Special coal mill powder separator

Introduction to the powder classifier for coal mill:

Structural composition:

• Drive part:

usually composed of motor, reducer and coupling, etc., to provide power for the rotor of the powder classifier and drive it to rotate. The motor generally adopts a variable frequency motor, which can flexibly adjust the speed according to production needs.

• Swing part:

The core components include the rotor, which is equipped with blades of special shape. In addition, there is a spreading device, which is used to evenly spread the materials entering the powder classifier to the surroundings for better sorting.

• Shell part:

It is welded from steel plates to form the outer shell of the powder classifier, which plays a role in supporting and protecting the internal components. Guide blades are provided in the shell to guide the airflow to form a stable powder selection airflow field.

• Inlet and outlet parts:

including air inlet and air outlet, the air inlet is used to introduce dusty airflow, and the air outlet is used to discharge the airflow corresponding to the fine powder and coarse powder after sorting.

• Dust collecting device:

connected to the outlet of the powder classifier, used to collect the finished fine powder after powder selection. Common dust collecting devices include cyclone dust collector, bag dust collector, etc.

• Working principle:

The air containing coal powder from the wind-swept mill enters the powder concentrator through the lower air duct, and after being rectified by the inner cone, it decelerates and rises along the annular channel between the outer cone and the inner cone. Among them, the coarse powder slides into the coarse powder collection device along the side wall of the outer cone by gravity sedimentation to achieve gravity sorting. The air after gravity sorting carries the material particles and forms a stable horizontal vortex powder selection area between the guide vane and the rotor under the guidance of the guide vane and the rotation of the rotor. The dust particles moving in the vortex are affected by gravity, wind force and rotating centrifugal force at the same time. The fine and light particles are sucked into the rotor with the air flow, flow through the air outlet pipe and enter the dust collector behind, and are separated as finished fine powder; the coarse and heavy particles fall, gather in the coarse powder collection device through the inner cone, and return to the mill for re-grinding.

Advantages and characteristics of the special powder classifier for coal mill:

High-efficiency powder selection:

• Advanced sorting structure:

It adopts advanced structures such as vertical guide blades and straight cage rotors. It is a more efficient sorting structure today, and the powder selection efficiency can reach more than 90%.

• Good airflow control:

Through the optimized structural design, the airflow distribution in the powder classifier is more uniform and stable, providing a good airflow environment for the efficient sorting of materials, and can accurately select coal powder particles that meet the fineness requirements to improve the quality of coal powder.

Energy saving and consumption reduction:

• Low resistance design:

The entire flow field is optimized and designed using the aerodynamic analysis method, and the equipment resistance is significantly reduced, which reduces the energy consumption of the fan and greatly reduces the power consumption of the drive motor.

• Eddy current breaking technology:

The rotor is equipped with an eddy current breaker. The airflow in the rotor only rises but does not rotate relative to the rotor. The driving force on the rotor is reduced due to the momentum of the airflow after rotation, which can save driving power and reduce wear. Many user feedback shows that the use of this special powder classifier for coal mill can save energy by more than 30%-40%.

Convenient operation and maintenance:

• Flexible fineness adjustment:

The main motor can be remotely controlled. By changing the speed of the main motor of the powder selector through the frequency converter, the fineness of the product can be adjusted within a large range. The operation is simple and convenient, and can meet the requirements of coal powder fineness of different production processes.

• Low maintenance cost:

The easily worn parts such as the inner cone, shaft hub sleeve, wind guide blades and rotor blades are all treated with wear-resistant materials or anti-wear processes, with a very low wear rate, a long service life of the equipment and low maintenance costs.

• System simplification:

Some coal mill special powder selectors have the functions of both coarse powder separators and powder selectors, realizing the same path for materials and gas, thereby achieving the purpose of simplifying the system and reducing the equipment's footprint and investment cost.

• Strong reliability:

After optimized structural design and strict manufacturing process, the equipment operates stably and reliably, can adapt to the long-term and high-load working requirements of the coal mill system, reduces downtime caused by equipment failure, and improves production efficiency.