Ash content in coal exceeds standard
Thread Content
What to do when it is found that the ash content in coal exceeds the standard (some people say to increase the amount of quenching water while raising the temperature to improve the slag breaking ability). I don’t know what you think.
Increase oxygen-to-coal ratio and enhance conversion rate
Analyze the ash melting point. If the coal type is switched online, the coal storage bin should be emptied as much as possible, and the load should be reduced at the same time. Judge the time for the new coal type to arrive at the burner, monitor the furnace temperature, and adjust the oxygen-coal ratio in time according to the parameters. Due to the increase in slag content, the quenching water volume should be adjusted or the water temperature should be lowered.
As long as the ash melting point does not change significantly, there should be no major impact on the operation. The main thing is to ensure smooth slag discharge.
At this time, the furnace temperature should become higher, and I personally think that the oxygen should be appropriately reduced. But some people upstairs think that oxygen should be reduced, and some think that oxygen should be added. I hope everyone will actively speak up and discuss this issue! In addition, regarding the issue of increasing the amount of quenching water, some companies supply extremely cold water at full capacity during normal production, which means that it is already at the maximum amount under normal circumstances and cannot be added. Personally, I think the slag discharge from the lock bucket can be operated manually and the slag discharge time interval should be shorter.
For every 1% increase in ash content, oxygen consumption increases by about 0.8%. Therefore, when ash increases, oxygen must increase. Otherwise, the carbon conversion rate will decrease.； In addition, the slag discharge time and frequency of the lock bucket and the size of the flushing water must be adjusted.
As the ash content increases, the oxygen will increase accordingly, the system water temperature will become higher, and the operation of the entire system must be adjusted accordingly. Therefore, to ensure the stable operation of the entire system, it is necessary to consider whether the slag can be smoothly and timely removed, and whether the amount of slag will affect the operation of the slag scooper. Whether the system process indicators have changed too much, so coal type adjustment and load reduction must be considered