{ "title": "Plasmatron Fuel Reformer", "inventor_name": "Alexander Rabinovich et al.", "publication_year": null, "device_name": "Plasmatron Fuel Reformer", "goal": "Generate hydrogen-rich gas onboard vehicles to reduce emissions and improve engine efficiency.", "problem_addressed": "High NOx, CO and hydrocarbon emissions from internal-combustion engines using conventional hydrocarbon fuels.", "concept_summary": "A compact, electrically heated plasma (plasmatron) converts hydrocarbon fuels (gasoline, diesel, bio-fuels, etc.) into a hydrogen-rich gas (H_2/CO mixture). The plasma is generated by a gliding-arc or glow-discharge electrode system powered by electricity from a generator driven by the engine. The hydrogen-rich gas can replace or augment the fuel in the engine, allowing very lean combustion and large reductions in pollutants. The system is designed for rapid on-demand operation, low power consumption (~=3-5 % of fuel heating value), and scalability to industrial power levels (10-15 kW).", "detailed_description": null, "category": "Mechanical Engineering", "principles": [ "Electrical discharge plasma heating", "Non-thermal gliding-arc plasma", "Partial oxidation of hydrocarbons", "Rapid response to electrical input", "Catalytic effect of plasma-generated active species" ], "scientific_domains": [ "Plasma physics", "Chemical engineering", "Mechanical engineering", "Energy systems" ], "mechanisms_of_action": [ "High-energy electrons from the discharge break C-H bonds in the fuel", "Ionized species promote partial oxidation, yielding H_2 and CO", "Rapid heating of the gas stream creates a volumetric plasma discharge", "Generated syngas is fed directly to the combustion chamber" ], "materials": [ "Tungsten alloy electrodes", "Hafnium metal", "Lanthanated tungsten alloy", "Ceramic insulators", "Metal housing and flow channels" ], "energy_sources": [ "Electrical energy supplied by an engine-driven generator" ], "inputs": [ "Hydrocarbon fuel (gasoline, diesel, bio-fuels, ethanol, methanol, JP-4, natural gas)", "Air or oxygen", "Steam / water (for some configurations)" ], "outputs": [ "Hydrogen-rich gas (H_2, CO, small amounts of CO_2)", "Reduced exhaust emissions (NOx, CO, HC)" ], "claimed_performance": "NOx reduction by a factor of 10-100; hydrogen content of syngas up to 25-27 % vol; specific energy requirement 0.25 kW*h/m^3 of syngas; power consumption <5 % of fuel heating value; response time <=1 s.", "experimental_evidence": "Preliminary laboratory tests on gasoline, diesel, iso-octane and bio-fuels showed hydrogen-rich gas production; scaling up of gliding-arc plasmatrons to 10-15 kW demonstrated efficient syngas generation from methane and biomass; electrode erosion tests identified lanthanated tungsten alloy as superior to hafnium.", "replication_status": null, "keywords": [ "plasmatron", "hydrogen generation", "vehicle emissions", "gliding arc", "non-thermal plasma", "fuel reforming", "syngas" ], "related_technologies": [ "Internal combustion engine", "Catalytic converter", "Plasma torch", "Fuel cell (as downstream use of H_2)", "Rapid-response plasma power supplies" ], "controversy_level": "low", "confidence_score": 0.85, "practicability_score": 0.7, "fringe_score": 0.2, "evidence_strength": 0.6, "risk_score": 0.2, "trl_estimate": 5, "source_urls": [ "http://rexresearch.com/", "http://rexresearch1.com/", "https://dspace.mit.edu/handle/1721.1/94158", "https://www.sciencedirect.com/science/article/abs/pii/S0360319998000135", "https://trid.trb.org/view/481296", "https://www.inderscienceonline.com/doi/abs/10.1504/IJVD.1994.061858", "https://par.nsf.gov/servlets/purl/10313082", "https://www.researchgate.net/publication/255220693_Low_current_plasmatron_fuel_converter_having_enlarged_volume_discharges", "https://onlinelibrary.wiley.com/doi/abs/10.1002/ppap.201800159", "https://www.mdpi.com/1996-1073/15/3/1071", "https://www.dl.begellhouse.com/journals/5a5b4a3d419387fb,25266a5313ab0f35,45d0685f58ea04a0.html" ], "organizations": [ "MIT", "Inderscience Publishers", "NASA (via NSF report)", "University of California (Shenoy et al.)" ], "applications": [ "On-board hydrogen production for low-emission vehicles", "Industrial syngas generation from natural gas, coal, biomass", "Rapid-response fuel processing for engine start-up" ], "limitations": [ "Electrode lifetime and erosion under high-temperature plasma", "Energy penalty of powering the plasma (must be offset by efficiency gains)", "Complex control of gas composition and flow rates", "Scaling from laboratory prototypes to commercial power levels" ], "open_questions": [ "Optimal electrode material and geometry for long-term durability", "Precise energy balance when integrated with a real vehicle drivetrain", "Cost-benefit analysis compared with alternative low-emission technologies", "Control strategies for maintaining desired H_2/CO ratios under varying load" ], "red_flags": [ "Performance claims (e.g., NOx reduction factor 100) are based on limited laboratory data", "No independent third-party replication reported", "Potential for overstatement of overall vehicle efficiency gains" ], "evidence_quotes": [ "Preliminary experimental studies of plasmatron conversion of difficult-to-use alternative fuels (biofuels), iso-octane (representative of gasoline), and diesel fuel are described.", "Key feasibility issues that must be investigated include plasmatron energy requirements, purity of plasmatron-generated hydrogen-rich gas and plasmatron electrode lifetime.", "The gliding-arc discharge was demonstrated at power level 2-3 kW and proved to be a highly efficient plasma stimulant of several plasma chemical processes, including hydrogen/syngas generation from biomass, coal and organic wastes.", "Experimental results showed that hydrogen was the highest proportion of the produced syngas; lanthanated tungsten alloy displayed higher erosion resistance than hafnium metal.", "NOx levels could be reduced by factors of 10 to 100." ] }