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木屑烘干机的干燥工艺是怎么样的?

2019-07-29 来源:http://www.jianmosc.com 发布人:admin 浏览量:
  木材干燥技术是木材干燥机中木材干燥的重要技术手段。它直接影响木材的质量,减少木材的损耗。目前我国常用的干燥工艺主要有常规干燥、高温干燥、除湿干燥、太阳能干燥、真空干燥、高频微波干燥和烟气干燥。
  Wood drying technology is an important means of wood drying in wood dryer. It directly affects the quality of wood and reduces the loss of wood. At present, the common drying technologies in China are conventional drying, high temperature drying, dehumidification drying, solar drying, vacuum drying, high frequency microwave drying and flue gas drying.
  在上述干燥过程中。传统的干燥工艺在干燥机中常用,而且具有悠久的历史,成熟的干燥工艺。它能保证每次干燥的质量,并能实现大规模的工业干燥。这也是传统干燥工艺得到广泛应用的原因之一。
  In the above drying process. Traditional drying technology is commonly used in dryers, and has a long history, mature drying technology. It can ensure the quality of each drying, and can achieve large-scale industrial drying. This is also one of the reasons why traditional drying technology has been widely used.
  1. 传统的干燥过程
  1. Traditional drying process
  传统干燥工艺以常压湿空气为干燥介质,以蒸汽、热水、炉气或热油为加热介质,对空气进行间接加热。空气通过对流加热木材使其干燥。蒸汽加热是主要的加热方式。又称蒸汽干燥。市场上的干燥机一般都会采用这种干燥工艺。
  Traditional drying process uses atmospheric humid air as drying medium and steam, hot water, furnace gas or hot oil as heating medium to indirectly heat air. Air dries wood by convection heating. Steam heating is the main heating method. Also known as steam drying. This drying process is commonly used in dryers on the market.
  高温干燥法
  High temperature drying method
  高温干燥与常规干燥的区别主要体现在木材干燥机的干燥介质上。高温干燥温度远远高于常规干燥温度。干燥介质可以是湿空气或过热蒸汽。高温干燥的优点是干燥速度快,尺寸稳定性好,周期短,但高温干燥容易产生干燥缺陷,物料颜色深,表面硬化,不易加工。
  The difference between high temperature drying and conventional drying is mainly reflected in the drying medium of wood dryer. The high temperature drying temperature is much higher than the conventional drying temperature. The drying medium may be wet air or superheated steam. High temperature drying has the advantages of fast drying speed, good dimensional stability and short cycle, but high temperature drying is prone to produce drying defects, material color is deep, surface hardening, and difficult to process.
  太阳能干燥过程
  Solar drying process
  太阳能干燥是利用太阳辐射的热能对空气进行加热,利用热风在集热器和烟囱之间循环干燥木材。太阳能干燥一般有两种类型的温室式和集热器式,前者将集热器与干燥室合二为一,后者将集热器与干燥室分开布置。集热器式太阳能干燥室布局灵活,集热面积大,相应的干燥室容量大于温室式。虽然太阳能是一种清洁、廉价的能源,但它是受气候影响较大的间歇性能源,干燥周期长,单位体积投资大,因此太阳能的推广受到限制。
  Solar drying is the use of solar radiation of heat to heat the air, the use of hot air between the collector and chimney cycle drying wood. There are two types of solar drying: greenhouse type and collector type. The former combines the collector with drying chamber, and the latter separates the collector from drying chamber. The solar drying chamber of collector type has flexible layout and large heat collecting area, and the corresponding capacity of drying chamber is larger than that of greenhouse type. Although solar energy is a clean and inexpensive energy source, its promotion is limited because of its long drying cycle and large investment per unit volume.
木屑烘干机厂家
  真空干燥是木材在常压下干燥,干燥介质可以是湿空气,但大部分是过热蒸汽。在真空干燥过程中,木材内部和外部的水汽压差增大,加快了木材内部的水分转移速度。因此,干燥速度明显高于常规干燥,通常比常规干燥快3-7倍。同时,由于真空状态下水的沸点较低,在较低的干燥温度下可以达到较高的干燥速度、较短的干燥周期和较好的干燥质量。由于真空干燥系统复杂,投资大,功耗高,真空干燥能力一般较小,否则很难维持真空度。
  Vacuum drying is wood drying under atmospheric pressure. The drying medium can be wet air, but most of it is superheated steam. In the process of vacuum drying, the water vapor pressure difference between inside and outside of wood increases, which accelerates the water transfer speed inside wood. Therefore, the drying speed is obviously higher than that of conventional drying, usually 3-7 times faster than that of conventional drying. At the same time, due to the low boiling point of water in vacuum, higher drying speed, shorter drying cycle and better drying quality can be achieved at lower drying temperature. Because of the complexity of vacuum drying system, large investment, high power consumption, vacuum drying capacity is generally small, otherwise it is difficult to maintain vacuum.
  高频干燥工艺和微波干燥工艺
  High Frequency Drying Technology and Microwave Drying Technology
  高频干燥和微波干燥均以湿木材为介质。在交变电磁场作用下,木材中的水分子高速、频繁地旋转。水分子之间的摩擦产生热量,使木材从内到外同时受热和干燥。这两种干燥方法具有干燥速度快、内部温度场均匀、残余应力小、干燥质量好等特点。高频干燥与微波干燥的不同之处在于高频干燥具有频率低、波长长、木材渗透性强等特点,适用于干燥大截面厚木材。微波干燥频率高于高频(也称为uhf),但波长较短,干燥效率高于高频,但木材的穿透深度不如高频干燥。
  High frequency drying and microwave drying both use wet wood as medium. Under the action of alternating electromagnetic field, water molecules in wood rotate at high speed and frequently. Friction between water molecules produces heat, heating and drying wood from inside to outside at the same time. These two drying methods have the characteristics of fast drying speed, uniform internal temperature field, small residual stress and good drying quality. The difference between high frequency drying and microwave drying is that high frequency drying has the characteristics of low frequency, long wavelength and strong wood permeability, which is suitable for drying large cross-section thick wood. Microwave drying frequency is higher than high frequency (also known as uhf), but the wavelength is shorter, drying efficiency is higher than high frequency, but the penetration depth of wood is lower than high frequency drying.
  除上述干燥工艺外,还有其他干燥工艺,如红木行业的上蜡工艺,严格意义上来说,这并不是一个干燥工艺。它是一种稳定木材性能、防止木材干燥开裂的技术。并不是每一种木材都需要煮石蜡,石蜡箱是不同的,可以起到木材干燥的作用,但是由于干燥木材的厚度和密度不同,对贮罐的需求也不一样,所以在使用过程中成本可能会更高。目前应用于实木领域,由于技术难度相对较高,仍在不断完善中。
  In addition to the above drying process, there are other drying processes, such as waxing process in mahogany industry. Strictly speaking, this is not a drying process. It is a technology for stabilizing wood properties and preventing wood from drying and cracking. Not every kind of wood needs to be boiled with paraffin. Paraffin boxes are different and can play a role in wood drying. However, due to the different thickness and density of the dried wood, the demand for storage tanks is also different, so the cost may be higher in the use process. At present, it is applied in the field of solid wood. Because of its relatively high technical difficulty, it is still in the process of continuous improvement.
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