Two-stage flue gas desulfurizing tower

Abstract

The invention discloses a two-stage flue gas desulfurizing tower. The two-stage flue gas desulfurizing tower adopts a cylindrical structure, and sequentially comprises a defogging layer, a sprinkling layer, a desulfurizing liquid layer, a gas inlet layer and a liquid accumulating layer from the top to the bottom, wherein the desulfurizing liquid layer is used for primarily desulfurizing flue gas; the sprinkling layer is used for secondarily desulfurizing the flue gas. According to the invention, the desulfurizing liquid layer is separated from the gas inlet layer by a baffle plate; the desulfurizing liquid layer is directly communicated with the sprinkling layer for receiving desulfurizing liquid flowing down from the sprinkling layer, so that the desulfurizing liquid can be avoided from flowing down along the inner wall of the desulfurizing tower to corrode the inner wall; a hollow tube is arranged on the surface of the baffle plate to enable the desulfurizing liquid layer to be communicated with the gas inlet layer; the hollow tube is set to be spiral; a plurality of thin holes are formed in the hollow tube, and the flue gas form small bubbles through the thin holes, so that the contact area of the flue gas and the desulfurizing liquid is increased and thus the desulfurizing effect is enhanced; the gas inlet layer is set into a cylinder with the inside diameters of the two ends larger than the inside diameter of the middle part and a side wall bent at a certain radian, so that the flowing speed of the flue gas is increased and the efficiency of the desulfurizing tower is improved.

Description

Technical field [0001] The invention relates to the field of waste gas purification, and in particular to a two-stage flue gas desulfurization tower. Background technique [0002] The traditional flue gas desulfurization methods are generally divided into: 1. Liquid column desulfurization: the desulfurization liquid is sprayed from the nozzle, and it comes into contact with the flue gas twice during the ascent and falling process, so that the sulfur compounds in the flue gas and the desulfurization liquid Reaction to achieve the desulfurization effect; 2. Spray desulfurization: The nozzle sprays the mist desulfurization liquid against the flue gas to increase the contact area between the flue gas and the desulfurization liquid. The sulfur compounds in the flue gas react with the desulfurization liquid to achieve the desulfurization effect Three, bubbling desulfurization: using a nozzle to pass the flue gas into the desulfurization liquid, the flue gas forms bubbles and contacts t...

AI Technical Summary

Problems solved by technology

[0003] Although there are many ways to realize flue gas desulfurization, there is only one purpose: to maximize the contact area and contact time between flue gas and desulfurization liquid, so that the sulfur compounds in flue gas can fully react with desulfurization liquid

The existing flue gas desulfurization equipment mainly has the following disadvantages: 1. Simply using spraying method for desulfurization, not only the desulfurization is not complete, but also the desulfurization liquid has a large contact area with the desulfurization tower, which is easy to corrode the desulfurization tower; In combination, such as pre-desulfurization treatment before spray desulfurization, although good results are received, the structure of the equipment is complicated and the process flow is complicated

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