Optimization Cleaning cycles

Therefore, the optimal clean cycle L can be determined from the derivative of over ti from equation (7.8) ... 

There are two solutions to equation (7.12) with one being negative, which is to be ignored. The positive one gives the optimal clean cycle denoted as t. ... 

TABLE 7.1. Sample Spreadsheet for Optimal Cleaning Cycle Based on the Simple Model... 

Similarly, the optimal clean cycle can be derived from dM /dt = 0 to give... 

Heat exchanger fouling costs a lot of money for process plants. It is essential to determine the root causes and find appropriate methods for fouling mitigation from fouling prevention to exchanger cleaning cycle optimization. 

A COST-BASED MODEL EOR CLEAN CYCLE OPTIMIZATION... 

However, that s not the best optimization of vacuum application, and time. If a second cycle of incremental vacuum has great effect, so does a third total cycle Consider the following sequence of operation when the cleaning cycle is complete (1) fill the work chamber with one volume of air and displace it to the adsorber bed with another volume of air, (2) use the vacuum apparatus to create the same level of vacuum, (3) repeat step 1, (4) repeat step 2, (5) repeat step 1, (6) repeat step 2, and (7) repeat step 1. The calculated concentration of trichloroethylene in air exhaust after three incremental cycles of vacuum and three volume displacements is well below 1 ppm, and probably beyond the resolution of the calculation method This approach is partially illustrated in Table 2.9. 

In many types of processes such as batch constant-pressure filtration or fixed-bed ion exchange, the production rate decreases as a function of time. At some optimal time /opt, production is terminated (at P°pt) and the equipment is cleaned. Figure E4.12a illustrates the cumulative throughput P(t) as a function of time t for such a process. For one cycle of production and cleaning, the overall production rate is... 

PERO Innovative Services has developed the equipment and the peripheral devices in such a way that they optimally adapt to the desired cleaning process and minimise the costs during the complete life cycle of the equipment (according to LCC - Life Cycle Costing, formerly accurately related to as TCO - Total Costs of Ownership, since traditional accounting systems in most cases regard a period which is too short, as the costs as well as the benefits of the system incur over a long time utilisation of the equipment). 

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