Two-stage absorption differential desulfurizing tower

Abstract

The invention discloses a two-stage absorption differential desulfurizing tower. The two-stage absorption differential desulfurizing tower comprises a tower body (10), wherein an inlet flue (1) and an outlet flue (2) are oppositely formed in the side wall of the tower body (10); a concentrated phase absorption region (3) is formed on the part, adjacent to the inlet flue (1), in the tower body (10); a dilute phase absorption region (4) is formed on the part, adjacent to the outlet flue (2), of the tower body (10); a compact spraying layer is arranged in the concentrated phase absorption region (3); a sparse spraying layer is arranged in the dilute phase absorption region (4); sulfur-containing flue gas (a) sequentially passes through the concentrated phase absorption region (3) and the dilute phase absorption region (4); the flow speed of the sulfur-containing flue gas (a) in the concentrated phase absorption region (3) is higher than that of the sulfur-containing flue gas (a) in the dilute phase absorption region (4). The two-stage absorption differential desulfurizing tower adopts the concentrated phase absorption region and the dilute phase absorption region and adopts a differential design, so that the flue gas is returned by a partition plate, the retention time of the flue gas in an absorption tower is prolonged, and the absorption efficiency of sulfur dioxide (SO2) is improved.

Description

technical field [0001] The invention relates to a desulfurization tower, in particular to a two-stage absorption differential speed desulfurization tower which belongs to the field of environmental protection and can be used in electric power, cement, metallurgy, chemical industry and other industries. Background technique [0002] At present, most of the existing desulfurization devices adopt the configuration of one furnace and one tower, which is suitable for flue gas desulfurization of units of different capacities. For extra-large units of 600MW and above, when the sulfur content of the flue gas at the inlet of the desulfurization device exceeds 8000mg / N m 3 , and require the sulfur content of the flue gas at the outlet of the desulfurization unit to be less than 200mg / N m 3 , when the desulfurization efficiency is greater than or equal to 97.5%, most of the current designs use liquid-gas ratios exceeding 5l / m 3 Empirical design values ​​for single-layer spraying. ...

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Problems solved by technology

[0003] Although this solution can reduce the number of spray layers in the absorption tower, the number of nozzles in a single spray layer is too large, and the spray density is too high, which will affect the SO in the entire absorption tower. 2 Absorption efficiency; secondly, a single slurry circulation pump has a large capacity, exceeding 12000m 3 / h, although this problem can be solved by using two slurry circulation pumps in a single spray layer to supply slurry, but the dual pumps occupy a large area and are difficult to arrange. At the same time, the failure rate of super large capacity slurry circulation pumps is high The outage of each slurry circulating pump will have a great impact on the desulfurization efficiency; finally, due to the high liquid level in the slurry pool and many spray layers in the absorption tower, the total height of the absorption tower is high and the cost is high

[0004] At the same time, for the inlet sulfur content is not high, the outlet sulfur content is less than 50mg / Nm 3 , but for units with a desulfurization efficiency greater than 98.5%, it is difficult to achieve high desulfurization efficiency with a single unit and a single absorption zone.

This scheme not only covers a large area, but also requires a large amount of engineering and high cost

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