Airflow Measurement & Management Systems

How accurately are you measuring airflow? Through testing and calibration on many boilers, we have found the airflow to not be accurately measured or reliable. It is necessary to accurately measure and control the airflow in order to optimize combustion.

  • Improved unit and pulverizer controllability by improving the “K” factor accuracy and repeatability

  • Smoother differential signal

  • Capability to improve DCS logic and control curves so that an optimum airflow can be achieved across the normal operating load range

STORM® has vast experience in the design, fabrication, and calibration of many different types of airflow measurement devices. We frequently find that plants are unaware of poor airflow management and control. An essential first step to good air management is the metering and proper distribution of the air. 

Depending on the location in the ductwork, venturis or flow nozzles are preferred for airflow measurment. In most cases ductwork is rectangular, but when possible a circular venturi is preferred for the smoothest signal and maximum pressure recovery.

Averaging pitot tubes are economical, functional, and can be accurate–depending on the flow conditions. However, with averaging pitot tubes, we have found laminar flow to be the key to repeatable and accurate tube measurements. This can be accomplished by careful flow straightening and increasing the velocity in the averaging pitot tube measurement plane. The setup should be accurately calibrated by a multi-point hand traverse and checked periodically to ensure proper quantification and control of primary and secondary air distribution.

Air flow measurement
Typical Venturi & Connection Overview