The horizontal screw centrifuge (hereinafter referred to as the centrifuge) is used for a variety of operations, including pre-start preparation, power-on, shutdown, and adjustment of operating conditions.
1. Pre-Startup Preparation:
(1) First, check the power supply wiring and grounding of both the main and auxiliary motors to ensure they are safe and reliable. Inspect the belt for looseness, slippage, and confirm that the rotation direction matches the one indicated on the hood.
(2) Ensure that the oil filling hole on the drum is properly lubricated according to the manufacturer’s specifications.
(3) Manually rotate the drum to check for any friction or collision, and make sure it turns smoothly.
(4) Install the deep overflow plate in the correct position and adjust it based on the dryness of the solid discharge.
(5) Secure the upper hood cover and check that all bolts on both sides are tightened. Also, verify that the pulley cover bolts are secure and that the pulleys do not touch the hood.
(6) Configure the main motor inverter settings.
(7) Set up the auxiliary motor inverter.
(8) Adjust the PLC touch screen parameters.
Once these settings are complete, the system will display the feed flow rate, dosing flow rate, differential speed, and motor frequencies during operation. The displayed flow rate on the touch screen is an estimated value. For accurate records, use the actual flow rate from the flow meter. During operation, monitor the dryness of the solid phase and the clarity of the liquid discharge, and adjust the feed and dosing rates accordingly.
(9) Before starting, ensure that the feed pump, clean water pump, and dosing pump are in good working condition.
(10) Check that the feed line and dosing dilution line on the chemical dilution device are clear and unobstructed.
2. Startup Procedure:
(1) Use the touch screen to start the main and auxiliary motors simultaneously. When the main motor reaches 15–20 Hz, begin feeding clean water through the inlet until clean water flows out of the drain.
(2) Once the operating frequency stabilizes, activate the dosing pump and check if the transparent feed tube is delivering liquid into the centrifuge.
(3) Turn on the feed pump and verify that material is entering the centrifuge through the transparent feed tube.
(4) After running for 15–20 minutes, inspect the solid discharge at the outlet and the clarity of the liquid from the drain. If the solids are too wet, shut off the feed pump first, then the dosing pump, followed by the main and auxiliary motors, and replace the overflow plate.
(5) Replace the overflow plate with a larger inner diameter to reduce the liquid pool depth and improve solid dryness. If this doesn’t help, increase the auxiliary motor frequency, which reduces the differential speed and improves solid drying, though it may lower liquid clarity.
(6) Once the performance meets the required standards, the centrifuge is considered to be in normal operation.
3. Shutdown Procedure:
(1) Turn off the dosing pump.
(2) Close the feed valve.
(3) Shut down the feed pump.
(4) Open the inlet and cleaning valves to rinse the internal components of the centrifuge. Continue rinsing until clean water exits the drain. If the centrifuge will be idle for 3–5 days, a water rinse is not necessary.
(5) Finally, turn off the main and auxiliary motors.
4. Operation Monitoring:
(1) Keep the main motor current within approximately 85% of its rated capacity to avoid overloading the centrifuge.
(2) Every two hours, check and record the feed flow rate, concentration, vibration levels, bearing temperature, main and auxiliary motor currents, and torque. If the centrifuge uses thin oil lubrication, also monitor the lubricant pressure, flow, inlet, and return temperatures. Any deviations should be addressed promptly.
(3) If any abnormal conditions occur, take immediate action and document the issue.
(4) Monitor the bearing housing temperature closely. If it exceeds 50°C above ambient temperature, take it seriously. The grease inside the bearings can withstand up to 80–120°C. If the temperature remains high after adding lubricating oil for 20 minutes, stop the machine and investigate further.
5. Operating Condition Adjustment:
(1) Adjustment Principles:
The centrifuge has three key adjustable parameters: drum speed, differential speed between the screw and drum, and the depth of the liquid pool.
Normally, set the drum speed based on the material being processed, then adjust the differential speed and overflow plate according to the separation performance. Generally, a smaller differential speed reduces solid moisture but lowers liquid clarity, while a larger differential speed increases clarity but raises moisture content. A smaller overflow plate diameter increases liquid clarity but makes solids wetter, while a larger diameter improves solid dryness but reduces clarity.
Therefore, when clarity is more important, use a deeper liquid pool and avoid a very low differential speed. When dryness is the priority, use a shallower pool and a lower differential speed.
(2) Adjustment Procedure:
1) Once the centrifuge is running normally, check the liquid clarity and solid dryness.
2) If the results are unsatisfactory, first adjust the drum speed and differential speed to change the effective centrifugal force and the retention time of solids in the dewatering zone.
3) If the adjustments don't meet the requirements, stop feeding, follow the shutdown procedure, replace the overflow plate, and adjust the liquid pool depth. To replace the overflow plate, open the hood, remove the existing plate, install a new one, restart the centrifuge, and resume feeding. Repeat this process until the desired performance is achieved.
Keywords: decanter centrifuge
Source: http://
Http://news.chinawj.com.cn Submission:
1. Pre-Startup Preparation:
(1) First, check the power supply wiring and grounding of both the main and auxiliary motors to ensure they are safe and reliable. Inspect the belt for looseness, slippage, and confirm that the rotation direction matches the one indicated on the hood.
(2) Ensure that the oil filling hole on the drum is properly lubricated according to the manufacturer’s specifications.
(3) Manually rotate the drum to check for any friction or collision, and make sure it turns smoothly.
(4) Install the deep overflow plate in the correct position and adjust it based on the dryness of the solid discharge.
(5) Secure the upper hood cover and check that all bolts on both sides are tightened. Also, verify that the pulley cover bolts are secure and that the pulleys do not touch the hood.
(6) Configure the main motor inverter settings.
(7) Set up the auxiliary motor inverter.
(8) Adjust the PLC touch screen parameters.
Once these settings are complete, the system will display the feed flow rate, dosing flow rate, differential speed, and motor frequencies during operation. The displayed flow rate on the touch screen is an estimated value. For accurate records, use the actual flow rate from the flow meter. During operation, monitor the dryness of the solid phase and the clarity of the liquid discharge, and adjust the feed and dosing rates accordingly.
(9) Before starting, ensure that the feed pump, clean water pump, and dosing pump are in good working condition.
(10) Check that the feed line and dosing dilution line on the chemical dilution device are clear and unobstructed.
2. Startup Procedure:
(1) Use the touch screen to start the main and auxiliary motors simultaneously. When the main motor reaches 15–20 Hz, begin feeding clean water through the inlet until clean water flows out of the drain.
(2) Once the operating frequency stabilizes, activate the dosing pump and check if the transparent feed tube is delivering liquid into the centrifuge.
(3) Turn on the feed pump and verify that material is entering the centrifuge through the transparent feed tube.
(4) After running for 15–20 minutes, inspect the solid discharge at the outlet and the clarity of the liquid from the drain. If the solids are too wet, shut off the feed pump first, then the dosing pump, followed by the main and auxiliary motors, and replace the overflow plate.
(5) Replace the overflow plate with a larger inner diameter to reduce the liquid pool depth and improve solid dryness. If this doesn’t help, increase the auxiliary motor frequency, which reduces the differential speed and improves solid drying, though it may lower liquid clarity.
(6) Once the performance meets the required standards, the centrifuge is considered to be in normal operation.
3. Shutdown Procedure:
(1) Turn off the dosing pump.
(2) Close the feed valve.
(3) Shut down the feed pump.
(4) Open the inlet and cleaning valves to rinse the internal components of the centrifuge. Continue rinsing until clean water exits the drain. If the centrifuge will be idle for 3–5 days, a water rinse is not necessary.
(5) Finally, turn off the main and auxiliary motors.
4. Operation Monitoring:
(1) Keep the main motor current within approximately 85% of its rated capacity to avoid overloading the centrifuge.
(2) Every two hours, check and record the feed flow rate, concentration, vibration levels, bearing temperature, main and auxiliary motor currents, and torque. If the centrifuge uses thin oil lubrication, also monitor the lubricant pressure, flow, inlet, and return temperatures. Any deviations should be addressed promptly.
(3) If any abnormal conditions occur, take immediate action and document the issue.
(4) Monitor the bearing housing temperature closely. If it exceeds 50°C above ambient temperature, take it seriously. The grease inside the bearings can withstand up to 80–120°C. If the temperature remains high after adding lubricating oil for 20 minutes, stop the machine and investigate further.
5. Operating Condition Adjustment:
(1) Adjustment Principles:
The centrifuge has three key adjustable parameters: drum speed, differential speed between the screw and drum, and the depth of the liquid pool.
Normally, set the drum speed based on the material being processed, then adjust the differential speed and overflow plate according to the separation performance. Generally, a smaller differential speed reduces solid moisture but lowers liquid clarity, while a larger differential speed increases clarity but raises moisture content. A smaller overflow plate diameter increases liquid clarity but makes solids wetter, while a larger diameter improves solid dryness but reduces clarity.
Therefore, when clarity is more important, use a deeper liquid pool and avoid a very low differential speed. When dryness is the priority, use a shallower pool and a lower differential speed.
(2) Adjustment Procedure:
1) Once the centrifuge is running normally, check the liquid clarity and solid dryness.
2) If the results are unsatisfactory, first adjust the drum speed and differential speed to change the effective centrifugal force and the retention time of solids in the dewatering zone.
3) If the adjustments don't meet the requirements, stop feeding, follow the shutdown procedure, replace the overflow plate, and adjust the liquid pool depth. To replace the overflow plate, open the hood, remove the existing plate, install a new one, restart the centrifuge, and resume feeding. Repeat this process until the desired performance is achieved.
Keywords: decanter centrifuge
Source: http://
Http://news.chinawj.com.cn Submission:
Tailings Wear Resistant Pipe,Gas Delivery Pipes,Gas Delivery Pe Pipes,Low Temperature Resistance Drainage Pipe
SHANDONG EASTERN PIPE CO., LTD. , https://www.dfuhmwpe.com