Flame-Free Pressure Relief Safety Device (Flame-Free Explosion Venting Device)

A flame-free explosion venting device is a safety apparatus designed to protect equipment and personnel by automatically shutting down equipment or pipelines in the event of an explosion or fire, thereby preventing the spread of flames or the escalation of an explosion. Its operational principle involves detecting changes in gas pressure and temperature inside pipelines or equipment to assess the risk of an explosion or fire. If a hazard is confirmed, the device immediately shuts down the equipment or pipeline while releasing pressure to safeguard both machinery and personnel.

Flame-Free Pressure Relief Safety Device (Flame-Free Explosion Venting Device)Brief Introduction:

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

2. Suitable for indoor equipment dust explosion flame-free venting. 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 efficiently, reducing environmental pollution;

4. When combined with an isolation valve, it not only prevents pressure waves and flames from propagating to upstream production areas but also mitigates secondary explosions, minimizing property damage and ensuring personnel safety.

Product Parameters:

Static activation pressure: 0.01 MPa;

Frame material: Carbon steel or stainless steel;

Flame arrestor material: 304SS;

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

Product classification: Based on application conditions, it can be divided into rectangular flame-free explosion venting devices and curved flame-free explosion venting devices;

Suitable equipment: Dust collectors, bucket elevators, drying equipment, cyclone separators, 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 more.

Flame-Free Pressure Relief Safety Device (Flame-Free Explosion Venting Device)Working Principle:

The flame-free venting device consists of two parts—an explosion-proof panel and a fire extinguishing module. The explosion-proof panel responds rapidly to the surge in deflagration pressure, opening immediately to reduce pressure. As the expanding fireball passes through the open explosion-proof 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 particles passing through the open explosion-proof panel.

Simultaneously, pressure waves or noise generated by production equipment are significantly reduced. As flames pass through the mesh flame arrestor, heat exchange occurs between the arrestor and the flames, rapidly cooling the high-temperature flames, venting pressure and smoke, while also diminishing pressure waves or noise from the production equipment.

Application Fields:

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

With increasingly stringent environmental inspections, safety has become a major concern. In the past, explosion venting panels were commonly installed on dust collectors to release overpressure caused by dust explosions. However, installing such devices indoors is not permitted by safety regulations, as it endangers nearby personnel and equipment. The pressure waves and flames from an explosion could trigger secondary or multiple explosions, posing significant risks. Therefore, relying solely on explosion-proof panels for dust collectors is unreliable. We recommend using flame-free explosion venting + isolation technology (a more economical solution) or suppression + isolation technology to ensure production safety.

There are three primary 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 isolation valve to block the explosion and prevent flame propagation.

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