Water quality standard table for circulating cooling water

Water quality standard table for circulating cooling water

project
unit
Requirements and conditions of use
allowance
Suspended matter
Mg/L
Determined according to production process requirements
<20
Heat exchange equipment is plate type, finned tube type, spiral plate type
<10
PH value
Based on the formulation of the drug
7-9.2
Methyl orange alkalinity
Mg/L
Determined according to the formulation of the drug and working conditions
<500
Calcium ion
Mg/L
Determined according to the formulation of the drug and working conditions
30-200
Ferrous ion
Mg/L
<0.5
Chloride
Mg/L
Carbon steel heat exchange equipment
<1000
Stainless steel heat exchange equipment
<300
Sulfate ion
Mg/L
The requirements for the concrete material in the system shall be in accordance with the current provisions of the Geotechnical Investigation Specification > GB50021 94.
The sum of sulfate ion and chloride ion
<1500
Silicic acid
Mg/L
<175
Product of magnesium ion and silicon dioxide
<15000
Free chlorine
Mg/L
At the backwater main
0.5-1.0
Petro
Mg/L
<5
Oil refining company
<10
Note: The methyl orange basicity is based on calcium carbonate;
Silicic acid is based on silica;
Magnesium ions are based on calcium carbonate.
3.1.8 The water quality standard of the closed system circulating cooling water shall be determined according to the production process conditions;
3.1.9 Open system circulating cooling water design concentration factor should not be less than 3.0. Concentration multiple can be calculated as follows:
N=Q M /Q H +Q W (3.1.9)
Wherein N concentration multiple;
Q M replenishment water volume ((M 3 /H);
Q H discharge water volume ((M 3 /H);
Q W wind blow loss water volume (M 3 /H).
3.1.10 Open system The number of heterotrophic bacteria in the circulating cooling water should be less than 5 × 10 5 / ML slime should be less than 4ML / M 3 ;
Table 10-3 Water quality standards for boiler medicated water treatment
Table 10-4 Water quality standards for steam boilers treated with chemical water outside the boiler

project
unit
Water supply
Pot water
Suspended matter
Mg/L
<20
PH value
》7
10-12
total hardness
Mg/L
<4
Dissolved solids
Mg/L
<5000
Relative alkalinity
Mg/L
Total alkalinity
Mg/L
8-26

project
Water supply
Pot water
Rated steam pressure, MPA
"1
"1
"1.6
>1.6
<2.5
<1
>1
<1.6
>1.6
<2.5
Suspended matter,
<5
<5
<5
total hardness
<0.03
<0.03
<0.03
Total alkalinity
No superheater
6-26
6-24
6-16
Superheater
<14
<12
PH
>7
>7
>7
10-12
10-12
10-12
Oil content
<2
<2
<2
Dissolved oxygen
<0.1
<0.1
<0.05
Dissolved solids
No superheater
<4000
<3500
<3000
Superheater
<3000
<2500
Sulfite
10-30
10-30
Phosphate
10-30
10-30
Relative alkalinity (free sodium hydroxide / dissolved solids)
<0.2
<0.2
<0.2
Table 10-5 Water quality standards for hot water boilers

project
In-pot dosing
Chemical treatment outside the pot
Water supply
Pot water
Water supply
Pot water
Suspended matter
<20
<5
total hardness
<4
<0.6
PH
>7
10-12
>7
8.5-10
Dissolved oxygen
<0.1
<0.1
Oil content
<2
<2
<2

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