What are the main items of electrostatic precipitator major and minor repairs?

A dust collection hood is set up in each ash place, and the dust-containing gas is transported to the dust removal device through the pipeline gas path, in which the dust is collected in the dust removal device after the gas-solid separation is carried out, and the clean gas is introduced into the main pipe or directly discharged into the whole set of equipment into the atmosphere, that is, the dust removal system, and the dust collector is an important part of the system. From the perspective of ventilation and dust removal, dust is all solid small particles that can float in the air for a long time, and is a dispersion system, called aerosol, in which air is the dispersed medium and solid particles are the dispersed phase. A dust collector is a device that separates these small solid particles from aerosols.

Disposal of broken discharge electrodes; Check and adjust the deformed dust collection plate; Check the dust accumulation of the dust collector and discharge electrode, and analyze the cause and take measures when it is abnormal; Check the fastening of each shaft and hammer of the rapping system, and replace the broken and damaged safety pins in time; Check the reducer, if there is leakage, it should be eliminated in time, check the electromagnetic vibration hammer system and deal with the defects in time; Check the temperature control system and replace the damaged thermometer; Check the air leakage at the smoke box, shell, ash hopper and manhole door, and weld or replace the sealing gasket if necessary; Inspect the leakage of each pipeline valve; Remove the dust accumulation on the insulating porcelain pillars, sleeves, rapping porcelain shafts (insulated shafts), cable terminal boxes, etc. of the suspended discharge electrode, wipe them clean, and replace the damaged insulators; Check the pipeline system of the cleaning equipment of the smoke and dust continuous monitor, and there should be no leakage; Check the light source of the smoke and dust continuous monitor, and replace it in time if it is damaged.

Observe the dust accumulation of the anode plate and cathode line, analyze the cause of the ash accumulation, and make technical records. Observe the airflow distribution plate and make technical records. Plate bending and offset, cathode frame deformation, pole wire falling off or loosening, etc., and macroscopic inspection.

The maintenance and dust removal efficiency of the electrostatic precipitator is improved, and the treatment method of controlling the emission exceeding the standard: special research and solution to improve the flue gas process of the dust collector; Check the cause of air leakage of the electrostatic precipitator and repair it; Clean up the dirt and adjust the rapping cycle; Replace the components and readjust the automatic control system; Deal with the causes of electrostatic precipitator failures one by one; Overhaul or replace the anode plate to keep it in normal operation. Check the dust accumulation of the dust collector and discharge electrode, and remove the dust accumulation; Check the positioning device of the dust collection plate row, and replace the damaged plate and pole wire; Comprehensively check and adjust the pole distance; Overhaul the rapping system and transmission device of the discharge electrode and dust collector, and overhaul the electromagnetic rapping system; Remove ash accumulation in the ash hopper and suspended discharge grade insulator chamber; overhaul of high- and low-voltage power supply equipment and control systems; overhaul unloading (conveying) ash system; Other items that need to be overhauled or replaced.

The no-load power-on boost test of electrostatic precipitator is the only reliable means to test the installation quality and maintenance quality of electrostatic precipitator. Since the guarantee of the electric field heteropole spacing is essential for the long-term efficient operation of the equipment in the future, this acceptance process is indispensable. The no-load test must be carried out under normal local weather conditions, and can no longer be carried out on rainy, snowy, foggy and windy days.

Before the power-on boost test, it should be confirmed that the electric field has been cleaned up, and the grounding resistance of the main equipment should be less than 4. The secondary current and voltage counting values are directly read out from the table on the high-voltage power supply control cabinet, and the symbiotic three times, each time the voltage boost time is not less than 10 minutes, and the average value of the highest voltage measured by the three times is used as the highest voltage test value.

The judgment standard of the no-load test voltage of the newly installed electrostatic precipitator, and the old equipment after several years of use, due to the performance has decreased, the benchmark value can be relaxed by about 10% according to the actual situation. A electrostatic precipitator with three electric fields and normal operation is calculated according to the design efficiency of 99%, and if only one electric field is invested, the dust removal efficiency is about 88%; If two electric fields are invested, the dust removal efficiency is about 97%; When the three electric fields are fully invested, the dust removal efficiency reaches 99% of the design efficiency. The average dust removal efficiency of electric fields at all levels is about 87%.

It should be noted that this is a theoretical state, which should be determined according to the specific performance of the electrostatic precipitator, and the longer the equipment is used, the worse the state. If it is a two-chamber three-electric field electrostatic precipitator, A and B two will each stop an electric field and one side stop two electric fields are two different concepts, although the number of power fields is the same, but the dust removal efficiency is very different, the former is about 96%, the latter is only 88%.

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Electrostatic precipitators can only achieve high efficiency when they are well powered. With the increase of the power supply voltage, the corona current and corona power increase sharply, and the effective driving speed and dust removal efficiency also increase rapidly. Therefore, in order to fully play the role of the electrostatic precipitator, the power supply unit should be able to provide sufficient high voltage and have sufficient power.

The power supply device of the electrostatic precipitator mainly includes: step-up transformer, rectifier and control device, in addition, there is a high-voltage cable that outputs the rectified high-voltage direct current, and the direct current is input into the electrostatic precipitator through the high-voltage cable. The basic requirements for the power supply device are:

It provides high electric field strength and corona current required for dust charge and dust collection, reliable operation, long service life, and less inspection and maintenance.

In order to improve the efficiency of an electrostatic precipitator, the supply voltage must be as high as possible. However, when the voltage rises to a certain value, a spark discharge will be generated, and the voltage drops between the poles in an instant, and the disturbance of the spark causes secondary dust on the plates. A large number of practical experiences have shown that each electrostatic precipitator or each electric field has an optimal spark rate (the number of sparks produced per minute is called the spark rate), which is generally about 50 100 min, when the gain from the increase in voltage is exactly offset by the loss caused by the spark.

If the voltage rises again, the gain will not be enough to offset the loss. Generally speaking, the electrostatic precipitator has the highest average voltage and the highest dust collection efficiency when operating at the optimal spark rate. Therefore, with the help of an instrument that measures the average voltage, the electrostatic precipitator can be easily adjusted to the optimal operating conditions.

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The details are as follows:

1) Main items of electrostatic precipitator minor repair:

1) Dispose of the disconnected electrode;

2) Check and adjust the deformed dust collection plate;

3) Check the dust accumulation of the dust collector and discharge electrode, and analyze the cause and take measures when it is abnormal;

4) Check the fastening of each shaft and hammer of the rapping system, and replace the broken and damaged fuse pins in time;

5) Check the reducer, if there is leakage, it should be eliminated in time, check the electromagnetic vibration hammer system and deal with the defects in time;

6) Check the temperature control system and replace the damaged thermometer;

7) Check the air leakage at the smoke box, shell, ash hopper and manhole door, and weld or replace the sealing gasket if necessary;

8) Repair the leakage of each pipeline valve;

9) Remove the dust accumulation on the insulating porcelain pillars, casings, rapping porcelain shafts (insulated shafts), cable terminal boxes, etc. of the suspended discharge electrode, wipe them clean, and replace the damaged insulators;

10) Check the piping system of the cleaning equipment of the continuous smoke and dust monitor, and there should be no leakage;

11) Check the light source of the smoke and dust continuous monitor, and replace it in time if it is damaged.

2) Main items of electrostatic precipitator overhaul:

1) The above-mentioned minor repair items;

2) Check the dust accumulation of the dust collector and discharge electrode, and remove the dust accumulation;

3) Check the positioning device of the dust collection plate row, and replace the damaged plate and pole wire;

4) Comprehensively check and adjust the pole distance;

5) Overhaul the rapping system and transmission device of the discharge electrode and dust collector, and overhaul the electromagnetic rapping system;

6) Remove ash in the ash hopper and suspended discharge grade insulator chamber;

7) Overhaul high and low voltage power supply equipment and control system;

8) Overhaul unloading (conveying) system;

9) Other items that need to be overhauled or replaced.

During the maintenance of the precipitator, the precipitator shall strictly implement the express provisions of the test items and cycles of high-voltage silicon rectifier transformers, low-voltage reactors, insulation supports and connecting elements, high-voltage DC cables and other equipment in the electrostatic precipitator chapter of the "Preventive Test Regulations for Power Equipment", and the performance test of the trigger device of the power supply device shall be carried out, the setting test shall be carried out on various protections, the electrical high and low voltage circuits and instrument switches shall be calibrated, and the rectifier shall be checked by the hanging core.

In addition to the above-mentioned minor repair items, the electrostatic precipitator renovation includes:

1. Check the dust accumulation of the discharge electrode and dust collection electrode, and remove the dust accumulation.

2. Check the positioning device of the dust collection plate row, and replace the damaged plate and pole wire.

3. Comprehensively check and adjust the pole distance.

4. The dust collector repairs the rapping system and transmission device of the discharge electrode and dust collection electrode.

5. Eliminate ash accumulation in ash hopper and discharge electrode insulator chamber.

6. Overhaul high and low voltage power supply equipment and control systems.