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Multiple Effect Evaporators

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For RO Reject | Effluent Treatment Plants | Zero Liquid Discharge (ZLD)

We are multiple effect evaporators manufacturer in Gujarat,India. Multi-Effect Evaporation is an important procedure adopted to economize the consumption of energy.

Multi Effect Evaporators are the instruments in which steam from an outside source is condensed in the heating element of the first effect. The boiling temperature at which the first effect operates is high enough so that the evaporated water can serve as the heating medium for the second effect. The vapors so formed are then sent to a condenser if it is a double effect evaporator.

The feed for the multi-effect type evaporator is generally transferred from one effect to another. This leads to the ultimate product concentration to reach only in the one effect of evaporator.

Multiple Effect Evaporators

What is Multiple Effect Evaporator (MEE)?

 

Basic Concept

Boil 5 Cups of Water Using  the heat from 1 Cup of Boiling Water. YES!. You read it right!

You can use of heat present in 1 cup of water to Boil 5 Cups of water.

In Industry Steam is used to evaporate water. The evaporated water is used to evaporate more water. The steam consumption to evaporate water is as mentioned below.

  • 110 kg steam required to evaporate 100 kg water.
  • 55 kg steam is requied to evaporate 100 kg water using Double effect Evaporator
  • 33 kg steam is required to evaporate 100 kg Water using Triple Effect Evaporator
  • 28 kg steam is required to evaporate 100 kg water using Quadruple Effect Evaporator
  • 22 kg steam is required to evaporate 100 kg water using Five Effect Evaporator.

So now, you can see the Industrial application of Multiple Effect Evaporators. Steam is a costly commodity. So compared to first example the steam requirement of fifth example is 20% of it. Means it is 5 times cheaper.

MEE BASIC PRINCIPLE

Application of Multiple Effect Evaporators

  • Effluent treatment to meet Zero Discharge Norms.
  • R.O. reject 
  • ETP treated water for Zero Discharge
  • Dairy Industries
  • Process Industries
  • Food Industry, etc.

Detailed Process Philosophy

  1. Utilities Required
  2. Heating medium – Steam or Thermic Fluid
  3. Cooling Tower
  4. Electricity

single effect evaporator

Working Principle of Single Effect Evaporator

  1. Important equiment of this system are Calendria, Evaporator/Flash Chamber, Circulation Pump.
  2. Steam is charged into the Calendria
  3. Process liquid is charged into the Evaporator
  4. The circulation pump circulates the Process liquid from Evaporator to Calendria continuously.
  5. The Process liquid gets heated up in the calendria and enters the Evaportor.
  6. This hot Process Liquid partialy gets converted into vapor
  7. This vapour escapes from the top of evaporator 
  8. This vapor is condensed using cold water from Cooling tower.
  9. This process keeps on going on and evaporation keeps taking place.
  10. As the water level in the Evaporator is falls, fresh feed is pumped in.
  11. The motive steam that was fed to the calendria is removed from the system using steam trap.
  12. This Steam Condensate ca be reused by the boiler, as it is not contaminated. 

Working Principle of a Multiple Effect Evaporator

Triple Effect Evaporator

Working principle — coming soon (Under Construction)

First Effect

  1. Feed tank is Filled up Process Liquid
  2. All Effects are filled up with Process Liquid up to the desired Level
  3. Motive steam at 5 kg/cm2 (Dry and Saturated) is Fed to the Callendria of First Effect.
  4. The Circulation pump  circulates the Process Liquid  from Flash Camber and Callendria then back to flash chamber
  5. In this operation the Process Liquid is heated up and flashed in the Flash chamber. 
  6. The Flashed Vapors vent out from the top of the Flash Chamber via the top duct. 
  7. The circulation is continuous
  8. The Process Liquid keeps Evaporating in the Flahs chamber.
  9. As the Process Fluid Evaporates the Liquid level is maintained by pumping the Liquid from Feed Tank.
  10. The Condensed Steam is withdrawn from the bottom of the Callendria with the help of a steam trap. 
  11. This condensed steam is sent back to boiler for reprocessing. 

Second Effect

  1. In this effect, the heating medium is the Water vapour from the First Effect.
  2. Similar to First Effect, the circulation pump continuously circulates the Process liquid between Callendria and Flash Chamber.
  3. The Vapors from First Effect enter the Callendria and heat the circulating Liquid.
  4. The Circulating Liquid gets heated up and Flashes in the flash chamber. 
  5. The vapors from Second effect rise from the flash chamber and vent out through the ducting at the top. 
  6. As the vapors evaporate the level in the Flash chamber drops
  7. The level in the Flash Chamber is maintained by pumping Liquor from the first effect, using the circulation pump of the first effect.
  8. The Condensed vapors of the first Effect are collected at the bottom of the callendria with the help of a steam trap.
  9. The Second Effect is operated in partial vacuum to facilitate boiling using vapors of first effect.

Third Effect

  1. In this effect, the heating medium is the Water vapour from the Second Effect.
  2. Similar to First Effect, the circulation pump continuously circulates the Process liquid between Callendria and Flash Chamber.
  3. The Vapors from Second Effect enter the Callendria and heat the circulating Liquid.
  4. The Circulating Liquid gets heated up and Flashes in the flash chamber. 
  5. The vapors from Third effect rise from the flash chamber and vent out through the ducting at the top. 
  6. As the vapors evaporate the level in the Flash chamber drops
  7. The level in the Flash Chamber is maintained by pumping Liquor from the second effect, using the circulation pump of the second effect.
  8. The Condensed vapors of the Second Effect are collected at the bottom of the callendria with the help of a steam trap.
  9. The Third Effect is operated in partial vacuum, but Greater than second Effect  to facilitate boiling using vapors of second effect.
  10. In third Effect, the vapors are condensed in a barometric condenser using water from the cooling tower.
  11. Barometic Seal tank, Barometic Condenser and Circulation pump form a circuit where water from the cooling tower circulates and condenses the vapors of the Third Effect.
  12. the Condensed vapors act as makeup water for the cooling tower.

Solid Separation

  1. As the Process Liquid keeps getting evaporated the concentration of the TDS keeps incresing.
  2. The third effect has maximum concentration of the TDS.
  3. On further evaporation the Salts start to crystalize in the Third effect.
  4. The Mother Liquor in the third effect is circullated through the Pusher Centrifuge
  5. This ML is then fed back to the Flash Chamber of third effect. 
  6. Thus Solids are Seperated in the Centrifuge and Vapors of Third effect are mixed with the cooling tower.

The makes the Entire Multiple Effect Evaporator a Zero Liquid Discharge (ZLD) System.

Utility Consumptions in a Multiple Effect Evaporator

Sr.No.
Plant
Steam
Consumption
Cooling Tower
Capacity
Power
Consumption
Space
Requirement
1
Single Effect
1100
200
5
3 m x 3
2
Double Effect
550
100
10
4 m x 5 m
3
Triple Effect
366
66
15
6 m x 7.5 m
4
Four Effects
280
50
20
6 m x 10 m
5
Five Effects
220
40
25
6 m x 12 m

How to read the table

*Steam  Consumption – kg of Steam per ton of water evaporated

*Cooling Tower Capacity – TR per Ton of Water Evaporated

*Power Consumption – HP per 10KL of Water Evaporation per day

*Eg. A typical 4 Effect Evaporator for 100 KL per day will need (100/24 x 280) = 1166 kg steam per hour, (100/24 x 50) = 208 TR cooling Tower, (100 /24X 20) =  200 HP Power Consumption.

Why Us?

VG Engineers is a pre-eminent manufacturer and supplier of Multiple Effect Evaporators. VG Engineers is continuously engaged in providing a comprehensive range of Multi-Effect Evaporators. Here we emphasize the standard provided, our specialized expertise works on advanced technology to fulfill the specified quality standards of your specific application. 

At VG Engineers we believe in serving customers up to their satisfaction within time and budget.
By following the client-based approach, we are referred to as the respected Multiple Effect Evaporators Suppliers. Being a vital element of processing industries, these evaporators are extensively demanded in several industries like dairy, food & beverages, sugar, and pharmaceutical industries. 

Further, we are a Multiple Effect Evaporators Manufacturer which supplies only those evaporators that are manufactured using the most effective quality raw material to satisfy predefined industry standards. Before supply , this machinery will be tested on various parameters. Clients could avail this range of Multiple Effect Evaporators in various specifications to fulfill their Requirements.

 Advantages of MEE

  • Suitable for giant scale & for continuous operation.
  • Highly economical in comparison to one effect
  • Multiple effects, or stages, are now wont to minimize the energy input required to evaporate or boil off undesirable water content.
  • The total evaporation achieved during this system is approximately the amount of effects times the energy input to the primary effect.

You can see more videos of our products and Trials on our YouTube channel

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