CN113280579A - Method for evaporating wood by using evaporation furnace - Google Patents
Method for evaporating wood by using evaporation furnace Download PDFInfo
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- CN113280579A CN113280579A CN202110592611.XA CN202110592611A CN113280579A CN 113280579 A CN113280579 A CN 113280579A CN 202110592611 A CN202110592611 A CN 202110592611A CN 113280579 A CN113280579 A CN 113280579A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
- F26B9/06—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/04—Heating arrangements using electric heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/001—Handling, e.g. loading or unloading arrangements
- F26B25/003—Handling, e.g. loading or unloading arrangements for articles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/06—Chambers, containers, or receptacles
- F26B25/14—Chambers, containers, receptacles of simple construction
- F26B25/18—Chambers, containers, receptacles of simple construction mainly open, e.g. dish, tray, pan, rack
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/22—Controlling the drying process in dependence on liquid content of solid materials or objects
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/32—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action
- F26B3/34—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action by using electrical effects
- F26B3/347—Electromagnetic heating, e.g. induction heating or heating using microwave energy
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Electromagnetism (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Biotechnology (AREA)
- Sustainable Development (AREA)
- Molecular Biology (AREA)
- Drying Of Solid Materials (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
Abstract
The invention relates to the technical field of wood processing, and discloses a method for evaporating wood by using a drying furnace. The method comprises S1: putting the wood to be dried by distillation into a drying furnace, and injecting water into a water tank; s2: heating all water in the water tank into water vapor in the furnace by using microwaves; s3: heating water vapor in the furnace to a first set temperature; s4: reducing the water vapor in the furnace to a second preset temperature, wherein the second preset temperature is 3-5 ℃ lower than the first preset temperature; s5: raising the temperature of the water vapor in the furnace to the first set temperature again; and repeating the steps S4 and S5 until the wood in the furnace is evaporated to the required moisture content. The method only uses water vapor as a heating carrier, does not need a dry heat source to directly heat the wood, can steam the wood fibers, avoids the wood from deforming and expanding in the drying process, does not damage the wood fibers and resin and mineral substances in the wood, and ensures the toughness of the wood.
Description
Technical Field
The invention relates to the technical field of wood processing, in particular to a method for evaporating wood by using a drying furnace.
Background
The stability of wood is an important indicator of wood quality, and the main reason for the instability of wood is due to the elasticity of immature original wood fibers: the wood fiber loses its own moisture and contracts, and absorbs moisture in a humid environment and stretches. The resin and mineral substances in the wood not only increase the density and toughness of the wood, but also solidify or crystallize during the drying process, so that the stability of the wood can be increased. Therefore, before deep processing of wood, wood fibers need to be cured to reduce moisture in the wood fibers, and resin and mineral substances in the wood cannot be damaged, so that the stability of the wood is improved, and the toughness of the wood is prevented from being damaged, and thus, the phenomena of deformation, cracking and the like of a finished wood product cannot occur in later use.
At present, the existing wood drying is a method for drying wood by adopting a dry heat source, the specific method is that the wood in a drying furnace is directly heated and dried by heat source radiation and hot air convection, or the interior of the wood is heated and dried by directly radiating the wood by microwave, and the dry heat source drying method has many problems:
1) surface cracking, wherein the surface of the wood is rapidly dried by dry heat drying, the dried part on the surface is rapidly shrunk, and the moisture in the wood is expanded after being heated, so that opposite forces inside and outside the wood are generated, and the surface cracking of the wood is caused;
2) the wood fiber is internally cracked, resin in the wood is easily cured or crystallized quickly by dry heat drying before the wood fiber is cured, a water channel in the wood is blocked by the cured or crystallized resin, and the wood is extremely expanded by internal water after being heated, so that the wood is cracked, and the internal cracking of the wood is caused.
3) The dry-heat drying temperature is difficult to control, if the dry-heat drying temperature is controlled within 80 ℃, wood fibers are not sufficiently cured, and if the dry-heat drying temperature exceeds 80 ℃, the wood fibers are embrittled and resin and mineral substances are damaged, so that the toughness of the wood fibers is damaged, and the phenomena of surface cracking and internal cracking are more serious.
Although there is a method of introducing steam into the furnace in the process of directly heating and drying the wood by the dry heat source in the prior art, the action of the steam is only used for maintaining the environment in the furnace at a certain humidity, so as to reduce the difference of the water content inside and outside the wood, improve the heating uniformity to a certain extent, and reduce the deformation of the wood, but the steam is not used as the main heat source to heat the wood, the steam is not enough to steam the wood fibers, and the heating mode is still the dry heat source drying: that is, the wood is directly heated by high-temperature dry heat source radiation and hot air convection or microwave radiation, the problems of surface cracks, internal cracks and damage to wood fibers and internal beneficial components still cannot be solved.
Disclosure of Invention
In view of the above problems in the prior art, an object of the present invention is to provide a microwave method for drying wood by distillation, which simply relies on water vapor as a heat source to dry the wood, and the wood fibers are steamed before drying, so as to prevent the wood from deforming and even swelling during the drying process, and the wood fibers, the resin and the mineral substances in the wood are not damaged, thereby ensuring the toughness of the wood.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for evaporating wood by using an evaporation furnace, wherein the evaporation furnace comprises a furnace body, a microwave assembly, a mesh type microwave shield and a water tank, the water tank and the mesh type microwave shield are arranged in the furnace body, a water drainage and air exhaust port is arranged at the bottom of the furnace body, and the mesh type microwave shield is used for blocking microwaves from directly radiating the wood in the furnace, and the method comprises the following steps:
s1: putting the wood to be dried to dryness into the furnace body, and injecting water into the water tank;
s2: starting the microwave assembly, and heating and evaporating all water in the water tank into water vapor in the furnace by using microwaves;
s3: the microwave assembly continues to heat the water vapor in the furnace, so that the temperature of the water vapor in the furnace is gradually increased to a first preset temperature, and in the temperature increasing process, the water vapor in the furnace heats the wood in the furnace, so that the wood fiber is steamed, and part of water in the wood is heated into the water vapor in the wood at the first preset temperature;
s4: reducing the power of the microwave assembly, reducing the temperature of water vapor in the furnace to a second preset temperature, wherein the second preset temperature is 3-5 ℃ lower than the first preset temperature, condensing part of water vapor in the furnace in the temperature reduction process, discharging condensed water from the water and gas discharge port, and releasing the water vapor in the wood into the furnace from the interior of the wood;
s5: increasing the power of the microwave assembly, raising the temperature of the water vapor in the furnace to the first preset temperature again, wherein in the temperature raising process, the water vapor in the furnace is heated and expanded, part of the water vapor is discharged from the water discharge and air exhaust port, the residual water vapor in the furnace heats the wood in the furnace again, and part of the residual water in the wood is heated into the water vapor in the wood at the first preset temperature;
and repeating the steps S4 and S5, and carrying out a plurality of temperature reduction and temperature rise processes until the wood in the furnace is evaporated to the required moisture content.
Preferably, a through hole is formed in the furnace body, the microwave assembly comprises a microwave generator, a waveguide tube and a waveguide plate, the microwave generator is arranged outside the furnace body, one end of the waveguide tube is communicated with the microwave generator, the other end of the waveguide tube penetrates through the through hole to extend into the furnace body, and the waveguide plate is connected to the other end of the waveguide tube.
Preferably, the first set temperature is 70-120 ℃.
Preferably, a weigher is arranged at the bottom of the drying furnace.
Preferably, an electric controller is further arranged on the outer side of the drying furnace and is in communication connection with the microwave assembly.
The invention utilizes the saturated steam generated by microwave once and the unsaturated steam generated after steam is continuously heated to heat the wood, the moisture in the wood after temperature reduction is discharged in the form of saturated steam, and part of the steam discharged from the wood is used as a heating carrier for continuously drying the wood by distillation. The microwave wood drying method disclosed by the invention has the following beneficial effects:
1. the method for drying the wood by distillation overcomes the prejudice of the prior art, and the prior art considers that the wood is directly heated without a dry heat source, only water vapor is used as a carrier for directly heating the wood, the water vapor can humidify the wood instead, and the wood can not be dried forever. However, the method skillfully utilizes a plurality of alternating processes of temperature rise, temperature reduction and temperature rise, water in the wood is heated into steam through high-temperature steam, then the furnace temperature is reduced to release the steam in the wood into the furnace, and the furnace temperature is raised to expand and discharge the divided steam in the furnace, so that the water in the wood is continuously evaporated, released and discharged out of the furnace, and finally the drying requirement is met.
2. According to the invention, the wood fiber is steamed by high-temperature water vapor, and the high-temperature damp heat can ripen the wood fiber, eliminate the activity and internal stress of the wood fiber, avoid the expansion and contraction of the wood fiber in the subsequent drying and using processes, and also avoid the problem of wood fiber embrittlement caused by high-temperature dry heat ripening.
3. According to the invention, the wood is heated by high-temperature steam, so that wood fibers can be gradually steamed and ripened from outside to inside, and meanwhile, resin in the wood can be softened, so that a moisture passage in the wood is opened, the discharge of water vapor in the wood is facilitated, and the wood is prevented from being expanded by the steam in the wood; and beneficial components such as resin in the wood are not damaged by heating with water vapor.
4. The invention skillfully utilizes part of vapor released from the wood as a heating carrier for subsequent heating and drying the wood by distillation, therefore, only water is required to be injected into the water tank for the first time and the water in the water tank is completely evaporated at one time by microwave, no new water is required to be added into the water tank in the subsequent steps, no new vapor is required to be continuously introduced into the furnace, and the whole process is simple, continuous and high in automation degree.
5. The invention utilizes the temperature reduction step to condense and discharge part of the water vapor in the furnace, utilizes the temperature re-rise step to rapidly expand and discharge the surplus vapor, does not need to arrange a special exhaust device such as an exhaust fan, and saves the cost.
6. The microwave dryer adopts the mesh type microwave shield to shield microwaves, the design is ingenious, water vapor can conveniently and freely enter and exit the microwave shield, the microwave assembly can continuously heat steam generated by a water tank and steam released from wood in the whole drying process, and the structure that the wood is damaged by the direct radiation of the microwaves on the wood can be avoided. In the prior art, a microwave assembly is arranged outside a furnace but the inside of the furnace is not provided with a microwave shield, in the design, microwaves can directly radiate wood, the internal temperature of the wood can be rapidly increased, and internal cracking and carbonization of the wood are easily caused.
Detailed Description
The present invention will be described in further detail with reference to examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases by those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used for convenience of description and simplicity of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
The embodiment discloses a method for evaporating wood by using an evaporation furnace, which is used for completing evaporation treatment of the wood in the evaporation furnace, wherein the evaporation furnace comprises a furnace body, a microwave assembly, a mesh-type microwave shield and a water tank, the water tank and the mesh-type microwave shield are arranged in the furnace body, and a water drainage and exhaust port is arranged at the bottom of the furnace body. The water tank is used for injecting a certain amount of water at one time; the microwave assembly is used for generating microwaves to heat and evaporate water in the water tank and heat water vapor in the oven body; the drainage and exhaust port can be provided in plural, and can be used for both drainage and exhaust. The mesh microwave shield is used to block microwaves from directly radiating the wood in the oven throughout the entire steaming process.
Exemplarily, a furnace body of the evaporation furnace is in a cuboid shape, a plurality of supports are arranged at the bottom of the furnace body, a wood access door is arranged on one side of the furnace body, and a water filling port is arranged on the other side of the furnace body; the microwave oven comprises an oven body, and is characterized in that a heat insulation layer is arranged in the oven body, a plurality of through holes are formed in the wall of the oven body, the number of microwave assemblies is the same as that of the through holes, each microwave assembly comprises a microwave generator, a waveguide tube and a waveguide plate, the microwave generator is arranged outside the oven body, one end of each waveguide tube is communicated with the microwave generator, the other end of each waveguide tube penetrates through the through hole to stretch into the oven body, and the waveguide plates are connected to the other ends of the waveguide. The mesh type microwave shield cover is arranged above the water tank and forms a space with the inner wall of the oven body, the waveguide plate is positioned in the space, and the space is communicated with the main body space in the oven body through meshes of the microwave shield. The specific use mode is as follows: microwave generator outside the stove body produces the microwave, and the microwave passes through in the waveguide pipe introduction stove body, and the waveguide board sets up to microwave direction basin, can be the vapor through the microwave to the water heating in the basin, and the mesh that the vapor that generates can pass through gets into the main part space in the stove body, and the vapor in the main part space also can get into enclose and establish the space and heat, that is to say through the above-mentioned design of microwave subassembly, basin and mesh formula microwave shield, should enclose and establish the space and block the microwave give off the timber in going the direct radiation stove, can not influence and all heat enclosing the vapor of establishing the space inside and outside. Of course, the composition and structure of the above-mentioned drying oven are only exemplary, and the drying oven adopted in the present invention may be other composition and structure which can be alternatively realized, as long as the microwave wood drying method of the present invention can be implemented.
The microwave wood drying method specifically comprises the following steps:
s1: and putting the wood to be dried by distillation into a drying furnace, and injecting water into the water tank.
Specifically, the wood to be dried by distillation can be loaded on a skip car, and the wood to be dried by distillation can be loaded in the drying furnace through a wood access door on one side of the furnace body of the drying furnace. Then, a certain amount of water is injected into the water tank in the drying furnace, and the specific required weight of the injected water is related to the weight of the loaded wood.
S2: and starting the microwave assembly, and heating and evaporating all the water in the water tank into water vapor in the furnace by using microwaves.
Preferably, the outer side of the drying furnace is further provided with an electric controller, the electric controller is in communication connection with the microwave assembly, the microwave assembly can be opened and closed through operation of the electric controller, and the power of the microwave assembly can be adjusted. Specifically, the electric controller is operated to start the microwave assembly, and the water in the water tank is heated into water vapor in the furnace at one time by using microwaves. It is noted that by the provision of the microwave shield, the microwave assembly in this embodiment is able to radiatively heat the water in the water bath and the water vapour in the oven, and is not able to directly radiate the wood itself in the oven.
S3: and the microwave assembly continues to heat the water vapor in the furnace, so that the temperature of the water vapor in the furnace is gradually increased to a first preset temperature, and in the temperature increasing process, the water vapor in the furnace heats the wood in the furnace, so that the wood fiber is steamed and part of water in the wood is heated into the water vapor in the wood at the first preset temperature.
After the water in the water tank is completely evaporated into steam, the microwaves of the microwave assembly continue to heat the steam in the furnace until the steam is heated to the high-temperature unsaturated steam with the first set temperature, the temperature rising process is gradual and slow, and the time is more than 10 hours, so that the temperature in the furnace can be raised to the first preset temperature. In the gradual temperature rise process, high-temperature water vapor in the furnace heats the wood in the furnace from outside to inside, gradually evaporates and cures wood fibers and softens resin in the wood, simultaneously heats water in the wood, evaporates partial water into the water vapor in the wood, and continuously heats the water vapor in the wood until the water vapor and the furnace temperature reach a first preset temperature together. The first predetermined temperature is dependent in particular on the type of wood to be dried and preferably ranges from 70 to 120 ℃. On one hand, the water vapor in the temperature range can enable the water vapor to reach an unsaturated state, and is also enough to gradually and completely evaporate and cure the wood fibers from outside to inside, simultaneously soften the resin in the wood, further open a moisture passage in the wood, facilitate the discharge of the water vapor in the wood and avoid the expansion of the wood by the internal steam; on the other hand, the water vapor temperature in this temperature range is not so high as to destroy the wood fibers and the beneficial components such as resins, minerals and the like inside the wood.
S4: and (3) reducing the power of the microwave assembly, reducing the temperature of the water vapor in the furnace to a second preset temperature, wherein the second preset temperature is 3-5 ℃ lower than the first preset temperature, condensing part of the water vapor in the furnace in the temperature reduction process, discharging condensed water from the water and gas exhaust port, and releasing the water vapor in the wood into the furnace from the wood.
And reducing the power of the microwave assembly by operating the electric controller to reduce the temperature of the water vapor in the furnace to a second preset temperature, wherein the second preset temperature is 3-5 ℃ lower than the first preset temperature. In the process, on one hand, the temperature in the furnace is firstly reduced, so that partial water vapor in the furnace can be condensed, the humidity in the furnace is reduced, and the condensed water is discharged out of the furnace from a water discharge and exhaust port at the bottom of the furnace. On the other hand, the temperature of the water vapor in the wood does not immediately decrease, but is still higher than the temperature of the water vapor in the furnace, so that the water vapor in the wood in turn heats the water vapor in the furnace, and the water vapor in the wood can be released from the wood into the furnace in the form of relatively saturated water vapor. That is, part of the moisture in the wood is evaporated to the outside of the wood, and partial evaporation of the wood is achieved.
S5: and increasing the power of the microwave assembly, raising the temperature of the water vapor in the furnace to the first preset temperature again, wherein in the temperature raising process, the water vapor in the furnace is heated to rapidly expand, part of the water vapor is discharged from the water discharge exhaust port, the residual water vapor in the furnace heats the wood in the furnace again, and part of the residual water in the wood is heated to the water vapor in the wood at the first preset temperature.
The power of the microwave component is increased by operating the electric controller, the temperature of the water vapor in the oven is raised to the first set temperature again by using microwaves, and in the process, on one hand, the water vapor in the oven (containing the water vapor released from wood at the moment) is heated and rapidly expanded, and the redundant water vapor in the oven is discharged out of the oven from a water discharge and exhaust port at the bottom of the oven for drying by distillation; on the other hand, a part of water vapor still remains in the furnace, and the residual water vapor in the furnace becomes high-temperature unsaturated water vapor again, and the residual water vapor is used as a new heating carrier to heat a part of the residual water in the wood into the water vapor in the wood at the first preset temperature, so that the wood is subjected to a new round of heating and drying by distillation.
And repeating the steps S4 and S5, and carrying out a plurality of temperature reduction and temperature rise processes until the wood in the furnace is evaporated to the required moisture content. Through repeated cooling and heating operations, the redundant moisture in the wood is gradually released into the furnace in the form of saturated steam, then part of the steam in the furnace is quickly expanded and discharged out of the furnace, after a plurality of drying cycles, when the moisture content of the wood in the furnace is detected to meet the drying requirement, the electric controller can be operated to close the microwave assembly, and after the temperature in the furnace is reduced to a preset temperature (such as room temperature), the furnace door is opened, and the wood is taken out. As to how to judge whether the wood in the furnace reaches the required moisture content, the field has a plurality of conventional maturity detection and judgment modes. In this embodiment, a weight comparison method is preferred, and specifically, a weighing device is disposed at the bottom of the evaporation furnace, and if the furnace body is entirely placed on a scale, the scale can display the total weight of the evaporation furnace and the wood placed therein. As the moisture of the wood is gradually released and discharged out of the furnace in the drying process, the reading of the weighing device is gradually reduced, and the reading corresponds to the moisture content of the wood one by one. Thus, when the reading is reduced to a preset weight, the wood is considered to have evaporated to a preset desired moisture content.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions without departing from the scope of the invention. Therefore, although the present invention has been described in more detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (5)
1. A method for evaporating wood by using an evaporation furnace is characterized in that the evaporation furnace comprises a furnace body, a microwave assembly, a mesh type microwave shield and a water tank, the water tank and the mesh type microwave shield are arranged in the furnace body, a water drainage and air exhaust port is arranged at the bottom of the furnace body, the mesh type microwave shield is used for blocking microwaves from directly radiating the wood in the furnace, and the method comprises the following steps:
s1: putting the wood to be dried to dryness into the furnace body, and injecting water into the water tank;
s2: starting the microwave assembly, and heating and evaporating all water in the water tank into water vapor in the furnace by using microwaves;
s3: the microwave assembly continues to heat the water vapor in the furnace, so that the temperature of the water vapor in the furnace is gradually increased to a first preset temperature, and in the temperature increasing process, the water vapor in the furnace heats the wood in the furnace, so that the wood fiber is steamed and part of water in the wood is heated into the water vapor in the wood at the first preset temperature;
s4: reducing the power of the microwave assembly, reducing the temperature of water vapor in the furnace to a second preset temperature, wherein the second preset temperature is 3-5 ℃ lower than the first preset temperature, condensing part of water vapor in the furnace in the temperature reduction process, discharging condensed water from the water and gas discharge port, and releasing the water vapor in the wood into the furnace from the interior of the wood;
s5: increasing the power of the microwave assembly, raising the temperature of the water vapor in the furnace to the first set temperature again, wherein in the temperature raising process, the water vapor in the furnace is heated and expanded, part of the water vapor is discharged from the water discharge and exhaust port, the residual water vapor in the furnace heats the wood in the furnace again, and one part of the residual water in the wood is heated to be the water vapor in the wood at the first preset temperature;
and repeating the steps S4 and S5, and carrying out a plurality of temperature reduction and temperature rise processes until the wood in the furnace is evaporated to the required moisture content.
2. The method for evaporating wood by using the evaporation furnace as claimed in claim 1, wherein a through hole is formed in the furnace body, the microwave assembly comprises a microwave generator, a waveguide tube and a waveguide plate, the microwave generator is arranged outside the furnace body, one end of the waveguide tube is communicated with the microwave generator, the other end of the waveguide tube penetrates through the through hole and extends into the furnace body, and the waveguide plate is connected to the other end of the waveguide tube.
3. A method of evaporating wood by means of an evaporation oven as claimed in claim 1-2, characterised in that the first set temperature is 70-120 ℃.
4. A method of evaporating wood by means of an evaporation oven as claimed in claims 1-3, characterised in that the bottom of the evaporation oven is provided with a weigher.
5. A method of evaporating wood by using an evaporating furnace according to claims 1-5, characterized in that an electric controller is arranged outside the evaporating furnace, and the electric controller is in communication connection with the microwave assembly.
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| FR2636127A1 (en) * | 1988-09-02 | 1990-03-09 | Bertin & Cie | Method and installation for drying wood, of the discontinuous type, in the presence of steam |
| CN1815115A (en) * | 2006-03-13 | 2006-08-09 | 张云辉 | Wood rapid-drying method |
| CN103017485A (en) * | 2011-09-24 | 2013-04-03 | 潘成锋 | High-temperature and high-humidity rapid drying process method for wood |
| CN202922704U (en) * | 2012-10-31 | 2013-05-08 | 杜慕楠 | Wood steam drying kiln |
| CN204854194U (en) * | 2015-08-14 | 2015-12-09 | 山东德润机电设备制造有限公司 | Equipment of kiln dried wood |
| CN107178993A (en) * | 2017-04-28 | 2017-09-19 | 中南林业科技大学 | Minute-pressure superheated steam Wood drying apparatus and application method |
| CN107525356A (en) * | 2017-08-11 | 2017-12-29 | 中南林业科技大学 | The steam drying of camphorwood vaporization water and essential oil and waste-heat recovery device and application method |
| CN109708430A (en) * | 2019-01-10 | 2019-05-03 | 寇宗辉 | A kind of damp and hot microwave timber drying equipment |
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