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Content archived on 2022-11-21

Reducing CO and Nox emissions from coking ovens by means of a novel, composite heating system

Objective

The objective of the study is to obtain mathematical tools which will not only permit innovative new designs for flues (and so increase the safety margin at the planning state), but will also make it possible to improve heating conditions in existing systems by making fuller use of the scope for adjustments.

Discussion of the greenhouse effect and more extensive knowledge of the effects of pollutants on man and nature have increased awareness with regard to the environment. An obvious consequence of this has been the introduction of more stringent requirements concerning the limitation of pollutant emissions which have subsequently shown up the shortcomings of the heating systems used for the various types of coking oven.

The production targets which operators have to aim at for economic reasons mean that conventional heating systems increasingly cannot fully comply with requirements in respect of environmental and labour protection.

The primary cause of this situation is the extreme complexity of coking oven heating systems. The main problem with coking ovens is that the lack of individual flow control for the large number of ceramic-lined combustion chambers prevents controlled regulation of effluent flows.

The project will concentrate on the following points:

A) Assessment, status of knowledge, planning

Planning of a modular model system based on a systematic analysis and evaluation of experience, findings and operational data as well as of information on possible measures to reduce CO and NOx emissions from coking oven heating flues, e.g.

- stage combustion, staged air supply
- internal flue gas recirculation, circular current
- external flue gas recirculation.

B) Model studies

1. Construction of a modular model system for experimental flow and mixing studies.

2. Flow studies on models or part-models to establish optimum speed and mixing conditions in the coking oven heating flue.

3. Numerical simulation exercises covering flow, mixing and combustion processes in the model system.

C) Operational tests

1. Measurement of temperatures and concentrations in the heating flue, particularly CO release and NOx formation.

2. Application of the model results in the practical design of the new type of heating flue.

3. Control measurements under operational conditions to quantify the combustion process in the new flue.

Call for proposal

Data not available

Funding Scheme

Data not available

Coordinator

Ruhrkohle AG
EU contribution
No data
Address
Rellinghauser Straße 1
45128 Essen
Germany

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Total cost
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