CN105276926A - Wood single-plate microwave drying device and drying method - Google Patents
Wood single-plate microwave drying device and drying method Download PDFInfo
- Publication number
- CN105276926A CN105276926A CN201510733603.7A CN201510733603A CN105276926A CN 105276926 A CN105276926 A CN 105276926A CN 201510733603 A CN201510733603 A CN 201510733603A CN 105276926 A CN105276926 A CN 105276926A
- Authority
- CN
- China
- Prior art keywords
- microwave
- water
- drying
- timber
- wood
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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
The invention belongs to drying of wood field, relate to a kind of wood single-plate microwave drier and drying means.
Background technology
Microwave (Microwave), typically refers to the electromagnetic wave of wavelength within the scope of 0.1 ~ 1000mm, and the frequency range of microwave is 300MHz ~ 3000GMHz, and the microwave frequency for industry heating is 915MHz and 2450MHz.
Microwave is instantaneous heat temperature raising to dielectric material, and programming rate is fast.On the other hand, the power output of microwave is adjustable at any time, and medium temperature rise can the change thereupon of inertialess, and there is not residual activity phenomenon, thermal inertia is little, is highly advantageous to and realizes automatically controlling and the needs of continuous prodution.
Microwave is a kind of energy (instead of heat) form, but can be converted into heat in media as well.Material can be divided into three kinds of situations to the reaction of microwave: (1) penetrates microwave; (2) microwave reflection; (3) microwave is absorbed.
General in material processing field, handled material is dielectric material mostly, and dielectric material microwave energy absorbing all to some extent usually, and dielectric material and microwave electromagnetic field intercouple, and can form various power dissipation thus reach the object of Conversion of Energy.
Moisture content refers to that in timber, the weight of water accounts for the percentage of ovendriedwood weight.Moisture in timber can be divided into two parts, and a part is present in wood cell cell wall, is called adsorbed water; Another part is present between lumen and space between cells, is called Free water (free water).When adsorbed water reaches capacity and there is no Free water, be called fibre saturation point, the fibre saturated point of timber is variant because of seeds, between 23 ~ 33%.When moisture content is greater than fibre saturated point, moisture is very little on the impact of wood property; When moisture content reduces from fibre saturated point, the physically-based model of timber changes thereupon.Timber can absorb or transpiring moisture in an atmosphere, and under certain humidity and temperature condition, the moisture content when moisture in timber and the moisture in air no longer carry out exchanging and reaches stable state, is called equilibrium moisture content.Wood equilibrium moisture content changes, between 10.0 ~ 18.0% with factors such as area, season and weathers.
The drying of wood is the operation that in woodwork production process, energy consumption is maximum, accounts for 60.0% ~ 70.0% of enterprise's total energy consumption in China.The general objective of the drying of wood is that how continuous exploration accelerates rate of drying under the prerequisite ensureing wood drying quality, reduces energy consumption and drying cost.The fundamental research of home and abroad Wood Drying Technology and the research of utility theory, all round wood drying quality, speed and Cost Problems, seek the optimum organization of association's harmonic balance point of three.China's wood-processing industry ubiquity awareness of saving energy is poor, extensive management, and disposable energy utilization rate only about 30.0%, is 4 ~ 6 times of developed country.
Microwave drying makes dielectric with unseasoned lumber, put with in microwave electromagnetic field, under the effect of the alternating electromagnetic field of billions of times per second, polar water molecules in timber is occurred " polarization ", " orientation rotation " is there is with the frequency of tens times per second, occur between hydrone to rub and heat-dissipating, the moisture in heat wood also makes it evaporation, thus realizes the target of desiccated wood.Microwave drying timber, belong to " in body " heating, wood internal thermograde and moisture gradient " low inside and high outside ", direction is consistent, and this is the difference maximum with conventional drying.So rate of drying is faster than conventional drying speed, and residual stress is little, can keep the natural colored of timber, dry mass is good.
But existing timber microwave drying technology due to energy consumption higher, be difficult to large-scale promotion, particularly for the microwave heating time of timber, nothing quantitative approach accurately, rule of thumb can only judge or repeated multiple times presumption, cause the heat time much larger than the required heat time, and the true heat time there is difference and cannot " quantize ", cause production cost to increase further, and dry mass is unstable.Therefore, propose a kind of effectively for the best heat time quantitative approach of microwave of multiple timber, for reduction heating using microwave energy consumption and cost, promote the universal significant of microwave drying process technology.
Summary of the invention
Microwave timber drying utilizes frequency electromagnetic waves in a confined space (container), carries out direct radiation " in body " heating to timber.Because microwave drying cost is higher, wish in production to improve microwave treatment efficiency to reduce energy consumption, general by the research of microwave drying mechanism or the optimization of microwave drying condition in existing research, obtain corresponding best drying condition, but because the storage requirement, material, the age of tree etc. of timber changes greatly, above-mentioned method is difficult to the timber industry drying requirement of satisfied various material in enormous quantities.In actual timber industry processing procedure, the more dependence micro-judgments of selection of dry stoving process, cannot overcome " virtual moisture content " phenomenon, not only inefficiency, and easily because the unexpected change of weather or material causes drying efficiency and quality to decline to a great extent.For solving the problem, the present invention is according to " Engineering Thermodynamics " principle, take Conversion of Energy as path, under setting up ventilation condition, linear relationship between timber water lift rate and microwave power consumption value, " quantification " that realize the microwave timber drying process time controls, and increases substantially microwave drying efficiency, ensures dry mass and economic benefit.
For achieving the above object, the present invention adopts following technical scheme:
A kind of wood single-plate microwave drier, comprise microwave heating equipment, control the ventilation unit of microwave heating equipment ventilation, the metering device of metering microwave heating equipment power consumption, described ventilation unit is arranged on the side of described microwave heating equipment, and the air in microwave drier is discharged after entering ventilation unit by the ventilating opening of microwave heating equipment side.Time in working order: described metering device record Wood moisture evaporation capacity is G
waterthe power consumption E of Shi Suoshu microwave heating equipment, to obtain microwave timber veneer drying water lift rate value η
water, η
water=G
water/ E.
Preferably, described electric power meter is pincerlike power meter.Accuracy in detection: 0.5 grade, noise has high immunity to external world, and supported data locks.
Preferably, the ventilation unit of described control microwave heating equipment ventilation is axial flow blower.The profile of described axial flow blower is a tubular, for local ventilation, easy for installation, ventilation successful, safety, and cylinder of can giving a dinner for a visitor from afar is kept watch the region delivered to and specify.
With regard to timber method for microwave drying of the present invention, the experimental stage, microwave drying power is 0.7 ~ 0.8KW.With regard to multiple embodiment of the present invention, when microwave power is lower than 0.7KW, drying and dewatering curve is comparatively level and smooth, and drying time is relatively long, is unfavorable for the raising of production efficiency.When microwave power is greater than 0.8KW, wood internal water, because of fast transferring under microwave effect, easily causes because internal-external temperature difference change is too fast that generation table splits phenomenon.When rated power in micro-wave oven is between 0.7 ~ 0.8KW, comparatively energy-conservation, microwave power reaches the fastest of timber stoving requirement, for the best dries flow process; Now, wood internal water is cushioned because of the fast transferring under microwave effect, can not generation table splits phenomenon because internal-external temperature difference change is too fast.
In the process of heating using microwave, due to the significantly evaporation of steam, cause the steam partial pressure in microwave furnace air close to or the saturated vapor pressure (part microwave energy consumes the double evaporation-cooling in steam) that is greater than at this temperature, and then cause measuring microwave timber veneer drying water lift rate value η
watereffectively cannot react the corresponding relation between microwave radiation energy and Wood moisture evaporation, therefore, gas flow rate during microwave treatment must be improved, ensure effective eliminating of boil-off gas, gas flow flux also must adapt with the time of microwave treatment and power simultaneously, avoid, because the heat trnasfer between wood surface and gas and radiation, affecting the treatment effeciency of microwave.The present invention gropes to find by great many of experiments, when microwave drier sidewall evaporated condensation water generates, and the microwave timber veneer drying water lift rate value η of acquisition
waterthe corresponding relation between microwave radiation energy and Wood moisture evaporation can be reacted exactly.
Present invention also offers the method applying above-mentioned wood single-plate microwave drier desiccated wood veneer, comprise pretreatment and produce two stages, first, pretreatment stage: get wood single-plate to be measured, be cut into preliminary dimension, measures its oven dry weight and weight in wet base, calculate just moisture content, under predetermined ventilation condition, microwave drying is to target weight, records the consumption figures of electric energy in this process, tries to achieve veneer lumber water lift rate; Production phase: the water lift rate obtained according to pretreatment stage and the weight in wet base of wood raw material, try to achieve the electricity needed for microwave drying timber; Electricity again needed for the operate power of microwave dryer and above-mentioned microwave drying timber determines best radiated time, adopts above-mentioned best radiated time process this batch of wood raw material.
Said method specifically comprises the steps:
Pretreatment stage:
1) in same batch of timber, carry out grab sample, extract and organize testing sample more, measure the weight in wet base G of first group of testing sample
wetwith oven dry weight G
absolutely, calculate just water content x
2) the weight in wet base G of second group of testing sample is measured
raw, according to first moisture content X.The target weight G determining timber is required according to process conditions
order=g
absolutely(1+x), 0<x<1, calculates the water evaporation quantity G of target sample
water, carry out heating using microwave to second group of testing sample, until reach timber target weight, record power consumption value E, tries to achieve microwave timber veneer drying water lift rate of the trying to achieve value η of second group of testing sample
water=G
water/ E;
Production phase:
3) the weight in wet base G ' of this batch of timber to be measured is measured, according to the best radiated time t of following formulae discovery microwave:
E
consumption=G
water '/ η
water;g
water '=g '-G
order
T=E
consumption/ P
fortune;p
fortune:running of microwave oven power;
4) above-mentioned best microwave irradiation time process this batch timber to be measured is adopted.
Preferably, the moisture content of described timber is less than 35%.In existing microwave drying process of wood, for ensureing economic benefit, entering kiln moisture content and being generally less than 40%.The present invention found through experiments: the moisture content of timber is less than 35% when entering kiln, and energy consumption for drying is minimum, most effective.
In multiple preferred embodiment of the present invention, described predetermined ventilation condition generates for controlling microwave drier sidewall evaporated condensation water.
Preferably, described wood single-plate to be measured and wood raw material keep consistency of thickness, first moisture content consistent.Ensure that timber water lift rate does not change, realize the accurate control of microwave drying.
Corresponding with plywood production technology for ensureing microwave drying timber method of the present invention, preferred dry number of plies scope is: 1 ~ 21 layer, and now, drying process code is safe feasible.It should be noted that, the veneer number of plies 1 ~ 3 layer (within 5mm), suggestion does not adopt microwave drying process.
In drying course, timber measurement expands, there is certain interval each other, under certain ventilation condition, timber stoving efficiency can be ensured not by the impact of the sheet material number of plies, in veneer thickness 10mm (9 layers) ~ 30mm (25 layers) scope, one-time continuous carry out microwave radiation heating can complete whole periodic drying process, reaches dry whole moisture content index request; When veneer thickness is between 30mm (25 layers) ~ 50mm (42 layers), periodic microwave timber veneer drying technology wants the many of complexity, need adopt batch microwave radiant heating pattern.
With regard to timber method for microwave drying of the present invention, pretreatment stage, microwave drying power is 0.7 ~ 0.8KW.
In experiment, adopt said method to dry water song, masson pine and willow, result shows: the drying time of actual drying time and calculating is basically identical, and positive and negative deviation is no more than 5s, substantially increases microwave drying efficiency.
Beneficial effect of the present invention:
1. the present invention devises " microwave timber veneer drying water lift rate determinator ".Can measure and calculate the numerical value of " microwave drying wood single-plate water lift rate ", " difficult point " that restrict microwave timber drying technique for many years can " digitlization ", the commercial Application of microwave timber dry technology is had substantial breakthrough.
2. periodic microwave timber dry technology of the present invention, is applicable to just moisture content less than 35.0% wood single-plate drying.
3. the once veneer weight of " entrucking " i.e. dry " load " in periodic microwave timber veneer drying technique, should with pilot scale or productivity equipment installed capacity " close ".From Technical Economy aspect, " high load with small power " and " low load with strong power " phenomenon can be avoided to occur.
4. the key technology achievement of this item subject study is: periodic microwave timber veneer drying technology has accomplished " quantification ".According to the wood single-plate dry target moisture content technical indicator of setting, calculate heating using microwave radiated time, by controlling the process time " quantification " of microwave drying heating in actual production, achieving effective control of microwave timber drying process, ensure that dry mass.
5. propose first with the relation of power consumption and water evaporation quantity to determine the method for microwave optimization process time, solve existing timber microwave drying technology due to energy consumption higher, for the microwave heating time of timber, cannot the problem of accurate quantitative analysis, improve a kind of effectively for the best heat time quantitative approach of microwave of multiple timber, reduce heating using microwave energy consumption and cost, promote the universal of microwave drying process.
6. in timber microwave treatment, increase exhaust air rate, under avoiding gas vapor to press through the prerequisite of large reduction evaporation efficiency, match with microwave treatment time and power meanwhile, improve the utilization rate of heating using microwave.
7. achieve the accurate control of timber microwave drying time, the drying time of actual drying time and calculating is basically identical, and positive and negative deviation is no more than 5s, substantially increases microwave drying efficiency.
8. this method operating procedure is simple, and accuracy is high, effectively improves microwave efficiency, and suitable for industrial is promoted.
Accompanying drawing explanation
Fig. 1 microwave drier of the present invention, wherein, 1 microwave heating equipment, 2 controls the ventilation unit of microwave heating equipment ventilation, the metering device of 3 metering microwave heating equipment power consumption.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is further illustrated.
Embodiment 1
A kind of wood single-plate microwave drier, comprise microwave heating equipment 1, control the ventilation unit 2 of microwave heating equipment ventilation, the metering device 3 of metering microwave heating equipment power consumption, described ventilation unit 2 is arranged on the side of described microwave heating equipment 1, and the air in microwave drier is discharged after entering ventilation unit by the ventilating opening of microwave heating equipment 1 side; Time in working order: described metering device record Wood moisture evaporation capacity is G
waterthe power consumption E of Shi Suoshu microwave heating equipment 1, to obtain microwave timber veneer drying water lift rate value η
water.
Microwave timber drying utilizes frequency electromagnetic waves in a confined space (container), carries out direct radiation " in body " heating to timber.The drying of wood (wooddrying) refers to the processing procedure getting rid of Wood moisture under heat energy effect with evaporation or boiling mode.This invention, according to " Engineering Thermodynamics " principle, is path with Conversion of Energy, proposes a kind of wood single-plate drying process.Process route is as follows:
Wood single-plate absolute drift (MC
absolutely) measure (with reference to standard GB/T/T1931---2009 carry out), adopt oven drying method.
Calculate veneer examination material oven dry weight G
absolutely:
G
absolutely=G
raw/ (1+MC
absolutely)
G
raw: moist wood or greenwood weight
Setting final absolute drift according to technological requirement is 10%, wood single-plate weight during calculating moisture content 10%:
G
10=G
absolutely(1+10%)
When wood single-plate is dried to absolute drift 10%, transpiring moisture Weight computation G
water:
G
water=G
raw-G
10
The efficiency test of micro-wave oven microwave water lift:
1). test with the civilian micro-wave oven after repacking, repacking: increase plug-in blower fan, strengthens exhaust air rate, is beneficial to the moisture got rid of and evaporate in a large number when unseasoned lumber is subject to carry out microwave radiation heating; Increase " dynamograph ", metering power consumption E.
2). wood single-plate specification: 200mm × 100mm × 1.5mm.Examination material is weighed: G
raw
3). repeat 1.2.3. and calculate G
10
4). open " dynamograph ", examination material weight G
rawput into micro-wave oven, setting: 6 minutes time; Intensity of fire 100%; Each emissive intervals 6 minutes; Within after each radiation 5 minutes, weigh, until reach (or close) G
10weight; Meanwhile, " dynamograph " power consumption numerical value E is recorded.
5). water evaporation quantity calculates (actual is microwave drying water lift amount): G
water=G
raw-G
10.
6). microwave drying process water lift rate η
watercalculate: η
water=G
water/ E
6. microwave irradiation time t calculates:
1). unit of electrical energy consumption calculations: E
consumption=G
water/ η
water
2). micro-wave oven rated power: P
volume
3). microwave irradiation time t calculates: t=E
consumption/ P
volume
4). the process time is determined.
7. summarize.
Process route is as follows: moist wood (greenwood) veneer (G
raw) → moist wood (greenwood) Veneer moisture measures (MC
absolutely) → oven dry weight (G
absolutely) calculate → dry target weight calculating (G
10) → dry water evaporation quantity calculates (G
water) → test determine dry radiated time (t) and consumed power value (E) → test determine dry microwave water lift rate → by energy consumption for drying and testing equipment power calculation radiated time → determine process time → according to determining process time repeating test → combined radiation time, dry target end of a period weight, correction process time → finally determine wood single-plate drying process.
The microwave optimum drying time t of the water song that the best radiated time t of microwave of the water song adopting said method to determine and conventional method are determined
verydeviation is 2s.
Embodiment 2
1. microwave timber veneer drying water lift rate value calculates
1.. laboratory wood single-plate prepares: specimen size (long × wide × thick): 200mm × 100mm × 1.2 ~ 1.4mm × n
the number of plies→ 2.. wood single-plate sample is weighed G
just→ wood single-plate is moisture content MC just
justmeasure → 3.. calculate target moisture content MC
target(process set value) → 4.. calculate target single board weight G
target→ 5.. calculate microwave timber veneer drying water evaporation quantity: G
target water=G
just-G
target→ 6.. test veneer is weighed, and (number of plies and pilot scale, the industrial experimentation number of plies are corresponding, 1 ~ 21) → 7. number of plies scope:. after weighing, veneer puts into " drying of wood microwave water lift rate determinator " → 8.. " microwave ← → weigh " → 9.. after repeatedly repeating, weight reaches G
target→ 10.. according to test data: electric energy energy consumption E
kwh, microwave irradiation time T
min, dried single board moisture actual evaporation G
actual water, calculate microwave timber veneer drying water lift rate value.
2. periodic microwave timber veneer drying production technology
1. Operational preparation, veneer book size (long × wide × thick): 1250mm × 900mm × 1.2 ~ 1.4mm; Veneer is weighed G
just(multilayer, number of plies scope: 1 ~ 21) → and 2. according to Product Process requirement, setting target moisture content MC
target→ 3. calculate dry target single board weight G
target→ 4. calculate microwave timber veneer drying water evaporation quantity: G
target water=G
just-G
target→ 5. foundation: " microwave timber veneer drying water lift rate value ", equipment installed capacity, dry water evaporation quantity: G
target water, calculate microwave process time → be 6. ready to veneer to send in microwave timber drying equipment → 7. by the microwave irradiation time calculated; carry out time setting → 8. to microwave dryer to start shooting → 9. carry out microwave timber veneer drying → 10. shut down by the setting working time; be cooled to room temperature, weigh and (reach G
target), terminate.
The microwave optimum drying time t of the masson pine that the best radiated time t of microwave of the masson pine adopting said method to determine and conventional method are determined
verydeviation is 4s.
Embodiment 3
The present embodiment difference from Example 1 is, adopts pincerlike power meter as the metering device detecting micro-wave oven power consumption further.
The microwave optimum drying time t of the willow that the best radiated time t of microwave of the willow adopting said method to determine and conventional method are determined
verydeviation is 1s.
Embodiment 4
The present embodiment difference from Example 1 is, adopts axial flow blower to control the blower fan of micro-wave oven exhaust air rate further.
The microwave optimum drying time t of the eucalyptus that the best radiated time t of microwave of the eucalyptus adopting said method to determine and conventional method are determined
verydeviation is 1s.
Embodiment 5
The present embodiment difference from Example 1 is, wood single-plate microwave drier described further runs under the following conditions.In microwave heating process, rated power 0.7-0.8KW in described micro-wave oven, exhaust air rate is to ensure that in micro-wave oven, evaporated condensation water is advisable.
Embodiment 6
This invention device:
1. component devices: 1. civilian micro-wave oven; 2. pincerlike power meter; 3. axial flow blower; 4. industrial electronic balance.
2. operation principle: civilian micro-wave oven, pincerlike power meter, axial flow blower, assembles in accordance with " electrical engineering circuit principle ".Industrial electronic balance is used alone.
1. by controlling the micro-wave oven working time (microwave irradiation time); 2. (UT240 series) pincerlike electric energy power meter (trouble free service can be guaranteed) is used, metering micro-wave oven electric energy energy consumption numerical value; 3. use electronic balance, sample is carried out to drying is forward and backward weighs, calculate the water evaporation quantity of microwave timber drying; 4. according to test data: microwave irradiation time (minute), power consumption (kilowatt hour), water evaporation quantity (kilogram), the dry water lift rate of microwave timber [kilogram/(kilowatt hour)] is calculated; 5. according to the dry water lift rate of microwave timber [kilogram/(kilowatt hour)], microwave rate power (kilowatt), drying of wood water evaporation quantity (kilogram), known weight (kilogram) or the dry radiated time of volume (cubic meter) microwave timber is calculated.
3. microwave timber dry water lift rate determinator work structuring schematic diagram:
1. power supply---→ pincerlike power meter---→ micro-wave oven (plug-in axial flow blower)
2. industrial electronic balance
4. microwave timber dry water lift rate determinator principle schematic:
1. material just measurement of water-content coefficient is tried
2. industrial electronic balance, the drying of examination material is forward and backward weighs
3. power supply---→ power measurement---→ micro-wave oven (load, plug-in forced ventilation)
4. the whole measurement of water-content coefficient of material is tried
5. the dry water lift rate of microwave timber calculates
Although be described the specific embodiment of the present invention above-mentioned, not limiting the scope of the invention, one of ordinary skill in the art should be understood that on the basis of technical scheme of the present invention, and those skilled in the art do not need to pay creativeness.
Claims (10)
1. a wood single-plate microwave drier, comprise microwave heating equipment, control the ventilation unit of microwave heating equipment ventilation, the metering device of metering microwave heating equipment power consumption, it is characterized in that, described ventilation unit is arranged on the side of described microwave heating equipment, and the air in microwave drier is discharged after entering ventilation unit by the ventilating opening of microwave heating equipment side; Time in working order: described metering device record Wood moisture evaporation capacity is G
waterthe power consumption E of Shi Suoshu microwave heating equipment, to obtain microwave timber veneer drying water lift rate value η
water, η
water=G
water/ E.
2. device as claimed in claim 1, it is characterized in that, the metering device of described metering microwave heating equipment power consumption is pincerlike power meter.
3. device as claimed in claim 1, it is characterized in that, the ventilation unit of described control microwave heating equipment ventilation is axial flow blower.
4. device as claimed in claim 1, is characterized in that, the rated power 0.7-0.8KW of described microwave heating equipment.
5. device as claimed in claim 1, is characterized in that, in described microwave heating process, controls evaporated condensation water in microwave heating equipment and generates.
6. adopt a method for the arbitrary described device desiccated wood veneer of claim 1-5, it is characterized in that, comprise pretreatment and produce two stages; First, pretreatment stage: get wood single-plate to be measured, be cut into preliminary dimension, measure its oven dry weight and weight in wet base, calculate just moisture content, under predetermined ventilation condition, microwave drying is to target weight, record the consumption figures of electric energy in this process, try to achieve veneer lumber water lift rate; Production phase: the water lift rate obtained according to pretreatment stage and the weight in wet base of wood raw material, try to achieve the electricity needed for microwave drying timber; Electricity again needed for the operate power of microwave dryer and above-mentioned microwave drying timber determines best radiated time, adopts above-mentioned best radiated time process this batch of wood raw material.
7. method as claimed in claim 6, is characterized in that, comprise the steps:
Pretreatment stage:
1) in same batch of timber, carry out grab sample, extract and organize testing sample more, measure the weight in wet base G of first group of testing sample
wetwith oven dry weight G
absolutely, calculate just water content x;
2) the weight in wet base G of second group of testing sample is measured
raw, require according to first moisture content X and process conditions the target weight G determining timber
order=g
absolutely(1+x), 0<x<1, calculates the water evaporation quantity G of target sample
water, carry out heating using microwave to second group of testing sample, until reach timber target weight, record power consumption value E, tries to achieve the veneer drying water lift rate value η of second group of testing sample
water=G
water/ E;
Production phase:
3) the weight in wet base G ' of this batch of timber to be measured is measured, according to the best radiated time t of following formulae discovery microwave:
E
consumption=G
water '/ η
water;g
water '=g '-G
order
T=E
consumption/ P
fortune;p
fortune:microwave dryer operate power;
4) above-mentioned best microwave irradiation time process this batch timber to be measured is adopted.
8. the method for claim 1, is characterized in that, the moisture content of described wood raw material is less than 35%.
9. the method for claim 1, is characterized in that, step 2) in, described predetermined ventilation condition generates for controlling microwave drier sidewall evaporated condensation water.
10. the method for claim 1, is characterized in that, step 2) in, described wood single-plate to be measured and the consistency of thickness of wood raw material, first moisture content are consistent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510733603.7A CN105276926B (en) | 2015-11-02 | 2015-11-02 | Microwave drying device and drying method for wood veneer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510733603.7A CN105276926B (en) | 2015-11-02 | 2015-11-02 | Microwave drying device and drying method for wood veneer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105276926A true CN105276926A (en) | 2016-01-27 |
| CN105276926B CN105276926B (en) | 2020-05-08 |
Family
ID=55146376
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510733603.7A Active CN105276926B (en) | 2015-11-02 | 2015-11-02 | Microwave drying device and drying method for wood veneer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105276926B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108802352A (en) * | 2017-07-28 | 2018-11-13 | 北京林业大学 | Measurement of water-content coefficient method and method for drying wood in timber drying |
| CN109237868A (en) * | 2018-08-22 | 2019-01-18 | 北京交通大学 | A kind of drying means and system of radioactive waste |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1567559A (en) * | 1924-05-24 | 1925-12-29 | Welch John Berchmans | Drying wood, lumber, and the like |
| CN1201515A (en) * | 1995-09-15 | 1998-12-09 | 微波干燥有限公司 | Wood drying apparatus and method thereof |
| JPH11257850A (en) * | 1998-03-10 | 1999-09-24 | Nara Prefecture | Method and apparatus for dielectric heating |
| CN102052823A (en) * | 2009-11-06 | 2011-05-11 | 北京石油化工学院 | Solar heat pump microwave drying system |
| CN202267334U (en) * | 2011-08-25 | 2012-06-06 | 四川中测量仪科技有限公司 | Microwave drying device |
| CN203163423U (en) * | 2013-03-29 | 2013-08-28 | 刘联合 | Timber microwave dryer |
| CN204574735U (en) * | 2014-10-14 | 2015-08-19 | 浙江沃家家具有限公司 | Microwave timber drying device |
-
2015
- 2015-11-02 CN CN201510733603.7A patent/CN105276926B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1567559A (en) * | 1924-05-24 | 1925-12-29 | Welch John Berchmans | Drying wood, lumber, and the like |
| CN1201515A (en) * | 1995-09-15 | 1998-12-09 | 微波干燥有限公司 | Wood drying apparatus and method thereof |
| JPH11257850A (en) * | 1998-03-10 | 1999-09-24 | Nara Prefecture | Method and apparatus for dielectric heating |
| CN102052823A (en) * | 2009-11-06 | 2011-05-11 | 北京石油化工学院 | Solar heat pump microwave drying system |
| CN202267334U (en) * | 2011-08-25 | 2012-06-06 | 四川中测量仪科技有限公司 | Microwave drying device |
| CN203163423U (en) * | 2013-03-29 | 2013-08-28 | 刘联合 | Timber microwave dryer |
| CN204574735U (en) * | 2014-10-14 | 2015-08-19 | 浙江沃家家具有限公司 | Microwave timber drying device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108802352A (en) * | 2017-07-28 | 2018-11-13 | 北京林业大学 | Measurement of water-content coefficient method and method for drying wood in timber drying |
| CN109237868A (en) * | 2018-08-22 | 2019-01-18 | 北京交通大学 | A kind of drying means and system of radioactive waste |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105276926B (en) | 2020-05-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105333695A (en) | Microwave drying method of wood veneers | |
| CN101403672B (en) | Measurement method and apparatus for fast detection of textile moisture content | |
| Zhou et al. | Measurements of thermal and dielectric properties of medium density fiberboard with different moisture contents | |
| Minea | Efficient energy recovery with wood drying heat pumps | |
| CN105783427A (en) | Microwave vacuum drying method achieving staging control | |
| CN105276926A (en) | Wood single-plate microwave drying device and drying method | |
| CN106950146A (en) | Soil's water content Quick testing instrument and assay method | |
| Liu et al. | Characteristics of commercial-scale Radio-frequency/vacuum (RF/V) drying for hardwood lumber | |
| Kowalski et al. | Intermittent drying: energy expenditure and product quality | |
| He et al. | Modeling and simulation of heat-mass transfer and its application in wood thermal modification | |
| CN203929556U (en) | A kind of far infrared drying drimeter | |
| CN201673085U (en) | Quick energy-saving grain oven capable of controlling sample moisture content at drying terminals | |
| Shane Clements et al. | Study of heat pump assisted microwave drying | |
| Sun et al. | Heat and mass transfer law during microwave vacuum drying of rice | |
| Perré et al. | Energy consumption in the convective drying of timber analyzed by a multiscale computational model | |
| CN102252894A (en) | Fast energy-saving grain baking oven capable of controlling sample water content at drying end point | |
| Ahn et al. | Experimental study on drying time and energy consumption of a vented dryer | |
| Chi et al. | Energy and quality analysis of forced convection air-energy assisted solar timber drying | |
| Song et al. | Experimental research of grape drying using solar dryer with latent heat storage system | |
| CN203224122U (en) | Intelligent drying oven allowing heating media to be selected | |
| Marchevsky et al. | Paper drying process for corrugation (fluting) using radiant energy | |
| CN204757561U (en) | Furniture stuff vacuum drying device | |
| CN104006638B (en) | Be applicable to the hot air combined drying experimental device of microwave fixed bed of on-line analysis | |
| Babych et al. | Results of experimental researches into process of oak veneer drying in the solar dryer | |
| Cech et al. | Dehumidification drying of spruce studs |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 250014 Ji'nan Province, Lixia District, Shandong Province Cultural Road, No. 42 Applicant after: Shangdong Academy of Forestry Applicant after: Shandong fortune Wood Industry Group Co., Ltd. Address before: 250014 Ji'nan Province, Lixia District, Shandong Province Cultural Road, No. 42 Applicant before: Shangdong Academy of Forestry Applicant before: SHANDONG QIANSEN WOOD INDUSTRY CO., LTD. |
|
| COR | Change of bibliographic data | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |