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a . Find the annual cost if only hot and cold utilities are used to supply all the heating and cooling for the process streams
a Find the annual cost if only hot and cold utilities are used to supply all the heating
and cooling for the process streams before the heat integration
b Construct the problem table algorithm for the process with a of and
find the pinch point, the minimum utility duties and the annual cost for the
utilities after the heat integration.
c Calculate saving Total heat load before integration Total heat load after
integrationTotal heat load before integration and the minimum HCFR of each
utility streams.
d Draw the hot and cold end design to achieve a of
e Construct the new configuration after grid diagram.The following figure shows a process flowsheet in which the reactant stream
at are to be heated to and fed to a reactor. Since the
reaction is slightly endothermic, the product stream leaves the reactor at After
further heating the reactant stream to it is sent to a
distillation column to recover the product. The liquid distillate product
from the column is at and must be cooled to for
storage. The bottom product from the column is cooled from to
Although hot and cold utilities could be used for all the heating and cooling
requirements, there clearly is an opportunity for savings in heat exchange since it is
apparent from the figure that the process streams are, for the most part, within
overlapping temperature ranges. Since the reboiler temperature is too high for heat
exchange with any of the process streams, it becomes an independent heat exchange
problem. A hot oil utility stream available at and cooled to is to be used
for heating the reboiler, as well as any process heating loads not met by process
process exchange. The cost of the hot oil is $ GJ The condenser temperature is
in a range that could be used to heat some of the process streams; however, for brevity
purposes it will not be included in the present analysis. The cooling utility is cooling
water available at with an allowable temperature rise of and a cost of
$
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