Batch solids / Indirect heating
Double Cone Vacuum Dryer
A double cone vacuum dryer heats a batch indirectly while the vessel turns. It is a candidate for solids that need reduced pressure or controlled exposure to oxygen. Share batch volume, bulk density and the liquid to remove. Sticky pastes and solvent-bearing feed need a specific process and safety review.
Portfolio Demo · No equipment sales or live enquiries
A Good Fit When
Solids can tumble and discharge as a batch. The project needs indirect heating and reduced pressure. Heat-sensitive or oxygen-sensitive feed needs trials and an agreed atmosphere design.
Not the First Choice When
The project needs continuous flow, or sticky paste cannot move or leave the vessel. Unknown solvent and corrosion properties prevent a useful selection review.
01 / Separate volume from batch mass
Sample Specifications
Sample specification data for website demonstration only. Do not use for equipment selection or purchasing.
Sample scenarios, not rated machine capacities. Values marked “Supplier to confirm” need project data and testing.
| Parameter | Unit | V-01 | V-02 | Basis / status |
|---|---|---|---|---|
| Feed type / mode | — | Water-wet solids / batch | Water-wet solids / batch | Assumed input |
| Total vessel volume | L | 500 | 1000 | Assumed input |
| Loading fraction | % of total volume | 40 | 40 | Assumed input |
| Working volume | L | 200 | 400 | Calculated example |
| Wet feed bulk density | kg/L | 0.60 | 0.60 | Assumed input |
| Wet load | kg/batch | 120 | 240 | Calculated example |
| Commercial model | — | No model assigned | No model assigned | Supplier to confirm |
| Operating / design vacuum | mbar abs | Process / vessel review required | Process / vessel review required | Supplier to confirm |
| Jacket temperature / design pressure | °C / bar(g) | Process / vessel review required | Process / vessel review required | Supplier to confirm |
| Rotation speed / motor power | rpm / kW | Project-specific | Project-specific | Supplier to confirm |
| Heat source / dimensions | type / mm | Project-specific | Project-specific | Supplier to confirm |
| Batch cycle time | h | Process trial required | Process trial required | Supplier to confirm |
Working volume = total volume × 40%. Wet load = working volume × 0.60 kg/L. The 40% loading fraction is an example, not a recommended fill level. With no cycle time given, these batch masses cannot be converted to kg/h. Vessel volume does not determine vacuum or jacket design values.
02 / Define the whole batch
Project Data Required
State whether each amount refers to wet feed, dry product or liquid content. Mark missing data as “Unknown”.
- Load and handling
- Wet batch in kg/batch, bulk density with units, particle form, tumbling and discharge behaviour.
- Liquid to remove
- Water or named solvents, initial and target content, measurement method, safety and corrosion data.
- Heat and endpoint
- Product temperature limit, required final quality, desired cycle and available heating/cooling utilities.
- Containment and cleaning
- Contact material needs, oxygen sensitivity, closed charging/discharge requirements and cleaning method.
RFQ workflow / Local demo
See How the RFQ Workflow Works
This is a local form demo. Use sample details only. Nothing is sent to a supplier or saved by this site.
Include the material, feed form, capacity with units, moisture in and out, temperature limit and available utilities. Write “Unknown” for values you do not have.
The demo checks required fields and text length. It does not select equipment or provide a price.
03 / Review heat and vapour paths
Working Principle
- Contain the batch. The vessel holds a defined charge of solids.
- Establish reduced pressure. The agreed vacuum system sets the process conditions.
- Transfer heat indirectly. The jacket supplies heat while the vessel tumbles the solids.
- Remove vapour. Vapour passes to the specified recovery and vacuum equipment.
- Confirm the endpoint. Sampling and discharge follow the agreed process and handling plan.
Vacuum, heat transfer and material behaviour work together. Reduced pressure alone cannot predict drying time or guarantee product quality.
Material Suitability
| Material form | Review objective | Main question |
|---|---|---|
| Water-wet solids | Batch moisture removal | Can the material tumble and discharge? |
| Heat-sensitive solids | Control product exposure | Which temperature and time preserve quality? |
| Oxygen-sensitive solids | Control the atmosphere | What containment and gas system are needed? |
| Solvent-wet or corrosive solids | Specialist process review | Are materials, recovery and protective systems suitable? |
Pastes that stick may not tumble effectively. Test movement through the whole drying cycle, including the final discharge.
Scope of Supply
Define vessel equipment separately from the utility and recovery systems.
Core scope to confirm
Rotating vessel, jacket, drive, support frame and controls. Specify contact materials and required inspection records.
Separately agreed
Vacuum unit, condenser, receivers, heating/cooling circuit, containment and guarding. Confirm connection points and responsibilities.
Client site preparation
Utility services, foundations, loading access and waste handling under the agreed installation scope.
Utilities and Site Conditions
Allow for the full rotation envelope, charging height, discharge container and maintenance access. Supply heating and cooling details, electrical power and vacuum-system requirements. Review the route for vapour, condensate and exhaust before fixing the layout. Confirm cleaning and drainage arrangements.
Options to Review
Discuss contact materials, surface finish, closed charging, sampling and solvent recovery. Inert gas, explosion protection and corrosion measures require a specific assessment. Vacuum alone does not establish a safe atmosphere. This demo includes no default safety certification or guaranteed recovery rate.
Testing, FAT and Acceptance
Agree the wet charge, endpoint test and allowable product temperature. Record the temperature and pressure history, final liquid content, material movement and discharge. Verify material records, seals and the agreed vessel/control checks during factory acceptance testing (FAT).
For solvent-bearing feed, define recovery measurements and review compatibility, containment and protection before testing. Agree limits and sampling methods in advance; a sample volume calculation cannot prove process performance.
Vacuum Dryer Questions
Is working volume the same as total volume?
No. Total volume describes the vessel. Working volume is the part used by the charge. The sample 40% fraction is an assumption that requires project review.
Why is bulk density needed?
It connects the space occupied by wet solids to their mass. State the units and test condition; density can change with moisture and packing.
Does vacuum alone set drying time?
No. Liquid content, product behaviour, heat transfer, pressure and the final target all matter. A representative trial is needed to estimate time.
Can solvents be recovered?
A suitable condenser and collection system may be specified after reviewing the solvent. Recovery efficiency and safe handling need agreed design conditions and testing.
How is the product heated?
Heat passes through the jacketed vessel wall. The heating medium, product temperature limit and control method must be selected together.
What determines a batch cycle?
Include charging, drying, any cooling, discharge and required cleaning. Drying time alone is not the full cycle or a reliable hourly production rate.
Prepare a Clear Batch Brief
Try the local workflow with sample project details.