Time when the nitrogen plug of the oxygen tube is opened

The N1 pressure is over 100 kilograms; if it rushes into the oxygen pipeline, will that be good for the other operating furnaces?

It must be effectively isolated from other systems; the nitrogen blown into the oxygen tube pushes the oxygen in that tube into the vaporization furnace. Nitrogen has no effect on the system, but there is a concern that if the first oxygen cut-off valve leaks, oxygen could enter the furnace directly, leading to a peroxide explosion.

Hehe, I’ve noticed the OP’s question. If you take a closer look at the interlocking actions of the valves during parking, you will see that the second oxygen cut-off valve remains under the protection of high-pressure nitrogen purging from the time it is opened until it is closed; as a result, oxygen cannot get in, and there is no need for nitrogen sealing during this period. Once the high-pressure nitrogen purging is complete and the second oxygen shut-off valve is closed, the high-pressure nitrogen seal valve opens, isolating the oxygen system from the gasifier.

We have two oxygen cut-off valves and two slurry cut-off valves; the seal valves also close at the same time

Is there a problem with the program settings? The delay time for the operation of the oxygen valve and the nitrogen plug valve is set to be too long; it generally does not exceed 2 seconds. If, after parking, the first shut-off valve (upstream) closes and there is a leak in this valve, it can be quite dangerous. It is recommended to reconsider or discuss it with the patent holder.

Generally, after parking, the first oxygen valve and the second oxygen valve are closed simultaneously; the purge valve for the oxygen pipeline N1 is opened for 25 seconds of purging. For the coal drop pipeline, purging takes place after a 7-second delay for 10 seconds. I’ve never seen such a setup before! Besides, is it really necessary to set it up this way? After parking, the two shut-off valves should be closed immediately, while the oxygen pipe and nitrogen plug valves should open after a 30-second delay. What you wrote is contradictory from the start! Secondly, the second oxygen cut-off valve shuts off after a 15-second delay; this doesn’t serve any useful purpose and instead has a negative effect. I suspect there are two reasons for this: first, you didn’t read the interlock diagram carefully enough ； Second, there is a problem with your interlocking settings! These are the original words of the poster: (The control center confirms that the following parking procedures are correct: the second oxygen cut-off valve closes after a 15-second delay, while the nitrogen plug valve for the oxygen pipeline opens after a 30-second delay. Why isn’t the nitrogen plug valve opened first, followed by the second oxygen cut-off valve?) ) It’s just my personal opinion; feel free to learn from each other!*

No matter how high the pressure of nitrogen is compared to that of oxygen, it will not cause oxygen to leak, unless there is a problem with the valves. Furthermore, when the pressure of nitrogen is low, it will trigger the closure of the nitrogen valves

The operation of closing the first oxygen cut-off valve should occur simultaneously with the operation of opening the nitrogen seal valve, after which the second oxygen cut-off valve closes after a 15-second delay. There must be something wrong with the original poster’s settings.

After the vehicle comes to a stop, both the first oxygen cut-off valve and the second cut-off valve close simultaneously. At the same time, the nitrogen purge valve purges the oxygen and slurry pipelines (oxygen is purged first, followed by the slurry). The purging of the oxygen pipeline stops after 25 seconds; during these 25 seconds, no oxygen can enter the gasification furnace. The nitrogen plug valve opens 30 seconds after the oxygen cut-off valve closes. As a result, there is a period of 5 seconds with no nitrogen cut-off, and this 5-second period includes the time it takes for the nitrogen purge valve to close and for the nitrogen plug valve to open – so there should be no risk! !