A desulfurization additive suitable for limestone-gypsum wet flue gas desulfurization technology

Abstract

The invention discloses a desulfurization additive applicable to a limestone-gypsum wet-method flue gas desulfurization technique. The desulfurization additive is prepared from the following raw materials in parts by weight: 60 to 70 parts of mixed organic acid, 10 to 20 parts of loss inhibitor, 0 to 1 part of mercury stabilizer, 20 to 30 parts of oxidation catalyst and 5 to 15 parts of antifoaming agent, wherein the mixed organic acid is a mixture of adipic acid, succinic acid and glutaric acid; the weight ratio of the adipic acid to the succinic acid to the glutaric acid is 26 to 35 to 39; the oxidation catalyst is a mixture of manganese sulfate and iron sulfate; the weight ratio of the manganese sulfate to the iron sulfate is 3 to 4. The desulfurization efficiency and the utilization rate of limestone can be improved through the use of the desulfurization additive; further, the loss of the desulfurization additive and the emission concentration of the mercury can be reduced. In the same condition, after the additive provided by the invention is added into a desulfurization system, the time of maintaining that the desulfurization efficiency reaches 90 percent is prolonged; improvement of the utilization rate of the limestone is shown.

Description

technical field [0001] The invention belongs to the technical field of flue gas treatment, and in particular relates to a desulfurization additive suitable for limestone-gypsum wet flue gas desulfurization technology. Background technique [0002] Coal is the main energy source in my country. By the end of 2015, the installed capacity of thermal power in the country reached 1,005.54 million kilowatts, accounting for 65.9% of the total installed capacity of power generation, and the total power generation was 4,230.7 billion kwh, accounting for 73.7% of the total power generation. For a long period of time in the future, my country's power supply pattern dominated by coal-fired power generation will not change fundamentally. [0003] A large amount of pollutants will be emitted in the process of coal-fired power generation. According to statistics, in 2014, SO 2 Emissions accounted for 34.61% of the total annual emissions, NOx emissions accounted for 37.69% of the total annu...

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Problems solved by technology

[0005] At present, my country's coal-fired power plants SO 2 The current treatment technology is mainly limestone-gypsum wet desulfurization. Under the background of ultra-low emissions, the original equipment cannot meet the emission standards, and relevant efficiency improvement reforms are required.

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