The “CHEM-FEED” Dual Peristaltic Pump Engineered Skid System manufactured by Blue-White Industries.  The skid consists of two “Flex-Pro” A3 peristaltic pumps, a calibration cylinder and Plast-O–Matic components, (e.g., eight True Blue manual ball valves, two diaphragm check valves, a gauge with gauge guard, and a relief valve.)  Skid Model Number:  CFS-2AA-AAAXBA.  Pump Model Number:  A3V24-MNJ.

 

LOCATION:     Southern Company’s Stanton Energy Center located in Orlando, FL.  Stanton Unit A is a natural gas-fueled, combined-cycle electric-generating unit with a capacity to generate 656 megawatts.  The combined-cycle plant includes two natural gas-fired combustion turbines, two heat-recovery steam generators and a steam turbine.

 

APPLICATION:     Injecting 12.5% Sodium Hypochlorite (250 – 300 GPD) into the reuse water to prevent biological build-up within the water tubes of the condenser.   Any buildup within the condenser would greatly reduce the efficiency to produce steam, hence less mechanical power.   In a condensing turbine, the thermal energy of steam is converted into mechanical power, which is converted into electric power by a generator.

 

PREVIOUS METHOD:    Southern Power elected to implement the changeover from Chlorine gas to Sodium Hypochlorite due to cost reducing measures.  Maintaining the liquid gas on site required the full- time support of an Emergency Management Team.  Eliminating the EMT would reduce operating expenses.

 

REASON FOR SELECTING THE PERISTALTIC PUMP TECHNOLOGY:    The peristaltic pump has proven to be far superior to that of any diaphragm pump when injecting gaseous chemicals against moderate to low pressures.  The peristaltic pump maintains a smooth, constant flow rate while eliminating the potential for a vapor lock.  The diaphragm pump is adversely effected by off gassing, hence the potential to lose prime.  However, the peristaltic pump technology allows any excess gas build-up to be pumped through the tubing while maintaining a highly accurate and continual flow.

 

REASON FOR SELECTING THE “CHEM-FEED” ENGINEERED SKID SYSTEM:    The “Chem-Feed” Skid System is a quality engineered; compact, efficient design, incorporating a high quality, proven “Flex-Pro” peristaltic pump and Plast-O-Matic components that will maintain the integrity of the skid system’s performance.   The skid encompasses a full chemical feed design that is less expensive and easy to install as opposed to purchasing the components separately and using an in-house engineering team to design and assemble.  In addition, the dual pump “Chem-Feed” model offered an excellent option to an emergency back-up in case down time was required on the primary pump.   Lastly, the local chemical feed skid manufacturers proposed out- dated technology of a diaphragm pump based skid system as well as using components that were far less inferior to the Plast–O-Matic components used with the “Chem–Feed” System.

 

RESULTS:    Southern Power is extremely pleased with the “Chem–Feed” performance since it has been installed in September 2010.  The ease of installation of a UPS delivered chemical feed skid system was a remarkable feature, far exceeding their expectations.  The “Chem–Feed” Skid System comprised of the A3 peristaltic pumps should expect to see a minimum of 7000 – 7500 hours of tube life based on previous applications with similar chemicals and pressure ranges of less the 20 PSI.