CN1876852A - Gasification cooling flue for steel-making converter - Google Patents
Gasification cooling flue for steel-making converter Download PDFInfo
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- CN1876852A CN1876852A CN 200610088268 CN200610088268A CN1876852A CN 1876852 A CN1876852 A CN 1876852A CN 200610088268 CN200610088268 CN 200610088268 CN 200610088268 A CN200610088268 A CN 200610088268A CN 1876852 A CN1876852 A CN 1876852A
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- flue
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Abstract
The invention relates to an evaporated cooling flue, which consists of movable hood for fume(14), glory-hole fixed field flue (15), intermediate field flue(17) and final guidance flue(18), and the movable hood for fume (14) is placed above the converter, the movable hood for fume (14), glory-hole fixed field flue(15), intermediate field flue (17) and final guidance flue (18) are sequentially connected, and is characterized in that: in the circulation water loop between the upper bubble (23) and the lower collector (24) of the movable hood for fume(14) and the glory-hole fixed field flue(15) a circulating pump (26) is supplemented, between the glory-hole fixed field flue(15) and the intermediate field flue (17) the expansion knot(28)is adopted for interconnection, a narrow straight run inclined bent-tube interconnecting structure (30) is adopted at the junction location of the intermediate field flue (17) and the final guidance flue(18), and the nichrome coating (31) is covered on the inner surface of the movable hood for fume (14) and the glory-hole fixed field flue (15). The invention can make the inside water in the pipe keep adequate all the time, can flex in flue length direction, and can effectively solve the aerated water layer-build problem in flue flat field and the slag-sticking problem of the flue inner surface and the gas scouring problem.
Description
Technical field:
The present invention relates to a kind of gasification cooling flue for steel-making converter.Belong to oxygen top blown converter steel making equipment
Technical field.
Background technology:
Linz-Donawitz process is nearest more than 50 years a kind of steel-smelting technologies that produce and grow up.It does not need outer heat supplied, is the carbon that utilizes in the molten iron self, closes with the technical pure oxidation, produces heat, for the needs of steel-making.Oxygen from the converter mouth top, is deep into the top suitable position of molten iron in the converter by the oxygen rifle, blows.In converting process, the oxide compound of iron and the carbide in the molten iron produce a large amount of carbon monoxide, emit a large amount of heats simultaneously.The gas of ejection is called furnace gas, and major ingredient is carbon monoxide (86～90%) and carbonic acid gas (about 10%).The temperature of furnace gas in stove is at 1400 ℃～1600 ℃.
Owing in steelmaking process, produce a large amount of coal gas of converter (carbon monoxide), generally all adopt gasification cooling flue and dust removal installation to produce steam and recovery coal gas, its technical process such as Fig. 1, converter gas borrows blower fan suction to enter gasification cooling flue, the recovery part fume afterheat, the flue gas that comes out from gasification cooling flue enters overflow Venturi meter dedusting cooling from top, the path transfer Venturi meter that enters the bottom after the elbow separator dehydration carries out smart dedusting, gas after dedusting is dewatered by elbow separator, purified gas, enters gas storage holder and stores by three-way switch valve by blower fan pressurization back.In total system, main device is made up of converter, gasification cooling flue and dust removal installation.Gasification cooling flue is a converter top cooling down high-temperature flue gas to 800 ℃～1000 ℃, produces steam, reaches the purpose of waste heat recovery.Be the reliable passage that reclaims coal gas simultaneously.Coal gas to 70 ℃～80 ℃ is further cooled off in mainly acting as by the method for water spray of dust removal installation, purifies coal gas simultaneously, stores coal gas.At the fire door place, flue-gas temperature is approximately 1400 ℃～1600 ℃, and temperature out is approximately 800 ℃～1000 ℃ after the flue cooling, and flue gas enters the overflow Venturi meter, and temperature is reduced to 70 ℃～80 ℃ rapidly in 1/50 second, removes the big particle in the flue dust simultaneously.Cooled smoke enters the path transfer Venturi meter after the elbow separator dehydration, the path transfer Venturi meter can be adjusted the aditus laryngis cross section according to the minute-pressure difference that flue fire door place records, thereby the control flue gas flow keeps within the specific limits.Flue gas cooling and smart dedusting once more in the path transfer Venturi meter simultaneously.Reclaim when requiring when gas quality meets, coal gas enters gas chamber by water seal reverse checkvalve and V-type water seal and stores.
The action principle of gasification cooling flue is: high-temperature flue gas is by gasification cooling flue, and because of the heating surface temperature is lower, high-temperature flue gas is passed to the heating surface cooling with the heat energy of self.Water in the heating surface tube because of having absorbed the evaporation of flue gas heat energy part, produces steam.Because water is constantly circulation in heating surface tube, has cooled off heating surface, and has made metal not overheated.Adopt gasification cooling flue, not only can reach the purpose of cooled flue gas, simultaneously again can production vapor recovery heat, for the production and the life use of factory.
Gasification cooling flue is made up of movable gas hood, mouth fixed section, interlude flue and flue latter end, and its structure as shown in Figure 2.Movable gas hood is generally pipe iris type structure above the fire door of converter.Movable gas hood needs the easy on and off lifting, to guarantee the petticoat pipe inner and outer air pressure about equally, both avoided escaping of flue gas to worsen the flushing and casting environment, and also do not sucked too much air and reduce the quality that reclaims coal gas, therefore each the stage movable gas hood in blowing can be adjusted to the gap that needs.Finishing blowing taps, when slagging tap, adding steel scrap, hot metal charging, petticoat pipe can rise, and does not hinder converter inclining.When needs were changed furnace lining, movable gas hood can be translated apart the body of heater top again.Movable gas hood generally has circulation loop of one's own.Movable gas hood top is mouth fixed section flue, adopts water seal to be connected between movable flue and the mouth fixed section usually, to reach the purpose of sealing.
Mouth fixed section, operating mode are abominable relatively.This section is generally pipe dividing plate form.Oxygen muzzle, charging opening are arranged on this section.The lower collecting box of mouth fixed section is generally heating surface, and periodic flame impingement lower collecting box makes the operating mode of lower collecting box more abominable.
Middle flue section is generally oblique straight section etc., comprises all flues of flue gas ascent stage.At present big portion is a pipe iris type structure.
The flue latter end is the flue gas downcomer.Mainly be for easy to connect with the rear portion dust removal installation.
The movable gas hood and the mouth fixed section flue of above-mentioned gasification cooling flue mainly have the following disadvantages:
1, under the heating cycle stable case, it is stable that flow operating mode also reaches gradually.At this moment, the working medium in the upcast is in the two-phase state of steam water interface, and the downtake inboard is monophasic water, perhaps is the big two phase fluid of steam quality and be the less two phase fluid of steam quality in the downtake in the upcast.After the two phase fluid that comes from upcast separated through carbonated drink, saturated vapor went to the air space of upper drum, saturation water then the hydrospace by upper drum back into downtake, thereby form circulating of water, as Fig. 3.Movable gas hood is near fire door, and operating mode is abominable, and heating surface is short.Heat pipe adopts the reaction of nature water cycle power slow, and relatively poor in blowing initial stage water power, pipe often can not get reliable cooling.Therefore the work-ing life of movable gas hood is all about half a year.When bessemerizing more than the 80t, the instantaneous heat load is very big, and when beginning to blow, moment produces a large amount of high-temperature flue gas especially, and heat pipe adopts traditional natural circulation, and the mobile cooling of the water in the pipe does not reach the requirement of evaporation, makes flue often produce fatigure failure.
2, be periodic owing to bessemerizing, during steelmaking oxygen blowing, the high-temperature flue gas flue of flowing through, the flue expanded by heating, converter stops blowing when adding steel scrap or tapping, the flue cooling is shunk, and this point reflection is still not obvious in the flue diametric(al), and bigger at flue length direction stroke, therefore must on flue structure, take in.
3, from gas recovery system figure as can be seen, converter gas rises to highest point along gasification cooling flue, drops to the overflow Venturi meter immediately, in the corner of these rise and fall, there is a big elbow interlude flue of flue and latter end flue junction.Smoke canal elbow place structure in the past as shown in Figure 4, flat segments is longer.The flat segments of flue is the most serious position of separation of two, as Fig. 5, is easy to cause booster.On the other hand, because temperature height, volume are big, so speed is fast in movable gas hood and mouth fixed section flue for converter gas, and is violent to washing away of tube wall.The flat segments of flue is generally near the flue end, when flue gas rises to herein since temperature reduce, smaller volume, so flow velocity also slows down, flue dust is piled up easily.The volume of smoke of piling up on the flue flat segments can influence the exchange of changing of heat pipe and flue gas, does not reach the effect of cooled flue gas, and has increased the workload when overhauling scarfing cinder.The key of problem is exactly that flat segments is longer, and 300～400mm is arranged approximately.
4, when the steel-making converter oxygen blast, oxygen (under 0.6～1.2MPa) state, carries out puffing by nozzle, makes air-flow quicken to penetrate the freedom of entry space from the high pressure in the oxygen cathete.Speed superelevation velocity of sound (generally reaching about 500m/s) during the Oxygen Flow mass flowing nozzle.When oxygen jet impacted bath surface, its surging force made it to form a pit, and oxygen jet can make the molten metal of impact zone and slag liquid hammer broken, makes it to generate a large amount of molten drops and slag drop, the source of splash that Here it is.In converting process, the oxide compound of iron and the carbide in the molten iron produce a large amount of carbon monoxide, emit a large amount of heats simultaneously.The gas of ejection is called furnace gas, and furnace gas has 10% burning approximately in movable gas hood, enters in the flue, is called flue gas this moment.Flue gas flow has caused acute washing away of splitting through flue to the flue heat pipe, makes the transducer wall ' s abrasion attenuate, produces fatigue cracking.
Summary of the invention:
The objective of the invention is to overcome above-mentioned deficiency, provide a kind of and can make the moving gasification cooling flue for steel-making converter that remains abundance, can stretch, can effectively solve flue flat segments separation of two problem and flue internal surface dry slag and sweep of gases problem at the flue length direction of in-pipe flow.
The object of the present invention is achieved like this: a kind of gasification cooling flue for steel-making converter, comprise: movable gas hood, mouth fixed section flue, interlude flue and latter end flue, movable gas hood places the converter top, movable gas hood, mouth fixed section flue, interlude flue and latter end flue are linked in sequence successively, it is characterized in that:
Addition one recycle pump in the circulating water loop between the upper header of a, described movable gas hood and mouth fixed section flue and the lower collecting box.Can change natural circulation like this is pump circulation, in-pipe flow is moved remain abundance, has satisfied the requirement of cooling evaporation.
Adopt expansion joint to be connected between b, described mouth fixed section flue and the interlude flue.Can absorb its stroke when expanding with heat and contract with cold in the flue operation so on the one hand, realize flexibly connecting, also can when flue is installed, eliminate the progressive error when installing on the other hand.
The oblique bent-tube boiler syndeton of small straight section is adopted in c, described interlude flue and latter end flue junction.Shortened the length of flue flat segments so greatly, 100mm is arranged approximately, efficiently solved the separation of two problem, dust stratification has not substantially simultaneously improved the labour intensity of steel-making.
D, the easiest dry slag of described flue and the most violent movable gas hood and the mouth fixed section flue internal surface of sweep of gases scribble nickel-chromiumcoating.Nickel-chromiumcoating material has high temperature resistance wearing and tearing and erosion-resisting characteristic, efficiently solves dry slag and sweep of gases problem, and several respects active effect has been played in converter steelmaking production:
1), prevents high temperature oxidation and corrosion erosion to tube wall;
2), prevent the wash away attenuate of flue gas particle to tube wall;
3), prevent the destruction of elevated temperature heat fatigue to tubing, avoid the generation of heat fatigue cracking;
4), significantly reduce slagging scorification dross phenomenon in the steelmaking process.
Through facts have proved, the supersonic speed nickel chromium triangle is sprayed on the effect that has reached following in the convertor steelmaking process:
1), the protection tube wall, prolong flue work-ing life;
2), stop to cause windfall loss because of tube wall breaks or pierced by high-temperature molten steel;
3), reduce steel-making labour intensity and upkeep operation amount;
4), improved steel-making operating procedure condition, make it can under more wide in range processing requirement, blow and spatter slag operation.
Description of drawings:
Fig. 1 produces steam and reclaims the gas process schema for adopting gasification cooling flue and dust removal installation.
Fig. 2 is a gasification cooling flue Facad structure synoptic diagram.
Fig. 3 is movable gas hood and mouth fixed section flue circulating water loop synoptic diagram in the past.
Fig. 4 is the interlude flue and the latter end flue syndeton synoptic diagram of gasification cooling flue in the past.
Fig. 5 is gasification cooling flue flat segments separation of two situation synoptic diagram in the past.
Fig. 6 is a mouth fixed section flue circulating water loop synoptic diagram of the present invention.
Fig. 7 is mouth fixed section flue of the present invention and interlude flue syndeton synoptic diagram.
Fig. 8 is interlude flue of the present invention and latter end flue syndeton synoptic diagram.
Fig. 9 is a gasification cooling flue structural representation of the present invention.
Figure 10 is the A-A cut-away enlarged view of Fig. 9.
Among the figure: steel-making converter 1, gasification cooling flue 2, overflow Venturi meter 3, elbow separator 4, path transfer Venturi meter 5, elbow separator 6, blower fan 7, by-pass valve 8, T-valve 9, chimney 10, water seal reverse checkvalve 11, V-type water seal 12, gas chamber 13, movable gas hood 14, mouth fixed section flue 15, the flexible coupling device 16 of sealing, interlude flue 17, latter end flue 18, charging opening 19, oxygen muzzle 20, upcast 21, downtake 22, drum 23, lower collecting box 24, flue flat segments 25, recycle pump 26, upper header 27, expansion joint 28, refractory materials 29, the oblique bent-tube boiler syndeton 30 of small straight section, coated material 31.
Embodiment:
Referring to Fig. 2, forced cyclic type gasification cooling flue for steel-making converter of the present invention is made up of movable gas hood 14, mouth fixed section flue 15, interlude flue 17 and latter end flue 18.Movable gas hood 14 places the converter top, and movable gas hood 14, mouth fixed section flue 15, interlude flue 17 and latter end flue 18 are linked in sequence successively.
Referring to Fig. 6, addition one recycle pump 26 in the bubble 23 of movable gas hood 14 and mouth fixed section flue 15 and the circulation loop between the lower collecting box 24.
Referring to Fig. 7, adopt expansion joint 28 to be connected between mouth fixed section flue 15 and the interlude flue 17.
Referring to Fig. 8, interlude flue 17 adopts the oblique bent-tube boiler syndeton 30 of small straight section with latter end flue 18 junctions.
Referring to Fig. 9,10, movable gas hood 14 and mouth fixed section flue 15 internal surfaces carry out nickel-chromium heat spray coating layer material 31 to be handled.
Claims (1)
1, a kind of gasification cooling flue for steel-making converter, comprise: movable gas hood (14), mouth fixed section flue (15), interlude flue (17) and latter end flue (18), movable gas hood (14) places the converter top, movable gas hood (14), mouth fixed section flue (15), interlude flue (17) and latter end flue (18) are linked in sequence successively, it is characterized in that:
Addition one recycle pump (26) in the last bubble (23) of a, described movable gas hood (14) and mouth fixed section flue (15) and the circulating water loop between the lower collecting box (24),
Adopt expansion joint (28) to be connected between b, described mouth fixed section flue (15) and the interlude flue (17),
C, described interlude flue (17) adopt the oblique bent-tube boiler syndeton of small straight section (30) with latter end flue (18) junction,
D, described movable gas hood (14) and mouth fixed section flue (15) internal surface scribble nickel-chromiumcoating (31).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100882680A CN100404698C (en) | 2006-06-30 | 2006-06-30 | Gasification cooling flue for steel-making converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100882680A CN100404698C (en) | 2006-06-30 | 2006-06-30 | Gasification cooling flue for steel-making converter |
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| Publication Number | Publication Date |
|---|---|
| CN1876852A true CN1876852A (en) | 2006-12-13 |
| CN100404698C CN100404698C (en) | 2008-07-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2006100882680A Active CN100404698C (en) | 2006-06-30 | 2006-06-30 | Gasification cooling flue for steel-making converter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101804501A (en) * | 2010-04-01 | 2010-08-18 | 中国二十二冶集团有限公司 | Ground assembling and welding integral installation and construction technology for vaporization-cooling chimney |
| CN101974719A (en) * | 2010-08-20 | 2011-02-16 | 洛阳钼业集团金属材料有限公司 | Out-of-furnace iron alloy smelting method and movable double smoke hood |
| CN104357612A (en) * | 2014-11-13 | 2015-02-18 | 江苏永钢集团有限公司 | Furnace mouth flue utilizing gas partition layer to prevent slagging |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| LU40535A1 (en) * | 1960-09-02 | 1961-10-23 | ||
| GB995631A (en) * | 1961-09-28 | 1965-06-23 | Trafik Ab | A device in furnaces delivering hot gases for cooling the gases and utilizing their heat content |
| JP2506277B2 (en) * | 1991-04-15 | 1996-06-12 | 日新製鋼株式会社 | Feedwater preheating system for converter boiler |
| CN2118737U (en) * | 1991-12-24 | 1992-10-14 | 上海冶金设计研究院 | Automatic offtake for converter waste gas |
| US6086817A (en) * | 1998-10-16 | 2000-07-11 | Bethlehem Steel Corporation | Off-gas hood for a basic oxygen furnace and method of repair |
| CN2470368Y (en) * | 2001-03-09 | 2002-01-09 | 涟源钢铁集团有限公司 | Independent boiler of rotary after-heat boiler |
-
2006
- 2006-06-30 CN CNB2006100882680A patent/CN100404698C/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101804501A (en) * | 2010-04-01 | 2010-08-18 | 中国二十二冶集团有限公司 | Ground assembling and welding integral installation and construction technology for vaporization-cooling chimney |
| CN101974719A (en) * | 2010-08-20 | 2011-02-16 | 洛阳钼业集团金属材料有限公司 | Out-of-furnace iron alloy smelting method and movable double smoke hood |
| CN101974719B (en) * | 2010-08-20 | 2012-08-29 | 洛阳钼业集团金属材料有限公司 | Out-of-furnace iron alloy smelting method and movable double smoke hood |
| CN104357612A (en) * | 2014-11-13 | 2015-02-18 | 江苏永钢集团有限公司 | Furnace mouth flue utilizing gas partition layer to prevent slagging |
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| Publication number | Publication date |
|---|---|
| CN100404698C (en) | 2008-07-23 |
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Address after: 214421 Jiangsu Province, Jiangyin City Industrial Park, No. 6 Hua Hua Town Patentee after: WUXI XIANGLONG ENVIRONMENT PROTECTION TECHNOLOGY CO., LTD. Address before: 214421 Jiangsu Province, Jiangyin City Industrial Park, No. 6 Hua Hua Town Patentee before: Jiangyin Hailu Metallurgy Equipment Co., Ltd. |