I. Background and significance

The silo can prevent rain, snow and sand because it occupies a small area of its land, which is a good solution to the problem of dust pollution in the process of usual high wind and secondary dust in the process of coal pile taking, and ensures the stability of stored coal composition and humidity, effectively reduces the loss of coal, realizes the fully enclosed storage of coal storage yard, with high environmental performance, and also shortens the material loading and unloading process and reduces operation and maintenance costs. Therefore, in recent years, round silo has become a measure for coal storage in power plants and coal mines.

Long-term contact between coal and air will lead to oxidation reaction and release heat. Although the heat in the outer layer of the coal pile can be distributed, due to the slow air flow and poor ventilation inside the coal pile, resulting in the accumulation of internal heat, the temperature inside the coal pile becomes higher and higher, and when the temperature exceeds the spontaneous combustion point of coal, spontaneous combustion will occur. At the same time, along with the spontaneous combustion of coal, toxic and harmful gases such as carbon monoxide and methane will be produced, so it is important to monitor the temperature of the coal pile in real time and effectively.

II. Solutions

The silo safety monitoring system should have temperature, combustible and toxic gas (including CH4 and CO), flue gas dust concentration detection, material level detection and radar level meter output relevant data and alarm information. The silo safety monitoring system can perfectly solve all the drawbacks of the original silo safety, which not only integrates many existing products and technologies of our company as a whole, but also can do linkage control with other systems, and has many implementation cases, which can perfectly solve and smoothly run no matter how to use the environment, and realize the digital transformation and upgrade of coal yard safety.

The silo safety monitoring system includes a series of necessary testing equipment and testing means for silo facility safety, silo area personnel safety and silo equipment safety to ensure high reliability and safety of silo operation.

The silo safety monitoring system is composed of on-site detection equipment, monitoring system and interlocking control equipment. Each silo site is equipped with detection equipment and detection instruments such as silo storage coal temperature detection and combustible and toxic gas (CO and CH4, etc.) detector inside the silo. The silo safety monitoring system can operate independently, and the silo safety system equipment can also be connected with other systems in a reliable, convenient and safe way.

Silo safety monitoring system should have temperature, combustible and toxic gases (including CH4 and CO), flue gas dust concentration detection, material level detection with radar level meter output relevant data and alarm information. Output data to correctly guide the start-up and shutdown of the ventilation replacement system.

III. Main function implementation

1.Combustible gas CH4 detector, toxic gas CO and other gas detectors, smoke sensors, dust concentration detectors and other detectors to analyze the detected concentration and determine whether the alarm exceeds the limit.

2.The temperature measurement cable monitors the temperature of the silo can coal seam in real time, and analyzes and judges whether the temperature exceeds the limit alarm.

3.Flame detectors detect open flames and activate fire pump equipment for fire suppression operations.

4.The radar level can monitor the coal storage height in the silo, and the coal storage volume of the silo can be grasped in real time, and the high or low level can be alarmed and prompted.

5.The high level meter can store coal with confidence during the storage process, and when it reaches the specified height, it carries out alarm and belt machine linkage to stop the coal storage.

6.The main control cabinet uses a large screen to display various data, and the site can be operated by touch.

7.Linkage with other systems for early warning and start/stop of ventilation replacement systems.