Blowdown Lost steam Ikg lag+sy3.5x10° kg H,O(v) Heat Process fluid. T Boiler feedwater Steam HEAT DEAERATOR ag. H,O0). BOILER Makeup water 10 kg 2.0x10' kg H,0) EXCHANGER Condensate, H,OD 76% of steam entering exchanger (a) In your own words, describe why makeup water, chemical additives to the makeup water, and blowdown are necessary in this process. Speculate on the probable disadvantage of making the IH;O ratio in the blowdown (i) too small, and (i) too large. (b) Assume a basis of calculation and draw and fully label a flowchart of the process. (When you draw the heat exchanger you can omit the process fluid, which plays no role in the problem.) (e) Carry out a degree-of-freedom analysis and outline a solution procedure (which equations would you write in which order to calculate all of the unknowns on the chart?). (d) Calculate the ratio (mass of makeup water/100 kg steam produced in boiler) and the percentage of the boiler feedwater taken off as blowdown. (e) A proposal has been made to use highly purified water as makeup. List the benefits that would
Blowdown Lost steam Ikg lag+sy3.5x10° kg H,O(v) Heat Process fluid. T Boiler feedwater Steam HEAT DEAERATOR ag. H,O0). BOILER Makeup water 10 kg 2.0x10' kg H,0) EXCHANGER Condensate, H,OD 76% of steam entering exchanger (a) In your own words, describe why makeup water, chemical additives to the makeup water, and blowdown are necessary in this process. Speculate on the probable disadvantage of making the IH;O ratio in the blowdown (i) too small, and (i) too large. (b) Assume a basis of calculation and draw and fully label a flowchart of the process. (When you draw the heat exchanger you can omit the process fluid, which plays no role in the problem.) (e) Carry out a degree-of-freedom analysis and outline a solution procedure (which equations would you write in which order to calculate all of the unknowns on the chart?). (d) Calculate the ratio (mass of makeup water/100 kg steam produced in boiler) and the percentage of the boiler feedwater taken off as blowdown. (e) A proposal has been made to use highly purified water as makeup. List the benefits that would
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Transcribed Image Text:Blowdown
Lost steam
Ikg lag+sy3.5x10° kg
H,O(v)
Heat
Process
fluid. T
Boiler
feedwater
Steam
HEAT
DEAERATOR ag. H,O0).
BOILER
Makeup water
10 kg
2.0x10' kg H,0)
EXCHANGER
Condensate, H,OD
76% of steam entering exchanger
(a) In your own words, describe why makeup water, chemical additives to the makeup water, and
blowdown are necessary in this process. Speculate on the probable disadvantage of making the
IH;O ratio in the blowdown (i) too small, and (i) too large.
(b) Assume a basis of calculation and draw and fully label a flowchart of the process. (When you draw
the heat exchanger you can omit the process fluid, which plays no role in the problem.)
(e) Carry out a degree-of-freedom analysis and outline a solution procedure (which equations would
you write in which order to calculate all of the unknowns on the chart?).
(d) Calculate the ratio (mass of makeup water/100 kg steam produced in boiler) and the percentage of
the boiler feedwater taken off as blowdown.
(e) A proposal has been made to use highly purified water as makeup. List the benefits that would
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