US3857694A - Process for burning hydrocarbons and cracked products in exhaust gases from sintering machines - Google Patents

Process for burning hydrocarbons and cracked products in exhaust gases from sintering machines Download PDF

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Publication number
US3857694A
US3857694A US00306491A US30649172A US3857694A US 3857694 A US3857694 A US 3857694A US 00306491 A US00306491 A US 00306491A US 30649172 A US30649172 A US 30649172A US 3857694 A US3857694 A US 3857694A
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United States
Prior art keywords
hydrocarbons
exhaust gases
sintering
cracked products
wind boxes
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Expired - Lifetime
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US00306491A
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English (en)
Inventor
F Cappel
J Otto
S Nikl
H Rausch
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GEA Group AG
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Metallgesellschaft AG
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/16—Sintering; Agglomerating
    • C22B1/20—Sintering; Agglomerating in sintering machines with movable grates

Definitions

  • FIGS. 1 through 4 are diagrammatic views in side elevation illustrating several embodiments of the process of the invention.
  • the exhaust gases are preferably conducted through a cooling zone which is provided on the sintering machine and begins at the point where the ignition zone in the sinterable mixture just reaches the grateprotecting layer.
  • the cooling may be performed using suction or pressure.
  • the entire exhaust gas may be passed through the cooling zone if the mixed temperature of all exhaust gases from the sintering machine is below about 80C.
  • the exhaust gases which contain hydrocarbons and/or cracked products are withdrawn from-those wind boxes which when viewed in the direction of travel in the sintering machine precede a point which closely follows the point where the expulsion of the hydrocarbons and- /or cracked products has been terminated.
  • a cooler exhaust gas which contains hydrocarbons and- /or cracked products is formed at a lower volumetric rate. The point where the expulsion is terminated is generally close to the point where the water has been expelled from the sinterable mixture and the temperature of the exhaust gases rises more rapidly.
  • the exhaust gases which contain hydrocarbons and/or cracked products are withdrawn from the wind boxes disposed under that portion ofthe sintering machine in which a major portion ofthe hydrocarbons and/or cracked products are expelled.
  • the volumetric rate of the exhaust gas to be supplied to the cooling zone may be reduced and an effective removal of the hydrocarbons and/or cracked products may nevertheless be obtained.
  • the exhaust gases withdrawn from the wind boxes which contain hydrocarbons and/or crackedproducts are introduced into the portion of the cooling zone forward of the sintering zone.
  • cold air may be passed through the sintered mixture. This practice results in a good combustion of the hydrocarbons and cracked products and also in a good cooling along a short path.
  • exhaust gases from the wind boxes disposed under that portion of the sintering machine which receives the sinterable mixture when the expulsion of water therefrom has been terminated are recycled into the ignition box. Because hot exhaust gases are used in theignition box, less fuel is required for the ignition so that hydrocarbons and cracked products are produced at a lower rate.
  • FIGS. 1 through 4 show several embodiments of sintering machines 1 having an upper course which moves in the direction of the arrow 2.
  • the sintering mixture is ignited in the ignition box 3.
  • Wind boxes 4, 4a, 4b, 4c, 4d are disposed under that portion of the sintering machine in which sintering is effected.
  • the wind boxes are diagrammatically indicated as respective individual wind boxes but may consist of a plurality of individual wind boxes, which are connected to a gas-collecting manifold.
  • the gas-collecting manifolds for the wind boxes are designated 5, 5a, 5b, 5c, 5d.
  • the sintering air is sucked by blowers (not shown) through the sinterable mixture into the wind boxes.
  • Wind boxes 6a and 6b are disposed under that portion of the sintering machine which is operated as a cooler.
  • a gas-collecting hood is disposed over the forward portion of the cooling zone. Through conduit 8, the gases are conducted from the hood 7 to the dust collector, not shown. Cool ing air is forced into the rear portion of the cooling zone through conduit 9.
  • the following examples relate to a sintering machine having a sintering area of I00 square meters and a cooling area of square meters.
  • the core mixture which is processed has the following composition:
  • Limestone l2% including hydrocarbons 100 parts of the mixture are sintered together with 50% returns, 7 parts fuel, and 6.5 parts water. Sinter is produced at a rate of 146 metric tons per hour, as well as exhaust gas at a rate of 272,400 standard cubic meters per hour. The exhaust gas contains 20% of the hydrocarbons which had been fed in. (Herinafter, the term hydrocarbons will cover both hydrocarbons and cracked products.)
  • the exhaust gases from the entire sintering portion were withdrawn from wind boxes 4 through conduit and had a mixed temperature of about 80C.
  • the exhaust gas rate is 272,400 standard cubic meters per hour.
  • the exhaust gas contains 142 milligrams hydrocarbons per standard cubic meter.
  • the entire exhaust gas is conducted into the wind boxes 4-and 6a which are disposed under the first 62% of the length of the cooling area. From the wind boxes 6a, the gas flows through the hot sintered material into the gascollecting hood 7 and is withdrawn through conduit 8. Cooling air is forced through conduit 9 into wind boxes 6b, which are disposed under the remaining 38% of the length of the cooling area.
  • the mixed temperature of all exhaust gases from the sintering portion is about 160C.
  • Wind boxes 4d are disposed under the first 75% of the length of the sintering area. Wind boxes 40 are disposed under the remaining 25%. Viewed in the direction of travel of the sintering machine 1, the wind boxes 4d may terminate closely behind that point at which the expulsion of the hydrocarbons has been terminated. Exhaust gases at a rate of 190,000 standard cubic meters per hour are withdrawn from the wind boxes 4d through conduit 5d and introduced into the wind boxes 6a. These exhaust gases contain 203 milligrams hydrocarbons per standard cubic meter. The wind boxes 6a are disposed under the first 43% of the length of the cooling area. Cooling air is forced through conduit 9 into the wind boxes 61;, which are disposed under the remaining 57% of the length of the cooling area.
  • exhaust gases at a rate of 82,400 standard cubic meters per hour and at a temperature of about 300C, are withdrawn from the wind boxes4c, which are disposed under the remaining 25% of the length of the sintering area. These exhaust gases are virtually free of hydrocarbons and are conducted to the dust collector.
  • the mixed temperature of all exhaust gases from the sintering portion is about 160C.
  • the wind boxes 4b are disposed under the intermediate 50% of the length of the sintering area, the wind boxes 4a under the first 25% and the wind boxes 4c under the last 25%.
  • Exhaust gases at a rate of 126,500 standard cubic-meters per hour and at a temperature of 60C. are withdrawn from the wind boxes 4b through conduit 5b and fed into the wind boxes 6a. These exhaust gases contain 274 standard cubic meters per hour. This includes about 90% of the hydrocarbon content of all exhaust gases.
  • the wind boxes 6a are disposed under the first 29% of the length of the cooling area. Cooling air is forced through conduit 9 into the wind boxes 6b disposed under the remaining 71% of the length of the cooling area.
  • Example 2 The process conditions are the same as in Example 2 but the exhaust gases withdrawn from wind boxes 4c in conduit Sc are fed into the ignition box 3 so that less fuel is added and the exhaust gases withdrawn from the wind boxes 4d contain only 195 milligrams hydrocarbons per standard cubic meter.
  • the exhaust gas withdrawn in conduit 8 from the gas-collecting hood 7 contains virtually no hydrocarbons or only a few milligrams thereof.
  • step (i) thereafter passing the exhaust gases withdrawn in step (i) directly through the hot sintered material in a first portion of the cooling zone which follows the sintering, the hydrocarbons and/or cracked products in said exhaust gas being burned in the hot sintered material.
  • step (i) Process of claim 1 wherein the exhaust gases are withdrawn in step (i) by two successive groups of wind boxes, about 10 percent of the amount of the hydrocarbons and/or cracked products expelled from the mixture being sintered being withdrawn via the first group of wind boxes and the balance of about percent being withdrawn via the second group of wind boxes, the exhaust gases withdrawn via the second group of wind boxes being passed through the hot sintered material and burned as in 'step (ii).

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Tunnel Furnaces (AREA)
US00306491A 1971-11-17 1972-11-14 Process for burning hydrocarbons and cracked products in exhaust gases from sintering machines Expired - Lifetime US3857694A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2157044A DE2157044C2 (de) 1971-11-17 1971-11-17 Verfahren zur Verbrennung von Kohlenwasserstoffen und Spaltprodukten in Sinterabgasen

Publications (1)

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US3857694A true US3857694A (en) 1974-12-31

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US00306491A Expired - Lifetime US3857694A (en) 1971-11-17 1972-11-14 Process for burning hydrocarbons and cracked products in exhaust gases from sintering machines

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Country Link
US (1) US3857694A (fr)
AU (1) AU472608B2 (fr)
BE (1) BE791496A (fr)
CA (1) CA972575A (fr)
DE (1) DE2157044C2 (fr)
ES (1) ES407361A1 (fr)
FR (1) FR2161560A5 (fr)
GB (1) GB1409892A (fr)
IT (1) IT970899B (fr)
LU (1) LU66478A1 (fr)
NL (1) NL7214651A (fr)
ZA (1) ZA726227B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3973762A (en) * 1974-05-17 1976-08-10 Dravo Corporation Sintering process and apparatus
EP0446779A2 (fr) * 1990-03-10 1991-09-18 Preussag Stahl Aktiengesellschaft Procédé et installation de traitement d'écailles de lamination contenant de l'huile et matériaux similaires

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB498837A (en) * 1937-07-14 1939-01-16 Nikolai Ahlmann Improvements in the burning of cement or the sintering of similar raw materials
US3264091A (en) * 1963-06-20 1966-08-02 Mcdowell Wellman Eng Co Process for producing highly metallized pellets
US3311465A (en) * 1964-02-06 1967-03-28 Mcdowell Wellman Eng Co Iron-containing flux material for steel making process
GB1118030A (en) * 1967-02-23 1968-06-26 Mcdowell Wellman Eng Co Metallized pellets
US3649244A (en) * 1969-02-18 1972-03-14 Broken Hill Ass Smelter Method of sintering of mineral sulphides

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB498837A (en) * 1937-07-14 1939-01-16 Nikolai Ahlmann Improvements in the burning of cement or the sintering of similar raw materials
US3264091A (en) * 1963-06-20 1966-08-02 Mcdowell Wellman Eng Co Process for producing highly metallized pellets
US3311465A (en) * 1964-02-06 1967-03-28 Mcdowell Wellman Eng Co Iron-containing flux material for steel making process
GB1118030A (en) * 1967-02-23 1968-06-26 Mcdowell Wellman Eng Co Metallized pellets
US3649244A (en) * 1969-02-18 1972-03-14 Broken Hill Ass Smelter Method of sintering of mineral sulphides

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3973762A (en) * 1974-05-17 1976-08-10 Dravo Corporation Sintering process and apparatus
US4067727A (en) * 1974-05-17 1978-01-10 Dravo Corporation Sintering process
EP0446779A2 (fr) * 1990-03-10 1991-09-18 Preussag Stahl Aktiengesellschaft Procédé et installation de traitement d'écailles de lamination contenant de l'huile et matériaux similaires
EP0446779A3 (fr) * 1990-03-10 1991-10-16 Preussag Stahl Aktiengesellschaft Procédé et installation de traitement d'écailles de lamination contenant de l'huile et matériaux similaires

Also Published As

Publication number Publication date
CA972575A (en) 1975-08-12
DE2157044C2 (de) 1982-08-12
IT970899B (it) 1974-04-20
BE791496A (fr) 1973-03-16
LU66478A1 (fr) 1973-02-01
ZA726227B (en) 1973-05-30
GB1409892A (en) 1975-10-15
DE2157044A1 (de) 1973-05-24
NL7214651A (fr) 1973-05-21
AU4676672A (en) 1974-03-28
AU472608B2 (en) 1976-05-27
ES407361A1 (es) 1975-09-16
FR2161560A5 (fr) 1973-07-06

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