I. Quality of pulverized coal and pulverized coal fineness temperature for the next meal is an important measure of liquidity pulverized. Changed after burning bituminous coal, to ensure the safety of the milling system, the need to reduce the mill outlet temperature and improve coal fineness. Our rules of order the mill outlet temperature during normal operation to ≤90 ℃ by burning anthracite with ≤110 ℃ time, when coal fineness by burning anthracite R90≤9% to R90≤23%, while in The actual operation of the mill outlet temperature of only about 70 ℃. Reduce the mill outlet temperature, resulting in a pulverized coal into the coal storage moisture content increases, but after entering the pulverized coal storage, the temperature will be further reduced. Reduce temperature and pulverized coal fineness of pulverized coal will increase fluidity, after the next meal will cause the impeller to the powder when the poor. Poor equipment management, rainwater along the coal warehouse explosion door leak into the coal storage; coal warehouse is not tight or after milling system outage, did not close the valve so that the coal warehouse absorb moisture inside the cold inhaled, can cause pulverized coal warehouse within damp bond even agglomeration, once caking coal powder or wet pulverized powder stuck in the impeller to the next port will cause the next powder pink or no pink under uneven phenomenon. Two impeller powder machine under influence of powder impeller to wear too much pink scraper blade fracture can also cause the next cause uneven amount of powder under powder uneven. Within the coal warehouse into the sawdust and other debris will be blocked or jammed impeller powder machine will also affect the normal operation of the impeller to the powder, resulting in uneven powder or powder-free under the next. Differences in characteristics of each station to the next meal powder will cause the amount of powder to the powder under uneven. When the load automatically when cast, each station to powder machine speed is dynamic, when the load increases, to powder machine speed will automatically increase the speed to high powder, coal falling more difficult, and may will be part of the pulverized coal was brought back to the powder inside the machine to accumulate, when accumulated powder to powder machine reaches a critical state, the accumulation of pulverized coal will collapse, the amount of powder under a sudden increase. III. Once the impact pressure within the coal warehouse into powder under negative pressure during normal operation, and the next pink short tube connected to the bottom of the powder is interlinked with the primary air duct, a duct into a positive state, that powder machine internal pressure equal to the pressure of a duct. When the air pressure inside a duct to a certain extent, there will be asked powder phenomenon, this time to the next very unstable powder pink. Pressure has also asked powder pink bits and coal storage relationship, when the dust level is low, care powder pressure is relatively low, higher powder, flour care is also a corresponding increase in pressure. Due to high volatile bituminous coal, easily ahead of the fire at the burner nozzle to prevent burn burner, the factory operating procedures specified in the operation to simultaneously satisfy: a pressure ≈3000Pa, once the wind speed ≥25m / s, wind powder temperature of the mixture ≤160 ℃. The three parameters in the actual operation is difficult to meet, if they meet the requirements of wind pressure, the powder appears to have multiple care powder, leading to the absence of flour, affecting boiler with a load. So in order to meet the load requirements, the need throttle section has asked for a pink phenomenon throttle, throttle throttle powder machine once and then will cause the wind speed is low, sometimes burner ignition advance phenomenon, and in severe burn burner. Therefore, the need for frequent adjustment in operation once part throttle, increase the amount of labor and is not conducive to the safety of the burner. IV. The effect of wind powder mixer under the action of wind powder mixer impeller powder is pulverized to a powder fall uniformly mixed with the primary air, to form a more stable powder mixture concentration wind. In the long-running process, the wind will be scouring powder mixer wind friction powder mixture, especially when worn inside the shoe, scattered distribution of pulverized coal effect becomes weaker, resulting in a concentration of large deviations wind powder mixture , resulting in uneven next meal. In addition, wind powder mixer in the course of being washed after deformation under static pressure causes the powder in the tube increases, the phenomenon occurs care powder, causing the impeller powder machine powder under poor. Five burners affect coke powder due under high volatile bituminous coal, easily ahead of the fire, in order to ensure the safety of the burner, the plant operating procedures states: normal operation, the burner temperature ≤400 ℃, otherwise it should be reduced to a powder that machine speed or stop the powder to be purged. In actual operation, due to deviation from the design coal burning coal or a single large furnace flame deflection when milling operation, there will be coking phenomenon, especially burner burner mouth when coke to make smaller nozzle section, resistance increases, the static pressure before the burner primary air tube increases, resulting in uneven powder under severe primary air duct may be clogged. VI. Measures to strengthen operational adjustments milling system in the regulations to the extent permitted under the premise and guarantee the safety of the milling system to maximize the mill outlet temperature, increase the dryness of the pulverized coal, reducing coal within the coal warehouse Local bond powder caking phenomenon. VII. Tightness comprehensive inspection departments milling system, eliminating air leakage, including all blast doors, coal storage manhole cover, wood splitter, air lock, tank inspection hole coal, coal sampling holes and other equipment checked and found to block leakage point in time. Milling system outage and promptly closed coal storage moisture absorption corresponding valve to prevent cold air into the coal warehouse. VIII. Strict implementation and sawdust wood splitter sieve cleaning, proper operation, to prevent debris entering the bunker. Each coal warehouse should maintain the normal operation of the normal pink bits, and regularly carry out coal warehouse drop powder, prevent local coal warehouse illiquid pulverized coal moisture caking. Strengthen equipment management, to prevent rain, washing water from entering the bunker. Nine in the premise of ensuring the safety equipment, wind flour mixture temperature each time the wind speed adjusted according to the deviation powder, try to make each time a mixture of air duct temperature consistent, may, if necessary, to carry out a throttle throttling. X. use of large and small repair opportunity for all primary air tube wind speed leveling, to ensure parallel operation of a duct wind speed remained the same. XI. Operating personnel should always check the burner burner mouth coke, and found there to be a timely hit when coke coke. XII. The use of large and small wind powder mixer repair opportunity for sampling, serious damage replacement. 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