Method for predicting maximum fluidity of coal as fired by using fatty hydrogen content

Abstract

The invention discloses a method for predicting the maximum fluidity of coal as fired by using the content of fatty hydrogen, and belongs to the technical field of coal coking. According to the method, the fat hydrogen content of the coal as fired is measured and analyzed, and the correlation model between the fat hydrogen content and the maximum fluidity is established, so that accurate prediction of the maximum fluidity of the coal as fired is realized; according to the method, the fat hydrogen content is used as a key index for predicting the maximum fluidity, and the limitation of the traditional method depending on indexes such as the maximum thickness Y value and the caking index G of a gelatinous layer is broken through; the fatty hydrogen content can more directly reflect the condition of active groups in a coal molecular structure, and is closely related to the caking property of the coal, so that the prediction result is more accurate and reliable; the problems that an existing method for predicting the maximum fluidity of coal as fired is complex in operation and large in error are solved.

Description

Technical Field

[0001] This invention belongs to the field of coal coking technology, specifically a method for predicting the maximum fluidity of coal fed into the furnace using fatty hydrogen content. Background Technology

[0002] In the coking industry, the maximum fluidity of coal fed into the furnace is one of the important indicators for measuring the caking performance of coal, and it plays a decisive role in the quality of the produced coke. Accurately determining the maximum fluidity of coal fed into the furnace can optimize coal blending, improve coke quality, reduce production costs, and at the same time reduce environmental pollution.

[0003] Currently, traditional methods for predicting the maximum fluidity of coal fed into the furnace mainly rely on indicators such as the maximum thickness of the plastic layer (Y value) and the caking index (G). However, these methods have many limitations. On the one hand, the determination of the maximum thickness of the plastic layer (Y value) and the caking index (G) is complex, requiring significant time and manpower, and demanding high standards for experimental equipment and operators. On the other hand, these indicators cannot fully and accurately reflect the caking properties of coal, especially for coal types with significant differences in quality, where the prediction results have large errors. For example, in actual production, although some coal types have a high caking index (G), their actual maximum fluidity is not ideal due to differences in their internal chemical structure and composition, leading to unstable coke quality when blending coal according to traditional indicators. Furthermore, with the increasing scarcity of coal resources and the growing diversity and complexity of coal types, traditional methods are insufficient to meet the demand for accurate prediction of the maximum fluidity of different coal types.

[0004] Therefore, it is urgent to develop a fast, accurate and widely applicable method for predicting the maximum flowability of coal fed into the furnace. Summary of the Invention

[0005] This invention overcomes the shortcomings of existing technologies and proposes a method for predicting the maximum fluidity of coal fed into the furnace using fatty hydrogen content. By measuring and analyzing the fatty hydrogen content of the coal fed into the furnace, this invention establishes a correlation model between the content and the maximum fluidity, thereby achieving accurate prediction of the maximum fluidity of the coal fed into the furnace and providing key technical support for coking coal blending processes. This invention also solves the problems of complex operation and large errors in existing methods for predicting the maximum fluidity of coal fed into the furnace.

[0006] This invention is achieved through the following technical solution: A method for predicting the maximum flowability of coal fed into the furnace using fatty hydrogen content is proposed, which calculates the maximum flowability of coal fed into the furnace based on the fatty hydrogen content.

[0007] Preferably, the fatty hydrogen content of the coal fed into the furnace is substituted into the formula MF=1405.8972-459.1697*Al H This yields the predicted value for maximum fluidity.

[0008] Preferably, the fatty hydrogen content of the coal fed into the furnace is calculated by measuring the volatile matter, carbon content, and hydrogen content of the coal.

[0009] Preferably, the volatile matter content of the coal fed into the furnace is determined according to the national standard GB / T 212-2008.

[0010] Preferably, the carbon and hydrogen content of the coal fed into the furnace is determined according to the national standard GB / T 31391-2015.

[0011] Preferably, the maximum fluidity of the coal fed into the furnace is determined according to the national standard GB / T 25213-2010, and the measured maximum fluidity of the coal fed into the furnace is compared with the predicted value to determine the error.

[0012] Preferably, the aroma content fa is first calculated based on the volatile matter and carbon content of the coal fed into the furnace using Formula 1; then, the aroma content H is calculated using Formula 2. daf and aroma f a Calculate the hydrogen content (Al) of fatty acids H ; Formula 1: ; Formula 2: .

[0013] The beneficial effects of this invention compared to the prior art are as follows: 1. Accuracy Comparison: Through testing and verification on a large number of actual coal samples, the root mean square error of the method of this invention in predicting the maximum flowability of coal entering the furnace is reduced by 3% compared with the traditional prediction method based on the maximum thickness Y of the plastic layer, and by 4% compared with the prediction method based on the caking index G. For a set of coal samples containing 500 different coal types, the average deviation between the maximum flowability predicted by the traditional method and the actual value is 3.5%, while the average deviation of the method of this invention is only 1.5%, which fully demonstrates the significant advantage of the method of this invention in prediction accuracy. 2. Comparison of Applicable Scope: Traditional methods are not effective for predicting the maximum mobility of certain special coal types, such as high-volatile coal and low-rank coal. The model established by the method of this invention has good versatility and can accurately predict the maximum mobility of various coal types, including the aforementioned special coal types, thus having a wider range of applications.

[0014] 3. This invention uses aliphatic hydrogen content as a key indicator for predicting maximum fluidity, overcoming the limitations of traditional methods that rely on indicators such as the maximum thickness of the plastic layer (Y value) and the bonding index (G). Aliphatic hydrogen content more directly reflects the status of active groups in the coal molecular structure and is closely related to the coal's bonding properties, thus making the prediction results more accurate and reliable. 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 maximum fluidity of coal fed into the furnace using the content of fatty hydrogen, specifically the following steps: S1. The volatile matter content of the coal fed into the furnace was determined according to the national standard GB / T 212-2008. In this embodiment, the coal fed into the furnace refers to the blended coal suitable for top-charged coke ovens. The volatile matter content was determined according to the national standard GB / T 212-2008, which is a uniformly stipulated national standard and will not change. According to the national standard GB / T 212-2008, the volatile matter content of coal A fed into the furnace is Vdaf = 22.3%.

[0017] S2. The carbon and hydrogen content of the coal fed into the furnace is determined according to the national standard GB / T 31391-2015. The carbon and hydrogen content of the coal is determined according to the national standard GB / T 31391-2015, which is a uniformly stipulated national standard and will not be changed. The carbon content of the coal fed into the furnace is determined according to the national standard GB / T 31391-2015. daf =84.5%, hydrogen content H daf =4.2%.

[0018] S3. Calculate the fatty hydrogen content of the coal fed into the furnace using the volatile matter, carbon content, and hydrogen content of the coal. This formula is reported in the literature and is widely accepted in the industry.

[0019] ; First, based on the volatile matter and carbon content of the coal fed into the furnace, the aromaticity fa = 0.8899 is obtained using the following formula; ;

[0020] Then based on the hydrogen content H daf and aroma f a Calculate the hydrogen content (Al) of fatty acids H =0.46242; S4. Substitute the fatty hydrogen content of the coal entering the furnace into the formula MF = 1405.8972 - 459.1697 * Al H This yields the predicted maximum fluidity; MF refers to the predicted maximum fluidity of the coal fed into the furnace, and * indicates the product. HThis represents the fatty hydrogen content. The formula is a curve fitted using multiple linear regression analysis based on 2000 sets of fatty hydrogen content and measured maximum fluidity data of coal fed into the furnace, with a correlation coefficient above 0.99. MF prediction = 1193.57 dd / min.

[0021] S5. The maximum fluidity of the coal fed into the furnace was determined according to the national standard GB / T 25213-2010. The measured maximum fluidity of the coal fed into the furnace was compared with the predicted value. The error was 1203.5dd / min, and the absolute error was 9.93dd / min. The prediction accuracy is high and does not deviate significantly with changes in the coal fed into the furnace and the thermal regime.

[0022] Example 2 This embodiment proposes a method for predicting the maximum fluidity of coal fed into the furnace using the content of fatty hydrogen, specifically the following steps: S1. The volatile matter content of the coal fed into the furnace was determined according to the national standard GB / T 212-2008. In this embodiment, the coal fed into the furnace refers to the blended coal suitable for tamping coke ovens. The volatile matter content was determined according to the national standard GB / T 212-2008, which is a uniformly stipulated national standard and will not change. According to the national standard GB / T 212-2008, the volatile matter content of coal A fed into the furnace is Vdaf = 33.8%.

[0023] S2. The carbon and hydrogen content of the coal fed into the furnace is determined according to the national standard GB / T 31391-2015. The carbon and hydrogen content of the coal is determined according to the national standard GB / T 31391-2015, which is a uniformly stipulated national standard and will not be changed. The carbon content of the coal fed into the furnace is determined according to the national standard GB / T 31391-2015. daf =76.6%, hydrogen content H daf =6.4%.

[0024] S3. Calculate the fatty hydrogen content of the coal fed into the furnace using the volatile matter, carbon content, and hydrogen content of the coal. This formula is reported in the literature and is widely accepted in the industry.

[0025] ;

[0026] First, based on the volatile matter and carbon content of the coal fed into the furnace, the aromaticity fa = 0.8364 is obtained using the following formula; ;

[0027] Then based on the hydrogen content H daf and aroma fa Calculate the hydrogen content (Al) of fatty acids H =1.047; S4. Substitute the fatty hydrogen content of the coal entering the furnace into the formula MF = 1405.8972 - 459.1697 * Al H This yields the predicted maximum fluidity; MF refers to the predicted maximum fluidity of the coal fed into the furnace, and * indicates the product. H This represents the fatty hydrogen content. The formula is a curve fitted using multiple linear regression analysis based on 2000 sets of fatty hydrogen content and measured maximum fluidity data of coal fed into the furnace, with a correlation coefficient above 0.99. MF prediction = 925.14 dd / min.

[0028] S5. The maximum fluidity of the coal fed into the furnace was determined according to the national standard GB / T 25213-2010. The measured maximum fluidity of the coal fed into the furnace was compared with the predicted value. The error was 908.5dd / min, and the absolute error was 16.64dd / min.

[0029] Example 3 S1. The volatile matter content of the coal fed into the furnace was determined according to the national standard GB / T 212-2008. In this embodiment, the coal fed into the furnace refers to the blended coal suitable for heat recovery coke ovens. The volatile matter content was determined according to the national standard GB / T 212-2008, which is a uniformly stipulated national standard and will not change. According to the national standard GB / T 212-2008, the volatile matter content of coal A fed into the furnace is Vdaf = 26.5%.

[0030] S2. The carbon and hydrogen content of the coal fed into the furnace is determined according to the national standard GB / T 31391-2015. The carbon and hydrogen content of the coal is determined according to the national standard GB / T 31391-2015, which is a uniformly stipulated national standard and will not be changed. The carbon content of the coal fed into the furnace is determined according to the national standard GB / T 31391-2015. daf =82.1%, hydrogen content H daf =4.9%.

[0031] S3. Calculate the fatty hydrogen content of the coal fed into the furnace using the volatile matter, carbon content, and hydrogen content of the coal. This formula is reported in the literature and is widely accepted in the industry.

[0032] ;

[0033] First, based on the volatile matter and carbon content of the coal fed into the furnace, the aromaticity fa = 0.8664 is obtained using the following formula; ;

[0034] Then based on the hydrogen content H daf and aroma f a Calculate the hydrogen content (Al) of fatty acids H =0.5566; S4. Substitute the fatty hydrogen content of the coal entering the furnace into the formula MF = 1405.8972 - 459.1697 * Al H This yields the predicted maximum fluidity; MF refers to the predicted maximum fluidity of the coal fed into the furnace, and * indicates the product. H This represents the fatty hydrogen content. The formula is a curve fitted using multiple linear regression analysis based on 2000 sets of fatty hydrogen content and measured maximum fluidity data of coal fed into the furnace, with a correlation coefficient above 0.99. MF prediction = 1150.32dd / min.

[0035] S5. The maximum fluidity of the coal fed into the furnace was determined according to the national standard GB / T 25213-2010. The measured maximum fluidity of the coal fed into the furnace was compared with the predicted value. The error was 1173.5dd / min, and the absolute error was 23.18dd / min.

[0036] 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.

[0037] 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 maximum fluidity of coal fed into a furnace using fatty hydrogen content, characterized in that, The maximum fluidity of the coal fed into the furnace is calculated by measuring its fatty hydrogen content; the fatty hydrogen content is then substituted into the formula MF = 1405.8972 - 459.1697 * Al. H This yields the predicted value for maximum fluidity.

2. The method for predicting the maximum fluidity of coal fed into the furnace using the fatty hydrogen content according to claim 1, characterized in that, The fatty hydrogen content of the coal fed into the furnace is calculated by analyzing its volatile matter, carbon content, and hydrogen content.

3. The method for predicting the maximum fluidity of coal fed into the furnace using the fatty hydrogen content according to claim 2, characterized in that, The volatile matter content of coal fed into the furnace was determined according to the national standard GB / T 212-2008.

4. The method for predicting the maximum fluidity of coal fed into the furnace using the fatty hydrogen content according to claim 2, characterized in that, The carbon and hydrogen content of the coal fed into the furnace shall be determined in accordance with the national standard GB / T 31391-2015.

5. The method for predicting the maximum fluidity of coal fed into the furnace using the fatty hydrogen content according to claim 1, characterized in that, The maximum fluidity of coal fed into the furnace was determined according to the national standard GB / T 25213-2010. The measured maximum fluidity of coal fed into the furnace was compared with the predicted value to determine the error.

6. The method for predicting the maximum fluidity of coal fed into the furnace using the fatty hydrogen content according to claim 2, characterized in that, First, calculate the aroma content (fa) based on the volatile matter and carbon content of the coal fed into the furnace using Formula 1; then, calculate the aroma content (H) using Formula 2. daf and aroma f a Calculate the hydrogen content (Al) of fatty acids H ; Formula 1: ; Formula 2: .