The issue of energy utilization from pressure reduction in hydrogen media
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As the title suggests, there is currently a stream of pure hydrogen with a flow rate of 50,000 Nm3/h, and the pressure needs to be reduced from 50 kilograms to around 20 kilograms. What are some good ways to utilize this energy? Thank you!
Can the expander be omitted? Pressure difference power generation or drive!
The expander should be a practical solution; are there practical applications for both driving and power generation? What are the advantages and disadvantages of each?
For power generation, factors such as grid synchronization and protection devices need to be taken into account; the system is complex but can operate unattended, and its operation can be adjusted according to the hydrogen load. The driving mechanism is not complicated either, but the driving load must match the expansion work, and the load needs to be adjusted accordingly, which does not guarantee an efficient use of the expansion work. Driving and power generation could also be considered; when the driving load is low, the expansion work can be used for power generation, and when the driving load is high, the expansion work still helps to save energy by preventing waste of power. Personal opinion. Please give feedback: handshake
The hydrogen expander itself is a highly mature technology; the device that is driven by it – whether it’s a generator or a compressor – depends on the actual requirements of the system. However, the idea of using one machine to drive two devices in order to achieve full utilization of energy is good, but there are many problems associated with its mechanical design and operation, including issues related to the control of rotational speeds and shaft displacement； The practical approach in reality is to use an expander with a bypass valve!