I would like to ask everyone, the steam-water separator in the air bag of your medium-pressure steam generator is severely corroded, how to solve it?

It is mainly caused by substandard water quality. It is recommended that you strengthen the analysis and management of water quality to cure it. According to our boiler, here are some of the most critical and often concerned indicators for boiler water control.: oxygen content in water: Less than 10μg/L ； Boiler feed water pH: 8.5～10.0 ； Boiler water in steam drum: PH9.0～10.5, phosphate: 5～20mg/L ； Furnace water conductivity: 0～150μS/cm ； SiO2 content in boiler water: Less than 4000μg/L. This post was last edited by zhenghemqx on 2009-2-3 21:19 ]

, Boiler water quality standards 1. The feed water of steam boilers and steam-water boilers should generally be treated with chemical water outside the pot. The water quality should comply with the requirements of Table 1. Table 1 Project water supply pot water >1.0 >1.6 >1.0 >1.6 Rated steam pressure, MPa ≤1.0 ≤1.0 ≤1.6 ≤2.5 ≤1.6 ≤2.5 Suspended solids, mg/L ≤5 ≤5 ≤5 Total hardness, mmol/L ≤0.03 ≤0.03 ≤0.03 Without superheater 6-26 6-24 6-16 Total alkalinity, mmol/L With superheater ≤14 ≤12 pH (25℃ ≥7 ≥7 ≥7 10-12 10-12 10-12 Dissolved oxygen, mg/L3) ≤0.1 ≤0.1 ≤0.05 1) The basic unit of hardness mmol/L is c(1/2Ca2+, 1/2Mg2+), the same below. 2) The basic unit of alkalinity mmo1/L is c(OH-, 1/2CO2-3, HC03-), the same below. 　 For boilers with low steam quality requirements and without superheaters, the upper limit of the alkalinity index can be appropriately relaxed after the user reports to the local boiler and pressure vessel safety supervision agency for approval. 3) When the boiler's rated evaporation capacity is greater than or equal to 6t/h, oxygen should be removed. If local corrosion is found in a boiler with a rated evaporation capacity less than 6t/h, deoxygenation measures should be taken in the feed water. The oxygen content of the boiler feed water for steam turbines should be less than or equal to 0.05mg/L. 4) If it is difficult to measure dissolved solids, indirect control can be achieved by measuring conductivity or chloride ions (C1-), but the ratio between dissolved solids and conductivity or chloride ions (Cl-) should be determined based on experiments. This ratio relationship should be retested and revised regularly. 5) The relative alkalinity of fully welded boilers does not need to be controlled. 6) Only oil-fired and gas-fired boilers2, steam boilers with rated evaporation capacity less than or equal to 2t/h, and rated steam pressure less than or equal to 1.0MPa and steam-water boilers (if there are no special requirements for steam and water quality) can also use in-pot dosing treatment. However, it is necessary to strengthen supervision on boiler scaling, corrosion and water quality, and do a good job in dosing, sewage discharge and cleaning. The water quality should comply with the requirements in Table 2. Table 2 Project feed water boiler water suspended solids, mg/L ≤20 Total hardness, mmol/l ≤4 Total alkalinity, mmol/l 8-26 pH (25℃) ≥7 10-12 Dissolved solids, mg/L <5000 3. The feed water of pressurized hot water boilers should be treated with water outside the pot. For non-tube frame pressure hot water boilers and normal pressure hot water boilers with a rated power of less than or equal to 4.2MW, in-pot dosing treatment can be used. However, the scaling, corrosion and water quality of the boiler must be strengthened, and the dosing work must be done carefully. The water quality should comply with the provisions of Table 3. Table 3 Project chemical treatment inside the pot Chemical treatment outside the pot Feeding pot water Feeding pot water Suspended solids, mg/L ≤20 ≤5 Total hardness, mmol/L ≤6 ≤0.6 . PH (25℃)1) ≥7 10-12 ≥7 Dissolved oxygen, mg/L2) ≤0.1 Oil content, mg/L ≤2 ≤2 1) Control the pH value of the pot water at 10-12 by adding chemicals. 2) The feed water of pressure-bearing hot water boilers with a rated power greater than or equal to 4.2MW should be deoxygenated. The feed water of pressure-bearing hot water boilers and atmospheric pressure hot water boilers with a rated power less than 4.2MW should be deoxygenated as much as possible. 4. The feed water of once-through (cross-flow) boilers should be treated with chemical water outside the boiler. The water quality should be based on the standard in Table 1 that the rated steam pressure is greater than 1.6Mpa and less than or equal to 2.5Mpa. 5. The water quality indicators of waste heat boilers and electric boilers should meet the requirements of boilers of the same type and parameters. 6. Water quality inspection methods should be implemented in accordance with Appendix A (Appendix of the Standard).

It is mainly caused by substandard water quality. It is recommended that you strengthen the analysis and management of water quality in order to cure it. We also add trisodium phosphate. Now I’ll give you the standards for boiler water quality.: Boiler water quality standards $ A( f; The feed water of steam boilers and steam-water boilers should generally be treated with chemical water outside the boiler, and the water quality should meet the following regulations ( {7 c& ^+ O6 g Project feed water suspended solids, mg/L ≤20 5 W0 x4 I: T3 i4 x" ^# a Total hardness, mmol/l ≤4 # X) P# C2 h9 l4 Q, ~2 Y+ ] % a& v Total alkalinity, mmol/l 8-26 pH (25℃) ≥7 10-12 Dissolved solids, mg/L <5000

1. To prevent salt formation in the turbine, the main thing is to control the quality of medium-pressure steam and ensure that the steam is qualified. 2. Because the sodium ion content in the steam exceeds the standard. Once the steam-water separation in the boiler is not good, the sodium ions in the steam will exceed the standard. Salt formation may occur on turbine blades or steam pipes. 3. It may be caused by overdosing. Unsatisfactory conductivity of condensate should be completely solved, rather than just adding medicine. 4. Because the chloride ions contained in the medium-pressure deoxygenated water exceed the standard, salt formation occurs in the turbine.