Multi-effect double-medium filter

Abstract

The invention relates to a multi-effect double-medium filter; an inner primary filtering cylinder of the multi-effect double-medium filter is arranged in a filter shell; water inlet pipelines are symmetrically arranged at two sides of the inner primary filtering cylinder; a filter net is arranged in the inner primary filtering cylinder; the interior of a hollow shaft is divided into two independent cavities; one cavity is communicated with a backwashing buffer short section and a backwashing spray pipe; the other cavity is communicated with a residue-removing buffer short section and a residue absorbing pipe; the backwashing spray pipe and the residue absorbing pipe are in the inner primary filtering cylinder; the backwashing buffer short section and the residue-removing buffer short section sleeve the hollow shaft; a pollutant absorption motor is arranged on the top of the hollow shaft and connected with the hollow shaft so as to drive the hollow shaft; a light filter material layer and a heavy filter material layer are paved in the filter shell from top to bottom; and a ring-current backwashing structure is arranged in the light filter material layer and connected to a back-cleaning main pipe. The multi-effect double-medium filter disclosed by the invention has the advantages that the filtering effect is good; the filter material backwashing effect is good; filter materials are difficult to flow away and crush; and the multi-effect double-medium filter is convenient to maintain, etc.

Description

【Technical field】 [0001] The invention relates to a filter, in particular to a multi-effect double-media filter, which is used for treating oily sewage and slag-containing sewage, and belongs to the technical field of oilfield sewage treatment equipment. 【Background technique】 [0002] At present, the walnut shell filter / dual media filter used in the offshore oil production platform has a relatively good effect in the field of conventional oily sewage treatment, and the technology is relatively mature. However, for some heavy oil fields, especially oil fields that have adopted chemical polymer injection to increase production, the quality of production sewage has changed greatly, and the residual high molecular polymer has a strong adhesion to the filter material, and at the same time It can also form an extremely stable composite system with crude oil and sediment particles carried by the produced fluid, resulting in a large area of ​​irreversible hardening of the filter ma...

AI Technical Summary

Problems solved by technology

[0005] At the same time, in the filter material part, the traditional backwashing method adopts mechanical agitation or air pressure backwashing technology. These two backwashing methods are not effective for the filter material layer that is glued and laminated. The backwashing flow field is purely vertical. Local circulation is easy to occur, the fluidity of the severely glued area and the side near the wall is poor, and the backwashing effect on the pollutants on the surface of the filter material is uneven

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