Abstract: Coal powder is flammable explosive material. This content introduces safe grinding workflow, LM coal mill protection setup and key parameters for coal powder preparation plant.
Pulverized clean coal improves combustion efficiency greatly. It is widely adopted for industrial boiler fuel, steel plant blast furnace coal injection and raw material of coal-based activated carbon. The common finished product fineness for these industries is 200 mesh D80-D90. Different from general non-metallic ore grinding, coal pulverizing faces prominent safety risks because fine coal dust is flammable and explosive. Ordinary mineral grinding equipment cannot be directly used for coal processing.
The complete coal powder preparation workflow includes raw coal crushing, iron removal, silo storage, sealed feeding, simultaneous drying-grinding, air classification and inert-gas-protected coal powder collection. High-moisture raw coal needs effective drying during grinding process. CO concentration monitoring, temperature interlock and inert gas fire-suppression device must be equipped for whole circuit.
For large-capacity clean coal powder projects, LM Vertical Roller Mill (coal mill version) is proven mature equipment choice. It integrates drying and grinding function. Hot air enters mill chamber and dries wet raw coal while pulverizing takes place. Multi-level safety protection modules including CO monitoring and inert gas fire suppression are pre-reserved for coal grinding working condition. Intelligent automatic control system supports remote monitoring for long-time stable continuous production.
Roller and grinding plate adopt high-wear-resistant alloy material to resist abrasion from coal and mineral impurities inside raw coal. Negative-pressure fully sealed system prevents coal dust overflow. Finished pulverized coal silo can be configured with inert gas protection to avoid spontaneous combustion hazard during storage. Feed size accepts 0-55 mm and output fineness can be adjusted 20-400 mesh, fully meeting clean coal powder index for boiler and blast furnace injection.
Many project buyers only focus on nominal capacity data but ignore volatile matter content and moisture index of local coal. Wrong safety configuration will leave severe hidden danger for production operation. Coal type, volatile content, moisture and site safety regulation should be collected before equipment selection.
If you intend to construct a pulverized coal preparation plant, please fill in your coal parameters through message board or business consultation button. Provide coal type, volatile value, moisture, target capacity and required powder fineness. SBM engineers will evaluate safety risk and provide complete safe coal grinding production-line configuration.
Summary: This article covers pulverized coal application scenarios and critical explosion-proof requirements. It explains LM vertical coal mill features for coal grinding and project design notes.
FAQ
Q1: What is standard fineness for boiler-use clean pulverized coal?
A: Most boiler and blast furnace injection projects adopt 200 mesh D80-D90 pulverized coal.
Q2: Why cannot ordinary ore mill be directly used for coal grinding?
A: Coal dust is flammable explosive. Special explosion-proof monitoring and fire-suppression protection are mandatory for coal grinding system.
Q3: How does LM vertical coal mill handle wet raw coal?
A: Hot-air stream goes into grinding chamber and completes drying and pulverizing at the same time.
