Nitrogen Rejection

Nitrogen Rejection

Chart’s pedigree of in-house design and fabrication of Nitrogen Rejection systems spans more than 40 years and our process know-how ensures the optimum cryogenic system regardless of nitrogen content with minimised power consumption always a primary objective.

Nitrogen is removed from natural gas to increase its calorific value. For pipeline specifications the maximum allowable nitrogen content is typically 4 to 5%, but for Liquefied Natural Gas (LNG) it is much lower at around 1%. With increased exploitation of unconventional gas sources, which typically contain higher levels of nitrogen contamination, and huge growth in LNG to fuel rising world demand for natural gas, nitrogen rejection is becoming the central focus of the gas processing chain.

Chart’s Integrated Systems to strip out the potentially lucrative natural gas liquids and helium from the feed gas and systems that additionally recover high purity LNG and refrigeration grade liquid nitrogen, ensure its position at the vanguard of nitrogen rejection technology.

Gas injection is the most commonly used approach in Enhanced Oil Recovery (EOR) with nitrogen one of the main options. In the subsequent nitrogen removal process the nitrogen content of the feed gas increases over the plant’s lifespan, which impacts the design of the Brazed Aluminum Heat Exchangers at the heart of the cryogenic process technology.

Specifications and features:

  • Variable inlet gas nitrogen content (up to 70%+)
  • Single train feed gas capacity 900+ MMSCFD
  • Integrated LNG / NGL / NRU
  • High purity LNG production
  • Integrated Helium Recovery
  • Enhanced Oil Recovery (EOR)