Variable Rich Period Control for NOx Catalyst SOx Recovery

The patent applies dynamics by making the rich period duration variable rather than fixed. The rich period length is dynamically adjusted based on the catalyst temperature: when the temperature is low (below threshold), the rich period is extended to ensure sufficient reducing agent reaches the downstream portion; when the temperature is high (above threshold), the rich period is shortened. This dynamic adjustment resolves the contradiction between reducing upstream SOx and ensuring downstream reducing agent supply.

The patent changes the parameter of rich period duration based on catalyst temperature conditions. By monitoring the catalyst temperature and adjusting the rich period length accordingly, the system optimizes the balance between consuming reducing agent for upstream SOx reduction and ensuring sufficient reducing agent reaches the downstream portion for re-occluded SOx reduction.

The system dynamically adjusts the rich period duration based on real-time catalyst temperature feedback. When catalyst temperature is high, the rich period is shortened to prevent excessive reducing agent consumption that would lower the SOx reduction rate. When catalyst temperature is low, the rich period is extended to ensure sufficient reducing agent reaches the downstream portion. This dynamic control resolves the contradiction between downstream reducing agent supply and overall reduction efficiency.

The patent changes the operational parameter of rich period length according to catalyst temperature conditions. This parameter adjustment ensures that the reducing agent is used efficiently: sufficient amounts reach the downstream portion when needed (low temperature), while avoiding wasteful consumption that would reduce the overall SOx reduction rate (high temperature).