Reasons for the damage to the Start Up Burner of Shell furnaces
Thread Content
The main cause of SUB burnout is tempering due to various reasons; if conditions permit, one can observe this phenomenon and see the direction of the flame. During the SUB test, an imbalance in the oxygen-to-oil ratio can also lead to peroxide burnout; this is an exception. If the oxygen-to-oil ratio has been determined through experimentation, this kind of problem will not occur.
Upon close inspection of the damaged SUB, it seems that tempering may not be possible. Haha, some of the damages occur during the voltage increase process after ignition, and these are quite typical. Initially, they were related to poor manufacturing of the copper components and inadequate mixing design; later on, other causes might include failures to follow standard procedures during assembly or maintenance, such as issues with O-ring sealing, poor fit of the components, and insufficient flux. Nowadays, many devices use pre-installation testing outside the furnace to assess the quality of maintenance work – those that meet the specified parameters are installed, those with significant deviations are adjusted, and those that don’t meet the standards are rejected from use. This has significantly reduced the occurrences of incidents that disrupt the operation process due to SUB issues
There are many possible reasons for the burner tip to get damaged, with the main ones being as follows: 1. Poor diesel atomization, resulting in oil flowing down along the tip； 2. Imbalance in oxygen-to-oil ratio, with the interlock not activating in a timely manner ； 3. The operating time of the startup burner is too long ； 4. Diesel is dirtier, causing blockage and deviation at the burner tip ； 5. After coal was fed, the burner was not turned off in time after starting up ； 6. Insufficient cooling water flow to the burner or leakage.