Fluctuations in make-up water to the waste heat boiler

There is a problem with the adjustment of the control parameters.

When the control valve is operated manually, the flow rate continues to fluctuate. The analysis approach is as follows: 1. First, it is necessary to determine whether the indication is accurate At the same time, check whether the boiler liquid level fluctuates slightly behind, to verify the accuracy of this flow rate display. 2. If all of the above conditions are true, then it is necessary to consider the fluctuations in the back pressure of the pump and boiler steam. 3. It is also necessary to check whether the boiler blowdown system is functioning properly. The above is for reference only; the actual situation on site shall prevail.

Check whether the on-site control valve is faulty. You can try changing to secondary control.

In the case of regular fluctuations, verify the accuracy of the liquid level data by using a glass plate; if the actual liquid level fluctuates significantly: 1. Check the operating status of the control valve – a manual mode does not necessarily mean that the control valve is not operating irregularly； 2. Monitor changes in the pressure of the steam system; for small boilers, this pressure is subject to fluctuations in the system, while large boilers exhibit greater stability ； 3. If temperature and pressure fluctuate significantly, the liquid level will also fluctuate greatly; of course, this possibility is very low ； 4. Verify whether the boiler load has reached or exceeded the design value; typically, the boiler manufacturer provides relevant data at the time of design ； 5. Analyze the quality of boiler water to rule out the possibility of steam-water azeotropy. 6. After investigating the final process and instrumentation issues, equipment problems were suspected. Personal opinion