Continuous annealing device for preventing oxidation color of pre-bright strip steel from being formed

Abstract

The utility model discloses a continuous annealing device for preventing oxidation color formation of pre-bright strip steel, which comprises a rack, and an annealing furnace for strip steel annealing is fixed on the rack; a gas inlet mechanism is fixed on the annealing furnace and is used for introducing nitrogen and hydrogen into the annealing furnace; a smoke recycling mechanism is installed on the machine frame and used for smoke purification and heat energy recycling in the annealing furnace, the smoke recycling mechanism comprises a smoke cavity and a first sucking pump which are fixed to the annealing furnace, a plurality of smoke outlet pipes communicated with the smoke cavity are fixed to the annealing furnace, and an air inlet of the first sucking pump is communicated with the smoke cavity. The utility model relates to the technical field of annealing devices, in particular to a continuous annealing device for preventing oxidation color formation of pre-bright strip steel, and solves the problems that high-temperature flue gas during annealing of an annealing furnace of the conventional continuous annealing device for preventing oxidation color formation of pre-bright strip steel is exhausted along with an exhaust pipe, so that heat loss during annealing is serious, heat energy is not fully utilized, and the service life of the continuous annealing device is prolonged. And the production cost can not be saved.

Description

Technical Field

[0001] The utility model relates to the technical field of annealing devices, in particular to a continuous annealing device for preventing oxidation color of bright strip steel from being formed. Background Art

[0002] In the cold rolling continuous annealing production, the strip steel that was shut down due to furnace maintenance, troubleshooting, and restarting production will be oxidized due to the high oxygen content in the furnace, and the strip steel surface will be oxidized and present an oxidized color; there will also be slight leakage of gas (oxygen) and water into the furnace, and under high temperature conditions, the strip steel surface will be oxidized and present an oxidized color, including some steel coils that have been stored for a long time and have oxidized surfaces. These oxidized strip steels are waste and are usually treated as scrap steel. This results in a waste of strip steel materials.

[0003] In order to solve the above-mentioned problems, technologies such as annealing furnaces protected by reducing gases have been developed. An oxygen-free or reducing atmosphere is used to ensure that the strip steel is not oxidized at the high temperature of the annealing process, thereby preventing the formation of oxidation color of the bright strip steel. For example, the existing patent CN110218857B discloses an annealing and decolorizing device for oxidized strip steel applied to the field of metallurgical industrial production technology. The annealing and decolorizing device for oxidized strip steel and the annealing and decolorizing method for oxidized strip steel described in the invention can conveniently and reliably anneal and decolorize the strip steel with surface oxidation color that is inevitably generated during the cold rolling continuous annealing production, so that the surface quality and mechanical properties of unqualified strip steel products are qualified, avoiding strip waste, and effectively achieving cost reduction and efficiency improvement.

[0004] However, the existing continuous annealing devices for preventing the formation of oxidation color of bright strip steel generally have the following defects and shortcomings: the high-temperature flue gas during annealing in the annealing furnace is discharged through the exhaust pipe, resulting in serious heat loss during annealing, and the heat energy is not fully utilized, which is not conducive to saving production costs. For this reason, we propose a continuous annealing device for preventing the formation of oxidation color of bright strip steel. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a continuous annealing device to prevent the formation of oxidation color of pre-bright steel strip, which solves the problem that in the existing continuous annealing device to prevent the formation of oxidation color of pre-bright steel strip, the high-temperature flue gas during annealing in the annealing furnace is discharged through the exhaust pipe, resulting in serious heat loss during annealing, and the heat energy is not fully utilized, which is not conducive to saving production costs.

[0006] To achieve the above objectives, the utility model is implemented through the following technical solutions: A continuous annealing device for preventing the formation of oxidation color of pre-bright strip steel, comprising a frame, on which an annealing furnace is fixed for annealing the strip steel;

[0007] The annealing furnace is provided with an air intake mechanism for introducing nitrogen and hydrogen into the annealing furnace;

[0008] The frame is equipped with a flue gas recycling mechanism for flue gas purification and heat energy recycling in the annealing furnace, the flue gas recycling mechanism includes a smoke chamber and a first exhaust pump fixed on the annealing furnace, a plurality of smoke exhaust pipes connected to the smoke chamber are fixed on the annealing furnace, the air inlet of the first exhaust pump is connected to the smoke chamber, and the air outlet is connected to the auxiliary heat chamber fixed on the two side walls of the annealing furnace through the exhaust pipe;

[0009] The frame is also equipped with a waste heat recovery mechanism for recovering waste heat from flue gas after purification and heat energy recycling.

[0010] Preferably, a heating device is installed at the bottom of the annealing furnace for heating the inside of the annealing furnace. A plurality of rollers are installed at equal intervals in the annealing furnace for conveying the strip steel. The rollers are installed at the output end of an external motor and driven to rotate by the external motor. The external motor is fixed on the annealing furnace. Furnace doors are installed at both ends of the annealing furnace.

[0011] Preferably, the air intake mechanism comprises a fixing frame fixed on the annealing furnace, and two ventilation pipes are installed on the fixing frame for respectively introducing nitrogen and hydrogen into the annealing furnace.

[0012] Preferably, a plurality of filter screens are movably mounted inside the smoke chamber, the plurality of filter screens are evenly spaced in the smoke chamber, and an inspection door is hingedly mounted on the smoke chamber.

[0013] Preferably, a plurality of baffles are fixed inside the auxiliary heating cavity, and the plurality of baffles are distributed in the auxiliary heating cavity at equal intervals.

[0014] Preferably, the waste heat recovery mechanism includes a water tank fixed on the frame and a second vacuum pump fixed on the water tank, the air inlet of the second vacuum pump is connected to one end of the auxiliary heating cavity through an air inlet pipe, and the air outlet is connected to the water tank through an air outlet pipe, and an exhaust pipe and a drain pipe are installed on the water tank.

[0015] Beneficial Effects

[0016] The utility model provides a continuous annealing device for preventing the formation of oxidation color of pre-bright strip steel. Compared with the prior art, it has the following beneficial effects:

[0017] 1. A continuous annealing device for preventing the formation of oxidation color of bright steel strip. An air intake mechanism is installed on the annealing furnace to introduce nitrogen and hydrogen into the annealing furnace. Through reducing gas protection, an oxygen-free or reducing atmosphere is used to ensure that the steel strip is not oxidized under the high temperature of the annealing process to prevent the formation of oxidation color of bright steel strip. A flue gas recycling mechanism is installed on the annealing furnace. The flue gas recycling mechanism includes a smoke chamber, a smoke outlet pipe, etc. The high-temperature flue gas generated during annealing will enter the smoke chamber through the smoke outlet pipe. The first exhaust pump is started to filter and purify the smoke in the smoke chamber through a filter net, and then the smoke is extracted through the first exhaust pump into the auxiliary heating chamber. The side wall of the smoke outlet pipe is heated by the waste heat of the flue gas, so as to achieve auxiliary heating and heat preservation of the smoke outlet pipe, so that the heat discharged by the flue gas can be reused, thereby reducing heat energy loss and improving heat energy utilization rate.

[0018] 2. The continuous annealing device for preventing the formation of oxidation color of pre-bright strip steel is also equipped with a waste heat recovery mechanism on the frame. The waste heat recovery mechanism includes a water tank, a second vacuum pump, etc. The flue gas entering the auxiliary heating cavity is pumped into the water tank by starting the second vacuum pump to heat the water in the water tank, so that the waste heat in the flue gas is further recovered by being absorbed by water, so that the heat is stored and the heat energy loss is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the three-dimensional structure of the utility model from the first viewing angle;

[0020] Figure 2 This is a schematic diagram of the three-dimensional structure of the utility model from a second viewing angle;

[0021] Figure 3 This is a schematic diagram of the cross-sectional structure of the top of the smoke chamber of the utility model;

[0022] Figure 4 It is a schematic diagram of the cross-sectional structure of the auxiliary heating cavity of the utility model.

[0023] In the figure: 1. frame; 2. annealing furnace; 3. air intake mechanism; 31. fixed frame; 32. ventilation pipe; 4. flue gas recycling mechanism; 41. smoke chamber; 42. smoke outlet pipe; 43. filter screen; 44. first vacuum pump; 45. smoke exhaust pipe; 46. auxiliary heating cavity; 461. baffle; 5. waste heat recovery mechanism; 51. water tank; 52. second vacuum pump; 53. air intake pipe; 54. air outlet pipe; 6. roller. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] See also Figure 1-4 , the utility model provides two technical solutions:

[0026] Embodiment 1:

[0027] A continuous annealing device for preventing the formation of oxidation color of pre-bright steel strip, comprising a frame 1, on which an annealing furnace 2 is fixed for annealing the steel strip;

[0028] An air inlet mechanism 3 is fixed on the annealing furnace 2 for introducing nitrogen and hydrogen into the annealing furnace 2;

[0029] A flue gas recycling mechanism 4 is installed on the frame 1 for flue gas purification and heat energy recycling in the annealing furnace 2. The flue gas recycling mechanism 4 includes a smoke chamber 41 and a first air pump 44 fixed on the annealing furnace 2. A plurality of smoke outlet pipes 42 connected to the smoke chamber 41 are fixed on the annealing furnace 2. The air inlet of the first air pump 44 is connected to the smoke chamber 41, and the air outlet is connected to the auxiliary heat chamber 46 fixed to the two side walls of the annealing furnace 2 through the smoke exhaust pipe 45.

[0030] A waste heat recovery mechanism 5 is also installed on the frame 1 for recovering waste heat from the flue gas after purification and heat energy recycling.

[0031] Embodiment 2:

[0032] A continuous annealing device for preventing the formation of oxidation color of bright strip steel, wherein a heating device is installed at the bottom of the annealing furnace 2 for heating the inside of the annealing furnace 2, and a plurality of rollers 6 are installed at equal intervals in the annealing furnace 2 for conveying the strip steel, and the rollers 6 are installed at the output end of an external motor and driven to rotate by the external motor, and the external motor is fixed on the annealing furnace 2, and furnace doors are installed at both ends of the annealing furnace 2 to facilitate the strip steel to enter and exit the annealing furnace 2; an air intake mechanism 3 includes a fixed frame 31 fixed on the annealing furnace 2, and two fixed frames 31 are installed on the fixed frame 31 The ventilation pipes 32 are used to introduce nitrogen and hydrogen into the annealing furnace 2 respectively, and through reducing gas protection, the heating device in the annealing furnace 2 uses an oxygen-free or reducing atmosphere to ensure that the strip steel is not oxidized under the high temperature of the annealing process, thereby preventing the formation of oxidation color of the bright strip steel; the interior of the smoke chamber 41 is also movably connected with a plurality of filter screens 43, and the plurality of filter screens 43 are evenly spaced in the smoke chamber 41. An inspection door is hingedly installed on the smoke chamber 41. The first exhaust pump 44 is started to filter and purify the smoke in the smoke chamber 41 through the filter screens 43. The exhaust gas enters the auxiliary heating chamber 46 through the first exhaust pump 44, and the inspection door facilitates the disassembly and replacement of the filter screen 43 at a later time; a plurality of baffles 461 are also fixed inside the auxiliary heating chamber 46, and the plurality of baffles 461 are evenly spaced in the auxiliary heating chamber 46. The baffles 461 can block the smoke when it flows in the auxiliary heating chamber 46, delay the flow of the smoke, and make it fully contact with the outer wall of the annealing furnace 2 to perform auxiliary heating on the annealing furnace 2; the waste heat recovery mechanism 5 includes a water tank 51 fixed on the frame 1 and a water tank 51 fixed on the water tank The second vacuum pump 52 on 51, the air inlet of the second vacuum pump 52 is connected with one end of the auxiliary heating cavity 46 through the air inlet pipe 53, and the air outlet is connected with the water tank 51 through the air outlet pipe 54. The water tank 51 is equipped with an exhaust pipe and a drain pipe. The flue gas entering the auxiliary heating cavity 46 is pumped into the water tank 51 by starting the second vacuum pump 52 to heat the water in the water tank 51, so that the residual heat in the flue gas is further recovered by being absorbed by water. The exhaust pipe is used for depressurizing the water tank 51, and the drain pipe is used for discharging hot water.

[0033] When the continuous annealing device for preventing the formation of oxidation color of bright steel strip is used, the furnace door is opened, and the bright steel strip is guided and transported to the inside of the annealing furnace 2 through the roller 6. The annealing furnace 2 is equipped with an air intake mechanism 3 for introducing nitrogen and hydrogen into the inside of the annealing furnace 2. Through reducing gas protection, the heating device in the annealing furnace 2 uses an oxygen-free or reducing atmosphere to ensure that the steel strip is not oxidized under the high temperature of the annealing process, thereby preventing the formation of oxidation color of the bright steel strip. During annealing, a flue gas recycling mechanism 4 is installed on the annealing furnace 2. The flue gas recycling mechanism 4 includes a smoke chamber 41, a smoke outlet pipe 42, etc. The high-temperature smoke generated during annealing will enter the smoke chamber 41 through the smoke outlet pipe 42, and the first exhaust pump 44 is started to filter the smoke in the smoke chamber 41. After being filtered and purified by the net 43, the smoke is extracted through the first vacuum pump 44 and enters the auxiliary heating cavity 46, and then the side wall of the smoke outlet pipe 42 is heated by the waste heat of the smoke, so as to achieve the auxiliary heating and heat preservation effect on the smoke outlet pipe 42, so that the heat discharged by the smoke is reused, the heat energy loss is reduced, and the heat energy utilization rate is improved; in addition, a waste heat recovery mechanism 5 is also installed on the frame 1 of the utility model, and the waste heat recovery mechanism 5 includes a water tank 51, a second vacuum pump 52, etc. The smoke entering the auxiliary heating cavity 46 is extracted into the water tank 51 by starting the second vacuum pump 52 to heat the water in the water tank 51, so that the waste heat in the smoke is further recovered by water absorption, so that the heat is stored and the heat energy loss is reduced.

[0034] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0035] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A continuous annealing device for preventing the formation of oxidation color of pre-bright steel strip, comprising a frame (1), characterized in that: An annealing furnace (2) is fixed on the frame (1) for annealing the steel strip; An air intake mechanism (3) is fixed on the annealing furnace (2) for introducing nitrogen and hydrogen into the annealing furnace (2); The frame (1) is provided with a flue gas recycling mechanism (4) for flue gas purification and heat energy recycling in the annealing furnace (2), the flue gas recycling mechanism (4) comprising a smoke chamber (41) fixed on the annealing furnace (2) and a first air pump (44), a plurality of smoke outlet pipes (42) connected to the smoke chamber (41) are fixed on the annealing furnace (2), the air inlet of the first air pump (44) is connected to the smoke chamber (41), and the air outlet is connected to an auxiliary heat chamber (46) fixed to the two side walls of the annealing furnace (2) through a smoke exhaust pipe (45); The frame (1) is also provided with a waste heat recovery mechanism (5) for recovering waste heat from flue gas after purification and heat energy recycling.

2. A continuous annealing device for preventing oxidation color formation of pre-bright steel strip according to claim 1, characterized in that: A heating device is installed at the bottom of the annealing furnace (2) for heating the inside of the annealing furnace (2). A plurality of rollers (6) are installed at equal intervals in the annealing furnace (2) for conveying the strip steel. The rollers (6) are installed at the output end of an external motor and are driven to rotate by the external motor. The external motor is fixed on the annealing furnace (2). Furnace doors are installed at both ends of the annealing furnace (2).

3. The continuous annealing device for preventing oxidation color formation of pre-bright steel strip according to claim 1, characterized in that: The air intake mechanism (3) comprises a fixing frame (31) fixed on the annealing furnace (2), and two ventilation pipes (32) are installed on the fixing frame (31) for respectively introducing nitrogen and hydrogen into the annealing furnace (2).

4. The continuous annealing device for preventing oxidation color formation of pre-bright steel strip according to claim 1, characterized in that: A plurality of filter screens (43) are also movably mounted inside the smoke chamber (41), and the plurality of filter screens (43) are evenly spaced and distributed inside the smoke chamber (41). An inspection door is hingedly mounted on the smoke chamber (41).

5. The continuous annealing device for preventing oxidation color formation of pre-bright steel strip according to claim 1, characterized in that: A plurality of baffles (461) are also fixed inside the auxiliary heating cavity (46), and the plurality of baffles (461) are distributed at equal intervals inside the auxiliary heating cavity (46).

6. The continuous annealing device for preventing oxidation color formation of pre-bright steel strip according to claim 1, characterized in that: The waste heat recovery mechanism (5) comprises a water tank (51) fixed on the frame (1) and a second air pump (52) fixed on the water tank (51); an air inlet of the second air pump (52) is connected to one end of the auxiliary heat cavity (46) through an air inlet pipe (53); an air outlet of the second air pump (52) is connected to the water tank (51) through an air outlet pipe (54); an exhaust pipe and a liquid discharge pipe are installed on the water tank (51).

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