Flow nozzle – differential pressure transmitter – DCS compensation; Medium: superheated steam; Main steam flow Design conditions: 9.8 MPa, 540 degrees Celsius, flow rate of 220 T 0-250KPa corresponds to 0-270T operation of the high-pressure furnace

Flow nozzle – differential pressure transmitter – DCS compensation. Medium: superheated steam. Main steam flow. Design conditions: 9.8 MPa, 540 degrees Celsius; flow rate of 220 T. A pressure range of 0–250 KPa corresponds to a temperature range of 0–270 degrees Celsius. The boiler operates in high-pressure mode (a natural gas boiler converted from a coal-fired boiler). Actual conditions: 3.5 MPa, 400 degrees Celsius; flow rate of 170 T. The boiler operates in medium-pressure mode. It was found during actual operation that the boiler’s combustion efficiency increased from 92% as designed to 95%, suggesting that the measured values might be on the high side The meters have been checked; their zero points and ranges are all normal, and the pipeline drainage is functioning properly. I would like to ask regarding this situation: 1. Is the high measurement value caused by conditions other than those for which the system was designed? 2. How is the error calculated? Thank you, I need help!

Whether the straight pipe sections before and after the nozzle installation meet the requirements, as well as temperature and pressure compensation, all of these factors can cause deviations in the calculations carried out in the DCS

Both the installation and DCS configuration were carried out by the manufacturer, so I think there should be no problems

I also think it’s caused by the current operating condition of the boiler being different from the conditions specified in its original design

It’s normal for the manufacturer’s algorithm to be imprecise. To find out how large the error is, one can only use other flowmeters for comparison; the problem is that even those other flowmeters cannot guarantee complete accuracy. If possible, it would be advisable to try to calculate the water consumption accurately.

Can I say your demands are really high? How much higher can process control go? Think more about what process control means. My ideas might not be perfect; they’re a bit rough, but I think they’re okay! :lol