CN2084937U - Tubular tuyere for small iron-smelting furnace - Google Patents

Abstract

The utility model relates to a cross flow type tuyere for a small-sized iron-smelting blast furnace, which is a main consumption spare part apparatus for the blast furnace. Due to an unreasonable cooling mode and an unreasonable structural form, the service lives of present traditional hollow cavity type and improved spiral pipe type tuyeres are short. According to a cross flow type high speed water cooling principle, the utility model designs a noveltuyere with a three-chamber one-cavity four-flow speed cooling structure. Compared with the traditional tuyeres, the service life of the utility model is extended more than 7 times. Thereby, the delay ratio of the iron-smelting blast furnace is reduced, and iron-smelting output is increased.

Description

Tubular tuyere for small iron-smelting furnace

The utility model is the throughflow tuyere that a kind of small-sized iron-smelting blast furnace uses.

Iron-smelting blast furnace is perpendicular shape stove, divides five sections of furnace throat, shaft, furnace bosh, bosh and cupola wells from top to bottom.In the smelting process, the high-temperature hot-air that hotblast stove forms is sent into blast furnace along the air port that the cupola well body distributes again through pipeline.Inlet front end stretches in the stove, is in the encirclement and the impact of high temperature (more than 1500 ℃) heat-flash stream, and slag, iron invade be stained with, therefore often work-ing life is not long, needs often replacing.The air port in use, the type of cooling is a water-cooled.The air port source of damage mainly is cooling heat transferring ability (a heat exchange value), is lower than hot-fluid summit value in the blast furnace, so the type of cooling and exchange capability of heat directly influence the length in work-ing life in air port.Work-ing life is short, blast furnace staying rate height then, and ironmaking output is just low; Otherwise then comprehensive benefit is just high.

At present China's number is in 1,100 small-sized iron-smelting blast furnace (300m ³Below), the air port of using has only two types: a kind of cavity air port as traditional type; Another kind is the spiral air port.The former adopts water at atmospheric pressure to inject the air port inner chamber, water constantly overflows in the chamber and constantly replenishes, thereby take away the heat of air port outer front end carrying, air port itself is by big copper content 98.5% casting of thermal conductivity, its shortcoming is that cooling can not form eddy flow, can only keep conventional flow velocity, so exchange capability of heat is low, when the working of a furnace was smooth and easy, mean lifetime was also only about one month.The latter adopts high pressure water to supply water, and the air port appearance turns to close apart from spirrillum with the big copper tube of thermal conductivity, and exchange capability of heat increases substantially than the former, but also less than two months of mean lifetime, and the air port furnace interior divides intensity low; Be subjected to the little restriction in zone again, change poles inconvenience is more invaded by slag iron when spiral tube especially and is stained with and breakage when leaking, and is not easy discovery.

The big-and-middle-sized iron-smelting blast furnace of China has been introduced " the high flow rate method of cooling in air port "-patent No. 889165 special public clear 50-27444 of Japan.According to the big-and-middle-sized blast furnace of China characteristics and practical situation separately, the air port of having designed and having used the high flow rate method of cooling.And the present small blast furnace of China is owing to the restriction of many conditions, the air port of failing to design and use this method all the time.

The purpose of this utility model, be to get rid of traditional cavity air port and spiral air port short shortcoming in work-ing life, according to tubular high speed water cooling principle, change the type of cooling and structure formation, design the long lifetime throughflow tuyere that a kind of suitable small-sized iron-smelting blast furnace is produced.

The utility model feature is that it has the heat exchange structure of one chamber, three Room, four flow velocitys, and first Room of termination is the round rectangle cross section, and second Room of body and cross section, the 3rd Room also are the round rectangle cross section; Also in the body body, four flow velocitys are the water coolant of cavity permanent current speed in one chamber, the water coolant that first Room, second Room and the 3rd Room speed are reduced gradually by height; Water coolant is middle pressure (0.2-0.5mpa), middle flow (10.5-12.5m ³/ n).Cupric 99.97%T is adopted in the termination ₂The red copper hot stamping forms.

Advantage of the present utility model is the heat exchange structure form of one chamber, three Room, four flow velocitys, thereby cooling-water flowing obtains high flow velocities, and press certain orientation from strong heat affected zone, termination, air port, begins directed flow and finishes heat transfer process; Because the material T of stove surfaces externally and internally is stretched in the termination, air port ₂Red copper forging and pressing processing, so Zu Zhi Cause is close, physical strength big and have high thermal conductivity; The circulation cooling tank is the round rectangle cross section, dwindles inside and outside heating surface area ratio, is directed transmission rapidly thereby the high-temperature heat flux that wraps the Naked air port in the stove is separated, and has guaranteed that the air port foremost not by scaling loss, brings up to more than six months the life-span; Tuyere body inner chamber water coolant is that normal speed flows, and the body material is poor than the termination capacity of heat transmission in addition, so that the unlikely water that too is cooled of the hot blast that the air port inner chamber blows changes is low, the hot blast that has also guaranteed hotblast stove blows temperature in the blast furnace through the air port inner chamber.

Below in conjunction with accompanying drawing the utility model is described in further detail.

Fig. 1 is the throughflow tuyere wiring layout;

Fig. 2 is throughflow tuyere body part figure;

Fig. 3 is a throughflow tuyere termination parts drawing;

Fig. 4 is the throughflow tuyere left view;

Fig. 5 is a throughflow tuyere termination left view.

As shown in Figure 1, throughflow tuyere is made up of termination (1), body (2) and plug wire (3) parts, termination and this body and function argon shield weldering welding fabrication.First Room connects the intravital cavity of body in the body of termination, second Room and the 3rd Room connect with first Room again.

The termination as shown in Figure 3, by the T of cupric 99.97% ₂Copper sheet hot stamping moulding, the bottom, termination is washed into the round rectangle circulating tanks, and the interior core wall by a projection of groove makes and encircles not UNICOM.

Body causes type by the casting in bronze that contains greater than 98.5% as shown in Figure 2.Divide inside and outside two-layer.Internal layer is a cavity, and front end is opened a high pressure mouth of a river at the bottom of the chamber; Outer anterior for along two unequal section rectangular tanks on the generatrix spiral, matches with the interference form after machining with termination (1) inner conical surface in the spiral slot surface; The cavity end face has four silk holes, and except that two Inlet and outlet water apertures, back plug wire (3) plug-hole has been made in all the other two apertures.

This project organization form has just formed one chamber, three Room, four flow velocitys, the throughflow tuyere that flow supplies water in the middle pressure.The cross section of three chambers all is designed to the round rectangle cross section.Section area is followed successively by the first Room 3.5cm ², the second Room 3.6cm ²With the 3rd Room 4.2cm ²Middle pressure is that 0.2～0.5mpa and middle flow are 10.5～12.5m ³The water coolant of/n injects the body cavity from water inlet, and the current that change over 10m/s through the high pressure mouth of a river, bottom inject in front end (termination) the round rectangle circulating tanks.I.e. first Room; Detour step one week the back blocked by core wall and flow to body, in the second cross section spiral slot, i.e. second Room, this moment, flow velocity was 9.7m/s; Again along one week of body eddy flow, flow velocity was slightly reduced to 8.3m/s and was entered in the 3rd cross section spiral slot this moment, i.e. the 3rd Room; One week of eddy flow flows out from water outlet more at last, forms one chamber, three Room, four flow velocitys, i.e. the front end first Room flow velocity maximum, and second and third chamber flow velocity reduces gradually, and cavity is Chang Su, thereby obtains the extremely strong effect of heat exchange, finishes the cooling heat transferring process.

Claims (2)

1, a kind of small-sized iron-smelting blast furnace throughflow tuyere that is used for heat air delivery, form by termination (1), body (2) and plug wire (3) parts, it is characterized in that, it has the heat exchange structure of one chamber, three Room, four flow velocitys, first Room of termination is the round rectangle cross section, second Room of body and cross section, the 3rd Room also are the round rectangle cross section; One chamber is also in the body body; Four flow velocitys are the water coolant of cavity permanent current speed, the water coolant that second Room, first Room and the 3rd Room speed are reduced gradually by height; Water coolant is middle pressure (0.2-0.5mpa), middle flow (10.5-12.5m ³/ h).

2, small-sized iron-smelting blast furnace throughflow tuyere according to claim 1 is characterized in that, T is adopted in the termination ₂Red copper hot stamping moulding.

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