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Treatment of exhaust gases from cement clinker production

A technology of cement clinker and exhaust gas counterflow, applied in gas treatment, membrane technology, dispersed particle separation, etc., can solve the problem of not completely solving the problem of purifying exhaust gas

Inactive Publication Date: 2018-01-02
HEIDELBERGER ZEMENT AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The goal of purifying exhaust gases from cement production, where ever-decreasing limit values ​​need to be met and where cost and energy requirements remain acceptable, is thus still not fully resolved

Method used

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  • Treatment of exhaust gases from cement clinker production
  • Treatment of exhaust gases from cement clinker production
  • Treatment of exhaust gases from cement clinker production

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Embodiment Construction

[0042] figure 1 The method steps are shown. Solid material flow is shown by solid arrows and gas flow by hollow arrows. The raw materials are ground in a mill in a known manner. The raw meal produced is fed to a preheating step, where in the raw meal silo, a storage step is usually in between. Preheating may include precalcination. The preheated and optionally precalcined raw meal is supplied to a rotary kiln where it is burned to form cement clinker. Subsequent steps of cooling, grinding, etc. are not shown. Fuel is supplied (dashed arrow) and burned to burn raw meal in the kiln. Nitrogen oxides are produced here and in the entire thermal area of ​​the kiln from oxygen and nitrogen. In the kiln, air flows counter-currently to the raw meal so that hot exhaust gases containing nitrogen oxides and other pollutants leave the kiln at the point where the raw meal is fed. From there it is directed towards a pre-heating step where the reagents for SNCR are mixed according to t...

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Abstract

A method for the treatment of exhaust gases from the production of cement clinker in a rotary kiln, in which raw materials are ground in a mill to form raw meal, raw meal is preheated in a counterflowconfiguration in a preheater with exhaust gas from the rotary kiln and is optionally pre-calcinated, preheated and possibly pre-calcinated raw meal is supplied to the rotary kiln and is burned in therotary kiln to form cement, the exhaust gas from the rotary kiln is, before entering the preheater, denitrogenized by way of selective non-catalytic nitrogen oxide reduction with a reagent which provides ammonia, and wherein, according to the invention, the exhaust gas from the preheater is subjected to gas conditioning and catalytic oxidation of ammonia. The object is furthermore achieved by wayof a device for gas conditioning and catalytic oxidation, which device is arranged between preheater and mill.

Description

technical field [0001] The present invention relates to a method and a device for treating exhaust gases generated during the production of cement clinker in a rotary kiln. Background technique [0002] Cement production by burning raw meal to form clinker requires high temperatures at which the formation of various pollutants, especially nitrogen oxides, cannot be prevented. In view of the ever-lowering limit values ​​for pollutant emissions, various methods have been developed to remove them from exhaust gases. The following proposals demonstrate the state of the art, especially with regard to denitrification. [0003] The first method involves the conversion of nitrogen oxides, namely NO and NO, using ammonia or urea solutions, typically at 900 to 1000°C 2 , which are collectively referred to as NO x . This approach is called Selective Non-Catalytic Reduction, or SNCR for short. An example of such a method is WO 2012 / 17616 A1, which describes a method in which ammoni...

Claims

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Application Information

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IPC IPC(8): B01D53/56B01D53/86C04B7/36
CPCB01D53/8634C04B7/364B01D2255/20723B01D2255/20738B01D2255/20776B01D2258/0233B01D53/56
Inventor S.费德亨
Owner HEIDELBERGER ZEMENT AG
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