KR970001185B1 - Process for mixing powdered coke with mixed material for production of coke - Google Patents

Process for mixing powdered coke with mixed material for production of coke Download PDF

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KR970001185B1
KR970001185B1 KR1019930030256A KR930030256A KR970001185B1 KR 970001185 B1 KR970001185 B1 KR 970001185B1 KR 1019930030256 A KR1019930030256 A KR 1019930030256A KR 930030256 A KR930030256 A KR 930030256A KR 970001185 B1 KR970001185 B1 KR 970001185B1
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coke
coal
blended
powdered
range
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KR950018397A (en
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이성수
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조말수
포항종합제철주식회사
백덕현
재단법인산업과학기술연구소
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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
    • C10B57/04—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition
    • C10B57/045—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition containing mineral oils, bitumen, tar or the like or mixtures thereof
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L9/00—Treating solid fuels to improve their combustion
    • C10L9/10—Treating solid fuels to improve their combustion by using additives

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

Abstract

In the process for mixing a raw material for manufacturing a furnace coke, below 5 wt. % of coke powder is mixed with coal, based on the total wt. of final product, on condition that flow rate of final product increases 0.014-0.03 log ddpm when 1 wt.% of powdered coke is mixed with coal. Total dilatation(TD) of final product is 100-120%, its composition balance index is 0.89-1.2, its flow rate is 2.4 log ddpm. The powder coke which is produced from an iron manufacturing process as a byproduct is reused as a part of law material in manufacturing a furnace coke by using this process in which below 5 wt.% of power coke is mixed based on the total wt. of law material.

Description

코코스 제조용 배합원료에의 분코크스 배합방법How to mix powdered coke into blended raw materials for cocos production

본 발명은 야금용 코크스 제조시 코크스 제조용 배합원료에 분코크스를 배합하는 방법에 관한 것이다.The present invention relates to a method of blending powdered coke with a compounding material for producing coke during the manufacture of metallurgical coke.

제철소의 고로에 사용되는 야금용 코크스의 제조시에는 통상 ASTM 분류에서 고휘발분 역청탄, 중휘발분 역청탄, 저휘발분 역청탄으로 분류되는 석탄, 즉 역청탄중 일부의 탄종만 코크스 제조용으로 사용될 수 있다.In the manufacture of metallurgical coke for use in blast furnaces in steelworks, only coal species of coal, ie, bituminous coal, classified in the ASTM classification as high volatile bituminous coal, heavy volatile bituminous coal, and low volatile bituminous coal can be used for the production of coke.

그리고, 이들 석탄은 코크스 오븐(ocke oven)에 장입되는 코크스용 원료로 배합될 때 고휘발분 역청탄이 20-25%, 중휘발분 역청탄이 50-55%, 저휘발분 역청탄이 20-25% 수준으로 배합되어 혼합된 후 코크스 오븐에 장입되며, 코크스 오븐에서 1300℃의 건류온도로 16-17시간 건류하면, 코크스가 60-70%, 타르가 3.5-5.5%, 코크스 오븐개스가 17-25%, 벤젠, 톨루엔, 크실렌등의 기타성분이 1-2%인 건류생성물이 제조된다.When the coal is blended as a raw material for coke charged in a coke oven, the high volatility bituminous coal is 20-25%, the heavy volcanic bituminous coal is 50-55% and the low volatility bituminous coal is 20-25%. After mixing, the mixture is charged into a coke oven, and when it is dried for 16-17 hours at a coking oven at a drying temperature of 1300 ° C., the coke is 60-70%, the tar is 3.5-5.5%, the coke oven gas is 17-25%, and benzene A dry product having 1-2% of other components, such as toluene and xylene, is prepared.

이와 같이 제조된 코크스는 야금용 코스트로 사용되기 위해서 고로내에서 충분한 강도를 유지해야 되기 때문에 JIS 2151에 의해 시험규격으로 하기 표 1과 같은 기준을 만족해야 한다.Since the coke manufactured as described above has to maintain sufficient strength in the blast furnace in order to be used as a metallurgical cost, it is required to satisfy the criteria shown in Table 1 as a test standard according to JIS 2151.

야금용으로 생산되는 60-70%의 코크스 가운데, 약 10%는 입도가 20mm 이하인 분코크스로서 고로에 사용되지 못하고 소결 원료등으로 활용되고 있으나, 입도가 3mm 보다 더 미세한 경우 소결 원료로의 활용도 어려워 야드(yard)에 야적함으로써 제철소 분진공해의 요인이 되고 있다.Of the 60-70% coke produced for metallurgy, about 10% of the coke has a particle size of 20mm or less, which is not used in blast furnaces and is used as a sintering raw material.However, when the particle size is finer than 3mm, it is difficult to use as a sintering raw material. It is becoming a factor of steel mill dust pollution by the yard.

본 발명자는 제철소 부산물로 부생되는 분코크스의 활용에 대하여 연구 및 실험을 행하고, 그 결과에 근거하여 본 발명을 제한하게 된 것으로서, 본 발명은 코크스 제조용 배합원료의 성상중 전팽창(total dilatation), 및 조직평형지수(composition balanc eindex)를 일정범위로 유지시킨 상태에서 유동도에 기초하여 폐자원인 분코크스를 배합원료에 적정량 첨가하고, 얻어진 최종 배합탄을 코크스 제조용 배합원료로 활용할 수 있는 배합방법을 제공하고자 하는데, 그 목적이 있다.The present inventors have conducted research and experiments on the use of by-products of coke produced as a by-product of steelworks, and based on the results, the present invention is limited, and the present invention is a total dilatation in the properties of the coke-making compound. And a method of adding the final amount of buncoke, which is a waste resource, to the blending raw materials based on the fluidity while maintaining the composition balanc eindex within a certain range, and using the obtained final blended coal as a blending raw material for coke production. It is intended to provide a purpose.

이하, 본 발명을 설명한다.Hereinafter, the present invention will be described.

본 발명은 야금용 코크스 제조용 원료를 배합하는 방법에 있어서, 상기 배합원료로 분코크스와 1종 또는 2종 이상의 석탄을 사용하고; 상기 분코크스의 첨가량은 상기 분코크스와 석탄으로 이루어지는 최종 배합탄의 중량에 대하여 5% 이하의 범위로 하며; 최종 배합탄의 전팽창율이 100-120%의 범위, 조직평형지수가 0.89-1.2의 범위, 그리고 유동도는 2.4log ddpm를 기준으로 하여 분코크스 1중량% 첨가시 0.0014-0.03log ddpm의 범위 내로 증가되도록 분코크스와 석탄을 첨가하는 코크스 제조용 배합원료에의 분코크스 배합방법에 관한 것이다.The present invention relates to a method of blending a raw material for producing metallurgical coke, wherein the blended raw material uses powdered coke and one or two or more coals; The amount of added coke is in the range of 5% or less with respect to the weight of the final blended coal consisting of the coke and coal; The total expansion rate of the final blended coal is in the range of 100-120%, the tissue equilibrium index is in the range of 0.89-1.2, and the flow rate is within the range of 0.0014-0.03log ddpm when 1 wt% of coke is added based on 2.4 log ddpm. The present invention relates to a method for blending powdered coke in a blended raw material for producing coke, wherein powdered coke and coal are added to increase.

이하, 본 발명에 대하여 상세히 설명한다.EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

일반적으로 석탄을 구성하는 성분은 크게 점결성분과 섬유질 성분으로 구분되며, 이 점결성분과 섬유질 성분의 구성비가 적절할 때 강한 점결력을 나타낸다.In general, the components constituting coal are largely classified into caking components and fibrous components, and when the composition ratio of these caking components and fibrous components is appropriate, they exhibit strong caking strength.

석탄을 코크스 오븐에서 공기와 차단하고 건류하여 코크스를 제조하는 코크스 제조공정에서는 상기한 고휘발분 역청탄, 중휘발분 역청탄 및 저휘발분 역청탄의 점결탄이 가지고 있는 점결력을 이용하여 괴코크스를 제조한다. 결국, 점결력이 약하거나, 점결력이 없는 석탄은 석탄의 건류 과정에서 석탄입자들이 강하게 결합되지 못하므로 야금용으로 사용될 수 있는 괴코크스가 생성되지 않는다.In the coke manufacturing process of manufacturing coke by blocking coal from air in a coke oven and distilling the coke, the coke is manufactured using the coking force of the coking coal of the above-described high volatile bituminous coal, heavy volatile bituminous coal and low volatile bituminous coal. As a result, coal having weak coking force or non-coking force does not produce coal coke that can be used for metallurgy because coal particles are not strongly bound in the coal drying process.

따라서, 여러 가지 성상을 갖는 석탄에 분코크스를 혼합하여 코크스 배합원료를 제조하는 경우 본 발명에서는 석탄과 분코크스로 이루어지는 최종 배합탄의 전팽창(totaldilatation; TD)을 100-120% 정도에서 유지하도록 한다. 석탄은 약 3 C/분 정도로 승온하여 일정온도(500-600 C)를 유지하면 팽창을 하는데, 이때 전팽창은 plastome ter로 측정되는 석탄마다 갖는 고유값으로서 성상이 다른 석탄의 배합비로 조절 가능하다.Therefore, in the case of preparing coke blended raw material by mixing the powdered coke with coal having various properties, in the present invention, the total expansion of the final blended coal consisting of coal and the powdered coke is maintained at about 100-120%. do. Coal is about 3 Temperature rises to about C / min (500-600 If C) is maintained, the expansion is performed, and the total expansion is an intrinsic value for each coal measured by the plastome ter and can be adjusted by the mixing ratio of coals having different properties.

이와 더불어 본 발명에 따른 최종 배합탄은 석탄의 불활성(inert) 성분과 활성(reactive) 성분에 기초하여 구해지는 조직평형지수(composition balane index; CBI)가 0.89-1.2의 범위를 유지하도록 한다. 최종 배합탄의 조직평형지수 역시 석탄의 배합비를 조절이 가능하다.In addition, the final blended coal according to the present invention allows a composition balane index (CBI) obtained based on the inert and reactive components of coal to maintain a range of 0.89-1.2. The structural equilibrium index of the final coal coal can also control the coal mixing ratio.

또한, 본 발명에 따른 최종 배합탄은 그 유동도의 제어가 가장 중요한데, 최종배합탄의 유동도는 적어도 2.4log ddpm(dial digit per minute의 log 값)을 갖도록 배합하고, 이 값을 기준으로 분코크스 1% 배합(최종 배합탄에 대한 중량비)시 그 유동도가 0.014-0.03log ddpm 만큼 증가되도록 함이 바람직하다. 구체적으로 분코크스를 최종 배합탄에 1중량% 첨가시 그 최종 배합탄의 유동도는 2.414-2.43log ddpm 의 범위에서 유지되도록 석탄을 배합한다.In addition, the final mixed coal according to the present invention is the control of the flow rate is the most important, the final mixed coal flow rate is blended to have at least 2.4 log ddpm (log value of dial digit per minute), based on this value It is desirable to allow the flow to increase by 0.014-0.03 log ddpm when coke 1% blended (weight ratio to final coal blend). Specifically, when 1% by weight of coke is added to the final coal blended coal, the coal is blended so that the flow rate of the final coal blend is maintained in the range of 2.414-2.43 log ddpm.

그리고, 본 발명에서 이용되는 분코크스는 그 첨가량을 최종 배합탄의 중량에 대하여 5% 이하로 제한하는데, 그 이유는 분코크스의 양이 5중량% 이상이 되면 최종 배합탄에 의해 제조되는 코크스의 강도가 상기한 JIS 2151에 의한 규격을 만족하지 않기 때문이다.In addition, the powdered coke used in the present invention limits the added amount to 5% or less with respect to the weight of the final blended coal, because the amount of the coke produced by the final blended coal is 5% by weight or more. This is because the strength does not satisfy the above standard according to JIS 2151.

즉, 발명에서는 배합원료의 유동도를 적절히 제어하여 점결성분과 섬유질성분의 구성비를 적절하게 하므로써, 점결성이 전혀없는 분코크스를 5%까지 배합하더라도 종래방법과 동등 또는 그 이상의 품질을 갖는 야금용 코크스를 제조할 수 있다.That is, in the present invention, by controlling the flow rate of the blended raw material appropriately to make the composition ratio of the caking component and the fibrous component, even if blended up to 5% powdered coke with no cohesion at all 5% of the metallurgical coke having the same or better quality than the conventional method It can manufacture.

이하, 실시예를 통하여 본 발명을 보다 구체적으로 설명한다.Hereinafter, the present invention will be described in more detail with reference to Examples.

실시예Example

하기 표 3의 성상을 갖는 A 및 B에 하기표 4와 같은 배합비 및 배합성상 조건하에서 분코크스를 제조한 다음, 코크스의 품질을 측정하고, 그 결과를 하기 표 4에 나타내었다.To the A and B having the properties shown in Table 3 below, powdered coke was prepared under the same mixing ratio and blending phase conditions as in Table 4, and then the quality of the coke was measured, and the results are shown in Table 4 below.

상기 표 4에 나타난 바와 같이, 비교예(1)은 종래방법으로서, 실제 코크스 제조를사용되는 배합탄인 석탄 B를 100%로 한 것이며, 비교예(2)는 단순히 석탄 B에 분코크스를 5%만을 배합시킨 것으로서, 비교예(2)는 종래방법인 비교예(1) 보다 코크스 품질이 저하됨을 알 수 있다.As shown in Table 4, Comparative Example (1) is a conventional method, the coal B, which is a coal blend used in the actual coke production to 100%, Comparative Example (2) is simply a coal B to powder coke 5 By blending only%, it can be seen that Comparative Example (2) is lower in coke quality than Comparative Example (1), which is a conventional method.

한편, 발명예(1∼3) 및 비교예(3∼4)는 분코크스를 3%, 5%, 10%로 증가 배합하고 분코크스가 배합된 만큼 석탄 A를 배합하여 배합탄의 유동도를 증가시킨 것으로서 분코크스 배합비가 5%이하인 발명예(1∼3)의 경우에는 비교예(1)의 경우에 비교하여 냉간강도와 반응후 강도가 동등이상의 수준임을 알 수 있다.On the other hand, the invention examples (1 to 3) and the comparative examples (3 to 4) increase the blended powdered coke to 3%, 5% and 10%, and blend coal A as much as the coked powder is blended to increase the flow rate of the coal briquettes. In the case of Inventive Examples (1 to 3) in which the powdered coke mixing ratio is 5% or less, it can be seen that the cold strength and the strength after the reaction are equal to or higher than those of Comparative Example (1).

그러나, 분코크스를 10%로 한 비교예(3) 및 (4)의 경우에는 석탄 A의 배합비를 조정하여 배합탄의 유동도를 증가하여도 코크스의 품질이 종래방법에 비하여 저하됨을 알 수 있다.However, in the case of Comparative Examples (3) and (4) in which the powdered coke was 10%, the quality of the coke was deteriorated compared to the conventional method even when the flow rate of the coal was increased by adjusting the mixing ratio of coal A. .

그리고, 발명예(2)의 경우에는 유동도 2.4log ddpm을 기준으로 분코크스 1% 배합증가에 배합탄의 유동도를 0.014log ddpm의 비율로, 발명예(1) 및 (3)의 경우에는 0.03log ddpm의 비율로 상승시킨 것으로서, 발명예(1∼3)의 경우에는 모든 종래방법인 비교예(1) 보다 높은 품질의 코크가 제조된 것임을 알 수 있다.In the case of the invention example (2), in the case of invention examples (1) and (3), in the case of invention example (1) and (3), the flow rate of the coal blend is 0.014 log ddpm with the increase of powdered coke 1% based on the flow rate 2.4log ddpm. As it increased by the ratio of 0.03 log ddpm, it can be seen that in the case of Inventive Examples (1 to 3), coke of higher quality was produced than Comparative Example (1), which is all conventional methods.

상술한 바와 같이, 본 발명은 제철부산물로 부생되는 분코크스를 5%까지 원료탄의 일부로 야금용 코크스 제조에 재활용할 수 있으므로 종래 야드에 장기간 방치함으로 인해 발생되는 분진공해의 방지는 물론 코크스 제조원가를 절감시킬 수 있는 효과가 있는 것이다.As described above, the present invention can be recycled in the manufacture of metallurgical coke as part of the raw coal as up to 5% of the coke by-product as steel by-products to prevent dust pollution caused by long-term storage in conventional yards, as well as to reduce coke production cost There is an effect that can be made.

Claims (1)

야금용 코크스 제조용 원료를 배합하는 방법에 있어서, 상기 배합원료로 분코크스와 1종 또는 2종 이상의 석탄을 사용하고; 상기 분코크스의 첨가량은 상기 분코크스와 석탄으로 이루어지는 최종 배합탄의 중량에 대하여 5% 이하의 범위로 하며; 최종 배합탄의 전팽창율이 100-120%의 범위, 조직평형 지수가 0.89-1.2의 범위, 그리고 유동도는 2.4log ddpm를 기준으로 하여 분코크스 1중량% 첨가시 0.014-0.03log ddpm의 범위 내로 증가되도록 분코크스와 석탄을 첨가함을 특징으로 하는 코크스 제조용 배합원료에의 분코크스 배합방법.A method of blending a raw material for producing metallurgical coke, comprising: using powdered coke and one or two or more coals as the blending raw materials; The amount of added coke is in the range of 5% or less with respect to the weight of the final blended coal consisting of the coke and coal; The total expansion rate of the final blended coal is in the range of 100-120%, the tissue equilibrium index is in the range of 0.89-1.2, and the flow rate is in the range of 0.014-0.03log ddpm when 1 wt% of coke is added based on 2.4 log ddpm. A method of blending powdered coke in a blended raw material for producing coke, characterized by adding powdered coke and coal to increase.
KR1019930030256A 1993-12-28 1993-12-28 Process for mixing powdered coke with mixed material for production of coke KR970001185B1 (en)

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