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Mechanical Vapor Re-Compressor

Overview

Mechanical Vapour Recompression-(MVRE)is the most efficient Evaporation Technique driven by electrical energy thus reduces operating cost of steam and cooling water required in the process.

  • Low Operating Cost System.

  • No Cooling Water Required.

  • No External Heat Source Required.

  • Low Specific Energy Consumption.

Evaporation Technology With Mechanical Vapour Recompression

Maximum Water Recovery from Waste Stream

MVR Evaporators

Various evaporation techniques are used to concentrate fluids or to achieve Zero Liquid Discharge (ZLD) in wide-ranging industries including dairy, food, pharmaceutical, and chemical, textile, paper etc. Evaporating water from solution is an energy-intensive process. It is often one of the main contributors to a plant’s operating costs

Over the past 10-15 years, Mechanical vapor recompression (MVRE) has become the preferred system in many industries, because of its economy and simplicity of operation. In most instances, the need for steam to provide heat for the evaporation and cooling water for condensing the overhead vapors is virtually eliminated; by installing MVRE. A wide range of turndown is possible in MVRE.

Mechanical Vapor Re-compressor is a system in which the Centrifugal Turbo Fan is used to recompress the vapors generated by Evaporator at higher pressure using Electrical power. In MVR these same vapors are used again in evaporator as a heating medium. This eliminates the use of fresh steam.

The system operates at a partial vacuum, reducing the boiling temperature and most of the process heat is recovered and recycled within the preheater and evaporator unit. Overall specific energy requirements are dramatically reduced in comparisonto conventional distillation/Evaporation systems

MVR becomes a CHEAPER option as compared to conventional multiple effect evaporators.

Our MVRE Evaporator starts from 500 Ltr/hr to Evaporating up to 100000 Ltrs/hr of water at 75 kg of water evaporated per kilowatt of power consumed.

Principle of Operation

The preheated wastewater stream enters an evaporator chambers (6) from boiling chamber/separation tank (1) through Recirculation pump which is circulating heated waste water through the main heat exchanger (6) and back into the separation tank (1).

Steam flows up through the mist pad to inlet side of MVR fan (5). Compressed steam from MVR fan (5) is forced through the steam side of main heat exchanger (6) giving up latent heat to the counter flowing wastewater.High temperature condensate flows out of the main heat exchanger (6).

Concentrate (3) is periodically discharged based on temperature, conductivity or time from separation tank (1). Incoming wastewater (4) is preheated as it passes through a heat exchanger transferring heat from and cooling the exiting pure condensate (2) and concentrate (3) flows.

Typical Single-Effect MVRE Evaporator with Single Stage MVR Fan

Typical Double-Effect MVRE Evaporator with Two stages MVR Fans

Industries & Applications

  • Pharmaceutical Industry

  • Textile Industry

  • Chemical

  • Food & Beverages Industry

  • Dairy

  • RO Reject

  • Waste Water

  • Distilleries

  • Paper Plant

  • Cement

  • Sugar

  • Effluent Treatment

Advantages

  • Found to be the most economical choice when there is no boiler available or when electrical power is priced competitively in comparison to steam.

  • Gentle evaporation of the product due to low temperature differences.

  • Reduced load on cooling towers since no residual vapors, due to the complete recompression of the process vapor, cooling water consumption is negligible.

  • Easy capacity controlling through variable frequency drive (VFD).

  • Efficient vapor compression technology to minimize operating Cost.

  • Due to absence of the recycled cooling water, electricity, water and maintenance costs are saved. (low maintenance).

  • High-water recovery rate – up to 98%.

  • Compact, portable, and easy to install.

  • Recycling the latent heat of the steam and avoiding fresh steam consumption, makes MVR more energy saving.

  • High heat efficiency, energy-saving, zero contaminant