UKERC EDC: Publications

DTICC411_file19919.pdf

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Abstract:

The specific objectives of the project are:

To demonstrate the performance of a full-scale burner capable of utilising difficult coals (i.e. low volatile content and/or high inert content) with regard to NO_X emission, combustion efficiency, turndown without oil support, and flame stability.

To obtain characterisation data for difficult coals, and to apply this data in improved combustion models.

In-furnace NO_X reduction technologies, and low NO_X burners in particular, are considered mature for application to a wide range of coals. However their performance deteriorates with the more 'difficult' coals; i.e. low volatile coals (<10% daf) and those with high levels of moisture and/or high levels of inert materials. Such coals are being utilised increasingly in large export markets such as Eastern Europe, India, Asia and the United States. The problem with difficult coals is in achieving a stable performance with low emissions and efficient combustion. For example, the presence of high levels of moisture causes a delayed ignition resulting in the flame front not being stabilised within the burner throat as is normal with bituminous coals. Consequently, the burner is significantly less effective in controlling both NO_X emissions and combustion efficiency. The presence of high ash compounds this problem.

The proposed project aims to develop and demonstrate a new burner type capable of firing a range of difficult coals, at full-scale in a single burner test facility. The development phase will employ advanced modelling techniques for investigation of the effects of ignition, devolatilisation and burnout behaviour for difficult coals. This will be combined with detailed coal characterisation data. Burner design and performance implications as a result of integrated CO₂ capture options will be considered.

This profile contains information on the project's:

Objectives

Summary

Cost

Duration

Lead Contractor

Collaborators

Publication Year:

2005

Publisher:

Department of Trade and Industry

DOI: