Gasification Daily Question: 11-18-2016 – Process analysis question (5 points for participation, 10 points for a correct answer)

1. Quality issues with coal slurry, resulting in sticking and blockages during pipeline transportation； 2. Problems with the slurry pump: sticking or blockage of the outlet and inlet valves, as well as issues with the pressure in the outlet buffer tank; these factors cause periodic resonance in the slurry pipeline, resulting in large fluctuations in slurry pressure ； 3. Regarding the issue with oxygen at the center, whether the valve head is damaged, resulting in intermittent fluctuations in flow rate.

1. Fluctuations in slurry concentration； 2. Unstable slurry viscosity ； 3. Coal slurry particle size issue ； 4. Wear of the burner slurry passage ； 5. Oxygen pressure fluctuations ； 6. System pressure fluctuations ； 7. Fluctuations in slag port pressure difference ； 8. Fluctuations in the outlet pressure of the coal slurry pump ； 9. Fault in the measuring instrument.

The channel is blocked, the instrument has a problem, and the oxygen flow rate is too high

1. Poor quality of coal slurry 2. Low opening degree of the oxygen flow control valve 3. Problems with the high-pressure coal slurry pump 4. Quality issues with the burner 5. Foreign objects in the coal slurry gap

My humble opinion: 1. There has been a sudden change in the quality of the coal slurry. 2. The flow rate of the coal slurry pump has changed. 3. There is a leak in the coal slurry pipeline. 4. Instrument measurement error. 5. The pressure in the gasification furnace changes. 6. Caused by changes in the burner channel.

As the concentration of the coal slurry increases, its viscosity also increases accordingly, leading to sticking and blockages during pipeline transportation； Problems with the slurry pump: sticking and blockage of the outlet and inlet valves, issues with the pressure in the outlet buffer tank, which lead to periodic resonance in the slurry pipeline, as well as significant fluctuations in slurry pressure ； Regarding the issue of central oxygen, practice has shown that the check valves for central oxygen need to be replaced regularly. It is possible that the valve heads have been damaged, resulting in fluctuations in flow rates from time to time. To date, it has been observed that in several cases the valve heads of the check valves in central oxygen pipelines have been damaged or lost without being detected in time, and accidents have already occurred in some manufacturers ； There may be wires in the coal slurry, and the check valve seal is worn out ； Burner wear ； When the inlet of the high-pressure coal slurry pump is blocked and there is no material flowing, the pressure difference at the burner drops rapidly, which is also very dangerous. If the inlet and outlet check valves get stuck, do not close properly, or do not open fully, it will affect the pressure difference in the burner. The pressure in the driving fluid section decreases, which reduces the effective power transmitted to the diaphragm; as a result, the energy obtained by the coal slurry from the diaphragm decreases, and the pressure difference across the burner also declines

1. Poor quality of coal slurry 2. The oxygen flow control valve is set too low 3. Problems with the high-pressure coal slurry pump system 4. Quality issues with the burner 5. Foreign objects in the coal slurry gap

Mismatched pressure in the outlet accumulator, low amount of hydraulic oil, poor performance of the horizontal bar, frequent fluctuations in system pressure, frequent load adjustments, severe wear of the burners over time, low load, inappropriate level of central oxygen