1156 posts
Fuels Question 23
We are having Polysius design ILC six-stage kiln have dimension of 3.8m ID and 64m length. We are firing 100 petcoke in both main firing and calciner firing. We are facing problem of reduction in output and percentage of fines generation in clinker increased.The kiln feed and petcoke chemical analysis are as under: SiO2 13.80 - 14.10 Al2O3 3.6 - 3.75 Fe2O3 3.4 -3.6 CaO 42.7 - 42.9 MgO 0.7 - 0.9 SO3 0.1 -0.16 K20 0.28 - 0.35 Na2O 0.10 - 0.12 Cl 0.06- 0.09 Petcoke Analysis C 88.5 - 89.5 H2 3.8 - 4.2 S 6.0 - 6.5 Violatile Content 9.8 -10.4 Calorific Value 7960 - 8020 Kcal/Kg Coal Ash Content 0.30 - 0.70 Please suggest suitable counter measures to increase throughput rate and stable running of kiln.
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1156 posts
Re: Fuels
Unfortunately these problems are regularly reported on kilns burning petroleum coke. The problem is caused by the sulphur content in the petroleum coke. This has the effect of reducing the viscosity of the flux and this leads to the increased fines generation in the clinker. You must ensure that you have good oxidising conditions in the burning zone to minimise the recirculation of sulphates. After that you need to change the chemistry to adjust the viscosity of the flux. Increasing the Al2O3 content may help, but perhaps the best solution would be to add some calcium fluoride to the kiln feed.
1156 posts
Fuels Question 24
We are one of the leading manufacturer of gas plant in India. We would like to know the following: How oxygen enrichment is beneficial in cememt industries? Do you have any information that any cement industries has opted for oxygen enrichment ?
1156 posts
Re: Fuels
Oxygen enrichment of the combustion of a cement kiln is useful because it reduces the volume of the exhaust gases freeing additional capacity in the fan to produce additional output. The oxygen is required for the combustion in the cement kiln. The amount of oxygen required depends on the capacity and process of the cement kiln. It is about 120 tonnes per day for a 1 million tonne per year kiln.