JPH06213568A - Device for improving quality of wood - Google Patents

Abstract

PURPOSE:To provide a device for improving the quality of wood which enables the production of improve wood of high quality using hot air even if drying rate is raised. CONSTITUTION:A device for improving the quality of wood includes a wood storage room 1 which can be tightly closed, a combustion gas generator 2 having a combustion air introducing passage, a combustion gas feed passage 3 leading at least from the upper part of the generator 2 to the upper part of the room 1, a gas outlet passage 6 leading from the bottom of the room 1 to a chimney, and a gas recovery passage 5 leading from the bottom of the room 1 to the combustion air introducing passage 4. And a steam generator is provided in the combustion gas generator 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wood drying apparatus, and more particularly to a heating and drying apparatus for converting felled wood into dry wood having a stable water content in a short period of time.

[0002]

2. Description of the Related Art Wood that has been cut down contains a large amount of water, and since it also has insects and its eggs, it can be dried or treated with chemicals to kill insects and eggs. It was usually commercialized as a building material or furniture material. Since such a method of drying wood has conventionally been done by natural drying, it is necessary to leave it for a long period of 3 to 5 years while transshipping the wood and the like, and not only the efficiency of fund rotation is poor. There was also a fear of new insect damage.

Therefore, various methods of drying wood in a short period of time have been proposed, for example, a method of vacuum drying and a method of sending hot air into a drying chamber containing wood. However, the wood obtained by such a rapid drying method has the same defects as the dried wood obtained by the conventional natural drying method, such as cracking and distortion due to reabsorption of water.

On the other hand, as a wood drying method for improving such drawbacks, a gas obtained by burning a fuel such as wood is directly introduced into a drying chamber containing wood, and the temperature of the combustion gas and A method has been proposed in which drying, insecticidal, and egg killing are simultaneously performed by a cooperative action with various contained smoke components, and a chemical treatment is omitted and a dry wood that is less likely to cause distortion is obtained.

As one of the methods of this kind, for example, in Japanese Patent Laid-Open Nos. 59-129373 and 60-103281, hot air is passed through the upper part of the processing chamber containing the wood and the lower part of the processing chamber. A method for drying wood by passing cold air is proposed, and an apparatus for carrying out this method is also disclosed.However, in such a method, the processing efficiency of wood is low, and in order to improve the processing efficiency, the inside of the processing chamber is When a large amount of wood is loaded, there is a problem that the dryness of the treated wood varies widely and the quality becomes uneven.

As a result of various researches for solving the above problems, the present inventor has invented an improved wood drying apparatus capable of efficiently and uniformly drying a larger amount of wood than the conventional wood drying apparatus. Have applied for a patent (Japanese Patent Application Laid-Open No. 4-
148184). This apparatus includes a wood storage chamber that can be sealed, a combustion gas generation furnace having a combustion air introduction passage, a combustion gas supply passage that leads from the upper part of the furnace to the upper part of the wood storage chamber, and the wood storage chamber. It has a gas discharge passage from the bottom to the chimney and a gas recovery passage from the bottom of the wood containing chamber to the furnace, and a gas flow rate control device is provided in at least one of the gas discharge passage and the gas recovery passage. It is a wood drying device characterized by that.

[0007]

Such a wood dryer has excellent wood-drying efficiency, but when it is attempted to quickly dry wood with a large thickness, even if the edges of the wood are dried, Since it is difficult to dry the product and the product has distortions, it is not efficient because it limits the drying speed. Therefore, the present invention further improves the above-described wood drying apparatus invented by the present inventor (hereinafter referred to as the “pre-invention apparatus”) to produce dried wood of excellent quality even if the drying speed is increased. It is intended to provide an improved wood drying device capable of

[0008]

SUMMARY OF THE INVENTION Such an improved wood drying apparatus is provided with a sealable wood containing chamber, a combustion gas generating furnace having a combustion air introducing passage, and at least an upper part of the furnace for the wood containing chamber. A combustion gas supply passage leading to an upper portion, a gas discharge passage leading from the bottom of the wood containing chamber to the chimney, and a gas recovery passage leading from the bottom of the wood containing chamber to the combustion air introducing passage, It is characterized in that a steam generator is provided in the furnace.

The wood drying apparatus of the present invention has a main structure similar to that of the apparatus of the prior invention, and includes a sealable wood storage chamber, a combustion gas generation furnace having a combustion air introduction passage, and an upper part of the furnace. A combustion gas supply passage leading to the upper portion of the wood containing chamber, a gas discharge passage leading to the chimney from the bottom portion of the wood containing chamber, and a gas recovery passage leading to the combustion air introducing passage from the bottom portion of the wood containing chamber. That they have in common.

The wood drying apparatus of the present invention is improved in that a steam generator is newly provided in the same combustion gas generating furnace as in the apparatus of the prior invention.
As such a steam generator, for example, a wet-wall type evaporator or a spray evaporator is used, but as a wet-wall type evaporator, it has a metallic lattice-shaped or a cage-shaped or plate-shaped evaporation surface,
A device configured such that water is poured little by little into this is preferably used.

[0011]

In the wood drying apparatus of the present invention, when fuel such as wood chips is burned in the combustion gas generation furnace, the combustion gas containing smoke flows into the upper part of the wood containing chamber through the combustion gas supply passage. The hot combustion gas passes between the woods loaded in the wood storage chamber, flows downward while heating and drying the woods, flows out from the bottom of the wood storage chamber, and is discharged from the chimney through the gas discharge passage. In this way, most of the gas in the timber storage chamber is guided from the bottom of the timber storage chamber to the combustion air introduction passage by the gas recovery passage, mixed with fresh combustion air and returned to the combustion gas generation furnace to generate combustion gas again. It circulates from the furnace to the wood storage chamber, but in the steam generator, steam is generated by the heat of the combustion gas and circulates as hot humid gas.

The high-humidity combustion gas thus circulated is effective for making the temperature distribution in the wood storage chamber uniform,
Due to the high humidity in the combustion gas, desorption of water near the surface of the wood is slowed, and the temperature of the wood rapidly rises to the core. When the temperature inside the wood storage chamber exceeds 100 ° C, the moisture in the wood core is promoted to vaporize and diffuses to the sides. However, since the shrinkage and hardening of the wood side does not occur due to drying, the moisture diffusion is hindered. The moisture is desorbed faster than the case where the high temperature combustion gas of low humidity is circulated.

As the water content of the wood decreases, the moisture content of the wood is reduced to gradually reduce the atmospheric humidity, and dehydration and drying of the core and the side of the wood proceed in parallel. It can be dried uniformly without causing distortion. In addition, volatile components and the like generated when the wood dries are once returned to the combustion gas generation furnace, decomposed and burned, and then discharged from the chimney, so there is little risk of air pollution.

[0014]

EXAMPLE As shown in FIG. 1, a wood drying apparatus according to the present invention is provided with a wood containing chamber 1 and a combustion gas generating furnace 2 which are adjacent to each other, in which wood to be dried can be loaded and sealed. The upper portions thereof communicate with each other through a plurality of combustion gas supply passages 3. Each of these combustion gas supply paths 3 is provided with a gate 31 for adjusting the gas flow rate so that the gas flow in the wood containing chamber 1 can be averaged.
Further, a steam generator 8 formed of an iron grid is attached in the middle of the wall of the combustion gas generation furnace 2, and a tap water supply port 81 from the outside is provided immediately above the steam generator 8. At the bottom of the combustion gas generating furnace 2 is formed a fire chamber 21 in which fuel such as waste wood can be injected and burned, and the combustion air introducing passage 4 is connected to the fire chamber 21. A damper 41 that can limit the amount of intake of outside air is provided at the open end of the combustion air introduction passage 4.

A plurality of gas recovery passages 5 are connected to a plurality of positions on the bottom of the wood containing chamber 1 and communicate with a plurality of positions of the combustion air introduction passage 4, respectively. A damper 51 is provided on each of these gas recovery paths 5. A gas discharge path 6 is connected to the bottom of the wood containing chamber 1 at a position farthest from the combustion gas supply path 3 and communicates with a chimney 7. A damper 61 for adjusting the amount of gas discharged to the chimney 7 is provided in the middle of the gas discharge path 6.

In the thus constructed wood drying apparatus, after the wood loaded on the truck is carried into the wood storage chamber 1, the door is closed and sealed, and then the wood is put into the combustion gas generation furnace 2. When the fuel such as scrap is ignited, the combustion gas flows into the wood containing chamber 1 from the upper part of the combustion gas generation furnace 2 through the respective combustion gas supply passages 3. At this time, if the damper 61 is closed, the air in the wood containing chamber 1 is burned from the plurality of gas recovery passages 5 through the combustion air introducing passage 4 as the interior of the wood containing chamber 1 is filled with the high temperature combustion gas. The circulation of the gas is continued until it is sucked into the gas generating furnace 2 and the entire wood containing chamber 1 is filled with the high temperature combustion gas.

In this way, the air in the apparatus is the combustion gas generating furnace 2
At this time, the atmosphere in the wood containing chamber 1 becomes hot as it is converted into high temperature combustion gas, but at this time, water is gradually supplied from the tap water supply port 81 to the steam generator 8 which is heated by contacting with the combustion gas. Then, water vapor is generated and the wood storage chamber 1
The atmosphere inside becomes high humidity at the same time, but the oxygen concentration also decreases and the combustion speed of the fuel in the combustion gas generating furnace 2 slows down, so that the temperature in the wood containing chamber 1 also does not rise. At this time, if the damper 61 is slightly opened to allow a part of the gas in the wood containing chamber 1 to escape to the chimney 7 through the gas discharge path 6,
An amount of fresh air corresponding to the amount of gas discharged is sucked in through the combustion air introducing passage 4, and the combustion speed of the fuel is automatically adjusted so as not to become too slow.

At this time, the dampers 5 of the gas recovery passages 5 are
By adjusting 1 so that the gas in the wood containing chamber 1 is sucked into the combustion air introducing passage 4 on average, the temperature distribution in the wood containing chamber 1 can be further averaged. In this way, in the timber storage chamber 1 filled with a uniform atmosphere of high temperature and high humidity and low oxygen concentration, the loaded timber is dried uniformly, and is efficiently dried, killed by insects, and killed by eggs. Dry wood is produced. Most of the volatile matter generated from the wood during drying is also sucked into the combustion gas generation furnace 2 and decomposed by combustion to circulate in the apparatus, so that environmental pollution due to the gas discharged from the chimney 7 is significantly reduced. .

[0019]

EFFECTS OF THE INVENTION According to the wood drying apparatus of the present invention, since the wood storage chamber is kept in a high temperature and high humidity atmosphere with a uniform low oxygen concentration for drying, not only stable operation but also uniform quality can be achieved. There is an advantage that dry wood can be economically produced with high efficiency and high yield.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing a configuration of a wood drying apparatus of the present invention.

[Explanation of symbols]

 1 Wood Storage Room 2 Combustion Gas Generation Furnace 21 Fire Chamber 3 Combustion Gas Supply Channel 31 Gate 4 Combustion Air Introduction Channel 41 Damper 5 Gas Recovery Channel 51 Damper 6 Gas Discharge Channel 61 Damper 7 Chimney 8 Steam Generator 81 Tap Water Supply Port

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[Procedure amendment]

[Submission date] January 29, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction content]

[Document name] Statement

[Title of Invention] Wood reforming device

[Claims]

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wood reforming apparatus, and more particularly to a heat reforming apparatus for converting felled wood into modified wood having a stable water content in a short period of time.

[0002]

2. Description of the Related Art Wood that has been cut down contains a large amount of water, and since it also has insects and its eggs, it can be dried or treated with chemicals to kill insects and eggs. It was usually commercialized as a building material or furniture material. Since such a method of drying wood has conventionally been done by natural drying, it is necessary to leave it for a long period of 3 to 5 years while transshipping the wood and the like, and not only the efficiency of fund rotation is poor. There was also a fear of new insect damage.

Therefore, various methods of drying wood in a short period of time have been proposed, for example, a method of vacuum drying and a method of sending hot air into a drying chamber containing wood. However, the wood obtained by such a rapid drying method has the same defects as the dried wood obtained by the conventional natural drying method, such as cracking and distortion due to reabsorption of water.

On the other hand, as a wood drying method for improving such drawbacks, a gas obtained by burning a fuel such as wood is directly introduced into a drying chamber containing wood, and the temperature of the combustion gas and A method has been proposed in which drying, insecticidal, and egg killing are simultaneously performed by a cooperative action with various contained smoke components, and a chemical treatment is omitted and a dry wood that is less likely to cause distortion is obtained.

As one of the methods of this kind, for example, in Japanese Patent Laid-Open Nos. 59-129373 and 60-103281, hot air is passed through the upper part of the processing chamber containing the wood and the lower part of the processing chamber. A method for drying wood by passing cold air is proposed, and an apparatus for carrying out this method is also disclosed.However, in such a method, the processing efficiency of wood is low, and in order to improve the processing efficiency, the inside of the processing chamber is When a large amount of wood is loaded, there is a problem that the dryness of the treated wood varies widely and the quality becomes uneven.

As a result of various researches for solving the above problems, the present inventor has invented an improved wood drying apparatus capable of efficiently and uniformly drying a larger amount of wood than the conventional wood drying apparatus. Have applied for a patent (Japanese Patent Application Laid-Open No. 4-
148184). This apparatus includes a wood storage chamber that can be sealed, a combustion gas generation furnace having a combustion air introduction passage, a combustion gas supply passage that leads from the upper part of the furnace to the upper part of the wood storage chamber, and the wood storage chamber. It has a gas discharge passage from the bottom to the chimney and a gas recovery passage from the bottom of the wood containing chamber to the furnace, and a gas flow rate control device is provided in at least one of the gas discharge passage and the gas recovery passage. It is a wood drying device characterized by that.

[0007]

Such a wood dryer has excellent wood drying efficiency. However, when it is attempted to quickly dry wood having a large thickness, even if the sides of the wood are dried, Since it is difficult to dry the product and the product has distortions, it is not efficient because it limits the drying speed. Therefore, the present invention further improves the above-described wood drying apparatus invented by the present inventor (hereinafter, referred to as a prior invention apparatus) so that the drying speed can be increased and the quality is further improved. It is an object of the present invention to provide an improved wood reforming device capable of producing wood.

[0008]

SUMMARY OF THE INVENTION An improved wood reforming apparatus is provided with a sealable wood containing chamber, a combustion gas generating furnace having a combustion air introduction passage, and the wood containing chamber from at least the upper part of the furnace. A combustion gas supply passage leading to the upper part of the wood containing chamber, a gas discharge passage leading from the bottom of the wood containing chamber to the chimney, and a gas recovery passage leading from the bottom of the wood containing chamber to the combustion air introducing passage, It is characterized in that a steam generator is provided in the generation furnace.

The wood reforming apparatus of the present invention has a main structure similar to that of the apparatus of the prior invention, and includes a sealable wood accommodation chamber, a combustion gas generation furnace having a combustion air introduction passage, and an upper part of the furnace. From a combustion gas supply passage leading to the upper part of the wood containing chamber, a gas discharge passage leading from the bottom of the wood containing chamber to the chimney, and a gas recovery passage leading from the bottom of the wood containing chamber to the combustion air introduction passage. It has something in common.

The wood reforming apparatus of the present invention is improved in that a steam generator is newly provided in the same combustion gas generating furnace as in the apparatus of the prior invention.
As such a steam generator, for example, a wet-wall type evaporator or a spray evaporator is used, but as a wet-wall type evaporator, it has a metallic lattice-shaped or a cage-shaped or plate-shaped evaporation surface,
A device configured such that water is poured little by little into this is preferably used.

[0011]

In the wood reforming apparatus of the present invention, when a fuel such as wood chips is burned in the combustion gas generation furnace, the combustion gas containing smoke flows into the upper part of the wood containing chamber through the combustion gas supply passage. The hot combustion gas passes between the woods loaded in the wood storage chamber, flows downward while heating and drying the woods, flows out from the bottom of the wood storage chamber, and is discharged from the chimney through the gas discharge passage. In this way, most of the gas in the timber storage chamber is guided from the bottom of the timber storage chamber to the combustion air introduction passage by the gas recovery passage, mixed with fresh combustion air and returned to the combustion gas generation furnace to generate combustion gas again. It circulates from the furnace to the wood storage chamber, but in the steam generator, steam is generated by the heat of the combustion gas and circulates as hot humid gas.

The high-humidity combustion gas thus circulated is effective for making the temperature distribution in the wood storage chamber uniform,
Due to the high humidity in the combustion gas, desorption of water near the surface of the wood is slowed, and the temperature of the wood rapidly rises to the core. When the temperature inside the wood storage chamber exceeds 100 ° C, the moisture in the wood core is promoted to vaporize and diffuses to the sides. However, since the shrinkage and hardening of the wood side does not occur due to drying, the moisture diffusion is hindered. The moisture is desorbed faster than the case where the high temperature combustion gas of low humidity is circulated.

As the water content of the wood decreases, the moisture content of the wood is reduced to gradually reduce the atmospheric humidity, and dehydration and drying of the core and the side of the wood proceed in parallel. It can be dried uniformly without causing distortion. In addition, volatile components and the like generated when the wood dries are once returned to the combustion gas generation furnace, decomposed and burned, and then discharged from the chimney, so there is little risk of air pollution.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a wood reforming apparatus of the present invention is provided with a wood containing chamber 1 and a combustion gas generating furnace 2 which are adjacent to each other, in which wood to be modified can be loaded and sealed. , Their upper parts communicate with each other through a plurality of combustion gas supply paths 3. Each of these combustion gas supply paths 3 is provided with a gate 31 for adjusting the gas flow rate so that the gas flow in the wood containing chamber 1 can be averaged.
Further, a steam generator 8 formed of an iron grid is attached in the middle of the wall of the combustion gas generation furnace 2, and a tap water supply port 81 from the outside is provided immediately above the steam generator 8. At the bottom of the combustion gas generating furnace 2 is formed a fire chamber 21 in which fuel such as waste wood can be injected and burned, and the combustion air introducing passage 4 is connected to the fire chamber 21. A damper 41 that can limit the amount of intake of outside air is provided at the open end of the combustion air introduction passage 4.

A plurality of gas recovery passages 5 are connected to a plurality of positions on the bottom of the wood containing chamber 1 and communicate with a plurality of positions of the combustion air introduction passage 4, respectively. A damper 51 is provided on each of these gas recovery paths 5. A gas discharge path 6 is connected to the bottom of the wood containing chamber 1 at a position farthest from the combustion gas supply path 3 and communicates with a chimney 7. A damper 61 for adjusting the amount of gas discharged to the chimney 7 is provided in the middle of the gas discharge path 6.

In the wood reforming apparatus constructed as described above, the wood loaded on the truck is carried into the wood storage chamber 1, the door is closed and sealed, and then the wood is put into the combustion gas generating furnace 2. When the fuel such as wood chips is ignited, the combustion gas flows into the wood storage chamber 1 from the upper part of the combustion gas generation furnace 2 through the respective combustion gas supply passages 3. At this time, if the damper 61 is closed, the air in the wood containing chamber 1 is burned from the plurality of gas recovery passages 5 through the combustion air introducing passage 4 as the interior of the wood containing chamber 1 is filled with the high temperature combustion gas. The circulation of the gas is continued until it is sucked into the gas generating furnace 2 and the entire wood containing chamber 1 is filled with the high temperature combustion gas.

In this way, the air in the apparatus is the combustion gas generating furnace 2
At this time, the atmosphere in the wood containing chamber 1 becomes hot as it is converted into high temperature combustion gas, but at this time, water is gradually supplied from the tap water supply port 81 to the steam generator 8 which is heated by contacting with the combustion gas. Then, water vapor is generated and the wood storage chamber 1
The atmosphere inside becomes high humidity at the same time, but the oxygen concentration also decreases and the combustion speed of the fuel in the combustion gas generating furnace 2 slows down, so that the temperature in the wood containing chamber 1 also does not rise. At this time, if the damper 61 is slightly opened to allow a part of the gas in the wood containing chamber 1 to escape to the chimney 7 through the gas discharge path 6,
An amount of fresh air corresponding to the amount of gas discharged is sucked in through the combustion air introducing passage 4, and the combustion speed of the fuel is automatically adjusted so as not to become too slow.

At this time, the dampers 5 of the gas recovery passages 5 are
By adjusting 1 so that the gas in the wood containing chamber 1 is sucked into the combustion air introducing passage 4 on average, the temperature distribution in the wood containing chamber 1 can be further averaged. In this way, in the timber storage chamber 1 filled with a uniform atmosphere of high temperature and high humidity and low oxygen concentration, the loaded timber is dried uniformly, and is efficiently dried, killed by insects, and killed by eggs. Modified wood is produced. Most of the volatile matter generated from the wood during drying is also sucked into the combustion gas generation furnace 2 and decomposed by combustion to circulate in the apparatus, so that environmental pollution due to the gas discharged from the chimney 7 is significantly reduced. .

[0019]

EFFECTS OF THE INVENTION According to the wood reforming apparatus of the present invention, since the wood accommodation chamber is kept in a high temperature and high humidity atmosphere with a uniform low oxygen concentration, drying is promoted, so that not only stable operation but also uniform quality can be achieved. There is an advantage that the modified wood can be economically produced with high efficiency and high yield.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing a configuration of a wood reforming apparatus of the present invention.

[Explanation of Codes] 1 Wood accommodation chamber 2 Combustion gas generation furnace 21 Fire chamber 3 Combustion gas supply path 31 Gate 4 Combustion air introduction path 41 Damper 5 Gas recovery path 51 Damper 6 Gas discharge path 61 Damper 7 Chimney 8 Steam generator 81 Tap water supply port

Claims (2)

[Claims] 1. A hermetically-sealed wood containing chamber, a combustion gas generation furnace having a combustion air introduction passage, a combustion gas supply passage extending from at least an upper part of the furnace to an upper part of the wood containing chamber, and the wood containing chamber. A gas discharge passage leading from the bottom of the wood to the chimney, and a gas recovery passage leading from the bottom of the wood containing chamber to the combustion air introduction passage, and a steam generator provided in the combustion gas generating furnace. Wood drying equipment. 2. The wood drying apparatus according to claim 1, wherein the steam generator is a wet wall type evaporator or a spray evaporator.