Small boiler precipitator

(1) the use of advanced technology diversion smoke, entering the respective filter chamber smoke uniform distribution, which is an important measure to ensure that the filter has a high efficiency. Infusion Technology includes a total of three parts: cascading into the wind deflector technology, hopper baffle technology and flue elbow deflector technology. (2) The hopper automatic electric heater to ensure no dust condensation within the hopper, reduce corrosion and prevent dust bypass clogged. Electric heater is turned on automatically when the hopper temperature below the set value, automatically closes higher than the set value. (3) with built-in bypass flue when the flue gas temperature is too low and too high, the bypass stack will automatically open, while closing the inlet valve of each chamber precipitator, the flue gas into the chimney flue through bypass in order to avoid condensation is acid corrosion in the flue gas temperature is high, the bag is burned or flue gas temperature is low. (4) a combination of high-capacity injection technology for efficient cleaning. (5) The PLC program control technology, the pulse valve, the valve off, discharging device, bypass valve, hopper heater and other equipment for control. (6) bag selection 500 g / m2 or more media production, with the bags inside the bag support cage plus galvanized carbon steel, automatic welding production line, ensure welding strength and smooth burr, so as not to damage the filter bag. (7) The use of efficient pulse cleaning dust, gas source for compressed air pulse valve operation is (or set time) under the control of the PLC in order to set the automatic start and stop of the pressure difference between the inside and outside the bag. Small and medium sized coal-fired boiler using a baghouse Attention some small problem in baghouse installation and use in the Federation, but these problems will seriously affect the efficiency of the baghouse, will bring some economic losses, for which we should actively control problems, ensure the installation quality. 1. Common Problems (1) bag filter outlet excessive dust emissions (black smoke discharge port), environmental pollution, and waste of energy, meet environmental protection requirements, the performance of baghouse inefficiencies. (2) often due to lack of baghouse gas flow restriction, reach rating, resulting in decreased output of milling system, increased milling power consumption. (3) The bag is easy to fire, seriously affecting the safe operation of the unit. (4) low temperature corrosion serious bag filter housing, bag short life, repair and maintenance workload, high maintenance costs. 2. Common Problems Cause analysis in general, cause difficulty running baghouse factors often occurs the failure of more, but there are mainly the following reasons: (1) Because the maximum temperature capability bag 150e, Operation Adjustment Poor or naturally accumulated powder bag bag will cause a fire burned. (2) Since the coarse separator cone inside the air lock, a coarse powder separator back to the air lock tube, under fine powder separator air lock is not tight, meal splitter off the poor and to adjust the shutter system leakage and other reasons, the coarse separator, fine separator efficiency decrease, resulting in entering the baghouse dust concentration exceeds the design value of 70 g / Nm3, resulting in overloaded bag filter efficiency falls. In addition, the milling system overload, also led baghouse overloaded. (3) Since the milling system uses the lower part of the hearth burners extraction flue gas temperature and blended tone warmed secondary air as part of the milling media, inevitably SO2, SO3, water vapor and other substances in the flue gas, adding the The reason is often lack of temperature below the dew point temperature, lack of gas must have Asia *, * and other corrosive substances generated and thus low temperature bag filter housing and rear pipe corrosion is inevitable. (4) milling system is running, the mill outlet temperature is normal medium 100e, 130e above or below the 90e system will automatically shutdown. Visible, temperature milling medium must in a certain range, too easy to knock the pulverized coal, bag easy to fire burned; drop too low, the drying capacity, coal moist, easy to stick in the bag, causing lack of air flow is reduced, system powder output decline, while increasing the low temperature corrosion. However, since the pulverizing system of flue gas extraction itself contains water vapor (combustion products), as well as coal water weight, rapping air with water, lack of gas there must be a lot of water, and the bag filter and rear lack of gas pipeline is the only emission is water vapor mouth, run in normal temperature 100e, coupled with the baghouse cabinets due to low temperature corrosion lack of further reducing leakage into the cold air temperature, so that it is below the flue gas dew point temperature Junction Lu, and these eventually all the water gathered in the lack of gas, pulverized coal becomes wet, easily stick in the bag resulting in reduced through-flow cross-section, ventilation resistance is increased, the lack of air flow is reduced, milling system output decline , milling power consumption increases. 3. Question improvements (1) improve their health baghouse First, the use of treated water through the bag, which uses imported into Australia needle felt polyacrylic acid plus PRIMACELL surface coating 3520P bag, bag of improved resistance to moisture , anti accumulated powder capability, greatly improving the reliability of bag filter operation. Second, in the overhaul, the use of corrosion-resistant steel Cowden replace all the transformation baghouse housing, improved corrosion resistance to low temperature to prevent cold air from leaking into the deterioration of the baghouse operating environment. Third, will the original run unreliable baghouse CO2 extinguishing systems to transform, to make it reliable, and ready to rescue, to baghouse to provide security. Fourth, in the baghouse installation of a lack of import and export gas temperature alarm system, help operators to monitor, noted that there is danger immediately put a fire extinguishing system or take appropriate measures to ensure the safety of the device. (2) create a favorable external environment for the bag filter one run to minimize the natural moisture coal. Pay close attention to coal-fired management, requiring fuel plant at any time with a dry coal, and make full use of dry coal shed and mixed coal deposit dry coal storage systems, to prepare for the rainy season backup, in order to reduce the moisture into the milling system. Second, air bag filter system installed rapping dehumidifier. Rapping bag filter system with compressed air have the phenomenon of water, although the amount is small, but over time can not be ignored, after the installation of the dehumidifier, the phenomenon of compressed air with water was reduced. Third, improve the coarse separator, fine separator efficiency, try to avoid milling system overload, bag filter to prevent overload. In maintenance, in addition to greater efforts to eliminate milling pipeline leak, but also recognized that air lock within Tightness of coarse separator, fine separator efficiency have a greater impact, organizational someone check meal inner cone lock gas separator, coarse separator return air lock air lock powder wait for the next meal and powder tube lock gas separator rigor, and to transform part of the air lock to ensure that all air lock is tight, the baghouse inlet dust concentration of control in the design value of the medium level of about 70 g / Nm3, effectively improve the efficiency of the baghouse. Also, take advantage of opportunities overhaul, repair Classifier thorough examination of the deflector, ensure flexible and adjustable baffle adjusted to accurately locate and adhere to overhaul milling after each test system performance tuning, make the system media flow rate within design, and ensure that all fines separator load balancing, coal fineness reach the design value, so that the whole system is running stable economic conditions. In addition to the above points, the use of bag filter in small and medium sized coal-fired boiler process should give full play to the human factor, should pay attention to the following points: First, shorten the inspection, maintenance intervals, found the manual removal of accumulated powder grave, found damaged bag or end-of life in time to replace it, can prevent spontaneous combustion of accumulated powder burn bag, but also to ensure the efficiency of dust collector. Second, ground tour operators, ground inspection, there is danger immediately put a fire extinguishing system or take appropriate measures to ensure the safety of the device. Finally, in the overhaul, the complete replacement of the bag end of life.