Selection of drying equipment
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One of our company’s products (an intermediate, 50 T/month) is acidic; its humidity after centrifugation is between 30% and 40% (centrifuging it is very difficult). Its viscosity is extremely high. Currently, hot air circulation drying is used, but this results in large amounts of waste gas, causing significant environmental impact and serious energy waste. However, this material comes in both lump form and granular form. There are challenges: 1. Bulk or granular form ------- infrared and microwave drying cannot be used. 2. Humidity of 30–40% ------- it cannot be crushed (boiling drying is not possible). 3. Very high viscosity ---------- conical dryers cannot be used. 4. Freeze-drying requires high investment and consumes a lot of energy. I hope those of you who have extensive experience can recommend a drying device that can be used for this purpose~! Thank you! Thank you! Thank you again! ! ! !
I’m not sure if a tray dryer is appropriate. Main working principle: 1. The material falls downward due to gravity through the distribution opening at the top, landing on the first disk. As the disk rotates, the material is continuously spread out and then pushed onto the disk below. 2. Below each disk is a heating coil, which provides uniform heating. 3. Based on the properties of the material, the rotation speed of the disks, the number of disks, and the heat generated are determined through calculations. 4. The lower part of the dryer is the outlet, from where the dried material is obtained. 5. The evaporated waste gas also needs to be treated at the upper part. For reference!
I don’t know whether the material will be in powder form or some other form after it dries. Can a jacketed screw agitator tank be used? Steam or heat transfer oil is used in the jacket to continuously heat the spiral strips; a vacuum is created inside the tank, and the exhaust port of the vacuum pump is connected to a condensation recovery unit for the condensation and recovery of waste gases. The stirring speed should be controlled at around 15 r/min. It can be controlled using frequency conversion.
Process issues... Fix that damn process first, and then we can decide on the damn dryer....
Can spray granulation and rotary drying be used; or pneumatic drying with fluidization?
It is recommended to use an internally heated vibrating fluidized bed for drying
The resulting material can be either powdered or chunky (although it is mostly in a powdered form after drying, with only a small amount in a chunky form); what matters is whether it is dry or wet
It seems there is a type of tubular dryer now; I’m not sure if it would be suitable
Could spray drying be considered?
I have the same problem. Could you explain whether using freeze-drying guarantees there will be no issues?
This issue has been resolved! First, microwave drying is used to reduce the moisture content to 8%~15% (accelerated tests showed no effect on this intermediate), followed by grinding and then boiling drying, thereby meeting the requirements for moisture content of this intermediate!
It is recommended to use an internally heated vibrating fluidized bed for drying
It’s not a tubular dryer; it’s a counterflow dryer. However, it isn’t effective; counterflow is suitable for drying granular materials. I personally recommend wet grinding followed by spray drying.
Disk drying can be used, and there is a type of disk drying that recovers solvents. But the prerequisite for using a dry tray is that the material does not stick to it; I’m not sure about the properties of your material.
Dry or spray dry using an internal heat type vibrating fluidized bed; exhaust gas is cooled and recovered via wet methods or bag filters! ! I’ve used disc types, and they’re not good – both the feeding and discharge areas tend to get clogged
I wonder if your material is in a liquid state at the beginning, and whether a small spray dryer can be used for drying it.
For materials with high viscosity, a hollow-blade dryer is used; it features double spiral blades and is ideal for drying viscous materials. For materials with a wide range of moisture contents, a two-stage blade dryer can be employed. Given the low production volume, the investment in such equipment is not very high. For more details, please contact QQ: 285945270. This post was last edited by dongsaili on 2008-12-10 at 22:32.]
A biaxial screw vacuum drying machine can be used to solve this problem; such machines are already in use in some companies in Japan. Currently, some domestic dryer manufacturers also produce such products, and information about them has been available before – one can look up that material. I think this device is the most suitable.
Paddle dryers are effective for processing viscous materials, as both the container and the paddles are exposed to the heating medium at the same time; when the material becomes too thick to stick to the surface, drum dryers are used. Since both types of dryers operate through conduction, their energy consumption is very low.