Absorption tower for wet flue gas desulfurization

Abstract

The invention relates to an absorption tower for wet flue gas desulfurization. A limestone-gypsum wet flue gas desulfurization process is adopted in the absorption tower. The absorption tower comprises an oxidizing reaction tank and an absorbing area, wherein a circular oxidizing reaction tank is arranged under the absorption tower; a square absorbing area is arranged above the absorption tower; a slurry spraying pipe and a nozzle connected to the slurry spraying pipe are arranged on the lower part of the absorbing area; the slurry spraying pipe is a concentric reducer pipe; the slurry spraying pipe is connected to the nozzle by a flange; a mounting angle of the nozzle which is connected to the slurry spraying pipe is vertical upwards; the oxidizing reaction tank of the absorption tower is connected to the side wall of the absorbing area in the manner of square inscribed circle or square circumscribed circle; the slurry spraying pipe and a nozzle overhauling manhole door are arranged on a steel wall of the absorption tower in the absorbing area; and a ceramic lining oxidation air pipe which is connected to the bottom of the oxidizing reaction tank is mounted by being inclined for 15-20 degrees in the manner of being high in external port and low in internal port. The absorption tower for wet flue gas desulfurization is simply and conveniently maintained, thereby efficiently lowering the maintenance cost.

Description

technical field [0001] The invention relates to a flue gas desulfurization device, in particular discloses a wet flue gas desulfurization absorption tower, which belongs to the field of atmospheric environmental protection and is suitable for wet flue gas desulfurization in industries such as electric power, chemical industry, and steel. Background technique [0002] Since the reform and opening up, my country's economy has achieved great development, but it has also paid a huge price for environmental pollution. At present, energy conservation and environmental protection are given top priority in the new 12th Five-Year Plan. At the same time, this has brought new opportunities and challenges to the flue gas desulfurization market of thermal power plants in the field of atmospheric environmental protection. [0003] The domestic mainstream wet flue gas desulfurization technology is limestone-gypsum wet flue gas desulfurization technology, in which the desulfurization absorp...

AI Technical Summary

Problems solved by technology

[0007] 1. Since the outlet of the pressure nozzle used in the spray tower usually has a spray angle of about 120°, this causes the nozzle to wash the tower wall for a long time, causing the anti-corrosion layer on the tower wall to fall off, and even the tower wall to be pierced

[0008] 2. Due to the small diameter of the pressure nozzle used in the spray tower, there are inevitably debris in the slurry, especially the fallen anti-corrosion debris, which can easily block the nozzle. After the nozzle is blocked, it cannot be found in time, which directly causes the desulfurization efficiency to drop.

[0009] 3. Because the nozzles used in the spray tower need a certain pressure to atomize the slurry into droplets, so that the contact area between the smoke and the droplets is as large as possible, but because there is always a certain distance between the droplets, the smoke cannot be guaranteed. The 100% contact with the mist droplets makes the desulfurization efficiency unable to stabilize and reach a level above 99%, which limits the use in the case of large flue gas volume and high-sulfur coal

[0011] 1. Since the oxidation reaction tank of the liquid column tower is square, a large amount of debris accumulates at the four angles of the oxidation reaction tank, resulting in a decrease in the volume of the oxidation reaction tank, which affects the normal progress of the oxidation reaction

Insufficient oxidation reaction will cause the content of calcium sulfite in the slurry to exceed the standard, making the fluidity of the slurry worse and causing a decrease in desulfurization efficiency

[0012] 2. The spray pipe of the liquid column tower adopts a straight-through pipe with a constant diameter. Due to the low flow rate of the slurry in the spray pipe, it is easy to deposit debris and cause the spray pipe to be blocked.

Especially in China, a large amount of limestone with low cost and high sand content is used as absorbent, which is more likely to cause blockage of the spray pipe

According to statistics, most of the liquid column towers in operation in China have the problem of blockage of the spray pipe due to the high sand content.

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