RH furnace uses fireproof material service life

RH fine full name takes off gas fine law circularly for RH vacuum. 1959 by German invention, among them the first letter that RH is two manufacturer that Germany uses RH fine technology at that time.

Fine is move the molten steel of the Chu Lian in converter, electric stove to have refined process in another reactor, also weigh fine 2 times.

 

The steel-making method cent the tradition is two paces, namely Chu Lian + fine. Chu Lian- - the fused, dephosphorization that has furnace charge below oxidisability atmosphere, decarbonization and alloy are changed. Fine- - deep decarbonization undertakes below vacuum, inert gase or the condition that accuse atmosphere, go gas, to oxigenate, go field trash and processing of field trash denaturation, adjust composition, temperature of control molten steel, optimize craft and product structure, development thereby product of high additional cost, energy-saving fall bad news, reduce cost to increase economic benefits.

 

Technology of RH vacuum fine develops the history

 

Traceable of technology of RH vacuum fine 50 time, company of heart of A Er shellfish applied for fine of molten steel vacuum to take off the technical patent of air standard 1957, this is vacuum those who take off the development that enrage a law is germinant

 

Company of German Lai mattress and conspicuous pulled Wu Sizhen 1958 collaboration of empty pump factory undertook industrial sex produces a test successfully, obtained delectable processing result,

 

1959 RH of denominate of German metallurgy association

 

Japanese development is most rapid, new day iron invented RH-OB method 1972, can have the operation that warms up to aluminium

 

80-90 time, japanese plain Qi invented RH-KTB, came true 2 times to burn to use gush carrying a gun on the head to play desulphurization agent with the decarbonization that blow oxygen and KPB(MFB) . Its play the function of oxygen decarbonization, make produce those who give carbolic ≦ 20ppm to exceed mild steel

 

RH development of China begins later in 90 time, at present general medium, large steelworks configures furnace having RH

 

Wait for processing ladle to wrap stage car to go up to RH steel by swing of drive a vehicle, car of steel bag stage leaves to be located in the processing position of vacuum chamfer lower part, by decide artificially height of steel fluid face, subsequently the top rises steel to wrap stage car to come book height.

 

- undertake measuring the operation such as lukewarm, sampling, calm oxygen.

 

- steel rents a car to be supported to rise again by hydraulic pressure crock, provide the macerate of vacuum chamfer immerge molten steel and arrive booked deepness. Meanwhile, ascendant macerate canal is enraged with booked discharge inbreathe argon. Provide juice of complete immerge steel as macerate, vavuum pump is started.

 

- basis of various vavuum pump beforehand the bleed curve of set has the job.

 

- vacuum dehydrogenation processing: In formulary time and formulary low pressure the condition falls to undertake be takinged off circularly enraging operating continuously, in order to reach the target value of dehydrogenation.

 

- vacuum decarbonization handles (low carbon or exceed) of molten steel of low carbon grade: It is certain to take off gas to will last circularly the target with achieving decarbonization is worth time. In decarbonization process, the carbon in molten steel and oxygen reaction form carbon monoxide and pass vavuum pump eduction. If steel is medium oxygen content is insufficient, can supply oxygen through carrying a gun on the head to blow oxygen. When decarbonization ends, molten steel undertakes deoxidization through adding aluminium.

 

- after molten steel to oxigenate, alloy makings joins vacuum chamfer through vacuum hopper.

 

- undertake measuring lukewarm, calm oxygen and affirmatory and chemical component to molten steel.

 

- steel water treatment ends, vavuum pump system is ordinal shut, vacuum chamfer answer pressure, be in atmosphere condition afresh, steel wraps stage car to drop to go up to orbit.

 

- ascendant canal is automatically by the switch that blow argon blow nitrogen.

 

- car of steel bag stage leaves to add heat preservation agent to be versed in, blow argon to feed silk and throw heat preservation agent.

 

- car of steel bag stage opens condole to wrap. Travel handlebar steel wraps swing to include circumgyrate station greatly to Lian Zhu.

 

Reaction of molten steel metallurgy has inside the vacuum chamfer that there is fireproof line in build by laying bricks or stones. The bottom of vacuum chamfer is two macerate valves that take fireproof line, one is ascendant canal, one is in charge of to drop. As a result of ascendant canal argon of inbreathe of fluid of ceaseless Xiang Gang is enraged, relative to the fall that did not blow argon the canal produced taller static press difference, make molten steel is entered from ascendant canal drop through flow direction of vacuum chamfer bottom canal, so ceaseless loop relapses

 

Basically wrap stage car, steel to wrap Bao Sheng of spiral lifting device, steel to fall by steel hydraulic pressure stands. Steel wraps stage roof to rise device to drive a top to rise frame top through hydraulic pressure crock, can include steel steel of stage car along with to wrap integral top to rise, in making canal of vacuum chamfer macerate inserts steel to wrap, undertake handling.

 

The top rises frame installation to be inside the hole that handles a lower part. Litre fall frame edge slideway is perpendicular motion, by drive of hydraulic pressure crock. The top rises frame to set oriented plant, ensure steel rents a car can reliable fall on orbit

 

Adoption vacuumize device is main vapour jet centrifugal pump, jet centrifugal pump is connect by working nozzle and diffuser and mixing chamber and comprise. In this special conduit, vapour enters the mouth to diffuser through the exit of nozzle this area between (mixing chamber) , because vapour flows,be in high speed and appear area of a negative pressure. Right now, by mixing chamber of bleed body engulf, working vapour mixes each other with the gas that be smoked and exchange into travel energy, can transform working vapour by pressure the kinetic energy that come is passed by bleed body. Jet centrifugal pump has multipolar pump series connection to pursue the vavuum pump system that class is compressed and forms.

   

Material of liner of RH of foreign part country is qualitative with life:

 

The factory is fastened	Vacuum room Capacity / T	Vacuum room	Ascendant canal	Drop canal	Life / second
					Vacuum room	Ascendant canal	Drop canal
New day iron factory of 8 long narrow flag	150	Be united in wedlock directly Magnesian chromic brick	Tall aluminous brick	Tall aluminous brick	432	200	200
Factory of island of plain Qi water	160	Magnesian chromic brick			1000
German the base of a fruit dark company	150	Magnesian chromic brick			Wall 1050 Bottom 550	150	300

Commonly used and fireproof material has RH stove: Combine magnesian chromic brick directly, tall aluminous brick, magnesian chromic brick.