The Whitney Canyon plant, located in north Texas, is a mid-size plant that processes a sour gas having the following com

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The Whitney Canyon Plant Located In North Texas Is A Mid Size Plant That Processes A Sour Gas Having The Following Com 1 (53.96 KiB) Viewed 40 times

The Whitney Canyon plant, located in north Texas, is a mid-size plant that processes a sour gas having the following composition. The plant lies far from the producing field that contains 17 wells. Component N2 CO2 Mole % 0.30 6.00 H2S C1 C2 03 n24 iC4 C5+ 4.20 83.60 3.15 0.75 0.55 0.40 1.05 50 MMscfd of natural gas (saturated with water) from the field manifold enters the gathering line at a pressure of 800 psia and 80 °F. At the delivery point of the pipeline (i.e. at plant entrance) the gas P-T condition is expected to drop to 600 psia and 20°F during cold winter. Calculate the following regarding hydrate prevention program for gas transportation. a) In order to avoid hydrate formation in the pipeline, how much hydrate temperature depression is required? b) Required water removal rate (bbld) c) Minimum concentration of methanol required in the aqueous phase d) Total injection rate of pure methanol in gpm (consider methanol loss in vapor phase and liquid methanol density is 6.64 ppg at std. condition) e) If pure methanol costs $0.95 per gallon, what is the expenditure of hydrate prevention program incurred by the oilfield operator for three months of continuous injection during winter?

The same gas stream (50 MMscfd) from Problem 2 is to be processed for NGL recovery in a turbo-expander plant. An existing 4A molecular sieve bed of 1/8" beads (i.e., 4-8 mesh) is used on a 12-hr cycle with two beds. The gas enters the adsorption bed fully water saturated at 800 psia and 100°F and must be dried to 0.1 ppm water content before being processed for NGL recovery. Determine the amount of water that must be removed. The sieve bulk density is 45 lb/ft? and specific heat capacity is 0.24 Btu/lb°F. The gas viscosity can be estimated from attached figure. The pressure gradient in the adsorption bed is 0.33 psifft and the bed holds 13.5 wt% water at 70°F. Perform a preliminary design to calculate adsorption tower dimensions (i.e. ID and bed height) assuming the entire bed holds water as equilibrium zone.