As core facilities for coal storage, large-scale coal sheds—with spaces often spanning tens of thousands of square meters and coal piles as high as over ten meters—pose significant challenges for dust suppression. Traditional explosion-proof fog cannons typically have a range of less than 50 meters; when used in extra-large coal sheds, dense equipment deployment is required to achieve full coverage, which not only increases costs but also easily leaves dust suppression blind spots. On the other hand, ordinary long-range fog cannons lack explosion-proof designs, making them unable to address the explosion risks posed by suspended coal dust in coal sheds. The emergence of the 100-meter explosion-proof fog cannon, with its dual advantages of “ultra-long range + full-link explosion protection,” has completely solved the dust suppression dilemma in large-scale coal sheds.
The range breakthrough of the 100-meter explosion-proof fog cannon stems from its upgraded high-pressure atomization system—it adopts a three-stage booster pump and is paired with a streamlined barrel design, enabling it to accurately deliver water mist to the top of coal piles 100 meters away. Moreover, the mist particles maintain an optimal adsorption size of 50-150 microns throughout the process, which is not easy to disperse even in the high space of coal sheds. Targeting the “multi-point coal piling and dynamic dust emission” characteristics of large coal sheds, the equipment supports 360-degree rotating spraying; a single unit can cover an area of approximately 30,000 square meters, reducing equipment deployment by 60% compared to traditional 50-meter models.
More critically, its explosion-proof performance has been fully enhanced: core components such as motors and electrical control boxes adopt Ex d IIB T4 Ga-level flameproof design, which can withstand the explosion pressure of coal dust that may occur in coal sheds; the circuit system is equipped with dual anti-static grounding devices to prevent static sparks from igniting coal dust; even the water mist delivery pipelines use explosion-proof sealing technology to eliminate safety hazards caused by pipeline friction. At the same time, the equipment is equipped with a coal dust concentration monitor that can track the coal dust content in the air in real time. When the concentration approaches the lower explosion limit (50g/m³), it automatically increases the spray intensity to ensure the concentration remains below the safety threshold.
A large coal shed of an energy group in Inner Mongolia covers an area of 120,000 square meters, with coal piles as high as 18 meters. In the past, 8 units of 50-meter explosion-proof fog cannons were used for dust suppression. However, due to insufficient range, there were always dust suppression blind spots in the center and top of the coal shed, and the coal dust concentration often exceeded 80g/m³. In winter, frequent pipeline freezing and cracking failures occurred due to dense equipment deployment.
Last year, the group upgraded its equipment to 4 units of 100-meter explosion-proof fog cannons, arranged symmetrically along both sides of the coal shed. After the equipment was activated, the water mist with a 100-meter range could cross the center of the coal shed and reach the top of the opposite coal pile, forming a mist curtain that achieves “full horizontal coverage and vertical coverage from top to bottom.” For dynamic dust generated by forklift operations, the fog cannon can adjust the elevation angle through remote control, flexibly switching from 10 degrees to 80 degrees to track dust emission points in real time.
Data after six months of operation showed that the coal dust concentration in the coal shed stabilized at 15g/m³, a decrease of 81% compared to before; due to the reduced number of equipment, pipeline maintenance costs decreased by 45%, and winter freezing and cracking failures dropped from 3 times per month to zero; more importantly, during 3 abnormal fluctuations in coal dust concentration, the equipment promptly controlled risks through automatic pressure-boosted spraying, with no safety accidents occurring. Data from surrounding environmental monitoring also showed that the PM10 concentration outside the coal shed decreased by 72%, completely resolving the resident complaints caused by dust overflow in the past.
To meet the operational needs of large-scale coal sheds, the 100-meter explosion-proof fog cannon has also undergone a number of targeted designs: the machine body is made of low-temperature-resistant steel, which can start normally in harsh cold environments of -30℃, making it suitable for winter operations in northern coal sheds; it is equipped with a 2,000-liter large-capacity explosion-proof water tank, and combined with an automatic water replenishment system, a single water filling can meet 8 hours of continuous operation without frequent shutdowns for water refilling; it supports IoT cluster control, allowing staff in the central control room to check the operating status and dust concentration data of each device, realizing efficient “one-person management of multiple machines.”
For the common “dust + moisture” dual corrosion problem in coal sheds, the equipment surface is coated with a Teflon anti-corrosion coating, which can resist long-term erosion from coal leachate and water mist. Its service life is extended to 10 years, an increase of 50% compared to traditional models. In addition, its spray volume can be adjusted between 100-500L/min—it can increase the mist volume during peak coal loading and unloading periods, and reduce spraying during the static storage period to avoid excessive moisture in coal piles affecting combustion efficiency.
Dust suppression in large-scale coal sheds must not only solve the range problem of “reaching every corner” but also hold the safety bottom line of “preventing risks.” The 100-meter explosion-proof fog cannon covers the entire area with its ultra-long range and builds a solid safety defense line with its strict explosion-proof design, allowing large-scale coal sheds to bid farewell to the dilemma of “dust-filled space.” When the 100-meter-long mist curtain unfolds over the coal shed, it not only traps every particle of coal dust but also safeguards the safe production and ecological responsibilities of energy enterprises, becoming a benchmark choice for dust suppression in large-scale coal sheds.
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