Explosion-Proof Fog Cannon Machine – Dust Suppression For Open-Air Coal Sheds

Explosion-Proof Fog Cannon Machine – Dust Suppression For Open-Air Coal Sheds

As an important place for coal storage, the dust generated during coal loading, unloading and stacking in open coal sheds not only pollutes the environment, but also is prone to causing explosion risks when coal dust reaches a certain concentration, becoming a “hidden bomb” for safe production. Ordinary mist cannon machines can reduce dust, but may trigger dangers due to hidden dangers such as circuit sparks. However, the explosion-proof mist cannon machine, relying on its full-link explosion-proof design, while efficiently reducing dust, builds a safety barrier for open coal sheds.​

Explosion-Proof Core: Safety Genes from Inside to Outside​

The safety code of the explosion-proof mist cannon machine lies in every detail. Its key components such as motors and control boxes adopt flameproof design, and the shell can withstand the pressure generated by internal explosion and prevent flame from leaking out; the circuit system is equipped with explosion-proof junction boxes and cable glands to avoid sparks caused by wire friction; even the spray pump has undergone anti-static treatment to eliminate the possibility of explosion caused by static accumulation.​

Compared with ordinary equipment, its dust reduction logic is more suitable for coal shed scenarios: it can monitor dust concentration through infrared sensors. When the coal dust concentration is close to the lower explosion limit (about 50g/m³), it automatically increases the spray intensity to suppress the concentration below 20g/m³; the diameter of fog particles is controlled at 50-150 microns, which can not only efficiently absorb coal dust, but also avoid forming flammable aerosols due to too fine fog particles.​

Case: “Zero Explosion” Transformation of the Coal Shed​

The open coal shed of a large energy enterprise in Shanxi once fell into difficulties due to dust problems. The coal shed covers an area of 20,000 square meters, with an average daily loading and unloading of more than 5,000 tons of coal. In the past, when using ordinary mist cannon machines for dust reduction, motor sparks ignited suspended coal dust, causing a small-scale local explosion. Although no casualties were caused, the shutdown for rectification for 10 days resulted in losses exceeding 10 million yuan.​

Last year, the enterprise replaced 8 explosion-proof mist cannon machines, which were arranged along the four weeks and loading and unloading area tracks of the coal shed. After the equipment was started, a 10-meter-high fog curtain was formed at the coal unloading point, and coal dust was captured by water mist as soon as it was raised; for the floating dust on the surface of the coal stacking area, the mist cannon machine carried out covering spray at a 30-degree elevation angle to form a wet surface to prevent secondary dust emission.​

The data after half a year of operation showed that the dust concentration in the coal shed was stable at 15g/m³, and no explosion hazards occurred again; the PM10 concentration in the surrounding environment decreased by 60% compared with before, meeting the environmental protection emission standards; more importantly, the equipment experienced 3 strong static weather during operation, and no abnormalities were caused due to the anti-static design, completely eliminating safety concerns.​

Multiple Advantages Adapted to Coal Sheds​

The explosion-proof mist cannon machine shows strong practicability in coal shed scenarios: the machine body is made of anti-corrosion steel, which can resist the erosion of sulfur in coal, and the service life is extended to more than 8 years; it supports remote control, and workers can adjust the spray angle and intensity in the central control room, reducing on-site operation time; it is equipped with a large-capacity explosion-proof water tank, and a single water storage can meet 12 hours of continuous operation, adapting to the 24-hour uninterrupted production rhythm of the coal shed.​

In terms of energy consumption, its explosion-proof motor efficiency reaches 92%, which is 15% more energy-efficient than ordinary motors. Combined with the intelligent start-stop function, the annual power consumption can be reduced by about 8,000 kWh. For enterprises with multiple coal shed linkage, cluster control can also be realized through the Internet of Things platform, and spray resources can be dynamically allocated according to the dust situation in each area.​

The core of safety management in open coal sheds is to balance dust reduction efficiency and explosion-proof requirements. The explosion-proof mist cannon machine, with the design concept of “safety first”, deeply integrates dust reduction function with explosion-proof technology, allowing the coal shed to stay away from explosion risks while operating efficiently. When the fog curtain stretches over the coal pile, it not only locks the dust, but also locks the bottom line of the enterprise’s safe production.