I have two questions regarding special heating operations in coke oven control rooms…

1) When the gas pull rod suddenly breaks during direction change, the main gas valve must be closed immediately, and the entire furnace should be insulated. Then organize emergency repairs and determine the cause of the accident. 2) Check the switch’s PLC control system and electromagnetic directional valves; this situation is quite dangerous and should be avoided as much as possible

In the event that the gas pull rod breaks suddenly during direction change, the main gas valve must be closed immediately, and the entire furnace should be insulated. Then organize emergency repairs and determine the cause of the incident; the gas exchange process must not stop – turn off the power to the switch and handle it manually.

1. The continuous operation without interruption during the switching process (for gas) is due to the hydraulic travel switch. This situation occurs when it should be absorbing but fails to do so. Please have an electrician handle it. 2. Sudden breakage of the gas pull rod generally does not occur (unless there is inadequate maintenance of the equipment). If this occurs, don’t panic. The gas strut is different from the exhaust strut; it is not subject to any force when there is no direction change, so the strut does not pull to one side (use a winch to pull the disconnected part into place for welding). There is no need to stop heating unless there are special circumstances; if the processing time exceeds 1 hour, heating can be stopped. But it becomes very dangerous during the commutation process.

The breakage of the gas pull rod usually occurs at the start of switching; if it breaks while in a downward position, causing the gas not to be shut off, the adjustment valves should be closed immediately. If the main gas valve is turned off directly, attention should be paid to changes in gas pressure to prevent backfire explosions. If the gas supply is interrupted while it’s in an upward state, it’s not a serious problem; at most, there will be insufficient gas supply. If heating can be maintained, do not stop it – generally, the issue can be resolved within one switching period (30 minutes). If the processing time is long, close the addition and subtraction valves. During the switching process, the gas flow should not stop. If it is controlled by a PLC, the light should remain on during the switching phase; in such cases, check whether the settings of the time relay are correct, which can help rule out any issues with the intermediate limit switches. If the limit light does not turn on after switching to the intermediate position, it may be due to a faulty limit switch or an issue with the limit mechanism not being reached; replacing the limit switch or adjusting its position should resolve the problem.

[For the strip breakage, it is necessary to analyze the causes of this accident; first of all, is the exchange valve cleaned regularly? Is the gas stroke in the correct forward and reverse direction? Are there any itinerary markers? Furthermore, if the switch experiences these two issues, I believe there are serious problems with the PLC system settings or the operating parameters of the switch; it is necessary to contact the manufacturer immediately for prompt resolution!