Abstract
Power to gas (PtG) capitalizes on the free or low-cost power made available during frequent mismatches between power demand and power supply by converting water into hydrogen and oxygen via electrolysis. Current PtG projects vent the oxygen to the atmosphere and utilize the hydrogen for myriad purposes. Although oxygen has relatively little value when compared to hydrogen on a mass basis, the value of oxygen produced via electrolysis is significant compared to the value of the hydrogen due to the composition of water. This work presents a systematic methodology for designing a PtG project which co-utilizes hydrogen and oxygen to manufacture hydrogen and chemicals via integration with the natural gas infrastructure. A case study is developed and solved to demonstrate the applicability of the proposed methodology. The results of the case study show that significant value may be added by utilizing oxygen and the natural gas infrastructure.
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Abbreviations
- h :
-
Hours of the day, h ∈ (1…24)
- i :
-
Probability interval i ∈ (1..8)
- j :
-
Sinksj ∈ (1. . Nsinks)
- s :
-
Seasons s ∈ (winter, spring, summer, fall)
- \( {C}_j^{{\mathrm{H}}_2,\mathrm{logistics}} \) :
-
Hydrogen transportation costs ($/kg)
- \( {C}_j^{{\mathrm{O}}_2,\mathrm{logistics}} \) :
-
Oxygen transportation costs ($/kg)
- \( {F}_j^{{\mathrm{H}}_2,\max } \) :
-
Hydrogen demand (kg/time)
- \( {F}_j^{{\mathrm{O}}_2,\max } \) :
-
Oxygen demand (kg/time)
- \( {\mathrm{G}}_{s,h}^{\mathrm{max}} \) :
-
Natural gas max withdrawal rate (kg/time)
- LBi :
-
Lower bound of interval i
- LBi, s, h :
-
Lower bound of interval i during hour h of season s
- M i :
-
Median of interval i
- \( {N}_s^{\mathrm{days}} \) :
-
Number of days in each season
- p i :
-
Probability that a random variable falls in interval i
- \( {P}_{s,h}^{\mathrm{available}} \) :
-
Available power rate during hour h of season s
- \( {P}_j^{{\mathrm{H}}_2} \) :
-
Hydrogen price ($/kg)
- \( {P}_j^{{\mathrm{O}}_2} \) :
-
Oxygen price ($/kg)
- T s, h :
-
Average fraction of an hour that power is available during hour h of season s
- UBi :
-
Upper bound of interval i
- UBi, s, h :
-
Upper bound of interval i during hour h of season s
- \( {\varPsi}_{s,h}^{\mathrm{power}} \) :
-
Price of power during hour h if season s ($/MWh)
- \( {C}_{{\mathrm{H}}_2}^{\mathrm{production}}E \) :
-
Size of the electrolyzer (kW)
- \( {F}_j^{{\mathrm{H}}_2} \) :
-
Hydrogen produced for user j (kg/time)
- \( {F}_j^{{\mathrm{O}}_2} \) :
-
Oxygen produced for user j (kg/time)
- \( {F}_{{\mathrm{H}}_2}^{\mathrm{total}} \) :
-
Total annual hydrogen production (kg/year)
- \( {F}_{{\mathrm{O}}_2}^{\mathrm{total}} \) :
-
Total annual oxygen production (kg/year)
- O & M :
-
Annual operations and maintenance costs ($/year)
- P utilized :
-
Annual power utilized by electrolyzer (MWh/year)
- \( {R}^{{\mathrm{H}}_2} \) :
-
Total annual revenue from hydrogen sales ($/year)
- \( {R}^{{\mathrm{O}}_2} \) :
-
Total annual revenue from oxygen sales ($/year)
- \( \mathrm{RO}{\mathrm{I}}^{{\mathrm{H}}_2} \) :
-
Return on investment from H2 only sales scenario (%)
- \( \mathrm{RO}{\mathrm{I}}^{{\mathrm{H}}_2+{\mathrm{O}}_2} \) :
-
Return on investment from H2 + O2 sales scenario (%)
- TAC:
-
Total annual cost ($/year)
- U h, s :
-
Hourly capacity utilization (%)
- U total :
-
Average annual capacity utilization rate (%)
- \( {\Pi}^{{\mathrm{H}}_2} \) :
-
Profit from H2 only scenario ($/year)
- \( {\Pi}^{{\mathrm{H}}_2+{\mathrm{O}}_2} \) :
-
Profit from H2+O2 sales scenario ($/year)
- Φ(D, O):
-
Total annual cost ($/year)
- CHOSYN:
-
Carbon–Hydrogen–Oxygen Symbiosis Network
- CO2 :
-
Carbon dioxide
- EIP:
-
Eco-Industrial Park
- FCEV:
-
Fuel cell electric vehicle
- H2 :
-
Molecular hydrogen
- O2 :
-
Molecular oxygen
- PtG:
-
Power to gas
- ROI:
-
Return on investment
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Panu, M., Zhang, C., El-Halwagi, M.M. et al. Integration of Excess Renewable Energy with Natural Gas Infrastructure for the Production of Hydrogen and Chemicals. Process Integr Optim Sustain 5, 487–504 (2021). https://doi.org/10.1007/s41660-021-00158-7
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DOI: https://doi.org/10.1007/s41660-021-00158-7