[Firefighting Technology] Infrared Thermal Imaging Technology Realizes Intelligent Monitoring of Dangerous Goods Warehouses

I. Background Overview

Hazardous chemicals storage refers to a kind of stay in the circulation process before the dangerous chemicals leave the production field and have not yet entered the consumption field. For flammable, explosive, corrosive, poisonous, dangerous chemical raw materials and dangerous goods storage sites such as chemical fertilizers, pesticides, chemical reagents, etc., if there is a fire and explosion, the damage will be very serious, which may lead to group deaths and other serious injuries. The consequences of its heavy casualties, large economic losses, and large political influence have become one of the most important targets for the security of the fire department and the entire society today.

Enschede, the Netherlands within the scope of the city's one hazardous chemicals warehouse fire, the fire detonated stored there more than 100 tons of fireworks, explosion radius around the warehouse more than 500 m 2000: at 3:13 on May pm Was razed to the ground. The explosion also affected the nearby houses, killing 20 people and injuring more than 600 people. The fire explosion destroyed more than 400 houses and left more than 2,000 people homeless.

Around at 23:30 on August 2015 on the 12th, the company Tianjin Port RUIHAI dangerous goods warehouse fire explosion occurred, killing 165 people were killed, 8 missing, 798 people were ,, 304 buildings, 12,428 goods vehicles, and 7533 Damaged containers.

II. Analysis of Causes of Storage of Hazardous Chemicals

1. Lax control of ignition source: The ignition source refers to all the thermal energy sources of burning combustibles, including bright flames, sparks, sparks, and chemical energy.

2. Miscellaneous conflicting items: Due to the lack of knowledge of the handlers or the lack of identification of some hazardous chemicals at the time of shipment, some companies may temporarily mix together due to the lack of storage space, resulting in the infiltration of hazardous chemicals due to container leakage. Leakage and other chemical reactions occur and cause a fire.

3. Deterioration of products: Some dangerous chemicals have not been used for a long time and are still disposed of in warehouses. They are not dealt with in time and often cause fire due to deterioration.

Other reasons include poor maintenance and management, damaged or unqualified packaging, violation of operating procedures, failure of buildings to meet storage requirements, lightning strikes, and improper fire fighting.

Third, what are the current solutions

1. The main solution for dangerous goods warehouses is to install temperature detectors and smoke detectors. but:

The temperature detector can only monitor the temperature of the equipment installation point, and lack of practicality for the overall monitoring of the entire large space warehouse;

The smoke detector needs to have an alarm in case of smoke, which is an after-thought alarm and has little effect on the monitoring of the temperature of the warehouse.

2. Video surveillance: Install a video surveillance device and view the warehouse through visible light monitoring. However, due to the inability to monitor the temperature situation, it is a post-event monitoring and cannot play a role in prevention and monitoring. Night monitoring is dependent on supplemental light to expose the location of surveillance equipment, and concealment is poor.

IV. Infrared thermal imaging technology helps fire prevention of dangerous chemicals warehouses

Infrared radiation is one of the most widespread electromagnetic wave radiations in nature. The temperature image is realized by the thermal imager and is visible to the human eye. At the same time, the atmosphere, smoke clouds, etc. do not absorb 3-5 micron and 8-14 micron infrared rays. Therefore, these two bands serve as an “atmospheric window”, and we can be in a completely dark night or in the harsh environment of smoke clouds. In the middle, the situation in the monitoring area was clearly observed. Due to this feature, infrared thermal imaging technology can be used in security night surveillance and fire monitoring systems in various locations. According to "Building Design Fire Code GB50016 ", "Inflammable and Explosive Preservation Technical Conditions for Preservation, GB17914-1999 " , "Corrosive Commodity Storage and Maintenance Technical Conditions, GB17915-1999 ", and "Warehouse Fire Safety Management Rules" and According to the actual situation of dangerous goods warehouse fire prevention, infrared thermal image technology has the following help for the application of hazardous chemicals warehouses:

  1 , fire alarm

Since the infrared thermal imager is an imaging device that reflects the surface temperature of an object, it can be used as an on-site monitor in addition to nighttime. It can also be used as an effective fire alarming device. In the early stages of all firefighting hazards, the disaster is often caused by abnormally high temperatures. Obviously caused by hidden fire. With existing common methods, it is difficult to find such hidden fire signs. Infrared thermography technology can quickly and effectively find these hidden fires, and can accurately determine the location and scope of the fire, through the smoke found that the fire point, so that as early as possible early prevention and early extinguishing.

2. Target monitoring at night and in adverse weather conditions

At night, devices that require visible light are no longer working. If low-light night vision equipment is used, it also acts in the visible light band and still requires external light illumination. The infrared thermal imager passively accepts infrared heat radiation of the target itself, and can work normally during the day and night. In the same harsh weather conditions such as rain and fog, due to the short wavelength of visible light, the ability to overcome obstacles is poor, so the observation effect difference, but the longer infrared wavelengths, especially in the 8-14 μ m of working thermal imaging device, the penetration of rain, fog ability, so harsh climatic conditions and at night using an infrared thermal imaging device can still monitor normally Various targets are monitored.

3 , fire rescue

Because in the dangerous chemicals warehouse industrial area, it is easy to cause fire, and when the fire occurs, how to save lives becomes a very tricky thing. Because of the smoke scene, firefighters cannot effectively and accurately find trapped people. When the time is delayed, the lives of the trapped are even more dangerous. Infrared thermal imaging technology's smoke penetration and fogging function can play a key role in firefighting:

Personnel Search and Rescue - Smoke-filled fires are in search of sieges.

With strong smoke penetration performance, it can quickly find the target under the dense smoke environment in the fire, and find the escape exit;

Improve the safety of firefighters, and apply to search and rescue operations in various fire environment;

Detection of dangerous goods - to obtain the temperature changes of dangerous goods in the fire field, can provide a reference for fire fighting work;

Fire site cleaning - the detection of hidden sources of ignition that existed after the fire was extinguished.

The information in this article comes from the Internet and was reorganized and edited by China Rescue Equipment Network.