Stones & Soils
By means of a gradated fuel addition in the secondary firing in the pre-calcinator NOx emissions are reduced during the production of clinkers. Part of the fuel is added to the exhaust gas before entrance into the calcinator in the form of coal dust, which burns incompletely due to stoichiometric conditions. Thus NOx formed in the furnace is reduced by CO. The second part of the fuel is added together with tertiary air, the exhaust gas stream is mixed in a centrifugal chamber for better oxidation of the CO. The NOx emissions were reduced from over 1000 to approximately 800 mg NOx/m³. In the case of the other emissions no significant change resulted.
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Reduction of the nitrogen oxide emissions in long-term operation at a gas heat exchanger furnace plant for the production of cement clinker
The NOx emissions of the gas heat exchanger furnace of a cement plant should be decreased with the help of the non-catalytic reduction (NCR). With the demonstration plant it could be proven in long-term continuous operation that a furnace exhaust concentration value of 0.80 g/m3 can be kept.
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An enterprise of the building material industry realized a new module brick work for high-temperature insulation plan bricks with a completely new drying and baking concept, whose technical innovation consists of the fact that the baking material is flowed through by hot gases during the drying and baking process. This flow-through is to shorten the conventional drying time of the bricks of approx. 48 hr. to 6 hr. during a one-layer high-speed drying process and to reduce the baking duration to 4 to 5 hr. by application of a role furnace.
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Source:
Federal Environment Agency (UBA)
Categories:
Structural effects upon asphalt properties associated with the use of the recycled polymer modified asphalts and asphalts containing admixtures
In a laboratory trial, asphalts mixed with recycled asphalt have been compared with conventional asphalts. No clear effects upon compacting resistance and cracking behaviour have been established. Deformation behaviour has proved to be more satisfactory than that observed in the control mixtures.
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Supercritical carbon dioxide is faster
High-performance ceramic components can now be produced with a high degree of accuracy using an innovative and environment-friendly process. This is made possible by supercritical carbon dioxide. The latter can be used as a highly effective solvent for the dissolution of bonds, thereby allowing the completion of material cycles, the reduction of emissions and the avoidance of wastes. In comparison with conventional methods, energy consumption is reduced by some 20 percent. Further information is contained in the project-description.
Systematical support of an Environmental Performance Indicator System by an Environmental Management Information System
Using the example of an industrial glass manufacturer, a system of characteristic environmental values has been developed and implemented within SAP R/3. This system incorporates the acquisition of data from various DP source systems, the integration of characteristic values into the SAP R/3 EIS module and the representation of these values in quantitative terms, together with their associated costs.
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Thermal recovery of mixed plastic wastes: Optimisation of processes for the environmentally acceptable recycling of waste materials. Subprojekt 1
On the basis of waste analyses, a procedure for the separation and treatment of substantially non-recyclable plastic wastes was developed in order to use the resulting product as alternative fuel in cement works.
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Thermal recovery of mixed plastic wastes: Optimisation of processes for the environmentally acceptable recycling of waste materials. Subprojekt 2
It was possible to realise an incineration process for the non-polluting incineration of plastic wastes. This thermal utilization saves landfill space and improves CO2 levels. It is possible to save fossil fuels and maintain the quality of the product thereby.
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