JPH08143867A - Estimation of production ratio of coal carbonization product - Google Patents

Abstract

PURPOSE: To measure the relative value of coal as a raw material for coke by estimating the cake, tar, etc., which are carbonization products from the volatile matter(VM) of the coal and ratio (O/C) of the number of atoms (oxygen/carbon) in the coal and estimating the production ratio of the coal carbonization products with a good accuracy. CONSTITUTION: The production ratio of coke, tar, light oil, gases, ammonia liquor and carbon which are carbonization products of coal and the generated gas volume expressed in terms of 4800kcal/Nm<3> are estimated from the VM, and the ratio O/C therein in carbonizing the coal in a chamber oven type cake oven and the production ratio of the coal carbonization product is estimated. Furthermore, the VM and O/C are measured to calculate the coke production ratio (%d) from formula I. When the ratio O/C is lower than 1.2, the tar production ratio is calculated from formula II. When the ratio O/C is higher than 1.2, the tar production ratio is calculated from formula III and the light oil production ratio is calculated from formula IV. The gas, ammonia liquor and carbon production ratios and the generated gas volume (Nm<3> /t dry coal) expressed in terms of 4800kcal/Nm<3> are preferably calculated in the similar manner as that of coke production ratio, etc.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to the production rate of coal carbonization products in a chamber-type coke oven and to a production rate of 4800 kcal / N.
The present invention relates to a method for estimating the generated gas volume by converting the calorific value into m ³ .

[0002]

2. Description of the Related Art When coal is inserted into a coke oven and carbonized,
Coke, tar, light oil, gas, cheap water, and carbon are produced. Estimating the production rate of these products is
It is extremely important not only for proper operation management but also for evaluating the value of coking coal.

In the past, the rate of formation of such coal carbonization products was estimated as a function of coal-based volatiles (VM) on a dry basis (see, for example, A. Haarmann: Brennn).
stoff Chemie, Vol. 37 (1956)
301. ). That is, the more VMs the coal has, the lower the coke production rate, the tar production rate, the light oil production rate, the gas production rate,
The production rate of coal carbonization products is estimated from the relational equations for the production rate of low-water and the production rate of low-water and the rate of production of low-water.

By the way, in recent years, in order to reduce the cost of producing coke, the use ratio of non-fine coking coal as the coking coal has increased. However, when non-slightly caking coal was used, it was found that the production rate of the dry-distilled product showed a unique behavior such as the calorific value of the produced gas lower than the expected value. As a method for estimating the production rate of the dry distillation products when such non-slightly caking coal is used, JP-A-3-239794 and JP-A-3-2 are known.
Japanese Patent No. 39792 proposes a method of estimating not only the volatile matter of coal but also the atomic number ratio (O / C) of (oxygen / carbon) of coal.

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In Japanese Patent Laid-Open No. 4 and Japanese Patent Laid-Open No. 3-239792,
The generation ratio of coal carbonization products was studied for non-caking coals having an atomic ratio (O / C) of (carbon / oxygen) of less than 0.12, and volatile matter (VM) and O / C of coal were investigated. An equation for estimating the yield of dry distillation products based on the above was proposed.

By the way, at present, in order to further reduce the cost of producing coke, it is desired to further increase the use ratio of non-slightly caking coal. In order to further increase the usage rate of non-caking coal, non-caking coal with O / C ≧ 0.12 may be considered as a coking coking coal. Here, the coking coal is a coal used for coke production. In addition, non-caking coal is JIS M 8
The maximum fluidity logarithmic value (MF) measured by the Giessler-Plastometer method specified in 801 is less than 1.0, and the average reflectance (Ro) of coal measured by the reflectance measurement method of JIS M 8816 is 0. .7 or less coal.

It is an object of the present invention to provide a method capable of accurately estimating the yield of coal carbonization products even with O / C ≧ 0.12.

[0008]

In order to solve the above problems, in the method for estimating the production rate of coal carbonization products of the present invention, when coal is carbonized in a chamber furnace type coke oven having a furnace temperature of 1220 ° C. The production of coke, tar, gas oil, gas, ammonium hydroxide and carbon, which are carbonization products of coal from the volatile matter (VM) of coal and the atomic ratio (O / C) of (oxygen / carbon) in the coal. Rate and 4800 kcal / Nm ³ conversion generated gas volume are characterized.

Specifically, the VM and O / C of coal are measured, the coke production rate (% d) is calculated from the following equation (1), and the tar production rate (% d) is calculated as (2) or ( 3), the light oil production rate (% d) is calculated from (4),
The gas production rate (% d) is calculated from the equation (5) or (6), the low water production rate (% d) is calculated from the equation (7) or (8), and the carbon production rate (% d) is calculated as Calculated from equation 9),
Generated gas volume of 4800 kcal / Nm ³ (Nm ³ /
t dry coal) is calculated from the equation (10) or (11), which is a method for estimating the production rate of the above-mentioned coal carbonization products.

Coke yield (% d) = − 0.838 × VM (% d) +98.43 (1) (for coal with O / C <0.12) Tar yield (% d) = 0 .2425 × VM (% d) −2.57 × O / C (−) − 1.11 (2) (for O / C ≧ 0.12 coal) Tar yield (% d) = 0 .1415 × VM (% d) −101.9 × O / C (−) + 1.93 (3) Light oil yield (% d) = 0.0440 × VM (% d) −0.45 ... -(4) (In the case of coal with O / C <0.12) Gas yield (% d) = 0.289 x VM (% d) +5.94 (5) (O / C≥0.12 In case of coal) Gas yield (% d) = 0.441 x VM (% d) + 58.64 x O / C (-)-6.48 (6) (O / C < .12 coal) Yasumizu yield (% d) = 0.166 x VM (% d) +14.09 x O / C (-)-1.78 (7) (O / C ≧ 0 .12 coal) Yasumizu yield (% d) = 0.115 x VM (% d) + 54.78 x O / C (-) -4.40 (8) Carbon yield (% d) = 0.0965 × VM (% d) -11.52 × O / C (−) − 1.03 (9) (in the case of coal with O / C <0.12) 4800 kcal / Nm ³ conversion generation Gas volume (Nm ³ / t dry coal) = 4.805 × VM (% d) −567.4 × O / C (−) + 184.9 (10) (Coal with O / C ≧ 0.12 if) 4800kcal / Nm ³ in terms generated gas volume (Nm ³ / t dry coal) = 6.225 × VM (% d ) -952.6 × O / C (-) + 1 1.0 (11) where the% d indicates the weight percent of dry coal basis. Again 48
The generated gas volume converted to 00 kacL / Nm ³ is 4800 kac1 / Nm ³ converted generated gas volume = generated gas volume (Nm ³ / t dry coal) × generated gas calorific value (kcal)
/ Nm ³ ) / 4800 (kcal / Nm ³ ).

The Nm ³ / t dry charcoal means the volume (Nm ³ ) of the standard state standard gas generated from 1 t of dry charcoal.

[0012]

In the invention of the method for estimating the production rate of coal carbonization products according to the present invention, first, 21 kinds of coals including coals having an atomic ratio (O / C) of (oxygen / carbon) of 0.12 or more. The production rate of the dry-distilled product of was measured by the coal dry-distillation product production rate measuring apparatus with a tar decomposition furnace shown in FIG.

In the figure, 1 is a coal carbonization furnace, 2 is a tar cracking furnace,
3 is a coal carbonization crucible, 4 is a tar decomposition crucible, 5 is an ice-cooled tar pot, 6 is a tar recovery system, 7 is a filter, 8
Indicates a dry gas meter, and 9 indicates a Tedlar bag.

The coal which is the object of the present invention has a volatile matter (VM) on an anhydrous basis of 16-49% and an O / C of 0.01-.
Coal in the range of 0.14.

Conventionally, coke obtained by carbonization of coal,
The production rates of tar, light oil, gas, and cheap water were estimated by VM. There was no way to estimate the carbon production rate. In this conventional method, the higher the VM, the lower the coke yield, and the higher the production rate of tar, light oil, gas, and ammonium hydroxide.

Here, the coke is a lumpy solid product obtained by dry distillation of coal. Tar is a liquid product obtained by dry distillation of coal, which remains without being evaporated as a result of distillation to 180 ° C. Light oil is an oil component that evaporates as a result of distillation up to 180 ° C. among liquid products obtained by dry distillation of coal. Gas is a gas product obtained from carbonization of coal. Carbon is a carbon-based product that adheres to the wall of the coke oven because it is generated by thermal decomposition of liquid products such as tar produced by carbonization of coal before it is discharged to the outside of the coke oven. is there. Anhydrous water is water obtained by dry distillation of coal and contains a small amount of ammonia and phenol.

Certainly, up to 30% VM, the more volatile matter, the more coke, the less tar, light oil, gas, noble water, and carbon. Also 4800 kcal /
The volume of Nm ³ converted gas generated is large. However, volatile matter is 30%
It is known that when it becomes d or more, not only volatile components but also O / C influences, as described in JP-A-3-239794 and JP-A-3-239792.

When the VM exceeds 30%, coal in which oxygen in the coal rapidly increases appears. As a result, oxygen-containing products such as carbon monoxide, carbon dioxide, and ammonium hydroxide are rapidly increasing,
Generation of methane and tar is suppressed. As a result, the O / C of coal affects the production rate of carbonization products.

This method has been developed for coal having an O / C of less than 0.12. Even if O / C is less than 0.12, an estimation formula of carbon yield has not been proposed. Moreover, although a method of estimating the production rate of coke and light oil as a function of VM and O / C is also proposed, the present inventor has found that the O / C of coal is less than 0.12 or 0.12 or more. It was found that the production rate of light oil can be sufficiently estimated by a function of VM alone. Then, the relations between the production rate of coke and light oil and the VM were obtained by regression calculation, and the results (1) and (4) were obtained.

In developing the method for estimating the production rate of coal carbonization products of the present invention, first, O / C ≧ 0.
The production rate of carbonization products of 21 kinds of coal including 12 coals was measured by the coal pyrolysis product production rate measuring device with a tar decomposition furnace shown in FIG. 1. As a result, the tar generation rate, the gas generation rate, the low water generation rate, and the calorific value of the generated gas at 4800 kcal / Nm ³ are expressed by using different equations for O / C of less than 0.12 and 0.12 or more. It turns out that the error becomes large if it is not. When the relationship between carbon dioxide in the generated gas and O / C is examined, as shown in FIG. It was a line relationship that turns at 12. This is a document (Hatami, Osawa, Sugimura:
Fuel Association Magazine, Vol. 46 (1967) 819), the oxygen-containing functional groups such as carboxyl groups in coal have a relationship of bending around O / C = 0.12. Therefore, when the amount of carbon dioxide in the gas or the production of cheap water exceeds O2 / O2, it rapidly increases. On the other hand, tar and carbon decrease when O / C exceeds 0.12. Therefore, the relations between the tar, gas, and ammonium hydroxide production rates, and the gas generation volume of 4800 kcal / Nm ³ converted and VM and O / C are O / C <0.12 and O / C ≧.
The results (2), (3), (5), (6), (7), (8), which were obtained by the regression calculation in the case of 0.12.
Equations (10) and (11) were obtained.

The carbon production rate, VM and O /
As a result of the regression calculation of the relationship with C, formula (9) was obtained.

Since the carbonization conditions of the coal carbonization product production rate measuring device with a tar cracking furnace were slightly different from those of the actual coke oven, a correction was required to match the production rate of the carbonization product obtained in the actual coke oven. is necessary. As an average dry distillation condition of an actual coke oven, it was assumed that dry distillation was carried out at a furnace temperature of 1220 ° C. in a chamber furnace type coke oven having a furnace height of 5.2 m, a furnace length of 14.8 m and a furnace width of 450 mm. Actual coke oven dry distillation product rate and 4800 k under the above conditions
As a result of comparing the value of cal / Nm ³ converted gas volume with the value obtained by a coal pyrolysis product production rate measuring device with a tar cracking furnace, if the correction in Table 1 is made, the actual dry distillation production of the coke oven under the above conditions It turned out that it can be converted into the production rate of the product.

[0023]

[Table 1]

[0024]

[Example] Using the coal dry distillation product yield measuring device with a tar decomposition furnace shown in FIG. 1, the volatile matter (VM) on an anhydrous basis is 34.72%, and the atomic number ratio (O / O) of (oxygen / carbon) (O /
C) estimated the yield of carbonization products on 0.138 coal. Since the estimated value is corrected to the average carbonization conditions of the actual furnace,
Corrected according to Table 1. The conventional method (O / C is 0.12)
The comparison with the method disclosed in JP-A-3-239794) based on the data below is also made. The results are shown in Table 2. As shown in Table 2, according to the method of the present invention, even if coal having an O / C of 0.12 or more, including the carbon production rate and the generated gas volume obtained by converting the calorific value into 4800 kcal / Nm ³ , the carbonized product The generation rate can be estimated.

The actually measured values are values converted to the production rate of the dry distillation products based on the actual coke oven according to Table 1 after performing the dry distillation experiment with the coal pyrolysis test device with a tar decomposition furnace shown in FIG.

[0026]

[Table 2]

[0027]

EFFECT OF THE INVENTION According to the method of the present invention, the carbon production rate and the production rate of carbonization products are accurately obtained even with coal having an O / C of 0.12 or more including the volume of generated gas obtained by converting the calorific value to 4800 kcal / Nm ^3. As can be estimated, the relative value of coal as a raw material for coke production can be compared with that of coal having an O / C of 0.12 or more, as well as the coal having an O / C of less than 0.12. ..

[Brief description of drawings]

FIG. 1 is a schematic view of a coal carbonization yield measuring device equipped with a tar decomposition furnace.

FIG. 2 v of carbon dioxide in gas generated during coal carbonization
The figure which shows the relationship of ol% and O / C of coal.

[Explanation of symbols]

1 ... Coal carbonization furnace 2 ... Tar decomposition furnace 3 ... Coal carbonization crucible 4 ... Tar decomposition crucible 5 ... Ice-cooled tar pot 6 ... Tar recovery system 7 ... Filter 8 ... Dry gas meter 9 ... Tedlar bag

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[Procedure amendment]

[Submission date] December 12, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 1

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

[0008]

In order to solve the above problems, in the method for estimating the production rate of coal carbonization products according to the present invention, when the coal is carbonized in a room furnace type coke oven, the volatile components of the coal are Coke, which is a carbonization product of (VM) and the atomic ratio (O / C) of (oxygen / carbon) in the coal,
It is characterized by estimating the production rates of tar, light oil, gas, cheap water, carbon, and the generated gas volume in terms of 4800 kcal / Nm ³ .

Claims (2)

[Claims] 1. When coal is carbonized in a chamber furnace type coke oven having a furnace temperature of 1220 ° C., from the volatile matter (VM) of the coal and the atomic ratio (O / C) of (oxygen / carbon) in the coal, Coke, tar, light oil, gas, ammonium hydroxide, which are carbonization products of coal.
A method for estimating the production rate of coal carbonization products, which comprises estimating the production rate of carbon and the volume of evolved gas at 4800 kcal / Nm ³ . 2. The VM and O / C of coal are measured, the coke production rate (% d) is calculated from the equation (1), and the tar production rate (% d) is calculated from the equation (2) or (3). Then, the gas oil production rate (% d) is calculated from the equation (4), the gas production rate (% d) is calculated from the equation (5) or (6), and the low water production rate (% d) is calculated from the equation (7). or (8) calculated from the formula, the carbon generation rate (% d) (9) calculated from the equation, 4800kcal / Nm ³ in terms generated gas volume (Nm ³ /
t dry coal) is calculated by the equation (10) or (11). The method for estimating the production rate of coal carbonization products according to claim 1, wherein the coke yield (% d) = -0.838 x VM. (% D) +98.43 (1) (for coal with O / C <0.12) Tar yield (% d) = 0.2425 × VM (% d) −2.57 × O / C (−) − 1.11 (2) (In the case of coal with O / C ≧ 0.12) Tar yield (% d) = 0.1415 × VM (% d) −101.9 × O / C (−) + 13.93 (3) Light oil yield (% d) = 0.0440 × VM (% d) −0.45 (4) (In the case of O / C <0.12 coal ) Gas yield (% d) = 0.289 x VM (% d) + 5.94 (5) (for coal with O / C ≥ 0.12) Gas Retention (% d) = 0.441 x VM (% d) + 58.64 x O / C (-)-6.48 (6) (for coal with O / C <0.12) Ansui Yield (% d) = 0.166 x VM (% d) +14.09 x O / C (-)-1.78 (7) (for coal with O / C ≥ 0.12) Ansui Yield (% d) = 0.115 × VM (% d) + 54.78 × O / C (−)-4.40 (8) Carbon yield (% d) = 0.0965 × VM (% d) ) -11.52 × O / C (- ) - 1.03 ··· (9) ( If the O / C <0.12 coal) 4800kcal / Nm ³ in terms generated gas volume (Nm ³ / t dry coal ) = 4.805 × VM (% d) −567.4 × O / C (−) + 184.9 (10) (for coal with O / C ≧ 0.12) 4800 kca / Nm ³ in terms generated gas volume (Nm ³ / t dry coal) = 6.225 × VM (% d ) -952.6 × O / C (-) + 171.0 ··· (11)