energy efficiency in the cement industry

[...]... the energy savings The high-pressure grinding rolls now offer a further chance to save energy, especially in cement grinding So far three procedures have mainly been tested, a) Pre-grinding in high-pressure grinding rolls b) Hybrid grinding (partial or complete return of the oversize material after ball mill to the high-pressure grinding rolls and fine grinding in a ball mill) c) Grinding cycle with... t The most important process stages where energy savings are constantly sought are a) the preparation (combined drying and milling) of the raw material components, b) the burning of the kiln feed to cement clinker and c) the preparation (milling) of the clinker to cement Under the headings a) energy savings through product innovation b) energy savings through process optimization and c) energy savings... advanced rotary kilns and the shutting down of old kilns the fuel consumption in the Federal Republic fell from 4.8 GJ/t of cement in 1960 to 3.0 GJ/t of cement in 1988 To a limited extent, energy savings are today possible by the use of secondary constituents in cement grinding or by optimizing the process technology in the preheating, burning and cooling of the cement clinker The technological possibilities... CO2 emissions Another path suggests a way of controlling energy consumption and its environmental impact whilst maintaining economic growth in other words, meeting the challenge of sustainable energy growth In the months ahead, the Commission will refine its analysis, taking into account the reactions in the Community and Internationally, to this document However, the preliminary findings were already... a secondary grinding in a ball mill by some 1,500 cm2/g is nowadays still necessary (5) Fig 3 shows the energy demand of the grinding methods mentioned in dependence on the specific surface area (5) The dashed lines relate to the secondary grinding in a ball mill of grinding feed from highpressure grinding rolls operated in closed-circuit The figure indicates that to grind cement to a fineness of some... ON THE THERMAL PROPERTIES OF BUILDINGS This legislation is still at the review stage, and is in the hands of various Ministries involved The legislation represents the first step towards standardisation of the regulations for buildings with the aim both of lowering the heating and cooling requirements and of improving the quality of the environment With this in mind, are plans for cheking the minimal... principle, the use of secondary constituents 22 ENERGY EFFICIENCY IN THE CEMENT INDUSTRY instead of clinker brings about significant savings in fuel energy as well as electrical energy in the clinker production On the other hand, cements with secondary constituents have to be ground to a greater fineness than a portland cement of the same strength class Furthermore, the secondary constituents must be dried... on the separation efficiency of both lower cyclones Savings in electrical energy The main part of the electrical energy requirements is accounted for by the milling of the cement (3), in addition, the preparation of the raw materials and the burning of the clinker are also of importance (s table 5) Table 5: Mass-related electrical energy requirement for the production of cement in the FRG (Source: Bundesverband... manufacture of cement is very energy- intensive Already in the past great efforts have therefore been made to lower the energy consumption in the manufacture of cement (1) By using advanced rotary kilns and shutting down older kilns the fuel consumption fell for instance from 4.8 GJ/t of cement in 1960 to 3.0 GJ/t ENERGY OUTLOOK IN WEST-GERMANY’S CEMENT INDUSTRY 21 of cement in 1988 Due to a greater degree... drop in the emission of CO2 into the atmosphere of around 6 million tons annually Such an increase in energy efficiency will have repercussions in the balance of payments and will lead to improvements in the quality of the environment; there will, moreover, be an increase in the competitiveness of the economy in general To these results would have to be added the internal and external effects of these . growth. In the months ahead, the Commission will refine its analysis, taking into account the reactions in the Community and Internationally, to this document. However, the preliminary findings. signed in Paris in 1951. – The Treaty establishing the EUROPEAN ATOMIC ENERGY COMMUNITY (EAEC or EURATOM) was signed in Rome in 1957. Therefore, one could say that, from the beginning, the founders. technical and financial instruments for a concerted policy of energy efficiency, set up with the consumer in mind. The first element which ties these instruments together is the fact that they aim