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Flow system preliminary design

The most important parameters for the preliminary design of an SVE system are the VOC concentration in the extracted air, the air flow rate, and the radius of influence of each extraction... [Pg.524]

In liquid-film-controlled systems the value of Koa primarily is a function of the liquid flow rate. For most random dumped tower packings the value of the exponent b in Equation 3-13 lies between 0.22 and 0.34 the exact value is characteristic of the type of packing employed. If data on the particular packing are not readily available, it is suggested that this exponent be assumed as 0.30 for preliminary designs. In such liquid-film-controlled systems there is a very small effect of gas rate. The value of the exponent c in Equation 3-13 normally is only 0.06 to 0.08. Thus, if a standard Koa value for such a system is determined to be 6.0 Ib-mol/h... [Pg.55]

Check valve seat leakage was required to be minimized to the lowest level practical. A preliminary design goal of a maximum target value was set to no greater than 0.5% of the mass flow rate when tested with helium per an established test method when seated with the baseline system dp of 100 kPa. This requirement may be necessary to minimize the impact on overall system efficiency and prevent reverse rotation of a Brayton, although some allowable leakage may be desirable. [Pg.442]

MF and UF systems can be designed to operate in various process configurations. A common configuration is one in which the feedwater is pumped with a cross-flow tangential to the membrane. The only pretreatment usually provided is a crude prescreening (usually 50 to 300 / m). The water that permeates the membrane is clean. The water that does not permeate is recirculated as concentrate and blended with additional feedwater just after the preliminary filter. To control the concentration of the solids in the recirculation loop, some of the concentrate is discharged at a specified rate. [Pg.358]

Use systems that allow maximum flexibility in air flow rates and control strategies when selection of systems is based on inaccurate (preliminary) data on production processes, volumes, and raw materials to be used in the building. Emission rates from these processes and total loads might he changed during the detailed design step. [Pg.21]

The design of simulated moving bed chromatography and its application to the separation of cycloheptanone and cyclopentanone as test substances to validate the system for subsequent chiral chromatography has been described.27 Briefly, eight silica-packed columns were hooked up in series to form a cyclic flow path. On the first pair, preliminary separation of the components was performed, with the less-retained raffinate being directed to waste. Following the second pair of columns, eluent was added. After the... [Pg.133]

In this chapter only the first step in the specification of the control systems for a process will be considered the preparation of a preliminary scheme of instrumentation and control, developed from the process flow-sheet. This can be drawn up by the process designer based on his experience with similar plant and his critical assessment of the process requirements. Many of the control loops will be conventional and a detailed analysis of the system behaviour will not be needed, nor justified. Judgement, based on experience, must be used to decide which systems are critical and need detailed analysis and design. [Pg.228]

In the recycle flow pressurization system (Figure 27.10), a portion (15-50%) of the clarified effluent from the flotation chamber is recycled, pressurized, and semisaturated with air in the air dissolving tube. The recycled flow is mixed with the unpressurized main influent stream just before admission to the flotation chamber, with the result that the air bubbles come out of aqueous phase in contact with suspended particulate matter at the inlet compartment of the flotation chamber. The system is usually employed in applications where preliminary chemical addition and flocculation are necessary and ahead of flotation. It eliminates the problems with shearing the flocculated particles since only the clarified effluent passes through the pressurizing pump and the friction valve. It should be noted, however, that the increased hydraulic flow on the flotation chamber due to the flow recirculation must be taken into account in the flotation chamber design. [Pg.1165]


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