A desulfurization synergist for power plants and its preparation method

Abstract

The present invention relates to the technical field of desulfurization synergists, and provides a desulfurization synergist for power plants and a preparation method thereof. A desulfurization synergist for power plants comprises raw materials in the following parts by weight: 60 - 80 parts of organic acid, 15 - 25 parts of organic acid salt compounds, 3 - 5 parts of 1-octanesulfonamide, 8 - 10 parts of scale inhibitor, and 1 - 3 parts of catalyst. Through the above technical solution, the problems of serious scaling and low desulfurization efficiency in the related art are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of desulfurization synergists, and specifically, to a desulfurization synergist for power plants and a preparation method thereof. Background Art

[0002] With the increasing attention of society to the ecological environment, improving air quality has become one of the important tasks of governments of various countries. At present, the main method used for desulfurization in power plants in China is wet flue gas desulfurization by the gypsum method. However, in the environment of high-sulfur coal and low emission standards, the desulfurization efficiency is limited to a certain extent. And in the desulfurization system, this method will produce a large amount of gypsum waste residue, and gypsum and other solid particulate matters may cause blockage and scaling problems inside the equipment, affecting the normal operation of the equipment. Therefore, developing a scale-resistant desulfurization synergist is an urgent problem to be solved at present. Summary of the Invention

[0003] The present invention provides a desulfurization synergist for power plants and a preparation method thereof, which solve the problems of serious scaling and low desulfurization efficiency in the related art.

[0004] The technical solution of the present invention is as follows: The present invention provides a desulfurization synergist for power plants, which comprises raw materials in the following parts by weight: 60 - 80 parts of organic acid, 15 - 25 parts of organic acid salt compounds, 3 - 5 parts of 1-octanesulfonamide, 8 - 10 parts of scale inhibitor, and 1 - 3 parts of catalyst.

[0005] As a further technical solution, the organic acid includes one or more of citric acid, adipic acid, and salicylic acid.

[0006] As a further technical solution, the organic acid salt compounds include one or more of sodium adipate, sodium succinate, and sodium acetate.

[0007] As a further technical solution, the scale inhibitor includes polyacrylic acid and / or aniline phosphate.

[0008] In the present invention, aniline phosphate is added as a scale inhibitor. During the wet flue gas desulfurization process by the gypsum method, sulfides and oxides in the flue gas will react with metal ions in the wet desulfurization equipment, resulting in the formation of dirt (such as calcium sulfate). The anilino group can form complexes with these metal ions, preventing their reaction with sulfides and oxides, which helps to reduce the generation of dirt. The phosphate group has a negative charge and can also complex with metal ions, thereby reducing the reaction of metal ions participating in the formation of dirt; polyacrylic acid can complex with hardness ions such as calcium and magnesium ions in water, inhibiting the formation of dirt, thus preventing scaling problems. Polyacrylic acid also has a dispersing effect, which helps to disperse and suspend the already formed dirt particles in water and avoid redepositing on the equipment surface, thereby reducing the risk of equipment blockage and effectively improving the desulfurization efficiency.

[0009] As a further technical solution, when the scale inhibitor is polyacrylic acid and aniline phosphate, the mass ratio of polyacrylic acid to aniline phosphate is 2-8:1.

[0010] In the present invention, the addition of polyacrylic acid and aniline phosphate can better improve the scale inhibition effect of the desulfurization synergist. After use, the accumulation of scale inside the desulfurization tower is reduced, the phenomena of component bending deformation and desulfurization caused by scale formation are reduced, the service life is prolonged, the maintenance workload is reduced, and the desulfurization efficiency is further improved.

[0011] As a further technical solution, the mass ratio of polyacrylic acid to aniline phosphate is 4:1.

[0012] As a further technical solution, the solid content of the polyacrylic acid is 30%-50%.

[0013] As a further technical solution, the catalyst includes one or two of iron oxide and manganese sulfate.

[0014] The present invention also provides a desulfurization synergist for power plants and a preparation method thereof, including the following steps: mixing the raw materials and stirring evenly to obtain the desulfurization synergist.

[0015] As a further technical solution, the stirring time is 30-60 min.

[0016] As a further technical solution, the stirring speed is 300-360 r / min.

[0017] The working principle and beneficial effects of the present invention are as follows:

[0018] In the present invention, 1-octanesulfonamide is added. The sulfonamide it contains helps to form a complex with sulfur dioxide, thereby increasing the interaction with sulfur dioxide, promoting the absorption and stabilization of sulfur dioxide, and significantly improving the desulfurization efficiency in the wet flue gas desulfurization process; the alkane chain contained in 1-octanesulfonamide has lipophilicity, which enables it to better interact with lipophilic substances such as sulfur dioxide in the flue gas during the desulfurization process, increasing the contact surface area between the desulfurizer and sulfur dioxide, enhancing the absorption efficiency in the wet flue gas desulfurization process, and further improving the desulfurization efficiency. Specific Embodiments

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of the present invention.

[0020] In the following examples and comparative examples:

[0021] Polyacrylic acid: solid content 30%, 40%, 50%, manufacturer is Zibo Dongrun Chemical Technology Co., Ltd.

[0022] Example 1

[0023] Weigh 60 parts of citric acid, 15 parts of sodium adipate, 3 parts of 1-octanesulfonamide, 8 parts of polyacrylic acid (solid content 30%), and 1 part of iron oxide, stir at 300 r / min for 60 min. After stirring evenly, a desulfurization synergist is obtained.

[0024] Example 2

[0025] Weigh 70 parts of adipic acid, 20 parts of sodium succinate, 4 parts of 1-octanesulfonamide, 9 parts of polyacrylic acid (solid content 40%), and 2 parts of iron oxide, stir at 300 r / min for 60 min. After stirring evenly, a desulfurization synergist is obtained.

[0026] Example 3

[0027] Weigh 80 parts of salicylic acid, 25 parts of sodium acetate, 5 parts of 1-octanesulfonamide, 10 parts of polyacrylic acid (solid content 50%), and 3 parts of manganese sulfate, stir at 300 r / min for 60 min. After stirring evenly, a desulfurization synergist is obtained.

[0028] Example 4

[0029] Compared with Example 2, the difference in Example 4 is that the polyacrylic acid (solid content 40%) is replaced with an equal amount of aniline phosphate.

[0030] Example 5

[0031] Compared with Example 2, the difference in Example 5 is that 9 parts of polyacrylic acid (solid content 40%) are replaced with 4.5 parts of polyacrylic acid (solid content 40%) and 4.5 parts of aniline phosphate.

[0032] Example 6

[0033] Compared with Example 2, the difference in Example 6 is that 9 parts of polyacrylic acid (solid content 40%) are replaced with 6 parts of polyacrylic acid (solid content 40%) and 3 parts of aniline phosphate.

[0034] Example 7

[0035] Compared with Example 2, the difference in Example 7 is that 9 parts of polyacrylic acid (solid content 40%) are replaced with 7.2 parts of polyacrylic acid (solid content 40%) and 1.8 parts of aniline phosphate.

[0036] Example 8

[0037] Compared with Example 2, Example 8 is different in that 9 parts of polyacrylic acid (solid content 40%) are replaced with 8 parts of polyacrylic acid (solid content 40%) and 1 part of aniline phosphate.

[0038] Example 9

[0039] Compared with Example 2, Example 9 is different in that 9 parts of polyacrylic acid (solid content 40%) are replaced with 8.1 parts of polyacrylic acid (solid content 40%) and 0.9 part of aniline phosphate.

[0040] Comparative Example 1

[0041] Compared with Example 2, Comparative Example 1 is different in that 1-octanesulfonamide is not added.

[0042] Comparative Example 2

[0043] Compared with Example 2, Comparative Example 2 is different in that the detergent is not added.

[0044] The desulfurization synergists prepared in Examples 1-9 and Comparative Examples 1-2 were tested according to the following method:

[0045] The sulfur dioxide content in the desulfurization system is 2000 mg / m 3 , the system liquid-gas ratio is 15 L / cm 3 , and the slurry property is 20% limestone slurry.

[0046] 1. Desulfurization efficiency: The above synergist was applied to the desulfurization system, and the synergist was added according to a concentration ratio of 800 ppm. The SO2 in the outlet gas was analyzed using a sulfur dioxide analyzer to calculate the desulfurization efficiency.

[0047] 2. Scale layer thickness: The above synergist was added to the slurry in the desulfurization tower, and the scale layer thickness at the same position at the bottom of the tower and the demister was recorded every 1 month to obtain the increased scale layer thickness after desulfurization.

[0048] The measurement results are shown in Table 1.

[0049] Table 1 Performance test results of the desulfurization synergists prepared in Examples 1-9 and Comparative Examples 1-2

[0050]

[0051] Compared with Comparative Example 1, 1-octanesulfonamide was added in Examples 1-3. As a result, the desulfurization efficiency of Examples 1-3 was higher than that of Comparative Example 1, indicating that 1-octanesulfonamide has strong synergistic ability and can improve the desulfurization efficiency of the desulfurization system.

[0052] Compared with Comparative Example 2, scale inhibitors polyacrylic acid was added in Examples 1 to 3, and aniline phosphate was added in Example 4. As a result, the scale layer thickness of Examples 1 to 4 was less than that of Comparative Example 2, and the desulfurization efficiency of Examples 1 to 4 was higher than that of Comparative Example 2, indicating that both polyacrylic acid and aniline phosphate have strong scale removal ability, can reduce the scale layer thickness of the desulfurization system, reduce the accumulation of waste, and thus improve the desulfurization efficiency.

[0053] Compared with Examples 2 and 4, polyacrylic acid and aniline phosphate were added simultaneously in Examples 5 to 9. As a result, the desulfurization efficiency of Examples 5 to 9 was higher than that of Examples 2 and 4, and the scale layer thickness was less than that of Examples 2 and 4, indicating that polyacrylic acid and aniline phosphate play a synergistic role, can further improve the desulfurization efficiency of the desulfurization system and reduce the generation of scale layer at the same time.

[0054] Compared with Example 5, different proportions of polyacrylic acid and aniline phosphate were added in Examples 6 to 9. As a result, the desulfurization efficiency of Examples 6 to 8 was higher than that of Example 5 and Example 9, and the scale layer thickness was less than that of Example 5 and Example 9. It shows that when the mass ratio of polyacrylic acid to aniline phosphate is 2 to 8:1, and the preferred ratio is 4:1, the desulfurization efficiency of the desulfurization system can be maximized and the generation of scale layer can be reduced.

[0055] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A desulfurization efficiency enhancer for power plants, characterized in that Raw materials comprising the following components in parts by weight: 60 - 80 parts of organic acid, 15 - 25 parts of organic acid salt compounds, 3 - 5 parts of 1 - octanesulfonamide, 8 - 10 parts of detergent, 1 - 3 parts of catalyst; The detergent comprises polyacrylic acid and aniline phosphate, and the mass ratio of polyacrylic acid to aniline phosphate is 4:1; The solid content of the polyacrylic acid is 40%.

2. The desulfurization synergist for power plants according to claim 1, characterized in that, The organic acid comprises one or more of citric acid, adipic acid, and salicylic acid.

3. The desulfurization efficiency enhancer for power plants according to claim 1, characterized in that, The organic acid salt compounds comprise one or more of sodium adipate, sodium succinate, and sodium acetate.

4. The desulfurization efficiency enhancer for power plants according to claim 1, wherein The catalyst comprises one or two of iron oxide and manganese sulfate.

5. A preparation method of a desulfurization synergist for a power plant according to any one of claims 1 to 4, characterized in that, Comprising the following steps: mixing the raw materials and stirring evenly to obtain the desulfurization synergist.

6. The preparation method of a desulfurization synergist for power plants according to claim 5, characterized in that, The stirring time is 30 - 60 min.

7. The preparation method of a desulfurization synergist for power plants according to claim 5, characterized in that, The stirring speed is 300 - 360 r / min.

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