UA73819C2 - Tank viaduct of a blast-furnace - Google Patents

Abstract

This invention relates to metallurgy, in particular, to structure of tank viaduct providing loading of charge to the blast furnace. The viaduct of blast furnace has coke tanks with screening mechanisms, tanks for agglomerate, for rolls and other admixtures, drum gate-feeders, supports of the viaduct, console beams, scale-car for charge weighting and transportation, two tanks for agglomerates and the rolls. The left and the right tanks, 450 m3 each, are mounted to the unloading viaduct of the ore yard at the side of the blast furnace, symmetrically with respect to the inclined bridge. The upper part of the one-slope side of each tank surrounds the support-console of the unloading rail track. The lower pyramid part of each tank goes through reinforced-concrete ceiling to closed premises equipped with dust aspiration. The tanks are in the lower part equipped with vibro-feeders and mechanisms for the fine fractions screening. The drive conveyors go with the lower part through the cuts of the viaduct supports to the closed premises in the ore yard to the tank screening mechanisms, and with the upper part those go to the weight craters in the skip hole. The weight craters have dust suction units and are equipped with closed troughs, through those the agglomerate and the rolls are loaded to skips. This invention promotes improvement of gas permeability of the charge, effective use of gas flow in the furnace, increase of the term of operation of the car-balance and all the tank system, to improvement of environment.

Description

Description of the invention

The device refers to ferrous metallurgy, in particular to the structures of bunker overpasses adjacent to the 2nd ore yard, with the help of which a stock of charge materials is created near the furnace, the technology of loading mine blast furnaces is offered and can be applied to operating blast furnaces without stopping production.

Known: 1. Bunker overpass, where collection, weighing, delivery to the skip pit and technological loading of the charge in 70 skips is carried out by weighing wagons without screening out small fractions (0...5 mm) from agglomerate and pellets. 2. Bunker overpass, where the technological loading of the charge into skips is carried out by belt conveyors with screening of small fractions (0...5 mm) from agglomerate and pellets in the under-bunker room | see NTI of ferrous metallurgy "Mechanical equipment of blast furnaces" M., 1962. N.S. Shchyrenko, section II, pp. 175-179), see Proceedings of the NTT of ferrous metallurgy, volume KHMIY! M., 1958, p. 464, fig. 4|. 19 The disadvantages of these bunker overpasses are:

In the first - the absence of screening of small fractions, the presence of a large number of small-capacity bunkers, dispersal of mechanisms, drum shutters of feeders. The dusty, stressful working conditions of the scale car when loading agglomerate and pellets quickly disable the weighing and other mechanisms, which creates errors during batch loading (without taking into account additional errors related to the qualifications of the scale car drivers), reduces the service life of the scale car and the reliability of the entire system, insufficient aspiration of dust.

In the second - the complexity of the device, a large number of bunkers, shutters of electrovibrating feeders, sieves, conveyors, the impossibility of its arrangement without radical reconstruction during a complete, long-term stoppage of production (blast furnace), insufficient aspiration of dust.

The closest in terms of technical essence to the proposed overpass is the bunker overpass of the blast furnace, which with 29 consists of two-row bunkers (about ЗB5 pcs.) with a geometric capacity of УОм З each, which rest on Ge) vertical supports and transverse beams with cantilevers, located symmetrically with respect to the axis of the path movement of weigh wagons, perpendicular to the axis of the inclined bridge in the lower part, closed by drum shutters-feeders. Under the bunkers, a path is laid for weighing wagons, which are used for collection, weighing, delivery to the skip pit, and technological loading of the charge into the skips. F

The disadvantage of the known design is: -- a) The lack of screening of small fractions (0...5 mm) from the agglomerate and pellets worsens the gas permeability of the charge, which does not allow to effectively use the gas flow in the blast furnace process, to increase the productivity of the furnace, to apply a sufficient amount of fuel additives for blasting (pulverized coal fuel, natural gas, coke gas, fuel oil), to improve the technical and economic performance of the blast furnace. b) The presence of a large number of bunkers (about 35 pcs.), dispersion of mechanisms, feeder shutters - creates tension and reduces the reliability of the entire batch loading system. c) The dusty, stressful working conditions of the scale car when loading agglomerate and pellets reduce their service life, create errors during the selection and weighing of the charge (without taking into account additional errors related to the "du qualification" of the scale car drivers). -o d) An inefficient aspiration system when loading agglomerate and pellets with scale cars creates dusty, harmful working conditions for scale car drivers and workers of the under-bunker space, environmental tension around the bunker overpass.

The purpose of the proposed bunker overpass - without radical reconstruction, stop production by combined loading of the charge into skips: - agglomerate and pellets through two large bunkers with screening -1,395 small fractions (0...5 mm) by conveyors automatically through weighing funnels, fluxes and other additives weigh wagons - to improve the gas permeability of the charge column, to increase the efficiency of using the gas flow in the blast furnace (95) process with the use of the optimal amount of fuel additives for blasting (pulverized coal fuel, natural gas, coke gas, fuel oil). To increase the service life of the scale car and all bunker overpasses, to increase the reliability of work, to reduce the weight error, to improve the aspiration of dust. - 70 The specified goals are achieved due to the fact that the existing bunker flyover is made with two single-slope bunkers (left A, right B, see Fig. 1) for agglomerate, pellets, with a geometric capacity of 450m each, mounted in the unloading flyover of the ore yard from the side of the blast furnace (see Fig. 2) symmetrically to the axis of the inclined bridge, and the upper part of the single-sloped side 1 of the bunker (see Fig. 2, 3) covers the supports-consoles 2 of the unloading railway track of the overpass of the ore yard, the lower - pyramidal 3, passing Through the reinforced concrete floor 4 into the closed room 5, which is equipped with electric vibratory feeders 6, (F) seeding mechanisms 7, two conveyors 8 (left, right). Conveyors are installed according to the scheme of an isosceles triangle (see Fig. 7, 2) symmetrically to the axis of the inclined bridge at an angle of 169 to the horizon, and transport agglomerate or pellets perpendicular to the axis of movement of the wagon-weight. In the lower part, they pass through the slots 9 (see Fig. 2) of the unloading trestle supports into a closed room in the ore yard to the seeding mechanisms, in the upper part - at an angle of 162 to the horizon and 302 to the axis of the inclined bridge (see Fig. 1) converge to weighing funnels 10, which are installed on the supports of the bunker trestle 13 in the skip pit. Two weight watering cans are made of a trapezoidal shape for the purpose of placement in the existing dimensions and high-quality dust aspiration. They are equipped with suction of small fractions, closed chutes 11, laid under the track of the weigh wagon. Through the chutes, agglomerate, 65 pellets enter skips 12. The geometric capacity of bunkers A and B depends on the installation angles of the conveyors.

The invention "Bunker flyover of the blast furnace" is based on the task of constructing two bunkers (left A and right B) with a large capacity - 450 m each, two conveyors, two weighing hoppers, and two closed chutes in the ore yard without radical reconstruction, without stopping production - make screening of small fractions, automate the weighing and loading of agglomerate, pellets, significantly increase the service life of the weighing car, the entire bunker overpass, increase the reliability of the scheme of bulk loading into skips, maintainability, improve the working conditions of the equipment, labor, ecology.

Currently, blast furnaces are loaded with agglomerate with a content of fine fractions of 14-2095, pellets with a content of fine fractions of 4-695, the share of which in the iron ore part of the charge is 90-9595. It is known | see Blast furnaces "Coke consumption standards", governing document of the USSR Ministry of Education, Moscow: 1987. p. 10-12 table 1), that the decrease by 70 19Uy abs. of the content of small fractions (0...5 mm) in the charge reduces coke consumption by 0.595, increases productivity by 1956, while creating conditions for reducing coke consumption by increasing the consumption of fuel additives for blowing (pulverized coal fuel, natural gas, coke gas, fuel oil ).

Automatic loading of agglomerate and pellets by conveyors through stationary weighing hoppers, the error of which when weighing is 0.295, and weighing wagon - 0.595, reduces fluctuations in the composition of the charge by weight. Thus, reducing 75 the weighing error by 0.195 reduces coke consumption by 0.2895, increases productivity by 0.4295 (see Blast furnaces "Coke consumption norms, governing document of the USSR Ministry of Economic and Social Affairs, M: 1987, p. 8), increases the service life wagon-weigher, improves ecology in the bunker room.

The main geometric parameters of the bunker trestle device with the distribution of agglomerate and pellets at the ore yard and the combined loading of the charge into the skips, the ratio of which are the distinctive features shown on:

Fig. 1 - a general plan view is shown.

Fig. 2 - cross-section of the bunker trestle along the axis of the conveyor.

Fig. 3 - a section along A-A Fig. 2.

The bunker overpass consists of: the existing one according to the project, which includes (see Fig. 1) coke bunkers, two rows of Ha bunkers with drum shutters for limestone (fluxes), other additives and an emergency reserve of agglomerate, pellets located symmetrically to the axis of the carriage path scales; weighing wagon (see Fig. 2) for recruitment, weighing, and) transportation and loading of the charge into skips; two bunkers, left A, right B, with a capacity of 450 m each, each with a single sloping side 1, trestle supports 2, culverts 3, a reinforced concrete floor 4, a closed room with aspiration 5, dispensers 6, seeding mechanisms 7, two conveyors 8, two openings 9, two weighing cans 10; Ge) two closed chutes 11, two skips 12, located symmetrically to the axis of the inclined bridge.

The bunker overpass works as follows: when the supply is set, coke is loaded in the usual way according to the system -- loading; agglomerate and pellets unloaded into the left hopper A, the right hopper B, falling between the supports 2, (ee) estrus C, passing through the reinforced concrete floor 4 into the closed room 5, are sent to the screen 7 by dispensers 6, dispersed, technologically necessary fractions by conveyors 8 , through the slots 9, are transported to the 5 weighing funnels 10, which are equipped with the suction of small fractions during the set weight, then according to the system - loading through closed chutes 11, they are automatically loaded into the skips 12. Small fractions (0...5 mm) are delivered to the ore yard by conveyor 14 (see Fig. 3) with subsequent shipment to transport containers (cars, hoppers, etc.). Limestone and other additives are collected, weighed, transported and loaded into skips by weighing wagons. In emergency cases, cargo loading into skips is carried out autonomously, according to the design scheme entirely by weigh wagons or temporarily by conveyors. - s:z»

Claims (2)

The formula of the invention 1. Bunker overpass of a blast furnace, containing coke hoppers with screening mechanisms, hoppers for -I agglomerate, sinter and other impurities, drum shutters-feeders, overpass supports, cantilever beams, scale car for weighing and transporting the charge, which differs in that that two bunkers for agglomerate and io kotunov, left and right 450 m each? each, built into the unloading trestle of the ore yard from the side of the blast furnace (ee) symmetrically to the axis of the inclined bridge, and the upper parts of the one-slope side of each bunker cover -l 20 supports-consoles of the unloading railway track, the lower pyramidal part of each bunker passes through the reinforced concrete floor into the closed room , which is equipped with dust aspiration, the hoppers in the lower part of iChe) are equipped with vibratory feeders and mechanisms for screening small fractions. 2. Overpass according to claim 1, which differs in that the drive conveyors for transporting agglomerate and coal are installed at an angle of 162 to the horizon and perpendicular to the direction of movement of the weighing wagons, with the lower part they pass through the slots of the overpass supports into a closed room in the ore yard to the mechanisms o screening of bunkers, with their upper part they converge at an angle of 302 relative to the axis of the inclined bridge to the stationary weighing hoppers in the skip pit, the weighing hoppers have dust extractors and are equipped with closed chutes for o automatic loading of agglomerate and pellets into the skips. 60 b5