Rotary Dryer Manufacturer,Supplier and Exporter in India
Product Code : EL-TWL-9189
Jlab Export is a leading Rotary Dryer Manufacturer,and suppliers in India
A rotary dryer dries wet solids inside a slowly turning, slightly inclined cylinder with hot air blown through it. In this unit a blower pushes air through a heating chamber and along the shell against the flow of solids. A motor and reduction gearbox turn the shell at low speed, and wet feed enters at one end while dry material leaves at the other.
Specifications
| Drying method | Forced draft of hot air, counter-current to the solids |
| Air supply | Blower through a heating chamber |
| Shell | Long cylindrical shell, slightly inclined towards the outlet, on two support brackets |
| Shell drive | Electric motor and reduction gearbox, low rpm |
| Internal flights | Lift the solids and shower them through the hot air |
| Air control | Flow control valve and by-pass valve |
| Experiments | Batch drying characteristics of a solid; operation of a rotary dryer |
| Floor space | 1.5 m x 2 m |
| Electricity supply | 1 phase, 220 V AC, 4 kW |
| Other utility | Wet solid |
| Minimum order quantity | 1 unit |
| Dispatch time | Usually 14–18 working days |
| Manufacturer | JLab (Jain Laboratory Instruments Pvt Ltd), Ambala, India |
Drying Experiments for Chemical Engineering Students
The main experiment finds the drying characteristics of a solid under batch conditions. Students load a weighed charge of wet solid, start the blower and heater, and take small samples at fixed intervals. The moisture in each sample is found on an Infra Red Moisture Balance, or by weighing it before and after drying in a Hot Air Oven.
Moisture content on a dry basis is plotted against time, and the drying rate against moisture content. The curves show a constant-rate period, a falling-rate period and the critical moisture content between them. Further runs at other air flows, set with the flow control and by-pass valves, show how air velocity changes the rate. A Probe Type Anemometer Digital at the air inlet gives the velocity for each run.
Frequently Asked Questions
Why is the shell inclined and fitted with flights?
The slope carries the solids from the feed end to the discharge end as the shell turns. The flights lift the solids and let them fall through the hot air, so far more particle surface meets the air than in a still bed.
Why does the hot air flow against the solids?
In counter-current flow the hottest, driest air meets the nearly dry solid close to the outlet, and the cooler, moister air meets the wet feed. A difference in moisture between air and solid is kept along the whole shell, which keeps drying going.
What causes the constant-rate and falling-rate periods?
At first the particle surfaces stay wet, and water evaporates as it would from an open water surface, so the rate holds steady. Below the critical moisture content the surface dries out. Water must then move from inside the particles, and the rate drops.
How is moisture content on a dry basis worked out?
Weigh a sample, dry it completely and weigh it again. The loss in mass is the water. Divide that by the mass of the dry solid to get kilograms of water per kilogram of dry solid.
What does the lab need to install the dryer?
Allow a floor space of 1.5 m x 2 m and a single-phase 220 V AC supply rated for 4 kW. A stock of wet solid is needed for the runs, along with a balance for weighing the charge and samples.
Other Dryers for the Unit Operations Lab
- Forced Draft Tray Dryer (tray weighed on a balance during drying)
- Natural Draft Tray Dryer
- Fluidized Bed Dryer (heated air through a column)
- Tray Dryer
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Last updated: 6 November 2026
