Targeted Capacity Expansion

The target point of the capacity expansion was set at 30,000 t-zinc annually, with minimum investment. At first, we checked bottle necks at each process, when all the equipment was in full action. Then we examined measures to increase the operation of every piece of equipment up to the maximum. Mainly, gas handling in the roasting process, iron removal capacity in the hematite process, rectifiers for zinc electrolysis, cooling capacity for the electrolyte, and a transformer at the main transforming station, were considered. 

Figure 11-69 describes a typical central system. Either water or direct-expansion refrigerant coils or air washers may be used for cooling. Steam or hot-water coils are available for heating. Humidification may be provided by target-type water nozzles, pan humidifiers, air washers, or sprayed coils. Air cleaning is usually provided by cleanable or throwaway filters. Central-station air-conditioning units in capacities up to about 50,000 cu ft/min are available in prefabricated units. 

Additional fluid-lift capability was planned through a combination of increased gas-lift capacity and installation of submersible pumps. Gas-lift system expansion was critical for future flexibility of the system to allow target production rate modifications on the basis of reservoir performance. Most field gaslift compressors used to supplement plant compression were to be shut in as soon as gas-lift system expansions were completed. 

Figure 6 —Velocity distribution (peak normalized) for A1 (AI2O3) at 15 J cm X=I064 nm. Solid curve is based on a plasma gasdynamic model [3,4] using the parameters shown in the figure, where y is an effective heat capacity ratio used to model the expansion process subscript s refers to target surface condition, p the plasma, and b the molecular beam. Measurement uncertainties are v 1000 cm s" at 10 cm s" based on 5 ps channel time resolution at 47 9 cm density distribution < 0.05 arb. units.

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