How does Shell manage the coal cycle, and what specific tasks need to be carried out?
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In my opinion, the key to stable gasification operation lies in the stability of the coal pipeline – this is the most fundamental aspect, yet one that many people overlook. I would like to ask: what data needs to be determined in order to achieve a stable coal cycle, and what constitutes a stable coal cycle?
1. It is crucial to determine the stable operating parameters for the coal feed system; the adjustment of PID parameters is carried out at this stage. 2. The linearization of the measurement of the pulverized coal mass flow rate and its calibration. It is necessary to collect data such as density, velocity, differential pressure, and mass under different operating conditions. 3. If there are multiple coal conveyors, it is also necessary to adjust the parameters ensuring consistency in the measurement characteristics among different conveyors. 4. At present, East China University of Science and Technology has developed an online calibration system that addresses the shortcomings in the previous Shell coal line cycle calibration process; the investment required is less than one million yuan (it can be achieved with just a few hundred thousand yuan if costs are reduced), so it’s worth giving it a try
The moderator only gave a general idea. I would like to ask why there must be a minimum opening for the nitrogen acceleration – why must the flow rate at this point be ensured first, before allowing 13PV-0103 to operate in automatic mode so that the pressure can be adjusted. To ensure the pressure difference, it is possible to do so by setting the pressure of V-1205; moreover, V-1205 needs to be operated at different pressures for the coal circulation process. But isn’t it sufficient to just ensure the pressure difference between the coal pipeline and the vaporizer?
The coal cycle is quite important, as it has a direct impact on the entire system. I’m wondering if anyone has detailed information on the coal cycle; the setting of the oxygen valves also needs to be adjusted. How can the opening degree of the oxygen valves be determined based on the coal flow?