A limestone wet flue gas desulfurization additive and its preparation method

Abstract

The invention discloses a limestone wet flue gas desulfurization additive. The limestone wet flue gas desulfurization additive comprises the following raw materials in parts by weight: 60-70 parts of adipic acid, 5-10 parts of sodium citrate, 5-10 parts of sodium benzoate, 2-3 parts of lanthanum nitrate, 5-10 parts of sodium acetate, 5-10 parts of magnesium oxide and 3-5 parts of magnesium sulfate. The method comprises the following steps: adding water, and respectively heating the raw materials in a water bath until all components are dissolved; mixing the water solutions to obtain a composite solution; heating the composite solution in the water bath, and cooling the composite solution to room temperature to obtain a desulfurizing agent through a vacuum freeze-drying technology. According to the desulfurization additive, an existing coal-fired flue gas desulfurization device does not need to be modified, an effect of remarkably desulfurizing coal gas with the sulfur content of 2,000-14,000mg / Nm<3>, particularly high-sulfur coal gas with the sulfur content of 4,000-14,000mg / Nm<3> is achieved, the limestone utilization rate and the desulfurization efficiency are improved, the quality of byproduct gypsum is improved, and the limestone wet flue gas desulfurization additive has the advantages of remarkable effects of preventing a desulfurization system from scale formation, reducing the energy consumption and improving coal type adaptability.

Description

technical field [0001] The invention relates to a wet desulfurization process, in particular to a limestone wet flue gas desulfurization additive and a preparation method thereof, belonging to the field of chemical industry. Background technique [0002] Wet flue gas desulfurization technology (FGD for short) is currently the most widely used desulfurization process in China with the highest desulfurization efficiency and the most stable operation. %above. However, due to the implementation of the new national desulfurization emission standards and the strict requirements for emissions in key areas, the design indicators of the original equipment are far from meeting the requirements of the current emission standards; at the same time, with the extension of the operating time, the performance of the equipment has declined , there will inevitably be a decrease in desulfurization efficiency and fouling of desulfurization devices; in addition, for the sake of economic efficien...

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Problems solved by technology

At present, among the existing desulfurization additives, the desulfurization efficiency can be significantly improved; however, the existing desulfurization additives only aim at sulfur content of 1000–3000 mg / Nm 3 (CN 103055690A, CN103386248A, CN102419359) coal-fired flue gas has a significant desulfurization effect; The sulfur content in the coal flue gas far exceeds 3000mg / Nm 3 , even up to 10000 mg / Nm 3 As mentioned above, the existing desulfurization additives can no longer meet the new national emission standards. Therefore, there is an urgent need for a desulfurization additive that can be applied to flue gas wet desulfurization devices with high coal sulfur content

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