Additive for limestone-gypsum wet desulphurization of industrial flue gas

A technology for wet desulfurization and industrial flue gas, applied in the direction of gas treatment, separation methods, chemical instruments and methods, etc., can solve problems such as difficult to obtain gypsum, corrosion resistance, etc., to promote dissolution, prevent equipment corrosion, and improve air utilization Effect

Inactive Publication Date: 2020-12-08
CNOOC TIANJIN CHEM RES & DESIGN INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of existing wet desulfurization additives that cannot prevent corrosion and obtain relatively pure gypsum, and provide a preparation method for wet desulfurization additives that can improve desulfurization effect, corrosion resistance, scale inhibition and gypsum purification

Method used

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  • Additive for limestone-gypsum wet desulphurization of industrial flue gas
  • Additive for limestone-gypsum wet desulphurization of industrial flue gas
  • Additive for limestone-gypsum wet desulphurization of industrial flue gas

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add the wet desulfurization additive of the present invention by 0.1% of the 20% limestone slurry quality (the composition of the wet desulfurization additive is as shown in Table 1), and the concentration of sulfur dioxide in the tail gas is 12mg / m 3 , the desulfurization efficiency is 97.6%. After desulfurization, take the solid residue at the bottom of the absorption tower and dry it. The elemental composition of the solid residue after drying was measured by a Japanese Rigaku ZSXPrimusⅡ X-ray fluorescence spectrometer, wherein Fe (in the form of Fe 2 o 3 Total) content is 0.34%.

[0023] Table 1 Composition of wet desulfurization additives

[0024] Composition content(%) citric acid 50 Sodium citrate 27 magnesium sulfate 3 Manganese sulfate 3 Sodium dodecyl benzene sulfonate 2 POCA 3 Ethylenediaminetetraacetic acid 3 Sulfonated lignin 3 hydrogen peroxide 4 Nano Calcium Sulfate 2

Embodiment 2

[0026] Add wet desulfurization additive by 0.1% of the mass of 20% limestone slurry (the composition of wet desulfurization additive is shown in Table 2), and the concentration of sulfur dioxide in the tail gas is 14mg / m 3 , The desulfurization efficiency is 97.2%. After desulfurization, take the solid residue at the bottom of the absorption tower and dry it. The elemental composition of the solid residue after drying was measured by a Japanese Rigaku ZSXPrimusⅡ X-ray fluorescence spectrometer, wherein Fe (in the form of Fe 2 o 3 Total) content is 0.31%.

[0027] Table 2 Composition of wet desulfurization additives

[0028] Composition content(%) citric acid 45 Sodium citrate 26 magnesium sulfate 4 copper sulfate 5 Sodium dodecyl benzene sulfonate 3 POCA 4 Ethylenediaminetetraacetic acid 3 Sulfonated lignin 3 hydrogen peroxide 5 Nano Calcium Sulfate 2

Embodiment 3

[0030] Add wet desulfurization additive by 0.1% of the mass of 20% limestone slurry (the composition of wet desulfurization additive is shown in Table 2), and the concentration of sulfur dioxide in the tail gas is 18mg / m 3 , the desulfurization efficiency is 96.4%. After desulfurization, take the solid residue at the bottom of the absorption tower and dry it. The elemental composition of the solid residue after drying was measured by a Japanese Rigaku ZSXPrimusⅡ X-ray fluorescence spectrometer, wherein Fe (in the form of Fe 2 o 3 Total) content is 0.29%.

[0031] Table 2 Composition of wet desulfurization additives

[0032]

[0033]

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PUM

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Abstract

The invention discloses an additive for wet desulphurization of industrial flue gas limestone gypsum. The additive comprises 20%-75% of organic acid, 20%-75% of salt corresponding to the organic acid,0.1%-8% of metal sulfate, 0.1%-8% of dispersing agent, 0.1%-8% of corrosion inhibitor, 0.1%-8% of metal ion complexing agent, 0.1%-20% of scale inhibitor, 0.1%-8% of oxidizing agent and 0.1%-5% of nano calcium sulfate. The additive can be used in a desulfurizing absorption tower, and has the functions of improving the desulfurizing effect, preventing corrosion and scale and purifying gypsum.

Description

Technical field: [0001] The invention relates to an additive for industrial flue gas limestone-gypsum wet desulfurization. Background technique: [0002] At present, the commonly used desulfurization processes mainly include dry desulfurization, semi-dry desulfurization and wet desulfurization. Among them, the limestone-gypsum wet desulfurization process is widely used. The advantage is that limestone is used as a sulfur dioxide absorbent with low cost, and the desulfurization effect is good, and the desulfurization efficiency basically reaches 90%. However, with the increasingly stringent environmental protection policies, the emission concentration limit of sulfur dioxide in flue gas is getting lower and lower, and the traditional wet desulfurization process is facing huge environmental pressure. [0003] Limestone-gypsum wet desulfurization additives can promote the absorption of sulfur dioxide in flue gas and improve the desulfurization effect of wet desulfurization pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/50B01D53/80
CPCB01D53/502B01D53/80B01D2258/0283
Inventor 苏少龙曲晓龙钟读乐孙彦民南军李世鹏曾贤君张利杰李贺冯晴
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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