Flame-free explosion venting device for metal processing plants

A flameless venting device is a safety apparatus designed to protect equipment and personnel by automatically shutting down equipment or pipelines during explosions or fires, preventing the spread of flames or escalation of explosions. Its operational principle involves monitoring changes in gas pressure and temperature within pipelines or equipment to detect potential explosion or fire hazards. Upon confirming a risk, it immediately closes the equipment or pipeline while releasing pressure to safeguard both machinery and personnel.

Brief Introduction of Flameless Venting Device for Metal Processing Plants:

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

2. Suitable for flameless venting of dust explosions in indoor equipment, offering high venting efficiency, cost-effectiveness, and practicality;

3. Effectively blocks flames and heat, providing a safe environment for equipment, buildings, and personnel, while also collecting dust to reduce 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, reducing property damage and ensuring personnel safety.

Product Parameters:

Static opening pressure: 0.01MPa;

Frame material: Carbon steel or stainless steel;

Flame-retardant material: 304SS;

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

Product classification: Based on operational conditions, it can be divided into rectangular flameless venting devices and curved flameless venting devices;

Applicable 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.

Working Principle of Flameless Venting Device for Metal Processing Plants:

The flameless venting device comprises two components—an explosion-proof panel and a fire extinguishing module. The explosion-proof panel responds rapidly to rising deflagration pressure, opening immediately to reduce pressure. As the expanding fireball passes through the open panel, it is intercepted by the extinguishing module. The stainless steel precision mesh, supported by a frame, acts as a three-dimensional flame trap, extinguishing flames to prevent propagation and avoid secondary or multiple explosions. The extinguishing module eliminates deflagration flames, reduces the temperature of hot gases, and captures both burning and unburned dust passing through the open panel.

Simultaneously, pressure waves or noise generated by production equipment are minimized. When flames pass through the mesh flame-retardant element, heat exchange occurs, rapidly cooling high-temperature flames, releasing pressure and smoke, while also reducing pressure waves or noise from production equipment.

Application Fields:

Widely used in industries such as grain, 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. Traditionally, venting panels were 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 surrounding personnel and equipment. Pressure waves and flames from explosions may trigger secondary or multiple explosions, posing risks. Therefore, relying solely on explosion-proof panels for dust collectors is unreliable. We recommend using flameless venting + isolation technology (a cost-effective solution) or 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 isolation valve to block explosions and prevent flame propagation.

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