Domestically developed technology: space furnace

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The space furnace represents a domestically developed fluidized-bed powder gasification technology that combines elements of the Shell and Texaco gasification processes; however, some aspects of its design and operation are not entirely clear. Specifically, the following points are listed: 1. When driving, the oxygen flow rate is not established by using vent lines; instead, the valve position is calibrated (using empirical values) to determine the oxygen flow rate. This method is not bad per se, but then why are two additional vent lines added to the oxygen pipeline? 2. After the gasification furnace has reached the desired temperature, it must be pressurized to 1 Mpa before feeding materials into it. From a safety perspective, why cannot feeding be carried out at atmospheric pressure? From the standpoint of process operation conditions, isn’t it more favorable for the materials to enter the furnace at atmospheric pressure?