Method for producing charred wood by heat treatment

A production method and wood technology, applied in wood treatment, wood processing equipment, wood treatment details, etc., can solve the problem of long treatment cycle, large difference in carbonization degree, and failure to fundamentally solve the weather resistance, corrosion resistance and dimensional stability of wood In order to achieve the effects of reducing energy consumption, reducing losses, industrialization and high operability

Inactive Publication Date: 2010-05-26
ZHEJIANG FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Chinese patent document CN1454758A patent discloses "the process of roasting and decaling on the surface of wood and its products", which is a method of carbonizing the surface of the wood directly by spraying and roasting the wood surface with an open flame. This method only carbonizes the surface of the product. There is a large difference in the degree of carbonization inside and outside, and the carbonization uniformity of the surface is also poor due to inconsistent carbonization time and strength, and the problems of weather resistance, corrosion resistance, and dimensional stability of wood have not been fundamentally solved.
However, this method does not clarify the initial moisture content of wood. If it is used to treat wet thick boards or hard broad-leaved materials, it will easily cause surface hardening and cause drying defects such as internal cracks. If it is used to treat dried boards, there will be problems The cycle is too long; at the same time, there is no clear value and control of wet bulb temperature or relative humidity in the process of carbonizing wet wood in this process, which is difficult to guide actual production; moreover, the maximum temperature of this method is 240 ° C, and the wood will be damaged due to If the carbonization temperature is too high and the strength drops too much, it will affect the use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1. The production method of carbonized iron hematoxylin in this example is:

[0020] 1) Preparation stage: stack a batch of iron hematoxylin with a length of 900mm, a width of 150mm, a thickness of 30mm, and a moisture content of about 12% according to the conventional drying method, put them into the carbonization kiln, close the door of the carbonization kiln and the inlet and outlet breath. When stacking and entering the kiln, the material with dark color should be placed in the area with low temperature in the carbonization kiln, and the material with light color should be placed in the area with high temperature.

[0021] 2) Preheating stage: The temperature of the medium in the carbonization kiln is rapidly raised to 50°C in about 1 hour.

[0022] 3) Heating stage: Use the hot oil heating system to generate the heat required for heat treatment, and indirectly heat the air in the kiln through the radiator in the carbonization kiln, so that the temperature...

Embodiment 2

[0025] Example 2. The production method of this example carbonized Fraxinus ash is as follows:

[0026] 1) Preparation stage: stack a batch of Mandshurica mandshurica with a length of 900mm, a width of 150mm, a thickness of 20mm, and a moisture content of about 10% according to the conventional drying method, put them into the carbonization kiln, close the door of the carbonization kiln and the inlet and outlet breath. When stacking and entering the kiln, the material with dark color should be placed in the area with low temperature in the carbonization kiln, and the material with light color should be placed in the area with high temperature.

[0027] 2) Preheating stage: The temperature of the medium in the carbonization kiln is rapidly raised to 60°C in about 1 hour.

[0028] 3) Heating stage: use the hot oil heating system to generate the heat required for heat treatment, and indirectly heat the air in the kiln through the radiator in the carbonization kiln, so that the ...

Embodiment 3

[0031] Example 3. The production method of carbonized fir in this example is:

[0032] 1) Preparatory stage: stack a batch of air-dried fir with a length of 1200mm, a width of 100mm, a thickness of 30mm, and a moisture content of about 16% according to the conventional drying method, put them into the carbonization kiln, close the door of the carbonization kiln and the intake and exhaust mouth. When stacking and entering the kiln, the material with dark color should be placed in the area with low temperature in the carbonization kiln, and the material with light color should be placed in the area with high temperature.

[0033] 2) Pre-drying stage: The temperature of the medium in the carbonization kiln is rapidly raised to 100°C in about 2 hours, and the wet bulb temperature is controlled at 85°C. It takes about 4 to 10 hours to perform conventional drying on Chinese fir.

[0034] 3) Heating stage: When the moisture content is less than 12%, the temperature is raised to 130...

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PUM

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Abstract

The invention relates to a preparation method of heat-treatment charred wood. It aims at providing the charred wood with short treatment cycle, small wood strength loss, industrialized and high maneuverability. It contains stages of preparing, preheating, heating, insulation and cooling. In the heating stage, heat the medium in the stove to 95-105 C degree with the speed of 10-18 C degree / h. Then, heat the materials to 120-130 C degree with the speed of 3-8 / C degree h for high temperature drying and reduce the inner moisture content of the woods to nearly 0. Finally, heat them to 185-220 C degree with the speed of 12-20 C degree / h. The intermittent steam-jet method is adopted to complete steam-jet treatment during the heating.

Description

technical field [0001] The invention relates to a wood heat treatment method, which is a treatment method for incomplete carbonization of wood, and belongs to the field of wood science and technology. technical background [0002] During the use of wood, due to changes in the environment, it is easy to warp, deform, rot, and mold. Over the years, many researchers have devoted themselves to improving the dimensional stability, decay resistance and mildew resistance of wood. However, methods such as resin impregnation treatment, acid and alcohol impregnation treatment, polyethylene glycol (PEG) impregnation treatment, formaldehyde treatment, adding water repellent and other chemical agents are often used. Chemical treatment has a greater adverse impact on the environment; paint treatment methods It is non-permanent. Once the surface of the board is damaged, the waterproof effect will decrease; metallization and ceramic treatment will lose the naturalness of wood. However, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B27K5/00B27M1/06
Inventor 鲍滨福李延军张齐生伊松林杜春贵
Owner ZHEJIANG FORESTRY UNIVERSITY
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