XZG series rotary flash dryer
1、 OverviewRotary flash dryer (Spin Flash Dryer) is a new product developed by our factory on the basis of digestion and absorption of APV APV ANHYDRO A / S technology, extracted from the essence of similar driers in China, and developed according to its practical experience for many years. The product has been developed, designed, demonstrated and improved for many times. Its advanced technology, precise structure, beautiful appearance and excellent performance have reached the domestic standard. Based on its excellent performance, the machine has been widely used in pesticide, pigment, dye, medicine, feed, food, coating, fertilizer and fine chemical industry and other industries. It has achieved the purpose of high efficiency, fast, energy saving, small equipment production and operation.
With the advanced management system, strong technical force, rich practical experience and perfect after-sales service, our factory can design the best scheme for you efficiently, quickly and efficiently according to the material performance, process conditions and plant layout of the responsible unit.
2、 How it works
The clean air heated by the heat exchanger is blown into the air inlet and rotated into the annular space at the bottom of the drying chamber at a suitable speed. Then it enters the drying chamber in the tangential direction and rises in a spiral shape. At the same time, the material is quantitatively added into the tower by the feeder with stepless speed regulation. In the drying tower, the material and hot air are fully and efficiently transformed by mass and heat. The dried powder materials are transported to the separator together with the hot air. The finished products are collected and packaged, and the tail gas is further discharged after being treated by the dust removal device.
A volute type air distributor and an agitator are installed at the bottom of the drying tower. The speed of the agitator can be adjusted steplessly by adjusting the speed of the external motor. The agitator has two functions: it can drive the hot air from the distribution chamber into the drying chamber to produce high-speed rotating air flow, and then form a stable fluidized bed layer, thus avoiding the unstable fluidization such as spouting and surging due to local blockage; Secondly, due to the high-speed rotation of several groups of blades on the agitator, the large pieces of materials are continuously crushed, so that the dry particles outside and the wet particles inside are constantly wrapped, peeled and rubbed, and the surface is constantly renewed, which increases the heat exchange area, thus strengthening the mass and heat exchange and improving the drying rate. In addition, the gap between the blade on the agitator and the wall of the drying tower is very small, so the materials adhered to the wall should be cleaned in time to prevent the material from denaturation due to long-term retention. In order to ensure the invariable decomposition of materials, cooling jacket is set in the tower wall, which can guarantee the quality of heat sensitive materials. The spiral case air distributor makes the tangential hot air flow uniformly through the bottom annular space and rises in a spiral shape. The reasonable annular air velocity ensures the good fluidization and drying of materials
In the middle of the drying tower, the constant quantity feeder with stepless speed regulation continuously adds materials. At the same time, the material is crushed by the agitator at the bottom and blown up by the high-speed rotating hot air, forming a relatively stable fluidized layer in the drying chamber. There is a rapid and sufficient exchange of heat and moisture between the material and the hot air, and most of the water evaporation is completed in this process. The material particles with high moisture content and small specific surface area settle in the drying chamber due to its gravity greater than buoyancy, and they are continuously dried in the process of sinking. When they move to the bottom, they are further crushed and dried through the crushing of blade and the impact of high-speed air flow. At this time, the gravity is less than the buoyancy, and the particles begin to rise.
The upper part of the drying chamber is provided with a ring baffle, that is, a classifier. The material rises with the entrainment of the rotating air flow. Due to the centrifugal force, the rotation radius of the large block of materials, which do not meet the moisture requirements (i.e. the specific gravity is large), is increased by centrifugal force. When the rotation radius is greater than the radius of the classifier, it is blocked in the drying chamber for further drying and crushing until it meets the requirements. After drying in the middle of the drying chamber, the finer grinding body rises with the air entrainment. Due to its small particle size and meeting the moisture requirement (i.e. small specific gravity), the centrifugal force is relatively small, and its rotation radius is smaller than that of the classifier, and then it is discharged with the air flow and sent to the collection device.
2、 Features:
1. The inner cone structure is set at the bottom of the drying chamber, so that the cross-sectional area of the gas flow of the dryer is continuously increased from bottom to top, and the gas velocity at the bottom is relatively large, and the gas in the upper part is relatively large
The velocity is relatively small, which ensures that the large particles in the lower part are in the fluidization state, while the small particles in the upper part are also in the fluidization state. The inner cone structure also shortens the length of the cantilever part of the mixing shaft, thus increasing the reliability of the operation. In addition, this structure can effectively prevent the bearing from working in the high temperature area, thus prolonging the service life of the bearing.
2. A scraper is arranged on the mixing teeth. When the material is rotated and crushed by the stirring teeth, it is thrown to the wall and adhered to the wall. If it is not timely, the material will be stuck to the wall
If the material on the wall is scraped off, serious "scab" phenomenon will appear, resulting in abnormal operation. The scraper installed on the mixing teeth can ensure that the material will be peeled off before the material is firmly bonded with the wall.
3. A grading ring is arranged on the top of the drying chamber. Its main function is to separate and block the materials with large particles and not yet dried, so as to continue drying
Ensure to meet the requirements of narrow particle size distribution and uniform moisture content.
4. A cooling jacket is arranged at the hot air inlet of the cone bottom. The temperature of hot air contact with material is very high, which is close to the temperature of hot air, far higher than that of hot air
Due to the temperature in the bed, it is inevitable that a small part of the material will stick around the annular gap during operation, and the residence time will be too long, which will lead to material deterioration and even melting. In order to avoid this phenomenon, adding a local jacket can reduce the temperature of the vessel wall and make the operation go smoothly.
Due to the above structural features, the flash dryer has the following advantages over other dryers
1. High drying strength. Due to centrifugation, shear, collision, friction and so on, the particles are highly dispersed, and the relative velocity between gas and solid phases
The mass transfer and heat transfer are strengthened.
2. Suitable for heat sensitive materials. The high-temperature area at the bottom of the dryer has high gas velocity, which makes it difficult for the materials to directly contact with the hot surface; in addition, cooling jacket and stirring are attached
All these solve the problem of material sticking to the wall and coking.
3. The process is simplified. Compared with other types of dryers, flash dryer can dry paste, mud, filter cake and other materials at one time
Drying into a uniform powder products, without crushing, screening and other processes.
4. Effective control of final moisture and fineness. The final moisture and particle size of finished product can be fully controlled by adjusting the temperature of feed and hot air and coordinating the classifier
So as to ensure the uniformity of moisture content and fineness of the product.
3、 Technical parameters model main engine inner diameter (mm) air volume (m3 / h) water evaporation capacity (kg / h) actual power (kw) ^ large height (m) floor area (M2)
XZG-2 200 350-500 12-17 10 4.0 15
XZG-4 400 1150-2000 40-70 18 4.2 20
XZG-6 600 2800-4700 90-150 25 5.2 28
XZG-8 800 4500-7500 150-250 32 5.6 35
XZG-10 1000 7000-12000 250-400 47 6.2 40
XZG-12 1200 11000-18000 350-600 56 7.0 52
XZG-14 1400 14000-23000 550-800 65 7.6 70
XZG-16 1600 18000-30000 750-1100 75 8.0 80
4、 Treatable materials and application examples
rotary flash dryer is suitable for the following materials:
1. Materials dehydrated by plate and frame filter or centrifuge;
2. Non pumpable paste materials;
3. Heat sensitive materials;
4. Viscous materials. Category material name initial moisture% final moisture%
nothing
machine
Things are hard
Salt barium stearate 400.5
Zinc stearate 400.5
Aluminum stearate 452.0
Calcium stearate 402.0
Magnesium stearate 405.0
carbon
acid
Salt manganese carbonate 20 1.0
Magnesium carbonate 82 3
Basic zinc carbonate 720.5
Superfine activated calcium carbonate 20 0.4
oxygen
turn
Zirconia 800.5
Iron oxide red 600.2
Antimony trioxide 60 1.0
Aluminum hydroxide 55 1.0
chlorine
Salt cuprous chloride 45 1.0
Sodium dichloroisocyanurate 25 1.0
sulfur
acid
Salt calcium sulfate 35 3.0
Magnesium sulfate 20 0.2
his
It's silica 855.0
Disproportionation catalyst 50 1.0
4A molecular sieve 402.0
Sodium citrate 70 1.0
Tribasic sodium sulfate 250.5
Organic
chemical industry
Raw material pyromellitic acid 251.5
Melamine formate resin 45 5
Acetanilide 150.2
Organic calcium 401.0
Chlorinated rubber 700.5
Diosgenin 705.0
agriculture
drug
Badan
20 1.0
Insecticidal list 20 1.0
Avermectin 80 15
5 0.5
Paclobutrazol 26 1.0
Methomyl 15 2.0
Quizaloform 58 1.0
Mancozeb 30 1.0
Tricyclazole 28 1.0
Atrazine 40 1.0
Dye and pigment phthalocyanine blue 350.5
Sulfurized red brown 60 3.0
Basic tender yellow 400.3
Oil soluble black 45 1.0
Sulfurized blue 60 3.0
Lead chrome yellow 400.1
BVG red 75 4.0
Guanosine acid 40 8
Vitamin B 29 1.0
Treating agent mud treating agent 754.0
Accelerator ZDC 800.5
RH glue 14 1.0
Additive TMTD 25 0.3
Beer yeast paste 856.0
Calcium hydrogen phosphate 854.0