Abstract
It is proven that the law of radiation from solid bodies, Stefan-Boltzmann law shall not be used to calculate heat radiation from gas volumes which are formed in fuel flaring. The determining influence on heat fluxes density of the torch to the heating surfaces has not only a temperature, but power, dimensions, geometrical position of radiative gas volumes. The laws of radiation from gas volumes disclosed in 2001 and the method for calculating heating fluxes from gas volumes, developed on its basis, which takes into account the radiation from full set of particles in gas volume are stated. The torch model in the form of radiative gas volume is used to calculate heat transfer in torch heating furnaces, steam boiler boxes, turbogas unit combustors. The disclosure has enabled us to create new furnaces, fire boxes, combustion chambers, enhance unit performance, and decrease fuel rate, pollutant emissions.
Highlights
In firing solid, liquid, gaseous, pulverized fuel, the energy accumulated in fuel converts into radiant heating flux
With air heated to 600 ̊C, the torch power increased by 17%, and its temperature rose from 1300 ̊C to 2000 ̊C in a torch heating furnace [2]
Under the real conditions of furnace operation, with air subjected to preheating and with the torch power increased by 17%, the heat flux density and the heating rate increase by 15% - 17%, i.e., in direct proportion to the growth of torch power and not to the fourth power of temperature [6]
Summary
In firing solid (coal, blacks, peat, wood), liquid (masout, gas tar, diesel fuel, burning oil), gaseous (natural, combination of coke-oven and blast-furnace gas), pulverized (coal dust) fuel, the energy accumulated in fuel converts into radiant heating flux. This time the laws of radiation from solid bodies for calculating radiant heat transfer in solid fuel furnaces, fire boxes were disclosed. Heating fluxes incidents on heating surfaces during firing solid fuel were calculated based on the laws of radiation from solid bodies, black bodies, laws of Planck, Wien, Stefan-Boltzmann, Lambert, and Kirchhoff. In the latter half of the 19th century, liquid, gaseous, and later pulverized fuel came into use to heat industrial, metallurgical furnaces and power boiler furnaces. Throughout the 20th century, attempts were made to use the theory of radiation from solid bodies, blackbodies radiation laws for calculating heat transfer in torch furnaces, fire boxes, combustion chambers. Let us check out the retrospective look back at the history of torches and radiant heat transfer theory in furnaces, fire boxes, combustion chambers
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