Bed support

Extra coarse 170-220 Filtration of very coarse materials. Gas dispersion, gas washing, and extractor beds. Support of other filter materials. 

Belt-conveyor designs use both roller and shder bed supports for the flat belt. The variety of designs available aUows proper selection of flat belts for heavy or hght loads and for various applications such as carton filling or emptying. 

ALUMINA BALLS BED SUPPORT GRATING -1— FUTURE QUENCH... 

K. Reboiler Return. The top of the reboiler return nozzle should be at least one nozzle diameter plus 12 in. (18 in. minimum) below the bed support. The bottom of the reboiler return nozzle should be 12in. minimum above the high liquid level and at least one nozzle diameter (18in. minimum) above the normal liquid level. ... 

L. Bottom Section. This is from the bottom tangent to the bottom bed support. 

Develop a detailed mechanical design of the CO conversion reactor, paying particular attention to the choice of alloy steels versus refractory linings, provisions for thermal expansion, inlet gas distribution, catalyst bed-support design, facilities for charging and discharging catalyst and provisions for instrumentation. 

Multiple horizontal beds supported on trays arranged in a vertical stack. 

Co-LTFT Sasol Slurry Bed Supported Co Slurry bubble column 2007 Oryx, Ras Laffan, Qatar... 

Columns for gel permeation chromatography must have both a minimal dead space volume at the outlet, to prevent broadening of the zones developed during the separation, and a suitable bed support, e.g. nylon mesh, which will retain the gel without becoming blocked. The length of the column affects the resolution,... 

The form of the above equations suggests that the only properties of the bed on which the pressure gradient depends are its specific surface S (or particle size d) and its voidage e. However, the structure of the bed depends additionally on the particle size distribution, the particle shape and the way in which the bed has been formed in addition both the walls of the container and the nature of the bed support can considerably affect the way the particles pack. It would be expected, therefore, that experimentally determined values of pressure gradient would show a considerable scatter relative to the values predicted by the equations. The importance of some of these factors is discussed in the next section. 

Effect of bed support. The structure of the bed, and hence K", is markedly influenced by the nature of the support. For example, the initial condition in a filtration may affect the whole of a filter cake. Figure 4.3 shows the difference in orientation of two beds of cubical particles. The importance of the packing support should not be overlooked in considering the drop in pressure through the column since the support may itself form an important resistance, and by orientating the particles as indicated may also affect the total pressure drop. 

Mechanical design of the adsorber then takes up the remainder of the engineering effort to produce a workable adsorption process design. Once a vessel is sized to provide the required inventory of adsorbenf we need to provide the mechanical details, which include flow distribution devices, bed supports and the required vessel wall thickness to withstand the working pressure and added stresses encountered during regeneration and repeated de-pressurization and re-pressurization. 

BioRad produces Bio-Spin disposable polypropylene chromatography columns (Catalog No. 732-6008) that can be packed with up to 1.2 ml gel filtration media. Their micro Bio-Spin columns hold 0.8 ml media. Both are autoclavable columns that have snap-off column tips, polyethylene media bed supports, and fit standard centrifuge tubes. 

The chemically treated oily water enters the bottom of the vessel and is distributed across the bed through nozzles mounted in a bed-support plate. 

Packed-bed supports. A simple support for a bed of lVfc-in pall rings might consist of a bar grid, with Vi-in-thick bars, set on 1 inch center. The grid itself (see Fig. 7.7) would be supported by two 6-in-wide I-beams. The open area of each component is... 

To avoid such flooding, the designer uses the corrugated bed support shown in Fig. 7.8. This grid will have over 100 percent open area. Crushed packing laying on even this excellent type of bed support can, however, cause flooding. 

Figure 15.20. Fixed bed ion exchange vessels and arrangements, (a) Typical design of a water softener, showing bed support, distributor, and effluent collector, (b) Vessel with radial-type distributors and collectors (Illinois Water Treatment Co.), (c) A double-dish underdrain system (Permutit Co.), (d) Some arrangements of vessels for cation and anion exchange.

Cartridge columns consist of 0.5-1 g of 40- m particles sandwiched between 30-jUm frits. The column s body may be a tube shrunk around a sandwich of bed support frits and packing. In another type, the frits and packing may be pushed into a small syringe barrel. The 0.5-g SFE has a sample capacity of about 25 mg and a void volume of about 1.5 mL. 

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