Energy-saving walking beam furnace

Abstract

The invention provides an energy-saving walking type heating furnace, and relates to the technical field of walking type heating furnaces, a plurality of walking beams and a plurality of fixed beams are arranged in the energy-saving walking type heating furnace, the walking beams and the fixed beams are used for supporting heated blanks, the fixed beams are sequentially arranged at intervals, one walking beam is arranged between every two adjacent fixed beams, and the other walking beam is arranged between every two adjacent fixed beams. The walking beam comprises a supporting part, a first refractory brick layer and a first refractory fiber layer which are arranged in sequence, and the top of the supporting part can make direct contact with a blank. According to the energy-saving walking beam furnace, heat loss brought away by the walking beam furnace supporting beam can be effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of walking beam heating furnaces, and in particular to an energy-saving walking beam heating furnace. Background Art

[0002] Walking beam heating furnaces are currently widely used in the steel rolling process of the metallurgical industry. Walking beam heating furnaces are mainly used for heating steel billets before rolling, and the heating temperature is generally 1000-1300°C. Depending on the billet and the production line, the walking beam heating furnace can be divided into an end-in-end-out slab heating furnace and a side-in-side-out billet heating furnace. Regardless of the type of heating furnace, due to the high temperature inside the furnace, the support beams in the furnace need to be cooled by water, and vaporization cooling is generally used. Although vaporization cooling can produce useful steam, it will also take away a large amount of effective heat. The absorbed heat accounts for about 10% of the total heat input, which is not conducive to saving energy from the source.

[0003] In addition, the furnace roof and furnace wall of a conventional walking-beam heating furnace generally adopt castable or plastic structure, the furnace wall thickness is about 500mm, and the furnace roof thickness is about 350mm. Due to the poor thermal insulation performance of castable or plastic, the outer surface temperature of the furnace wall and furnace roof is high, the furnace wall surface temperature is generally around 90°C, and the furnace roof surface temperature is generally around 120°C. The operating environment of the furnace area is harsh, and the heat dissipation loss of the furnace lining is also large.

[0004] In view of this, the inventor has designed an energy-saving walking-beam heating furnace based on many years of production design experience in this field and related fields and after repeated experiments, in order to solve the problems existing in the prior art. Summary of the invention

[0005] The object of the present invention is to provide an energy-saving walking beam heating furnace, which can effectively reduce the heat loss taken away by the supporting beams of the walking beam heating furnace.

[0006] To achieve the above-mentioned purpose, the present invention proposes an energy-saving walking-beam heating furnace, wherein the energy-saving walking-beam heating furnace is provided with a plurality of walking beams and a plurality of fixed beams for supporting the heated blanks, the plurality of fixed beams are arranged in sequence and spaced apart, and a walking beam is provided between two adjacent fixed beams, the walking beam comprises a supporting part, a first refractory brick layer and a first refractory fiber layer which are arranged in sequence, and the top of the supporting part can be in direct contact with the blanks.

[0007] Compared with the prior art, the present invention has the following characteristics and advantages:

[0008] The energy-saving walking-beam heating furnace proposed in the present invention has a water-free cooling structure for the walking beam, thereby avoiding the heat loss caused by cooling water and saving gas consumption. At the same time, since no cooling water is required, the consumption of cooling water is also saved, which has the dual effects of energy saving and water saving. In addition, a first refractory brick layer and a first refractory fiber layer are arranged at the bottom of the walking beam, and the first refractory brick layer and the first refractory fiber layer play a role of thermal insulation. The temperature of the walking beam is basically consistent with the furnace temperature. There is no "cold zone" with lower temperature on the walking beam, and the blank will not form a "black mark" during the heating process, which is beneficial to improving the temperature uniformity of heating. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The accompanying drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the figures are only schematic, used to help understand the present invention, and are not specifically limited to the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to the teachings of the present invention.

[0010] Figure 1 A schematic longitudinal section diagram of the energy-saving walking beam heating furnace proposed by the present invention;

[0011] Figure 2 A schematic longitudinal section diagram of the energy-saving walking beam heating furnace proposed by the present invention;

[0012] Figure 3 It is a schematic diagram of the structure of the walking beam and the fixed beam in the present invention.

[0013] Description of Reference Numerals

[0014] 100. Energy-saving walking beam heating furnace; 10. Walking beam;

[0015] 11. Supporting part; 12. First refractory brick layer;

[0016] 13. a first refractory fiber layer; 14. a first fixing plate;

[0017] 20. Fixed beam; 30. Stepping mechanism;

[0018] 40. Water seal knife; 50. Water seal groove;

[0019] 60. Burner; 70. Furnace wall;

[0020] 80. Furnace top; 90. Loading and unloading equipment;

[0021] 110. furnace bottom; 111. second refractory brick layer;

[0022] 112. a second refractory fiber layer; 113. a second fixing plate;

[0023] 200. Blank. DETAILED DESCRIPTION

[0024] The details of the present invention can be more clearly understood with reference to the accompanying drawings and the description of the specific embodiments of the present invention. However, the specific embodiments of the present invention described herein are only used for the purpose of explaining the present invention and cannot be understood as limiting the present invention in any way. Under the guidance of the present invention, technicians can conceive of any possible variations based on the present invention, which should all be considered to belong to the scope of the present invention.

[0025] like Figures 1 to 3 As shown, the present invention proposes an energy-saving walking-beam heating furnace 100, in which a plurality of walking beams 10 and a plurality of fixed beams 20 for supporting heated blanks are arranged, the plurality of fixed beams 20 are arranged in sequence and spaced apart, a walking beam 10 is provided between two adjacent fixed beams 20, the walking beam 10 comprises a supporting portion 11, a first refractory brick layer 12 and a first refractory fiber layer 13 arranged in sequence, and the top of the supporting portion 11 can be in direct contact with the blank 200.

[0026] The energy-saving walking-beam heating furnace 100 proposed in the present invention has a water-free cooling structure for the walking beam 10, thereby avoiding the heat loss caused by cooling water and saving about 10% of gas consumption. At the same time, since no cooling water is required, the consumption of cooling water is also saved, which has the dual effects of energy saving and water saving. In addition, a first refractory brick layer 12 and a first refractory fiber layer 13 are arranged at the bottom of the walking beam 10, and the first refractory brick layer 12 and the first refractory fiber layer 13 play a role of thermal insulation. The temperature of the walking beam 10 is basically consistent with the furnace temperature. There is no "cold zone" with lower temperature on the walking beam 10, and the blank will not form a "black mark" during the heating process, which is beneficial to improving the temperature uniformity of heating.

[0027] In an optional embodiment of the present invention, the support portion 11 includes a supporting steel structure and a casting material body cast outside the supporting steel structure. With the above structure, the refractory structure formed by the casting material body and the supporting steel structure can not only withstand the high temperature in the heating furnace, but also directly contact the blank 200 to effectively support the blank 200.

[0028] In an optional example of this embodiment, the casting body is formed by solidifying a heavy casting material, and the density of the heavy casting material is 2400 kg / m 3 , can be in direct contact with the heated blank 200, has very high strength after high-temperature sintering, can effectively support the blank, and the thickness of the casting body depends on the depth of the furnace.

[0029] In an optional example of this embodiment, the castable body and the first refractory brick layer 12 are fixedly connected via an interlocking structure to improve the connection strength between the castable body and the first refractory brick layer 12 .

[0030] In an optional example, the casting body is provided with a limiting groove, and the first refractory brick layer 12 is provided with a matching limiting boss, which is embedded in the limiting groove. That is, the top of the first refractory brick layer 12 is "convex" and the bottom of the casting body is "concave", thereby forming an interlocking structure to increase the connection strength between the casting body and the first refractory brick layer 12.

[0031] In an optional example, the first refractory brick layer 12 is composed of lightweight refractory bricks, and the density of lightweight refractory bricks is generally 800 kg / m 3 Preferably, the total thickness of the first refractory brick layer 12 is generally 136 mm.

[0032] In an optional example, the first refractory fiber layer is composed of a refractory fiber board with a total thickness of about 80 mm, which plays a role of thermal insulation.

[0033] In an optional example of the present invention, a first fixed plate 14 is provided at the bottom of the side wall of the walking beam 10, and the first fixed plate 14 is used to protect the first refractory brick layer 12 and the first refractory fiber layer 13 to avoid damage to the first refractory brick layer 12 and the first refractory fiber layer 13 due to the frequent reciprocating motion of the walking beam 10 in the furnace.

[0034] In an optional example, the first fixing plate 14 is L-shaped and has a horizontal portion and a vertical portion arranged vertically, the horizontal portion is arranged on the lower surface of the first refractory fiber layer 13, the vertical portion is arranged on the side of the first refractory fiber layer 13 and the first refractory brick layer 12, and the top of the vertical portion is fixedly connected to the support portion 11. With the above structure, the first fixing plate 14 protects and fixes the bottom and side of the first refractory fiber layer 13 and the first refractory brick layer 12; and the top of the first fixing plate 14 is directly fixedly connected to the support portion 11, so that the interlocking structure is also included in the action range of the first fixing plate 14, further enhancing the connection strength between the first refractory brick layer 12 and the support portion 11.

[0035] Preferably, a plurality of first fixed plates 14 are sequentially arranged at intervals along the length direction (furnace length direction) of the stepping beam 10, and each first fixed plate 14 is generally made of heat-resistant cast iron or cast steel (typical material ZGCr9Si2). The wall thickness of the first fixed plate 14 is about 20 mm, and the total height and width of the first fixed plate 14 are about 210 mm. The length of a single first fixed plate 14 in the furnace length direction is about 1000 mm, and the gap between two adjacent first fixed plates 14 is about 20 mm, to facilitate the expansion of the first fixed plate 14 in a hot state.

[0036] In another optional embodiment of the present invention, the walking beam 10 whose support portion 11 is located in the upper part of the furnace uses a heat-resistant steel frame instead of the cast material body, and the part of the support portion 11 that can extend outside the road still maintains the supporting steel structure and the cast material body.

[0037] In an optional example of this embodiment, a plurality of columns are provided in the heat-resistant steel frame to increase the supporting strength of the heat-resistant steel frame.

[0038] In an optional embodiment of the present invention, a heat-resistant support pad (not shown in the figure) is provided on the top of the support portion 11, so that the blank does not directly contact the casting body, which is beneficial to improve the life of the casting body, increase the furnace depth, and further improve the heating quality.

[0039] In an optional embodiment of the present invention, the width of the walking beam 10 is 700 mm (the width of the top support portion 11), and the distance between the first fixed plates 14 on both sides of the bottom of the walking beam 10 is 670 mm.

[0040] In an optional embodiment of the present invention, a plurality of fixed beams 20 are respectively fixedly arranged on the furnace bottom 110 of the energy-saving walking-beam heating furnace 100, and a second refractory brick layer 111 and a second refractory fiber layer 112 are arranged at the bottom of the furnace bottom 110. With the above structure, the fixed beam 20 also adopts a water-free cooling structure, which has the dual effects of energy saving and water saving. At the same time, the second refractory brick layer 111 and the second refractory fiber layer 112 arranged at the bottom of the furnace bottom 110 play a role in heat preservation and insulation, further ensuring the stability of the furnace temperature. Similarly, there is no "cold zone" with a lower temperature on the fixed beam 20, and the blank will not form a "black mark" during the heating process, which is conducive to improving the temperature uniformity of heating.

[0041] In an optional example of this embodiment, the furnace bottom 110 includes a furnace bottom supporting steel structure and a furnace bottom refractory material, the furnace bottom refractory material is a castable composite structure, and the uppermost layer of the furnace bottom 110 is

[0042] Heavy castable, the lower part of the furnace bottom 110 is a second refractory brick layer 111 and a second refractory fiber layer 112, the thickness of the furnace bottom 110 is 466mm, of which the thickness of the heavy castable is 250mm, the second refractory brick layer 111 is composed of second refractory bricks, the thickness of the second refractory bricks is 136mm, the second refractory fiber layer 112 is composed of second refractory fiberboard, the thickness of the second refractory fiberboard is 80mm.

[0043] Furthermore, similar to the walking beam 10 , a second fixing plate 113 is also provided at a corresponding position of the furnace bottom 110 for protection and fixing, and the heavy castable and the second refractory brick layer 111 adopt an interlocking structure.

[0044] In an optional example, the fixed beam 20 is disposed on the furnace bottom 110 , and the fixed beam 20 is entirely cast by castable material (cast integrally with the heavy castable material of the furnace bottom 110 ).

[0045] In another optional example, the fixed beam 20 is a heat-resistant steel frame, and the heat-resistant steel frame is fixedly connected to the supporting steel structure of the furnace bottom 110 .

[0046] In an optional example, the height of the fixed beam 20 should not be too high, generally about 500 mm, and the width is about 500 mm. The stepping height of the walking beam 10 is 200 mm, so when the walking beam 10 is in the lower position, the walking beam 10 is 100 mm lower than the fixed beam 20, and when the walking beam 10 is in the upper position, the walking beam 10 is 100 mm higher than the fixed beam. With the above structure, the four-sided heating of the blank can be achieved, which is conducive to shortening the length of the furnace, reducing investment, improving the heating quality, and avoiding the influence of the iron oxide scale generated during the heating process on the production.

[0047] In an optional example of this embodiment, the bottoms of multiple walking beams 10 pass through the furnace bottom 110 and are connected to the walking mechanism 30, and there is a gap between the side walls of each walking beam 10 and the furnace bottom 110, and a water sealing knife 40 is arranged between the side walls of the walking beam 10 and the furnace bottom 110, and multiple water sealing grooves 50 are arranged on the walking mechanism 30, and the bottom of the water sealing knife 40 is inserted into the water sealing groove 50 to achieve sealing of the furnace bottom 110.

[0048] In an optional example, the stepping mechanism 30 has a supporting steel structure for supporting the stepping beam 10 , and the horizontal portion of the first fixing plate 14 is fixedly connected to the supporting steel structure of the stepping mechanism 30 by bolts.

[0049] In an optional example, the gap between the furnace bottom 110 and the walking beam 10 is about 50 mm.

[0050] In an optional example of the present invention, the furnace wall 70 and the furnace roof 80 of the energy-saving walking-beam heating furnace 100 all use refractory fiber structures as linings, which will greatly reduce the outer surface temperature of the furnace wall 70 and the furnace roof 80, which is beneficial to improving the operating environment of the furnace area and reducing the heat loss caused by the heat dissipation of the furnace lining, and reducing the heat storage loss during the startup stage.

[0051] Preferably, the total thickness of the furnace wall 70 and the total thickness of the furnace roof is 350 mm. The refractory fiber structure includes a refractory fiber module and a refractory fiber blanket, wherein the refractory fiber module has a thickness of 300 mm and the refractory fiber blanket has a thickness of 50 mm.

[0052] In an optional example of the present invention, the burners 60 of the energy-saving walking-beam heating furnace 100 are all arranged on both sides of the furnace in a single-layer arrangement. According to the heating requirements, a heat recovery zone without burners 60 is set at the furnace entrance end, and the waste heat of the high-temperature flue gas can be used to heat the furnace blanks to reduce the exhaust temperature.

[0053] In an optional embodiment of the present invention, the width of the walking beam 10 and the width of the fixed beam 20 are generally above 500 mm, and the height of the walking beam 10 and the height of the fixed beam 20 are generally about 500 mm. The contact area between the walking beam 10 and the fixed beam 20 and the blank 200 is large, and the four sides of the blank 200 can be effectively heated. The heated blank 200 is not easy to deform at high temperature, which is conducive to improving the heating quality.

[0054] In an optional embodiment of the present invention, charging and discharging equipment 90 are respectively provided at both ends of the furnace.

[0055] The detailed explanation of the above-mentioned embodiments is only intended to explain the present invention so as to facilitate a better understanding of the present invention. However, these descriptions cannot be interpreted as limitations on the present invention for any reason. In particular, the various features described in different embodiments may also be arbitrarily combined with each other to form other embodiments. Unless there is a clear description to the contrary, these features should be understood to be applicable to any embodiment and are not limited to the described embodiments.

Claims

1. An energy-saving walking beam heating furnace, characterized in that: The energy-saving walking-beam heating furnace is provided with a plurality of walking beams and a plurality of fixed beams for supporting the heated blanks. The plurality of fixed beams are arranged in sequence and at intervals, and a walking beam is provided between two adjacent fixed beams. The walking beam comprises a supporting part, a first refractory brick layer and a first refractory fiber layer which are arranged in sequence, and the top of the supporting part can be in direct contact with the blanks.

2. The energy-saving walking beam heating furnace according to claim 1, characterized in that: The support part includes a support steel structure and a casting material body cast outside the support steel structure.

3. The energy-saving walking beam heating furnace according to claim 2, characterized in that: The castable body and the first refractory brick layer are fixedly connected via an interlocking structure.

4. The energy-saving walking beam heating furnace according to claim 1, characterized in that: The supporting part is a heat-resistant steel frame.

5. The energy-saving walking beam heating furnace according to claim 1, characterized in that: A heat-resistant supporting pad is arranged on the top of the supporting part.

6. The energy-saving walking beam heating furnace according to claim 1, characterized in that: A first fixing plate is provided at the bottom of the side wall of the walking beam, and the first fixing plate has a horizontal portion and a vertical portion which are vertically arranged. The horizontal portion is arranged on the lower surface of the refractory fiber layer, and the vertical portion is arranged on the sides of the first refractory fiber layer and the first refractory brick layer. The top end of the vertical portion is fixedly connected to the supporting portion.

7. The energy-saving walking beam heating furnace according to claim 1, characterized in that: The plurality of fixed beams are respectively fixedly arranged on the furnace bottom of the energy-saving walking beam heating furnace, and the furnace bottom is provided with a second refractory brick layer and a second refractory fiber layer.

8. The energy-saving walking beam heating furnace according to claim 7, characterized in that: The bottoms of the multiple walking beams pass through the furnace bottom and are connected to the walking mechanism. There is a gap between the side walls of each walking beam and the furnace bottom, and a water seal knife is arranged between the side walls of the walking beam and the furnace bottom. The walking mechanism is provided with multiple water seal grooves, and the bottoms of the water seal knives are inserted into the water seal grooves.

9. The energy-saving walking beam heating furnace according to claim 7, characterized in that: Each of the fixed beams and the furnace bottom is cast in one piece.

10. The energy-saving walking beam heating furnace according to claim 7, characterized in that: The fixed beam is a heat-resistant steel frame.

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