Xylitol is a five-carbon sugar alcohol with the appearance of white crystals or crystalline powder, odorless, with a cool sweet flavor. Its sweetness is comparable to sucrose, but the calories are lower than sucrose, about 40% of sucrose, which makes it a more ideal sweet substitute. As people's concept of healthy eating continues to grow, the demand for low-sugar, sugar-free, low-calorie foods and beverages continues to increase. Xylitol, as a natural, low-calorie sweetener, can meet the consumers' pursuit of healthy diet, and its application in sugar-free chewing gum, candies, chocolates, functional beverages, low-sugar beverages and other food products will be more widely used, thus driving the market demand to grow. The application fields of xylitol are expanding. In addition to the traditional food and pharmaceutical fields, its application in cosmetics, biomaterials, baked goods, meat products, ice cream and other fields is gradually increasing. For example, it is used as a moisturizing agent in cosmetics, and as a pharmaceutical excipient in the field of medicine, etc. The growing demand in new fields provides a broader space for the xylitol market.
Xylitol market competition is fierce, enterprises in order to stand out in the competition, will pay more attention to product quality, brand building and technological innovation. Jiangsu Jinwang keeps expanding the application of fluidized bed dryer in xylitol industry, and has developed a special fluidized bed drying and cooling integrated machine for xylitol, which can reduce the content of impurities in the product and improve the purity and stability of the product through the improvement of the production process, so as to meet the ever-increasing safety and quality standards of food additives. The new equipment realizes real-time monitoring and intelligent control of the production process with the help of advanced sensor technology, automation control technology and big data analysis. Through the analysis and optimization of production data, the production parameters can be finely adjusted to improve the stability of production and consistency of product quality, and to reduce manual operation errors and labor intensity.
Xylitol fluidized bed drying and cooling integrated machine process flow
(1) Preheating
Hot air supply: After air filtered by air filter, the air is sent into the heater by blower for heating, and the temperature of the heated hot air is generally within the appropriate range, and the specific temperature is determined according to the nature of xylitol and drying requirements.
Preheating process: the wet material entering the dryer is firstly contacted with the hot air of a certain temperature initially in the room temperature area or preheating area, the material is heated, the temperature gradually rises, and the moisture on the surface begins to be vaporized, which prepares for the subsequent drying process.
(2) Feed
Material preparation: usually from the crystallization process of xylitol wet crystals, its moisture content is high, need to be dried to meet the quality standards of the product.
Feeding method: the wet material is uniformly fed into the feeding port of the fluidized bed dryer through the feeding device, and the feeding speed can be adjusted according to the production capacity and drying requirements to ensure the uniform distribution of the material in the bed.
(3)Drying
Fluidized state formation: the preheated material enters into the drying area, in the drying area, the hot air passes through the bed at a certain speed from bottom to top, so that the material particles are in a fluidized state, i.e., the material particles are suspended by the hot air and flow and tumble in the bed like a liquid.
Heat and mass transfer: in the fluidized state, the material and the hot air are in full contact, the hot air will transfer the heat to the material, so that the moisture inside the material is constantly vaporized and diffused into the surrounding air, thus realizing the drying of the material. As the materials are constantly turning and mixing in the fluidized state, it makes the heat and mass transfer process more uniform and efficient, and improves the drying speed and product quality.
Drying parameter control: in the drying process, according to the nature of the material, the initial moisture content, product requirements of the zui final moisture content and other factors, strict control of the drying temperature, hot air speed, residence time and other parameters, in order to ensure that the drying effect and product quality stability.
(4) Cooling
Cold air supply: the dried material then enters the cooling area, which is fed with room temperature or low-temperature air to cool the material and reduce the temperature of the material to reach the temperature range suitable for subsequent packaging and storage.
Cooling process: cooling air and material heat exchange, take away the heat in the material, so that the temperature of the material is rapidly reduced to prevent the material from deterioration, caking and other problems due to high temperature in the packaging and storage process.
(5) Discharge
Discharging mode: After cooling, the dried xylitol material is discharged from the discharge port of the dryer, which is usually equipped with appropriate discharging devices, such as star unloader, etc., to control the discharging speed and prevent air leakage, and to ensure the stability of the pressure and airflow in the dryer.
Product collection: The discharged dried xylitol products are collected into storage containers or conveying equipment for subsequent packaging, inspection and other processes, zui finally become qualified xylitol products to the market.
(6) Exhaust gas treatment
Exhaust gas discharge: The exhaust gas containing water vapor and a small amount of dust generated during the drying process is discharged from the top of the dryer.
Dust removal treatment: the exhaust gas first passes through cyclone separator or cloth bag duster and other dust removal equipments to separate most of the dust particles entrained therein and recycle them, so as to minimize the loss of materials and prevent the dust emission from polluting the environment.
Tail gas emission: The exhaust gas after dust removal treatment still contains a certain amount of water vapor and a small amount of volatiles, and will be discharged into the atmosphere under the condition of meeting the environmental protection emission standards.
Xylitol fluidized bed drying and cooling integrated machine performance characteristics
(1)High drying efficiency
Strengthen heat and mass transfer: through the dual role of airflow rise and vibration motor, the material in the fluidized bed quickly reach a state similar to the fluid, which greatly promotes the rate of heat transfer and physical reaction to speed up the drying speed.
The material is heated evenly: fluidized bed can provide a larger contact area for the material and hot fluid medium, so that the material is evenly mixed and fully heat and mass transfer, avoiding the phenomenon of ditching and accumulating material, ensuring the dual enhancement of the fluidization quality and heat and mass transfer effect, thus improving the drying efficiency, which can make the drying process of xylitol faster and more uniform.
(2)Product quality guarantee
Prevent material contamination: the use of fully closed structure, effectively preventing cross-infection between the material and air, clean operating environment, to ensure the quality of xylitol, in line with the requirements of pharmaceutical production GMP and other high standards.
Reduce material damage: small damage to the surface of the material can avoid the destruction of the crystal structure of xylitol in the drying process, ensuring the quality and appearance integrity of the product.
(3)Good operation adjustability
Flexible parameter adjustment: the thickness of material layer, the moving speed of material in the machine and the change of full amplitude can be realized stepless adjustment, which can be precisely adjusted according to different drying requirements and material characteristics to achieve the best drying effect.
Diversified drying process: drying, cooling, sieving and other processes are integrated in a single device to achieve continuous processing of materials, reduce the footprint of the equipment, improve production efficiency, reduce equipment investment and operating costs, while also facilitating the automation of the production process control and management.
(4)Strong material adaptability
Applicable to a variety of forms of materials: applicable to powder and granular materials with a particle size greater than 50um, the drying effect is better for xylitol such as crystals, and it can also be used to deal with viscous, friable and other different characteristics of the material, and even in a certain range of particle size of the irregularly shaped materials can be applied.
Friendly to heat-sensitive materials: lower temperature can be used for drying, the particles will not be destroyed, can effectively guarantee the quality of the material, the melting point range of 92 ~ 96 ° ° C xylitol is particularly important.
(5) Significant energy-saving effect
Efficient heat utilization: high thermal efficiency, up to 60%~80%, compared with the general drying device can save energy 30%~60%, its energy saving advantage is obvious, and help to reduce the production and operation cost of enterprises.
Waste heat recovery and utilization: part of the dryer can also be equipped with waste heat recovery system to further improve the comprehensive utilization efficiency of energy.
(6) Stable operation of equipment
Reliable performance of vibration source: the vibration source is driven by vibration motor, which is stable in operation, convenient in maintenance, with low noise and long life, providing a guarantee for the long-term stable operation of the equipment.
Reasonable structural design: the upper and lower boxes of the equipment are connected by soft connection, which plays the effect of damping, reduces the vibration and noise during the operation of the equipment, and prolongs the service life of the equipment.
(7) Low maintenance cost
Simple structure: the structure of the equipment is relatively simple, no complex rotating parts, vibration parts, easy maintenance, reducing the difficulty and cost of maintenance of the equipment.
Durable materials and parts: the equipment is mostly made of high-quality stainless steel and other materials, with good corrosion resistance and wear resistance, long service life, reducing the frequency of equipment renewal and maintenance costs.
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