Flame-free explosion vent valve for indoor dust duct flame arresters

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 the 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.

Indoor Dust Pipeline Flame Arrester Flameless Explosion Vent ValveBrief Introduction:

1. It consists of two parts: an explosion vent panel and a flame extinguishing 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 efficiently, reducing environmental pollution;

4. Combined use with an isolation valve not only prevents pressure waves and flames from propagating to upstream workshop production areas but also suppresses secondary explosions, reducing property damage and ensuring personnel safety.

Product Parameters:

Static opening 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: Depending on the working conditions, it can be divided into rectangular flameless explosion venting devices and curved flameless explosion 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.

Indoor Dust Pipeline Flame Arrester Flameless Explosion Vent ValveWorking Principle:

The flameless venting device consists of two parts—an explosion vent panel and a flame extinguishing module. The explosion vent panel responds to the rapid increase in deflagration pressure, immediately opening to reduce pressure. When the expanding fireball passes through the open vent panel, it is intercepted by the flame extinguishing module. The stainless steel precision 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 flame 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 flame, rapidly cooling the high-temperature flame, 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 grinding, and buildings.

With increasingly stringent environmental inspections, safety is gaining more attention. In the past, explosion vent 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 because it endangers surrounding personnel and equipment. The pressure waves and flames from an explosion could trigger secondary or multiple explosions, posing risks. Therefore, relying solely on explosion vent panels for dust collectors is unreliable. We recommend using flameless venting + isolation technology (a more economical 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: Blocks explosions using an isolation valve to prevent flame propagation.

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