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Steam related discussions.
Re: Steam turbine driven turbojet - 2 years ago
German patent of early 1920s for a high speed propeller 1000 hp steam turbine airboat with the air cooled steam condenser (Luftkondensation bei dampfbetriebenen Schnellbooten) https://worldwide.espacenet.com/patent/search/family/006220661/publication/DE336702C?q=Dampfantrieb%20luft 1928 Steam powered vertical takeoff helicopter/drone. https://worldwide.espacenet.com/patent/search/familyby novice - SteamStuff
Re: Steam turbine driven turbojet - 2 years ago
Steam turbine assisted aircraft turbojet engines patents: GB2334556A United Kingdom Turbojet with steam turbine https://patentimages.storage.googleapis.com/a5/f7/61/f444a9f2272cce/GB2334556A.pdf Abstract The Thermo Induction Turbojet operates by drawing in air and compressing it in an axial flow compressor 1. Front here it is passed into combustion chamber 6 where it is mixed with fueby novice - SteamStuff
Re: Full Steam Proposal for Auto Mfrs - 3 years ago
novice Wrote: ------------------------------------------------------- > Internal combustion engine has some potential for > efficiency improvement. > Spark ignition gasoline engine can potentially > reach 50% net efficiency and turbodiesel - up to > 60%. > > https://www.sae.org/news/2019/04/high-efficiency-i > c-engines-symposium-2019-delphi-gdci-engine > httby novice - SteamStuff
Re: Full Steam Proposal for Auto Mfrs - 3 years ago
Internal combustion engine has some potential for efficiency improvement. Spark ignition gasoline engine can potentially reach 50% net efficiency and turbodiesel - up to 60%. https://www.sae.org/news/2019/04/high-efficiency-ic-engines-symposium-2019-delphi-gdci-engine https://www.roadandtrack.com/new-cars/car-technology/a19909520/gas-diesel-engine-reactivity-controlled-compression-ignition/by novice - SteamStuff
Re: Full Steam Proposal for Auto Mfrs - 3 years ago
Another example of a novel drive system that failed to be commercialized. Australian underground rescue tractor with the closed cycle gas turbine propulsion powerplant based on 316 hp converted helicopter engine T63-A700 with hydrostatic transmission and an electrically heated 1000kWh 10000 lbs molten sodium fluoride salt energy storage. 150 kw electric heaters melt salt at 1818F in 7 hours. Neby novice - SteamStuff
Re: Full Steam Proposal for Auto Mfrs - 3 years ago
Coal dust fired gas turbine Oldsmobile Delta 88: https://youtu.be/0CAN5nO1ag0 There is no high pressure boiler and no main cooling radiator, except small one for the lubricating oil. Disadvantage is that coal ash is not good for the turbine. Indirectly fired air heat exhanger can eliminate this problem.by novice - SteamStuff
Re: Full Steam Proposal for Auto Mfrs - 3 years ago
Steam automotive projects of 1970s: https://books.google.com/books/about/An_assessment_of_the_technology_of_Ranki.html?id=ru8wawEoBYsC Drawings show that steam automotive powerplants have larger volume that equivalent IC engines. Also steam powered automobiles probably won't pass crash testing.by novice - SteamStuff
Re: Full Steam Proposal for Auto Mfrs - 3 years ago
Steam automotive engine has almost no chances to be implemented unless there is compact unlimited source of thermal energy, such as cold fusion. There are a lot of places in tropical and subtropical regions where there is a demand for sustainable air conditioning. Solar powered Rankine cycle air conditioner may be a solution to this problem. A review of solar thermo-mechanical refrigeraby novice - SteamStuff
Re: Full Steam Proposal for Auto Mfrs - 3 years ago
Search in Google Patents shows that many "new" ideas had been invented at least once many decades ago. Heat storage system utilized in heat engine drive system: "A `heat battery` or heat storage device based on the phenomena that at a particular temperature and pressure water becomes supercritical and can absorb increasing quantities of heat without a corresponding increase inby novice - SteamStuff
Re: Full Steam Proposal for Auto Mfrs - 3 years ago
Steam automotive powerplants were not promising innovation in 1945. Report "A PROGRESS REPORT ON THE AGRICULTURAL TESTS WITH THE BESLER AEROSOL by H. E. Morrison and W . Rasmussen" describes testing results of a steam generator from the Besler steam car and steam aircraft that was converted into an agricultural insecticide aerosol generator: http://ir.library.oregonstate.edu/by novice - SteamStuff
Re: Full Steam Proposal for Auto Mfrs - 3 years ago
http://www.newsteamengine.com/section01.htm A Compact Pollution-Free External Combustion Engine with High Part-Load Efficiency. Another example of supercritical steam automotive powerplant.by novice - SteamStuff
Re: Electric batch boiler - 3 years ago
Swiss steam locomotive with electric water boiling. http://www.douglas-self.com/MUSEUM/LOCOLOCO/swisselec/swisselc.htm "Power was taken at 15 kV, 16.6 Hz from overhead lines by a pantograph, and fed to resistance heating elements in the boiler, via two transformers rated together at 480 kW. Water feed was by normal steam injectors. These unique locomotives also retained the capabilitby novice - SteamStuff
Re: Steam turbine driven turbojet - 3 years ago
Some of the water jet washers have working pressure of 5000 psi or higher. At high water temperatures 1000-1500F the piping and steam turbine have to be made from a high strength high temperature nickel chromium steel alloy. In early 1950s there was a concept of a jet aircraft with the two 49000 hp supercritical 5000psi/1000F steam turbines driving two ducted fans that were pushing compressed airby novice - SteamStuff
Re: Full Steam Proposal for Auto Mfrs - 3 years ago
There were many proposals by individuals and small companies to mass produce steam powered passenger vehicles. They all did fail short of their goals. Private business is interested in new product if there are proven market demand, working certified prototype, proven sales and fast return on investment. Without this no one will give away possibly many millions of dollars on experimental idea. Itby novice - SteamStuff
Re: Steam turbine driven turbojet - 3 years ago
Liquid metals(molten sodium, potassium and mercury) and high boiling temperature organic liquids were also studied for closed Rankine cycle aerial vehicles propulsion. https://archive.org/download/DTIC_AD0864962/DTIC_AD0864962.pdf A study of various advanced powerplants for a large helicopter: Closed Brayton cycle gas turbine (heavy oil fuel, coal, boron, metals) Potassium metal closed Ranby novice - SteamStuff
Great old books on steam engines construction - 3 years ago
Late 19th-early 20th century books on steam engine construction: Model aeroplanes and their engines; a practical book for beginners by Cavanagh, George Anthony, 1894- Publication date 1917 https://archive.org/download/modelaeroplanest00cava/modelaeroplanest00cava.pdf The Model Engineer's Handybook: A Practical Manual on Model Steam Engines ... by Paul Nooncree Hasluck Pubby novice - SteamStuff
Re: Electric batch boiler - 3 years ago
Two interesting PhD works: Feasibility of using a steam power system in a small garden tractor: https://scholarsmine.mst.edu/cgi/viewcontent.cgi?article=6064&context=masters_theses Steam sports car design: https://pdfs.semanticscholar.org/09be/3652f06da5b59e157273cd8488b184dedf4f.pdfby novice - SteamStuff
Re: P fired boilers - 3 years ago
In 1930s Nathan Price proposed design of a turbocharged steam generator for an aircraft with 5000 hp steam turbine driven propeller. In theory its power was constant all the way up to 45,000 ft, despite air density only 20% of sea level. Air was compressed by a turbocharger to 35 psi. Calcilated weight of this generator with water was just 1800 lbs https://patentimages.storage.googleapis.com/0by novice - SteamStuff
Re: Economics of advanced condensing steam locomotive - 3 years ago
There were also projects of converting diesel locomotive engines to run directly on pulverized coal dust or ultrafine coal-water slurry. Main issue is fast wear of engine parts by abrasive coal and ash particles and corrosion by sulfur dioxide. There is also other problem of coal locomotives - hot particles of ash and unburned coal must be cooled down to prevent fires: https://www.rtands.comby novice - SteamStuff
Re: Economics of advanced condensing steam locomotive - 3 years ago
Electrification of existing railroads is not cheap. Large number of powerlines, substations have to be build along with 1000s of miles of contact wires and supporting structures. Return on Capital investments will be decades which is not what private companies expect. If coal-water slurry is used it is possible to use the cheapest sorts of coal and transport it via pipelines. https://www.eesby novice - SteamStuff
Economics of advanced condensing steam locomotive - 3 years ago
Coal is much cheaper per Btu of energy than diesel fuel or gasoline. It has a lot of sulfur and ash, that have to be neutralized and stored, but this is done routinely in power generation stations and can be applied to locomotives too. If advanced steam turbine closed cycle condensing locomotive will reach 20%-25% efficiency, the fuel expenses can be decreased 5-10 times depending on sort of cby novice - SteamStuff
Re: Electric batch boiler - 3 years ago
Renewable energy can be used to produce high pressure hydrogen and oxygen from water in ultrahigh pressure (12000 psi) electrolyzer. Hydrogen can be stored in gaseous form in 35 gallons 10000 psi composite tank or liquified and stored in cryogenic tank. Hydrogen can be used either in internal combustion engine or in ultrahigh temperature steam turbine. 10000 psi vessel that weighs 100 lbs can sby novice - SteamStuff
Re: Electric batch boiler - 3 years ago
This idea is over 100 years old. It is not suitable for road automobiles but can be useful and economical at industrial facilities. http://www.dlm-ag.ch/en/stationary-ref Car driven by high pressure hot water: https://www.youtube.com/watch?v=HrZJsvDy19I It's not fast, does not go far, and can't be used on highways. But it uses cheap/free energy source.by novice - SteamStuff
Steam locomotive and aircraft engines with mechanical steam recompression - 3 years ago
Several engineers designed steam powerplants with a mechanical recompression of exhaust steam. http://www.douglas-self.com/MUSEUM/LOCOLOCO/compsteam/compsteam.htm " ... The Paragon-Cristiani Compressed Steam System was a Diesel-steam hybrid that used the steam for power transmission rather than power generation. The actual prime mover was intended to be a Diesel engine. It was based onby novice - SteamStuff
Compact rotary steam engine for an automobile - 3 years ago
A power plant for driving road vehicles, comprising a rotating evaporator, an expansion engine driven by a vaporizable working fluid, a rotating condenser and a source of heat. https://patentimages.storage.googleapis.com/d5/a5/94/7c997d157dd44b/US4004426.pdf This is not a new idea. Similar steam powerplants were proposed for the aircrafts in early 20th century. Steam generating system forby novice - SteamStuff
Re: Thermochemical water splitting and oxy-hydrogen steam turbine - 3 years ago
Water splitting process efficiency is 40-50%, lower than water electrolysis 70-80%. But because electric energy is usually produced with efficiency 20-40%, thermochemical process is 2-3 times more efficient. Main application of this technology is solar steam power stations. Solar energy powered metal oxide catalytic generator splits water into oxygen and hydrogen. These gases can be easily storby novice - SteamStuff
Thermochemical water splitting and oxy-hydrogen steam turbine - 3 years ago
Traditional steam generators are heavy and bulky. Metal pipes have to work in high pressure and temperature environment. Efficiency of the steam powerplant is limited by maximum temperature of the steam from steam generator. This temperature usually is around 1000-1100F and in certain conditions can be up to 1500F: High performance steam development. Final report, Phase No. 3: 1500{degree}F sby novice - SteamStuff
Re: Steam Powered Tank - 3 years ago
Yuba steam turbine air cooled condensing powerplant study for the M-48 Tank. Steam generator pressure- 5000 psi, temperature -1200F; Exhaust steam 20 psi at full power, 5.3 psi -cruise power. Theoretical efficiency-39.6%. Fuel - coal, heavy oil, wood. Evaluation of the Yuba steam-engine power plant Keeler, Hugh Edward, 1954 https://deepblue.lib.umich.edu/bitstream/handle/2027.42/5922by novice - SteamStuff
Supercritical CO2 rankine turbine engine for aircraft/automobile - 3 years ago
Interesting concept of compact and highly efficient closed Rankine cycle engine with supercritical carbon dioxide instead of water. Main application is very high altitude aircraft, but it can be also used for automotive propulsion. Supercritical carbon dioxide is much denser than steam which is allowing very power dense turbomachinery. Using scroll expander is advantageous for small engines, becby novice - SteamStuff
Re: Seeking advice regarding turbocharging monotube boiler. - 3 years ago
Turbocharged steam generators were originally proposed for aircraft powerplants. The best designs had weight of 0.35 lbs for 1 hp. In steam automobiles turbocharged steam generators can help to boost average powerplant net efficiency from 15% to 20-25% by providing power to steam condenser fan, boiler water pump, air conditioner and other auxiliaries from gas turbocharger.by novice - SteamStuff