Ammonia process desulphurization tail gas aerosol purifying method

Abstract

The invention discloses an ammonia method desulphurization tail gas aerosol purifying method. An ultrasonic atomization technology is combined with a low pressure drop micro-cyclone demisting technology to control aerosol in ammonia gas desulphurization tail gas. The method comprises the following steps: atomized water drops with the dimensions approaching the dimensions of aerosol are generated through ultrasonic atomization by using an ultrasonic atomization head at the top of a desulfurization tower, the atomized water drops collide with aerosol particles in ascending flue gas and agglomerate to form 5-15 [mu]m fog drops, the grown fog drops are preliminarily separated through a mesh demister, the separated drops enter a low pressure drop cyclone demister and undergo cyclone separation o make 90% or above aerosol particles settle, the settled aerosol particles are discharged from the bottom outlet of a cyclone, and treated gas is discharged from the upper opening of the cyclone.

Description

technical field [0001] The invention relates to an ammonia method desulfurization tail gas aerosol purification technology, which belongs to the field of energy saving and environmental protection. Background technique [0002] In the ammonia flue gas desulfurization process, when the flue gas passes through the baffle demister in the tower, most of the liquid droplets entrained in the flue gas are removed, while the suspended solid or liquid small particles in the gas cannot be removed. The so-called aerosols. Since the flue gas in the absorption tower contains saturated water vapor, when the flue gas exits the tower and enters the atmosphere, the temperature drops rapidly, and the ammonium salts contained in the flue gas immediately condense into mist and particles, which are suspended in the atmosphere and form Aerosol, larger droplets fall to the ground. Therefore, if this aerosol is directly discharged into the atmosphere through the chimney without treatment, it will...

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Problems solved by technology

[0008] A common problem in current aerosol treatment technologies is that they do not start from the formation and basic properties of aerosols. A key issue in aerosol removal is that conventional separation methods have limited removal effects on micro-sized aerosols. The size of the aerosol is mainly concentrated in 0.07-1.0 μm. It is difficult to separate particles of this size by conventional demisting methods. The method adopted in this patent is to promote the size growth of aerosol particles through collisions between particles and changes in temperature. , so as to achieve the size that can be removed, and remove the aerosol in the tail gas through the low pressure drop cyclone separation technology

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