1 solenoid valve relay voltage is insufficient
Our company's second-line coal grinding tail bag dust collector model LPM8C-950M, fan model Y315L-4, rated power 185kW, rated current 334A. In the initial stage of operation in 2011, the pressure difference between the inlet and outlet of the bag filter is large, and its working parameters are shown in Table 1.
The coal mill has low output and is often full of grinding. After on-site inspection, it is found that half of the pulse valves do not work, resulting in poor cleaning effect, large dust content in the filter bag, large resistance and poor ventilation. The machine repair checks that the diaphragm of the pulse valve is not damaged. Electromagnetic valve electrical inspection of the normal pulse valve, PLC normal procedure, each relay also work with a movable core within the solenoid driver detecting operation when the solenoid is energized, the solenoid valve and finally found from DC24V input voltage is not enough, only 20V, the magnetic force of the solenoid valve core is not enough, the moving iron core inside the valve is only micro-action, the valve port is not opened, and the high-pressure air cannot backflush the filter bag through the valve port. After replacing the pulse valve hand/automatic transfer switch and relay, the pulse valve works normally, and the bag dust collector has good cleaning effect.
2 lift valve model is too small
Our company No. 3 cement grinding head bag dust collector model FGX-5×2/96, fan model: Y315-4, 110kW, rated current 196A. In 2011, the inlet pressure of the bag filter was 0 kPa, the outlet pressure was increased from -2.4 kPa to -3.6 kPa, and the fan current of the bag filter was reduced by 35 A. The grinding head was seriously ash and was forced to stop. At this time, the cover of the bag filter of the bag filter is completely covered, and the pressure of the gas storage tank is 0.25 MPa. After the pressure of the gas storage tank rises to 0.4 MPa after about 10 to 15 minutes, the poppet valve works normally. There are three reasons for the analysis:
1) The air pressure is unstable: before 2011, the total pressure of the gas storage tank of the cement mill is stable at 0.6 MPa, this problem will not occur, but as the gas consumption of other equipment becomes larger, the total gas tank pressure is often lower than 0.5 MPa, the bag The pressure in the precipitator tank is also low and it is not possible to lift the poppet cover.
2) Equipment failure: It was found that the riser seal of the individual poppet valve was damaged, and the high-pressure air leaked from the damage, resulting in low pressure of the bag filter.
3) The size of the poppet valve is Φ80mm×300mm, and the cross-sectional area of ​​the high-pressure air is small. When the pressure of the gas tank is low, it is not enough to lift the cover. The maintenance valve type was changed to Φ125mm×300mm by inspection, so that even if the high pressure air pressure fluctuated, there was no phenomenon that the inlet pressure of the bag filter was 0 kPa and the grinding head was ash.
3 bags of dust collector leaking air
In 2012, the inlet pressure of the coal-grinding tail bag dust collector became smaller, and the outlet pressure became larger, but the current of the dust-removing fan did not decrease but increased slightly. After checking that the poppet valve and the pulse valve are working properly, standing on the top of the bag filter clearly feels that the top cover is not covered and the air leakage is large. When the pulse valve is working, there is pulverized coal. After the lid is re-covered, the inlet pressure returns to normal.
4 gas storage tank water
In 2010, the packaging workshop had the phenomenon that the bag filter poppet valve and the pulse valve could not work. The air pipe was opened without high-pressure air. Finally, it was found that the water in the total gas storage tank of the packaging workshop was serious, and the accumulated water had exceeded the gas output pipe (equivalent to For sealing purposes, high pressure air cannot be fed to the baghouse. After the water in the gas storage tank is drained, the bag dust collector works normally.
5 Conclusion
In the inspection and operation, the problem should be detected as soon as possible, and the pressure difference between the inlet and outlet of the bag dust collector can directly judge whether the dust collector works normally. When a fault occurs, it is not only mechanically considered, but also from the selection of electrical and equipment.
Process
The sheet is processed in the following steps: decoil the raw material, feed with a fixed length via the servo motor, shearing it with various shearing tools into sheets of various types according to the drawing and then piling them on the stacking table via the conveying mechanism and the arranging mechanism.
Functional features:
1. This device can complete automatic production of various sheets for laminated, Full tapered seam cores.
2. Shearing power: imported electrical servo control technology is adopted, so the device is featured by high speed, low noise and long life.
3. Feeding power: adopt high torque AC synchronous servo motor, so has characteristics such as rapid response, high positioning and accuracy, low noise, low braking thermal loss and long life.
4. Track positioning: the centralized positioning is achieved by dragging the linear tracks of the ball screw with a servo motor. So the positioning is rapid, accurate and convenient and the track width can be memorized automatically.
5. Movement control: advanced PCC control and ethernet powerlink communication technology is adopted, reducing greatly wiring and imporving the reliability, stability and real time of the system remote control and trouble diagnosis can be achieved via the above control and technology, shortening the maintenance time and reducing the cost to the largest extent.
6. Arrangement mode: the backward pushing arrangement mde is adopted and long sheets can be arranged orderly with low vibration, reducing the orientational permeance of the processing process on silicon steel sheets to the largest extent.
7. Life guarantee: standard components of the device are imported quality ones. High accuracy of processing and assembly of basic components extents the service life of the device to the largest extent.
8. This device is a high techmechanical, optical and electrical integrated product with multiple patented technologies, it represents high manufacture level of domestic transverse shear lines and can substitute imported products, saving much outsourcing fund. Some models have automatic cut in cut become column functions.
Cut To Length Machine,Cut To Length Line Machine,Cut To Length Line,Metal Shearing Machine
JINAN EURO-ASIA INT'L CO., LTD , https://www.eaelectricmachine.com