Let’s discuss Shell’s furnace safety and combustion control

Furnace control can also be understood as temperature control within the furnace. If the carbon dioxide and methane analyzers are accurate, then control can be carried out by adjusting the steam generation rate in small increments. Moreover, when the system is stable, the temperature of the superheated steam can reflect the furnace temperature; even when the system experiences fluctuations, it can still quickly indicate the level of temperature in the system. Of course, this is assuming that 13TV--0044A/B does not operate at a certain setting. Stable temperature can be achieved through comprehensive control in combination with several other key temperature points

Could you explain in detail how information such as carbon dioxide and methane levels as well as steam temperature is used to determine the furnace temperature? :)

The control of furnace temperature you mentioned focuses more on the operation control and adjustment of the gasification furnace. What I mainly want to talk about here is the ignition and startup of the gasifier. On the same elevation, the shell is equipped with ignition (start-up) devices (slightly higher than the rest), coal burners, and observation ports at different angles. When starting a gasification furnace, it is first started by ignition (commencing operation), after which the temperature and pressure are increased, and then the coal burner is activated. The problem here is that there are only two viewing ports; even if flame detectors are installed later, it will still be possible to monitor only two coal burners. This does not quite meet the relevant safety standards. How can this be explained? After normal operation and a slag film forming on the membrane wall, can the flame detector still function properly? Last edited by Houses are too expensive on 2009-2-19 09:40]

Bro, you’re mistaken. The two flame shutdown ports are used to check whether the burner has ignited, as well as to monitor the condition after ignition, that is, the intensity of the flame. After the SUB is ignited, as the pressure throughout the system increases, the flame moves away from the intersection point of the two flame detectors, resulting in a decrease in the intensity of the flame detection. At this point, experienced operators need to pay attention to both the pressure in the vaporization furnace and the condition of the flame detectors. Of course, the higher the pressure, the better; however, it is necessary to maintain an adequate level of flame detection intensity. The coal burner should be inserted into the vaporization furnace only when both the pressure and the flame detection conditions are suitable. If the coal burner sends out a signal indicating ignition, then by observing the changes in water vapor temperature and pressure, it can be determined that the burner is functioning properly. Once the burner is ignited, the flame detection holes can no longer detect the flame (as it is covered by slag).

“After the SUB is ignited, as the pressure throughout the system increases, the flame moves away from the intersection point of the two flame detectors, resulting in a decrease in the detection signal. Is this caused by the constant pressure existing before the burner gun is started up? Last edited by Houses are too expensive on 2009-2-20 09:10]

“The function of the two viewing ports is to detect whether the start-up burner has ignited, as well as the condition after ignition, that is, the intensity of the flame; this indicates that these two viewing ports are used for flame detection during ignition and when the start-up burner is activated. “If the coal burner detection provides a combustion signal feedback, this also indicates that combustion was detected when coal powder was first introduced. If put that way, those two fire observation holes are actually two flame detection holes. One is for ignition flame detection, and the other is for coal flame detection. I’m not sure if my understanding is correct?