Shutdown sulfur blowing method for sulfur recovery device

A shutdown sulfur blowing method for a sulfur recovery device comprises the following steps: (1) after the amount of acid gas entering a sulfur production furnace is reduced, introducing natural gas into the sulfur production furnace for blending combustion, adjusting air distribution to enable the natural gas to be subjected to secondary equivalent combustion, and supplementing steam and nitrogen into the sulfur production furnace; (2) feeding the sulfur production unit purge tail gas into a hydrogenation unit to generate hydrogenation unit purge tail gas; (3) the hydrogenation unit purge tail gas enters an absorption regeneration unit, and the purified tail gas after H2S removal is discharged to an incinerator to be incinerated and then discharged; (4) the amine-rich liquid absorbing H2S enters a regeneration tower for amine liquid regeneration; regenerated acid gas at the top of the regeneration tower is returned to the sulfur production furnace for recycling; and (5) after 36-48 hours of sulfur blowing, g