Spiral dedusting demister, demisting device and absorption tower

Abstract

The invention discloses a spiral dedusting demister, a demisting device and an absorption tower. The spiral dedusting demister comprises a barrel, and a hollow cavity which is used for allowing flue gas to pass through and has two communicated ends is formed in the barrel. An inner spiral part is detachably connected into the hollow cavity. An outer spiral part is detachably connected into the inner spiral part. Meanwhile, the spiral path of the inner spiral part is different from that of the outer spiral part. The spiral dedusting demister is arranged to be a barrel with the two ends communicated, the inner wall face of the barrel is detachably connected with an internal thread part, and an external thread part is arranged in the internal thread part. Smoke enters the hollow cavity of thebarrel; the smoke enters the external thread part and forms high-speed centrifugal force, so that fog drops and dust contained in the smoke expand outwards, are separated from the smoke, enter threads of the internal thread part, are blocked by the threads of the internal thread part and flow down along the threads, the dust and the fog drops are prevented from being carried for the second time,and the effect of improving the dedusting and demisting performance is achieved.

Description

technical field [0001] The invention belongs to the technical field of flue gas absorption towers, and in particular relates to a spiral dust and mist eliminator, a mist removal device and an absorption tower. Background technique [0002] The demister is an important part of the desulfurization absorption tower. The demister is installed above the absorption tower, and its main function is to separate the entrained liquid droplets and slurry in the flue gas, so as to prevent the mist droplets from entering the chimney and being discharged into the atmosphere. Its working mechanism is: the mist carried by the flue gas passes through the demister at a certain speed. Due to the inertia, the mist hits the blades of the demister and is trapped. When more and more mist is collected , falls down after reaching a certain weight, and enters the desulfurization tower again. [0003] Traditional baffle demisters include flat plate demisters and roof ridge demisters, and the particle...

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Problems solved by technology

[0003] Traditional baffle demisters include flat plate demisters and roof ridge demisters, and the particle size of the removed mist is above 15 μm; baffle demisters are prone to fouling and clogging. In actual operation, in order to ensure that the equipment Normal operation requires regular flushing, resulting in a large amount of wastewater in the desulfurization system

At the same time, the traditional baffle plate demister has limited dust removal effect. If there is no dust removal device such as wet electrostatic precipitator at the back end of desulfurization, it is difficult to ensure that the dust concentration at the outlet of the absorption tower is lower than 20mg / Nm3, let alone achieve a super high level of 5mg / Nm3. low emission

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