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Publication Title | Organic Rankine Cycle in industrial processes

Organic Rankine Cycle

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Abstract:

PROCEEDINGS OF ECOS 2013 - THE 26TH INTERNATIONAL CONFERENCE ON EFFICIENCY, COST, OPTIMIZATION, SIMULATION AND ENVIRONMENTAL IMPACT OF ENERGY SYSTEMS JULY 16-19, 2013, GUILIN, CHINA

Organic Rankine Cycle in industrial processes

Sorina Mortadaa, Youssef Aarajb, Denis Clodicc, Walid Saidd and Elias Boulawz Ksayere

a EReIE SAS, Palaiseau, France, Sorina.mortada@ereie-sas.fr

b EReIE SAS, Palaiseau, France, youssef.aaraj@ereie-sas.fr

c EReIE SAS, Palaiseau, France, denis.clodic@ereie-sas.fr

d Mines ParisTech, Palaiseau, France, walid.said@mines-paristech.fr

e Mines ParisTech, Palaiseau, France, Elias.boulawz-ksayer@mines-paristech.fr

The organic Rankine cycle (ORC) technology is well known and the systems currently sold, generate electric power from some hundreds of kilowatts to several megawatts. Comparisons between ORC combination with various industrial processes (cement industry, refinery...) are presented in this paper. The composition and the temperature level of flue gases differ from one process to another. ORC systems adapted to heat flow are proposed considering technological and economical perspectives.

The proposed design of the ORC system is as generic as possible in terms of thermodynamic cycles and choice of working fluids. The construction materials, working fluids and expansion rates are adapted to the temperature levels. The economically viable way is to develop single-stage cycles in temperature cascade. The study aims at the definition of an optimal system able to generate electricity at a rate of 1800 €/ kWe.

Keywords:

Organic Rankine Cycle, system, design, working fluid.

1. Introduction

Flue gases emitted from industrial processes of interest for ORC systems require thermal duty larger than 15 MW in order to generate decentralized electricity at acceptable costs. Temperature varying between 170°C and 400°C allows power generation starting at 1 MWe.

Several industrial processes (cement and steel industries, refineries...) are compared in terms of temperature level, flue-gas flow rate and possible electrical power generation. This paper deals with the design and the implementation of low-cost energy recovery systems. The low-cost concept is directly related to return on investment (ROI). Operating conditions and values of energy recovered are analyzed technically and economically to determine the conditions ensuring conditions respecting the desired ROI.

The first section of this paper presents the studied processes; the second one describes an example of ORC configuration. It shows also the relation dependency of the ROI to the electricity price.

2. Industrial Processes

The study considers several industrial processes such as cement and steel industries.

Figure 1 shows a schematic flow sheet of a cement process. The cement process offers two opportunities for ORC integration, on flue gases or on air leaving the cooler. The temperature of flue gases leaving the pre-heater varies between 80°C and 400°C while the temperature of air leaving the cooler varies between 200°C and 350°C. This paper compares the two options.

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