Renewables are the flavour
of the month with a broad consensus in the scientific community that
our continual reliance on burning of fossil fuels is the road to
perdition. Resulting climate changes through increased levels of
greenhouse gases will probably destroy civilisation within the
projected lifetimes of many people alive today and set in motion
unstoppable, drastic changes endangering or exterminating most life
on earth in the longer term.
We understand the
mechanisms, some of which are not rocket science. You can check out
the behaviour of salt water at the poles in your own freezer with a
thermometer. Sea ice is fresh because salt water freezes at a lower
temperature, separating out the salt which falls as super saline,
super cold and oxygenated water into the ocean deeps and makes its
way around the world ever so slowly, stabilizing temperatures on the
planet and allowing marine life in the ocean depths. It takes no
great leap of imagination to work out what will happen in the deep
ocean should the sea ice and polar currents be disrupted by fresh,
light meltwater and fail.
The major engine of heat
transfer becomes the atmosphere with super cyclones and a 'storm of
the century' on a weekly basis. As for marine life think of an
aerobic biology shifting to an anaerobic one. Fish can live only in
the surface waters aerated by wave action. And in the depths without
oxygen the element of choice for metabolic activity goes to the next
line on the periodic table, which is sulfur and that implies a whole
different set of organisms. Think rotten eggs but hydrogen sulfide
only stinks in low concentrations. At higher ones it is undetectable,
other than by falling over dead like the coal miner's canary.
Sulphur being much in demand, the concentration in water drops
steeply.
A biodieseler I know
applied to the government for $300 thousand to set up and produce
biodiesel from algae. They were intrigued and offered to match his
own contribution of $150 thou and he was highly offended. I have no
idea where he intended to grow algae in quantities – it would take
large networks of channels of wastewater and stagnant lakes, none of
which are available in Tasmania. His plan was motivated by a figure
for oil production in algae which can produce up to 45% oil by weight
of dry matter. This is far better than a crop like canola. I argued
that he would never be able to grow and maintain a pure strain
outdoors that would match up with a figure like that – algae is
like any other plant and it is in the interest of the organism to put
its efforts into cellulose, starch and sugars. But it seems I was
wrong, research suggests the only criterion is maintaining a low
sulphur level, which may be difficult in our world but is the rule in
seven dead oceans like in Bob Dylan's song 'A Hard Rain's Gonna
Fall'.
So this is the reset
button. The plankton have gone and been replaced by massive blooms of
algae fertilised by the rain-eroded topsoils of the planet and they
will fix the CO2 we have so thoughtfully liberated from fossil fuels.
When the algae dies it sinks into the dead zone and falls to the
bottom unprocessed by bacteria or any living thing to be once again
sequestered as oil shales which cannot be laid down in our familiar
world which sequesters CO2 as limestone via coral polyps in oceans
and vegetation on land. (The reefs are coming to an end too as we
saturate and thereby acidify the oceans with CO2.) But the shales are
here now, a relic of the great Permian die-off, proof positive it
has happened before. So go for it kiddies, there are these fossil
fuels laying around; free energy for the taking. So why should we
consider 'renewables' like vegetable oil and ethanol as motor fuel?
The short answer is that
we shouldn't. During the big global oil price shock President Bush
worked to make America independent of the gouging Saudis. To this end
ethanol plants were built, midwest maize growers subsidised and
ethanol content mandated in petrol. The price of maize rose with the
increased demand and even the Mexicans got into the act shipping
their local staple northwards which led to food shortages and riots
in Mexico City. Fermenting maize into ethanol returns about 30% by
weight and if an SUV takes 70 litres in the tank, that has required
about 200 kilos of maize which is a year's ration for a poor Mexican
family, all for your one wind-in-the-hair long holiday weekend. Truly
these things are the cars that are eating the world.
And there are other
options that become useful in times of crisis. My neighbour during WW
II was too young to enlist, but worked on the home front growing and
delivering potatoes to the dock in Burnie. The truck had a petrol
tank but as much of the driving as possible was done on producer gas.
Silver wattle charcoal was burned in a vessel behind the cab with
restricted air supply and water sprayed into the flames. Carbon
monoxide and hydrogen were produced as the oxygen was stripped from
the water and along with CO2 was sucked into the manifold giving just
about enough power to help the heavily laden vehicle get to the
coast, freewheeling as much as possible. When he came to a hill he
would give it a judicious dose of petrol to get to the crest and of
course the return trip uphill was made with an empty vehicle. But
never underestimate the insanity of our leadership, this is not dead.
'Blue Hydrogen' is now on the lips of coal enthusiasts. We can keep
mining and burning brown coal and similarly separate the combustion
products with special membranes, converting it to clean hydrogen fuel
which the Japanese want to buy as long as it is made somewhere else.
Unfortunately the atmosphere is common property and 'somewhere else'
doesn't exist anymore.
Biodiesel
from waste restaurant oil(which is what this is all about)
Biodiesel is made from
vegetable oil heated with methanol and a catalyst in a simple process
– a colorimetric titration is done to work out how much fatty acid
has been produced by oxidation in the fryers. A calculated amount of
Potassium hydroxide, (usually 13 grams per litre of oil) is mixed
with methanol (20% of the oil volume) to produce a poisonous liquid
called methoxide. Added to dry 60 degree C veg oil in a processing
tank with a conical bottom it raises the pH of the mix to 8.3 which
is where the reaction takes place. In an hour of stirring the heavy
glycerol fraction is stripped from the fat molecule (triglycerides)
and replaced by the methanol. Next day the byproduct, a brown syrupy
mix of glycerol, excess methanol and potassium is removed through a
valve on the bottom of the processor. The biodiesel is clear yellow,
about as thin as diesel or sewing machine oil and has a sweet smell.
It is then washed with water three times and dried with a heating
element and I add a biocide because it is quite digestable by a
number of different organisms that can turn it (over years) into
asphalt and acids which destroy fuel systems. Compared to dino diesel
it is quite palatable, smells a bit like fish and chips and the dog
needs to be restrained or he will drink the stuff.
Animal fat may also be
used. I don't get this any more because everyone has gone into blends
of canola with palm oil. Bio produced from fat has a couple percent
more energy but starts to coagulate at about 5 degrees as opposed to
3 degrees for oil based fuel. It is also rich in stearates which are
a fatty chemical with a very high melting point that coagulates on
metal surfaces and in fuel filters and is relatively difficult to
shift.
The
Economics of Biodiesel
This doesn't come close to
being a viable candidate to save the world. Do-gooders in the
European parliament mandated a couple of percent biodiesel at the
European pump which didn't do much more than motivate the destruction
of rainforest in Malaysia, Borneo and Indonesia for oil palm
plantations. That's not to say they weren't already motivated,
logging companies were happy to flatten the country and ship the
valuable timbers worldwide. If you want some moral order and a few
jobs now you have to pay for it, and we here in Tasmania host one of
the culprits; Ta An, subsidising their veneer peeling operations of
supposedly regenerating sawlogs to the tune of 20 to 30 million
dollars a year. It is an odd situation when you have to pay outsiders
to take your natural resources, locals had actually been paying out
for them for decades. It is also odd that our desperation co-exists
with plenty like ….Free Energy. Used vegetable oil is a liability
for restaurants and they are happy to give it away but even if it all
went into the insatiable guts of the Cars That Eat the World it
wouldn't provide transport for very many families. And since
manufacturer's guarantees on modern diesel cars are void if you fuel
them with biodiesel, popularity has dropped off and repairs to common
rail fuel systems are exorbitant. Should you be so foolish as to try
and start such a vehicle on a freezing morning with a tankful of
coagulated biofuel the repairs may well cost more than the value of
your car.
But I use it in a little
common rail Fiesta with no problems, simply by fueling it 50/50 with
ordinary diesel in cold weather. Recently I checked the EGR valve
while working through some computer generated error messages/limp
modes etc. The EGR was pristine after 100 thousand k's on biodiesel,
no coking at all which is better than any dino powered engine I have
seen. The error message read 'Low fuel pressure stop engine
immediately' and 'Massive Fuel Leak seek help from your friendly
dealer' who charged $130 to just to read the computer, deleted fault
messages and sent my wife home with the admonition to bring it back
in if the message comes up again. I bought an interface on the net
for $40, downloaded a free Ford software program (not Ford's) and
started replacing random parts, still cheaper and far more effective
and certain than another trip to the dealer. The messages should have
read 'Change Fuel Filter'.
Naturally the reader wants
to know how much does this stuff cost to produce. It used to cost 30
cents a litre and now it is closer to 40 cents. If there was road tax
payable it wouldn't be worth your time. So it is only a freebie in
our affluent society. Everywhere else in the world people cook like
we do at home, just enough oil to grease the pot or pan and it all
disappears. In Asia biofuel is made from waste oil which costs to
obtain. After all, it could very well be cleaned and filtered and
sold back out on the streets to the food industry. Furthermore you
can burn uncatalysed clean dry vegetable oil in your vehicle, the
hitch being that you have to have a separate diesel tank as the veg.
oil tank has to be heated to 80 degrees with a heat exchanger from
the cooling system before you can shift the engine away from diesel
fuel and similarly you have to purge the pumps and lines with diesel
before you shut the motor down. And you have to do your own
mechanical work because professionals don't want to deal with sticky
and incomprehensible 'grease cars.'
The
unified processor/washer dryer during construction complete with
agitator on top. The next image is my Mark 1 processor with all the
supporting supporting gear, methoxide mixer on bottom right, wash/dry
tank and in foreground the little blue primary oil filter on left. For a
final filter I use a water filter with cleanable element.
There is no point in my
going into the details of a processing system. You can buy a new one
made of plastic for 10 thousand dollars or make it in an old
converted oil drum or discarded hot water cylinder for some hours of
your time and a few welding rods. Plans are everywhere on the net,
try Journey to Forever and Biofuels Forum is an Australian site that
will answer all your questions although it is peopled to some extent
by rank amateurs who have been sold some pup – like there might be
a shortcut that omits the water wash by throwing plaster of Paris
into the mix or a zeolite filter. Anyone who has tried unwashed bio
generally loses in the end as caustic soda is very hard on your
expensive (aluminium) injection pump, while water if not completely
removed will destroy the moving parts of case- hardened superclose
tolerance steel and there is an old appropriate adage “If it ain't
broke, don't fix it.”
This and more is published
on georgesmileyblog.blogspot.com
Best wishes
GS