On the control of process parameters and operation of waste heat boilers
Thread Content
This post is intended to facilitate in-depth discussions on the control of process parameters and operation of waste heat boilers, with the goal of ensuring safe and stable operation while meeting production requirements, thereby extending the service life of these boilers. The discussion covers the following three points: 1. What parameters should be controlled in waste heat boilers? How to control them? What are the metrics analyzed for operation, and how often is the analysis conducted? 2. What operational abnormalities have occurred in the waste heat boiler during operation? How to handle it? For example, in our plant’s waste heat boiler room, the pH value of the exhaust stream was sometimes about 6.0 lower than that of the inlet stream; yet the exhaust stream’s pH value remained above 9.0, which is within the acceptable range. In such cases, we raise the pH value by increasing the amount of chemicals used. As for the reasons behind this phenomenon, I’d like to invite everyone to discuss it 3. What measures have been taken to protect or ensure the safe, stable, and long-term operation of waste heat boilers? Things like technical upgrades, as well as other types of monitoring beyond the standard process parameters. I hope everyone will conduct in-depth discussions from these three aspects. I am willing to offer a generous reward! ! !
I believe it is necessary to mainly control parameters such as the pH value, conductivity, silica, and iron ions of the boiler feed water, with analyses conducted once a week
For example, if the safety valve has not reached its setting pressure, it will activate； Debris such as wire and welding slag is stuck inside the safety valve
How is that junk stove of yours performing?
In our workshop, we mainly monitor PH, conductivity, and total phosphorus. The analysis is carried out every three days for the boiler water. Control is generally achieved by regulating the amount of trisodium phosphate and sodium hydroxide added. During long-term operation, it is important to maintain proper pressure and temperature in the boiler; overpressure operation is strictly prohibited, and changes in pressure in the boiler should not be too rapid
It would be best to provide the control indicators and the basis for them
1. The quality of the softened water must meet the standards for boiler water (hardness, total phosphorus, pH, conductivity)； 2. The operation must be stable, avoiding large fluctuations to reduce the frequency of starting and stopping ； 3. Regular inspection and maintenance of the equipment must be ensured. The above three points are the foundation for maintaining the stable operation of waste heat boilers over the long term.
1. The normal analysis parameters for waste heat boilers include pH, conductivity, and calcium and magnesium ions; if phosphates are added, a analysis of phosphate ions is also required； It is recommended to conduct the analysis once per shift. 2. The locations for intermittent and continuous discharge in the waste heat boiler are different; as a result, the composition of the water discharged also varies