperature exhaust gas G11 with the relatively low-temperature exhaust gas G2a to generate the low-temperature hot air G4 supplied to the heater 2a. However, when the exhaust gas G11 has a relatively low temperature, the exhaust gas G11 may be configured to be supplied to the heater 2a as a low temperature hot air G4 without mixing the exhaust gas G2a.

The high-temperature hot air generating unit 3 is configured to generate a high-temperature hot air G3 having a temperature of about 750 ° C. to 850 ° C., which is higher than that of the low-temperature hot air G4. The drying processing unit 1 is configured as a high temperature side processing unit HP to which the high temperature hot air G3 generated by the high temperature hot air generating unit 3 is supplied. On the other hand, the carbonization treatment unit 2 is configured as a low temperature side treatment unit LP in which the low temperature hot air G4 generated by the low temperature hot air generation unit 11 is supplied to the heater 2a.

Since the exhaust gas G1 discharged from the drying treatment unit 1 contains biomass dust and odorous gas, the exhaust gas G1 is returned to the high-temperature hot air generating unit 3 to incinerate the dust and odorous gas contained therein.
On the other hand, the low temperature hot air G4 after passing through the heater 2a of the carbonization treatment unit 2 is discharged from the heater 2a as exhaust gas G2a in a state where the temperature is lowered to about 200 ° C. to 400 ° C. The exhaust gas G2a discharged from the heater 2a is mainly returned to the low-temperature hot air generating section 11, but some of the exhaust gas G2a is supplied to the chimney 12 and used as a diluting exhaust gas for preventing white smoke, and then the atmosphere. Etc. are discharged.

The combustion air A preheated by the air preheating unit 8 is distributed and supplied to the high temperature hot air generating unit 3 and the low temperature hot air generating unit 11.

The entire amount of the exhaust gas G11 discharged from the low-temperature hot air generating section 11 is discharged to the atmosphere through the exhaust gas treating section 10, the chimney 12, and the like.
Further, a part of the high temperature hot air G3 generated by the high temperature hot air generation unit 3 is taken out and discharged to the atmosphere or the like through the exhaust gas treatment unit 10 and the chimney 12 in the same manner as the exhaust gas G11.
Specifically, the exhaust gas G11 discharged from the low-temperature hot air generating unit 11 and a part of the high-temperature hot air G3 generated by the high-temperature hot air generating unit 3 are mixed, and the mixed gas is discharged to the atmosphere as the exhaust gas G20.

A heat recovery unit 7 and an air preheating unit 8 are arranged in series in order along the flow direction of the exhaust gas G20.
Then, in the heat recovery unit 7 on the front stage side, the exhaust gas G1 returned to the high temperature hot air generating unit 3 is heated by heat exchange with the relatively high temperature exhaust gas G20. In the air preheating section 8 on the subsequent stage side, the combustion air A is preheated by heat exchange with the exhaust gas G20 which has passed through the heat recovery heat exchange section 7 and whose temperature has dropped slightly.

In the present embodiment, a part of the high temperature hot air G3 generated by the high temperature hot air generating unit 3 is taken out and discharged to the atmosphere as exhaust gas G20, but as shown by the alternate long and short dash line in FIG. 5, the drying treatment is performed. It is also possible to take out a part of the exhaust gas G1 discharged from the part 1 and discharge it to the atmosphere or the like. In this case, the exhaust gas G1 taken out is supplied to the low-temperature hot air generating unit 11 to incinerate the dust and odorous gas contained in the exhaust gas G1.

[Sixth Embodiment]
Next, the detailed configuration of the system of the sixth embodiment shown in FIG. 6 will be described.
The system is provided with a low-temperature hot air generating unit 11 that functions as a low-temperature hot air generating unit 4 that generates low-temperature hot air G4 and also functions as a pyrolysis gas incinerator unit 5.
That is, the low-temperature hot air generating unit 11 functions as the low-temperature hot air generating unit 4 that generates the low-temperature hot air G4 at about 750 ° C. to 850 ° C. Further, the low-temperature hot air generation unit 11 also functions as a pyrolysis gas incineration unit 5 that completely burns and incinerates the pyrolysis gas G2 supplied from the carbonization treatment unit 2 while mixing and stirring with the combustion air A in a high temperature environment. do. That is, in the low-temperature hot air generation unit 11, the heat generated by incinerating the pyrolysis gas G2 is used for heating the low-temperature hot air G4, and the heat generated by the pyrolysis gas incineration unit 5 is the low-temperature hot air generation unit. It is supplied to 4.
Further, in such a low temperature hot air generating unit 11, a relatively high temperature exhaust gas G11 of about 850 ° C. is generated, and a part of the exhaust gas G11 is mixed with the relatively low temperature exhaust gas G1 discharged from the drying processing unit 1 to have an appropriate temperature. The low-temperature hot air G4 is generated, and the remaining exhaust gas G11 is discharged to the atmosphere or the like.
In the present embodiment, the low temperature hot air generating unit 11 is configured to mix the relatively high temperature exhaust gas G11 with the relatively low temperature exhaust gas G1 to generate the low temperature hot air G4 supplied to the drying processing unit 1. However, when the exhaust gas G11 has a relatively low temperature, the exhaust gas G11 may be configured to be supplied to the drying treatment unit 1 as a low temperature hot air G4 without mixing the exhaust gas G2a.

The high-temperature hot air generating unit 3 is configured to generate a high-temperature hot air G3 having a temperature of about 800 ° C. to 1000 ° C., which is higher than that of the low-temperature hot air G4. The drying processing unit 1 is configured as a low temperature side processing unit LP to which the low temperature hot air G4 generated by the low temperature hot air generating unit 11 is supplied. On the other hand, the carbonization treatment unit 2 is configured as a high temperature side treatment unit HP in which the high temperature hot air G3 generated by the high temperature hot air generation unit 3 is supplied to the heater 2a.

Since the exhaust gas G1 discharged from the drying treatment unit 1 contains biomass dust and odorous gas, the exhaust gas G1 is returned to the low temperature hot air generating unit 11 to incinerate the dust and odorous gas contained therein.
On the other hand, the high temperature hot air G3 after passing through the heater 2a of the carbonization treatment unit 2 is discharged from the heater 2a as exhaust gas G2a in a state where the temperature is lowered to about 500 ° C. to 700 ° C., and at least a part thereof is returned to the high temperature hot air generation unit 3. Is done.

The combustion air A preheated by the air preheating unit 8 is distributed and supplied to the high temperature hot air generating unit 3 and the low temperature hot air generating unit 11.

The entire amount of the exhaust gas G11 discharged from the low-temperature hot air generating section 11 is discharged to the atmosphere through the exhaust gas treating section 10, the chimney 12, and the like.
A part of the exhaust gas G2a discharged from the heater 2a of the carbonization treatment section 2 is taken out and returned to the high temperature hot air generating section 3, but the rest is discharged to the atmosphere or the like through the exhaust gas treatment section 10 and the chimney 12.

In the heat recovery unit 7, the exhaust gas G1 returned to the low temperature hot air generating unit 4 is heated by heat exchange with the relatively high temperature exhaust gas G11 discharged from the low temperature hot air generating unit 11 to the atmosphere or the like.
On the other hand, in the air preheating section 8, the combustion air A is preheated by heat exchange with the relatively high temperature exhaust gas G2a discharged from the heater 2a of the carbonization treatment section 2 to the atmosphere or the like.

[Another Embodiment]
Other embodiments of the present invention will be described. It should be noted that the configurations of the respective embodiments described below are not limited to being applied independently, but can also be applied in combination with the configurations of other embodiments.

(1) In the above embodiment, the air preheating unit 8 is provided to preheat the combustion air A supplied to the low temperature hot air generating unit 4 and the high temperature hot air generating unit 3 by heat exchange with the exhaust gas discharged to the atmosphere or the like. However, the location where the air preheating unit 8 is installed and whether or not the air preheating unit 8 is installed can be changed as appropriate.

(2) In the above embodiment, the fossil fuel burner Bf is provided in each of the low temperature hot air generating unit 4 and the high temperature hot air generating unit 3, and the fossil fuel F is burned in order to obtain hot air at a desired temperature. It may be configured to replenish heat in another form to obtain hot air at a desired temperature. Further, when it is possible to obtain hot air at a desired temperature only by supplying the combustion heat of the biomass burner Bv or the heat generated in the pyrolysis gas incineration unit 5 without replenishing another heat, such a case is possible. The configuration for replenishing heat may be omitted.

(3) In the above embodiment, the low temperature hot air generating unit 4 is the first hot air generating unit to which the heat generated by the pyrolysis gas incineration unit 5 is supplied, and the high temperature hot air generating unit 3 is the second unit having the biomass burner Bv. Although the hot air generation unit is used, a biomass burner Bv may be provided in the low temperature hot air generation unit 4 and the heat generated in the pyrolysis gas incineration unit 5 may be supplied to the high temperature hot air generation unit 3.

1 Drying treatment part 2 Carbonization treatment part 3 High temperature hot air generation part (second hot air generation part)
4 Low temperature hot air generator (1st hot air generator)
5 Pyrolysis gas incinerator 8 Air preheating section 11 Low temperature hot air generating section 15 Combustion amount adjusting valve (combustion amount adjusting means)
A Combustion air Bf Fossil fuel burner Bv Biomass burner F Fossil fuel G2 Pyrolysis gas G3 High temperature hot air (hot air)
G4 low temperature hot air (hot air)
X1 Hydrous Biomass X2 Dry Biomass X3 Biomass Carbide

Claims (4)

A drying treatment unit that dries hydrous biomass to produce dry biomass,
A carbonization treatment unit that carbonizes the dry biomass produced in the drying treatment unit to produce biomass carbide, and a carbonization treatment unit.
A pyrolysis gas incinerator that incinerates the pyrolysis gas generated in the carbonization treatment unit is provided.
A first hot air generating unit that burns fuel to generate hot air and supplies the hot air to one of the drying processing unit and the carbonization processing unit.
A biomass carbonization production system including a second hot air generating unit that burns fuel to generate hot air and supplies the hot air to the other side of the drying processing unit and the carbonization processing unit.
The heat generated in the pyrolysis gas incinerator is supplied to the first hot air generating section, and the heat is supplied to the first hot air generating section.
The second hot air generating unit has a biomass burner that takes out a part of the dried biomass generated in the drying processing unit as solid biomass fuel and burns it.
The pyrolysis gas incinerator unit is provided separately from the first hot air generating unit and the second hot air generating unit.
The pyrolysis gas incineration unit heats the exhaust gas returned from the hot air supply target by the first hot air generation unit to the first hot air generation unit by heat exchange with the exhaust gas discharged from the pyrolysis gas incineration unit. A biomass charcoal production system including a heat recovery heat exchange unit for supplying the heat generated in the above to the first hot air generation unit . The first hot air generating part is a low temperature hot air generating part that generates low temperature hot air.
The biomass carbide production system according to claim 1, wherein the second hot air generating unit is a high temperature hot air generating unit that generates high temperature hot air having a temperature higher than that of the low temperature hot air. The invention according to claim 1 or 2 , further comprising an air preheating unit that preheats the combustion air supplied to the first hot air generating unit and the second hot air generating unit by heat exchange with the exhaust gas discharged to the outside. Biomass carbide production system. Claims 1 to 3 each of the first hot air generating unit and the second hot air generating unit have a fossil fuel burner for burning fossil fuel and a combustion amount adjusting means capable of adjusting the combustion amount by the fossil fuel burner. The biomass charcoal production system according to any one of the above items.

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