1. Process principle description

Limestone (CaCO) is calcined at high temperatures (about 900-1100 ℃) in the kiln, decomposing into quicklime (CaO) and releasing carbon dioxide (CO ₂). Natural gas, as a fuel, is sprayed into the kiln through multiple burners evenly distributed around the circumference, providing the heat required for calcination and decomposition.

2. Core equipment composition

2.1 Raw material screening and weighing system: vibrating feeder, main belt conveyor, fixed screener, undersize  belt conveyor, weighing hopper.

2.2 Feeding system: feeding cart, balancing trolley, winch, wire rope, pulley assembly.

2.3 Kiln body: straight cylindrical steel structure (steel shell, platform, stairs), lined with refractory materials.-        

2.4 Burner system: arranged in a circular pattern around the kiln body, with a single row of 12 burners, totaling 36 burners. Including natural gas channel, combustion air channel, circulating air channel, and regulating valves for each channel.

2.5 Natural gas supply system: natural gas pressure regulating station, flow meter, quick cut-off valve, regulating valve, pipeline and safety accessories (explosion-proof valve, relief valve, etc.).

2.6 Air supply system: combustion supporting fan (primary air), cooling fan (secondary air), circulating air, pipeline, flow meter, regulating valve.

2.7 Materials distribution system: top silo, vibrating feeder, materials distributor (key to ensure uniform distribution of fabric around the circumference).

2.8 Lime discharge system: bottom lime discharger (tray discharger), lime discharging sealing device (two-stage sealed discharge valve), hydraulic station.

2.9 Cooling system: kiln bottom cooling air chamber (cooling air enters), air distribution device (air cap).

2.10 Exhaust gas system: emergency exhaust pipe for kiln roof exhaust gas, exhaust gas descending induced draft duct, bag filter, induced draft fan, chimney.

2.11 Instrumentation and control system: temperature (kiln wall, exhaust gas, lime temperature), pressure (kiln interior, gas, combustion air, circulating air), flow rate (gas, combustion air, circulating air), CO/O ₂, level gauge, control system (PLC/DCS).

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