Modeling of effective heat and thermal efficiency of cement clinker production system and its subunit
【摘要】：Various thermal devices along a modern cement production line are often grouped into five subunits according to the functionality of each device and energy/mass flow in between. Study is carried out in the present paper by a heat balance approach to address the energy input, effective heat and heat outflow as occurred in its five subunits. Energy efficiency of each subunit, and its contribution to the energy efficiency of whole system are then discussed. It is found that thermal efficiency of the whole system(φ~(QY)) is in a linear correlation with thermal efficiency of its subunits. Thermal efficiency of Decomposition Clinker Calcination subunit(DC unit) φ~(DC) has greater impact than other subunits on the whole system φ~(QY): an increase of 1% in φ~(DC) leads to an increase for the whole system φ~(QY) by 1.76%. To improve the thermal efficiency of the whole system, measures should be focused on raising thermal efficiency of DC subunit φ~(DC) by for example increasing the decomposition rate of raw feed into rotary kiln, adopting lower calcination temperature in calciner.