You can use gas if you can't fill natural gas in a restaurant. Gas includes natural gas and liquefied petroleum gas. Hotel gas belongs to catering gas, and both of the above gas sources can be used. When using canned liquefied gas, you need to buy your own gas tank. In the process of using liquefied gas cylinders, you must go to the cylinder testing station approved by the labor department for regular inspection and maintenance. However, only a few state-owned gas filling companies can really fulfill the regulations, and most individual filling stations (points) do not follow the rules. Coal gas is a gas containing combustible components, which is processed from coal. According to the processing method, gas properties and uses, it can be divided into: water gas, semi-water gas and air gas (or producer gas) are obtained from coal gasification. These gases have low calorific value, so they are collectively called low calorific value gases; The gas obtained by coking in coal dry distillation is called coke oven gas. It belongs to medium calorific value gas and can be used as civil fuel in cities. Carbon monoxide and hydrogen in coal gas are important chemical raw materials.