Cement, Energy and Environment

- Figure3. CKK system and SP tower seen from ground level. Construction costs By introducing the CKK System, construction cost and the period of construction work can be reduced over a conventional MSW facility, since pre-treatment equipment such as waste separator, facilities for sewage and ash treatment are no longer necessary. Construction cost for CKK system is one third to one quarter the cost of the dedicated MSW disposal facility in China, and less than one tenth that in Japan. In January 2010, the first CKK System was introduced into Conch Cement's Tongling Plant located in Anhui Province, China. The capacity for MSW treatment is 600 tpd (2x300 tpd gasification furnaces) for two clinker production lines with 5000 tpd capacity. Furthermore, a scheme under which the City of Tangling pays Tangling Conch a commission for waste processing is proceeding according to plan. Fuel consumption a Tangling Conch's cement plant has improved while the company receives a supplemental revenue stream from the commission. The CKK System was nominated as the world's highest environmental conservation technology by the United Nations Industrial Development Organization (UNIDO) for its Blue Sky Award . Finally, meeting both of the following conditions has been key the project's success. 1. Is there a cement company willing to accept waste , which is a precondition for the system's viability? 2. Is local government prepared to pay for waste processing? It is hoped that this article will lead readers to begin to examine the possibility of realizing their own similar projects. Courtesy: World Cement, October 2010, Pp 61-64. RDF IN CEMENT MANUFACTURE The use of alternative fuels continues to increase worldwide, providing a substantial fuel cost saving and some very useful environmental benefits. This overview from Italian specialists Satrind examines some of the options and the equipment used to prepare RDF for kiln firing. Satrind SpA, Italy This article first appeared in International Cement Review in July 2010 and is reprinted with kind permission of Publication Ltd, Kingdom. Tradeship United Email: info@CemNet.com Website: www.CemNet.com Nowadays, the cement industry has important responsibilities environmental because the cement manufacturing process requires high temperatures which consume about 10 times more energy than the average amount required by any other industry. The average energy required to produce 1 tonne of cement is equivalent to the combustion of approximately 120 kg of coal. The industry has a great responsibility to manage the environmental impact required in the production of cement and, employing waste as alternative fuel instead of the traditional fuel has solved some environmental aspects and problems. Today, many plants derive up to 70 per cent of their energy from alternative fuels. Although cement companies have traditionally burned coal, petcoke, and other fossil fuels in cement kilns. many of them have turned to alternative fuels, considering that the use of these fuels substitutes approximately 3Mt of coal every year. The thermal energy obtained from residues allows a saving in conventional fuels and is compatible with the principles of sound environmental practice for two reasons: • In terms of manufacturing cement process the alternative fuels and raw materials contribute to reducing emissions of gases 65