Burning velocity measurement of fluorinated compounds by the spherical-vessel method

Takizawa, Kenji; Takahashi, Akifumi; Tokuhashi, Kazuaki; Kondô, Shigeo; Sekiya, Akira

doi:10.1016/j.combustflame.2005.01.009

Cited by 116 publications

(103 citation statements)

References 11 publications

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“…2 KCl. Further discussion will not be made here since the content of the CaF 2 synthesis will be beyond the scope of this paper [10].…”

Section: Numerical Calculation Of Commercial-scale Cdm Incineratormentioning

confidence: 98%

“…Based on the study of fundamental combustion chemistry, it is generally known that Freon HFC-134a can be thermally decomposed effectively only at high temperature over 3000°C [9,10]. However, empirical findings occurring in practical application such as calcination kiln or cokes oven have reported that if the sufficient amount of vapor exists in an high temperature environment over 800°C, then the refrigerant HFC-134a can be successfully decomposed into HF; H 2 O and CO 2 as follows [11].…”

Section: Introductionmentioning

confidence: 99%

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Experimental and numerical calculations of waste R-134a thermal decomposition for energy and fluorine material recovery

Shin¹,

Jang²,

2015

J Mater Cycles Waste Manag

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Considering the global warming potential of R-134a (C 2 H 2 F 4 ) with the substantial generation of this refrigerant as waste material in various industrial sectors, the development of proper thermal destruction method of R-134a is of great practical significance. For this, experiment and numerical calculations have initially made for a tubular-type furnace in order to figure out the basic combustion characteristics of R-134a. A series of experimental investigations for the thermal decomposition of R-134a have been made as a function of wall temperature of tubular furnace and important reacting species such as O 2 and H 2 O necessary for the decomposition of C 2 H 2 F 4 into HF, CO 2 and H 2 O. In general, the thermal decomposition of R-134a is successfully made for the condition of temperature above 800°C with the supply of stoichiometric amount of O 2 and these results are well agreed with numerical prediction. And this information is employed for the simulation of a full-scale, practical incinerator used for the CDM project. For this, numerical investigation has been made for a commercial-scale incinerator using CH 4 -air flames for the proper destruction C 2 H 2 F 4 together with the control of pollutants such as CO and NO. In general, the destruction rate of C 2 H 2 F 4 appears more than 99.99 % and the generation of CO and NO species appears rather sensitive to the operational condition such as amount of water vapor. The numerical method of HFCs (hydrofluorocarbons) thermal treatment shows high possibility as a viable tool for the proper design and optimal determination of the operational condition for a HFCs incinerator.

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“…2 KCl. Further discussion will not be made here since the content of the CaF 2 synthesis will be beyond the scope of this paper [10].…”

Section: Numerical Calculation Of Commercial-scale Cdm Incineratormentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Experimental and numerical calculations of waste R-134a thermal decomposition for energy and fluorine material recovery

Shin¹,

Jang²,

2015

J Mater Cycles Waste Manag

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“…A variation in the relative humidity can have a marked influence on both X i and  (with range of variation given by the following errors). Table 2 The first thing to notice for HFC-125 is that unlike other flame conditions, for which the flames tend not to burn above X i | X/H=1 [20][21][22], suppressing the aerosol can test required X i twice the value of X i | X/H=1 . Under that condition, the system should be severely H-atom limited.…”

Section: Stoichiometric Reactionmentioning

confidence: 99%

“…For the air in the chamber, oxygen and nitrogen at the volume fractions of 0.21 and 0.79 was assumed. Water vapor can affect both the equilibrium conditions of the mixture (as well as the kinetics) since the combustion behavior of hydrocarbon-air systems with added halogenated hydrocarbons are very sensitive to the overall hydrogen-to-halogen atom ratio in the mixture [20][21][22]. …”

Section: Calculation Of Initial Conditionsmentioning

confidence: 99%

“…Likewise, for a system with halogen and hydrogen (e.g., halogen-inhibited hydrocarbon flames), the reaction rate is much higher if halogen and hydrogen come together in their desired proportions (i.e., sufficient hydrogen). Reaction is highly favored in regions where the production of COF 2 is not occurring, since presence of this species typically signifies much lower H atom concentrations [22,23]. .…”

Section: Hfc-125mentioning

confidence: 99%

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Thermodynamic Analysis of Suppressant-Enhanced Overpressure in the FAA Aerosol Can Simulator

Linteris¹,

Takahashi²,

Katta³

et al. 2011

Fire Safety Science - Proceedings of the 10th International Sym

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The fire suppressant CF 3 Br has been banned for most applications but it is still used in come critical applications for which suitable replacements have not yet been found. One such application is the suppression of cargo-bay fires in aircraft. Recently, the agents C 2 HF 5 (pentafluoroethane, HFC-125), and bromotrifluoropropene (C 3 H 2 F 3 Br, 2-BTP) have been evaluated in a mandated Federal Aviation Administration (FAA) test, in which a simulated explosion of an aerosol can must be suppressed by the agent. Unfortunately, unlike CF 3 Br, either agent, when added at approximately one-half their inerting concentration, created a higher over-pressure in the test chamber than in tests with no agent present (thus failing the test). Similar combustion enhancement has been described in other experiments for certain conditions; however, explanation of the phenomena is lacking. As a first step in understanding this surprising result, the thermodynamics of the chemical systems are examined to predict the over pressure. For all of the cases examined, the over-pressure was predicted well by assuming that the fuel-agent-air ratio is that which produces the peak temperature, or peak CO 2 . The details of the three chemical systems are examined to provide insight into the anomalous behavior.

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Comprehensive modeling of HFC-23 incineration in a CDM incinerator

Shin

Jang

Lee

et al. 2016

J Mater Cycles Waste Manag

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Considering that a significant part of used refrigerants have to be destroyed in an environmentally friendly manner together with the high global warming potential (GWP) of HFCs (hydrofluorocarbons), the development of a proper incineration method of HFCs becomes one of the viable methods in the refrigeration and air-conditioning industry. To this end, in this study, the development of a comprehensive modeling of CHF 3 (HFC-23 or R-23) incineration is made to assist in the proper design and determination of optimal operating condition of a practical HFCs incinerator, since the refrigerant of CHF 3 is one of typical HFCs. For this, numerical investigation was performed by the development of a predictive model for the thermal destruction of the CHF 3 using CH 4 -air flames in an incinerator designed for CDM (clean development mechanism) project. First of all, comparison between calculation and operation data was made to evaluate the program developed in this study. Numerical calculation of CHF 3 -CH 4 -air flame predicts successfully the operation data of a CDM incinerator such as temperature, CHF 3 destruction rate more than 99.99 % and other species concentrations such as CO and NO at the exit of the incinerator. Further parametric study was performed also in terms of important variables such as excess air, amount of steam and incinerator size. In general, the results obtained appear physically acceptable and give a clear physical insight into the role of the important variables. Further work is strongly recommended for the development of a general turbulent reaction model for the thermal destruction of HFCs, especially for the condition of non-equilibrium turbulent reaction dominance.

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Burning velocity measurement of fluorinated compounds by the spherical-vessel method

Cited by 116 publications

References 11 publications

Experimental and numerical calculations of waste R-134a thermal decomposition for energy and fluorine material recovery

Experimental and numerical calculations of waste R-134a thermal decomposition for energy and fluorine material recovery

Thermodynamic Analysis of Suppressant-Enhanced Overpressure in the FAA Aerosol Can Simulator

Comprehensive modeling of HFC-23 incineration in a CDM incinerator

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