This page contains a Flash digital edition of a book.

INSTITUTE OF REFRACTORIES ENGINEERS NATIONAL CONFERENCE 2014 REVIEW Institute of Refractories Engineers N Refractories for En

The National Conference was held at the Kenwood Hall Hotel, Sheffield, on the 8th

represented by the speakers.

The Institute President Mr Keith Andrews provided an opening address, chaired the morning and afternoon sessions as well as the AGM.

In the morning session the first paper (Material Design for New Insulation Concepts) was presented by Dr Andreas Buhr of Almatis. Andus is known to many people in the refractory community and his presentations are always thought provoking. His presentation centred on a material which Almatis have described previously, however there have been further developments. Bonite (from Hibonite, calcium hexaluminate) is available in dense and very insulating grades and now a low density version LD. The compositional thermal conductivity values (k, W/mk) are 0.5, 1.5 – 1.0 (LD) and 1.7-2.5 for the dense material. These materials can be combined in various amounts to give castables optimum properties and with inherent stability to H2

and CO atmospheres; insulation and stability will be applicable to a wide range of refractory applications.

Dr Sankar Kannabiran of Hoganus Bjuf (Denmark) presented a paper on “Refractories for Wood Chip Furnaces”, which

are popular

throughout Scandinavia, Canada, Austria and Germany. This “biomass” combustion is considered CO2

of October. It was a truly European event with four nations

The refractory lining has to withstand a considerable amount of alkali attack. Permeability is the key criterion to refractory survival and Dr Kannibiran demonstrated the resistance of a 50% alumina material to K2

CO3 at 1100°C; it was poor, a new

development with control of the matrix permeability under the same conditions showed no disruption. SiC addition at 55- 60% addition levels can also contribute to alkali resistance and inherently resist ash build-up. Basic materials tend to absorb alkali salts; this results in bursting. There are other considerations; sulphur reactions with hydraulic materials and acid corrosion of the anchors as HCl is generated in the process.

An example of a wood chip furnace operating at around 1300°C creates steam for turbines generating 27MW.

Peter Trane of Skamol (Denmark) presented the third paper of the morning session “Acid Resistant Insulation Materials”. With the increasing use of alternative fuels in many processes combined with the combustion of waste streams containing high levels of plastic, the acid levels in the flue gasses have increased dramatically. To prevent corrosion of steel shells and other steel elements in plant construction, the dew point of acids (HCl, H2

SO4 neutral, it generates

around 480 million tonnes of ash assuming 7 billion tonnes

of consumption. WWW.IRENG.ORG NOVEMBER 2014 ISSUE & HNO3 the Skamol insulation.

Peter explained that the Skamol deposit of diatomite was a 50 million year old marine sediment comprising algae skeletons and a plastic clay; it is close to the surface with only a 2m overburden.

) can be calculated and thus contained within

Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36