The number of gas delivery phones varies from place to place, so it is not fixed.
Gas:
Coal gas is a combustible gas processed from coal.
According to the processing mode, gas properties and uses, it is divided into: coal gasification to obtain water gas, semi-water gas and air gas;
These gases have low calorific value and belong to medium calorific value gases, which can be used as urban civil fuels.
Carbon monoxide and hydrogen in coal gas are important chemical raw materials.
Gas application:
Mixed gas is widely used as heating fuel for various industrial furnaces;
In addition, "semi-water gas" is obtained by blowing steam and air together;
It can be used as fuel, or as raw material for synthetic ammonia, petroleum, organic synthesis, hydrogen production, etc.
Natural gas is an important energy source, widely used as city gas and industrial fuel; In the world energy consumption in 1970s, natural gas accounted for about 18% ~ 19%.
Natural gas is also an important chemical raw material.