Why can’t the secondary voltage be increased in coal tar electrostatic precipitators?
Thread Content
I have a tar electronic precipitator with a processing capacity of 30,000; currently its processing capacity is less than 10,000. However, the secondary voltage cannot be increased – whenever it tries to rise, discharge occurs quite significantly. Could someone help me analyze the reasons? Thank you! !
The cylinder is grounded; use a 2500V megohmmeter to check the insulation resistance.
Insulation is insufficient, causing tip discharge; perform a no-load test to locate the discharge point and address it. Make sure to check whether the verticality of the electrostatic tar catcher is within the specified limits.
Connection diagram: General case – Voltage: honeycomb tube; Current: corona wire
Open it to check for any broken electrode wires and grounding issues
Common reasons for the inability to increase the secondary voltage: 1. If discharge is occurring, in the case of honeycomb structures, it is usually due to the accumulation of impurities and tar deposits on the electrode wires and honeycomb walls; this issue can be resolved by cleaning with steam once power is restored； 2. Check the electrical system: Verify whether the temperature of the high-voltage inlet insulating sleeve is above 90 degrees during operation; or shut down the system and inspect the insulating bottle to check for any signs of breakdown. If there is damage or breakdown, replace it accordingly. 3. Stop the machine to check whether there has been any change in the distance between the electrode wire and the honeycomb wall; adjust it if there is a deviation from the initial installation dimensions (as specified in the technical specifications).
It was explained very clearly upstairs; I’m just saying something random. Although electrostatic precipitators have dust removal capabilities, excessive mineral dust in the gas can cause high-voltage discharges within these devices; the electrostatic precipitators may operate, but it’s not possible to achieve a high operating level. Generally, the issues are high-pressure ammonia operation, overly fine coal crushing, or poor quality of flat coal. Of course, the coke oven cannot be controlled, so it is recommended to increase the frequency of changing the liquid used for spraying in the upper section of the primary cooler. There is less naphthalene precipitation in the upper stage, so the oil content in the spraying liquid requires to be low; large amounts of ammonia water are used for replacement
The electrodes are coated with tar, resulting in a corona seal
The handling method is as follows: First, rule out any issues with the ceramic bottle at the top; then rinse the electrostatic precipitator with large amounts of ammonia solution. If the insulation level remains low, use steam to clean the electrostatic precipitator. If that doesn’t work, maintenance will be necessary to check whether the drill wire is in place or has fallen out