LNG制冷HYSYS计算模型研究

Study on HYSYS Calculation Model for LNG Refrigeration

LNG是当今世界增长最快的燃料,目前LNG占全球天然气市场的5.6%及天然气出口总量的25.7%。为提高LNG储量,各国均建造LNG装置,并将此能源作为一种低排放的清洁燃料加以推广。由于国外资料没有提供关于LNG制冷的HYSYS计算模型,通过考察法国燃气公司设计的上海浦东调峰型LNG装置的运行参数,提出了混合冷剂制冷HYSYS计算模型方法。该方法原理是:两种或两种以上的混合物组成的冷剂,在一定的蒸发压力下和很宽的范围内完成蒸发,获得所要求的不同制冷温位,降低换热系统的传热温差,提高制冷系统效率。运用该方法通过HYSYS模拟研究发现:模拟的数据与现场运行数据较好吻合。模拟计算不仅为天然气的液化设计提供参考,还可对国内已建或拟建的LNG装置设计、参数优化及生产起技术支撑和指导作用。

At present,LNG is the fastest-growing fuel in the world and it has reached 5.6 % of global natural gas market and 25.7 % of total natural gas exports.LNG devices are being built in every country in order to increase its reserves and it is being popularized as a clean fuel with low emission.Investigated are process parameters of the LNG peak shaving device in Shanghai Pudong designed by French gas company and put forward is a HYSYS refrigeration method.The method has such refrigeration principle: the cryogen,consisting of two or more mixtures,will be evaporated under certain evaporation pressure within very wide range so as to achieve the required different refrigeration temperature levels,reduce heat transfer temperature difference of heat exchange system and improve the efficiency of the refrigeration system.HYSYS simulation study results show that the simulated data are identical with the site operation data,which can provide reference for LNG device design and can also provide technical support and guidance for design of domestic LNG devices under plan and operating parameter optimization of existing LNG devices.