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The turboexpander and compressor process gas pressures are sealed at the shaft by close-fitting, adjustable clea- rance, conical type labyrinth seals. A stream of compatible, warm, dry, pres- surized seal gas is injected into the middle of the labyrinth seal at a pressu- re slightly higher than the process pres- sure behind the wheel. It is the flowing seal gas which retains the cold process gas within the cases and lube oil within the bearing housing. Approximately half the seal gas will flow into the process and half the gas will flow into the bearing housing. • Rotoflow’s patented “dust-free” seal which virtually eliminates erosion of the back-rotor and shaft seals. Without this special provision, such erosion is a common and serious problem. • Rotoflow’s “drainer” seal which mixes seal gas and a small amount of bearing oil in a cavity behind the labyrinth seal. The oil/gas mixture is separa- ted in a drainer to minimize dilution and eliminate the need for external oil degassing tanks. Seal gas is vented from the top of the drainer and can be recovered in a recovery system. Oil is returned to the lubrication system. • Rotoflow’s “dry gas” seal minimizes leakage. The dry- gas seal can be applied in single or dual configurations. It is highly recommended when leakage can be hazar- dous and/or costly. Lubrication systems Rotoflow lubrication systems are an integral part of the turboexpander package. They ensure proper lubrication of all bearings at all times. Most systems are enclosed and include pressurized reservoirs for gas conservation and safety. A paten- ted continuous actual lubricant visco- sity monitor at the bearing inlet is an optional feature. Energy cost-saving applictions There are literally hundreds of applica- tions where turboexpander can save you energy and recover electricity. For example, a combined service expander/compressor is ideal for any chemical plant which takes gas streams up to a certain pressure and brings those gas streams down to a lower pressure. By using a combined service expander/compressor (instead of a valve) to reduce pressure, you’ll recover much of the money you have already invested in that gas stream. Waste heat is another energy source that can be converted to useful energy by using turboexpanders in organic Rankine cycle (ORC) systems. Potential heat sources include: tail gas from industrial furnaces or combustion engines, waste vapor from chemical and petro-chemical processes and solar heat from flat or parabolic collectors. Extraction of energy from geothermal resources offers a promising alternative to fossil fuels. CONFIGURATIONS Turboexpander — Compressor Turboexpander — Gear — Generator Gear can be integral or separate. Up to four stages of expansion can be mounted on a single gearbox. Turboexpander — Dynamometer 11PDF Image | Rotoflow turboexpanders for hydrocarbon applications
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