SU1745292A2 - Drum vacuum filter - Google Patents

Abstract

The invention relates to a filtering technique and makes it possible to increase the removal rate of the filtered sludge. The drum vacuum filter includes a drum with filtering cloth located on its drainage surface fixed on its end surfaces. The drum is placed in a trough with suspension. A device for removing the filtered sediment is a string installed with a slack corresponding to the curvature of the convexity of the blown sheet at the point of removal of the filtered sediment. There is an expansion beam, one end of which is fixed to the trough and the other is rigidly connected to the middle section of the string. 2 yl

Description

The invention relates to a filtering technique, can be used in the nonmetallic, chemical, lacquer and other industries and is an improvement of the invention according to the author. St. No. 1666150.

A drum vacuum filter is known, which includes a drum with filtering cloth located on its drainage surface, fixed on its end surfaces, a trough and a device for removing the filtered sediment in the form of a string installed with a slack corresponding to the curvature of the convexity of the stretched sheet at the point of removal of the filtered sediment.

The disadvantage of this filter is that even with a short pressure drop in the blowout, the string can be displaced in the vertical direction by its own weight, which reduces the removal efficiency of the filtered sludge, because the string will not be in the position where the curvature of the convexity is canvases.

The aim of the invention is to increase the removal rate of the filtered sludge.

Fig 1 shows a filter, a general view; in fig. 2 - the same, left view.

The drum vacuum filter contains a drum 1, on the end surfaces of which 2 there are notches 3, a filter sheet 4 located on the drainage surface 5 of the drum 1. The edges of the sheet 4 are bent into the notches 3 to form channels

6, in which elastic cords are placed

7. There is a device for removing the filtered sludge in the form of a string 8 installed with slack, with the sag curvature corresponding to the curvature of the convexity of the sheet 4 at the place of its stripping, which coincides with the plot of sludge removal. The drum 1 is immersed in a trough 9 with suspension. The filter is equipped with a spacer bar 10, one end of which is fixed on the trough 9. and the other

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tightly coupled to the middle portion of the string 8.

The filter works as follows. - Before equipping the drum 1 with the filter cloth 4, whose width is greater than the length of the drum 1, the edges of the blade 4 are folded into the recesses 3 of the drum 1 and stitched (or otherwise fixed) so that the channels 6 are formed through which the elastic cords 7 pass. Drainage surface b of drum 1 is wrapped with filter cloth 4, the ends of which are stitched. Then the ends of the elastic cords 7 are bonded. Instead of elastic cords, you can use wire.

Before turning on the filter, suspension is fed into the trough 9. The tension of the string 8 is adjusted so that its sag corresponds to the curvature of the convexity of the expelled web 4 in place of the filtered sediment. Then the middle portion of the string 8 is rigidly connected to the upper end of the expansion bar 10 (for example, using a yoke)

When the filter is turned on, simultaneously with the rotation of the drum 1, a vacuum pump starts to work, which creates a vacuum in the areas of sludge collection and drying, and a pump that creates pressure in the zone of blowing and sludge removal. In the event of a blowdown pressure drop, the spacer bar 10 prevents the string from lowering to the lower position,

As a base case, a drum vacuum filter BU 10 / 2.6 with a device for removing the sediment in the form of a string is taken,

installed with sagging corresponding to the curvature of the convexity of the blown sheet at the place of removal of the filtered sludge, which is used at the Chalgan kaolin plant.

According to the proposed option, the specific filter capacity was 55 kg / m2.h, whereas the specific performance of the basic filter was 52 kg / m2 h. The increase in productivity was achieved because the string does not shift downwards when the pressure of the blowout drops and the removal efficiency of the sediment does not decrease.

The implementation of the invention has an economic effect.

At the Chalgan kaolin combine, 12 filters were installed with a filtering surface of every 10 m2, then the hourly productivity of all the filters is equal to 6240 kg / h.

Annual productivity at single-shift work 18 thousand tons.

When using the proposed filter, the productivity increases by 1.06 times and will be 19.1 thousand tons in 1 g,

Claims (1)

DETAILED DESCRIPTION OF THE INVENTION Drum vacuum filter for nitrogen. No. 1666150, characterized in that, in order to increase the removal efficiency of the filtered sludge, it is provided with a spreader bar, one end of which is fixed to the trough and the other rigidly connected to the middle section of the string, Ј- ,. 9 8 Yu FIG. g