Troubleshooting for Ground Torch Systems
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Ground torch systems typically have multiple levels of venting; usually only one level is kept open at all times, while higher levels are activated automatically based on the venting pressure. So here comes the question: in order to ensure that the flare can be vented promptly in case of an emergency, can the flare venting mode be set to always on? If it cannot be kept on continuously, what is the reason? I’d like to ask the experts!
When an emergency occurs, the pressure in the torch venting pipeline rises; at this point, the normally open valve of the first stage is no longer sufficient to meet the requirements. Once the pressure reaches the level required by the second stage, the burner of that stage starts to burn, and so on. As the pressure in the venting pipeline system returns to normal, all burners except the primary one are gradually shut down in reverse order.
The normal emission levels are vastly different from those during emergencies – has the original poster considered the issue of flow rate?
Generally, the first stage is normally open, while pneumatic butterfly valves are installed on the other stages. Depending on the amount of air being released, the pressure in the vent pipeline is monitored, which helps determine how many stages of butterfly valves need to be opened sequentially. Once venting is complete, these valves close automatically stage by stage
The flare gas enters the first-stage combustion tube, and the pressure signal of the flare gas is transmitted to the control valve of the combustion tube via a pressure transmitter; when the set value is reached, the control valve gradually opens. By the same logic, it is the pressure of the flare gas that determines which combustion level should be activated. The second question isn’t very clear; I hope the original poster can clarify it.
The workload adjustment of the flare burner is achieved through a staged control system. The operation of the stage valves is controlled by a 3-to-2 pressure transmitter located on the flare main pipe. The flare control is divided into multiple stages as required; the first stage is always open, while the other stages use stage control valve assemblies to distribute the flare gas to one or more burners for combustion. The first stage is equipped with steam for smoke suppression.