Apparatus and method for the production of cement clinker
AssigneePolysius AG
InventorsRichard Erpelding, Guenter Driemeier
Life of this patent
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Abstract
Apparatus and method for the production of cement clinker, wherein raw meal is preheated in a heat exchanger and is burnt in a kiln to form cement clinker and the exhaust gases from the kiln flow in succession through the heat exchanger and a catalytic converter, wherein the exhaust gases are analysed before and/or after the catalytic converter arid the preheated raw meal is precalcined in a calciner. Moreover, for the subsequent catalytic exhaust gas purification the provision of a calciner has the advantage that higher exhaust gas temperatures are produced so that a throughput is produced. As a result the required volume of the catalytic converter is reduced and the investment costs are lowered.
Claims14
Apparatus for the production of cement clinker with
- a heat exchanger for the preheating of raw meal,
- a kiln for the final burning of the cement clinker, wherein exhaust gases from the kiln flow through the heat exchanger,
- a catalytic converter, disposed in the direction of flow of the exhaust gases after the heat exchanger, for reaction of NO with CO, and
- means for the analysis of the exhaust gases before and/or after the catalytic converter,
- the apparatus further comprising a calciner for precalcination of the preheated raw meal, the calciner having an additional combustion chamber through which the exhaust gases from the kiln do not flow.
Method of producing cement clinker, wherein raw meal is preheated in a heat exchanger and is burnt in a kiln to form cement clinker and exhaust gases from the kiln flow in succession through the heat exchanger and a catalytic converter, and the exhaust gases are analyzed before and/or after the catalytic converter, and wherein a catalytic converter reaction of NO with CO is used, and the CO content is tailored specifically to the catalytic converter by the combustion conditions in the calciner and/or by the addition of further fuel wherein the preheated raw meal is precalcined in a calciner, a reducing agent, comprising an ammonium carrier and/or a hydrocarbon, being introduced in the region of the calciner and/or the heat exchanger, and the quantity of reducing agent to be introduced being adjusted according to the analysis of the exhaust gases measured before and/or after the catalytic converter.
Dependencies are inferred from the claim text.