Cel
This project is a logical extension of our previous research (PS 362) coordinated with three other European research projects on nitrogen oxides in steel-making (PS 363/PS 366/PS 367). The project is in two parts:
-measurements of NOx emissions in various coking plant sectors, with particular emphasis on the effect of the operating procedure;
- a study of the impact on the environment of NOx emitted by coking plants.
The test results have shown that the main part of nitrogen oxide discharges comes from the underfiring waste gases. In many cases, it is possible to reduce these emissions to an acceptable level:
- either by adopting new technologies, such as coke ovens with staged combustion and waste gases recirculation, where an average level of 300 mg per m{3} of waste gases (with 5% oxygen) has been noted for a high battery temperature (in the region of 1350 C)
- or by optimizing the combustion story in the heating flues, by reducing temperature heterogeneities along the height
- or by underfiring coke oven gas.
The nitrogen oxides emitted by two special installations -ammoniacal water incinerator and continuous carbonization rotary kiln- could be also reduced by determining the optimum working conditions.
In order to complete the balance of nitrogen oxides emissions in cokeplant, a succession of measurement campaigns in the environment of an isolated cokeplant has allowed to establish the impact of such emissions on the ambient air quality.
Finally, a study of seasonal variations of NO and NO2 concentrations in the environment has allowed to confirm past works on the pollution by nitrogen oxides, namely a rapid transformation of NO in NO2 in summer under the influence of ultra-violet radiations, this reaction being much more reduced at short distance in winter.
Generally speaking, we can say that the responsibility of a cokeplant towards nitrogen oxides is high in a range of 2000 to 3000 m of the emitter, although a plume impact may be felt at larger distances, up to 5000 m of the origin.
It will be necessary to study the impact on the environment of emissions of nitrogen oxides by coking plants in the following three phases:
Phase 1:
Study of the levels of pollution by NO, NO2 and their derivatives around an isolated coking plant. Establishing the degree to which the plant is responsible for emission.
Phase 2:
Study of the conversion of NO to NO2 or other compounds (nitrates, organic nitrate products, etc.).
Phase 3:
Study of the likelihood of the steelmaking and coking plant environment converting NO to NO2 and its derivatives: study on an isolated coking plant and on an integrated coking plant.
Temat(-y)
Zaproszenie do składania wniosków
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57612 Forbach
Francja