CN203625416U

CN203625416U - Converter mouth fixed-section flue of evaporative cooling flue for steelmaking converter

Info

Publication number: CN203625416U
Application number: CN201320791595.8U
Authority: CN
Inventors: 邓伟
Original assignee: JIANGYIN HAILU METALLURGY EQUIPMENT CO Ltd
Current assignee: Wuxi Xianglong Global Technology Co ltd
Priority date: 2013-12-05
Filing date: 2013-12-05
Publication date: 2014-06-04
Anticipated expiration: 2023-12-05

Abstract

The utility model relates to a converter mouth fixed-section flue of an evaporative cooling flue for a steelmaking converter. An oxygen gun muzzle and a charging hole are formed in the converter mouth fixed-section flue; each heated pipe of the charging hole and the oxygen gun muzzle comprises two parts, namely an inner pipe (2) and an outer pipe (1); the inner pipe (2) is hollowly sleeved with the outer pipe (1); cooling water is fed from the inner pipe (2) and then circulates to the outer pipe (1) so as to be discharged out of the outer pipe (1); each heated pipe forms a single loop; the inner wall of the outer pipe (1) is provided with multiple baffle rings I (3); the outer wall of the inner pipe (2) is provided with multiple baffle rings II (4) in a sleeved way; the baffle rings I (3) and the baffle rings II (4) are arranged in a staggered way; a spiral groove is formed respectively in the inner wall of the outer pipe (1) and the outer wall of the inner pipe (2). The converter mouth fixed-section flue has a good cooling effect.

Description

The mouth fixed section flue of gasification cooling flue for steel-making converter

Technical field

The utility model relates to a kind of mouth fixed section flue of gasification cooling flue for steel-making converter, cooling for the high-temperature flue gas of steelmaking process is carried out, and belongs to steel-making converter equipment technical field.

Background technology

Linz-Donawitz process is nearest more than 50 years institute's a kind of steel-smelting technologies of producing and growing up, and it does not need outer heat supplied, is the carbon that utilizes in molten iron self, closes with technical pure oxidation, produces heat, for the needs of making steel;

Oxygen, by oxygen rifle, from converter mouth top, is deep into the suitable position above of molten iron in converter, blows; In converting process, the carbide in oxide compound and the molten iron of iron produces a large amount of carbon monoxide, emits 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 (approximately 10%); The temperature of furnace gas in stove is at 1400 ℃ ~ 1600 ℃;

Owing to producing a large amount of coal gas of converter (carbon monoxide) in steelmaking process, generally all adopt gasification cooling flue and dust removal installation to produce steam, gas recovery, its technique is, converter gas borrows blower fan suction to enter gasification cooling flue, recovery part fume afterheat, enter the dedusting of overflow Venturi meter from top from gasification cooling flue flue gas out cooling, the path transfer Venturi meter that enters bottom after elbow separator dehydration carries out smart dedusting, gas after dedusting is dewatered by elbow separator, purified gas passes through three-way switch valve after pressurizeing by blower fan, entering gas storage holder stores,

In whole system, main device is made up of converter, gasification cooling flue and dust removal installation---and wherein, gasification cooling flue is installed on converter top, high-temperature flue gas is cooled to 800 ℃ ~ 1000 ℃, produce steam, reach the object of waste heat recovery, be also the reliable passage of gas recovery simultaneously; The Main Function of dust removal installation is by the further cooling coal gas to 70 of method ℃ of water spray ~ 80 ℃, purifies coal gas simultaneously, stores coal gas;

At fire door place, flue-gas temperature is approximately 1400 ℃ ~ 1600 ℃, and after flue is cooling, temperature out is approximately 800 ℃ ~ 1000 ℃, and flue gas enters overflow Venturi meter, and in 1/50 second, temperature is down to rapidly 70 ℃ ~ 80 ℃, removes the big particle in flue dust simultaneously; Cooled flue gas enters path transfer Venturi meter after elbow separator dehydration, and the micro-pressure-difference that path transfer Venturi meter can record according to flue fire door place is adjusted aditus laryngis cross section, keeps within the specific limits thereby control flue gas flow; Flue gas cooling and smart dedusting again in path transfer Venturi meter simultaneously; Reclaim while requiring when gas quality meets, coal gas enters gas chamber by water seal inverted valve and V-type water seal and stores;

In above-mentioned technological process, the action principle of gasification cooling flue is: high-temperature flue gas is by gasification cooling flue, and because heating surface temperature is lower, high-temperature flue gas, by the heat energy of self, is passed to heating surface cooling.Water in heating surface tube, because having absorbed the evaporation of smoke heat energy part, produces steam; Simultaneously due to water constantly circulation in heating surface tube, cooling heating surface, and make metal not overheated; Adopt gasification cooling flue, not only can reach the object of cooled flue gas, simultaneously again can production vapor recovery heat, for the production of factory with live;

Generally speaking, gasification cooling flue is made up of movable gas hood, mouth fixed section, interlude flue and flue latter end;

Wherein, movable gas hood is above the fire door of converter, be generally pipe iris type structure, movable gas hood needs easy on and off lifting, roughly equal to guarantee petticoat pipe inner and outer air pressure, both avoided escaping of flue gas to worsen flushing and casting environment, do not suck too much air and reduce the quality of gas recovery yet, therefore can be adjusted at each stage movable gas hood of blowing the gap needing, finishing blowing taps, while slagging tap, add steel scrap, hot metal charging, petticoat pipe can rise, and does not hinder converter inclining, in the time that needs are changed furnace lining, movable gas hood can be translated apart again body of heater top.Movable gas hood generally has circulation loop of one's own, and movable gas hood top is mouth fixed section flue, conventionally adopts water seal to be connected, to reach the object of sealing between movable flue and mouth fixed section;

Mouth fixed section, operating mode is relatively severe, and this section is generally pipe dividing plate form, and oxygen muzzle, charging opening are arranged in this section.The lower collecting box of mouth fixed section is generally heating surface, and periodically flame impingement lower collecting box, makes the operating mode of lower collecting box more severe;

Middle flue section, is generally oblique straight section etc., comprises all flues of flue gas ascent stage; At present large portion is pipe iris type structure;

Flue latter end is flue gas downcomer; Mainly for easy to connect with rear portion dust removal installation;

In these building blocks, mouth fixed section flue is owing to bearing the important task of high-temperature flue gas being carried out to first contact, and therefore its cooling performance direct relation the cooling performance of whole gasification cooling flue;

But, find that in actual use the mouth fixed section flue of above-mentioned gasification cooling flue mainly has the following disadvantages:

Mouth fixed section oxygen muzzle and charging opening water-cooling pattern generally have two kinds: board-like and tubular type---plank frame is that steel plate is rolled into inner-outer sleeve, centre is separated into circulation loop with water-stop sheet, water coolant is at chuck internal recycle, shortcoming is that the gap of water-stop sheet and overcoat cannot be welded, easily string water, causes the short circuit in water route; Tubular structure is lower collecting box water inlet, is assigned to heat pipe, then is pooled to upper header water outlet, and shortcoming is also to distribute inequality.Therefore mouth fixed section flue work-ing life of the gasification cooling flue of above two kinds of water-cooling patterns shorter, be only about half a year;

Our company has developed the special mouth fixed section flue that the patent No. is 200620073682 for this reason, but finds in actual use, and its cooling performance need to improve.

Summary of the invention

The purpose of this utility model is to overcome above-mentioned deficiency, and a kind of mouth fixed section flue of gasification cooling flue for steel-making converter of good cooling results is provided.

The purpose of this utility model is achieved in that a kind of mouth fixed section flue of gasification cooling flue for steel-making converter, on mouth fixed section flue, offer aerobic muzzle and charging opening, the heat pipe of described charging opening and oxygen muzzle is made up of inner and outer tubes two portions, outer tube is placed in outside inner tube, water coolant is from interior water inlet tube, be circulated to outer tube water outlet, every heat pipe forms an independent loop, on the inner tubal wall of described outer tube, be provided with multiple baffle rings one, on the outer tube wall of described inner tube, be set with multiple baffle rings two, and baffle ring one and baffle ring two are staggered.

The mouth fixed section flue of the utility model gasification cooling flue for steel-making converter, is provided with spiral slot on the inner tubal wall of described outer tube, on the outer tube wall of described inner tube, is provided with spiral slot.

Compared with prior art, the beneficial effects of the utility model are:

The utility model makes flow of cooling water more even by increasing baffle ring and spiral slot, has increased cooling performance.

Accompanying drawing explanation

Fig. 1 is the structural representation of the mouth fixed section flue of the utility model gasification cooling flue for steel-making converter.

Fig. 2 is the structural representation of the outer tube of the mouth fixed section flue of the utility model gasification cooling flue for steel-making converter.

Fig. 3 is the structural representation of the inner tube of the mouth fixed section flue of the utility model gasification cooling flue for steel-making converter.

Wherein:

Outer tube 1, inner tube 2, baffle ring 1, baffle ring 24.

Embodiment

Referring to Fig. 1 ~ 3, the mouth fixed section flue of a kind of gasification cooling flue for steel-making converter that the utility model relates to, on mouth fixed section flue, offer aerobic muzzle and charging opening, the heat pipe of described charging opening and oxygen muzzle is made up of inner and outer tubes two portions, outer tube is placed in outside inner tube, and water coolant, from interior water inlet tube, is circulated to outer tube water outlet, every heat pipe forms an independent loop

On the inner tubal wall of described outer tube 1, be provided with multiple baffle rings 1, on the outer tube wall of described inner tube 2, be set with multiple baffle rings 24, and it (is that baffle ring 1 inserts in the gap of two baffle rings 24 of adjacent setting that baffle ring 1 and baffle ring 24 are staggered, same baffle ring 24 inserts in the gap of two baffle rings 1 of adjacent setting), the staggered existence of the baffle ring 24 of baffle ring 1 makes water coolant can fill uniformly completely whole space, has increased cooling effect; Meanwhile, in order to make water coolant Uniform Flow, on the inner tubal wall of described outer tube 1, be provided with spiral slot, on the outer tube wall of described inner tube 2, be provided with spiral slot, thereby make water coolant along spiral slot Uniform Flow, to have increased cooling performance; Meanwhile, in order to increase gas heat exchange area, can also on the outer tube wall of outer tube 1, fin be installed, increase the contact area of heat pipe and high-temperature tail gas, make heat exchange more abundant.

When work, water coolant is entered by inner tube 2, derived by outer tube 1, and in derivation process, under the cooperation of baffle ring 1 and baffle ring 24, and the lower Uniform Flow of the spiral fluted of outer tube 1 and inner tube 2 guiding, cooling performance increased.

Claims

1. the mouth fixed section flue of a gasification cooling flue for steel-making converter, on mouth fixed section flue, offer aerobic muzzle and charging opening, the heat pipe of described charging opening and oxygen muzzle is made up of inner tube (2) and outer tube (1) two portions, outer tube (1) is placed in outside inner tube (2), water coolant is intake from inner tube (2), be circulated to outer tube (1) water outlet, every heat pipe forms an independent loop, it is characterized in that:

On the inner tubal wall of described outer tube (1), be provided with multiple baffle rings one (3), on the outer tube wall of described inner tube (2), be set with multiple baffle rings two (4), and baffle ring one (3) and baffle ring two (4) are staggered.

2. a kind of mouth fixed section flue of gasification cooling flue for steel-making converter as claimed in claim 1, is characterized in that: on the inner tubal wall of described outer tube (1), be provided with spiral slot, on the outer tube wall of described inner tube (2), be provided with spiral slot.