Continuous compression filters

Continuous Compression Filters. The variable chamber principle appHed to batch filtration, as described before, can also be used continuously in belt presses and screw presses. 

Continuous cellulosic fibers, 20 557 Continuous compression filters, 77 379-381 Continuous conveyors, 9 119 Continuous cooling, in austenite transformation, 23 282-283 Continuous-cooling transformation (CCT) diagrams, 77 16 23 280 Continuous copper-drossing process, 74 745-747... 

Continuous compression filters include hell presses and screw presses,... 

Horizontal or vertical vessel filters, especially those with vertical rotating elements, have undergone rapid development with the aim of making truly continuous pressure filters, particularly but not exclusively for the filtration of fine coal. There are basically three categories of continuous pressure filters available, ie, disk filters, dmm filters, and belt filters including both hydrauHc and compression varieties. 

Continuously rated filters have whole sections of the filter shut off from the airflow and then those sections are shaken or cleaned. Shaking is carried out in sequence, usually by electric motor. Where the filter is cleaned it is done by a jet of compressed air being blown in reverse to the airflow through the fabric. This system does not require whole sections to be shut down, as the reverse blow is carried out when the filter is on-stream. The time of blow is very small and is measured in parts of a second rather than in minutes, as in the case of shaking filters. The application of these filters is in continuous processes and where the dust burdens are high (in excess of 100 g/m ). 

Compression drug coatings, 78 707-708 Compression filters, continuous, 77 379-381... 

Batch, semi-batch vacuum filters Continuous vacuum filters Batch, semi-batch pressure filters Continuous pressure filters Compression filters Filtering centrifuges Precoat filters... 

Typical uses Semi-continuous processing of solids forming compressible filter cakes that require efficient post-treatment. 

A recent arrival in amongst the continuous pressure filters is the Krupp filter. This is another disc filter, operated at 6 bar, where the disc assembly is driven hydraulically from outside of the pressure vessel. The cake is discharged into an internal conveyor by a blast of compressed air and removed from the vessel through a two-stage lock installed in the vessel floor. Filtration areas range from 4 to 300 m and a sophisticated automatic control and monitoring system involving a number of sensors and underwater cameras is used. 

In the precoat mode, filter aids allow filtration of very fine or compressible soHds from suspensions of 5% or lower soHds concentration on a rotary dmm precoat filter. This modification of the rotary dmm vacuum filter uses an advancing knife continuously to skim off the separated soHds and the... 

Compaction, Compression, and Expression. Compaction is a newer term for compression and is used to describe the movement of particles relative to one another within a device until the matrix of particles gains enough strength to resist further consoHdation (16). Compaction occurs in a plate and frame filter both while the chamber is filling and at the end of the cycle when the chamber is nearly full and the pressure rises steeply. Compactibihty (or compressibiUty) describes the reduction in volume of the particle matrix. Compaction also takes place in the bed of a thickener as the sohds continuously deposit on the top of the bed and a thickened slurry is withdrawn from the bottom. 

Filtration separates components according to their size. Efficiency depends on the shape and compressibility of the particles, the viscosity of the liquid phase and the driving force, which is the pressure created by overpressure or by vacuum. Filtration can be performed either as dead-end filtration, where the feed stream flows perpendicular to the filter surface (Lee, 1989) or as tangential flow filtration, where the feed stream flows parallel to the filter and the filtrate diffuses across it. Examples of the former are the continuous rotaiy vacuum dram filter, where a rotaiy vacuum filter has a filter medium covering the surface of a rotating drum and the filtrate is drawn through the dram by an... 

Fig. 11. Experimental filter pressure drop as a function of soot mass loading compared with the model taking into account the effect of gas compressibility (dashed line) and the effect of soot deposit compaction (continuous line). The indicative example is given for a soot aggregate size of 129 nm.

High pressure filter blow-off system. Oust adhering to the filters is Mown off continuously with compressed air whereby fluidizing is not interrupted. 

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