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Hot gas cleaning using advanced ceramic Filter technology for municipal waste incinerators

Risultati finali

The encompassing result of this project is to have pioneered the successful application of nano-particle coatings to ceramic filter candles for use in high temperature gas filtration applications. The principle application of this technology is for processing exhaust from Municipal Solid Waste (MSW) incinerators, reducing the emission of harmful organic compounds, reducing operating costs and increasing the potential for heat recovery and the generation of electricity. The importance of nano-particle coatings and membranes is that they enhance, or more fundamentally, enable the re-cleansing of filters. Nano coatings were successfully applied using two methods. One method used dispersed nano-particles applied by a special technique and the other created them and applied them using a novel atmospheric pressure plasma. The techniques were developed by ITC and EATL respectively. The project undertook further development of these methods and made an in depth study of the morphology of the coatings they produce. Using a model dust which accurately mimics the common MSW fly ash characteristics, the project undertook credible laboratory studies significantly advancing knowledge of the filter cake formation and removal mechanisms. IEPE have shown that the coatings applied with APNEP to their ceramic fibre filter candles enhanced re-cleaning and indeed reduced the pressure drop during the filtration process by 57% as compared with non-coated filters. IEPE has also shown that particle conditioning with calcium sulphate resulted in improved filter cake detachment. This treatment could be applied on an industrial scale. Mathematical modelling of the dust cake build up and removal mechanisms enabled a clearer understanding of the gas dynamics required to clean hot gas filters in-situ. This has also enabled a more detailed theoretical study of the detachment of dust cake using the novel vacuum pulse technique developed by ITC. Experimental methods of measuring the adhesion and detachment forces of filter cake on samples, with and without coatings were successfully developed by ARCS. The device is now ready for use in a follow on project or related adhesion test studies. The project has demonstrated that nano-coated grain and fibre ceramic candles can be successfully cleaned by jet pulse, vacuum pulse or coupled re-cleaning (CPP) even after filtering an exhaust representative of MSW emissions at 650 degrees Celsius.

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