How to cool down the cement ball mill?

The method of spraying cooling water is widely used.

1. Avoid gypsum dehydration. Most of the energy consumed by grinding is converted into heat energy, which increases the temperature of air and materials, and the high temperature in the grinding will lead to more gypsum removal for the cement ball mill, which will have an adverse impact on the setting time and strength of cement. Water cooling avoids this phenomenon.

2. In the grinding process, the surface of the cement particles forms an air film due to the adsorption of this part of the air, which hinders the electrostatic action between the particles and avoids the adsorption and coalescence between the particles. However, when the temperature exceeds 100, the air film adsorbed on the surface of the particles is destroyed, and adsorption coalescence is formed between the particles and the particles and between the particles and the lining plate of the grinding body under the action of electrostatics, which plays a buffering role on the grinding and reduces the grinding efficiency. This effect increases with the increase of the specific surface area of the product and the increase of the temperature in the mill.

Therefore, water cooling can improve the grinding efficiency.

3. Because the grinding temperature of the material when grinding cement is generally greater than the grinding temperature of the celery material when grinding the raw material, and the fineness of the product is also finer, the temperature in the grinding is higher. If it is not cooled, the temperature of the cylinder is too high, on the one hand, it will cause the lining gap to become smaller due to thermal expansion, and in serious cases, the lining plate will crowd the convex pina and pull off the screw of the first liner, on the other hand, the temperature of the cylinder will also be transmitted to the hollow shaft, causing the temperature of the hollow shaft to be too high and cause equipment accidents. As a result, water cooling will improve safe operation.

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Advanced grinding technology is used to search for landslide equipment to achieve energy saving.

China's domestic vertical mill and roller press have the advantages of high output and small energy consumption (electricity consumption and metal consumption) for cracking, and are more methods used in grinding systems such as raw meal, cement and slag. Compared with the ordinary ball mill system, the vertical mill and roller press can generally increase the output by 80% l20% and save about 30% of electricity. If Shiyuan considers the one-time investment of the enterprise, the existing open-flow ball mill system can be transformed into a high-fine and high-yield mill with screening function (only for the transformation of the grinding body of the internal mechanism of the mill), and the increase in production and power saving can generally reach about 30%.

In addition, by taking advantage of the characteristics of high yield and high fineness of ground cement, it can also achieve the purpose of energy saving by mixing 5% and 10% of mixed materials. For the closed-circuit system, the equipment can be updated according to its supporting situation, such as replacing the original centrifugal separator with a high-efficiency separator or high-efficiency combined separator with more advanced structural principles, and the increase in production and power saving can also reach more than 30%.

Reduce production costs by increasing the utilization rate of waste residue.

Slag, steel slag, fly ash and other waste slags, after grinding to a specific surface area of more than 400m2 kg 600m2 kg, can increase the content of the mixture to more than 30%, with the preparation of raw material with carbide slag, the maximum content can reach 60%; In addition, the production of cement with garbage calcination raw meal does not belong to the category of grinding, but it is the direction of energy saving in cement production, and the full use of waste calcination technology has been successfully ignited in some cement plant test lines, which can make all the garbage and ash slag be utilized, not only low pollution emissions, which is conducive to grinding, but also can reduce the production cost of traditional high-resource fuels by at least 30% and 40%.

Although the ball mill cement cooler equipment has excellent cooling effect, it also has the following defects:

1. The investment is large, the space required is large, and the amount of cooling water is large.

2. The spiral lift cooler also strictly requires that there is no particle mixing in the cooled cement, otherwise the spiral will not work.

3. The cement cooler can only cool the cement after grinding, which has no effect on reducing the internal temperature of the cement mill, avoiding gypsum dehydration, preventing ball and forging, improving the output of cement mill, and avoiding the temperature of the mill bearing exceeding the standard.

4. Due to the wear and tear of cement on cooling equipment, there are potential safety hazards such as water leakage;

5. Because the gap between the spiral lift cooler cylinder and the spiral blades is very small, and the rotor on which the spiral blades are installed is rotating, the concentricity and coaxiality of the two are very demanding. In particular, the welding process of large-diameter cylinders is more difficult, and if you are not careful, welding deformation and transportation deformation will occur, so it is very difficult to make a large scale.

6. After the cement cooler is used for a long time, due to the impure cooling water or high calcium content, the outer surface of the cylinder in contact with the water flow will accumulate scale and rust. Due to the condensation of moisture in the air on the inner wall, a cement wrapping layer will be formed on the inner surface of the cylinder in contact with the cement, and the occurrence of the above phenomenon will lead to a significant decrease in cooling efficiency.