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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