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I. Category Name

　　Defoamer for Desulfurization, Model XPC-20A

II. In the field of thermal power generation, our company’s XPC‑20A product is used in flue gas desulfurization processes, with the following applications and objectives:

　　At present, most thermal power plants in China employ wet flue‑gas desulfurization. During the operation of the desulfurization system, the following factors can cause foaming of the absorber slurry, leading to overflow from the absorber.

　　1. In the absorption tower, the gas and liquid undergo high-speed counter-current mixing.

　　2. Excessive dust levels in imported flue gas, such as impurities containing large amounts of inert substances.

　　3. Poor coal quality, insufficient combustion in the boiler, or oil firing can result in oily flue gas at the inlet.

　　4. An increase in heavy metal ions in the absorber slurry leads to a rise in the slurry’s surface tension.

　　5. When the limestone contains an excess of MgO, the overabundance of MgO not only reduces desulfurization efficiency but also reacts with sulfate ions.

　　Foam formation in the absorber slurry, caused by the aforementioned factors, leads to substantial losses of neutralizing agents and cooling water, while significantly reducing the reaction rate and product recovery. This severely impacts operational performance and desulfurization efficiency. Moreover, excessive foam overflow contaminates the plant environment and poses significant safety risks to the motor room beneath the cooling tower, resulting in potential electrical losses.

　　When a defoaming agent is applied, the efficiency of cooling water and absorbent utilization within the desulfurization tower can be effectively enhanced, significantly reducing both the frequency and number of circulating pump startups. This leads to a substantial increase in sulfate production while also lowering on-site labor‑intensive maintenance costs, resulting in a marked improvement in overall economic benefits.

　　Since flue‑gas desulfurization in thermal power plants requires a desulfurizing agent—typically limestone or limestone slurry—practical trials and laboratory foam‑testing have shown that conventional defoamers are generally ineffective at suppressing the foam generated in the absorber slurry. Moreover, their performance varies under different foaming conditions; therefore, thorough testing of defoamers is essential to achieve optimal efficacy in specific applications.

III. Application of Defoamers in Seawater Circulating Water Systems

　　In production processes that use seawater as the circulating coolant, the high concentrations of shellfish and marine algae in seawater, combined with favorable ambient temperatures, can lead to rapid biological proliferation and severe pipe blockages. Adding chlorine to the circulating water generates hypochlorous acid, which kills these organisms. However, the decomposition of decaying animal matter in the water, under vigorous agitation, produces copious foam, contributing to marine pollution. Our company’s XPC‑20B product effectively eliminates such foam, enabling efficient settling of pollutants and thereby preventing further marine contamination.

　　The application of defoamers in thermal power plants has effectively reduced environmental pollution.

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