Regarding the limit setting of the central oxygen flow control valve
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Which manufacturers currently apply limit settings to the central oxygen flow control valve, and what are those limits?
Why is limiting necessary? No fear of coal slurry blowing in while parking.
The limit setting does not fix the valve position; rather, it restricts the degree to which the valve can be opened. A common practice among some manufacturers is to set the oxygen valve at a certain position and then use adjustments to the coal slurry to control the temperature. We do not impose any limits on the central oxygen valve; when the load fluctuates greatly, adjusting both the oxygen supply and the coal slurry can be beneficial. However, this approach also carries certain risks for those who are not experienced in operating such systems. Therefore, the decision should be based on the specific circumstances.
What do you want to do with the central oxygen limit? No, just add a orifice plate directly.
In our center, the oxygen valve must be opened to more than 30% before feeding can begin
What he meant was that there is no separate nitrogen purge line designed for the central oxygen; the valve for central oxygen is equipped with a mechanical limit, and during shutdown, central oxygen is purged together with epoxy, using the same nitrogen gas used for purging epoxy. It is generally limited to 15%.