In the transformation of ultra-low emission of industrial flue gas, wet desulfurization is often used for flue gas purification. The purified flue gas is discharged from the chimney, which often produces serious tailing, sometimes up to hundreds of meters. Although the net flue gas has reached the ultra-low emission level, it has caused visual pollution and a large waste of water resources. If ammonia desulfurization is adopted, some "ammonium sulfate rain" will cause serious corrosion to the surrounding equipment. Since the national policy no longer requires enterprises to de whiten the flue gas, it is necessary to improve the design of desulfurization system to avoid flue gas tailing.

下面以氨法脱硫为例，分析烟气拖尾的主要原因。

Taking ammonia desulfurization as an example, the main causes of flue gas tailing are analyzed.

1.物理因素

1. Physical factors

经过氨法脱硫系统的高温烟气与其隔断液相接触后逐步达到饱和状态。携带着液滴的烟气排入大气后凝结成白色，形成视觉上的拖尾效果，环境温度越低、烟气湿度越大拖尾现象越严重。

After the high-temperature flue gas of ammonia desulfurization system contacts with its partition liquid, it gradually reaches the saturation state. The flue gas carrying droplets condenses into white after being discharged into the atmosphere, forming a visual tailing effect. The lower the ambient temperature and the greater the flue gas humidity, the more serious the tailing phenomenon is.

2.氨逃逸

2. Ammonia escape

氨法脱硫过程中，作为脱硫剂的液氨或氨水会分解为气体氨与水，由于气体氨不易与烟气发生反应，会与烟气一起从烟囱排出，这就是氨逃逸，尤其是喷氨过量时，会加剧氨逃逸的现象，烟囱排出的烟羽会更长。

In the process of ammonia desulfurization, liquid ammonia or ammonia water as desulfurizer will be decomposed into gas ammonia and water. Because gas ammonia is not easy to react with flue gas, it will be discharged from the chimney together with flue gas, which is ammonia escape. Especially when excessive ammonia injection will aggravate the phenomenon of ammonia escape, and the smoke plume discharged from the chimney will be longer.

3.气溶胶

3. Aerosol

气溶胶是指液体或固体小质点在大气中分散悬浮形成的胶体分散体。氨法脱硫后的气溶胶主要成分是铵盐类，烟气中气溶胶含量越大，烟气的拖尾现象就越严重。

Aerosol refers to the colloidal dispersion formed by the dispersion and suspension of small liquid or solid particles in the atmosphere. The aerosol after ammonia desulfurization is mainly composed of ammonium salts. The greater the aerosol content in the flue gas, the more serious the tailing phenomenon of the flue gas.

针对烟气拖尾的各种原因，可以合理优化脱硫系统的工艺设计，减少或避免烟气拖尾现象。

For various reasons of flue gas tailing, the process design of desulfurization system can be reasonably optimized to reduce or avoid flue gas tailing.

以上就是为大家介绍的有关湿法脱硫的详细介绍,希望对您有所帮助.如果您有什么疑问的话,欢迎联系我们.我们将以专业的态度,为您提供服务

The above is the detailed introduction of wet desulfurization, which I hope will be helpful to you If you have any questions, please contact us We will provide you with professional service