ATCO and Praxair Developing H2 Infrastructure for Oil Sands
Report: Toyota’s Operating Loss Will Widen to US$4.5B

Biosyncrude Gasification Process Could Produce Motor Fuel at Cost of Around $3/gallon

Bioliq3
Overview of the Bioliq process. Source: Henrich et al. Click to enlarge.

The Bioliq biosyncrude gasification process (earlier post) used in a large plant with a capacity of > 1 Mt/a can produce biosynfuel for about €1.04 per kg or €0.8 per liter (US$3.08/gallon US), according to an analysis by researchers at Forschungszentrum Karlsruhe, Germany, which is co-developing the process with Lurgi.

With ±30% estimate error, this is between €0.56 and €1.04 per liter (US$2.72-5.03/gallon US), they note in a paper published in the journal Biofuels, Bioproducts & Biorefining. A crude oil price of US$100/bbl results in an approximate cost of €0.56/L (US$2.72/gallon US) without tax for conventional motor fuel.

Bioliq4
Energy flow in the bioliq process based on the stoichiometric reaction equations. Source: Henrich et al. Click to enlarge.

Bioliq is a three-stage process, envisioning the use of distributed fast pyrolysis (FP) plants in combination with a large centralized gasification and fuel production facility. Biomass is pyrolized to a pyrolysis oil. The pyrolysis oil is mixed with pyrolysis coke from the process to create a biocrude slurry for transport and subsequent gasification to syngas and subsequent catalytic conversion to chemicals and/or fuels.

A key technology in the process is the centralized oxygen-blown, slagging-entrained flow gasifier operating at high pressure above the downstream synthesis pressure to avoid expensive intermediate syngas compression, according to FZK. The reaction chamber is enclosed by a membrane wall, cooled with pressurized water and can accommodate feed with much ash. Because of the high gasification temperature (above ca. 1,200 °C), the raw syngas is practically tar-free and has a low CH4 content; thus simplifying downstream syngas cleaning.

In principle, they note, any pumpable fluid feed, which can be pneumatically atomized with oxygen and has a heating value above 10 MJ/kg, is suited as the feed for the entrained flow gasifier feed. The pre-conversion of biomass into the biosyncrude slurry via the distributed FP plants increases the feedstock flexibility considerably. The biosyncrude is well suited for energy-dense storage and transport, resulting in lower transportation costs and large biomass delivery areas.

Because of the complex technology to be applied, BTL plants for biosynfuel production can only be economic in large facilities, the researchers say. Furthermore, given the limitations on biomass conversion to biosynfuel, the FZK team sees an ongoing role for coal and natural gas derived synthetic fuels, likely combined with BTL in very large integrated XTL complexes.

The energy efficiency of biomass conversion to biosynfuel via syngas as intermediate is only about 40%. A substitution of the present 2008 global motor fuel consumption of 2 Gtoe/a would therefore require a biomass harvest of 4 Gtoe/a. This is four times the present global bioenergy consumption of 1 Gtoe/a and will probably be at the limit of a sustainable level. In view of the still-growing motor fuel consumption and many other competitive uses of biomass, a complete substitution of fossil motor fuels by biosynfuel is not only rather unlikely but almost impossible. A sufficient and sustainable long-term supply with liquid hydrocarbon fuels seems possible only for special applications where liquid fuels are hard to replace e.g., as aviation fuel. This sustainable level probably is less than a quarter of the future transportation energy consumption.

It is therefore likely, that during the inevitable development and transition to new transportation techniques, the still-abundant coal and also natural gas reserves will play an important intermediate role for several decades. Corresponding CTL and GTL technologies for oil substitution are available already today and can be combined with BTL technology in huge and more economic mixed XTL complexes.

...In a BTL plant, practically all biocarbon can be converted into biosynfuel in an environmentally safe way, if the required additional H2 is supplied from other sources, e.g., via coal gasification, and the produced fossil CO2 is completely disposed of with little additional technical effort. The biosynfuel production can at least be doubled in this way and the huge XTL complex can contribute via the economy of scale. The Karlsruhe bioliq concept is well suited for large XTL concepts with mixed feedstock.

—Henrich et al. (2009)

Resources

  • Edmund Henrich, Nicolaus Dahmen and Eckhard Dinjus, (2009) Cost estimate for biosynfuel production via biosyncrude gasification. Biofuels, Bioprod. Bioref. 3:28–41 doi: 10.1002/bbb.126

Comments

TM

sounds too complicated.

ToppaTom

Their analysis sounds refreshingly realistic - not blindly optimistic.
With (hopefully) minimal government support, it might reduce some of oil demand from the mid east (if it comes on line soon) - at least until better energy sources mature.

ejj

This sounds waaay too expensive also --- the Germans being brilliant with efficiency should be able to figure out a cheaper more effective way to do this.

Andrey Levin

I suppose biomass is considered to be free?

Growing of energy crop would double the price of biofuel. However, there is huge stream of waste biomass, paid off to be buried in landfills (demolition waste, forestry/lumber waste, etc.).

Alain

Every cent this fuel costs is finaly paid to people working in germany. So, even if the final cost of one litre of this biofuel were somewhat more expensive than imported oil, macro-economically it is still much cheaper than the imported oil.
To begin with, even before the people get paid, the state has earned its taxes, resulting in a net gain compared to foreign oil.

Aussie

This approach doesn't sound right to me. It will be too tempting to use increasing amounts of coal for two reasons; ease of collection and the need for a lot of bio residue to remain back on the farm or forest.

Also 'biocrude' sounds like something that could substituted for oil in a conventional refinery. What is needed is a process that scales down to the level of a farm, forest or waste dump. Perhaps there could be tradeoffs such as a cheaper but lower grade fuel for farm machinery, perhaps a gas not a liquid.

Alessio

Reading from the abstract:

"The breakdown of BTL synfuel manufacturing costs of ca. 1 /kg in central EU shows that about half of the costs are caused by the biofeedstock, including transport. This helps to generate new income for farmers. The other half is caused by technical costs, which are about proportional to the total capital investment (TCI) for the pyrolysis and biosynfuel production plants"

so yeah, the feedstock costs are taken into account. Anyway, I totally agree with Alain, is much better to spend more money but inside its own economy than to give money away to oil producing countries.

Scott

Substitution of motor fuels by biosynfuels not possible. Correct I would say against the current baseline of demand and biomass availability, but how would this balance be altered, say if algae became a viable feedstock?

Verify your Comment

Previewing your Comment

This is only a preview. Your comment has not yet been posted.

Working...
Your comment could not be posted. Error type:
Your comment has been posted. Post another comment

The letters and numbers you entered did not match the image. Please try again.

As a final step before posting your comment, enter the letters and numbers you see in the image below. This prevents automated programs from posting comments.

Having trouble reading this image? View an alternate.

Working...

Post a comment

Your Information

(Name is required. Email address will not be displayed with the comment.)