Organic rankine cycle and steam turbine for intermediate temperature waste heat recovery in total site integration

Authors

  • Norhafiza Kamarudin Universiti Teknologi Malaysia
  • Liew Peng Yen Universiti Teknologi Malaysia
  • Nurfatehah Wahyuny Che Jusoh Universiti Teknologi Malaysia
  • Wai Shin Ho Universiti Teknologi Malaysia
  • Jeng Shiun Lim Universiti Teknologi Malaysia

DOI:

https://doi.org/10.11113/mjfas.v15n1.1202

Keywords:

Industrial Energy System, Organic Rankine Cycle, Steam Turbine, Combined Heat and Power (CHP), Total Site Heat Integration, Low Grade Heat Recovery

Abstract

The utilization of waste heat for heat recovery technologies in process sites has been widely known in improving the site energy saving and energy efficiency. The Total Site Heat Integration (TSHI) methodologies have been established over time to assist the integration of heat recovery technologies in process sites with a centralized utility system, which is also known as Total Site (TS). One the earliest application of TSHI concept in waste heat recovery is through steam turbine using the popular Willan’s line approach. The TSHI methodologies later were extended to integrate with wide range of heat recovery technologies in many literature, whereby Organic Rankine Cycle (ORC) has been reported to be the one of the beneficial options for heat recovery. In general, the medium to high temperature waste heat is recovered via condensing/backpressure steam turbine, whereas ORC is targeted for recovering the low temperature waste heat. However, it is known that condensing turbine is also able to generate power by condensing low grade steam to sub-ambient pressure, which is comparable with ORC integration. In this work, the integration of ORC and condensing turbine are considered for a multiple-process system to recover intermediate temperature waste heat through utility system. This study presents a numerical methodology to investigate the performance analysis of  integration of ORC and condensing turbine in process sites for recovering waste heat from a centralized utility system. A modified retrofit case study is used to demonstrate the effectiveness application of the proposed methodology. The performance of ORC and condensing steam turbine are evaluated with the plant total utility costing as the objective function.

Author Biographies

Norhafiza Kamarudin, Universiti Teknologi Malaysia

Malaysia – Japan International Institute of Technology (MJIIT)

Liew Peng Yen, Universiti Teknologi Malaysia

Process System Engineering Center (PROSPECT), Research Institute of Sustainable Environtment (RISE)

Nurfatehah Wahyuny Che Jusoh, Universiti Teknologi Malaysia

Malaysia – Japan International Institute of Technology (MJIIT)

Wai Shin Ho, Universiti Teknologi Malaysia

Faculty of Chemical and Energy Engineering

Jeng Shiun Lim, Universiti Teknologi Malaysia

Faculty of Chemical and Energy Engineering

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Published

04-03-2019