New glycol-unit design achieves VOC, BTEX reductions
1998; PennWell; Volume: 96; Issue: 28 Linguagem: Inglês
ISSN
1944-9151
Autores Tópico(s)Carbon Dioxide Capture Technologies
ResumoRemoving volatile organic compounds (VOCs) and benzene, toluene, ethyl-benzene, and xylene (BTEX) from natural-gas glycol dehydration systems does not require costly equipment or elaborate controls. This is shown by the design and installation of a 10-equivalent-tray glycol-dehydration unit for field-gas dehydration, discussed here. The absorber design minimizes the absorption of VOCs and BTEX by requiring 1--1.5 gal of glycol/pound of water removed. Glycol-unit VOC emissions are effectively controlled without installing vent-gas condensers which require disposal of the waste condensate. The emission-control system on this unit is simple to operate and meets emission standards, and the dehydrator design achieves pipeline-sales-gas specifications at a reasonable cost. The system reduces VOCs and BTEX by adding a stripper on the glycol going to the reboiler. A 50-MMscfd dehydrator was installed in December 1995; results of an emission test in April 1997 are presented here. The unit is located 0.5 mile northeast of Bloomfield, NM, on a natural-gas pipeline which operates from 170--300 psia and 35--80{degree} F.
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