Flue gas desulfurization system using dry alkali electrostatic spraying and flue gas humidification cooling method

Abstract

The invention discloses a flue gas desulfurization system using a dry alkali electrostatic spraying and flue gas humidification cooling method. The system utilizes less equipment and has simple processes so that an overall cost of the system in small unit desulfurization retrofitting is lower than those of other desulfurization technologies. The system has high desulfurization efficiency. The invention also provides a flue gas desulfurization technology using a dry alkali electrostatic spraying and flue gas humidification cooling method. The flue gas desulfurization technology is a novel dry desulfurization method overcoming the limitation. The flue gas desulfurization system using a dry alkaline process utilizes an alkali as an absorbent and the absorbent is expensive and is suitable for flue gas humidification of a small unit. The whole system utilizes less equipment and has simple processes so that in small unit desulfurization retrofitting, the overall cost of the system is lower than those of other desulfurization technologies.

Description

technical field [0001] The invention relates to a dry flue gas desulfurization system, in particular to a dry alkali (such as using NaOH or Ca(OH) 2 A flue gas desulfurization system using the same alkali powder as an absorbent) electrostatic spraying and flue gas humidification and cooling method; in addition, the invention also relates to a dry alkali electrostatic spraying and flue gas humidification and cooling method flue gas desulfurization process technology. Background technique [0002] At present, several commonly used dry flue gas desulfurization processes are as follows: [0003] A. Direct injection dry flue gas desulfurization process: [0004] The process is to inject Ca(OH) directly into the flue 2 , Na 2 CO 3 or NaHCO 3 A simple dry flue gas desulfurization process using powder as an absorbent, this process does not have an absorption tower, and the entire desulfurization process is carried out in the flue. The limitations of this process are: First, it...

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Problems solved by technology

[0013] First of all, because of its complete system, its system setup is complicated, it occupies a large area and its cost is high, and it has strict requirements on the height difference between the dust collector and the absorption tower. Therefore, this process is only suitable for the flue gas desulfurization system of medium-sized boiler units. This process is not suitable for many small units to be transformed

[0014] Secondly, due to the addition of circulating ash, the load on the downstream bag filter increases significantly, which directly affects the service life of the filter bag