Operation of the primary drain valve for the waste heat boiler header
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Our plant has an 18t/h waste heat boiler, and now there is a proposal to keep the primary drain valve of the header open at all times. Waste discharge is carried out through secondary doors. Are there any disadvantages? What are the hazards of leaving it running for a long time? Urgent! Urgent! Urgent!
It depends on whether it is regular blowdown or continuous blowdown of the boiler.
I’m not sure what the author means by primary valve and secondary valve Which one is in front, and which one is behind? . Generally, two drain valves are installed in series; the one located closer to the boiler remains open at all times, while the one further away serves the purpose of draining water. This arrangement is intended to facilitate replacement. There should be no harm
But have you ever thought that keeping the primary valve near the boiler fully open can cause the valve to rust shut? This prevents it from functioning as a one-way valve.
Normal primary and secondary doors should be fully closed. The operation of the primary and secondary valves is as follows: when draining, open the primary valve first, then gradually open the secondary valve. After drainage is complete, close the secondary valve first, and then close the primary valve. By following this procedure, there is no erosion caused by throttling when operating the valves, and the integrity of the drainage pipe is also maintained.