![]() Reducing the amount of heating to take place can significantly improve efficiency. As nitrogen plays no part in the combustion process any heat applied to it by combustion is wasted. When considering why this is an important improvement to overall efficiency it is worth remembering that air is approximately 79% nitrogen. This pre-heating uses exhaust steam to heat all air used for combustion to high temperatures before it is used as either primary or secondary air. Included, as is normal for Porta designs, is full combustion air preheating. The cyclone throat is the opening at the top of the 'igloo' through which the combustion gases exit into the top of the firebox and thus the boiler tubes.Ĭlick here for a view of the cyclonic gas producer furnace arrangement: This view of half of the grate area is looking down on it from above the cyclone 'igloo'. The reason for this being that these types of stoker head will give the best coal distribution to the grate, far better than more traditional systems using steam jets, whilst also assisting in the creation of the correct 'wash bowl' shaped fire. In essence the ash screws are just like mechanical stoker screws operating in the reverse direction.įuel would be delivered to the grate mechanically with the final distribution likely to be a version of the Elvin or Patadon type rather than the traditional table plate and steam jet system. In fact ash screws are employed to remove ash to the 'real' ashpan situated between the bogies of the tender. To ensure the best combustion but also to aid the design in general the ashpan under the grate is very small. Also note the ash screws designed to remove ash from the ashpan keeping them clear and thus ensuring optimum performance of the Cyclonic Gas Producer furnace. It clearly shows the V-clinkering grate proposed (as trialled at Rio Turbio in the 1960s) and the extensive use of combustion air preheaters. This head-on view takes a section through the rear of the firebox. He did not accept the "normal" list of objections to the use of this valvegear. *Southern Valvegear is selected for Porta type compounds as it is a simple, heavyduty gear, it is easy to adapt to give solid, reliable transmission from the outside motion to the inside, it allows the cut off ratio between the HP, MP and LP cylinder to be easily set up and the link does not wear on each wheel revolution. Sufficient for 5 hours at 6000dbhp outputġ8m 3 (ballast weight and emergency supply) (33Kb)Ĭylinder Details: Triple Expansion Compoundīooster Details: Triple Expansion Compound, Lewty Type Click here or on the image above to open a larger version of the illustration. To allow comparison on the right is the UIC "Berne" gauge which is (to be very imprecise) the common loading gauge used in mainland Europe. The above illustration shows the AAR Plate 'C' loading gauge this locomotive is designed for. This locomotive is a development of a similar 6000hp 2-10-0, but second generation locomotive, designed by Porta during his time as the Head of Thermodynamics at the Argentine state technology institute, INTI, in 1970s. ![]() This locomotive has been referred to previously, notably by David Wardale in his book 'The Red Devil and Other Tales from the Age of Steam', however some of the material presented below has not been published previously. Third Generation, yet-to-be developed engines, the prototypes of which would ![]() It is worth repeating here Porta's definition of "steam generations": However Third Generation steam is, as the name suggests, a step chance from Second Generation, more akin to a paradigm shift than a simple uprating of the technology. It should be noted that, based on Porta's definition, Second Generation steam is capable of being built today with certainty in the outcome, no new development work is required. Some of the technology shown in this locomotive is taken from then current coal fired power station technology and suitably adapted for locomotive use. Much of the technology embodied in this 2-10-0 has only been trialled, not used in regular service whilst other parts of the design break new ground - hence the need for development. However it should be noted this machine is designated as Third Generation steam, development work would have been required to build it in the 1970s, as would still be the case today. It was drawn out to demonstrate what Porta felt was possible within the North American AAR loading gauge 'Plate C' based on then current knowledge, predictions and requirements. This 2-10-0 design dates from the 1970s first being given a public airing at the 14th Pan American Railway Congress at Lima, Peru, in November 1978. Third Generation Steam for North America - A Triple Expansion CompoundĪ 6000hp Triple Expansion Compound 2-10-0 ![]()
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