1. Main types and principles of fruit and vegetable dryers
The fruit and vegetable dryer is an efficient, healthy and convenient fruit and vegetable processing equipment. Compared with traditional sun or air drying, the fruit and vegetable dryer is faster, more uniform and hygienic.
Fruit and vegetable dryers usually have the following main types:
1. Hot air circulation dryer
This is one of the most common types of fruit and vegetable dryers. It uses an electric heater or a gas heater to generate hot air and circulates the hot air into the drying chamber through a fan. Hot air flows through the fruits and vegetables, taking away moisture to achieve drying.
2. Solar dryer
The solar dryer uses solar energy to convert sunlight into heat energy, and sends hot air into the drying room through natural convection or auxiliary fans. This type of dryer is very popular in sunny areas because they use renewable energy for drying.
3. Microwave dryer
Microwave dryer uses microwave radiation to heat the water molecules inside fruits and vegetables, causing them to quickly evaporate. This type of dryer is efficient and fast, and can better retain the color and nutrients of fruits and vegetables.
Each type of fruit and vegetable dryer is based on a different working principle:
1. Hot air circulation dryer
uses hot air and the convection and flow of hot air to take away the moisture in fruits and vegetables.
2. Solar dryer
Use solar energy to convert light energy into heat energy, generate hot air and circulate it through convection, thereby removing moisture from fruits and vegetables.
3. Microwave dryer
Microwave dryer uses microwave radiation to heat the water molecules inside fruits and vegetables, causing them to quickly evaporate.
2. Types of industrial burners
The industrial burner used in fruit and vegetable dryers in this article mainly refers to hot air circulation dryers.
Common industrial burners can be divided intooil burners, gas burners, methanol burners, hydrogen burners, dual fuel burners, biomass burners, etc. according to different fuels.
According to the flame temperature, it can be divided into: low temperature burner and high temperature burner.
After a long period of development, most of these burners can control the flame length and temperature, and can be customized for specific machines. Most burners are also equipped with PLC operating system, making use more convenient.
During the drying process of fruits and vegetables, the unpleasant combustion exhaust gas generated by the burner cannot be mixed into the product, which will cause the quality of the product to decline. This results in most industrial burners being less than ideal, with electric heaters and gas heaters being the first choice for most companies.
3. How to choose industrial burners for fruit and vegetable dryers
1. Make choices through energy sources such as fuel.
Select industrial burners with corresponding functions according to the specific energy used, such as gas, fuel, electricity, etc. But among these three energy sources, the fuel cost is: electricity > fuel > gas. Appropriate choices need to be made based on the factory’s production volume to fundamentally reduce costs.
2. Temperature control capability.
A very important function of the dryer is that it can ensure that the ingredients are heated and dried at the appropriate temperature to achieve the best drying effect. It is very important to choose a burner that can accurately control the flame length and temperature. It can cooperate well with the dryer and prevent uneven temperature during the production process.
4. There may be several reasons for the uneven drying and wetness of the fruit and vegetable dryer during the drying process.
1. Improper distribution
If you place fruits and vegetables on the same layer or in the same position in the dryer without proper distribution, it will lead to uneven drying and wetness. Make sure you distribute fruits and vegetables evenly throughout the dryer's layers and locations to promote air circulation and achieve even drying results.
2. Uneven temperature and humidity
The temperature and humidity distribution inside the dryer may be uneven, which may be caused by dryer design issues or improper operation. Check that the dryer has good temperature and humidity control and follow correct operating procedures to ensure even temperature and humidity distribution.
3. Insufficient drying time
If the fruits and vegetables are not dried for enough time, or the dryer is set for too short a time, some parts may not be fully dried. Make sure to provide enough time for fruits and vegetables to dry, and adjust drying time according to the type and size of fruits and vegetables.
4.Blockage inside the dryer
There may be a blockage inside the dryer that is blocking the flow of air and the removal of moisture. 4. Clean the filter, air outlet and other vents inside the dryer regularly to ensure good air circulation.
If you encounter problems with uneven drying and wetness, try to solve the above problems and make appropriate adjustments. If the problem persists, you may need to contact a professional service person for inspection and repair.
If you encounter any problems with the burner of your fruit and vegetable dryer, you can consult us and we will answer you as soon as possible. We are BNTET Burner, a professional burner manufacturer.
