Steam consumption for indirect sludge drying
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20 tons of sludge are dried per hour through steam drying, using the hollow tube and external sleeve of a spiral dryer. Steam at 1.1 MP and 310°C; the sludge is dried from 65% to 40%. Could someone please calculate how much steam is required per hour? What is the formula used for this calculation? The temperature is 21 degrees. Also, how to choose a spiral dryer? Urgent need, please help! Thanks to all the experts :D:D
Does anyone who has nothing to do after lunch reply please?
The sludge is dried from 65% to 40% – is 65% based on wet weight or dry weight? It is also necessary to know the temperature of the sludge at the outlet of the dryer. Specific algorithm: Heat provided by steam = Heat absorbed for raising the temperature of the sludge + Heat absorbed for vaporizing the water in the sludge; thus, the steam consumption can be calculated. As for the dryer options, just provide the load and process parameters to the manufacturer and ask them to help select the appropriate model
The heat absorption of steam is easy to calculate. However, the heat absorption of sludge is an order of magnitude less than that of steam; can this be considered negligible? Also, as the moisture content in the sludge decreases, its specific heat also changes. Should we use the average of the highest and lowest temperatures?
The heat absorption of sludge is one order of magnitude less than that of steam. Can it be ignored?—— Of course, dry sludge has a lower specific heat, and it can be ignored if the error tolerance permits. The moisture content of the sludge is decreasing, and its specific heat is also changing. It can be calculated as follows: Heat absorbed by the sludge = Mass of dry sludge x Specific heat of dry sludge x Temperature difference + Mass of water in the sludge x Specific heat of water in the sludge x Temperature difference. In this case, the specific heat of the dried sludge and that of water are assumed to be constant
Have you learned it? Have you carried out sludge drying?
I am currently engaged in research on sludge drying equipment: lol
Steam at 1.1 MPa, 310°C? ! Superheated steam?
The indirect heat exchange efficiency of superheated steam is not high
Are you using it for an exam? Engineering calculations again? If it’s for design, a little engineering error is not a problem.