Design of A Deaerator Presentation One
August 29, 2022 | Author: Anonymous | Category: N/A
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DESIGN OF A DEAERATOR FOR BOILER FEED WATER TREATMENT BY ADUSEI GEORGE G EORGE SENCHIRE SUPERVISOR SUPER VISOR : DR. MOSES MOSES Y. MENSAH
27TH APRIL,2019 ©
PRESENTATION OUTLINE
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Problem Statement
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Introduction and Objectives
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Process Selection and Description
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Summary of Chemical Engineering Calculations
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Summary of Mechanical Design Calculations Conclusion
PROB PROBLEM LEM ST STA ATEME TEMENT NT
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To design a deaerator to strip dissolved oxyg oxygen en from a condensate return stream and a makeup water flowing at a rate of 225,000 kg/hr at 125 kPa and 120⁰C to produce water at 120.9 kPa and105⁰C.
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OBJECTIVES
Main Objective •
To remove dissolved oxygen from fr om a stream of water that flows at a rate of 225,000 kg/hr to be fed to the boiler.. boiler
Specific Objectives •
To select the appropriate column type for the stripping process.
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To select the appropriate tray contractors
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To calculate the appropriate column diameter, height and number of trays.
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To perform both chemical and mechanical engineering calculations.
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INTRODUCTION
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Why Deaeration?
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Operating principles:
1.The temperature solubility relationship of gases in water. 2.Henry’s Law
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PROCESS OCESS SELECTION AND DESCRIPTION PR
Column Type •
Trays (Plates) Column
Contacting Device •
Sieve Trays
7 SUMMARY OF CHEMICAL ENGINEERING CALCULATIONS
Log{
X1 1− 1 + 1 } X2 S S , S = G (Sinnot, 2005) L log log (S) (S)
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N =
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N = Theoretical number of stages
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X1 = mole fraction of oxygen in the feed water
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X2 = mole fraction of oxygen in the deaerated water
8 TABLE 1: SUM MA R Y OF OF C H E MI CA L E NG I NE E R I NG C AL CUL ATI ONS PARAMETER
VALUE
Liquid flow rate, kg/hr
225,000
Vapour Flow rate, kg/hr
PARAM ETER
VALUE
2,163
Temperature, ⁰C
120
Liquid Vapour flow factor
2.4
Pressure, kPa
125
Flooding Velocity, m/s
3
Maximum Volumetric liquid flow, m3 /s
0.06
Number of Trays
14
Vapour Volumetric flow rate, m3 /s
1.14
Column Diameter, m
0.8
Residence time, s
6 Column Height, m
7.4
Fractional Entrainment
0.009
Enthalpy of Feed steam, kJ/hr
5.8 x 106
Tray Spacing, m
0.5
Enthalpy of Feed water, kJ/hr
54.6 x 106
Enthalpy of Deaerated Water, kJ/hr
113.3 x 106
Pressure Drop,
1.8 kPa
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CALCULATIONS TIONS SUMMARY OF MECHANICAL DESIGN CALCULA TABLE 2: SUM MA R Y OF OF M E CH A NI CA L E NG I NE E R I NG C A L CUL CU L ATI ONS PARAMETERS
VALUE
PARAMETERS Total direct stress,
kN/m2
VALUE
6707.3
Design Pressure, kPa
140
Design Temperature, ⁰C
130
Bending stress, kN
4730
Wall thickness, mm
14
Skirt height, m
2
Weight of Shell, kN
25
Skirt thickness, mm
17
Weight of Plate, kN
8.1
Bolt spacing, m
0.17
Weight of Insulation with fittings, kN
3.6
Number of bolts
16
Total weight of column, kN
36.7
Actual width of base ring, mm
141
1251.8
Actual bearing pressure on foundation, kN/m2
497.2
Total wind Loading,
N/m2
Total longitudinal stress, kN/m2
2000
Total Circumferential stress, kN/m2
4000
Material of construction of shell
Stainless steel 304
707.3
Insulation material
Mineral wool
Total dead weight stress,
kN/m2
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CONCLUSION
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Plate column was chosen and used for the t he design of the deaerator with sieve plates (trays) ( trays) selected as the type of contractors for the column. col umn.
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Chemical engineering design parameters deemed appropriate were calculated.
Mechanical engineering parameters were successfully calculated.
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REFERENCES
Robertt E. Treybal. (198 Rober (1981) 1) Mass Mass Transfer Oper Operations ations.. 3rd ed.,p:679. McGraw-Hill, Inc., New York. Underwood ,A.J.V.,(1935) Trans.Inst.Chem.Engrs. 1st ed. p:25 (vol.1)
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Christie J. Geankoplis (1993) Transport Processes and Unit Operations, 3rd ed., p: 679. Eaglewood Cliffs, New Jersey
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R. K. Sinnot Sinnott, t, Coulso Coulson n & Richards Richardson’s, on’s, (2004 (2004)) Chemical Engineering Design. Design. 3rd e ed.,p: d.,p: 550-580, 830850 (vol. 6), Butterworth-Heinemann.
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THANK THA NK Y YOU OU
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