At 12:10 on January 7, a canteen collapsed in Fengshan Street, Wulong District, Chongqing. As of press time, 16 people have been killed and 10 injured. How is the on-site rescue progressing? Why did the accident happen suddenly? How to ensure the gas safety "one meter after zui?

It was lunch at the time of the incident, and rescue at the scene was difficult.

At the time of the accident, many people around heard the explosion, and then a large mass of white smoke rose from the scene. Ms. Chen is a clerk at a fast food restaurant on Jianshe West Road, Wulong District. When the incident happened, she heard a loud noise in the store: "At first, I thought it was a construction site shooting. Later, I saw the fire engine and ambulance and realized that something had happened."

After the accident, more than 600 professionals from fire control, public security and armed police quickly went to the rescue. The main person in charge of the Chongqing Municipal Party Committee and the Municipal Government rushed to the scene of the accident to direct the search and rescue work.

Firefighters involved in the rescue told reporters that when they arrived at the scene, they saw that a two-story building where the canteen was located had been razed to the ground, with bricks, prefabricated panels, and beams scattered all over the ground. "The collapsed houses are made of sand bricks, which are relatively old and have relatively weak overall strength."

The reporter learned that the collapsed house was a two-story brick-concrete structure building, built in the 1970 s and 1980 s, and was the internal canteen of the Fengshan Sub-district Office. The staff of the street office told reporters that it was lunch time when the explosion occurred, and more than 20 employees were eating in the canteen. When the explosion occurred, the dining employees could not evacuate in time.

Reporters found that the rescue is not small. As the canteen is located on the hillside behind the office building of the subdistrict office, vehicles are impassable and large rescue equipment is difficult to enter, so rescuers have to use pickaxes, shovels and steel drills to dig out and remove the building materials. In order to avoid secondary injury to the trapped people, fire rescue personnel used wooden boards to jack up the collapsed floor and dispatched a number of search and rescue dogs to search for the trapped people between the gaps.

In addition, because the trapped personnel are concentrated in a small space of less than 100 square meters, and the carrying capacity of personnel is limited, rescuers can only take turns to rescue, which has a great impact on the progress of search and rescue. After nighttime, the difficulty of night rescue further increased. After more than 10 hours of intense rescue, a total of 26 trapped people have been searched and rescued at the scene, of which 16 died after the rescue failed, and one of the 10 injured was in critical condition.

Preliminary judgment of "suspected gas leakage and explosion" State Council Safety Committee listed to supervise the investigation and handling of accidents

According to the investigation of the on-site emergency headquarters, the cause of the accident was initially determined to be suspected gas leakage and explosion. The gas leak filled the canteen kitchen with natural gas and exploded when exposed to an open flame.

The main components of gas and natural gas used by urban residents are colorless and odorless.Methane CH4The natural gas is added with odor agent before entering the house, so that the user can find the gas leak in time. After the gas leak, why the relevant personnel failed to find the danger in time? Gas safety expert analysis, due to the relatively complex kitchen odor, the odor alone may not be able to accurately determine. And the kitchen is located in the corner of the canteen, a certain distance from the restaurant seat, diners may not smell the obvious smell.

Article 36 of the "the People's Republic of China Safety Production Law" stipulates that if production and business units in catering and other industries use gas, they shall install combustible gas alarm devices. "At present, the installation rate of combustible gas alarm devices in operating businesses such as hotels and restaurants is relatively high, and there are no mandatory requirements for internal canteens of government agencies, enterprises and other units." The staff of the emergency management department involved in the handling of the accident told reporters that whether the canteen has been installed with relevant devices and whether the devices are in normal use remains to be further ascertained. At midnight on the 7th, after the on-site rescue work was completed, the relevant departments had entered the site to investigate the fire point of the accident, the source of the open fire, and the structure of the house.

At present, the Chongqing Municipal Party Committee and the Municipal Government have established an accident investigation team headed by the deputy mayor in charge to investigate the cause and responsibility of the accident in accordance with laws and regulations. The Safety Committee of the State Council decided to supervise the investigation and handling of the cafeteria collapse accident in Fengshan Sub-district Office, Wulong District, Chongqing.

Accident Warning: Gas Safety "One Meter After zui" Needs to Watch

On June 13, 2021, a gas explosion occurred in a community market in Shiyan, Hubei, killing 26 people and injuring 138; on September 10, a liquefied petroleum gas leakage explosion occurred in a residential building in Dalian, Liaoning; on October 21, a natural gas leakage accident occurred in a hotel in Shenyang, Liaoning... In the past six months, gas safety accidents have occurred in many places, causing many casualties.

The reporter learned that in the second half of 2021, the Chongqing Municipal Government launched a special rectification of the city's gas and oil industry safety, and conducted interviews with districts and counties where more gas safety hazards were found to supervise rectification, requiring timely elimination of safety hazards. The collapse of the Wulong canteen has once again sounded the alarm for gas safety.

"Gas safety involves construction, operation, transportation, use and other links, and various safety measures must be in place." Peng Shini, a professor at the School of Civil Engineering of Chongqing University who has long been engaged in gas safety research, suggested speeding up the implementation of the aging renovation of gas pipelines, building a digital map of the gas pipeline network and a risk monitoring and early warning platform, thoroughly investigating and correcting the hidden risks of the whole chain, and improving the level of gas safety.

The installation of combustible gas alarm device is one of the methods to improve the prevention and control of gas safety risks. Experts call for the comprehensive promotion of leak alarms, safety self-closing valves and other safety devices to standardize the installation and use, and build a strong safety line of defense. For all kinds of enterprises and institutions, such as canteens and other centralized gas use places, norms should be formulated to require the mandatory installation of combustible gas alarm devices, and a regular safety inspection system should be established.

Cheng De'an, a member of the Chongqing Municipal Committee of the Chinese People's Political Consultative Conference, suggested that family and unit gas users should strengthen the popularization of gas safety knowledge and skills training, improve gas safety awareness, and ensure gas safety from the source of gas users, thereby greatly reducing gas safety accidents. occur.

AndCombustible gas alarm deviceThe core component of is a natural gas sensor. Here is oneNatural gas sensorTGS2611，The sensor has the characteristics of small size, low power consumption, fast response and high sensitivity. It is very suitable for portable gas pipeline leak detection and can also be used for home gas alarms.

TGS2611It is a semiconductor principle natural gas sensor developed by Figaro in Japan. It has the characteristics of long service life, long-term stable performance and rapid response. At the same time, it also has good sensitivity to flammable gases such as propane, butane and alcohol. If it is required to resist the interference of organic solvents such as alcohol, it can be usedTGS2611-E00。

Natural gas sensorTGS2611Important parameters:

Detection principle: oxide semiconductor

Detection object: natural gas

Response time T90:<10s

Recovery time:<1min

Detection range: 500-10000ppm(CH4)

Heating power consumption: 280mW

Heating voltage VH:5.0±0.2V

Loop voltage VC:5.0±0.2V