Project Experience Details

Overview

• Job Ref:  158
• Type:  Helium Extraction Plant
• Size:  25 MMscfd
• Location:  West Oklahoma, United States
• Status:  Complete

Project Description

The plant is designed to process 25 MMscfd of gas containing 0.85 mol-percent of Helium and 31 mol-percent of Nitrogen. The Cryogenic Unit provides the Cold Box with 60 Mol-percent Methane, a 35 mol-percent nitrogen gas stream, and recovers a high percentage of ethane as NGL. This is achieved by cooling the inlet gas with the Cold Box return streams, refrigeration, and expansion in the Turbo-Expander. The overhead from the Demethanizer is the 60/35 feed to the Cold Box. The Cold Box utilizes expansion and internal refrigeration to separate the gas into three product streams that are used for exchange with the inlet gas. They are the low pressure residue containing less than 2 mol-percent nitrogen, the nitrogen vent containing less than 1.5 mol-percent methane, and the crude helium. The demethanizer operates in either the ethane recovery or rejection modes producing a residue gas stream and an NGL stream that meets either a Y-Grade spec or a 205 psig vapor pressure ethane-plus product.

Block Flow Diagram

Click on the image below to enlarge the block flow diagram for more details.