Children were injured when firecrackers exploded in the manhole. Why does throwing firecrackers into the manhole cause an explosion?

Throwing firecrackers into the manhole caused an explosion and the child was injured. Throwing firecrackers into the manhole will cause an explosion, because there is methane deposition in the manhole, which is easy to explode when it meets an open flame.

One: A child threw firecrackers into the manhole, causing an explosion. Just when everyone was happy, a sad news came from Ningxia. A 10-year-old boy in Yongning county, Ningxia, threw firecrackers into the manhole, causing an explosion. The boy was blown 5 meters before he could dodge. According to the community staff, when the medical staff arrived at the scene, the child had no vital signs. It is understood that this dead boy 10 years old, just entered the fourth grade of primary school. Near the Chinese New Year, the canteen near the home of the little boy who died sold small firecrackers for his children to play with, so the little boy bought firecrackers to play with like other children, but unexpectedly, he would squat on the manhole cover, light a firecracker and throw it into the manhole. This action instantly triggered an explosion, and the boy was blown out more than 2 meters high and fell 5 meters away, which unfortunately killed him.

2. The cause of the explosion caused by throwing firecrackers into the manhole Generally speaking, there will be a lot of organic matter metabolism in urban sewers, which will produce combustible gases such as hydrogen sulfide, methane and ammonia. When these combustible gases meet open flames and air, they are very likely to cause explosions. This kind of long-term sealed manhole is more likely to cause explosion, and the consequences of urban sewer explosion are relatively less serious. If it's a rural sewer, it's not just a sewer. Generally, there are septic tanks and biogas digesters. Once they encounter an open flame, their power is equivalent to a cannonball. Near the Spring Festival, there are vendors selling small firecrackers in the streets. Family members should tell their children not to use firecrackers as toys to avoid irreparable consequences.

Three: Be careful when playing firecrackers in the New Year. Many people like to set off the lively atmosphere of the New Year by playing firecrackers, but playing firecrackers requires caution. Remind children with children at home to stay away from the manhole cover when playing firecrackers. At the same time, they should also pay attention to try not to let children set off firecrackers alone, so as not to cause irreparable consequences. Parents should also set an example by setting off fireworks. Firecrackers should be put and bought now. Don't keep them, and don't store them behind the car or on the balcony. At the same time, community streets should also set up safety warnings, such as marking beside manhole covers? Firecrackers are forbidden around the manhole cover? 、? It is forbidden to throw firecrackers into the manhole cover? 、? No shooting by hand? And other warning signs, warning everyone to set off fireworks and explosions in a safe and standardized way.

This year, because of the epidemic prevention and control, we can't even get together for the New Year. Although the Chinese New Year is not as lively as in previous years, we should pay attention to the safety details and not take it lightly.