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Heat Transfer Topic


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#1 chaupradip

chaupradip

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Posted 13 January 2015 - 03:12 AM

Dear All,

 

I have a batch process for 40 minutes which I explain as below:

 

- the oxygen is blown into a pool of metal through the lance and due to the exothermic nature of the reaction heat is generated. To protect/cool the Lance, Soft water (200 m3/h) is pumped in the Lance. The rate of increase of temperature of soft water (from 45 DegC to 65 DegC) with time is shown in the sketch. In this batch process, the rate of O2 blowing starts from 0 minute and peaks at approx. 10-11 minutes and then is reduced to zero at 15-16 minute. The lance is taken out of the system and for the next 24 minutes the water is being cooled to 45 degC in a Secondary Circuit consisting of Heat Exchanger and Cooling Tower as shown in the sketches. The total batch time is 40 minutes and again the next batch starts at 41 minutes and so on.

 

A scheme is attached for better understanding.

 

Instead of cooling the soft hot water through the secondary ht. exchanger , cooling tower and pump, I am planning to replace the secondary circuit by providing a chilled water tank which will cool down the water to 45 degC. Chilled water is available in the plant at a temperature of 8-10 degC and a DeltaT of 5 deg is permissible. I want to find out what will be the total heat generation and the size of the chilled water tank.
 

I Think we are overdesigning the plant by taking the heat generation considering the difference of enthalpy at 65 degC and 45 degC which is practically not the case as shown in the graph. Now if I simply calculate Q=msDeltaT to find the size of the heat exchanger and the secondary water circuit including cooling tower, pumps, piping instruments etc. the cost of installation and maintenance is huge.

Availability of Chilled Water is not a problem as I am generating the same through waste heat. 
 

Any suggestion or help will be appreciated. 

 

I forgot to attach the temperature chart
 

Attached Files


Edited by chaupradip, 13 January 2015 - 05:10 AM.





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