What are the common failures of electrostatic precipitators?

The primary voltage is normal, the secondary current is close to zero, the secondary voltage is very high, and the secondary current is zero. The high-voltage isolation knife switch is not in place, or the contact is poor. The damping resistor is blown out.

There is an open circuit (loosening, disconnection) at the measurement point of the high-voltage circuit circuit. The ammeter is loosely wired. The high-voltage isolation gate is placed in the electric field position.

Replace the damping resistor. Check the cable and sampling resistance of the high-voltage measuring point loop. Check the ammeter wiring.

The corona electrode vibration period is too long, resulting in serious dust accumulation on the pole line, resulting in corona closure. The corona pole is not strong enough. Corona electrode rapping device malfunctioning.

The concentration of soot at the inlet of the electric field is too high. The dust is too large in specific resistance, resulting in a back corona (secondary current that is too large or too low). Adjust the rapping cycle.

Handling and improving rapping systems. Dealing with faults or stopping furnaces to deal with hammerheads, etc. Contact the boiler to adjust the combustion and pulverization.

Change the type of coal. - The secondary voltage is low, the primary current is low, the secondary voltage is low, the secondary current is low, and it will not trip after operation. "Partial excitation" failure.

The thyristor trigger circuit is asymmetrical. One of the thyristors is broken, resulting in partial excitation operation. Handle trigger pulse loop defects.

Replace the damaged thyristor.

Rapping offset. Most rapping deviations are caused by thermal expansion of the rapping shaft and wear of the hammer shaft. The discharge electrode vibrates and the transmission porcelain shaft is broken.

The maintenance personnel should replace the broken porcelain shaft in time, remove the dust in the protective cover and protective box of the porcelain transmission shaft, and wipe the dust and scale on the porcelain shaft and the suspended insulator; Card shaft. When the shaft is jammed, the light one will break the fuse, the rapping device will be out of operation, and the heavy one will fail the insurance, twist the transmission shaft, and burn out the rapping motor. For this reason, after the shaft jamming, the maintenance personnel must stop the furnace and enter the electrostatic precipitator for internal maintenance and resume its normal operation.

The reducer is leaking. The oil leakage of the reducer is easy to flow into the inside of the motor and cause the motor to burn out, and effective measures can be taken to avoid this kind of accident. Due to the operator's poor sense of responsibility, he blindly refueled without looking at the oil line, which brought undue losses.

On the other hand, the long-term adhesion of oil scale and dust makes the oil line mark unclear, causing an illusion to maintenance personnel and operation personnel that they cannot see the oil level clearly. Drop the hammer; wear of shafts and bearings; Fuse and pin breakage; Reduced rapping force; Bad rapping motor; The hammer is not flexible. —The secondary voltage is very low, the primary and secondary currents are very large, the secondary voltage is close to zero, and it is tripped during operation.

Pressure-limited and current-limited operation is required. High-voltage isolated knife switch grounding. Breakdown of high-voltage cables or damage to the insulation of terminal joints, breakdown causes a short circuit to ground.

Serious ash accumulation in the electric field ash hopper causes a short circuit between the corona electrode and the dust collector. The corona electrode wire is broken, causing a short circuit. The corona electrode rapping device rotates the porcelain shaft and is damaged or the dust in the porcelain axle box is seriously accumulated, resulting in a short circuit to the ground.

There is a metal foreign body between the electrodes to cause a short circuit. The high-voltage insulator is damaged or the inner wall of the quartz sleeve is condensed and ash condenses, resulting in a short circuit to the ground. The high-voltage isolation knife switch is placed in the electric field position.

Dispose of and replace cables or terminal connectors. Drain the ash hopper to collect dust. Shut down the furnace to deal with the disconnection.

Replace the rotating porcelain shaft or remove the accumulated dust. Stop the furnace to remove foreign matter. Replace the damaged insulator, remove the ash, and put it into the heating device.

or increase the heating temperature.

The electrostatic precipitator reports an undervoltage or short-circuit fault, in this case, strengthen the ash, power failure, self-test, restart, shorten the rapping cycle when necessary, the cathode and anode need to be adjusted, and the power field can be stopped in serious cases, and the continuous rapping mode can be changed, and then put into use after a period of time. The electrostatic precipitator is a necessary supporting equipment for thermal power plants, and its function is to burn the stove or oil pot. The control loop and the main loop cannot be operated, and the safety interlock is not closed in place; Share information, improve the technical level, optimize the quality of the project, and the high-voltage isolation switch chain is not in place; Closing coil and circuit disconnection; 4.

Poor contact of auxiliary switch; Check whether the manhole door and switch cabinet are closed in place; 2.Check the high-voltage isolation switch in place; The ash discharger is stuck, the ash discharger and its motor itself are damaged; The ash contains foreign matter (rapping parts, pole wires, hammers, etc.); There is residual ash in the ash hopper before shutdown; Analyze the cause and troubleshoot the fault. There are too many sparks, air leakage from the manhole, moist air enters, water leakage from the boiler, and dirty insulators.

There are generally only three types of faults in the electrostatic dust collector: 1. Electrical fault: it refers to the failure of the electrostatic precipitator caused by the failure of electrical equipment, and the treatment method is to check the electrical equipment, such as motors, transformers, circuit breakers, cables, wiring, etc., if there is a fault, replace or repair it in accordance with the relevant standards; 2. Pneumatic failure:

It means that the blade fan or blower stops operating normally, which will cause the electrostatic precipitator to work abnormally, and the treatment method is to check the blade fan or blower, such as motors, lubricating oil and sealing gaskets, gearboxes, etc., and should be replaced or repaired in time when faults are found; 3. Packing failure: It refers to the fineness of the sediment is large or the particle size is too large, and the timely treatment is piled up to the fault, if it is found that the capacity of the dust collector decreases, the pressure is high, the noise increases, etc., the treatment method should be cleaned and repaired in time, such as the installation of burr removal equipment. In addition to the above common faults, the electrostatic precipitator may also cause abnormal operation due to wear, excessive dust concentration and particle size of the input gas, excessive temperature, blocked air suction and outlet, etc., which should be dealt with in time.

In addition, regular inspection and maintenance should be carried out, not only to check the condition of the filter fibers, but also to regularly clean the dirt to avoid the impact of accumulation on the effect to ensure normal operation. In addition, it is necessary to regularly check the cleaning of the ridge fiber mesh and the polishing screen, and regularly replace the high-efficiency filter element to ensure the normal operation of the electrostatic precipitator.

Hello, I am glad to answer for you, the common faults and treatment methods of electrostatic precipitator are as follows:1High-voltage power supply collapses and fails:

Check whether the input and output voltage of the high-voltage power supply is normal, and check whether there is high-voltage discharge at the output terminal; Check whether there is poor line contact, electrode corrosion and other phenomena. 2.Collection plate contamination:

Clean the collection plate and keep it clean to avoid contaminants such as dust and oil from adhesion. 3.Offline electrode disconnection:

Open the device to check whether the electrodes are broken or short-circuited, and if so, repair or replace them in time. 4.The transmitter is broken:

Check the difference between the display value of the transmitter and the set value of the console, if the difference is large, the transmitter needs to be replaced. 5.Fixed and Ground Faults:

Check the grounding of the equipment and the fixation of each part to avoid vibration or leakage of the equipment. 6.Overload of oil smoke or dust:

If the amount of oil smoke or dust exceeds the design capacity of the equipment, the number of equipment needs to be increased or replaced with equipment with a larger flow rate. 7.Poor airtightness:

Check the tightness of the equipment and the ventilation duct for air leakage to avoid air leakage and lead to the failure of the electrostatic precipitator. I hope it helps you and I wish you a happy life <>

Troubleshooting methods of electrostatic precipitator high-voltage power supply system: 1) The open-circuit test hits the isolation switch to the position where it is cut off from the electric field, slowly boosts the voltage from the control cabinet, and pays attention to the indication of the primary current. Normally, this indication is small.

2) Check and test 1, the insulation resistance of the core to the ground is 0; 2. Low insulation resistance to the ground: 400m; 3. High insulation resistance to the ground: 1000m; 4. Sampling resistance 78m (U2=60 80kV transformer).

5. Forward and reverse resistance of the silicon stack: Check the forward and reverse polarity of the silicon stack with a 2500V shake meter, if the reverse phase resistance value is "0", it may be the breakdown of the silicon stack or capacitor. If the capacitor resistance is "0", the capacitor is damaged; If the capacitance resistance is normal, the silicon stack is damaged.

6. DC resistance value of high-voltage winding. Compare the measured DC resistance value of the high-voltage winding with the DC resistance value on the label, if the difference is large, the winding is problematic; If the difference is not significant, it must be further judged by testing (i.e., variable ratio test). 3) Ratio test to remove the high-voltage winding and silicon stack board connection line (unilateral), use a voltage regulator to input about 5 10V from the low-voltage side, observe the change of primary current, if there is an obvious indication, it means that there is a short circuit, and measure the induced voltage of each high-voltage winding with a multimeter.

According to the principle of transformer, the same turn should be the same voltage, if the high-voltage winding has the same voltage with the same turn, and i1 has obvious changes, then the low-voltage winding is judged to have a short circuit. For high impedance, after judging that there is a problem with the low-voltage winding, it is also necessary to energize separately and compare the parameters on both sides for further judgment.

How electrostatic precipitators work.

The electrostatic precipitator is a dust removal device that uses a strong electric field to ionize the gas, that is, to produce corona discharge, which then charges the dust and separates the dust from the gas under the action of the electric field force.

The separation of suspended dust particles in gas by the method of electroprecipitator mainly includes the following complex and interrelated physical processes: the application of high voltage, the generation of strong field strength, the ionization of gas, and the generation of corona discharge; Charge of suspended dust particles; Charged dust particles move towards the electrodes under the action of electric field forces; Charged dust particles are collected in an electric field; Vibrating and cleaning the ashes.

First of all, the noise becomes louder.

Generally speaking, the vacuum cleaner makes a little noise when in use. If the sound of the vacuum cleaner is usually not loud and suddenly rises one day, then the vacuum cleaner is broken. There could be two reasons for this.

First, the fixed parts of the vacuum cleaner are loose, and only the reinforced parts are sufficient. The second is that the motor fan falls off, and the fan touches the casing when it is running, so you only need to adjust the motor fan.

Second, the rotation does not raise dust.

If you can hear the motor spinning, you don't want a vacuum. It is likely that the dust bag inside the vacuum cleaner is full, or the hose is clogged. At this point, just clean the garbage from the dust bag and unclog the hose.

Another possibility is that the connection between the vacuum cleaner hose and the brush head is loose and can be simply re-tightened.

Third, the suction becomes smaller.

If the suction power of the vacuum cleaner becomes smaller, it is likely that the internal fuse will blow out. In this case, simply replace the fuse with a new one and restart it. Poor contact of the vacuum cleaner's power cord causes the internal power of the machine to be insufficient, and the suction power will become smaller.

You'll need to change the plug to connect to the power supply. If the motor of the vacuum cleaner is broken, then we have to replace it with a new one.