A flameless explosion venting device is a safety apparatus used to protect equipment and personnel. It automatically shuts down equipment or pipelines in the event of an explosion or fire, preventing the spread of flames or the escalation of an explosion. Its working principle involves detecting changes in gas pressure and temperature inside pipelines or equipment to determine whether there is a risk of explosion or fire. If a hazard is confirmed, it immediately shuts down the equipment or pipeline while releasing pressure to achieve the goal of protecting both equipment and personnel.

Brief Introduction to Flameless Pressure Relief Devices for Dust Explosion Vents:

1. It consists of two parts: an explosion vent panel and a flame quenching module;

2. Suitable for flameless venting of dust explosions in indoor equipment. It offers high venting efficiency and is cost-effective;

3. Effectively blocks flames and heat, providing a safe environment for equipment, buildings, and personnel. It also collects dust effectively, reducing environmental pollution;

4. When used in combination with explosion isolation valves, it not only prevents pressure waves and flames from propagating to upstream production areas but also suppresses secondary explosions, reducing property damage and ensuring personnel safety.

Product Parameters:

Static activation pressure: 0.01 MPa;

Frame material: Carbon steel or stainless steel;

Flame arrestor material: 304 SS;

Applicable dust: St1 and St2 dust with Kst ≤ 300 barg*m/s, with effective venting area meeting explosion venting requirements;

Product classification: Depending on the application, it can be divided into rectangular flameless venting devices and curved flameless venting devices;

Applicable equipment: Dust collectors, bucket elevators, drying equipment, cyclones, dust collectors;

Industries: Wood processing, plastics, spray painting, food and dairy, plastic and dye processing, grain storage and processing, pharmaceuticals, coal processing, brewing, chemicals, metal processing, chemicals, power, cement, and other industries.

Working Principle of Flameless Pressure Relief Devices for Dust Explosion Vents:

The flameless venting device consists of two parts—an explosion vent panel and a fire extinguishing module. The explosion vent panel responds to the rapid increase in deflagration pressure, opening immediately to reduce pressure. When the expanding fireball passes through the open vent panel, it is intercepted by the fire extinguishing module. The precision stainless steel mesh, supported by a frame, acts as a three-dimensional flame trap, extinguishing the flame and preventing its propagation, thereby avoiding secondary or multiple explosions. The fire extinguishing module eliminates deflagration flames, reduces the temperature of hot gases, and captures both burning and unburned dust passing through the open vent panel.

At the same time, pressure waves or noise generated by production equipment are significantly reduced. As flames pass through the mesh flame arrestor element, heat exchange occurs between the element and the flames, rapidly cooling the high-temperature flames, releasing pressure and smoke. Additionally, pressure waves or noise from production equipment are minimized.

Application Areas:

Widely used in industries such as grain, metallurgy, chemicals, power, light industry, tobacco, pharmaceuticals, machining, and solid waste treatment. Applicable equipment includes cyclones, bag dust collectors, dust collectors, cartridge filters, pneumatic conveying systems, rod or ball mills, bucket elevators, dryers and ovens, roller mills, and buildings.

With increasingly stringent environmental inspections, safety has become a major concern. In the past, explosion vent panels were commonly installed on dust collectors to release overpressure caused by dust explosions. However, installing such devices on indoor equipment is not permitted by safety regulations because it poses risks to surrounding personnel and equipment. The pressure waves and flames from an explosion could trigger secondary or multiple explosions, creating hazards. Therefore, relying solely on explosion vent panels for dust collectors is not reliable. We recommend using flameless venting + isolation technology (a more economical solution) or explosion suppression + isolation technology to ensure production safety.

There are three main methods for dust explosion protection: venting, isolation, and suppression.

Venting: Releases explosion pressure in advance through a pressure relief device to protect equipment from damage.

Isolation: Uses an explosion isolation valve to block the explosion and prevent flame propagation.

Suppression: Detection devices identify sparks and trigger fire extinguishing systems to instantly suppress flames, preventing explosions.