Heating furnace and heating method for galvanizing continuous annealing zinc pot, zinc pot and crucible

Abstract

The heating furnace comprises a furnace platform, an outer cover, a plurality of inner covers and a furnace plate, the outer cover and the inner covers are arranged on the furnace platform, the inner covers are arranged in an inner cavity of the outer cover, the furnace plate is arranged on the furnace platform, a carrying plate is arranged on the furnace plate, a steel coil is placed on the carrying plate, and the steel coil is arranged on the carrying plate. According to the silicon steel coil heating furnace, the requirement for uniform heating of a steel coil can be met, the heating efficiency of the silicon steel coil can be improved, meanwhile, the furnace plate is convenient to replace, and the service life is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of steel, titanium public auxiliaries and nonferrous metallurgy, and specifically to a heating furnace and a heating method for a galvanizing continuous degalvanizing pot, a zinc pot and a crucible. Background Art

[0002] The conventional heating methods for galvanizing and dezincifying pots and alkali cleaning crucible heating furnaces are gas heating or electric heating. Gas heating uses a high-speed burner with good flame rigidity, fast spraying speed, and high flame temperature. The high-speed burner flame directly heats the crucible, making the bottom of the crucible in contact with the flame a local high-temperature area. In the high-temperature area, alkali solution is easy to precipitate and scale, and heat is not easy to transfer in time. The crucible is at risk of being burned through, and the service life is about half a year. In addition, the operating cost of electric heating is relatively high.

[0003] Porous media combustion technology is a brand-new combustion method developed in the international combustion field in the past decade. Compared with the "open flame" combustion with local high temperature during combustion, this combustion has no open flame, and heat is transferred through radiation tube + convection. The heating element is a flat structure with good temperature uniformity, no local high temperature area, and has a large adjustment ratio of 1:15. There is no heat generated by the combustion of fluid flame fuel. More than 70% of the heat is transferred to the crucible surface in the form of infrared radiation, and less than 30% is transferred to the crucible by convection heat exchange.

[0004] In order to solve the problem of local high temperature generated in the galvanizing and de-galvanizing pot, zinc pot and crucible during the heating process, it is urgent to design a new heating furnace system. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a heating furnace and a heating method for a galvanizing continuous zinc stripping pot, a zinc pot and a crucible in view of the above-mentioned problems.

[0006] The embodiment of the present application is implemented as follows:

[0007] The embodiment of the present application provides a heating furnace for a galvanizing and continuous stripping zinc pot and a zinc pot and a crucible, characterized in that it comprises a furnace body, a heating device, a zinc pot and a crucible support frame, the interior of the furnace body is a heating cavity, the zinc pot and the crucible support frame are arranged on the bottom plate of the furnace body at intervals, carrying the zinc pot and the crucible, and a smoke exhaust pipe is embedded on the side wall of the furnace body, which is connected to the heating cavity;

[0008] The heating device comprises a porous medium burner and a burner nozzle. The porous medium burner is embedded on the inner wall of the furnace body, and the burner nozzle is arranged in the gap between the zinc pot and the crucible support frame.

[0009] In some optional embodiments, the porous medium burner includes a rectangular outer frame and a burner base plate, a wind plate support frame is welded to the middle and lower part of the inner wall of the outer frame, the wind plate support frame supports an ordered air distribution plate, the gap between the outer wall of the ordered air distribution plate and the outer frame is sealed by an edge sealing bushing, silicon carbide foam is laid on the ordered air distribution plate, and the center of the burner base plate is connected to the mixed gas pipeline.

[0010] In some optional embodiments, the furnace body includes a furnace shell steel structure, the side walls of the furnace shell steel structure are paved with edge insulation linings and fastened with anchor nails, and the bottom of the furnace shell steel structure is paved with a castable layer.

[0011] In some optional embodiments, the smoke exhaust pipe is a stepped shell structure, a smoke pipe interface is provided on the outer surface of the smoke exhaust pipe, a wind shield is horizontally provided in the inner cavity of the smoke exhaust pipe, and smoke holes are evenly distributed on the bottom plate and the wind shield of the smoke exhaust pipe.

[0012] In some optional embodiments, the zinc pot and crucible support frame are I-shaped structures, made of high temperature resistant steel, and fixed above the pouring material layer of the furnace shell steel structure; the burner is a sub-high speed burner.

[0013] In some optional embodiments, the zinc pot and crucible include a rectangular cavity, rib plates are welded to the side walls of the rectangular cavity, a reinforcing plate is welded to the bottom plate of the rectangular cavity, an epitaxial sealing plate is welded to the edge of the top opening of the rectangular cavity, the sealing plate is configured to be sealed with the top opening of the furnace body to form the heating cavity, and hanging rings are welded around the sealing plate.

[0014] In some optional embodiments, the mixed gas pipeline includes a mixed gas input pipeline, the two ends of the mixed gas input pipeline are respectively connected to the porous medium burner and the mixer, the mixer includes a mixing chamber, the mixing chamber is provided with a gas inlet, an air inlet and a mixed gas outlet, the gas inlet and the air inlet are axially arranged perpendicularly, the gas inlet is connected to the gas inlet pipe, the air inlet is connected to the air inlet pipe, and the mixed gas outlet is connected to the mixer input pipeline.

[0015] In some optional embodiments, the cross-section of the furnace shell steel structure is an integral shell structure with a terrace structure at the bottom and a rectangular structure at the top.

[0016] In some optional embodiments, a guide cone is provided at a position corresponding to the gas inlet in the mixing chamber, and the aperture of the guide cone decreases along the gas inlet direction.

[0017] The method for using the heating furnace for the galvanizing and stripping pot, the zinc pot and the crucible is characterized by comprising the following contents:

[0018] Air and gas enter the mixer through the air inlet and gas inlet respectively in a certain proportion. The fully mixed air and gas pass through the orderly air distribution plate and are evenly sprayed to the silicon carbide foam. They are gradually blown out from the surface of the silicon carbide foam and burn when they encounter sparks to form surface combustion. The silicon carbide preheats the air and gas mixture and burns in a very short time. The burning flame preheats the silicon carbide to produce infrared and visible light, which radiates to the surface of the zinc pot and the crucible for heating, eliminating local high temperature and avoiding the risk of burning through. The burner load is adjusted according to the temperature difference in the furnace to ensure the uniformity of the furnace temperature, so that there is no local high temperature area on the surface of the crucible, reducing scaling and corrosion on the bottom of the crucible.

[0019] The beneficial effects of the present application are as follows: the present application provides a heating furnace and a heating method for a galvanizing and zinc stripping pot, a zinc pot and a crucible, which, while retaining the low operating cost of gas heating, creatively adds a porous medium burner to heat the zinc pot and the crucible in a direct radiation manner, thereby avoiding the risk of high-temperature scaling and burn-through caused by direct heating of a high-temperature flame formed by conventional open flame combustion; the air and coal gas mixture is completely burned in the porous medium, effectively eliminating local high temperatures and reducing NO X emission. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a front view of an embodiment of the present application;

[0022] Figure 2 A side view of an embodiment of the present application;

[0023] Figure 3 This is a schematic diagram of the structure of a porous medium burner according to an embodiment of the present application;

[0024] Figure 4 A front view of a smoke exhaust pipe according to an embodiment of the present application;

[0025] Figure 4a for Figure 4 AA view;

[0026] Figure 4b for Figure 4 BB direction view;

[0027] Figure 5 This is a schematic structural diagram of a zinc pot and a crucible support frame according to an embodiment of the present application;

[0028] Figure 6 This is a schematic diagram of the structure of a zinc pot and a crucible according to an embodiment of the present application;

[0029] Figure 7a A front view of a furnace body according to an embodiment of the present application;

[0030] Figure 7b It is a side view of the furnace body of the embodiment of the present application. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0034] In the description of the present application, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, terms such as "horizontal", "vertical", and "overhanging" do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0035] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0037] The features and performance of the present application are further described in detail below in conjunction with the embodiments.

[0038] like Figure 1 , Figure 2 As shown, the present invention proposes a heating furnace for galvanizing and stripping zinc pots and zinc pots and crucibles, comprising a furnace body 1, a heating device, a zinc pot and a crucible support frame 2, the interior of the furnace body is a heating cavity, the zinc pot and the crucible support frame are arranged at intervals on the bottom plate of the furnace body, carrying the zinc pot and the crucible 3, and a smoke exhaust pipe 4 is embedded on the side wall of the furnace body and is connected to the heating cavity.

[0039] The heating device comprises a porous medium burner 5 and a burner. The porous medium burner is embedded on the inner wall of the furnace body, and the burner is arranged in the gap between the zinc pot and the crucible support frame.

[0040] like Figure 3 As shown, the porous medium burner includes a rectangular outer frame 6 and a burner base plate 7, a wind plate support frame 8 is welded to the middle and lower part of the inner wall of the outer frame, the wind plate support frame supports an ordered air distribution plate 9, the gap between the outer wall of the ordered air distribution plate and the outer frame is sealed by an edge sealing bushing 10, silicon carbide foam 11 is laid flat on the ordered air distribution plate, and the center of the burner base plate is connected to the mixed gas pipeline.

[0041] like Figure 7a , 7bAs shown, the furnace body includes a furnace shell steel structure 12, the side walls of the furnace shell steel structure are paved with edge insulation bushings 13 and fastened by anchor nails 14, and the bottom of the furnace shell steel structure is paved with a casting material layer 15. The middle and lower side walls of the furnace shell are provided with porous medium burner installation holes at a certain angle, which match the distance and position of the burner installation holes on the furnace shell.

[0042] like Figure 4 , Figure 4a , Figure 4b As shown, the exhaust pipe is a stepped shell structure, with a smoke pipe interface 16 on the outer surface of the exhaust pipe, a wind shield 17 horizontally arranged in the inner cavity of the exhaust pipe, and smoke through holes 18 evenly distributed on the bottom plate and wind shield of the exhaust pipe. The exhaust pipe interface passes through the furnace shell steel structure and refractory material and is sealed and welded to the exhaust pipe, and the wind shield is welded and fastened to the exhaust pipe.

[0043] like Figure 5 As shown, the zinc pot and crucible support frame are I-shaped structures made of high-temperature resistant steel and fixed above the castable layer of the furnace shell steel structure, reducing the occupied space area and increasing the heat exchange area and radiation space; the burner adopts a sub-high-speed burner, and adopts stepless continuous adjustment + pull-out control mode (the burner load size is automatically adjusted according to the furnace temperature difference setting. When the load is less than a certain load, a certain number of burners are closed and opened in a set order) to ensure the uniformity of the furnace temperature, so that there is no local high-temperature area on the surface of the zinc pot and crucible, reducing scaling and corrosion on the bottom of the pot and extending the service life.

[0044] like Figure 6 As shown, the zinc pot and crucible include a rectangular cavity, the side walls of the rectangular cavity are welded with rib plates 19, the bottom plate of the rectangular cavity is welded with a reinforcing plate 20, the edge of the top opening of the rectangular cavity is welded with an epitaxial sealing plate 21, the sealing plate is configured to be sealed with the top opening of the furnace body to form a heating cavity, and lifting rings are welded around the sealing plate to facilitate lifting.

[0045] Example 1

[0046] In this embodiment, the mixed gas pipeline includes a mixed gas input pipeline 22, the two ends of which are respectively connected to the porous medium burner and the mixer 23, the mixer includes a mixing chamber, the mixing chamber is provided with a gas inlet 24, an air inlet 25 and a mixed gas outlet 26, the gas inlet and the air inlet are arranged vertically in the axial direction to facilitate the full mixing of gas and air, the gas inlet is connected to the gas inlet pipe, the air inlet is connected to the air inlet pipe, and the mixed gas outlet is connected to the mixer input pipeline. A guide cone 27 is provided at a position corresponding to the gas inlet in the mixing chamber, and the aperture of the guide cone decreases along the air intake direction.

[0047] Furthermore, the cross section of the furnace shell steel structure is an integral shell structure with a terrace structure at the bottom and a rectangular structure at the top.

[0048] When the above heating furnace is in use, it includes the following contents:

[0049] Air and gas enter the mixer through the air inlet and gas inlet respectively in a certain proportion. The fully mixed air and gas pass through the orderly air distribution plate and are evenly sprayed to the silicon carbide foam. They are gradually blown out from the surface of the silicon carbide foam and burn when they encounter sparks to form surface combustion. The silicon carbide preheats the air and gas mixture and burns in a very short time. The burning flame preheats the silicon carbide to produce infrared and visible light, which radiates to the surface of the zinc pot and the crucible for heating, eliminating local high temperature and avoiding the risk of burning through. The burner load is adjusted according to the temperature difference in the furnace to ensure the uniformity of the furnace temperature, so that there is no local high temperature area on the surface of the crucible, reducing scaling and corrosion on the bottom of the crucible.

[0050] In the present application, the porous medium combustion flame does not directly contact the zinc pot and the crucible, and heat is transferred through the radiation tube + convection, and the heating element is a planar structure, the temperature uniformity is good, there is no local high temperature area, and it has a large adjustment ratio of 1:15. More than 70% of the radiation heat is transferred to the surface of the zinc pot and the crucible in the form of infrared rays, and less than 30% is transferred to the zinc pot and the crucible by convection heat exchange, so that there is no local high temperature area on the surface of the zinc pot and the crucible, the service life of the zinc pot and the crucible is extended, the operating cost of the zinc pot and the crucible is reduced, the service life of the zinc pot and the crucible is increased, emissions are reduced, energy is saved, operating costs are reduced, and the service life of the zinc pot and the crucible is extended.

Claims

1. A heating furnace for galvanizing, stripping, zinc pots and crucibles, characterized in that: It includes a furnace body, a heating device, a zinc pot and a crucible support frame, wherein the interior of the furnace body is a heating cavity, the zinc pot and the crucible support frame are arranged on the bottom plate of the furnace body at intervals, and carry the zinc pot and the crucible, and a smoke exhaust pipe is embedded on the side wall of the furnace body, which is connected to the heating cavity; The heating device comprises a porous medium burner and a burner nozzle. The porous medium burner is embedded on the inner wall of the furnace body, and the burner nozzle is arranged in the gap between the zinc pot and the crucible support frame.

2. The heating furnace for galvanizing and stripping pots, zinc pots and crucibles according to claim 1, characterized in that: The porous medium burner comprises a rectangular outer frame and a burner bottom plate, a wind plate support frame is welded to the middle and lower part of the inner wall of the outer frame, the wind plate support frame supports an ordered air distribution plate, the gap between the outer wall of the ordered air distribution plate and the outer frame is sealed by an edge sealing bushing, silicon carbide foam is laid flat on the ordered air distribution plate, and the center of the burner bottom plate is connected to a mixed gas pipeline.

3. The heating furnace for galvanizing and stripping pots, zinc pots and crucibles according to claim 2, characterized in that: The furnace body comprises a furnace shell steel structure, the side walls of the furnace shell steel structure are paved with edge heat insulation bushings and fastened by anchor nails, and the bottom of the furnace shell steel structure is paved with a casting material layer.

4. The heating furnace for galvanizing and stripping pots, zinc pots and crucibles according to claim 3, characterized in that: The smoke exhaust pipe is a stepped shell structure, a smoke pipe interface is arranged on the outer surface of the smoke exhaust pipe, a wind shield is arranged horizontally in the inner cavity of the smoke exhaust pipe, and smoke through holes are evenly distributed on the bottom plate and the wind shield of the smoke exhaust pipe.

5. The heating furnace for galvanizing and stripping pots, zinc pots and crucibles according to claim 4, characterized in that: The zinc pot and crucible support frame are I-shaped structures, made of high temperature resistant steel, and fixed above the pouring material layer of the furnace shell steel structure; the burner is a sub-high speed burner.

6. The heating furnace for galvanizing and stripping pots, zinc pots and crucibles according to claim 5, characterized in that: The zinc pot and crucible include a rectangular cavity, the side walls of the rectangular cavity are welded with ribs, the bottom plate of the rectangular cavity is welded with a reinforcing plate, the edge of the top opening of the rectangular cavity is welded with an epitaxial sealing plate, the sealing plate is configured and sealed with the top opening of the furnace body to form the heating cavity, and hanging rings are welded around the sealing plate.

7. The heating furnace for galvanizing and stripping pots, zinc pots and crucibles according to claim 2 or 6, characterized in that: The mixed gas pipeline comprises a mixed gas input pipeline, the two ends of which are respectively connected to the porous medium burner and the mixer, the mixer comprises a mixing cavity, the mixing cavity is provided with a gas inlet, an air inlet and a mixed gas outlet, the gas inlet and the air inlet are axially perpendicularly arranged, the gas inlet is connected to the gas inlet pipe, the air inlet is connected to the air inlet pipe, and the mixed gas outlet is connected to the mixer input pipeline.

8. The heating furnace for galvanizing and stripping pots, zinc pots and crucibles according to claim 3 or 6, characterized in that: The cross section of the furnace shell steel structure is an integral shell structure with a terrace structure at the bottom and a rectangular structure at the top.

9. The heating furnace for galvanizing and stripping pots, zinc pots and crucibles according to claim 7, characterized in that: A guide cone is provided at a position corresponding to the gas inlet in the mixing chamber, and the aperture of the guide cone decreases along the gas inlet direction.

10. The method for using the heating furnace for the galvanizing and stripping pot, zinc pot and crucible according to claim 7, characterized in that: It includes the following: Air and gas enter the mixer through the air inlet and gas inlet respectively in a certain proportion. The fully mixed air and gas pass through the orderly air distribution plate and are evenly sprayed to the silicon carbide foam. They are gradually blown out from the surface of the silicon carbide foam and burn when they encounter sparks to form surface combustion. The silicon carbide preheats the air and gas mixture and burns in a very short time. The burning flame preheats the silicon carbide to produce infrared and visible light, which radiates to the surface of the zinc pot and the crucible for heating, eliminating local high temperature and avoiding the risk of burning through. The burner load is adjusted according to the temperature difference in the furnace to ensure the uniformity of the furnace temperature, so that there is no local high temperature area on the surface of the crucible, reducing scaling and corrosion on the bottom of the crucible.

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