The invention discloses a process
system for separating and purifying
helium from
helium-containing
natural gas, which comprises a pretreatment
system, a membrane
separation system, a VPSA
decarburization system, a TSA refined removal system, a first pressurization system, a primary membrane
separation system, a second pressurization system, a secondary membrane
separation system, a third pressurization system, a PSA purification system and an
alloy dehydrogenation system which are sequentially connected step by step through pipelines, the fourth pressurization system is arranged between the PSA purification system and the TSA refined removal system; the impermeable gas discharged by the membrane separation system is fed into a
natural gas pipeline network; low-pressure desorbed gas discharged by the VPSA
decarburization system and desorbed gas discharged by the TSA fine
desorption system are used for being fed into a fuel
pipe network; and impermeable gas discharged by the first-stage membrane separation system and desorbed gas discharged by the PSA purification system are used for refluxing to the TSA fine removal system. According to the process system,
helium can be directly separated and purified from the helium-containing
natural gas which is exploited from a gas field and pretreated, the helium
recovery rate is high, the process flow is simple, and the
energy consumption is low.