Wood rapid-drying method

A wood drying and fast drying technology, applied in drying solid materials, heating to dry solid materials, drying, etc., can solve the problems of slow drying speed, increased energy consumption, large power consumption, etc., to speed up drying speed and save energy energy effect

Inactive Publication Date: 2006-08-09
张云辉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a long drying time will inevitably increase energy consumption. At present, most wood product enterprises consume 60-70% of the power consumption for wood drying. This slow drying speed and large The power consumption is difficult to overcome by the traditional drying process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: Put 50mm thick oak wood (with a density of about 0.7 g / cm 3 ) Is placed in a wood drying chamber, the ratio of the cross-sectional area of ​​the inlet and exhaust ducts in the wood drying chamber to the total volume of the chamber is 0.01. Close the intake and exhaust ducts of the wood drying room, turn on the fan and heater in the wood drying room, and at the same time spray steam into the wood drying room at a pressure of 0.5 MPa through the steam jet pipe to make the steam in the wood drying room reach a saturated state . Raise the wood drying chamber from 30°C to 80°C within 9-10 hours, maintain the temperature of the wood drying chamber at 80°C and keep it warm for 7 hours, then turn off the heater of the wood drying chamber and open the inlet and exhaust ducts , Within 4 hours, the temperature of the wood drying chamber is rapidly reduced by 40℃~48℃, and then the intake and exhaust ducts are closed. Immediately afterwards, repeat the above rapid heating, he...

Embodiment 2

[0022] Example 2: The 30mm thick Catalpa wood (with a density of about 0.5 g / cm 3 ) Is placed in a wood drying chamber, the ratio of the cross-sectional area of ​​the inlet and exhaust ducts in the wood drying chamber to the total volume of the chamber is 0.01. Close the intake and exhaust ducts of the wood drying room, turn on the fan and heater in the wood drying room, and at the same time spray steam into the wood drying room at a pressure of 0.5 MPa through the steam jet pipe to make the steam in the wood drying room reach a saturated state . Make the wood drying chamber rise from 30°C to 90°C within 4 to 5 hours, keep the wood drying chamber at a temperature of 90°C and keep it warm for 4 hours, then turn off the heater of the wood drying chamber and open the inlet and exhaust ducts , In 2.5 hours, the temperature of the wood drying chamber is rapidly reduced by 30°C to 40°C, and then the inlet and exhaust ducts are closed. Immediately afterwards, the above-mentioned rapid he...

Embodiment 3

[0023] Example three: the 70mm thick pine wood (with a density of about 0.3 g / cm 3 ) Is placed in a wood drying chamber, the ratio of the cross-sectional area of ​​the inlet and exhaust ducts in the wood drying chamber to the total volume of the chamber is 0.01. Close the intake and exhaust ducts of the wood drying room, turn on the fan and heater in the wood drying room, and at the same time spray steam into the wood drying room at a pressure of 0.5 MPa through the steam jet pipe to make the steam in the wood drying room reach a saturated state . Raise the wood drying chamber from 30°C to 95°C in 9-10 hours, maintain the temperature of the wood drying chamber at 95°C and keep it warm for 8 hours, then turn off the heater of the wood drying chamber and open the inlet and exhaust ducts , In 5 hours, the temperature of the wood drying chamber is rapidly reduced by 47℃~56℃, and then the intake and exhaust ducts are closed. Immediately afterwards, the above-mentioned rapid heating, he...

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PUM

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Abstract

Present invention refers to timber quick drying method. It contains 1, putting to be processed timber in timber drying chamber, heating from 30 degree centigrade to 70-98 degree centigrade within 4 to 10 hr and making timber drying vapour being saturated state, 2, keeping temperature for a period, holding time scaling up according to timber thickness, holding time hrs being equal to timber thickness cms, 3, fast reducing timber drying chamber temperature in a period according to timber thickness, 4, repeating step 1-3 by several time, wherein each time the timber heating time being 10-50 minutes, and removing filling saturated vapour process to reduce timber moisture content to demand value. Said invention has equal moisture content gradient and temperature gradient and saves energy source

Description

Technical field [0001] The invention relates to a wood processing method, in particular to a wood rapid drying method. Background technique [0002] Wood needs to go through a pre-treatment process before use, and drying is an important link. Under the premise of ensuring the quality of wood drying, speeding up the drying speed and shortening the drying time in order to achieve the purpose of energy saving and high efficiency has been a long-term goal pursued by people. [0003] At present, traditional steam drying chambers are used at home and abroad to dry wood, mainly using the principle of moisture conduction, that is, the principle of moisture content gradient. Specifically, the moisture in the wood tends to move from the part with high moisture content to the part with low moisture content. Move, and the heat and moisture conduction characteristics of water in wood, that is, the principle of temperature gradient has not been used. The so-called temperature gradient principl...

Claims

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Application Information

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IPC IPC(8): F26B3/04
Inventor 张云辉
Owner 张云辉
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