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低氮燃燒器和普通燃燒器的區別有哪些？
低氮燃燒器和普通燃燒器的區別有哪些？
發布時間：
2022-12-20 18:00
來源：
作者：
低氮燃燒器是一款在普通燃燒器基礎之上，通過技術上的優化，達到氮氧化合物降低的一種燃燒器總稱。從本質上來說，低氮燃燒器采用了對燃燒過程進行管控的一種技術提升。在設計時，除了考慮實現功率輸出及材料耐溫等方面因素之外，針對低氮需求，會采用各種方法減弱各生成因素的影響，從而實現較低的NOx排放值，例如：
1、通過分級、分段、濃淡型配合等方式，使燃燒在局部空間及某一階段內，空氣、燃氣配比偏離化學當量比，可有效控制局部火焰溫度，從而減少熱力型NOx的產生；
2、通過提高混合效果的方式，如預混燃燒，當空氣與燃氣混合效果越好時，可大程度減薄高溫區的火焰厚度，并降低煙氣在較高溫區的行程距離及停留時間，從而減少熱力型NOx的產生；
3、通過煙氣再循環的方式，利用燃燒煙氣進行回流摻混，降低煙氣中的氧含量，過量的N2及燃燒產物也會降低火焰溫度，從而抑制NOx的產生，這是目前在鍋爐上較為常用的方式之一；
4、通過分割火焰區域，提升避免火焰過于集中的產生，降低反應停留時間；
按照以上降低Nox的方法，低氮燃燒器大致分為以下幾類:階段燃燒器、自身再循環燃燒器、濃淡型燃燒器、分割火焰型燃燒器、混合促進型燃燒器、低NOx預燃室燃燒器等。
低氮燃燒器跟普通燃燒器的區別在于以下三點：
1、增強鍋爐傳熱性能，提高熱效率，降低鍋爐運行成本，減少支出；
2、新購鍋爐周期長，時間等待長，影響生產，而低氮改造則只需要短時間的施工即可完成改造，節約時間：
3、低氮改造符合國家環保政策，是利國利民的優選。
What are the differences between low nitrogen burner and ordinary burner？
Low nitrogen burner is a general name of burner that can reduce nitrogen oxides based on ordinary burner and through technical optimization. In essence, the low nitrogen burner adopts a technology improvement to control the combustion process. In addition to factors such as power output and material temperature resistance, various methods will be adopted to reduce the impact of various generation factors for low nitrogen demand, so as to achieve a lower NOx emission value, such as:
1. By means of grading, segmentation, and concentration dilution, the ratio of air and gas deviates from the chemical equivalent ratio in local space and at a certain stage of combustion, which can effectively control the local flame temperature, thereby reducing the generation of thermal NOx;
2. By means of improving the mixing effect, such as premixed combustion, when the mixing effect of air and gas is better, the flame thickness in the high temperature zone can be minimized, and the travel distance and residence time of flue gas in the high temperature zone can be reduced, thus reducing the generation of thermal NOx;
3. By means of flue gas recirculation, the combustion flue gas is used for backflow mixing to reduce the oxygen content in the flue gas. Excess N2 and combustion products will also reduce the maximum flame temperature, thus inhibiting the generation of NOx, which is one of the more common methods in boilers at present;
4. By dividing the flame area, improve to avoid the generation of too concentrated flame, and reduce the reaction residence time;
According to the above methods of NOx reduction, low nitrogen burners are roughly divided into the following categories: stage burners, self recirculation burners, rich and lean burners, split flame burners, mixing promotion burners, low NOx precombustion chamber burners, etc.
The difference between low nitrogen burner and ordinary burner lies in the following three points:
1. Enhance the heat transfer performance of the boiler, improve the thermal efficiency, reduce the operating cost of the boiler and reduce expenditure;
2. The cycle of newly purchased boiler is long and the waiting time is long, which affects the production, while the low nitrogen transformation can be completed in a short period of time, saving time:
3. Low nitrogen transformation conforms to the national environmental protection policy and is the first choice for the benefit of the country and the people.
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