Reinforced feeding self-protection interlock problem
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Now our unit has feed self-protection in place; the pre-lift steam and atomization steam have both been disconnected. In other words, once the feed auto-start is activated, the pre-lift and atomization steam volumes remain unchanged. What’s wrong with doing this? Have you removed the device? I hope everyone will participate actively in the discussion!
It’s not good, as it can easily cause blockages in the lift pipe and interrupt the fluidization in both units.
It’s not that the pre-heated steam and atomized steam are both removed; rather, the current design does not provide a separate emergency steam system – in other words, such emergency steam lacks a safety valve as well as a separate feed pipe inlet. The accident steam is combined with the pre-lift steam and injected together. During normal production, the injection rate for the pre-lift steam is calculated based on a linear velocity of 3–4 m/s in the pre-lift section; when feeding is stopped, the injection rate is calculated at a linear velocity of not less than 8 m/s (with the riser outlet being directly connected without any sealing). For hermetically connected direct connections, it is necessary to control the VSS line speed to be either below 8 m/s or above 148 m/s. Pre-raising with unchanged misting steam volume – this is an incorrect operation. You can consult the design institute.
Ours has not been cut off; both the raw oil atomization steam valve and the pre-lift steam valve are fully open