Chinese drying network Boiling drying, also known as fluidized drying, is a new development of fluidization technology in drug drying. The so-called fluidized bed refers to that in an equipment, the granular materials are stacked on the distribution plate. When the airflow passes from the lower part of the equipment to the bed, the solid particles will be in the bed as the speed of the airflow increases to a certain extent. Boiling occurs and this bed is called a fluidized bed. Drying using this method is called fluidized bed drying. There is dust insecurity in boiling drying equipment. What should be done in daily work? 1 Factors of Dust Explosion in Boiling Drying Devices Discussion The definition of dust explosion is that dust particles suspended in the air are in full contact with oxygen in the air. Under certain conditions, the oxidation reaction is instantaneously completed, and a large amount of heat is released during the reaction, resulting in high temperature, High pressure phenomenon. In general, when combustible solids are burned in air, they release energy and generate a large amount of gas, and the rate of energy released is both related to the size of the combustion velocity in the solid (dust) exposed area in the air. Therefore, for the same kind of solid material powder, the smaller the particle size, the faster the combustion and diffusion. Any dust explosion must have three elements, namely: 1 ignition source; 2 combustible fine dust; 3 dust floating in the air, forming a dust cloud within the explosive concentration range. Among them, an explosion will only occur when three elements are present at the same time. Therefore, as long as one of them is eliminated, dust explosion can be effectively prevented. 2 Factors for the electrostatic generation in the boiling of powder boiling equipment During the boiling and drying process of the material in the boiling drying equipment, due to the violent friction between the drying gas and the surface of the material particles, severe collision and friction will also occur between the dry solid particles. Solid particles also have violent collisions and frictions with the wall of the cylinder, the trapping bag, and the wall of the pipeline, causing the surface of the solid particles to carry a large amount of static electricity; on the other hand, with the continuous refinement of the solid particles, a great deal of new life is generated. On the surface, the surface charge balance state of the primary particles is destroyed, causing a large amount of charges on the surfaces of the new particles. Due to the accumulation, adherence of the pipe wall, etc., once the grounding state of the complete machine is unfavorable, the accumulated electrostatic charge can be made to a relatively high voltage, and under certain conditions, it may result in an electric discharge generated by the electrostatic discharge. If the material being dried is flammable and explosive, the static spark can easily cause sudden burning or explosion of the dry material. 3 Discussion on unsafe factors of powder in boiling and drying equipment As the material is boiled in the boiling and drying equipment, no matter whether it is in boiling or trapping operation, a lot of dust can easily be generated. The dust boiling can easily cause the above-mentioned electrostatic spark, which may be Causes ignition source elements. Therefore, it is very likely that there are dust explosions for general materials. If the material contains combustible fine powder components, it means that there are three elements of a dust explosion. Dust explosion is extremely probable. If the explosion-proof motor is only provided in the boiling and drying equipment, it is only necessary to prevent the “ignition source†on the basis that it must be configured for such equipment. The above shows that electrostatic and dust explosions are the key to the explosion-proof safety of such equipment. They are often forgotten by people. The actual production of pharmaceuticals is to ensure that the production equipment is safe, reliable and in compliance with the corresponding process requirements. WEIHAI SUNSHINE YACHTS CO.,LTD , https://www.ssboats.cn