Wet flue gas desulfurization (WFGD) process for gypsum through oxidization in tower by using calcium-based strongly basic substance

A technology of wet flue gas desulfurization and internal oxidation, applied in chemical instruments and methods, calcium/strontium/barium sulfate, separation methods, etc., can solve the problems of large equipment investment and high operating costs, and achieve environmental pollution, spraying The effect of reducing the leaching resistance and avoiding the problem of oxidation facilities

Inactive Publication Date: 2010-09-29
SHANGHAI LONGKING ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It can be seen that both the calcium-based weak alkali-gypsum method and the traditional calcium-based strong alkali-gypsum flue gas desulfurization process have the problems of large equipment investment and high operating costs

Method used

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  • Wet flue gas desulfurization (WFGD) process for gypsum through oxidization in tower by using calcium-based strongly basic substance
  • Wet flue gas desulfurization (WFGD) process for gypsum through oxidization in tower by using calcium-based strongly basic substance

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Embodiment Construction

[0021] figure 1 It is the working flow chart of the absorbing tower. It can be seen from the figure that the calcium oxide-based strong alkali gypsum wet flue gas desulfurization process in the tower includes the flue gas desulfurization of the absorbing tower, the slurry supply, circulation and discharge of the absorbent slurry, and the dehydration of the gypsum. system, characterized in that:

[0022] (1) In the slurry tank of the absorption tower, the oxidation automatic isolator 1 and the oxidation air pipe 2 are alternately arranged and arranged alternately, and the entire slurry tank is divided into upper and lower parts: the upper low pH value zone 7 and the lower high pH value zone 8;

[0023] (2) Absorbent slurry tanks use calcium-based strong alkali substances, such as quicklime, slaked lime or carbide slag, etc., which are digested to make absorbent slurry, which is pumped into the slurry pool of the absorption tower by the slurry supply pump 17 and placed at a high...

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Abstract

The invention relates to a wet flue gas desulfurization (WFGD) process for gypsum through oxidization in a tower by using a calcium-based strongly basic substance, belonging to the technical field of WFGD. The invention is characterized in that oxidization automatic isolators and oxidization air tubes in the slurry pond of an absorption tower are alternately arranged at intervals to divide the whole slurry pond into an upper low pH value region and a lower high pH value region; the calcium-based strongly basic substance is used as an absorbent; the absorbent slurry is sprayed downwards from the top of the absorption tower to be in contact with flue gas for absorbing sulfur dioxide, and then, the absorbent slurry falls into the upper low pH value region of the slurry pond to be forcibly oxidized; a jet mixing system is adopted for preventing solid matters from depositing on the bottom of the absorption tower; and an upper slurry discharging port is used for discharging slurry and dehydrating gypsum to generate solid gypsum powder the water content of which is less than 10%. The invention has the advantages that ideal desulfurization efficiency can be achieved only by smaller liquid-gas ratio, absorption of sulfur dioxide and forced oxidization and crystallization of by-products are completed in the single absorption tower, the equipment investment is saved, the power consumption is lowered, and the operating cost is low.

Description

technical field [0001] The invention belongs to the technical field of wet flue gas desulfurization, and relates to the absorption of sulfur dioxide and the forced oxidation and crystallization of by-products in one tower (absorption tower) using quicklime, slaked lime or calcium carbide slag and other calcium-based strong alkali substances as absorbents , and finally generate gypsum through the dehydration system, and there is no additional oxidation facility outside the absorption tower. Background technique [0002] Generally, in the wet limestone-gypsum flue gas desulfurization process using a calcium-based weak base (such as calcium carbonate) as an absorbent, limestone is a neutral compound, and its solubility in water is small. Therefore, the slurry pool in the absorption tower is easy to maintain weakly acidic conditions (pH=4.5-5.5) suitable for the forced oxidation of the primary by-product (calcium sulfite), thereby ensuring the quality of the desulfurization by-p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/80B01D53/50C01F11/46
Inventor 阎冬王建华吴景辉何永胜
Owner SHANGHAI LONGKING ENVIRONMENTAL PROTECTION
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