-
17
-
Circulating cooling water treatment mainly to resolve the water scale, corrosion,
fouling and microbiological. Specifically, control of corrosion rate is less than 0.125
2
(mm / a); year dirt coefficient 0.00017 ~ 0.00052m • K / W, the anaerobic bacteria
3
per milliliter of water is less than 10 . In order to achieve the above requirements, it is
necessary to add appropriate scale inhibitors to prevent scaling, add corrosion
inhibitor to prevent corrosion, add peeling biocide to eliminate microorganisms.
However, the situation is not very simple, because the impact are many factors, such
as added water quality, recycled water concentration multiple, recycling water
quality, flow rate, structure and materials of heat exchanger, process fluid leakage
and water temperature, every factory is different. Therefore, the circulating cooling
water treatment prescription is not the same.
2 +
First, to control the content of Ca , decrease it to make the water soften. The
following four methods for users to have a reference:
1. Ion exchange resin method
2. Scale Inhibitor
3. Corrosion inhibitor
4. Biocide
8.4.Water quality standards
Direction
Item
(
ppm
)
Cooling
water
standard
(
1
)
corrosion
scale
6
.
0
~
8
.
0
6
.
0
~
8
.
0
○
○
○
cl
-
○
SO
4
--
○
○
○
Alkali
CaCO
3
○
Basic
factor
Full
hardness
○
S
--
○
NH
4
+
○
Proposed
factor
(
3
)
SiO
2
○
Feed
water
standard
PH(25
)
℃
conductivity
ppm
<200
<200
<200
<100
<500(4)
<50
<50
<0.3
<1.0(2)
<0.1
<50
<30
<30
<200
ppm
ppm
ppm
ppm
ppm
ppm
ppm
ppm
Unknown
Unknown
Unknown
Unknown
INSTALLATION & INSTRUCTION
MANUAL
