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Abstract
With intensified energy restructure in China, energy efficiency of various industrial furnaces and kilns fired by natural gas draws attentions of more and more researchers. In this article, a field test was performed for shuttle kiln popular in ceramics and refractory manufacture industry. The thermal efficiency, main heat loss, and the energy-saving potential were evaluated, and the defects of the existing kilns and improvement measure were clarified. The results show that the overall efficiency was only 13%–15%, if measured in terms of the entire heating period. The energy loss of flue gas accounted up to 50%; the effectiveness of air preheater was as low as only 30%; large amount of cold air infiltration was observed at the venting exit at the bottom of the kiln. The burner controls and gas flow within furnace remain to be optimized.
Highlights
Sensible heat byPpreheated airThe total mass flow rate of air delivered to No 1 kiln and No 2 kiln, m1 + m2, was calculated according to measured velocity (FRa) and temperature (Ta)
With intensified energy restructure in China, energy efficiency of various industrial furnaces and kilns fired by natural gas draws attentions of more and more researchers
The energy efficiency of industrial furnaces and kilns varies with their types and functions
Summary
The total mass flow rate of air delivered to No 1 kiln and No 2 kiln, m1 + m2, was calculated according to measured velocity (FRa) and temperature (Ta). The total energy carried by mixture venting into the chimney turned out to be 7.3224 3 107 kJ during the heating period (from ignition to shutoff), or equivalent to 2125 N m3 of natural gas. If the effectiveness could be increased to 50% and the averaged flue gas inlet temperature was somehow taken as 700°C, the preheated air could reach about 360°C. This means the efficiency of the kiln could be raised by about 15%. The heating period could be shortened due to increased flame temperature resulting from increased preheated air temperature
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