Posted by bobby4 on ADVFN (Part 2)17 Aug 2018 10:44
Also the company states they are working with ceramics with temperature of 1500c plus, the problem here is the stability of the ceramic at that temperature to the application required. In theory the process works, in practice it has tremendous problems.
DJR: Ceramics are, indeed, a challenge, hence we are working with alternative, semi-exotic materials that have proven to be both reliable and effectively impervious to caustic erosion within the temperature envelopes in which we operate.
I know many think this is the best thing since sliced bread, unfortunately it is not.
DJR : I cannot comment on personal beliefs.
Over the many years of developing the Pyromex technology it was tested at various temperatures upto 3000c, but 1500c is a good working tempreture as all waste will gasify at 1500c. It was run continuously for the maximum of 10 hours at various times. A large range of different materials were used including ceramics to try and solve the problem or rather to find an acceptable balance in which the theory of the technology could be developed in such a way to make the technology a commercial reality. The problem being that reactor core destroys itself throughout the operation.
DJR : We concur regarding the Pyromex technology. Material science has moved on quite substantively since their unit was constructed. See above.
Finding a material that can give a balance to make the technology commercially viable is the goal.
DJR : Agreed, we have undertaken sophisticated modelling, bench testing, validation proving, and extensive in situ testing, in the G3 Research Demonstrator at Thornton Science Park to identify operating regimes and material selections for each feedstock presented to us by potential customers. We have now designed a commercially viable process.
Having said that the major problem as I have said before is the oxygen in the waste being gasified, as an oxygen free atmosphere has to be maintained at all times otherwise at 1500c a dangerous situation could occur.
DJR : For such a hazardous environment situation to arise, we would need to be feeding in neat oxygen into the chamber at a significant rate, rather than the oxidising agents we are feeding. This is not an operational case. Both our empirical experience in the Demonstrator, and the scientific data derived therefrom, support our premise of operation and its safety.
I personally feel that the balance needed for this technology to progress is unattainable.
I think jaknife puts it overall quite well. For PHE it is a dream to come true, but the directors must know it will never be achieved, as they must know the downside but only want to listen to the upside. It is like a drug, once you are hooked, for various reasons you cannot walk away. However in this case, innocent people get hurt."
DJR : (See Par 3)