A low-temperature non-coagulating coal-water slurry additive

Abstract

This invention discloses a low-temperature non-coagulating coal-water slurry additive. It comprises the following components in parts by weight: 20-40 parts sulfonate, 10-20 parts stabilizer, 10-30 parts antifreeze, 3-5 parts surface modifier, 1-3 parts defoamer, 1-5 parts pH adjuster, 1-3 parts flocculant, and 40-80 parts water. The coal-water slurry additive of this invention uses a composite sulfonate, resulting in good stability of the coal-water slurry. The use of a composite antifreeze lowers the freezing point of the solvent, preventing the coal-water slurry from solidifying at low temperatures and maintaining good fluidity, thereby increasing its efficiency in low-temperature environments and preventing coking during low-temperature combustion.

Description

Technical Field

[0001] This invention belongs to the field of additive preparation technology for coal-water slurry, and specifically relates to a low-temperature non-coagulating coal-water slurry additive. Background Technology

[0002] Coal-water slurry is a slurry-like fuel composed of pulverized coal, water, and chemical additives. It is primarily used to replace traditional petroleum fuels to improve combustion efficiency and reduce environmental pollution. Coal-water slurry has a wide range of applications, including power plant boilers, small and medium-sized industrial boilers, building materials such as ceramics, and the coal chemical industry. In the coal chemical industry, coal-water slurry can be used to synthesize chemicals such as ammonia, methanol, dimethyl ether, and olefins through pressurized gasification technology. Furthermore, coal-water slurry offers environmental benefits by reducing CO2 emissions, which is of great significance to local governments and environmental protection efforts.

[0003] Since water is the primary solvent in coal-water slurry, it easily solidifies at low temperatures. After solidification, the slurry undergoes low-temperature combustion during use, which can easily lead to coking, reducing combustion efficiency and increasing maintenance costs. Furthermore, low-temperature combustion can cause operational instability because the physical and chemical properties of the coal-water slurry change at low temperatures, potentially affecting the continuity and stability of the combustion process. In terms of safety, potential problems during low-temperature combustion include an increased risk of equipment failure and safety hazards due to coking. Adding low-melting-point solvents can address this issue; however, low-melting-point solvents are generally organic compounds, which are much more expensive than water, significantly increasing costs. The amount of additives used in coal-water slurry is relatively low. Therefore, finding suitable additive combinations to lower the solidification point and improve the stability of the slurry is a key research focus in this field. Summary of the Invention

[0004] The purpose of this invention is to provide a low-temperature non-coagulating coal-water slurry additive.

[0005] A low-temperature non-coagulating coal-water slurry additive is composed of the following components in parts by weight: 20-40 parts sulfonate, 10-20 parts stabilizer, 10-30 parts antifreeze, 3-5 parts surface modifier, 1-3 parts defoamer, 1-5 parts pH adjuster, 1-3 parts flocculant, and 40-80 parts water.

[0006] The sulfonate is one or more of sodium lignosulfonate, potassium lignosulfonate, sodium naphthalenesulfonate, sodium sulfobutyl β-cyclodextrin, sulfonated humate, and sodium dodecylbenzenesulfonate.

[0007] The stabilizer is one or more of sodium carboxymethyl cellulose, polycarboxylic acid, titanium dioxide, and chitosan.

[0008] The surface modifier is one or more of the following: silane coupling agent KH-550, silane coupling agent KH-570, silane coupling agent KH-590, phthalate coupling agent, and maleic anhydride-grafted acrylic acid.

[0009] The defoamer is dimethyl silicone oil and / or a silicone ether copolymer.

[0010] The pH adjuster is a sodium hydroxide aqueous solution with a mass concentration of 5-15%.

[0011] The antifreeze agent is one or more of alkyl glycosides, rice husk ash, urea, and ethylene glycol butyl ether acetate.

[0012] The flocculant is polyacrylamide.

[0013] The preparation method of the low-temperature non-coagulating coal-water slurry additive involves taking 20-40 parts by weight of sulfonate, 10-20 parts by weight of stabilizer, 10-30 parts by weight of antifreeze, 3-5 parts by weight of surface modifier, 1-3 parts by weight of defoamer, 1-5 parts by weight of pH adjuster, and 1-3 parts by weight of flocculant, adding 40-80 parts by weight of water, heating to 40-60℃, stirring for 30-60 minutes, and passing through a 150-300 mesh sieve to obtain the coal-water slurry additive.

[0014] The beneficial effects of this invention are as follows: The coal-water slurry additive of this invention uses a composite sulfonate, which improves the stability of the coal-water slurry. The use of a composite antifreeze agent lowers the freezing point of the solvent, preventing the coal-water slurry from solidifying at low temperatures and maintaining good fluidity. This increases its efficiency in low-temperature environments and prevents coking during low-temperature combustion. Detailed Implementation

[0015] To facilitate understanding of the present invention, a more comprehensive description will be given below. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the present invention.

[0016] Example 1

[0017] A low-temperature non-coagulating coal-water slurry additive is composed of the following components in parts by weight: 15 parts sodium sulfonyl β-cyclodextrin, 15 parts sulfonated humate, 15 parts sodium carboxymethyl cellulose, 10 parts alkyl glycoside, 10 parts rice husk ash, 4 parts silane coupling agent KH-550, 2 parts dimethyl silicone oil, 3 parts 10% sodium hydroxide aqueous solution, 2 parts polyacrylamide, and 60 parts water.

[0018] The above-mentioned method for preparing low-temperature non-coagulating coal-water slurry additive involves taking 15 parts by weight of sodium sulfonyl β-cyclodextrin, 15 parts of sulfonated humate, 15 parts of sodium carboxymethyl cellulose, 10 parts of alkyl glycoside, 10 parts of rice husk ash, 4 parts of silane coupling agent KH-550, 2 parts of dimethyl silicone oil, 3 parts of 10% sodium hydroxide aqueous solution, and 2 parts of polyacrylamide, adding 60 parts of water, heating to 50℃, stirring for 40 minutes, and passing through a 200-mesh sieve to obtain the coal-water slurry additive.

[0019] Example 2

[0020] A low-temperature non-coagulating coal-water slurry additive is composed of the following components in parts by weight: 10 parts of sodium sulfonyl β-cyclodextrin, 10 parts of sulfonated humate, 10 parts of polycarboxylic acid, 6 parts of alkyl glycoside, 6 parts of rice husk ash, 3 parts of silane coupling agent KH-570, 1 part of silicone ether copolymer, 1 part of 15% sodium hydroxide aqueous solution, 1 part of polyacrylamide, and 40 parts of water.

[0021] The above-mentioned method for preparing low-temperature non-coagulating coal-water slurry additive involves taking 10 parts by weight of sodium sulfonyl β-cyclodextrin, 10 parts of sulfonated humate, 10 parts of polycarboxylic acid, 6 parts of alkyl glycoside, 6 parts of rice husk ash, 3 parts of silane coupling agent KH-570, 1 part of silicone ether copolymer, 1 part of 15% sodium hydroxide aqueous solution, and 1 part of polyacrylamide, adding 40 parts of water, heating to 40°C, stirring for 60 minutes, and passing through a 150-mesh sieve to obtain the coal-water slurry additive.

[0022] Example 3

[0023] A low-temperature non-coagulating coal-water slurry additive is composed of the following components in parts by weight: 20 parts sodium sulfonyl β-cyclodextrin, 20 parts sulfonated humate, 20 parts titanium dioxide, 15 parts urea, 15 parts ethylene glycol butyl ether acetate, 5 parts maleic anhydride-grafted acrylic acid, 3 parts dimethyl silicone oil, 4 parts 8% sodium hydroxide aqueous solution, 3 parts polyacrylamide, and 80 parts water.

[0024] The above-mentioned method for preparing low-temperature non-coagulating coal-water slurry additive involves taking 20 parts by weight of sodium sulfonyl β-cyclodextrin, 20 parts of sulfonated humate, 20 parts of titanium dioxide, 15 parts of urea, 15 parts of ethylene glycol butyl ether acetate, 5 parts of maleic anhydride-grafted acrylic acid, 3 parts of dimethyl silicone oil, 4 parts of 8% sodium hydroxide aqueous solution, and 3 parts of polyacrylamide, adding 80 parts of water, heating to 60°C, stirring for 30 minutes, and passing through a 300-mesh sieve to obtain the coal-water slurry additive.

[0025] Comparative Example 1

[0026] A low-temperature non-coagulating coal-water slurry additive is composed of the following components in parts by weight: 30 parts of sodium sulfonyl β-cyclodextrin, 15 parts of sodium carboxymethyl cellulose, 10 parts of alkyl glycoside, 10 parts of rice husk ash, 4 parts of silane coupling agent KH-550, 2 parts of dimethyl silicone oil, 3 parts of a 10% sodium hydroxide aqueous solution, 2 parts of polyacrylamide, and 60 parts of water.

[0027] The above-mentioned method for preparing low-temperature non-coagulating coal-water slurry additive involves taking 30 parts by weight of sodium sulfonyl β-cyclodextrin, 15 parts by weight of sodium carboxymethyl cellulose, 10 parts by weight of alkyl glycoside, 10 parts by weight of rice husk ash, 4 parts by weight of silane coupling agent KH-550, 2 parts by weight of dimethyl silicone oil, 3 parts by weight of 10% sodium hydroxide aqueous solution, 2 parts by weight of polyacrylamide, adding 60 parts by weight of water, heating to 50°C, stirring for 40 minutes, and passing through a 200-mesh sieve to obtain the coal-water slurry additive.

[0028] Comparative Example 2

[0029] A low-temperature non-coagulating coal-water slurry additive is composed of the following components in parts by weight: 30 parts sulfonated humate, 15 parts sodium carboxymethyl cellulose, 10 parts alkyl glycoside, 10 parts rice husk ash, 4 parts silane coupling agent KH-550, 2 parts dimethyl silicone oil, 3 parts 10% sodium hydroxide aqueous solution, 2 parts polyacrylamide, and 60 parts water.

[0030] The above-mentioned method for preparing low-temperature non-coagulating coal-water slurry additive involves taking 30 parts by weight of sulfonated humate, 15 parts of sodium carboxymethyl cellulose, 10 parts of alkyl glycoside, 10 parts of rice husk ash, 4 parts of silane coupling agent KH-550, 2 parts of dimethyl silicone oil, 3 parts of 10% sodium hydroxide aqueous solution, and 2 parts of polyacrylamide, adding 60 parts of water, heating to 50°C, stirring for 40 minutes, and passing through a 200-mesh sieve to obtain the coal-water slurry additive.

[0031] Comparative Example 3

[0032] A low-temperature non-coagulating coal-water slurry additive is composed of the following components in parts by weight: 15 parts of sodium sulfonyl β-cyclodextrin, 15 parts of sulfonated humate, 15 parts of sodium carboxymethyl cellulose, 20 parts of alkyl glycoside, 4 parts of silane coupling agent KH-550, 2 parts of dimethyl silicone oil, 3 parts of a 10% sodium hydroxide aqueous solution, 2 parts of polyacrylamide, and 60 parts of water.

[0033] The above-mentioned method for preparing low-temperature non-coagulating coal-water slurry additive involves taking 15 parts by weight of sodium sulfonyl β-cyclodextrin, 15 parts of sulfonated humate, 15 parts of sodium carboxymethyl cellulose, 20 parts of alkyl glycoside, 4 parts of silane coupling agent KH-550, 2 parts of dimethyl silicone oil, 3 parts of 10% sodium hydroxide aqueous solution, and 2 parts of polyacrylamide, adding 60 parts of water, heating to 50°C, stirring for 40 minutes, and passing through a 200-mesh sieve to obtain the coal-water slurry additive.

[0034] Comparative Example 4

[0035] A low-temperature non-coagulating coal-water slurry additive is composed of the following components in parts by weight: 15 parts of sodium sulfonyl β-cyclodextrin, 15 parts of sulfonated humate, 15 parts of sodium carboxymethyl cellulose, 20 parts of rice husk ash, 4 parts of silane coupling agent KH-550, 2 parts of dimethyl silicone oil, 3 parts of a 10% sodium hydroxide aqueous solution, 2 parts of polyacrylamide, and 60 parts of water.

[0036] The above-mentioned method for preparing low-temperature non-coagulating coal-water slurry additive involves taking 15 parts by weight of sodium sulfonyl β-cyclodextrin, 15 parts of sulfonated humate, 15 parts of sodium carboxymethyl cellulose, 20 parts of rice husk ash, 4 parts of silane coupling agent KH-550, 2 parts of dimethyl silicone oil, 3 parts of 10% sodium hydroxide aqueous solution, and 2 parts of polyacrylamide, adding 60 parts of water, heating to 50°C, stirring for 40 minutes, and passing through a 200-mesh sieve to obtain the coal-water slurry additive.

[0037] Comparative Example 5

[0038] A low-temperature non-coagulating coal-water slurry additive is composed of the following components in parts by weight: 20 parts sodium sulfonyl β-cyclodextrin, 20 parts sulfonated humate, 20 parts titanium dioxide, 30 parts urea, 5 parts maleic anhydride-grafted acrylic acid, 3 parts dimethyl silicone oil, 4 parts 8% sodium hydroxide aqueous solution, 3 parts polyacrylamide, and 80 parts water.

[0039] The above-mentioned method for preparing low-temperature non-coagulating coal-water slurry additive involves taking 20 parts by weight of sodium sulfonyl β-cyclodextrin, 20 parts of sulfonated humate, 20 parts of titanium dioxide, 30 parts of urea, 5 parts of maleic anhydride-grafted acrylic acid, 3 parts of dimethyl silicone oil, 4 parts of 8% sodium hydroxide aqueous solution, and 3 parts of polyacrylamide, adding 80 parts of water, heating to 60°C, stirring for 30 minutes, and passing through a 300-mesh sieve to obtain the coal-water slurry additive.

[0040] Comparative Example 6

[0041] A low-temperature non-coagulating coal-water slurry additive is composed of the following components in parts by weight: 20 parts sodium sulfonyl β-cyclodextrin, 20 parts sulfonated humate, 20 parts titanium dioxide, 30 parts ethylene glycol butyl ether acetate, 5 parts maleic anhydride-grafted acrylic acid, 3 parts dimethyl silicone oil, 4 parts 8% sodium hydroxide aqueous solution, 3 parts polyacrylamide, and 80 parts water.

[0042] The above-mentioned method for preparing low-temperature non-coagulating coal-water slurry additive involves taking 20 parts by weight of sodium sulfonyl β-cyclodextrin, 20 parts of sulfonated humate, 20 parts of titanium dioxide, 30 parts of ethylene glycol butyl ether acetate, 5 parts of maleic anhydride-grafted acrylic acid, 3 parts of dimethyl silicone oil, 4 parts of 8% sodium hydroxide aqueous solution, and 3 parts of polyacrylamide, adding 80 parts of water, heating to 60°C, stirring for 30 minutes, and passing through a 300-mesh sieve to obtain the coal-water slurry additive.

[0043] Experimental Example 1: Stability Determination

[0044] Water-coal slurry additives prepared in Examples 1-3 and Comparative Examples 1-2 were used to prepare water-coal slurries with an additive content of 3%, wherein the coal powder content was 62% and the water content was 35%. The stability of the water-coal slurry was characterized by the water separation rate. A suitable amount of water-coal slurry was poured into a flat-bottomed test tube, sealed, and allowed to stand for 6 hours and 48 hours. The height of the water separation layer and the total height of the slurry were measured using vernier calipers. The water separation rate was the percentage of the height of the clear water layer after 6 hours and 48 hours relative to the total height of the water-coal slurry. The lower the water separation rate, the better the surface stability of the water-coal slurry. Each experiment was repeated three times, and the average value was taken. Statistical analysis was performed using SPSS 24.0 software. Quantitative data were analyzed using... (mean ± standard deviation) represents the mean. The Kolmogorov-Smirnov test was used to test the normality of the data. For normally distributed data, the t-test was used to compare the differences in means between two groups. A p-value < 0.05 was considered statistically significant.

[0045] The measurement results are shown in Table 1:

[0046] Table 1

[0047]

[0048] Note: * indicates that compared with Example 1 group, P<0.05.

[0049] Experimental Example 2:

[0050] Since coal-water slurry is a solid-liquid mixture, its freezing point cannot be directly measured. Measuring the freezing point of a solution containing additives and water can characterize the slurry's freeze resistance. Using the additives prepared in Examples 1-3 and Comparative Examples 3-6, aqueous solutions containing 3% additives were prepared. The freezing point of the aqueous solution containing 3% additives was measured using a self-cooling freezing point meter (NGD-40a, Nanjing Feimi). Each experiment was repeated three times, and the average value was taken. Statistical analysis was performed using SPSS 24.0 software. Quantitative data were analyzed using... (mean ± standard deviation) represents the mean. The Kolmogorov-Smirnov test was used to test the normality of the data. For normally distributed data, the t-test was used to compare the differences in means between two groups. A p-value < 0.05 was considered statistically significant.

[0051] The measurement results are shown in Table 2:

[0052] Table 2

[0053]

[0054] Note: * indicates P<0.05 compared with Example 1 group, # indicates P<0.05 compared with Example 3 group.

[0055] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A low-temperature non-coagulating coal-water slurry additive, characterized in that, It is composed of the following components in parts by weight: 20-40 parts sulfonate, 10-20 parts stabilizer, 10-30 parts antifreeze, 3-5 parts surface modifier, 1-3 parts defoamer, 1-5 parts pH adjuster, 1-3 parts flocculant, and 40-80 parts water. The sulfonate is sodium sulfobutyl β-cyclodextrin and sulfonated humate, with a mass ratio of 1:

1. The antifreeze agent is alkyl glycoside and rice husk ash in a mass ratio of 1:1, or the antifreeze agent is urea and ethylene glycol butyl ether acetate in a mass ratio of 1:

1.

2. The low-temperature non-coagulating coal-water slurry additive according to claim 1, characterized in that, The stabilizer is one or more of sodium carboxymethyl cellulose, polycarboxylic acid, titanium dioxide, and chitosan.

3. The low-temperature non-coagulating coal-water slurry additive according to claim 1, characterized in that, The surface modifier is one or more of the following: silane coupling agent KH-550, silane coupling agent KH-570, silane coupling agent KH-590, phthalate coupling agent, and maleic anhydride-grafted acrylic acid.

4. The low-temperature non-coagulating coal-water slurry additive according to claim 1, characterized in that, The defoamer is dimethyl silicone oil and / or a silicone ether copolymer.

5. The low-temperature non-coagulating coal-water slurry additive according to claim 1, characterized in that, The pH adjuster is a sodium hydroxide aqueous solution with a mass concentration of 5-15%.

6. The low-temperature non-coagulating coal-water slurry additive according to claim 1, characterized in that, The flocculant is polyacrylamide.

7. The preparation method of the low-temperature non-coagulating coal-water slurry additive according to claim 1, characterized in that, Take 20-40 parts by weight of sulfonate, 10-20 parts of stabilizer, 10-30 parts of antifreeze, 3-5 parts of surface modifier, 1-3 parts of defoamer, 1-5 parts of pH adjuster, and 1-3 parts of flocculant, add 40-80 parts of water, heat to 40-60℃, stir for 30-60 minutes, and pass through a 150-300 mesh sieve to obtain the coal-water slurry additive.

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