Nitrogen Rejection Units

Cryogenic NRU offers the highest methane recovery rates. NRU solutions from 15MMSCFD to >900MMSCFD of feed gas. Inlet nitrogen concentrations from 1% to >70%.

Integrated Systems

A Chart integrated nitrogen rejection unit monetizes low btu gas reserves and provides increased revenue opportunities through the recovery of natural gas liquids (NGL) and helium and the off-take of LNG and liquid nitrogen.

Design Basis Guidelines

Single low pressure column NRU

Generally applicable to an inlet nitrogen concentration >40%

Single high pressure column NRU

Generally applicable to inlet flows <30 MMSCFD and without integrated helium recovery

Two (or more) Column NRU
Where inlet nitrogen concentrations are <40% and/or integrated helium recovery is required Chart’s patented and proven pre-fractionator nitrogen rejection technology is the optimum processing solution. The resultant two column design features a pre-fractionator followed by a low pressure NRU fractionator and offers the following:

Conditions very low nitrogen concentration inlet gases for efficient separation and minimized methane losses
Recovery of a substantial fraction of methane at elevated pressure reduces recompression horsepower
Permits higher concentrations of CO2 and C4+ hydrocarbons in the inlet feed
Permits high recovery of crude helium

Brazed Aluminum Heat Exchangers

Nitrogen Rejection Units

Product brochure for Cryogenic Nitrogen Rejection Units

Integrated Energy Systems

LNG Production

Producing LNG as an adjunct to a gas processing facility.

Holding the Key

Integrated nitrogen rejection units hold the key to unlocking gas processing. First published in Hydrocarbon Engineering in 2016.

Proven

Chart is responsible for around 25% of the world's installed NRU database and 50% of the world's name plate capacity.

Expertise

Vertically integrated design and manufacture of integral Brazed Aluminum Heat Exchangers (BAHX).

One-stop Shop

Process design, detailing and shop fabrication of flange to flange cold box solutions.

NGL Recovery

Incorporating recovery of ethane, propane and heavier hydrocarbons results in significantly reduced equipment costs and lower energy consumption compared to independent nitrogen rejection and NGL recovery units.