Reasons for fluctuations in slurry flow meter readings
Thread Content
Poor quality of the coal slurry causes fluctuations in the coal slurry flow meter; the causes are mainly sought in terms of the slurry’s concentration, viscosity, temperature, and particle size. How do these four factors affect the slurry flow meter?
This generally has no impact; if the quality of the coal slurry is too poor, the coal slurry pump will not be able to handle it in the first place
This issue is quite complex, but the factors mentioned by the original poster are not the main ones. Taking Kaifeng as an example, pipe diameter, the feedback settings of flow meters, and minerals in coal are the main factors
It’s better to increase the damping coefficient a bit
Reply to 4# 01ryxu: Adjusting the damping coefficient is not the fundamental solution
Electromagnetic flowmeters are highly sensitive to the electrolytes in coal slurry; therefore, stable coal quality is essential, as fluctuations in the coal slurry concentration can also lead to errors in flow measurement
The control of the slurry pump must be stable, with minimal pressure fluctuations
To identify the causes of fluctuations in the coal slurry flow meter, consider the following aspects: 1. Whether the pressure at the outlet of the coal slurry pump is stable, and whether the buffer tank at the pump outlet is functioning properly – this is a crucial factor. 2. Is the viscosity of the coal slurry deviating too much from the specified value? It is generally 900–1200 MPa·s. 3. Ensure that no foreign materials such as wires enter the mill along with the raw coal; otherwise, iron particles in the coal slurry may adhere to the electromagnetic flow meter used for measuring it, affecting the accuracy of the measurements. 4. The damping coefficient of the electromagnetic flowmeter is adjusted too low, resulting in the meter being overly sensitive. 5. The coal slurry pipeline is poorly secured, resulting in significant vibration of the pipeline. 6. Make a comprehensive assessment to determine whether there are any changes due to wear in the burner gaps. 7. Issues with the installation location of the electromagnetic flowmeter or problems with its quality itself. The concentration, temperature, and particle size of the coal slurry generally do not cause long-term fluctuations in the coal slurry flow meter