INTEGRATED UTILIZATION OF COLD ENERGY FROM LARGE-SCALE LNG RECEIVING TERMINALS

LNG cold energy has been realized as an alternative energy with great potential.Therefore,this study estimated the value of available energy related to the gasifying pressure and temperature range,in terms of the exergo-economics.The potential cold energy of a 3 mmt/a LNG terminal when re-gasified at 8 MPa is up to 65 MW,or 1 billion kWh/a electricity.An engineering method,applying propane/butane and other cold media inventory/recycling system to solve the issue of non-synchronization both in time and space,which realize the integrated and cascaded use of LNG cold energy,has been described.The necessity and possibility of integrated utilization of LNG cold energy has been emphasized;the priority are in the air separation market for coal-based chemistry,proving up and exploitation of oil and gas,C2+ separation from natural gas,and other large scope cold industry.More than 70% LNG cold energy should have been utilized,through integrated creation and optimization based on a series of mature technologies.A huge energy saving and economic benefit could be expected.The key to realize this target is the synchronized plan and construction of LNG terminal with cold industry chain,as well as the coordination according to the marketing economy mechanism within the circle economic region.