JP7103009B2 - Vitrinit reflectance Ro estimation method - Google Patents

Description

The present invention relates to a method for estimating the Vitrinit reflectance Ro of coal.

The vitrinit reflectance Ro of coal is used as an index showing the degree of coalification, and is widely used in operation management (coal compounding management) in coke production because it correlates with the coke characteristics of coal, especially the coke strength DI.

Vitrinite is one of three microstructure components (maceral groups) in which coal has similar microstructure components (macerals) and is grouped together. Vitrinit is mainly derived from the xylem of plants, is more homogeneous than other microstructure components [Inertinite, Exinite], and occupies a major part of the organic matter that makes up coal. Therefore, it is present in almost all coals, and the brightness of Vitrinit increases with the progress of coalification. Therefore, Vitrinit is evaluated in the basic properties and structural analysis of coal.

Vitrinit analysis is standardized by JIS M8816-1992. Here, a method for measuring the reflectance of the microstructure component of coal is defined. First, the sample (coal) is crushed so as not to generate fine powder as much as possible, and the sample (coal) is sufficiently dried. At this time, if a predetermined amount of fine powder of 75 μm or less is contained, the sample preparation must be performed again. The obtained coal particles are mixed with a binder (resin) to prepare a predetermined briquette, and then the briquette is polished to a flat and intact surface to form a microscopically observed surface. In measuring the reflectance, a device equipped with an epi-illumination device, an indicator with an amplifier, etc. in addition to the microscope is used to measure the maximum oil-immersion reflectance of the microstructure component in the polishing sample. When obtaining the maximum reflectance of Vitrinit, the maximum reflectance Ro (%) is obtained by setting the measurement points to 50 points or more for one polished sample. In calculating this maximum reflectance Ro, a predetermined formula using the reflectance (%) of the standard material and the reading of each indicator of the standard material and Vitrinit is used, and in principle, these are used for two polishing samples. Is carried out to calculate the average maximum reflectance Ro obtained by averaging.

Here, coal is composed of macerals, which are various constituents, and a large number of coal particles other than vitrinit are mixed in the above-mentioned coal particles. Therefore, in order to measure the reflectance of vitrinit, it is necessary to discriminate the vitrinit particles among the coal particles in advance. Since the middle part is Vitrinit, the Vitrinit particles can be discriminated by these differences. In Vitrinit, the source plant structure is lost and the state is homogeneous, whereas in other microstructure components, this source plant structure is present. Since the remaining particles, the vitrinit particles are discriminated based on these differences.

However, some of the methods for analyzing vitrinits specified in JIS, including such preliminary work, require skill, and the results may be affected by the measurer. Further, when the fine coal particles have a small particle size, it becomes more difficult to discriminate the vitrinit particles, and it takes more time and effort for the work.

Therefore, for example, Patent Document 1 proposes a method of measuring the reflectance of vitrinit by directly polishing coal without crushing it to form an observation surface with a microscope. In this method, since Vitrinit is a substance having high thermoplasticity, most of the Vitrinit particles have a special angular shape on the polished observation surface, and the maceral constituent particles other than Vitrinit have this shape. Focusing on the fact that it does not have such a shape, it is possible to reliably measure the reflectance of vitrinit even for fine coal particles.

JP-A-2007-132795

The Vitrinit reflectance Ro of coal is widely and generally used as an operation management index for coke production. On the other hand, since high-quality strong caking coal as a raw material for coke is depleted in terms of resources, a method of using low-grade inferior coal is being studied. Since such inferior coal has a large variation in grade, for example, it is necessary to manage each product unit (lot), and it is necessary to quickly collect data at the operation site.

However, as described above, the accuracy of the measurement of the Vitrinit reflectance Ro specified in JIS, including the case of high-quality coal, may change depending on individual differences depending on the skill level and skill of the measurer. .. In particular, in the case of inferior coal, the vitrinit tends to be present in a non-uniform manner as compared with good quality coal, so that the measurement result tends to include an error. Moreover, the measurement requires a dedicated measuring device, and the measurement itself is complicated, and usually takes several days to two weeks.

Therefore, as a result of diligent studies on a method capable of obtaining the Vitrinit reflectance Ro of coal more easily and quickly, for example, at the operation site, the present inventors have conducted intensive studies on the hydrogen gas generated when the coal is heated to the carbonization temperature. The amount of hydrogen gas generated per unit mass of coal was obtained from the total amount of coal, and it was found that this amount of hydrogen gas generated correlates with the Vitrinit reflectance Ro of the coal. Then, by utilizing this relationship, the vitrinit reflectance Ro of coal can be easily and quickly obtained, and a highly accurate estimated value can be obtained regardless of the grade of coal. Therefore, the present invention. Was completed.

Therefore, an object of the present invention is to provide a method capable of estimating the vitrinit reflectance Ro of coal more easily and quickly regardless of the grade of coal.

That is, the gist of the present invention is as follows.
(1) A method for estimating the vitrinit reflectance Ro of coal.
For a plurality of test coals having a known Vitrinit reflectance Ro, the total amount of hydrogen gas generated by heating to the dry distillation temperature T when coke is produced is measured in advance, and hydrogen per unit mass of the test coal is measured. The amount of gas generated (H ₂ ) is obtained, and the correlation equation between the hydrogen generation index based on this amount of hydrogen gas generated (H ₂ ) and the Vitrinit reflectance Ro is obtained.
For real coal whose Vitrinit reflectance Ro is unknown, the total amount of hydrogen gas generated by heating to the dry distillation temperature T is measured, and hydrogen generation based on the amount of hydrogen gas generated per unit mass of the real coal (H ₂ ) is generated. A method for estimating the Vitrinit reflectance Ro, which comprises obtaining an exponent and estimating the Vitrinit reflectance Ro from the correlation equation.
(2) The hydrogen generation index is the amount of hydrogen gas generated (H ₂ ) divided by the total amount of hydrogen in coal (Hdaf) on an anhydrous ashless basis. Estimating method.
(3) The Vitrinit reflectivity Ro according to (1), wherein the hydrogen generation index is obtained by dividing the amount of hydrogen gas generated (H ₂ ) by the atomic number ratio (H / C) of hydrogen and carbon in coal. Estimating method.

According to the present invention, the vitrinit reflectance Ro of coal can be easily and quickly obtained, and a highly accurate estimated value can be obtained regardless of the grade of coal. In particular, in the present invention, by using the correlation formula prepared in advance, the vitrinit reflectance Ro can be obtained without using a dedicated measuring device, and the vitrinit reflectance Ro can be obtained without being influenced by the skill level and skill of the measurer. You will be able to obtain an estimate of the objective result.

FIG. 1 is an overall schematic explanatory view of a gas monitoring device used for measuring hydrogen gas. FIG. 2 shows an example of a graph in which hydrogen gas generation behavior from coal when a gas monitoring device is used is continuously measured. FIG. 3 is a graph showing the relationship between the amount of hydrogen gas generated per unit mass (H ₂ ) and the vitrinit reflectance Ro for the test coal used in the examples. FIG. 4 shows the test coal used in the examples obtained by dividing the amount of hydrogen gas generated per unit mass (H ₂ ) by the total amount of hydrogen in the coal on an anhydrous ashless basis (Hdaf) and the Vitrinit reflection. It is a graph which shows the relationship with rate Ro. FIG. 5 shows the test coal used in the examples obtained by dividing the amount of hydrogen gas generated per unit mass (H ₂ ) by the atomic number ratio (H / C) of hydrogen and carbon in the coal and Vitrinit. It is a graph which shows the relationship with the reflectance Ro. FIG. 6 is a graph obtained in the same manner as in FIG. 3 by selecting a test coal having a Vitrinit reflectance Ro of 0.85 or less from the test coals used in the examples. FIG. 7 is a graph obtained in the same manner as in FIG. 4 by selecting a test coal having a Vitrinit reflectance Ro of 0.85 or less from the test coals used in the examples. FIG. 8 is a graph obtained in the same manner as in FIG. 5 by selecting a test coal having a Vitrinit reflectance Ro of 0.85 or less from the test coals used in the examples. FIG. 9 is a graph showing the relationship between the volatile matter (VM) and the vitrinit reflectance Ro of the test coal used in the examples. FIG. 10 is a graph obtained in the same manner as in FIG. 9 by selecting a test coal having a Vitrinit reflectance Ro of 0.85 or less from the test coals used in the examples.

Hereinafter, the present invention will be described in detail.
In the present invention, first, for a plurality of test coals having a known Vitrinit reflectance Ro, the total amount of hydrogen gas generated by heating to the dry distillation temperature T when coke is produced is measured. Generally, the vitrinit reflectance Ro (%) of coal is about 0.5 to 2 (%), and among them, the one used for coke production has a maximum vitrinit reflectance Ro of about 1.8 (%). Therefore, preferably, a plurality of test coals including those on the upper limit side and the lower limit side of this numerical range are prepared. Specifically, it is preferable to prepare a test coal having a Vitrinit reflectance Ro covering at least a range of 0.7 to 1.5 (%), and preferably a Vitrinit reflectance Ro of 0.5 to 2 (preferably). It is advisable to prepare test coal that covers the range of%). Further, for these test coals, the average maximum reflectance Ro (%) of Vitrinit is obtained in advance by the method specified in JIS M8816-1992 described above. In this specification, the average maximum reflectance Ro of Vitrinit is simply expressed as Vitrinit reflectance Ro.

The method for measuring the total amount of hydrogen gas generated when coal (test coal, real coal) is heated to the dry distillation temperature T is not particularly limited, and for example, gas chroma, which is the most common hydrogen gas measuring method. A tograph-thermal conductivity detector (GC-TCD) or the like may be used. In this case, the gas generated from the heating start temperature to the dry distillation temperature T is stored in a gas sampling bag or the like, and the total amount of generated hydrogen is measured.

On the other hand, it is used to easily predict the amount of coke oven gas (COG) generated and the amount of heat generated in the coke oven with an experimental device (Reference 1: Patent No. 4050989), and to analyze the carbonization reaction of coal (Reference). Reference 2: Nishito et al. (2010). Analysis of coal carbonization reaction by gas monitoring and continuous measurement of coke oven generated gas Nippon Steel Technical Report No. 390, 101-111.) Hydrogen generated by carbonization using a gas monitoring device The amount of the gas may be continuously measured.

FIG. 1 shows an overall schematic view of this gas monitoring device. In this device, while flowing a carrier gas 1 such as nitrogen, He, and Ar which is an inert gas through a gas purifier 2 and a flow meter 3, a quartz core tube 4 containing a certain amount of coal 5 is tubularly electrified. It is heated in the furnace 6 and the generated gas is introduced into a semiconductor hydrogen gas sensor 8 such as SnO ₂ having sensitivity to H ₂ through a tar trap 7. A recorder 9 is attached to the hydrogen gas sensor 8, and if it is such a gas monitoring device, it is not necessary to use a gas sampling bag or the like, and the amount of hydrogen generated by carbonization can be continuously measured. , The total amount of hydrogen gas generated by time integration can be obtained. Here, instead of the hydrogen gas sensor 8, a gas chromatograph device equipped with a TCD detector (thermal conductivity detector), a mass spectrometer, or the like may be used for continuous measurement.

Further, in the present invention, when measuring the total amount of hydrogen gas generated by heating coal to the dry distillation temperature T, for example, the rate of temperature rise is coal coke so as to be a condition imitating the operating state in a coke oven. It is desirable to comply with the operation of the coal and the conditions of the actual machine. In general, the rate of temperature rise of coal in carbonization in a coke oven is around 3 ° C./min, and it has been reported that the rate of gas generation may change when the rate of temperature rise is changed (Reference 3: Reference 3: Takarada et al. (1996). Effect of temperature rise rate and coal type on gas generation behavior during coal thermal decomposition Iron and steel Vol.82, 388-392.) When the gas generated by changing the temperature in the range of 3 to 20 ° C./min was investigated, no particular change was observed in the amount of hydrogen gas generated. Therefore, the rate of temperature rise when measuring the total amount of hydrogen gas can be arbitrarily set at least within this range.

FIG. 2 shows a graph in which the generation behavior of hydrogen gas was continuously measured using the gas monitoring device of FIG. 1 for some coals. It can be seen that the generation of hydrogen gas starts from about 400 ° C. and continues to the dry distillation temperature T of about 1000 to 1100 ° C. In general, when changing from coal to coke, the transition from the molten state to solidification is mainly at 600 ° C. or higher, which is considered to be due to the development of aromatic condensed rings. Since this reaction is a dehydrogenation reaction as H ₂ , the Vitrinit reflectance Ro, which is an index indicating the degree of coalification, is evaluated based on the amount of hydrogen gas generated per unit mass of coal (H ₂ ). I thought I could do it.

Here, as shown in FIG. 2, for example, when hydrogen gas is detected at a concentration (ppm) using a gas monitoring device, the value obtained by multiplying the carrier gas flow rate by the hydrogen gas concentration is time-accumulated to integrate the hydrogen gas. The amount of gas generated can be obtained, and this can be converted into the amount of hydrogen gas generated per unit mass of coal. Further, when measuring the total amount of hydrogen gas generated by heating to the dry retention temperature T, the total amount of hydrogen gas generated when heating from room temperature to the dry retention temperature T may be totaled, but hydrogen Since the gas is generated from about 400 ° C., the amount of hydrogen gas generated when the gas is heated from 400 ° C. to the dry distillation temperature T may be totaled in consideration of work efficiency and the like. Furthermore, even when the hydrogen gas generated between 600 ° C. and the dry distillation temperature T is totaled based on the timing at which the coal moves from the molten state to the solidification state, it is good with the vitrinit reflectance Ro of the coal. Correlation is maintained. The dry distillation temperature T is about 1000 to 1100 ° C. as described above in terms of general coke production conditions.

Further, in the present invention, regarding the hydrogen generation index used to obtain the correlation equation with the Vitrinit reflectance Ro, for example, the hydrogen gas generation amount (H ₂ ) per unit mass of the coal obtained as described above is directly used as hydrogen. It may be used as the generation index, but the hydrogen gas generation amount (H ₂ ) divided by the total hydrogen amount (Hdaf) in the coal on an anhydrous ashless basis may be used as the hydrogen generation index. Alternatively, the hydrogen gas generation amount (H ₂ ) divided by the atomic number ratio (H / C) of hydrogen and carbon in the coal may be used as the hydrogen generation index. As the hydrogen generation index, i) the amount of hydrogen gas generated per unit mass of coal (H ₂ ) is used, and ii) this amount of hydrogen gas generated (H ₂ ) is captured as a ratio to the total amount of hydrogen in coal (Hdaf). Or, iii) Correlation with the Vitrinit reflectance Ro can be obtained by grasping it as a ratio to the atomic number ratio (H / C), which is also used as an index of the degree of coalification. In particular, ii) the hydrogen generation index obtained by dividing the amount of hydrogen gas generated (H ₂ ) by the total amount of hydrogen in coal (Hdaf), and iii) the amount of hydrogen gas generated (H ₂ ) divided by the number of H and C atoms in coal. When the hydrogen generation index divided by the ratio (H / C) is used, the correlation with coal having a low Vitrinit reflectance Ro can be improved. Therefore, it is not a high-quality coal such as strong caking coal or caking coal, but a low-grade inferior quality that tends to include errors by the method specified by JIS, such as non-slightly caking coal and coal with inferior quality. Highly accurate estimates for coal, specifically coal with a Vitrinit reflectance Ro of around 0.8 and less than that (for example, coal with Ro of 0.85 or less or Ro of 0.8 or less). You will be able to get it.

Here, the total amount of hydrogen (Hdaf) in coal on an anhydrous ash-free basis represents the mass ratio (mass%) of hydrogen (H) among the components contained in coal excluding water and ash. be. The atomic number ratio of hydrogen to carbon (H / C) in coal represents these atomic number ratios in an anhydrous ashless base state. All of these can be determined by elemental analysis of coal specified in JIS M8813-2004.

In the present invention, the Vitrinit reflectance Ro can be estimated for the actual coal when actually producing coke, based on the correlation formula obtained as described above. That is, in the same manner as when the correlation formula was obtained using the test coal, the total amount of hydrogen gas generated by heating the actual coal to the dry distillation temperature T was measured, and the hydrogen gas per unit mass of the actual coal was measured. The amount of generation (H ₂ ) may be obtained, and the Vitrinit reflectance Ro may be obtained from the hydrogen generation index based on the amount of hydrogen gas generated (H ₂ ) using a correlation equation. In this way, if the correlation equation between the hydrogen generation index based on the amount of hydrogen gas generated (H ₂ ) and the Vitrinit reflectance Ro is obtained in advance, in actual operation, a dedicated measuring device as specified by JIS can be used. It becomes possible to easily and quickly obtain the Vitrinit reflectance Ro without using or performing complicated work, and moreover, it is possible to obtain a more objective estimated value of the result regardless of the individual difference of the measurer. Can be done.

Test coals 1 to 20 having properties by industrial analysis and elemental analysis shown in Table 1 were prepared. Here, the volatile matter VM (mass%, dry) in the table is obtained by the volatile matter quantification method specified in the industrial analysis method of JIS M8812-2006, and the ash content (mass%, dry) is the same. It represents the mass fraction of the amount of ash remaining when heated and ashed under the conditions specified in this industrial analysis method. In each case, the sample was air-dried (JIS M8811-2000) and then at 107 ° C. for 1 hour. It was obtained after drying. On the other hand, C and H represent the anhydrous ashless-based mass fraction (mass%, daf) obtained by the method specified in the elemental analysis method of JIS M8813-2004, respectively. Further, for these test coals 1 to 20, the average maximum reflectance Ro (%) of Vitrinit was calculated by the reflectance measuring method specified in JIS M8816-1992. At that time, it took about 10 to 15 days to obtain the value of one test coal.

Further, the total amount of hydrogen gas generated when each of these test coals 1 to 20 was heated to a temperature T = 1000 ° C. was measured as follows using the gas monitoring device shown in FIG. .. A 50 mg coal sample (powder) 5 placed on a quartz boat is placed in a quartz core tube 4 having an internal volume of about 40 ml, and the tubular electric furnace 6 is used to raise the temperature from room temperature to 1000 ° C. at a heating rate of 6 ° C./min. It was heated. At that time, nitrogen was flowed as carrier gas 1 at a flow rate of 100 ml / min (gas pressure: 0.1 MPa) through the gas purifier 2 and the flow meter 3, and the coal sample 5 in the core tube 4 was in a constant nitrogen stream. It was made to be heated. Then, the hydrogen gas (H ₂ ) generated from the coal sample 5 is continuously measured by the semiconductor (SnO ₂ ) type hydrogen gas sensor 8 (measurement interval is 1 second), and the hydrogen gas concentration (generated from the coal sample 50 mg). Hydrogen gas concentration: ppm) was determined. An example of the hydrogen gas generation profile at this time is shown in FIG. Further, with respect to the hydrogen gas detected by the hydrogen gas sensor 8, the total amount of hydrogen gas generated from each coal when heated from room temperature to 1000 ° C. is obtained based on the calibration line prepared in advance with the standard gas. The amount of hydrogen gas generated per unit mass (per 50 mg of coal sample) was defined as (H ₂ : ml / 50 mg). The results are shown in Table 1.

Therefore, for the test coals 1 to 20, first, the hydrogen gas generation amount (H ₂ ) per unit mass obtained as described above is set as the hydrogen generation index (hereinafter referred to as "index A"), and this hydrogen generation is performed. The graph of the relationship between the index A and the vitrinit reflectance Ro is as shown in FIG. As can be seen from this graph, these have a good correlation, with the Vitrinit reflectance (average maximum reflectance) Ro (%) as the horizontal axis (x) and the hydrogen generation index A (H ₂ : ml /). If 50 mg) is the vertical axis (y), it can be expressed by the correlation equation of the following equation (1).
y = 12.8x + 8.3 (coefficient of determination R ² = 0.9653) ・ ・ ・ (1)

In addition, as the hydrogen generation index, H ₂ / Hdaf (hereinafter referred to as "index B") obtained by dividing the amount of hydrogen gas generated per unit mass (H ₂ ) by the total amount of hydrogen in coal (Hdaf) on an anhydrous ashless basis. The graph in the case of using (called) is shown in Fig. 4, and the amount of hydrogen gas generated per unit mass (H ₂ ) is divided by the atomic number ratio (H / _C ) of hydrogen and carbon in coal. A graph in the case of using / (H / C) (hereinafter referred to as “index C”) is shown in FIG. In these graphs as well, the hydrogen generation index (B, C) and the vitrinit reflectance Ro each show a good correlation, and FIG. 4 can be represented by the correlation equation of the following equation (2), and FIG. 5 Can be expressed by the correlation formula of the following formula (3). When the coefficients of determination R ² are arranged in descending order for the graphs obtained in FIGS. 3 to 5, the correlation equations (3), (1), and (2) are obtained in that order.
y = 3.5x + 0.54 (coefficient of determination R ² = 0.9612) ・ ・ ・ (2)
y = 28.6x + 0.97 (coefficient of determination R ² = 0.9694) ・ ・ ・ (3)

By the way, the results of investigating the relationship between the volatile matter (VM) and the vitrinit reflectance Ro, which are generally used in evaluating the characteristics of coal, in the test coals 1 to 20 are as shown in the graph shown in FIG. Yes (coefficient of determination R ² = 0.9355). Compared with this, it can be seen that the correlation with the vitrinit reflectance Ro is better when the above hydrogen generation indices A, B and C are used.

On the other hand, from the test coals 1 to 20, only those having a vitrinit reflectance Ro of 0.85 or less measured by the method specified in JIS are selected, and the above hydrogen generation indices A, B and C are used to select each of them. The graph of the relationship with the vitrinit reflectance Ro is as shown in FIGS. 6, 7 and 8. Here, the correlation equation of FIG. 6 can be expressed by the following equation (4), similarly, FIG. 7 can be expressed by the following equation (5), and FIG. 8 can be expressed by the following equation (6). When the coefficients R ² are arranged in descending order, the correlation equations (6), (5), and (4) are obtained.
y = 7.2x + 12.1 (coefficient of determination R ² = 0.5479) ・ ・ ・ (4)
y = 2.1x + 1.5 (coefficient of determination R ² = 0.7679) ・ ・ ・ (5)
y = 27.3x + 4.2 (coefficient of determination R ² = 0.9144) ・ ・ ・ (6)

Incidentally, even when the Vitrinit reflectance Ro is 0.85 or less, the result of investigating the relationship between the volatile matter (VM) of the test coal and the Vitrinit reflectance Ro is as shown in the graph shown in FIG. 10 (). The coefficient of determination R ² = 0.8338).

As described above, according to the present invention, the hydrogen generation index based on the amount of hydrogen gas generated per unit mass (H ₂ ) of coal and the Vitrinit reflectance Ro show a good correlation. By obtaining the hydrogen generation index based on the amount of hydrogen gas generated per unit mass (H ₂ ), it becomes possible to obtain the Vitrinit reflectance Ro more easily and quickly. In particular, when calculating the hydrogen generation index, it takes about 3 hours to measure the amount of hydrogen gas generated per unit mass of coal (H ₂ ), and the others are industrial analysis and elemental analysis specified by JIS. Since the results can be used, the Vitrinit reflectance Ro can be obtained in a significantly shorter time than the method specified in JIS. Moreover, according to the present invention, it becomes possible to obtain an more objective estimated value of the result without being influenced by the skill level and skill of the measurer.

1: Carrier gas, 2: Gas refiner, 3: Flow meter, 4: Core tube, 5: Sample (coal), 6: Tubular electric furnace, 7: Tar trap, 8: Hydrogen gas sensor, 9: Recorder.

Claims (3)

A method for estimating the vitrinit reflectance Ro of coal.
For a plurality of test coals having a known Vitrinit reflectance Ro, the total amount of hydrogen gas generated by heating to the dry distillation temperature T when coke is produced is measured in advance, and hydrogen per unit mass of the test coal is measured. The amount of gas generated (H ₂ ) is obtained, and the amount of hydrogen gas generated (H ₂ ) is used as the hydrogen generation index to obtain a correlation equation between the hydrogen generation index and the Vitrinit reflectance Ro.
For real coal whose Vitrinit reflectance Ro is unknown, the total amount of hydrogen gas generated by heating to the dry distillation temperature T is measured, and hydrogen generation consisting of the amount of hydrogen gas generated per unit mass of the real coal (H ₂ ) is generated. A method for estimating the Vitrinit reflectance Ro, which comprises obtaining an exponent and estimating the Vitrinit reflectance Ro from the correlation equation. A method for estimating the vitrinit reflectance Ro of coal.
For a plurality of test coals having a known Vitrinit reflectance Ro, the total amount of hydrogen gas generated by heating to the dry distillation temperature T when producing coke is measured in advance, and hydrogen per unit mass of the test coal is measured. The amount of gas generated (H ₂ ) is obtained, and the amount of hydrogen gas generated (H ₂ ) divided by the total amount of hydrogen in coal (Hdaf) on an anhydrous ashless basis is used as the hydrogen generation index. Obtain a correlation formula with the Vitrinit reflectance Ro,
For real coal whose Vitrinit reflectance Ro is unknown, the total amount of hydrogen gas generated by heating to the dry distillation temperature T is measured, and the amount of hydrogen gas generated per unit mass of the real coal (H ₂ ) is anhydrous and ashless. A method for estimating the Vitrinit reflectance Ro, which comprises obtaining the hydrogen generation index divided by the total amount of hydrogen in coal (Hdaf) at the base and estimating the Vitrinit reflectance Ro from the correlation equation. A method for estimating the vitrinit reflectance Ro of coal.
For a plurality of test coals having a known Vitrinit reflectance Ro, the total amount of hydrogen gas generated by heating to the dry distillation temperature T when producing coke is measured in advance, and hydrogen per unit mass of the test coal is measured. The amount of gas generated (H ₂ ) is obtained, and the amount of hydrogen gas generated (H ₂ ) divided by the ratio of the number of atoms of hydrogen to carbon (H / C) in coal is used as the hydrogen generation index . Obtain a correlation equation between hydrogen and Vitrinit reflectance Ro,
For real coal whose Vitrinit reflectance Ro is unknown, the total amount of hydrogen gas generated by heating to the dry distillation temperature T is measured, and the amount of hydrogen gas generated per unit mass of the real coal (H ₂ ) is calculated in the coal. A method for estimating the Vitrinit reflectance Ro, which comprises obtaining the hydrogen generation index divided by the atomic number ratio (H / C) of hydrogen and carbon and estimating the Vitrinit reflectance Ro from the correlation equation.

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