Power generation - coal pulverizer primary air measurement & control Application Brochure

The Kurz K-Bar 2000B Multi-Point Insertion Mass Flow Meter system provides accurate, repeat-able & reliable measure-ments of primary air used to properly dry and convey the pulverized coal to the burnersPOWER GENERATION COAL PULVERIZER PRIMARY AIRcomplex technology MADE SIMPLEA P P L I C A T I O N N O T E Power Generation Combustion Air Measurements The need for accurate, repeatable & reliable combustion air measurements in power generation plants is critical to effi cient operation and safety throughout the entire facility and processes. Coal-fi red power plant applications pose a number of challenges to obtaining these critical fl ow measurements includ-ing large ducts, limited metering runs, poor velocity and temperature profi les, high vibration, temperatures up to 750° F and dirty “Fly Ash” laden air. Customer Application and Performance IssuesA Midwest Coal Fired Power Plant operated a 175 MW Wall-Fired Boiler and used Pitot Tube/Dp technology to measure & control the Primary Air into the Bowl Mill Pulverizer. This traditional measurement technology resulted in: • Unreliable and non-repeatable Dp/Air Flow measurements• Very Low/Unstable Dp measurement (.03” WC) at low fi re conditions• Regular Maintenance/Cleaning of the Pitot Tubes• Pinching off of the Mill Classifi ers to meet desired coal fi neness• Mill “Puffs” which started out as non-destructive and got worse result-ing in $1,000,000 damage to the BurnersThe Kurz SolutionIn this application, the key to developing a stable, reliable and maintenance-free measurement system was achieved with the installation of a Kurz K-Bar 2000B Multi-Point Insertion Mass Flow Measurement System on the Hot and Cold Primary Air Ducts.The Hot Air Ducts had (3) Multi-Point K-Bar 2000B Probes and the Cold Air Duct had (2) K-Bar 2000B Velocity Probes installed. The (9) Velocity Sensors in the Hot Air Duct and (6) Velocity Sensors in the Cold Air Duct were equally spaced to provide an average velocity across the fl ow area. Performance Results with the Kurz SolutionAs a result of the Kurz K-Bar 2000B Multi-Point Velocity Sensor System, the plant was able to:• Achieve a Reliable & Repeatable fl ow measurement system.• Improve measurement Turndown, Accuracy and confi dence in the air fl ow measurements• Eliminate maintenance time needed to clean the Pitot Tubes/Dp im-pulse lines.• Lower the Primary Air Flow and Increase the opening of the Classifi ers for better pulverized coal fi neness control• Eliminate the risk of “Mill Puffs” by running at proper Fuel/Air RatiosBenefi ts of the Kurz Solution• Easy Installation • Extremely Low Mainte-nance even Under Harsh Conditions • Rugged and Accurate Dual Sting Sensors • High Repeatability• Accurate and Reliable readings in Low Velocity High Turndown Situations • Process Temperatures up to 500°CPower Generation: Coal Pulverizer Primary Air Measurement & ControlPAGE 2 DCN 364032 Copyright © 2009 Kurz Instruments Inc.Kurz Velocity Sensor Technology The Kurz K-Bar 2000B contains Fast Dual Metal Clad™ mass fl ow sensors that use reference grade platinum RTD’s with 0.25% repeatability. This coupled with the extremely high signal-to-noise ratio of the constant temperature electronic circuitry produces the most repeatable fl ow signal available in the industry. Our rugged and reliable FD “Dual Sting” fl ow sensor has repeatedly proven to work with little maintenance in “very dirty and hot” Combustion Air and Stack fl ow applications. And unlike many other devices will not plug or jam and can operate in low velocity high turndown applications while provid-ing stable, reliable and repeatable velocity/fl ow measurements. About Kurz InstrumentsKurz Instruments has maintained a reputation for designing and manufactur-ing Thermal Mass Flow Transmitters for industrial air and gas fl ow applica-tions. Our engineers, product development specialists and management staff have developed products to operate in the harshest of environments. For more than 30 years, our entire team has provided solutions to our customers most demanding and diffi cult applications. Kurz products are used in a wide variety of industrial applications includ-ing combustion air, aeration air fl ow and digester gas, nuclear power plants, pump protection, fl are stack monitoring and compressed air, to name only a few.Kurz headquarters is located in Monterey, California, and in addition, Kurz of-fers advanced services through Kurz Technical Services based in Tennessee.Kurz Instruments, Inc.2411 Garden RoadMonterey, CA 93940 800-424-7356 Toll Free Phone831-646-5911 Local Phone831-646-8901 Faxsales@KurzInstruments.comwww.KurzInstruments.comPAGE 3 DCN 364032 Copyright © 2009 Kurz Instruments Inc. This photo shows the typical fl y ash buildup on the downstream side of the K-Bar 2000B Sensor Support Tube.This photo shows the Velocity Sensor Window and Sensor Ele-ment remains clean and free of ash buildup. Thereby, Sensor/System performance is main-tained and downtime for mainte-nance is virtually eliminated.