Reverse flushing and filter apparatus for noble, toxic and poisonous liquid and the cleaning method

Abstract

The invention relates to a back-blowing washing filter for noble, poisonous and harmful liquid and a washing method. Its character: when the filter core needs regenerative washing, it applies isopiestic pressure on inner and outer sides of the filter core at the same time, to ensure the filter cake from falling off; by setting an inserted filter separating device in the pollution discharge pipe, it discharges the forgoing liquid in the filter to pre-filter raw solution storage tank, then injects the displacement washing solution reversely through the filter separating device into the filter, and under the common action of backflushing aid gas and displacement washing solution, discharges the filter cake-containing foul solution to the backflushing foul solution storage tank. For the working condition in need of recovering solid catalyst, it adds the recovering device behind the backflushing foul solution storage tank. It has advantages of reasonable design, remarkable and economic using effect and convenient operation.

Description

[0001] Field [0002] The invention belongs to the field of petrochemical industry, metallurgy and other valuable, poisonous and harmful liquid medium filtering devices, and is especially suitable for back-flushing cleaning filter devices and cleaning methods of precious, toxic and harmful liquids. technical background [0003] In the petrochemical and other fields of the prior art, for liquid filter media with high impurity content and large processing capacity, it is the current main development trend to adopt continuous switching automatic backwash filter system. In order to achieve effective regeneration of the filter element and ensure the long-term stable performance of the filter element, the gas-assisted backwashing method is generally used in the prior art to remove the filter cake attached to the surface of the filter element and discharge its dirty liquid through the dirty liquid delivery pipeline to Sewage pool; its process is as attached figure 1 As shown (includ...

AI Technical Summary

Problems solved by technology

This backwashing method is widely used when the filter medium liquid is non-toxic or harmless or the price is relatively low, but when the filter medium liquid is a more expensive solution or a toxic and harmful solution, this backwashing method is not suitable for use

If the backwash sewage liquid contains solid catalysts that can be reused or cannot be reused but need to be recovered, it should be considered to re-separate the backwash sewage liquid entering the sewage pool to recover the solid catalysts. This consideration is not perfect

Images