In the field of coal processing, coal slurry dewatering screen is a kind of vital equipment, which plays an indispensable role in improving the utilisation rate of coal resources, reducing environmental pollution and optimising the coal production process.
The working principle of coal sludge dewatering screen
Coal slurry dewatering screen is mainly based on the principle of vibration screening. It is usually composed of screen box, vibrator, support spring, motor and other components. The motor generates high-frequency vibration by driving the vibrator, so that the coal slurry on the screen surface is subjected to the vibration acceleration perpendicular to the screen surface and the throwing force along the direction of the screen surface. Under the joint action of these two forces, the coal slurry particles are stratified on the screen surface according to the particle size, and gradually move towards the outlet end of the screen surface. At the same time, due to the inclined design of the screen surface, water can be quickly discharged through the screen holes, thus realising the dewatering and classification of coal slurry.
Structural characteristics of coal sludge dewatering screen
1.Screen box
Screen box is the main structure of coal sludge dewatering screen, usually made of high strength steel plate welding, with good rigidity and stability. The shape and size of the screen box are designed according to the processing capacity and screening requirements to ensure that the coal slurry can be evenly distributed on the screen surface and effectively screened.
2.Vibrator
Vibrator is the core component to produce vibration, generally consists of eccentric block, drive shaft and bearings. The mass and rotating radius of the eccentric block determine the excitation force and vibration frequency of the vibrator, thus affecting the screening effect and processing capacity of the coal slurry dewatering screen.
3.Support spring
Support springs are used to support the screen box and reduce the transmission of vibration to the foundation. Common support springs include coil springs, rubber springs and composite springs. They have different elastic properties and damping properties, and the appropriate type of spring can be selected according to the actual working conditions, so as to ensure the stable operation of the coal sludge dewatering screen and good vibration damping effect.
4.Motor
The motor is used as a driving source to provide power for the vibrator. Usually, high-performance explosion-proof motors are used to meet the requirements of flammable and explosive environments such as coal mines. The power and speed of the motor are matched according to the specification and processing capacity of the coal sludge dewatering screen to ensure that the equipment can run normally and achieve the expected screening effect.
Types of coal sludge dewatering screen
1.Linear vibration dewatering screen
The screen surface of linear vibration dewatering screen vibrates along the linear direction, which has the advantages of simple structure, reliable operation and large handling capacity. It is suitable for the dewatering and classification of coarse-grained coal slurry, and its dewatering effect is better, which can effectively reduce the moisture content of coal slurry.
2.Circular vibration dewatering screen
Circular vibration dewatering screen has the advantages of high screening efficiency, not easy to be blocked, etc. The screen surface vibrates along the circumferential direction. It is suitable for the dewatering and classification of coal slurry with medium and fine particle size, and has excellent performance in dealing with sticky coal slurry.
3.High frequency vibration dewatering screen
High-frequency vibration dewatering screen adopts high-frequency vibration mode, which can make the coal slurry particles rapidly stratify and dewater on the screen surface. It has the advantages of good dewatering effect, large processing capacity, small floor space, etc. It is suitable for the occasions with high requirements on dewatering.
Application fields of coal slurry dewatering screen
1.Coal washing plant
In the process of coal washing, a large amount of coal sludge will be produced. Coal slurry dewatering screen can dewater these coal slurry, reduce its moisture content, improve the quality and recovery rate of coal products.
2.Coal mine
The coal slurry water produced in the process of coal mining can be dewatered through the coal slurry dewatering screen after treatment, so as to realise the recycling of coal slurry and reduce the waste of resources and environmental pollution.
3.coal chemical enterprise
Coal chemical enterprises in the production process will also produce coal slurry, coal slurry dewatering screen can be dewatered, for subsequent processing and use to provide convenient conditions.
Coal sludge dewatering screen selection points
1.Processing capacity
According to the actual production demand, determine the processing capacity of coal sludge dewatering screen. The processing capacity should be matched with the production capacity of the upstream equipment to ensure the smooth operation of the whole production process.
2.Screening particle size
According to the particle size distribution and dewatering requirements of coal slurry, select the appropriate screen hole size and screening precision.
3.Dewatering effect
Dewatering effect is an important index to measure the performance of coal slurry dewatering screen, according to the specific process requirements and moisture control standards, choose the equipment that can meet the dewatering effect.
4.Reliability of equipment
Choose the coal sludge dewatering screen produced by manufacturers with good reputation and quality assurance, to ensure that the equipment is stable and reliable in long-term operation, and reduce the downtime and maintenance costs.
5.Running cost
Considering the energy consumption of the equipment, replacement cost of wearing parts, maintenance costs and other factors, choose the coal sludge dewatering screen with lower operating costs.
Maintenance method of coal sludge dewatering screen
1.Daily inspection
Before starting the machine every day, check whether the screen mesh is broken or loose, whether the connection of vibrator is firm, and whether the support spring is deformed or broken.
2.Regular cleaning
Regularly clean the screen surface and the sieve holes to prevent the accumulation of coal sludge from blocking the sieve holes and affecting the dewatering effect. At the same time, clean the dust and sundries on the surface of the equipment to keep it clean.
3.Lubrication maintenance
Regularly add appropriate amount of lubricating oil or grease for the vibrator, bearings and other moving parts to ensure their normal operation and reduce wear and tear.
4.Screen replacement
When the screen mesh is seriously worn or broken, it should be replaced with a new one in time to ensure the screening precision and dewatering effect.
5.Electrical inspection
Regularly check the electrical system to ensure that the lines are well connected, no short circuit, broken circuit and other faults, and the motor is running normally.
6.Parking maintenance
When shutting down for a long time, the equipment should be cleaned up and measures should be taken to prevent rust and moisture.
Maintenance and upkeep of coal sludge dewatering screen
1.Regular inspection
Regularly check the wear and tear of the screen mesh, the lubrication of the vibrator, the deformation of the support spring, etc., so as to discover and deal with potential problems in time.
2.Cleaning maintenance
Keep the screen surface clean to prevent clogging of the screen holes. Regularly clean the accumulated dust and debris on the surface of the equipment to ensure heat dissipation and normal operation.
3.Lubrication maintenance
Regularly lubricate the vibrators, bearings and other parts in accordance with the requirements of the equipment manual to ensure their good lubrication condition and reduce wear and failure.
4.Replacement of wearing parts
Replace the screen mesh, spring and other wear parts in time to ensure the screening effect and operation performance of the equipment.
5.Operator training
Strengthen the training of operators to make them familiar with the operating procedures and maintenance points of the equipment to improve the efficiency and life of the equipment.
Influencing factors of coal sludge dewatering screen
1.Nature of feed material
Including the particle size composition, concentration, viscosity, etc. of coal slurry. The smaller the particle size, the higher the concentration, the higher the viscosity, the greater the difficulty of dewatering.
2.Sieve surface structure
The shape, size and distribution of the sieve holes, as well as the material and inclination angle of the sieve surface will affect the dewatering effect and processing capacity.
3.Vibration parameters
Vibration frequency, amplitude and direction of vibration and other vibration parameters have an important impact on the movement of coal slurry on the screen surface and the effect of dewatering.
4.Feeding method
Uniform and stable feeding can ensure the uniform distribution of coal slurry on the screen surface and improve the dewatering efficiency.
5.Working environment
Temperature, humidity and other environmental factors may affect the physical properties of coal slurry and the operating performance of the equipment.
Operating steps of coal sludge dewatering screen:
Preparation before starting the machine
1.Check the equipment
Carefully check whether the screen mesh is intact, with no breakage, looseness or blockage.
Confirm that the vibrator, motor, support spring and other parts are firmly connected without looseness.
Check the lubrication of each lubrication part to make sure the lubricant or grease is sufficient.
2.Clean up the surrounding environment
Remove the debris on the screen surface and the periphery to ensure that the working area is neat and tidy.
Check whether the inlet and outlet are unobstructed.
3.Commissioning equipment
Adjust the inclination angle of the screen surface to meet the process requirements.
Set the suitable vibration frequency and amplitude according to the characteristics of coal sludge and dewatering requirements.
Start-up operation
1.Starting sequence
Turn on the related auxiliary equipment first, such as conveyor, etc. Then start the coal sludge dewatering screen.
Then start the motor of coal sludge dewatering screen, after the motor runs smoothly, observe whether the working condition of vibrator is normal.
2.Observe the running condition
After switching on the machine, pay close attention to the vibration of the equipment, if there is any abnormal vibration or noise, it should be stopped immediately for inspection.
Check the distribution of materials on the screen surface to ensure uniform feeding.
Operation during running
1.Monitoring parameters
Regularly check the temperature, current and other parameters of the motor to ensure that it operates within the normal range.
Observe the dewatering effect and adjust the vibration frequency, amplitude or feeding speed according to the actual situation.
2.Feeding control
Maintain uniform and stable feeding, avoid big and small or broken material phenomenon.
Control the feeding volume to prevent exceeding the processing capacity of the equipment.
3.Troubleshooting
If the screen mesh is found to be blocked, it should be stopped in time to clean up.
For minor faults, such as loose parts, etc., should be tightened in time during the operation of the equipment, but pay attention to safety.
Shutdown operation
1.Stop feeding
Before stopping the machine, stop feeding the coal sludge dewatering screen.
2.Turn off the motor
After all the materials on the screen surface are discharged, switch off the motor.
3.Cleaning and maintenance
After stopping the machine, clean up the residual coal sludge on the screen surface and inside the equipment in time.
Carry out a comprehensive inspection of the equipment to prepare for the next start-up.
To sum up, as an important equipment in the field of coal processing, coal slurry dewatering screen is of great significance for improving the utilisation efficiency of coal resources and reducing environmental pollution. When choosing and using coal slurry dewatering screen, its working principle, structural characteristics, type, application field, selection points and maintenance and other aspects of knowledge should be fully considered to ensure that the equipment can operate stably and efficiently, and make contributions to the sustainable development of the coal industry.
