Cement News tagged under: Manufacturing technology
'Mach 2" for vertical mills14 May 2012, Published under Cement NewsSiemens has recently launched two new compact solutions for the optimum and energy-efficient driving of vertical roller mills (VRM) for the cement industry. The Flender MultipleDrive offers variable-speed drive and the EMPP drive provides a compact motor-in-gear solution for modern, high-performance milling. Ali Kemal Kücükyavuz, Steffen Brun and Franz Schmeink of Siemens AG, Germany, explain the benefits. Siemens has developed a new modular drive solution, the Flender MultipleDrive, ... |
MACT compliance: back to basics03 May 2012, Published under Cement NewsFundamental changes are taking place in the US cement industry with regards to emissions control regulations or Maximum Achievable Control Technology (MACT) which will lay the foundations of standards in the next century. With such complex legal requirements now being placed on US cement producers it is essential that they are fully aware how to become MACT compliant. DR Uhr of Ducon Technologies Inc, USA, explains. Standard Technology, Potential MACT: inlet gas is hot, containing m... |
XMPP revisited03 May 2012, Published under Cement NewsIn May 2011, ICR published “Service-oriented architecture,” describing cloud computing services and service-oriented architecture for process control. Since this first publication, the information evolved into a formal IEEE working group with a joint liaison effort between ISO/IEC/IEEE 21451-1-4 for use of XMPP for Smart Transducers. William J Miller of MaCT, USA, charts its progress. Figure 1: IEEE P1451.1.14 (control and data plane) SOA XMPP (Extensible Markup and Presenc... |
Bypassing challenges30 April 2012, Published under Cement NewsMany bypass systems have been installed in cement plants worldwide during the past two decades, often triggered by the local raw material situation and also by an increased utilisation of alternative fuels or raw materials. With the cement industry’s experience in finding new solutions to optimise its processes, the main technical questions such as removal efficiency, gas and dust treatment have been solved satisfactorily. Figure 1: coating tendency at certain chlorine and sulphur con... |
Using alternative raw materials18 April 2012, Published under Cement NewsThe changes made to the production process of a cement plant by utilising different alternative raw materials can not only alter the dynamics of how a plant operates but can also affect the cost of production and cause blending and handling problems, says Arthur Harrisson. The addition of supplementary raw material alternatives such as foundry sand can also add difficulties when seeking to achieve a sufficiently fine raw mix. Switching from limestone to alternative raw materials can a... |
From flue gas to green growth02 April 2012, Published under Cement NewsWhile cement producers such as Lafarge have made the commitment to significantly reduce their CO2 emissions, if higher reductions are to be obtained, the industry must find new, non-traditional ways of cutting back levels. The Lafarge Research Center has investigated the conversion of flue gas CO2 into micro-algae biomass. Figure 1: the PBR used in the trial is composed of five ranks of glass tubes. The photograph shows one side of the PBR with 15 loops identified for each of the fiv... |
Big coolers, big challenges07 March 2012, Published under Cement NewsWith an annual cement consumption of about 1.85bnt, China is by far the world´s largest cement market. This has created a demand for high-capacity clinker lines similar to those procured by the Anhui Conch Cement Company in autumn 2009 for its Wuhu and Tongling plants. While two lines have been erected and exceed their 12,000tpd design capacity, the third one is due to start up in April 2012. For the coolers of these new lines, Anhui Conch turned to Germany-based IKN. Dr Daniel Strohmeyer an... |
Resisting refractory wear27 February 2012, Published under Cement NewsAs a leading supplier of global refractories, Refratechnik Cement is always aware of new trends that may impact on refractory lifetime. It is constantly developing its products to adapt to chemical and thermal attacks in various parts of the pyroprocessing line, including all sections of the kiln, cyclones, precalciner and cooler. Stefan Schwarz of Refratechnik Cement GmbH, Germany, describes the issues at stake. Figure 1: alkali crucible test with K 2 CO 3 (1100 o C) Silicon c... |
Filters for NESHAP compliance31 January 2012, Published under Cement NewsThe implications of the National Emissions Standards for Hazardous Air Pollutants (NESHAP) in the USA are far reaching in their targeting to reduce emissions from cement plants to unprecedented lower levels. Filter technology of the highest quality will be required to achieve the emission reductions needed, as Gore has been examining. Chris Polizzi of WL Gore & Associates, USA, shows us the results. Figure 1: weighted average emissions from stack tests, 1998-2007, used to develo... |
Flame shape and quality30 January 2012, Published under Cement NewsArthur Harrisson investigates how burning and temperature in various types of kilns has an effect on the clinker produced and discusses different aspects of the burning process such as heating rate, maximum burning temperature, the burning time and the cooling rate to show their importance to clinker quality. Optical microscopy offers visual assessment of clinker quality In the cement manufacturing industry, people still tend to refer to the burner at the front-end of the kiln a... |