Rolls-Royce Holdings plc

02/23/2021 | News release | Distributed by Public on 02/23/2021 04:32

E-fuels powering a climate-neutral future

E-fuels powering a climate-neutral future

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Using e-fuels produced from green electricity, electricity generation and drive-power technology stands a good chance of going net-zero.

To stop global warming and meet the goals set out in the Paris Climate Accord, power delivery systems and energy systems will have to become carbon-neutral. To achieve this fuels are one of the key levers we have. With e-fuels produced from green electricity, electricity generation and drive-power technology may be able to become net-zero.

e-Fuel roadmap for power gen, marine and rail

Europe aims to be climate-neutral by 2050. Incoming US President Joe Biden has also announced this is the goal he will be pursuing.

This demands a technology rethink not just on power delivery, but also on new fuels. No matter how clean fossil fuel combustion engines may be, they will always emit CO2. E-fuels such as e-hydrogen, e-methane, e-methanol or e-diesel - produced from green electricity and carbon from the air, with some subsequent processing - are now opening up a new path to the future. The demand for e-fuels is huge, 20,000 terawatt-hours of fuel-based energy needed in 2050, according to an analysis undertaken by Rolls-Royce. In diesel terms, this equates to two trillion litres.

These new fuels are produced in a process known as Power-to-X.

It works like this:
Electricity produced from renewables such as wind or solar power is used to break water down into its components (hydrogen and oxygen) by a process of electrolysis. The hydrogen can be then used straightaway in a hydrogen engine, aircraft turbine or fuel cell. However, its relatively low energy density means it needs a lot of tank space and is therefore not easy to store and transport. Other fuels that can be produced from hydrogen have higher energy density and are easier to store. By applying more energy and adding carbon (either air-borne carbon or from biomass), it is possible to produce other synthetic fuels such as e-hydrogen, e-methane or e-diesel. This is how electricity is turned into fuel. It can be burned carbon-neutrally, as no extra CO2 is produced.

Other synthetic options are methanol and ammonia, the latter requiring no CO2 during synthesis. However, combustion engines have to be modified to run on synthetic fuels.

What are set to be the key fuels of tomorrow?

The big question now facing experts at Rolls-Royce is which fuel is set to be the most economical and most energy-efficient.

'When producing methane, methanol or kerosene from hydrogen, you have to apply additional energy and add CO2,' explained Daniel Chatterjee, Director of Technology Management & Regulatory Affairs at Rolls-Royce Power Systems. 'Methane or diesel could be used with existing technology and infrastructure.

Even so, ammonia or methanol might also come to the fore, especially in shipping, although there are still safety and infrastructure issues to be overcome,' he added.
The whole scenario is different for stationary engines used in power generation. For example, existing natural gas grids can be used to transport e-methane, and it is possible to produce e-hydrogen locally.
'I'm assuming we're going to see various different fuels in future, without any one of them becoming a panacea,' summed up Chatterjee, adding, 'The question of which fuels we consider so future-proof that we end up developing new MTU engines or other energy converters for our customers is going to be occupying our minds a lot in the coming months and years.'

New fuels need new drive-power tech

New products are required to convert these new fuels into drive power and energy.

We are already working hard on fuel cell and hydrogen engine technology. In the MethQuest research project, Rolls-Royce engineers are working on gas engine designs aimed at reducing methane emissions harmful to the climate, and on methanol and hydrogen combustion. 'Trials so far on the single-cylinder test stand are very encouraging,' said Chatterjee.
The fuel cell, too, is now proceeding to the next stage. January 2021 will see an initial stationary MTU fuel cell demonstrator go into operation in Friedrichshafen using fuel cell modules actually built to power road vehicles.

Political support needed

To meet all future e-fuel needs, large Power-to-X plants will be necessary.

However, it may be that distributed, smaller plants for synthesizing electricity into e-fuels are also a feasible, attractive option. Daniel points out that one essential requirement for these new fuels to succeed: political muscle. Without it, these fuels are not going to be economical in the foreseeable future.

'That's where I can definitely see a market for Rolls-Royce. If political decision-makers want to achieve the climate targets they've set themselves, they're going to have to build the overall framework and really get behind these fuels. That's the only way to achieve the goal of powering ships, trains, heavy goods vehicles and power plants climate-neutrally by 2050 - or even sooner.'

Daniel Chatterjee
Director of Technology Management & Regulatory Affairs at Rolls-Royce Power Systems
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