What is the general pressure difference of raw meal vertical mill, and what should be the appropriat

The question of what is the pressure difference of the raw meal vertical mill is generally calculated by the formula, wind speed * area = air volume and wind pressure, and the pressure difference actually refers to the same thing, full pressure = dynamic pressure + static pressure, generally speaking, the pressure difference of the raw meal vertical mill may change due to operation when working, and the main reasons for the change of pressure difference are as follows:

1) The feeding volume is large, and the grinding capacity is not enough.

Treatment: According to the power of the raw meal vertical mill, the production will be appropriately reduced.

2) The product is too fine, and the internal circulation load value is high.

Treatment: Reduce the speed of the separator.

3) The separator of the raw meal vertical mill may be clogged.

Treatment: Stop grinding for inspection.

4) The guide angle of the separator is too narrow or the length is too long, which restricts the material from passing through the outlet smoothly.

5) The retaining ring is too high, resulting in high internal circulating load.

Treatment: Raw meal vertical mill stop grinding adjustment.

6) The scraper is broken or dropped, and no recycled material is formed. The material baffle is broken or off, forming a large amount of recycled material.

Treatment: Stop grinding for maintenance.

7) The air flow in the mill is small, which affects the material to pass through the separator.

Treatment: The fan of the raw meal vertical mill increases the exhaust volume and adjusts the inlet damper of the fan.

8) The grinding pressure pipe is blocked, and the grinding pressure (negative pressure value) returns to become smaller, resulting in a high differential pressure display value in the mill.

Processing: Notify the instrumentation worker to process.

9) The air temperature and wind speed are too high and the wind speed is too fast, and the material cannot form a material layer on the grinding disc and is suspended in the mill, resulting in a high pressure difference in the raw meal vertical mill.

Treatment: Adjust the temperature of the humidification tower or adjust the external air (or circulating air) to reduce the temperature of the grinding air and slow down the wind speed.

10) The operation of the external wind is used too much or the side door of the return material (zipper machine) is opened, resulting in a decrease in the grinding pressure, slowing down the internal circulation of the grinding system, increasing the return material of the external circulation, enriching it, and causing the internal differential pressure of the raw meal vertical mill to become high.

Treatment: During the operation, adjust the internal circulation of the grinding system, increase the return material of the external circulation, close the doors, and prevent the occurrence of air leakage.

11) The abrasiveness of the material is very poor, and the material is difficult to grind, resulting in a high pressure difference in the grind.

Treatment: Reduced production operation or appropriate increase in pressure or on-site inspection of the pressure tank.

12) The long-term operation of the raw meal vertical mill increases the content of quartz crystals in the mill, resulting in the material being difficult to grind and the differential pressure rising.

Treatment: Reducing production or discharging this part of the material out of the mill.

Resources.

Start by looking for industry standards and specifications. If you know what type of mill it is, you can check the relevant manufacturing standards and design standards.

Wind speed * area = air volume.

Wind pressure and pressure difference actually refer to the same thing, there is a calculation formula between the total pressure = dynamic pressure + static pressure difference and wind speed, the relationship between the root number.

The raw meal vertical mill ( was described above

The differential pressure is calculated, and then describes the reasons for the change in the differential pressure in production, and how we can solve these problems.

(1) The fineness of the raw meal mainly depends on the burnability of the raw materials, the technological process, the kiln type of the rotary kiln, the firing temperature and the cement variety. If the ratio of crystalline quartz, flint to crystalline calcite in the raw material.

more, grinding finer; If you use chalk and marl ingredients, you can grind it coarsely; The firing temperature is high, and it can be ground coarsely; rotary kiln calcination can be coarse; Due to the uneven temperature of the vertical kiln, it should be ground finer; The production is fast and hard.

High-strength cement should be ground finer; Closed-circuit grinding can be coarser than open-circuit grinding.

2) The fineness of the wet kiln wet baseball mill raw meal is controlled at 13 15, and the sieve residue is controlled at 2 4; Sieving residue of raw meal in a new dry rotary kiln.

Generally controlled at 12 14, sieve residue control is less than; The sieve fineness of some slag batching new dry kiln raw meal can even be relaxed to 20 25. Plain dry.

The sieving residue of the raw meal of the rotary kiln is generally controlled below 12, and the sieving residue is controlled below; The sieving residue of the raw material in the vertical kiln is generally controlled at less than 10, and the sieve is sieve.

More than that, preferably less. For the raw meal milled in a closed-circuit manner, because there are fewer coarse particles, the sieve residue should be the upper limit of the above range or slightly coarse. When the raw material contains crystalline quartz.

The fineness of the raw meal should be finer, and the sieve residue should be strictly controlled, and should not be greater, preferably not greater.

3) The narrower the distribution of raw meal particles (i.e., the more uniform the particle size), the better. When the particle size distribution is too wide, there are more coarse and fine grains. At this time, the coarse particles aggregate, resulting in uneven composition; Fine particles, however, are easily carried away by air currents.

and cause losses. Therefore, closed-circuit grinding is superior to open-circuit grinding for raw meal.

4) The fineness of the raw meal, the material particles are small, the composition is more uniform, the calcination reaction is fast and complete, which is conducive to the improvement of clinker production and quality. But if the grinding is too fine, the output of the mill decreases significantly, and the powder.

The grinding power consumption has increased significantly, and the amount of fly ash generated during the firing process has increased. However, the improvement of firing speed and quality by overfine raw meal is limited. Therefore, from the perspective of comprehensive effect, the raw meal does not have to be milled.

It is too fine, as long as it can better meet the requirements of firing.

The above is a brief introduction to the fineness of the raw meal controlled by Shanchuan Heavy Industry, Zhengzhou Shanchuan Heavy Industry specializes in the production of magnetic separation, flotation, mechanical separation, gravity separation, chemical separation, and roasting of minerals.

A full set of mineral processing equipment, including feeder, crusher, ball mill, magnetic separator, flotation machine, mixing drum, dryer, rotary kiln, rod grinding sand making machine, belt conveyor, sand making machine, sand washing machine, spiral classifier, screening equipment, shaker, spiral chute, physical gold separator, vacuum filter, gold chute, pelletizing disc (granulator), inclined pipe thickening box and a series of mineral processing equipment. And for.

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The general height is that the function of the retaining ring is to make the material fully ground on the hail grinding disc. The height of the retaining ring determines the thickness of the material layer. When the thickness of the material layer is high, the vibration of the mill will increase, and the coarse powder will not be fully ground under the action of the centrifugal force of the ant, and enter the external circulation, so that the total amount of grinding will increase, reduce the output of the stage, and the vibration of the mill will be large.

When the retaining ring is too low, it is difficult to ensure a stable thickness of the material layer, and under the action of tensioning force and the weight of the grinding roller itself, there will be a chance of intermittent direct contact and impact of the roller disc, causing vibration and normal production. Therefore, with the continuous wear of the roller disc, we continuously reduce the height of the retaining ring according to the production situation until the retaining ring is completely removed. This is just my personal opinion, if you want to know more about the boring and more detailed can go to the official website of Great Wall Machinery to see, they are specialized in the production of vertical mills I hope my answer will be helpful to you, Finally, I wish you good health and a happy mood!