Gasification of low-melting hydrocarbon material in the airflow heated by hydrogen combustion

Shiplyuk, A. N.; Звегинцев, В. И.; Фролов, С. М.; Vnuchkov, D. A.; Киселева, Т. А.; Kislovsky, V.A.; Лукашевич, С. В.; Melnikov, A. Yu.; Nalivaychenko, D. G.

doi:10.1016/j.ijhydene.2020.01.099

Cited by 18 publications

(2 citation statements)

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“…The yield of gasification products increases with the temperature of the carrier gas and the heat absorbed by the material. The minimum ratio between the flow rates of the carrier gas and gasification products in the experiments [4,5] is estimated as 5 and 1.75 for nitrogen and air, respectively. This advantage is beneficial for solidfuel ramjets [6][7][8] operating on SCMs with a low melting point, like polyethylene (PE), polypropylene (PP), polystyrene, polybutadiene, etc.…”

Section: Introductionmentioning

confidence: 96%

“…Thus, multicomponent gaseous pyrolysis products containing hydrogen, hydrocarbons, and other compounds may exhibit the flammability/detonability, which cannot be estimated based on the flammabilities/detonabilities of the prevailing components due to the multiplicity of chemical kinetic channels for the development of chain reactions of combustion and self-ignition. The use of air as an oxidizing agent allows organizing a combustion process above an SCM sample and thereby significantly increase the efficiency of SCM gasification [4] as compared to the gasification in the inert gas environment [5]. The yield of gasification products increases with the temperature of the carrier gas and the heat absorbed by the material.…”

Section: Introductionmentioning

confidence: 99%

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Polyethylene Pyrolysis Products: Their Detonability in Air and Applicability to Solid-Fuel Detonation Ramjets

et al. 2021

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The detonability of polyethylene pyrolysis products (pyrogas) in mixtures with air is determined for the first time in a standard pulsed detonation tube based on the measured values of deflagration-to-detonation transition run-up time. The pyrogas is continuously produced in a gas generator at decomposition temperatures ranging from 650 to 850 °C. Chromatographic analysis shows that at a high decomposition temperature (850 °C) pyrogas consists mainly of hydrogen, methane, ethylene, and ethane, and has a molecular mass of about 10 g/mol, whereas at a low decomposition temperature (650 °C), it mainly consists of ethylene, ethane, methane, hydrogen, propane, and higher hydrocarbons, and has a molecular mass of 24–27 g/mol. In a pulsed detonation mode, the air mixtures of pyrogas with the fuel-to-air equivalence ratio ranging from 0.6 to 1.6 at normal pressure are shown to exhibit the detonability close to that of the homogeneous air mixtures of ethylene and propylene. On the one hand, this indicates a high explosion hazard of pyrogas, which can be formed, e.g., in industrial and household fires. On the other hand, pyrogas can be considered as a promising fuel for advanced propulsion powerplants utilizing the thermodynamic Zel’dovich cycle with detonative combustion, e.g., solid-fuel detonation ramjets. In view of it, the novel conceptual design of the dual-duct detonation ramjet demonstrator intended for operation on pyrogas at the cruising flight speed of Mach 2 at sea level has been developed. The ramjet demonstrator has been manufactured and preliminarily tested in a pulsed wind tunnel at Mach 1.5 and 2 conditions. In the test fires, a short-term onset of continuous detonation of ethylene was registered at both Mach numbers.

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