Description

MVR  Evaporation  plant  delivers  substantial  operational  cost  saving  in  areas  with  an  ample  supply  of  low-cost  electrical energy

Once  an  MVR  evaporation  plant  is  running,little  or  no  additional  steam  is  required.In  MVR  evaporation  plant,a

centrifugal fan  is  used  to  recompress the vapour to  a  higher  pressure,resulting  in  a  rise  in  temperature.This  means  that the  recompressed vapour can  be  used  as the evaporation  plant  heating  medium,while  the  condensate is  idea for preheating  of  the  feed  product

For  low  boiling  point  increases,single  stage  compressor  can  be  used  to fulfil  requireents  of designing.

For  high  boiling  point  increases,we  will   provide  two   designing:multiple-stage  compressors  ,single  stage  compressor combining   with   multiple-effect.

MVR evaporation  plant  almost don't  use  steam,but  electric energy  is  required  for  mian  energy source.

Power consumption of main motor of MVR are due to heat exchange area and evaporating temperature of evaporation plant: Heat exchange area  is  bigger and  in  result  power  consumption  is  lower,but  investment  of  equipment  is therefore  increased;

Evaporating temperature  is  higher  and  in  reuslt  power  consumption  is  lower,but  fouling  in  the  calandria  is  therefore  increased; Evaporating temperature is lower and in result power consumption is higher.

MVR be powerd by an electric motor,the rotaty speed of an  MVR can  be controlled  by an frequency converter,the rotary speed of an  MVR  may control evaporation  rate and final concentation of MVR evaporation  plant.

 

Particular  feature

■  Low  specific  energy  consumption

■  Gentle  evaporation  of  the  product  due  to  low  temperature  differences,largely  increase  product  quality,decrease  fouling.

■ Short residence times of the product  ,as a single-effect system  is  most often  used.

■  Only  a  small  area  condenser,requirement of little  cooling water.

■ High availability of the plants due to the simplicity of the process

■  Excellent  partial  load  behaviour

■  Low  specific  operating  costs

 

Fields of application

Particularly  suited  for  the  food  and  beveragesindustry

(evaporation  of  milk  ,whey  ,sugar  solutions),chemical   industry (evaporation  of  aqueous  solutions),the  salt  works  industry

(evaporation  of  saline   solutions),and  environmental  Protection technology  (concentration  of  waste  water).

MVR evaporation plant comparing with normal multiple-effect evaporation plant

Type	Multiple-effect evaporation plant /TVR evaporation plant	MVR evaporation plant
Energy sources	Steam	Electric power
Energy consumption of concentrating water of 1 ton,per hour	0.16-0.6 T	18-26  Kw

50T/h

Evaporation   rate:50T/h 0.8 RMB/Kw.

Unit  price  of  electric  power:0.8  RMB/Kw.

160 RMB/T

Unit price of steam:160 RMB/T 按1年8000小时

8000  hours,per  annum.

Type	4-effect evaporation plant	MVR evaporation plant
Energy consumption	Steam:11T/h	Electric power:1000Kw/h
Expense of energy consumption,per annum	14,080,000 RMB	6,400,000 RMB
Economizing expense,per annum	无 Zero	7,680,000 RMB

1. Evaporator 

2. Condener

3. Plate heat exchanger

4.MVR

5. Condensate Tank

A. Liquor

B.Product

C.Condensate   

D.Fresh steam   

E. Cooling  water 

F.Deaeration

Type Selection Criteria for Evaporation Plants

When we will design evaporation plants,various requirements must be considerated.These determinethe type of design,arrangement,the resulting process,cost of investments and running expense.

The most important requirements

Capacity and operation data

Name of Product

Feeding concentration(dry materials %

Feeding temperature

Final concentration (dry materials %)

Evaporation rate(T/h)

If crystallization,requirement of crystals

Requirement of controlling,automatization

Product properties

Viscosity and flow properties

Tendency of foaming

Fouling and precipitation

沸点Boiling Point

Utility requirements

Steam pressure /temperature

Temperature of Cooling water feeding

Voltage /frequency

Unit price of steam(RMB/T)

Unit price of electirc power(RMB/Kw)

Waste heat parameter

Waste vapour rate from dryer

Wet bulb temperature of waste vapour from dryer

Condensate rate from dryer

Condensate temperature from dryer

Liquefaction vapour rate

Liquefaction Vapour temperature

Others

Selectionof materials

Materialof heating pipe

Material of tubeplate

Materialof contacting with liquor

Material of Contacting with secondary steam

Requirement of surface finish

Energy efficiency ofevaporation plants

Multiple-effect evaporation plant

TVR evaporation plant

MVR evaporation plant

Waste heat evaporation plant