JP3256196B2 - Wood drying method and 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 method and apparatus for drying wood, and more particularly, to a method and apparatus for drying wood utilizing exhaust heat, which can reduce drying costs and construction costs of a drying room.

[0002]

2. Description of the Related Art Conventionally known general methods for drying wood are provided with a drying chamber that can be hermetically sealed. In the drying operation, after loading the wood into the drying chamber, the temperature is raised, dried, conditioned and cooled. This is a method of drying in four steps.

[0003] In the conventional drying method, a method in which the drying treatment is performed at a room temperature in the range of 100 to 200 ° C is called high-temperature drying, and a method in which the drying process is performed in the temperature range of 60 to 80 ° C is called medium-temperature drying. For example, in order to dry wood having a moisture content of 100% to a moisture content of 18%, about 8% is required for high-temperature drying.
Days, and about 20 days for medium temperature drying. Furthermore, since the conventional drying apparatus performs the entire drying process in one room, the drying room requires equipment that can withstand the most severe high temperature and high humidity.

[0004] For this reason, the conventional wood drying method and apparatus have the problems that the running cost for drying is high and the construction cost of the drying room increases.

[0005]

According to the present invention, a drying chamber is divided into two processing chambers, a pre-processing chamber and a post-processing chamber, and a heat source used in the pre-processing chamber is supplied to the post-processing chamber. It is an object of the present invention to provide a method and an apparatus for drying waste heat, which can reduce the cost of drying by reusing the same, and a wooden drying apparatus that can reduce the cost of building a drying room.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a method for increasing the temperature, drying,
A method for drying wood by four steps of humidity control and cooling. The drying chamber is divided into a front processing chamber and a rear processing chamber. In the front processing chamber, the temperature of the room is raised to a required temperature by a heating device. Heating and drying are performed, and in the rear processing chamber, humidity control and cooling processing are performed using the exhaust heat discharged from the front processing chamber as a heat source, and when half of the entire drying process is processed, the front processing is performed. Moving the wood processed in the chamber to the rear processing chamber, removing the wood processed in the rear processing chamber from the drying chamber, and carrying new wood into the front processing chamber. This is a drying method capable of saving energy consumption and reducing drying costs by supplying the heat source used in the above to the rear processing chamber and reusing it.

Further, according to the present invention, the drying chamber is divided into a front processing chamber and a rear processing chamber by a central partition, and a front door and a rear door are provided at a front part of the front processing chamber and a rear part of the rear processing chamber. The central partition is provided with a through-hole communicating the front and rear processing chambers, and the entire periphery of the through-hole is provided with a packing whose free end reaches the inside of the through-hole. A partition plate is provided in the front part, and when one truck is carried into each of the front and rear processing chambers, the partition plate is located in the through hole of the central partition wall, and the packing provided in the part is the partition. The front and rear processing chambers are in close contact with the plate and shut off the front and rear processing chambers. The front processing chamber needs a structure that can withstand high temperature and high humidity, but the rear processing chamber can withstand medium and low temperature conditions. It is a drying device that can reduce the construction cost of the drying room because of its structure. .

In addition, the packing of the present invention has a frame shape when viewed from the front, is fixed to the periphery of the through hole of the central partition by a packing press, and a spring hinge is provided at an appropriate interval in the packing press. There is a feature.

Further, the present invention is characterized in that an auxiliary packing having a frame shape in a front view is provided at a position behind the through hole of the central partition wall in the traveling direction of the bogie.

[0010]

FIG. 1 is a sectional view of the entire drying chamber, and FIG.
Is a cross-sectional view of the central partition of the drying chamber, and FIG. 3 is a front view of the central partition.

In FIG. 1, a drying chamber 1 is divided into a front processing chamber 2 and a rear processing chamber 3 by a central partition 4. A front door 5 is provided at the front of the drying chamber 1, that is, at the front of the front processing chamber 2. A rear door 6 is provided on the back of the rear processing chamber 3 which is the back of the drying chamber 1. The central partition wall 4 is provided with a through hole 7 for communicating the front and rear processing chambers 2 and 3.

A rail 10 is laid on the floor of the drying chamber 1 and external rails 11 are laid before and after the drying chamber 1. A cart 12 loaded with wood to be dried is moved to the drying chamber 1. It can be carried in and out. In addition, 1
Reference numeral 3 denotes wheels for driving the carriage 12.

In an embodiment, the front and rear processing chambers 2,
3 has a size capable of accommodating one truck 12, and the through hole 7 of the central partition 4 has substantially the same size as the opening hole that the front and rear doors 5 and 6 close. I have. The front and rear processing chambers 2, 3 are provided around the through hole 7 of the central partition 4.
Is provided, and the front and rear doors 5 and 6 are provided with door packing devices for sealing each processing chamber.

The door packing devices provided on the front and rear doors 5 and 6 adopt the same structure as the conventional structure, and thus a detailed description is omitted.

Next, the packing device provided in the through hole 7 of the central partition 4 will be described in detail. The packing device is a central partition 4
A packing 20 formed in a frame shape in a front view is fixed on the entire peripheral portion of the through hole 7 and a surface facing the rear processing chamber 3 so that a free end reaches the inside of the through hole 7. Specifically, in this case also, a frame-shaped packing presser 21 is brought into contact with the surface of the packing 20 in a front view, and both are fastened and fixed by bolts 22 or the like.

The packing retainer 21 is divided into two parts along the length, one member 21a is used for fixing the packing 20 to the central partition wall 4, and the other member 21b is mounted near the free end of the packing 20.

Further, in order to urge the free end of the packing 20 toward the inside of the hole 7, two
Hinges 23 at appropriate intervals between the two members 21a and 21b.
2, so that the free end of the packing 20 is urged counterclockwise in FIG.

On the other hand, the carriage 12 is provided with a partition plate 25 large enough to pass through the through-hole 7 at a front portion in the traveling direction of the carriage, and when the carriage 12 is carried into the front processing chamber 2,
The partition plate 25 reaches the inside of the through hole 7 of the central partition wall 4, and at the same time, the free end of the packing 20 closely adheres to the peripheral edge of the partition plate 25, whereby the air in the front and rear processing chambers 2, 3 is shut off. You. The partition plate 25 may be provided at the front part in the traveling direction of the carriage 12, but is provided at the front and rear parts in the embodiment.

Further, since the rail 10 is laid on the floor of the drying chamber 1, a notch 26 is formed in the central partition wall 4 at the place where the rail 10 is laid, and the packing 20 is located at the place where the rail 10 is laid. The front and rear processing chambers 2 and 3 are shut off when the carriage 12 is carried into the front processing chamber 2, and the cut 27 is formed when the carriage 12 passes through the central bulkhead 4. They can be pushed and moved to the rear processing chamber 3.

In addition, the packing 20 is provided in the through hole 7 of the central partition wall 4 on the surface facing forward in the traveling direction of the bogie 12, but in order to enhance the air blocking effect, the surface facing the rear surface in the traveling direction of the bogie. May be provided with an auxiliary packing 30.
In this case, the auxiliary packing 30 has a packing presser 31 but does not have a spring hinge or the like.

In the present invention, the amount of heat exhausted from the front processing chamber 2 is used in the rear processing chamber 3; 40 is an intake port provided in the front processing chamber 2; Reference numeral 42 denotes a supply fan provided to supply exhaust heat to the rear processing chamber 3, and reference numeral 42 denotes an exhaust fan provided in the rear processing chamber 3.
Although not shown, a heat generating device is provided inside the front processing chamber 2, and the temperature of the exhaust heat supplied from the supply fan 41 is efficiently used inside the rear processing chamber 3, also not shown. A heat exchange device is provided for the heat exchange.

In the drawing, reference numeral 50 denotes wood (square lumber) mounted on the cart 12, which is laminated in multiple stages.

Next, the drying operation of the present invention will be specifically described. FIG. 1 shows a state in which carts 12a and 12b carrying wood 50 are loaded into the front and rear processing chambers 2 and 3, at this time, the partition plate 25 of the cart 12 is located inside the through hole 7 of the central partition wall 4. And the packing 20 and the auxiliary packing 3
Numeral 0 is in close contact with the partition plate 25 before and after the bogie to shut off the front and rear processing chambers 2 and 3.

In the front processing chamber 2, the temperature is raised by a heat generator and the temperature is raised and dried. The wood 50 having a moisture content of 100% carried in is maintained at a room temperature of 100 to 120 ° C. for 4 days continuously. Treated and dried to a moisture content of 25%.
In the rear processing chamber 3, humidity control and cooling processing are performed using the heat discharged from the front processing chamber 2 as a heat source. Since the wood 50 carried into the rear processing chamber 3 has been dried in the front processing chamber 2 to a moisture content of 25%, it is continuously treated at room temperature of 40 to 50 ° C. for 4 days and dried to a moisture content of 18%.

During this time, the inside of the front processing chamber 2 is heated to a required temperature by a heat generating device provided therein, and the rear processing chamber 3 uses the supply fan 4
1 and used as heat source. The heat discharged from the front processing chamber 2 introduced into the rear processing chamber 3 is used as humidity for the wood. This humidity is particularly effective in the humidity control of wood. However, a temperature rise is required at the end of the work in the rear processing chamber 3, but the required temperature rise can be measured because the rear processing chamber 3 is provided with a heat exchange device.

When the drying operation is completed, the front door 5 and the rear door 6 are opened, and a new carriage (not shown) loaded with the wood to be dried is kept in the front of the front processing chamber 2. Is carried into the front processing chamber 2 which has been opened. As a result, the truck 12a loaded with the half-processed wood in the front processing chamber 2 is carried into the rear processing chamber 3, and the truck 12b loaded with the dried wood is simultaneously loaded into the rear processing chamber 3 It is carried out from.

The drying process is performed at a high temperature of 100 to 200 ° C. in the front processing chamber 2.
2a is pushed into the rear processing chamber 3 and the front processing chamber 2
Since a new carriage 12c is carried into the front processing chamber, there is no danger even if the door of the front processing chamber 2 maintained at a high temperature is opened.

In the embodiment, if the amount of heat required for the temperature raising and drying processes in the front processing chamber 2 is 60% of the total heat required for all processing operations, the amount of heat required for the rear processing chamber 3 is 40% of the total. %, But new heat energy is not required in the processing step of the rear processing chamber 3.
The amount of heat in the present invention can greatly reduce the amount of heat required by the prior art.

Further, in the embodiment, the equipment of the drying chamber 1 needs to have a structure capable of withstanding a high temperature and a high humidity of about 100 to 200 ° C. in the front processing chamber 2, while having a structure capable of withstanding high temperature and humidity of about 100 to 200 ° C. A structure capable of withstanding the above conditions is sufficient.

[0030]

According to the present invention, the drying chamber is divided into a front processing chamber and a rear processing chamber so that the drying operation performed in each of the steps of raising, drying, humidity control, and cooling can be divided into two steps before and after. The process of raising and drying is performed in the front processing chamber, and the process of humidity control and cooling is performed in the rear processing chamber. The rear processing chamber uses heat discharged from the front processing chamber as heat source. Since it is used, the running cost of the drying operation is reduced, which has the effect of obtaining an energy-saving drying apparatus.

Also, in the present invention, the front processing chamber requires equipment having a structure capable of withstanding high temperature and high humidity, but the rear processing chamber needs to have a structure sufficient to withstand medium to low temperature conditions. This has the effect of reducing equipment costs.

[Brief description of the drawings]

FIG. 1 is a sectional view of the entirety of an assembled drying chamber.

FIG. 2 is a cross-sectional view showing a central partition of a drying chamber.

FIG. 3 is a front view showing a central partition.

[Explanation of symbols]

 Reference Signs List 1 drying chamber 2 front processing chamber 3 rear processing chamber 4 central partition wall 5 front door 6 rear door 7 through hole 10 rail 11 external rail 12 carriage 13 wheels 20 packing 21 packing presser 22 bolt 23 spring hinge 25 partition plate 26 cutout (Central bulkhead) 27 Notch (packing) 30 Auxiliary packing 31 Packing retainer 40 Inlet 41 Supply fan 42 Exhaust fan 50 Wood (square)

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F27K 5/00 F26B 9/06 F26B 21/00

Claims (4)

(57) [Claims] 1. A method for drying wood by four steps of heating, drying, humidity control and cooling, wherein a drying chamber (1) is divided into a front processing chamber (2) and a rear processing chamber (3). Then, in the front processing chamber (2), the interior of the chamber is heated to a required temperature by a heat generating device to perform a temperature raising and drying process, and in the rear processing chamber (3), the discharge is discharged from the front processing chamber (2). The wood treated in the front processing chamber (2) is moved to the rear processing chamber (3) at the time when half of the entire drying processing step is performed by performing humidity control and cooling processing using heat as a heat source, and at the same time, rear processing is performed. A method for drying wood, comprising taking out wood processed in the processing chamber (3) from the drying chamber (1) and carrying new wood into the front processing chamber (2). 2. A drying chamber (1) is divided into a front processing chamber (2) and a rear processing chamber (3) by a central partition (4), and the front and rear processing chambers (2) of the front processing chamber (2) are separated. A front door (5) and a rear door (6) are provided on the back side of 3), and a through hole (7) for communicating the front and rear processing chambers (2, 3) is provided in the central partition wall (4). A packing (20) whose free end reaches the inside of the through-hole (7) is provided at the entire peripheral portion of the through-hole (7), and a partition plate (25) is provided on a front part of a cart carried into the drying chamber (1). When one truck is carried into each of the front and rear processing chambers (2, 3), the partition plate (2) is provided.
5) is located in the through hole (7) of the central partition (4), and the packing (20) provided in this portion is in close contact with the partition plate (25) and the front and rear processing chambers (2, 3). A wood drying device characterized by shutting off air. 3. The packing (20) has a frame shape in a front view, and is fixed to a peripheral portion of the through hole (7) of the central partition (4) by a packing presser (21). 3. The wood drying apparatus according to claim 2, wherein spring hinges (23) are provided at appropriate intervals. 4. An auxiliary packing (30) having a frame shape in front view is provided at a position behind the through hole (7) of the central partition wall (4) in the bogie traveling direction.
Or the wood drying apparatus according to 3.