A liquid-driven compressor is a type of compressor that uses a liquid as its power source to compress gas. It typically consists of a chamber containing a liquid, such as water or oil, and a compressor unit that is driven by the pressure generated by the liquid.
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They are often used for hydrogen refueling stations, where they can compress hydrogen gas to high pressures for storage in tanks or for refueling fuel cell vehicles. They can also be used in hydrogen production facilities, where they compress the hydrogen gas produced by electrolysis or other methods for storage or transportation. In addition, liquid-driven compressors can be used for other industrial gases, such as nitrogen, oxygen, and argon
Hydrogen is a remarkable element with many unique properties that make it an ideal energy carrier. Due to its low density at atmospheric conditions (90 g/m³), some form of compression is necessary. For comparison, natural gas is 8.5 times denser than hydrogen. Hydrogen compression is vital for applications such as transportation and storage.
Various refrigeration techniques may also be employed. This includes cryogenic cooling where subcooling units convert compressed, gaseous hydrogen into a liquid. By reducing the ambient air temperature below freezing, easy delivery of hydrogen is possible. While high-pressure hydrogen storage is preferred for use applications, liquid hydrogen is more efficient for large-volume transport.
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The NASH liquid ring compressor is simple with only one moving part that is a rugged, balanced rotor requiring no internal lubrication. A rotating ring of liquid compressant does what sliding vanes or pistons do in other compressors. Understanding how each method works can help determine best practices depending on specific application needs.
The role of hydrogen in the global energy landscape is growing rapidly. More blue and green hydrogen are becoming available for applications such as mobility, power generation, and energy storage. Environmentally friendly technologies such as hydrogen fuel cells and production electrolysis are also becoming more common. As a result, compressors are poised to be the technology for the safe and economical transport of hydrogen across the value chain.
NASH contributes to these technologies with our products that will reduce greenhouse gases. We have developed energy-optimized and reliable products ideal for the direct compression of wet hydrogen. We can provide two-stage arrangements up to pressures of 8 bar and without pulsation. Our single-stage compressors can handle capacities of more than 20,000 m³/h. Large capacities reduce the number of compressors in large-scale industrial electrolyzers, as well as the overall footprint and investment cost.
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