Abstract
This study compares three conventional methods of natural gas (Associated Natural Gas) dehydration to carry out the dehydration process and suitability of use on the basis of energy requirement. These methods are Triethylene Glycol (TEG) absorption, solid desiccant adsorption and condensation. Analyses performed were based on dehydration of Natural Gas saturated with 103Nm3/h water content at a temperature range of -10O C to 30oC, and gas pressure variation between 7MPa and 20MPa. This analysis and study showed that energy required for all three processes decreases with increase in pressure, but condensation dehydration requires the least energy at high pressures. Results obtained shows that, both at high pressures and low pressures, TEG dehydration is most suitable and in cases where very low Tdew is required, solid desiccant adsorption is preferable. In conclusion, the findings in this paper will aid natural gas process design engineers to decide on what method to use base on energy consumption and on the physical and chemical properties of the final products.Keywords: Dehydration, Absorption, Desiccant, Condensation, Triethylene Glycol (TEG)
Highlights
Natural gas usually contains significant amount of water vapour
Energy requirement in the dehydration of Associated Gas (AG) is a major contributor to the cost of operations; it means that efficient energy management must be practice in the dehydration of AG in order to account for energy loss and energy gain
The energy requirement of the three dehydration methods was carry out using a gas flow rate of 90!!"#$/& at 14.7psia and 600F from a high pressure separator
Summary
Changes in temperature and pressure condense this water vapour, altering the physical state from gas to liquid and to solid. The distribution specification set the allowable water concentration in natural gas by specifying the dew point temperature (Tdew) of natural gas (NG) Tdew as -7°C at 4 MPa, and Tdew for hydrocarbons is 0OC for NG at the operating pressures (NET4GAS, 2011). This value is equivalent to roughly 5gH2O/m3 NG at 4MPa. The Water content, which NG at saturation can contain, is dependent on the temperature and pressure within the pipeline and storage facility. The objective of the paper is to investigate the different methods of AG dehydration based on total energy consume during the process
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