Re: BBC - Eurotunnel cuts rail freight cost


"Michael Bell" <michael@xxxxxxxxxxxxxxxx> wrote in message
news:e82ebd364f.michaelbell@xxxxxxxxxxxxxxxxxxxxxxxxxxx
In message <vatth3hovgtvfo7eb1plqu7bp7fuhu2qe4@xxxxxxx>
The Good Doctor <nospam@xxxxxxxxxxxxxx> wrote:

Theo Markettos <theom+news@xxxxxxxxxxxxxxxxxxxxxx> wrote:

The Good Doctor <nospam@xxxxxxxxxxxxxx> wrote:
Yet because of the colossal volumes of freight moved by sea, it is a
very large contributor to CO2 emissions - worldwide, about double that
of aviation.

Is that because they burn any old rubbish as fuel oil, being under no
national jurisdiction forcing them to run clean or efficient engines?


As oil is the largest element of shipping costs, I would have thought
that shipping companies would be under enormous pressure to burn as
little of it as possible, consistent with meeting schedules.

It's the last bit that does the CO2 damage, as fuel consumption
increases much more than linearly with increases in speed.

Speed at sea is ultimately set by the wave-making limit. If the wave
set up by the ship's movement is longer than the ship's own length,
then the ship is effectively climbing a hill; the bow is higher than
the stern. Beyond that it is more economical to plane - VERY
energy-consuming!

The reason for using "dirty" oil is cost. I don't know if there would
be another market for some of the fractions that are included in
bunker oils. I suspect not, so burning them in ship's engines might
be the least worst method of disposal.

Indeed so. The dregs come with the oil. If they can't be used usefully
out at sea, then they have to be disposed of as waste, and that might
be really difficult. As a flyer, I wonder if they might be best
disposed of in a sewerage plant? But they would still release CO2, and
we would get no energy from it.

Michael Bell



--
They're also used in power stations and industrial boilers, where they have
to be heated to render them viscous enough to flow into the injectors. I
recollect them, and the residue from waste lubricating reprocessing, being
used in the plant supply boilers of a place I worked at on the appropriately
named Smoke Lane in Avonmouth. The problem was that they contained enough
abrasive material that the lifetime of the injectors was pretty short.
Another use, I believe, is to provide carbon black which is used to colour
car tyres.
Brian


.

Relevant Pages

  • Re: BBC - Eurotunnel cuts rail freight cost
    ... very large contributor to CO2 emissions - worldwide, ... Is that because they burn any old rubbish as fuel oil, ... The dregs come with the oil. ...
    (uk.railway)
  • Re: BBC - Eurotunnel cuts rail freight cost
    ... very large contributor to CO2 emissions - worldwide, ... Is that because they burn any old rubbish as fuel oil, ... The dregs come with the oil. ... This oil in the past was used for burning in some steam locomotives, and had the interesting side effect to complicate the starting proceedure, because the oil was steam heated to make it flow to the burner. ...
    (uk.railway)
  • Re: BBC - Eurotunnel cuts rail freight cost
    ... very large contributor to CO2 emissions - worldwide, ... Is that because they burn any old rubbish as fuel oil, ...
    (uk.railway)
  • Re: Oil on rough seas
    ... The oil would burn. ... How long would it burn. ... set fire to it - so the damage to coastal birds and marine life was ... Certain chemicals cause it to be heavier then water and sinking it can suffocate any fires. ...
    (sci.military.naval)
  • Re: Oil on rough seas
    ... The oil would burn. ... How long would it burn. ... set fire to it - so the damage to coastal birds and marine life was ... Destroyers sunk in battle have fuel burning for days. ...
    (sci.military.naval)