To meet varying hydrogen-consumption patterns, McPhy suggests combining a hydrogen generator with storage capacity to optimize investment in the hydrogen solution.
Below are examples of irregular consumption patterns where combining hydrogen storage with a hydrogen generator can achieve economic optimization.
Business case 1: An industrial operator using hydrogen in a batch process
Consider a batch production process running every 14 hours at 100 Nm3/h, 5 days/7 and not working the rest of the time (10 hours/day on weekdays and all weekend).
Two solutions are available to the manufacturer to meet the on-site hydrogen production requirement:
- Invest in a 100 Nm3/h electrolyzer that operates at nominal speed/rated capacity during batch production and is stopped for the rest of the time. This represents a relatively high CAPEX for the total duration of limited use (3,500 hours per year).
- Opting for a McPhy integrated solution that will provide 100 Nm3/h in combined mode (electrolyzer + storage) during batch production sessions and which will regenerate its hydrogen stock during non-production time. This allows for a lower initial investment cost and continuous operation of the electrolyzer at its nominal flow-rate (see diagram).
Business case 2: An industrial operator with wide-ranging differences in consumption between average and maximum hydrogen flow
As in the first business case, the manufacturer has two options for its on-site hydrogen production:
- He can invest in an oversized electrolyzer to be able to meet consumption peaks. However most of the time the equipment will operate well below its maximum capacity.
- Or he can choose an integrated McPhy solution that allows him to meet greatest peak demand while using an electrolyzer with a lower nominal flow-rate than in the first solution proposed, and therefore closer to the average nominal flow-rate of hydrogen consumed. The hydrogen stock is regenerated during production cuts or shutdowns (see diagram).