How to install flame monitoring and flame-out protection systems in gas-fired heaters and heat transfer oil heaters?

This post was last edited by longniu on 2020-12-8 at 14:36. The requirements for burner control in GB/T 19839, General Technical Conditions for Industrial Fuel and Gas Burners, specify that the burner should start automatically through the following sequence: starting the blower – pre-purge – electronic ignition – flame establishment – main flame formation – load adjustment – extinguishing of the main flame – post-purge – shutdown. The step of flame establishment requires that the burner be equipped with flame detection equipment, while post-purge refers to the flame-out protection mechanism! Flame detectors should be installed on the burner. Shut-down protection: close the gas valve assembly, detect leaks, and then purge until shutdown

The control of burners should be implemented in this manner; the same approach should be adopted for integrated burners or heating furnaces/boilers with a single burner. However, for systems with multiple burners, no corresponding regulatory provisions exist after checking. I have also been puzzled by this issue – for example, as regards multi-burner box-type furnaces used in natural gas hydrogen production facilities, it is not clear how they should be configured and controlled, and no relevant regulations can be found at present. Since the experts recommended that action be taken, for heating furnaces with multiple burners, the ignition control method used for single burners was adopted. In my understanding, it is not necessary for multiple burners to cause the entire furnace to shut down once one of them stops working. Regarding safety, my understanding is that the ignition phase presents the greatest risks; once operation is normal, the temperature inside the furnace becomes very high, and the fuel that enters will naturally catch fire and burn. I’m not sure if it’s correct; after all, experts take things into more comprehensive consideration.

For multiple burners, the requirements of the main process are of utmost importance; if one burner fails, it will no longer be possible to meet the process requirements and the plant must be shut down. It is appropriate to install safety control valves on the main fuel gas pipeline. If the shutdown of one burner does not affect production, then each burner needs to be equipped with a safety control valve. Safety control is a form of sequential control: unless the previous step is completed, the next step remains in a waiting state, unless there is an mechanism to break out of this sequential flow. For beginners, a book titled \"Natural Gas Burners and Application Technologies\" might be useful; it’s available online.

If there is a constant-lit lamp, could it be considered that no flame-out protection is necessary?

A perpetual light should be considered a form of flame-out protection

Our company specializes in flame detectors and flameout protection systems. Feel free to contact me at 13641393557 – Qiu Yingna, Beijing Yuan Dong

As soon as the Ministry of Emergency Management issued this notice, all manufacturing enterprises began to implement it, and fire detection equipment became in short supply. Can this be seen as a way to boost domestic demand?

Typical burners are equipped with a pilot burner/electrode and a flame detector. There are two ways to initiate ignition: using the pilot burner and ignition electrode directly. Flame detectors generally come in UV and ionization types. If the flame goes out, the detector sends a signal to the BCU or controller, which then closes the gas valve； Purge, manual/automatic reset, reignition