Reason for closing the front valve of the heating furnace after interlock activation

The question isn’t detailed enough! Does the heating furnace’s gas system have an automatic shut-off function?

This post was last edited by liuquan1100 on 2017-5-8 at 20:57. It is necessary to determine first why this happens in a chain-like manner~~~ After ruling out faults, most people tend to close the main fuel gas control valve and then reset the shut-off valve, using a pilot light to ignite the main flame; theoretically, the flames should be lit one by one.

The interlock self-protection valve has been turned off; the first step is to identify the cause, reset the interlock, and resume production! Close the manual valve unless a emergency shutdown is required! Prevent internal leakage in the self-protecting valve!

The heating furnace stopped automatically due to interlock; the gas UV cut-off valve has also been closed automatically as a result of the interlock. Should I go do something else at this time, and wait until I have some free time to close the valve in front of the furnace? Should the furnace front valve be closed right away, as soon as possible? What safety hazards could arise if those dozens, hundreds, or even thousands of furnace front valves are not closed immediately?

After preventing misoperations, it prevents accidents such as gas-induced poisoning and suffocation or flash explosions.

After the interlock is reset, it is possible that the fuel gas pressure control valve has not been fully closed, allowing a large amount of fuel gas to enter the furnace suddenly; insufficient oxygen levels can then lead to secondary combustion or a flash explosion. Therefore, the front valve of the furnace must be closed.

There are two purposes for performing this: 1. To prevent internal leakage in the shut-off valves and control valves, which could lead to flash explosions in the furnace! 2. When the unit resumes operation, it is necessary to first perform interlock reset; after opening the shut-off valve, the burners should be ignited one by one according to the temperature requirements! Is the safety switch definitely turned off before lighting?……

There are two purposes for performing this = There are two reasons for doing this! :The issue that P is worried about has arisen; when carrying out the operations, you can simply rule out the possibilities of such issues and proceed based on experience... But unless it’s urgent, it’s better not to use this method!

One scenario is that if the manual valve is not closed or is forgotten, once the interlock system is reactivated, fuel gas will enter the furnace, resulting in an accident. Another possibility is that the accident valve has been activated as a result of a chain reaction, but something is stuck inside it, preventing the valve from closing completely; as a result, the burner will continue to burn, and there could be problems with the furnace tubes. In reality, these situations have been encountered: the first is a flash explosion in the furnace chamber, which causes the explosion-proof doors to be blown open; the second is overheating due to coking in the furnace tubes. If there is no time to shut off the individual manual valves of each burner in an emergency response, the main valve for each circuit can be turned off, and the individual valves can be handled later when time permits.

It is important to first determine the reason for the interlock~~~ If the furnace has already stopped operating, and the interlock was triggered due to reasons other than leaks in the furnace tubes or other components, it should be allowed to continue operating for a while so that it can cool down and avoid coking!