US3907648A - Method of manufacturing formed coke for blast furnaces without causing the fusion of the coke - Google Patents

Method of manufacturing formed coke for blast furnaces without causing the fusion of the coke Download PDF

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Publication number
US3907648A
US3907648A US335868A US33586873A US3907648A US 3907648 A US3907648 A US 3907648A US 335868 A US335868 A US 335868A US 33586873 A US33586873 A US 33586873A US 3907648 A US3907648 A US 3907648A
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Prior art keywords
coke
coal
percent
formed coke
coking
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US335868A
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English (en)
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Naomichi Nire
Takeo Sakai
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Nippon Steel Corp
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Sumitomo Metal Industries Ltd
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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
    • 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
    • C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
    • C10B53/08—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form in the form of briquettes, lumps and the like

Definitions

  • FIG.4A is a diagrammatic representation of FIG.4A
  • formed coke is manufactured by carbonizing coal briquettes or cakes formed by pressure molding the blend coal which is composed of poor coking coal and non-coking coal as main materials and a small quantity of inert carbon material and coking coal as auxiliary materials and containing a proper amount of bituminous binder obtained from coal or petroleum.
  • This invention provides an improved method of manufacturing formed coke for blast furnaces without caus ing the fusion of the coke being carbonized. which is characterized in that the total dilatation of the blend material for the formed coke is made less than 27 percent. that the Trommel strength of the formed coke is made to be no less than 92 percent, and that the carbonization is done by using a coke oven where the carbonized formed coke can be discharged by its own weight.
  • Metallurgical coke. particularly blast furnace coke. is usually obtained by carbonizing a blended coal containing various hard coking coals in a conventional coke oven at a high temperature.
  • formed coke is produced by adjusting the material proportionssuch that the caking component contained in the total material beforebriquetting is within a range between 60 and 66 percent. According to this methodfho'wever, good formed coke having a constant shape for blast furnaces cannot be obtainedwith material solely consisting of imported coal or containing 70 percentor more of imported coal since the fusion of the individual coal briquettes or cakes at the time of carbonization is severe. According to the invention ofthe Japanese Patent Publication No.
  • the present invention has been intended in view of the actual facts that coking coal of good quality is insufficient and that earlier inventions relating to the method of manufacturing formed coke using poor or non-coking coal as main material have not been put to practice in industry due to economical reasons.
  • According to the invention there is provided a method of manufacturing high quality formed coke for blast furnaces economically and on the industrial scale by using poor coking coal and non-coking coal abundantly occurring in nature as main material.
  • the inventors of the present invention noted that except for the economical aspect the prior-art for formed coke manufacturing techniques have not been put to practice inindustry due to the following grounds;
  • the vertical coke oven has a coke discharging door at the bottom of a coking chamber. After the earbonization, the coke is discharged by its own weight when the discharging door is opened.
  • the inclined eoke oven has an inclined coking chamber inclined at an angle greater than the angle of repose ofthe carbonized product, and the carbonized product can be discharged out of the oven by its own weight when a discharging door pro vided in a lower portion of the coking chamber is opened. While coke ovens of these types are well known to be used for producing coke from ordinal coking coal as the main material. their use for carbonization of formed coke for blast furnaces as according to this invention is unprecedented.
  • An object of the invention. accordingly. is to obviate drawbacks inherent in the prior-art techniques by the provision of a method of inexpensively manufacturing formed coke for blast furnaces by using a coking oven where the carbonized formed. coke can be discharged by its own weight and withoutcausing the fusion of the formed coke.
  • FIG. 1 is a graph showing the relation between fusion ration of the formed coke and total dilatation of the coal material according to the invention
  • FIG. 2 is a graph showing the relation between fusion ratio of the formed coke and Trommel strength of the coal briquette;
  • FIG. 3A is a front view of a device for measuring the Trommel strength of the coal briquette used for the invention
  • FIG. 3B is a side view of-the device of FIG. 3A1
  • FlG..4A is a front view of a vertical coke oven
  • FIG. 4B is a side view of the ovenof FlG. 4A.
  • FIG. 5 is a side view of an inclined coke oven.
  • FIGS. 4 and 5 schematically show special eokc ovens used for this invention.
  • numeral 3 designates coking chamber, numeral 4 heating flue, numeral 5 charging hole. numeral 6 dishcarging door, and numeral 7 ascension pipe of coke oven gas.
  • numeral 8 designates coking chamber, numeral 9 charging hole, numeral 10 discharging door. The angle is greater than the angle of repose of the formed coke.
  • the total dilatation is a value determined by one of coal dilatation testing methods as specified in the German standard DIN-51739. If the material contains more than a certain quantity of strongly dilatable component. the coal briquette undergoes extraordinary dilatation during the carbonizing step. causing fusion of adjacent formed coke to one another, so that fused coke would result. To produce formed coke of a constant form with good yield. therefore. it is necessary to hold the dilatation ofthe mixture material below a predetermined level.
  • the Trommel strength represents the strength of bond between individual material coal particles constituting the coal briquctte. If it is low. the bond ofcoal material particles is weak. so that coal briquette of low strength would be formed.
  • the trommel strength of the coal briquctte is proportional to the HS drum strength l5-mm index of the formed coke. This relation will be apparentfrom FIG. 2.
  • a coke oven where the formed coke can be discharged by its own weight is used.
  • Table 1 shows various kinds and qualities of coal used for research in the invention.
  • Coking coal and soft coking coal listed in Table l are used for producing blast furnace coke with a presently conventional coke oven.
  • the drum strength l5-mm index for the formed coke is above 92 percent in any of the tests. Thus. any sample can be used well for blast furnaces.
  • the fusion factor of the formed coke is slightly high.
  • the normal briquette not fused has average dimensions 48 X 48 X 31 mm.
  • the drum strength lS-mm index of the formed coke underwent fusion is 91.9 percent in the average. which is slightly lower than the formed coke strength required, but even the fused coke may be used for smallscale blast furnaces. ln order to produce coke of a constant grain size with good yield, however. the fusion should be avoidedas much as possible by appropriately adjusting the proportions of the coal materials used coal briquette and the method of manufacturing coal briquette. Comparing the results in Table 3 and proportions of materials shown in Table 2. in the test No. l. 5 percent of soft coking coal with a total dilatation of 24.1 percent isj mixed. In the Test No. 2, the proportions of the coking coal and poor coking coal (A) are mixed 5 percent higher than those in the test No. 3. This difference in thematerial proportions is thought to have delicate effects upon the phenomenon of fusion of the formed coke.
  • EMBODIMENT 2 Table 4 shows results of testing for confirming the re lation between the fusion factor of the formed coke mentioned in the previous embodiment l and the total dilatation of the all mixed materials prior to the briquetting and testing for seeking the relationship between Trommel strength of the coal briquette and quality of formed coke.
  • the method of producing coal briquette and formed coke is cntirely the same as in the embodiment l.
  • the proportions are based on the method of adjusting the material proportionsas set forth in the Japanese Patent Publication No. 6678/1950, that is. the material are set such that the caking component contained in the total material prior tobriquetting is within a range between and 66 percent. In this case, the fusion of the formed coke reaches as high as about 34 percent. This means that with the material mainly consisting of imported coal due to the recent coal situation, the method of the Japanese Patent Publication does not permit the manufacture of formed coke of a constant form with'good yield.'
  • the coal briquette is produced under the same conditions as in the embodiment 1 except for a reduction by 3 percent of the pitch in the binder and an increase by 3 percent of the coking coa'l.
  • the binder content is reduced.
  • the Trommel strength of the coal briquette is reduced.
  • the fusion of the formed coke reached 21 percent.
  • the end of carbonization can be discharged by its own weight by' opening the discharging door. Since no discharging operation by a' pusher as is involved in the conventional coke oven is required; the vertical coke oven is-best suited to-the carbonization offormed coke. While it is known to use the coke oven of this type for the production of the conventional coke with material mainly composed of the coking coal. the use of this oven for the charbonization of formed coke for blast furnaces as accordingfttfthis invention is unprecedented.
  • the inventors of this invention produced about 10.000-tons of formed coke for blast furnaces in about three months with the same material proportions and formedcoal manufacturing conditions as in the test No. 3 mentioned above in the embodiment 1.
  • Table S shows the quality of formed coke for blast furnaces obtained in this period and the quality of the ordinal coke for blast furnaces.
  • the water absorption factor is the totalmoisture content (in percent by weight) obtained after submerging coke with grain size of 30 to 40 mm in water for 24 hours.
  • the quality of the formed coke for blast furnaces according to the invention is superior to the coke produced with the conventional coke oven in the drum strength and grain size.
  • the grain size of the formed coke for blast furnaces is substantially within a range between 50 and 25 mm. and the proportion of powdery coke (l mm) is less than compared with the conventional coke.
  • the water absorption factor of the formed coke is about one half that of the conventional coke. which is very useful in the reduction ofthe coke ratio in the blast furnace.
  • a method of manufacturing a blend ofcoal niaterir als for use in producing formed coke for blast furnaces from a blend of different materials without causing the fusion of the coke.
  • the blend being composed of 7() to percent by weight of poor coking and non-coking coal as the main material.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Coke Industry (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)
US335868A 1972-02-29 1973-02-26 Method of manufacturing formed coke for blast furnaces without causing the fusion of the coke Expired - Lifetime US3907648A (en)

Applications Claiming Priority (1)

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JP47021240A JPS5214241B2 (pt) 1972-02-29 1972-02-29

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US (1) US3907648A (pt)
JP (1) JPS5214241B2 (pt)
BR (1) BR7301520D0 (pt)
ES (1) ES412045A1 (pt)
FR (1) FR2174076B1 (pt)
GB (1) GB1392133A (pt)
IT (1) IT987887B (pt)
ZA (1) ZA731141B (pt)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4100031A (en) * 1976-04-30 1978-07-11 Sumikin Coke Company Limited Process for preparing blast furnace cokes
US4105501A (en) * 1975-10-23 1978-08-08 Nippon Kokan Kabushiki Kaisha Method for producing metallurgical coke
US4106996A (en) * 1974-09-14 1978-08-15 Werner Wenzel Method of improving the mechanical resistance of coke
US4110169A (en) * 1975-04-01 1978-08-29 Nippon Kokan Kabushiki Kaisha Method for manufacturing high-strength formed coke in slight mutual agglomeration using horizontal type coke oven battery
US4111755A (en) * 1975-10-30 1978-09-05 Mcdowell-Wellman Engineering Company Method of producing pelletized fixed sulfur fuel
US4197160A (en) * 1977-03-28 1980-04-08 Houilleres du Bassin du Nord et, Due Pas-de-Calais Process by means of which moulded coke can be obtained from non-cokable coals
US4272323A (en) * 1977-02-12 1981-06-09 Didier Engineering Gmbh Process for producing coke
US7611609B1 (en) * 2001-05-01 2009-11-03 ArcelorMittal Investigacion y Desarrollo, S. L. Method for producing blast furnace coke through coal compaction in a non-recovery or heat recovery type oven

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62194435U (pt) * 1986-05-31 1987-12-10
JP5017969B2 (ja) * 2006-08-31 2012-09-05 Ｊｆｅスチール株式会社 フェロコークス原料成型物およびフェロコークスの製造方法
JP5742650B2 (ja) * 2010-10-15 2015-07-01 新日鐵住金株式会社 成形コークスの製造方法及びその方法で製造された成形コークス

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1664632A (en) * 1928-04-03 X c coking retost oven
US2200371A (en) * 1937-09-15 1940-05-14 Koppers Co Inc Continuously operated vertical chamber or retort ovens for the production of gas and coke
US3546076A (en) * 1965-04-21 1970-12-08 Great Lakes Carbon Corp Method of producing metallurgical coke
US3619376A (en) * 1967-04-12 1971-11-09 Great Lakes Carbon Corp Method of making metallurgical coke briquettes from coal, raw petroleum coke, inert material and a binder

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1664632A (en) * 1928-04-03 X c coking retost oven
US2200371A (en) * 1937-09-15 1940-05-14 Koppers Co Inc Continuously operated vertical chamber or retort ovens for the production of gas and coke
US3546076A (en) * 1965-04-21 1970-12-08 Great Lakes Carbon Corp Method of producing metallurgical coke
US3619376A (en) * 1967-04-12 1971-11-09 Great Lakes Carbon Corp Method of making metallurgical coke briquettes from coal, raw petroleum coke, inert material and a binder

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4106996A (en) * 1974-09-14 1978-08-15 Werner Wenzel Method of improving the mechanical resistance of coke
US4110169A (en) * 1975-04-01 1978-08-29 Nippon Kokan Kabushiki Kaisha Method for manufacturing high-strength formed coke in slight mutual agglomeration using horizontal type coke oven battery
US4105501A (en) * 1975-10-23 1978-08-08 Nippon Kokan Kabushiki Kaisha Method for producing metallurgical coke
US4111755A (en) * 1975-10-30 1978-09-05 Mcdowell-Wellman Engineering Company Method of producing pelletized fixed sulfur fuel
US4100031A (en) * 1976-04-30 1978-07-11 Sumikin Coke Company Limited Process for preparing blast furnace cokes
US4272323A (en) * 1977-02-12 1981-06-09 Didier Engineering Gmbh Process for producing coke
US4197160A (en) * 1977-03-28 1980-04-08 Houilleres du Bassin du Nord et, Due Pas-de-Calais Process by means of which moulded coke can be obtained from non-cokable coals
US7611609B1 (en) * 2001-05-01 2009-11-03 ArcelorMittal Investigacion y Desarrollo, S. L. Method for producing blast furnace coke through coal compaction in a non-recovery or heat recovery type oven

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Publication number Publication date
ES412045A1 (es) 1976-01-01
BR7301520D0 (pt) 1974-07-18
GB1392133A (en) 1975-04-30
IT987887B (it) 1975-03-20
FR2174076A1 (pt) 1973-10-12
JPS4889901A (pt) 1973-11-24
ZA731141B (en) 1973-11-28
FR2174076B1 (pt) 1976-04-23
JPS5214241B2 (pt) 1977-04-20

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