الفهرس 
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Abstract
An experimental study to improve the efficiency of
radiant type gas burning furnaces was carried out in a
water coaled rectangular furnaces of inside clear dimensions
2950 x 950 x 1150 nun. This was done by adding
solid materials in a form of powder to the gaseous fuel
flame. The materials used were: ash, lime, and coal.
The radiant type furnace efficiency and the flame characteristics
were studied for the gaseous fuel alone, and
when the solid materials were added to the flame.
The naturally aspirated gas burner, provided with
a method of spraying the solid materials on the gaseous
flame with the aid of compressed air was used.
The experimental results showed that, when using
lime the efficiency decreased at low values of gas flow
rates and increased. at high gas f’Lowrates. The use of ash or coal ~creased the e~ficiency but the amount of
increase in the oase of adding coal was greater than
that in the case of adding ash because coal generates
heat, besides the effect of solid particles.
Also experimental results showed that flame emissivity,
in the oase of usiDg solid mater1.e.ls,increased
by increasing gas flow rate and/or solid particles rate.
The flame temperature increased as gas flow
rates increased. When adding coal to the gaseous fuel
flame, the temperature decreased at low primary
air-fuel ratio and at all coal flow rates, but increased
at high primary air-fuel ratio and high coal flow rates.
When adding sol±d particles of lime and ash, flame true
temperature decreased as the solid particles rates were
inoreased •
The flame intensity decreased as the primary airfuel
ratio increased when gaseous fuel was fired only,but when adding solid particles to gaseous fuel flame,
its intensity increased as the primary air-fuel ratio
and or solid materials increased.