Combustion in furnace is a rather complicated physical and chemical process. Combustion intensity-combustion speed ω refers to the amount of fuel burned per unit time. It is not only related to fuel type, furnace temperature, furnace structure and many other factors, but also closely related to furnace ventilation. Let's first look at the relationship between ω and ventilation when the boiler actually burns. Not long ago, we conducted repeated tests on a DZL6- 16p boiler. The experiment shows that: (1) when the surface pressure of the furnace is p =-(2 ~ 3) kPa (that is, the blower stops, the induced draft fan runs, and the opening of the air inlet door is 80%), the flame in the furnace is dark yellow and weak, the amount of cold air leaking into the furnace increases, and the smoke in the chimney is weak. (2) When the surface pressure of the furnace is p =-(20 ~ 30) Pa (this is the normal operating pressure of the furnace, the blower is running, the throttle opening is 70%, and the induced draft fan is running at 80% of the throttle opening), the furnace is in a strong combustion state, the maximum length of the flame is 3m, and the smoke from the chimney is white. (3) When the surface pressure of the furnace is p=0 (the steam drum and induced draft fan are all stopped, and the air door is fully closed), the furnace is under pressure, and when the coal seam spontaneously ignites, plumes of smoke are emitted from the chimney. (4) When the furnace surface pressure p =11115 kPa (blower running, throttle opening 70%), the flame in the furnace is orange, which will cause the refractory of the furnace arch to crack and collapse. So, it has something to do with stress. In other words, the difference between the two groups of combustion lies in the flow of air. The first group was deprived of oxygen and could not be ignited. The second group of air flows too fast to touch the fuel. It's that simple.

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