阅读说明：本技术 一种单煤和配煤煤气产率的预测方法 (Method for predicting yield of single coal and coal blending gas ) 是由 代鑫 李东涛 赵鹏 刘洋 郭德英 马超 徐荣广 何亚斌 于 2020-12-08 设计创作，主要内容包括：本发明特别涉及一种单煤和配煤煤气产率的预测方法,属于煤化工技术领域,方法包括：获取待测单煤；将待测单煤进行工业分析和元素分析,获得待测单煤的挥发分、灰分和氧氢比；根据待测单煤的挥发分、灰分和氧氢比,获得待测单煤的煤气产率；较之前的经验公式,本方法考量的因素更多,预测的准确度更高,可以适用于焦煤、肥煤、1/3焦煤、气煤和瘦煤等常用炼焦煤种。基于本方法,焦化厂可以对单种煤及配合煤的煤气产率进行预测,优化配煤结构,具有较好的应用价值。(The invention particularly relates to a method for predicting the yield of single coal and coal blending gas, which belongs to the technical field of coal chemical industry and comprises the following steps: acquiring single coal to be detected; carrying out industrial analysis and element analysis on the single coal to be detected to obtain the volatile component, ash content and oxygen-hydrogen ratio of the single coal to be detected; obtaining the coal gas yield of the single coal to be detected according to the volatile component, ash content and oxygen-hydrogen ratio of the single coal to be detected; compared with the prior empirical formula, the method has more factors to be considered, has higher prediction accuracy, and can be suitable for common coking coal types such as coking coal, fat coal, 1/3 coking coal, gas coal, lean coal and the like. Based on the method, the coking plant can predict the coal gas yield of single coal and blended coal, optimize the coal blending structure and have better application value.)

1. A method for predicting the yield of a coal gas, the method comprising:

acquiring single coal to be detected;

carrying out industrial analysis and element analysis on the single coal to be detected to obtain the volatile component, ash content and oxygen-hydrogen ratio of the single coal to be detected;

and obtaining the coal gas yield of the single coal to be detected according to the volatile component, ash content and oxygen-hydrogen ratio of the single coal to be detected.

2. The method for predicting the yield of the single coal gas according to claim 1, wherein in the step of obtaining the yield of the single coal gas to be tested according to the volatile component, the ash content and the oxygen-hydrogen ratio of the single coal to be tested, the calculation formula of the yield of the single coal gas is as follows:

Y＝a+bV_d-cA_d-eR

wherein Y is the gas yield of the single coal;

V_dis the dry base volatile of the single coal;

A_dis the dryer ash of the single coal;

r is the mass percentage ratio of oxygen element and hydrogen element of the single coal;

a, b, c, e are all constants.

3. The method for predicting the yield of mono-coal gas according to claim 2, wherein when the coal to be tested is coking coal, fat coal, 1/3 coking coal, gas coal or lean coal, a is 11.27, b is 0.74, c is 0.77, and e is 2.28.

4. The method for predicting the yield of the coal gas as claimed in claim 2, wherein the fitting method of the calculation formula of the coal gas yield comprises the following steps:

obtaining a plurality of single coals;

carrying out a pyrolysis test on a plurality of single coals to obtain the coal gas yield of the plurality of single coals;

carrying out industrial analysis and element analysis on a plurality of single coals to obtain volatile components, ash content and oxygen-hydrogen ratio of the single coals;

fitting the coal gas yield of a plurality of single coals and the volatile matter, ash content and oxygen-hydrogen ratio of the single coals; and obtaining a calculation formula of the coal gas yield.

5. The method for predicting the yield of the single coal gas according to claim 4, wherein in the step of subjecting the single coals to the pyrolysis test to obtain the gas yield of the single coals, the test temperature of the pyrolysis test is controlled to be in a range from room temperature to 900 ℃.

6. The method for predicting the yield of the single-coal gas according to claim 5, wherein the test temperature of the pyrolysis test is controlled to be in a range from room temperature to 900 ℃, and the method specifically comprises the following steps:

heating to 110 deg.C from room temperature, holding the temperature for 20min, heating to 900 deg.C, and holding the temperature for 30 min.

7. The method of predicting the yield of single-coal gas according to claim 6, wherein the heating rate of the pyrolysis test is 5 ℃/min.

8. A method for predicting coal blending gas yield, which is characterized by comprising the following steps:

obtaining coal blending to be tested;

classifying the coal blending to be detected to obtain a plurality of single coals to be detected and the mass fraction of each single coal;

respectively predicting the gas yield of a plurality of single coals to be tested to obtain the gas yield of the plurality of single coals to be tested, wherein the gas yield prediction adopts the prediction method of the single coal gas yield according to any one of claims 1 to 7;

and carrying out weighted summation on the gas yield of the plurality of single coals to be detected to obtain the gas yield of the coal blending to be detected.

9. The method for predicting coal gas yield of coal blending according to claim 8, wherein in the step of performing weighted summation on the coal gas yields of the plurality of single coals to be tested to obtain the coal gas yield of the coal blending to be tested, the calculation formula of the weighted summation is as follows:

Y_blend＝∑X_i Y_i

wherein the content of the first and second substances,

Y_blendthe coal gas yield of the blended coal is obtained;

X_iis the mass fraction of single coal;

Y_ithe coal gas yield of single coal.

Technical Field

The invention belongs to the technical field of coal chemical industry, and particularly relates to a method for predicting the yield of single coal and coal blending gas.

Background

The coke oven gas is a byproduct of the coking industry, is a combustible gas generated when coke and tar products are produced after the coking coal is subjected to high-temperature dry distillation in a coking furnace, contains combustible components such as hydrogen, methane, carbon monoxide, unsaturated hydrocarbon and the like, has a high calorific value, and is an important raw material in the chemical industry. With the development of the coal gas purification technology and the development of the coke oven gas utilization technology, the resource utilization of the coke oven gas has wide development prospect.

At present, high-quality coking coal at home and abroad is less and less, the coal blending structure is optimized, and the ratio of gas coal to 1/3 coking coal is improved, so that the method is an effective means for reducing the cost of metallurgical coke blending and expanding available resources of the blending coal. Therefore, the advantages and the disadvantages of various coal resources are required to be determined, matched accurately and used reasonably, so that the detailed research on various coal resources is required to find out the existing rules and better guide the industrial production.

Early studies formed an empirical formula by analyzing the relationship between the volatile content of coal and the gas yield:

Y＝a√(V_daf)

wherein the content of the first and second substances,

y is the coal gas yield of a single coal;

V_dafis the dry ash-free base volatile component of single coal;

a is constant (3.3 for coking coal, 3 for gas coal);

the estimation accuracy of the formula is poor in practical application effect.

Disclosure of Invention

In view of the above problems, the present invention has been developed to provide a method for predicting the yield of single and blended coal gases that overcomes or at least partially solves the above problems.

The embodiment of the invention provides a method for predicting yield of single coal gas, which comprises the following steps:

acquiring single coal to be detected;

carrying out industrial analysis and element analysis on the single coal to be detected to obtain the volatile component, ash content and oxygen-hydrogen ratio of the single coal to be detected;

and obtaining the coal gas yield of the single coal to be detected according to the volatile component, ash content and oxygen-hydrogen ratio of the single coal to be detected.

Optionally, in the obtaining of the coal gas yield of the single coal to be detected according to the volatile component, the ash content and the oxygen-hydrogen ratio of the single coal to be detected, the calculation formula of the coal gas yield is as follows:

Y＝a+bV_d-cA_d-eR

wherein Y is the gas yield of the single coal;

V_dis the dry base volatile of the single coal;

A_dis the dryer ash of the single coal;

r is the mass percentage ratio of oxygen element and hydrogen element of the single coal;

a, b, c, e are all constants.

Optionally, when the coal to be detected is coking coal, fat coal, 1/3 coking coal, gas coal or lean coal, a is 11.27, b is 0.74, c is 0.77, and e is 2.28.

Optionally, the fitting method of the calculation formula of the gas yield includes:

obtaining a plurality of single coals;

carrying out a pyrolysis test on a plurality of single coals to obtain the coal gas yield of the plurality of single coals;

carrying out industrial analysis and element analysis on a plurality of single coals to obtain volatile components, ash content and oxygen-hydrogen ratio of the single coals;

fitting the coal gas yield of a plurality of single coals and the volatile matter, ash content and oxygen-hydrogen ratio of the single coals; and obtaining a calculation formula of the coal gas yield.

Optionally, in the step of performing a pyrolysis test on a plurality of single coals to obtain the coal gas yield of the plurality of single coals, the test temperature of the pyrolysis test is controlled between room temperature and 900 ℃.

Optionally, the test temperature of the pyrolysis test is controlled between room temperature and 900 ℃, and specifically includes:

heating to 110 deg.C from room temperature, holding the temperature for 20min, heating to 900 deg.C, and holding the temperature for 30 min.

Optionally, the heating rate of the pyrolysis test is 5 ℃/min.

Based on the same inventive concept, the embodiment of the invention also provides a method for predicting the coal blending gas yield, which comprises the following steps:

obtaining coal blending to be tested;

classifying the coal blending to be detected to obtain a plurality of single coals to be detected and the mass fraction of each single coal;

respectively predicting the gas yield of a plurality of single coals to be detected to obtain the gas yield of the plurality of single coals to be detected, wherein the gas yield prediction adopts the prediction method of the single coal gas yield;

and carrying out weighted summation on the gas yield of the plurality of single coals to be detected to obtain the gas yield of the coal blending to be detected.

Optionally, in the step of performing weighted summation on the gas yields of the plurality of single coals to be measured to obtain the gas yield of the coal blending to be measured, a calculation formula of the weighted summation is as follows:

Y_blend＝∑X_i Y_i

wherein the content of the first and second substances,

Y_blendthe coal gas yield of the blended coal is obtained;

X_iis the mass fraction of single coal;

Y_ithe coal gas yield of single coal.

One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:

the method for predicting the yield of the single coal gas provided by the embodiment of the invention comprises the following steps: acquiring single coal to be detected; carrying out industrial analysis and element analysis on the single coal to be detected to obtain the volatile component, ash content and oxygen-hydrogen ratio of the single coal to be detected; and obtaining the coal gas yield of the single coal to be detected according to the volatile component, ash content and oxygen-hydrogen ratio of the single coal to be detected. Compared with the prior empirical formula, the method has more factors to be considered, has higher prediction accuracy, and can be suitable for common coking coal types such as coking coal, fat coal, 1/3 coking coal, gas coal, lean coal and the like. Based on the method, the coking plant can predict the coal gas yield of single coal and blended coal, optimize the coal blending structure and have better application value.

The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

Fig. 1 is a schematic flow chart of a method provided by an embodiment of the present invention.

Detailed Description

The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.

Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.

Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.

The current way of calculating the gas yield is by empirical formula developed by early analytical studies:

Y＝a√(V_daf)

wherein the content of the first and second substances,

y is the coal gas yield of a single coal;

V_dafis the dry ash-free base volatile component of single coal;

a is constant (3.3 for coking coal, 3 for gas coal);

the applicant finds in the course of the invention that: the empirical formula is estimated from a parameter of the volatile component, and the accuracy is poor, so based on the previous research results, the applicant finds that the higher the ash content in the coal, the more developed the pore size distribution formed by pyrolysis, and the generated coal gas can escape more easily. In addition, the hydrogen-oxygen ratio in coal also has a greater influence on the products produced by the coal during pyrolysis; the applicant carries out a great deal of research and provides a prediction method considering multiple influence factors, and particularly predicts the coal gas yield of single coal through multi-parameter fitting of ash content, volatile matter, oxygen-hydrogen ratio and the like.

According to an exemplary embodiment of the present invention, there is provided a method for predicting a yield of a coal gas, the method including:

s1, acquiring single coal to be detected;

s2, carrying out industrial analysis and element analysis on the single coal to be detected to obtain the volatile component, ash content and oxygen-hydrogen ratio of the single coal to be detected;

and S3, obtaining the coal gas yield of the single coal to be detected according to the volatile component, ash content and oxygen-hydrogen ratio of the single coal to be detected.

The gas yield is calculated as follows:

Y＝a+bV_d-cA_d-eR

wherein Y is the gas yield of the single coal;

V_dis the dry base volatile of the single coal;

A_dis the dryer ash of the single coal;

r is the mass percentage ratio of oxygen element and hydrogen element of the single coal;

a, b, c, e are all constants.

As an alternative embodiment, when the coal to be measured is coking coal, fat coal, 1/3 coking coal, gas coal or lean coal, a is 11.27, b is 0.74, c is 0.77, and e is 2.28, that is, the calculation formula is: y is 11.27+0.74V_d-0.77A_d-2.28R。

As an alternative embodiment, the fitting method of the calculation formula of the gas yield comprises:

obtaining a plurality of single coals;

carrying out a pyrolysis test on a plurality of single coals to obtain the coal gas yield of the plurality of single coals;

carrying out industrial analysis and element analysis on a plurality of single coals to obtain volatile components, ash content and oxygen-hydrogen ratio of the single coals;

fitting the coal gas yield of a plurality of single coals and the volatile matter, ash content and oxygen-hydrogen ratio of the single coals; and obtaining a calculation formula of the coal gas yield.

As an optional implementation manner, in the step of performing a pyrolysis test on a plurality of single coals to obtain the coal gas yield of the plurality of single coals, the test temperature of the pyrolysis test is controlled to be in the range from room temperature to 900 ℃; the specific operation is as follows: the temperature is kept for 20min after the temperature is increased from the room temperature to 110 ℃, then the temperature is kept for 30min after the temperature is increased to 900 ℃, and the heating rate of the whole pyrolysis test is 5 ℃/min.

According to another exemplary embodiment of the present invention, there is provided a method for predicting coal gas yield, including:

obtaining coal blending to be tested;

classifying the coal blending to be detected to obtain a plurality of single coals to be detected and the mass fraction of each single coal;

respectively predicting the gas yield of a plurality of single coals to be tested to obtain the gas yield of the plurality of single coals to be tested, wherein the gas yield prediction adopts the prediction method of the single coal gas yield according to any one of claims 1 to 7;

weighting and summing the gas yield of the plurality of single coals to be detected to obtain the gas yield of the coal blending to be detected; specifically, the method comprises the following steps: the weighted sum is calculated as follows:

Y_blend＝∑X_i Y_i

wherein the content of the first and second substances,

Y_blendthe coal gas yield of the blended coal is obtained;

X_iis the mass fraction of single coal;

Y_ithe coal gas yield of single coal.

The method for predicting the coal gas yield of the single coal and the coal blending gas will be described in detail below by combining examples, comparative examples and experimental data.

Example 1

A method of predicting a yield of a coal gas, the method comprising:

s1, acquiring single coal to be detected; the single coals to be tested are coking coal, 1/3 coking coal, fat coal, gas coal and lean coal, and the tests are respectively carried out.

S2, carrying out industrial analysis and element analysis on the single coal to be detected to obtain the volatile component, ash content and oxygen-hydrogen ratio of the single coal to be detected;

s3, obtaining the coal gas yield of the single coal to be detected according to the volatile component, ash content and oxygen-hydrogen ratio of the single coal to be detected, wherein the specific calculation formula is as follows:

Y＝11.27+0.74V_d-0.77A_d-2.28R

wherein the content of the first and second substances,

y is the coal gas yield of a single coal;

V_dis the drying base volatile component of single coal;

A_dis the dryer ash of a single coal;

r is the mass percentage content ratio of oxygen element and hydrogen element of single coal.

Comparative example 1

A method of predicting a yield of a coal gas, the method comprising:

s1, acquiring single coal to be detected; the single coals to be tested are coking coal, 1/3 coking coal, fat coal, gas coal and lean coal, and the tests are respectively carried out.

S2, carrying out industrial analysis on the single coal to be detected to obtain volatile components of the single coal to be detected;

s3, obtaining the coal gas yield of the single coal to be detected according to the volatile component of the single coal to be detected, wherein the specific calculation formula is as follows:

Y＝a√(V_daf)

wherein the content of the first and second substances,

y is the coal gas yield of a single coal;

V_dafis the dry ash-free base volatile component of single coal;

a is constant (3.3 for coking coal, 3 for gas coal);

experimental example:

selecting common coking coal types of a coking plant, including coking coal, 1/3 coking coal, fat coal, gas coal, lean coal and other coal types, carrying out pyrolysis tests on 7 coal samples, introducing nitrogen with the concentration of 99.9% into a fixed bed reactor before the test starts, removing air in the fixed bed reactor, heating to 110 ℃ from room temperature, keeping the temperature for 20min to remove moisture in a pulverized coal sample, heating to 900 ℃ and keeping the temperature for 30min, wherein the heating rate in the whole test process is 5 ℃/min, and introducing nitrogen for atmosphere protection after the reaction is finished until the temperature is cooled to the room temperature. And (3) putting tar and water generated in the test process into a cold trap for cooling, weighing the quality of the coal tar sample and the tar, and sealing and storing the residual coal tar sample. The test is repeated for 3 times, the test result has good repeatability, and the average value of the 3 parallel tests is taken as the final test result.

The results of the examples, comparative examples and experimental examples are shown in the following table:

from the data in the table, one can see: the error of the predicted value and the measured value of the yield of the single coal gas is within 2% by adopting the prediction method provided by the embodiment, the deviation of the predicted value of the yield of the single coal gas adopting the comparative example is more than 30% at most, and the prediction method of the comparative example can predict only three coal types.

One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:

(1) compared with the prior empirical formula, the prediction method provided by the embodiment of the invention has more considered factors and higher prediction accuracy;

(2) the prediction method provided by the embodiment of the invention can be suitable for common coking coal types such as coking coal, fat coal, 1/3 coking coal, gas coal, lean coal and the like;

(3) based on the method provided by the embodiment of the invention, the coking plant can predict the coal gas yield of single coal and blended coal, optimize the coal blending structure and have better application value.

Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.