CN2119629U - Electrothermic tube heating type galvanized pot - Google Patents

Abstract

The utility model provides an electrothermic tube heating type galvanized pot for heat galvanized production of steel tubes (or steel products). The body of the utility model is mainly made of fire-resistant thermal insulation materials, and the inside of the body of the utility model is provided with a row alloy heating tubes, the alloy heating tubes can endure the corrosion of liquid state zinc and can be used as a heat source for the heat galvanized production. The alloy heating tubes in the utility model can melt zinc pigs and make the temperature of zinc liquid satisfy the process requirement of the heat galvanized production. The utility model makes up for the shortcomings that the existing steel galvanized pot has short service life, and the existing induction heating type galvanized pot has low thermal efficiency and high cost, having the advantages of long service life, low cost, high thermal efficiency, low failure rate, simple structure, easy control, etc.

Description

Electrothermic tube heating type galvanized pot

The utility model belongs to the molten zinc hot dip equipment in a kind of steel pipe (or steel product) galvanizing production, is specifically related to a kind of electrothermal tube heated type galvanized pot.It is applicable to hot dip steel pipe and other ferrous materials or goods.

At present, the galvanized pot that uses in the steel tube hot galvanizing production can be divided into two kinds of metal pan and nonmetal pots by manufacturing material.Metal pan generally by low carbon steel plate or technical pure iron plate weldering system, then manufactured by refractory material by nonmetal pot.The mode of heating that galvanized pot adopted generally is divided into fuel (coal, coke, oils, natural gas and coal gas etc.) heating and electrical heating (comprising resistance heated and eddy-current heating) two classes.

For the metal galvanized pot, no matter be fuel heating or resistance heated, all be the pot body to be heated from the pot outside, conduct with the zinc liquid in the heat transferred pot, for zinc-plated usefulness by the heat of pot wall.This galvanized pot is simple in structure, thermal efficiency height, and the producer that has is still using.But owing to contain elements such as silicon, carbon in the iron and steel, they impel the continuous and pot body generation diffusion of zinc of fusion, and this has just quickened fusion and the etch of liquid Zn to the zinc pot.Its result has not only produced a large amount of cadmias, the zinc consumption is increased, and form defective in various degree on the pot body, makes pot body intensity reduce greatly, and part or integral body deform.At this moment, do not damage, have to stop production yet,, more renew the zinc pot to scrap the old zinc pot that to repair even the zinc pot also.Otherwise, use as continuing, may leak serious accidents such as zinc, blast.This metallic zinc pot of manufacturing with steel plate requires very high qualitatively in the weldering system, when defective such as lack of penetration, bubble or slag inclusion was arranged as weld seam, the zinc pot will damage rapidly.Generally speaking, for a high-quality metal galvanized pot, its accumulative total also has only about 5000 hours service life.As of low quality, improper use, may have only one or two months the service life of a metallic zinc pot.As seen, the service life of steel zinc pot, weak point was its outstanding shortcoming.Moreover, the replacing galvanized pot still bothers very much, and great in constructing amount, and the material amount of expending is also very big.Such as, manufacture a steel plate zinc pot that holds 100 tons of zinc amounts, approximately need 40 tons of steel and more than 600 kilogram of welding rod.This shows that this zinc pot is dissatisfactory.

Nonmetal galvanized pot is built by laying bricks or stones with refractory material, and zinc liquid with refractory material chemical reaction does not take place, and therefore, this zinc pot life-span is longer.But very poor because of the refractory material thermal conductivity, can not outside pot, heat with fuel or resistance wire in the face of the zinc pot, so this zinc pot mostly is the method that adopts eddy-current heating, this method has promptly reduced cadmia, can make zinc liquid temperature be easy to control again.Because this zinc pot advantage is more, be widely used at present producing.But this galvanized pot also has the deficiency of himself, such as: inductor is used a lot (generally using 12), and this makes that equipment is complicated and just build investment very big.Feed intake at first when producing, can not directly rise moltenly, and temperature rise speed slowly (approximately needs 5～7).But the more important thing is: when the inductor oepration at full load, its thermal energy conversion rate too low (50%).Owing to grow (1.2 meters), the not very big again (450 * 110mm in channel cross section by channel to the distance of zinc pot inwall from inductor time utmost point zinc ring ²), this makes heat transfer efficiency descend greatly, the thermal efficiency has only 80%.Like this, the actual energy that obtains of zinc pot is only supplied with 40%(50% * 80% of inductor energy for power supply).As seen, there is the electric energy of 60% preciousness to be slatterned in vain here.This is a fatal weakness of the nonmetal galvanized pot of induction heating type.In addition, also be very big to the maintenance load of inductor time utmost point zinc ring aborning.For example, the seat clay confining bed around the zinc ring is very thin, is inductor and a weak link of pot body connection place, as safeguards improperly, and the zinc phenomenon very easily takes place to leak.Sometimes, also can block because of things such as impurity, cadmia are arranged in the channel, cause by the zinc liquid convection current of channel conduction heat not smooth, the heat that inferior utmost point zinc ring produces can not in time be exported, make accumulated temperature too high, on the zinc ring, produce zinc fume and abscission ring takes place or channel confining bed cracking and the outer steel panel of zinc ring are deformed because of crossing thermal expansion.At this moment, inductor is cisco unity malfunction just, and therefore zinc pot temperature descends, and makes to produce to be subjected to direct influence.

The purpose of this utility model is that a kind of improved electrothermal tube heated type galvanized pot that galvanizing is produced that is used for will be provided.It will remedy the short and low deficiency of the induction heating type galvanized pot thermal efficiency of steel galvanized pot life-span, have simple in structurely, and cost is low, thermal efficiency height, and the life-span is long, controls easily, and fault is characteristics such as less.

The utility model is realized by following conceptual design.

The refractory brick that the refractory concrete that the galvanized pot body is poured into a mould by outermost layer, the insulating refractory soil that make firm by ramming in the middle level and nexine are built by laying bricks or stones etc. constitutes.The level of growing limits in its two respectively reserves row's open-work to the middle part, respectively crosses an electrothermal tube as the galvanizing thermal source in each two symmetrical holes.The outer wall of this electrothermal tube adopts the compo pipe (or technical pure iron pipe) of tolerance of liquid zinc dissolving, etch to manufacture.Slit between electrothermal tube and the pot body preformed hole is with the stifled tight compacting of seat clay (or pour into castable refractory), so that leakage fix and is stopped to electrothermal tube.

Because positions such as pot inwall that contacts with zinc liquid in this zinc pot and electrothermal tube all have corrosion resistance, so long service life.Because the mode of heating that this galvanized pot adopts belongs to pure resistance directly heats, so power factor height (COS ∮=1), heat-energy losses is few again.

Concrete structure of the present utility model is incited somebody to action with the following Examples and accompanying drawing is further described:

Fig. 1 is a pot body stereogram of the present utility model.

Fig. 2 is a horizontal sectional side elevation of the present utility model.

Fig. 3 is electrothermal tube local structure figure of the present utility model.

This galvanized pot mainly is made up of two parts, i.e. groove-shaped pan body and row's metal electric heating pipe.

Be described as follows with reference to Fig. 2 and Fig. 3:

The pot body case (1) of galvanized pot is formed by refractory concrete cast, and this shell good integrity has the effect of supports, protection pot body and insulation.For making pot body more firm, in its arranged outside two rows and the reinforcements (2) of housing (1) one.In order to prevent zinc liquid to exosmosis and increase bulk strength,, be equipped with uniform grasp (4) at steel plate two sides balanced welding at the multiple one deck sheet metal (3) of the inboard lining of pot body case (1).In sheet metal (3) inboard is the refractory insulating layer (5) of making moulding with insulating refractory soil firm by ramming, and the inside is the inner liner (6) of building by laying bricks or stones with refractory brick, and its (6) has higher mechanical strength, and anti-Zn solution washes away and collides, and can protect a pot body inboard.In the two row poling holes (7) that pot body both sides symmetry is reserved, cross the electrothermal tube (8) of a row as zinc-plated thermal source.Castable refractory also can be poured into the stifled tight compacting of seat clay in long and narrow slit between electrothermal tube (8) and poling hole (7) in this seam, leak from here so that electrothermal tube is fixed and stops zinc liquid.Respectively there is a clam member with the metal of threaded engagement (13) termination of electrothermal tube, and pressing plate (13) the inside is heat-resisting sealing gasket (12), and this can make electrothermal tube tightr with combining of pot body.The tube wall of these electrothermal tubes (8) all adopts tolerance of liquid zinc fusion in the zinc pot, and the compo pipe of etch (or technical pure iron pipe) is made, and they can work long hours in zinc liquid and not fragile.Electrothermal tube (8) liner is established one deck electrotechnical ceramics pipe (or the good hot-face insulation pipe of other thermal conductivity) (9), is laid with heating wire (10) in the earthenware (9), and heating wire (10) is associated in thicker electrode (16) weldering.Electrode (16) has porcelain lining (11) to be fixed on every side, the exit of electrode (16) has ceramic liner pad (15) to make insulant, the outside of its (15) is exactly the closed end cap (14) of electrothermal tube, and this end cap is a metallic article that has screw thread to cooperate with electrothermal tube.

The use of this galvanized pot is such: when feeding intake, tamp being paved with below the electrothermal tube of zinc ingot metal in pot earlier, repave with electrothermal tube and flush.Then, more a small amount of lead pig (adopting the hot dip of plumbous zinc method) pendulum (directly be not pressed on the pipe) above the electrothermal tube.At this moment, promptly available low-voltage send electric rising to melt.Lead pig fusing along with the electrothermal tube top continues to add lead pig.To the plumbous zinc mixed liquor of fusing when flooding electrothermal tube, can boosted voltage, add material in a large number in the plumbous zinc ratio of technological requirement, till reaching the standard of feeding intake.Can heat up this moment to be plated.Satisfying under the prerequisite of production technology, zinc liquid temperature can adopt manual control, also can adopt the automatic control of temperature sensor, and this all is easy to realize.

Galvanized pot provided by the utility model is compared with original metallic zinc pot, and it is strong to have rigidity, indeformable, high temperature resistant, corrosion-resistant, and it is few to produce slag, and the zinc consumption is low, good heat insulating, the advantages such as long service life. Because the design has adopted ohmic electrothermal tube directly to heat, this compares the nonmetal zinc pot of it and existing induction heating type, has the power factor height, thermal efficiency height, and equipment is simple, and is cheap, and weak link is few, and failure rate is low is safeguarded the advantages such as workload is few.

This kind galvanized pot can directly rise molten, safe and reliable to operation fast, and energy-saving effect is remarkable, and the control temperature is easy, implements feasible.

Claims (3)

1, a kind of metal electric heating pipe that with the refractory material is main material is made pot body and tolerance of liquid zinc corrode is made the electrothermal tube heated type galvanized pot that thermal source is formed, and it is characterized in that seeing through a pot wall in the galvanized pot level to the middle part, crosses row's electrothermal tube.

2, galvanized pot according to claim 1, it is characterized in that pot body by the outside be provided with refractory concrete shell, the lining of reinforcement multiple inside the shell the antiseepage steel plate, with seat clay make firm by ramming the refractory insulating layer of moulding and the inside inner liner of building by laying bricks or stones with refractory brick constitute.

3, galvanized pot according to claim 1 is characterized in that tube wall, the electrotechnical ceramics pipe (or the good hot-face insulation pipe of other thermal conductivity) of liner and the formations such as heating wire that lay the inside that electric heating tube is made by the compo pipe (or technical pure iron pipe) of tolerance of liquid zinc fusion.