Drying process of tube bundle dryer

Process Flow Details

The shell and transmission mode of the tube bundle dryer are very similar to those of the rotary drum dryer, but 1~5 layers of tube bundles are arranged concentrically inside. The tube bundles run through the entire length of the dryer, with steam or other heat media passing through them, using both conduction and convection heat transfer. High thermal efficiency, the total heat transfer efficiency can reach 80%~90%, especially suitable for drying materials below 150℃. It is mainly used for drying slag and minerals, and the drying strength is 25%-30% higher than that of ordinary tube bundle dryers. It has been applied in many enterprises in starch, winemaking, chemical industry, food, medicine and other industries. The core component of the equipment, the tube bundle, is made of high-quality boiler steel pipe (GB3087). The advanced expansion joint process greatly absorbs and eliminates the alternating stress generated by the tube bundle during the rotation process, and completely solves the problem of the traditional welding process. The defect of fracture occurs; the overall turning of the half shafts at both ends of the tube bundle can accurately ensure the coaxiality of both ends, which greatly improves the service life of the main bearing of the tube bundle and the running stability of the tube bundle; according to the drying characteristics of the material and the drying curve The specially designed tube bundle turning shovel, pushing shovel and unloading shovel can make different materials achieve the best drying effect.

The tube bundle dryer uses the principles of heat conduction and heat radiation. The steam flows in the tube bundle in a countercurrent or cocurrent manner with the material. The material is stirred and pushed by the shovel plate on the tube bundle in the negative pressure closed cavity, and moves from the feed end to the discharge end. Part of the finished material passes through the discharge chute to the discharge screw, and is discharged by the discharge fan. The other part of the finished product is turned off the fan through the return material to the mixing screw, and is fully stirred and mixed with the wet material by the conveying mixer to reduce the moisture content of the original wet material and achieve the ideal working conditions of the dryer. The drying of the material can be co-current or counter-current. When the tube bundle dryer is working, the material is fed into the machine by the feeding auger and passes through the copying plate on the outer edge of the tube core. The material is continuously and uniformly pushed from one end of the dryer to the other end, and discharged from the discharge device. At the same time, the steam enters the steam distribution chamber from one end of the tube core through the rotary joint and the hollow shaft, and evenly enters the tube bundle heat exchanger. The heat energy is transferred to the material chamber through the tube wall to heat and dry the material. The condensed water formed by the cooling of the steam is discharged from the other end of the tube core through the condensed water discharge system, and the waste gas after drying of the material is drawn out by the fan.

Advantages of tube bundle dryer

1. Low power consumption and high thermal efficiency

The steam consumption has reached the advanced level of similar products, and it takes 1.2-1.4 kg of steam to evaporate 1 kg of water; the inner core components of the dryer are made of high-quality boiler steel pipes (GB3087); the advanced expansion technology is used, which greatly absorbs and absorbs heat. It eliminates the alternating stress generated by the tube bundle during the rotation process, and completely solves the defect that the traditional welding process is prone to breakage at the weld. It can be dried in both downstream and reverse flow drying. Therefore, it can be used for drying of certain heat-sensitive materials;

2. Large drying elasticity

The drying time can be adjusted according to different material properties and moisture requirements. It can dry high-moisture materials, with a high degree of automation and continuous production. For special production processes, it can also be intermittently produced.

3. High precision and high drying elasticity

The overall turning of the half shafts at both ends of the tube bundle can accurately ensure the coaxiality of both ends

It greatly improves the service life of the main bearing of the tube bundle and the running stability of the tube bundle. The tube bundle in this machine is installed on a fixed bearing and is equipped with an independent basic frame, which is convenient for the transportation and installation of the whole machine;

According to the drying characteristics and drying curve of the material, the specially designed tube bundle turning shovel, pushing shovel and unloading shovel can make different materials achieve the best drying effect; The amount of material in the machine and the drying time can dry high-moisture materials, and the drying elasticity is large;

4. High degree of automation

It can be continuously produced, and can also be produced intermittently for special production processes. The operating environment is clean, pollution-free, and low in noise. It has a wide range of applications and can be used for granular, fibrous, and powdery loose materials with different specific gravity, particle size, and moisture content. Get good drying results. The machine has few additional supporting equipment, less floor space, compact process, few wear parts, and easy installation.

5. Flexible drying methods

Both co-current drying and reverse-current drying are possible. Therefore, it can be applied to the drying of certain heat-sensitive materials; the drying flexibility is large, the degree of automation is high, continuous production, and intermittent production can also be used for special production processes; the drying time can be adjusted according to different material properties and moisture requirements, and the drying time can be high. moisture material;

6. It is more convenient to transport and install

The tube bundles in the machine are installed on fixed bearings and equipped with an independent basic frame, which is convenient for the transportation and installation of the whole machine;

7. The tube bundle dryer is suitable for a wide range of applications

Good drying effect can be obtained for granular, fibrous and powdery loose materials with different specific gravity, particle size and moisture content;

8. Small footprint and compact process

The machine has few additional supporting equipment, less floor space, compact process, few wear parts, and easy installation.