Wet desulphurization mechanism

Abstract

The invention discloses a wet desulphurization mechanism. The wet desulphurization mechanism comprises an original smoke deflector and a smoke heat exchanger, wherein an original smoke opening is formed in the smoke heat exchanger, the cross section of the original smoke opening is rectangular, the original smoke deflector comprises a first elbow and a second elbow, the cross sections of the first elbow and the second elbow are round, and both the first elbow and the second elbow are mounted on the original smoke opening of the smoke heat exchanger. As the first elbow and the second elbow, of which the cross sections are round, are arranged at the original smoke opening of the smoke heat exchanger, smoke can be shunt by the first elbow and the second elbow before entering the smoke heat exchanger, and sufficient bending spaces are available at the first elbow and the second elbow. Besides, the first elbow and the second elbow have smaller round cross sections and great deflecting functions, the whole flow field becomes more uniform, the heat exchange efficiency of the smoke heat exchanger is effectively improved, and the risks that the easily torn deflector plate designed in the traditional rectangular runner causes corroded cracks, corroded flues, runner blocking shutdown and the like are eliminated.

Description

technical field [0001] The invention relates to the technical field of thermal power generation, in particular to a wet desulfurization mechanism. Background technique [0002] In the desulfurization system of a thermal power plant, the desulfurization GGH (flue gas heat exchanger) equipment is an important equipment for wet desulfurization. It uses the original flue gas to heat the desulfurized net flue gas so that the exhaust gas temperature reaches the dew point. On the one hand, reduce the corrosion of the clean flue and chimney, reduce the temperature of the flue gas entering the absorption tower, and reduce the role of the anti-corrosion process technology requirements in the tower. The installation height of the GGH equipment should not be too high. Therefore, in order to meet the According to the layout requirements, the smoke duct often needs to make a sharp turn along the long side of the GGH. The traditional smoke duct usually uses a rectangular diversion elbow th...

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Problems solved by technology

[0002] In the desulfurization system of a thermal power plant, the desulfurization GGH (flue gas heat exchanger) equipment is an important equipment for wet desulfurization. It uses the original flue gas to heat the desulfurized net flue gas so that the exhaust gas temperature reaches the dew point. On the one hand, reduce the corrosion of the clean flue and chimney, reduce the temperature of the flue gas entering the absorption tower, and reduce the role of the anti-corrosion process technology requirements in the tower. The installation height of the GGH equipment should not be too high. Therefore, in order to meet the According to the layout requirements, the smoke duct often needs to make a sharp turn along the long side of the GGH. The traditional smoke duct usually uses a rectangular diversion elbow that matches the GGH, such as figure 1 , figure 2 As shown, the cross-sectional aspect ratio of this type of rectangular diversion elbow 10 that turns sharply along the long side of the GGH is greater than or equal to 2, and the bending radius of the elbow is small, usually about half of the long side of the GGH, which has the following problems: 1. Flow field: When the elbow turns at 90° along the long side of the GGH, the sideways phenomenon of the flue gas is very serious, which seriously affects the heat transfer efficiency of the GGH. In order to make the flow field relatively uniform and not affect the heat transfer efficiency of the desulfurization GGH, usually There is a deflector inside the body, but after a period of operation, the deflector inside the duct is torn off repeatedly by the flue gas, and it is easy to tear and fall off, causing cracks in the flue anti-corrosion, causing flue corrosion, and blocking the flow path in severe cases , causing the unit to shut down, which seriously affects the safe and reliable operation of the unit; 2. Consumables: the consumables of the flat and wide rectangular elbow are huge, and the setting and installation of reinforcement ribs are relatively complicated; 3. Resistance: the resistance is calculated by using the FLUENT fluid simulation software. The resistance of the quasi-rectangular elbow arrangement is relatively large, about 100Pa, and the fan consumes a lot of power to overcome this resistance.

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