Long-term storage method for lignite blocks

The invention discloses a long-term lignite block storage method which comprises the following steps: step 1, welding a DN100 carbon steel pipeline at a nitrogen tail end contact on a pipe gallery, mounting a valve at a transition point, extending nitrogen to be vertically led to the ground, and mounting a guide shower before entering the ground; 2, a nitrogen main pipe made of DN100 carbon steel is laid on a shortcut of the coal yard, one gas connecting opening is designed to be reserved every 5-10 m and used for gas connecting of laying pipelines of the coal yard, and the interval is from east to west to the position 50 m away from a wind-shield wall on the west side of the coal yard; nitrogen is self-produced through air separation, is bridged to a coal yard through a pipeline, and is uniformly distributed at the bottom of a coal stack through nitrogen branch pipe holes, so that a nitrogen environment is formed in the coal stack, the tarpaulin covered on the coal stack is windproof, sun-proof and pulveriza