Graphite specific flash evaporation dryer

NegotiableUpdate on 05/19

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Nature of the Manufacturer: Producers

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Overview

At the bottom of the drying tower, there is a snail shell type air distributor and agitator, and the speed of the agitator is infinitely regulated by adjusting the speed of the external motor. The agitator has two functions: it can drive the hot air entering the drying chamber from the distribution chamber to generate a high-speed rotating airflow, thereby forming a stable fluidized bed layer and avoiding unstable fluidization such as jetting and surging caused by local blockage; Secondly, due to the high-speed rotation of multiple sets of blades on the mixer, large pieces of material are continuously crushed, causing the particles that are dry on the outside and wet on the inside to be constantly wrapped, peeled off, and crushed. The surface is constantly updated, increasing the heat exchange area and strengthening the mass and heat exchange, thus improving the drying rate. In addition, the gap between the blades on the mixer and the wall of the drying tower is extremely small, and the materials adhered to the wall should be cleaned up in a timely manner to prevent the materials from staying for a long time and deforming. To ensure the invariant decomposition of materials, a cooling jacket is installed inside the tower wall, which can guarantee the quality of thermosensitive materials. The volute shaped air distributor ensures that the tangential hot air uniformly passes through the bottom annular gap and rises in a spiral shape. The reasonable annular gap wind speed ensures good fluidization and drying of the material.

Product Details

summary:

Flake graphite: Natural crystalline graphite that resembles fish phosphorus and belongs to the hexagonal crystal system with a layered structure. It has good properties such as high temperature resistance, conductivity, thermal conductivity, lubrication, plasticity, and acid and alkali resistance. Flake graphite is a natural solid lubricant with a layered structure, which is abundant in resources and inexpensive. Flake graphite has complete crystal structure, thin flakes, good toughness, excellent physical and chemical properties, and good thermal conductivity, electrical conductivity, thermal shock resistance, corrosion resistance, etc. Varieties of flake graphite are classified according to their carbon content: for example, high-purity graphite is defined as C%>99.9%; 94% C%<99% is high carbon graphite; 80% C%<94% is medium carbon graphite; 50% C%<80% is low-carbon graphite. Flake graphite is widely used in refractory materials for metallurgical industry, pencil leads for light industry, electrodes for battery technology, lubricating and sealing materials for chemical industry, etc. As a functional filler in coatings, it is mainly used in anti-corrosion coatings, fireproof coatings, and conductive coatings.

flash dryerIt is a rapidly developing and widely used drying machine, also known as a cyclone dryer or rotary rapid dryer in China. The flash dryer organically combines fluidization, swirling, spraying, crushing, and grading technologies, and is an optimized combination of fluidization technology, swirling technology, spraying technology, and convective heat transfer technology. The equipment has high technical content and is suitable for drying paste like, granular, filter cake like, and slurry like materials. Flash drying machine has the advantages of high thermal efficiency, short drying time, and good energy-saving effect. The paste like materials can be directly dried to produce powdered dried products, saving the processes of pre-treatment before drying, crushing and screening after drying. Due to the fast drying speed and short heating time of the material, it is not easy to damage the components of the dried material, which is particularly beneficial for drying heat sensitive materials. The drying process is fully enclosed, with no impurities mixed in, resulting in high-quality finished products and a good operating environment. At present, various models of flash dryers have been designed according to different materials, and a series of products have been formed, which are increasingly widely used in industries such as chemical, pharmaceutical, light industry, food, and mining.

At present, rotary flash dryers produced by general drying equipment manufacturers generally have the following problems: large one-time investment, high energy consumption, relatively small output, and time-consuming and labor-intensive equipment debugging. Even if the drying system is currently in operation, it is unknown whether it is operating in the best condition, which results in poor economic efficiency and waste. In response to these factors, our Yanling drying technicians have long identified the following two main reasons: firstly, the reasonable configuration of the system, such as measuring the quality and heat of different materials and production requirements, determining heat, air volume, temperature, etc; Secondly, how to improve the construction of the host for different materials and system configurations. By solving these two issues, the output can be further increased, thereby improving efficiency and achieving the goal of energy conservation. At present, flash evaporation dryer and airflow dryer are our company's main characteristic products.

Principle:

The clean air heated by the heat exchanger is blown into the air inlet and spun into the annular gap at the bottom of the drying chamber at a suitable speed. It then enters the drying chamber in a tangential direction and rises in a spiral shape. At the same time, the material is quantitatively added to the tower by a continuously variable speed feeder. In the drying tower, the material undergoes sufficient and efficient mass heat conversion with hot air. The dried powdered material is transported to the separator along with the hot air, where the finished product is collected and packaged, while the exhaust gas is further processed by the dust removal device and discharged.
At the bottom of the drying tower, there is a snail shell type air distributor and agitator, and the speed of the agitator is infinitely regulated by adjusting the speed of the external motor. The agitator has two functions: it can drive the hot air entering the drying chamber from the distribution chamber to generate a high-speed rotating airflow, thereby forming a stable fluidized bed layer and avoiding unstable fluidization such as jetting and surging caused by local blockage; Secondly, due to the high-speed rotation of multiple sets of blades on the mixer, large pieces of material are continuously crushed, causing the particles that are dry on the outside and wet on the inside to be constantly wrapped, peeled off, and crushed. The surface is constantly updated, increasing the heat exchange area and strengthening the mass and heat exchange, thus improving the drying rate. In addition, the gap between the blades on the mixer and the wall of the drying tower is extremely small, and the materials adhered to the wall should be cleaned up in a timely manner to prevent the materials from staying for a long time and deforming. To ensure the invariant decomposition of materials, a cooling jacket is installed inside the tower wall, which can guarantee the quality of thermosensitive materials. The volute shaped air distributor ensures that the tangential hot air uniformly passes through the bottom annular gap and rises in a spiral shape. The reasonable annular gap wind speed ensures good fluidization and drying of the material.
In the middle of the drying tower, a continuously variable speed quantitative feeder continuously adds materials. At the same time, the material is crushed by the bottom mixer and then blown up by 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 materials and hot air, with most of the water evaporating during this process. Material particles with high moisture content and smaller surface area settle in the drying chamber due to their gravity being greater than buoyancy. During the sinking process, they continuously dry and move to the bottom, where they are further crushed and dried by the blades and the impact of high-speed airflow. At this point, their gravity is less than buoyancy, and the particles begin to rise.
At the upper part of the drying chamber, there is a circular baffle, also known as a classifier. The material is carried up by the rotating airflow. Due to centrifugal force, large blocks of material that do not meet the moisture requirements (i.e. have a higher specific gravity) are subjected to centrifugal force, and their rotation radius increases. When their rotation radius is greater than the radius of the classifier, they are blocked in the drying chamber for further drying and crushing until they meet the requirements before overflowing. The finer crushed material is dried in the middle of the drying chamber and then carried up by the airflow. Due to its small particle size and meeting the moisture requirements (i.e. low specific gravity), the centrifugal force is relatively small, and its rotation radius is smaller than the classifier radius. It is then discharged with the airflow and sent to the collection device.

characteristic:

(1) The air intake adopts a dual channel tangential air intake to ensure dynamic balance and avoid material accumulation. (2) Set up a water jacket to prevent coking and discoloration of heat sensitive materials.

(3) The main tower is equipped with swirl plates to effectively control the final moisture content and fineness of the finished product.

(4) The dry airflow enters the bottom of the drying chamber, generating a strong rotating airflow that has a strong flushing effect on the materials on the wall, eliminating wall sticking

Elephant.

(5) The discharge adopts a closed fan and soft connection vibration to prevent material accumulation in the collection system.

(6) This system operates under negative pressure to suppress running, emitting, dripping, and leaking.

(7) Set up sewage outlets for easy cleaning.

(8) The machine is equipped with a special feeder, which solves the bridging and blocking phenomenon of filter cake, enabling the material to be uniformly, quantitatively, continuously, and stably added to the dryer, solving the problem of difficult feeding of paste like materials.

(9) The key components of the dryer are easy to replace, and the key control parameters can be adjusted to adjust the material retention time and adapt to the drying needs of multiple types of materials.

Changzhou Yanling Drying Friendly Reminder -14 Points to Pay Attention to when Choosing a Fast Rotating Flash Drying Machine

1. Physical and chemical properties of materials that require drying
The form, moisture content, water properties, crystal water, particle size, bulk density, viscosity, thermal sensitivity, softening point, phase transition point, thixotropy, toxicity, corrosiveness, odor, flammability, explosiveness, electrostatics, breathability, agglomeration, and easy pulverization of crystals or particles of materials can all affect the drying effect

2. Drying characteristics of materials
The drying curve, critical moisture content, and equilibrium moisture content under the selected drying conditions.
3. Dry production requirements and long-term planning.
4. The impact of material commodity value and drying effect on it. The impact of factors such as product moisture, pollution, temperature, wear and tear, pulverization, pulverization, rehydration, etc. on the value of the product.
5. Requirements for material recovery rate.
6. The top-down process of material drying. (Related to the state method of feeding and discharging)
7. Drying methods for materials in the past or similar products.
8. Available heat sources (coal, fuel oil, electricity, coal gas, liquefied gas, natural gas)
9. Are there any special requirements for the size of the installation site for the rotary flash dryer.
10. Environmental requirements - restrictions on dust emissions, noise, vibration, odors, volatile substances, etc.
11. Possible amount of procurement funds, local labor, land, and energy prices.
12. The operator level and maintenance ability of the dryer user.
13. Local environmental temperature and humidity
This mainly refers to the impact of weather changes on drying, generally flash drying machinesAll of them use atmospheric heating as the drying medium. The higher the temperature of the atmosphere and the lower the humidity, the more favorable it is for drying. However, in the southern spring and summer, when the weather is humid and the air humidity is high, it is not conducive to the ability of the dryer and affects the yield.
Our country has a vast territory, and there is a significant difference in air humidity between the north and south. In some parts of the south, the humidity in winter is only 0.008kg water/kg dry air, while in spring and summer, the atmospheric humidity can reach as high as 0.025kg water/kg dry air, which is more than three times higher than the former. Therefore, hot air drying operated at lower exhaust temperatures (<90 ℃) will inevitably decrease its drying rate and increase the required time as the atmospheric humidity increases in spring and summer. Due to the increase in atmospheric humidity, the equilibrium water content of materials will inevitably increase, which will lead to a decrease in drying yield, and in some cases, the yield will decrease by more than 50%.
14. Impact on flash evaporation dryerFactors affecting production capacity
Due to the same drying method, the heat energy consumed for drying and dehydrating one kilogram is basically the same, and the capacity of the heat source (hot air stove, steam radiator, etc.) matched with the dryer is also certain. Therefore, the main technical indicator of the dryer - drying capacity - is often based on the amount of water removed per hour (or * * * large amount of water removed). This indicator is measured under certain conditions, such as the type of wet material, initial moisture content, final moisture content, hot air temperature, environmental temperature and humidity, etc. Any change in one of the conditions will have an impact on the production capacity of the dryer, sometimes even more significant. Below are separate explanations.
(1) Types of wet materials
The type of wet material refers to the combination of material and moisture. Wet materials can be divided into ① capillary porous materials, where water is mainly bound to the material by capillary force, such as sand, silica, activated carbon, plain fired ceramics, etc. The bonding strength between water and the material is relatively small, making it easier to dry; ② Colloidal materials are dominated by the permeation and binding of water and materials, such as glue, flour balls, etc. These materials generally exhibit high viscosity, strong binding strength between water and materials, and difficult drying; ③ Capillary porous colloidal materials have the properties of the two types of substances mentioned above, such as mud coal, clay, wood, fabric, grain, leather, etc. There are many types of these materials, but the form of water binding between them also varies. The difficulty of dehydration under the same conditions is determined by the Tongluo factory.
The form of materials also has a significant impact on drying, such as granular materials, where larger particles are more difficult to dry than smaller particles, while larger particles, with smaller thickness, are easier to dry than larger ones.
(2) Moisture content of wet materials
Moisture content refers to the percentage of moisture in the total weight of wet materials.
In the formula: W - moisture weight;
G - Weight of wet material;
G0- Absolute dry material weight.
The initial moisture content refers to the moisture content of the wet material before entering the dryer. Generally, as long as the wet material can work inside the dryer, the higher the initial moisture content, the more fully the dehydration capacity exhibited by the dryer. On the other hand, the higher the initial moisture content and the constant final moisture content, the greater the dehydration capacity of the dryer, but the amount of dry material discharged actually decreases.
(3) * * * Final moisture content
Generally, the drying stage is in the deceleration stage after drying, and the lower the final moisture content required, the greater the difficulty of drying, the longer the required drying time, and the lower the thermal efficiency, which also affects the yield.
(4) Hot air temperature
Hot air temperature, also known as drying medium temperature, is a sensitive top pipe condition during drying. The higher the temperature of the hot air, the more thermal energy it contains, and the lower the relative humidity of the hot air, the stronger its ability to absorb and carry moisture, which is very beneficial for drying, and the drying thermal efficiency is also high. In many drying equipment, when other conditions remain constant, the dehydration capacity of the dryer is basically proportional to the change in hot air temperature. When choosing a drying equipment, it is important to have sufficient data on the maximum temperature at which the material will be damaged. If the material allows, try to choose a high-temperature medium. It should be noted that many drying methods, especially rapid drying, result in material temperatures that are significantly lower than the temperature of the drying medium. For example, although the hot air temperature of an airflow dryer can reach over 250 ℃, the discharge temperature is generally below 60 ℃.