The main causes of common failures of coal boiler bag filter are:
1. the efficiency of the coarse powder separator and the fine powder separator is reduced because of the inner cone gas lock in the coarse powder separator, the gas locking device in the coarse powder separator, the imprecision of the powder locking device under the fine powder separator, the poor adjustment of the baffle baffle and the leakage of the system, and the dust concentration of the bag dust collector exceeds the design value of 70. G/ N m3 caused the boiler bag filter to run overloaded and the efficiency decreased naturally. In addition, the overload operation of the pulverizing system also results in the overload operation of the bag filter.
2. because of the highest temperature tolerance of the bag dust collector for coal-fired boiler bag, the best temperature tolerance is 150. Poor adjustment in operation or powder accumulation in bags can cause the bag to burn down.
3. when the pulverizing system of the boiler bag dust collector is running, the normal temperature of the outlet medium of the pulverizer is 100 C (the temperature of the medium of the bag dust collector is less than 100 degrees C), and the system will be automatically stopped at higher than 130 or below 90. It can be seen that the temperature of the pulverizing medium must be in a certain range, the pulverized coal is easily deflagrated and the cloth bag is easy to burn up, the drying capacity is reduced, the pulverized coal is wet, and it is easy to stick on the cloth bag, which causes the decrease of the exhaust gas flow, the decrease of the pulverizing power and the aggravation of the low temperature corrosion. However, because the furnace smoke extracted by the pulverizing system itself contains water vapor (combustion production product), as well as the heavy water of the raw coal and the vibration of the air with water, there is a great amount of water in the exhaust gas.
And the bag dust collector and its rear pipe are the only exhaust gas of the exhaust gas and water vapor. The normal temperature of the operation is 100 C, and the temperature of the exhaust gas is further reduced by the leakage of the bag dust collector into the cold wind, which is lower than the dew point temperature, and the water is finally gathered in the exhausted gas. To make the pulverized coal wet, it is very easy to stick to the cloth bag and lead to the decrease of the flow cross section, the increase of ventilation resistance, the decrease of the exhaust gas flow, the drop of the pulverizing system and the increase of the power consumption of the pulverizing system.
4. because the pulverizing system is used to extract the medium temperature furnace smoke in the lower part of the burners in the furnace burner and mix part of the warm two wind as the pulverizing medium, the SO2, SO3, steam and other substances are unavoidable in the furnace smoke, and the exhaust gas temperature is often lower than the dew point temperature, and the corrosive substances such as sulphuric acid and sulfuric acid must be produced in the exhaust gas. Therefore, the low temperature corrosion of the box and the rear pipe of the bag filter is inevitable.
Create a good external environment for the operation of bag filter in coal-fired boiler:
1. as far as possible to reduce the natural water in the raw coal. In order to reduce the amount of water entering the pulverizing system, the coal management should be paid more attention to, and the fuel workshop is required to dry coal at any time, and the dry coal is fully used in the dry coal shed and the mixed coal warehouse for reserve in the rainy season.
2. the boiler bag filter and rapping system add compressed air to the dehumidification device.
There is a water phenomenon in the compressed air of the vibrator system of the bag filter. Although the amount is small, it can not be ignored as time goes on. After adding dehumidifier, the phenomenon of compressed air water is obviously reduced.
3. improve the efficiency of coarse powder separator and fine powder separator, try to avoid overload operation of the pulverizing system and prevent overloading operation of boiler bag filter.
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