Complete set of coal powder preparation equipment

A complete set of coal powder preparation equipment is essential for the coal injection process in blast furnaces. This equipment is designed to handle the entire process from coal handling to the production of a fine coal powder that can be injected into the furnace. Here's an overview of the components that typically make up a coal powder preparation system:

1. Coal Handling System:

- Coal Storage: Facilities to store coal in a dry environment to prevent moisture absorption.

- Coal Feeders: Devices that regulate the flow of coal from the storage to the processing unit.

- Crushers: Equipment to reduce large coal lumps to a smaller size, often to a maximum size of 50 mm.

2. Coal Washing and Cleaning Plant:

- Washing Equipment: Washers and scrubbers to remove dirt, dust, and moisture from the coal.

- Screening Plants: Separators to sort the coal into different sizes, often required for the subsequent milling process.

3. Coal Grinding and Milling System:

- Mills: Typically ball mills or vertical roller mills, used to grind the coal to a fine powder. The coal is dried and ground to a particle size typically between 70% passing through a 200-mesh screen (0.074 mm).

- Classifiers: Equipment to separate the ground coal into different particle sizes, ensuring the desired fineness for the injection process.

4. Coal Dust Collection and Handling System:

- Dust Collectors: Devices such as bag filters or electrostatic precipitators to capture and remove coal dust from the air to prevent environmental pollution and ensure operator safety.

- Fans and Ductwork: Systems to transport the air and coal powder, controlling the flow and pressure throughout the preparation plant.

5. Control Systems and Automation:

- PLC and SCADA: Programmable logic controllers and supervisory control and data acquisition systems to automate the coal powder preparation process, ensuring consistency and safety.

- Instrumentation: Sensors and meters to monitor critical parameters such as coal flow, powder fineness, and air pressure.

6. Safety and Environmental Protection Equipment:

- Explosion Proof Equipment: Electrical devices and systems designed to prevent the occurrence of explosions in areas with flammable gases or dust.

- Ventilation Systems: Mechanical ventilation to maintain a safe working environment with proper air quality.

7. Coal Powder Storage and Distribution:

- Silos: Storage facilities for the prepared coal powder, with conveyors or other mechanisms to distribute the powder to the blast furnace.

- Feeders and Conveyors: Devices to transport the coal powder from the silos to the injection points in the blast furnace.

The specific configuration of the coal powder preparation equipment will depend on the characteristics of the coal, the capacity requirements of the blast furnace, and the technical specifications of the steelmaking process. The design of the system must balance the need for efficient and consistent powder production with environmental regulations and workplace safety.