CN105459240A - Equipment for reducing formaldehyde emission of artificial board by microwave vacuum process - Google Patents
Equipment for reducing formaldehyde emission of artificial board by microwave vacuum process Download PDFInfo
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- CN105459240A CN105459240A CN201510787578.0A CN201510787578A CN105459240A CN 105459240 A CN105459240 A CN 105459240A CN 201510787578 A CN201510787578 A CN 201510787578A CN 105459240 A CN105459240 A CN 105459240A
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- microwave
- formaldehyde
- equipment
- artificial board
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
- B27K5/003—Treating of wood not provided for in groups B27K1/00, B27K3/00 by using electromagnetic radiation or mechanical waves
- B27K5/0065—Ultrasonic treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K2200/00—Wooden materials to be treated
- B27K2200/10—Articles made of particles or fibres consisting of wood or other lignocellulosic material
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
Abstract
The invention discloses equipment for reducing formaldehyde emission of an artificial board by a microwave vacuum process, and belongs to the field of wood product microwave formaldehyde-reducing equipment. A microwave acting cavity of the equipment is in the shape of a cylinder, and is horizontally mounted; the two ends of the microwave acting cavity are provided with a spherical-crown-shaped charge cabin door and a spherical-crown-shaped discharge cabin door, and windows are respectively formed in the charge cabin door and the discharge cabin door; at least one row of uniformly-distributed microwave feeding holes is formed in inner walls of cylinders at left and right sides in a generatrix direction of the cylinders; a plurality of temperature sensors and a vacuum meter are arranged on the inner part of the microwave acting cavity; the temperature sensors and the vacuum meter are respectively connected to a controller; a guide rail is arranged on the bottom of the microwave acting cavity for allowing a material supply and transportation trolley to park and pass through; row rollers of the artificial board are arranged on the material supply and transportation trolley; and the microwave acting cavity is sequentially connected to a vacuum pump and a formaldehyde recycling device by virtue of a pipeline. The equipment can effectively solve the problem that the formaldehyde emission of the artificial board exceeds standards, and meets continuous and batched industrial production requirements.
Description
Technical field
The present invention relates to a kind of industrial equipment reducing artificial board formaldehyde, belong to the formaldehyde reduced apparatus field of woodwork microwave.
Background technology
Urea-formaldehyde resin adhesive is due to function admirable, the advantage such as with low cost and become the main glue kind of producing wood-based plate, but this kind of wood-based plate often serious harm health because burst size of methanal exceeds standard.Improve adhesive, add formaldehyde catching agent and adopt the methods such as rational wood-based plate heat pressing process can reduce content of formaldehyde in wood-based plate to a certain extent, but due to sheet material mechanical property, production cost and presentation quality etc. will be considered, said method reduces the limited efficiency of burst size of methanal, makes still may discharge a large amount of free formaldehydes in the wood-based plate finished product produced.
For this reason, what wood-based plate also needed to carry out the later stage falls aldehyde process, veneer edge sealing be current wood-based panel industry generally adopt aldehyde method is fallen, its role is to the Form aldehyde release limiting wood-based plate on the one hand, on the other hand also prevent wood-based plate moisture absorption thus make urea-formaldehyde resin adhesive that hydrolysis and release formaldehyde occur, if but finishing material once occur damaged, the formaldehyde of its inner accumulation can discharge at double, therefore, this method fundamentally can not reduce the burst size of methanal of wood-based plate.Hot ammonia treatment effectively can eliminate the formaldehyde in wood-based plate, but ammonia consumption is comparatively large, and processing procedure is slow, and complicated huge treatment facility also makes high cost.Application of vacuum is concentration of formaldehyde that under utilizing condition of negative pressure, artificial intralamellar part and external environment produce difference thus promotes the process that free formaldehyde discharges, but, independent application of vacuum to the separation of wood-based plate inside formaldehyde molecule and the influence of diffusion less, therefore efficiency is lower.The degradation efficiency of dielectric barrier discharge facture to the formaldehyde gas that wood-based plate discharges is higher, but the commercial Application of large-scale needs the generation suppressing harmful side product further, increases reaction selectivity, reduces energy consumption and operating cost.
The aldehyde Method and Technology that falls in above-mentioned various wood-based plate later stage is often subject to the restriction of the factors such as treatment effeciency, energy consumption, pollution and operating cost and is difficult to be applied in wood-based panel industry on a large scale.
Summary of the invention
In order to effectively solve the problem that artificial board formaldehyde burst size exceeds standard, and for above-mentioned problems of the prior art and defect, a kind of microwave vacuum method is the object of the present invention is to provide to reduce the equipment of artificial board formaldehyde burst size.
To achieve these goals, the present invention adopts following design:
Microwave vacuum method reduces an equipment for artificial board formaldehyde burst size, and the microwave action chamber (3) of this equipment is cylindrical shape, and level is installed, and can improve the uniformity of microwave distribution, also meet the designing requirement of general pressure vessel; Charging hatch door and the discharging hatch door of spherical crown shape is provided with, to prevent microwave leakage and to keep the vacuum of inside, microwave action chamber at the two ends in microwave action chamber.
Charging hatch door and discharging hatch door are respectively equipped with form, can observe its inner case.
The left and right sides cylindrical wall of inside, microwave action chamber is at least provided with a row equally distributed microwave feedback mouth along cylinder generatrix direction, and at least two microwave feedback mouths are drawn together in every package, with the efficiency of the uniformity and microwave treatment that improve microwave distribution; Microwave feedback mouth is connected with controller with magnetron successively.
Multiple temperature sensor and a vacuum meter are housed in inside, microwave action chamber; Temperature sensor, vacuum meter are connected with controller respectively, can measure in real time the temperature in wood-based plate processing procedure and vacuum.
The bottom in microwave action chamber is provided with guide rail, park for material conveying trolley and pass through, material conveying trolley is provided with the multilayer row roller that level is installed, correspondingly can placement of multiple layers wood-based plate, the throughput direction of row's roller is identical with cylinder generatrix direction, be convenient to load and unload wood-based plate, the distance between adjacent two layers row roller is at least the twice of artificial board thickness, accelerates the rate of release of wood-based plate formaldehyde in processing procedure to increase microwave action in the area of wood-based plate.
The microwave action chamber of this equipment connects vavuum pump and formaldehyde retracting device successively by pipeline; Vavuum pump provides certain negative pressure for microwave action chamber is inner and the formaldehyde gas that wood-based plate is produced in processing procedure enters formaldehyde retracting device by closed conduit, and the formaldehyde of recovery can as the raw material producing urea-formaldehyde resin adhesive after certain post-processed; Described formaldehyde retracting device adopts the principle of washing to reclaim formaldehyde.
The microwave that described equipment can be 915MHz or 2450MHz according to selection frequencies such as the thickness of wood-based plate, useful loads processes wood-based plate.
Described charging hatch door and discharging hatch door are provided with screen layer and sealant.
Described controller can to the display of temperature, vacuum and microwave input power, record and regulation and control.
Operation principle of the present invention is:
Formaldehyde is divided into two stages as the release of major pollutants, first be under the effect of concentration gradient, formaldehyde molecule is moved near material interface by the sandwich layer of material, then on gas-solid interface, due to the existence of external environmental factor, molecular motion and material hole, some formaldehyde molecules depart from material surface again under the effect of concentration gradient, enter into the external environment of surrounding, mix in little space rapidly subsequently, the exchange along with gas is pulled away and reaches balance gradually.Therefore, in processing procedure, increase the separation of formaldehyde in wood-based plate inside and diffusion energy effectively reduce content of formaldehyde in wood-based plate, the concentration difference increasing formaldehyde inside and outside sheet material is then conducive to the evaporation rate accelerating formaldehyde.
In microwave heating process, the temperature on wood-based plate surface is lower than core layer temperature, the moisture gradient low inside and high outside with wood-based plate is identical, this moisture just accelerated in wood-based plate moves and from inside to outside from surface evaporation, thus provides passage and driving force for the migration of formaldehyde molecule in wood-based plate.Wood-based plate inevitably also exists the content of formaldehyde of sandwich layer higher than top layer in manufacturing process, and formaldehyde has characteristic soluble in water, therefore, has also taken away the formaldehyde in wood-based plate while moisture loss.In addition, also rate of release can be accelerated when formaldehyde is subject to microwave action as a kind of polar molecule.Meanwhile, under the effect of vavuum pump, the negative pressure produced in microwave microwave action chamber adds the concentration difference of formaldehyde gas inside and outside sheet material, is also conducive to the volatilization of formaldehyde.The formaldehyde gas that wood-based plate produces in processing procedure enters formaldehyde retracting device by closed conduit under the swabbing action of vavuum pump, and the formaldehyde of collection can as the raw material producing urea-formaldehyde resin adhesive after necessarily processing.
Therefore, this invention can efficiently, in batches, continuous print falls aldehyde process to wood-based plate, and can realize the recycling of pollutant.
Accompanying drawing explanation
Fig. 1 is system architecture schematic diagram of the present invention
Fig. 2 is microwave action cavity configuration schematic diagram of the present invention
Fig. 3 is row's roller schematic diagram of the present invention
Wherein, 1. form, 2. charging hatch door, 3. microwave action chamber, 4. temperature sensor, 5. wood-based plate, 6. arrange roller, 7. material conveying trolley, 8. microwave feedback mouth, 11. controllers, 12. guide rails, 13 vacuum meters, 14. vavuum pumps, 15 formaldehyde retracting devices, 16. discharging hatch doors.
Detailed description of the invention
Below in conjunction with accompanying drawing, also by embodiment, the present invention will be further described.
This equipment adopts microwave vacuum technology to fall aldehyde process to wood-based plate, microwave operational frequencies is 915MHz or 2450MHz, frequency is the microwave equipment cost of 915MHz is the microwave equipment of 2450MHz higher than frequency, but the former has larger penetration depth, therefore, microwave frequency can be selected according to concrete conditions such as the thickness of handled wood-based plate, useful loads in industrial production.
The microwave action chamber 3 of this equipment is cylindrical shape, level is installed, and can improve the uniformity of microwave distribution, also meet the designing requirement of general pressure vessel, in production reality, the large I in microwave action chamber makes the appropriate adjustments according to the dimensions of handled wood-based plate.
This equipment is provided with charging hatch door 2 and the discharging hatch door 16 of spherical crown shape, charging hatch door 2 and discharging hatch door 16 are provided with screen layer and sealant, to prevent microwave leakage and to keep the vacuum of inside, microwave action chamber, charging hatch door 2 and discharging hatch door 16 are provided with form 1, can observe when this equipment works to its inner case.
The left and right sides cylindrical wall of this inside, equipment microwave action chamber 3 is at least provided with a row equally distributed microwave feedback mouth 8 along cylinder generatrix direction, and at least two microwave feedback mouths 8 are drawn together in every package, with the efficiency of the uniformity and microwave treatment that improve microwave distribution, microwave feedback mouth 8 microwave feedback mouth is connected with controller 11 with magnetron successively, microwave system adopts the energy regenerative mode of INDIRECT COUPLING to reduce the power density of energy regenerative coupling aperture, prevents gas breakdown and arcing electric discharge phenomena.
Temperature sensor 4, the vacuum meter 13 of this equipment are connected with controller 11 respectively, can realize display to the temperature in wood-based plate processing procedure, vacuum and microwave input power, record and regulation and control by controller 11.
The bottom in this equipment microwave action chamber is provided with guide rail 12, park for material conveying trolley 7 and pass through, material conveying trolley 7 is provided with the multilayer row roller 6 that level is installed, correspondingly can placement of multiple layers wood-based plate 5, the throughput direction of row's roller 6 is identical with cylinder generatrix direction, be convenient to load and unload wood-based plate, the distance between adjacent two layers row roller is at least the twice of artificial board thickness, accelerates the rate of release of wood-based plate formaldehyde in processing procedure to increase microwave action in the area of wood-based plate.
The microwave action chamber 3 of this equipment connects vavuum pump 14 and formaldehyde retracting device 15 successively by pipeline, vavuum pump 14 provides certain negative pressure and the formaldehyde gas that wood-based plate is produced in processing procedure enters formaldehyde retracting device 15 by closed conduit for inside, microwave action chamber 3, and the formaldehyde of recovery can as the raw material producing urea-formaldehyde resin adhesive after certain post-processed.
Claims (3)
1. microwave vacuum method reduces an equipment for artificial board formaldehyde burst size, it is characterized in that: the microwave action chamber (3) of this equipment is cylindrical shape, and level is installed; Be provided with charging hatch door (2) and the discharging hatch door (16) of spherical crown shape at the two ends in microwave action chamber, charging hatch door (2) and discharging hatch door (16) are respectively equipped with form (1); The left and right sides cylindrical wall that microwave action chamber (3) are inner is at least provided with equally distributed microwave feedback mouth (8) of a row along cylinder generatrix direction; Microwave feedback mouth (8) is connected with controller (11) with magnetron successively; Multiple temperature sensor (4) and a vacuum meter (13) are housed in microwave action chamber (3) inside; Temperature sensor (4), vacuum meter (13) are connected with controller (11) respectively; The bottom in microwave action chamber (3) is provided with guide rail (12), parks for material conveying trolley (7) and passes through, and material conveying trolley (7) is provided with the row's roller (6) placing wood-based plate (5); The microwave action chamber (3) of this equipment connects vavuum pump (14) and formaldehyde retracting device (15) successively by pipeline;
The microwave frequency of described equipment is 915MHz or 2450MHz;
Described charging hatch door (2) and discharging hatch door (16) are provided with screen layer and sealant;
Described controller (11) can to the display of temperature, vacuum and microwave input power, record and regulation and control;
Described formaldehyde retracting device (15) adopts the principle of washing to reclaim formaldehyde.
2. a kind of microwave vacuum method according to claim 1 reduces the equipment of artificial board formaldehyde burst size, it is characterized in that, row's roller (6) level on material conveying trolley (7) is installed, distance between adjacent two layers row roller is at least the twice of artificial board thickness, and the throughput direction of row's roller (6) is identical with cylinder generatrix direction.
3. a kind of microwave vacuum method according to claim 1 reduces the equipment of artificial board formaldehyde burst size, and it is characterized in that, described equipment is also suitable for the woodwork using urea-formaldehyde resin adhesive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510787578.0A CN105459240B (en) | 2015-11-17 | 2015-11-17 | The equipment that a kind of microwave vacuum method reduces artificial board formaldehyde burst size |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510787578.0A CN105459240B (en) | 2015-11-17 | 2015-11-17 | The equipment that a kind of microwave vacuum method reduces artificial board formaldehyde burst size |
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| Publication Number | Publication Date |
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| CN105459240A true CN105459240A (en) | 2016-04-06 |
| CN105459240B CN105459240B (en) | 2017-08-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510787578.0A Expired - Fee Related CN105459240B (en) | 2015-11-17 | 2015-11-17 | The equipment that a kind of microwave vacuum method reduces artificial board formaldehyde burst size |
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| CN (1) | CN105459240B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106078988A (en) * | 2016-08-02 | 2016-11-09 | 长沙源韵机械科技有限责任公司 | Accelerate the voltage pulse electric field processing device of the internal Form aldehyde release of artificial wooden sheet material |
| CN106808543A (en) * | 2017-01-09 | 2017-06-09 | 上海戊丰环保科技有限公司 | A kind of method of formaldehyde in use microwave removal wood-based plate |
| CN114451513A (en) * | 2022-01-07 | 2022-05-10 | 西北农林科技大学 | Method for degrading food endogenous formaldehyde by virtue of Glu-Cys solution soaking and coupled pulsed intense light |
Citations (4)
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| CN1280662A (en) * | 1997-10-30 | 2001-01-17 | 林业开发工业公司 | Method for drying saw timber and device for implementing said method |
| CN101318347A (en) * | 2008-07-01 | 2008-12-10 | 合肥溢新微波能科技有限公司 | Microwave energy artificial board processor |
| CN101439529A (en) * | 2008-12-23 | 2009-05-27 | 罗玉成 | Microwave vacuum drying and carbonizing device and method for wood |
| CN205219348U (en) * | 2015-11-17 | 2016-05-11 | 西北农林科技大学 | Microwave vacuum method reduces equipment of wood -based plate formaldehyde emission volume |
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2015
- 2015-11-17 CN CN201510787578.0A patent/CN105459240B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1280662A (en) * | 1997-10-30 | 2001-01-17 | 林业开发工业公司 | Method for drying saw timber and device for implementing said method |
| CN101318347A (en) * | 2008-07-01 | 2008-12-10 | 合肥溢新微波能科技有限公司 | Microwave energy artificial board processor |
| CN101439529A (en) * | 2008-12-23 | 2009-05-27 | 罗玉成 | Microwave vacuum drying and carbonizing device and method for wood |
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Non-Patent Citations (1)
| Title |
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| 高福成等: "《食品工程高新技术》", 30 April 2009 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106078988A (en) * | 2016-08-02 | 2016-11-09 | 长沙源韵机械科技有限责任公司 | Accelerate the voltage pulse electric field processing device of the internal Form aldehyde release of artificial wooden sheet material |
| CN106078988B (en) * | 2016-08-02 | 2017-09-15 | 长沙源韵机械科技有限责任公司 | Accelerate the voltage pulse electric field processing device of Form aldehyde release inside artificial wooden sheet material |
| CN106808543A (en) * | 2017-01-09 | 2017-06-09 | 上海戊丰环保科技有限公司 | A kind of method of formaldehyde in use microwave removal wood-based plate |
| CN106808543B (en) * | 2017-01-09 | 2018-06-29 | 上海戊丰环保科技有限公司 | A kind of method that formaldehyde in wood-based plate is removed using microwave |
| CN114451513A (en) * | 2022-01-07 | 2022-05-10 | 西北农林科技大学 | Method for degrading food endogenous formaldehyde by virtue of Glu-Cys solution soaking and coupled pulsed intense light |
| CN114451513B (en) * | 2022-01-07 | 2023-05-02 | 西北农林科技大学 | Method for degrading endogenous formaldehyde of food by immersing Glu-Cys solution and coupling pulse strong light |
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| CN105459240B (en) | 2017-08-08 |
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