JP2013146658A - Device for pulverizing woody biomass, and method for pulverization of woody biomass pulverizing after adjusting water content and at once controlling the content to 20 percents or less - Google Patents

Abstract

PROBLEM TO BE SOLVED: To pulverize high-moisture content woody biomass while saving energy to obtain a moisture content and average grain size advantageous to saccharification.SOLUTION: An impact type pulverizing and drying device for pulverizing and drying (dehydrating) a material to be treated is combined with a vibration mill using a ring type pulverizing medium in which a raw material-feeding port and a dry air-introducing nozzle are provided at one end of a cylindrical container, a discharge port and air exhaust nozzle at the other end, and two or more ring type pulverizing media are charged inside the cylindrical container while providing a gap in which the media can be rolled. The woody biomass is pulverized and is made to have a moisture content of 20% or less by feeding a coarsely pulverized biomass having a moisture content adjusted to ≤30% to the material-feeding port of the cylindrical container in the vibration mill using a belt conveyer from the impact type pulverizing and drying device.

Description

  In the biorefinery production in which a woody biomass is saccharified with an enzyme and the converted sugar is converted into a useful chemical by a fungus or yeast, the present invention is used when pulverizing woody biomass as a pre-treatment as a pretreatment. The moisture of the biomass that is scattered at the same time as the fine pulverization is evaporated using the heat generated by the fine pulverization. The present invention relates to a woody biomass pulverization apparatus and a woody biomass pulverization method that finely pulverize a material to be pulverized and reduce the water content of the material to be pulverized, which is reduced from 50% to 20%.

In the Kyoto Protocol target achievement plan decided by the Cabinet in 2005, it aims to introduce 500,000 kL of biomass fuel in crude oil equivalent by 2010.
While maintaining consistency with the “Production Process Schedule for Domestic Biofuels (Primary Report)” compiled by the Biomass and Nippon Comprehensive Strategy Promotion Council in February 2007, it is economically available in large quantities and stably from cellulosic raw materials. In November 2007, the Ministry of Economy, Trade and Industry and the Ministry of Agriculture, Forestry and Fisheries collaborated in collaboration with the Ministry of Agriculture, Forestry and Fisheries of the Ministry of Agriculture, Forestry and Fisheries in order to achieve efficient technological production of fuels. Established “Biofuel Technology Innovation Council” consisting of corporate research institutes, and formulated “Biofuel Technology Innovation Plan” in March 2008 with specific goals, technology development, roadmap, etc. .

Regarding the ethanol production technology of the “Biofuel Technology Innovation Plan”, the two hurdles of pretreatment grinding and enzymatic saccharification are particularly high, and it is said that development should be focused on.
Regarding the pretreatment process, it is important to develop an optimal technique in balance with cost (energy consumption), and it is desired to develop the pulverization method as a common technique.
The fine pulverization method as a pretreatment technique can produce fine powder that makes the efficiency of enzymatic saccharification following the latter stage 80% or more. However, with conventional pulverizers, the water content of the material to be pulverized supplied to the fine pulverization It is necessary to adjust the rate to 20% or less by drying adjustment, and there is a problem that energy consumption in this drying adjustment is large.

As an example, Yakuhisa et al. Of the Osaka Institute of Technology used a mechanical crushing method to finely pulverize woody biomass in the Special Research Report of the Ministry of International Trade and Industry, Ministry of International Trade and Industry in 1985, “Research on Effective Use of Unused Wood Resources”. A method for saccharification with enzymes has been reported.
In this pulverization test, using a vibrating ball mill, a broad-leaved tree with a water content of about 2-7% was crushed with a 2.3 liter crushing tube for 1-3 hours and subjected to enzymatic saccharification. Report high enzymatic saccharification.

  However, the moisture content (= water content contained in wood / dry mass of wood) is generally about 80% for hardwoods and 100% to 130% for conifers at the time of being cut out from the forest. There is a problem that it requires a lot of energy to adjust to%.

In addition, Ito et al. Have reported a research on mechanical grinding technology for bioethanol production (vibrating mill preliminary test using gear-type grinding media) (Non-Patent Document 1).
In this report, as a large-capacity pulverizer capable of applying a high impact force to the cell wall, a new vibration mill using a gear-type pulverizing medium is proposed (Patent Document 1), and 200 g of cedar powder adjusted to a moisture content of 10% is used. By pulverizing for 60 minutes and adjusting to a fine powder with an average particle size of 25 μm or less and a crystallinity of 30% or less, 70% or more of holocellulose (total of cellulose and hemicellulose) can be enzymatically saccharified. This reports that the pulverization time is 1/5 of the conventional pulverizer. Even in the vibration mill using the gear-type grinding medium in this case, it is necessary to reduce the moisture content of the pulverized powder to about 10%, and there remains a problem that much energy is required to adjust the moisture content.

When biomass is wood, as a method for adjusting the moisture content, Ichihara et al. Report that the forest land residual material used for the fuel of the wood chip boiler is stacked and natural drying is performed (Non-patent Document 2).
In this report, when cypress logs and cedar logs are naturally dried in a flat stack, the moisture content before drying of cypress is 76%, and the moisture content before drying of cedar is about 15% by natural drying for 10 months. % Is reduced to about 25% by natural drying for 8 months. However, the moisture content of cedar is not less than about 20%.
In this way, when sufficient space for natural drying of wood can be secured, the moisture content can be adjusted without input of energy, but such places are limited and the moisture content adjustment that minimizes the input of energy Technology is required.

A woody biomass pulverization apparatus capable of maintaining the pulverization performance and achieving stable operation of the pulverizer and reducing the pulverization power even for woody biomass having a high moisture content and a large fluctuation amount, and a control method thereof (Patent Document 2). A woody biomass crusher comprising a crushing table on which woody biomass is placed, a roller that crushes woody biomass by applying a pressing force, and an air supply means for supplying air to the grinder. A moisture content detection means for detecting the moisture content of the woody biomass inside the machine, and a moisture content adjustment control means for adjusting the detected moisture content to be below the fiber saturation point and above the particle temperature rising point. Specifically, the moisture content of the woody biomass at the outlet of the crusher is detected by a humidity sensor, and the heating temperature of the supply air is adjusted by controlling the air supply means based on the moisture content, and the inside of the crusher The water content is maintained.
However, since the heat | fever for moisture content adjustment is obtained by burning the pulverized woody biomass powder as a fuel, it is a problem that the yield in pulverizing woody biomass decreases.

Moreover, there is an apparatus (Patent Document 3) that performs a process of removing moisture from waste as a processing apparatus for waste containing moisture. The processing apparatus for waste containing water includes a mixing apparatus, a water removal apparatus, a waste supply apparatus, and a water removal treatment agent supply apparatus. The waste is pulverized by the rotation of the pulverization stirring blade, It is stirred uniformly and dehydrated.
However, since water is removed and pulverized for waste, it is difficult to adjust the water content and pulverize appropriately for the use of woody biomass.

Furthermore, a disc having a hole formed in the center where the difference in the outer diameter between the inner diameter of the crushing vessel installed horizontally and the disc with a protrusion on the outer peripheral surface is 60 mm or less is placed in the crushing vessel, There has also been proposed a pulverizing apparatus (Patent Document 4) for pulverizing a woody biomass material by vibrating vertically and horizontally and rolling the disc along the inner surface of the pulverizing container.
Since the above-mentioned pulverizing apparatus can apply a high impact force, a high saccharide conversion rate can be achieved by saccharifying the powder obtained by pulverizing woody biomass for about 1 hour with an enzyme. Moreover, in order to cool the grinding | pulverization medium inside a cylindrical container, it has the structure which inject | pours the cooled dry air into a cylindrical container, heat-exchanges inside a cylindrical container, and discharges | emits it. In this case, the moisture content of the pulverized raw material is about 15%.

In addition, an impact pulverization / drying apparatus (Patent Document 5) that pulverizes and dries (dehydrates) a processed material by the impact of a bar rotating at a high speed in the lower part of the pulverization / drying chamber has been proposed.
When this apparatus is applied to woody biomass, efficient drying can be performed, but the average particle size of the obtained fine powder is 100 μm or more, and it is possible to produce a fine powder with an enzymatic saccharification efficiency of 80% or more. Can not.

  On the other hand, the present applicants installed a cylindrical crushing container horizontally on the vibration base, provided a raw material supply port and an air introduction nozzle at one end of the crushing container, and provided a fine powder outlet and an air discharge nozzle at the other end. In addition, a plurality of ring-type grinding media are provided inside the grinding container with a gap that allows the ring-type grinding media to roll in the grinding container, and a horizontal vibration mechanism and a circular vibration mechanism are used. When an exciting force is applied in the horizontal direction and the vertical direction, a lateral vibration is generated in the grinding container due to the horizontal exciting force, and a vertical vibration is generated in the grinding container due to the vertical exciting force. A ring-type pulverized medium-use vibration mill (Patent Document 6) is proposed, in which the ring-shaped pulverized medium rolls in accordance with the period of vibration applied along the wall surface of the pulverization container by the excitation force of .

A woody biomass powder having an average particle size of 500 μm is charged into the ring-type grinding medium-use vibration mill (lower side in FIG. 1, lower side in FIG. 2, and shown in FIG. 3), and the following test is performed using dry air. Went.
(1) FIG. 4 shows changes in moisture content over time when the flow rate of dry air is kept constant at 10 L / min and the powder charge is changed to 2 L / min, 5 L / min, and 10 L / min.
(2) FIG. 5 shows changes in moisture content over time when the powder charge is kept constant at 10 L / min and the air flow rate of dry air is changed to 10 L / min, 20 L / min, and 30 L / min.
(3) Changes in average particle diameter (μm) over time when the air flow rate of dry air is kept constant at 10 L / min and the powder charge is changed to 2 L / min, 5 L / min, and 10 L / min. It is shown in FIG.
(4) Changes in the average particle diameter (μm) over time when the powder charge is kept constant at 10 L / min and the air flow rate of dry air is changed to 10 L / min, 20 L / min, and 30 L / min. 7 shows.
The average particle size was measured with Nikkiso Microtrac, HRA-X-100.

As is clear from the above test, the ring-type pulverizing medium-use vibration mill has an average particle size of 25 μm or less and a moisture content of 20% or less of the woody biomass fine powder capable of making the enzymatic saccharification efficiency 80% or more. Can be reduced.
However, it is very difficult to reduce the moisture content to 20% or less with respect to the woody biomass powder having a moisture content exceeding 100%, and further improvement is required for the vibration mill using the ring-type grinding medium. ing.

JP 2008-093590 A Japanese Patent No. 4801552 JP 2003-136100 A JP 2009-233542 A Canadian Patent No. 2218429 (USP 6,024,307) Japanese Patent Application No. 2010-151033

Ito et al. “Research on mechanical crushing technology for bioethanol production (vibration mill preliminary test using gear-type crushing media)” Resource Material Society Resources and Materials 2007 (Nagoya) Plan announcement and general presentation C7 environment (general presentation) Ichihara et al., “Natural Drying of Remnants of Forest Land Used as Fuel for Wood Chip Boilers” Nichibayashi (2009) 91: 192-200

  The problem to be solved is to achieve an average particle size that is advantageous for efficient saccharification with enzymes by reducing the water content while crushing biomass with high water content while performing high impact pulverization. Is obtained in a short time and at low cost, that is, with less energy.

In order to finely pulverize high moisture content biomass with high efficiency, large capacity and energy saving while adjusting the moisture content,
An impact-type crushing / drying device that crushes and dries (dehydrates) the processed material by the impact of a bar rotating at a high speed in the lower part of the crushing and drying chamber;
A cylindrical crushing container is installed horizontally on the vibration base, a raw material supply port and an air introduction nozzle are provided at one end of the crushing container, a fine powder outlet and an air discharge nozzle are provided at the other end, and the inside of the crushing container is also provided. In this method, a plurality of ring-type grinding media are loaded with a gap that allows the ring-type grinding media to roll in the grinding vessel, and are applied in the horizontal and vertical directions by the horizontal and circular vibration mechanisms. When a vibration force is applied, a lateral vibration is generated in the grinding container due to a horizontal excitation force, and a vertical vibration is generated in the grinding container due to a vertical vibration force. The mold grinding medium comprises a ring-type grinding medium-use vibration mill that rolls in accordance with the vibration period given along the wall of the grinding container,
It is a woody biomass pulverizer that supplies coarsely pulverized material from an impact pulverizer / dryer to a raw material supply port of a pulverization container of a ring-type pulverizing medium using vibration mill by a belt conveyor.

The pulverizing container of the ring-type pulverizing medium using vibration mill is a woody biomass pulverizing apparatus, wherein a sieve structure is inserted into an opening of the ring-type pulverizing medium.
This sieve structure can be adjusted so that air moistened with moisture contained in biomass is effectively discharged from the side surface of the cylindrical container by sequentially reducing the opening mesh of the sieve from the raw material introduction side.

  In the vibration mill using the ring-type grinding medium, (1) the plate thickness of the ring-type grinding medium is gradually decreased from the raw material charging side to the outlet side, and (2) the ring-type grinding medium opening diameter is increased. 3) By changing the shape of the ring outer periphery of the ring-type grinding medium, the length from the raw material inlet to the minimum raw material diameter is shortened by grinding the raw material having a large particle size with the ring-type grinding medium having a large mass. This is a woody biomass pulverizing apparatus characterized in that

Also, using the woody biomass pulverizer,
Supply woody biomass with a high water content to an impact pulverization / drying device, adjust the water content to 30% or less, coarsely pulverize, and use a belt conveyor to ring the coarsely pulverized product with a reduced water content. By supplying to the raw material supply port of the grinding container of the vibration mill using the mold grinding medium, introducing dry air from the air introduction nozzle, and discharging the water vaporized by the heat accumulated in the ring grinding medium from the air discharge nozzle. The most important feature is that the water content is reduced to 20% or less simultaneously with the pulverization.

  The ring-type pulverizing medium-use vibration mill is a ring-type pulverizing medium in which the difference between the outer diameter of the ring-type pulverizing medium and the inner diameter of the pulverizing container is set to a constant value corresponding to the vibration acceleration of the pulverizing container. By increasing the outer diameter of the grinding medium, it is possible to ensure high-speed rolling of the ring-type grinding medium along the inner wall of the grinding container. Therefore, if the inner diameter of the grinding container is increased, it becomes possible to increase the mass of the grinding medium. Since the efficiency can be improved, the efficiency of the pulverizer is improved as the apparatus is enlarged and the capacity is increased.

The present invention has the following effects.
(1) When pulverizing woody biomass with a high water content, normally, even if the powder is agglomerated due to the water scattered by the pulverization and the pulverization is impossible, the moisture is quickly removed from the cylindrical container. Since it can be discharged, there is an advantage that it can be finely pulverized without causing aggregation.
(2) Since the moisture content can be reduced at the same time as pulverizing woody biomass with a high moisture content, the energy used for prior drying can be reduced, greatly increasing the total energy in the pretreatment process. Can be reduced.
(3) The moisture content can be reduced to 20% or less simultaneously with the fine pulverization, and a fine powder having a high saccharification rate can be obtained even for biomass having a high moisture content.
(4) When a sieve is provided at the opening of the ring-type grinding medium, there is an advantage that moisture released from the woody biomass can be effectively discharged from the side surface of the grinding container.
(5) By providing a structure in which the weight of the ring-type grinding medium charged in the grinding container is gradually reduced from the end plate on the raw material charging side, the raw material is crushed with a large mass of the ring-type grinding medium to supply the raw material. There is an advantage that the length from the mouth part until the raw material particle diameter becomes the minimum diameter can be shortened, and intercellular water or the like can be scattered during that time to obtain a water content of 10% or less.

FIG. 1 is a schematic view showing that an impact pulverization / drying apparatus and a ring-type pulverizing medium-use vibration mill are connected by a belt conveyor, and the ring-type pulverization medium-use vibration mill is a front view. Example 1 FIG. 2 is a schematic view showing that the impact pulverization / drying apparatus and the ring-type pulverizing medium-use vibration mill are coupled by a belt conveyor, and the ring-type pulverization medium-use vibration mill is a side view. Example 1 FIG. 3 is a cross-sectional view of a grinding container of a vibration mill using a ring-type grinding medium. Example 1 FIG. 4 is a diagram showing a change in moisture content with time when a ring-type grinding medium-use vibration mill is used, the airflow rate is kept constant, and the powder charge is changed. FIG. 5 is a diagram showing a change in moisture content over time when a ring-type grinding medium-based vibration mill is used, the powder charge is kept constant, and the air flow rate is changed. FIG. 6 is a diagram showing a change in average particle diameter (μm) over time when a ring-type grinding medium-use vibration mill is used, the air flow rate is kept constant, and the powder charge is changed. FIG. 7 is a diagram showing a change in average particle diameter (μm) over time when a ring-type grinding medium-use vibration mill is used, the powder charge is kept constant, and the air flow rate is changed.

The present invention includes an impact pulverization / drying apparatus that performs pulverization / drying (dehydration) of a processed product by the impact of a bar rotating at a high speed in the lower part of the pulverization / drying chamber;
A cylindrical crushing container is installed horizontally on the vibration base, a raw material supply port and an air introduction nozzle are provided at one end of the crushing container, a fine powder outlet and an air discharge nozzle are provided at the other end, and the inside of the crushing container is also provided. In this method, a plurality of ring-type grinding media are loaded with a gap that allows the ring-type grinding media to roll in the grinding vessel, and are applied in the horizontal and vertical directions by the horizontal and circular vibration mechanisms. When a vibration force is applied, a lateral vibration is generated in the grinding container due to a horizontal excitation force, and a vertical vibration is generated in the grinding container due to a vertical vibration force. The mold grinding medium comprises a ring-type grinding medium-use vibration mill that rolls in accordance with the vibration period given along the wall of the grinding container,
A woody biomass pulverizing apparatus, characterized in that a coarsely pulverized product from an impact pulverizing / drying apparatus is supplied to a raw material supply port of a pulverizing container of a ring-type pulverizing medium using vibration mill by a belt conveyor.

  Further, the present invention is the woody biomass pulverizing apparatus characterized in that, in the ring-type pulverizing medium utilizing vibration mill, a sieve structure is inserted into an opening of the ring-type pulverizing medium.

  Furthermore, the present invention provides the ring-type grinding medium-use vibration mill, wherein (1) the plate thickness of the ring-type grinding medium is gradually reduced from the raw material charging side to the outlet side. (3) By changing the shape of the ring outer periphery of the ring-type grinding medium, the raw material diameter is minimized from the raw material inlet by grinding the raw material having a large particle diameter with the ring-type grinding medium having a large mass. A woody biomass pulverizing apparatus characterized in that the length is shortened.

And this invention uses the said woody biomass pulverization apparatus,
Supply woody biomass with a high water content to an impact pulverization / drying device, adjust the water content to 30% or less, coarsely pulverize, and use a belt conveyor to ring the coarsely pulverized product with a reduced water content. By supplying to the raw material supply port of the grinding container of the vibration mill using the mold grinding medium, introducing dry air from the air introduction nozzle, and discharging the water vaporized by the heat accumulated in the ring grinding medium from the air discharge nozzle. A pulverization method characterized in that the water content is 20% or less simultaneously with pulverization.

Example 1 is composed of an impact pulverization / drying device and a ring-type pulverization medium-use vibration mill, and the coarsely pulverized product from the impact-type pulverization / drying device is pulverized by the ring-type pulverization medium-use vibration mill using a belt conveyor. It supplies to the raw material supply port.
FIG. 1 is a schematic view showing that an impact pulverization / drying apparatus and a ring-type pulverizing medium-use vibration mill are connected by a belt conveyor, and the ring-type pulverization medium-use vibration mill is a front view.
FIG. 2 is a schematic view showing that the impact pulverization / drying apparatus and the ring-type pulverizing medium-use vibration mill are coupled by a belt conveyor, and the ring-type pulverization medium-use vibration mill is a side view.
The impact type pulverization / drying apparatus is publicly known (Patent Document 5), and the ring-type pulverizing medium-use vibration mill is the one filed earlier by the present applicant (Patent Document 6). Is omitted.

FIG. 3 is a cross-sectional view of the cylindrical crushing container 2 of the ring-type crushing medium utilizing vibration mill 1.
The pulverization container 2 is composed of three members. A raw material supply port 3 is provided at the upper part of one end A, an air flow introduction nozzle 4 is provided at the end face, and a cooling water inlet nozzle 5 is provided at the lower part. It is connected with a flange. These inner surfaces are covered with a liner 6 and accommodate a ring-type grinding medium 7.
A fine powder discharge port 8 is provided at the lower part of the other end C of the pulverization container 2, an air flow discharge nozzle 9 is provided at the end face, and a cooling water outlet nozzle 10 is provided at the upper part.
After the ring-type grinding medium 7 is accommodated, the ring-type grinding medium 7 is coupled to the other main body B of the grinding container 2 by a ring stopper 11 having a slit.
The surfaces of these three members are covered with a water cooling jacket 12.

In Example 1, the length of the crushing container 2 is 740 mm, the outer diameter is 216.3 mm, and the inner diameter is 155 mm.
The diameters of the raw material supply port 3 and the fine powder discharge port 8 are both 76 mm, and the diameters of the air flow introduction nozzle 4 and the air flow discharge nozzle 9 are 27 mm.
Further, the ring-type grinding medium 7 is made of carbon steel for mechanical structure (JIS standard / G4051), and has a diameter of 132 mm, an inner diameter of 50 mm, and a thickness of 52 mm.
In Example 1, the ring-type grinding media 7 are all the same type and contain 14 sheets.
As a specific example of the circular motion excitation, the rotational speed of the circular motion is 1600 rpm and the amplitude is 7 mm using a 5 KW drive motor.
The sizes and shapes of the pulverization container 2 and the ring-type pulverization medium 7 are not limited to the numerical values of the specific examples.

Example 2 is composed of the impact-type grinding / drying device of Example 1 and a vibration mill 1 using a ring-type grinding medium. This is a pulverization method in which the material is supplied to the raw material supply port 3 of one pulverization container 2 and pulverized.
As woody biomass having a high water content, cedar powder having a water content of 122% was used, and the energy required until the water content became 10% was tested.
In addition, in the paragraph [0014], it is very difficult to reduce the moisture content to 20% or less with respect to the woody biomass powder having a moisture content exceeding 100% with the ring-type grinding medium-use vibration mill 1 alone. As described as difficult, it was impossible to make the water content 10%, so it was excluded from the comparison.
The following three methods are compared.
a: simple heat drying b: pulverized and dried to a water content of 10% by an impact pulverization / drying apparatus, and then the coarsely pulverized product was finely pulverized by a vibration mill 1 using a ring type pulverizing medium.
c: The water content was pulverized and dried to 28% with an impact pulverizer / dryer, and then the coarsely pulverized product was finely pulverized from the water content 28% to the water content 10% with the vibration mill 1 using a ring-type pulverizing medium.

The results of Example 2 are shown below.
a: | 11.1 MJ / Kg
Coarse grinding + drying energy | Fine grinding energy | Total
b: 4.73 MJ / Kg | 0.95 MJ / Kg | 5.68 MJ / Kg
c: 2.50 MJ / Kg | 1.11 MJ / Kg | 3.61 MJ / Kg

In the case of simple heat drying, the calculation was performed assuming that the specific heat of water is 4.2 kJ / KgK, the specific heat of cedar 1.3 kJ / KgK, the heat of evaporation of water 2.6 MJ / Kg, and the thermal efficiency 25%.

From the above results, when drying using energy during pulverization, energy can be greatly reduced as compared with simple heat drying.
Further, by combining the impact pulverization / drying device and the ring-type pulverization medium-use vibration mill 1, it becomes possible to further reduce the energy required for drying.
And the fine powder of the average particle diameter of 25 micrometers or less which can make the efficiency of the enzyme saccharification following a latter stage 80% or more can be produced | generated.

Example 3 is an example of the ring-type grinding medium 7 in which a sieve structure is inserted in the opening of the ring-type grinding medium 7 of the vibration mill 1 using the ring-type grinding medium.
Specifically, a sieve structure is inserted into an inner diameter of 50 mm of the ring-type grinding medium 7 of Example 1. (The illustration is omitted.)

Example 4 is an example of the ring-type pulverizing medium 7 in which the plate thickness of the ring-type pulverizing medium 7 of the vibration mill 1 using the ring-type pulverizing medium is gradually decreased from the raw material charging side to the outlet side.
Specifically, this is an example of the ring-type grinding medium 7 in which the plate thickness 52 mm of the ring-type grinding medium 7 of Example 1 is sequentially reduced. (The illustration is omitted.)

Example 5 is an example of the ring-type grinding medium 7 in which the opening diameter of the ring-type grinding medium 7 of the ring-type grinding medium-use vibration mill 1 is increased.
Specifically, this is an example of the ring-type grinding medium 7 that is larger than the inner diameter 50 mm of the ring-type grinding medium 7 of Example 1. (The illustration is omitted.)

Example 6 is an example of the ring-type grinding medium 7 in which the shape of the ring outer periphery of the ring-type grinding medium-use vibration mill 1 is changed.
Specifically, this is an example of the ring-type grinding medium 7 in which the edge of the ring-type grinding medium 7 of Example 1 is scraped or provided with a protrusion. (The illustration is omitted.)

  For the treatment of inorganic materials currently commercialized in plants that produce bioethanol with a production scale of 15,000 kL / year using herbaceous / woody biomass (rice husk, rice husk, eucalyptus, cedar thinned wood, etc.) The vibration mill using a grinding medium such as a 2.6 ton / hr ball or rod cannot properly pulverize unless the moisture content of the biomass raw material is dried to about 15% in advance. Although this drying requires a lot of energy, economic efficiency cannot be ensured, but when adjusting the moisture content in parallel with the fine pulverization of the biomass of the present invention, compared with the existing vibration mill that requires pre-drying. Therefore, a significant energy reduction can be expected in the drying and grinding processes.

  Utilizing the present invention, woody biomass such as thinned wood produced in Japan can be pulverized efficiently near the logging site, and produced in various places in a bioethanol production plant with a production scale of 15,000 kL / year If bio-ethanol is produced by transferring fine powder, its production cost will be sufficiently competitive with imported products, and thinned wood that is currently left between forests can be used as a resource, while at the same time promoting the forest industry. And contribute to the conservation of the land.

  In addition, by using the present invention, the present invention can also be applied to the construction of a bioethanol production plant that uses an enzyme-based sugar conversion system with a production scale of 200,000 kL / year outside the country that can produce raw materials for energy conversion such as eucalyptus. .

  Furthermore, the cost of manufacturing bioethanol obtained by pulverizing herbaceous and woody biomass, followed by saccharification and ethanol fermentation, can compete with the price of gasoline. Reducing sugar can be produced, and this sugar can be applied to the construction of a recycling industry using biomass by converting various sugars into useful chemical intermediates using various fermentative bacteria and yeasts.

A One end portion of the pulverization container 2 B Main body portion of the pulverization container 2 C Other end portion of the pulverization container 2 1 Ring-type pulverization medium utilizing vibration mill 2 Cylindrical pulverization container 3 Raw material supply port 4 Airflow introduction nozzle 5 Cooling water Inlet nozzle 6 Liner 7 Ring-type grinding medium 8 Fine powder outlet 9 Airflow outlet nozzle 10 Cooling water outlet nozzle 11 Ring stopper 12 having a slit 12 Water cooling jacket

Further, an impact pulverization / drying apparatus (Patent Document 5) that pulverizes and dries (dehydrates) a processed material (glass, rock, rubber) by the impact of a bar rotating at a high speed in the lower part of the pulverization / drying chamber has been proposed.
When this impact pulverization / drying device is applied to woody biomass, efficient drying can be performed, but the average particle size of the obtained powder is a coarsely pulverized product of 100 μm or more, and the efficiency of enzymatic saccharification is increased to 80% or more. Cannot produce fine powder.

From the above results, when drying is performed using energy at the time of pulverization by a pulverizer, the energy can be greatly reduced as compared with simple heat drying.
Further, in an impact pulverization / drying apparatus , the water content is adjusted to be 30% or less and coarsely pulverized, and the coarsely pulverized material having the reduced water content is supplied to the ring-type pulverized medium-use vibration mill 1. the Rukoto to milling, it is possible to further reduce the energy required for drying.
And the fine powder of the average particle diameter of 25 micrometers or less which can make the efficiency of the enzyme saccharification following a latter stage 80% or more can be produced | generated.

Claims (4)

An impact-type crushing / drying device that crushes and dries (dehydrates) the processed material by the impact of a bar rotating at a high speed at the bottom of the crushing and drying chamber;
A cylindrical crushing container is installed horizontally on the vibration base, a raw material supply port and an air introduction nozzle are provided at one end of the crushing container, a fine powder outlet and an air discharge nozzle are provided at the other end, and the inside of the crushing container is also provided. In this method, a plurality of ring-type grinding media are loaded with a gap that allows the ring-type grinding media to roll in the grinding vessel, and are applied in the horizontal and vertical directions by the horizontal and circular vibration mechanisms. When a vibration force is applied, a lateral vibration is generated in the grinding container due to a horizontal excitation force, and a vertical vibration is generated in the grinding container due to a vertical vibration force. The mold grinding medium is composed of a ring-type grinding medium-based vibration mill that rolls in accordance with the vibration period applied along the wall surface of the cylindrical container.
A woody biomass pulverizing apparatus characterized in that a coarsely pulverized product from an impact pulverizing / drying apparatus is supplied to a raw material supply port of a pulverizing container of a ring-type pulverizing medium using a belt conveyor by a belt conveyor.   2. The woody biomass pulverizing apparatus according to claim 1, wherein a sieve structure is inserted into an opening of the ring-type pulverizing medium.   In the vibration mill using a ring-type pulverized medium according to claim 1, (1) the plate thickness of the ring-type pulverized medium is gradually decreased from the raw material input side to the outlet side, and (2) the ring-type pulverized medium opening diameter is increased. (3) The length from the inlet of the raw material to the minimum of the raw material diameter by changing the shape of the ring outer periphery of the ring-type pulverizing medium to pulverize the raw material having a large particle diameter with the ring-type pulverizing medium having a large mass. A woody biomass pulverizing apparatus characterized by shortening the length. Using the woody biomass pulverizing apparatus according to claims 1 to 3,
Supply woody biomass with a high water content to an impact-type crushing / drying device, adjust the water content to 30% or less, and coarsely pulverize the coarsely pulverized product with a reduced water content. It is supplied to the raw material supply port of the cylindrical container of the vibration mill using a ring-type pulverizing medium by a belt conveyor, the dry air is introduced from the air introduction nozzle, and the water vaporized by the heat accumulated in the ring-type pulverizing medium is discharged from the air discharge nozzle. A pulverization method characterized in that the water content is reduced to 20% or less simultaneously with fine pulverization.