The method of regulating boiler combustion is to adjust the vibration frequency and vibration period of the vibrating grate. Because the vibration frequency of the vibrating grate usually does not change with the load. Frequency was observed in the ash thickness measured on the low slag plate. When the particle size, water and load of fuel change, only the time and time of vibration are adjusted, and usually the vibration frequency is not changed.
Gas fired boiler During operation, the combustion shall be stable, the furnace negative pressure shall be maintained between - 50 and - 100Pa, and positive pressure operation is not allowed. The boiler evaporation capacity shall not exceed its rated load. The water level of the steam drum shall be kept ± 50mm, not more than ± 75mm, the steam pressure at the superheater outlet shall be kept at 3.4 ± 0.1MPa, the steam temperature at the superheater outlet shall be kept at 440 ± 10 ℃, and the feedwater temperature shall not be less than 104 ℃.
The frequency of vibrating grate has three main factors: first, determine the thickness of the slag layer in the low ash furnace, which should generally be 5-10cm; The second is to change the negative pressure of the furnace under the vibration frequency; Third, the normal carbon content at the outlet of the ash detector should be 5-10% carbon. Therefore, the vibrating grate should be between 40 and 45 Hz.
The operation of gas-fired boiler is greatly affected by the instantaneous change of gas pressure and flow. During the operation adjustment, the operator requires to timely adjust the gas flow to fluctuate within a small range with the change of gas pressure, effectively adjust the combustion condition in the boiler to be stable, control the change range of boiler output within a small range, and ensure the stability of parameters through fine adjustment and fine adjustment. When the gas nozzle is put into operation, it shall be put into operation symmetrically as far as possible, and there shall not be more than one operating nozzle on both sides. In order to maintain stable combustion, when the load is lower than 50% of the rated load, increase the input of coke oven gas for stable combustion.
Do a good job Gas fired boiler Furnace flame monitoring. The furnace flame monitor shall be used to monitor the furnace flame. The flame combustion shall be stable, free from chaos, and the flame color shall be clear. The flame color of the full combustion of blast furnace gas is light blue, the flame fullness is good, the water wall tube is not washed, and the tangential circle shape of the four corners is uniform.
