The application of desulfurization defoamers in desulfurization units

Thread Content

With the rapid development of industry and **increasing emphasis on environmental protection, desulfurization processes in power plants have become an important part of power plant operations. The flue gas desulfurization processes in normal power plants can be divided into three main categories based on the state of the desulfurizing agent and the products of the desulfurization reaction: wet, dry, and semi-dry methods. Currently, wet flue gas desulfurization processes dominate among flue gas desulfurization technologies, while dry and semi-dry desulfurization processes are also under development. Since flue gas desulfurization in thermal power plants requires the use of desulfurization agents, and these agents are alcohols, practical trials and laboratory tests on foam formation have shown that ordinary organic silicon defoamers have little effect on eliminating foam in the slurry of the absorption towers used in desulfurization systems. Our company has specifically developed a desulfurization defoamer designed for use in amine treatment and diol dehydration units to control foam ； It has the following features: ★Rapid defoaming: This product is particularly effective when foam forms rapidly in the absorption tower or when quick defoaming is required. ★Excellent stability and durability: After some time, the salt concentrations in the amine treatment and diol dehydration units will reach their maximum levels. The TSA-7133 desulfurization defoamer remained highly stable under these conditions. Furthermore, to maintain good line control, a lower amount of defoamer should be used, which also helps to reduce costs as well as the likelihood of dirt formation and blockages. Furthermore, since such products tend to disperse in water and are compatible with diols, the water content in the defoamer emulsion is not easily removed due to the presence of diols, thereby allowing the defoamer to remain effective for a longer period of time. ★Excellent high-temperature stability – Due to its excellent dispersing properties, the TSA-7133 desulfurizing defoamer does not deposit on heat exchangers like many other defoamers do. They tend to disperse well in amine or diol solutions, and are finally separated through filtration. ★It is easy to dilute and use – the TSA-7133 desulfurizing defoamer emulsion can be diluted to the desired concentration by simply adding water and stirring slightly. Due to the reduced viscosity after dilution, pumping these diluted emulsions becomes very easy. ★Reduce blockages and fouling thermal resistance in heat exchangers – which can potentially reduce equipment maintenance. ★A low concentration is sufficient to effectively control foam – the effectiveness of TSA-7133 defoaming agent is 2-3 times that of other defoaming agents used in gas treatment units. Reasons for foaming in the desulfurization process: During the operation of the desulfurization unit, certain factors may cause foaming in the slurry inside the absorption tower, leading to overflow of the tower. These factors may include: (1) excessive dust in the incoming flue gas, especially if it contains a large amount of inert substances; (2) poor quality coal, resulting in incomplete combustion in the boiler or the use of oil in the boiler, which causes the incoming flue gas to contain oil. (3) The limestone contains an excessive amount of MgO; this excess not only affects the desulfurization efficiency but also reacts with sulfate ions. (4) An increase in heavy metal ions in the absorption tower slurry leads to an increase in the surface tension of the slurry. (5) Additionally, it is important to ensure that the parameter values of the process water quality in the desulfurization system remain within the designed range; otherwise, it can also lead to bubbles in the absorbent tower slurry.