TurboTime Podcast: Debunking Machinery Decarbonization Myths

In this episode of the TurboTime podcast, Myth Busters Klaus Burn of Ebara Elliott Energy and Rainer Kurz of RKSBenergy LLC dive into electrification: what it is and debunk the myth that it and machines—such as hermetically sealed compressors and high-speed electric motor drives—hydrogen blending and others are decarbonized.

TURBO: Can you break down the assertion that that machinery electrification and electric-motor drives are a decarbonization myth?

Brun: There are a lot of decarbonization myths that don’t just have to do with electrification and electric motors and hermetically sealed drives and high-speed motors, but they also have to do with hydrogen blending, unburned hydrocarbons and gas turbines, and other types of emissions that are part of the sustainable energy economy. What we set to do, however, is talk about electrification, which is basically when you take a turbomachine, a compressor or pump, and instead of running it with a driver—e.g., a gas or steam turbine, which has been done traditionally at a lot of compressor stations, pipelines, or in refineries, ethylene plants, or other places—you actually replace them with an electric motor. And, obviously, an electric motor does not have any emissions directly; it just shifts the responsibility of the carbon production from where you utilize the electric motor to where the electricity comes from. And the last time I checked, at least in most of the industrialized nations such as North America, 60% of all fossil electricity comes from fossil fuels, a mix of natural gas and coal. China actually has more—I think 70% of the electricity comes from fossil fuels, mostly coal, which is very dirty. Europe is not quite as bad. They now have about 40% alternative energies, but still a substantial part. So, you're really just shifting the carbon emission from one place to another, sometimes in a very, very inefficient way.

Kurz: In a way, this discussion is always about where you draw the emissions boundaries. Klaus is right: As soon as you can shift your emissions outside your boundaries, you can claim you are carbon-neutral, whereas, in reality, you just made somebody else deal with your carbon emissions. There are quite a few studies that address that one way or another and very clearly show if you make electricity while creating CO₂ or other emissions, you may create more emissions with an electric driver than with a driver that’s driven by fossil-fueled engines.