Method for predicting plastic temperature zone of coal as fired by using crosslinking index and aromaticity
By introducing the crosslinking index and aromaticity, the plastic temperature zone of the coal fed into the furnace is calculated using the formula PR=431.76fa+73.5AlB-306.8. This solves the problems of low efficiency and low model accuracy of traditional measurement methods, and realizes rapid and accurate prediction of the plastic temperature zone. It is applicable to a variety of coal types and reduces production costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-30
- Publication Date
- 2026-04-03
AI Technical Summary
Existing technologies are inefficient and costly in determining the plastic temperature zone of coal entering the furnace. Traditional experimental methods are time-consuming and complex to operate. The models have low prediction accuracy and poor universality, which cannot meet the needs of real-time control and adaptability to different coal types.
By introducing two coal molecular structure parameters, crosslinking index and aromaticity, the plastic temperature range of the coal fed into the furnace is calculated using the formula PR=431.76fa+73.5AlB-306.8. Combined with a rapid detection method, a prediction model based on molecular structure is established.
It significantly shortens the detection cycle, improves prediction accuracy to ≤10%, has strong applicability, covers a variety of coal types, reduces production costs, and provides a reliable basis for process adjustment.
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Abstract
Description
Technical Field
[0001] This invention belongs to the field of coal processing technology, specifically a method for predicting the plastic temperature range of coal fed into the furnace using crosslinking index and aromaticity. Background Technology
[0002] In coking processes, the plastic temperature range of the coal fed into the furnace directly affects the structural density, strength, and shatter resistance of the coke. A narrow plastic temperature range leads to insufficient bonding between coal particles, resulting in coke cracks; a wide range, on the other hand, can cause uneven shrinkage of the coke cake, affecting the lifespan of the coke oven. Currently, the determination of the plastic temperature range of coal fed into the furnace in industrial production mainly relies on traditional experimental methods, including the Gaussian method, the Oya expansion method, and the Gibbs free flow method. These methods directly measure the softening point, solidification point, and related plasticity indicators of coal during pyrolysis by heating the coal sample, thereby determining the plastic temperature range. However, with the diversification of coal resources and the increasing demand for process optimization in industry, the limitations of traditional experimental methods are becoming increasingly apparent. They involve long experimental cycles, making it impossible to meet real-time control requirements; high sample consumption and high experimental costs; and high operational complexity, requiring highly skilled personnel.
[0003] Meanwhile, research has also been conducted on prediction methods based on the correlation of coal quality parameters. These methods attempt to establish correlation models between industrial analysis indicators (such as ash content, volatile matter, and fixed carbon content) or elemental analysis indicators (such as C, H, and O content) and the plastic temperature range, thereby achieving indirect prediction of the plastic temperature range. However, existing prediction methods suffer from unclear mechanisms, weak correlations, poor universality, insufficient adaptability to different coal types, poor model robustness, and weak resistance to interference. Summary of the Invention
[0004] This invention overcomes the shortcomings of existing technologies and proposes a method for predicting the plastic temperature zone of coal fed into the furnace using crosslinking index and aromaticity. This method solves the problems of low efficiency and high cost of traditional experimental determination methods by introducing two coal molecular structure parameters, crosslinking index and aromaticity; it also solves the problems of poor universality and low prediction accuracy of existing correlation prediction methods; and it solves the problems of unclear correlation between molecular structure parameters and plastic temperature zone and insufficient model generalization ability.
[0005] This invention is achieved through the following technical solution: A method for predicting the plastic temperature zone of coal fed into a furnace using crosslinking index and aromaticity includes the following steps: S1. Calculate the aromaticity f of the coal fed into the furnace. a and crosslinking index Al B ; S2, Aroma f a and crosslinking index Al B Substituting into the following formula: PR = 431.76f a +73.5AlB -306.8; The calculated PR is the plastic temperature range exhibited by the coal during the coking process.
[0006] Furthermore, the aroma content f is calculated using the volatile matter content and carbon content of the coal fed into the furnace. a ;f a Calculated using the following formula: ; C daf V represents the carbon content of the coal fed into the furnace. daf This refers to the volatile matter content of the coal fed into the furnace.
[0007] Furthermore, the crosslinking index Al of the coal fed into the furnace was calculated using sulfur content, oxygen content, carbon content, and aromaticity. B Al B Calculated using the following formula: ; C daf The carbon content of the coal fed into the furnace, O daf S represents the oxygen content of the coal fed into the furnace. daf This refers to the sulfur content of the coal fed into the furnace.
[0008] Furthermore, the volatile matter content V daf Determined according to the national standard GB / T 212-2008 Industrial Analysis Methods for Coal.
[0009] Furthermore, the carbon content C daf Oxygen content daf Sulfur content S daf Elemental analysis of coal was performed according to the national standard GB / T31391-2015.
[0010] Furthermore, the predicted value PR calculated in step S2 is compared with the measured plastic temperature range of Gibbs flowability to calculate the error value.
[0011] Furthermore, the measured value of the plasticity temperature PR was determined according to the national standard GB / T 25213-2010 Coal Plasticity Determination Constant Torque Gibbs Plasticity Tester Method.
[0012] The beneficial effects of this invention compared to the prior art are as follows: 1. Significantly shortened detection cycle: This invention can output the plastic temperature range by rapidly detecting the crosslinking index and aromaticity of coal and combining it with a pre-built model, which shortens the detection cycle by more than 90% compared with the traditional Gibbs flowability method, and solves the problem of delayed process adjustment when coal type changes or coal quality fluctuates.
[0013] 2. Significantly improved prediction accuracy: The core parameters, crosslinking index and aromaticity, directly characterize the essential mechanisms of plasticity generation during coal pyrolysis, such as molecular chain depolymerization-crosslinking and aromatic ring polymerization. The prediction error has been reduced from ≥15% in existing models to ≤10%, meeting the core accuracy requirements of processes such as coking and gasification. This provides a reliable basis for quality control and process adjustment in the production process, effectively improving product quality and reducing production costs.
[0014] 3. Enhanced universality and anti-interference ability: The model is based on the essential correlation of molecular structure and covers different coal types such as bituminous coal, lignite, and lean coal (the differences in molecular structure are quantified by cross-linking index and aromaticity). The prediction error for unfamiliar coal types is still ≤12%, which greatly improves the generalization ability compared with the existing model (which only adapts to a single coal type). Detailed Implementation
[0015] To make the technical problem to be solved, the technical solution, and the beneficial effects of the present invention clearer, the present invention will be further described in detail with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solution of the present invention will be described in detail below with reference to embodiments, but the scope of protection is not limited thereto. Example 1
[0016] This embodiment proposes a method for predicting the plastic temperature range of coal entering the furnace using crosslinking index and aromaticity, specifically comprising the following steps: S1. Determine the volatile matter content, carbon content, sulfur content, and oxygen content of the coal fed into the furnace; volatile matter content V daf According to the national standard GB / T 212-2008 Industrial Analysis Methods for Coal, the carbon content (C) was determined. daf Oxygen content daf Sulfur content S daf The volatile matter content V was determined according to the national standard GB / T 31391-2015, "Elemental Analysis Methods for Coal". In this embodiment, Zhaocheng coal was used as the research object, and its volatile matter content V was measured. daf =35.56 wt.%, carbon content is C daf =81.09 wt.%, sulfur content is S daf =1.01 wt.%, oxygen content is O daf =2.195wt.%; S2. Calculate the aromaticity f using the volatile matter content and carbon content of the coal fed into the furnace. a ;f a Calculated using the following formula: ; The aromaticity f of Zhaocheng coal was calculated. a =0.769; S3. The crosslinking index Al of the coal fed into the furnace is calculated based on the sulfur content, oxygen content, carbon content, and aromaticity. B Al B Calculated using the following formula: ; The crosslinking index of Zhaocheng coal was calculated to be Al. B =0.913; S4. Aromaticity f a and crosslinking index Al B Substituting into the following formula: PR = 431.76f a +73.5Al B -306.8; The calculated PR is the plastic temperature range exhibited by the coal during the coking process; the predicted plastic temperature range value for Zhaocheng coal is PR. 预测 =92.33 o C; S5. Compare the predicted value PR with the measured plasticity temperature range of the Gibbs free flow. The measured value of PR in the plasticity temperature range was determined according to the national standard GB / T 25213-2010, "Determination of Plasticity of Coal - Constant Torque Gibbs Plasticity Tester Method." The measured result is as follows: The measured value of the plastic temperature range for Zhaocheng coal is PR = 88.26. o C; The absolute error is X = |92.33 - 88.26| = 4.07 o C; After comparison, the method used in this invention has high prediction accuracy and strong applicability to different coal types, and will not experience significant fluctuations due to changes in coal type, coal blending scheme, and coke oven properties. The method for predicting the plastic temperature range of coal fed into the furnace in this invention specifically considers the influence of coal molecular structure characteristics on the plastic temperature range, resulting in more scientific and accurate predictions. Furthermore, it expands the range of coking coals and reduces coal blending costs. Example 2
[0017] This embodiment proposes a method for predicting the plastic temperature range of coal entering the furnace using crosslinking index and aromaticity, specifically comprising the following steps: S1. Determine the volatile matter content, carbon content, sulfur content, and oxygen content of the coal fed into the furnace; volatile matter content V daf According to the national standard GB / T 212-2008 Industrial Analysis Methods for Coal, the carbon content (C) was determined. daf Oxygen content daf Sulfur content S daf The volatile matter content V was determined according to the national standard GB / T 31391-2015, "Elemental Analysis Methods for Coal". In this embodiment, Zhaocheng coal was used as the research object, and its volatile matter content V was measured. daf=24.98 wt.%, carbon content is C daf =86.76 wt.%, sulfur content is S daf =1.14 wt.%, oxygen content is O daf =2.778wt.%; S2. Calculate the aromaticity f using the volatile matter content and carbon content of the coal fed into the furnace. a ;f a Calculated using the following formula: ; The aromaticity f of Zhaocheng coal was calculated. a =0.837; S3. The crosslinking index Al of the coal fed into the furnace is calculated based on the sulfur content, oxygen content, carbon content, and aromaticity. B Al B Calculated using the following formula: ; The crosslinking index of Zhaocheng coal was calculated to be Al. B =0.736; S4. Aromaticity f a and crosslinking index Al B Substituting into the following formula: PR = 431.76f a +73.5Al B -306.8; The calculated PR is the plastic temperature range exhibited by the coal during the coking process; the predicted plastic temperature range value for Zhaocheng coal is PR. 预测 =108.7 o C; S5. Compare the predicted value PR with the measured plasticity temperature range of the Gibbs free flow. The measured value of PR in the plasticity temperature range was determined according to the national standard GB / T 25213-2010, "Determination of Plasticity of Coal - Constant Torque Gibbs Plasticity Tester Method." The measured result is as follows: The measured value of the plastic temperature range for Zhaocheng coal is PR = 106.2. o C; The absolute error is X = |108.7 - 106.2| = 2.5 o C; After comparison, the method used in this invention has high prediction accuracy and strong applicability to different coal types, and will not experience significant fluctuations due to changes in coal type, coal blending scheme, and coke oven properties. The method for predicting the plastic temperature range of coal fed into the furnace in this invention specifically considers the influence of coal molecular structure characteristics on the plastic temperature range, resulting in more scientific and accurate predictions. Furthermore, it expands the range of coking coals and reduces coal blending costs. Example 3
[0018] This embodiment proposes a method for predicting the plastic temperature range of coal entering the furnace using crosslinking index and aromaticity, specifically comprising the following steps: S1. Determine the volatile matter content, carbon content, sulfur content, and oxygen content of the coal fed into the furnace; volatile matter content V daf According to the national standard GB / T 212-2008 Industrial Analysis Methods for Coal, the carbon content (C) was determined. daf Oxygen content daf Sulfur content S daf The volatile matter content V was determined according to the national standard GB / T 31391-2015, "Elemental Analysis Methods for Coal". In this embodiment, Zhaocheng coal was used as the research object, and its volatile matter content V was measured. daf =36.69 wt.%, carbon content is C daf =85.46 wt.%, sulfur content is S daf =0.57wt.%, oxygen content is O daf =2.308wt.%; S2. Calculate the aromaticity f using the volatile matter content and carbon content of the coal fed into the furnace. a ;f a Calculated using the following formula: ; The aromaticity f of Zhaocheng coal was calculated. a =0.717; S3. The crosslinking index Al of the coal fed into the furnace is calculated based on the sulfur content, oxygen content, carbon content, and aromaticity. B Al B Calculated using the following formula: ; The crosslinking index of Zhaocheng coal was calculated to be Al. B =0.953; S4. Aromaticity f a and crosslinking index Al B Substituting into the following formula: PR = 431.76f a +73.5Al B -306.8; The calculated PR is the plastic temperature range exhibited by the coal during the coking process; the predicted plastic temperature range value for Zhaocheng coal is PR. 预测 =72.8 o C; S5. Compare the predicted value PR with the measured plasticity temperature range of the Gibbs free flow. The measured value of PR in the plasticity temperature range was determined according to the national standard GB / T 25213-2010, "Determination of Plasticity of Coal - Constant Torque Gibbs Plasticity Tester Method." The measured result is as follows: The measured value of the plastic temperature range for Zhaocheng coal is PR = 74.1. o C; The absolute error is X = |74.1 - 76.8| = 2.7 o C; After comparison, the method used in this invention has high prediction accuracy and strong applicability to different coal types, and will not experience significant fluctuations due to changes in coal type, coal blending scheme, and coke oven properties. The method for predicting the plastic temperature range of coal fed into the furnace in this invention specifically considers the influence of coal molecular structure characteristics on the plastic temperature range, resulting in more scientific and accurate predictions. Furthermore, it expands the range of coking coals and reduces coal blending costs.
[0019] This invention breaks through the existing framework that relies on macroscopic composition or direct experimental measurement, and for the first time clearly defines crosslinking index and aromaticity as core molecular parameters for predicting the plastic temperature zone of coal entering the furnace: the crosslinking index directly quantifies the dynamic process of "molecular chain breaking - free radical crosslinking" in coal pyrolysis, and accurately corresponds to the solidification point of the plastic temperature zone (dominated by crosslinking reaction); aromaticity characterizes the density and stability of aromatic rings in coal molecules, and is directly related to the softening point of the plastic temperature zone (dominated by aromatic ring depolymerization); the two together construct the essential correlation between "molecular structure - macroscopic plasticity", solving the problem of "mechanistic discontinuity" in the existing technology.
[0020] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.
[0021] The detailed descriptions listed above are merely specific descriptions of feasible implementation methods of this application and are not intended to limit the scope of protection of this application. All equivalent implementation methods or modifications made without departing from the spirit of the art of this application should be included within the scope of protection of this invention.
Claims
1. A method for predicting the plastic temperature range of coal fed into a furnace using crosslinking index and aromaticity, characterized in that, Includes the following steps: S1. Calculate the aromaticity f of the coal fed into the furnace. a and crosslinking index Al B ; S2, Aroma f a and crosslinking index Al B Substituting into the following formula: PR = 431.76f a +73.5Al B -306.8; The calculated PR is the plastic temperature range exhibited by the coal during the coking process.
2. The method for predicting the plastic temperature zone of coal fed into the furnace using crosslinking index and aromaticity according to claim 1, characterized in that, The aroma content f is calculated by analyzing the volatile matter and carbon content of the coal fed into the furnace. a ;f a Calculated using the following formula: ； C daf V represents the carbon content of the coal fed into the furnace. daf This refers to the volatile matter content of the coal fed into the furnace.
3. The method for predicting the plastic temperature zone of coal fed into the furnace using crosslinking index and aromaticity according to claim 1, characterized in that, The crosslinking index Al of the coal fed into the furnace was calculated using sulfur content, oxygen content, carbon content, and aromaticity. B Al B Calculated using the following formula: ； C daf The carbon content of the coal fed into the furnace, O daf S represents the oxygen content of the coal fed into the furnace. daf This refers to the sulfur content of the coal fed into the furnace.
4. The method for predicting the plastic temperature zone of coal fed into the furnace using crosslinking index and aromaticity according to claim 2, characterized in that, Volatile content V daf Determined according to the national standard GB / T 212-2008 Industrial Analysis Methods for Coal.
5. The method for predicting the plastic temperature zone of coal fed into the furnace using crosslinking index and aromaticity according to claim 3, characterized in that, Carbon content C daf Oxygen content daf Sulfur content S daf Elemental analysis of coal was performed according to the national standard GB / T 31391-2015.
6. The method for predicting the plastic temperature zone of coal fed into the furnace using crosslinking index and aromaticity according to claim 1, characterized in that, The predicted value PR calculated in step S2 is compared with the measured plastic temperature range of Gibbs flowability, and the error value is calculated.
7. The method for predicting the plastic temperature zone of coal fed into the furnace using crosslinking index and aromaticity according to claim 6, characterized in that, The measured value of the plasticity temperature PR was determined according to the national standard GB / T 25213-2010 Coal Plasticity Determination Constant Torque Gibbs Plasticity Tester Method.