Desulfurization, denitration and dust removal device for waste gas

The utility model relates to the technical field of waste gas desulfurization, denitrification and dust removal, and discloses a waste gas desulfurization, denitrification and dust removal device. The protective shell comprises an upper protective shell body, a bolt is movably installed on the side edge of the upper protective shell body, a nut is in threaded connection with the interior of the bolt, a lower protective shell body is movably installed on the upper protective shell body through the bolt, a fixing groove is formed in the middle of the lower protective shell body, and fixing columns are fixedly installed at the two ends of the fixing groove. A dust filtering layer is movably installed on the side wall of the fixing groove, a rotating shaft is movably connected to the bottom of the fixing rod in a rotating mode, a spring is fixedly installed at the upper end of the clamping head, a sliding groove connecting rod is welded to the top of the fixing rod, and an arc sliding groove is formed in the slid