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Wood high-temperature high-pressure overheat steam drying method and its drying device

A technology of superheated steam, high temperature and high pressure, applied in wood treatment, wood processing equipment, wood treatment details, etc., can solve the problems of steep moisture content gradient, low equilibrium moisture content, cracking, shrinkage, etc., and achieve gentle moisture content gradient, The effect of low production cost and fast drying speed

Inactive Publication Date: 2008-03-26
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problem that the equilibrium moisture content is relatively low during the high-temperature drying process of the existing wood, the moisture content gradient on the cross-section of the wood is steep, and drying defects such as cracking and shrinkage are easy to be formed, and the existing wood drying method takes a long time and is energy-efficient. The problem of high consumption, the present invention provides a wood high temperature and high pressure superheated steam drying method and its drying device

Method used

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  • Wood high-temperature high-pressure overheat steam drying method and its drying device
  • Wood high-temperature high-pressure overheat steam drying method and its drying device

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specific Embodiment approach 1

[0009] Embodiment 1: The method for drying wood with high temperature and high pressure superheated steam in this embodiment is realized according to the following steps: 1. Put the wood in a high temperature and high pressure superheated steam drying device and close the kettle door; The pressing pressure of the pressing device above the pile is 500~1000kg / m 2 3. Continue to heat the high-temperature saturated steam into superheated steam through the superheated steam generator and pass it into the kettle body of the above drying device to dry the wood; 4. Adjust the temperature of the superheated steam medium by changing the heating power of the superheated steam generator, And keep the temperature of the superheated steam medium in the kettle at 120~180℃. Fifth, adjust the saturation of the superheated steam medium by changing the saturated steam pressure input to the superheated steam generator, and keep the saturation of the superheated steam medium in the kettle at 20~80 ...

specific Embodiment approach 2

[0010] Specific embodiment 2: In this embodiment, in step 2, the pressing pressure of the pressing device above the material stack is 750kg / m 2 . The surface of the dry material is flat and free of defects such as warpage and deformation. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0011] Embodiment 3: In this embodiment, in step 4, the temperature of the superheated steam medium is 160°C. Good drying effect and no defects such as cracking. Other steps are the same as in the first embodiment.

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Abstract

The present invention is high temperature and high pressure steam timber drying process and apparatus. The timber drying process includes the following steps: stacking timber inside the drying apparatus, and drying timber with overheat steam in the pressure of 500-1000 kg / sq m, temperature of 120-180 deg.c, saturation degree of 20-80 % and flow rate of 6-12 m / s. The timber drying apparatus includes one medium temperature and pressure controlling system, one high pressure kettle assembly and one overheat steam generator connected through one pipeline. The present invention has high drying efficiency, low energy consumption, high drying quality, and capacity of greatly raising the size stability, corrosion resistance and weather resistance of timber.

Description

technical field [0001] The invention relates to a wood drying method and a drying device thereof, which are suitable for high temperature and high pressure superheated steam drying of wood, and also suitable for high temperature and high pressure steam heat treatment of wood and degreasing drying of pine wood. Background technique [0002] Wood drying is a very important process in the wood processing process, and it is one of the important ways to improve the utilization rate of wood and save forest resources; and wood drying is the process with the largest energy consumption in the wood processing process, accounting for about 60 to 70% of. Therefore, the drying method and drying quality of the wood have a direct impact on the cost of wood processing. There are many methods of drying wood. As far as conventional drying is concerned, due to the long drying cycle, high energy consumption, high investment in special drying equipment, complex technology, and sometimes prone t...

Claims

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Application Information

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IPC IPC(8): B27K5/04B27K3/08B27K3/10
Inventor 程万里刘一星韩广萍
Owner NORTHEAST FORESTRY UNIVERSITY
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