Abstract

Natural gas contains significant amounts of water that must be removed. A common way to dehydrate gas to low water levels is via a liquid desiccant such as tri-ethylene glycol (TEG) and the use of stripping gas in the regeneration system.

The patented GLYNOXX® recycle stripping gas process offers a solution to obtaining enhanced gas dehydration without wasting valuable product. In this process a small amount of stripping gas is introduced into the stripping column, which once it passes through the column is cooled to condense and separate the majority of water. The stripping gas is then recycled to the stripping column via a blower. The stripping gas used is preferably flash gas, although if sufficient quantities are not available then fuel gas may be used. Regardless of the type of stripping gas employed, the recycle process ensures that only very small make-up quantities are required on a continual basis thereby decreasing the amount of fuel gas consumed during operation. An additional advantage of the GLYNOXX process is that it reduces the amount of gas vented from a TEG dehydration plant thereby reducing the carbon emissions liability of the plant.

The GLYNOXX process may be integrated into a new TEG dehydration plant or retrofitted to an existing TEG dehydration plant. This paper details the GLYNOXX design and how it is integrated into both new and existing plants. It then compares the operation of an existing TEG dehydration plant that employs standard stripping gas operation with that of the GLYNOXX process following a retrofit, including the required plant modifications. A simplified economic analysis is presented for a retrofitted GLYNOXX process to illustrate the significant advantages of the technology for TEG dehydration plant operators.

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