White mud/ carbide slag-gypsum wet flue gas desulfurization device and method

Abstract

The invention discloses a white mud / carbide slag-gypsum wet flue gas desulfurization device and a white mud / carbide slag-gypsum wet flue gas desulfurization method. The device comprises an absorption tower; the top and the middle part of the absorption tower are respectively provided with a flue gas outlet and a first flue gas inlet; a demister, a spraying device, a spraying chamber and a tower kettle are sequentially arranged in the absorption tower from top to bottom; the tower kettle is divided into a slurry chamber and a bubbling chamber by a side wall which is arranged in the tower kettle and is perpendicular to the tower bottom; the bubbling chamber is externally connected with a gypsum pump; a stirrer, an oxidation air pipe and a plurality of bubbling pipes are arranged in the bubbling chamber; the wall of the absorption tower is provided with a second flue gas inlet communicated with the bubbling pipes; and the side wall is provided with an overflow port communicated with the slurry chamber. According to the device and the method, the absorption tower is designed according to the property of white mud / carbide slag, spraying desulfurization is implemented in the spraying chamber, and bubbling oxidation of desulfurized slurry is implemented in the bubbling chamber, so that the spraying desulfurization and the bubbling oxidation are implemented separately in the absorption tower, the desulfurization efficiency and the quality of gypsum are ensured, equipment is simplified, and the cost is reduced.

Description

technical field [0001] The invention relates to the technical field of flue gas desulfurization, in particular to a device and method for wet flue gas desulfurization of white mud / carbide slag-gypsum. Background technique [0002] At present, the main forms of equipment for removing sulfur dioxide from flue gas by wet method are: empty tower spray, tray, packed tower, bubbling tower, etc. The empty tower spray tower has a simple structure and is not easy to produce fouling, but the desulfurization efficiency of the device is high. Lower; the desulfurization efficiency of the bubbling tower is higher, but if water spray is used to cool the flue gas, it will cause the water balance of the system to be unbalanced, and if the slurry spray is used to cool the flue gas, it will lead to more serious scaling and blockage. At present, there have been a lot of reports on the devices and processes using various forms of combined desulfurization. [0003] The Chinese invention patent a...

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Problems solved by technology

[0008] Although the above two methods are desulfurization devices designed for the characteristics of lime mud / calcium carbide slag, and effectively improve the quality of desulfurization gypsum under the premise of ensuring desulfurization efficiency, auxiliary equipment is added outside the tower, which occupies a large area and costs high , which is not conducive to the cost control of enterprises

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