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<strong>BUITEMS</strong> Quality & Excellence in Education Optimization of Energy Consumption during Natural Gas Dehydration Gas Field Dehydration Column with the same concentration of the rich TEG. Figure 3. Rich TEG concentration on various Lean TEG Sensible heat is consumed by Glycol during the regeneration of the TEG; this indicates that as the GWR decreased from operating condition of 3.5 to 3.0 Gallon TEG / lb m of H 2 O, the sensible heat also decreased from 281.952 to 242.8936 K BTU/ hr by optimum selection of GWR and Lean TEG concentration, as shown in figure 4. Figure 5. Total Heat Transfer inside the Reboiler on Different flow rates of GWR and Lean TEG concentration Loses of TEG on different flow rates are calculated by using the Eq. 8. Figure 6 shows that as the GWR increased the losses of TEG increased at the same rate. Figure 6. TEG loses at different flow rates of GWR Figure 4. Consumption of Sensible Heat on different flow rates of GWR and Lean TEG concentration Total load on the reboiler was calculated through the sum of sensible heat of TEG, energy for vaporization of water and energy consumed inside the reflux for vaporizing the water. This resulted in decrease on the Load of reboiler as the flow rate of TEG decreased with the varing concentration of lean TEG, shown in figure 5. CONCLUSION After the detailed designing of the dehydration column it was observed that the design of the column had the satisfactorily matching with the present design and did not require any fabrication. By changing the operating conditions a handsome amount of energy was saved during the process. By changing the GWR and concentration of the Triethylene Glycol (TEG) improved the dehydration of the natural gas on the same number of the plates inside the dehydration column. Comparison of existing parameters and proposed parameters showed the following facts. 10
<strong>BUITEMS</strong> Quality & Excellence in Education Optimization of Energy Consumption during Natural Gas Dehydration With increase of the concentration from 99.0 to 99.5 % Lean TEG reduced GWR from 3.5 to 3.0 gal of TEG / lb of H 2 O. Concentration of the TEG in rich solution was maintained as the optimized condition on 96.0%, so that the regeneration of the TEG was done on the same temperature of 350°F. Glycol circulation rate reduced from the 238.42 to 204.36 gal/hr. This shows that the duty of the TEG pump reduced up to 14.5%. Total heat load on reboiler reduced from the 374573.2 to 335514.9 BTU/hr, an amount 39058 BTU/hr saved during the operation which was about 10.5% of the regeneration energy consumption. ACKNOWLEDGEMENT The authors would like to acknowledge the support of Hassan Gas Field and Pakistan Exploration (Pvt.) Limited. • Pakistan Statistical Year Book. (2011). P .159, 2011. • Saied M, William A, Poe and James GS. (2006). Handbook of Natural Gas Transmission and Processing. Elsevier. 323. • Takahashi S and Kobayashi R. (1982). The Water Content and the Solubility of CO2 in Equilibrium with DEG-Water and TEG-Water Solutions at Feasible Absorption Conditions. Technical Publication TP-9, GPA, 1982. • Vincente N, Hernandez-V, Michael WH. , Jerry AB. (1992). Design Glycol Units for Maximum Efficiency. Proceedings of the 71st GPA Annual Convention. Tulsa, OK: Gas Processors Association. 310-317. REFERENCES • Boyun G and AIi G. (2005). Natural Gas Engineering Hand Book, Gulf Publishing Company, Houston, P. 126 • Donald LK and Robert LL. (1990). Natural Gas Engineering Production and Storage, McGraw Hill International, P.617-619 • Gas Processors Suppliers Association, Engineering Data Book, 1987. • Mohamadbeigy K. (2008). Studying of the effectiveness parameters on gas dehydration plant. International Journal for Petroleum Processing, Petro-chemistry and Coal Processing. 50(2): 47-51. • Kohl A and Riesenfeld F (1985). Gas Purification. Gulf Publishing Co., Houston. • Landreau B, Amande J, Doerler N and Bojey A. (1999). Gas drying process using glycol, including purification of discharged. US patent documents. • Lurance SR. (1978). Method of removing water from glycol solutions, US patent documents. • Meyers RA. (2003). Handbook of Petroleum Refining Processes, McGraw- Hill Professional, third edition, 2003. • Pakistan Energy Yearbook. (2010). Hydrocarbon Development Institute of Pakistan, 11
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