CO2-CO-H2-CH4-CH2 edited

CO2-CO-H2-CH4-CH2 edited Author: David Judbarovski, systems engineering, principle inventor, retired. judbarovski.blogspot.com, davidjud.blogspot.com, 1939dmj@gmail.com. judbarovski@gmail.com . Abstract idealized. (a) CO2 splitting = CO – 283 KJ, here CO2 cycled, CO = 286,000 * 0.004 /3.6/28 = USD 11.35/ton CO. (b) CO + H2O = CO2 + H2 – 3 KJ, negligible, so H2 = 11.35 * 28 / 2 = USD 160 /ton H2. (c) CO2 from the air + 3 H2 (+H2 from CH4 = CH2 + H2) = CH4 + 254 KJ, so CH4 = (44 * 1144 kwh/ton CO2 * 0.004 + 6 * 160) /16 = USD 72.5 /ton CH4. Minus heat in electricity (254,000 /3.6/16) * 0.25 energy efficiency * USD 0.05/kwh local tariff = USD 55 /ton CH4 sold electricity, so CH4 = 72.5 – 55 = USD 17.5/ton CH4. CH2 = 17.5 * 16 / 14 = USD 20.0/ ton CH2 = USD 2.85/bbl. And more realistic = idealized + 100 %. CO = USD 22.7/ton, H2 = USD 320, CH4 = (44 * 1.144 * 4 + 6 * 320) /16 = USD (132 – 55) /ton = USD 77 /ton = USD 55/1000 m3. CH2 = 77 * 16 / 14 = 88 = USD 12.6/bbl. Such fuels are carbon-neutral. References

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