英文

The fifth chapter cooling equipment selection, air and iron design5.1 bottom cooling type selection5.1.1 water supply modeThere are two species of water: a hearth water temperature in lower case, use of hearth bottom cooling section of the drainage for use, this approach to check the furnace bottom water cooling tube inlet and outlet temperature will bring certain difficulty.Another is composed of a stove body water main water supply, apparently to increase water consumption, water consumption of furnace bottom for about 5% of total consumption.5.1.2 bottom pipe arrangement structureWater-cooled bottom: water-cooled bottom cooling intensity, low power consumption, soft water cooling, the cooling water pipe of φ 90 × 9, 36 in total. The bottom refra ctory brick masonry and the bottom surface of the base stone surface mounted between the water of seamless steel tubes, seamless steel pipe buried in the carbon ramming layer, water cooling pipe center line following the uses of 200mm refractory cement, or using 200mm carbon ramming material of furnace bottom water cooling tube spacing 200mm, 250mm. edge spacing5.2, each part of the blast furnace cooling equipment selection(1) bottom, hearth: using surface cooling wall cooling cooling wall is arranged on the furnace shell lining. Its advantages are: no damage to the furnace shell intensity, good sealing performance, uniform cooling, lining the surface smooth. Smooth cooling wall thickness of 100mm, width 1000mm, smooth cooling wall and the furnace shell with 20mm gap, with thin mud filled, smooth cooling wall and brick lining gap left between the 120mm, filled with carbon material.(2) the bosh, belly and: using brick-inlaid cooling wall, the thickness of 300mm, and waist parts with convex brick-inlaid cooling wall. The protruding part to support the brick furnace, extending the service life of furnace lining, when installed close to the bricklaying. And the furnace shell a distance of 130mm, intermediate filled with water granulated slag _ asbestos materials, the same section cooling wall between a vertical slit is 20mm, horizontal seam 30mm. intermediate fill with iron filings padding cooling wall is 1000mm in width, height is 2000mm,(3): tuyere small sleeve, by air in the sleeve and a large set of three sets of components. The tuyere small sleeve and the sleeve made of bronze, hollow structure, internal water cooling; big sleeve made of cast iron, cast inside a serpentine tube, water cooling water jacket. Three close contact, to prevent air leakage; extends into the hearth, hearth lining surface from 150mm.(4): using a cooling module, cancelled the lining and cooling stave, the cooling water tube are directly welded on a furnace casing, and pouring the heat-resistant concrete large cooling module5.5 iron mouthIron cover used to strengthen and protect the iron outlet of the furnace shell.Iron cover and the furnace shell adopts riveting, iron that has two kinds, one is oval, the other is a square.Iron cover is made of cast iron, the material for the 2G25The 5.6 shell and steel structure determination(1) a furnace body pillar:Design of the furnace body frame structure, the top frame of all of the load is made up of four pillars of the framework are passed directly to the furnace base, top flange on the load, the loading device and gas ascending pipe load is transferred to the foundation by the furnace shell, gas ascending pipe and the top platform is equipped with seat and the bracket. Cancel belly ring support pillar, hearth, a pillar.(2) top frame:Top frame of the upper part of the top pillar with across the beam will support are connected into a whole, and across the beam covered with patterned plate as the top platform. The top frame adopts the door-shaped structure, use 30mm thick steel plate welding.(3) the furnace shell: shell shape and type in the blast furnace, lining thickness, cooling equipment structure is adapted. The lower part of the hearth furnace shell turning point in the opening set, edge flanges above is not less than 100mm.Furnace shell thickness values and work conditions, the thickness of the segments as:The δ =KDType: δ _ calculation part of furnace shell thickness, mm.K_ coefficient, mm/m.Calculation of D_ parts of furnace shell diameter string band, M.Stack bottom belt height is generally not more than a height of the 1/4~1/3.5. furnace shell is generally composed of carbon steel or low alloy steel welding, a thickness greater than 10mm steel plate to shovel slope, vertical seam using "V" or "X" groove welding, transverse seam using "V" or "K" groove welds.(4) around the pipe and blast pipe:Bustle pipe adopts hanging, hanging on the cross beam, a furnace body frame spacing of 18mm. ensure the bustle pipe and pillar 250mm spacing.1) refractory cement, or using 200mm carbon ramming material of furnace bottom water cooling tube spacing 200mm, 250mm. edge spacing2): from small sets, tuyere tuyere in the sleeve and a large set of three sets of components. The tuyere small sleeve and the sleeve made of bronze, hollow structure, internal water cooling; big sleeve made of cast iron, cast inside a serpentine tube, water cooling water jacket. Three close contact, to prevent leakage; air inlet extends into the furnace cylinder, from the hearth surface 150mm.(5) furnace throat protection boardFurnace throat by burden of falls of the impact, so the protection by metal plate protection, also known as the furnace throat steel monly used steel brick has two kinds, namely the massive brick and steel strip steel brick.The massive steel tile hanging plate and steel brick of connecting bolt in production are often subjected to high temperature and deformation, dislocation and loss caused by steel brick.Strip steel brick use effect is good, the big and medium sized blast furnace uses this form. Chapter sixth material systemThe modern blast furnace raw material system requirements:①assures continuous, balanced supply in blast furnace smelting of raw materials required, and for further strengthening smelting leave adequate leeway.In the process of storage and transportation should be considered in order to improve blast furnace smelting to processing steps, such as mixing, crushing, sieving classification.Coke during transport to minimize breakage rate.③should try to realize automation and mechanization, improving blending, batching, weighing accuracy.The material system of each transport links and leakage points are the generation of dust, should be considered in the design of adequate ventilation dedusting facilities.6.1 mine storage tank and a coke tank design6.1.1 ore storage tank design(1) the role of ore storage tank:①on the original fuel reserves.②is conducive to the realization of ingredients such as job of mechanization and automation.(2) ore tank design①ore tank total length is determined by the length of the workshop, decided to blast the centerline distance.Single trough length with ditch transport form, using belt conveyor is generally 5m; when weighing car, with the locking device in the form of length should be determined.From the 5 m②mine groove width depends on the blast furnace volume and groove groove of transport rge and medium-sized blast furnace is generally 10~11m.When the slot by slot train, by weighing car transport, general into a double-row ore tank.When the groove groove adopts belt transport, are generally made of single row.From the 11 m③mine groove height depends on mine slot in the upper forms of transport.When the train transport, railway slope by limit ('0.015', the general track surface elevation of 9~10m, such as mine groove with the upper part of the tape transport, ore groove surface can be higher.From the 10 m(3) the design of 10 ore storage groove, groove groove by a belt conveyor.①take mine storage tank total volume to total volume 1.6 times, then mine storage tank capacity:V slot =1.6Vu=1.6 × 1629=2606m3②each ore storage tank volume: V mine =2606/10=260.6 m3, 261 m3.③ore tank storage capacity for 12~18 hours.6.1.2 side ore tank(1) the mixed ore tanks: 75 m3 × 2(2) ore block groove: 100 m3 × 26.1.3 storing coke tank design(1) 2 storing coke tank, storage capacity for 6~8 hours.(2) /Vu=0.6 V coke is coke chute, the total volume of:V =0.6 × 1629=977.4 m3 coke(3) each coke tank volume: 977.4/2=488.7 m3, 489 m3.(4) in addition to a 100m3 char groove.6.1.4 mine groove structure(1) the design of mine storage tank bottom wall and a peripheral wall with reinforced concrete to irrigate and into, in order to prevent wear and high temperature (hot sinter) damage, should rely on ore coke wall lining a layer of clay brick.(2) the design of ore storage groove is arranged into a single row.Method for belt conveyer, width of 11m.Ore storage tank height is 10m, ore storage groove width in the groove under a tape machine for the 5m, trough wall inclination of 54 °.6.2 feeder trough, screening and weighing design6.2.1 feederThe design of the use of electromagnetic vibration feeder.Main tank, shock, shock absorber is composed of three parts.The vibrator and the groove spring connected together, ore, mixed ore are located under the trough vibration feeder.Slot under the anti feeding valve, electric apparatus, but also set up a manual device.6.2.2 slot screenGroove screening is in before entering furnace charge last screening, its purpose is to further screen in addition to charge powder, in order to improve furnace charge column permeability.The feeder floor plate for screen, feeding and playing the role of screening.6.2.3 tank weighingThe design of the use of electronic weighing hopper.(1) coke weighing hopperThe main installation in the coke chute below for weighing after the screening coke, then the coke is discharged into the tape feeding machine for blast furnace.(2) ore weighing hopperThe main installation in the coke chute below, through the funnel and gate after sieving ore discharging into the tape machine.Ore using dispersing sieve powder dispersion weighing, charging the tape machine to the weighing room, by the concentration of the funnel to the feeding belt machine for blast furnace.(3) weighing hopper process requirements:To prevent inner material hopper, hopper and left chute soleplate and the side wall of the intersection and the level of actual angle should be greater than 45 degrees.The weighing hopper which size should be concerned with the device is adapted to.③is arranged in the tape machine on the weighing hopper discharge outlet and a chute with belt conveyor width adapted to discharge the material, to prevent splashing tape machine in lateral.6.3 belt feeder capacity(1) the design of the belt feeder inclination of 12.5 °, 1.2m wide.(2) measures: feeding machine with two driving, continuous operation; generally set three motors, two run a reserve; for the prevention of furnace top temperature, in the charging device is provided with a water spraying device is provided with adhesive tape; observation of crawling device, prevention belt fracture apparatus and prevention of shutdown when accidental starting equipment.The seventh chapter of sending wind system of blast furnaceBlast furnace blast system includes blower, wind pipe, hot air furnace, hot air pipeline and the pipeline of the various valves. The accurate selection of air blower system, reasonable layout of piping system, valves, reliable work, hot blast stove high work efficiency, low consumption, high quality is the guarantee of blast furnace, high yield is one of the important factors.7.1 blast furnace blower selectionOn the requirements of the blower of blast furnace smelting:(1) have sufficient air supply ability. That can not only provide the blast furnace smelting required air quantity, and the outlet of the blower pressure must be sufficient to overcome the resistance loss of air supply system, blast furnace column resistance loss and the guarantee of top gas pressure is high enough, the largest volume of blast blower should be able to meet summer smelting intensity of blast furnace requirements; winter should be able to work in economic region.(2) the air flow of the fan and the pressure to have a wide adjusting range.The fan air volume and pressure should be applied to the furnace condition direct and to reduce the strength and improve, smelting, jet fuel with oxygen enriched blast operation and other factors change.The high top pressure blast furnace smelting, should be considered in the feasibility and rationality of atmospheric pressure.(3) uniform wind sending and stable.The wind pressure, air may be automatically generated substantial change.(4) can guarantee the long time continuous, safe and efficient operation.7.1.1 blast furnace volumeFurnace furnace volume:V0=VuIv/1440=1629 × 0.95 × 2700/1440=2901.6m3/minType: V0 - standard air into the furnace, m3/min.Vu - blast volume, m3.I blast furnace smelting strength, t/ (m3.d).V - dry coke consumption volume, m3/t, 2700.7.1.2 blower airV= (1+R) V0= (1+10%) × 2901.6=3191.7m3/minType: V - standard air outlet of the blower, m3/min.R - air leakage coefficient,%, the design of blast furnace 10%.7.1.3 blower outlet pressure calculationP=Pt+ Δ PLS+ Δ PFS= (1.5+1.3+0.2) × 105=3.0 × 105 PaType: P - blower outlet pressure, PaPt - blast furnace top pressure, Pa, 1.5 × 105 PaΔPLS blast furnace material column resistance loss, Pa, 1.3 × 105 PaThe Δ PFS - sending wind system of the blast furnace resistance loss, Pa, 0.2 × 105 PaThe design of the use of axial flow fan.(1) to the outlet of the blower air correction:Correction coefficient: K=0.92;Wind pressure coefficient of correction: K ′=1.04;Actual quantity: V ′=V/K=3191.7/0.92=3469(2) to the outlet of the blower pressure correction:P ′=P/K ′=3.0 ×105 /1.04=2.88 ×105 Pa(3) the selection of fanFan type: Z - 3250 - 46V olume: 3250 m3/minAir pressure: 3.2kg/cm2Speed: 4400rad/minTransmission: ElectricPower: 12000KWTwo blast furnace of installation three, a backup.7.2 blast furnace design7.2.1 hot air furnace forms the basic structureThe basic structure of the form of hot blast stove of internal combustion type, external combustion type and top combustion type hot air furnace three.This design uses the improved internal combustion type hot air furnace.Internal combustion type hot air furnace lining, a combustion chamber, a heat accumulating chamber, a furnace shell, afurnace grate, pillar, pipes and valves and other components.The combustion chamber and the accumulator chamber built in the same furnace shell, a furnace wall is built between.Gas and air by the pipeline through a valve into the combustion chamber and the flue gas is burned in the combustion chamber, the upward movement of the vault to change direction, downwardly into the regenerator.Checker brick regenerator by composition, checker brick supporting in the furnace grate and the support.Flue gas heating and cooling the checker brick itself, through the grate below the flue valve into the flue gas discharged into the atmosphere through chimney.Checker brick is heated and storing some heat, hot air furnace stops burning, into the air, cold air from the lower air ducts and air valve into the chamber, the air through the lattice brick is heated, the vault into the combustion chamber, and the hot blast valve into the hot blast pipeline into blast furnace.7.2.2 hot-air furnace body design2620 m3 blast furnace hot blast stove designBlast furnace volume 2620 m3, equipped with four blast furnace.1 identify the basic parameters:(1) unit of furnace volume heat storage area of 90m2/ m3;(2) to determine the blast furnace steel shell bottom diameter φ 10000 mm, shell and arch plate thickness of 20mm, the top plate thickness of 36 mm;2 determine the furnace wall structure and hot air furnace inner diameter:Lower part.(1) wall thickness of 345 mm, high alumina brick;(2) 113 mm insulation bricks, diatomite brick, close to the furnace shell;(3) 60mm filler layer, water residue - asbestos packing layer;(4) 40 mm unshaped refractory coating.Total 345+113+60+40=558 mm.(5) blast furnace inner diameter:D =10000-558 × 2=8884 m mWell wall structure:Upper: 230 high aluminum brick +345 high aluminum brick +20 sliding jointLower: 230 high aluminum brick +345 high aluminum brick +20 sliding jointNote: the upper part of the high-alumina is lower more resistant to high temperature.3 well area (including the wall):According to the experience of selected well area occupies area of 25% hot air furnace.(1) hot blast furnace area:S = the /4 ㎡(2) well area:Well s = s ×25%=61.988 ×25%=15.497 ㎡The 4 regenerator section area:S = s s storage well =76.689 19.172=46.491 ㎡5 choose checker brick:Choose the 7 hole brick, hole diameter 43 mm, look-up table to know: 1 m3 lattice brick heating area of 38.06 ㎡/ m3.The 6 regenerator heating area:(1) four blast furnace heat storage area: 1629 ×90=146610 ㎡(2) a hot-air furnace heat storage area: 146610 ÷4=36652.5 ㎡7.1 m high regenerator area:1 x 46.491 x 38.06=1739.447 ㎡The 8 regenerator height:H storage = a hot-air furnace heat storage area of /1 m high regenerator area =3665。