Consensus on Operating Practices for Control of Water and by coll.

By coll.

Ready through the warmth restoration Steam Generator Chemistry Limits activity staff and the Water know-how Subcommittee of the ASME learn and expertise Committee on Water and Steam in Thermal structures. This e-book is a vital better half to formerly released files ready to notify and train the reader and to advance solid chemistry keep watch over and working practices for steam and water utilization in thermal platforms

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Extra resources for Consensus on Operating Practices for Control of Water and Steam Chemistry in Combined Cycle and Cogeneration Power Plants: From the Center for Researc

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IWC-08-12. Unneutralized specific conductivity at 25oC, µS/cm LP Drum, if LP Drum Feeds Other Drums Parameter, Units Table 10b. 0 22 0 0 90 0 10 00 Figure 3. 0 00 19 00 21 DRUM WATER SILICA FOR 20 ppb SiO2 IN STEAM 00 22 00 23 Figure 4. 21 MPa) must be individually specified by a qualified water treatment consultant with regard to silica solubility and other components of internal treatment. (2) Maximum total alkalinity consistent with acceptable steam purity. If necessary, should override conductivity as blowdown control parameter.

Chloride, can cause corrosion in the tubing even when the sample pH at 25oC indicates the drum water is alkaline if the rise in pH is strictly from ammonia. Therefore, it is strongly recommended that before choosing AVT treatment, steps be taken to ensure the consistent purity of plant feedwater. Such steps may include use of a titaniumtubed condenser and/or full-flow condensate polishing. High pH in the feedwater from ammonia will cause ion exchange polishers in the system, including cation conductivity resin columns, to exhaust more quickly since non-ammoniated resin removes the feedwater ammonia.

Low-level phosphate treatment – A phosphate-pH control treatment program that usually operates with a range of phosphate between 2-6 ppm (mg/l). Once-through steam generating units (OTSGs) –The water is pumped into the unit as a subcooled liquid, passes over the heating surfaces, and is converted to steam as it absorbs the heat. There is no recirculation of the water within the unit and no conventional drum for the separation of water and steam. Water flows sequentially through the economizer, evaporator and superheater.

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