Process And System For Reducing Ringing In Lime Kilns

Abstract

This application discloses exemplary processes and systems for reducing mineral ring accumulation in calcination kiln. The processes and systems comprise inserting non-condensable gases (NCGs) in a preheating zone of a calcination kiln, upstream of the burner end. The pre heating zone may be characterized by temperatures ranging from 1,300 DEG F to 1,7500 DEG F. The system may desirably comprise aplenum for inserting the NCGs into the rotating calcination kiln at the pre-heating zone.

Description

technical field [0001] The present invention relates generally to pollution control and pollutant management in elongated rotary calciners, and more particularly to the reduction of nitrogen oxides ("NO X ”) and reduce mid-kiln mineral accumulation in lime mud kilns used for chemical recovery in the pulp and paper industry. Background technique [0002] There are several methods of producing pulp on an industrial scale, and producers tend to classify these methods into one of three broad categories: chemical pulping, mechanical pulping, and hybrid pulping. Hybrid pulping involves different aspects of chemical and mechanical pulping. Briefly, mechanical pulping typically involves feeding lignocellulosic material (such as wood chips, bagasse, corn stover, recycled paper, or other materials containing proteinaceous lignin and cellulosic polymers) through a series of refiner plates. The refiner plates grind the lignocellulosic material to the desired pulp grade. The mill oper...

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Problems solved by technology

While the ozone layer in the stratosphere helps absorb most of the UV radiation that reaches Earth from space, ozone gas (O 3 ) is still a strong oxidant that is toxic to the human body

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