Natural gas boilers are boiler equipment that uses natural gas as the main fuel. Compared with coal-fired and biomass boilers, the degree of environmental protection is very high. However, it cannot be ignored that harmful substances still exist in the combustion exhaust gas of natural gas boilers, which need to be reasonably controlled.

　　If you want to know what components are contained in the combustion exhaust gas of a natural gas boiler, you must first know the composition of natural gas. Natural gas is composed of alkanes, the main component is methane, and a small amount of ethane, propane and butane, in addition to hydrogen sulfide, nitrogen and water vapor. The combustion formula is

　　CH4+2O2=CO2+2H2O

　　H2S+2O2=SO2+2H2O

　　N2+O2=NO2

　　Through the chemical reaction formula, we know that the combustion exhaust gas of natural gas boiler mainly contains carbon dioxide, water, carbon monoxide, sulfur dioxide, nitrogen monoxide, nitrogen dioxide and so on. Among them, sulfur dioxide, nitrogen oxides, and smoke are the main pollution factors in the combustion exhaust gas of natural gas boilers, and they are important influencing factors of air pollution.

　　1. Sulfur dioxide

　　Natural gas contains hydrogen sulfide, which generates an equal volume of sulfur dioxide when burned. The state stipulates that its ex-factory content cannot exceed 0.01%. In the "Boiler Air Pollutant Emission Standards", it is stipulated that the sulfur dioxide of natural gas boilers shall not exceed 100mg/Nm3.

　　2. Nitrogen oxides

　　In the "Boiler Air Pollutant Emission Standard", it is stipulated that the nitrogen oxide emission of natural gas boilers shall not exceed 80mg/Nm3.

　　3. Smoke and dust

　　Natural gas is a clean energy source, and the amount of smoke and dust generated is small, but it cannot be said that there is no such thing. In the "Boiler Air Pollutant Emission Standards", it is stipulated that the smoke and dust of natural gas boilers shall not exceed 10mg/Nm3.