Question: Issues with steam drums
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Our unit has several steam collection drums with a pressure of 0.08 MPa, and they now need to be inspected and accepted. Since it does not fall under the category of pressure vessels in terms of pressure, are there any mandatory regulations regarding its acceptance? Equipment that is processed by oneself. Connected to the jacket of the gas generator.
Acceptance can be carried out in reference to GB150-98.
Did you also fabricate your jacket by yourself? Now, many gas generator manufacturers lower the saturated steam pressure in order to avoid pressure vessel issues and reduce costs. In my opinion, there is no problem using such low pressure; the conventional leak-testing methods used in mechanical processing will suffice, and the processing unit must have the appropriate qualifications. However, safety valves and pressure gauges must still be installed, and they need to be calibrated regularly (since the pressure is relatively low, it’s difficult to choose a suitable safety valve); it’s also a good idea to install a manual drain valve. If your jacket is large enough, the safety valve will easily activate during load adjustment, and the air can be manually released. Aside: The steam collection tank of my gas generator was originally designed for 0.3 Mpa; later, to increase the amount of steam produced, the upper and lower jackets were connected together. Since the upper jacket is at atmospheric pressure, the setting pressure of the safety valve is also reduced. It was done by the gas generator manufacturer; the top cover is made of thin metal, which often develops leaks, but no safety accidents have occurred. The prominent problem with gas stoves equipped with atmospheric pressure jackets is the relatively significant \"cold wall effect\"; in such stoves, it is difficult to ignite the flames on the sides when the diameter is greater than 3.0 meters, and it is hard to reduce the amount of slag and residual carbon. Unless there is truly no steam left, large-diameter furnaces should preferably not use a atmospheric pressure jacket. (In Haichuanli, aside from the synthetic ammonia sector, there isn’t much discussion on fixed-bed reactors.)
Our gas stove has a diameter of 3.2 meters; its upper jacket is used for heating phenol water, and it does not produce much steam. A 2-ton gas boiler is used to generate additional steam. It’s because no purge steam was used during the shutdown for maintenance; the system had to be purged with air instead, which is very unsafe. By the way, what is semi-desulfurization and what is modified desulfurization? How can the two be distinguished? I’m not familiar with desulfurization.