Since the air slide conveyor has no moving parts in the process of conveying materials, it has the advantages of less wear, easy maintenance, less power consumption, and less material consumption compared with belt conveyors, screw conveyors, and scraper conveyors of the same power. It has the advantages of no noise, good airtightness, simple structure, safe and reliable operation, easy to-change direction, and multi-point feeding and unloading. Therefore, it has been widely adopted by many enterprises.

However, due to improper design and use during use, it is very easy to cause material blockage. The cause of the air slide conveyor blockage is analyzed and dealt with. This problem has been completely solved and the electricity bill is saved. The solution process is summarized as follows. For peer reference.

Energy-saving renovation of the air slide conveyor

Through the analysis, it can be concluded that the air consumption of the air delivery air slide conveyor is related to the width, length, and air consumption per unit area of the air slide conveyor. The air consumption per unit area is usually 1.5-3m³/(m²·min-¹) (equivalent to the reliability coefficient). Through on-site observation, it can also transport materials normally without blocking when taking 1.4m³/(m²·min-¹).

Reduce fan

However, the previous concept believed that the greater the air volume of the fan, the greater the conveying capacity, which led to the company’s air slide conveyor fan selection being too large, and high energy consumption. Some air slide conveyors can meet the requirements with one fan and are actually used. 2 or even 3, 4kW fans can meet the requirements and actually use 7.5kW or even 11kW. Through transformation and replacement, a total of 9 7.5kW fans were removed, 6 4kW fans were replaced, and 1 11kW fan was stopped. The cement grinding process can save 52kW of power consumption, with an annual 45% operation rate, and an annual cost savings of 102,492 yuan. The cement packaging process saves 12kw of electricity consumption, and the annual operation rate is 65%, which can save 34,164 yuan per year, and the total annual electricity cost savings is 136,656 yuan. In order to reduce the cost of renovation, the fans used are all existing dismantled low-power fans. The cost of steel and accessories is 10,000 yuan, and the labor cost is 30,000 yuan. The cost can be recovered in 4 months.

Cause analysis and treatment of material blocking in the air slide conveyor

Raise the feeding angle of the air conveying the air slide conveyor

When the cement production capacity exceeds 300t/h, the material-blocking phenomenon occurs. The measures taken in the early stage are to add a 4kW fan and increase the compressed air at the discharge port, but this does not solve the problem. Because the blocking material can only be used by hammering the air to convey the inclined The measures of the air slide conveyor shell to cause the air slide conveyor shell to sag inward, and the more sag, the easier it is to block the material, thus forming a vicious circle. Later, the slope of the air slide conveyor was increased, the air delivery air slide conveyor of the roller press into the mill was increased from 7° to 11°, and the finished product storage air slide conveyor was increased from 6° to 8°, which completely solved the material blocking caused by the limited conveying capacity. Phenomenon.

Change the conveying route to increase the conveying speed

Air conveying should try to avoid material hedging, high-altitude vertical feeding, and continuous turning because the above unreasonable structure will make the material unable to form an initial velocity and cause material blockage. The solution to the problems with the above structure is as follows:

The finished product air slide conveyor is modified to reduce material hedging, and the original “T type” is changed to “Y type”, see Figure 1.

Energy saving transformation of air slide conveyor
Figure 1

There are many turns in the grinding air slide conveyor, and the initial velocity cannot be formed, resulting in material accumulation and material blockage. Through transformation, 2 turns of the air slide conveyor are reduced, as shown in Figure 2.

Energy saving transformation of air slide conveyor
Figure 2

Coarse powder enters the grinding air slide conveyor to change the vertical 9m feed to 45° oblique feed to reduce material impact, see Figure 3.

Energy saving transformation of air slide conveyor
Figure 3

Final words

The conveying capacity of the air slide conveyor fan is related to the width, slope, and material properties of the air slide conveyor. The excessive air volume of the fan causes increased energy consumption and dust leakage. Through the transformation and optimization of the air slide conveyor fan, the expected effect has been achieved.
The air slide conveyor should minimize or avoid material hedging and continuous turning of the air slide conveyor, and avoid vertical feeding with high drop. Through the structural modification of the air slide conveyor, there has been no material-blocking phenomenon after one year of operation.