Natural gas boiler is a 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 there are still harmful substances in the combustion exhaust gas of natural gas boilers, which need to be controlled reasonably. In this article, XinLi boiler will tell you what the formula for calculating the exhaust gas emissions of natural gas boilers is based on the empirical method.

Natural gas boiler combustion exhaust gas

　　Natural gas is mainly composed of CH4, C2H6, C3H8, CO2, N2, H2S, CO, H2, O2.

　　Through the chemical reaction formula, the natural gas boiler combustion exhaust gas mainly contains carbon dioxide, water, carbon monoxide, sulfur dioxide, nitrogen monoxide, nitrogen dioxide, etc. Among them, sulfur dioxide, nitrogen oxides, and soot are the main pollution factors in the combustion exhaust gas of natural gas boilers, and are important factors affecting air pollution.

Calculation formula of exhaust gas emission of natural gas boiler

　　The calculation formula for the exhaust gas emission of natural gas boilers is relatively complicated. According to the example calculation on page 231 of the Practical Manual for Pollution Discharge Declaration and Registration, the exhaust gas generated by the complete combustion of 1 m³ of natural gas is 10.89 m³.

　　The exhaust gas produced by the actual combustion of natural gas is related to the composition of natural gas and the proportion of complete combustion, but it is generally considered that the amount of exhaust gas is 10-11 times that of natural gas. Taking 10 times is convenient for calculation, and taking 10.5 times seems more reasonable. Example: 10,000 m³ of natural gas, the amount of exhaust gas after combustion is 105,000 m³.

　　The formula for calculating the exhaust gas emissions of natural gas boilers is the amount of exhaust gas = 10.5 * 10,000 m³ of natural gas

Sulfur dioxide in the calculation formula of exhaust gas emissions from natural gas boilers

　　Natural gas contains hydrogen sulfide, and the state stipulates that its ex-factory content cannot exceed 0.01%. When hydrogen sulfide is burned in natural gas, an equal volume of sulfur dioxide is produced. According to the example calculation on page 231 of the Practical Manual for Sewage Discharge Declaration and Registration, when the hydrogen sulfide content is 0.0052%, the sulfur dioxide produced per 10,000 m³ of natural gas is 1.5kg. In the "Coal and Natural Gas Combustion Pollutant Generation Coefficient", the sulfur dioxide produced per 10,000 m³ of natural gas is 1.0kg.

Nitrogen oxides in the calculation formula of exhaust gas emissions from natural gas boilers

　　The article "Pollutant Generation Coefficient of Coal and Natural Gas Combustion" pointed out that the combustion of natural gas produces about 6.3kg of nitrogen dioxide per 10,000 m³.

Smoke and dust in the calculation formula of exhaust gas emissions from natural gas boilers

　　Natural gas is a clean energy source with little soot generation, but it cannot be said that there is no such thing. The article "Pollutant Generation Coefficient of Coal and Natural Gas Combustion" pointed out that every 10,000 m³ of natural gas combustion produces about 2.4kg of smoke and dust.

Other pollutants in the calculation formula of exhaust gas emissions from natural gas boilers

　　After calculation, the emissions of other pollutants produced by the combustion of natural gas are very low. In the regulations on the management of sewage charges, these pollution factors are not subject to sewage charges.