Research on method of checking and measuring energy utilization efficiency for quayside container crane

With the improvement of public awareness of environmental protection, the energy utilization efficiency of the key container terminal operation system, quayside container crane, has attracted increasing attention. Against this backdrop, this paper tries to provide a method to check and measure effective energy, supply of energy and energy utilization ratio of quayside container crane on the basis of Chinese Standard.In the first place, the testing process is set up according to Chinese Standard The method of checking and measuring energy utilization efficiency for port electric-crane (JT/T 314-2009). This Standard, released in 2009 and enacted in 2010 by Ministry of Transport of the People’s Republic of China, regulates the methods of how to collect operation data of spot testing, how to measure supply of energy, and how to calculate effective energy of mechanic structure of container crane and so on. HIOKI Power Quality Analyzer 3198 is used as the measuring instruments of the testing; and Shanghai ZP style 65t quayside crane produced by Zhenhua Heavy Industry Co., Ltd. (ZPMC) as the measuring prototype. The testing is arranged under six steps: (a) idle loaded hoisting mechanism with upward motion; (b) idle loaded trolley with horizontal displacement; (c) idle loaded hoisting mechanism with descending movement; (d) on loaded hoisting mechanism with ascending movement; (e) on loaded trolley with horizontal displacement; (f) on loaded hoisting mechanism with descending movement. These six steps present six working conditions, which constitute a full testing cycle of the container crane. Three cycles of testing are set up in order to minimize the testing errors. With formulas of effective energy, supply of energy and energy utilization ratio from Chinese Standard JT/T 314-2009 and relevant data from the testing, the result shows as follows: in a full testing cycle, the effective energy approximately amounts to 1.17x107J; supply of energy approximately amounts to 2.178x107J; the energy utilization ratio approximately amounts to 53.7%. The testing result shows that it is actually practical to measure effective energy, supply of energy and energy utilization ratio of the quayside container crane. This paper may also do some help in measuring energy utilization efficiency of other relevant kinds of port machinery.