Round bag type frame (outer filter type) belonging to the skeleton of a dust, a certain structure and characteristics, to show a certain role and value in use, the bag of ribs, using a direct impact on the quality of the bag filter status and life. Round bag type frame can have a certain quality and performance, qualifying simple, dustproof, waterproof, UV aging, easy to maintain, easy to maintain and repair in use. XL type Swirl water film dust collector accessories mainly by Venturi, master cylinder, the upper injection tank, the lower the overflow hole, cleaning hole, etc., and its working principle is: dust flue gas flow through the inlet into the venturi, in the throat the inlet portion is evenly sprayed into the water due to the high-speed movement of the flue gas, so the water is injected into the melt into a fine mist which, wetting the ash in the flue gas feed. In this process the flue gas ash material is wet, and it is beneficial to increase the weight is centrifuged at high speed in the form of floc flow state, due to the large differences between the water droplets and dust particles, which speed difference is large. Thus, the ash particles and droplets collision occurred cohesion, especially fine dust particle material can be spray water soluble, they are separated from the ash material fully prepared, then into the cylinder. Cylinder is a circular cylinder, water injection tank into the barrel from the upper dust, the entire cylinder wall to form a water film flow from the top down, from the bottom of the cylinder to cut the flue gas entering the cylinder body rotation rose, dusty gas is always with the cylinder body wall friction film of water under the centrifugal force, so the gas is wet water film dust, dust particles with the water to the bottom of the filter, drain away from the overflow hole in the bottom of the barrel and back cover has a seal groove to prevent smoke from leaking from the bottom, have to clean the bottom of the cylinder bore for easy cleanup. After removal from the bottom of the wastewater discharged into the sedimentation tank overflow hole, settling in and, recycling. The purified gas through the upper part of the cone leads to the cylinder, so as to achieve the purpose of dedusting. Such as adding alkaline water in the pool circulating dust skeleton device can play desulfurization precipitator effect.