Circulating desanding device for dry-method anaerobic biogas slurry

The utility model belongs to the technical field of dry-method anaerobic treatment, and particularly relates to a circulating desanding device for dry-method anaerobic biogas slurry, which comprises a cyclone desander for separating settled sand and biogas slurry; the spiral feeder is used for conveying settled sand; the filtrate tank is arranged at the tail end of the spiral feeder, is connected with a liquid outlet of the spiral feeder through a liquid conveying pipe and is used for collecting biogas slurry filtered out from the settled sand; the grit chamber is arranged below a sand outlet of the spiral feeder and is used for collecting settled sand; the cyclone desander, the spiral feeder, the filtrate tank and the centrifugal pump form a set of desanding device capable of circularly removing the settled sand in the biogas slurry, the settled sand in the biogas slurry can be removed through multiple times of circular reciprocating filtering separation, and the removed settled sand and the biogas slurry wi