A coal bunker in China domestic thermal power plant, as the energy storage area of the entire power plant, the storage capacity of the coal bunker is of great significance to the entire production. The coal bunkers consist of lump coal bunkers, raw coal bunkers, and powder coal bunkers. It is needed to grasp the material storage capacity of each coal bunker for comprehensive coal management. Long term manual inspection has the disadvantages of poor efficiency and data unifying, which is not conducive to the allocation of resources by process managers. Therefore, it was decided to carry out automated transformation of coal bunker management.

1.The diameter of the coal bunker is relatively large between 20 and 40m. How to realize the storage conversion of the coal bunker through monitoring the material level?

2.The dust in the powder coal bunker is relatively large, then how to avoid the impact of dust on measurements?

3.How can the collected data be synchronized to the power plant's management platform to achieve visual management on the premise of realizing the control function?

After an actual on-site visit to the customer, the customer currently has three lump coal bunkers: 25 meters in diameter and 40 meters in height; one raw coal bunker: 30 meters in diameter and 45 meters in height; two powder coal bunkers: 25 meters in diameter and 40 meters in height; Considering that the actual material level is tapered structure, and to realize the accurate transformation from material level to storage capacity (volume), two radar level meters are installed on both sides of the top of the coal bunker for material level monitoring. The background PLC collects material level information for average calculation, and obtains accurate coal reserves through height and volume conversion.

In view of the special working conditions of large dust in pulverized coal bunker, the material level measurement adopts 80G FM radar, equipped with universal flange and air source purge function. The wavelength of 80G radar is short, the beam angle is small, and it’s strong enough to penetrate; 80G FM radar level meter can prevent powder from measuring and provide real and reliable data for measurement.

The collected data is connected to the power plant's VPN virtual private network through the PLC's wireless 4G routing to achieve remote visual monitoring of data.