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Graphical cogeneration analysis for site utility systems

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Abstract

It is necessary to systematically evaluate site-wide power and heat generation, distribution, and utilization. A new graphical approach based on a Site Grand Composite Curve (SGCC) to targeting cogeneration in site utility systems is proposed to extend Pinch Analysis. The SGCC presents quantitative and visual process targets of heating and cooling requirements, site utility system targets for system steam generation and potential shaft power by steam expansion and condensation. Process indirect heat recovery by intermediate steam levels that can reduce fuel consumption is analyzed readily in the approach. The steam cascade in the SGCC clarifies the Total Site Pinch and site targets of utility very high pressure steam demand and site steam saving. This graphical analysis presents greater clarity for the quantitative interaction between processes and utility system targets than previous approaches. The influence of process variation and steam mains selection on cogeneration improvements is explored much clearer in this straightforward method.

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Abbreviations

c:

The power conversion coefficient based on the T–H model (°C−1)

C m :

Process cooling requirement (MW)

g :

Steam generation from process heat recovery (MW)

Q in :

The heat duty of inlet steam of the steam turbine (MW)

Q VHP :

Utility VHP steam target (MW)

Q VHPsave :

Site VHP steam saving due to process indirect heat recovery through steam mains (MW)

T in :

Steam turbine inlet steam temperature (°C)

T out :

Steam turbine exhaust temperature (°C)

T cd :

The condensation temperature (°C)

u :

Process heating requirement (MW)

W :

The potential shaft power generation by steam expansion (MW)

cd:

Condensation

cm:

Cooling medium

i :

VHP, HP, MP, and LP steam mains, respectively

IN:

New steam main introduction

IN−1:

Higher pressure steam main adjacent to the added new steam main

IN+1:

Lower pressure steam main adjacent to the added new steam main

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Acknowledgments

The support of EC Project EFENIS (contract ENER/FP7/296003/EFENIS) is sincerely acknowledged.

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Authors and Affiliations

  1. Centre for Process Integration, School of Chemical Engineering and Analytical Science, University of Manchester, Manchester, M13 9PL, UK

    Li Sun, Steve Doyle & Robin Smith

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  1. Li Sun
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  2. Steve Doyle
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  3. Robin Smith
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Correspondence to Robin Smith.

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Sun, L., Doyle, S. & Smith, R. Graphical cogeneration analysis for site utility systems. Clean Techn Environ Policy 16, 1235–1243 (2014). https://doi.org/10.1007/s10098-014-0742-7

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