(328b) Application of Dynamic Heat Exchanger Design in Natural Gas Liquefaction Process
AIChE Annual Meeting
2016
2016 AIChE Annual Meeting
Process Development Division
Advances in Process Intensification
Tuesday, November 15, 2016 - 12:55pm to 1:20pm
The paper discusses transient Aspen HYSYS modeling and optimization of two natural gas liquefaction processes and identifies the rate-limiting components during load variations. The optimized model for both processes provides details for comparison. Novel flowrate variations included in this investigation drive transients responses of all units, especially compressors and heat exchanger. Heat exchangers commonly represent the most sensitive components to transients. This sensitivity decreases when using new heat exchanger designs and control methods. Model-predictive control (MPC) responses compare favorably with results using traditional controls. Transient efficiency graphs for both designs illustrate improvements during model predictive control. These new controls and designs optimize natural gas (NG) consumption and liquefied natural gas (LNG) production.