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How do condensing boilers achieve low emissions?

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my country is one of the countries that strictly implement environmental governance. As far as we know, starting from April 1, 2017, Beijing will prohibit new boilers with nitrogen oxide emissions higher than 30 mg. Ordinary gas-fired boilers cannot meet this requirement, but only fully premixed condensing boilers using low-nitrogen combustion technology to meet this requirement.

1. The harm of nitrogen oxides

       Nitrogen oxides are a general term for gases such as nitric oxide and nitrogen dioxide, which are formed by the reaction of nitrogen and oxygen in the air under high temperature conditions. Nitrogen oxides combine with water in the air and are eventually converted into nitric acid and nitrates. Nitric acid is one of the causes of acid rain; it and other pollutants can produce photochemical smog pollution under certain conditions. Acid rain hazards are multifaceted, including direct and potential hazards to human health, ecosystems and buildings.

2. Nitrogen oxide emission standards

       We know that the use of gas boilers to replace coal-fired boilers can greatly reduce pollution, but the nitrogen oxide emissions of ordinary gas-fired boilers are also higher than 30 mg, unless they are equipped with low-nitrogen burners, but the boilers using low-nitrogen burners themselves are also There are special requirements, and the condensing boiler using full premix combustion technology can meet this requirement. The nitrogen oxide emission of the condensing boiler of Henan Fangkuai Boiler Factory is 18mg.

3. How to reduce nitrogen oxide emissions

       The fully premixed burner for condensing boilers fully mixes gas and air in an appropriate ratio through a multifunctional gas/air proportional control valve, and then ignites and burns. Appropriate gas-to-air ratio will make the gas fully combusted, and the excess air coefficient will be controlled at about 1.2-1.3, which can not only condense the water vapor in the flue gas, release the latent heat, but also reduce the emission of nitrogen oxides.

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