Question

In an FCC unit of an oil refinery, a key variable has sufficient cycles to maintain this process in the regeneration catalyst. Low circulation or poor catalyst fluidization can cause serious problems, including costly damage to the vertical tube, process closure or process destruction. Whether all this will lead to a reduction in production and maintenance costs by tens of thousands of dollars. In the worst case, the cost of closing the federal communications commission (FCC) department could be up to $1 million a day for up to seven days. The key challenge is to make sure that you have enough cycles as an advanced warning, when the process becomes unbalanced, so there is an appropriate time for the process to be fixed or damaged before the unit closes.

Scheme

To understand the problem, it's important to understand the details of its details in the FCC unit's regenerative riser and in normal circumstances, gas enters the vertical tube and spreads between the catalyst particles. When traveling down, the bubbles combine with other bubbles and then break down to produce a random pressure fluctuation or noise. In some conditions (low cycle, low catalyst fluidization) the catalyst will overinflate, causing the bubble to disappear and travel down. When this happens, the pressure along the pipeline increases and is not stable but unstable. In severe cases, the catalyst crosses the riser, leading to a "slimy flow" for the stop and starting catalyst flow. "Such flows cause severe pressure fluctuations no longer random, leading to the costly damage mentioned above. Historically, historical data from DCS have been used to identify these data processes. Because DCS tracking ability is slow, such a process does not detect upsets in time, resulting in huge maintenance costs. Early warning of this process will allow operators to take action corrective actions, control the process, and avoid closing to improve device utilization.