JP3309097B2 - Wood reforming equipment - Google Patents

Description

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 cut wood into dry wood having a stable water content in a short period of time.

[0002]

2. Description of the Related Art As-logged wood contains a large amount of water and has insects and its eggs, so it is dried and treated with chemicals to kill insects and eggs. It was usually commercialized as a building material or furniture material. Conventionally, the drying of such wood requires natural drying means, so it is necessary to leave it for a long period of 3 to 5 years while performing transshipment of wood, etc., as well as poor rotation efficiency of funds. There was also a risk of new insect damage.

Therefore, various methods for drying wood in a short period of time have been proposed, for example, a method of drying in a vacuum, a method of sending hot air into a drying chamber containing wood, and the like. However, wood obtained by such a rapid drying method still has defects such as cracks and distortion due to re-absorption of moisture, as in the case of dry wood obtained by the conventional natural drying method.

On the other hand, as a wood drying method for improving such a drawback, 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 the temperature of the combustion gas are determined. A method has been proposed in which drying, insecticide, and egg killing are simultaneously performed by synergistic action with various contained smoke components to omit the chemical treatment and obtain dried wood that is less likely to generate distortion.

As one of such methods, for example, JP-A-59-129373 and JP-A-60-103281 disclose that a hot air is passed through an upper portion of a processing chamber containing wood and a lower portion of the processing chamber. A method of drying wood by passing cold air has been proposed, and an apparatus for carrying out the method has been disclosed.However, such a method has a low processing efficiency of wood, and in order to increase the processing efficiency, a processing chamber is required to be installed. When a large amount of wood is loaded, there is a problem that the dryness of the treated wood varies greatly and the quality becomes uneven.

The present inventor has conducted various studies to solve such a problem, and as a result, has invented an improved wood drying apparatus capable of efficiently and uniformly drying a larger amount of wood than conventional wood drying apparatuses. Has filed a patent application (Japanese Unexamined Patent Publication No.
148184). The apparatus includes a sealable wood storage chamber, a combustion gas generating furnace having a combustion air introduction path, a combustion gas supply path extending from the upper part of the furnace to the upper part of the wood storage chamber, It has a gas discharge path leading from the bottom to the chimney, and a gas recovery path leading from the bottom of the wood storage chamber to the furnace, and a gas flow control device is provided in at least one of the gas discharge path and the gas recovery path. A wood drying apparatus characterized by the following.

[0007]

Such a wood drying apparatus has an excellent wood drying efficiency. However, if a thick wood is to be dried quickly, even if the side of the wood is dried, the center of the wood is dried. Since the drying is difficult to proceed and the product is left with distortion, the drying speed is limited, so that it is not efficient. Therefore, the present invention further improves the above-described wood drying apparatus (hereinafter referred to as the prior invention apparatus) invented by the present inventor, can increase the drying speed, and further improves the quality. It is an object of the present invention to provide an improved wood reformer capable of producing wood.

[0008]

SUMMARY OF THE INVENTION An improved wood reforming apparatus comprises a sealable wood storage chamber, a combustion gas generating furnace having a fire chamber for burning wood chips at the bottom, and a fire gas generation furnace. A connected combustion air introduction passage, a combustion gas supply passage leading from the upper part of the furnace to an upper part of the wood storage chamber, a gas discharge passage leading from the bottom of the wood storage chamber to the chimney, and a bottom part of the wood storage chamber. And a gas recovery passage leading to the combustion air introduction passage, and a high-temperature high temperature containing smoke obtained by providing a steam generator in the combustion gas generation furnace and burning wood chips in the presence of steam. It is characterized in that the combustion gas of humidity is caused to flow into the upper part of the wood storage chamber.

[0009] The wood reforming apparatus of the present invention is similar in main configuration to the preceding apparatus, and has a sealable wood accommodating chamber, a combustion gas generating furnace having a combustion air introduction passage, and an upper part of the furnace. A combustion gas supply path leading from the bottom of the wood storage chamber to the chimney, and a gas recovery path leading from the bottom of the wood storage chamber to the combustion air introduction path. We have in common.

[0010] The wood reforming apparatus of the present invention is improved in that a new steam generator is provided in a combustion gas generating furnace similar to that of the previous apparatus.
As such a water vapor generating device, for example, a wet wall type evaporator or a spray evaporator is used, and the wet wall type evaporator has a metallic grid-like or cage-like or plate-like evaporation surface,
A structure in which water is supplied little by little to this is preferably used.

[0011]

According to the wood reforming apparatus of the present invention, when wood chips are burned in the combustion gas generating furnace in the presence of steam generated by the steam generating apparatus, the combustion gas having a high temperature and high humidity containing a large amount of smoke is efficiently used. The high-temperature, high-humidity combustion gas, which is well generated and contains a large amount of smoke, gently flows into the upper part of the wood storage chamber from the upper part of the combustion gas generator through the combustion gas supply passage leading to the upper part of the wood storage chamber. The high-temperature, high-humidity combustion gas containing a large amount of smoke flows gently between and around the wood loaded in the wood storage room, keeping the wood storage room in a high-temperature, high-humidity, uniform low-oxygen concentration smoke-containing atmosphere. The wood is heated and dried uniformly and then flows out of the bottom of the wood compartment. A part of the combustion gas flowing out of the bottom of the wood storage chamber is discharged from the chimney through the gas discharge passage, but most of the combustion gas is introduced from the bottom of the wood storage chamber through the gas recovery passage through the gas recovery passage. It is led to a path, mixed with fresh combustion air, and supplied again to the combustion gas generating furnace. The combustion gas supplied to the combustion gas generation furnace burns wood chips in the presence of steam, and is circulated again as high-temperature, high-humidity combustion gas containing smoke.

[0012] The circulating "high-temperature and high-humidity combustion gas containing smoke" is effective in making the temperature distribution in the wood accommodating chamber uniform, but on the surface of the wood due to the high humidity in the combustion gas. The desorption of moisture in the near part is slowed down, so the temperature of the wood rises rapidly to the core. When the temperature in the wood accommodating room exceeds 100 ° C., the moisture in the wood core is promoted to be vaporized and diffuses to the sides. However, since the wood sides do not undergo shrinkage hardening due to drying, the diffusion of the moisture is prevented. Is not hindered, and the desorption of moisture is rather faster than in the case of circulating high-temperature combustion gas of low humidity.

As the moisture content of the wood decreases, the amount of water vapor generated is reduced and the atmospheric humidity is gradually reduced, and the dehydration and drying of the core and sides of the wood proceed in parallel. The wood can be dried uniformly without causing distortion and, as a result, without causing cracks. Further, volatile components and the like generated when the wood dries are returned to the combustion gas generating furnace, decomposed and burned, and then released from the chimney, so that there is little risk of air pollution.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a wood reforming apparatus according to the present invention is provided with a wood accommodating chamber 1 in which wood to be dried can be loaded and hermetically sealed and a combustion gas generating furnace 2 provided adjacently. , And their upper portions communicate with each other through a plurality of combustion gas supply paths 3. Each of the combustion gas supply passages 3 is provided with a gate 31 for adjusting a gas flow rate so that the gas flow in the wood storage chamber 1 can be averaged.
A steam generator 8 formed of an iron grid is attached in the middle of the wall side of the combustion gas generating furnace 2, and a tap water supply port 81 from outside is provided directly above the steam generator 8. At the bottom of the combustion gas generating furnace 2, there is formed a fire chamber 21 in which wood chips such as waste wood can be thrown and burned, and the combustion air introduction passage 4 is connected to this. This combustion air introduction passage 4
A damper 41 that can limit the amount of outside air sucked
Is provided.

A plurality of gas recovery passages 5 are connected to a plurality of positions at the bottom of the wood storage chamber 1 and communicate with the plurality of positions of the combustion air introduction passage 4, respectively. Each of the gas recovery paths 5 is provided with a damper 51. A gas discharge passage 6 is connected to the bottom of the wood storage chamber 1 at a position farthest from the combustion gas supply passage 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 configured wood reforming apparatus, the wood loaded on the cart or the like is carried into the wood storage chamber 1 and then the door is closed and sealed.
When the wood chips thrown into the firebox 21 at the bottom of the furnace are ignited, high-temperature and high-humidity combustion gas including smoke is passed from the top of the combustion gas generator 2 through the respective combustion gas supply passages 3 to the wood storage chamber 1.
Flows into the upper part of. At this time, when the damper 61 is closed, as the inside of the wood storage chamber 1 is filled with the high-temperature combustion gas from above, the air in the wood storage chamber 1 flows from the plurality of gas recovery paths 5 through the combustion air introduction path 4. The gas is sucked into the combustion gas generating furnace 2 and the circulation of the gas is continued until the entire interior of the wood accommodating chamber 1 is filled with the high-temperature combustion gas.

In this way, the air in the apparatus is generated by the combustion gas generating furnace 2.
The atmosphere in the wood accommodating chamber 1 becomes high in temperature as the gas is converted into high-temperature combustion gas at this time. At this time, water is supplied little by little from the tap water supply port 81 to the steam generator 8 which is heated in contact with the combustion gas. Then, water vapor is generated and the wood storage room 1
At the same time, the inside atmosphere becomes high in humidity and contains a large amount of smoke. However, since the oxygen concentration is reduced and the burning speed of the fuel in the combustion gas generating furnace 2 is reduced, the temperature in the wood storage chamber 1 is reduced. Also does not rise. At this time, when the damper 61 is slightly opened to allow a part of the gas in the wood accommodating chamber 1 to escape to the chimney 7 through the gas exhaust passage 6, an amount of fresh air corresponding to the amount of discharged gas is introduced into the combustion air. The fuel is sucked through the passage 4 and is automatically adjusted so that the burning rate of the fuel does not become too slow.

At this time, each of the dampers 5 of the gas recovery path 5
By adjusting 1 so that the gas in the wood storage chamber 1 is sucked into the combustion air introduction passage 4 on average, the temperature distribution in the wood storage chamber 1 can be further averaged. Thus, in the wood storage room 1 filled with a smoke-containing atmosphere having a high temperature and a high humidity and a uniform low oxygen concentration, drying of the loaded wood proceeds uniformly, and drying, insecticidal and egg killing are performed efficiently, and the quality is improved. Good dry wood is produced. Most of the volatile components generated from the wood during drying are also sucked into the combustion gas generating furnace 2 and burned and decomposed to circulate in the apparatus. Therefore, environmental pollution due to the gas discharged from the chimney 7 is significantly reduced. .

[0019]

According to the present invention, there is provided a wood reforming apparatus comprising: (a) burning wood chips in a combustion gas generating furnace in the presence of steam generated by a steam generating apparatus; Combustion gas can be generated efficiently, and (b) high-temperature, high-humidity combustion gas containing a large amount of smoke can flow quietly into the upper part of the wood storage room through the combustion gas supply path.
(C) The high-temperature, high-humidity combustion gas containing a large amount of smoke is allowed to flow gently between and around the wood loaded in the wood storage room, and the low-oxygen smoke containing high-temperature, high-humidity, uniform low oxygen concentration in the wood storage room is contained. By keeping the atmosphere, the wood can be heated and dried uniformly, and the smoke can be evenly attached to the wood,
Dry wood of uniform quality without cracks and the like can be economically produced with high efficiency and high yield, and stable wood drying operation can be performed.

[Brief description of the drawings]

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wood storage room 2 Combustion gas generation furnace 21 Firebox 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

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F26B 1/00-25/22 B27K 1/00-9/00

Claims (2)

(57) [Claims] 1. A wood gas storage chamber that can be sealed, a combustion gas generating furnace having a fire chamber formed at the bottom for burning wood chips, a combustion air introduction passage connected to the fire chamber, and an upper part of the furnace. From the combustion gas supply path leading to the upper part of the wood storage chamber, the gas discharge path leading from the bottom of the wood storage chamber to the chimney, and the gas flowing from the bottom of the wood storage chamber to the combustion air introduction path. A recovery path, and a high-temperature high-humidity combustion gas containing smoke obtained by providing a steam generator in the combustion gas generation furnace and burning wood chips in the presence of steam.
A wood reforming apparatus characterized in that it flows into the upper part of the wood. 2. The wood reformer according to claim 1, wherein the steam generator is a wet wall type evaporator or a spray evaporator.