A NOVEL DESIGN FOR 10-12 MTPA LNG TRAINS

摘要

Shell believes, along with many others, that the projected growth in LNG markets will translate into a demand for larger train sizes. This is primarily driven by economies of scale in terms of equipment costs, construction costs and project management.rnIn this paper, we present a new design for a large train producing LNG at a rate of about 11 Mtpa. The design is based on Shell's Parallel Mixed Refrigerant process, includes CO2 and sulphur treating, and will be flexible to reach heating values down to typical US specifications. Using large yet fully developed and proven gas turbines, and other key equipment, maximizes economies of scale. Care has been taken to retain multiple sourcing options for all equipment.rnSteam is used to integrate heat generation and demand plant-wide; this includes the waste heat recovery from the gas-turbine drivers, co-firing, and heat demand of the energy intensive treating train and heat production by the sulphur-recovery unit. The heat recovered is utilized for process heating and to produce mechanical and electrical power. The full utilization of waste heat from the gas-turbine exhausts enables a step-change in plant efficiency and reduces the specific CO_2 emissions considerably, compared to conventional LNG plant design.rnIn this paper, conceptual design choices are presented, followed by a description of the waste heat recovery system, key equipment considerations and a summarizing discussion.