Economics of Hydrogen Production - Revision history

Trevor at 09:12, 22 November 2019

2019-11-22T09:12:51Z

Trevor at 09:09, 22 November 2019

2019-11-22T09:09:17Z

Trevor at 10:36, 27 September 2019

2019-09-27T10:36:40Z

Trevor: Created page with "Hydrogen has been proposed as carbon-free alternative fuel to hydrocarbons. The electrochemistry of producing hydrogen (and oxygen) from water using is well understood. One '..."

2019-09-27T10:25:50Z

Created page with "Hydrogen has been proposed as carbon-free alternative fuel to hydrocarbons. The electrochemistry of producing hydrogen (and oxygen) from water using is well understood. One '..."

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Hydrogen has been proposed as carbon-free alternative fuel to hydrocarbons.

The electrochemistry of producing hydrogen (and oxygen) from water using is well understood. One ''FARADAY'' (96,485 ''COULOMBS'') is required to produce one mole of hydrogen atoms - or half a mole of hydrogen molecules ( H2). Therefore an electric current of 1 ''AMP'' will in 1 ''SECOND'' produce 0.5/96485 = 5.18E-06 moles H2. Assuming a cell ''VOLTAGE'' of 1.481V that equates to 3.5E-06 moles H2 per W-s; 0.0126 moles H2 per W-h; 12.6 moles H2 per kW-h; 25.2 GRAMS H2 per kW-h. As hydrogen has a higher calorific value than natural gas (112 MJ/kg versus 50 MJ/kg) multiply by this ratio (112/50) to get 56.4g natural-gas-equivalent per kilowatt-hour electricity

How does the price of hydrogen produced from by electrolysis compare to the cost of natural gas? For electricity @ 8.8p per kW-h and natural gas @ 4.3p per kW-h, the 25.2 g H2 (= 56.4g natural-gas-equivalent) costs 8.8p and the ''actual'' cost of 56.4g natural gas (2.82 MJ; 2820 kJ; 0.784 kW-h) is 3.4p

In other words hydrogen from electricity cost about 2.6x the equivalent amount of natural gas

@@ Line 1: / Line 1: @@
 Hydrogen has been proposed as carbon-free alternative fuel to hydrocarbons provided the hydrogen is produced from a carbon-free source e.g. renewable or nuclear electricity
-The electrochemistry of producing hydrogen (and oxygen) from water using is well understood. One ''FARADAY'' (96,485 ''COULOMBS'') is required to produce one mole of hydrogen atoms - or half a mole of hydrogen molecules ( H<sub>2</sub>). Therefore an electric current of 1 ''AMP'' will in 1 ''SECOND'' produce 0.5/96485 = 5.18E-06 moles  H<sub>2</sub>. Assuming a cell ''VOLTAGE'' of 1.481V that equates to 3.5E-06 moles  H<sub>2</sub> per W-s; 0.0126 moles  H<sub>2</sub> per W-h; 12.6 moles  H<sub>2</sub> per kW-h; 25.2 ''GRAMS''  H<sub>2</sub> per kW-h. As hydrogen has a higher calorific value than natural gas (112 MJ/kg versus 50 MJ/kg) multiply by this ratio (112/50) to get 56.4g natural-gas-equivalent per kilowatt-hour electricity
+The electrochemistry of producing hydrogen (and oxygen) from water using is well understood. One ''FARADAY'' (96,485 ''COULOMBS'') is required to produce one mole of hydrogen atoms - or half a mole of hydrogen molecules (H<sub>2</sub>). Therefore an electric current of 1 ''AMP'' will in 1 ''SECOND'' produce 0.5/96485 = 5.18E-06 moles  H<sub>2</sub>. Assuming a cell ''VOLTAGE'' of 1.481V that equates to 3.5E-06 moles  H<sub>2</sub> per W-s; 0.0126 moles  H<sub>2</sub> per W-h; 12.6 moles  H<sub>2</sub> per kW-h; 25.2 ''GRAMS''  H<sub>2</sub> per kW-h. As hydrogen has a higher calorific value than natural gas (112 MJ/kg versus 50 MJ/kg) multiply by this ratio (112/50) to get 56.4g natural-gas-equivalent per kilowatt-hour electricity
 How does the price of hydrogen produced from by electrolysis compare to the cost of natural gas? For electricity @ 8.8p per kW-h and natural gas @ 4.3p per kW-h, the 25.2 g  H<sub>2</sub> (= 56.4g natural-gas-equivalent) costs 8.8p and the ''actual'' cost of 56.4g natural gas (2.82 MJ; 2820 kJ; 0.784 kW-h) is 3.4p
 In other words hydrogen from electricity costs about 2.6x the equivalent amount of natural gas

← Older revision		Revision as of 09:09, 22 November 2019
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	How does the price of hydrogen produced from by electrolysis compare to the cost of natural gas? For electricity @ 8.8p per kW-h and natural gas @ 4.3p per kW-h, the 25.2 g H<sub>2</sub> (= 56.4g natural-gas-equivalent) costs 8.8p and the ''actual'' cost of 56.4g natural gas (2.82 MJ; 2820 kJ; 0.784 kW-h) is 3.4p		How does the price of hydrogen produced from by electrolysis compare to the cost of natural gas? For electricity @ 8.8p per kW-h and natural gas @ 4.3p per kW-h, the 25.2 g H<sub>2</sub> (= 56.4g natural-gas-equivalent) costs 8.8p and the ''actual'' cost of 56.4g natural gas (2.82 MJ; 2820 kJ; 0.784 kW-h) is 3.4p

−	In other words hydrogen from electricity ~~cost~~ about 2.6x the equivalent amount of natural gas	+	In other words hydrogen from electricity costs about 2.6x the equivalent amount of natural gas

@@ Line 1: / Line 1: @@
-Hydrogen has been proposed as carbon-free alternative fuel to hydrocarbons.
+Hydrogen has been proposed as carbon-free alternative fuel to hydrocarbons provided the hydrogen is produced from a carbon-free source e.g. renewable or nuclear electricity
-The electrochemistry of producing hydrogen (and oxygen) from water using is well understood. One ''FARADAY'' (96,485 ''COULOMBS'') is required to produce one mole of hydrogen atoms - or half a mole of hydrogen molecules ( H<sub>2</sub>). Therefore an electric current of 1 ''AMP'' will in 1 ''SECOND'' produce 0.5/96485 = 5.18E-06 moles  H<sub>2</sub>. Assuming a cell ''VOLTAGE'' of 1.481V that equates to 3.5E-06 moles  H<sub>2</sub> per W-s; 0.0126 moles  H<sub>2</sub> per W-h; 12.6 moles  H<sub>2</sub> per kW-h; 25.2 GRAMS  H<sub>2</sub> per kW-h. As hydrogen has a higher calorific value than natural gas (112 MJ/kg versus 50 MJ/kg) multiply by this ratio (112/50) to get 56.4g natural-gas-equivalent per kilowatt-hour electricity
+The electrochemistry of producing hydrogen (and oxygen) from water using is well understood. One ''FARADAY'' (96,485 ''COULOMBS'') is required to produce one mole of hydrogen atoms - or half a mole of hydrogen molecules ( H<sub>2</sub>). Therefore an electric current of 1 ''AMP'' will in 1 ''SECOND'' produce 0.5/96485 = 5.18E-06 moles  H<sub>2</sub>. Assuming a cell ''VOLTAGE'' of 1.481V that equates to 3.5E-06 moles  H<sub>2</sub> per W-s; 0.0126 moles  H<sub>2</sub> per W-h; 12.6 moles  H<sub>2</sub> per kW-h; 25.2 ''GRAMS''  H<sub>2</sub> per kW-h. As hydrogen has a higher calorific value than natural gas (112 MJ/kg versus 50 MJ/kg) multiply by this ratio (112/50) to get 56.4g natural-gas-equivalent per kilowatt-hour electricity
 How does the price of hydrogen produced from by electrolysis compare to the cost of natural gas? For electricity @ 8.8p per kW-h and natural gas @ 4.3p per kW-h, the 25.2 g  H<sub>2</sub> (= 56.4g natural-gas-equivalent) costs 8.8p and the ''actual'' cost of 56.4g natural gas (2.82 MJ; 2820 kJ; 0.784 kW-h) is 3.4p
 In other words hydrogen from electricity cost about 2.6x the equivalent amount of natural gas