Wood single-plate microwave drying device and drying method

A technology of microwave drying and wood veneer, which is applied in the direction of preliminary treatment to promote the drying of solid materials, heating devices, and drying of solid materials. It can solve the problems of unstable drying quality, increased production costs, and difficulty in large-scale promotion, and avoid The effect of excessive gas vapor pressure, reducing energy consumption and cost, and ensuring drying quality

Active Publication Date: 2016-01-27
山东千森木业集团有限公司
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  • Application Information

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Problems solved by technology

[0009] However, due to the high energy consumption of existing wood microwave drying technology, it is difficult to promote on a large scale, especially for the microwave heating time of wood, there is no accurate quantitative method, and it can only be judged based on experience or repeatedly deduced, resulting in heating time much longer than The required heating time is different from the actual heating time and cannot be "quantified", resulting in further increase in production costs and unstable drying quality

Method used

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  • Wood single-plate microwave drying device and drying method

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Effect test

Embodiment 1

[0046] A wood veneer microwave drying device, comprising a microwave heating device 1, a ventilation device 2 for controlling the ventilation rate of the microwave heating device, and a metering device 3 for measuring the power consumption of the microwave heating device, the ventilation device 2 is arranged on the microwave heating device 1 side, the air in the microwave drying device enters the ventilation device through the vent on one side of the microwave heating device 1 and then discharges; in the working state: the metering device records the moisture evaporation of wood as G 水 When the power consumption E of the microwave heating device 1 is used to obtain the microwave wood veneer drying water extraction rate value η 水 .

[0047] Microwave wood drying is the use of high-frequency electromagnetic waves in a closed space (container) to directly radiate "in vivo" heating of wood. Wood drying (wooddrying) refers to the process of removing wood moisture by evaporation or...

Embodiment 2

[0072] 1. Calculation of water extraction rate for microwave wood veneer drying

[0073] ①. Laboratory wood veneer preparation: sample size (length×width×thickness): 200mm×100mm×1.2~1.4mm×n 层数 →②. Wood veneer sample weighing G 初 →Initial moisture content MC of wood veneer 初 Determination→③. Calculate the target moisture content MC 目标 (Process setting value)→④. Calculate the target veneer weight G 目标 →⑤. Calculation of moisture evaporation for microwave wood veneer drying: G 目标水 =G 初 -G 目标 →⑥. Weigh the veneer for the test (the number of layers corresponds to the number of layers in the pilot test and production test, and the range of the number of layers: 1 to 21) →⑦. After weighing, put the veneer into the "Wood Drying Microwave Water Lifting Rate Measuring Device" "→⑧. "Microwave radiation ←→ weighing"→⑨. After repeated many times, the weight reaches G 目标 →⑩.Based on test data: Electric energy consumption E kw·h , Microwave radiation time T min , The actual evaporat...

Embodiment 3

[0078] The difference between this embodiment and Embodiment 1 is that a clamp power meter is further used as a metering device for detecting the power consumption of a microwave oven.

[0079] The optimum microwave radiation time t of the willow determined by the above method and the optimum microwave drying time t of the willow determined by the conventional method 真 The deviation is 1s.

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Abstract

The invention provides a wood single-plate microwave drying device and drying method. The wood single-plate microwave drying device comprises a microwave heating device, a ventilation device controlling the ventilation quantity of the microwave heating device and a metering device metering the electricity consumption of the microwave heating device and is characterized in that the ventilation device is arranged on one side of the microwave heating device, and air in the microwave drying device enters the ventilation device through a ventilation opening in one side of the microwave heating device and is then discharged. In a work state, the metering device records the electricity consumption E of the microwave heating device when the wood water evaporation quantity is G so as to obtain a wood single-plate microwave drying water extracting rate eta. The numerical value of the wood single-plate microwave drying water extracting rate can be measured and calculated. Technical difficulties limiting the microwave wood drying technology for many years can be digitized, and a substantial breakthrough is made in the industrial application of the microwave wood drying technology.

Description

technical field [0001] The invention belongs to the field of wood drying, and relates to a wood veneer microwave drying device and a drying method. Background technique [0002] Microwave (Microwave) usually refers to electromagnetic waves with a wavelength in the range of 0.1 to 1000mm. The frequency range of microwaves is 300MHz to 3000GMHz, and the frequencies of microwaves used for industrial heating are 915MHz and 2450MHz. [0003] Microwave heats up the dielectric material instantaneously, and the temperature rises quickly. On the other hand, the output power of the microwave can be adjusted at any time, and the temperature rise of the medium can be changed without inertia. There is no "waste heat" phenomenon, and the thermal inertia is small, which is very conducive to the realization of automatic control and continuous production. [0004] Microwaves are a form of energy (not heat), but can be converted to heat in a medium. The reaction of materials to microwaves c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F26B1/00F26B3/347F26B23/08F26B25/22
Inventor 李长贵吕雷昌李牧朱文成刘联合杨庆山郭永胜
Owner 山东千森木业集团有限公司
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