Improvements In Small Scale Coal Combustion Plant - Development Of High Efficiency Cyclone Grit Arrestors: Project Summary

Abstract:

<p>The aims of this project were:<bl> <li>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.</li> <li>To control particulate emissions rather than improving the combustion rates of poor quality coals.</li> <li>Cover the commercial and industrial segments with a range of boiler outputs from 0.6 MW_th - 6.5 MW_th.</li> </bl></p> <p>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.</p> <p>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.</p> <p>The conclusions from this project are: <bl> <li>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.</li> <li>For all the tests and all three-test coals the stack emissions were less when the blow down system was in operation.</li> <li>Generally, the tests indicated the lowest stack concentration at blow down rates of around 10% under medium firing rates.</li> <li>Under high firing rates the tests indicated the lowest stack concentration at blow down rates of around 20%.</li> </bl></p> This summary provides information on: <bl> <li>Objectives</li> <li>Summary</li> <li>Background</li> <li>Cyclone Design and Testwork</li> <li>Conclusions</li> <li>Potential for Future Development</li> <li>Cost</li> <li>Duration</li> <li>Contractor</li> <li>Collaborators</li> <li>Further Information</li> </bl>

Author(s):

DTI