UKERC EDC: Publications

DTICC216_file20065.pdf

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Abstract:

The aims of this project were:

To develop a high efficiency cyclone grit arrestor suitable for retrofitting to existing coal-fired boilers. This would enable existing coal-fired boilers to meet future emissions limits in terms of particulates.

To control particulate emissions rather than improving the combustion rates of poor quality coals.

Cover the commercial and industrial segments with a range of boiler outputs from 0.6 MW_th - 6.5 MW_th.

This project is concerned with the design and demonstration of a high efficiency cyclone grit arrester which could potentially achieve a particulate collection efficiency of in excess of 98%, making it suitable for reducing the emissions from boilers of this size and type.

The successful particulate and emission reductions would enable coal to be a viable fuel for heating and process applications in the smaller range of boilers in terms of environmental acceptability.

The conclusions from this project are:

The results exceeded expectations in terms of measured particulate emissions with low rates being achieved in both high and medium fire tests, significantly below the 150 mg/m³ proposed in the small combustion plant directive.

For all the tests and all three-test coals the stack emissions were less when the blow down system was in operation.

Generally, the tests indicated the lowest stack concentration at blow down rates of around 10% under medium firing rates.

Under high firing rates the tests indicated the lowest stack concentration at blow down rates of around 20%.

This summary provides information on:

Objectives

Summary

Background

Cyclone Design and Testwork

Conclusions

Potential for Future Development

Cost

Duration