Desulfurization Industry

In power plant desulfurization, boiler flue gas desulfurization, powder flue gas desulfurization and other processes, the desulfurization technology can be divided into wet, dry and semi-dry desulfurization according to the dry and wet state of absorbent and desulfurization products in the desulfurization process.

  • Wet desulfurization is the use of absorbent solution or slurry in the wet state desulfurization and treatment of desulfurization products, desulfurization reaction speed, simple equipment, high desulfurization efficiency, but serious corrosion, high operation and maintenance costs, resulting in secondary pollution wet desulfurization process mainly include: limestone gypsum method, seawater method, double alkali method, sodium cycle method, magnesium oxide method.
  • Dry desulfurization means that the desulfurization absorption and product treatment are carried out in a dry state. During the desulfurization process, there is no sewage discharge, the equipment is less corroded, and the secondary pollution is less.However, the desulfurization efficiency is low, the reaction speed is slow, and the equipment required is too large. The main dry desulfurization processes mainly include: charged dry absorbent jet desulfurization method, electron beam irradiation method, adsorption method, etc.
  • Semi-dry desulfurization refers to the flue gas desulfurization technology in which the desulfurizer is desulfurized in a dry state and regenerated in a wet state, or desulfurized in a wet state and desulfurized in a dry state. It combines wet and dry desulfurization processes advantages and has broad application prospects. The semi-dry desulfurization processes mainly include: spray drying method, circulating fluidized bed method, humidified ash circulation method, flue injection method, etc.



At present, the power plant desulfurization technology is dominated by wet desulfurization process, while dry and semi-dry desulfurization process are also developing.The operation of the desulfurization device in the desulfurization of the power plant divides the desulfurization ups and downs into several links. Among them, the most prone to foaming problem is the desulfurization tower slurry treatment link, which needs to be treated with defoaming agent for defoaming.


The function and advantage of defoamers

Adding a suitable defoamer in the desulfurization process can reduce the surface tension of water, solution, suspension, etc., and effectively prevent the impact of foam on the desulfurization process. At the same time, the special defoamer for desulfurization has good chemical stability and heat resistance, and has a wide range of applications, which can reduce the loss in desulfurization and improve the working efficiency of the entire desulfurization system.


Causes of foam:

1.The active substances contained in the desulfurization slurry have foaming properties

2.The water quality is poor and there are too many impurities in the slurry

3.Environmental impact of high temperature and high pressure

4.Chemical reactions in the process of desulfurization


Adverse reactions that can be avoided by using defoamers:

1.Avoid the false liquid level of the desulfurization tower caused by foam, which affects the desulfurization efficiency

2.Avoid damage to desulfurization equipment caused by foam and affect the normal operation of the desulfurization system

3.Avoid slurry overflow caused by foam overflow and pollute the factory environment

4.Avoid the increase of desulfurization cost caused by foam and reduce work efficiency



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