Amine Treating & Acid Gas Compression
Carbon dioxide and hydrogen sulfide are stripped from the inlet sour gas in two amine trains, with treated-gas targets as low as 200 ppmv carbon dioxide and 2.0 ppmv hydrogen sulfide. The acid gas liberated in the amine stills is routed to a horizontal acid gas injection inlet separator and then to a compression train of four 3,000-horsepower electric-driven, five-stage reciprocating compressors on Ariel frames, with two additional units provisioned for the higher-sour future case.
Subsurface Injection & Emissions Minimization
The compressors boost the captured acid gas to a target discharge pressure of 2,200 psig for delivery to a subsurface injection well, supported by methanol injection for hydrate prevention, a dedicated lube-oil system, and acid-gas flow metering. Beyond injection, the design minimizes vented and flared emissions by routing slop-tank vapors to a dedicated vapor combustor, sending glycol-regeneration overhead to a vapor recovery and thermal oxidation system, and specifying low-NOx burners on the hot-oil heaters.
Materials & Safety Systems for High-Pressure Sour Service
ZAP’s engineering addressed the demanding requirements of high-pressure sour, corrosive service, including NACE-compliant carbon steel, post-weld heat treatment, and stainless steel in high-acid zones, along with a staged, expandable design to handle rising acid-gas concentration over the facility’s life. A standalone PLC-based safety control system with fire-and-gas detection governs the acid-gas systems, supporting a cohesive decarbonization solution for the host gas plant.
