Multi-Effect Evaporation Plant
Concentrate process liquids using an evaporation arrangement selected for the feed. ATTOMO provides engineering and equipment for multi-effect evaporation duties in distillery and other specified process applications.
Process and equipment approach
A multi-effect evaporator reuses vapour from one effect as a heating source in another effect operating at a suitable lower pressure. The number of effects, heating arrangement and circulation design depend on the available temperature difference, boiling-point elevation, viscosity, fouling and product sensitivity.
Applications and product requirements
MEE is used to concentrate process liquids and selected effluent streams by removing volatile liquid, usually water. Distillery stillage and suitable chemical solutions are examples of duties requiring a complete feed analysis. The concentrated stream, condensate and vents each need a defined destination; evaporation does not by itself make every output reusable.
Equipment and operating approach
The system review covers feed preheating, evaporation effects, vapour–liquid separation, inter-effect heat transfer, condensation and concentrate handling. Falling-film, forced-circulation or other arrangements are selected from viscosity, solids and fouling behaviour. Effect count is a trade-off between heat use, available temperature difference, equipment area and operational complexity. Thermocompression or mechanical vapour recompression needs a separate technical and economic assessment.
Define the right package.
The quotation defines the included equipment, services and battery limits.
- Evaporation vessels and heat-transfer equipment
- Vapour separation, condensation and vacuum interfaces
- Condensate and concentrate handling
- Controls and integration with upstream and downstream units
Materials and configuration
Heat-transfer surfaces, vapour bodies, piping and seals must withstand the feed and the more concentrated liquid at the hot end. Salt deposition, chlorides, cleaning chemistry and corrosion behaviour matter. Inspection access, suitable circulation, entrainment separation, cleaning connections and sampling should be specified. Concentration changes physical properties, so feed-only data are not sufficient.
Utilities and operation
Steam pressure and quality, cooling-water conditions, electrical load, vacuum performance and cleaning utilities affect the design. Boiling-point elevation and non-condensable gases reduce the useful temperature difference. Steam economy is a defined mass ratio under stated conditions, not a universal number equal to the number of effects. Condensate quality must be tested before its reuse is accepted.
Information for your enquiry.
Share the information you already have. Early-stage enquiries are welcome.
- Feed rate and composition
- Initial and target solids concentration
- Viscosity, fouling and temperature sensitivity
- Steam, cooling and effluent-treatment conditions
Frequently asked questions
Does an MEE alone guarantee zero liquid discharge?
No. It concentrates a stream. A complete ZLD scheme also needs appropriate condensate treatment, residual concentrate or solids handling and a verified water balance.
Will the evaporator never require cleaning?
Cleaning requirements depend on feed and operating conditions. Access, cleaning methods and maintenance should form part of the design.
How many effects should the plant have?
The answer depends on evaporation load, temperature limits, steam and cooling conditions, boiling-point elevation and cost. More effects are not automatically the best solution.
Is the condensate always clean water?
No. Volatile contaminants and liquid carryover can affect it. Specify condensate quality, separation measures and any treatment required for the intended reuse.
What test data help with a fouling feed?
Provide composition and physical properties over the concentration range, deposit history and cleaning experience. Trials may be needed where scaling or product stability is uncertain.
Related solutions
Evaporation within a ZLD scheme
A zero-liquid-discharge scheme must account for the complete effluent and water balance. MEE concentrates a suitable stream; evaporation alone does not establish ZLD. The project must also address condensate reuse quality, final concentrate or solids handling, vents and other liquid streams.
Define ATTOMO’s evaporation and relevant drying equipment scope separately from pretreatment, biological treatment, polishing, utility generation and other customer or third-party packages. The selected treatment train depends on characterised feed, contaminants, variability, reuse requirements and the applicable project conditions.
For an enquiry, provide flow and composition data, solids and fouling information, required water-reuse quality, concentrate-disposal basis and utility availability. The proposal identifies sampling/design responsibilities, package interfaces and the acceptance basis.