Solutions to refractory brick shedding used in boiler

Because the boiler pouring material and refractory material damage loss, seriously affect the safe operation of the unit, and even cause non stop accident unit.

In order to ensure the long-term safe operation of the boiler, take the following measures from the operation of the adjustment

• Ignition methods.

1. The ignition temperature process, control the bed temperature and the outlet of the furnace, cyclone separator leg temperature change rate of not more than 80 ℃ / h.
2. By adjusting the fuel door or throttle back to change the oil amount, strengthen with the wind, to maintain the best air fuel ratio, temperature less than 700 ℃ burner piping.
3.  Maintain a volume greater than the minimum fluidizing air flow rate, gas temperature rise faster, by increasing the rise velocity of two air control flue temperature does not exceed the specified value.
4. Bed temperature at 330 ～ 350 ℃ with coal feeding conditions using dynamic way to coal, while adding one or two times volume control the bed temperature and gas temperature from rising too fast, strict monitoring, control the bed temperature and gas temperature change, and the change trend of monitoring oxygen master advanced quantity control the quantity of coal. When the cyclone separator population temperature changes smoothly, gradually changed to continuous coal, used to add less, more in the way of increasing coal, so as to control the bed temperature of furnace outlet flue gas temperature and avoid large fluctuations, reduced the refractories shedding

•    Furnace measures

1. Boiler shutdown process, control the bed temperature, strict furnace exit flue gas temperature drop speed of not more than 80 ℃ / h.
   
2. Slide stop, bed temperature and steam temperature, steam synchronization downhill, by adding one or two times volume decreased bed temperature, to avoid the high bed temperature shutdown period. When the bed temperature below 550 ℃ and the decreasing speed stop to the coal will be a volume is reduced to the minimum fluidizing air flow rate, the two volume is reduced to the minimum, avoid bed temperature drops too fast.
3. Boiler flameout, bed temperature should stop one or two wind turbines operating in more than 400 ℃, prevent the abrupt cooling, fan ventilation and stop running.
4. Fan stops running 4h, bed temperature below 400 ℃ can start fan cooling.

In the boiler start stop, peak shaving, machine breakdown and unit load rejection, strict control of smoke temperature change rate, thus pouring material and refractory protection is not damaged