Why is it difficult to keep a perpetual light burning?
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During furnace heating, natural gas is used in place of gas; the pressure at the plant is 0.25 MPa, and the gas enters the furnace via a bypass line that passes over the gas separator tank. It has been one day maintaining 150°C, and during that time the eternal flame could burn on its own. We are now preparing to increase the combustion from the burners. To control the rate of temperature rise, we originally planned to keep some burners running at a low level, but they wouldn’t ignite, so we need to use the main burners to maintain combustion. Adjusting the air supply or opening the permanent light valve does not help to start it burning. Why?
Similar incidents have also occurred in our factory during furnace drying, involving the use of burners to maintain the required constant temperature. The main reasons for this may be as follows: 1. There are issues with the operators’ techniques, as the adjustment of the \"three doors and one panel\" system is not proper. 2. The free water in the furnace walls evaporates rapidly at around 150°C, resulting in unstable negative pressure inside the furnace.
How about a negative pressure of 30 Pa? What is the typical negative pressure level maintained during this period?
Check the pressure of the secondary air supply; at the same time, analyze whether the gas composition of the source gas meets the requirements for ignition.
Hehe, the reason was found when lighting the burner today. By default, after the furnace is installed, the air supply for each burner is turned on; as a result, each burner continues to receive air regardless of whether it is in use or not, which leads to higher airflow around those burners. During the process of adding more perpetual flame burners this day, we made sure to close the air supply valves for the surrounding burners as well as those on the burners themselves. We also fine-tuned the air supply caps on the perpetual flame burners themselves, in order to stabilize and slow down the airflow over those burners as quickly as possible. In this way, the eternal light can burn properly without going out.
Congratulations to the original poster for taking another step forward – the main reason a fire won’t catch is usually that the wind isn’t adjusted properly. I gained more experience over time.
I encountered it once, due to excessive negative pressure
The situation is quite complex – it involves air distribution, burners, and ignition systems, with the goal of maintaining the desired constant temperature at all times.