Method for recovering helium from pipeline natural gas and device thereof

Abstract

The invention discloses a method for recovering helium from pipeline natural gas and a device thereof, which are characterized in that the pipeline natural gas is concentrated through a concentration process, and the pipeline natural gas with the helium content of 200-500ppm can be concentrated until the helium content is more than 20%; and then the concentrated raw material crude helium is purified through a purification and recovery process. For pipeline natural gas with the helium content larger than or equal to 300 ppm in China, high-purity helium is directly obtained from the pipeline natural gas through a multi-stage membrane separation assembly, a pressure swing adsorption purification device, a hydrogen-helium separation device, a temperature swing adsorption purification device and the like. Different from a low-temperature fractionation process, a composite process is adopted, the adaptability to the helium content in the natural gas is high, and the method can be directly used for treating pipeline natural gas with the concentration of 300 ppm or above and obtaining high-purity helium. The invention relates to the technical field of recovery of helium from natural gas, and can be applied to recovery and preparation of high-purity helium from natural gas pipelines, natural gas purification stations, natural gas booster stations, natural gas transfer stations, wellhead natural gas and the like.

Description

technical field [0001] The invention belongs to the technical field of helium recovery, in particular to a method and a device for recovering helium from pipeline natural gas. Background technique [0002] Helium is a colorless and odorless inert gas, widely used in optical fiber, semiconductor, medical, national defense and many other fields, and is a non-renewable scarce strategic resource. Helium is widely used and used in a large amount, but its sources are limited. The helium content in the air is about 5ppm, which has no extraction value. At present, it mainly comes from the recovery of associated helium in natural gas exploitation. [0003] my country is a typical helium-poor country. The content of helium associated with natural gas is generally between 200 and 600ppm. Directly recovering and extracting helium from natural gas faces problems such as complex technology, high cost, and low economic efficiency. The dependence rate exceeds 95%. After 2018, the annual imp...

AI Technical Summary

Problems solved by technology

More importantly, my country's LNG liquefaction plants account for a relatively small proportion compared to the huge amount of natural gas exploitation. Even if all domestic liquefaction plants carry out helium recovery projects, the helium produced only accounts for 20-30% of my country's annual helium consumption. , there is still a large gap

Images