Space positioning of burner in cement rotary kiln

During normal operation, the burner's spatial positioning protects the kiln surface. Life cycle of refractory materials. Barrel temperature and clinker quality will have a great impact.

Generally speaking, the front fulcrum of the burner is the centering point, and the back fulcrum is the controllable point. With the up, down, left and right adjustment of the rear fulcrum, the Angle between the center line of the burner and kiln barrel changes; The forward and backward movement of the burner car can change the distance of the burner into the kiln.

Burner datum positioning

1. Push the burner into the kiln and ensure that the burner port is flush with the kiln mouth. Adjust the rear fulcrum of the burner to ensure that the center of the burner port coincides with the center of the kiln mouth.

2. Measure the levelness of the burner with a level or ruler. If it is not horizontal, the height of the front fulcrum shall be changed, the height of the front fulcrum to be changed shall be calculated, and the support height of the front fulcrum shall be corrected until clause 1 and burner level are satisfied.

3. Verify the distance of the light column in the kiln with the light column method, which should be equal to the length (slope) calculated according to the slope of the kiln barrel and the inner diameter of the kiln = the inner diameter of the kiln /2L, and the intersection of L kiln and the center line of the burner along the long direction).

Position of burner after feeding

1. Manually look at the fire from the kiln mouth and adjust the burner position slightly according to the flame position to ensure that the burner position is slightly deviated. If too close to the location of the burner from material, flame resistance materials, materials, lead to combustion, incomplete combustion of pulverized coal by rolling material package, burn into reducing atmosphere is serious, ferric iron reduction in the material into bivalent iron, form yellow heart material, reduce the clinker quality, to restore serious furnace gases in the atmosphere to the preheater system, The material entering the preheater is mixed with reducing gas, which reduces the liquid phase temperature of the material and makes the preheater system spalling or even blocking, affecting the normal calcination of the kiln. If the position of the burner is too high, the flame will be rushed into the kiln skin, and the local temperature of the cylinder body is too high, which reduces the service life of the kiln lining, and the kiln skin with firing will extend backward, and the thermal system in the kiln will be chaotic. In severe cases, the feed and calcination will soon result in a red kiln.

2. The kiln skin is basically formed after 48 hours of operation. At this point, the position of the burner should be fine-tuned again according to the temperature distribution of the kiln. (in the case of normal flame shape) if the temperature in the front of the combustion belt is high, the temperature in the back of the combustion belt is normal, the position of the burner is far away from the material; If the temperature at the back of the combustion belt is low, the size of kiln clinker is different, the particles are not uniform, and the burner head position is too low; If the temperature at the back of the combustion belt is high, the temperature of the solid reaction belt body is high, or even above 380℃, the position of the burner head is too high; If the temperature of the firing zone is low, the temperature of the transition zone is not high, and the kiln skin of the firing zone is thicker, it indicates that the burner is too close to the material.