Designing of the dryer section of nutritional yeast production plant – Industrial sector review – Part 12

Designing of the dryer section of nutritional yeast production plant – Industrial sector review – Part 12

Using this efficiency, the total product loss is calculated as 0.06 x 348.5 = 2.091 k/hr, which equals 16560 kg/year (plant running for 330 days). The product is sold at £10/kg, which also includes further processing costs which
are about 50% of the product cost (packing, handling, transport, taxes etc). So the product cost at this stage is nearly £5/kg. This gives a total sum of 5 x 16560 = £82, 800 lost over the whole year while operating the cyclone.

This value is quite small when compared to the difference between capital and running costs of the cyclone and precipitator/bag. Therefore the use of Cyclone is preferred for economical processing.

Cost of Electrostatic precipitator (for required duty) = £872, 500

Cost of Cyclone (for required duty) = £365, 250

The prices were evaluated from the educational version of ICheme website that assists in the evaluation of process alternatives. See costing section for more details.

PROCESS SCIENCE

This section details the physical data and Chemical data researched and collected for the use in calculations carried out in the design. For all the calculation, please refer to Appendices

Air, Psychometric Data

Psychometric charts were used (attached) to find the humidity of the air at different temperatures. The Table 3.1 below gives all the values taken from the charts. The air is taken from atmosphere, heated to 300°C, then humidified
until it takes up the required moisture content from the cream

Continued in part 13

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Posted by Ahmed Tariq on Feb 29 2012. Filed under Sci-Tech. You can follow any responses to this entry through the RSS 2.0. You can leave a response or trackback to this entry