Thermal Stability of Hexamethyldisiloxane (MM) for High-Temperature Organic Rankine Cycle (ORC)

Preißinger, Markus; Brüggemann, Dieter

doi:10.3390/en9030183

Cited by 63 publications

(40 citation statements)

References 32 publications

(32 reference statements)

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“…New chromatographic peaks were detected using GC, and the gaseous products were confirmed to be methane, ethane, ethylene, propane, propylene, and other kinds of hydrocarbons. The gaseous products of MM were mainly hydrocarbons, and the methane was the main product with a mass fraction of 85.42% in the gaseous product samples, which agreed with the results of Preißinger et al 15 The mass fraction of gaseous decomposition products was estimated using the test system shown in Figure 1 under same experimental conditions. However, the mass of gaseous decomposition products could not be measured accurately by a balance with a measurement accuracy of 0.05 g, implying that the weight of gaseous decomposition products was less than 0.05 g. The filling mass under this condition was 2.36 g, so the mass fraction of gaseous decomposition products was not more than 2.11%.…”

Section: Decomposition Product Compositionsupporting

confidence: 89%

Section: Resultsmentioning

confidence: 99%

“…Angelino et al identified the safe temperature of cyclic siloxanes as 340°C, and Fernández et al assumed the safe temperature of linear siloxanes to be 300°C, based on previous experimental results for polysiloxane and siloxane oxidation. However, Preißinger et al found that MM decomposed at 300°C in a stainless steel tube experimental system, contradicting the conclusions of Fernández et al Thus, more results about the thermal stability of siloxanes are needed for high temperature ORCs.…”

Section: Introductionmentioning

confidence: 99%

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Thermal stability of hexamethyldisiloxane (MM) as a working fluid for organic Rankine cycle

2018

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Summary The high temperature organic Rankine cycle (ORC) has recently attracted much interest for its excellent performance in renewable energy utilization and industrial waste heat recovery. The thermal stability of working fluids is the important property for fluid selection studies because of the possible decomposition at high temperatures. Siloxanes are good selections for high temperature ORCs in previous studies. However, study on the thermal stability of siloxanes for high temperature ORCs is scant. This paper studied the thermal stability of siloxanes, using hexamethyldisiloxane (MM) as a representative fluid. An experimental method with two test systems was designed to identify the compositions of decomposition products. Linear siloxanes, such as octamethyltrisiloxane (MDM), were found to be the main decomposition products of MM. The influences of pressure, temperature, and time on the decomposition were then determined experimentally. The decomposition mechanism of MM and the influences of the decomposition on ORCs were also analyzed based on the experimental results.

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Section: Decomposition Product Compositionsupporting

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermal stability of hexamethyldisiloxane (MM) as a working fluid for organic Rankine cycle

2018

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“…The Rankine cycle, at least for electrical power sizes less than 10 MW to 20 MW, employs usually an organic fluid, mostly siloxanes today [3][4][5]. Siloxanes are generally considered benign fluids, with a good thermal stability [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Pure and Hydrocarbon Binary Mixtures as Possible Alternatives Working Fluids to the Usual Organic Rankine Cycles Biomass Conversion Systems

et al. 2019

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This study investigates the use of pure and hydrocarbons binary mixtures as potential alternatives working fluids in a usual biomass powered organic Rankine cycle (ORC). A typical biomass combined heat and power plant installed in Cremona (Italy) is considered as the benchmark. Eight pure hydrocarbons (linear and cyclic) and four binary mixtures of linear hydrocarbons were selected. The critical points of the binary mixtures at different composition were calculated using an in-house code developed in MATLAB© (R2018b) environment. Based on the critical point of a working fluid, supercritical and subcritical cycle configurations of ORC were analysed. A detailed thermodynamic comparison with benchmark cycle was carried out in view of cycle efficiency, maximum operating pressure, size of the turbine and heat exchangers. The supercritical cycles showed 0.02 to 0.03 points lower efficiency, whereas, subcritical cycles showed comparable efficiencies than that of the benchmark cycle. The cycles operating with hydrocarbons (pure and mixtures) exhibited considerably lower volume flow ratios in turbine which indicates lower turbine size. Also, size parameter of regenerator is comparatively lower due to the lower molecular complexity of the hydrocarbons. A noticeable increase in turbine power output was observed with change in composition of the iso-octane/n-octane binary mixture at the same thermodynamic efficiency.

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“…Although alkylbenzenes and alkanes have higher exergetic efficiencies, siloxanes reach a similar payback period with a slightly lower cash flow due to favorable constructional parameters. Due to lower safety requirements of siloxanes, their thermal stability [97] and the broad knowledge in biomass fired power plants, siloxanes seem to be a promising chemical class for high-temperature ORC applications. Hence, the following chapter aims to derive a modular based ORC system for a broad range of heat source temperatures and mass flow rates by applying just one working fluid from one chemical class instead of adapting the working fluid to the heat source temperature.…”

Section: Modularly-designed Orcmentioning

confidence: 99%

Thermoeconomic Evaluation of Modular Organic Rankine Cycles for Waste Heat Recovery over a Broad Range of Heat Source Temperatures and Capacities

Preißinger

Brüggemann

2017

Energies

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Industrial waste heat recovery by means of an Organic Rankine Cycle (ORC) can contribute to the reduction of CO 2 emissions from industries. Before market penetration, high efficiency modular concepts have to be developed to achieve appropriate economic value for industrial decision makers. This paper aims to investigate modularly designed ORC systems from a thermoeconomic point of view. The main goal is a recommendation for a suitable chemical class of working fluids, preferable ORC design and a range of heat source temperatures and thermal capacities in which modular ORCs can be economically feasible. For this purpose, a thermoeconomic model has been developed which is based on size and complexity parameters of the ORC components. Special emphasis has been laid on the turbine model. The paper reveals that alkylbenzenes lead to higher exergetic efficiencies compared to alkanes and siloxanes. However, based on the thermoeconomic model, the payback periods of the chemical classes are almost identical. With the ORC design, the developed model and the boundary conditions of this study, hexamethyldisiloxane is a suitable working fluid and leads to a payback period of less than 5 years for a heat source temperature of 400 to 600 • C and a mass flow rate of the gaseous waste heat stream of more than 4 kg/s.

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Thermal Stability of Hexamethyldisiloxane (MM) for High-Temperature Organic Rankine Cycle (ORC)

Cited by 63 publications

References 32 publications

Thermal stability of hexamethyldisiloxane (MM) as a working fluid for organic Rankine cycle

Thermal stability of hexamethyldisiloxane (MM) as a working fluid for organic Rankine cycle

Pure and Hydrocarbon Binary Mixtures as Possible Alternatives Working Fluids to the Usual Organic Rankine Cycles Biomass Conversion Systems

Thermoeconomic Evaluation of Modular Organic Rankine Cycles for Waste Heat Recovery over a Broad Range of Heat Source Temperatures and Capacities

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