In the last issue, we introduced the drying characteristics of fluidized bed drying equipment . Today we will introduce the drying characteristics of the flow air drying equipment. These important foundations must be understood and learned by each user. Only the true understanding of each drying equipment is known. Features can be used better, improve the utilization rate and application ability of drying equipment, and reduce the wrong operation in use. The following is a detailed introduction to the drying characteristics of the air drying equipment.
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The airflow drying device is only applied to the powdery granular material, and the dried material is directly fed into the airflow drying device by the feeder, and the air is sent to the combustion furnace by the air blower, and after heating, enters the bottom of the airflow drying device. The high-speed hot gas stream accelerates and disperses the added granular wet material to be suspended in the gas stream, and completes the drying of the wet material during the acceleration and transportation of the gas stream. If a wet material disperser or a small material pulverizer is added to the air drying apparatus, the apparatus can also be used for drying the filter cake material and the bulk material.
The main feature of the airflow drying equipment in drying materials is that since the dried material is dispersed and suspended in the airflow, the entire geometric surface area of ​​the material participates in heat transfer and mass transfer, so effective heat transfer, mass transfer area, volumetric heat transfer The coefficient is high, generally 2326-6978W / (m?. °C). In the design of some airflow drying equipment, the volumetric heat transfer coefficient is 1163-3479W/(m?.°C) for materials containing non-bonded moisture, and the volumetric heat transfer coefficient is 582-1163W/(for porous materials containing combined moisture). m?.°C); For a dispersing machine with highly dispersed materials in the process, the volumetric heat transfer coefficient is 3479-11630W (m?.°C). After the air-dried material, the unbound water can be almost completely removed, such as residual moisture in the crystalline salt product is about 0.3%-0.5%, and for the highly adsorbable material, the residual moisture in the product is about 2%- 3%. The drying operation of the airflow drying equipment has a large airflow speed. Generally, for materials with good dispersibility, the operating gas velocity is 10-40 m/s, so the residence time of the materials in the drying equipment is short, generally about 0.5-2 s, and the longest can be Up to 7s. The temperature of the material outflow drying device is close to the wet bulb temperature of the air of about 60-70 ° C. Therefore, the air flow drying device is suitable for drying the heat sensitive material. The structure of the airflow drying device is simple, and the airflow drying device currently used has a drying pipe height of 6-20 m and a pipe diameter of 0.3-1.5 m. The air drying tube like dry 2.5*(10*10*10*10) Kg/h coal or 1.5*(10*10*10*10) Kg/h ammonium sulfate has a diameter of 0.7 m and a height of 15 m. Large production capacity. Like treatment of quartz sand 2.5** (10 * 10 * 10 * 10) Kg / h, urea 6.0** (10 * 10 * 10 * 10) Kg / h. The heat dissipation area of ​​the airflow drying device is small, and the heat loss can be controlled at about 5%. Therefore, the thermal efficiency is high, and the thermal efficiency can reach 60%-75% when the hot air temperature is above 400 °C and the exhaust gas discharge temperature is 60-100 °C. However, when the moisture is combined in the dry material, the thermal efficiency is about 20% due to the lower air temperature of the drying device. The airflow drying equipment has a small main equipment, low equipment investment cost, small floor space, continuous operation, and easy automatic control. However, the accessory equipment of the airflow drying equipment is large, the operating air velocity is high, the material under the action of the airflow, the impacting of the pipe wall, and the collision between the materials, the wear of the materials and the pipe is large, and the requirements for the granularity and the crystal form are very strict. The drying equipment should not be used for materials.
Secondly, airflow drying equipment is also not suitable for highly adherent materials. In addition, it is not suitable to use the drying equipment for drying materials which are easy to produce fine powder during the drying process and which are not suitable for separation, and materials which require a large amount of air.
At present, there are many small and medium-sized airflow drying equipments in China, and there are fewer large-scale airflow drying equipments; there are many processes using direct feeding, and there are fewer processes using other auxiliary devices. However, there have been many developments in the modification and strengthening of the drying tubes of airflow drying equipment, such as pulse type, cyclone type, push cone type airflow drying equipment.
Through this introduction, do you have a new understanding and understanding of airflow drying equipment, which can increase the unnecessary waste of resources and low product quality in the use of airflow drying equipment, and also solve the problem that airflow drying equipment can be applied to What material, and the problem of blind use. 
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Shenzhen Hongfa Automatic Door Co., Ltd. , https://www.hfhighspeeddoor.com