Authors:
Sanggono Adisasmito
and
Ekawati
Affiliation:
Chemical Engineering Department, Institut Teknologi Bandung
Keyword(s):
Propane, LPG, Emission Reduction, Condensate Stripper Reboiler.
Abstract:
A multinational gas company operating at Sumatra Island is processing 260 MMscfd of natural gas to produce around 110 MMscfd of gas sales and 26,000 bpd of NGL products. The purpose of this study is to optimize the operation in order to minimize the ratio of C2 / C3 at NGL products not to exceed 2.0%, in accordance with the technical specifications required for NGL product export. Prior to optimization, the C2 / C3 ratio of NGL products was more than 4.95%. The constraints to be considered in optimization are high gas flow rate to LP Inlet Compressor, which is limitted at 260 MMscfd, CO2 removal unit which is limitted at 170 MMscfd, and high pressure on the Condensate Stripper column which is kept at 270 psig to avoid back pressure to inlet facilities. Optimization is done by changing the operating pressure on Condensate Stripper column, temperature on Pre-treatment Chiller and temperature on Condensate Stripper Reboiler. Optimization results showed that optimum conditions were achie
ved when the operating pressure on the Condensate Stripper column was changed from 250 psig to 267 psig, the temperature at Pre-treatment Chiller changed from 65oF to 70oF and Condensate Stripper Reboiler changed from 245oF to 267oF with these optimum conditions, the C2 / C3 ratio of NGL products has been reduced to 1.38% (simulation), 2.0% (actual). Optimization process has been succeeded in lowering the flared gas in Fixed Platform Unit from 5 MMscfd to not exceed 1 MMscfd.
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