Series tower type cement kiln high-sulfur flue gas desulfurization system

Abstract

The invention provides a series tower type cement kiln high-sulfur flue gas desulfurization system. The series tower type cement kiln high-sulfur flue gas desulfurization system comprises two flue gasdesulfurization absorption towers connected in series and two limestone slurry tanks. Each flue gas desulfurization absorption tower sequentially comprises a slurry tank, a flue gas inlet, a sprayingdevice and an exhaust port from bottom to top, wherein the slurry pool is communicated with the spraying device through a circulating pump pipeline, and a gypsum discharge pipeline is arranged at thebottom of the slurry tank. The limestone slurry tanks are communicated with the slurry tanks through pipelines, a demister is arranged on the flue gas desulfurization absorption tower connected in series at the tail end in the flue gas desulfurization absorption towers connected in series, and the demister is arranged between the spraying device and the exhaust port of the flue gas desulfurization absorption tower at the tail end. According to the cement kiln high-sulfur flue gas desulfurization system disclosed by the invention, the ultra-clean emission technology of cement kiln tail high-sulfur flue gas is realized through a series tower technology; compared with a single-tower technology, power consumption is reduced; and the butt joint construction period is shortened in the project of improving the efficiency of the high-sulfur flue gas desulfurization tower, and kiln shutdown is reduced.

Description

technical field [0001] The invention relates to the field of environmental protection equipment, in particular to a high-sulfur flue gas desulfurization system of a series tower cement kiln. Background technique [0002] Sulfur emissions from the cement industry mainly come from the raw materials used for cement production. The initial value of sulfur varies greatly from region to region, and there are regional characteristics. Especially in Guangdong, Guangxi and Southwest regions, the content of pyrite in the raw materials of mines is relatively high, and the initial value of sulfur emitted is as high as 5,000 Left and right, the desulfurization process adopted is mainly limestone gypsum-wet desulfurization process, and the single absorption tower desulfurization system is used to remove SO in the flue gas 2 At the same time, it also needs to consume a large part of energy, such as water, gas, limestone, electricity, etc. The higher the sulfur content, the higher the desul...

AI Technical Summary

Problems solved by technology

However, as the proportion of slurry circulation increases, the greater the liquid-gas ratio, the higher the power consumption

At the same time, in order to overcome the flue gas resistance caused by the high liquid-to-gas ratio, the power consumption of the induced draft fan increases, which causes the power consumption of the single-tower operation to be higher than that of the two-tower series operation

In summary, the existing technology is difficult to meet the ultra-clean emission of ultra-high-sulfur flue gas desulfurization; and in the case of obtaining the same high-efficiency desulfurization efficiency, the treatment of high-sulfur flue gas requires higher power consumption, which is not energy-saving.

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