Flash dryer is a very popular drying equipment, because before the flash dryer, the drying problem of filter cake materials and paste materials could only be solved by spray dryer and fluidized bed dryer. However, this is not only very troublesome to operate, but also too costly and too consuming, and there are also problems such as uneven drying and easy deterioration. However, since the successful launch of the flash dryer, these problems have been perfectly and effectively solved, and the drying speed is faster and simpler than before. Therefore, the launch of this drying equipment is particularly popular with users. If you have any equipment needs, please feel free to contact Zhengzhou Dingli New Energy Equipment Co., Ltd.!
But there is nothing perfect in this world, because the flash dryer also has some shortcomings, such as the problem of system leakage during feeding, which is also a question many people are asking. Therefore, when faced with insufficient problems, we can only use the method to solve them. Usually it can be solved by transformation and design, and I will introduce it below.
The above figure is a schematic diagram of the spiral shaft end seal structure. The numbers are recognized in sequence, such as: 1-reducer, 2-bearing box, 3-spiral, 4-feed port, 5-rotary flash evaporator, 6-shaft end seal, 7-bearing seat.
When designing a flash dryer, we also need to pay attention to some issues to ensure its success.
1. Set the inlet and outlet air temperatures of the flash dryer according to the process conditions of the product, and calculate the material balance and heat balance, and calculate the consumption of hot air. When performing heat balance, local climate factors and geographical location factors need to be considered.
2. Calculate the length of the pre-drying section. The pre-drying section is a section starting from the feed port and focusing on the top of the disperser, and the value is generally 800mm.
3. Calculate the sedimentation velocity of the material to be dried through small batch experiments or the establishment of a mathematical model, so as to obtain the sedimentation velocity of the airflow in the flash evaporator. (The rising speed of the airflow is generally twice the settling speed of the particles, or 3m/s higher than the settling speed)
4. The distance of the drying section can be calculated by the rising speed of the airflow and the material drying cycle. (The distance of the drying section is calculated from the feed port)
5. Calculate the entire drying cycle by the heat transfer rate of the material and the heat transfer area of the particles.
6. The diameter of the flash dryer can be calculated by the air consumption and the rising speed of the airflow obtained by the above calculation.
7. Reasonable design of the disperser: mainly for the setting of the speed and height of the disperser. The disperser provides kinetic energy for the dispersion of lumpy materials, so the paddles of the disperser must be able to provide sufficient linear speed. The disperser also needs to ensure that the material collides with the paddles before it reaches the bottom of the disperser during free fall.
In addition, it is reminded that when designing and modifying the flash dryer, it must be strictly followed in accordance with the requirements, so as to ensure the success rate and later quality of the flash dryer modification.
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