Fluid bed dryer, the country commonly known as the step the pellet mill, in the 1980s, the introduction of foreign countries on the basis of the same type of products, the digestion and absorption, improved design made. Since the device is easy to operate, superior performance, sophisticated manufacturing, in particular, is able to meet the pharmaceutical, food industry, GMP requirements, much pharmaceutical, food sector users welcome. The device is especially suitable for Chinese and Western medicines and food drying and granulating, particles of disintegration, good mobility, good instant, can be directly used for tabletting, filling capsules, granules and solid drink.
Dryer feeder into the dryer, the role of wind pressure, the material in the boiling state within the dryer, and extensive contact with the hot air drying materials in a relatively short time. Powder granulation, improve liquidity, reduce dust emissions; to improve its dissolution performance of powder Granulating; mixing, granulating, drying in one machine to complete the one-step granulation; anti-static cloth, equipment operation safety; set pressure relief hole in the event of an explosion, equipment, personnel from harm; equipment has no dead ends, lighter, faster loading and unloading, rinse, to meet the GMP standard.
In the production process of solid dosage forms, fluid bed dryer is often optional equipment. Boiling dry with effects of heat transfer and large capacity, temperature distribution, various forms of operation, material residence time adjustable, low investment costs and maintenance workload of small advantages. Boiling dry, also known as fluidized bed drying, which uses hot air flow so that the wet particles suspended fluidized boiling material for heat exchange, evaporation of water or organic solvents away by hot air, the hot air flow of materials gas - solid suspension quality of contact heat transfer way, to achieve the purpose of drying of wet granules.
The fluid bed dryer is an air convection drying equipment from the formal and conduction drying equipment, energy consumption is indeed larger, but if you take some measures you can achieve a good energy saving effect. (1) to enhance the sealing effect of the device. Most of the fluid bed dryer hopper with the device body with a flange connection, poor sealing effect when the proposed design switch to the convex surface of flange connection; (2) dryers are used in the steel wound finned heat exchanger, pipe Although the material cost savings, but the effect of heat transfer is not good, it is recommended to switch to brass; (3) to increase the insulation measures. The heat exchanger shell to add insulation layer to minimize heat loss.
Plates of airflow distribution in the fluid bed dryer has two roles, first, the supporting material layer, the gas evenly distributed. Distribution plate hole size, shape, distribution situation, the opening rate and so the fluid distribution plays a crucial impact. Gas distribution is uneven, make the bed "circulation" in its extremes easy to make the bed in some parts of "channeling", while the remaining parts of the death-bed, when most of the gas along the bed some channel in the form of short-circuit "channeling" through the bed to leave, so that the gas-solid contact with a significant deterioration, which should make efforts to avoid.
Drying process and equipment design is unreasonable, will lead to energy loss. To solve these problems, the drying characteristics of the product of systematic study to determine the optimal drying process parameters, such as to be dry nature of the materials. The nature of the material itself is the most important factors affect the drying, the shape of the material, size, combination of accumulation of thickness, water, and chemical properties will affect the drying rate.
Boiling the safe operation of the dryer
Boiling drying equipment, the basic principle of the fluidized bed work based on its material basis of the drying process is boiling powders.
In the exhaust under the fine powder within the container trap bag filter back row to the outside, the trapping process there are a large number of ultra-fine powder to produce, whether it is boiling in the flow or trap run the whole process of boiling dry with ultra-fine powder movement.
However, the process of powder movement is often accompanied by two problems with static electricity and dust explosion under the guidance of some of the factors to cause an explosion phenomenon.
Improvements is recommended on the fluid bed dryer
Long-term use and development of the fluid bed dryer in the structure, performance has significantly improved, the quality is improving, but there are still some problems, the following production practice recommendations for improvement:
Inadequate recommendations for improvement on the heat
The fluid bed dryer is an air convection drying equipment from the formal and conduction drying equipment, energy consumption is indeed larger, but if you take some measures you can achieve a good energy saving effect. Suggestions: (1) to strengthen the sealing effect of the equipment. Most of the fluid bed dryer hopper with the device body with a flange connection, poor sealing effect, the proposed design the switch to the convex surface of flange connections; imported pump Custer red wine (2) dryers are used in the steel winding wings piece heat exchanger steel pipe can save material costs, but the effect of heat transfer is not good, it is recommended to switch to the brass; (3) to increase the insulation measures. The heat exchanger shell to add insulation layer to minimize heat loss.
Boiling drying process repeatability and traceability
In actual production, the operator device on each production process parameters should be re-set and modified, can not guarantee the same product using the same equipment, process parameters for production, there are no retrospective. According to the GMP, the devices can store a certain amount of production process parameters, to ensure production repeatability and traceability to individual users to set the number of varieties. Boiling drying equipment generally requires the ability to store up to 50 kinds of production processes, while most of the domestic equipment can not do this. The proposed improvement and expansion of the PLC control systems, mechanical implementation of institutions better. Have enough memory, can store a variety of production processes, and provide on-site printing parameters, data preservation, data and data PC connectivity. |
How to solve the problem caused by an irrational fluid bed dryer, the drying process and equipment d