Cement, Energy & Environment Jan-Mar 2002

• • • • kiln firing. The grinding system should have flexibility for preparing the pet coke to a satisfactory level. The calciner may need modification to ensure sufficient re tention time and mixing conditions for complete burn– out of pet coke. Replacement of conventional burner by modern multi-channel burner and upgradation of primary-air fan seem essential to generate high primary-air velocity in the burner. Leading machinery suppli ers have modified designs of calciners and kiln burners to achieve satisfactory burn-out of pe t coke. D1e kiln operating cond itions have to be • • optimized to reduce s ulphur • volatilization from the burning zone and consequent build-up problems in the riser duct. The optimization measures include maintaining sufficiently higher oxygen in kiln and calciner. Anumber of Indian cement plants have been using pet coke as a substitute for coal to varying percentages and overcome various practical problems over a period of time. The extent of pet coke utilization is still on the lower side compared to the practice abroad. There is a lot of scope for increasing the utilization, thi s however requires modifications in the systems with capital investment. The extent of utilization of pet coke will depend on its sulphur content, the amount of alkalis present in the raw materials, the tolerable limits of sulphate m clinker and the degree of volatilization from the buring zone. Higher S0 3 contents in OPC up to 3.5 per cent are reported to have not shown adverse effect on setting time, soundness and strength development. • . INTERNATIONAL EXHIBITION ON ENERGY AND ENVIRONMENT IN CEMENT PRODUCTION, NEW DELHI A four-day Technical Exhibition on Energy and Environment in Cement Production was held to coincide with the Interna tiona! Exhibition and Semin ar on En e rgy and Environment in Cement Production and Sustainable Construction, jointly organized by the National Council for Cement and Building Materials (NCB) and the Cemen t Manufacturers' Association (CMA) in New Delhi during 28-31 January 2002. The Exhibition was inaugurated by Shri S. Jagadeesan, Jt. Secretary, Ministry of Commerce & Industry. A total of 11 exhibitors participated in the Exhibi tion and displayed their products and services. The exhibits spre<1d over16 s t<1Jis included equ ipment, models, components, instruments, samples, charts, photographs and publications . There were video presentations too. 9