STEADY STATE AND DYNAMIC MODELING OF GAS TREATING AND SULFUR RECOVERY UNITS

VMGSIM

VMGSim is a next generation process simulator with an integrated flowsheet design in a user-friendly, modern environment that allows amine, sulfur, and tail-gas units to be seamlessly linked within a single project. An unprecedented degree of flexibility and usability is available whether using the embedded Excel Unit Operation, Optimizer, or the Case Study tool to analyze design and operation strategies. VMGSim is also the only process simulator with the ability to dynamically simulate a full sulfur recovery unit.

VMGSim features industry leading out of the box tuned and validated thermodynamic property packages for sulfur recovery unit (Claus) modeling as well as amines and physical solvents. These purpose-built thermodynamic models are backed by decades of experimental and industry data.

SULFUR RECOVERY UNIT MODELING

• VMG’s Claus model addresses the most important aspects of physical properties related to sulfur treatment such as accurate Gibbs free energy modeling of gas and sulfur species, enthalpies, densities, hydrogen sulfide solubility in molten sulfur and complex interactions in the liquid phase that affect viscosities.

• The exclusive partnership with Sulfur Recovery Engineering (SRE) and VMG provides a best-in-class sulfur modeling solution.

• SRE-VMG correlations are available for the Claus Reaction Furnace leading to realistic predictions of outlet compositions of sulfur vapor, COS, CS2, CO, and H2. These correlations were developed by combining many years of accumulated sulfur unit data with thousands of individual plant runs.

• Supported Plant Configurations: gas plant or refinery, high-efficiency or old-style burners, straight-through or front-side split, oxygen enriched or natural gas co-fired.

• SRE-VMG COS and CS2 hydrolysis correlations now available for regular alumina, promoted Titania and full Titania catalysts.

• New option to estimate Heat Loss in Claus Reaction Furnace.• Custom correlations can be implemented without any coding allowing

for complete control of your simulations. VMGSim’s model regression tool can also be used to fit correlation parameters to a given set of data.

• Full slate of flexible and user friendly SRU specific unit operations available within the native VMGSim environment designed to model SRU’s and associated processes.

• Advanced capabilities to account for furnace kinetic effects, converter conversions, and calculating dew point margins etc.

DYNAMIC SIMULATION OF AN SRU

• VMGSim’s unique capability to dynamically simulate a full sulfur recovery plant allow for a higher level of process understanding and optimization than ever before.

• A wide range of studies can now be performed, such as benchmarking performance of existing operations, unit de-bottlenecking, control system evaluation, and review/development of operating procedures and training.

• VMGSim allows you to switch between steady state and dynamic models, or to construct a dynamic model alongside your steady state model, so you can work with both models simultaneously.

• Use VMGSim’s scheduler unit operation to trigger time based or event based actions then view results in tabular or graphical form within customizable strip charts.

ACID GAS TREATING

• VMGSim works with ease when modeling mixed chemical solvent solutions and solutions that include physical solvents with no special parameters or inputs required. Solvents include MDEA, DEA, DGA, MEA, Piperazine, AMP, DIPA, Potassium Carbonate, Sulfolane and TEA.

• Physical Solvents property package includes Coastal AGR, Dimethyl Ethers of Polyethylene Glycol, Propylene Carbonate, Normal Formyl Morpholine, Normal Methyl-2-Pyrrolidone, Methanol, and Genosorb.

• Advanced tower convergence requires little to no user modification by automatically modifying the tower solution method allowing the user to concentrate on process modeling and understanding instead of mathematical details and awkward indirect specifications.

• Mass transfer multipliers allows for adjustment of your models

to match plant performance in a simple and consistent manner if required.

• An exclusive alliance links Optimized Gas Treating’s ProTreat™ to VMGSim with an integrated unit operation provides access to the power of ProTreat’s rate-based modeling system.

THERMODYNAMICS AND PHYSICAL PROPERTIES

Developed entirely in-house and extensively validated, VMG’s Claus model is a complete solution for modeling sulfur treatment systems using Claus reactions.

VMG’s Claus model addresses the most important aspects of physical properties related to sulfur treat-ment such as accurate Gibbs free energy modeling of gas and sulfur species, enthalpies, densities, hydrogen sulfide solubility in molten sulfur and complex interactions in the liquid phase that affect viscosities.

VMG’s Claus property package provides quality physical property values for thermodynamic equilibrium calculations as well as physical properties necessary for the design or simulation of pumping and piping systems.

CLAUS UNIT OPERATIONS

VMGSim provides you with the best selection of unit operations specially designed to model Claus type processes. These include Reaction furnace, Waste Heat Boiler, Claus Converter, Indirect Reheater, Direct Fired Reheater, Claus Oxygen Calculator, Sulfur Condenser, Hydrogenation Reactor, Reducing Gas Generator, Selective Oxidation Reactor and Sulfur Pit.

These unit operations were designed to include specialized functionality specific to modeling SRU’s.

CLAUS CONDENSER OPERATION

The Claus Condenser operation models a sulfur condenser and as such monitors the sulfur redistribution among the Sx species.

Easily adjust the amount of Sulfur entrainment in the vapor outlet and the amount of H2S in the liquid outlet.

SULFUR PIT OPERATION

The Claus Sulfur Pit operation is designed to provide a convenient means of calculating the stage recoveries and cumulative recoveries. The Claus Sulfur Pit also has the ability to adjust elemental sulfur and H2S in the vapor and combined liquid outlet.

EMBEDDED SULFUR DETAIL

In addition to special Claus unit operations VMGSim gives you the ability to see details in any stream important to Claus plant simulation. The information can be used for display purposes or be directly integrated into flow sheet calculations, with properties such as Sx Properties, H2S to SO2 ratio calculator, Excess Air, and Sulfur Dew Point.

CONSISTENT FLOW-SHEETING ARCHITECTURE

VMGSim’s unique Claus modeling capabilities share all the benefits of its architecture and all unit operations and features that are available in VMGSim.

This allows for an unprecedented degree of flexibility and usability. Use the Excel Unit Operation to explore important process parameters like Excess Air Set Point, Converter Inlet Temperatures, Minimum Dew Point Margins, Fuel and Air flow rates and cumulative recoveries.

CASE STUDIES

VMGSim includes a powerful case study tool that allows for virtually every variable in the entire simulation case to be included as required in scenarios studies. Case studies are easily created and configured. For instance, a quick example below shows the impact of the Excess Air on the Overall Recovery of Sulfur as well as the Furnace Outlet Temperature’s response to the H2S concentration of the Sour Feed.

EMPOWERING PROCESS SIMULATION

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