Petersburg Air conditioning Tower Auxiliary Power Consumption with VFD's/ Control Approach Michael J Smith – IPL Executive & Project Management Abstract--The temperature control strategy for the cooling tower fans consists of two automatic modes of operation along with provisions to get manual operation. Both methods will provide sequencing for starting/stopping each of the 14-250hp, 480vac enthusiasts that have been made available for automated control. Additional power savings on the 3MVA, 4160vac tower system load may be between zero. 5 – 1 . 0MVA 6 months 12 months in the Midwest with the varying frequency hard disks (VFD's). The first, programmed mode, TEMPERATURE RATE, will probably be aimed at functioning the followers at or perhaps near the circulating water temperature resulting in the optimal product heat charge for the given weight. The goal of the second mode, AUX POWER, is to minimize the auxiliary electric power consumption simply by operating by or near to the highest back pressure possible without reaching several. 0 inHgA. This setting is only suitable for use during normal operation at full/ partial weight, and not during start-up/shutdown. During both modes, the minimum circulating temperature of the water will not be allowed to go under 70o N at low ambient temps to prevent tower system cell icing. Each enthusiast may be managed manually in either sidestep or through the VFD via the DCS or perhaps locally at the MCC. When all supporters in AUTO have been jogging continuously at 1 00% speed intended for 15 minutes in either automatic control mode, a sequential transfer to BYPASS shall begin using fan hysteresis. In WARMTH RATE function, if none of the followers in CAR are running, the first fan in the series shall be started and held at 25% minimum velocity. The remaining offered fans shall be sequentially began until all are at 25%. The speed arranged point shall then be raised to 100% for a lot of fans. Once AUX ELECTRICITY mode is selected, the DCS PID will receive HP hot very well temperature as the input. The set stage shall be the saturation temperature corresponding to six. 25 in HgA (3. 07 psi), with a deceased band corresponding to +/- 0. 50 in HgA. The speed in VEHICLE shall be stored the same, with sequential supporter starting/stopping because required, just like the operation during low normal temperatures.
Index Terms—Cooling, Tower, Fondre, Pressure.
PETE Unit a few consists of a coal fired single reheat steam generator supplying steam to a condensing turbine-generator with functioning conditions of 2, 400 psig, 1000/1000°F, and a score of six-hundred MW. The condenser is usually cooled by a 14 cell mechanical draft cooling tower. In 2006 this kind of cooling tower had reached the end of its beneficial life and was replaced with a just like cooling tower system. The enthusiast controls ahead of replacement were restricted to across the series starting and simple control logic. The alternative tower was equipped with 18 – two hundred fifty hp, VFD fans, and a more enhance control system . PETE Product 4 can be described as similar six hundred MW creating unit which has a 13 cellular mechanical draft cooling tower. In 2011 this Unit 4 cooling structure was replaced and equipped with 13 – 250 hp, VFD fans. The advanced control system operating upon Unit several was transmitted, refined after which installed on the device 4 substitute tower. The Control System Description in Section 2 and the Job Benefits in Section III are based on the system 4 unit installation. The Unit a few Cooling Structure utilizes an identical control strategy and encounter similar benefits to Product 4. Control System Description
General System Description
The physical equipment will contain (13) 250HP fans controlled by A-B PowerFlex 700H VFDs. Every single fan will likely have a bypass contactor for across-the-line operation. The fans happen to be fed via (4) A-B MCCs. Every MCC contains a primary and alternate feeder breaker situated in a (1) of (2) 480V electric power panels. The status with the feeder breakers will be constantly monitored by the control system. The feeder breakers may be remotely opened or closed from the control system. The control program will also monitor and control (3) existing MOVs controlling the...
References: Technical Papers:
M. Oldham, Grayscale Veatch (May 4, 2005), " Chilling Tower Overall performance Specification Recommendations”
Grayscale Veatch (October 14, 2005), " Indiana Power and Light- Petersburg Unit 3- Cooling Tower- Programmable Common sense Controller- 140863. 64. 3600- General Specifications”
Black and Veatch (March 15, 2006), " IPL Petersburg Unit 3- Cooling Tower Fan Analog Control- BACTERIAL VAGINOSIS Project 140863”
C. Barron, M. Wildeman, B. Horstman, Project Acquaintances Inc. (December 20, 2010), " IPL Petersburg Producing Station- System Description Document- Unit four Cooling Tower Control”
Cooling down Tower Check Associates, Incorporation (March 21 years old, 2012), " Summary of Test Results- Indianapolis Electrical power & Light- Unit 5 in Petersburg, IN- Cold weather Acceptance Evaluation on the SPX Cooling Solutions 13 Cellular, Mechanical Draft, Cross-Flow Cooling down Tower”
Jordan J. Jones IPL (May 31, 2013) " U4 Cooling Tower system Economic Analysis”
Microsoft Excel 2010 Financial Spreadsheet Functions
Author, Bios and photos
Michael jordan J. Jones is the Product Manager, Executive and Job Management to get the Power Supply Division of Indiana Power & Light Co, Inc. He holds a BSEE through the University of Evansville in Evansville, IN, is authorized as a 6 Sigma Black Belt, and is currently pursuing an MASTER OF BUSINESS ADMINISTATION to be finished November 2013. Smith earlier known as worked in automation consulting, heavy market, and making with Amax, ALCOA, Whirlpool, and Hershey before joining the power sector in 2006.