WSP10809

• File Number: 8273.500
• Description: Colorado River Basin Salinity Control - Federal Agency Reports - EPA
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 4/1/1978
• Title: Integrating Desalination and Agricultural Salinity Control Alternatives
• Water Supply Pro - Doc Type: Report/Study

Calculations of various flow rates and limitations include:

(1) BPR;
f\) [ 1-(50/TOO,) TDS. - 50 l............. (53)
00 BPR ~
c..;l = max or
""" 900/C - 1 80,000 - TDS.
a. ~
~
(2) Cb by Eq. 48;
(3) Cw;

Cw
Cw

= C (3.2
P
by Eq. 50

- BPR) (no cooling towers)
(no cooling towers)

. . . . . . . . . . . . . . . (54)

(4) C. by;
~

Ci = Cp (1.15 + BPR) (cooling towers) ................. (55)

Ci by Eq. 52 (no cooling towers)

The mathematical cost simulation for VTE-MSF process is
given in Table 2.

Vapor Compression - VTE-MSF

An alternative to generating the necessary process heat
through steam is to employ another enthalpy principle, i.e. that
as a vapor is compressed, its pressure and temperature increase.
A vapor compressor takes the low temperature water vapor from
the VTE outlets, compresses it to increase the temperature and
then feeds it back into the next MSF stage, thereby replacin~
the high temperature steam supply.

The applicable conditions for the VC-VTE-MSF process are
the same as noted previously except this process favors rela-
tively warm feedwaters. Hydraulic characteristics for BPR are
determined from Eq. 53. Brine volume is then calculated using
Eq. 48, and cooling waters by:

Cw
Cw

= Cp (2.2
= C (1.5
P

- BPR)
- BPR)

(cooling towers) .................. (56)
(no cooling towers) ............... (57)

Total intake rate is computed by:

C. = c (1.1 + BPR) ................................... (58)
~ P
or for systems not using cooling towers, Eq. 52.
A summary of the cost simulation is given in Table 3.

36