TEG System · Flash Gas · Reboiler Fuel · Recovery Economics
Understand TEG absorber losses, regenerator fuel, flash gas recovery, and optimization strategies
It calculates TEG dehydration gas losses using GPSA methodology, including flash gas, stripping gas, reboiler fuel, and recovery economics.
Flash gas from the glycol flash tank (dissolved gas, plus pump power gas on gas-driven/Kimray pumps), still-overhead gas at the regenerator, and reboiler fuel (combusted). The pump power gas on gas-driven units is usually the largest single term.
It reports the annual value of the vented (recoverable) gas at your gas price — the basis for a vapor-recovery-unit (VRU) payback estimate. It does not compute a formal payback period; supply the VRU capital cost separately.
Flash gas from the glycol flash tank (dissolved gas plus, on gas-driven/Kimray pumps, the pump power gas — usually the largest term), still-overhead gas at the regenerator (residual dissolved + stripping gas), and reboiler fuel (combusted, not vented). Vented losses typically run ~0.02-0.05% of throughput on electric-pump units and ~0.1-1%+ on gas-driven units without recovery (EPA Gas STAR).
A flash tank plus vapor recovery unit (VRU) captures the flash-tank stream (dissolved flash plus any gas-driven-pump power gas), typically 80-95% of it. On most field units the single biggest reduction is converting a gas-driven (Kimray) pump to an electric pump, which removes the pump power gas entirely.
Typical stripping gas rates are 2-10 scf per gallon of TEG circulation. Stripping gas improves TEG lean purity from about 98.5% to 99%+, enabling deeper water dewpoint depression.