In the case of thyristor rectification, temperature has an effect on its operating characteristics and life, so it is necessary to pay attention to the temperature rise around the thyristor. The thyristor rectifier is stored in the sump, and since it is often cooled by insulating oil or the like, there is no problem of temperature rise, but attention should be paid to contamination by a moisture absorbing respirator or the like. If the moisture absorbing respirator is contaminated, moisture, etc. enters the insulating oil of the sump, which often causes insulation deterioration.
(2) Excretion of acid mist
For the lead electric mist eliminator, the acid mist trapped is gradually discharged as a discharge liquid from the lower part of the room to the outside. Since the metal compound or the like in the discharge liquid may block the discharge pipe, causing acid accumulation in the intake chamber to cause an increase in gas resistance, care needs to be taken.
(3) Dust collection room
In the dust removal device, the gas temperature will cause chemical corrosion below the dew point. If the H20-H2SO4 condensation causes leakage on the surface of the insulator, or adheres dust on the electrode line, or forms an insulating coating film, the gas temperature should be kept at all times. Above the dew point. On the other hand, attention should also be paid to failures due to thermal stress of the member at a high temperature of 500 ° C or higher. In general, it is desirable to operate at a temperature of about 50 ° C higher than the dew point of the mixed gas containing S02 and SO3.
For the electric defogger, in order to prevent the efficiency from decreasing, it is desirable to operate at a temperature of 40 ° C or lower.
(4) Cleaning of the defogging chamber
After the long-term operation of the demisting chamber, the dust removal efficiency is gradually reduced. Therefore, cleaning must be turned on at an appropriate time. The periodic cleaning cycle is determined by the type of mine, the type of roaster, and the operating conditions.
(5) Insulating oil for oil seal
When the lead-type electric mist eliminator uses an oil seal, the insulating oil directly contacts the outside air and the furnace gas, so dust, acid mist, moisture, and the like enter, and the insulation becomes very bad. Since the liquid level discharge or suspended dust bridge flashes and cannot apply a high voltage, fire and discharge may occur, and a fire may occur. Therefore, insulation oil with good insulation should be used as much as possible. In addition, it is necessary to perform the insulation endurance test and the operation of removing the mixed moisture regularly. The insulating oil after long-term use needs to be replaced and regenerated once in 1 to 2 years due to deterioration of insulation capacity.
(6) Insulating porcelain bottles
Destruction and cracking of insulated porcelain bottles occur frequently, which may result in the inability to apply high voltage or power. The reason is as follows.
Condensation leakage: Since the temperature of the dust collection chamber is reduced during operation, SOs condense on the surface and leakage occurs frequently, so it must be operated at an appropriate temperature (outlet 300 ° C). Destruction during installation work: Care must be taken during installation work, and care must be taken not to bump or install properly.
(7) Replacement of discharge electrode
The discharge electrode of the lead electric mist eliminator is broken due to dust adhesion, formation of the insulating film and corrosion, poor installation quality, or replacement due to impossible correction of bending. When sulfur ore and zinc ore are used, the discharge electrode often has an insulating film. It is usually replaced once every 1-5 years. The reason why the discharge electrode of the defogging device is replaced is also generally required to be replaced when the star-shaped protruding portion of the dust removing device is severely damaged.
The desulfurization dust collector regularly cleans the accumulated ash in the sedimentation tank and keeps the cleanliness of the circulating water as much as possible. If the desulfurization efficiency is required to be above 80%, the lye must be added to the circulating pool at regular intervals to keep the PH value of the circulating water at 9 or above. In the sedimentation tank, the acidic wastewater and the added alkali water and the precipitate are filtered and recycled.
The temperature of the lead defogger depends on two factors, the first is the maximum temperature of the filter material, and the second is that the gas temperature must be above the dew point temperature. At present, due to the large selection of glass fiber filter materials, the maximum use temperature can reach 280 ° C, for the gas above this temperature must take cooling measures, for the gas below the dew point temperature must take warming measures. At present, there are many PPS filter materials, and the temperature is 170 degrees. For the boiler desulfurization dust collector, the relationship between the use temperature and the dust removal efficiency is not obvious, which is different from the electric dust removal.
The dedusting of ammonia desulfurization boiler not only eliminates the damage but also harms it. It can also produce by-products that are beneficial to humans. The boiler dust removal equipment turns the acid rain that damages the land and crops into the fertilizer of farmers. The ammonia desulfurization process is similar to the common limestone gypsum process, but the by-products produced are different.
The lead electric defogger has the advantages of small size, light weight, small floor space, low resistance, water saving, power saving and low operating cost. The lead defogger can not be used for daily maintenance in use, because it is used for desulfurization and dedusting. When the device is running, the airflow in the body will form eddy currents. Once the eddy current is formed, it can hardly be eliminated. Especially when the temperature of the dusty gas changes, the speed changes, and the condensation that may form on the pipe wall, the dust will deposit in the dust collector. .