Liquid purification or separation – With gas separator
Patent
1985-11-14
1988-06-21
Fisher, Richard V.
Liquid purification or separation
With gas separator
210328, 210344, 55185, B01D 3508
Patent
active
047523905
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an improvement made to rotary vacuum filters with a horizontal filtration plane. The said improvement relates more particularly to the distributor of vertical axis, with which these filters are equipped and the functions of which are to collect, distribute and store the fluids coming from the movable filter elements of the filter towards the fixed device or devices discharging these fluids.
Filters with a horizontal filtration plane, with which the invention is concerned and which are known at the present time, can have either an annular surface called a "filter table", divided into filter elements placed next to one another and immobilized relative to one another, and therefore receiving a continuous filter cake, or a filter surface consisting of filter cells which are placed next to one another, but which can be tilted individually.
Although the present description of the invention is based on a practical example of a filter of the type with tiltable cells, it is not limited to this type of filter, but applies equally to other type of filter known per se.
As already described in thc patent documents FR-A-No. 999,442, U.S. Pat. Nos. 2,684,158, 3,072,136, FR-A-No. 2,326,962, U.S. Pat. Nos. 4,172,791 and 4,330,404, a filter of this type is composed of a series of filter elements arranged annularly around a distributor, the said filter elements being driven in rotation about the said distributor in order to pass through a complete operating cycle, and of distributor collecting and distributing the fluids coming from the filter elements connected to it. The distributors of these known filters comprise essentially a distributing part and a collecting part which slide relative to one another, the collecting part being divided into isolated chambers and compartments delimited by partitions and in communication with one or more suction and discharge devices for the gases and liquids, the said chambers each communicating with a suction or pressure device. The distributing part has, matching each of the filter elements, cavities which, during the cyclic movement, open in succession opposite each of the compartments and chambers, in such a way that each element is put in communication successively with each of the said compartments and chambers.
However, these filters equipped with the known distributors have many disadvantages.
On the one hand, the bulk of the devices of known type is fairly large, because of the presence of compartments in the form of individual receptacles combined with draw-off and such like pipes.
On the other hand, the separation of the gases and liquids is often unsatisfactory, because this separation usually has to be carried out in small volumes with changes in direction of less than 180.degree.. Moreover, pre-suction is very difficult, indeed impossible, to adjust accurately. By pre-suction is meant a first filtration, during which the first turbid filtrate is collected during the formation of the filter cake.
It has also been proposed in the patent document FR-A-No. 999,442 to arrange the gas separation chamber outside the actual distributor. However, this solution does not solve all the problems satisfactorily, and the bulk still remains large.
The object of the present invention is consequently to provide a continuous rotary vacuum filter with a horizontal filtration plane, the distributor of which has a more compact construction allowing a saving of space or, with a bulk similar to that of known filters, a mode of operation with markedly larger volumes of filtrate buffer compartments. Moreover, the aim is also to improve the separation of the gases and liquids and provide the possibility of easier adjustment of pre-suction and the addition of ancillary functions.
Consequently, the present invention relates to a rotary vacuum filter with a substantially horizontal filtration plane, which possesses a distributor consisting of a fixed collecting part composed of a single generally cylindrical tank, of a movable distributing part possessing cavities communi
REFERENCES:
patent: 2684158 (1954-07-01), Delruelle
patent: 2997068 (1961-08-01), Roos
patent: 3072136 (1963-01-01), Roos
patent: 3361262 (1968-01-01), Orr et al.
patent: 3830658 (1974-08-01), Davister
patent: 4172791 (1979-10-01), Davister
patent: 4330404 (1982-05-01), Davister
patent: 4603000 (1986-07-01), Casey
Davister Armand L.
Martin Georges-Francois
Fisher Richard V.
Millard Wanda L.
Prayon Developpement S.A.
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