Barnes Multiple Effect Evaporators - GRADED

Barnes Multiple Effect Evaporators - GRADED - Introduction...

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Unformatted text preview: Introduction Attached are several sheets meant to evaluate the performance of the evaporator section with and without a flash The cells that can be changed for a new case run are highlighted in yellow The cells that have background information are highlighted in light green The cells that have important information about the performance of the system are highlighted in bright green Explanation of terms used Steam economy=defined as the amount of water that evaporates in the evaporators for the amount of steam fed Steam economy analyzes the amount of work a given amount of steam performs in the eva Capacity=Defined as the difference between the liquor that leaves the evaporator and the liquor that is fed to the Capacity is useful for determining the flowrate of liquor that can be fed to the evaporator. Steam Usage=Defined as the amount of fresh steam fed to the first effect evaporator. This feed of steam is impo in order to judge the energy demand of the evaporators. The use of fresh steam is a valua so the lower the steam usage the lower the energy requirements of the evaporator system Energy Difference=Defined to be the difference between the base case steam usage and the proposed case stea divided by the base case steam usage. Steam usage was used because it was identified a energy cost to the system. The difference was taken with respect to the base case so that would mean that the evaporators are saving money and negative numbers mean that the e are less efficient than the base case. The above button is used for problems that have an iterative process associated with it. It utilizes a macro to auto use solver in order to find the answer necessary to force the error between the solids conte leaving the evaporators for the base and proposed cases to be 0. The entire document is protected except for the variables that are meant to be changed in order to minimize accid changes that would negate the validity of the answers. A brief description of all the effects appears on the excel sheet. h tank to the evaporators aporators evaporators ortant able resource . am usage as the t positive values evaporatos tomatically tent idental =Fresh Steam Condensate =Fresh Steam =Steam evaporated From Liquor =Liquor Fresh Steam In Flow 31059 lb/h Temp. 265.58 °F Steam Flow 23562 lb/h Temp. 218 °F Liquor out Liqour Flow 91095 lb/h Flow 114657 lb/h Solids 25 % Solids 20 % Temp. 222 °F Temp. 189 °F Liquid condensate Flow 31059 lb/h Temp. 265.58 °F Effect 1 U=150 A=4000 ft2 Cp=0.85 Steam Steam Flow 22890.82 lb/h Flow 24967.52 Temp. 185.68 °F Temp. 19.3 Liquor Liquor Flow 135032 lb/h Flow 160000 Solids 17.18 % Temp. 183 Temp. 166.86 °F Solids 14.5 Effect 2 Effect 3 U=200 A=4000 ft2 Cp=0.89 U=300 A=4000 ft2 Cp=0.92 lb/hr in Hg Vacuum lb/hr °F % Vapor from =Fresh Steam Condensate Condensate =Fresh Steam Flow 31059 lb/h Temp. 266 °F =Steam evaporated From Liquor =Liquor Steam condensate Fresh Steam In Flow 31059 lb/h Temp. 265.58 °F Steam Steam Flow 23562 lb/h...
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Barnes Multiple Effect Evaporators - GRADED - Introduction...

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