CN110940180A - Device and method for drying wood fibers at low temperature - Google Patents

Device and method for drying wood fibers at low temperature Download PDF

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Publication number
CN110940180A
CN110940180A CN201911084352.9A CN201911084352A CN110940180A CN 110940180 A CN110940180 A CN 110940180A CN 201911084352 A CN201911084352 A CN 201911084352A CN 110940180 A CN110940180 A CN 110940180A
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China
Prior art keywords
drying
pipe
temperature
wood fibers
air
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Pending
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CN201911084352.9A
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Chinese (zh)
Inventor
朱瑞东
曹海峰
李意
赖锡谅
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Guangdong Qianhong Wood Industry Co Ltd
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Guangdong Qianhong Wood Industry Co Ltd
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Priority to CN201911084352.9A priority Critical patent/CN110940180A/en
Publication of CN110940180A publication Critical patent/CN110940180A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
    • F26B21/35—
    • F26B21/37—
    • 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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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

The invention relates to the technical field of artificial fiber boards, and discloses a device for drying wood fibers at a low temperature, which comprises an air inlet pipe and a drying pipe connected to the air inlet pipe, wherein the air inlet pipe is also connected with a boiler flue gas inlet pipe, and a drying fan for driving airflow to advance is arranged in the drying pipe; still include the controller, be equipped with the electronic air regulation valve who is used for controlling the air admission volume in the intake pipe, the import department of drying tube is equipped with import temperature-detecting device, the exit of drying tube is equipped with export temperature-detecting device, be connected with the converter on the drying fan, the controller with electronic air regulation valve, import temperature-detecting device, export temperature-detecting device and converter electric connection. The invention also provides a low-temperature drying method for the wood fibers, which can be used for efficiently drying the wood by utilizing the boiler flue gas, and is energy-saving, environment-friendly and high in drying efficiency.

Description

Device and method for drying wood fibers at low temperature
Technical Field
The invention relates to the technical field of artificial fiber boards, in particular to a device and a method for drying wood fibers at low temperature.
Background
In the production of artificial fiber boards, a common fiber drying system dries glued wood fibers at a high temperature of 170-200 ℃, so that the glue is cured in advance when the glued wood fibers are dried by a high-temperature heat source, the performance of the wood fibers is damaged, the initial viscosity of the glued wood fibers is poor after drying, the softness of the wood fibers is insufficient, and the quality of the glued wood fibers is seriously influenced. Meanwhile, too high drying temperature can cause fire easily in the drying system, which is not beneficial to production safety.
Patent CN201483612U discloses a wood fiber low-temperature drying device (application No. 200920140922.7) which dries wood fibers by boiler flue gas, can dry wood fibers by gas with a temperature below 150 ℃, improves the drying speed of wood fibers, and can recycle the waste heat of boiler flue gas. However, it is difficult to monitor the drying effect of the wood fibers in real time and to maintain the drying effect of the wood fibers stably.
Disclosure of Invention
The invention aims to provide a device for drying wood fibers at low temperature, which has high automation degree and can dry the wood fibers efficiently and stably.
In order to achieve the aim, the invention provides a device for drying wood fibers at a low temperature, which comprises an air inlet pipe and a drying pipe connected to the air inlet pipe, wherein the air inlet pipe is also connected with a boiler flue gas inlet pipe, and a drying fan used for driving air flow to advance is arranged in the drying pipe;
still include the controller, be equipped with the electronic air regulation valve who is used for controlling the air admission volume in the intake pipe, the import department of drying tube is equipped with import temperature-detecting device, the exit of drying tube is equipped with export temperature-detecting device, be connected with the converter on the drying fan, the controller with electronic air regulation valve, import temperature-detecting device, export temperature-detecting device and converter electric connection.
Preferably, the length of the drying tube is 140m to 170 m.
The invention also provides a method for drying the wood fibers at low temperature, which has high automation degree and can efficiently and stably control the drying process of the wood fibers, the device is adopted for drying, the length of the drying pipe is 155 meters, the diameter of the drying pipe is 2.45 meters, the maximum flow of the wood fibers entering the drying pipe is 24t/h, the air volume of a drying fan is 60 ten thousand meters and year/h, the temperature at the inlet of the drying pipe is 110-140 ℃, the temperature at the outlet of the drying pipe is 65 +/-5 ℃, the air speed in the drying pipe is 35m/s, the air pressure is 6000Pa, and the drying time for the wood fibers is 4-6 seconds.
The invention provides a device for drying wood fibers at low temperature, which has the following beneficial effects:
1. the degree of automation is high, the air intake of the boiler flue gas can be automatically adjusted by detecting the temperature at the inlet and the outlet of the drying pipe, and the degree of automation is improved;
2. the temperature at the inlet and the outlet of the drying tube is dynamically and automatically adjusted by automatically controlling the gas inflow of the flue gas in the drying tube, so that the stability of the drying effect of the wood fiber is improved;
3. can adjust through the amount of wind to the drying blower in the drying tube, can be through the drying effect of control amount of wind to timber fibre.
The invention provides a method for drying wood fibers at low temperature, which has the following beneficial effects:
1. the quality of the wood drying process can be dynamically controlled by controlling various parameters of the device for drying the wood fibers at the low temperature;
2. various parameters of the wood fiber drying device are accurately controlled, so that the wood fiber is ensured to have excellent drying effect within the drying time of 4 to 6 seconds, and the drying efficiency of the wood fiber is improved;
3. the drying effect of the wood fiber reaches the final water content (relative water content) of 10 +/-2%, and the drying effect on the wood fiber is excellent.
Drawings
FIG. 1 is a schematic view of a system configuration of an apparatus for low-temperature drying of wood fibers in an embodiment of the present invention;
fig. 2 is a schematic side view of an electric air volume adjusting valve in the embodiment of the present invention;
fig. 3 is a schematic front view of an electric air volume adjusting valve in the embodiment of the invention;
FIG. 4 is a schematic front view of a drying duct according to an embodiment of the present invention;
FIG. 5 is a schematic cross-sectional view of a drying duct in an embodiment of the present invention;
FIG. 6 is a schematic diagram of a control structure in an embodiment of the present invention;
in the figure, 10, an air inlet pipe; 20. a drying tube; 21. an inlet temperature detection device; 22. an outlet temperature detection device; 30. a boiler flue gas inlet pipe; 40. a drying fan; 41. a frequency converter; 50. a controller; 51. an electric air volume adjusting valve; 52. an electric actuator; 53. a bearing; 54. rotating the rod; 55. a blade; 56. a first link; 57. a second link; 58. and (5) fixing the rod.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Based on above-mentioned technical scheme, as shown in fig. 1 to fig. 6, the device for drying wood fiber at low temperature provided in this embodiment includes intake pipe 10 and drying tube 20 connected to intake pipe 10, still is connected with boiler flue gas intake pipe 30 on intake pipe 10, and boiler flue gas intake pipe 30 is used for letting in the higher hot gas flow of temperature for dry wood fiber. The drying tube 20 is circular in cross-section to facilitate passage of the wood fibers.
Wherein, be equipped with in the drying tube 20 and be used for driving the drying fan 40 that the air current gos forward, drying fan 40 drives the hot gas flow, forms the malleation in drying tube 20 to carry out the drying to the timber fibre.
As shown in fig. 6, the drying device further includes a controller 50, an electric air volume adjusting valve 51 for controlling the air inlet volume is disposed on the air inlet pipe 10, an inlet temperature detecting device 21 is disposed at an inlet of the drying pipe 20, an outlet temperature detecting device 22 is disposed at an outlet of the drying pipe 20, a frequency converter 41 is connected to the drying fan 40, and the controller 50 is electrically connected to the electric air volume adjusting valve 51, the inlet temperature detecting device 21, the outlet temperature detecting device 22, and the frequency converter 41.
As shown in fig. 2 and 3, the electric air volume adjusting valve 51 includes an electric actuator 52, the electric actuator 52 may be a servo motor, a rotary table is connected to the electric actuator 52, a first connecting rod 56 is hinged to the rotary table, a second connecting rod 57 is hinged to the first connecting rod 56, a fixing rod 58 is hinged to the second connecting rod 57, the second connecting rod 57 is hinged to an end of the fixing rod 58, the fixing rod 58 is rotatably connected to a fixing frame of the drying duct through a bearing 53, a rotating rod 54 is fixedly connected to the fixing rod 58, and a blade 55 is fixedly connected to the rotating rod 54 between the two bearings 53 at the end of the fixing rod 58.
The air volume working process of the electric air volume adjusting valve 51 is as follows: when the electric actuator 52 rotates, the first connecting rod 56 is driven to rotate, the fixing rods 58 and the rotating rod 54 are driven by the first connecting rod 56 to open and close the blades 55, the fixing rods 58 are linked to rotate through the second connecting rod 57, and meanwhile the second connecting rod 57 is driven to rotate, so that the blades 55 are linked, and the whole electric air volume adjusting valve 51 is opened and closed under the control of the electric actuator 52.
The electric actuator 52 is electrically connected to the controller 50, and the controller 50 can control the rotation angle of the servo motor serving as the electric actuator 52, so that the controller 50 can control the opening and closing amplitude of each blade 55, and further control the air inlet amount to realize automatic control.
As shown in fig. 1, after the controller 50 receives the temperature signals of the inlet temperature detecting device 21 and the outlet temperature detecting device 22, the electric air volume adjusting valve 51 and the frequency converter 41 are adjusted to appropriate values through processing and feedback control, so that the temperatures at the inlet and the outlet of the drying pipe 20 are accurately controlled, and the degree of automation control over the drying system is improved.
Preferably, as shown in fig. 1, the length L of the drying duct 20 is 140m to 170m, and particularly, the length L of the drying duct 20 may be 140m, 145m, 150m, 155m, 160m, 165m, or 170 m.
Specifically, as shown in fig. 4 and 5, the cross section of the drying duct 20 is circular, and the drying duct 20 is fixedly installed on the ground through a bracket.
Preferably, the wood fibers are fed into the drying tube 20 by steam pressure, and during the drying process, the wet fibers are impacted by a high velocity stream of hot air in a normal pressure tunnel, causing the agglomerated fibers to disperse into a suspension. The entire surface of the fiber is exposed to the hot air flow medium, and the hot medium is continuously updated at a high speed, so that the heat conduction efficiency of the wet fiber and the hot medium is greatly improved, the drying process is strengthened, and the drying is completed in a short time.
Preferably, the maximum flow of wood fibres into the drying tunnel is 24t/h to ensure a drying effect on the wood fibres.
The parameters of the wood fiber drying process are as follows: the length of the drying tube 20 is 155m, the tube diameter of the drying tube 20 is 2.45 m, and the tube diameter of the drying tube 20 may be 2.4m, 2.35m, 2.45 m, 2.5m, 2.55m, or 2.6 m.
Specifically, the air volume of the drying fan 40 is 60 ten thousand meters for dry harvest/h, the temperature at the inlet of the drying tube 20 is 110 to 140 ℃, and the temperature at the inlet of the drying tube 20 can be 110 ℃, 115 ℃, 120 ℃, 125 ℃, 130 ℃, 135 ℃ or 140 ℃.
Specifically, the temperature at the outlet of the drying tube 20 is 65 +/-5 ℃, and the temperature at the outlet of the drying tube 20 can be 60 ℃, 61 ℃, 62 ℃, 63 ℃, 64 ℃ or 65 ℃;
specifically, the air speed in the drying duct 20 is 35m/s, and the air speed in the drying duct 20 may be 32 m/s, 33 m/s, 34m/s, 36 m/s, 37 m/s, or 38 m/s.
Specifically, the wind pressure is 6000Pa, and the wind pressure may be 6100Pa, 6200Pa, 6300Pa, 6400Pa, 6600Pa, 6700Pa, 6800Pa, or 6900 Pa.
Specifically, the drying time for the wood fibers is 4 to 6 seconds, and the drying time may be 4 seconds, 4.5 seconds, 5 seconds, 5.5 seconds, or 6 seconds.
According to the drying method, the wood fiber is dried, and the test result of the final water content shows that the final water content (relative water content) reaches 10 +/-2%, wherein the relative water content is the percentage of the mass of the water contained in the fiber to the mass of the wet fiber, the standard of hot pressing of the wood fiber is achieved, and the fiber board made of the wood fiber has excellent performance and excellent hot pressing effect.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims (3)

1.一种木材纤维低温干燥的装置，其特征在于，包括进气管（10）和连接在进气管（10）上的干燥管（20），所述进气管（10）上还连接有锅炉烟气进气管（30），所述干燥管（20）中设有用于驱动气流前进的干燥风机（40）；1. A device for low-temperature drying of wood fibers, characterized in that it comprises an air inlet pipe (10) and a drying pipe (20) connected to the air inlet pipe (10), and the air inlet pipe (10) is also connected with boiler smoke an air intake pipe (30), wherein a drying fan (40) for driving the air flow forward is provided in the drying pipe (20); 还包括控制器（50），所述进气管（10）上设有用于控制空气进入量的电动风量调节阀（51），所述干燥管（20）的进口处设有进口温度检测装置（21），所述干燥管（20）的出口处设有出口温度检测装置（22），所述干燥风机（40）上连接有变频器（41），所述控制器（50）与所述电动风量调节阀（51）、进口温度检测装置（21）、出口温度检测装置（22）和变频器（41）电性连接。It also includes a controller (50), the air intake pipe (10) is provided with an electric air volume regulating valve (51) for controlling the amount of air entering, and an inlet temperature detection device (21) is provided at the inlet of the drying pipe (20). ), an outlet temperature detection device (22) is provided at the outlet of the drying pipe (20), a frequency converter (41) is connected to the drying fan (40), and the controller (50) is connected to the electric air volume The regulating valve (51), the inlet temperature detection device (21), the outlet temperature detection device (22) and the frequency converter (41) are electrically connected. 2.如权利要求1所述的木材纤维低温干燥的装置，其特征在于，所述干燥管（20）的长度为140m至170m。2 . The device for low-temperature drying of wood fibers according to claim 1 , wherein the length of the drying pipe ( 20 ) is 140m to 170m. 3 . 3.一种使用权利要求1或2所述的装置的木材纤维低温干燥方法，其特征在于，干燥管（20）长度为155米，干燥管（20）的管直径为2.45米，木材纤维量进入干燥管（20）的最大流量是24t/h，干燥风机（40）风量为60万m ³ /h，干燥管（20）入口处温度为110至140℃，干燥管（20）出口处温度为65±5℃，干燥管（20）中的风速为35m/s，风压为6000Pa，对木材纤维的干燥时间为4至6秒。3. A low-temperature drying method for wood fibers using the device according to claim 1 or 2, characterized in that, the length of the drying pipe (20) is 155 meters, the pipe diameter of the drying pipe (20) is 2.45 meters, and the amount of wood fibers is 2.45 meters. The maximum flow rate entering the drying pipe (20) is 24t/h, the air volume of the drying fan (40) is 600,000 m³/h, the temperature at the inlet of the drying pipe (20) is 110 to 140°C, and the temperature at the outlet of the drying pipe (20) The temperature is 65±5°C, the wind speed in the drying pipe (20) is 35m/s, the wind pressure is 6000Pa, and the drying time for the wood fiber is 4 to 6 seconds.
CN201911084352.9A 2019-11-07 2019-11-07 Device and method for drying wood fibers at low temperature Pending CN110940180A (en)

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CN201911084352.9A CN110940180A (en) 2019-11-07 2019-11-07 Device and method for drying wood fibers at low temperature

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Application Number Priority Date Filing Date Title
CN201911084352.9A CN110940180A (en) 2019-11-07 2019-11-07 Device and method for drying wood fibers at low temperature

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113758230A (en) * 2021-08-16 2021-12-07 上海人造板机器厂有限公司 Automatic control method and system for drying of gas furnace
CN116857941A (en) * 2023-07-07 2023-10-10 山东优尼亚农业机械有限公司 Fire disaster early warning device suitable for grain drying equipment
CN118836662A (en) * 2024-09-20 2024-10-25 邵阳纺织机械有限责任公司 Vertical drying room for glass fiber sewing thread

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5174042A (en) * 1990-08-20 1992-12-29 Matsushita Electric Industrial Co., Ltd. Garbage disposer utilizing microwave heating
CN201483612U (en) * 2009-06-05 2010-05-26 广西丰林木业集团股份有限公司 Wood fiber low temperature drying device
CN201688675U (en) * 2010-05-19 2010-12-29 大亚科技股份有限公司 Fiber drying flue gas temperature control device
CN202719860U (en) * 2012-07-26 2013-02-06 大亚木业（肇庆）有限公司 Thermal induced draught fan system
CN109318339A (en) * 2018-11-07 2019-02-12 广西横县丽冠人造板有限责任公司 Method for producing medium density fiberboard from wood waste

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5174042A (en) * 1990-08-20 1992-12-29 Matsushita Electric Industrial Co., Ltd. Garbage disposer utilizing microwave heating
CN201483612U (en) * 2009-06-05 2010-05-26 广西丰林木业集团股份有限公司 Wood fiber low temperature drying device
CN201688675U (en) * 2010-05-19 2010-12-29 大亚科技股份有限公司 Fiber drying flue gas temperature control device
CN202719860U (en) * 2012-07-26 2013-02-06 大亚木业（肇庆）有限公司 Thermal induced draught fan system
CN109318339A (en) * 2018-11-07 2019-02-12 广西横县丽冠人造板有限责任公司 Method for producing medium density fiberboard from wood waste

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113758230A (en) * 2021-08-16 2021-12-07 上海人造板机器厂有限公司 Automatic control method and system for drying of gas furnace
CN113758230B (en) * 2021-08-16 2022-12-13 上海人造板机器厂有限公司 Automatic control method and system of gas furnace for drying artificial board fibers
CN116857941A (en) * 2023-07-07 2023-10-10 山东优尼亚农业机械有限公司 Fire disaster early warning device suitable for grain drying equipment
CN118836662A (en) * 2024-09-20 2024-10-25 邵阳纺织机械有限责任公司 Vertical drying room for glass fiber sewing thread

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Application publication date: 20200331