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A wood drying and thermal modification combined treatment method and device

A technology for wood drying and joint treatment, applied in wood heat treatment, wood drying, wood treatment and other directions, can solve the problems of low work efficiency, high heat modification treatment cost, long treatment time, etc., to improve production efficiency and reduce energy consumption volume and labor intensity, compact structure

Inactive Publication Date: 2017-09-26
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing two-step treatment method of drying and heat treatment has cumbersome process, high labor intensity (requires two stacking and two unstacking), low work efficiency, long processing time and large energy loss (requires two In addition, during the high-temperature heat treatment process of carbonization kiln, the heating medium is generally heat-conducting oil or directly electric heating, and the cost of thermal modification treatment is high

Method used

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  • A wood drying and thermal modification combined treatment method and device
  • A wood drying and thermal modification combined treatment method and device

Examples

Experimental program
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Effect test

Embodiment 1

[0035]A combined drying and thermal modification treatment method for difficult-to-dry sawn timber, comprising the following steps:

[0036] S1. Timber accumulation: choose wet oak sawn timber with a length of 1.0m, a thickness of 22mm, a width of 180mm, and an initial moisture content of about 52%. The height of the pile is 1.2m, the width of the pile is 1.2m, the thickness of the spacer is 20mm, the width of the spacer is 30mm, and the length is 1.3m;

[0037] S2. Wood drying: close the door of the drying kiln body, use moist air as the drying medium, turn on the axial flow fan and circulation fan, open the positive pressure side moisture discharge hole of the axial flow fan, close the negative pressure side moisture discharge hole of the axial flow fan , turn on the pyrolysis gasification heating system to quickly increase the temperature of the drying medium to 40°C, and keep it warm for 1.5 hours to fully heat the difficult-to-dry sawn timber, and then continue to increas...

Embodiment 2

[0043] A combined drying and thermal modification treatment method for easy-drying sawn timber, comprising the following steps:

[0044] S1. Timber stacking: use wet masson pine sawn timber with a length of 2.2m, a thickness of 25mm, a natural width, and an initial moisture content of about 63%, and stack the masson pine sawn timber according to the LY / T1068-2012 standard , the height of the pile is 1.5m, the width of the pile is 1.5m, the thickness of the spacer is 25mm, the width of the spacer is 35mm, and the length is 1.6m;

[0045] S2. Wood drying: close the door of the drying kiln body, open the axial flow fan, circulation fan and pyrolysis gasification heating system, open the positive pressure side moisture discharge hole of the axial flow fan, and close the axial flow fan negative pressure side moisture discharge hole , quickly raise the temperature of the drying medium to 40°C, and keep it warm for 1h to preheat the sawn timber, so that the sawn timber is fully heate...

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Abstract

The invention discloses a wood drying and thermal modification combined treatment method and device. The method includes the steps that wood is stacked in a closed drying kiln, wet air or normal-pressure superheated water vapor is guided into the drying kiln as a drying medium, biomass pyrolysis gas is used as a heating source to heat the drying medium so as to conduct drying treatment on the wood, the temperature of the drying medium is increased to 160 DEG C-220 DEG C after the water content of the wood drops to be within 5%, the wood is subjected to the thermal modification treatment, and then cooled humidifying and balance treatment are conducted on the wood subjected to thermal modification. A ventilation circulating system and a pyrolysis gas heat-supply system of the wood drying and thermal modification combined treatment device both communicate with a wood stacking area. A detection control system is used for detecting the drying and thermal modification parameters of the interior of the drying kiln and is electrically connected with the ventilation circulating system, the pyrolysis gas heat-supply system and a moisture exhaust vent. The wood drying and thermal modification combined treatment method and device have the advantages that the process is simple, the energy consumption and production cost are low, the labor intensity is low, and the production efficiency is high.

Description

technical field [0001] The invention relates to the technical field of wood processing, in particular to a wood drying and thermal modification combined treatment method and device. Background technique [0002] Drying is an important process in wood processing, and the energy consumption of drying accounts for about 40-70% of the total energy consumption of wood processing, and the quality of drying directly determines the utilization rate of wood and the quality of wood products. High-temperature heat treatment is a wood modification technology that has emerged in recent years. Its basic principle is to perform high-temperature heat treatment on wood under the specific conditions of high temperature, anoxic, water vapor (or inert gas, hot oil, etc.), so that the interior of the wood The hemicellulose components in the wood are partially decomposed, nutrients such as starch and sugar react and volatilize, and new chemical bonds are formed inside the wood, so as to achieve t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F26B3/04F26B21/10F26B21/08F26B21/00B27K5/00
CPCB27K5/0085F26B3/04F26B21/001F26B21/08F26B21/10F26B2210/16
Inventor 李贤军吴义强宋保其郝晓峰李新功谢力生程度文牟群英胡进波
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY