Mechanical Vacuum Boosters for MVR Evaporators & ZLD Plants

High-Capacity Vacuum Solutions for Evaporation, Concentration & Zero Liquid Discharge Systems

Respondent Precision Engineering Pvt. Ltd. (RPE) manufactures Mechanical Vacuum Boosters for demanding industrial vacuum applications, including MVR Evaporators, Zero Liquid Discharge (ZLD) Plants, Multiple Effect Evaporators, Concentrators and Crystallization Systems.

RPE Mechanical Vacuum Boosters are available in a wide capacity range and can be engineered as part of the vacuum system according to the required operating pressure, non-condensable gas load, process vapors, evaporator capacity and backing vacuum pump.

Mechanical Vacuum Boosters in MVR Evaporators

What is an MVR Evaporator?

MVR – Mechanical Vapor Recompression is an energy-efficient evaporation technology used to concentrate process liquids and industrial effluents.

During the evaporation process, vapor generated from the liquid is mechanically recompressed and reused as a heating medium.

Many MVR evaporation systems operate under controlled vacuum conditions to achieve the required evaporation temperature and process performance.

A properly engineered vacuum system helps:

• Establish the required vacuum during start-up
• Maintain the required process pressure
• Remove non-condensable gases
• Handle vacuum leakage and residual vapor loads
• Maintain stable operating conditions inside the evaporator

This is where an RPE Mechanical Vacuum Booster, working together with a suitable backing vacuum pump and process protection equipment, can be used.

Role of RPE Mechanical Vacuum Booster in an MVR System

The Mechanical Vacuum Booster is installed as part of the vacuum support system of the evaporator.

When correctly selected, the booster can provide a high volumetric pumping capacity at reduced pressures and assist the backing vacuum pump in maintaining the required process vacuum.

Main Functions

• High pumping capacity at low operating pressures
• Faster evacuation during system start-up
• Efficient handling of non-condensable gases
• Support for maintaining stable evaporator vacuum
• Reduced load on the backing vacuum pump under suitable operating conditions
• Improved vacuum-system response
• Suitable for continuous industrial operation

Important: The RPE Mechanical Vacuum Booster used in the vacuum system is separate from the main MVR vapor compressor. The MVR compressor recompresses process vapor, while the vacuum booster forms part of the vacuum-maintenance system.

Typical MVR Vacuum System Arrangement

A typical arrangement can be represented as:

MVR Evaporator / Vapor Space
↓
Vapor Separator / Condenser
↓
Knock-Out Pot / Moisture Separator
↓
RPE Mechanical Vacuum Booster
↓
Backing Vacuum Pump
↓
Discharge

Vacuum-System Function

The MVR Evaporator generates the vacuum load.

The Condenser / Vapor Separator removes the majority of condensable vapor.

The Knock-Out Pot / Moisture Separator helps protect downstream vacuum equipment from liquid carryover.

The RPE Mechanical Vacuum Booster provides high volumetric pumping capacity at the required vacuum level.

The Backing Vacuum Pump provides the necessary backing pressure for operation of the Mechanical Vacuum Booster.

Mechanical Vacuum Boosters in ZLD Plants

Zero Liquid Discharge – ZLD

Zero Liquid Discharge systems are designed to recover water from industrial wastewater while concentrating dissolved solids so that little or no liquid effluent is discharged from the plant.

A typical ZLD system may include:

• Pre-treatment
• RO / membrane systems
• MVR Evaporator
• Multiple Effect Evaporator
• Forced Circulation Evaporator
• Concentrator
• Crystallizer
• Centrifuge
• Condensate recovery system
• Vacuum system

Vacuum equipment can play an important role in the evaporation and concentration stages of the ZLD process.

Where RPE Mechanical Vacuum Boosters Can Be Used

RPE Mechanical Vacuum Boosters can be considered for vacuum systems associated with:

MVR Evaporators

For maintaining the required operating vacuum and handling non-condensable gases and vacuum-system loads.

Zero Liquid Discharge Plants

For high-capacity vacuum systems used with evaporation and concentration equipment.

Multiple Effect Evaporators

Where vacuum operation is required to reduce boiling temperature and support evaporation at controlled process conditions.

Forced Circulation Evaporators

For vacuum support in high-concentration evaporation duties.

Crystallizers

For process systems operating under reduced pressure during concentration and crystallization.

Concentrators

For maintaining controlled vacuum during removal of water or process solvents.

Vacuum Drying Systems

For removal of moisture or process vapors under reduced pressure.

RPE MVR Booster Construction

Mechanical Vacuum Boosters supplied by RPE for MVR Evaporator and ZLD applications can be manufactured using SS-304 or SS-316 components for process-contact applications.

MVR Booster Material of Construction

Component / Requirement	RPE Specification
MOC for MVR Application	SS-304 / SS-316
Impellers	SS-304 / SS-316
Wetted Casing Surfaces	Application-Specific Construction
Side Plates	Application-Specific Construction
Wetted Parts Coating	Ni-P Coating
Major Wetted Components	Impellers, Casing & Side Plates

Ni-P Coating on Wetted Parts

For MVR and ZLD applications, RPE provides Ni-P – Nickel Phosphorus coating on wetted components where specified for the process.

Major coated wetted components include:

• Impellers
• Casing
• Side Plates

The coating requirement is finalized according to the process medium and operating conditions.

RPE Standard Mechanical Vacuum Booster Features

Piston Ring + Double Lip Seal

RPE Mechanical Vacuum Boosters are provided with a Piston Ring + Double Lip Seal arrangement for reliable industrial operation.

Premium Bearings

RPE uses bearings only from internationally recognized manufacturers:

• SKF
• FAG
• NSK

Dynamically Balanced Impellers

RPE Mechanical Vacuum Booster impellers are dynamically balanced as per ISO 1940-1, Grade G2.5.

Precision balancing helps achieve:

• Smooth operation
• Reduced vibration
• Improved rotor stability
• Better bearing life
• Reliable operation at rated speed

Precision Timing Gears

RPE uses EN-353 gears, which are:

• Duly hardened
• Precision ground
• Manufactured to close tolerances

These gears provide accurate synchronization of the booster rotors.

Warranty

RPE Mechanical Vacuum Boosters are supplied with a 12-month warranty, subject to applicable warranty and operating conditions.

Wide Capacity Range for MVR & ZLD Projects

RPE manufactures Mechanical Vacuum Boosters in a wide range of capacities for different process requirements.

RPE Model	Nominal Capacity
MV-01	100 CMH @ 1500 RPM
MV-03	250 CMH @ 1500 RPM
MV-05	450 CMH @ 1500 RPM
MV-08	800 CMH @ 1500 RPM
MV-10	1000 CMH @ 1500 RPM
MV-16	1600 CMH @ 1500 RPM
MV-30	2950 CMH @ 1500 RPM
MV-50	5250 CMH @ 1500 RPM
MV-100	10400 CMH @ 1500 RPM
MV-150	15100 CMH @ 1500 RPM

This wide range enables RPE to cater to both compact evaporation systems and large industrial MVR/ZLD installations.

Industries Using MVR & ZLD Systems

RPE Mechanical Vacuum Boosters can be considered for MVR and ZLD applications in industries including:

• Chemical Manufacturing
• Specialty Chemicals
• Pharmaceutical Industry
• API & Bulk Drug Manufacturing
• Textile & Dyeing Industry
• Distilleries
• Food Processing
• Dairy Industry
• Pulp & Paper Industry
• Fertilizer Industry
• Agrochemical Plants
• Industrial Effluent Treatment
• Common Effluent Treatment Plants
• High-TDS Wastewater Treatment
• Process Industries
• Wastewater Recovery Systems

Protection of Mechanical Vacuum Booster

MVR and ZLD applications can involve significant quantities of vapor and condensate.

The Mechanical Vacuum Booster should therefore be protected against direct liquid carryover.

Depending upon the application, the vacuum system may include:

• Vapor separator
• Surface condenser
• Knock-out pot
• Moisture separator
• Demister
• Drain arrangement
• Suitable instrumentation
• Vacuum control system

Proper upstream separation is important for reliable operation of the vacuum booster.

Selecting the Correct RPE Booster

Selection of a Mechanical Vacuum Booster for an MVR Evaporator or ZLD Plant should not be based only on CMH capacity.

RPE evaluates important parameters including:

• Evaporator capacity
• Required operating vacuum
• Absolute suction pressure
• Differential pressure
• Non-condensable gas load
• Vapor load after condensation
• Process medium
• Process temperature
• Chemical composition
• Existing condenser capacity
• Backing vacuum pump capacity
• Suction and discharge conditions
• Material of construction
• Coating requirement
• Continuous or batch operation
• Available motor power
• Site conditions

Based on these parameters, the appropriate Mechanical Vacuum Booster + Backing Vacuum Pump combination can be selected.

Why RPE for MVR & ZLD Vacuum Systems?

Wide Booster Range

Mechanical Vacuum Boosters available from 100 CMH to 15100 CMH.

MVR-Specific Construction

SS-304 / SS-316 construction available for MVR and ZLD vacuum duties.

Ni-P Coated Wetted Components

Ni-P coating available on critical wetted components including:

Impellers + Casing + Side Plates

Premium Bearings

SKF / FAG / NSK

Precision Balanced Rotors

Impellers dynamically balanced to ISO 1940-1 Grade G2.5.

Precision Timing Gears

EN-353 hardened and ground gears manufactured to close tolerances.

Reliable Sealing

Piston Ring + Double Lip Seal arrangement.

Application Engineering

Booster selection can be matched to the actual MVR/ZLD process parameters and backing vacuum system.

12-Month Warranty

RPE Mechanical Vacuum Boosters are supplied with a 12-month warranty.

RPE Mechanical Vacuum Booster for Your MVR / ZLD Project

If you are designing or upgrading an:

MVR Evaporator | ZLD Plant | Multiple Effect Evaporator | Crystallizer | Concentrator | Vacuum Evaporation System

RPE can assist in selecting an appropriate Mechanical Vacuum Booster for your process.

For technical selection, provide:

Evaporator Capacity + Required Vacuum + Process Medium + Process Temperature + Vapor Load + Existing Vacuum Pump + Condenser Details

Contact RPE for technical selection, sizing, pricing and customized Mechanical Vacuum Booster solutions.