Download PDF by J. SIRCHIS: Energy - Efficiency in the Cement Industry

By J. SIRCHIS

ISBN-10: 0203215656

ISBN-13: 9780203215654

ISBN-10: 1851665463

ISBN-13: 9781851665464

This article offers the lawsuits of a seminar geared up via the CEC, Directorate-General for strength and CIMPOR Cimentos de Portugal E.P. with the co-operation of Cembureau ecu Cement organization, held in Oporto, Portugal, 6-7 November 1989.

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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 and additional transportation costs are incurred, in turn lowering the energy savings. It also has to be borne in mind that the market demands on the utility properties of the cements and an increased quality awareness regarding durability of concrete do not allow an unlimited use of secondary constituents and added materials in the manufacture of cement and concrete.

Table 2 gives guidance in assessing the utilization potential of the waste gases. This utilization potential of a waste gas flow increases more than proportionally to its temperature. Hence it will always be endeavoured preferentially to utilize those gases which are hottest. Below 100 °C it is generally no longer economically attractive to utilize the heat. 54 ENERGY EFFICIENCY IN THE CEMENT INDUSTRY Fig. 1–0,5 5–200 0,4–1,8 150–400 0,1–0,5 5–20 5 drying of: raw material filter cake blastfurnace slag coal (inert operation) steam generation drying of: filter cake coal (inert operation) steam generation drying of: blastfurnace slag raw material 3) coal 3) steam generation drying of: filter cake drying of: raw material, coal preheating of: TRADITIONAL AND ADVANCED CONCEPTS OF WASTE HEAT point of gas extraction designation spec, mass temperature °C underpressure flow m3/kg 1)2) mbar 55 dust content g/ scope for m3 1) utilization oil, water ORC-process steam generation 1) at standard temperature and pressure (0 ºC, 1013 mbar) , 2) referred to clinker , 3) possible only after dedusting High dust content in the waste gases is liable to have an adverse effect because the dust gets into the material to be dried or causes deposits or incrustations in waste heat boiler systems requiring special aids and expedients for their removal.

1: Related heat loss through the wall of rotary kilns in dependence on the clinker capacity of the kiln plant for kilns with and without tertiary air duct. individually. On the other hand, with coarse clinker or clinker with a wide grain size distribution the optimization of tube coolers or planetary coolers still presents difficulties. Cooler optimization is at present carried out in practically all plants, normally with the aim of achieving cooler efficiency rates of 70 %. Rotary kiln Especially in smaller capacity kilns heat losses through the wall of the rotary kiln may constitute a substantial proportion of the total energy losses.

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Energy - Efficiency in the Cement Industry by J. SIRCHIS


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