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Double-groove wet-process flue gas desulfuration device and method operating on basis of two pH values

A wet flue gas desulfurization and desulfurization device technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve the problems of complex dual-circulation loop system, increased internal components of absorption towers, increased investment, etc. Operational safety and stability issues, strong load adaptability, and the effect of improving quality

Inactive Publication Date: 2011-06-15
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, in order to meet the dual pH value operation, the above-mentioned patents adopt a complex dual circulation loop system, increase the internal components of the absorption tower, and increase the investment

Method used

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  • Double-groove wet-process flue gas desulfuration device and method operating on basis of two pH values
  • Double-groove wet-process flue gas desulfuration device and method operating on basis of two pH values
  • Double-groove wet-process flue gas desulfuration device and method operating on basis of two pH values

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specific Embodiment approach 1

[0019] Specific implementation mode one: as figure 1 As shown, the double-slot wet flue gas desulfurization device based on dual-pH operation described in this embodiment includes an absorption tower body 15, a mist eliminator 2, a spray layer 3 and a circulation pump 13, the mist eliminator 2, spray The shower layer 3 is arranged in the upper part of the absorption tower body 15 from top to bottom. The lower end side wall of the absorption tower body 15 is provided with a raw flue gas inlet 4, and the upper end side wall of the absorption tower body 15 is provided with a clean flue gas outlet 1. It is characterized in that: the desulfurization device also includes an oxidation tank 6, a circulation tank 10 and a circulating slurry return pipe 14, the oxidation tank 6 and the circulation tank 10 are arranged below the absorption tower body 15, and the upper end of the oxidation tank 6 and the circulation The upper end of the tank 10 is connected; the absorption tower body 15 i...

specific Embodiment approach 2

[0022] Specific implementation mode two: as figure 1 As shown, the oxidation tank 6 and the circulation tank 10 in this embodiment are composed of a cuboid pool body 17 and a partition 11 arranged in the cuboid pool body 17, and the partition plate 11 divides the inner cavity of the cuboid pool body 17 along the Its length direction is divided into two parts used as the oxidation tank 6 and the circulation tank 10, and the height of the partition plate 11 is lower than the height of the cuboid pool body 17, so that the oxidation tank 6 and the circulation tank 10 are communicated. The cuboid design is adopted, and a top-entry agitator is designed on the top of each pool, which reduces the failure points that are prone to failure of the side-entry agitator of the conventional absorption tower. A partition 11 is set between the circulation tank 10 (circulation tank) and the oxidation tank 6 (oxidation tank), and the fully oxidized slurry of calcium sulfite contained in the desul...

specific Embodiment approach 3

[0023] Specific implementation mode three: as figure 1 As shown, the desulfurization device in this embodiment also includes two top-entry agitators 5, one top-entry agitator 5 is respectively arranged in the oxidation tank 6 and the circulation tank 10; the outlet of the circulating slurry return pipe 14 is It is installed below the liquid level of the oxidation tank 6 and above the jacking agitator 5 . Other components and connections are the same as those in the first embodiment.

[0024] Specific implementation mode four: as figure 1 As shown, the desulfurization device in this embodiment further includes a conical funnel 16, which is arranged in the lower part of the absorption tower body 15, and the liquid outlet of the conical funnel 16 is connected to the circulating slurry return pipe 14. Other compositions and connections are the same as those in the first, second or third embodiment.

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Abstract

The invention discloses a double-groove wet-process flue gas desulfuration device and a double-groove wet-process flue gas desulfuration method operating on the basis of two pH values, which relate to a flue gas desulfuration device and a flue gas desulfuration method. The aim of the invention is to remove SO2 from the flue gas under a high pH value condition by using desulfurating spray slurry and to dissolve limestone and oxidize calcium sulfite under a low pH value condition so as to improve desulfuration efficiency and quality of gypsum and reduce limestone consumption, investment and operation cost. In the invention, a circulating oxidization tank at the bottom of an absorption tower is divided into two parts, an oxidation pond receives desulfurizating slurry flowing out from a desulfurization tower, the oxidation pond operates in a pH range from 4.0 to 5.5, and in the oxidation pond, sulfite ions are oxidized, and byproduct of desulfuration is led out from the oxidation pond; and fresh limestone slurry is added into a circulating pond, the circulating pond operates in a pH range from 6 to 6.5, and slurry is led from the circulating pound into the absorption tower to be sprayed for deselfuration. The device and the method contribute to improving quality of gypsum, desulfuration efficiency, reducing limestone consumption and lowering investment and operation cost, and are suitable for flue gas desulfuration when sulfur coal is burnt or different kinds of fire coal are burnt.

Description

technical field [0001] The invention relates to a flue gas desulfurization device and a flue gas desulfurization method, in particular to a double-slot wet flue gas desulfurization device and method based on dual pH value operation, belonging to the field of industrial waste gas purification and environmental protection. Background technique [0002] Wet flue gas desulfurization is the most widely used and most effective desulfurization process in the world. In the limestone wet flue gas desulfurization process, the existing wet desulfurization tower integrates the original cooling tower, absorption tower, and oxidation tower, and all chemical processes are completed in one tower. In the process of wet flue gas desulfurization, the pH value of desulfurization slurry is a very important influencing parameter. In the desulfurization process, the dissolution of limestone and the oxidation of calcium sulfite are suitable for low pH, while high pH is beneficial for SO 2 In orde...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/50B01D53/96C04B11/26
Inventor 杜谦高建民高继慧王建峰赵志峰赵昊阳赵广播吴少华秦裕琨
Owner HARBIN INST OF TECH
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