Steve Bee, Commercial Director of marine fuels testing company VPS, in December 2024 elaborated on the increase in demand in biofuels based on the number of samples VPS laboratories are receiving and its biofuel testing innovations: 

Introduction

It’s very apparent, global shipping’s drive to decarbonise is well underway. The ship-building profile is changing dramatically, highlighted by the 2023 order book showing 539 new builds capable of running on low-to-zero carbon fuels, being ordered. Looking at Jan-Sept 2024, 49% of the gross tonnage on order were for vessels configured to be alternative fuels ready, with this specific order book growing by 24% year on year. It’s obvious that shipping is keeping its options very much open and looking for as much flexibility as possible, when it comes to the fuel choices for its ships.

The industry currently bunkers 230 Million mt of fuel per year. Burning this fuel equates to emissions of 716M mt of CO2-equivalent, as the majority of the fuel burnt continues to be traditional fossil fuels. This is supported by studying VPS fuel sample receipt for 2023 which was, 54% VLSFO, 30% HSFO, 14% MGO and 1% each for ULSFO and Biofuels.

However, the list of environmental legislation and directives to reduce emissions from shipping is ever-increasing in order to reduce SOx, NOx, Particulate Matter, CO2, Methane and other Green House Gases.  It is this regulatory demand which is driving the developments of numerous alternative low-to-zero carbon fuels for marine use.

But it is biofuels, which currently offer an attractive and immediate path to CO2 reduction. As a “drop-in” fuel option, using existing delivery, storage, fuel-transfer and engine operation processes, biofuels provide a decarbonisation solution, with minimal change.

VPS has been and continues to be, at the forefront of fuels research & development and continuing our innovative development of test methods for such fuels. We are working on numerous biofuels projects with the Global Centre for Maritime Decarbonisation (GCMD), sea trials with ship owners and operators, plus working with both fuel suppliers and additive manufacturers to assist in their product developments.

Biofuels

So what’s the biofuels story today? We are seeing an exponential increase in demand based upon the number of biofuel samples we are receiving in our laboratories, linked to the actual metric tonnes of biofuel being delivered per stem. Between 2021 to 2023 biofuels samples received by VPS increased from 70,000mt to 558,000 mt delivered. This year biofuel samples received by VPS will surpass 700,000 mt of biofuels delivered.

Singapore exceeded 2023’s delivered quantity at the half-year point of 2024 and Asia Pacific more than trebled biofuel bunkerings vs last year, as we go into the final quarter of 2024.

Europe is on track to do 40% more than last year if delivery rates continue as they have been.

2024 has seen lower percentage bio-components, ie B10-B30 increase in demand, whilst a significant reduction in higher bio blends, ie B100.

This is likely to be price-driven, as the amount bio content of the fuel is at its premium versus traditional fuels. B20s running around 17% more and B30s running at 23% more than conventional fuels.

For FAME-based biofuels, there are six key quality considerations to take into account.

Firstly, Oxidation Stability, as FAME can oxidise and destabilise very quickly. As FAME destabilises, it becomes considerably darker in appearance, more viscous and much more acidic. VPS utilise three tests to establish a fuel’s level of stability: The Rancimat test, which is a deliberate aging test, where we look to implement a “traffic-light” assessment of Green for a > 8 hours result, Amber for a 5-8 hour result and Red for a<5 hour result. We can then use the Iodine Value test to measure the degree of unsaturation and potential reactivity of the biofuel and thirdly, the Polyunsaturated Fatty Acid content determination via GC, to measure Linoleic Acid and Linolenic Acid levels.

FAME has poor cold-flow properties and so we use the traditional tests of cloud point, cold-filter plugging point and pour point to determine these. Except when the blend is with a dark fuel, then we use the proprietary VPS Wax Appearance Temperature Test.

FAME can be very corrosive, so we test for Total Acid Number, but also undertake Copper and Steel corrosion testing as FAME can be corrosive towards certain surfaces.

As FAME loves water, this can create a breeding environment for bugs and so Bacteria/Yeast/Fungi testing is a key test to monitor the level of microbial activity.

Knowing the calorific value is essential and with fossil fuels this can be determined by a calculation within ISO8217. However, due to the higher oxygen content of FAME, this calculation is inaccurate for biofuels where the FAME content is greater than 10%. and therefore, the laboratory test ASTM D240 must be used to determine the energy content.

Many test to determine the renewable content of biofuel have poor repeatability and reproducibility. To overcome this, VPS have modified EN14078 to produce a much more accurate determination of renewable content, which is and will be, so key in ensuring correct levels of carbon taxation is paid by vessels.

Note: The full article by VPS can be viewed here. 

Related: GCMD, VPS provide innovative means to detect fraud in sustainable biofuel supply chain

Photo credit: VPS
Published: 6 January, 2025