Wet flue gas desulfurization synergist and application method thereof

Abstract

The invention relates to a wet flue gas desulfurization synergist and an application method thereof. The gas desulfurization synergist is prepared from the following components in percentage by mass: 70 to 86 percent of caproic acid, 3 to 11 percent of magnesium sulfate, 2 to 24 percent of sodium carbonate, 1 to 8 percent of copper sulfate, 1 to 8 percent of manganese chloride, and 1 to 4 percent of polysiloxane. The application method of the wet flue gas desulfurization synergist comprises the following step of at normal temperature and pressure, adding the wet flue gas desulfurization synergist into a limestone slurry, wherein the addition amount of the wet flue gas desulfurization synergist is ranged from 300 to 800mg / L. Compared with the prior art, according to the wet flue gas desulfurization synergist and the application method thereof provided by the invention, the limestone activity can be improved, the SO2 gas-liquid migration speed is accelerated, the conversion speed from CaCO3 to CaSO4 is improved, the use ratio of the CaCO3 is improved, and the use amount of limestone is reduced; and with the synergist, the pH value buffer ability of the limestone slurry can be improved, the quick reduction of a pH value of a desulfurization slurry in a process of continuously absorbing SO2 is slowed down, and the absorption of the SO2 is benefited.

Description

[0001] [technical field] [0002] The invention relates to the technical field of flue gas desulfurization, in particular to a synergist for flue gas wet desulfurization and its application method. [0003] [Background technique] [0004] Among the many flue gas desulfurization technologies, wet flue gas desulfurization has always occupied a dominant position. At present, among the desulfurization devices that have been built in the world, wet desulfurization devices account for about 80%. The cost is high and the equipment is easy to scale and block. Due to the low solubility of limestone in some desulfurization devices, the mass transfer efficiency is affected. As a result, the designed liquid-gas ratio of the desulfurization system is generally high, and the Ca / S in actual operation is generally high, which increases the investment and operating energy consumption of the system, and also reduces This reduces the utilization rate of limestone and increases the desulfurizatio...

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Problems solved by technology

[0004] Among the many flue gas desulfurization technologies, wet flue gas desulfurization has always occupied a dominant position. At present, among the desulfurization devices that have been built in the world, wet desulfurization devices account for about 80%. High cost and easy fouling and blockage of equipment

Due to the low solubility of limestone in some desulfurization devices, the mass transfer efficiency is affected. As a result, the designed liquid-gas ratio of the desulfurization system is generally high, and the Ca / S in actual operation is generally high, which increases the system investment and operating energy consumption, and also reduces The utilization rate of limestone is increased, and the desulfurization cost of the power plant is increased; and the system is unstable. Once the limestone slurry supply system fails, the desulfurization rate drops rapidly after the desulfurization system enters the low pH section, which seriously affects the discharge of environmental protection standards.

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