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UTILIZATION OF CASCADE STRUCTURE ORGANIC RANKINE CYCLE IN PETROLEUM INDUSTRY

Csaba I. Farkas orcid id orcid.org/0000-0003-3539-900X ; MOL Plc, Hungary
Istvan Rabi ; MOL Plc, Hungary


Puni tekst: engleski pdf 532 Kb

str. 354-363

preuzimanja: 662

citiraj


Sažetak

In the last few years in petroleum industry the focus of innovation has turned to the increase of energy efficiency and the reduction of carbon dioxide emission. One of the most difficult engineering challenges is the utilization of low temperature process streams (<180 °C) although the largest part of waste heat has been generated in this segment. Installation of Organic Rankine Cycle (ORC) system to the waste heat source unit is providing an adequate solution for handling of loss energy and yielding “green” electricity for the facility. This system involves the same devices as in the usual steam power plant (a boiler, a work-producing expansion device, a generator, a condenser and a pump). However, for such a system, the working fluid is an organic compound having a lower ebullition temperature than water and allowing reduced evaporating temperatures. The success of this technology is coming from its box module application: a similar ORC system can be used, with little modifications for handling various heat sources. Moreover, unlike the conventional Rankine cycle, local and small scale power generation is made possible by this technology. Today, Organic Rankine Cycles are commercially available even in the MW power range.The object of our examination in this paper is a unit having three technical points for future ORC utilization: i) a small quantity of liquid naphtha side draw at 165 °C; ii) a higher amount of vapor column overhead at 140 °C; iii) a furnace flue gas at 250 °C. We investigated the utilization of these streams in a cascade structure using isopentane as working fluid. Cascade structure has two working fluid cycles: a relatively high pressure (12.5 bar) for the utilization of higher temperature streams and a relatively low pressure (5.5 bar) for the utilization of lower temperature level streams. Analysis of the potential of energy saving has been made by supporting the steady-state process flowsheeting and simulation. As the result of this investigation promising results were brought for the industrial scale utilization of cascade ORC system. One can see the dimensions of this system including needed area of heat exchangers, calculated expander performances, efficiency of the system etc.

Ključne riječi

organic Rankine cycle; waste energy utilization; flue gas; cascade cycles

Hrčak ID:

132737

URI

https://hrcak.srce.hr/132737

Datum izdavanja:

18.12.2014.

Posjeta: 1.133 *