After shutting down the TCS reduction reactor, vacuum pumping is used for evacuation instead of purge with compressed air
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RT, I wonder how many manufacturers are doing this these days? Is it effective? Is it much more cost-effective than traditional stamping replacement? How is the security?
Ugh, is no one discussing it? Is our company the first to do this?
More or less. I haven’t really heard of it being done that way; I just don’t know what the results are like in your case
It’s not a replacement; it’s a combined use of vacuuming along with nitrogen and hydrogen filling.
Reply to 4# zhangweicheng: I agree with your approach; well done
What I’ve seen is the use of both vacuum pumping and nitrogen flushing together, but vacuum pumping isn’t very effective; the vacuum equipment tends to get clogged
Reply to 4# zhangweicheng: Do it simultaneously? On our end, it should be N2 purging after H2 purging, or during operation. Use vacuuming instead. Do you mean that N2 purging is still required after freeing up time? It seems that many companies in China’s energy sector have already done this
Reply to 7# ymlgx: What kind of vacuum pump are they using? Is it blocked by broken polysilicon rods? Whether a vacuum pump is used or not, the feed pipe and exhaust pipe often get clogged.
That’s a good idea; I want to give it a try too, but I haven’t driven yet. . .
Many companies are using it. Don’t get complacent. However, as Zhang Weicheng said, such a combined permutation scheme is very good.
Many companies use it, and the sequence should be: stamping, pressure relief, vacuum pumping, and breaking the vacuum. I have two questions for everyone now. 1: Should the operation of the vacuum pump be integrated into the DCS system? Personally, I don’t think it’s necessary. As long as the program reaches this step, a prompt should appear. The vacuum pump is manually operated by the operator to evacuate the area, and once that is done, the DCS proceeds with the subsequent steps. Another method is to control the vacuum pump with a pressure switch. When the pressure meets the requirement, it is connected to a vacuum pump for evacuation; once a certain negative pressure is reached, the positive pressure system is automatically disconnected. In addition to the cost, this method also relies more on instruments. 2: Does the gas drawn out by the vacuum pump go into a system? Since the vacuum pump is used for starting and stopping, the gases drawn in include nitrogen, oxygen, hydrogen, TCS, etc. . Previously, two systems were used (atmospheric emissions and process emissions). Is there also 2 systems now? When parking, air is definitely drawn in to the process system. The key question is: does oxygen also enter the process system when driving? Is it safe?