Coal antioxidant composition and use method thereof

Abstract

The invention relates to a coal anti-oxidation composition and a use method thereof.The coal anti-oxidation composition adopts a polymeric phenol substance as a main antioxidant, on one hand, polymeric phenol forms a film on the surface of coal, the contact reaction between oxygen and the surface of coal molecules is effectively reduced, and the risk of oxidation reaction of coal can be reduced; on the other hand, polymeric phenols are used as a source of hydrogen and react with peroxy free radicals to generate stable free radicals, chain growth is terminated, and the calorific value of efficient and stable coal quality can be reduced. Moreover, phosphite ester substances are adopted as auxiliary antioxidants to prevent formation of new free radicals, so that the purpose of terminating chain reaction is achieved, and the calorific value of efficient and stable coal quality can be further reduced. In addition, sodium chloride is adopted as inorganic salt, fluorine pollution and heavy metal pollution caused by traditional inorganic salt antioxidants can be avoided, and the pollution degree to the surrounding environment can be reduced.

Description

Technical Field

[0001] The present disclosure relates to the field of antioxidants for coal, and in particular, to a coal antioxidant composition and a method for using the same. Background Art

[0002] As an important energy source, coal is widely used in power generation, smelting and other fields. However, the oxidation and spontaneous combustion of coal in coal yards not only affect production safety and the surrounding environment, but also easily cause coal dust explosions and fires. Therefore, the prevention and control of spontaneous combustion and oxidation in coal yards is still an important and arduous task that thermal power generation companies must constantly grasp. Many experts and scholars at home and abroad are also committed to studying the regularity of coal spontaneous combustion and oxidation.

[0003] The oxidation and spontaneous combustion of coal is a very complex physical and chemical change process. In iron and steel plants, power plants, etc., coal is placed in a piled state in the coal storage area. When air penetrates into the loose coal body, the oxygen in the air comes into contact with the active structure on the surface of the coal molecules, and a complex physical and chemical reaction occurs at normal temperature and pressure, generating and releasing heat. The temperature inside the coal deposit rises, which easily leads to spontaneous combustion. Summary of the invention

[0004] The purpose of the present disclosure is to provide a coal antioxidant composition and a method of using the same, so as to solve the problems existing in the prior art of spontaneous combustion of piled coal due to oxidation reaction and environmental pollution caused by existing antioxidants.

[0005] In order to achieve the above-mentioned object, the first aspect of the present disclosure provides a coal antioxidant composition, which comprises a primary antioxidant, a secondary antioxidant, a catalyst, an inorganic salt, a surfactant and water; The primary antioxidant includes a polymeric phenolic antioxidant; The secondary antioxidant includes a phosphite antioxidant; The inorganic salt includes sodium chloride; Based on the total weight of the coal antioxidant composition, the content of the primary antioxidant is 10-20% by weight, the content of the secondary antioxidant is 5-10% by weight, the content of the catalyst is 1-3% by weight, the content of the inorganic salt is 1-3% by weight, the content of the surfactant is 1-4% by weight, and the content of water is 60-82% by weight.

[0006] Optionally, based on the total weight of the coal antioxidant composition, the content of the primary antioxidant is 13~18% by weight, the content of the secondary antioxidant is 6~9% by weight, the content of the catalyst is 2~2.5% by weight, the content of the inorganic salt is 1.5~2% by weight, the content of the surfactant is 2~3% by weight, and the content of water is 65~80% by weight.

[0007] Optionally, the catalyst includes one or more of triethylamine, N,N-dimethylformamide and thioacetamide.

[0008] Optionally, the surfactant includes a copolymer of polysiloxane and acrylic acid and / or a copolymer of polysiloxane and acrylate; the molecular weight of the copolymer in the surfactant is 300-400.

[0009] Optionally, the polymeric phenolic antioxidant includes dicyclopentadiene-p-cresol resin; The phosphite antioxidant includes tris(2,4-di-tert-butylphenyl)phosphite; The catalyst comprises one or a mixture of two of triethylamine, N,N-dimethylformamide and thioacetamide; The surfactant includes polydimethylsiloxane-b-polymethacrylic acid and / or polydimethylsiloxane-b-polymethyl methacrylate.

[0010] Optionally, the weight ratio of the total weight of the primary antioxidant, the secondary antioxidant and the catalyst to the surfactant is (8.5-15):1.

[0011] Optionally, the weight ratio of the primary antioxidant to the secondary antioxidant is (1.5-3.0):1.

[0012] The second aspect of the present disclosure provides a method for using a coal antioxidant composition, the method comprising: The coal antioxidant composition described in the first aspect is mixed with water to obtain a coal antioxidant solution; the coal antioxidant solution is transported to various locations in the coal yard through a water outlet pipeline for coal antioxidant treatment.

[0013] Optionally, the weight ratio of the coal antioxidant composition to water is 3 to 10 weight %.

[0014] Optionally, when performing the coal antioxidant treatment, the temperature of the coal antioxidant solution is maintained at 15-25°C.

[0015] Through the above technical scheme, the present invention adopts polymeric phenolic substances as the main antioxidant. On the one hand, polymeric phenols form a thin film on the surface of coal, effectively reducing the contact reaction between oxygen and the surface of coal molecules, which can reduce the risk of coal oxidation reaction; on the other hand, polymeric phenols, as a source of hydrogen, react with peroxy radicals to generate stable free radicals, terminate the growth of the chain, and can reduce the calorific value of efficient and stable coal. In addition, the present invention adopts phosphite substances as secondary antioxidants to prevent the formation of new free radicals to achieve the purpose of terminating the chain reaction, which can further reduce the calorific value of efficient and stable coal. In addition, the use of sodium chloride as an inorganic salt can avoid fluorine pollution and heavy metal pollution caused by traditional inorganic salt antioxidants, and can reduce the degree of pollution to the surrounding environment.

[0016] Other features and advantages of the present disclosure will be described in detail in the following detailed description. DETAILED DESCRIPTION

[0017] The specific embodiments of the present disclosure are described in detail below. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure, and are not used to limit the present disclosure.

[0018] The first aspect of the present disclosure provides a coal antioxidant composition, which includes a primary antioxidant, a secondary antioxidant, a catalyst, an inorganic salt, a surfactant and water; The primary antioxidant includes a polymeric phenolic antioxidant; The secondary antioxidant includes a phosphite antioxidant; The inorganic salt includes sodium chloride; Based on the total weight of the coal antioxidant composition, the content of the primary antioxidant is 10-20% by weight, the content of the secondary antioxidant is 5-10% by weight, the content of the catalyst is 1-3% by weight, the content of the inorganic salt is 1-3% by weight, the content of the surfactant is 1-4% by weight, and the content of water is 60-82% by weight.

[0019] Through the above technical scheme, the present invention adopts polymeric phenolic substances as the main antioxidant. On the one hand, polymeric phenols form a thin film on the surface of coal, effectively reducing the contact reaction between oxygen and the surface of coal molecules, and can reduce the risk of coal oxidation reaction; on the other hand, polymeric phenols, as a source of hydrogen, react with peroxy radicals to generate stable free radicals, terminate the growth of the chain, and can reduce the calorific value of efficient and stable coal quality. In addition, the present invention adopts phosphite substances as secondary antioxidants to prevent the formation of new free radicals to achieve the purpose of terminating the chain reaction, which can further reduce the calorific value of efficient and stable coal quality. The main idea of ​​the existing traditional coal antioxidant is to isolate the coal from contact with air, thereby reducing the oxidation effect, and the present application mainly consumes the free radicals generated by the oxidation reaction by the main antioxidant through the synergistic effect between the main antioxidant and the secondary antioxidant. In addition, the use of sodium chloride as an inorganic salt can avoid fluorine pollution and heavy metal pollution caused by traditional inorganic salt antioxidants, and can reduce the degree of pollution to the surrounding environment.

[0020] In a preferred embodiment, the polymeric phenolic antioxidant disclosed in the present invention includes one or more of dicyclopentadiene-p-cresol resin and dicyclopentadiene-p-ethylphenol resin.

[0021] In a further preferred embodiment, the polymeric phenolic antioxidant disclosed herein comprises dicyclopentadiene-p-cresol resin.

[0022] In this embodiment, the auto-oxidation reaction of the polymer material includes three stages: chain initiation, chain growth, and chain termination. In the chain initiation stage, the carbon-hydrogen bond of the organic substance breaks under the action of heat, light, stress, initiator, variable valence metal, and hydroperoxide decomposition product, generating alkyl free radicals. In the chain growth stage, hydroperoxide accumulates and splits at low temperatures, and the splitting is accelerated at medium temperature. The new free radicals generated react with hydrocarbons to form chain growth, and the oxidation rate is accelerated. Finally, the free radicals combine with each other to generate inert substances, and the chain growth terminates. Polymeric phenol antioxidants can react with peroxy radicals as a source of hydrogen, suppress the formation of hydroperoxides, generate stable free radicals, terminate the growth of the chain, and can reduce the heat generated by the oxidation reaction, thereby avoiding the phenomenon of spontaneous combustion of coal.

[0023] In a preferred embodiment, the phosphite antioxidant includes tris(2,4-di-tert-butylphenyl)phosphite.

[0024] In this embodiment, a suitable type of secondary antioxidant is used. On the one hand, phosphite can remove oxygen from peroxide to generate phosphate, and hydroperoxide is decomposed into stable compounds such as alcohol or ether, thereby preventing the formation of new free radicals to achieve the purpose of terminating the chain reaction, thereby further reducing the heat generated by the oxidation reaction; on the other hand, the secondary antioxidant can reduce the number of active free radicals required by the polymeric phenolic antioxidant, and the chain-terminating antioxidant also reduces the burden of the oxide decomposer.

[0025] In one embodiment, the catalyst used in the present disclosure includes one or more of triethylamine, N,N-dimethylformamide and thioacetamide.

[0026] In a preferred embodiment, the catalyst used in the present disclosure is any one of triethylamine, N,N-dimethylformamide and thioacetamide, or a combination of any two thereof.

[0027] In this embodiment, the use of a suitable catalyst can promote the polymeric phenolic antioxidant to react with peroxyl radicals as a source of hydrogen, thereby increasing the priority of such reactions and further reducing the risk of oxidation reactions between oxygen and coal.

[0028] In one embodiment, the surfactant used in the present disclosure includes a copolymer of polysiloxane and acrylic acid and / or a copolymer of polysiloxane and acrylate.

[0029] In a preferred embodiment, the surfactant includes polydimethylsiloxane-b-polymethacrylic acid and polydimethylsiloxane-b-polymethyl methacrylate.

[0030] In a further preferred embodiment, the content of the polydimethylsiloxane-b-polymethacrylic acid is 50-60% by weight, and the content of the polydimethylsiloxane-b-polymethyl methacrylate is 40-50% by weight. In this embodiment, the ratio between the components in the surfactant can be flexibly adjusted according to actual needs, for example, the content of the polydimethylsiloxane-b-polymethacrylic acid in the surfactant can be one of 50% by weight, 51% by weight, 52% by weight, 53% by weight, 54% by weight, 55% by weight, 56% by weight, 57% by weight, 58% by weight, 59% by weight and 60% by weight, or any two of the range; the content of the polydimethylsiloxane-b-polymethyl methacrylate in the surfactant can be one of 40% by weight, 41% by weight, 42% by weight, 43% by weight, 44% by weight, 45% by weight, 46% by weight, 47% by weight, 48% by weight, 49% by weight and 50% by weight, or any two of the range.

[0031] In one embodiment, the molecular weight of the copolymer in the surfactant is 300 to 400. In this embodiment, the two ends of the surfactant used in the present disclosure are respectively a hydrophilic end and a hydrophobic end, the hydrophilic end extends into the aqueous solution, and the hydrophobic end is connected to the agglomerating agent molecule. The use of two copolymers with different hydrophobic ends can be combined with different substances of the formed network structure macromolecules, further improving the surface activity of the formed network structure macromolecules. The molecular weight of the copolymer in the surfactant can be flexibly set according to the properties of the formed network structure macromolecules, for example, the molecular weight of the copolymer in the surfactant is 310, 330, 350, 380 or any range between two.

[0032] In one embodiment, the water used in the present disclosure is deionized water.

[0033] In a preferred embodiment, the deionized water is of EWII grade.

[0034] In the above embodiment, the component mixture of the surfactant and the primary antioxidant, the secondary antioxidant, and the catalyst is fully miscible in the water body, and the aqueous mixture is a homogeneous system. In the process of full mixing, the component mixture of the surfactant and the primary antioxidant, the oxidative decomposition agent, and the catalyst begins to separate into two layers in the water body, one layer mainly containing the surfactant, and the other layer mainly containing the component mixture of the primary antioxidant, the oxidative decomposition agent, and the catalyst. Due to the repulsion of the same charge, a mutually repulsive zone is maintained between the diffuse double electric layers of the surfactant and the combined mixture coil, forming a thermodynamically stable solution. During full mixing, due to the compression of the double electric layer, the surfactants approach each other, the double electric layers overlap, the polymer coils tend to curl up, the repulsive zone between the surfactant and the combined mixture molecules decreases, and a dense two-dimensional separation trend begins to be generated. And when the electrolyte concentration increases to a certain value, it is separated into two distinct phases. The oxidative decomposition agent can reduce the critical micelle concentration, which helps to form soluble micelles, and the addition of a catalyst helps to eliminate the stratification between the component mixture of the surfactant and the primary antioxidant, the oxidative decomposition agent, and the catalyst.

[0035] In a preferred embodiment, based on the total weight of the coal antioxidant composition, the content of the primary antioxidant is 13-18 weight %, the content of the secondary antioxidant is 6-9 weight %, the content of the catalyst is 2-2.5 weight %, the content of the inorganic salt is 1.5-2 weight %, the content of the surfactant is 2-3 weight %, and the content of water is 65-80 weight %.

[0036] In this embodiment, when the content of each component in the coal antioxidant composition is at an appropriate content, the synergistic effect between the main antioxidant, the secondary antioxidant and the catalyst can be enhanced, which can not only reduce the oxidation reaction between oxygen and coal, but also reduce the heat generated during the free radical reaction, thereby reducing the risk of spontaneous combustion of coal.

[0037] In one embodiment, the weight ratio of the total weight of the primary antioxidant, the secondary antioxidant and the catalyst to the surfactant is (8.5-15):1.

[0038] In a preferred embodiment, the weight ratio of the total weight of the primary antioxidant, the secondary antioxidant and the catalyst to the weight of the surfactant is (9-14.5):1.

[0039] In this embodiment, the weight ratio of the total weight of the primary antioxidant, the secondary antioxidant and the catalyst to the surfactant can be flexibly adjusted according to actual production needs. For example, the weight ratio can be one of 9, 9.5, 10, 10.5, 11, 11.5, 12, 12.5, 13, 13.5, 14 and 14.5 or a range between any two of them.

[0040] In one embodiment, the weight ratio of the primary antioxidant to the secondary antioxidant is (1.5-3.0):1.

[0041] In a preferred embodiment, the weight ratio of the primary antioxidant to the secondary antioxidant is (1.8-2.5):1.

[0042] In this embodiment, the weight ratio of the primary antioxidant to the secondary antioxidant can be flexibly adjusted according to actual production needs. For example, the weight ratio can be one of 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4 and 2.5 or a range between any two of them.

[0043] A method for using a coal antioxidant composition, the method comprising: The coal antioxidant composition described in the first aspect is mixed with water to obtain a coal antioxidant solution; the coal antioxidant solution is transported to various locations in the coal yard through a water outlet pipeline for coal antioxidant treatment.

[0044] In one embodiment, the weight ratio of the coal antioxidant composition to the water is 3 to 10 weight %.

[0045] In a preferred embodiment, the weight ratio of the coal antioxidant composition to the water is 4-8 weight %.

[0046] In one embodiment, when the coal antioxidant treatment is performed, the temperature of the coal antioxidant solution is maintained at 15-25°C.

[0047] In one embodiment, the method for using the coal antioxidant composition comprises: S1. Send the coal antioxidant composition into a metering box and configure it into an antioxidant reagent with a concentration of 5-10% by mass; S2. Slowly open the water inlet flow regulating valve of the metering box to prevent excessive water inlet flow and pressure from causing impact on the measurement system; when the water inlet level reaches 20%, start the mixer and stir continuously for 10 to 20 minutes to fully stir the reagents in the above formula until they are uniform; S3. Slowly open the water inlet flow regulating valve of the metering box to prevent excessive water inlet flow and pressure from causing impact on the measurement system; when the water inlet level reaches 40%, start the mixer and stir continuously for 10 to 20 minutes to fully stir the reagents; S4. Slowly open the water inlet flow regulating valve of the metering box to prevent excessive water inlet flow and pressure from causing impact on the measurement system; when the water inlet level reaches 80%, start the mixer and stir continuously for 10 to 20 minutes to fully stir the reagents; S5. Open the water outlet regulating valve of the metering box, start the metering pump, and transport the configured green and environmentally friendly antioxidant reagent to various locations in the coal yard through the water outlet pipeline.

[0048] The present disclosure is further illustrated by examples below, but the present disclosure is not limited thereto. Unless otherwise specified, the chemicals used in the following examples and comparative examples are all commercially available products with a purity of more than 99% by weight, wherein the chemicals include dicyclopentadiene-p-cresol resin, tris(2,4-di-tert-butylphenyl)phosphite, polydimethylsiloxane-b-polymethacrylic acid, and polydimethylsiloxane-b-polymethyl methacrylate.

[0049] Example 1 The method for preparing the coal antioxidant composition S1 comprises: 1 kg of dicyclopentadiene-p-cresol resin, 0.5 kg of tris(2,4-di-tert-butylphenyl)phosphite, 0.2 kg of a mixture of triethylamine and N,N-dimethylformamide, 0.1 kg of sodium chloride and 0.2 kg of polydimethylsiloxane-b-polymethacrylic acid (molecular weight 306) were added into 8 kg of secondary deionized water for mixing and stirring to obtain a coal antioxidant composition S1; Based on the total weight of the coal antioxidant composition, the content of the primary antioxidant is 10 weight %, the content of the secondary antioxidant is 5 weight %, the content of the catalyst is 2 weight %, the content of the inorganic salt is 1 weight %, the content of the surfactant is 2 weight %, and the content of water is 80 weight %.

[0050] Example 2 The method for preparing the coal antioxidant composition S2 comprises: 2 kg of dicyclopentadiene-p-cresol resin, 1 kg of tri(2,4-di-tert-butylphenyl)phosphite, 0.3 kg of a mixture of triethylamine and thioacetamide, 0.2 kg of sodium chloride and 0.3 kg of polydimethylsiloxane-b-polymethyl methacrylate (molecular weight 306) were added into 6.2 kg of secondary deionized water for mixing and stirring to obtain a coal antioxidant composition S2; Based on the total weight of the coal antioxidant composition, the content of the primary antioxidant is 20 weight %, the content of the secondary antioxidant is 10 weight %, the content of the catalyst is 3 weight %, the content of the inorganic salt is 2 weight %, the content of the surfactant is 3 weight %, and the content of water is 62 weight %.

[0051] Example 3 The method for preparing the coal antioxidant composition S3 comprises: 1.5 kg of dicyclopentadiene-p-cresol resin, 0.8 kg of tris(2,4-di-tert-butylphenyl)phosphite, 0.25 kg of a mixture of triethylamine and N,N-dimethylformamide, 0.15 kg of sodium chloride and 0.25 kg of polydimethylsiloxane-b-polymethacrylic acid (molecular weight 306) were added into 7.05 kg of secondary deionized water for mixing and stirring to obtain a coal antioxidant composition S3; Based on the total weight of the coal antioxidant composition, the content of the primary antioxidant is 15 weight %, the content of the secondary antioxidant is 8 weight %, the content of the catalyst is 2.5 weight %, the content of the inorganic salt is 1.5 weight %, the content of the surfactant is 2.5 weight %, and the content of water is 70.5 weight %.

[0052] Example 4 The method for preparing the coal antioxidant composition S4 comprises: 1.3 kg of dicyclopentadiene-p-cresol resin, 0.6 kg of tris(2,4-di-tert-butylphenyl)phosphite, 0.2 kg of triethylamine, 0.1 kg of sodium chloride and 0.2 kg of a mixture of polydimethylsiloxane-b-polymethacrylic acid (molecular weight 306) and polydimethylsiloxane-b-polymethyl methacrylate (molecular weight 306) are added to 7.6 kg of secondary deionized water for mixing and stirring to obtain a coal antioxidant composition S4; wherein the weight ratio of polydimethylsiloxane-b-polymethacrylic acid to polydimethylsiloxane-b-polymethyl methacrylate is 2:1; Based on the total weight of the coal antioxidant composition, the content of the primary antioxidant is 13 weight %, the content of the secondary antioxidant is 6 weight %, the content of the catalyst is 2 weight %, the content of the inorganic salt is 1 weight %, the content of the surfactant is 2 weight %, and the content of water is 76 weight %.

[0053] Example 5 The method for preparing the coal antioxidant composition S5 comprises: 1.8 kg of dicyclopentadiene-p-cresol resin, 0.9 kg of tris(2,4-di-tert-butylphenyl)phosphite, 0.2 kg of a mixture of triethylamine and N,N-dimethylformamide, 0.2 kg of sodium chloride and 0.2 kg of polydimethylsiloxane-b-polymethacrylic acid (molecular weight 306) were added into 6.7 kg of secondary deionized water for mixing and stirring to obtain a coal antioxidant composition S5; Based on the total weight of the coal antioxidant composition, the content of the primary antioxidant is 18 weight %, the content of the secondary antioxidant is 9 weight %, the content of the catalyst is 2 weight %, the content of the inorganic salt is 2 weight %, the content of the surfactant is 2 weight %, and the content of water is 67 weight %.

[0054] Example 6 The method for preparing the coal antioxidant composition S6 is the same as that in Example 1, except that the surfactant is a mixture of polydimethylsiloxane-b-polymethacrylic acid (molecular weight 306) and polydimethylsiloxane-b-polymethyl methacrylate (molecular weight 306), wherein the weight ratio of polydimethylsiloxane-b-polymethacrylic acid (molecular weight 306) to polydimethylsiloxane-b-polymethyl methacrylate (molecular weight 306) is 1.5:1; Based on the total weight of the coal antioxidant composition, the content of the primary antioxidant is 10 weight %, the content of the secondary antioxidant is 5 weight %, the content of the catalyst is 2 weight %, the content of the inorganic salt is 1 weight %, the content of the surfactant is 2 weight %, and the content of water is 80 weight %.

[0055] Example 7 The method for preparing the coal antioxidant composition S7 is the same as that in Example 1, except that the weight ratio of the total weight of the primary antioxidant, the secondary antioxidant and the catalyst to the weight of the surfactant is 5.67:1; Based on the total weight of the coal antioxidant composition, the content of the primary antioxidant is 10 weight %, the content of the secondary antioxidant is 5 weight %, the content of the catalyst is 2 weight %, the content of the inorganic salt is 1 weight %, the content of the surfactant is 3 weight %, and the content of water is 79 weight %.

[0056] Example 8 The method for preparing the coal antioxidant composition S8 is the same as that in Example 1, except that the weight ratio of the primary antioxidant to the secondary antioxidant is 1:1; Based on the total weight of the coal antioxidant composition, the content of the primary antioxidant is 10 weight %, the content of the secondary antioxidant is 10 weight %, the content of the catalyst is 2 weight %, the content of the inorganic salt is 1 weight %, the content of the surfactant is 2 weight %, and the content of water is 75 weight %.

[0057] Comparative Example 1 The method for preparing the coal antioxidant composition D1 comprises: 2.5 kg of dicyclopentadiene-p-cresol resin, 1.2 kg of tris(2,4-di-tert-butylphenyl)phosphite, 0.4 kg of N,N-dimethylformamide, 0.4 kg of sodium chloride and 0.5 kg of polydimethylsiloxane-b-polymethacrylic acid (molecular weight 306) were added into 5 kg of secondary deionized water and mixed and stirred to obtain a coal antioxidant composition S6; Based on the total weight of the coal antioxidant composition, the content of the primary antioxidant is 25 weight %, the content of the secondary antioxidant is 12 weight %, the content of the catalyst is 4 weight %, the content of the inorganic salt is 4 weight %, the content of the surfactant is 5 weight %, and the content of water is 50 weight %.

[0058] Comparative Example 2 The method for preparing the coal antioxidant composition D2 is the same as that of Example 5, except that an equal weight of tert-butylhydroquinone is used instead of dicyclopentadiene-p-cresol resin.

[0059] Comparative Example 3 The method for preparing the coal antioxidant composition D3 is the same as that of Example 5, except that an equal weight of dilauryl thiodipropionate is used instead of tri(2,4-di-tert-butylphenyl)phosphite.

[0060] Test Case Test Example 1 The coal antioxidant compositions S1-S8 in Examples 1-8, the coal antioxidant compositions D1-D3 in Comparative Examples 1-3, and the existing antioxidant compositions were mixed with water to prepare a 5% mass fraction coal antioxidant solution, the temperature of the coal antioxidant solution was 20°C; the coal antioxidant solution was sprayed on 100 kg of coal through the outlet pipe for antioxidant treatment for 8 hours, the weight of the remaining coal was weighed, and the antioxidant rate was calculated. Among them, the existing antioxidant composition was purchased from Dow Chemical Company, and the composition and content included: 20-30% by weight of inorganic antioxidant, 5-10% by weight of dispersant, and 60-75% by weight of softened water.

[0061] The antioxidant effect of the coal antioxidant composition is shown in Table 1.

[0062] Test Example 2 The coal antioxidant composition S1 in Example 1 was mixed with water to prepare a coal antioxidant solution with a mass fraction of 1%. The temperature of the coal antioxidant solution was 20°C. The coal antioxidant solution was sprayed on 100 kg of coal through a water outlet pipeline for antioxidant treatment for 8 hours, and the weight of the remaining coal was weighed to calculate the antioxidant rate.

[0063] The antioxidant effect of the coal antioxidant composition is shown in Table 2.

[0064] Test Example 3 The method for performing the antioxidant treatment is the same as that of Test Example 2, except that the temperature of the coal antioxidant solution is maintained at 35°C.

[0065] The antioxidant effect of the coal antioxidant composition is shown in Table 2.

[0066] Table 1 Antioxidant effects of the antioxidant compositions in the examples and comparative examples

[0067] Table 2 Antioxidant effect of the antioxidant composition in the test example

[0068] Wherein, the anti-oxidation rate = (mass of the coal sample after oxidation / total mass of the coal sample) × 100%.

[0069] As shown in Table 1, according to the comparison of the data in Examples 1 to 8 and Comparative Examples 1 to 4, it can be seen that the method disclosed herein can reduce the effect of coal oxidation. According to the comparison of the data in Example 1, Example 3 and Example 5, when the content of each component in the antioxidant composition is in a preferred range, the effect of coal oxidation can be reduced. According to the comparison of the data in Example 1 and Example 6, when the components and contents in the surfactant are in a suitable range, the effect of coal oxidation can be reduced. According to the comparison of the data in Example 1 and Example 7, when the weight ratio of the total weight of the primary antioxidant, the secondary antioxidant and the catalyst to the weight ratio of the surfactant is (8.5 to 15): 1, the effect of coal oxidation can be reduced. According to the comparison of the data in Example 1 and Example 8, when the weight ratio of the primary antioxidant to the secondary antioxidant is (1.5 to 3.0): 1, the effect of coal oxidation can be reduced. As shown in Table 2, based on the comparison of the data in Test Examples 1 to 3, when the weight ratio of the coal antioxidant composition to water is 3 to 10 weight % and the temperature of the coal antioxidant solution is maintained at 15 to 25° C., the effect of coal oxidation can be reduced.

[0070] The preferred embodiments of the present disclosure are described in detail above; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0071] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0072] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A coal antioxidant composition, characterized in that: The coal antioxidant composition comprises a primary antioxidant, a secondary antioxidant, a catalyst, an inorganic salt, a surfactant and water; The primary antioxidant includes a polymeric phenolic antioxidant; The secondary antioxidant includes a phosphite antioxidant; The inorganic salt includes sodium chloride; Based on the total weight of the coal antioxidant composition, the content of the primary antioxidant is 10-20% by weight, the content of the secondary antioxidant is 5-10% by weight, the content of the catalyst is 1-3% by weight, the content of the inorganic salt is 1-3% by weight, the content of the surfactant is 1-4% by weight, and the content of water is 60-82% by weight.

2. The coal antioxidant composition according to claim 1, characterized in that: Based on the total weight of the coal antioxidant composition, the content of the primary antioxidant is 13-18 weight %, the content of the secondary antioxidant is 6-9 weight %, the content of the catalyst is 2-2.5 weight %, the content of the inorganic salt is 1.5-2 weight %, the content of the surfactant is 2-3 weight %, and the content of water is 65-80 weight %.

3. The coal antioxidant composition according to claim 1, characterized in that: The catalyst includes one or more of triethylamine, N,N-dimethylformamide and thioacetamide.

4. The coal antioxidant composition according to claim 1, characterized in that: The surfactant includes a copolymer of polysiloxane and acrylic acid and / or a copolymer of polysiloxane and acrylate; The molecular weight of the copolymer in the surfactant is 300-400.

5. The coal antioxidant composition according to claim 1, characterized in that: The polymeric phenolic antioxidant includes dicyclopentadiene-p-cresol resin; The phosphite antioxidant includes tris(2,4-di-tert-butylphenyl)phosphite; The catalyst comprises one or a mixture of two of triethylamine, N,N-dimethylformamide and thioacetamide; The surfactant includes polydimethylsiloxane-b-polymethacrylic acid and / or polydimethylsiloxane-b-polymethyl methacrylate.

6. The coal antioxidant composition according to claim 1, characterized in that: The weight ratio of the total weight of the primary antioxidant, the secondary antioxidant and the catalyst to the weight of the surfactant is (8.5-15):

1.

7. The coal antioxidant composition according to claim 1, characterized in that: The weight ratio of the primary antioxidant to the secondary antioxidant is (1.5-3.0):

1.

8. A method for using a coal antioxidant composition, characterized in that: The method of use includes: The coal antioxidant composition according to any one of claims 1 to 7 is mixed with water to obtain a coal antioxidant solution; and the coal antioxidant solution is transported to various locations in a coal yard through a water outlet pipeline for coal antioxidant treatment.

9. The method of use according to claim 8, characterized in that: The weight ratio of the coal antioxidant composition to water is 3 to 10 weight %.

10. The method of use according to claim 8, characterized in that: When the coal antioxidant treatment is performed, the temperature of the coal antioxidant solution is maintained at 15-25°C.

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