【作者】

David Atkinson

【摘要】

该论文已在芬兰赫尔辛基举行的第28届CIMAC大会上发表。论文的版权归CIMAC所有。Much of the heavy fuel oil, burnt in the cylinders of large 2-stroke marine diesel engines, is contaminated with hard particles known as catalytic (cat) fines. These particles, which find their way into the fuel at the oil refinery, can cause catastrophic abrasive damage to engine cylinder liners during the combustion process. This problem has been inadvertently exacerbated by recent changes to the regulation of marine air pollution because it has driven the use of cat-fine prone, low-sulphur fuel oils. As a means of self-preservation, vessels collect representative fuel samples during bunkering and then send them off for laboratory analysis. However, the test results often only become available once a ship has set sail and is far out to sea, by which time significant engine damage may already be in progress. This problem is tackled by a number of proprietary onboard products that can provide direct or indirect indications of cat fines in fuel as soon as the main engine(s) begin(s) to run. Onboard measurements also enable the continuous monitoring of the concentration of cat fines reaching the injectors after the bunkered fuel has been cleaned by the onboard purifying system. This paper begins by reviewing the various laboratory and onboard techniques that are currently used for cat fine determination; these techniques include inductively-coupled plasma atomic emission spectroscopy (ICP-AES), magnetometry, nuclear magnetic resonance spectroscopy (NMR), and x-ray fluorescence spectroscopy (XRF). A new, cost-effective method, which has the potential to yield results on board a ship within a few minutes, will also be introduced in this paper. Experimental results demonstrate that the new test is capable of identifying fuel samples that have a cat fine concentration of > 60 ppm (Al + Si), and which therefore exceed the limit recommended by ISO 8217:2012. In fact the test has been specifically designed to provide the crew with a clear sail or don’t sail indication with regards to fuel quality.

【会议名称】

第28届CIMAC会议

【会议地点】

芬兰 赫尔辛基

【下载次数】

4

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