Filters batch, cost

Bag filter batch load cycle and clean intermittent shaking, reverse pulse, reverse blow ring or sonic cleaifing. Load filter until the gas pressure drop across the filter is >1.5 kPa, then clean. Choice of fabric is critical static charge on fabric, operating temperature, potential for fumes to absorb with moisture to deteriorate bag, and need to select dust removal option to keep the Ap across the bag of 0.5 to 1.5 kPa. Felted material gives higher gas flow rate per unit area than woven, costs 3 to 4 times more, and cannot be cleaned by... 

Cartridge filter, batch volume > 1.5 m c/s, filter only. FOB cost = 1500 for a... 

Pressure filters or filter presses are commonly of the batch type, and are characterized by smaller floor area, high filtration rates, and lower capital cost. Dryer cakes are produced. The chemical industry uses these filters more widely than mineral processing industries, mainly because of its batch operation. The most common types of pressure filters used are the plate and frame presses. These comprise a series of vertical, alternating parallel frames and plates, with the filter cloth being held against the plate and the formation of cake occurring in the hollow frame. 

With many batch processes, the production rate will decrease during the production period for example, batch reactors and plate and frame filter presses, and there will be an optimum batch size, or optimum cycle time, that will give the minimum cost per unit of production. 

Each filtration unit can process about 100,000 kg/h of slurry, and the effluent is to be processed in 1 d. To economize on the number of filters, saccharification is divided into four staggered batches so that the filters are operating nearly continuously. The number of required filtration units for each operating condition is shown in Table 1. The capital cost associated with each filtration unit is 2,110,000. 

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