Estimate steam consumption rate in t/hr?

Posted on 2016-12-08 18:28:00 in Engineering by JELLY

Question is as follows: 
Using the steam tables provided, estimate the steam consumption rate in t/hr? 

An organic liquid feed is evaporated at atmospheric pressure in a steam heated evaporator. The steam supply is wet steam at 2.2barg. The dryness fraction is 0.89. 
The condensate is saturated condensate at 2.0barg. 
The flow rate of the methanol feed is 3.17 tonnes/hour at 14 degrees Celsius. 

Methanol Data: 
Heat Capacity - 2.94 kJ/kg K 
Latent heat of evaporation - 496 kJ/kg 
Boling point - 107 degrees Celsius at atmospheric pressure 

Now I have estimated the rate of heat transfer (Q) to be 677kW. 
From my steam table I found that hg = 2728 kJ/kg and hf = 570 kJ/kg. 

From this point - what do I do next? 

I know it is along the lines of (Df x Hg + ? + Hf) 

However this is only what I can remember up to and I have forgotten the steps that follow this - can someone help me out please?

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