Zinc oxide desulfurization process

A desulfurization process, zinc oxide technology, applied in chemical instruments and methods, dispersed particle separation, separation methods, etc., can solve problems such as pipeline blockage, circulation pump and pipeline wear

Inactive Publication Date: 2015-06-10
洛阳市甘霖生物技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its main purpose is to solve the problems of pipeline blockage, circulation pump and pipeline wear in the current technology

Method used

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  • Zinc oxide desulfurization process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A zinc oxide desulfurization process is characterized in that: its preparation steps are:

[0029] Absorption process: The aqueous solution of sodium acetate (NaAc) is used as the absorption liquid. When the pH value is greater than or equal to 3.5, it is in reverse contact with the flue gas containing sulfur dioxide in the absorption tower. The sodium acetate in the absorption liquid reacts with the sulfur dioxide in the flue gas to generate acetic acid. and sodium bisulfite. Sodium acetate is the medium;

[0030] Reaction process: when the pH value is less than 3.5, the aqueous solution of the medium enters the reactor outside the absorption tower, reacts with zinc oxide, and regenerates NaAc and H in step (1). 2 O and precipitation;

[0031] Filtration: when the pH value was 6.5~9, the product in step (2) was filtered, and the filter residue was precipitation, the filtrate is an aqueous solution of NaAc;

[0032] Filtrate circulation: The filtrate in step (3) ...

Embodiment 2

[0034] A zinc oxide desulfurization process is characterized in that: its preparation steps are:

[0035] Absorption process: The aqueous solution of sodium hydroxide (NaOH) is used as the absorption liquid, and when the pH value is greater than or equal to 3.5, it is in reverse contact with the flue gas containing sulfur dioxide in the absorption tower, and the sodium hydroxide in the absorption liquid reacts with the sulfur dioxide in the flue gas. Sodium sulfite is generated, and sodium sulfite further reacts with sulfur dioxide in the flue gas to generate sodium bisulfite. The medium is sodium sulfite;

[0036] Reaction process: when the pH value is less than 3.5, the aqueous solution of the medium enters the reactor outside the absorption tower, reacts with zinc oxide, and regenerates Na in step (1). 2 SO 3 、H 2 O and precipitation;

[0037] Filtration: when the pH value was 6.5~9, the product in step (2) was filtered, and the filter residue was precipitated, the ...

Embodiment 3

[0041] A zinc oxide desulfurization process is characterized in that: its preparation steps are:

[0042] Absorption process: with sodium carbonate (Na 2 CO 3) is the absorption liquid, and when the pH value is greater than or equal to 3.5, it is in reverse contact with the flue gas containing sulfur dioxide in the absorption tower, and the sodium carbonate in the absorption liquid reacts with the sulfur dioxide in the flue gas to form sodium sulfite, which further reacts with the sulfur dioxide in the flue gas Sulfur dioxide reacts to form sodium bisulfite. The medium is sodium sulfite;

[0043] Reaction process: when the pH value is less than 3.5, the aqueous solution of the medium enters the reactor outside the absorption tower, reacts with zinc oxide, and regenerates Na in step (1). 2 SO 3 、H 2 O and ZnSO 3 precipitation;

[0044] Filtration: when the pH value was 6.5~9, the product in step (2) was filtered, and the filter residue was precipitated, the filtrate wa...

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Abstract

The invention discloses a zinc oxide desulfurization process. The zinc oxide desulfurization process comprises the following steps: absorption, wherein strong alkali and weak acid salt or a strong alkali aqueous solution acts as absorption liquid and contacts with sulfur-contained flue gas in an absorption column reversely, sulfur dioxide in flue gas is absorbed, and the absorption process is the reaction of strong alkali and weak acid salt or strong alkali in the absorption liquid and sulfur dioxide, so that an aqueous solution of a medium is generated; reaction, wherein the aqueous solution of the medium enters a reactor outside the absorption column and reacts with zinc oxide, so that strong alkali and weak acid brine and zinc sulfite precipitate, or sulfite, water and zinc sulfite precipitate are generated again; filtration, wherein the products are filtered, the filter residue is zinc sulfite precipitate, and the filtrate is an aqueous solution of strong alkali and weak acid salt or weak acid salt; filtrate circulation, wherein the filtrate acts as an absorption liquid and is conveyed to the absorption column for the next circulation.

Description

technical field [0001] The invention belongs to the technical field of flue gas desulfurization, and in particular relates to a zinc oxide desulfurization process. Background technique [0002] At present, the commonly used desulfurization methods can be roughly divided into wet type and dry type. Among them, wet type desulfurization is stable, high in efficiency, and widely used. Wet desulfurization mainly includes: calcium method (such as lime / gypsum method, limestone / gypsum method, sodium calcium double alkali method), soda ash method, ammonia soda method, magnesium oxide method and zinc oxide method. Each method has certain advantages and disadvantages. insufficient. [0003] Calcium method (such as lime / gypsum method, limestone / gypsum method, sodium-calcium double-alkali method) produces waste during desulfurization, the desulfurization efficiency is low, and there is secondary pollution; the cost of using soda ash method, ammonia-soda method, and magnesium oxide metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/50B01D53/73
Inventor 王克强张杏元
Owner 洛阳市甘霖生物技术有限公司
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