A low-temperature non-coal slurry solvent

Abstract

This invention discloses a low-temperature non-freezing solvent for coal-water slurry. It is composed of water, alcohol compounds, ether compounds, and inorganic salts. This coal-water slurry solvent will not solidify even at -20°C, thus increasing the upper limit of the maximum concentration of coal-water slurry, increasing its calorific value, and effectively solving the problem of coking during low-temperature combustion of coal-water slurry. The combined use of ethylene glycol and 1,2-propanediol, as well as the combined use of CaHPO4 and ZnCl2 in the components, further lowers the solvent's freezing point.

Description

Technical Field

[0001] This invention belongs to the field of solvent preparation technology for coal-water slurry, and specifically relates to a low-temperature non-coagulating coal-water slurry solvent. 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. When solidified, 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 caused by coking and other factors. Summary of the Invention

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

[0005] A low-temperature non-coagulating coal-water slurry solvent, composed of water, alcohol compounds, ether compounds, and inorganic salts.

[0006] Preferably, it is composed of the following components in parts by weight: 100-200 parts water, 10-30 parts alcohol, 10-15 parts ether, and 1-3 parts inorganic salt.

[0007] The alcohol compound is one or more of ethanol, ethylene glycol, 1,3-propanediol, 1,2-propanediol, glycerol, and butanediol.

[0008] Preferably, the alcohol compound is a mixture of ethylene glycol and 1,2-propanediol in a volume ratio of 2:1.

[0009] The ether compound is one or more of diethyl ether, methyl ethyl ether, and isopropyl ether.

[0010] The inorganic salt is one or more of CaHPO4, CaSO4, MgCl2, and ZnCl2.

[0011] Preferably, the inorganic salt is a mixture of CaHPO4 and ZnCl2 in a mass ratio of 1:2.

[0012] The method for preparing the low-temperature non-coal slurry solvent involves dissolving alcohol compounds, ether compounds, and inorganic salts in water, stirring for 10-30 minutes, and allowing it to stand for 1-3 hours.

[0013] The beneficial effects of this invention are as follows: The coal-water slurry solvent of this invention will not solidify even at -20°C, thus increasing the upper limit of the maximum concentration of coal-water slurry, increasing the calorific value of the coal-water slurry, and effectively solving the problem of coking during low-temperature combustion of coal-water slurry. The combined use of ethylene glycol and 1,2-propanediol, as well as the combined use of CaHPO4 and ZnCl2 in the components, further lowers the freezing point of the solvent. Detailed Implementation

[0014] 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.

[0015] Example 1

[0016] A low-temperature non-coagulating coal-water slurry solvent is composed of the following components in parts by weight: 150 parts water, 21 parts alcohol, 12 parts diethyl ether, and 1.5 parts inorganic salt; wherein the alcohol is a mixture of ethylene glycol and 1,2-propanediol in a volume ratio of 2:1; and the inorganic salt is a mixture of CaHPO4 and ZnCl2 in a mass ratio of 1:2.

[0017] The above-mentioned method for preparing low-temperature non-coal slurry solvent involves dissolving alcohol compounds, diethyl ether, and inorganic salts in water, stirring for 20 minutes, and allowing it to stand for 2 hours.

[0018] Example 2

[0019] A low-temperature non-coagulating coal-water slurry solvent comprises the following components in parts by weight: 120 parts water, 12 parts alcohol, 10 parts diethyl ether, 0.6 parts CaSO4, and 0.6 parts MgCl2. The alcohol is a mixture of ethanol and 1,3-propanediol in a volume ratio of 1:1.

[0020] The method for preparing the low-temperature non-coal slurry solvent involves dissolving alcohols, ethers, and inorganic salts in water, stirring for 12 minutes, and allowing it to stand for 1 hour.

[0021] Example 3

[0022] A low-temperature non-coagulating coal-water slurry solvent comprises the following components in parts by weight: 180 parts water, 27 parts alcohol, 7 parts methyl ethyl ether, 7 parts isopropyl ether, and 2.5 parts CaSO4. The alcohol is a mixture of glycerol and 1,2-propanediol in a volume ratio of 2:1.

[0023] The method for preparing the low-temperature non-coal slurry solvent involves dissolving alcohol compounds, ether compounds, and inorganic salts in water, stirring for 30 minutes, and allowing it to stand for 3 hours.

[0024] Comparative Example 1

[0025] A low-temperature non-coagulating coal-water slurry solvent is composed of the following components in parts by weight: 150 parts water, 21 parts ethylene glycol, 12 parts diethyl ether, and 1.5 parts inorganic salt; wherein the inorganic salt is a mixture of CaHPO4 and ZnCl2 in a mass ratio of 1:2.

[0026] The above-mentioned method for preparing low-temperature non-coagulating coal-water slurry solvent involves dissolving ethylene glycol, diethyl ether, and inorganic salt in water, stirring for 20 minutes, and allowing it to stand for 2 hours.

[0027] Comparative Example 2

[0028] A low-temperature non-coagulating coal-water slurry solvent is composed of the following components in parts by weight: 150 parts water, 21 parts 1,2-propanediol, 12 parts diethyl ether, and 1.5 parts inorganic salt; wherein the inorganic salt is a mixture of CaHPO4 and ZnCl2 in a mass ratio of 1:2.

[0029] The above-mentioned method for preparing low-temperature non-coagulating coal-water slurry solvent involves dissolving 1,2-propanediol, diethyl ether, and inorganic salt in water, stirring for 20 minutes, and allowing it to stand for 2 hours.

[0030] Comparative Example 3

[0031] A low-temperature non-coagulating coal-water slurry solvent is composed of the following components in parts by weight: 150 parts water, 21 parts alcohol, 12 parts diethyl ether, and 1.5 parts CaHPO4; wherein the alcohol is a mixture of ethylene glycol and 1,2-propanediol in a volume ratio of 2:1.

[0032] The above-mentioned method for preparing low-temperature non-coal slurry solvent involves dissolving alcohol compounds, diethyl ether, and CaHPO4 in water, stirring for 20 minutes, and allowing it to stand for 2 hours.

[0033] Comparative Example 4

[0034] A low-temperature non-coagulating coal-water slurry solvent is composed of the following components in parts by weight: 150 parts water, 21 parts alcohol, 12 parts diethyl ether, and 1.5 parts ZnCl2; wherein the alcohol is a mixture of ethylene glycol and 1,2-propanediol in a volume ratio of 2:1.

[0035] The above-mentioned method for preparing low-temperature non-coal slurry solvent involves dissolving alcohol compounds, diethyl ether, and ZnCl2 in water, stirring for 20 minutes, and allowing it to stand for 2 hours.

[0036] Experimental example:

[0037] The freezing points of the coal-water slurry solvents prepared in Examples 1-3 and Comparative Examples 1-4 were determined using a self-cooling freezing point apparatus (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.

[0038] The measurement results are shown in Table 1:

[0039] Table 1

[0040]

[0041] Note: * indicates that compared with Example 1 group, P<0.05.

[0042] 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 solvent, characterized in that, It is composed of water, alcohols, ethers, and inorganic salts; the alcohols are a mixture of ethylene glycol and 1,2-propanediol in a volume ratio of 2:1; the inorganic salts are a mixture of CaHPO4 and ZnCl2 in a mass ratio of 1:

2.

2. The low-temperature non-solidifying coal-water slurry solvent according to claim 1, characterized in that, It consists of the following components in parts by weight: 100-200 parts water, 10-30 parts alcohols, 10-15 parts ethers, and 1-3 parts inorganic salts.

3. The low-temperature non-solidifying coal-water slurry solvent according to claim 1, characterized in that, The ether compound is one or more of diethyl ether, methyl ethyl ether, and isopropyl ether.

4. The method for preparing the low-temperature non-solidifying coal-water slurry solvent according to claim 1, characterized in that, The alcohol, ether, and inorganic salt are dissolved in water, stirred for 10-30 minutes, and allowed to stand for 1-3 hours to prepare the product.

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