CN101561216B - Method and system for drying wood - Google Patents

Method and system for drying wood Download PDF

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Publication number
CN101561216B
CN101561216B CN200910084710A CN200910084710A CN101561216B CN 101561216 B CN101561216 B CN 101561216B CN 200910084710 A CN200910084710 A CN 200910084710A CN 200910084710 A CN200910084710 A CN 200910084710A CN 101561216 B CN101561216 B CN 101561216B
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China
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gas
dry kiln
humidity
outlet
control
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CN200910084710A
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Chinese (zh)
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CN101561216A (en
Inventor
周玉成
候晓鹏
张星梅
匙璟青
闫承林
陈冀阳
安源
徐佳鹤
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周玉成
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Abstract

The invention discloses a system for drying wood, which comprises a drying kiln, a humidity generator, a heat energy recoverer, a filter and a control system, wherein the drying kiln is provided with a gas inlet and a gas outlet; high-temperature waste gas discharged out of the gas outlet of the drying kiln is filtered by the filter, then is input to the heat energy recoverer, and is discharged out after performing heat exchange with low temperature gas from the humidity generator in the heat energy recoverer, and the heated low temperature gas output by the heat energy recoverer is sent into the gas inlet of the drying kiln through a pipeline; and the control system controls the work of the drying kiln, and controls the humidity of the low temperature gas output by the humidity generator according to the temperature, the humidity and the moisture content of the wood to be controlled in the drying kiln so as to control the humidity of the gas input in the drying kiln. By setting the humidity generator and the heat energy recoverer, the system optimizes the drying quality of the wood and minimizes the energy consumption; and simultaneously, because the working gas is used circularly, the waste gas is prevented from being discharged to the atmosphere to pollute the environment.

Description

A kind of method for drying wood and system

Technical field

The invention belongs to drying of wood field, especially relate to a kind of energy-saving and environmental protection, efficient intelligent method for drying wood and system.

Background technology

The drying of wood is important step and the indispensable operation in the Wood Processing, is the key technology that guarantees the timber-work quality, is the important technique measure of rationally, efficiently utilizing timber.Timber will be utilized, and at first will carry out dried.Dried timber product size ability stable and the antibiotic insect pest of timber all increases, and the excellent specific property of timber can be embodied fully.The drying of wood all has great importance to Wood Processing, use, transportation and preservation.

Existing method for drying wood roughly is divided into: conventional drying, dielectric drying, vacuum drying.Conventional drying is the most general a kind of of present domestic and international application, mainly is because advantages such as device price economy, drying cost are cheap, easy operations, the extremely favor of wood processing enterprise, and this drying mode has accounted for more than 90% of China's wood working industry.Dielectric drying and vacuum drying are on the basis of conventional drying, to grow up, and it is good to have a dry mass, advantage such as speed is fast.But this device costs an arm and a leg, dry volume is little, is not suitable for large-scale production, only limits to the precious assortment of small batch.

Though but select which kind of drying mode, and all to consume a large amount of energy, according to research, the energy that the existing drying of wood is consumed accounts for more than 70% of whole wood working industry energy consumption; Meanwhile, timber will discharge a large amount of waste gas in dry run, pollute to atmosphere thus; Therefore, each state is all at drying process, the method and apparatus of efficient, energy-conservation and environmental protection of research timber.

Summary of the invention

The objective of the invention is provides a kind of energy-saving and environmental protection, efficient, the intelligent method for drying wood of controlling to the problem that prior art exists; A kind of system of this method of application also is provided simultaneously; System of the present invention can realize the Based Intelligent Control to the whole process of the drying of wood, and according to measuring and calculating, it is energy-conservation more than 23% to compare existing conventional drying method; Dry mass can be suitable with vacuum drying and dielectric drying, and be suitable for desiccated wood in enormous quantities.

For realizing above-mentioned purpose, technical scheme of the present invention is following:

A kind of drying of wood system comprises dry kiln, humidity generator, thermal energy recoverer, filter, control system, has inlet, outlet on the dry kiln; The high-temp waste gas that discharge the dry kiln gas outlet is the input thermal energy recoverer after filter filters; The cryogenic gas that in thermal energy recoverer, transports with humidity generator carries out discharging after the heat exchange, and the cryogenic gas after being heated of thermal energy recoverer output is sent into the dry kiln air inlet through pipeline; The work of said control system control dry kiln, and the humidity of the moisture content controlled humidity cryogenic gas that generator is exported that will control according to the temperature in the dry kiln, humidity and institute, with realization to importing the control of dry kiln gas humidity.

Further, the inlet, outlet place of said dry kiln also is respectively arranged with valve, and said control system controls the open degree of dry kiln inlet, outlet through this valve, realizes the control to turnover dry kiln gas flow.

Further; Import said humidity generator as source of the gas through pipeline from the said dry kiln waste gas that said thermal energy recoverer is discharged; After waste gas is manufactured the required moisture of system by humidity generator; After the thermal energy recoverer heating, sent back in the dry kiln once more and done work, formed the circulation of whole drying of wood system works gas thus.

Further; Said thermal energy recoverer is made up of the heat exchanging pipe that is provided with in housing and the inner chamber thereof; Housing is provided with two pairs of air inlet/outlets, and wherein a pair of is the air inlet/outlet of said heat exchanging pipe, and this is used for the turnover of said cryogenic gas to air inlet/outlet; Another is to air inlet/outlet and housing intracavity inter-connection, and this is used for the turnover of said dry kiln waste gas to air inlet/outlet.

Further, said humidity generator comprises the housing of enclosed construction, and housing inner chamber bottom is provided with water layer; The middle part is provided with the porous aggregate layer; The packing layer top is provided with spray equipment, and said water layer is that spray equipment supplies water through pump and pipeline, forms the circulation of water in housing; The said dry kiln waste gas of said thermal energy recoverer output is input in the humidity generator through the packing layer below of pipeline from the housing inner chamber; And in packing layer with from said spray equipment spray water down, fully contact, and export from the gas outlet, top of humidity generator after above packing layer, forming saturated with moisture in the cavity; Humidity generator has refrigeration and heater, and said control system controls the water temperature in the humidity generator through refrigeration and heater, with the control of realization to gas humidity that humidity generator is exported.

Further, the said dry kiln waste gas of said thermal energy recoverer output is input in the bottom water of said humidity generator through pipeline, and the gas that gets in the water floats naturally, exports from the gas outlet on humidity generator top after passing said packing layer.

Further, to the pipeline the said thermal energy recoverer, also be provided with gas flow control valve, realize thus passing in and out the further control of said dry kiln gas flow from said humidity generator gas outlet.

Further, said filter comprises the housing of enclosed construction, is perfused with scavenging solution in the housing, and housing is provided with inlet, outlet.

A kind of method for drying wood; Be specially: set the drying time of timber, the temperature rise curve in the dry kiln, the flow curve that dry kiln passes in and out gas, the moisture curve that is input to the gas in the dry kiln according to seeds, timber and lumber standards, make dry kiln carry out drying to timber according to the parameters of above-mentioned setting.

Further; Said method for drying wood carries out according to tree characteristics and/or timber and lumber standards segmentation; That is: the whole dry run with timber is divided into several time periods, makes dry kiln carry out work according to the moisture curve of different temperature rise curves, gas flow curve, input gas respectively in each time period.

A kind of method for drying wood; Be specially: drying time, the temperature rise curve of setting timber according to seeds, timber and lumber standards; Make dry kiln according to drying time and the temperature rise curve work set then; And according to the temperature in the dry kiln, humidity and moisture content data, adjust in real time dry kiln turnover gas flow, be input to the humidity of the gas in the dry kiln, the optimum moisture content change curve according to wood to be dried when dry carries out drying to it.

The drying of wood of the present invention system has the following advantages:

1, in whole dry run, system of the present invention is discharging waste gas in atmosphere not, does not pollute environmental protection.This is because compare with existing conventional drying method; Suppose that the conventional drying time is 10 hours, the steam vent radius is 5 centimetres, wind speed 5 meter per seconds; The conventional drying method intake and exhaust time accounts for 2/3 of total drying time; Dry run will be discharged high-temp waste gas 1413 cubic meters, and the heat energy in the combustion gas no longer does work, and be wasted.

2, system of the present invention fully reclaims the heat energy in the dry kiln institute waste discharge gas, reaches energy-conservation and the efficient utilization energy.Compare with existing drying means, under equal conditions, the native system energy-saving effect reaches more than 23%.The reason that the conventional drying method wastes energy is: during the dry kiln exhaust, the heat energy in the waste gas is wasted, and when dry kiln was air-breathing, the gas heating that give to get into is consumes energy again.In a word, during the dry kiln operation, unnecessary energy resource consumption can account for about 35% of its total energy consumption.

3, owing to can control in real time the humidity of gas in the input dry kiln according to the moisture content of the temperature in the dry kiln, humidity and the timber that is dried in the system works of the present invention; And can control at times according to its optimum drying curve according to the kind and the specification of timber, thus utilize the dry lumber quality of system of the present invention can with involve great expense, high-energy source consumption and vacuum drying that can only small lot batch manufacture and the quality of dielectric drying compare favourably.

4, since system of the present invention in when operation; The control system can be according to the humidity of the automatic controlled humidity gas that generator is exported of optimum drying curve of the moisture content of the temperature in the dry kiln, humidity, timber and timber; Automatically the flow of the gas of dry kiln is advanced/goes out in adjustment; Automatically control the wind speed in the dry kiln, thereby can realize the automation of drying of wood whole process and the intellectuality of control procedure.

The core of the drying of wood of the present invention system is to be provided with self-adjustable humidity generator and thermal energy recoverer.Wherein, humidity generator can dynamically be adjusted the humidity in the kiln body according to the situation of the moisture content of drying kiln for drying timber, makes wood drying quality reach optimization, power consumption minimizes, and energy-saving effect can reach more than 15%; Thermal energy recoverer makes the energy of recovery continue acting then with the live gas that passes to after the energy recovery in the dry kiln institute waste discharge gas to dry kiln input, reaches energy-saving and environmental protection and purpose efficiently, and energy-saving effect can reach more than 8%.Therefore, system of the present invention compares existing state-of-the-art drying kiln energy-saving and can reach more than 23%.

Description of drawings

Fig. 1 is a drying of wood system architecture sketch map of the present invention;

Fig. 2 is the structural representation of dry kiln;

Fig. 3 is a dry kiln A-A view;

Fig. 4 is the humidity generator structural representation;

Fig. 5 is the thermal energy recoverer structural representation;

Fig. 6 is a filter structure schematic representation.

The specific embodiment

The specific embodiment of drying means of the present invention and device is described with reference to the accompanying drawings.

Like Fig. 1-shown in Figure 5, the drying of wood of the present invention system comprises dry kiln 39, filter 42, thermal energy recoverer 41, humidity generator 40, control system 43; Exhaust outlet 7 (with reference to Fig. 3) on the dry kiln 39 links to each other through the exhaust gas entrance of pipeline with filter 42; The purified gas outlet of filter 42 links to each other with the high-temp waste gas input port 27 of thermal energy recoverer 41 through pipeline; The waste gas delivery outlet 26 of thermal energy recoverer 41 links to each other with the gas input port 25 of humidity generator 40 through pipeline; The saturated with moisture delivery outlet 19 of humidity generator 40 links to each other through the inlet end of pipeline with flow control valve 18; The outlet side of flow control valve 18 links to each other with the cryogenic gas input port 17 of thermal energy recoverer 41 through pipeline; The cryogenic gas delivery outlet 29 of thermal energy recoverer 41 links to each other with air inlet 6 on the dry kiln 39 through pipeline, forms the gas circulation loop of a sealing thus.

Like Fig. 2, shown in Figure 3; Dry kiln 39 is the dry kiln of existing conventional structure, and this dry kiln comprises hold down gag 1, closing door 2, heat-insulation layer 3, dry kiln thermal wall 4, valve control device 5, air inlet 6, exhaust outlet 7, circulating fan 8, bimetallic clad aluminum fin heater 9, unit of steam jet 10, deep bead 11, wet-bulb temperature tester 12, electrical impedance acquisition module 13, dry-bulb temperature tester 14, wheel 15, positive and negative blast dividing plate 16.

As shown in Figure 4, humidity generator 40 is made up of packing layer 23, water layer 24, gas input port 25 and refrigeration and the heating combined equipment (not shown) of flow control valve 18, saturated with moisture delivery outlet 19, spray head 20, housing 21, circulation waterway 22 (wherein pipeline and water pump do not illustrate separately), loose structure.

As shown in Figure 5; Thermal energy recoverer 41 is made up of cryogenic gas input port 17, cryogenic gas delivery outlet 29, waste gas delivery outlet 26, waste gas input port 27, shell 28; Be provided with heat exchanging pipe in the shell 28; The dry kiln waste gas of 27 inputs gets into the cavity outside the heat exchanging pipe from the input port, and the low temperature moisture of 17 inputs then gets into the heat exchanging pipe from the input port, and carries out exchange heat through duct wall and the outer waste gas of pipeline.

As shown in Figure 6, filter 42 is made up of waste gas input port 30, scavenging solution 31, housing 32, waste gas delivery outlet 33.

Control system 43 is electrically connected with dry kiln 39 interior wet-bulb temperature tester 12, dry-bulb temperature tester 14, electrical impedance acquisition module 13, circulating fan 8, bimetallic clad aluminum fin heater 9, valve control device 5, unit of steam jet 10 respectively, also is electrically connected with refrigeration and heater (not shown), humidity generator 40 interior water circulating pump, the flow control valves 18 of humidity generator 40 simultaneously.

The drying of wood of the present invention system can carry out work in two ways:

1. time method

Drying time, temperature rise curve, the dry kiln that the staff sets timber according to the specification (like thickness) of seeds, wood to be dried passes in and out the throughput curve, is input to the moisture curve of the gas in the dry kiln; Start dry kiln then and carry out work, finish until whole dry run by the program of setting.

Wherein drying time, temperature rise curve, turnover throughput curve, the moisture curve that is input to the gas in the dry kiln all can be tested definite in advance.

In addition; Characteristic according to the timber of different seeds and different size; In order to guarantee the quality of dry back timber better; The timber sectional carries out drying, that is: the whole dry run with timber is divided into several time periods, adopts the moisture curve of different temperature rise curves, gas flow curve, input gas respectively to each time period.The time of each time can be identical, also can be different, look seeds, that timber and lumber standards is come is fixed.

2. water cut method

The staff at first sets drying time, the temperature rise curve of timber according to the specification of seeds, wood to be dried; After starting dry kiln then; The electrical impedance acquisition module that makes the control system of dry kiln utilize doing in the kiln, wet-bulb temperature tester and be arranged on the timber is gathered temperature, humidity in the kiln in real time; And the real-time moisture content of wood to be dried; And according to resulting temperature, humidity and moisture content data, adjust in real time dry kiln turnover gas flow, be input to the humidity of the gas in the dry kiln, make wood to be dried carry out drying according to its optimum moisture content change curve.

Can find its optimum moisture content change curve through experiment during the drying of wood of different seeds, different size, carry out the quality that drying can guarantee dry back timber according to this curve.

According to water cut method timber being carried out drying equally also can divide the time period to carry out.

During drying of wood system works of the present invention, can carry out the selection of " seeds " with reference to following table.

Tree group species 1 Brazilian walnut tree, white virgin, Rhodesian teak 2 walnut, Juglans mandshurica, cloning, aspen, poplar, aspen , teak, oak 3 fir, white fir, camphor sub-fir, spruce, spruce, Tanglin fir, Abies fir, cedar, hemlock, Tsuga, ash, Douglas fir, lauan , ash wood, balsa wood, sandalwood, elm, lobed elm, Ulmus, Yunnan arborea, Quercus, dipterocarp, yellow pineapple, stained wood, maple wood, white cow maple, Ju wood, Quercus 4 red pine, white pine, pine, Yunnan pine, monkey puzzle, larch, larch, larch, Dacrydium, bamboo pine, basswood, Shaalan Yang, Shi Zi, magnolia, birch, white birch, Maple Leaf, Hebi Dong

Existing dry kiln is when operation, and the staff at first sets drying time, temperature rise curve according to the specification (like thickness) of seeds, wood to be dried, starts dry kiln then, promptly begins timber is carried out dried.Along with the operation of dry kiln, the high-temp waste gas in the kiln constantly is discharged into atmosphere, and the fresh air in the atmosphere is also constantly added in the dry kiln; Simultaneously, the staff controls the flow of dry kiln input and output gas again according to the real-time moisture content of the temperature in the dry kiln, humidity, the timber that is dried and the experience of oneself; And in kiln, spray into steam through unit of steam jet frequently; Regulate the humidity of kiln atmosphere, run to setting-up time, promptly accomplish dried timber until dry kiln.

With the drying of wood of the present invention system compared with prior art,, can eliminate dry kiln and discharge the harmful substances of wanting in the gas, reduce pollution atmosphere through filter is set; Thermal energy recoverer is set heat energy is fully used, reduce energy resource consumption, reduce energy waste; Humidity generator is set,, the humidity of the atmosphere in the dry kiln is changed reposefully, overcome spray steaming in the past and make the sudden change of kiln atmosphere humidity drying of wood quality adverse effect through the humidity of the gas in the input dry kiln is controlled; Especially after making the working gas periodic duty of dry kiln, energy-conservation, the reduction of discharging advantage of whole system are further promoted.

Method for drying wood of the present invention compared with prior art can make the timber of different seeds, different size carry out drying according to its best separately drying process condition respectively, thereby the dried timber quality is protected.

Claims (7)

1. a drying of wood system is characterized in that, comprises dry kiln, humidity generator, thermal energy recoverer, filter, control system, has inlet, outlet on the dry kiln; The high-temp waste gas that discharge the dry kiln gas outlet is the input thermal energy recoverer after filter filters; The cryogenic gas that in thermal energy recoverer, transports with humidity generator carries out discharging after the heat exchange, and the cryogenic gas after being heated of thermal energy recoverer output is sent into the dry kiln air inlet through pipeline; Import said humidity generator as source of the gas through pipeline from the said dry kiln waste gas that said thermal energy recoverer is discharged; After waste gas is manufactured the required moisture of system by humidity generator; After the thermal energy recoverer heating, sent back in the dry kiln once more and done work, formed the circulation of whole drying of wood system works gas thus; The work of said control system control dry kiln, and the humidity of the moisture content controlled humidity cryogenic gas that generator is exported that will control according to the temperature in the dry kiln, humidity and institute, with realization to importing the control of dry kiln gas humidity.
2. the system of claim 1; It is characterized in that; The inlet, outlet place of said dry kiln also is respectively arranged with valve, and said control system controls the open degree of dry kiln inlet, outlet through this valve, realizes the control to turnover dry kiln gas flow.
3. the system of claim 1; It is characterized in that said thermal energy recoverer is made up of the heat exchanging pipe that is provided with in housing and the inner chamber thereof, housing is provided with two pairs of air inlet/outlets; Wherein a pair of is the air inlet/outlet of said heat exchanging pipe; This is used for the turnover of said cryogenic gas to air inlet/outlet, and another is to air inlet/outlet and housing intracavity inter-connection, and this is used for the turnover of said dry kiln waste gas to air inlet/outlet.
4. the system of claim 1; It is characterized in that said humidity generator comprises the housing of enclosed construction, housing inner chamber bottom is provided with water layer; The middle part is provided with the porous aggregate layer; The packing layer top is provided with spray equipment, and said water layer is that spray equipment supplies water through pump and pipeline, forms the circulation of water in housing; The said dry kiln waste gas of said thermal energy recoverer output is input in the humidity generator through the packing layer below of pipeline from the housing inner chamber; And in packing layer with from said spray equipment spray water down, fully contact, and export from the gas outlet, top of humidity generator after above packing layer, forming saturated with moisture in the cavity; Humidity generator has refrigeration and heater, and said control system controls the water temperature in the humidity generator through refrigeration and heater, with the control of realization to gas humidity that humidity generator is exported.
5. system as claimed in claim 4; It is characterized in that; The said dry kiln waste gas of said thermal energy recoverer output is input in the bottom water of said humidity generator through pipeline, and the gas that gets in the water floats naturally, exports from the gas outlet on humidity generator top after passing said packing layer.
6. system as claimed in claim 5 is characterized in that, to the pipeline the said thermal energy recoverer, also is provided with gas flow control valve from said humidity generator gas outlet, realizes thus passing in and out the further control of said dry kiln gas flow.
7. the system of claim 1 is characterized in that, said filter comprises the housing of enclosed construction, is perfused with scavenging solution in the housing, and housing is provided with inlet, outlet.
CN200910084710A 2009-05-25 2009-05-25 Method and system for drying wood CN101561216B (en)

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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN200910084710A CN101561216B (en) 2009-05-25 2009-05-25 Method and system for drying wood

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CN101561216B true CN101561216B (en) 2012-09-05

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