Modelling of Lime Kiln Using Subspace Method with New Order Selection Criterion

Table 1

Process parameters of rotary kiln.

Parameter	The parameter of kiln
Raw material granularity	10~40 mm
Preheater temperature	900~1100°C
Kiln head temperature	800~950°C
Kiln tail temperature	1100 ± 20°C
Calcining zone temperature	1260~1340°C
Second air temperature	750~900°C
Kiln head cover temperature	800~950°C
Exhaust gas temperature	250°C
Lime temperature after cooling	≤150°C
Kiln head pressure range	−10~−20 pa
Gas pressure	≥6 KPa
Calcinations process pressure	Negative pressure 100–150 Pa
Pulse jet cleaning pressure	0.35~0.5 MPa
3920 dust removel pressure difference	≤1.5 kPa
Kiln body inclination	3~5%
Kiln speed range	0.2~1.28 r/min
CaO content	>88%
Activity degree	>350 mL
Exhaust gas residual carbon	<=1%
Exhaust gas oxygen content	0.7%~2.5%
Dust collector air volume	225000 m^3/h
Material level in preheater	5~8.8 m
Material level in cooler	≤0.55 m
production	600 T~650 T
SiO2	<1.5% or <2%
MgO	5%
Power consumption	65 kw·h/t~60 kw·h/t
Heat consumption	1630~1650 kJ/kg