The Application of Boiling Dryer in Industry and the Characteristics of Its Equipment
Abstract: Based on the basic principle of boiling and drying, the difference between several boiling desiccators is analyzed, and the characteristics of boiling drying equipment are expounded.
Keywords: boiling dryer, industrial application, equipment characteristics
Boiling dryer, also known as fluidized bed, after 30 years of use, improvement, in the pharmaceutical, chemical, food, food and other aspects of its more important to reflect its important role, however, different types of boiling dryer performance And the application is also different. This paper begins with the basic concept of boiling dryers, analyzes the differences between several types of boiling and drying, and describes the characteristics of boiling drying equipment, so that people can better use such equipment, and make such equipment manufacturing and application More complete, more reliable, more secure, while making such equipment for our industry better service.
1. The basic idea of boiling and drying
1.1 Basic principles of boiling and drying
Boiling dry definition: boiling dry and commonly known as fluidization drying, refers to the drying medium to solid particles in the fluidized state of the process of drying.
Boiling dry principle: refers to the drying medium to solid particles in the fluidized state of drying, the material drying process is the basis of the powder boiling, at the same time, under the action of the exhaust, the container fine powder by the capture bag filter Back outdoors. Drying due to gas-solid two-phase counter-current contact, violent stirring. The solid particles are suspended in the drying medium and have a large contact surface area, both in terms of heat transfer, mass transfer, volumetric drying strength, thermal efficiency and so on.
Because of the good adaptability of boiling and drying to various materials, compared with other dryers, the area is small, the production capacity is large, the thermal efficiency is high, the operation is easy to control, the particles are broken, and the current is widely used, especially in the pharmaceutical industry in.
1.2 boiling dry characteristics
1.2.1 As the material and drying medium contact area, while the material in the bed constantly intense agitation, so the heat transfer effect is good, heat capacity coefficient;
1.2.2 Because the temperature distribution within the fluidized bed is uniform, thus avoiding any local overheating of the product, it is particularly suitable for some thermal materials to dry;
1.2.3 in the same equipment can be continuous operation, can also be intermittent operation;
1.2.4 material in the dryer within the residence time, can be adjusted as needed, so the product moisture content stability;
1.2.5 Drying device itself does not include mechanical moving parts, so the equipment investment cost is low, the maintenance workload is small.
1.3 Application of boiling drying in the pharmaceutical industry
Boiling and drying can be widely used in the production of bulk drugs, applicable varieties are: amoxicillin, ampicillin, acetaminine, dihydro streptomycin, kanamycin, ampicillin, penicillins, tetracycline, streptomycin , Chloramphenicol, sulfamethoxazole, vitamin A, vitamin E, vitamin B12, aluminum hydroxide, aluminum sulfate glycol, amylase, barium sulfate, calcium lactate, calcium pantothenate, hormones, l-lysine, nicotinic acid , Protease, rutin derivatives, liver and so on.
2. Boiling dry type difference and comparison with other equipment
2.1 boiling dry type difference
With the continuous development of application technology, the type and application of boiling dryer are more and more, and the classification method of equipment is different. According to the dry material can be divided into three categories: the first category is granular materials; the second category is paste material; the third category is suspended and liquid and other materials with mobility. According to operating conditions, basically can be divided into two categories: continuous and intermittent. According to the structure of the state to the general flow type, stirring fluidized, vibration.
Now on the step by step the company produced by the boiling drying equipment from the above three aspects for a brief introduction. From the operating conditions: GFG series of efficient boiling dryer, FG series of boiling dryer is intermittent, dry material particle size has certain requirements, the general requirements of not less than 30 microns, not less than 4mm for the appropriate. When several kinds of materials mixed together dry, the proportion of various materials should be close. The XF series of horizontal boiling dryer, GZQ series of vibrating fluidized bed dryer and NDF heating fluidized bed dryer is a continuous type, to meet the requirements of continuous production.
2.2 Comparison with other equipment
As the boiling dry on the adaptability of various materials is better, it is more than the hot air circulation oven, small footprint, large production capacity, high thermal efficiency, and dry moisture after the product evenly. Compared with the air flow, the product can reach the expected moisture content by adjusting the length of the material in the fluidized bed.
3. Brief introduction to the characteristics of several commonly used boiling drying equipment
Due to the different requirements of different materials and the requirements of the finished product, there have been different types of fluidization dryer, the following combination of one step of the company's several fluidized drying equipment in the pharmaceutical industry application characteristics, made a brief, Have a better understanding, but also make the company's products better application and service in the pharmaceutical industry.
3.1 GFG series of high efficiency boiling dryer
GFG series of high efficiency boiling dryer (Figure 1) for drying mechanism Screw extruded particles,
Rocking granules, wet high-speed mixed granulation granules; medicine, food, feed, chemical and other fields wet
Granules and powdery materials; large particles, small pieces, viscous granules; konjac, polypropylene
Enamides and other dry volume changes in the material.
Process flow (Figure 2), the air after purification by the fan from the lower part of the introduction, wear
The hopper of the hopper. In the studio, the role of mixing and negative pressure fluidization, water fast
After the rapid evaporation with the exhaust away, the material quickly dry.
GFG series of efficient boiling dryer Features:
① fluidized bed for the circular structure to avoid dead ends;
② Hopper set to stir, to avoid damp material reunion
And the formation of ditch when dry;
③ the use of dumping unloading particles, convenient quickly and thoroughly, also
Can be designed as required automatic access system;
④ sealed negative pressure operation, air flow through the filter;
⑤ easy to operate, easy to clean, is consistent
"GMP" requires the ideal equipment;
⑥ drying speed, temperature symmetry, each batch of dry
Time is generally 20-30 minutes.
GFG efficient boiling dryer has been in Shandong Xinhua Pharmaceutical Factory,
Guangdong Zhuhai biochemical pharmaceutical factory and New Zealand, Indonesia, the Philippines
And other enterprises and countries to use.
3.2 FG series vertical boiling dryer
FG vertical boiling dryer (Figure 3) is mainly used for pharmaceutical, food, chemical and other industries for powder or granular materials drying.
FG vertical boiling dryer features:
① fluidized drying, fast heat transfer;
② in the closed negative pressure operation, no dust flying;
③ the use of anti-static filter material, safe operation;
④ equipment without dead ends, cleaning thoroughly, no cross-contamination;
⑤ meet the GMP specification requirements.
3.3 XF series horizontal boiling dryer
XF Series Horizontal Boiling Dryer is made up of an air filter, a fluidized bed
Host cyclone separator, bag filter, high pressure centrifugal fan, console composition. As the nature of different dry materials, supporting dust removal equipment, can be carried out as needed, can also choose cyclone separator, cloth to be precipitator. You can also choose one of them. In general, the proportion of larger materials only need to choose cyclone separator. The proportion of lighter materials need to configure the bag filter, and spare pneumatic feeding device selection.
XF series of horizontal boiling dryer is mainly applied to (Figure 4) pharmaceuticals, chemical raw materials, food, food processing, feed drying operations. Such as: raw materials, tablets tablets, Chinese medicine granules, health food, beverage granules, corn germ, feed, plastic resin, citric acid and other powder granular material drying dehumidification. Applicable material particle size is generally 0.1-6mm, particle size 0.5-3mm.
XF series of horizontal boiling dryer works:
The clean hot air is distributed into the bed through the valve plate, and the wet material from the feeder enters the boiling state by the hot air. Due to extensive contact with hot air and materials, increased heat and mass transfer process, so in a short period of time can be dry. From the bed of a head into, after tens of seconds to a few minutes boiling dry, automatically from the other end of the bed out. The device is normally operated in negative pressure. XF series horizontal boiling dryer features: can be automated production, continuous drying equipment. Drying speed, low temperature, to ensure product quality, in line with the requirements of pharmaceutical production GMP. Steam, electricity, hot stove can be equipped with.
3.4 GZQ series vibrating fluidized bed dryer
Particulate material in the ordinary fluidized bed dryer for drying, the material stars
The particles should be uniform and have a certain size, or will form a groove flow and the stagnation area, the particle size distribution is wide, the entrainment is serious, the humidity is easy to agglomerate, and because the particles back to mix, the particle retention time distribution range, Uneven moisture content, thus limiting the use of ordinary fluidized bed dryer. In order to overcome its shortcomings, abroad to improve the performance of fluidized bed dryer has done a lot of research. Especially in the energy shortage today to strengthen the mass transfer process, saving energy, improve quality, so that fluidized bed dryer with a wide range of adaptability and economic rationality, vibration fluidized bed dryer is of great significance. The vibrating fluidized bed dryer has the advantages of advanced design, reliable quality, wide application range and significant energy saving and drying materials which are difficult to dry on other dryers. Therefore, vibrating fluidized bed dryer is widely welcomed by various industries.
3.4.1 GZQ series vibration fluidized bed works:
Vibrating fluidized bed dryer (see right) is generated by the vibrating motor excitation force to make the machine vibrate, the material in this given direction under the action of the exciting force jump forward, while vibrating fluidized bed drying machine bed input hot air So that the material in the fluidized state, the material particles and hot air full contact, so as to achieve the desired drying effect. Material from the vibrating fluidized bed dryer into the mouth of the vibrating fluidized bed dryer trench on the material and the lower part of the groove into the hot air cross-contact heat transfer, wet air from the wind lead, dry material from the discharge port discharge.
3.4.2 Scope of application:
GZQ series vibratory fluidized bed dryer is suitable for drying materials that are not easy to flow (such as too coarse or too thin, easy to stick or agglomerate, etc.) and special requirements of the material (such as the need to maintain the crystal integrity, crystal flash good, etc.) The At present, the company has successfully used this equipment for the drying of citric acid, monosodium glutamate, borax, ammonium sulfate, compound fertilizer, radish, soybean meal, lees, seeds, slag, sugar and other materials.
3.4.3 Features:
3.4.3.1 vibrating fluidized bed dryer using vibration motor drive, smooth operation, low noise, long life, easy maintenance.
3.4.3.2 vibration fluidized bed dryer vibration material to reach the fluidized state, increasing the effective heat transfer coefficient, so the thermal efficiency. Bed temperature distribution uniform, no local overheating phenomenon. Fluidized uniform, no dead angle and blowing phenomenon. Vibration from the role of transport, but also conducive to saving energy. Than the average drying device can save 30-60%.
3.4.3.3 The thickness of the material and the speed and amplitude of the machine can be adjusted steplessly.
3.4.3.4 material surface damage is small, can be used for fragile material drying, irregular particles can also be used when the material does not affect the effect. 3.4.3.5 vibrating fluidized bed dryer with a fully enclosed structure, effectively preventing the material and the outside of the cross-contamination, clean environment, improve the working conditions.
3.4.3.6 vibration to promote fluidization, so that the amount of air required to reduce the particle entrainment rate decreased;
3.4.3.7 by adjusting the frequency and amplitude of vibration, easy to control the residence time of powder particles to achieve continuous operation;
3.5 NDF series of heated fluidized bed dryer
    The internal heating fluidized bed dryer (Figure 6) is designed on the basis of a fluidized bed, mainly by setting the heater in the fluidized section of the fluidized bed, which can provide a large portion of the heat required for the material to dry Can reduce the temperature and speed of the flow through the fluidized bed, which is essential for the processing of heat-resistant products, and for the crystal water, difficult to dry materials with this device is more ideal, with the ordinary fluidized bed Compared with a small size, high thermal efficiency, air flow through the small and other significant advantages. Has been accepted by the domestic market. The current use of lysine hydrochloride drying equipment.
4. Summary
This article from the basic idea of boiling dry start, so that people of different types of boiling and drying have a better understanding. At the same time, one step in the company in recent years developed the characteristics of boiling drying equipment made a comprehensive brief. The boiling and drying of this technology has its particularity, different products with different drying process and powder rules, not applicable to a variety of different requirements of a single spray drying models. Boiling and drying is still regarded as a skill, the experiment is the basis of the correct shape. One step of the company has experimental equipment designed for users of the material of the process test, but also to complete such equipment turnkey projects. The purpose of this article is to spray the drying series of equipment for our industry better service, but also look forward to peer updates, better boiling drying equipment come out.