Under the circumstances that China's coal types are changeable and its operation is not standardized, the service life of filter bags for bag dust removal equipment is more than 20,000 hours. However, there are already examples of operation above 30,000 hours abroad. The service life of the filter bag is guaranteed to be 30,000 hours, which is selected in conjunction with 4a overhaul. How can the life of the dust removal equipment be longer and longer? Let's introduce the methods to extend the life of the bag dust removal equipment:
(l) Reduce the smoke temperature, prevent air leakage, and do a good job of debugging the cold and hot airflow distribution.
a. Overhaul the air preheater and economizer to improve its heat exchange efficiency and reduce the flue gas temperature below 150 ℃.
b. Prevent air leakage from the furnace, air preheater, flue and dust collector, reduce the oxygen content (less than 8%) in the flue gas of the dust removal equipment.
C. Dust removal equipment should be well insulated to prevent acid corrosion caused by condensation.
d. Debug the cold and hot airflow distribution.
(2) Control the injection pressure and extend the injection interval. The lower resistance of the new production equipment can appropriately reduce the injection pressure, pulse width and extend the injection interval, which is very beneficial to extend the life of the filter bag. About running la, the resistance of the filter bag will gradually stabilize, and the injection pressure can be appropriately increased and the injection interval can be shortened as required.
(3) Pre-spray the filter bag before starting. Check that the ash storage tank has sufficient ash volume, start the induced draft fan, and pre-spray the filter bag of the bag type dust removal equipment, until the surface area of the dust removal cloth bag has a layer of 2-3 mm thick dust (about 3 hours or more) before the boiler can be put into oil for ignition . To protect the filter bag, pre-spray the filter bag and check the effect of pre-spray before each boiler ignition. The ignition oil gun must be atomized well and burned completely to prevent a large number of unburned oil droplets from being brought to the furnace and causing a paste bag.
(4) During normal operation, the differential pressure of the filter bag is greater than 1500Pa (electricity + bag 1200Pa), and the cleaning is stopped at 800 and 900Pa. The typical new pressure differential bag is 1.0kPa, and it is 2.5kPa near the end of life!
(5) During normal operation of the boiler, the oxygen content in the furnace should be maintained at 2% to 3%, and the oxygen content at the inlet of the bag type dust removal equipment should be less than 8%.
(6) When the smoke exhaust temperature reaches 150 ℃, the protection alarm will be issued. The furnace can take measures such as load reduction, air supply, and induced draft. When the smoke temperature reaches 160 ℃, the second alarm will be issued. Continue to reduce the load and other measures to reduce the smoke temperature. When the alarm reaches 170 ° C, the protection action starts to spray water. Monitor the downward trend of smoke temperature, stop spraying water when it drops below 160 ° C, and continue monitoring until the smoke temperature returns to normal. If the temperature exceeds 180 ℃, the furnace should be stopped immediately.
(7) When judging from the water level, flow rate, furnace negative pressure and other parameters and hearing the leaking sound, the water-cooled wall tube is leaked, the time shall not be delayed, and the furnace shall be stopped immediately to prevent blistering. It is best to install a hygrometer at the outlet of the air preheater to detect the moisture content of the flue gas in order to detect the leak of the burst tube early and take emergency measures in advance.
(8) Prevent the unburned pulverized coal of high-volatile bituminous coal from accumulating in the dead corner of flue and dust removal equipment, or sudden fire extinguishing of the boiler to cause secondary combustion after the pulverized coal is drawn to the furnace. When the dust removal equipment inlet temperature is found to suddenly rise a lot , Immediately stop the furnace immediately, take measures such as stopping induced draft fans, skipping fans and feeding powder.
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