Zero-loss internal recycle type gas purifying method and device

The invention relates to zero-loss internal recycle type gas purifying method and device, which use regeneration adsorbing drying towers for high temperature gas discharged by a compressor or obtained by heating the low temperature gas. In a period, one tower is taken as a drying tower while the other one is used as a regeneration tower. The method comprises the following two stages: the first stage is drying-heating regeneration stage: the high temperature gas enters the regeneration tower, then enters a post-positioned water cooler to lower the temperature, then flows to a post-positioned oil-water separator and enters the drying tower to be dried; and the second stage is drying-cold blowing regeneration stage: after the first stage is finished, a PLC controller sends a command; the direction of the high temperature gas is changed under control of a valve, and the high temperature gas firstly flows to a pre-positioned water cooler and a pre-positioned oil-water separator; partial cooled gas still enters the