Ready via the warmth restoration Steam Generator Chemistry Limits job team and the Water know-how Subcommittee of the ASME study and expertise Committee on Water and Steam in Thermal platforms. This e-book is a vital spouse to formerly released files ready to notify and train the reader and to improve reliable chemistry keep an eye on and working practices for steam and water utilization in thermal platforms
Read Online or Download Consensus on Operating Practices for Control of Water and Steam Chemistry in Combined Cycle and Cogeneration Power Plants: From the Center for Researc PDF
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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
The mechanical carryover is a function of the drum design and condition of the steam/water separators, the operating pressure, the drum water level control, the steam header pressure stability, the steaming rate and the magnitude of sudden surges in the steaming rate. 6 MPa), according to American Boiler Manufacturers Association (ABMA) standards. Measured carryover is typically lower as long as the drum is operating at the design level and the separation equipment is working properly. The percent mechanical carryover from any drum that supplies steam to the turbine should be checked every six months by comparing the sodium in the drum water (grab sample) versus the sodium in the saturated steam (on-line analyzer).
Relationship between conductivity and steam purity is affected by too many variables to allow its reduction to a simple list of tabulated values. (4) Achievable steam purity depends on many variables, including Evaporator water total alkalinity and specific conductivity as well as design of steam drum internals and operating conditions [Note (3)]. 1 ppm (mg/l) TDS turbine steam purity must be addressed specifically. (5) As a general rule, the requirements for attemperation spray water quality are the same as those for steam purity.
Combustion turbine purge cycles that occur just prior to ignition exacerbate the situation by pushing cold air through the HRSG followed by the engine ignition and sudden temperature rise. These factors can produce condensate in superheaters that can result in thermal low-cycle fatigue. This result can be minimized with proper design and operational procedures. Start-up practice should ensure that oxygen is less than or equal to 10 ppb in the feedwater and any other water that will be fed to the HRSG before the deaerator is operational.