Advantages and disadvantages of technical content of flash dryer

Advantages and disadvantages of technical content of flash dryer

Advantages and disadvantages of technical content of flash dryer

The flash dryer is a new type of continuous drying equipment that combines drying, pulverizing and sieving. It is very suitable for drying like some filter cake, paste and muddy materials. And it is mainly composed of a main machine and a screw feeder, specifically composed of a stirring and crushing system, a drying main pipe, a heater, a feeder, a cyclone separator, a classifier, a bag filter, and a fan, and they are all They are driven separately by an electric motor.

The flash drying system, in addition to the main engine, must have three parts: the heating part, the gas supply part and the finished product collection. Usually, the heating in these three parts is basically using coal, fuel or electricity; and the gas supply system is generally composed of a centrifugal fan and its piping and valves; The collection part is composed of a cyclone separator and a bag filter. These are the basic configuration of the flash dryer system, and some special materials should be adjusted systematically to adapt to the drying requirements of different materials.

1. Firstly, the inner circumferential air velocity of the drying chamber is high, and the material residence time is short, so that the material sticking wall and the heat sensitive material can be effectively prevented from being deteriorated, and the uniform powdery product can be dried at one time, in the process. This eliminates the need for smashing and sieving.

2. The special setting of the bottom of the dryer: the cooling device and the air pressure sealing device, so that the material can be prevented from changing in the high temperature region at the bottom.

3. The inner part of the drying chamber is equipped with a classification ring and a swirling piece, and its material fineness and final moisture can also be adjusted. Due to its special air distribution device, not only can the resistance of the equipment be reduced, but also the uniformity of drying of the material can be effectively improved.

4. The flash dryer can also effectively control the final moisture and fineness, and we can ensure the moisture content and fineness of the product are uniform by adjusting the feeding, hot air temperature and classifier.

After talking about the above advantages, we usually know that any equipment or machine and other things have advantages and they are also disadvantageous. Let's talk about the shortcomings of the flash dryer. Its disadvantages are as follows:

1, first of all according to the nature of its work, it is a type of airflow drying, so its energy consumption is very high;

2. Secondly, because the material is moving at high speed in the dryer, the wear of the equipment is very serious, which will also reduce the life of the equipment.

3. In the process of dust removal in the later stage, the equipment investment of the previous fan is also very large.

The drying intensity of the flash dryer is very high. The main reason is that the material science will be centrifuged, sheared, collided and rubbed to cause it to be micronized, and it will be in a highly dispersed state, so the relative speed between the gas and solid will be larger, thus strengthening the transmission. Quality and heat transfer.

Generally, the flash dryer has a cylinder diameter of 0.2 to 1.6 meters and evaporates 10 kilograms to 2000 kilograms per hour. With unique structure and advanced settings, it fully utilizes functions such as mixing, grading, crushing and drying to achieve high efficiency and speed. The equipment consists of a feeder, a stirrer, a blower, a steam heater, a dryer, a classifier and the like. The equipment has a variety of feeding devices to choose from, the feeding is continuous and stable, no bridging phenomenon occurs in the middle; special cooling device is arranged at the bottom of the dryer to avoid deterioration of materials in the high temperature zone at the bottom; special air pressure sealing device and bearing cooling The device reduces the resistance of the device and effectively provides the processing air volume of the dryer; the drying chamber is equipped with a grading ring and a swirling piece, which can adjust the fineness and final moisture of the material; the circumferential gas velocity in the drying chamber is high, and the material residence time is short, effective Prevent material from sticking to walls and heat sensitive materials from deteriorating. Compared with other equipment, this equipment can effectively increase the proportion of materials. The device is widely used for drying pastes of foods, filter cakes and heat sensitive materials.