The document discusses the design and operation of a mechanical vapor recompressor (MVR) system. The MVR system uses a steam ejector or compressor to recover condensate from the final condenser. It then returns the recovered condensate to the early effect stages to increase thermal efficiency. The system allows for concentration of the feed from 12% total dissolved solids to a higher concentration in the final concentrate outlet stream while recovering condensate for reuse.

1. ES 644
Industrial
Pollution
Prevention and
Clean Tech.
Lecture 18
Dr. Shyam R. Asolekar
M.P.C.B. Chair Professor
Environmental Science and Engineering Department
Indian Institute of Technology Bombay
Powai, Mumbai 400 076
+91-22-2576 7867 (Office - Direct)
+91-22-2576 7851 (Office - CESE)
+91-22-2576 4650 (Fax)
asolekar@iitb.ac.in
asolekar@gmail.com
1
© Prof. Shyam R. Asolekar, I.I.T. Bombay (2021)
Mechanical Vapor
Recompressor
(Design)

2. 2
2
nd
Effect
Steam
Feed Inlet
1250 kg/hr
12% TDS
Saturated
Steam
Condensate Condensate
1
st
Effect
Steam
= =
1st Effect 2nd Effect
=
3rd Effect
Condensate
Primary
Surface
Condenser
Secondary
Surface
Condenser
From CT
To CT
Settler
Centrifuge Concentrate
Outlet
Condensate
Outlet
Balance
Tank

3. 3
Final
Concentrated
Liquid
Recovered
Condensat
e
Steam Ejector
(or Compressor)
& Condenser

4. 4
©
Prof.
Shyam
R.
Asolekar,
I.I.T.
Bombay
(2021)

5. 5
©
Prof.
Shyam
R.
Asolekar,
I.I.T.
Bombay
(2021)

6. Multiple Effect Evaporator (MEE) (3/3)
6
R.O. Reject
as Feed
Saturated
Steam Recovered
Condensate
Final
Concentrated
Liquid
Condensate Condensate
1
st
Effect
Steam
= =
Steam Ejector
(or Compressor)
Condenser
1st Effect 2nd Effect