Hydrogen Economy Now 7

Enhanced Hydrogen Generation Using Printed Circuit Heat Exchangers When CH4 supplies the heat of reaction Mohideen Ibramsha 1968 Alumni of Thiagarajar College of Engineering, Madurai, TN, India 1974 intellectual son of PhD guide Prof. V.Rajaraman & Mrs. Dharma Rajaramn, CS, EE, IIT, Kanpur, UP, India 1991 First HOD of CSE, CEC [now BSAU] Chennai, TN, India Associate Professor (Retd), Computer Science, Framingham, MA, USA Consultant R&D, M A M College of Engineering, Trichy, TN, India Advisor, HyDIGIT Pte Ltd, Singapore Email: ibramsha7@yahoo.com

This article was posted elsewhere on Wednesday, June 06, 2018 - 10:05 am. It is re-posted here without changing the contents. Introduction: In https://mohideenibramsha7.wixsite.com/website/single-post/2018/08/08/Hydrogen-Economy-Now-6 we found that supplying the ‘heat of reaction’ by Hydrogen yields 0.3865 Kg of Hydrogen for every Kg of Methane. Here we consider the Hydrogen yield when the ‘heat of reaction’ is supplied by Methane. Heat of reaction: The heat of reaction for CH4 + 2H2O ‘giving’ CO2 + 4H2 is given as 29% of the energy (HHV) of CH4 in http://inside.mines.edu/~jjechura/EnergyTech/07_Hydrogen_from_SMR.pdf . In view of this fact, we have the following equations. Equations of reaction: The main SMR equation is CH4 + 2H2O ‘gives’ CO2 + 4H2. In words, 16 Kg of Methane and 36 Kg of steam produce 44 Kg of CO2 and 8 Kg of Hydrogen. The ‘heat of reaction’ is given by CH4 + 2O2 ‘giving’ CO2 + 2H2O. Since 29% of Methane is the ‘heat of reaction’ we write this equation as 0.29 CH4 + 0.29 x 2 H2O ‘ gives’ 0.29 CO2 + 0.29 x 2 H2O. The total Methane used is 1.29 CH4, corresponding to 1.29 x 16 Kg of Methane. The total Hydrogen produced is 8 Kg. Thus we get 8/(1.29 x 16) Kg of Hydrogen for every Kg of Methane. That is, 0.3876 Kg of Hydrogen for every Kg of Methane. Conclusion: Using Hydrogen to supply the ‘heat of reaction’ produced 0.3865 Kg of Hydrogen for every Kg of Methane. Methane as the fuel for the ‘heat of reaction’ gives 0.3876 Kg of Hydrogen for every Kg of Methane which is 100.28% of 0.3865. Instead of working out the actual amount of Hydrogen produced when X% of the ‘heat of reaction’ is from Hydrogen and (100 - X)% is from Methane which might be 0.3876 – ((X/100) x 0.0013) Kg of Hydrogen per one Kg of Methane, we treat the Hydrogen produced to be 0.3865 Kg of Hydrogen per one Kg of Methane irrespective of whether Hydrogen alone, or Methane alone, or a mix of Hydrogen and Methane is used to supply the ‘heat of reaction.’

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