Analysis Of Theoretical Heat Re-Quirement For New Dry Type Cement Clinker Burning

The heat consumption of cement clinker is paid widespread attention to people.But the theoretical heat requirement for clinker burning occupies about a half of thetotal heat consumption of clinker. With the progress of science and technology and thedevelopment of cement technology, the new dry type clinker has a great differencewith traditional clinker in the resepects of kiln type and raw materials. In this thesis,againsting the impact of raw materials on heat requirement for cement clinker burning,starting from this question, through researching and analysising the similarities anddifferences in aspects of raw material, specific heat of raw materials, the formationprocess of the new dry process clinker and traditional clinker using the modernmethods like XRD,TG-DTA,DSC et, combined with the results of the experimentaldetermination, we investigate the simple calculation method of new dry cementclinker and the factors of the heat requirement for cement clinker burning.Proposed a new method—acid dissolution method for admeasuring heat require-ment of cement clinker formation of cement clinker. The results show that the theo-retical heat requirement for cement clinker burning is increasing with KH’s adding. Sowe can decrease heat consumption through reducing KH. Kinds of raw materials havelarge effect on it. It can decrease theoretical heat requirement after adding waste resi-due from industry particularly carbide slag. Through the study of the differences abouttheoretical heat requirement for clinker buring between the new dry cement clinkerand traditional clinker suggests that, for the raw material with limestone and clay (in-cluding sandstone, shale) ingredienting, the error of the value for their heat require-ment is little between pure thermodynamics and empirical formula. Their errors areless than2%in the measurement of the allowable error range and the empirical for-mula is still applicable. For the raw materials adding industrial waste like steel slag,flyash ect, the error of the value for their heat requirement is much larger between purethermodynamics and empirical formula, because there are much clinker materialsformatted and decomposition of CaO component in them. Their errors are of5.16%and2.49%. So the traditional empirical formula needs to be amended before it can beused to calculate such clinker’s formation heat. For the raw materials adding carbideslag, the error of the value for their heat requirement is the most largest between purethermodynamics and empirical formula, because thermal decomposition characteris- tics of carbide slag are different from limestone. Their errors are of45.6%. So the tra-ditional empirical formula hasn’t been used to them. We must explore new formula tocalculate such clinker’s formation heat.Based on chemical thermodynamics theory, the simple formula of theoretical heatrequirement for clinker burning derived with adultering fly ash, slag or calcium car-bide slag. Using the derived formula calculate the theoretical heat requirement forclinker burning can control the error in less than2%. It can provide a great conveni-ence for the thermal calculation of the furnace and the thermal efficiency.