COILSIM1D boosts profitability of steam crackers by maximizing yields and optimizing the process, using highly accurate reactor simulations for a broad range of feedstocks, reactor geometries and operating conditions.

It is the result of several decades of expertise of the Laboratory for Chemical Technology (LCT) of Ghent University in independent research and modeling of cracking reactions. The microkinetic model incorporated in COILSIM1D is the broadest and most accurate reaction network for steam cracking of hydrocarbons.

Main features

COILSIM1D combines a very user-friendly interface with its robust kinetic network to provide users with valuable results in just a few steps.

  • Reactor simulations are possible with different boundary conditions
    • Fixed COT
    • Fixed P/E or M/P
    • Fixed conversion(s) or yields
  • Automatic or user-specified heat flux or temperature profiles
  • Feedstock reconstruction
  • Furnace simulations
  • TLE simulations
  • Run length simulations

SIMCO feedstock reconstruction

SIMCO allows users to obtain a detailed reconstructed composition of feedstocks ranging from light gases to heavy gas oils, based on common commercial indices. Sulfur-containing components can also be reconstructed.

  • PONA(+), PIONA(+), SOA
  • Distillation data: TBP, ASTM D86, ASTM D2887
  • NMR data

Reconstructed feedstocks can be used directly as input for reactor simulations, or users can input a detailed feed composition manually.


Reactor geometry flexibility

Built-in geometries of the main reactors of various manufacturers are available. Other geometries can be easily implemented with the New coil geometry tool. Various coil materials and fins (straight, riffled, spiral) are supported too.

Reactor simulations

A variety of routines are implemented in COILSIM1D, allowing users to easily study different aspects of their process

  • Product distribution
  • Yield maximization
    • User defines the relative importance of products
  • Run length simulations
    • Specific coke deposition models for gaseous and liquid feeds
    • User-defined operational limitations (T, P)
  • An adiabatic volume can be included downstream of the reactor, enabling users to evaluate the effect of transfer lines on product composition.

The main simulation results are conveniently summarized in a table and presented graphically, allowing users to rapidly obtain a general overview of the outcome of the simulation.


TLE simulations

COILSIM1D incorporates a TLE simulation module that enables users to carry out simulations using different boundary conditions:

  • Specific mass flow of water
  • Specific steam quality
  • Full thermosyphon simulation

A specific model for the deposition of condensation coke is implemented for the TLE, providing users with a very accurate tool for the estimation of run length based on the intensity of fowling in this section.

Furnace simulations

It is the newest addition to COILSIM1D. It simulates both the radiant and convection sections of a cracking furnace, allowing users to estimate process parameters of interest:

  • Flue gas temperature
  • Utility steam production
  • Bridge-wall temperature

COILSIM1D supports different tube bundle arrangements and allows users to customize the fuel gas composition. Floor and/or wall burners can be specified in the firebox, and a dedicated evaporation model is used for convection section


The simulation and optimization software for the ethylene industry