RU29860U1 - CELL OF THE CAROUSEL VACUUM FILTER - Google Patents

Description

2003102117

Illpipp

CELL OF THE CAROUSEL VACUUM FILTER

The utility model relates to filtration plants and can be used on a continuously rotating rotary vacuum filter.

A filter device is known (patent RU 2040318, 1995.07.25, B01 D 63/08). It includes a cylindrical housing with a removable cover and a bottom interconnected by a locking device, a collector for collecting and discharging the filtrate in the form of a perforated pipe mounted on the axis of the housing and a filter element placed around it in the form of a packet of flat filter partitions located between the flow distribution and drainage elements, containing a permeable base and made in the form of annular disks. Each element is equipped with a sealing gasket made of a polymeric material rigidly fastened to a permeable base and ring overlays. The sealing gasket is located on the inner perimeter, and the ring gaskets are installed on both sides of the outer perimeter of the annular disk. Moreover, in the drainage element, their location is the opposite.

Known filter element (patent RU 1829950, 1989.05.12, B01 D 33/19, 33/327). It is used for filtering on a continuously rotating circular conveyor mounted with the possibility of tipping over about its axis. The main wall of the filter element contains two lateral outflow sections located on both sides of the drainage channel. The latter has an inclined bottom and is made of segments with a slope of 1-8 °. The lateral sections of the outflow are equipped with deflecting screens at an angle to the drainage channel. The bottom of the drainage channel has a slope different from the slope of the end portion of the main wall of the tank. Abduction

IPC B01 D 33/00

the drainage channel starts from the place where the inclined bottom part goes into a horizontal section.

The disadvantages of this design include the fact that it is difficult to filter and remove residual water in the far corner parts of the tank and on the walls of the end section. This leads to the fact that the complete selection of the filtrate is not ensured, the remaining water affects the value of the concentration of the subsequent portion of the filtrate (out of the acceptable range).

The problem the utility model aims to solve is to increase the amount of the selected filtrate (phosphoric acid) while keeping its concentration constant.

The problem is solved as follows.

The cell of the carousel vacuum filter includes front and rear end walls, side walls that pass into the bottom, on which the supporting elements for the filter partition, the drainage channel and the end section are mounted. The cell is characterized in that the drainage channel is made along the entire length of the bottom, and the end part of the cell is made in the form of two end sections having an inclination relative to the bottom towards the drain and located on both sides of the drainage channel, and each end section is connected to the drainage channel by slope, inclined towards the drainage channel.

Such a constructive implementation of the end part of the cell makes it possible to thrust into the channel fluid located in the far section of the cell. In addition, a fast-moving fluid will not interfere with fluid draining from the corners.

A rotary rotary filter is a wheel rotating in the horizontal plane, on which a number of cells with filter elements are installed. The joints between the cells are closed and there are no gaps between the side walls, which makes it possible to fill them with a photogypsum pulp continuously during movement (rotation in a certain area).

A cell filled with a filtered pulp through a hollow front axle and a drainage hole in the front front wall, is connected to a vacuum exhaust system using a special rotary valve.

In the cell cavity under the filter element, a vacuum is created up to -0.6 kgf / cm. Atmospheric pressure acting on the entire filtration surface, squeezes moisture through the filtering partition, consisting of a sieve in the form of a grate or a perforated plate with a filter cloth stretched over it. Once the filtrate enters the cell cavity, it rushes along the inclined walls and inclined parts of the bottom into the outlet channel and flows down the inclined drain towards the drainage hole in the front end wall and through it enters the system of outlet pipelines. With further rotation to the moment when a significant part of the moisture (filtrate) has left the pulp, the cell approaches the position of unloading the solid residue, where, using the rotary lever, it overturns and the unloading process takes place.

Then, when the carousel rotates, the inverted cell is washed with water under pressure, drained and fed under load.

The effect of vacuum drawing the liquid from the cell cavity works well when there is pulp on top of the filter baffle, which helps to create the necessary pressure in the cavity. But after washing the filtering partition, the resistance to air flow on it drops sharply and the remnants of the washing water from the far peripheral sections of the cell are removed almost by gravity.

To solve the problem of increasing the productivity of the installation (with constant weight and size characteristics), it is necessary to carry out the maximum possible selection of the filtrate (phosphoric acid) and to ensure that the value of the concentration of the filtrate remains within the specified limits. To achieve this goal, you must first select the maximum possible amount of filtrate from the pulp and try to completely remove the wash water remaining inside the cell.

The most difficult to filter and remove residual water occurs in the far corner parts of the cell.

The proposed utility model is illustrated by drawings. FIG. 1 is a plan view of a cell, FIG. 2 is a longitudinal section along AA of FIG. 1 (the drainage channel for discharging the filtrate into the section did not fall), FIG. 3 is a cross-sectional view along BB of FIG. 1.

The cell (filter element) is installed in the carousel vacuum filter with the possibility of rotation about its axis (tipping over) and contains the following parts and assemblies: 1 - a side wall with a shelf to close the gap between adjacent cells, 2 side wall, 3 - drainage channel, 4 - bottom of the cell (bottom), 5 - partition, 6 - supporting elements, 7 - inclined drain 3, 8 front end wall, 9 - rear end wall, 10 - end section of the bottom 4 (there are two such sections in the cell), 11 - slope connecting the end section 10 and the drainage channel 3, 12 - renazhnoe hole in the front end wall of the cell, 13 - pin with the suction inlet of the vacuum system 14 - regiment for covering a gap between adjacent cells, 15 - pin for rotating the cell.

Side walls 1, 2, shelf 14, bottom 4 with end sections 10, drainage channel can be made from a single workpiece, for example, by stamping, or from individual parts that are connected by known methods, for example, by welding. The drainage channel 3 runs along the axis of the cell along its entire length. The side walls are closed on the front and rear sides by the end walls 8 and 9. The trunnions 13 and 15 are installed on them. The drainage channel 3 passes into the hole through which the filtrate is removed from the cell. The partition 5 consists of a perforated plate or lattice, on top of which a filter cloth is laid. The partition with the fabric is located on the supporting elements 6, made in the form of ribs, which are simultaneously stiffeners. The end part of the bottom is made in the form of two end sections 10, which are located on both sides of the drainage channel 3. Each section 10 has a slope relative to the bottom 4 in the direction of the drain. Each

the slope 11 is inclined towards the channel 3 and connects the end portion 10c with the drainage channel 3.

This design solves the problem of quick drainage of fluid. The filtrate, moving continuously and quickly in the flow along the drainage channel to the outlet, under the influence of the vacuum created by the vacuum system, picks up the last portions of the liquid and will not interfere with the flows moving away from the corners.

Claims (2)

1. The cell of the carousel vacuum filter, including the front and rear end walls, side walls passing into the bottom, on which are mounted supporting elements for the filter partition, the drainage channel and the end section, characterized in that the drainage channel is made along the entire length of the bottom, and the end part of the cell is made in the form of two end sections having a slope relative to the bottom towards the drain and located on both sides of the drainage channel, each end section being connected to the drainage channel by a, located with an inclination relative to the drainage channel. 2. The cell according to claim 1, characterized in that the side walls, shelf, bottom with end sections, drainage channel are made of a single workpiece or of individual parts.