Membrane separation is one of many ways to separate methane from Co2 in biogas upgrading applications. It’s our favorite option, (obviously) and here’s why.
• Compact size & weight
• Low capital investment
• Long membrane life
• No water source needed
• Low to no maintenance
See the biogas upgrading technology comparison below for more details.
An interview with a dryer specialist from Air Products PRISM Membranes.
Q: What is the current level of involvement that Air Products has in train brake related applications? A: We supply our product line of PE air dryer membranes to several builders of air compressor systems that go on various types of trains. These customers are located in both Europe and North America, and all of our membrane products are manufactured in St. Louis, Missouri USA.
Q: Why must compressed air (on trains) be dried? A: Trains often use compressed air to power various components such as brake systems, pneumatic door systems, and even pantographs. Any humidity in the compressed air can cause deterioration and corrosion. Drying the compressed air with membrane dryers eliminates the risk of malfunctioning. Air dehydration is especially important when trains travel to areas with outdoor temperatures below freezing. In this case, the membrane dryer prevents moist compressed air from freezing and clogging the lines.
Q: What type of trains require these air dehydration systems? A: The majority of the trains that utilize our air dryer membranes are passenger trains. Some are high speed trains and even local street cars.
Q: Where are the membrane systems located in the train? A: That depends on the type of train. In some installations, the system is inside a sheltered area of a train car, while other installations have the membrane system located externally on the roof! This means that our membrane dryers may be exposed to very hot or very cold temperatures and even harsh weather.
Q: What about other drying technologies? A: Other compressed air drying technologies are common as well, but membrane dryers are often selected for their convenient smaller size, lighter weight, and mobility. Recently, a large, well-known compressor company had a prototype design that included a desiccant dryer. Maintenance technicians would have been required to use lift assist equipment to perform service on the dryer. Ultimately, the customer committed to membrane dryers in place of the desiccant due to the ease of accessibility and nearly 400 pound difference in weight.
Our Norway division is known for building world class nitrogen membrane systems for shipboard, offshore, and land based oil & gas projects. But you may be surprised to know that they also build membrane systems for air dehydration, hydrogen recovery, and CO2 capture. Each system application is detailed on their recently updated webpage. To learn more, meet the team at the upcoming SMM Maritime trade fair (booth 423) next month!
Does your facility use compressed air? For low volume compressed air dehydration, our smallest membrane dryer product is the PE1015. These small membrane dryers dehydrate compressed air for pneumatic tools, train brakes, and laboratory air compression systems.
PE1015s only weigh about one pound each and the rest of the dimensions and performance data are shared in this data sheet.
Separating compressed air with Prism Membrane separators generates two gas streams: nitrogen and oxygen enriched air (OEA). The more commonly desired gas is the nitrogen stream, but in many cases, our customers desire the oxygen enriched air stream as their product gas. Common OEA applications include nitrox (scuba dive gas), water treatment, enhanced combustion, and oxygen-enriched breathing air at high altitudes.
This data sheet provides two different performance tables for OEA generation at different pressure settings. For oxygen purities of 25 percent to 40 percent, we recommend our membrane products with N1 fiber type inside. On the other hand, for applications that require the oxygen purity to be between 40 percent and 50 percent, we recommend our P3 fiber type to reduce the amount of feed air required.