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| By installing an auxiliary burner at the center of the kiln lid, feed rate of limestones can be increased, and then the heat consumption per product can be reduced. |
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- Chlorine and Sulfur Can Be Removed Without Heat Loss.
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| Chlorine and sulfur in limestone or fuel are accumulated in the fine dust which is circulated between the combustion gas from the rotary kiln and the solid bed. Part of the exhaust gas is induced, being mixed with air and cooled for removal of the dust.The gas from which the dust is removed, is returned to the pre-heater, where the auxiliary burner consumes excessive oxygen.Then the percentage of excess air in the exhaust gas is maintained at a moderately low value.Thus, the auxiliary burner allows the chlorine and sulfur compounds to be removed without sensible heat loss due to the excessive air. |
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- Low-Sulfur Quick Lime Can Be Produced by Calcination With High-Sulfur Fuel.
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If oil coke, coal or the like containing
sulfur by 3% or more is used for limestone calcination, the content of sulfur
in the quick lime is increased to 0.03% or over, which results in the product
being not suited for the iron and steel industry.
When the CHISAKI PRE-HEATER is connected to
the rotary kiln, most part of the sulfur dioxide in the combustion gas stream
can be trapped in the form of gypsum by injecting and dispersing the pulverized
limestone into the combustion gas stream in the vicinity of the outlet of the
rotary kiln. In other words, even with a high-sulfur
fuel, low-sulfur quick lime can be produced by calcination in this system. |
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