What are the dangers of using coal gasification?

There will be problems such as air leakage, explosion and gas poisoning. Gases are also called gas, liquefied petroleum gas and liquefied natural gas. The gas is colorless, odorless and odorless, but the gas we use has a pungent smell, which is artificially added to prevent gas leakage and alert people to it. The permeability of gas is 1.6 times that of air, and it is hardly soluble in water, so it can't keep breathing without burning. When it reaches a certain concentration, it can make people suffocate due to lack of oxygen, and it can also burn or explode. Gas exists in coal or surrounding rock in free state and adsorption state. The main components of the gas we use every day are alkanes, of which methane accounts for the vast majority, and a small amount of ethane, propane and butane. In addition, it generally contains hydrogen sulfide, carbon dioxide, nitrogen and water vapor, and a small amount of inert gases, such as helium and argon. Under standard conditions, methane to butane exists in gaseous state, and above pentane is liquid state. When exposed to an open flame, it can burn and explode, which directly threatens people's life safety.