How to reduce the amount of circulating hydrogen?
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Many posts talk about how to improve things, but what if the amount of recycled hydrogen is too high? How can it be reduced? Improve hydrogen purity? Reduce total pressure?
The simplest approach is to shut off the hydrogen inlet, use venting to release gas, and employ a compressor to maintain pressure
Reduce the amount of new hydrogen supplied, or lower the speed of the hydrogen circulation pump
1. When the pressure is reduced, the amount of naturally circulating hydrogen also decreases; it is necessary to check whether the product still meets the requirements, and this approach is generally not recommended! 2. Increasing the amount of hydrogen returned will certainly lead to a decrease in the amount of circulating hydrogen, but this has little significance. Reducing the amount of circulating hydrogen while keeping the compressor load unchanged likely does not align with the original intention of the poster! 3. Adding a stepless adjustment system is definitely a good idea! However, the investment in stepless variable speed systems is high, domestic brands have technical shortcomings, and among foreign brands, only Holberg and Delaisy are decent! Since the difference between the original design and the actual requirements isn’t very large, this solution isn’t that good either! 4. Install a frequency conversion control system; domestic brands of high-voltage frequency converters are now of satisfactory quality, so they should be given priority consideration. The investment required is relatively low, and such systems offer excellent economic benefits as well as ease of operation! 5. If the deviation between the actual amount and the required amount is not too large, it is not recommended to make any adjustments, as a higher volume of recycled hydrogen will have no other negative effects apart from impacting energy consumption (since the deviation should not be a multiple). The above are merely my personal opinions for reference only!
It is a centrifugal compressor; its speed has been reduced to the minimum level of 8300, and the anti-surge setting has been set to 12, yet these measures still do not meet the requirements. Moreover, activating the anti-surge function increases energy consumption, which is a last-resort solution. Are there any effective measures available to address the issue of excessive circulating hydrogen volume?
Reduce system pressure, increase hydrogen purity, and raise compressor inlet temperature
The purity of the recycled hydrogen is too low, resulting in an excessive amount of recycled hydrogen. The problem should be addressed by starting with the raw materials (oil products, hydrogen supply), or by releasing some of the waste hydrogen
1. Improve hydrogen purity 2. Discharge waste hydrogen 3. Reduce the speed of the circulation compressor 4. Temperature after high-pressure cooling 5. System pressure