A walking beam furnace body for use with steel billet strip

Abstract

This utility model discloses a walking beam reheating furnace body for steel billet strip. The furnace body has settling troughs at the bottom and corresponding positions of the movable beams. These settling troughs are wider at the top and narrower at the bottom, with a rectangular or square cross-section and openings at both the top and bottom. The upper end of the settling trough is flush with the furnace bottom, and its lower end connects to a long trough. During the heating process, iron oxide scale that detaches from the billet rolls down the slope of the settling trough and enters the water seal trough through the long trough, thus preventing the accumulation of iron oxide scale within the furnace body. This utility model achieves efficient and stable discharge of slag from the furnace without the need for any additional slag removal machinery, effectively avoiding production stoppages caused by slag removal equipment malfunctions and improving the furnace's operating efficiency and reliability.

Description

Technical Field

[0001] This utility model belongs to the field of steel production equipment, and in particular relates to a walking beam heating furnace body for steel billet strip. Background Technology

[0002] The existing double-preheating regenerative walking beam furnace has an effective size of 46m*8.6m and uses blast furnace gas as fuel. Due to the different heating process for strip steel compared to bar and wire rod, higher temperature requirements result in a significant amount of iron oxide scale being produced on the billet. As the walking beam moves, the iron oxide scale detaches from the billet and accumulates at the furnace bottom. After four months, the excessive accumulation of iron oxide scale causes blockage of the lower burners, excessive gas consumption, and a change in burner flame direction, resulting in high temperatures at both ends of the billet and low temperatures in the middle, creating a large temperature difference. This leads to quality defects during rolling, increased coal consumption, and disruption of the rolling rhythm, necessitating furnace shutdown for cleaning. Furthermore, the rising oxide slag inside the furnace compresses the furnace space, increases furnace pressure, and causes overflow of furnace flames, resulting in damage to the furnace bottom, furnace door, and auxiliary equipment at the inlet and outlet (skirt, square box, water seal trough, roller conveyor, motor, furnace door steel structure), affecting the furnace's lifespan and safe, normal production. In existing technology, mechanical equipment such as tie rods and scrapers are added inside the furnace to push the steel slag to the slag discharge port. If the equipment fails, the only solution is to shut down the heating furnace. Utility Model Content

[0003] The purpose of this utility model is to provide a walking beam heating furnace body for steel billet strips, in order to solve the problems of iron oxide accumulation in the billet leading to blockage of the lower burner, excessive gas consumption, high temperature at both ends of the billet, increased furnace pressure, overflow of furnace fire, and burnout of furnace bottom, furnace door and auxiliary equipment at the furnace inlet and outlet.

[0004] This utility model adopts the following technical solution: a walking beam type heating furnace body for steel billet strip, comprising: a heating furnace body, in which a movable beam and a fixed beam are horizontally arranged; a fixed column is fixedly connected to the lower side of the fixed beam; a movable column is fixedly connected to the lower side of the movable beam; multiple parallel elongated slots are opened at the bottom of the heating furnace body along the length of the heating furnace body; each elongated slot is used for the lower end of the movable column to extend out of the heating furnace body and connect to the translation frame; the lower end of each elongated slot is used to extend into a water seal groove of an annular or U-shaped groove fixed on the translation frame; the water seal groove can move synchronously with the translation frame and the movable column; room temperature circulating water is continuously injected into the water seal groove, thereby causing the lower edge of the elongated slot to insert into the water in the water seal groove to form a water curtain sealing structure; each elongated slot is also used to provide a horizontal translation channel for the movable column to avoid the movable column from getting stuck. Settling troughs are provided at the bottom of the furnace body and at the corresponding positions of the movable beams. The settling troughs are wider at the top and narrower at the bottom, with a rectangular or square cross-section and open at both the top and bottom. The upper end of the settling trough is flush with the bottom of the furnace body, and its lower end is connected to the elongated trough. Each settling trough is used for the iron oxide scale that falls off the billet during the heating process to continuously roll down the slope of the settling trough and enter the water seal trough through the elongated trough, thereby preventing the iron oxide scale from accumulating in the furnace body.

[0005] The beneficial effects of this utility model are: This invention enables efficient and stable discharge of oxidized slag from the furnace without the need for any additional slag removal machinery, effectively avoiding production stoppages caused by slag removal equipment malfunctions and improving the operating efficiency and reliability of the heating furnace. This invention, by setting a settling tank and a slag discharge port, can simultaneously discharge the iron oxide scale generated by the billet into the furnace body, avoiding its accumulation in the furnace body, which would otherwise lead to problems such as burner blockage, excessive gas consumption, high billet temperature at both ends, increased furnace pressure, overflow of furnace fire, and damage to the furnace bottom, furnace door, and auxiliary equipment at the furnace inlet and outlet. Attached Figure Description

[0006] Figure 1 This is a top view of the present invention; Figure 2 This is a side view of the present invention.

[0007] Among them: 10. Heating furnace body; 11. Movable beam; 12. Fixed beam; 13. Preheating section; 14. Heating section 1; 15. Heating section 2; 16. Soaking section; 17. Burner nozzle; 18. Slag discharge port; 19. Settling tank; 20. Fixed column; 21. Movable column. Detailed Implementation

[0008] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0009] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "multiple" means two or more. The term "orientation" in this utility model refers to the orientation of the utility model within the... Figure 1 Description of the state's progression.

[0010] This utility model discloses a walking beam heating furnace body for use with steel billet strips, such as Figure 1 and Figure 2 As shown, the furnace includes: a heating furnace body 10, with a movable beam 11 and a fixed beam 12 horizontally arranged inside the heating furnace body 10. A fixed column 20 is fixedly connected to the lower side of the fixed beam 12, and a movable column 21 is fixedly connected to the lower side of the movable beam 11. Multiple parallel elongated slots are formed at the bottom of the heating furnace body 10 along its length. Each elongated slot allows the lower end of the movable column 21 to extend out of the heating furnace body 10 and connect to the translation frame. The lower end of each elongated slot extends into a water seal groove of an annular or U-shaped trough fixed on the translation frame. The water seal groove can move synchronously with the translation frame and the movable column 21. Room temperature circulating water is continuously injected into the water seal groove, thereby causing the lower edge of the elongated slot to insert into the water in the water seal groove to form a water curtain sealing structure. Each elongated slot also provides a horizontal translation channel for the movable column 21 to prevent the movable column 21 from getting stuck.

[0011] A settling trough 19 is provided at the bottom of the furnace body 10 and at the position corresponding to the movable beam 11. The settling trough 19 is a structure that is wider at the top and narrower at the bottom, with a rectangular or square cross-section and open at both the top and bottom. The upper end of the settling trough 19 is flush with the bottom of the furnace body 10, and its lower end is connected to the elongated trough. Each settling trough 19 is used for the iron oxide scale that falls off the billet during the heating process to continuously roll down from the slope of the settling trough 19 and enter the water seal trough through the elongated trough, thereby preventing the iron oxide scale from accumulating in the furnace body 10.

[0012] The heating furnace body 10 consists of a preheating section 13, a first heating section 14, a second heating section 15, and a heat soaking section 16 from left to right. Each settling tank 19 is located within the first heating section 14, the second heating section 15, and the heat soaking section 16.

[0013] A row of burner nozzles 17 is provided on both sides of the heating furnace body 10 along the width direction of the heating furnace body 10. A row of slag discharge ports 18 is provided on the bottom of the heating furnace body 10 near each row of burner nozzles 17. Each slag discharge port 18 is a structure that is wider at the top and narrower at the bottom, with a square or rectangular cross-section and open at both the top and bottom. The upper end of the slag discharge port 18 is flush with the bottom of the heating furnace body 10. The lower end of the slag discharge port 18 is connected to the long strip groove through a buffer groove. The slag discharge port 18 is used for the iron oxide scale that falls off the billet to continuously roll down from the slope of the slag discharge port 18 and flow out of the heating furnace body 10.

[0014] Each slag discharge port 18 is evenly distributed in the heat soaking section 16 and the heating section of the furnace body 10.

[0015] Preferably, the slope inclination angle of the settling tank 19 is 35 degrees. The slope inclination angle of the slag outlet 18 is 30 degrees. Example

[0016] A steel plant, due to the different heating process for strip steel compared to bar and wire rod, requires higher temperatures, resulting in a significant amount of iron oxide scale on the billets. As the walking beam moves, this scale detaches from the billets and accumulates at the furnace bottom. After four months, the excessive scale buildup clogs the lower burners, leading to excessive gas consumption and a change in burner flame direction. This results in high temperatures at both ends of the billet and a low temperature in the middle, creating a large temperature difference. This causes quality defects during rolling, increases coal consumption, and disrupts the rolling rhythm, necessitating a furnace shutdown for cleaning. Furthermore, the rising slag inside the furnace compresses the furnace space, increases furnace pressure, and causes overflow, damaging the furnace bottom, furnace doors, and auxiliary equipment such as skirts, square boxes, water seal troughs, roller conveyors, motors, and furnace door steel structures. This affects the furnace's lifespan and ensures safe and normal production. Current technology uses mechanical devices such as pull rods and scrapers to push slag to the slag discharge port, but equipment failure necessitates furnace shutdown.

[0017] The modification process is as follows: Settling trough 19: Along the centerline of the three rows of movable beams 11 at the bottom of the heating furnace, trapezoidal settling troughs 19 are constructed using clay bricks or precast blocks at the 36 movable beams 11 openings of the first heating section 14, the second heating section 15, and the soaking section 16, with the movable beam 11 as the center. The settling trough 19 is at a 35-degree angle to the furnace bottom, and its top surface is covered with a castable material with strong slag resistance and excellent sliding properties. Utilizing the acceleration effect of gravity on the inclined surface, the falling iron oxide scale can quickly slide into the water seal trough and be transferred to the slag flushing ditch for centralized hoisting and secondary resource utilization.

[0018] Slag discharge ports 18: Seven trapezoidal slag discharge ports 18 are symmetrically added on both sides of the burner bottom surface below the burner nozzle 17, along with dedicated slag discharge pipes. Through this modification, the iron oxide scale generated in the burner area can be directly guided to the furnace bottom through the slag discharge ports 18 and slag discharge pipes, forming a synergistic effect with the slag discharge system in the movable beam 11 area, achieving comprehensive and efficient discharge of iron oxide scale from the heating furnace.

[0019] By modifying the system, the slag cleaning frequency was extended from once every 6 months to once every 12 months of the year. This improved production efficiency while reducing the labor intensity of slag cleaning personnel, and simultaneously reduced refractory material consumption and maintenance costs. Less slag buildup in the furnace reduced the likelihood of burner blockage, improving the thermal efficiency of the gas and thus achieving the goal of reducing gas consumption.

[0020] This upgrade enabled efficient removal of slag from the heating furnace without the need for additional mechanical equipment, thus avoiding the problem of slag removal failure due to equipment malfunction.

[0021] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A walking beam reheating furnace body for use with steel billet strip, characterized in that, include: The heating furnace body (10) has a horizontally arranged movable beam (11) and a fixed beam (12). The fixed beam (12) is fixedly connected to a vertically arranged fixed column (20) on its lower side, and the movable beam (11) is fixedly connected to a vertically arranged movable column (21) on its lower side. The bottom of the heating furnace body (10) has multiple parallel elongated slots along its length. Each elongated slot is used for the lower end of the movable column (21) to extend out of the heating furnace body (10) and connect to the translation frame. The lower end of each elongated slot is used to extend into a ring or U-shaped structure fixed on the translation frame. Inside the water seal trough of the shaped trough, the water seal trough can move synchronously with the translation frame and the movable column (21). The water seal trough is continuously injected with room temperature circulating water, so that the lower edge of the long strip trough is inserted into the water in the water seal trough to form a water curtain wall sealing structure; each of the long strip troughs is also used to provide a horizontal translation channel for the movable column (21) to avoid the movable column (21) from getting stuck. The furnace bottom of the heating furnace body (10) and the position of the corresponding movable beam (11) are provided with settling troughs (19). The settling troughs (19) are wide at the top and narrow at the bottom, with a rectangular or square cross-section and open at both the top and bottom. The upper end of the settling troughs (19) is flush with the furnace bottom of the heating furnace body (10), and its lower end is connected to the long strip trough. Each settling trough (19) is used for the iron oxide scale that falls off the billet during the heating process to continuously roll down from the slope of the settling trough (19) and enter the water seal trough through the long strip trough, thereby preventing the iron oxide scale from accumulating in the heating furnace body (10).

2. The walking beam reheating furnace body for steel billet strip as described in claim 1, characterized in that, The heating furnace body (10) consists of a preheating section (13), a first heating section (14), a second heating section (15), and a heat equalization section (16) from left to right. Each of the settling tanks (19) is located in the first heating section (14), the second heating section (15), and the heat equalization section (16).

3. The walking beam reheating furnace body for steel billet strip as described in claim 1, characterized in that, A row of burner nozzles (17) is provided on both sides of the heating furnace body (10) along the width direction of the heating furnace body (10). A row of slag discharge ports (18) is provided on the bottom of the heating furnace body (10) near each row of burner nozzles (17). Each slag discharge port (18) is a structure that is wider at the top and narrower at the bottom, with a square or rectangular cross-section and open at both the top and bottom. The upper end of the slag discharge port (18) is flush with the bottom of the heating furnace body (10), and its lower end is connected to the long groove through the slag discharge pipe. The slag discharge port (18) is used for the iron oxide scale that falls off the billet to continuously roll down from the slope of the slag discharge port (18) and flow out of the heating furnace body (10).

4. The walking beam reheating furnace body for steel billet strip as described in claim 3, characterized in that, Each of the slag discharge ports (18) is evenly distributed in the heat soaking section (16) and heating section of the heating furnace body (10).

5. The walking beam reheating furnace body for steel billet strip as described in claim 1, characterized in that, The slope inclination angle of the settling trough (19) is 35 degrees.

6. The walking beam reheating furnace body for steel billet strip as described in claim 3, characterized in that, The slope inclination angle of the slag outlet (18) is 30 degrees.

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