The flash dryer is widely used in the dispersion and drying of granular, powdery, paste-like, and filter cake-like false agglomerates in the chemical, pharmaceutical, building materials, food, feed, and other industries. The flash dryer has the advantages of the small occupied area, low energy consumption, high thermal efficiency, and continuous mass production. What are the stages of material drying in flash dryers?
1. The speed-up drying stage of the material in the flash dryer. In the heat transfer medium, the particles are at a higher temperature and the relative humidity is less than 100%. The surface is heated to the wet bulb temperature of the drying medium in a short time, and the water evaporation rate increases rapidly. After a certain period of time, the heat absorbed by the particles is equal to the heat consumed by the evaporated water, reaching a balance. This stage is very short, the amount of water discharged is not large, and then enters the constant velocity stage.
2. The material in the flash dryer is at the same speed drying stage. At some stage, the water evaporated from the surface of the particles is constantly replenished from the inside to the surface of the particles, and the surface is always in a wet state. At this time, the drying rate remains unchanged and the particle surface temperature remains unchanged. The evaporation rate is related to the difference in water vapor concentration and temperature on the surface of the particles and the surrounding medium. The greater the difference, the faster the drying speed. In addition, the drying speed is also related to the air speed on the surface of the particles. There is always a layer of air film on the surface of the particles that is not easy to flow. The reduction of the air film is beneficial to the evaporation of moisture and heat exchange. Therefore, increasing the velocity of the airflow on the surface of the particles and thinning the air film can increase the drying rate. Drying lasts for a certain period of time, and the diffusion rate of water inside the particles starts to be lower than the surface evaporation rate. The moisture in the particles cannot completely wet the surface to keep the surface from evaporating, and then the next drying stage begins.
3. The material in the flash dryer is cooled and dried. When the amount of evaporation reaches a certain level, the moisture inside the particles is not enough to completely wet the surface, the wet surface gradually decreases, and the drying rate gradually decreases. At this stage, the evaporation and heat consumption decrease significantly, and the surface temperature of the particles is higher than the humidity of the medium. The ball temperature gradually rises, and the temperature difference with the carrier gradually decreases until it is close to or the same.
4. Material balance stage in flash dryer. At this time, the moisture absorption and evaporation on the particle surface reach equilibrium, and the drying rate is zero. The moisture in the particles is the final moisture in the dry, usually not lower than the equilibrium moisture during storage. The material particles are small after the rotary flash dryer is dried, and the residence time in the dryer is extremely short, usually 1-3s. Therefore, the surface temperature of the granules is the wet bulb temperature of the drying medium during the constant-speed drying stage. Using a rotary flash dryer, the particle size of the material is uniform, which is beneficial to ensure product quality.
Zhengzhou Dingli is a professional manufacturer of Flash Dryers, if you want to know more information, please feel free to contact us.
If you are looking for related products or have any other questions
Please Contact Us.png)
Good morning i'I am from Tunisia please can you send me the technical information and price of the sand dryer capacity 20 T/h diesel
Hi, we are looking for coal dryer with 850 tons per day input. Please send me the cost of complete installation in Rajasthan India.
Silica sand dryer 20-30t/h production best price quotation manual oprater
Dryer and granulation - We want to produce organic fertilizer using chicken waste and cow manure as well as lime kindly avail your best price of 10 / 30 tone capacity per hour
Please me your quotation for a 2 tons/hr, and 4 tph capacitiy Rotary Drum Dryers for Wood Chips from medium-hard wood, with about 60% moisture content.
Hi I am a moroccan olive oil producer and I would need a quote for an olive pomace dryer with a capacity of 500T per day thank you i n advance for your help
We require a price quote for a rotary dryer with a capacity of 250 tons per day. The input material is a copper concentrate with 16% humidity; we need the output humidity to be 10%.
Could I please have a quote on a drying system - we have a wood shaver and would like to purchase a dryer that can do 3tonne per hour.
Will your equipment be able to dry out granite with 8% moisture content. Production Rate 20 tons an hour. What medium would you use for heat source?
l need a Sludge Dryer for stp that can process about 200 tons per day. Please share all details with price.
I'm from Thailand. Please let me know if your dryer system will work for drying pineapple skins or mango pulp waste?
I'm interested in getting some information about a rotary dryer, specifically regarding its pricing. Raw material we'll be working with is sugarcane bagasse. Our daily capacity stands at 35 tons
I would like to ask for a price quotetion for sand dryer, how much is the one which makes 30 tones per hour after reaching my country
I want to know the price for the muncipal waste dryer and if you have a whole asssembly line to make Charcoal Briquette on a large scale
Pellet plant. 2.5 to 3 ton per hour, I want to setup our own biocoal and pellet plant In morena mp so I want to know about a price of machineries.
I Required baggase dryer for 8 ton per hours with 55% moisture.Please kindly send your best quotation and product specifications.Regards
I am interested in this plant equipment mainly to dry coffee grounds. Send me Coffee grounds drying machine video demonstration of DLGT2218 and DLGT 2523.
0.2 x 5 cap 15t/h, What will it cost me to have this size of Sand dryer? Please your quote is most needed
Informations about and how much is the coast to dry raw coal 1000 to 2000 tons per day
Please send cost of wood chips dryier and full information use in pakistan. Capacity 5-8 tons per hr.
Do you have 5-10 ton/h capacity available and what is the price for the whole wood sawdust drying biochar plant including moulding machines and packaging
Need coal upgrade plant 500 tons per day. Please confirm how much sulphur can be reduced in our plant.
Can this dryer dry pine wood shavings? And if so at what capacity? My shavings are 80% wet and needs to come down to 8% or 10% moisture
Please can you sent me the details and process cost of the Iron ore dryer. And the price of the machines
2 Tons/PH Pellet plant,Raw material: Biomas residus like rice husk. I am interested to buy biomass drying &pellet plant. Can I use agricultural waste too in your machine?
Coffee spent drying 55% to 25%, may I get the price of the Steam Tube Rotary Dryer model: DLSG1210, capacity 40 ton/day please.
Need the price for the complete set up for Hammering -Crushing, Drying, Pressing, cooling, sorting packing in an automated line with site requirement details.
I am interested in setting up Biomass Pellet Production Line. Please let me know the setup cost of the Pellet Production Line.--DLKL2000
