Heat Integration Chapter 9 S,S&L T&S Section 3.5 Terry Ring University of Utah

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Transcript of Heat Integration Chapter 9 S,S&L T&S Section 3.5 Terry Ring University of Utah

  • Heat IntegrationChapter 9 S,S&LT&S Section 3.5Terry RingUniversity of Utah

  • Lost Work = Lost MoneyTransfer Heat from T1 to T2T approach Temp. for Heat ExchangerTo= Temperature of EnvironmentUse 1st and 2nd laws of Thermodynamics

    LW=QToT/(T1T2)T=T1-T2To= Environment TemperatureQ= UATlm=UA (T1-T2)/ln(T1/T2)T1T2Q

  • Simple Heat Exchange Network (HEN)

  • CostsHeat Exchanger Purchase Cost CP=K(Area)0.6Annual CostCA=im[Cp,i+ CP,A,j]+sFs+(cw)Fcwim=return on investmentFs= Annual Flow of Steam, $5.5/ston to $12.1/ston = sFcw=Annual Flow of Cold Water$0.013/ston = cw

  • Capital and Operating Cost Optimization

  • Heat IntegrationMake list of HXInstead of using utilities can you use another stream to heat/cool any streams?How much of this can you do without causing operational problems?Can you use air to cool? Air is a low cost coolant.Less utilities = smaller cost of operations

  • Q

    HPC REAC-2000

    2011

    Q-2002

    HPC VSSL-2000

    2037

    13

    HPC FAXR-2000

    Q-2004

    HPC FAXR-2002

    23

    2044

    2050

    2024

    2025

    HPC PUMP-2000

    2031

    XFS1

    HPC SPLT-2001

    30

    2026

    HPC XCHG-2003

    Q-2008

    2012

    Q-2005

    HPC XCHG- 2000

    HPC XCHG-2001

    2038

    2039

    2040

    2041

    HPC RCYL-2001

    2032

    2014

    2005

    HPC XCHG-1008

    Q-2006

    6

    7

    2051

    2045

    2019

    HPC MIX-2000

    HPC VSSL-2002

    2008

    1

    2004

    HPC XCHG-2006

    XFS2

    2009

    3

    HPC XCHG-2002

    2020

    HPC MIX-2001

    2010

    2111

    2021

    2046

    HPC CMPR-2000

    2002

    Q-2001

    2047

    HPC XCHG-2004

    2042

    2043

    HPC VSSL-2003

    28

    2052

    2053

    HPC XCHG-2007

    2048

    2049

    2022

    HPC FAXR-2001

    HPC SPLT-2000

    2016

    2015

    HPC MIX-2002

    2018

    2017

    Q-2003

    HPC XCHG-2005

    HPC VSSL-2001

    HPC XCHG-2009

    Q-2007

    2027

    HPC RCYL-2002

    2029

    HPC XCHG-2016

    2115

    2116

    2117

    2101

    HPC CMPR-2010

    HPC MIX-2010

    2102

    HPC XCHG-2010

    HPC XCHG-2011

    2103

    2104

    2107

    2108

    HPC MIX-2011

    2109

    HPC REAC-2010

    2110

    HPC XCHG-2012

    2114

    2112

    HPC VSSL-2010

    HPC XCHG-2013

    113

    2105

    2106

    HPC SPLT-2010

    HPC FAXR-2010

    HPC FAXR-2011

    HPC FAXR-2012

    HPC MIX-2012

    HPC VSSL-2011

    HPC VSSL-2012

    HPC VSSL-2013

    2118

    2119

    2120

    2121

    2122

    2146

    2147

    2123

    125

    2124

    2129

    2128

    2127

    HPC RCYL-2012

    HPC SPLT-2011

    2130

    2126

    HPC PUMP-2010

    2131

    Q-2108

    2137

    HPC RCYL-2011

    2132

    HPC RCYL-2000

    HPC MIX-2003

    HPC CMPR-2001

    2033

    2034

    Q-2009

    HPC XCHG-2014

    HPC XCHG-2015

    Q-2104

    Q-2103

    Q-2105

    HPC XCHG-2017

    2142

    2143

    144

    145

    2148

    2149

    2138

    2139

    2140

    2141

    Q-2101

    HPC SPLT-2003

    2135

    2035

    HPC RCYL-2010

    Q-2106

    HPC XCHG-2018

    2150

    2151

    Q-107

    HPC XCHG-2019

    2152

    2153

    Q-2102

    2036

    2136

    MIX-100

    2

    XFS1

    2053

    HPC VLVE-2000

    2055

    HPC XCHG-2021

    2059

    2060

    Q-2011

    2061

    2057

    HPC VSSL-2004

    2058

    2062

  • Q

    HPC REAC-2000

    2011

    Q-2002

    HPC VSSL-2000

    2037

    13

    HPC FAXR-2000

    Q-2004

    HPC FAXR-2002

    23

    2044

    2050

    2024

    2025

    HPC PUMP-2000

    2031

    XFS1

    HPC SPLT-2001

    30

    2026

    HPC XCHG-2003

    Q-2008

    2012

    Q-2005

    HPC XCHG- 2000

    HPC XCHG-2001

    2038

    2039

    2040

    2041

    HPC RCYL-2001

    2032

    2014

    2005

    HPC XCHG-1008

    Q-2006

    6

    7

    2051

    2045

    2019

    HPC MIX-2000

    HPC VSSL-2002

    2008

    1

    2004

    HPC XCHG-2006

    XFS2

    2009

    3

    HPC XCHG-2002

    2020

    HPC MIX-2001

    2010

    2111

    2021

    2046

    HPC CMPR-2000

    2002

    Q-2001

    2047

    HPC XCHG-2004

    2042

    2043

    HPC VSSL-2003

    28

    2052

    2053

    HPC XCHG-2007

    2048

    2049

    2022

    HPC FAXR-2001

    HPC SPLT-2000

    2016

    2015

    HPC MIX-2002

    2018

    2017

    Q-2003

    HPC XCHG-2005

    HPC VSSL-2001

    HPC XCHG-2009

    Q-2007

    2027

    HPC RCYL-2002

    2029

    HPC XCHG-2016

    2115

    2116

    2117

    2101

    HPC CMPR-2010

    HPC MIX-2010

    2102

    HPC XCHG-2010

    HPC XCHG-2011

    2103

    2104

    2107

    2108

    HPC MIX-2011

    2109

    HPC REAC-2010

    2110

    HPC XCHG-2012

    2114

    2112

    HPC VSSL-2010

    HPC XCHG-2013

    113

    2105

    2106

    HPC SPLT-2010

    HPC FAXR-2010

    HPC FAXR-2011

    HPC FAXR-2012

    HPC MIX-2012

    HPC VSSL-2011

    HPC VSSL-2012

    HPC VSSL-2013

    2118

    2119

    2120

    2121

    2122

    2146

    2147

    2123

    125

    2124

    2129

    2128

    2127

    HPC RCYL-2012

    HPC SPLT-2011

    2130

    2126

    HPC PUMP-2010

    2131

    Q-2108

    2137

    HPC RCYL-2011

    2132

    HPC RCYL-2000

    HPC MIX-2003

    HPC CMPR-2001

    2033

    2034

    Q-2009

    HPC XCHG-2014

    HPC XCHG-2015

    Q-2104

    Q-2103

    Q-2105

    HPC XCHG-2017

    2142

    2143

    144

    145

    2148

    2149

    2138

    2139

    2140

    2141

    Q-2101

    HPC SPLT-2003

    2135

    2035

    HPC RCYL-2010

    Q-2106

    HPC XCHG-2018

    2150

    2151

    Q-107

    HPC XCHG-2019

    2152

    2153

    Q-2102

    2036

    2136

    MIX-100

    2

    XFS1

    2053

    HPC VLVE-2000

    2055

    HPC XCHG-2021

    2059

    2060

    Q-2011

    2061

    2057

    HPC VSSL-2004

    2058

    2062

  • TermsHEN=Heat Exchanger NetworkMER=Maximum Energy RecoveryMinimum Number of Heat ExchangersThreshold Approach TemperatureOptimum Approach Temperature

  • Process

  • Minimize UtilitiesFor 4 Streams

  • Simple HEN

  • Pinch Analysis1) Adjust Hot Stream Temperatures to Give TminOrder Ts, 250, 240, 235, 180, 150, 120

  • Interval Heat Loads

  • Enthalpy Differences for Temperature Intervals

  • Pinch Analysis

    Minimum Utilities=Hi+50

  • Pinch AnalysisTappMER values

  • Process

  • How to combine hot with cold?Big Exhangers 1st1st HX at Pinch (temp touching pinch)Above Pinch ConnectCcCh Below Pinch ConnectChCc2nd Hx or not touching Pinch temp.No requirement for Cc or Ch

  • 4 Heat ExchangerHEN for Min. UtilitiesCcChChCcMER Values

  • Pinch Analysis

    Minimum Utilities=Hi+50

  • Minimum Utilities HEN

  • Simple HEN

  • Too Many Heat ExchangersSometimes fewer Heat exchangers and increased utilities leads to a lower annual costNHx,min= Ns + NU - NNWs=No. streamsU=No. discrete UtilitiesNW=No. independent Networks (1 above the pinch, 1 below the pinch)Solution to Too Many Heat ExchangersBreak Heat Exchanger LoopsStream SplittingAttack small Heat Exchangers First

  • Stream SplittingTwo streams created from oneone heat exchanger on each split of stream with couplings11a1b1b1a1

  • Break Heat Exchanger Loops

  • ExampleCP=K(Area)0.6

  • Last ConsiderationsHow will HEN behave during startup?How will HEN behave during shutdown?Does HEN lead to unstable plant operation?

  • Q

    HPC REAC-2000

    2011

    Q-2002

    HPC VSSL-2000

    2037

    13

    HPC FAXR-2000

    Q-2004

    HPC FAXR-2002

    23

    2044

    2050

    2024

    2025

    HPC PUMP-2000

    2031

    XFS1

    HPC SPLT-2001

    30

    2026

    HPC XCHG-2003

    Q-2008

    2012

    Q-2005

    HPC XCHG- 2000

    HPC XCHG-2001

    2038

    2039

    2040

    2041

    HPC RCYL-2001

    2032

    2014

    2005

    HPC XCHG-1008

    Q-2006

    6

    7

    2051

    2045

    2019

    HPC MIX-2000

    HPC VSSL-2002

    2008

    1

    2004

    HPC XCHG-2006

    XFS2

    2009

    3

    HPC XCHG-2002

    2020

    HPC MIX-2001

    2010

    2111

    2021

    2046

    HPC CMPR-2000

    2002

    Q-2001

    2047

    HPC XCHG-2004

    2042

    2043

    HPC VSSL-2003

    28

    2052

    2053

    HPC XCHG-2007

    2048

    2049

    2022

    HPC FAXR-2001

    HPC SPLT-2000

    2016

    2015

    HPC MIX-2002

    2018

    2017

    Q-2003

    HPC XCHG-2005

    HPC VSSL-2001

    HPC XCHG-2009

    Q-2007

    2027

    HPC RCYL-2002

    2029

    HPC XCHG-2016

    2115

    2116

    2117

    2101

    HPC CMPR-2010

    HPC MIX-2010

    2102

    HPC XCHG-2010

    HPC XCHG-2011

    2103

    2104

    2107

    2108

    HPC MIX-2011

    2109

    HPC REAC-2010

    2110

    HPC XCHG-2012

    2114

    2112

    HPC VSSL-2010

    HPC XCHG-2013

    113

    2105

    2106

    HPC SPLT-2010

    HPC FAXR-2010

    HPC FAXR-2011

    HPC FAXR-2012

    HPC MIX-2012

    HPC VSSL-2011

    HPC VSSL-2012

    HPC VSSL-2013

    2118

    2119

    2120

    2121

    2122

    2146

    2147