Abstract:
Provided is a fluid filtration unit including a housing accommodating a stationary cylindrical filter element, defining a raw fluid chamber extending between an inlet of the housing and raw fluid face of the cylindrical filter element, and a filtered fluid chamber extending between a filtered fluid face of the filter element and an outlet from the housing. A flushing and backspraying assembly includes at least one flushing pipe coupled to a lower pressure source and extending within the raw fluid chamber, and configured with a plurality of flushing nozzles disposed in close proximity with the raw fluid face of the filter element, and at least one backspraying arm coupled to a pressurized fluid source and extending within the filtered fluid chamber and configured with an array of backspraying nozzles disposed in close proximity with the filtered fluid face of the filter element, and a driving mechanism for selectively imparting the flushing and backspraying assembly with rotary and linear motion.
Abstract:
There is described an apparatus for cleaning a filter cloth, comprising: a cleaning station comprising a gas flow device and a support surface defining an aperture; and a collection device positioned below the aperture for receiving material removed from the filter cloth; wherein the gas flow device is configured to provide a flow of gas through an area of filter cloth located above the aperture so as to remove material from the filter cloth and direct it into the collection device.
Abstract:
A suction nozzle assembly, comprising a tube coupled to a pressure sink at a distal side thereof, a nozzle, a resilient element which couples said nozzle to a proximal side of said tube and a deformable housing which bridges a gap between said proximal side of said tube and said nozzle. Optionally, a pressure equalizer, for example, a through aperture, is formed in said nozzle.
Abstract:
An apparatus for filtering suspended solids from a liquid having a group of filters mounted inside a filter chamber. The filters divide the chamber into dirty liquid chambers and clean liquid chambers. A wash assembly is disposed within the chamber having vacuum/pump heads in contact with the filters rotates within the chamber. The vacuum/pump heads are connected to a pump and vacuum source located either within or without the apparatus. The vacuum/pump heads either vacuum material up or spray material therefrom in order to clean the filters. As the wash assembly rotates, the vacuum heads are able to contact and clean the entire surface of the filters. The filters are reasonably mounted in the chamber such that they may be removed from the chamber for servicing/replacement without the need to drain the chamber or enter the chamber.
Abstract:
A filtering system that includes a filter housing that includes a fluid inlet and a fluid outlet, a substantially cylindrical filter located within the filter housing, and a backwash body movably mounted within the filter housing for backwashing the substantially cylindrical filter. The backwash body includes at least one nozzle adapted to move towards the substantially cylindrical filter during a backwash operation. A method for cleaning a filtering system, the method includes: (i) determining to perform a backwash operation; (ii) helically moving a backwash body that is movably mounted within a filter housing such as to scan an inner face of a substantially cylindrical filter, during the backwash operation; and (iii) moving at least one nozzle towards the inner face of the substantially cylindrical filter, during the backwash operation.
Abstract:
A self-cleaning mechanical filter comprises a mechanism for simultaneously cleaning the internal surface and the external surface of a filter element. The filter is provided with structure for performing suction scanning of solid materials accumulated on the internal surface of the filter element, and structure which can be operated in synchronization with the suction scanning structure for backwashing the external surface of the filter element during a self-cleaning process.
Abstract:
A filter for filtering solid particles from liquids, especially for use in steam condensers and heat exchanger in thermal and nuclear power plants, said filter comprising a housing (4), a screen basket (2) located within said housing (4), a debris discharge pipe (1) for discharging accumulated and captured debris; a debris extractor arm (3) with a curvature towards the screen extending outwards at a predetermined radius with respective vertical plane, the said debris extractor arm (3) being rotatably driven over the entire length of the screen to create a low pressure between the debris extractor arm (3) and the screen (4) for complete extraction of debris and conveying to said debris discharge pipe (1).
Abstract:
The present invention is a screening/washing/dewatering system which utilizes a solids handling pump to vacuum solids captured from a contaminated fluid stream from the system's screening mechanism and to convey them, in a concentrated form and through a closed conduit, to the washing/dewatering mechanism. The use of a solids handling pump enables a screening, washing and dewatering system to contain the captured solids in a completely closed system from their point of capture, through a conveyance system of unlimited length and configuration, to the point that the washed, dewatered screenings are finally discharged. Secondarily, the present invention offers the advantages of being able to capture as small of a solids particle size as is desirable and of providing effective washing and dewatering of the captured particles while minimizing the number of moving parts and maximizing the overall system reliability.
Abstract:
A method and apparatus for filtering particulates from a turbid liquid is provided. The apparatus is preferably used to filter particulates from water used to flush a pipeline after a cleaning operation, after hydrostatic testing or during product displacement at a high flow rate. The apparatus includes an inlet valve for receiving the turbid liquid from a liquid source connected to a gas buster for discharging the turbid liquid and air into a break tank located beneath the gas buster. A self-cleaning portable liquid filter having an inlet is connected to an outlet of the break tank and includes a screen filter for receiving the turbid liquid from the break tank. Particulates from the turbid water are accumulated on an internal surface of the screen filter and clean water is discharged from the filter through a discharge port. A flush mechanism is provided to rinse the accumulated particulate cake from the surface of the screen filter upon actuation of an automatic rinse cycle. A sludge tank is located below the filter and flush mechanism for capturing a flush liquid and the particulates. A centrifugal pump driven flush line having a first end connected to the sludge tank and a second end connected to the break tank is provided for recirculating the flush liquid and accumulated particulates from the sludge tank to the break tank to be re-filtered. The turbid liquid is received from the pipeline through the inlet valve and discharged through the gas buster into the break tank. Where a plurality of break tanks are provided, the fluid levels are equalized. The turbid liquid is then pumped from the break tank to the self-cleaning portable liquid filter and a clean liquid is discharged from the outlet thereof An automatic rinse cycle is engaged upon actuation of a signal triggered by sensing of a predetermined pressure differential across an inlet and an outlet of the screen filter.
Abstract:
A backwash strainer having a generally cylindrical filter element made up of a stack of spaced rings that are triangular in cross section, with the bases of said triangular rings disposed in a cylindrical surface. A hollow backwash arm has an open slot disposed on the inside of the cylindrical surface which operates at a predetermined distance from said element. The incoming water in said strainer flows from the inlet up through the straining element to the outlet. The backwash arm receives water from around the straining element, which flows through the element into the backwash slot and out with the debris accumulated on said strainer. Since the debris is supported on the flat interior of the rings, water flowing back into the arm into the slot in the hollow backwash arm forces trash and other debris from the rings down to the backwash water outlet. Water flowing through the clearance between the bars as used, helps flush the debris off the inside of the filter element.