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LOW NOX-COMBUSTION IN COAL DUST FIRED CEMENT PLANTS

Objectif

The aim was to demonstrate low emission and high efficient coal dust combustion in rotary cement kilns by means of an improved high accurate coal dust feeding system. The investigations should be performed in cement and pilot plants, applying the following coal dust feeding systems.
* loss in weigh feeder, rotary feeder (existing installation)
* screw feeder and on-line mass flux measurement (new installation)
* horizontal star feeder and on-line mass-flux measurement (new installation)
* multi-cell dosing unit and on-line mass-flux measurement (new installation)
The influence of the dosing system on the operation of the rotary kilns and the resulting emissions should be investigated by means of data acquisition of the relevant operational parameters. Additional investigations in pilot plants for coal dust feeding should allow detailed investigation of the operational conditions of the new coal dust feeding systems, which couldn't be realised in production plants.
The influence of constant coal dust feeding on the operational conditions and the emissions of rotary kilns was documented throughout short term and long term data acquisition of the relevant operational parameters. Those values were compared to values of the existing coal dust feeding systems. The advantages of the new developed coal dust feeding systems in respect to the available systems are the following :
* short term dosing constancy is improved by factor 2-3
* due to constant coal dust feeding a more constant primary firing and kiln operation is secured
* pressure loss in the pneumatic conveying line could be reduced by 0.2 - 0.3 bar applying the equal mass flux of fuel. Thus an energy saving for the compressor of approx. 30% is possible.
* The energy savings for the operation of the new coal dust feeding system are > 50%
Due to a constant primary firing the excess air ratio in the kiln can be reduced. For constant operational conditions of the plant fluctuations of the emissions can be diminished. Investigations in a lime burning kiln with constant boundary conditions showed a reduction of the averaged NOx emission in long term of approx. 10% and a less fluctuations. For cement production plants the large internal circuits of materials as well as the oszillations of the system rotary kiln and clinker cooler have to be considered. The results of the last demonstration plant in Portugal will be submitted later. The combination of a high accurate coal dust feeding with new kiln control system or in the application of low Nox calciners will lead to a considerable reduction in NOx emission. By applying the new coal dust feeding systems in the demonstration plants it could be shown that the given limiting values for emissions are not exceeded, considering the type and amount of secondary firing in the plant future limiting values should be achievable. The dosing system works reliable and accurate under industrial conditions. It will be the bases for further primary NOx reduction measures. Up to now worldwide 40 of this new coal dust feeding system are in operation in cement plants.
The demonstrations were performed in three cement plants applying the new coal dust feeding systems:
* screw feeder and on-line mass flux measurement
* horizontal star feeder and on-line mass-flux measurement
* multi-cell dosing unit and on-line mass-flux measurement
During the demonstration test runs in the plants the following investigations had been performed.
* determination of state of art (CO2, CO, O2, NOx species concentration at kiln inlet, temperatures, etc.)
* determination of improvements obtained by applying the new technologies (CO2, CO, O2, NOx species concentration at kiln inlet, temperatures, etc).
In the demonstration project the achievements in reduction of emission and the improvements of kiln operation as well as the energy savings are stated. The results are documented in the final report.

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DEM - Demonstration contracts

Coordinateur

ATZ-EVUS
Contribution de l’UE
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Adresse
Kropfersrichter Straße 6-8
92237 Sulzbach-Rosenberg
Allemagne

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