Introduction of low nitrogen burner
- Author:Shenzhen Zhongli Weiye Electromechanical Equipment Co., Ltd
- Origin:Shenzhen Zhongli Weiye Electromechanical Equipment Co., Ltd
- Time of issue:2021-07-06 16:24
Introduction of low nitrogen burner
Low nitrogen burners and low nitrogen oxide burners refer to burners with low NOx emissions during fuel combustion. Low NOx burners can reduce NOx emissions during combustion. The nitrogen oxides produced in the combustion process are mainly no and NO2, which are commonly 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%. The no generated by general fuel combustion mainly comes from two aspects: one is the oxidation of nitrogen in the air used for combustion (combustion supporting air); Second, the nitrides contained in the fuel are thermally decomposed and reoxidized during combustion. In most combustion devices, the former is the main source of No. we call this kind of no "thermal reaction no", the latter "fuel no", and there is also "instant no".
No formed during combustion can react with intermediate products containing nitrogen atoms to reduce no to NO2. In fact, in addition to these reactions, no can also react with various nitrogen-containing compounds to form NO2. When the reaction reaches chemical equilibrium in the actual combustion device, the [NO2] / [no] ratio is very small, that is, the conversion of no to NO2 is very small, which can be ignored. Combustion technology for reducing NOx NOx is generated by combustion, and combustion methods and combustion conditions have a great impact on the generation of NOx. Therefore, NOx can be reduced by improving combustion technology
Low nitrogen burner usually refers to the burner with NOx emission of 30 ~ 80 mg; An ultra-low nitrogen burner with NOx emission below 30 mg is usually called;
Low nitrogen burners are often based on the following technologies:
1. Electronic proportional regulation and oxygen content control technology to accurately control 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;
At present, low nitrogen burners in the market are mainly divided into the following types:
1. Surface combustion ultra-low nitrogen burner;
The surface combustion ultra-low nitrogen burner can generally control NOx within 30 mg within the full fire range, which has the advantages of simple installation and no need for FGR flue gas recirculation pipeline; Its main disadvantage is that it needs to filter air, which increases the maintenance workload; At the same time, the oxygen content is about 7%, which reduces part of the combustion efficiency;
2. Staged burner;
The staged burner can usually control NOx to 65 mg within the full fire range, and the limit is about 40 mg. Further reducing NOx emissions may lead to combustion instability or sacrifice adjustable ratio and other disadvantages;
3. Staged Burner + FGR flue gas in circulation technology;
The staged Burner + FGR flue gas recycling technology combines the advantages of NOx control of the staged burner and the advantages of oxygen content reduction of FGR. It can control NOx to 20 mg level in the full fire range, and at the same time control the oxygen content within 3%, so as to maximize the combustion efficiency. Its main disadvantage is the increase in equipment cost.
On the basis of absorbing advanced technologies and processes at home and abroad, Shenzhen Zhongli Weiye Electromechanical Equipment Co., Ltd. integrates years of wisdom and experience in burners. The accuracy, stability and reliability of products occupy an important position in China. The Zhongli Weiye brand burner produced by our company has been gradually upgraded from the first generation to the current third generation, and is still developing more high-end products. It is an advanced ultra-low nitrogen burner enterprise in China. With advanced technology, excellent quality and perfect service, our products are among the forefront of the super burner industry in China, and have become a well-known brand in China. Our products are all over the country. We actively advocate; Take the market as the guide, scientific research as the leader, and innovation as the means to actively explore domestic and foreign markets.