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A method for inhibiting fouling of double-alkali flue gas desulfurization process

A technology of desulfurization process and dual-alkali method, which is applied in the field of inhibiting calcium sulfite scaling in the double-alkali flue gas desulfurization process, can solve the problems that organic phosphonates and modified copolymers are not easy to obtain, and achieve the purpose of inhibiting scaling Effect

Inactive Publication Date: 2011-12-21
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its shortcoming is that the organic phosphonate used in this invention and the modified copolymer are all difficult to obtain

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The temperature of the desulfurization regeneration solution is 40°C, where Na 2 SO 3 The content is 5% (weight), NaOH2% (weight), Ca 2+ Concentration 80mg / L, add hydroxyethylidene diphosphonic acid (HEDP) 2mg / L, acrylic acid / hydroxypropyl acrylate / methyl acrylate copolymer 6mg / L to the desulfurization regeneration liquid, absorb SO 2 To pH 7.0, analyze the Ca in the desulfurization solution 2+ concentration, calculated as Ca 2+ The deposition rate, the results are shown in Table 1 below.

Embodiment 2

[0037] The temperature of the desulfurization regeneration solution is 30°C, where Na 2 SO 3 The content is 5% (weight), NaOH2% (weight), Ca 2+ With a concentration of 80mg / L, add 6mg / L p-diphosphinesulfonic acid and 4mg / L acrylic acid / styrenesulfonic acid copolymer to the desulfurization regeneration solution to absorb SO 2 and SO 3 Mix gas to pH 6.0, analyze Ca in desulfurization liquid 2+ concentration, calculated as Ca 2+ The deposition rate, the results are shown in Table 1 below.

Embodiment 3

[0039] The temperature of the desulfurization regeneration solution is 25°C, where Na 2 SO 3 The content is 2% (weight), NaOH1.5%, Ca 2+ Concentration 150mg / L, add 2-phosphonic acid-1,2,4-tricarboxylic butane 1mg / L, acrylic acid / 2-methyl-2'-acrylamidopropanesulfonic acid copolymer to the desulfurization regeneration solution 8mg / L, absorb SO 2 To pH 6.5, analyze the Ca in the desulfurization solution 2+ concentration, calculated as Ca 2+ The deposition rate, the results are shown in Table 1 below.

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Abstract

The invention relates to a method for inhibiting scaling of a double-alkali flue gas desulfurization process, comprising adding a scale inhibitor to the desulfurization regeneration liquid to prevent calcium sulfite and calcium sulfate from scaling, wherein the scale inhibitor consists of at least one organic phosphine acid and at least one organic carboxylic acid polymer. After the scale inhibitor of the present invention is added to the desulfurization regeneration liquid, the Ca2+ deposition rate is greatly reduced, which can effectively inhibit the formation of calcium scale in the double-alkali flue gas desulfurization process. On the one hand, the present invention can solve the problem that the lye of saturated calcium sulfite and calcium sulfate after regeneration is easy to scale in the conveying pipeline; In addition, the pH value of the absorption liquid is neutral, so that calcium sulfite and calcium sulfate are supersaturated and precipitated, resulting in fouling of the absorption tower and affecting long-term operation.

Description

technical field [0001] The invention relates to a method for inhibiting scaling in a double-alkali flue gas desulfurization process, in particular to a method for inhibiting calcium sulfite scaling in a double-alkali flue gas desulfurization process. Background technique [0002] Double-alkali flue gas desulfurization technology uses sodium hydroxide (NaOH) or sodium carbonate (NaOH) 2 CO 3 ) solution as the start-up desulfurizer (the first base), the prepared start-up desulfurizer solution is directly poured into the desulfurization tower to wash and remove sulfur dioxide (SO 2 ) and sulfur trioxide (SO 3 ) to achieve the purpose of flue gas desulfurization, the desulfurization product is sodium bisulfite (NaHSO 3 ), sodium sulfite (Na 2 SO 3 ) and sodium sulfate (Na 2 SO 4 ). Then the desulfurization product is regenerated with lime (CaO) (second alkali) in the desulfurization agent regeneration tank, and the lye (also called regenerated NaOH solution or desulfuriz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/56
Inventor 何承厚郦和生秦会敏王岽楼琼慧杨玉李博伟吴颖
Owner CHINA PETROLEUM & CHEM CORP
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