1, Calcined limestone

   A lime kiln is a kiln used to produce quicklime by the calcination of limestone (calcium carbonate). The chemical equation for this reaction is:
CaCO3 + heat → CaO + CO2

  Qualified limestone stores in silos and be shipped through the pre-heater by the elevator into the silos which is on the top of the pre-heater. The pre-heater on the top of silos is consisted of top and bottom level meter controllers which control the feeding capacity. Then through the feed tube the limestone is distributed to the indoor compartment of the pre-heater.     The limestone in the pre-heater is heated to around 900 ° C by the kiln flue gas of 1150 ° C. At this time, about 30% of the limestone has been decomposition. Then the limestone is put into the rotary kiln by the hydraulic stem. In the rotary kiln the limestone sinters and decomposes into CaO and CO2. Then the decomposed limestone goes into the cooler and is cooled to about 100 ° C by the cold air and then is discharged. The 600 ° C hot air after heat exchange goes into the kiln and combusts with gas. The Exhaust gas blended with the cold wind go to the bag filter through the suction fan and then through the exhaust fan into the chimney.     The limestone out of the cooler enters into the lime storehouse through the vibrating feeder, chain bucket conveyor, bucket elevator and belt conveyor. Whether to carry out screening and other procedures depends on customer requirements.
 

2, Main technical parameters

Design Capacity(t/d)	Product	Pre-heater	Rotary Kiln			Cooler	Fuel	Heat Consumption (kJ/kg Cao)
			Size(m)	Effective Volume (m3)	Burning Temperature
150	Active Lime Soft-burnd Dolomite	Circular Vertical  Pre-heater	Φ 2.5×40	142	1350/ 1250	Circular Vertical Cooler	Gas Coal Dust	5300/5000
200	Active Lime Soft-burned Dolomite	Circular Vertical  Pre-heater	Φ 2.8×42	190	1350/ 1250	Circular Vertical Cooler	Gas Coal Dust	5300/5000
250	Active Lime Soft-burned Dolomite	Circular Vertical  Pre-heater	Φ 3×46	235	1350/ 1250	Circular Vertical Cooler	Gas Coal Dust	5300/5000
300	Active Lime Soft-burned Dolomite	Circular Vertical  Pre-heater	Φ 3.2×50	292	1350/ 1250	Circular Vertical Cooler	Gas Coal Dust	5300/5000
350	Active Lime	Circular Vertical  Pre-heater	Φ 3.5×54	390	1350	Circular Vertical Cooler	Gas Coal Dust	5225
400	Active Lime	Circular Vertical  Pre-heater	Φ 3.6×5	430	1350	Square Vertical Cooler	Gas Coal Dust	5225
500	Active Lime	Circular Vertical  Pre-heater	Φ 3.8×58	505	1350	Square Vertical Cooler	Gas Coal Dust	5100
600	Active Lime	Circular Vertical  Pre-heater	Φ4×60/ Φ4.2×50	575/ 548	1350	Square Vertical Cooler	Gas Coal Dust	5100
750	Active Lime	Shape Vertical  Pre-heater	Φ 4.3×58	670	1350	Square Vertical Cooler	Gas Coal Dust	4810
800	Active Lime	Shape Vertical  Pre-heater	Φ 4.3×64	738	1350	Square Vertical Cooler	Gas Coal Dust	4810
1000	Active Lime	Shape Vertical  Pre-heater	Φ 4.8×68	1005	1350	Square Vertical Cooler	Gas Coal Dust	4810