How to determine the rotary kiln size and output?

Product introduction:https://www.lvssn.com/bruning/Rotary-kiln.html

Reasonable determination of the size of rotary kiln has a direct impact on the output of the kiln, and the output of rotary kiln is an important index of the process design of cement factory, which plays a key role in the selection of other equipment in cement factory.How to determine the rotary kiln size and output?

 

1. Confirm the specifications and dimensions of rotary kiln

There are many factors that affect the output of rotary kiln, such as the type and size of rotary kiln, the supporting conditions of cooling machine, preheater, decomposition furnace and other equipment, the composition and quality of raw fuel, the variety of clinker, operating level, operating rate and so on.However, for the rotary kiln itself, the direct factor that determines its output is the size of the rotary kiln, namely its diameter and length, while other factors are relatively objective and variable, which can only make the production capacity of the rotary kiln fluctuate within a certain range with different conditions.

The size (diameter, length or aspect ratio) of the rotary kiln must be reasonably determined when the newly designed rotary kiln or the old rotary kiln is reconstructed.As the type and size of rotary kiln are different, the unit output index of kiln is also different. At present, when determining the size of kiln, it is generally calculated according to the reasonable output index of unit clinker.

 

2. Calibration of rotary kiln output

The output of rotary kiln is the basis to determine the production scale, raw material and fuel consumption quota, and the equipment selection design of the whole plant.

The output calibration should be the reasonable output achieved by the rotary kiln under the condition of ensuring high quality, low consumption and long-term safe operation. If the output calibration of the kiln is too low or too high, the whole system will not be matched and the production operation will be unbalanced.

 

If the calibration is too low, small selection may occur in the design and calculation of other attached equipment, which may limit the production capacity of rotary kiln after production.

If the calibration is too high, the selection type of the attached machine may be too large, while the actual output of the rotary kiln cannot reach, resulting in waste of equipment capacity.At the same time to the kiln production standards bring difficulties.

The page source:https://www.lvssn.com/Product/How-to-determine-the-rotary-kiln-size-and-output.html

Solution to the collapse problem of the air duct caused by raw material vertical grinding

Product introduction:https://www.lvssn.com/mill/Raw-material-vertical-mill.html

The raw material grinding mill of 7200t/d production line of a certain company adopts two vertical mills, model jlm7-46.4, and the output is 320t/h when designing the mill, and the output is increased to 360t/h when optimizing the process parameters.Due to the small inclination of the vertical mill outlet pipe, the design Angle is 30°. During normal operation, the outlet pipe frequently accumulates materials, and after enrichment to a certain degree, the collapse occurs. In serious cases, the vertical mill directly stops vibrating, which has a great impact on the equipment.Moreover, starting up after shutdown will increase the power consumption of grinding machine, which has a great influence on the production quality.In order to ensure the normal operation of the equipment, the solution of the collapse problem of the raw material vertical mill air pipe is determined to improve the reliability of the equipment.

 

1. Windpipe collapse reconstruction plan of fresh material vertical grinding

In the raw material A vertical mill and B vertical mill air outlet pipe, add an air charging box, remove the bottom equipment of the 2 vertical mill air outlet pipe and add 4 sets of ceramic air charging box with A width of 480mm (2 sets for each grinding system), wear resistant bolts and flanges, and add A chiller fan of 6110Pa, 2840r/min, 5.5kw and 1257m cubed /h for each of the 2 vertical mill air outlet pipe.
 

Specific plan:

 

Two rows of 9.5m long open chute shall be installed in the pipe, with the width of each row of chute 480mm, the spacing of the two rows of chute 180mm, and the chute 300mm away from the bottom pipe.To avoid the chute wear faster, add a perforated plate at the top of the chute to reduce the impact of materials and wind on the canvas.The installation position of the fan is the cement platform below the cyclone cylinder of the vertical grinding wind pipe, and the diameter of the wind pipe is 150mm.

Through the final transformation, the problem of vibration shutdown of the mill caused by collapse of the export pipeline is completely solved, the reliability of the equipment operation is improved, the labor intensity of the post is reduced, the cost of shutdown caused by collapse is reduced, and the cost is saved.
 

2. Process operation control after modification

 

Due to the high storage position of homogenized raw materials, a mill is arranged to run under normal conditions to avoid peak during the day. After shutdown, the hot air baffle into the vertical mill is generally closed to avoid air leakage in the system.Due to the large feeding amount of the kiln system, it is easy to accumulate materials in the pipeline after the hot air baffle is closed. In the process of opening grinding, the accumulated materials are easy to collapse from the hot air baffle and enter the human slag discharge pit through the raw material mill.

Before starting grinding, start the vertical mill slag discharge system and force the circulation fan to draw air. At first, the speed of the concentrator should be set at a low 15Hz. Gradually open the hot air baffle at a rate of 3% each time and at an interval of 1min(gradually open to 99%, the process should be slow).Avoid the occurrence of caving when the hot air baffle is closed.

To reform the mill, the wind pipe inner and process control slurry vertical mill by vibration fault eliminate stopped, collapse of the effect of reduced due to the collapse of material on the equipment, reducing the key the increased cost of electricity, reduce the labor intensity of the jobs, let the enterprise realize the authors from the real efficiency, guarantee the safe and stable operation of the system.

The page source:https://www.lvssn.com/Industry/Solution-to-the-collapse-problem-of-the-air-duct-caused-by-raw-material-vertical-grinding.html

Optimized efficiency of kaolin rotary kiln

Product introduction:https://www.cementepc.net/burning/Kaolin-dryer.html

In order to optimize the process of kaolin rotary kiln, it is important not only to consider the process flow, but also to choose a reliable manufacturer. There are strict requirements on the reasonable spacing and inspection space of kaolin rotary kiln. The optimized efficiency effect of kaolin rotary kiln mainly includes the following points:

1. Working principle of kaolin rotary kiln

(1) the kaolin rotary kiln operates at high temperature under heavy load alternating and slow speed. The maintenance of the attached equipment and the level of thermal system control are related to the safety and efficiency of the rotary kiln operation.

(2) the maintenance of transmission device focuses on lubrication, running state, dynamic detection and meshing accuracy of gears;

(3) the installation accuracy of the supporting device determines the safe and reliable operation of the rotary kiln. During operation, reasonable control should be paid to the distribution of bearing capacity of each supporting wheel, the arrangement of supporting wheel, the upper and lower pressure and time of the hydraulic retaining wheel, the stress of supporting wheel, and the gap between the belt and the backing plate.

(4) the quality of the sealing device directly affects the thermal system and operating cost of the rotary kiln.It is beneficial to the management of the equipment to strengthen the collation and analysis of the daily maintenance data of the kaolin rotary kiln.
 

2. Optimization of kaolin rotary kiln

(1) in addition to the final supporting transportation equipment, the cylinder, hot air pipe and standard parts of the kaolin rotary kiln can be shortened, which can significantly reduce equipment investment and installation infrastructure costs, reduce pipelines and reduce system resistance.

(2) some people worry that the air pipe at the end of the kiln of kaolin rotary kiln is inclined, and the horizontal movement is very dangerous, and the flue gas at the end of the kiln of kaolin rotary kiln is too high, causing great damage. However, the application example of kaolin rotary kiln shows that the preheater at the end of the kiln is inclined, so long as the body remains unchanged, the use situation is still good.

(3) due to the special relationship between the length of the kaolin rotary kiln and the diameter of the cylinder, the length and width of the factory area can be shortened moderately, and the input of cables and upper and lower pipelines can be further reduced.

The page source:https://www.cementepc.net/company/Optimized-efficiency-of-kaolin-rotary-kiln.html