The Ammonia Plant advanced control package uses 3 modules of Axens' latest generation multivariable controller MVAC. It is designed to maximize the benefits from Ammonia Plant, in an environment with multiple constraints and complex multivariable interactions.
A 10 steps control strategy :
- Compensation for changes in feed quality. - Primary reformer firing control: coil temperature balancing. - Methane conversion optimization: reformer methane leakage control. - Feed flow maximization and constraints protection. - Steam/gas ratio minimization. - Compressor inlet pressure maximization, for energy savings. - H/N ratio control in synthesis loop, for stoechiometry - NH3 conversion optimization: converter bed temperature profile control. - Control of inerts concentration in synthesis loop. - Steam production management.
Inferentials
Axens inferential technology is used for on-line estimation of: - Primary reformer skin temperature. - Methane leakage.
Benefits
- Increase of Ammonia production (+ 4 % ) - Reduction of energy consumption ( - 5 % ) - Increase of steam export - Improvement of operational stability - Safe protection of plant constraints - Increased catalyst run length - Reduction of the complexity of operator workload
