Coal blending method based on content of gelatinous light and heavy phases

Abstract

This invention provides a coal blending method based on the light and heavy phase content of colloids, comprising: S1: extracting colloids from a single type of coal to obtain the light and heavy phases of the colloids, and calculating the light and heavy phase contents of the colloids; S2: the requirements for the light and heavy phase contents of colloids for different coal types are as follows: the light and heavy phase contents of coking coal are 0.5%-3.5% and 0.5%-4.0%, respectively; the light and heavy phase contents of 1 / 3 coking coal are 1.0%-3.0% and 0.5%-4.0%, respectively. The light phase content of coking coal is 8%-4.5%; the light phase content and heavy phase content of fat coal are 2.0%-5.0% and 1.5%-5.5% respectively; the light phase content and heavy phase content of gas coal are 0.5%-1.5% and 0.3%-1.2% respectively; the light phase content and heavy phase content of lean coal are 0.8%-1.8% and 0.5%-1.5% respectively. This invention uses the light phase content and heavy phase content of plastic mass to guide coal blending, effectively guiding coal blending and coking production, and improving coke quality.

Description

Technical Field

[0001] This invention relates to the field of coal blending technology, and in particular to a coal blending method based on the content of light and heavy phases of colloids. Background Technology

[0002] Coal plasticity refers to the formation of plastic bodies during the dry distillation process. These plastic bodies play a crucial role in the coking process, affecting the coking properties of coal and the quality of coke. They are also important parameters for guiding coal blending and predicting coke strength. Many factors influence the plastic body of coal, and adjusting these factors in coking production to keep the plastic body within a suitable range can improve coke quality.

[0003] Its performance indicators are mainly reflected in fluidity, adhesiveness, expansion and permeability, and plastic temperature range. In current research and application, the relationship between the fluidity of coal and the reactivity and post-reaction strength of coke within the thermoplastic range is parabolic. The reactivity of coke reaches its maximum when the fluidity is around 100 ddpm, and its minimum when the fluidity is around 200 ddpm. The change in post-reaction strength of coke is the opposite. The above studies are based on the characteristics of the fluidity of coal within the thermoplastic range. However, there is little research on the colloidal body (mobile phase) related to the fluidity of coal. Current research on colloidal bodies mainly focuses on the molecular weight of colloidal bodies, lacking an explanation of the structure of colloidal bodies. In guiding coal blending for coking production, the maximum thickness of the colloidal layer and the Gibbs freeness are mainly used to characterize the properties or content of liquid phase substances (colloids) during coal heating. There is no further research on the composition of colloidal bodies. However, fluidity can only reflect the corresponding fluidity of colloidal bodies at a certain temperature. Without a deep understanding of the properties of coking coal, it is impossible to accurately guide coal blending, thus resulting in relatively poor coke quality.

[0004] In the prior art, Chinese Patent Application No. 2022111103805 and Publication No. CN115449390A discloses a method for the separation and quantitative characterization of light and heavy phases of the colloidal binder phase in coal. This method includes: weighing multiple basic coal samples; leaving one coal sample unheated while heating the remaining samples; mixing the coal with acetone, filtering the separation liquid and solid phase to obtain a first extract and residual coal; centrifuging the first extract and collecting the supernatant as the light extract; drying and weighing the first residual coal, and calculating the extraction yield. The mass difference between the coal before and after extraction is considered as the mass of the light extract. The first raffinate is mixed with tetrahydrofuran, and the liquid and solid phases are separated by filtration to obtain the second extract and raffinate. The second extract is centrifuged, and the supernatant is taken as the heavy extract. The second raffinate is dried and weighed, and the mass difference between the coal before and after extraction is calculated as the mass of the heavy extract. The light and heavy extracts are analyzed by GC / MS to determine the mass percentage of the light and heavy phases. The mass percentage of the light and heavy phases is multiplied by the mass of the light and heavy extracts to obtain the mass of the light and heavy phases of the colloidal binder phase.

[0005] The aforementioned prior art can obtain the mass of the light and heavy phases of the colloidal binder phase, but it does not disclose how to use the mass of the light and heavy phases of the colloidal binder phase to guide coal coking production.

[0006] Therefore, a new technical solution is needed to solve the above-mentioned technical problems. Summary of the Invention

[0007] To address the aforementioned technical problems, this invention proposes a coal blending method based on the content of light and heavy phases in the colloid. This method guides coal blending based on the content of light and heavy phases in the colloid. By employing this method, a deeper understanding of the properties of coking coal can be achieved, effectively guiding coal blending and coking production and improving coke quality.

[0008] The specific details of the invention are as follows:

[0009] A coal blending method based on the light and heavy phase content of colloids includes the following steps:

[0010] S1: Extract the colloids from a single type of coal used in coking production to obtain the light phase and heavy phase of the colloids, and calculate the content of the light phase and the heavy phase of the colloids.

[0011] S2: Different coal types have different requirements for the content of light phase and heavy phase of colloids. The specific requirements are as follows, expressed as a percentage by mass:

[0012] The light phase content of the plastic mass in coking coal is 0.5%-3.5%, and the heavy phase content of the plastic mass in coking coal is 0.5%-4.0%.

[0013] The light phase content of plastic mass in 1 / 3 coking coal is 1.0%-3.0%, and the heavy phase content of plastic mass in 1 / 3 coking coal is 0.8%-4.5%.

[0014] The content of the light phase of the plastic mass in coking coal is 2.0%-5.0%, and the content of the heavy phase of the plastic mass in coking coal is 1.5%-5.5%.

[0015] The light phase content of the plastic mass in the gas coal is 0.5%-1.5%, and the heavy phase content of the plastic mass in the gas coal is 0.3%-1.2%.

[0016] The light phase content of the plastic mass in lean coal is 0.8%-1.8%, and the heavy phase content of the plastic mass is 0.5%-1.5%.

[0017] As a preferred option, the strength of the coke after reaction should be greater than or equal to 64%.

[0018] The light phase content of the plastic mass in coking coal is 2.5%-3.5%, and the heavy phase content of the plastic mass in coking coal is 3.0%-4.0%.

[0019] The light phase content of plastic mass in 1 / 3 coking coal is 2.0%-3.0%, and the heavy phase content of plastic mass in 1 / 3 coking coal is 2.5%-4.5%.

[0020] The content of the light phase of the plastic mass in coking coal is 3.0%-5.0%, and the content of the heavy phase of the plastic mass in coking coal is 3.5%-5.5%.

[0021] The light phase content of the plastic mass in the gas coal is 1.0%-1.5%, and the heavy phase content of the plastic mass in the gas coal is 0.6%-1.2%.

[0022] The light phase content of the plastic mass in lean coal is 1.2%-1.8%, and the heavy phase content of the plastic mass is 0.8%-1.5%.

[0023] As a preferred option, S3 is also included, in which, when coking coal, 1 / 3 coking coal, fat coal, gas coal and lean coal are blended for coking, the content of the light phase of the plastic mass in the blended coal is 1.5%-3.5%, and the content of the heavy phase of the plastic mass in the blended coal is 2.5%-4.0%.

[0024] As a preferred option, when the strength of the coke after reaction is greater than or equal to 64%, the content of the light phase of the plastic body in the blended coal is 2.5%-3.5%, and the content of the heavy phase of the plastic body in the blended coal is 3.0%-4.0%.

[0025] As a preferred embodiment, step S1 specifically includes the following steps:

[0026] S11: Single type of coal used in coking production is dried, crushed, heated in an inert atmosphere, and then cooled to room temperature in an inert atmosphere;

[0027] S12: Weigh a certain amount of coal sample cooled to room temperature and add it to a container containing a certain amount of acetone. Mix the coal sample and acetone thoroughly to ensure that the colloidal substances in the coal sample are fully incorporated into the acetone.

[0028] S13: The well-mixed coal sample and acetone solution are subjected to liquid-phase and solid-phase separation to obtain solid residual coal 1 and extract 1;

[0029] S14: Centrifuge the extract and take out the supernatant. The supernatant is the light phase containing colloidal particles. Dry the remaining solid coal and weigh it. The difference between the weight of the solid coal and the original coal sample is the content of the light phase containing colloidal particles.

[0030] S15: Add the dried solid coal residue from S14 to tetrahydrofuran and mix evenly. Separate the solid and liquid phases to obtain solid coal residue 2 and extract 2.

[0031] S16: Centrifuge the second extract and take out the supernatant. The supernatant is the heavy phase containing colloids. Dry the second solid coal residue and weigh it. The difference between the weight and the weight of the second solid coal residue and the first solid coal residue after drying is the content of the heavy phase containing colloids.

[0032] As a preferred option, the single type of coal used in coking production in S11 is dried and then crushed to below 0.2mm.

[0033] As a preferred option, in S11, the temperature is raised to 500°C in an inert atmosphere.

[0034] As a preferred option, the separation of the liquid phase and the solid phase in S13 is achieved by vacuum filtration.

[0035] As a preferred option, the separation of the liquid phase and the solid phase in S15 is achieved by vacuum filtration.

[0036] As a preferred option, the weight-to-volume ratio of solid residual coal to tetrahydrofuran in S15 is 1:10, and the mixture is heated in a water bath at 50℃-70℃ for 1-2 hours.

[0037] This invention uses the content of light phase and heavy phase of plastic mass to guide coal blending, which can provide an in-depth understanding of the properties of coking coal, effectively guide coal blending and coking production, and improve coke quality. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1The correlation between the content of colloidal light phase and the thermal properties of coke;

[0040] Figure 2 The correlation between the content of the gelatinous body phase and the thermal properties of coke. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to specific examples and the accompanying drawings.

[0042] It should be noted that all expressions such as "a" and "b" used in the embodiments of the present invention are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "a" and "b" are only for the convenience of expression and should not be construed as limiting the embodiments of the present invention. Subsequent embodiments will not explain this in detail.

[0043] An embodiment of the present invention provides a coal blending method based on the light and heavy phase content of colloids, comprising the following steps:

[0044] S1: Extract the colloids from a single type of coal used in coking production to obtain the light phase (light phase of the colloid binder) and heavy phase (heavy phase of the colloid binder), and calculate the contents of the light phase (light phase of the colloid binder) and the heavy phase (heavy phase of the colloid binder); more specifically:

[0045] S11: Single type of coal for coking production is dried, crushed to below 0.2mm, heated to 500℃ in an inert atmosphere, and then cooled to room temperature in an inert atmosphere;

[0046] S12: Weigh a certain amount of coal sample cooled to room temperature and add it to a container containing a certain amount of acetone. Mix the coal sample and acetone thoroughly to ensure that the colloidal substances in the coal sample are fully incorporated into the acetone.

[0047] S13: The well-mixed coal sample and acetone solution are separated into liquid and solid phases by vacuum filtration to obtain solid residual coal 1 and extract 1.

[0048] S14: Centrifuge the extract and take out the supernatant. The supernatant is the light phase containing colloidal particles. Dry the remaining solid coal and weigh it. The difference between the weight of the solid coal and the original coal sample is the content of the light phase containing colloidal particles.

[0049] S15: Add the dried solid coal residue from S14 to tetrahydrofuran and mix evenly. Separate the solid and liquid phases by vacuum filtration to obtain solid coal residue 2 and extract 2.

[0050] S16: Centrifuge the second extract and take out the supernatant. The supernatant is the heavy phase containing colloids. Dry the second solid coal residue and weigh it. The difference between the weight and the weight of the second solid coal residue and the first solid coal residue after drying is the content of the heavy phase containing colloids.

[0051] S2: Different coal types have different requirements for the light phase content and heavy phase content of the colloid. Specifically, the calculated light phase content and heavy phase content of the colloid correspond to different coal types. The specific requirements are as follows, expressed as a percentage by mass:

[0052] The light phase content of the plastic mass in coking coal is 0.5%-3.5%, and the heavy phase content of the plastic mass in coking coal is 0.5%-4.0%.

[0053] The light phase content of plastic mass in 1 / 3 coking coal is 1.0%-3.0%, and the heavy phase content of plastic mass in 1 / 3 coking coal is 0.8%-4.5%.

[0054] The content of the light phase of the plastic mass in coking coal is 2.0%-5.0%, and the content of the heavy phase of the plastic mass in coking coal is 1.5%-5.5%.

[0055] The light phase content of the plastic mass in the gas coal is 0.5%-1.5%, and the heavy phase content of the plastic mass in the gas coal is 0.3%-1.2%.

[0056] The light phase content of the plastic mass in lean coal is 0.8%-1.8%, and the heavy phase content of the plastic mass is 0.5%-1.5%.

[0057] Furthermore, when a high strength (≥64%) is required for the coke after reaction, the light and heavy phase content requirements for each type of coal are as follows:

[0058] The light phase content of the plastic mass in coking coal is 2.5%-3.5%, and the heavy phase content of the plastic mass in coking coal is 3.0%-4.0%.

[0059] The light phase content of plastic mass in 1 / 3 coking coal is 2.0%-3.0%, and the heavy phase content of plastic mass in 1 / 3 coking coal is 2.5%-4.5%.

[0060] The content of the light phase of the plastic mass in coking coal is 3.0%-5.0%, and the content of the heavy phase of the plastic mass in coking coal is 3.5%-5.5%.

[0061] The light phase content of the gas coal is 1.0%-1.5%, and the heavy phase content of the gas coal is 0.6%-1.2%.

[0062] The content of the light phase of the plastic mass in lean coal is 1.2%-1.8%, and the content of the heavy phase of the plastic mass in lean coal is 0.8%-1.5%.

[0063] Including S3, when using any combination of coking coal, 1 / 3 coking coal, fat coal, gas coal, and lean coal for coking, the content of the light phase and heavy phase of the plastic mass in the blended coal must be within the corresponding ranges. Specifically, the content of the light phase of the plastic mass in the blended coal should be 1.5%–3.5%, and the content of the heavy phase of the plastic mass in the blended coal should be 2.5%–4.0%. When a higher strength (≥64%) is required after the coke reaction, the content of the light phase of the plastic mass in the blended coal should be 2.5%–3.5%, and the content of the heavy phase of the plastic mass in the blended coal should be 3.0%–4.0%.

[0064] This invention uses the content of light phase and heavy phase of plastic mass to guide coal blending, which can provide an in-depth understanding of the properties of coking coal, effectively guide coal blending and coking production, and improve coke quality.

[0065] Example 1:

[0066]

[0067]

[0068] As shown in Table 1, this embodiment provides a specific application scenario:

[0069] Table 1

[0070] As shown in Table 1, this embodiment provides three different blending schemes for Sichuan-Chongqing 1 / 3 coal, Yunnan-Guizhou fat coal, mining bureau coking coal, Yunnan-Guizhou coking coal, gas coal, and lean coal. In Scheme 1, the blending ratios of Sichuan-Chongqing 1 / 3 coal, Yunnan-Guizhou fat coal, mining bureau coking coal, Yunnan-Guizhou coking coal, gas coal, and lean coal are 15, 35, 5, 32, 5, and 8, respectively. The coke reactivity (CRI) after blending is 23.6%, and the coke strength after reaction (CS) is... The reactivity ratio (CRI) of the blended coal is 66.3%; in Scheme 2, the proportions of Sichuan-Chongqing 1 / 3 coal, Yunnan-Guizhou fat coal, mining bureau coking coal, Yunnan-Guizhou coking coal, gas coal, and lean coal are 20, 22, 10, 30, 10, and 8, respectively, resulting in a coke reactivity ratio (CRI) of 25.4% and a coke reactivity strength (CSR) of 65.3%; in Scheme 3, the proportions of Sichuan-Chongqing 1 / 3 coal, Yunnan-Guizhou fat coal, mining bureau coking coal, Yunnan-Guizhou coking coal, gas coal, and lean coal are 2... The coke reactivity (CRI) after blending is 27.4% for coals of 0, 15, 15, 25, 10, and 15, and the coke reactivity strength (CSR) is 58.6%. Among the three schemes, the light phase and heavy phase contents of the plastic mass in Sichuan-Chongqing 1 / 3 coal are the same, at 2.2% and 2.6% respectively; the light phase and heavy phase contents of the plastic mass in Yunnan-Guizhou fat coal are the same, at 3.4% and 4.4% respectively; the light phase and heavy phase contents of the plastic mass in mining bureau coking coal are the same, at 1.2% and 1.6% respectively; the light phase and heavy phase contents of the plastic mass in Yunnan-Guizhou coking coal are the same, at 2.6% and 2.8% respectively; the light phase and heavy phase contents of the plastic mass in gas coal are the same, at 1.2% and 0.8% respectively; and the light phase and heavy phase contents of the plastic mass in lean coal are the same, at 1.5% and 1.2% respectively.

[0071] As shown in Table 1, after adopting this method, the coke reactivity (CRI) of all three schemes is less than 30%, which is low and conducive to reducing the coke ratio; and the post-reaction strength (CSR) of the coke of all three schemes is around 60%, which prevents furnace collapse. Based on the specific data, it can be clearly seen that the coke produced by blending coal using this method has higher quality.

[0072] It should be noted that the components or steps in the above embodiments can be interchanged, substituted, added, or deleted. Therefore, the combinations formed by these reasonable permutations and transformations should also fall within the protection scope of this invention, and the protection scope of this invention should not be limited to the above embodiments.

[0073] The above are exemplary embodiments disclosed in this invention. The order of the disclosed embodiments is merely for descriptive purposes and does not represent the superiority or inferiority of the embodiments. However, it should be noted that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the disclosed embodiments of this invention (including the claims) is limited to these examples. Various changes and modifications can be made without departing from the scope defined by the claims. The functions, steps, and / or actions of the methods according to the disclosed embodiments described herein do not need to be performed in any particular order. Furthermore, although the elements disclosed in the embodiments of this invention may be described or claimed individually, they may be understood as multiple unless explicitly limited to a singular.

[0074] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples. Within the framework of the invention, technical features of the above embodiments or different embodiments can be combined, and many other variations of the different aspects of the invention as described above exist, which are not provided in the details for the sake of brevity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the protection scope of the invention.

Claims

1. A coal blending method based on the light and heavy phase content of colloids, characterized in that, Includes the following steps: S1: Extract the colloids from a single type of coal used in coking production to obtain the light phase and heavy phase of the colloids, and calculate the content of the light phase and the heavy phase of the colloids. S2: Different coal types have different requirements for the content of light phase and heavy phase of colloids. The specific requirements are as follows, expressed as a percentage by mass: The light phase content of plastic mass in coking coal is 0.5%-3.5%, and the heavy phase content of plastic mass in coking coal is 0.5%-4.0%. The light phase content of plastic mass in 1 / 3 coking coal is 1.0%-3.0%, and the heavy phase content of plastic mass in 1 / 3 coking coal is 0.8%-4.5%. The light phase content of the plastic mass in coking coal is 2.0%-5.0%, and the heavy phase content of the plastic mass is 1.5%-5.5%. The light phase content of the plastic mass in the gas coal is 0.5%-1.5%, and the heavy phase content of the plastic mass in the gas coal is 0.3%-1.2%. The light phase content of the plastic mass in lean coal is 0.8%-1.8%, and the heavy phase content of the plastic mass is 0.5%-1.5%. S1 specifically includes the following steps: S11: Single type of coal used in coking production is dried, crushed, heated in an inert atmosphere, and then cooled to room temperature in an inert atmosphere; S12: Weigh a certain amount of coal sample cooled to room temperature and add it to a container containing a certain amount of acetone. Mix the coal sample and acetone thoroughly to ensure that the colloidal substances in the coal sample are fully incorporated into the acetone. S13: The well-mixed coal sample and acetone solution are subjected to liquid-phase and solid-phase separation to obtain solid residual coal 1 and extract 1; S14: Centrifuge the extract and take out the supernatant. The supernatant is the light phase containing colloidal particles. Dry the remaining solid coal and weigh it. The difference between the weight of the solid coal and the original coal sample is the content of the light phase containing colloidal particles. S15: Add the dried solid coal residue from S14 to tetrahydrofuran and mix evenly. Separate the solid and liquid phases to obtain solid coal residue 2 and extract 2. S16: Centrifuge the second extract and take out the supernatant. The supernatant is the heavy phase containing colloids. Dry the second solid coal residue and weigh it. The difference between the weight and the weight of the second solid coal residue and the first solid coal residue after drying is the content of the heavy phase containing colloids.

2. The coal blending method based on the light and heavy phase content of colloids according to claim 1, characterized in that, When the strength of the coke after reaction is required to be greater than or equal to 64%: The light phase content of plastic mass in coking coal is 2.5%-3.5%, and the heavy phase content of plastic mass in coking coal is 3.0%-4.0%. The light phase content of plastic mass in 1 / 3 coking coal is 2.0%-3.0%, and the heavy phase content of plastic mass in 1 / 3 coking coal is 2.5%-4.5%. The light phase content of the plastic mass in coking coal is 3.0%-5.0%, and the heavy phase content of the plastic mass in coking coal is 3.5%-5.5%. The light phase content of the plastic mass in the gas coal is 1.0%-1.5%, and the heavy phase content of the plastic mass in the gas coal is 0.6%~1.2%. The content of light phase of plastic mass in lean coal is 1.2%-1.8%, and the content of heavy phase of plastic mass in lean coal is 0.8%-1.5%.

3. The coal blending method based on the light and heavy phase content of colloids according to claim 1, characterized in that, It also includes S3, which uses any combination of coking coal, 1 / 3 coking coal, fat coal, gas coal and lean coal for coking, with the light phase content of the blended coal being 1.5%-3.5% and the heavy phase content of the blended coal being 2.5%-4.0%.

4. A coal blending method based on the light and heavy phase content of colloids according to claim 3, characterized in that, When the strength of coke after reaction is required to be greater than or equal to 64%, the content of light phase of plastic mass in the blended coal should be 2.5%-3.5%, and the content of heavy phase of plastic mass in the blended coal should be 3.0%-4.0%.

5. A coal blending method based on the light and heavy phase content of colloids according to claim 1, characterized in that, S11 coal used in coking production is dried and then crushed to below 0.2mm.

6. A coal blending method based on the light and heavy phase content of colloids according to claim 1, characterized in that, In S11, the temperature is raised to 500°C in an inert atmosphere.

7. A coal blending method based on the light and heavy phase content of colloids according to claim 1, characterized in that, In S13, the liquid phase and solid phase are separated by vacuum filtration.

8. A coal blending method based on the light and heavy phase content of colloids according to claim 1, characterized in that, In S15, the liquid phase and solid phase are separated by vacuum filtration.

9. A coal blending method based on the light and heavy phase content of colloids according to claim 1, characterized in that, The weight-to-volume ratio of solid residual coal to tetrahydrofuran in S15 is 1:

10. When mixed, the mixture is heated in a water bath at 50℃-70℃ for 1-2 hours.

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