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Definition of Low NOx Burners and Low NOx Burners
- Author:Shenzhen Zhongli Weiye Electromechanical Equipment Co., Ltd.
- Origin:Shenzhen Zhongli Weiye Electromechanical Equipment Co., Ltd.
- Time of issue:2021-06-03 14:50
Definition of Low NOx Burners and Low NOx Burners
It refers to a burner with low NOx emission during the fuel combustion process. The use of a low NOx burner can reduce the emission of nitrogen oxides during the combustion process.
The nitrogen oxides produced in the combustion process are mainly NO and NO2, which are generally referred to as nitrogen oxides NOx. A large number of experimental results show that the nitrogen oxides emitted by the combustion device are mainly NO, accounting for about 95% on average, while NO2 only accounts for about 5%.
Generally, NO generated by fuel combustion mainly comes from two aspects: one is the oxidation of nitrogen in the air used for combustion (combustion air); the other is the thermal decomposition and reoxidation of nitrogen compounds contained in the fuel during the combustion process. In most combustion devices, the former is the main source of NO, which we refer to as "thermal reaction NO", the latter as "fuel NO", and there is also "prompt NO".
The NO formed during combustion can react with intermediates containing nitrogen atoms to reduce NO to NO2. In fact, in addition to these reactions, NO can also form NO2 with various nitrogen-containing compounds. When the reaction reaches chemical equilibrium in the actual combustion device, the ratio of [NO2]/[NO] is very small, that is, the conversion of NO to NO2 is very small and can be ignored. Combustion technology
to reduce NOx
NOx is generated by combustion, and the combustion method and combustion conditions have a great influence on the formation of NOx, so NOx can be reduced by improving combustion technology. The main ways are as follows:
use fuel with lower N content, Including fuel denitrification and conversion to low-nitrogen fuel;
reducing the excess air coefficient and organizing excessively rich combustion to reduce the oxygen concentration around the fuel;
in the case of less excess air, reducing the temperature peak to reduce "thermal reaction NO";
in oxygen At lower concentrations, increase the residence time of combustibles in the flame front peak and reaction zone. The specific methods usually used to
reduce the formation and emission of NOx are: staged combustion, afterburning method, low oxygen combustion, concentration deviation combustion and flue gas recirculation.
烟气在高温区停留时间是影响One of the main factors of NOx generation is to improve the mixing of combustion and air, which can reduce the thickness of the flame surface. Under the condition of constant combustion load, the residence time of flue gas in the flame surface, that is, the high temperature area, is shortened, thus reducing NOx production is reduced. Mixing-promoting burners are designed according to this principle.
6. Low NOx pre-chamber burner The
pre-chamber is a high-efficiency, low-NOx staged combustion technology developed and researched in China in the past 10 years. The pre-chamber is generally composed of primary air (or secondary air) and a fuel injection system. Quickly mix with the primary air to form a fuel-rich mixture in the primary combustion zone in the pre-combustion chamber. Due to lack of oxygen, only part of the fuel is burned, and the fuel precipitates volatile matter in the primary flame zone where oxygen is poor and the flame temperature is low, thus reducing NOx generation.
Shenzhen Zhongli Weiye Electromechanical Equipment Co., Ltd., on the basis of absorbing domestic and foreign advanced technology and craftsmanship, has accumulated many years of wisdom and experience in burners, and the accuracy, stability and reliability of products are in an important position in China. Our company produces Zhongli Weiye brand burner has been gradually upgraded from the first generation product to the current third generation product, and is still developing higher-end products. It is an advanced ultra-low nitrogen burner enterprise in China.With advanced technology, excellent quality and perfect service, our company's products rank in the forefront of the domestic super-burner industry, and have become a well-known domestic brand, with products all over the country, we actively advocate; market-oriented, scientific research The leader, with innovation as a means, actively explores domestic and foreign markets.
Web：www.szburners.comAddress: No. 2268, Longgang section, Longgang Avenue, Longgang District, Shenzhen
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