LNG Plant-based Helium Extraction Facility

Although some natural gas fields contain helium in China, the helium content is very low and therefore it is very costly to directly extract helium from natural gases. A composition test of the noncondensate gases generated during natural gas liquefaction and the BOG (boil-off gas) generated during LNG storage shows a helium content of over 1% which is valuable for extraction. For that reason,Fullcryo has developed the technology of LNG plant-based helium extraction from BOG which uses cryogenic distillation and cryogenic condensation method to recover LNG and acquire high-purity helium gases.It is an effective way for the comprehensive development of helium resources.

Cryogenic Helium Extraction Device From BOG in LNG plant (BOG-HED)

BOG-HED primarily includes helium liquefier, BOG compressor, BOG cold box, hydrogen removal system, control system, etc.

BOG-HED

Product Profile

BOG-HED utilizes cryogenic separation method for helium extraction and liquefaction. Most methane is recovered through cryogenic distillation tower and the remaining mixture gases mostly include the nitrogen, helium and hydrogen. Then the mixtures are further cooled and most nitrogen in it is removed through condensate separation in order to produce the crude helium with a content of over 75%. Such crude helium is then subject to hydrogen-removal process through catalytic bed in order to acquire raw helium in a purity of over 95%. The raw helium then is fed to the internal freeze-out purifier  inside the helium liquefier cold box where the gases impurities are frozen and removed and high-purity helium is acquired. Finally, helium is further liquefied in the liquefier.

Based on the BOG feeding flow rate and helium concentrate in it, we can provide specified BOG-HED which is suitable for extracting helium from BOG in a LNG plant with a capacity of over 500,000Nm³/d.