Application of Dynamic Simulation
Publication Date: 2009-May-05
The IP.com Prior Art Database
APPLICATION OF DYNAMIC SIMULATION FOR DESIGN AND COMMISSIONING OF LNG PLANTS (EXPERIENCE IN MLNG TIGA PROJECT)
APPLICATION D'UNE SIMULATION DYNAMIQUE POUR LA CONCEPTION ET LA COMMISSION D'USINES DE GNL (EXPERIENCE DU PROJET DE MLNG TIGA)
Encik Norrazak Hj. Ismail, General Manager
Mohd Soffie Ariffin, Senior Engineering Manager
Malaysia LNG Tiga Sdn Bhd
Bintulu, Sarawak, Malaysia
Hidefumi Omori, Senior Deputy Manager Hitoshi Konishi, Chief Engineer
Scott A. Ray, Senior Process Engineer, LNG
Charles A. Durr, Technology Vice President, LNG
Kellogg Brown & Root (KBR)
Houston, TX, USA
During the MLNG Tiga project, dynamic simulation was used by the EPC consortium of KBR and JGC working with project owner Malaysia LNG Tiga Sdn Bhd for several studies of plant design and verification of the plant performance. This approach proved to be very effective.
Acceptance of Tested Performance of the Refrigerant Compressors
The as-tested performance curves of the refrigerant compressors were used within dynamic simulations to verify that the refrigerant compressors, together with the actual performance of other equipment, would meet the requirements for LNG production.
Unique Power Exchange Concept between Gas Turbines
Both the MR compressor and propane compressor are powered by individual gas turbines. MLNG Tiga employs a unique power exchange concept between these two gas
turbines. The excess power available from the propane compressor gas turbine is transferred to the MR compressor via synchronous electric motors/generators. Excess power can also be fed to the 50 Hz plant electrical distribution system from the 60 Hz circuit via a Load Commutated Inverter, and vice versa.
Dynamic simulation was performed in order to ensure the robustness of these integrated electric and process systems during start-up/shutdown. The simulation model included a full representation of the propane, MR and the natural gas circuits. The process model was linked to an electrical simulation of the turbines and synchronous machines.
Plant Performance Verification
During the plant performance test, dynamic simulation was used to demonstrate the performance of the plant. Furthermore, the simulations were used to demonstrate that specified margins are available and to demonstrate that alternate modes of operation are possible as designed. The data collected during the performance test was reconciled against the simulation then actual values of key parameters were estimated. These estimated key parameters, such as tray efficiencies and overall heat transfer coefficients, were then entered into the simulation and design/alternative cases simulated on a rating basis and benchmarked against the systems criteria for success.
Through the use of dynamic simulation we can make future plants...