Effect of burner pressure difference on atomization
Thread Content
Discuss the impact of changes in burner pressure difference on the system in relation to the equipment in our plant, and please provide some data.
The burner pressure difference is generally due to prolonged use of the burner; changes in the gas composition can be observed, such as those in CO2 and CH4 – just look at the curves. . . . . . . .
Has the quality of the coal changed? . . . . . . .
The burner pressure difference is an important parameter that reflects the atomization efficiency of the coal slurry. If, over time, the gap around a burner becomes very large, the burner pressure difference decreases; as a result, the speed of the coal slurry exiting through this gap reduces, its kinetic energy falls, and the atomization quality deteriorates. In severe cases, large particles of coal slurry are formed, and these particles cannot react completely inside the gasifier. Some of the unreacted carbon is carried out of the gasifier along with the slag. Theoretically, since the carbon has not reacted completely, there is an excess of oxygen. In such situations, it is necessary to reduce the oxygen-to-coal ratio and increase the furnace temperature; this leads to an increase in carbon dioxide levels and a decrease in the amount of usable gas. This is just my personal understanding – I would appreciate any feedback!
What is burner pressure difference? How large is the range of fluctuations? What parameter changes do fluctuations bring about? What are the reasons for the changes?
The burner pressure difference is the difference between the slurry pressure and the gasifier pressure. Generally, the pressure difference is high at the beginning of use for burners; as the gap around the burner expands due to the scouring by the coal slurry, the pressure difference decreases. This results in a poorer atomization effect, an increased oxygen-to-coal ratio, and a rise in furnace temperature.
Here, when the quality of the coal is stable, the pressure difference at the moment the burner is put into use is generally between 0.4 and 0.45, while the carbon dioxide level is around 17-18%. Over time, this pressure difference decreases gradually; by the time it reaches 0.3-0.35, the carbon dioxide level rises to 18-20%. Under normal circumstances, this situation occurs after 60 days of using the burner, which is when it’s time to replace it
It seems that the pressure difference of our burners won’t change much even around February