Nitrogen gas demethanation purifier low energy consumption system

Nitrogen gas demethanation purifier low energy consumption system, relate to a nitrogen gas purification device, specifically the nitrogen gas demethanation purifier for having low energy consumptioncontrol system. The demethanation jar is connected through the pipeline with the water -cooling jar, and the methane detector is adorned in the front end of demethanation jar, methane detector passingsignal line is connected with the PLC controller, the output passing signal line of PLC controller is connected with valve switch relay with electrothermal relay respectively, the water -cooling jaris provided with cooling water input tube and cooling water outlet pipe, is equipped with the cooling water ooff valve on the cooling water input tube, be provided with diverter valve B on the nitrogen input tube between methane detector and the demethanation jar, the water -cooling jar is given vent to anger and is provided with diverter valve A on the nitrogen gas output tube of end, pass through the tube coupling between