Desulfurization defoamers in power plants are different from other defoaming environments. Because the slurry components of desulfurization and water treatment wastewater components are not the same. Most coal-fired power plants in China burn coal. Desulfurization foaming not only increases the workload and brings trouble to the operation, but also pollutes the working environment, so it is necessary to use a professional desulfurization defoamer. However, due to the current thermal power plant flue gas desulfurization to use desulfurizer, and desulfurizer is alcohol, after practice and laboratory test foam data obtained from the general ordinary silicone defoamer desulfurization device absorption tower slurry foam defoaming effect is unknown (adding amount will affect PH, too large PH will continue to be low, affecting the desulfurization rate) so should choose by special organic compounds, related catalysts and glycerol and other polymerization of the defoamer.