目前，农业、食品 、化工、制陶业、医药、矿产加工、制浆造纸、木材加工等行业，所有生产过程几乎都要用到干燥，干燥物料的质量取决于是否很好的控制恒定的温度。而微波烘干技术是一种先进、快捷的干燥方式，更适合大部分农产品、药材等热敏性物料的干燥。
At present, almost all production processes in industries such as agriculture, food, chemical, pottery, medicine, mineral processing, pulp and paper making, and wood processing require drying. The quality of dried materials depends on whether the constant temperature is well controlled. Microwave drying technology is an advanced and fast drying method, which is more suitable for drying most heat sensitive materials such as agricultural products and medicinal herbs.
目前，传统干燥和微波干燥是最主流的两种干燥技术。
传统干燥技术的特点：传统加热是通过传导、对流和辐射方式进行，在真空状态下空气对流难以进行，只有通过传导方式给物料提供热能，干燥的膏状物料表面先干燥而硬化，形成”坚实”的外壳，外部的热很难进去，内部的水份很难排出，因此，干燥速度慢、效益低、周期长、温度不易控制，直接影响物料的干燥质量。
微波干燥技术的特点：微波干燥是物料在微波场中吸收微波能后自身整体生热，加热速度快，热能分布均匀，水份很快排出，克服了传统加热能量从外向内逐步加热，形成外部温度高，内部温度低，外干内湿的问题。
At present, traditional drying and microwave drying are the two most mainstream drying technologies.
The characteristics of traditional drying technology: Traditional heating is carried out through conduction, convection, and radiation, and air convection is difficult to carry out in a vacuum state. Only through conduction can thermal energy be provided to the material. The surface of the dried paste like material first dries and hardens, forming a “solid” outer shell. External heat is difficult to enter, and internal water is difficult to discharge. Therefore, the drying speed is slow, the efficiency is low, the cycle is long, and the temperature is difficult to control, directly affecting the drying quality of the material.
The characteristics of microwave drying technology: Microwave drying is the overall heat generation of materials after absorbing microwave energy in the microwave field. The heating speed is fast, the heat energy distribution is uniform, and the water is quickly discharged. It overcomes the problem of traditional heating energy gradually heating from the outside to the inside, resulting in high external temperature, low internal temperature, and dry outside and wet inside.
微波干燥能直接作用于介质分子转换成热能，由于微波具有穿透性能使介质内外同时加热，不需要热传导，所以加热速度非常快，对含水量较少的物料，干燥速度更是大大缩短。不管物体任何形状，物体的介质能够内外同时加热，物料的内外温差小，加热均匀， 不会产生常规加热中出现外焦内生的状况，从而使干燥质量大大提高。
Microwave drying can directly act on the molecules of the medium to convert them into heat energy. Due to the penetrating properties of microwaves, they can heat both inside and outside the medium without the need for thermal conduction. Therefore, the heating speed is very fast, and for materials with low water content, the drying speed is greatly reduced. Regardless of the shape of the object, the medium of the object can be heated both inside and outside simultaneously. The temperature difference between the inside and outside of the material is small, and the heating is uniform, without the occurrence of external coke and internal coke in conventional heating, thereby greatly improving the drying quality.
微波干燥与传统干燥技术对比 Comparison between microwave drying and traditional drying techniques
| 传统干燥(Traditional drying) | 微波干燥(Microwave drying) | |
| 工作原理(Working principle) | 热传导方式，由外向内加热(Heat conduction mode, heating from the outside in) | 微波直接作用于水分子，内外同时加热，损耗小(Microwave directly acts on water molecules, heating both inside and outside simultaneously with low loss) |
| 干燥时间(drying time) | 三天、一周、或者更长时间(Three days, one week, or longer) | 几分钟、十几分钟(A few minutes, a dozen or so minutes) |
| 干燥效果(Drying effect) | 很难达到100%干燥，难控温(It is difficult to achieve 100% drying and temperature control) | 直接对水分子作用100%干燥、易控温(Directly acting on water molecules, 100% dry, easy to control temperature) |
| 干燥均匀性(Drying uniformity) | 不均匀(Uneven) | 选择性加热、干燥均匀(Selective heating and uniform drying) |
| 品质、品相(Quality and appearance) | 易变色、变形、板结(Easy to change color, deform, and harden) | 可提高物料品质(Can improve material quality) |
| 能源(energy) | 热传导、煤或天然气-热能(Heat conduction, coal or natural gas – thermal energy) | 电能-微波能-热能，能量转化率高(Electric energy microwave energy thermal energy, high energy conversion rate) |
| 能源利用率(Energy utilization rate) | 能量利用率小，浪费多(Low energy utilization rate and high waste) | 比传统方式节能40%以上(More than 40% energy-saving compared to traditional methods) |
| 环保卫生(Environmental protection and hygiene) | 煤、油、天然气污染严重(Serious pollution from coal, oil, and natural gas) | 无任何污染(No pollution) |
| 工作环境(work environment) | 劳动强度大，扬尘严重，工作环境恶劣(High labor intensity, severe dust emission, and harsh working environment) | 自动辅料，密封无扬尘，优化工作环境，减少工人数量和劳动强度，操作简易(Automatic auxiliary materials, sealed without dust, optimized working environment, reduced number of workers and labor intensity, easy operation) |
工业微波干燥设备三大特点 Three major characteristics of industrial microwave drying equipment
1、效率高
传统干燥由10%含水量脱至1%以下需十几个小时，采用微波干燥仅需10+分钟；
传统干燥由5%含水量脱至1%以下需六至七小时，采用微波干燥仅需几分钟；
传统干燥由30%-20%含水量脱至1%以下需二十几小时，采用微波干燥仅用20分钟左右。
工业微波干燥设备能即开即用,没有常规热力干燥的热惯性,操作灵活方便,微波功率可调,传输速度从零开始连续可调,便于操作。
2、物料原色好
由于微波干燥不需要热传导，物料自身发热，干燥速度快，接触物料的温度大大低于常规方法，不会造成物料裂变现象。
3、智能化
与常规方法相比，微波设备不需要锅炉、复杂的管道系统，煤场和运输车辆，只要具备水，电基本条件即可。相比而言，一般可节电30％-50％。
- High efficiency
Traditional drying takes more than ten hours to reduce the moisture content from 10% to below 1%, while microwave drying only takes 10+minutes;
Traditional drying takes six to seven hours to reduce the moisture content from 5% to below 1%, while microwave drying only takes a few minutes;
Traditional drying takes more than 20 hours to reduce the moisture content from 30% -20% to below 1%, while microwave drying only takes about 20 minutes.
Industrial microwave drying equipment can be used immediately, without the thermal inertia of conventional thermal drying. It is flexible and convenient to operate, with adjustable microwave power and continuously adjustable transmission speed from zero, making it easy to operate.
- Good raw material color
Due to the fact that microwave drying does not require thermal conduction, the material itself generates heat, the drying speed is fast, and the temperature of contact with the material is significantly lower than that of conventional methods, which will not cause material fission.
- Intelligence
Compared with conventional methods, microwave equipment does not require boilers, complex pipeline systems, coal yards, and transportation vehicles, as long as it has basic conditions for water and electricity. Compared to others, it can generally save 30% -50% of electricity.
麦克威工业微波加热设备优势 Advantages of Macwell Industrial Microwave Heating Equipment
1、加热速度快
微波加热与传统加热方式完全不同。它是使被加热物料本身成为发热体，不需要热传导的过程。因此，尽管是热传导性较差的物料，也可在极短的时间内达到加热温度。
2、节能高效
由于含有水分的物质容易吸收微波而发热，因此除少量的传输损耗外，几乎无其它损耗，故热效率高、节能。
- Fast heating speed
Microwave heating is completely different from traditional heating methods. It is the process of making the heated material itself a heating element without the need for heat conduction. Therefore, even materials with poor thermal conductivity can reach the heating temperature in an extremely short time.
- Energy saving and high efficiency
Due to the fact that substances containing moisture are prone to absorbing microwaves and generating heat, there are almost no other losses except for a small amount of transmission loss, resulting in high thermal efficiency and energy conservation.
3、加热均匀
无论物体各部位形状如何，微波加热均可使物体表里同时均匀渗透电磁波而产生热能。所以加热均匀性好，不会出现外焦内生现象。
4、防霉、杀菌、保鲜
微波加热具有热力和生物效应，能在较低温度下灭菌和防霉。由于加热速度快、时间短，能较大限度地保存物料的活性和食品中的维生素、原有的色泽和营养成份。
5、工艺先进、易控制
微波加热只需有水、电的基本条件，只要控制微波功率即可实现立即加热或终止，应用微波机可进行加热过程和加热工艺规范的自动化控制。
6、占地面积少，安全无害
由于微波能是控制在金属制成的加热室内和波导管中工作，所以微波泄漏极少，没有放射线危害及有害气体排放，不产生余热和粉尘污染；既不污染食物，也不污染环境。
- Uniform heating
Regardless of the shape of various parts of an object, microwave heating can uniformly penetrate electromagnetic waves into the surface and generate thermal energy. So the heating uniformity is good, and there will be no phenomenon of external focus and internal generation.
- Anti mold, sterilization, and preservation
Microwave heating has thermal and biological effects, which can sterilize and prevent mold at lower temperatures. Due to its fast heating speed and short duration, it can effectively preserve the activity of materials and the vitamins, original color, and nutritional components in food.
- Advanced technology and easy control
Microwave heating only requires basic conditions of water and electricity. As long as the microwave power is controlled, immediate heating or termination can be achieved. The application of microwave machines can automate the heating process and heating process specifications.
- Small footprint, safe and harmless
Due to the fact that microwave energy operates in metal heating chambers and waveguides, microwave leakage is minimal, with no radiation hazards or harmful gas emissions, and no waste heat or dust pollution is generated; It neither pollutes food nor the environment.