KR20160149648A - Method of manufacturing coke - Google Patents

Method of manufacturing coke Download PDF

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Publication number
KR20160149648A
KR20160149648A KR1020150086976A KR20150086976A KR20160149648A KR 20160149648 A KR20160149648 A KR 20160149648A KR 1020150086976 A KR1020150086976 A KR 1020150086976A KR 20150086976 A KR20150086976 A KR 20150086976A KR 20160149648 A KR20160149648 A KR 20160149648A
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South Korea
Prior art keywords
coal
amount
coke
heat
calorific value
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KR1020150086976A
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Korean (ko)
Inventor
최주희
서종범
안진영
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현대제철 주식회사
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Priority to KR1020150086976A priority Critical patent/KR20160149648A/en
Publication of KR20160149648A publication Critical patent/KR20160149648A/en

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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
    • C10B57/12—Applying additives during coking
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
    • C10B57/04—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition
    • C10B57/06—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition containing additives

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Coke Industry (AREA)

Abstract

An invention relating to a coke making method is shown. The method for producing coke includes the steps of: calculating a first amount of a calorific value for a compounding coal from a database of carbon content of each coal; Calculating a second amount of calorific heat that reflects the influence of the factor of the drying process on the first amount of the first amount of heat; And introducing the second amount of calorific value into a coke oven charged with coal to produce the coke.

Description

METHOD OF MANUFACTURING COKE [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing coke, and more particularly, to a method for producing coke by estimating a calorific value of a coke.

Coke is a fuel used as a heat source for blast furnaces and serves as a reducing agent for reducing iron ores. Coke is produced by charging coal into a coke oven and keeping it at high temperature while the outside air is shut off.

Prior art related to the present invention is Korean Patent Laid-Open Publication No. 1997-0042956 (published on July 26, 1997, entitled " Process for the production of coke for blast furnaces).

An object of the present invention is to provide a coke making method capable of reducing the manufacturing cost while preventing deterioration in quality. However, these objects are illustrative and not intended to limit the scope of the present invention.

In order to accomplish the above object, the present invention provides a method for producing coke, comprising the steps of: calculating a first amount of dry heat for a blend from a database of the dry type of coal by burning type; 2) calculating the calorific value of the carbon dioxide, and injecting the second calorific value into the coke oven charged with coal to produce the coke.

In the coke making method, the first amount of the amount of carbon monoxide is a value obtained by weighted averaging the amount of carbon monoxide in each coal according to the blend ratio of the coal, and the drying process operation factor includes moisture, charging density and furnace can do.

In the above coke manufacturing method, the database of the carbon type calories of the coal type includes the calorific value of coal according to the coal type measured at a moisture content of 0.9% to 1.1%, a charging density of 750 kg / m 3 , and a temperature of 1000 ° C, 2 The calorific value of the carbon monoxide can be determined by the following formula (1). However, each unit has the following values: Kcal (kg-coal) -1 , water content:%, loading density: kg / m 3 ,

(Equation 1)

(Kg-coal) -1 (%) -1 x (water content - 1%) - 0.12 Kcal (kg-coal) ) -1占 (750 kg / m 3 ) -1占 (charging density-750 kg / m 3 ) + 1.1 占 kg-coal -1占 (占 폚 -1 )

In the coke making method, the steps may be performed in real time according to the mixing ratio of the compounding coal or the change in the operation factor of the carbonization process.

Wherein the step of calculating the calorific heat of the coke comprises the step of calculating the calorific value of the coke by controlling the temperature of the second internal heater and the temperature of the second internal heater while keeping the first internal heater and the second internal heater, Calculating a calorific value by measuring the amount of heat generated in the first internal heater in a state in which heat generated in the first internal heater disposed inside the internal heater is transferred to the reaction tube and used only for the dry- . ≪ / RTI >

According to the coke making method of the present invention, the amount of the calorific heat can be calculated and input in real time according to the mixing of the blast furnace and the dry running operation parameters, . Of course, the scope of the present invention is not limited by these effects.

FIG. 1 is a graph showing the result of measurement of carbon monoxide heat of coal according to the volatile content of each carbon in a coke making method according to an embodiment of the present invention.
FIG. 2 is a graph showing a comparison between a calculated value and an actual measured value of the amount of dry heat of each compound in a coke making method according to an embodiment of the present invention.
FIG. 3 is a graph showing influences of operating factors on the calorific heat of a coke according to an embodiment of the present invention.
4 is a schematic diagram illustrating an apparatus for measuring a calorific value in a coke making process according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to be exemplary, self-explanatory, allowing for equivalent explanations of the present invention.

The coke is produced by charging coal into a coke oven and disturbing the outside air at a high temperature of 1000 ° C or higher. In normal operation, the coke utilization rate is determined according to the target production amount, and thus the time for the carbonization is determined. In addition, the target temperature is set according to the duration of the carbonization time, and the amount of heat input is calculated to match the target temperature.

On the other hand, the carbonization of the coke is completed when the temperature of the coke reaches about 950 ° C or more. The amount of heat required to raise the charged coal to 950 ° C may vary depending on the type and characteristics of the coal, the charging density, the moisture, and the temperature of the coal stream. The calorific value is the amount of heat required to heat the charged coal to 950 ° C.

If the amount of heat input is insufficient, the quality of the coke is deteriorated because the coke is unstable, and in case of over-heating, the cost of manufacturing the coke increases due to the amount of heat added.

Accordingly, the present invention proposes a method of manufacturing coke that can reduce the manufacturing cost while preventing deterioration of coke quality by providing a method of accurately calculating the amount of heat input required for the dry process of the compounding coal.

Accordingly, one aspect of the present invention relates to a coke making process comprising a method for estimating the calorific value of dry matter. The method for producing coke includes a first step (S1) of calculating a first amount of carbon monoxide to be compounded from a database of coal-type digestible calories; A second step (S2) of calculating a second amount of the calorific heat reflecting the influence of the factor of the drying process on the first amount of calories; And a third step (S3) of supplying the second amount of the calorific heat to the coke oven charged with coal to produce the coke.

In particular, the method for estimating the calorific value may include a first step (S1) and a second step (S2), and an operation control unit for performing the calculation may be introduced into the coke producing apparatus.

FIG. 1 is a graph showing the result of measurement of carbon monoxide heat of coal according to the volatile content of each carbon in a coke making method according to an embodiment of the present invention.

Referring to FIG. 1, in the first step (S1), as the volatile content (VM) increases, the amount of heat required for pyrolysis of volatile components increases, thereby increasing the calorific value. The regression equation for this can be expressed by the following equation (2). Here, the unit of the calorific value is Kcal · (kg-coal) -1 , the unit of the volatile content is%, and the constants 1.84 and 317.59 are the unit values of the unit calorific value . In particular, the unit of the calorific value may refer to the amount of heat required to make 1 kg of coal into coke.

(Equation 2)

Y (calorific value) = X (volatile content) x 1.84 + 317.59; (Determination coefficient R 2 = 0.7682)

On the other hand, the calorific value of the dry matter varies depending on the type of coal, and it is necessary to calculate the dry calorific value of the mixture based on the data on each coal. In FIG. 1, the same denominations are displayed so as to have the same color and shape. The calorific value of the combined coal can be calculated by weighted averaging the calories of each coal according to the blend ratio.

FIG. 2 is a graph showing a comparison between a calculated value and an actual measured value of the amount of dry heat of each compound in a coke making method according to an embodiment of the present invention.

Referring to FIG. 2, the calculated values and the measured values for the six combinations are shown, and it can be confirmed that the calculated values and the measured values are in good agreement with each other. The regression equation for this can be expressed by Equation 3 below. Here, the unit of the calorific value is Kcal · (kg-coal) -1 and the constant value of 56.22 is the unit value of the final calorific value so that the unit of the calorific value can be derived.

(Equation 3)

Y (measured value of the calorific value of the calorific value) = X (calorific value of the calorific value) × 1.15 - 56.22; (Determination coefficient R 2 = 0.8785)

In the actual operation, it is possible to easily derive the calorific value of the combined carbon from the database of the accumulated carbon-based calorific values by the above-mentioned method.

Hereinafter, the second step S2 of the coke making method according to an embodiment of the present invention will be described. In the present invention, the tendency was determined by changing the moisture content, the charging density, and the carbonization temperature (roon temperature) in order to confirm the effect of the operating factor on the calorific value of the carbon monoxide.

Factors other than test variables were fixed to individually confirm the effect of each factor. The basic conditions were set as 1 ± 0.1% moisture, a loading density of 750 kg / m 3 , and a temperature of 1000 ° C. On the other hand, it figures 1 and each of the Ammo and blended dry distilled carbon calorimetry conditions 1 ± 0.1% water, charged to a density 750kg / m 3, dry distillation temperature (roon) 1000 ℃ according to Figure 2.

FIG. 3 is a graph showing influences of operating factors on the calorific heat of a coke according to an embodiment of the present invention.

Referring to FIG. 3, the results are shown in Table 1, which shows a rise of 6.5 kcal / kg-coal per 1% of water, a decrease of 1.2 kcal / kg-coal per 10 kg / m3 of loading density, and a rise of 11 kcal / kg- .

Specifically, the regression equation related to moisture can be expressed by Equation 4, the regression equation relating to charging density can be expressed by Equation 5, and the regression equation relating to furnace can be expressed by Equation 6. Here, the unit of the calorific value is Kcal (kg-coal) -1 , the unit of water is%, the unit of charging density is kg / m 3 , the unit of furnace is ° C, The calculated result value may have a proper unit value so that the unit of the calorific value can be derived.

(Equation 4)

Y (dry calorific value) = X (water content) x 6.25 + 348.35; (Determination coefficient R 2 = 0.966)

(Equation 5)

Y (calorific value) = X (charging density) x -0.12 + 442.33; (Determination coefficient R 2 = 0.989)

(Equation 6)

Y (calorific value) = X (roon) x 0.09 + 264.50; (Determination coefficient R 2 = 0.964)

Based on these results, it is possible to express the method of estimating the second calorific value, which takes into consideration the amount of the calorific value of each of the components and the operating conditions. That is, the item Σ (compounding ratio by type of coal × dry matter content by type) expressed in Equation 1 corresponds to the first amount of dry heat for the blend as described with reference to FIGS. 1 and 2, and the second dry heat amount corresponds to the first dry amount It is a value calculated by reflecting the influence of the factor of the dry process on the calorific value.

(Equation 1)

+2.5 x (water-1) - 0.12 x (charging density-750) + 1.1 x (furnace-1000) Secondary Calorific Calorie = {Σ

Here, the unit of the calorific value is Kcal · (kg-coal) -1 , the unit of moisture is%, the unit of charging density is kg / m 3 , and the unit of furnace is ° C.

Further, each constant has an appropriate predetermined unit value so that the unit of the resultant value of the calorific value can be derived. For example, the constant 6.5 is Kcal · (kg-coal) -1 · (%) -1 , Constant 1 has units of%, constant 0.12 has unit of Kcal · (kg-coal) -1 · (750 kg / m 3 ) -1 and constant 750 unit of kg / m 3 , The constant 1.1 has units of Kcal · (kg-coal) -1 · (° C) -1 , and the constant 1000 has units of ° C.

FIG. 4 is a diagram schematically illustrating an apparatus for measuring the above-described calorific value in the coke making method according to an embodiment of the present invention. The above-described measurement of the amount of the calorific heat can be performed using the measuring apparatus 10 having the electric furnace composed of the double heater shown in Fig.

The measuring apparatus 10 includes a reaction tube 12 made of stainless steel in which coal (C) or the like serving as a raw material of coke can be charged, a first internal heater 11a disposed around the reaction tube 12, A heater 11b, and a thermocouple 18 for measuring the temperature. Further, the measuring apparatus 10 may further include a reaction tube lid 14, a gas outlet 16, and the like.

The step of calculating the above-described calorific value of the amount of the carbon monoxide includes the steps of: measuring a first internal heater 11a and a second internal heater 11a which are arranged in the circumference of the reaction tube 12 charged with the coal (C) The heat generated in the first internal heater 11a disposed inside the second internal heater 11b is transferred to the reaction tube 12 to be used only for the carbonization of the coal C while the first internal heater 11b is kept at the same temperature, And calculating the amount of the calorific heat by measuring the amount of heat generated in the first internal heater 11a. A calorimeter may be installed in the first internal heater 11a to measure the amount of heat generated in the first internal heater 11a. The calorific value of the coal by type is calculated as the amount of heat input until the temperature of the central part where the thermocouple 18 is located reaches 950 ° C.

According to the method for producing coke of the present invention, the influence of coal composition and operating factors on the calorific value of the coal can be evaluated to determine the required calorific value when coal composition and operating factors are changed. As described above, the dry calorific value of the coal used for the blending is firstly measured, and the calorific value of each coal obtained is weighted averaged according to the blending ratio to calculate the calorific calories required for the blend charcoal, And calcu- lated the calorific value of each operation and combination.

According to the coke producing method of the present invention, a calorific value calorific value database for each seed type can be constructed, and the influence of each operation factor can be quantified to calculate the calorific value of the calorific value.

Various effects can be expected through the formula for calculating the calorific value of the coke produced by the coke production method described above. As a result, the effect of accurately calculating and inputting the calories required for changing the composition can be expected. Further, it is possible to calculate the required calorie value when the operation rate is changed, the time for changing the time for the operation of the apparatus, or the target temperature is changed. The charging density due to the change in particle size of the blend varies with each door, so that it can be applied to the operation in real time by applying the average value. In addition, it is possible to reflect the moisture change of the blend, which may be changed every moment, to the operation in real time.

As a result, it can be applied in real time in accordance with the formulation and operating parameters. Therefore, it is possible to expect a remarkable effect that can prevent the coke quality deterioration due to the unconstrained or the cost increase due to the overcurrent.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

10: Measuring device
11a: first internal heater
11b: second internal heater
12: Reaction tube
18: Thermocouple

Claims (5)

Calculating a first calorific heat quantity for the compounding coal from the database of the coal dry calorific value for each coal type;
Calculating a second amount of calorific heat that reflects the influence of the factor of the drying process on the first amount of the first amount of heat; And
Introducing the second amount of calorific value into a coke oven charged with coal to produce coke;
≪ / RTI > The method according to claim 1,
Wherein the first dry heat amount is a value obtained by weighted averaging the dry heat amount of each coal according to the blend ratio of the blast coal, and the dry process operating factor includes moisture, charging density and furnace. The method according to claim 1,
Wherein the database of the carburizing calories by burning type includes a carburizing heat quantity measured at a loading condition of 0.9% to 1.1% water, a loading density of 750 kg / m 3 , and a temperature of 1000 ° C, (1). ≪ / RTI >
(Equation 1)
(Kg-coal) -1 (%) -1 x (water content - 1%) - 0.12 Kcal (kg-coal) ) -1占 (750 kg / m 3 ) -1占 (charging density-750 kg / m 3 ) + 1.1 占 kg-coal -1占 (占 폚 -1 )
(Kcal (kg-coal) -1 , water content:%, loading density: kg / m 3 , The method according to claim 1,
Wherein the steps can be carried out in real time according to the compounding ratio of the compounding coal or the change in the operating factor of the dry process. The method according to claim 1,
Wherein the first internal heater and the second internal heater arranged in parallel to the periphery of the reaction tube charged with the compounded carbon are maintained at the same temperature, Calculating a calorific value by measuring the amount of heat generated in the first internal heater in a state in which the heat generated in the first internal heater is transferred to the reaction tube and used only for the flowing of the compounded carbon, Method of manufacturing coke.
KR1020150086976A 2015-06-18 2015-06-18 Method of manufacturing coke KR20160149648A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190075739A (en) * 2017-12-21 2019-07-01 주식회사 포스코 Device for evaluating quantity of coal carbonization heat
CN110186744A (en) * 2019-04-12 2019-08-30 武汉钢铁有限公司 A kind of sintering solid fuel calorific capacity on-line quick detection method and processing unit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190075739A (en) * 2017-12-21 2019-07-01 주식회사 포스코 Device for evaluating quantity of coal carbonization heat
CN110186744A (en) * 2019-04-12 2019-08-30 武汉钢铁有限公司 A kind of sintering solid fuel calorific capacity on-line quick detection method and processing unit
CN110186744B (en) * 2019-04-12 2020-09-15 武汉钢铁有限公司 Sintered solid fuel calorific value online rapid detection method and processing device

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