CN2910950Y - Small straight section unsymmetrical bending tube type evaporated cooling flue of steelmaking converter - Google Patents

Abstract

The utility model relates to a little direct segment oblique elbow type vaporizing cooling flue used in steelmaking converter, the vaporizing cooling flue is used for recovering the residual heat generated by converter steel making. The vaporizing cooling flue includes a movable chimney hood (14), a converter mouth fixed segment flue (15), an intermediate regime flue (17) and a terminal flue (18),the movable chimney hood (14) is provided above the converter,the movable chimney hood (14),the furnace mouth fixed segment flue(15), the intermediate regime flue (17) and the terminal flue (18) are connected in turn,the vaporizing cooling flue is characterized in that the intermediate regime flue (17) and the terminal flue(18) is using the little direct segment oblique elbow type connecting structure (21) in the junction. The structure greatly shortens the length of the straight segment of the flue about 100mm, solves the problem of steam-water layered effectively without ash deposition almostly, and improves the labor intensity of steelmaking.

Description

The oblique bent-tube boiler gasification cooling flue for steel-making converter of small straight section

Technical field:

The utility model relates to a kind of gasification cooling flue for steel-making converter, is specifically related to the oblique bent-tube boiler gasification cooling flue for steel-making converter of a kind of small straight section.Belong to the 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 900 ℃～1100 ℃ after the flue cooling, and flue gas enters the overflow Venturi meter, and temperature is reduced to 70 ℃～80 ℃ rapidly in 1/15 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.

Above-mentioned gasification cooling flue mainly has the following disadvantages:

As can be seen, converter gas rises to highest point along gasification cooling flue from gas recovery system figure, drops to the overflow Venturi meter immediately, and 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 3, flat segments is longer.

The flat segments of flue is the most serious position of separation of two, as Fig. 4, 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.

Summary of the invention:

The purpose of this utility model is to overcome above-mentioned deficiency, and a kind of oblique bent-tube boiler gasification cooling flue for steel-making converter of small straight section that can effectively solve flue flat segments separation of two problem is provided.

The purpose of this utility model is achieved in that the oblique bent-tube boiler gasification cooling flue for steel-making converter of a kind of small straight section, 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: the oblique bent-tube boiler syndeton of small straight section is adopted in 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.

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 the interlude flue and the latter end flue syndeton synoptic diagram of gasification cooling flue in the past.

Fig. 4 is gasification cooling flue flat segments separation of two situation synoptic diagram in the past.

Fig. 5 is the interlude flue and the latter end flue syndeton synoptic diagram of the utility model cooling stack.

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, flue flat segments 21, the oblique bent-tube boiler syndeton 22 of small straight section.

Embodiment:

Referring to Fig. 5, the oblique bent-tube boiler gasification cooling flue for steel-making converter of the utility model small straight section, by 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.Interlude flue 17 adopts the oblique bent-tube boiler syndeton 22 of small straight section with latter end flue 18 junctions, shorten the length of flue flat segments so greatly, 100mm has been arranged approximately, efficiently solved the separation of two problem, dust stratification has not substantially simultaneously improved the labour intensity of steel-making.

Claims (1)

1, the oblique bent-tube boiler gasification cooling flue for steel-making converter of a kind of small straight section, 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: described interlude flue (17) adopts the oblique bent-tube boiler syndeton of small straight section (21) with latter end flue (18) junction.

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