The application of core of water-cooling furnace lid on furnace of 5t electric arc

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Furnace lid of furnace of water-cooling electric arc [summary] the article is brief the main problem that introduced existence of aborning of furnace lid of furnace of traditional electric arc, summed up the experience that apply on furnace of 5t electric arc and improves technology of local water-cooling furnace lid, say palpability uses the apparent effect that this technology place obtains. My factory is major of cast of frog of tall manganese steel one of manufacturers that decide a dot, produce per year a quantity 5000 more than T, use heat of electric arc of a 5t one controls production, annual steel-making in all 800 furnace left and right sides. Because be located in northeast, be deceived awaits a condition to restrict, all cast production will be finished November in annual 3 ～ normally, this lives to must not stop furnace with respect to the requirement inside effective working hours. And one of conditions that make sure electric stove moves normally carry lining in order namely. Furnace lid is a of lining main component, its work requirement is very abominable, the regular job status that assures furnace lid is one of keys that ensure electric stove moves normally. Accordingly, we improve aspirant travel in the applied money ¨ of furnace lid ceaseless experiment, the key is to applying respect of core of water-cooling furnace lid to consider to fumble gave more successful experience, obtained favorable result in producing practice. One, the application before improving asks when current situation furnace lid is long in smelt process be in high temperature condition, especially deoxidizing stage blocking stage, as a result of the reflex of slag, furnace lid temperature is highest can amount to 1800 ℃ . Furnace lid returns the function that often is heated up coldly, urgently urgently, temperature of the furnace lid after tapping drops quickly 1000 ℃ are the following, need makings, charge time sometimes longer, temperature drops more, make craze of furnace lid generation is mixed very easily flake. Additional, the furnace lid in smelt process still is reached soot to wait to erode and erode by vital energy of high temperature heat, slag. In addition, still have furnace lid promotion, drop to be moved with furnace bend, and the mechanical vibration when bath is boiling, all make furnace lid produces breakdown easily, lower its service life, those who affect electric stove is normal move. To prolong the service life of furnace lid, we ever took the fireproof stuff that improves build by laying bricks or stones to build furnace lid to use, raise build by laying bricks or stones to build mass, the aperture between contractible brick and brick, and the arch that raises furnace lid is spent (add the space that bath goes to in the center of furnace lid namely) wait for measure, but the effect is not quite big, often still produce furnace lid to drop change brick, often the problem such as furnace lid. The meeting after furnace lid brick falls into bath affects slagging badly to operate; Change furnace lid increases hot loss to reduce manufacturing efficiency again already, raise maintenance cost. According to statistic, before improving average and annual the time stopping furnace that create makes an appointment with 45h, influence steel-making furnace second 15 furnace, the pecuniary loss that causes every year from this amounts to 300 thousand yuan of above. And because furnace lid drops a brick,affect slagging and be opposite further the harm of quality of steel fluid fusion more hard estimation. 2, preliminary improve 1.

The application of technology of local water-cooling furnace lid tries to be below the circumstance that does not have better fireproof stuff and measure, how to improve the service life of furnace lid and manufacturing efficiency, reduce Mao of fireproof material disappear and power consumption, raise steel fluid quality to become a factory to be badly in need of settlement difficult problem. The basis produces actual condition, we are bold technology of furnace lid of water-cooling of attempt end ministry, encircle besides water-cooling furnace lid namely outside, stayed in furnace lid center to install core of water-cooling furnace lid partly, 3 electrode hole is opened among, make 3 electrode rise inside its fall, step of high aluminous refractory products still is used between furnace lid core and furnace decorative cover make. This kind of structure and appearance of traditional substance of fireproof material build by laying bricks or stones are compared, although the service life of furnace lid has rise, but the effect is insufficient and special apparent. 2.

The problem of existence and case study are preliminary after investment of improved water-cooling furnace lid uses a level, our discovery should produce slack phenomenon every months a few times, and generation is out of shape, bring about stop furnace filling solder or change (serious when) , still affected production on certain level. Especially once cooling water enters bath, can add content of the gas in steel, what the gas experience in cast destroys a metal to organize is successional, accept business the mechanical performance that affects product of frog of tall manganese steel and service life. Accordingly, must do on the foundation here further improve. Classics author observes research repeatedly, discovered slack with metabolic main reason is as follows: (The cooling means of core of 1) furnace lid is unreasonable, although press the position of electrode aperture to divide furnace lid core into 3 cooling zone region, but because use tigidity or soft join to establish ties these 3 area,rise, form the cooling kind that takes, cool on one hand the effect is not ideal, make furnace lid is out of shape easily; On the other hand each connect and pipeline are near electrode travelling expenses of high temperature area, till very incidental strike a light, craze is slack, see a picture 1. (2) solders quality is poorer, bleb of welding line existence, be mingled with, not solder is appeared wait for blemish, and the pressure when hydraulic test having before installation slants small (0.

7MPa) , dwell time is short (5min) , sometimes even without hydraulic experiment, put in leak hidden trouble. (When 3) build by laying bricks or stones makes furnace lid, furnace lid core and mouth of water-cooling furnace decorative cover and electrode and Kong Ping of furnace lid core spend difference all right, electrode is in drop strike a light is contacted with core of water-cooling furnace lid in the process, cause slack. (On core of 4) water-cooling furnace lid not clean, dirt retention and oxidation iron sheet (pink) more, affect already medicinal powder hot easy cause strike a light, cause slack. (5) makes the plate thickness of furnace lid core be 10mm, stiffness, intensity all small sufficient, cause be out of shape. Water-cooling furnace lid 3, improve measure 1.

Improve means of cooling water loop to enter the malady of means of a loop in the light of original cooling water, every independence of instead of cooling zone region cools circulatory system, be about to top part sets temperature for cooling water water inlet, circulate inside this area one week later alone eduction. The cooling means after improving prevented furnace lid to be out of shape, and contact is far from electric transverse arm and area of electrode high temperature, avoided strike a light and slack happening. This kind of means is more than original structure two wirereinforced suction hose give conduit with two, detailed sees a picture 2. 2.

Measure of form a complete set (1) makes furnace lid core with solder of armor plate of 14mm thick boiler, press construction of design technology requirement strictly, strengthen solder quality dogs examination, ensure solder quality accords with a standard. (Before 2) build by laying bricks or stones makes furnace lid, need to have hydraulic test strictly to core of water-cooling furnace lid, pressure ≥ 1MPa, time ≥ 60min. (3) uses gradienter the loose tool that corrective build by laying bricks or stones makes furnace lid use, ensure core of water-cooling furnace lid and furnace lid water-cooling encircle buccal parallelism. (4) adjusts electrode to grasp hold implement transverse arm and collet, ensure electrode is perpendicular litre fall. (So that wear a well,the upside when 5) feed a machine must install some of little material, in making electric arc buries a person to expect as soon as possible, lest arc makes furnace lid local overheat and attaint. (6) blows the dirt retention that buckles furnace lid to go up and oxidation iron sheet regularly (powdery) . (7) keeps clear of in time inside circular cistern sundry, maintain water quality buy clean, add screen pack in circular water water inlet. (The use time that core of 8) demarcate furnace lid gives, change regularly, namely every 280 furnace second junior dry Chu changes. 4, applied effect uses core of water-cooling furnace lid through be being installed on furnace of 5t electric arc, perfect via ceaseless improvement, obtained favorable applied result, main effect was produced in production of cast of frog of tall manganese steel, brought better economic benefits to the enterprise. (1) reduced what all sorts of breakdown cause former furnace lid to stop furnace, maintenance to reach greatly change the frequency of furnace lid, annual but much steel-making 15 furnace, achieve beneficial result more more than yuan 30, and better to enlarged production to create condition. (2) reduced the maintenance cost of equipment significantly, save furnace lid firebrick every year 30 more than T, reduced labor intensity of the worker greatly at the same time. (3) can use operation length arc, every furnace steel shortens fusion time 35min, h of · of 200kw of report of every furnace section, annual section report H of · of 160 thousand Kw. (Because 4) happens scarcely slack, ab extra gas decreases greatly in steel, an all sorts of slag can be built to satisfy craft requirement conveniently in the operation, improved product quality effectively. CNC Milling