低氮燃燒器的選擇標準

最近幾年對人們生活影響極大的霧霾、臭氧污染和酸雨都和氮氧化物（NOx）息息相關。氮氧化物（NOx）對環境的損害作用極大，氮氧化物與空氣中的水結合最終會轉化成硝酸和硝酸鹽，硝酸是酸雨的原因之一；它與其它污染物在一定條件下能產生光化學煙霧污染。

隨著鍋爐機組朝著大容量高參數方向發展，實現高效燃燒，減少污染物排放，提升煤種適應性，提升運行安全性和可靠性是現代燃燒技術追求的目標。這其中，有效降低氮氧化物排放量更是擺在了首位。 

In recent years, haze, ozone pollution and acid rain that affect people's lives are closely related to nitrogen oxides (NOx). Nitrogen oxides (NOx) have great damage to the environment. The combination of nitrogen oxides and water in the air will eventually convert into nitric acid and nitrate. Nitric acid is one of the reasons for acid rain; it can produce photochemical smog under certain conditions.

With the development of large capacity and high parameters in the direction of boiler units, it is the goal of modern combustion technology to achieve high efficiency combustion, reduce pollutant emission, improve the adaptability of coal and improve the safety and reliability of operation. Among them, the effective reduction of NOx emissions is the first place.

低氮燃燒器選擇考慮的主要參數

1. NOx 排放

必須滿足國家和地方的環保排放要求，在滿足要求的前提下，從企業的社會責任角度出發，盡量應該選擇NOx排放更低的設備；

2. 尾氧含量

為了達到充分燃燒的極限過?？諝庀禂禐榇蠹s1.1, 對應的理論尾氧含量為大約2%. 更高的尾氧含量通常意味著燃燒器效率的降低。理想的燃燒器最好尾氧含量可以控制在3%以內；市場上表面燃燒的燃燒器的尾氧含量通常在7%左右，相對于3%的尾氧含量，意味著產生相同的熱量，需要多耗費大約6~8%的天然氣。對于常年運轉或者設備長期在較高負荷運轉，天然氣消耗量比較大的業主，選擇一款尾氧含量低的燃燒器對于降低運行成本至關重要。

3. 可調比

采用了電子比例調節的低氮燃燒器通常應該具備至少５：１以上的高可調比。更低的可調比意味著實際運行過程中更多的ON/Off啟停，同時也意味著更多的天然氣消耗。除非是負荷常年在一個比較小的穩定區間的鍋爐，選擇一個高可調比的燃燒器對于降低天然氣的消耗，降低運行成本，延長設備的使用壽命非常重要。

4. 其它主要考慮因素

燃燒穩定性是選擇低氮燃燒器的主要考慮因素，包括設備本身的可靠性。由于在北京實施低氮標準之前，全世界范圍內實施低氮標準的區域主要在美國，所以基本上只有主要銷售市場在美國的燃燒器品牌在低氮燃燒器領域具有比較長的應用經驗。

Main parameters of low nitrogen burner selection

1. NOx emission

It is necessary to meet the national and local environmental emission requirements. On the premise of meeting the requirements, from the point of view of the social responsibility of the enterprise, we should choose the lower NOx emission equipment as far as possible.

2. tail oxygen content

To achieve full combustion limit excess air coefficient is about 1.1, the corresponding theoretical tail oxygen content is about 2%. higher tail oxygen content usually means reducing the burner efficiency. The best tail oxygen content of the ideal burner can be controlled within 3%; the tail oxygen content of the combustor on the market is usually about 7%, compared with the 3% tail oxygen content, which means that the same amount of heat is produced and the natural gas of about 6~8% is needed. For the owners who run for a long time or the equipment is running at a high load for a long time and the gas consumption is large, it is very important to choose a burner with low tail oxygen content to reduce the operating cost.

3. adjustable ratio

The low nitrogen burner with electronic proportional adjustment should normally have a high adjustable ratio of at least 5:1. The lower adjustable ratio means more ON/Off startup and shutdown in actual operation, and at the same time it means more natural gas consumption. It is very important to choose a high adjustable burner for reducing the consumption of natural gas, reducing the operating cost and prolonging the service life of the equipment, unless it is a boiler in a relatively small stable interval.

4. other major considerations

Combustion stability is the main consideration for choosing low nitrogen burner, including the reliability of the equipment itself. Before the implementation of the low nitrogen standard in Beijing, the world wide range of low nitrogen standards is mainly in the United States, so basically only the major sales markets in the United States have a long experience in the field of low nitrogen burner in the field of burner.