Double return route absorption tower and method for treating fluorine contained tail gas using double return route absorption tower

Abstract

The invention relates to a double circuit absorption tower and a method for treating tail gas with fluoride via the double circuit absorption tower. The smoke with fluoride enters a first absorption zone of the absorption tower, then enters a secondary absorption zone for a second time purification via a gas cylinder after being cooled and purified and is discharged into the atmosphere via a chimney arranged at the top of the absorption tower after the mist is removed. The lower section of the tower body is a secondary serum recirculating tank; the middle section is the first absorption zone; the lower part of the middle section is a first-level serum recirculating tank; a spraying device is arranged at the upper part of the first absorption zone; a baffle with the gas cylinder is a secondary absorption zone at the upper section of the tower body; the upper part is provided with the spraying device, a demister and a cleaning device; the chimney is arranged at the top of the absorption tower. The tower combines the original two towers into an absorption tower through arranging an upper and a lower baffle, which similarly realizes the high absorption rate of the two towers; the slaking process of limestone or lime is realized in the serum recirculating tank at the bottom of the tower, which reduces the equipment and saves the investment; at the same time, through controlling the pH value of an absorption serum, the absorption rate of the fluoride is raised on the basis of saving the limestone or the lime.

Description

technical field [0001] The invention relates to a method for treating fluorine-containing tail gas and a double-circuit absorption tower for defluorination, which can be used for defluorination of fluoride-containing tail gas produced in industries such as metallurgy and chemical industry; A method for treating fluorine-containing tail gas. Background technique [0002] Fluorine-containing gases such as hydrogen fluoride and silicon tetrafluoride are very harmful to the human body and the environment. The harm of fluorine is mainly manifested as the impact on agriculture and animal husbandry and the impact on people: the concentration of fluorine that harms plants is only equivalent to 1% of sulfur dioxide. However, the sensitivity of plants to fluorine varies greatly. After plants absorb and accumulate fluorine, the tips and edges of leaves will wither and wilt. Among domestic animals, cattle are the most sensitive to fluoride. Severe fluorosis can cause bone damage and de...

AI Technical Summary

Problems solved by technology

Generally, the wet treatment of fluorine-containing tail gas must go through multi-tower and multi-stage absorption, which requires large investment, large land occupation, complex process and high energy consumption.

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