液化天然气空温式气化器应用能耗分区

Energy consumption zoning of application of liquified natural gas ambient air vaporizer

受地区气候差异的影响,液化天然气(Liquified Natural Gas,LNG)空温式气化器的气化效果存在明显地域差异。文章基于我国2010—2017年的气象数据,通过分析LNG空温式气化器应用中产生的辅热器能耗影响因素,采用相关分析和离散分析对关键气象影响因素进行降维,并基于能耗分析提出空温式气化器的应用能耗分区指标——辅热器度日数EDD(t s);采用协同克里金法对分区指标进行空间插值,结合K-均值聚类算法和分级区划方法将我国LNG空温式气化器应用能耗气候区划分为零能耗区、近零能耗区、低能耗区、中能耗区、高能耗区和超高能耗区等6类。在零能耗区,全年气温高于空气基准温度(19℃),LNG空温式气化器连续运行8 h可保证天然气出口温度不低于标准规定值(5℃);在其他气候区,LNG空温式气化器在运行周期内需串联辅热器才能保证天然气温度不低于5℃,且近零能耗区、低能耗区、中能耗区、高能耗区和超高能耗区的全年辅热器能耗依次增加。

The performance of Ambient Air Vaporizers(AAVs)for Liquefied Natural Gas(LNG)exhibits notable regional variations due to climate differences.Based on meteorological data in China from 2010 to 2017,this paper analyzes the factors influencing the energy consumption of the auxiliary heater in LNG AAV applications.Through correlation and discrete employed,key meteorological factors are dimensionally reduced.Using an energy consumption analysis,the auxiliary heater degree days(EDD(t s))is defined to be the energy consumption regionalization index of LNG AAV.The Co-kriging method is employed to the spatial interpolation of EDD(t s),and a K-means clustering algorithm is used for the energy consumption zoning.The resulting zones for the application of LNG AAV in China are classified into six categories:zero,near-zero,low,medium,high and super-high energy consumption zones.In the zero energy consumption zone,where the annual temperature exceeds the auxiliary heater degree days(19℃),continuous operation of LNG AAV for 8 hours ensures that the outlet temperature of natural gas is not lower than the standard value(5℃).In other climate zones,LNG AAV may need to operate auxiliary heaters within the operational cycle to ensure that the natural gas temperature is above 5℃.The annual energy consumption of auxiliary heaters increases successively in near-zero,low,medium,high and super-high energy consumption zones.