Biogas desulfurization apparatus

The utility model discloses a biogas desulfurization apparatus, including deareator and casing, deareator air inlet and gas outlet are connected with impurity filter and transmission pipeline respectively, the cladding of casing outer wall has the heat preservation, the inside bottom of casing is equipped with the baffle, wherein, the baffle upper end is equipped with the annulus, be equipped with in the annulus with the spiral gas distribution ware that transmission pipeline is connected, the annulus outer wall with space intussuseption between the shells inner wall is filled with the desulfurizer, be equipped with a plurality of air vents on the annulus outer wall, and, the minimum particle diameter of desulfurizer is greater than the bore diameter of air vent, the desulfurizer top be equipped with impurity filter screen and gas drying layer on the casing in proper order, the casing gas outlet is connected with gaseous output tube, wherein, be equipped with gaseous check valve on the gaseous output tube, gaseous check valve with between the casing be connected with hydrogen sulfide concentration detection appearance on the gaseous output tube.