Vibrating system, the application of PLC in electrostatic dust removal

1 introduction with the augmentation of the national environmental protection consciousness, the country is more and more high to the requirement of dust particle emissions standards, is pressing for higher dust removal efficiency of high voltage electrostatic dust removal technology is used to solve the air pollution. Electrostatic dust removal equipment is the use of high voltage electric field makes the electric field of ion, when the positive and negative ions collide with the smoke free is attached on the soot dust into the charged body of different polarity. Under the action of electric field to the electrode movement, finally adsorbed on the electrode, which makes the smoke purification, in order to collect dust, electrode above equipped with vibrating motor, to regularly vibrating motor, the vibrating motor and vibration dozen mechanical constitutes the electrostatic dust removal system. In this paper, a zinc smelter fire equipment of flue gas dust removal equipment, talk about the application of PLC controller. 2 control requirements of fire, as a kind of zinc smelting zinc technology has been applied to ShuiKouShan for decades. But produce a lot of dust in the flue gas emissions, serious impact on the surrounding environment, causing social tensions between industries. In order to solve the problem of pollution, the use of the high voltage electrostatic dust removal system. The device is a set of three 75 kv electric dust removal equipment, figure 1 as a schematic of the apparatus. After enter the high voltage electric field, induced draft fan forced flue gas purification by shorts flue discharge. Figure of M1, M3 and M5 is grade three Yang vibrating motor, M2 and M4, M6 is three cathode vibrating motor, M7, M8 is to control the two motor valve. Figure 1 75 kv electric dust removal device diagram 2. 1 shaking or jitter sequence control shaking or jitter sequence control action is the basic control of dust removal filter action. Vibrating motor drives the cyclical vibration hammer knock the anode and cathode plate plate line. Make adsorption on its dust removal to be recycled in the hopper, vibration in order to obtain good effect, the requirement of vibrating control system is as follows: ( 1) The same electric field in the anode - Cathode oscillation can not simultaneously. ( 2) Before and after the same time, the electric field in the anode ( Or cathode) Shaking can't work at the same time. ( 3) In order to prevent the M5, M6 shaking, falling dust was 0. Flue gas out of the electric field of 97 m/s. The M5 and M7, M6 and there is a definite relation between the M8, the M5 shaking, M7 and close the valve YM1, after the M5 vibrating delay 1. YM1 5 min to open the valve; Similarly M6 shaking, M8 closed YM2 at the same time, after the M6 vibrating delay 1. Open the valve YM2 5 min. 2. 2 vibrating motor vibration to play and to optimize the design of the vibrating time series analysis ( 1) The first electric field of anode motor M1:5 min, 5 min, circulation; The first electric field of the cathode electric motor M2: stop 5 min, 5 min, cycle. ( 2) The second electric field of anode motor M3: first stop 5 min, 5 min, 15 min cycle stop; The second electric field of the cathode motor M4, first for 5 min, 15 min, 5 min, cycle. ( 3) The third field of anode motor M5: first for 5 min. 25 min, 5 min, circulation; The third field of the cathode electric M6: first stop 5 min, 5 min, 25 min, cycle. Motor vibrating sequence as shown in figure 2, figure 2 motor vibrating sequence diagram 3 chose Japan's mitsubishi PLC controller hardware design FXN - 32 Mr PLC controller. According to the above vibration control requirements, can be concluded that the PLC I/O port distribution is shown in figure 3. Figure 3 4 program design PLC I/O port allocation in order to improve the system reliability, easy debugging and facilitate control function expansion, the control program USES touch block design method, the overall control ladder diagram as shown in figure 4. According to the function is divided into: M1, M2, shaking the first electric field program module, and the second electric field M3, M4 shaking module; The third electric field M5, M6 shaking program module; YM1, YM2 control module. If the sequence diagram in figure 2, each motor vibrating timer is used to control, is due to the time error between the cumulative timer, it is difficult to guarantee the motor always meet vibration optimization logic relationship. To this end, the first electric vibrating sequence in the timer. The second and the third field of vibrating sequence to complete with counter, get the relationship between the electric motor interlock can be realized through software programming, In this paper, we omitted) , at the same time also to be implemented by hardware. To keep the motor vibration optimization between logical relationship. Figure 4 overall control ladder diagram 4. 1 M1, M2, shaking the first electric field application in figure 5, the design of the motor M1 first shaking is immediately after the start button is pressed SB1 starting, stop after 5 min. The second and the back of the loop by Y1 down along the trigger ( The M2 began to stop) 。 And vibration motor M2 trigger is triggered by falling edge of the Y0, this constitutes cycle. Design the program as shown in figure 5. Figure 5 the first electric field M1, M2, shaking 4 program. 2 M3, M4, shaking the second electric field program design according to the vibrating sequence diagram, the second electric motor M3 shaking trigger and vibrating time and motor M2 is the same, just shaking and vibrating between the stop time is long, motor M3 shaking and motor M2 is the same for the first time. So in order to make the timing accuracy, with a vibration control motor M2 M102 as counter counts the pulses. Motor M4 control program and so on, design the control program is shown in figure 6: the second electric field in figure 6 M3, M4 vibrating procedures 4. 3 M5, M6 shaking the third electric field program design according to the vibrating sequence diagram, the third M5 electric motor vibration after shaking and trigger and playing time is the same as the motor M1, shaking and vibrating just stop time is long, in order to improve the control precision, hit by the control of vibration motor M1 auxiliary relay M100 approximately as a count pulse. M6 control procedures etc. Design the control program are shown in figure 7.
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