Tail secondary combustion flue how to deal with the phenomenon of a sharp increase in rear of the boiler flue secondary combustion flue temperature location and later. 2, the furnace, the flue abrupt change in negative pressure, flue gas is not tight at the smoke, the Mars. 3, air preheater large current swing bearing housing temperature, severe Jam occurs. 4, air preheater fire alarm issue. 5, steam temperature, economizer outlet water temperature, the air temperature rises abnormally. 6, induced draft fan vanes automatically open a large, Fan current rise. 7, as the combustion side, both sides of the smoke temperature difference increases. Reason 1, through the coarse fine grinding coal, coal poor uniformity, improper adjustment of combustion, combustion of fuel is insufficient, serious mechanical incomplete combustion, and high levels of combustible ash accumulated in the back pass. 2, an oil burner or an oil poor atomization, so that unburned droplets deposited in the flue. 3, prolonged low load operation of boiler, the furnace temperature is too low or too small amount of excess air resulting in incomplete combustion of coal or oil accumulated in the tail. 4, after the shutdown of the fuel leakage into the furnace and accumulates or after shutdown and to insufficient MFT furnace purge unburnt coal or oil accumulation at the end of the tail. 5, soot blower failure, long-term put into operation is not normal. 1 process, when a slight secondary combustion, exhaust gas temperature does not rise within 20 ℃ normal smoking temperature should be checked immediately paragraphs, the combustion site and judge whether the secondary steam soot blowing. (When the exhaust gas temperature rises to 250 ℃) 2, the operation of the back pass and then generating boiler combustion boiler operation should be stopped immediately, immediately stop sending, ID fan and turn off all the smoke and steam soot blowing air damper fire. 3, if the economizer afterburning, until the storage tank level control valve blocking off without pressure, flow rate of feed pump motor start 150t / h Sheung be cooled. 4, air preheater heating surface of the secondary combustion air preheater normal operation, normal operation of the air pre-heater holder; air preheater Jam occurs, the main drive motor and the auxiliary drive motor trip, contact maintenance manual plate moving continuous air preheater rotor. Soot blowing steam into air preheater for extinguishing, into the air preheater for fire extinguishing can not be extinguished. 5, the economizer outlet water temperature close to the inlet temperature (at the economizer secondary combustion), the air preheater inlet gas temperature, exhaust gas temperature, the hot air temperature is lowered to less 80 ℃, each one hole, and the hole is no longer Mars smoke and soot blowing steam stops coming out after water or fire. Open hole inspection manhole and inspection to confirm the secondary combustion goes out, after the flue vent door open to drain water inside the smoke flue opening for ventilation air damper. 6, to be re-combustion is resolved, the flue temperature does not rise and fall when stabilized, before slow regulation of the air, smoke baffle, the necessary air cooling and purging.
To better implement the "Blue Sky Hongshan win the Battle of three-year action plan to implement the program," the job requirements, Hongshan Environmental Protection Agency to ban high-pollution fuel combustion zone 10 steam tons / hour coal-fired boilers to carry out a special regulation, and issued the relevant units of the "notice on deadline out of 10 steam tons / hour of coal-fired boilers."
May 5, the District Environmental Protection Bureau, Jia Guangsheng nuclear industry two hundred forty-three Brigade, WONG-school and other relevant units after receiving the notice from coal-fired boilers out of progress were examined, the examination requires companies to accelerate the implementation of the main responsibility, solid promote renovation work, to ensure the completion of coal-fired boilers out of the task on time.
Gas-fired 100 t h steam boiler dual fuel oils can be cleaned during cleaning using efficient and environmentally friendly non-corrosive detergents. This will cause the tube to expose the primary color of the metal and reduce the impact of dirt and bio-algal sludge. After ignition of gas-fired steam boiler, attention should be paid to observing the furnace temperature and the temperature of the main steam. With the increase of main steam pressure, the flue gas temperature of boiler is obviously increased after ignition. If the temperature does not rise, you should go to the scene immediately to inspect the oil gun fire. The scale thermal conductivity of a gas-fired steam boiler is only 1/10 of that of steel. This hinders heat transfer when it scales on a heated surface. In order to keep the boiler in use The output shall increase the temperature on the combustion side. The increase of outlet temperature of gas-fired steam boiler increases the loss of gas-fired steam boiler, and the scale on the water wall of equipment will effectively reduce the heat transfer effect, which may lead to the increase of the temperature of water wall and the burst of water wall. When a gas-fired steam boiler is in operation, a series of chemical and physical reactions will occur in the furnace. In use, it will effectively form a hard and dense scale on the heated surface, which will directly lead to its heat exchange. The reduced efficiency and corrosion due to scale will reduce the heat absorption of gas-fired boilers.
Primary air tube blockage is what causes? How to prevent? Reason: 1) blocked or coked-burner fire nozzle inlet is blocked portion of small oil gun and other debris. 2) too many impurities coal, powder machine speed is too high, the pulverized coal and primary air speed too low. 3) powder machine speed is too high, too much under the powder without timely blown away. 4) a low pressure (throttle open or not to open too small), can not take away meal. Precautions: 1) to the powder and the rotational speed of the unit load and adjust relevant primary pressure according to the powder not more than 700 rpm rotation speed, a wind speed of each holding 25 ~ 30m / s, the mixed primary air temperature was controlled at 180 to 250 ℃, a pressure depending on the load, depending on coal, in the range 2.5 ~ 3.8kPa. 2) find a wind speed is too low, the primary air temperature is lower than the normal value should be to lower the rotation speed corresponding to the normal to the powder of a primary air temperature and wind speed. 3) open, gas 100 t h steam boiler dual fuel oil tank should be fully cut-off torch powder, the powder in the tube is blown accumulated powder. 4) Fire mouth clogged or coked should try to remove. What causes large vibrations induced draft fan? 1) motor bearings in oil, resulting in large vibration and bearing wear; 2) even when the shaft is mounted on the center not good; 3) induced draft fan stall surge; 4) anchor bolt loosening induced draft fan; 5) blade fouling or wear ,lost balance.
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