Boiler water chemistry, kept by a machine
Boiler water with the wrong chemistry scales and corrodes the tubes. At PKS Tandun, four chemicals are now injected automatically based on sensor readings.
±0.1pH
dosing range held
The problem
The boiler is the heart of a palm oil mill. If the water chemistry drifts, the tubes scale up, then corrode. In the end the steam turbine stops off schedule.
Keeping it right takes the correct dose, all the time. That is a job for a machine.
What we did
- 01 · Field
Sensors and pumps
Inline sensors read the boiler water's pH, conductivity and hardness. Four dosing pumps, each on its own VFD: pH booster, oxygen scavenger, anti-scalant and water softener.
- 02 · Logic
Dose follows the reading
A PLC and touchscreen HMI set each pump's dose from the sensor readings. The data also goes to PTPN IV's central monitoring system.
The result
- Dosing held within ±0.1 pH.
- The dose of all four chemicals follows the sensor readings, not guesswork.