Foam collecting and crushing device of wet flue gas desulfurization system of coal-fired power station

Abstract

The invention relates to a foam collecting and crushing device of a wet flue gas desulfurization system of a coal-fired power station. The foam collecting and crushing device of the wet flue gas desulfurization system of the coal-fired power station comprises an overflow pipe, a foam crushing cover, an exhaust cap, a liquid level sensor and nozzles, wherein the overflow pipe communicates with a desulfurization absorption tower of the coal-fired power station; the foam crushing cover communicates with a discharging opening of the upper end of the overflow pipe; the nozzles are uniformly arranged on the circumference of the inner wall of the foam crushing cover at the same height in the radial direction; the exhaust cap is arranged at the top end of the foam crushing cover; and the liquid level sensor is arranged at the bottom of the foam crushing cover. The foam collecting and crushing device of the wet flue gas desulfurization system of the coal-fired power station has the beneficial effects that foam formed by a wet desulphurization system is effectively eliminated, the problem of foam of an absorption tower is solved by a physical method, the quality of slurry is not changed, andthe quality of byproduct gypsum is not reduced; and the device is simple in structure and convenient to manufacture, install and overhaul.

Description

technical field [0001] The invention belongs to the technical field of environmental protection of thermal power plants, and in particular relates to a foam collection and crushing device for a wet flue gas desulfurization system of a coal-fired power station. Background technique [0002] Coal is used as a primary energy source, SO produced during combustion 2 It is one of the important air pollutants, so a large number of limestone-gypsum wet flue gas desulfurization facilities have been built. [0003] The flue gas treated by the wet desulfurization device contains complex substances such as acid-insoluble substances. During the full contact between the flue gas and the slurry, the gas-liquid interface formed by the flue gas and the slurry forms spherical bubbles under the action of huge surface tension; A large number of bubbles rise rapidly to the surface of the slurry pool under the action of the gas-liquid density difference, forming a layer of foam. [0004] Statis...

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Problems solved by technology

[0004] Statistics show that the more foam there is, the more obvious the enrichment phenomenon of the substance that enhances the surface tension in the absorption tower will be, the greater the surface tension of the bubbles will be, and the increase of the surface tension will inevitably make the bubbles not easy to break, and then cause the foam layer on the surface of the slurry pool to increase. Thick, serious false liquid level appears, which is not conducive to the operation control of the wet desulfurization device system, and also affects the absorption of sulfur dioxide to a certain extent, which is not conducive to the full utilization of limestone. Some power plants are forced to use low liquid level due to false liquid level running, the output pressure of the circulating slurry pump cannot reach the standard, the spraying effect of the nozzle becomes poor, the desulfurization efficiency decreases, and causes environmental protection hazards

[0005] The elimination of desulfurization slurry foam is a long-standing problem in the wet desulfurization system. The existing method uses a chemical method, that is, adding a defoamer to the absorption tower slurry, but the quality of the slurry is changed, and the quality of the by-product gypsum is affected to a certain extent. influences

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