Cement News tagged under: Tech Forum
Gaseous emission control12 December 2012, Published under Cement NewsWith acid gas emissions being one of the topics of this ICR issue Dr Clark reflects on previous Technical Forums on this subject and the latest offerings from WL Gore in this regard. WL Gore deNOx technology The control of the acid gas emissions NOx and SO2 is periodically discussed in the Technical Forum along with the control of other gaseous emissions such as unburnt hydrocarbons, dioxins, furans, mercury and other heavy metals. The chemistry underlying the origin and mitigat... |
Top-cycle heat recovery15 August 2012, Published under Cement NewsWith the publication of an article on the Holcim Lägerdorf kiln in this month’s ICR, Dr Michael Clark muses on the mass and energy flows of such a semi-wet kiln system, even speculating that there will be differences in those energy flows required in winter and summer. Holcim Lägerdorf is the starting point of this month’s Technical Forum’s foray into mass and energy flows of semi-wet kiln systems Recent Technical Forum articles have largely been focused around the cemen... |
Automation for Africa18 July 2012, Published under Cement NewsThe importance and desire for automated systems in a cement plant in the developing world has to be balanced with the need of helping local employment and training staff in the understanding of process control. It is perhaps not the easiest of challenges to reconcile but the use of statistical process control could teach and advise employees of the best way to run the factory, supported by expert systems to assist correct adjustment decision-making. Cement factories in Africa now have... |
WHR on the rise06 June 2012, Published under Cement NewsDr Clark takes the theme of waste heat recovery for this month’s Technical Forum and investigates current available solutions for the cement industry. He also touches upon current themes around the topic, such as is it an attractive option for your plant? When to install the technology? And how best to use the waste heat that is generated? The organic Rankine cycle method of WHPG is efficient with regard to utilisation of low- and medium-temperature waste heat, whereas steam-based... |
Balancing volatile behaviour28 May 2012, Published under Cement NewsFollowing on from last month’s Technical Forum about the impacts of alternative fuels and raw materials, Dr Michael Clark examines the effect on kiln emissions, using the mass balance of the cement kiln as a starting point. Metallic mercury and mercury compounds are too volatile to pass down the preheater into the rotary section of a kiln What goes into the cement kiln must either come out in the clinker product or the emissions from the kiln, or it must be retained and built... |
Online analysers21 March 2012, Published under Cement NewsDr Clark takes the theme of online analysers for this month’s Technical Forum, reviewing the history of these devices in the cement industry and speculating as to how their deployment may increase in the future. FLSmidth's KilnLoq system is a probe that gathers gas data from the kiln inlet One of the main themes of this month’s ICR is online analysers, which also makes a good topic for this month’s Technical Forum. Online analysers have a long history in the cement manufacturing... |
Essential services03 January 2012, Published under Cement NewsDr Clark reviews the consumption of the essential services of electricity, water and compressed air in a cement factory and concludes that many would benefit from a rigorous review of the use of these key inputs. In cement manufacturing and the Technical Forum we are very much concerned with the raw material and fuel inputs to the cement manufacturing process and also the process and processing equipment itself. However, none of these inputs or equipment could succeed in the manufact... |
How to burn more secondary fuel05 December 2011, Published under Cement NewsThe trend towards ever-higher substitution rates of noble primary fuel by waste-derived secondary fuels has been strong for some decades already and still there is no sign for this trend to weaken [1]. However, the spectrum of chemical and physical properties of secondary fuels is vast and also ever changing due to local and periodical variability [2]. Some projects have fallen behind their expectations and the lessons learned are that high substitution rates are not easy to achieve, as disc... |
Strange things in strange places22 November 2011, Published under Cement NewsThere are several mysterious build-ups of mineral deposits in cement kilns that Dr Clark can refer to from his experiences While the cement manufacturing process has a long history and the machinery and controls that now exist on modern precalciner kilns enable stable production of consistent product, it is not so uncommon for some peculiarities to arise over time, such as unexpected mineral build-ups. Dr Clark is asked to explain the presence of such occurrences in kilns. ... |
Rock solid support24 October 2011, Published under Cement NewsDr Clark ponders the reasons for renewed interest in the quarry chemistry control and decision support system first presented in the February 2002 edition of International Cement Review. Cement producers need to limit variation of raw materials by introducing controls During the last year Whitehopleman has experienced revived interest in the quarry chemistry control system which we first wrote about in the February 2002 edition of ICR. Why this rekindling of interest in such a s... |