INTRODUCTION TO SOUTH HOOK COMBINED HEAT AND POWER (CHP) PROJECT

摘要

South Hook LNG Terminal sponsors, Qatar Petroleum International, ExxonMobil and Total, are evaluating an innovative concept of building a combined heat and power plant (CHP) at the terminal. This integrated concept would improve heat efficiency resulting in a reduction of fuel use and regional CO2 emissions by greater than 20% as compared to vaporizing LNG and generating the power separately. Commissioned in March 2009, South Hook LNG Terminal at Milford Haven, Wales, enhances UK energy diversity and security with the ability to deliver 2.1 billion cubic feet of natural gas daily into the national grid. In the current LNG vaporization process, natural gas is consumed as fuel to gasify the liquid LNG. The combined heat and power project, which is currently being evaluated by the terminal sponsors, is aimed to replace vaporization fuel use with the residual heat of the power plant. The heat generated by the gas combustion in the power plant would be used three times to maximize efficiency: (1) direct combustion in a gas turbine to produce electricity, (2) exhaust from the gas turbine generates steam to drive a steam turbine for additional electricity, and finally, (3) residual low grade heat from the steam turbine is used to vaporize the LNG. The key project challenges are developing the integrated design and engineering the LNG combustion vaporizers to ensure effective use of the heat.