SPYRO for APC (SAPC) simulates the steady-state cracking process inside the radiant coil(s) of a steam cracking furnace in ethylene plants. It is based upon a fundamental kinetic scheme of more than 3000 reactions, representing a chain reaction mechanism of 128 molecular species and 20 radical species. SAPC is designed for use in the 3’rd party Advanced Process Control applications for ethylene plant operations.
The fundamental basis of the SPYRO program allows accurate prediction of several parameters, such as:
- Cracking severity (P/E ratio, M/P ratio, conversion)
- Maximum Tube Skin Temperature
- Coke Buildup
- Absorbed Duty
- Coil Pressure Drop
- Coil Outlet Temperature
Feedstocks from ethane up to heavy gas oil can be modelled in the SPYRO program.
Given the basic geometry of the radiant coil (pyrolysis reactor), SPYRO can simulate the performance of nearly any type of radiant coil in commercial use today. The furnace geometry is configured by TECHNIP for each optimization project in the pre-commissioning stage.
The input parameters of SAPC include hydrocarbon flow rate, dilution steam ratio, coil inlet pressure, coil inlet temperature, coke thickness, feed composition and specific adjustment parameters.
Advantages of using SAPC:
- Reduced variation in control parameters.
- Option to operate closer to the limits due to reduced variation.