Renewable gas low pressure circulation triple-column technique for regenerating process of zeolite

A regenerated-gas low-pressure circulation three-tower process type gas dehydration process for molecular sieve regeneration is provided, and the device for the process comprises a molecular sieve absorbing tower, a control valve, a separator, a blower, a heater, a cooler, and a dry and wet gas heat-exchanger. The process provided in the invention has the advantages of low energy consumption, short regeneration time because the cooling and the regeneration for molecular sieve can be carried out simultaneously, and long life of molecular sieve.