Method for evaluating volume change rate of foundry coke

Abstract

The invention discloses a method for evaluating the volume change rate of foundry coke, and belongs to the technical field of foundry coke production. The method comprises the following steps: substituting volatile components and caking indexes of coal as fired into a formula Vc = 0.4435 * Vdaf + 0.1995 * G-20.1214 to obtain a predicted value of the volume change rate of foundry coke; according to the method, the complex relation between the as-fired coal index and the foundry coke volume change rate can be accurately captured, the average absolute error can be controlled within 3% through actual verification, and compared with the prior art, the accuracy is improved by 40%-60%; the problem that the volume change rate of foundry coke cannot be accurately predicted is solved.

Description

Technical Field

[0001] This invention belongs to the field of foundry coke production technology, specifically a method for evaluating the volume change rate of foundry coke. Background Technology

[0002] In the modern foundry industry, foundry coke is an indispensable basic material, and its performance directly affects the stability of the casting process and the final quality of the castings. The volume change rate of foundry coke during the production process is one of the key indicators for measuring its quality, and it is closely related to the coke oven charging efficiency, coke output, and the performance of coke in the casting process. Currently, the industry has limited methods for evaluating the volume change rate of foundry coke. Traditional methods mostly rely on the experience and judgment of operators or use simple evaluation methods based on single indicators, lacking systematicity and accuracy. Although it is known that the volatile matter and caking index of the coal fed into the furnace are related to the volume change of foundry coke, existing technologies have failed to effectively integrate these two indicators to form a complete and reliable evaluation system. This makes it difficult for enterprises to accurately predict the volume change of foundry coke during the production process, making it impossible to adjust production parameters in a timely manner. Consequently, this leads to low production efficiency, resource waste, and may also affect the quality of castings due to substandard foundry coke quality, increasing production costs and scrap rates. Summary of the Invention

[0003] This invention overcomes the shortcomings of existing technologies and proposes a method for evaluating the volume change rate of foundry coke. By deeply studying the intrinsic relationship between the volatile matter and caking index of coal fed into the furnace and the volume change rate of foundry coke, this invention constructs a completely new evaluation method and solves the problem of the inability to accurately predict the volume change rate of foundry coke.

[0004] This invention is achieved through the following technical solution: A method for evaluating the volume change rate of foundry coke involves substituting the volatile matter and caking index of the coal fed into the formula Vc=0.4435*Vdaf+0.1995*G-20.1214 to obtain a predicted value for the volume change rate of foundry coke.

[0005] Vc refers to the predicted volume change rate of foundry coke, Vdaf refers to the volatile matter content, and G refers to the bonding index.

[0006] Preferably, the volatile matter content of the coal fed into the furnace is determined according to the national standard GB / T 212-2008.

[0007] Preferably, the caking index of the coal fed into the furnace is determined according to the national standard GB / T 5447-2014.

[0008] Preferably, a small coke oven test is conducted according to industry standard YB / T 4526-2016 to calculate the actual volume change rate; the predicted value is compared with the actual volume change rate to verify the accuracy.

[0009] Preferably, the volume change of the coal cake entering the furnace and the coke cake exiting the furnace is measured, and the actual volume change rate is calculated.

[0010] Preferably, an infrared laser displacement sensor is used to measure the volume Vcoal of the coal cake entering the furnace, and the volume Vcoke of the coke cake is determined by the water displacement method. The actual volume change rate is calculated as |(Vcoal-Vcoke) / Vcoal×100%|.

[0011] The beneficial effects of this invention compared to the prior art are as follows: 1. Significantly Improved Accuracy: Existing evaluation methods are mostly based on experience or a single indicator, resulting in significant errors. This invention trains a support vector regression model using multiple sets of data, which can accurately capture the complex relationship between the coal input index and the change rate of foundry coke volume. Practical verification shows that the average absolute error can be controlled within 3%, improving accuracy by 40%-60% compared to existing technologies. 2. Significantly Improved Evaluation Efficiency: Traditional evaluation methods are cumbersome, rely on manual experience, and are time-consuming. The model formula established in this invention enables automated and rapid evaluation, providing results instantly after data input, greatly shortening evaluation time and improving production decision-making efficiency. 3. Wider Applicability: Existing technologies have limited applicability, and the reliability of evaluation results decreases when coal quality changes or production conditions change. This invention trains the model formula with a large amount of data from different operating conditions, enabling it to adapt to various coal types and production conditions, and exhibiting stronger versatility and stability. Detailed Implementation

[0012] 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

[0013] This embodiment proposes a method for evaluating the volume change rate of foundry coke, specifically comprising 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 is an industrial production blend coal suitable for top-charged coke ovens. The volatile matter content was determined according to the national standard GB / T 212-2008. The national standard is a guideline for regulating the industry. The operating procedures and calculation methods are strictly prescribed and will not change. The determined volatile matter content Vdaf=33.7%.

[0014] S2. The caking index of the coal fed into the furnace was determined according to the national standard GB / T 5447-2014. The caking index was determined according to the national standard GB / T 5447-2014. The national standard is the standard for regulating the industry. The operating procedures and calculation methods are strictly prescribed and will not change. The measured caking index is G=101.

[0015] S3. Substituting the volatile matter and caking index of the coal fed into the formula Vc = 0.4435 * Vdaf + 0.1995 * G - 20.1214, we obtain the predicted result of the foundry coke volume change rate. Vc refers to the predicted foundry coke volume change rate, Vdaf refers to the volatile matter content, and G refers to the caking index. This formula is obtained through multiple linear regression based on 2000 sets of volatile matter content, caking index, and measured coke cake volume change rates. * indicates multiplication. Substituting the measured volatile matter and caking index into this formula yields the predicted foundry coke volume change rate Vc. =14.974%; S4. A 40 kg small coke oven test was conducted according to industry standard YB / T 4526-2016. The volume of the coal cake (Vcoal) fed into the oven was measured using an infrared laser displacement sensor, and the volume of the coke cake (Vcoke) was measured using the water displacement method. The volume change rate was calculated. Actual Vc = |(Vcoal - Vcoke) / Vcoal × 100%| = 14.90%; S5. Comparing the predicted value of the foundry coke volume change rate with the experimental results of the 40 kg coke oven foundry coke volume change rate, the prediction accuracy is high and does not deviate significantly with changes in the coal fed into the furnace and the thermal regime. The predicted foundry coke volume change rate Vc 预测 =14.974%; Actual Vc =14.90%. The absolute error is 0.074%. Example 2

[0016] 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 is an industrial production blend coal suitable for tamping coke ovens. The volatile matter content was determined according to the national standard GB / T 212-2008. The national standard is the guideline for regulating the industry. The operating procedures and calculation methods are strictly prescribed and will not change. The determined volatile matter content Vdaf=29.8%.

[0017] S2. The caking index of the coal fed into the furnace was determined according to the national standard GB / T 5447-2014. The caking index was determined according to the national standard GB / T 5447-2014. The national standard is the standard for regulating the industry. The operating procedures and calculation methods are strictly prescribed and will not change. The measured caking index is G=85.

[0018] S3. Substituting the volatile matter and caking index of the coal fed into the formula Vc = 0.4435 * Vdaf + 0.1995 * G - 20.1214, we obtain the predicted result of the foundry coke volume change rate. Vc refers to the predicted foundry coke volume change rate, Vdaf refers to the volatile matter content, and G refers to the caking index. This formula is obtained through multiple linear regression based on 2000 sets of volatile matter content, caking index, and measured coke cake volume change rates. * indicates multiplication. Substituting the measured volatile matter and caking index into this formula yields the predicted foundry coke volume change rate Vc. =10.0524%; S4. A 40 kg small coke oven test was conducted according to industry standard YB / T 4526-2016. The volume of the coal cake (Vcoal) fed into the oven was measured using an infrared laser displacement sensor, and the volume of the coke cake (Vcoke) was measured using the water displacement method. The volume change rate was calculated. Actual Vc = |(Vcoal - Vcoke) / Vcoal × 100%| = 9.9%; S5. Comparing the predicted value of the foundry coke volume change rate with the experimental results of the 40 kg coke oven foundry coke volume change rate, the prediction accuracy is high and does not deviate significantly with changes in the coal fed into the furnace and the thermal regime. The predicted foundry coke volume change rate Vc 预测 =10.0524%; Actual Vc = 9.90%. The absolute error is 0.1524%. Example 3

[0019] 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 is an industrial production blend coal suitable for heat recovery coke ovens. The volatile matter content was determined according to the national standard GB / T 212-2008. The national standard is a guideline for regulating the industry, and the operating procedures and calculation methods are strictly prescribed and will not change. The determined volatile matter content Vdaf = 21.7%.

[0020] S2. The caking index of the coal fed into the furnace was determined according to the national standard GB / T 5447-2014. The caking index was determined according to the national standard GB / T 5447-2014. The national standard is the guideline for regulating the industry, and the operating procedures and calculation methods are strictly prescribed and will not change. The determined caking index is G=65.

[0021] S3. Substituting the volatile matter and caking index of the coal fed into the formula Vc = 0.4435 * Vdaf + 0.1995 * G - 20.1214, we obtain the predicted result of the foundry coke volume change rate. Vc refers to the predicted foundry coke volume change rate, Vdaf refers to the volatile matter content, and G refers to the caking index. This formula is obtained through multiple linear regression based on 2000 sets of volatile matter content, caking index, and measured coke cake volume change rates. * indicates multiplication. Substituting the measured volatile matter and caking index into this formula yields the predicted foundry coke volume change rate Vc. =2.47%; S4. A 40 kg small coke oven test was conducted according to industry standard YB / T 4526-2016. The volume of the coal cake (Vcoal) fed into the oven was measured using an infrared laser displacement sensor, and the volume of the coke cake (Vcoke) was determined using the water displacement method. The volume change rate was calculated. Actual Vc = |(Vcoal - Vcoke) / Vcoal × 100%| = 2.6%; S5. Comparing the predicted value of the foundry coke volume change rate with the experimental results of the 40 kg coke oven foundry coke volume change rate, the prediction accuracy is high and does not deviate significantly with changes in the coal fed into the furnace and the thermal regime. The predicted foundry coke volume change rate Vc 预测 =2.47%; Actual Vc = 2.6%. The absolute error is 0.13%.

[0022] 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.

[0023] 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 of evaluating the volume change rate of a cast coke characterized by, The volatile and caking index of the coal entering the furnace are brought into the formula Vc=0.4435*Vdaf+0.1995*G-20.1214 to obtain a predicted value of the volume change rate of the cast coke; Vc refers to the predicted volume change rate of the cast coke, Vdaf refers to the volatile content, and G refers to the caking index.

2. A method of evaluating the volume change rate of a cast coke body according to claim 1, characterized in that, The volatile of the coal entering the furnace is determined according to the national standard GB / T 212-2008.

3. A method of evaluating the volume change rate of a cast coke body according to claim 1, characterized in that, The caking index of the coal entering the furnace is determined according to the national standard GB / T 5447-2014.

4. A method of evaluating the volume change rate of a cast coke body according to claim 1, characterized in that, The actual volume change rate is calculated through a small coke oven test according to the industry standard YB / T 4526-2016; the predicted value is compared with the actual volume change rate to verify the accuracy.

5. A method of evaluating the volume change rate of a cast coke body according to claim 4, characterized in that, The volume change of the coal cake entering the furnace and the coke cake exiting the furnace is measured, and the actual volume change rate is calculated.

6. A method of evaluating the volume change rate of a cast coke body according to claim 5, characterized in that, The volume Vcoal of the coal cake entering the furnace is measured by using an infrared laser displacement sensor, the volume Vcoke of the coke cake is determined by using the drainage method, and the actual volume change rate is calculated as |(Vcoal-Vcoke) / Vcoal*100%|.