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Utilisation of bleed steam heat to increase the upper heat source temperature in low-temperature ORC.

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Bibliographic Details
Title: Utilisation of bleed steam heat to increase the upper heat source temperature in low-temperature ORC.
Authors: Mikielewicza, Dariusz1 Dariusz.Mikielewicz@pg.gda.pl, Mikielewicz, Jarosław2
Source: Archives of Thermodynamics. 2011, Vol. 32 Issue 3, p57-70. 14p.
Subjects: Steam heating, Low temperatures, Rankine cycle, Power plants, Performance evaluation, Waste gases, Toluene, Ethanol
Abstract: In the paper presented is a novel concept to utilize the heat from the turbine bleed to improve the quality of working fluid vapour in the bottoming organic Rankine cycle (ORC). That is a completely novel solution in the literature, which contributes to the increase of ORC efficiency and the overall efficiency of the combined system of the power plant and ORC plant. Calculations have been accomplished for the case when available is a flow rate of low enthalpy hot water at a temperature of 90 oC, which is used for preliminary heating of the working fluid. That hot water is obtained as a result of conversion of exhaust gases in the power plant to the energy of hot water. Then the working fluid is further heated by the bleed steam to reach 120 oC. Such vapour is subsequently directed to the turbine. In the paper 5 possible working fluids were examined, namely R134a, MM, MDM, toluene and ethanol. Only under conditions of 120 oC/40 oC the silicone oil MM showed the best performance, in all other cases the ethanol proved to be best performing fluid of all. Results are compared with the "stand alone" ORC module showing its superiority. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:In the paper presented is a novel concept to utilize the heat from the turbine bleed to improve the quality of working fluid vapour in the bottoming organic Rankine cycle (ORC). That is a completely novel solution in the literature, which contributes to the increase of ORC efficiency and the overall efficiency of the combined system of the power plant and ORC plant. Calculations have been accomplished for the case when available is a flow rate of low enthalpy hot water at a temperature of 90 oC, which is used for preliminary heating of the working fluid. That hot water is obtained as a result of conversion of exhaust gases in the power plant to the energy of hot water. Then the working fluid is further heated by the bleed steam to reach 120 oC. Such vapour is subsequently directed to the turbine. In the paper 5 possible working fluids were examined, namely R134a, MM, MDM, toluene and ethanol. Only under conditions of 120 oC/40 oC the silicone oil MM showed the best performance, in all other cases the ethanol proved to be best performing fluid of all. Results are compared with the "stand alone" ORC module showing its superiority. [ABSTRACT FROM AUTHOR]
ISSN:12310956
DOI:10.2478/v10173-011-0013-5