Blast furnace swinging flow jet smoke catching cover
The utility model relates to a kind of blast furnace swinging flow jet accessory, relates in particular to a kind of blast furnace swinging flow jet smoke catching cover.
Blast-melted, flow to swinging flow jet and come down in torrents to the process of hot-metal ladle and carriage from iron runner from swinging flow jet, there are two big discrepancy in elevation, molten iron speed is fast, flow is big, and high temperature liquid iron and ambient air short-time contact form stronger hot plume phenomenon, produces volume of smoke.In addition for the ease of operation and repair and maintenance, the swinging flow jet cover plate is provided with open vision slit, therefore usually has a large amount of flue gases to emerge from vision slit, not only influences the power house environment health, also usually cause operator can't in time observe the MOLTEN STEEL FLOW situation, cause industrial accident.
At present, the pattern of smoke catching cover is adopted in the dedusting of blast furnace swinging flow jet more, and its structure is made up of box frame, cover plate, suction opening, and flue dust is controlled in the fume trap cover as far as possible, by suction opening flue dust is evacuated to the fly-ash separator emission abatement.Commonly used improving one's methods mainly is to adopt the method that increases air quantity, reduces the resistance of ducting, but effect is unsatisfactory, also causes system energy consumption to increase, and investment increases.
Summary of the invention
The utility model is in order to overcome the deficiencies in the prior art, and provide a kind of simple in structure, prevent that effectively the swinging flow jet flue dust is excessive, improve the blast furnace swinging flow jet smoke catching cover of workman's operating environment greatly.
The technical solution adopted in the utility model is: blast furnace swinging flow jet smoke catching cover, it comprises framework, and framework is rectangular concrete structure wall, is equipped with suction opening on the concrete structure wall on two long limits, suction opening links to each other with an end of induced exhaust, and the other end of induced exhaust links to each other with vacuum fan; The upper end of framework is provided with top cover, top cover is provided with vision slit, and the bottom of framework is fixed on the supporting leg, and swinging flow jet is arranged on inside of frame, the output port of molten iron groove passes framework and is positioned at inside of frame, and the output port of molten iron groove is positioned at the top of swinging flow jet; The below at swinging flow jet two ends all is provided with hot-metal ladle and carriage; It is characterized in that: the bottom of framework is provided with base plate, offers the molten iron head piece over against the hot-metal ladle and carriage place on the base plate.
Described suction opening is arranged on 200～500mm place under the top cover, the form that two suction openings adopt diagonal angle, long limit to arrange, and the width between centers minor face of suction opening is 2000mm～3000mm.
The technique effect that the utility model is obtained: the utility model is simple in structure, prevents effectively that by being provided with of base plate and suction opening the swinging flow jet flue dust is excessive, improves workman's operating environment greatly, improves workman's efficiency.
Description of drawings
Fig. 1 is a sectional view of the present utility model;
Fig. 2 is the vertical view of Fig. 1.
Wherein, 1-framework, 2-top cover, 3-vision slit, 4-supporting leg, 5-swinging flow jet, 6-molten iron groove, 7-hot-metal ladle and carriage, 8-base plate, 9-molten iron head piece, 10-suction opening.
Below in conjunction with accompanying drawing embodiment of the present utility model is described further.
Referring to Fig. 1-2, blast furnace swinging flow jet smoke catching cover, it comprises framework 1, framework 1 [is respectively leading flank concrete structure wall, trailing flank concrete structure wall, left surface concrete structure wall, right flank concrete structure wall, is coated with refractory materials on the metope of concrete structure wall for rectangular concrete structure wall; Top among Fig. 2 is a trailing flank, bottom is a leading flank, the left side is a left surface, the right is a right flank], be equipped with suction opening 10 (i.e. 2 suction openings 10 on the concrete structure wall (being leading flank concrete structure wall, trailing flank concrete structure wall) on two long limits, suction opening is distributed in framework not on the ipsilateral), suction opening 10 links to each other with an end of induced exhaust, and the other end of induced exhaust links to each other with vacuum fan; The upper end of framework 1 is provided with top cover 2, top cover 2 is provided with vision slit 3 (among present embodiment Fig. 2 being 3), the bottom of framework 1 is fixed on the supporting leg 4 and (is at least 3 supporting legs 4), swinging flow jet 5 is arranged on the inside of framework 1, the output port of molten iron groove 6 passes the inside that framework 1 is positioned at framework 1, and the output port of molten iron groove 6 is positioned at the top of swinging flow jet 5; The below at swinging flow jet 5 two ends all is provided with hot-metal ladle and carriage 7 (i.e. 2 hot-metal ladle and carriages 7); The bottom of framework 1 is provided with base plate 8, offers molten iron head piece 9 (i.e. 2 molten iron head pieces 9) on the base plate 8 over against hot-metal ladle and carriage 7 places.
Described suction opening 10 is arranged on 2 times 200～500mm places of top cover, and (suction opening 10 is near the top cover place, the top that is suction opening 10 is 200～500mm) apart from the distance of top cover, the suction opening size can be determined according to the requirement of cross section mean wind speed 10～16m/s, two suction openings adopt the form that diagonal angle, long limit is arranged in the cover, the width between centers minor face of suction opening is that (central point that promptly is positioned at the suction opening on the leading flank concrete structure wall is 2000mm～3000mm apart from the distance of right flank concrete structure wall to 2000mm～3000mm, and the central point that is positioned at the suction opening on the trailing flank concrete structure wall is 2000mm～3000mm) apart from the distance of left surface concrete structure wall.
The bottom of described blast furnace swinging flow jet smoke catching cover adopts base plate to reduce incoming air area, and sealing effectiveness is not less than 45%.
Top cover is made up of steel plate and heat-resisting mould material, and vision slit is opened on top cover, and end face is smooth, and bearing capacity is big; Base plate adopts steel plate to add heat-resisting spray material and makes, and is used for reducing incoming air area; Suction opening adopts three air port side draughts or two air ports to the suction form, and absolute altitude is a little less than top blind flange, and air port size, particular location are determined by numerical simulation, theoretical checking computations according to the exhaust gas volumn of different stage blast furnace.By suction opening, form negative pressure in the cover, the smoke catching in the swinging flow jet fume trap cover to fly-ash separator, and is guaranteed that flue dust can not overflow from vision slit.
The design of blast furnace swinging flow jet smoke catching cover at first needs the fume trap cover of the formation of the framework of multi-form box and top cover is estimated the air-flow arrangement form that cover is interior, the position of rational suction opening is proposed then, set up the rational numerical simulation, draw the position and the size of back-plane design requirement and top cover upper observation hole after the analysis, thereby obtain being fit to the multi-form smoke catching cover of each blast furnace.The fume trap cover bottom can be according to air-flow distribution form in the cover, and the fume trap cover bottom increases base plate, reduces incoming air area, and under the equal air quantity of dust-removal system, cover inner top negative pressure obviously increases, and has eliminated the excessive phenomenon of top view hole place's flue dust.Suction opening top absolute altitude is lower than the fume trap cover top cover, under the equal air quantity of dust-removal system, has effectively changed air current composition form in the cover, subdues the shock action of elevated temperature heat pressure gas stream to the top board vision slit, improves suction opening smoke catching effect.
The blast furnace discharge yard dedusting is the key link that solution is badly in need of in iron and steel enterprise's environment control.This fume trap cover both can have been realized the planarization of casting house platform, satisfied processing requirement, can prevent effectively that again the swinging flow jet flue dust is excessive, improved workman's operating environment greatly, improved workman's efficiency, real realization " cleaner production ".After using this novel fume trap cover, flue dust excessive phenomenon in swinging flow jet top disappears, and casting house platform dust removing effects improves greatly.
Protection domain of the present utility model is not limited to the above embodiments, and obviously, those skilled in the art can carry out various changes and distortion and not break away from scope and spirit of the present utility model the utility model.If these changes and distortion belong in the scope of the utility model claim and equivalent technologies thereof, intention then of the present utility model also comprises these changes and is out of shape interior.