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Wet desulfurization tower based flue gas desulphurization method capable of enhancing adaptability to low load

A technology for wet desulfurization and desulfurization tower, applied in the field of flue gas desulfurization, can solve the problems of unmaintainable mist removal efficiency of mist eliminators, sedimentation of fly ash and droplets at the entrance and exit of towers, and reduced desulfurization efficiency, so as to enhance low-load adaptation. High performance, operation safety and reliability, ensuring the effect of safe operation

Inactive Publication Date: 2010-05-12
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a flue gas desulfurization method based on a wet desulfurization tower with enhanced low-load adaptability to solve the problem of demister removal in the desulfurization tower when the load of the desulfurization tower is lower than 30% of the rated load. The mist efficiency cannot be maintained, the desulfurization efficiency is reduced, and the problem of fly ash and droplet settlement at the entrance and exit of the tower

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  • Wet desulfurization tower based flue gas desulphurization method capable of enhancing adaptability to low load

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specific Embodiment approach 1

[0012] Specific implementation mode one: as figure 1 and figure 2 As shown, the flue gas desulfurization method based on the wet desulfurization tower with enhanced low-load adaptability described in this embodiment is carried out using a wet desulfurization tower, and the flue gas desulfurization method is implemented according to the following steps: Step 1. Calcium-based slurry is added to the desulfurization tower body 9, which contains 5-8% (mass) gypsum seed crystals, and an air pipe 8 is set in the bottom of the desulfurization tower to provide CaSO 3 Oxygen required for oxidation (CaSO 3 from the SO in the flue gas 2 with CaCO in calcium-based slurry 3 or Ca(OH) 2 generated by the reaction), an agitator 7 is set on the side wall of the desulfurization tower body 9 to stir the calcium-based slurry;

[0013] Step 2: Send the flue gas to be treated into the cavity between the calcium-based slurry liquid level in the desulfurization tower body 9 and the spray layer 1...

specific Embodiment approach 2

[0015] Specific implementation mode two: as figure 1 As shown, the present embodiment uses the negative pressure at the entrance of the desulfurization tower body 9 produced by the induced draft fan 14 to automatically draw back part of the flue gas at the outlet of the induced draft fan 14 in step three of the specific implementation mode, and the flue gas from the flue gas inlet pipe 13 The flue gas to be treated is mixed to form mixed flue gas and flows into the desulfurization tower body 9 together; the desulfurized flue gas in the upper part of the desulfurization tower body 9 is extracted; An induced draft fan 14 is installed on the main pipe 16, so that part of the desulfurized flue gas is discharged from the flue gas discharge pipe 2, and another part flows into the desulfurization tower body 9 from the circulating flue gas pipe 4 through the desulfurization tower inlet 6. Other steps are the same as in the first embodiment.

[0016] Such as figure 1 , when the load ...

specific Embodiment approach 3

[0017] Specific implementation mode three: as figure 2 As shown, in this embodiment, in the third step of the specific embodiment, the desulfurization booster fan 5 is used to blow the mixed flue gas into the desulfurization tower body 9; A desulfurization booster blower 5 is installed on the main inlet pipe 15 so that the flue gas to be treated and the desulfurized flue gas are blown into the desulfurization tower body 9 through the desulfurization booster fan 5 . Other steps are the same as in the first embodiment.

[0018] Such as figure 2 , when the load of the desulfurization system is greater than 30% of the rated load, the load in the desulfurization tower meets the adaptability requirements at this time, and the original flue gas from the outlet of the desulfurization booster fan 5 enters the desulfurization tower 9, and is pumped by the circulating slurry pump 10 to the spray layer 11 The atomized desulfurization slurry is in countercurrent contact, and the net fl...

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Abstract

The invention relates to a wet desulfurization tower based flue gas desulphurization method capable of enhancing the adaptability to low load, solving the problems as follows: when the load of the desulfurization tower is lowered (the load is lower than 30% of the amount of flue gas under rated load of the desulfurization tower), the amount of the flue gas flowing through the desulfurization tower is lessened; therefore, the demisting efficiency of a demister can not be maintained, the desulfurization efficiency is reduced and fly ash and liquid drops at the entrance and exit of the tower settle. The method mainly comprises the following steps: exhausting the flue gas desulfurized in the desulfurization tower after being demisted; and separating partial purified flue gas from all the purified flue gas under automatic regulation of a circulatory flue gas regulator when the load of a desulfurization system is lower than 30% of the rated load, and ensuring the partial purified flue gas to return back to the entrance of the desulfurization tower via a circulatory flue gas pipe, thus accelerating the air speed in the tower and ensuring the flue gas load in the desulfurization tower at the lower limit of at least 30% of the rated load under which the desulfurization tower can operate stably. The method enables the wet desulfurization tower to safely and stably operate under the condition of meeting 0%-110% of rated load and obviously enhances the adaptability of the desulfurization system to low load.

Description

technical field [0001] The invention relates to a flue gas desulfurization method, in particular to a flue gas desulfurization method based on a wet desulfurization tower with enhanced low-load adaptability, belonging to the field of industrial waste gas purification and environmental protection. Background technique [0002] Wet flue gas desulfurization is currently the most widely used and most effective desulfurization process in the world. However, the wet desulfurization tower has certain load adaptability. Generally, it can operate stably at 30% to 110% of the rated load of the desulfurization tower. When the load is lower than 30 When the desulfurization tower is under the rated load, a series of problems will be caused: (1) Inertial separation demisters are generally used in the desulfurization tower. and centrifugal force decrease, the separation efficiency decreases, that is, the demisting effect is significantly weakened, causing the flue gas channel and equipment...

Claims

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Application Information

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IPC IPC(8): B01D53/80B01D53/50
Inventor 杜谦高继慧高建民刘辉王建峰赵昊阳明磊凌吴少华秦裕琨
Owner HARBIN INST OF TECH
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