Knowledge About Low-Nitrogen Burners and Low-Nitrogen Oxide Burners

Low-nitrogen burners and low-nitrogen oxide burners refer to burners with low NOx emissions during fuel combustion. The use of low-NOx burners can reduce the emission of nitrogen oxides during combustion.

Low-nitrogen burners and low-nitrogen oxide burners refer to burners with low NOx emissions during fuel combustion. The use of low-NOx burners can reduce the emission of nitrogen oxides during combustion. The nitrogen oxides produced during the combustion process are mainly NO and NO2, and these two nitrogen oxides are usually collectively referred to as nitrogen oxides NOx.

A large number of experimental results show that the nitrogen oxides emitted by combustion devices are mainly NO, accounting for an average of about 95%, while NO2 accounts for only about 5%. The NO generated by general fuel combustion mainly comes from two aspects: one is the oxidation of nitrogen in the air (combustion-supporting air) used for combustion; the other is the thermal decomposition and reoxidation of nitrogen compounds contained in the fuel during combustion. In most combustion devices, the former is the main source of NO. We call this type of NO "thermal reaction NO", the latter is called "fuel NO", and there is also "instant NO".

The NO formed during combustion can react with nitrogen-containing intermediates to reduce NO to NO2. In fact, in addition to these reactions, NO can also react with various nitrogen-containing compounds to generate NO2. When the reaction reaches chemical equilibrium in the actual combustion device, the [NO2]/ ratio 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 generation of NOx. Therefore, NOx can be reduced by improving combustion technology.

Low-nitrogen burners usually refer to burners with NOx emissions of 30~80 mg; NOx emissions below 30 mg are usually called ultra-low-nitrogen burners;
Low-nitrogen burners are often based on the following technologies:
1. Electronic ratio regulation and oxygen content control technology to accurately control the oxygen content;
2. Fully premixed surface combustion technology to reduce flame temperature and achieve full combustion;
3. FGR flue gas recirculation technology to reduce flame temperature and oxygen content;

The low-nitrogen burners on the current market are mainly divided into the following types:
1. Surface combustion ultra-low-nitrogen burners;
Surface combustion ultra-low-nitrogen burners can usually reduce NOx in the whole The advantage is that the installation is simple and no FGR flue gas recirculation pipeline is required; its main disadvantage is that the air needs to be filtered, which increases the maintenance workload; at the same time, the oxygen content is about 7%, which reduces the partial combustion efficiency;
2. Staged burner;
The staged burner can usually control NOx to 65 mg in the full fire range, and the limit is about 40 mg. Further reduction of NOx emissions may lead to unstable combustion or sacrifice of adjustable ratio and other disadvantages;
3. Staged burner + FGR flue gas recirculation technology;

The staged burner + FGR flue gas recirculation technology combines the advantages of staged burner NOx control and FGR oxygen content reduction, which can achieve NOx control to 20 mg level in the full fire range, while controlling the oxygen content within 3%, maximizing the combustion efficiency. Its main disadvantage is the increase in equipment cost.

Hebei Qianyue Thermal Energy Technology Co., Ltd. has absorbed advanced technologies and processes from home and abroad, and has accumulated wisdom and experience in burners over the years. The accuracy, stability and reliability of its products occupy an important position in China. The Zhongli Weiye brand burners produced by our company have been gradually upgraded from the first generation of products to the current third generation of products, and are still developing more high-end products. It is a domestic advanced ultra-low nitrogen burner enterprise. With advanced technology, excellent quality and perfect service, our company's products are at the forefront of the domestic ultra-low nitrogen burner industry and have become a well-known domestic brand. Our products are sold all over the country. We actively advocate; market-oriented, scientific research-led, innovation-based, and actively explore domestic and foreign markets.