GAS PROCESSING in C#.NET

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27 GAS PROCESSING
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Gas processing (gas refining) usually involves several processes to remove: (a) oil; (b) water; (c) elements such as sulfur, helium, and carbon dioxide; and (d) natural gas liquids (Chap 6) In addition, it is often necessary to install scrubbers and heaters at or
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near the wellhead that serve primarily to remove sand and other large-particle impurities The heaters ensure that the temperature of the natural gas does not drop too low and form a hydrate (Chap 1) with the water vapor content of the gas stream Many chemical processes are available for processing or refining natural gas However, there are many variables in the choice of process of the choice of reining sequence that dictate the choice of process or processes to be employed In this choice, several factors must be considered: (a) the types and concentrations of contaminants in the gas; (b) the degree of contaminant removal desired; (c) the selectivity of acid gas removal required; (d) the temperature, pressure, volume, and composition of the gas to be processed; (e) the carbon dioxide hydrogen sulfide ratio in the gas; and (f) the desirability of sulfur recovery due to process economics or environmental issues In addition to hydrogen sulfide and carbon dioxide, gas may contain other contaminants, such as mercaptans (also called thiols, R-SH) and carbonyl sulfide (COS) The presence of these impurities may eliminate some of the sweetening processes since some processes remove large amounts of acid gas but not to a sufficiently low concentration On the other hand, there are those processes that are not designed to remove (or are incapable of removing) large amounts of acid gases However, these processes are also capable of removing the acid gas impurities to very low levels when the acid gases are there in low to medium concentrations in the gas Process selectivity indicates the preference with which the process removes one acid gas component relative to (or in preference to) another For example, some processes remove both hydrogen sulfide and carbon dioxide; other processes are designed to remove hydrogen sulfide only It is very important to consider the process selectivity for, say, hydrogen sulfide removal compared to carbon dioxide removal that ensures minimal concentrations of these components in the product, thus the need for consideration of the carbon dioxide to hydrogen sulfide in the gas stream To include a description of all of the possible process for gas cleaning is beyond the scope of this book Therefore, the focus of this chapter is a selection of the processes that are an integral part within the concept of production of a product (methane) for sale to the consumer
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271 Olamine Processes The most commonly used technique for gas processing is to first direct the gas flow through a tower containing an amine (olamine) solution Amines absorb sulfur compounds from natural gas and can be reused repeatedly After desulfurization, the gas flow is directed to the next section, which contains a series of filter tubes As the velocity of the stream reduces in the unit, primary separation of remaining contaminants occurs due to gravity Separation of smaller particles occurs as gas flows through the tubes, where they combine into larger particles which flow to the lower section of the unit Further, as the gas stream continues through the series of tubes, a centrifugal force is generated which further removes any remaining water and small solid particulate matter The processes that have been developed to accomplish gas purification vary from a simple one wash operation to complex multi-step recycling systems (Speight, 1993; Mokhatab et al, 2006; Speight, 2007b) In many cases, the process complexities arise because of the need for recovery of the materials used to remove the contaminants or even recovery of the contaminants in the original, or altered, form (Kohl and Riesenfeld, 1985; Newman, 1985) As currently practiced, acid gas removal processes involve the chemical reaction of the acid gases with a solid oxide (such as iron oxide) or selective absorption of the contaminants into a liquid (such as ethanolamine) that is passed countercurrent to the gas Then the
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