The main equipment of a vertical lime kiln production line can be divided into several systems based on the process flow. Below is a detailed breakdown of the equipment components and their functions:

1. Raw Material Preprocessing System

Crusher  

Types: Jaw crusher, impact crusher, hammer crusher, etc.  

Function: Crushes large limestone blocks into particles of ≤30-50mm to meet the requirements for kiln calcination.  

Vibrating Screen  

Function: Screens the crushed limestone to separate unqualified particles (oversized particles are returned for re-crushing, while undersized particles may be used for other purposes).  

Belt Conveyor  

Function: Transports the crushed limestone to the raw material silo or preheating system.  

2. Calcination System (Core Section)  

Vertical Kiln Body  

Types: Mixed-feed vertical kiln (equipped with a distributor), gas-fueled vertical kiln (e.g., natural gas, coal gas).  

Structure: Includes the kiln body (steel shell with refractory brick lining), discharge device, ventilation system, etc.  

Function: Limestone is calcined at high temperatures (900-1200°C) inside the kiln to decompose into quicklime (CaO).  

Combustion System  

Equipment: Gas burners, pulverized coal injection devices (for coal-fired kilns), combustion-supporting fans, etc.  

Function: Provides the heat required for calcination. Modern vertical kilns predominantly use clean energy (e.g., natural gas) to reduce pollution.  

Distributor  

Function: Ensures uniform distribution of limestone and fuel (in mixed combustion) to guarantee even ventilation and calcination within the kiln.  

3. Discharge and Cooling System  

Discharge Device  

Types: Rotary discharge disc, hydraulic pusher, etc.  

Function: Controls the discharge rate of quicklime to prevent temperature fluctuations inside the kiln.  

Cooler  

Types: Single-drum cooler, vertical cooler, etc.  

Function: Cools the high-temperature quicklime to below 100°C for storage and transportation, while recovering waste heat.  

4. Exhaust Gas Treatment System  

Dust Collector  

Types: Bag filter, electrostatic precipitator, wet scrubber, etc.  

Function: Removes dust from flue gas to meet environmental emission standards (e.g., PM ≤30mg/m³).  

Desulfurization Unit (Optional)  

Types: Dry/semi-dry desulfurization tower.  

Function: Reduces SO₂ content in flue gas, suitable for high-sulfur fuels or regions with strict emission regulations.  

Induced Draft Fan  

Function: Directs exhaust gas through the treatment system before emission.  

Environmental Requirements: Modern vertical kilns must be equipped with comprehensive denitrification (SCR/SNCR), desulfurization, and dust removal equipment.  

5. Finished Product Handling System  

Vibrating Feeder  

Function: Uniformly transports cooled quicklime to the next processing stage.  

Bucket Elevator/Screw Conveyor  

Function: Lifts the finished product to storage silos or packaging sections.  

Grinding Equipment (Optional)  

Types: Raymond mill, ball mill.  

Function: Grinds lump quicklime into powder for use in chemical, construction, and other industries.  

Packaging Machine  

Types: Bulk bag packer, valve bag packer.  

Function: Automates packaging of the finished product for easy transportation and sale.  

6. Automation Control System  

PLC/DCS Control Center  

Function: Monitors parameters such as temperature, pressure, and flow rate, and adjusts fuel and air supply to achieve energy-efficient production.  

Sensors and Instruments  

Includes: Thermocouples (temperature measurement), pressure transmitters, CO/O₂ analyzers (for combustion optimization).  

Auxiliary Equipment  

- Limestone storage silo: Buffers raw material supply.  

- Fuel storage system: Such as LNG storage tanks, pulverized coal silos, etc.  

- Water circulation system: Used for equipment cooling and exhaust gas treatment.