Flame-free explosion venting device for dust collectors in chemical plants

A flame-free 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, the device immediately shuts down the equipment or pipeline while releasing pressure to achieve the goal of protecting both equipment and personnel.

Brief Introduction to Flame-Free Explosion Venting Devices for Dust Collectors in Chemical Plants:

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. High venting efficiency, economical and practical;

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

4. Combined use with explosion isolation valves not only effectively prevents pressure waves and flames from propagating to upstream workshop production areas but also suppresses secondary explosion accidents, 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, effective venting area meets explosion venting requirements;

Product classification: Depending on the working conditions, it can be divided into rectangular flame-free venting devices and curved flame-free venting devices;

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

Application industries: Wood processing, plastics, spraying, food and dairy products, plastic and dye processing, grain storage and processing, pharmaceuticals, coal processing, brewing, chemicals, metal processing, chemicals, power, cement, and other industries.

Working Principle of Flame-Free Explosion Venting Devices for Dust Collectors in Chemical Plants:

The flame-free venting device consists of two parts—an explosion venting panel and a flame extinguishing module. The explosion venting panel responds to the rapid increase in deflagration pressure, immediately opening to reduce pressure. When the expanding fireball passes through the open venting 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 ensuring it does not propagate, thereby preventing secondary or multiple explosions. The flame extinguishing module eliminates deflagration flames, reduces the temperature of hot gases, and captures burning and unburned dust passing through the open venting panel.

At the same time, pressure waves or noise generated by production equipment are also reduced to a minimal level. When 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 generated by production equipment are reduced.

Application Fields:

Widely used in industries such as grain, metallurgy, chemicals, power, light industry, tobacco, pharmaceuticals, mechanical processing, 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, buildings, etc.

With increasingly stringent environmental inspections, safety is receiving more attention. In the past, explosion venting panels were commonly installed on dust collectors to release overpressure caused by dust explosions. However, such installations on indoor equipment are not permitted by safety regulations because they endanger surrounding personnel and equipment. The pressure waves and flames from an explosion may cause secondary or multiple explosions, creating risks. Therefore, relying solely on explosion venting panels for dust collectors is unreliable. We recommend using flame-free 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 detect sparks and trigger fire suppression systems to instantly extinguish flames, preventing explosions.