Stimulated Surface Combustion in Infrared Burners

Nikolay, Vasilik and Vladimir, Shmelev (2019) Stimulated Surface Combustion in Infrared Burners. In: 8th International Conference on Advances in Civil, Structural and Environmental Engineering - ACSEE, 12 -13 January 2019, Kuala Lumpur, Malaysia.

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A permeable matrix is placed in the flow of thecombustible gas mixture in infrared (IR) burners for theorganization and stabilization of the surface combustion regime.A stable regime of surface combustion occurs on the surface ofthe permeable matrix. Until the combustion rate of the gas mixture near the surface exceeds the velocity of the gas mixture,thesurface combustion process is stable. If the combustion ratebecomes less than the velocity of the gas mixture, the combustionzone is separated from the surface and combustion passes intothe flare mode. In our previous works it is shown that theintroduction of recuperative elements into the design of the IRburner allows to increase the heat flow from the combustionproducts to the surface of the permeable matrix and to increasethe maximum value of the specific combustion power for thesurface combustion mode to values of more than 100 W/cm2.However, at such high values of the specific power of surfacecombustion, the surface temperature of the permeable matrix increases to the values at which the surface of the permeable matrix is destroyed. Application to the surface of the permeable matrix of metal foam or wire ceramic material has increased the specific combustion power to values of more than 120 W/cm2. A further increase in the specific combustion power led to the destruction of the surface of the permeable metal matrix with a ceramic coating. Studies conducted, the results of which are presented in this paper, showed that it is possible to implement the surface combustion mode in the IR burner with specific power values of more than 200 W/cm2, if you use the design of the IR burner without a permeable matrix. To do this, it is necessary to organize the regime of stimulated surface combustion (StSC) on the surface of the recuperative elements. Mode (StSC) in the IR burner may sustained combustion of gas mixtures not capable of self-combustion, or when the velocities of the gas mixtures exceed the rate of combustion. In our experiments on laboratory models of the IR burner, the stimulated surface combustion mode with a specific combustion power of more than 290 W/cm2 was implemented. Plates 1 mm thick were used as recuperative elements. The material of the plates is made of high-temperature resistant iron-based alloy (chromium 25%, aluminium 6%,) strengthened by yttrium oxide. Environmental characteristics of IR burners operating in the mode of stimulated surface combustion with a specific power of 170-290 W/cm2 do not differ from the values typical for conventional IR burners operating at a specific power of 20-30 W/cm2. The proposed design of the IR burner allows you to get away from the problems associated with the destruction of permeable matrices.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: gas mixture, surface combustion, infrared burner
Depositing User: Mr. John Steve
Date Deposited: 06 Mar 2019 07:34
Last Modified: 06 Mar 2019 09:16

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