Antifoaming agent for flue gas desulphurization system and preparing method thereof

Abstract

The invention discloses an antifoaming agent for a flue gas desulphurization system. The antifoaming agent is prepared from, by mass, 30%-60% of antifoaming components, 10%-20% of foam inhibition components, 5%-10% of an emulsion stabilizer, 5%-10% of a synergist and the balance deionized water. The antifoaming agent is suitable for a thermal-power-plant limestone-gypsum wet flue gas desulfurization system adapting to high chlorine, fluorion and solid-content slurry liquid and aeration, and has the advantages of being good in antifoaming effect and long in foam inhibition time; the foaming characteristic of desulfuration slurry liquid can be improved, the stability of a slurry-liquid oxidation zone is effectively controlled, the foam content of the slurry liquid is reduced, losses of the slurry liquid of a circulating pump are reduced, the circulation amount of the slurry liquid is increased, and it is avoided that foam overflows to a pipe zone, the slurry liquid is deposited in a pipe, and scale formation corrosion is caused.

Description

technical field [0001] The invention relates to a chemical auxiliary agent, in particular to a desulfurization defoamer used in a limestone-gypsum wet flue gas desulfurization system of a thermal power plant. Background technique [0002] my country is a large coal producing country, and the energy structure determines that my country's market structure is dominated by thermal power generation. Taking 2014 as an example, my country's coal production reached 3.87 billion tons, nearly half of the world's output; in the same year, my country's thermal power generation was 398 billion kWh, accounting for more than 70% of the country's coal consumption, and it is the main source of air pollution. Among them, the emission of sulfur dioxide in flue gas accounts for more than 90% of the total emission of sulfur dioxide in the country, and the total emission in 2014 reached 19.744 million tons. [0003] Sulfur dioxide is extremely harmful to the environment, causing acid rain and ac...

AI Technical Summary

Problems solved by technology

[0003] Sulfur dioxide is extremely harmful to the environment, causing acid rain and acid fog, corrosive to the environment, and carcinogenic to the human body

However, in the actual operation of the power plant, there are also many unstable factors such as large fluctuations in coal quality, uneven coal types, and fluctuations in boiler power generation loads, which greatly interfere with the operation of the desulfurization tower.

[0005] Due to fluctuations in operation, the desulfurization tower slurry will generate a large amount of foam in the slurry pool, which will affect the measurement of the liquid level and directly reduce the actual volume of the effective oxidation zone of the slurry, and excessive foam will cause overflow and affect the power of the circulating pump, reducing Circulation volume

[0006] Existing defoamers have problems such as low efficiency, inapplicability to high-solid slurry, and inconvenient dosing, and cannot be applied to flue gas desulfurization systems with high chlorine and fluoride ions