The generation of NOx in gas-fired low-nitrogen boilers can be mainly divided into thermal NOx (ThermalNOx), fast NOx (PromptNOx) and fuel NOx (FuelNOx).
1. Due to the low nitrogen content in natural gas, fuel-based NOx is not its main control type.
2. Thermal NOx refers to the oxidation of N2 in the combustion air at high temperature to generate NOx. Regarding the generation mechanism of thermal NOx, the Geridovich mechanism is generally used: when the temperature is lower than 1500 °C, the amount of thermal NOx generated is very small; when the temperature is higher than 1500 °C, the reaction rate will increase for every 100 °C increase in temperature. 6~7 times. In the actual combustion process, since the temperature distribution in the combustion chamber is not uniform, if there are local high temperature areas, more NOx will be generated in these areas, which may play a key role in the generation of NOx in the entire combustion chamber.
3. Rapid NOx is the rapid generation of NOx in the reaction zone when hydrocarbon fuel is burned and rich in fuel. In the actual combustion process, various factors change independently, and many parameters are constantly changing. Even the combustion of simple gas fuel must experience the mixing of fuel and air, and the combustion produces flue gas until it leaves the furnace. The temperature of the furnace, the mixing degree of fuel and air, the residence time of flue gas in the furnace and other parameters that have a great impact on NOx emissions are constantly changing.
Adhering to environmental protection is one of the rigid guidelines for production and life in all walks of life in my country. Generally speaking, most hotels are located in prosperous areas in the city center or in remote areas with better environmental quality. When purchasing a hot water boiler, you must pay attention to the emission of harmful substances and whether it is clean and environmentally friendly.
Natural gas boilers are widely used due to their unique characteristics of cleanliness, environmental protection, high efficiency and energy saving. If the area where your hotel is located has hard targets for environmental protection, then you should pay attention when choosing a hot water boiler. The most important point is to choose a professional boiler manufacturer with excellent quality, good reputation and high-end brand.
