Refractory lining for a furnace

Abstract

The utility model relates to steel pipe rolling processing technical field, concretely is a kind of heating furnace burner slagging structure, including the slagging part and the slag pipe being arranged in slagging hole from top to bottom, water seal groove, slag scraper, conveying belt and furnace slag hopper being sequentially arranged below slag pipe, slagging hole is set in the furnace bottom below heating furnace high-temperature section burner, slagging hole penetrates furnace bottom, and slag scraper is separately fixed on furnace bottom side wall and hangs in furnace bottom, and slag scraper includes power mechanism, transmission mechanism connected with power mechanism and the slag scraping plate being arranged on transmission mechanism. By setting slagging hole at furnace bottom below heating furnace burner, iron scale slag below burner can fall into water seal groove from slagging hole in time, so as to remove iron scale slag in time, no longer affect burner flame direction, solve the problem that iron scale is accumulated below heating furnace burner and blocks burner flame, realize that billet is heated evenly, reduce the oxidation burning loss rate of billet, improve the yield.

Description

Technical Field

[0001] This utility model relates to the field of steel pipe rolling technology, specifically to a slag discharge structure for a heating furnace burner. Background Technology

[0002] In the field of steel pipe rolling, steel billets are typically heated from room temperature to 1300℃ in a walking beam furnace, such as... Figure 1 As shown, there is a lot of iron oxide scale below the burners in the high-temperature section of the heating furnace, which easily accumulates. After a period of operation, the iron oxide scale will accumulate above the lower row of burners, changing the flame jet direction of the lower row of burners and affecting the heating quality of the steel billet and the oxidation loss rate. In the existing technology, the furnace is usually shut down for 6-7 days every six months to clean the accumulated iron oxide scale slag below the burners. This time is an unnecessary production shutdown, which restricts the continuity of steel pipe plant production and affects annual output. Secondly, because the iron oxide slag accumulates at the burner nozzles, it changes the flame jet direction of the burners, causing uneven heating of the steel billet, resulting in local overheating, prolonging the heating time, and increasing oxidation loss.

[0003] In addition, the existing furnace bottom movable beam's columns pass through the furnace bottom and are fixed to the translation frame. Based on the translation distance of the movable beam, an elongated oval opening is made in the furnace bottom. The column pipes pass through the perimeter of this opening, forming a ring of refractory material higher than the furnace bottom to prevent slag from falling into the water seal trough. Since a small amount of iron oxide scale slag falls into the water seal trough, a scraper is installed below the skirt-type water seal blade. During the upward and forward movement of the movable beam, the iron oxide scale slag is scraped towards the charging end at the furnace tail. This type of scraper can only move with the furnace bottom movable beam and cannot adjust its speed; it can only scrape away a small amount of iron oxide scale slag that falls into the water seal trough. Therefore, it is urgent to install a slag discharge structure at the furnace burner location to remove the iron oxide scale slag under the burner while the furnace is running continuously. Utility Model Content

[0004] The purpose of this invention is to provide a slag removal structure for the burner of a walking beam furnace, which is used for removing iron oxide scale from the furnace. This structure enables timely removal of iron oxide scale below the burner and can scrape off a large amount of iron oxide scale in the water seal trough, thus solving the problem of iron oxide scale accumulating below the burner and blocking the burner flame.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a slag discharge structure for a heating furnace burner, comprising a slag discharge section and a slag discharge pipe arranged from top to bottom in a slag discharge hole, a water seal trough arranged sequentially below the slag discharge pipe, a slag scraper, a conveyor belt, and an external slag hopper. The slag discharge hole is located at the furnace bottom below the burner in the high-temperature section of the heating furnace, and the slag discharge hole penetrates the furnace bottom. The slag scraper is separately fixed to the side wall of the furnace bottom and suspended from the furnace bottom. The slag scraper includes a power mechanism, a transmission mechanism connected to the power mechanism, and a scraper plate arranged on the transmission mechanism. The power mechanism drives the scraper plate to move so as to scrape the iron oxide scale slag in the water seal trough onto the conveyor belt below, and then the iron oxide scale slag is transported to the external slag hopper through the conveyor belt.

[0006] Based on the above technical solution, the present invention can be further improved as follows: As a further improvement to the above technical solution, a slag discharge section and a slag lowering pipe are constructed sequentially from top to bottom inside the slag discharge hole. A conical hole is provided through the slag discharge section from top to bottom, and the conical hole is connected to the slag lowering pipe. The diameter of the conical hole is set to gradually decrease from top to bottom.

[0007] As a further improvement to the above technical solution, the slag discharge hole is constructed by first laying refractory material and then inserting the slag discharge pipe, and the furnace bottom is lined with refractory material inside the slag discharge hole.

[0008] As a further improvement to the above technical solution, the slag discharge pipe adopts a heat-resistant and corrosion-resistant sleeve. The slag discharge pipe is equipped with an upper flange and a lower flange so that the slag discharge pipe can be disassembled and replaced. The upper flange is integrated with the refractory material lining the furnace bottom.

[0009] As a further improvement to the above technical solution, the slag discharge pipe is provided with an observation window on its peripheral wall. The observation window is fitted with glass, which is made of high-temperature resistant glass, and is located near the slag discharge section.

[0010] As a further improvement to the above technical solution, the lower end of the slag discharge pipe extends into the water seal trough, which is flat-bottomed and has a fixed steel support structure. The water seal trough is provided with an inclined sidewall with an inclination angle of 45-60 degrees relative to the horizontal plane. The lower end of the slag discharge pipe is located close to the inclined sidewall to facilitate the iron oxide slag to slide down along the inclined sidewall.

[0011] As a further improvement to the above technical solution, the slag scraper is a chain-type electric slag scraper, the power mechanism is a drive motor, the transmission mechanism includes a main drive shaft, a driven drive shaft, two drive sprockets and a transmission chain, a reducer is provided between the drive motor and the main drive shaft, one end of the main drive shaft is connected to the output shaft of the reducer through a transmission component, the two drive sprockets are respectively sleeved on the main drive shaft and the driven drive shaft, the transmission chain is wound around the two drive sprockets, and multiple slag scrapers are provided, with the multiple slag scrapers equally spaced on the transmission chain.

[0012] As a further improvement to the above technical solution, a water tank is provided inside the water seal tank, a bearing seat 1 is provided at the top of the water tank, the two ends of the main drive shaft are connected to the bearing seat 1, a bearing seat 2 is provided on the inner wall of the water tank, and the two ends of the drive shaft are connected to the bearing seat 2; the transmission component is a sprocket connected to one end of the main drive shaft and a chain sleeved on the sprocket.

[0013] As a further improvement to the above technical solution, the conveyor belt is used to transport the iron oxide slag scraped out by the slag scraper to the slag hopper outside the furnace. The conveyor belt is fitted on two drive rollers, one of which is connected to a motor.

[0014] As a further improvement to the above technical solution, the iron oxide slag falls into the water seal trough along the slag discharge hole, and then the iron oxide slag in the water seal trough is scraped onto the conveyor belt below by the scraper of the slag scraper. The iron oxide slag is then transported to the slag hopper outside the furnace by the conveyor belt. The conveyor belt is set at an inclination angle of 45-60 degrees relative to the horizontal plane.

[0015] The beneficial effects of this utility model are: 1. This utility model solves the problem of iron oxide scale slag blocking the burner flame by setting a slag discharge hole at the bottom of the furnace below the burner. This ensures that the burner flame jet and combustion direction are in accordance with the process requirements, achieves uniform heating of the billet from top to bottom, and enables the billet temperature to reach the furnace tapping requirements quickly. This reduces the oxidation loss rate of the billet and improves the yield. 2. The slag scraper no longer moves with the movable beam at the bottom of the furnace, but instead forms a slag scraper with the power mechanism and transmission mechanism as an independent operating mechanism. The power mechanism drives the slag scraper to scrape off the iron oxide scale slag in the water seal trough. The slag scraper is no longer pulled by the movable beam at the bottom of the furnace. In this way, the scraping speed can be adjusted at any time according to the amount of iron oxide scale slag, which is suitable for scraping off a large amount of iron oxide scale slag. 3. The cleaning cycle of iron oxide in the heating furnace has been extended from 6 months to 12 months, enabling continuous production for one year without having to shut down the furnace to clean iron oxide scale. The furnace will be shut down for cleaning iron oxide scale during the year-end overhaul, saving 7 days of mid-year slag cleaning time each year. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 The image shows the technical problems existing in current heating furnace burners; Figure 2 This is a schematic cross-sectional view of the slag discharge structure of the burner in the heating furnace provided in a preferred embodiment of the present invention; Figure 3 yes Figure 2 Enlarged view of section A; Figure 4 yes Figure 2 A schematic diagram of the structure of the water seal tank equipped with a slag scraper; Figure 5 yes Figure 2 A schematic diagram of the conveyor belt and the slag hopper outside the furnace; In the diagram: 1. Burner; 2. Slag discharge section; 21. Conical hole; 3. Slag discharge pipe; 30. Observation window; 4. Water seal trough; 5. Slag scraper; 51. Drive motor; 52. Main drive shaft; 521. Bearing housing one; 53. Driven drive shaft; 531. Bearing housing two; 54. Drive sprocket; 55. Drive chain; 56. Slag scraper; 571. Sprocket; 572. Chain; 58. Reducer; 59. Water tank; 6. Conveyor belt; 61. Drive roller; 7. Slag hopper outside the furnace. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. These drawings are simplified schematic diagrams, which are only used to illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0019] 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 based on the orientation or positional relationships shown in the accompanying drawings, 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," "second," etc., 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, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] like Figures 2 to 5 As shown, a preferred embodiment of this utility model provides a slag discharge structure for a heating furnace burner, comprising, from top to bottom, a slag discharge section 2 and a slag discharge pipe 3 arranged in a slag discharge hole, a water seal trough 4 arranged below the slag discharge pipe 3, a slag scraper 5, a conveyor belt 6, and an external slag hopper 7. The slag discharge hole is located at the furnace bottom below the burner 1 in the high-temperature section of the heating furnace, and the slag discharge hole penetrates the furnace bottom. The slag scraper is separately fixed to the side wall of the furnace bottom and suspended from the furnace bottom. The slag scraper 5 includes a power mechanism, a transmission mechanism connected to the power mechanism, and a scraper plate 56 arranged on the transmission mechanism. The power mechanism drives the scraper plate 56 to move so as to scrape the iron oxide scale slag in the water seal trough 4 to the conveyor belt 6 below, and then the iron oxide scale slag is transported to the external slag hopper 7 through the conveyor belt 6.

[0022] Specifically, when opening the slag discharge hole at the furnace bottom, the furnace bottom beam position is avoided. The diameter of the slag discharge hole is about 800-350mm and it is a conical hole. The diameter of the slag discharge pipe 3 is set to 273mm.

[0023] Specifically, in this embodiment, a slag discharge section 2 and a slag discharge pipe 3 are constructed sequentially from top to bottom inside the slag discharge hole. A conical hole 21 is provided through the slag discharge section 2 from top to bottom. The conical hole 21 is connected to the slag discharge pipe 3. The diameter of the conical hole 21 is set to gradually decrease from top to bottom to facilitate the discharge of iron oxide scale slag.

[0024] Optionally, the slag discharge hole can be constructed by first lining it with refractory material and then inserting the slag discharge pipe 3, with the furnace bottom lined with refractory material inside the slag discharge hole. Further, the slag discharge pipe 3 is equipped with an upper flange and a lower flange, allowing for easy removal and replacement of the slag discharge pipe 3; the upper flange is integrated with the refractory material lining the furnace bottom.

[0025] Preferably, the slag discharge pipe 3 is made of heat-resistant and corrosion-resistant sleeve; more preferably, the slag discharge pipe 3 is made of 304 stainless steel.

[0026] Furthermore, the slag discharge pipe 3 is provided with an observation window 30 on its surrounding wall. The observation window 30 is fitted with glass, which is made of high-temperature resistant glass. The observation window 30 is located near the slag discharge section 2. The situation inside the furnace can be observed through the glass of the observation window 30. The nearby iron oxide scale slag can be cleaned by opening the observation window 30.

[0027] Specifically, in this embodiment, the lower end of the slag discharge pipe 3 extends into the water seal trough 4. The water seal trough 4 is flat-bottomed, 500mm high and 700mm wide, and is made of 304 stainless steel. A steel support frame made of Q355B is fixedly installed in the water seal trough 4. The water seal trough 4 is provided with an inclined sidewall with an inclination angle of 45-60 degrees relative to the horizontal plane. The lower end of the slag discharge pipe 3 is located close to this inclined sidewall to facilitate the iron oxide slag to slide down along the inclined sidewall.

[0028] Specifically, in this embodiment, as Figure 4As shown, the slag scraper 5 is a chain-type electric slag scraper, the power mechanism is a drive motor 51, and the transmission mechanism includes a main drive shaft 52, a driven drive shaft 53, two drive sprockets 54, and a drive chain 55. A water tank 59 is provided inside the water seal tank 4. The water tank 59 is made of stainless steel, and a bearing seat 521 is provided on the top of the water tank 59. Both ends of the main drive shaft 52 are connected to the bearing seat 521. A second bearing seat 531 is provided on the inner wall of the water tank 59, and both ends of the driven drive shaft 53 are connected to the second bearing seat 531. A reducer 58 is provided between the drive motor 51 and the main drive shaft 52, and one end of the main drive shaft 52 is connected to the output shaft of the reducer 58 via a transmission component. The transmission component may be a sprocket 571 connected to one end of the main drive shaft 52 and the driven shaft 53, and a chain 572 sleeved on the sprocket 571. Two transmission sprockets 54 are respectively sleeved on the main drive shaft 52 and the driven shaft 53, and a transmission chain 55 is wound around the two transmission sprockets 54.

[0029] Multiple scraper plates 56 are provided, and are equidistantly arranged on the transmission chain 55. The scraper plates 56 are made of 304 stainless steel. The drive motor 51 drives the main drive shaft 52, the driven drive shaft 53, and the drive sprocket 54 to rotate, thereby driving the multiple scraper plates 56 on the transmission chain 55 to move. During the movement of the scraper plates 56 in the water seal tank 4, they scrape the iron oxide scale slag in the water seal tank 4 onto the conveyor belt 6 below, and then the conveyor belt 6 transports the iron oxide scale slag to the slag hopper 7 outside the furnace. The speed of the drive motor 51 can be adjusted according to the amount of iron oxide scale slag, thereby adjusting the scraping speed of the scraper plates 56.

[0030] Specifically, in this embodiment, the external slag hopper 7 is welded from Q235B plates, and the conveyor belt 6 is used to transport the iron oxide scale slag scraped off by the slag scraper 5 to the external slag hopper 7. Preferably, as follows... Figure 5 As shown, the conveyor belt 6 is mounted on two drive rollers 61. One of the drive rollers 61 is connected to a motor. The motor drives the conveyor belt 6 to move and transport the iron oxide scale slag to the slag hopper 7 outside the furnace. The conveyor belt 6 is set at an angle of 45-60 degrees relative to the horizontal plane.

[0031] In implementing this utility model, firstly, a slag discharge hole is opened at the bottom of the furnace below the burner 1 in the high-temperature section of the heating furnace. The slag discharge hole penetrates the bottom of the furnace. When opening the slag discharge hole, it is necessary to avoid the position of the furnace bottom beam to ensure that the load-bearing strength of the heating furnace is not affected. Then, a slag discharge section 2 with a conical hole 21 is built in the slag discharge hole, and the slag discharge pipe 3 is built together. The slag discharge pipe 3 is flanged, the lower part is detachable and replaceable, and the upper part is integrated with the refractory material built into the furnace bottom. The lower part of the slag discharge pipe 3 is inserted into the water seal trough 4 for sealing. The iron oxide scale slag falls into the water seal trough 4 along the conical hole 21 and the slag discharge pipe 3. The drive motor 51 drives the scraper 56 to move continuously to scrape away the iron oxide scale slag falling from the slag discharge pipe 3 into the water seal trough 4. The scraped iron oxide scale slag falls onto the conveyor belt 6 and is transported to the slag hopper 7 outside the furnace by the conveyor belt 6.

[0032] The beneficial effects of this utility model are: 1. This utility model provides a slag discharge hole at the bottom of the furnace below the burner 1. The iron oxide scale slag below the burner 1 can fall into the water seal tank 4 in a timely manner, thus removing the iron oxide scale slag in time. This prevents the lower burner 1 nozzle from being buried and affects the flame jet direction, avoiding localized high temperature overheating. It also enhances the uniformity of furnace temperature, which is beneficial to improving the heating quality of steel billets. It solves the problem of iron oxide scale slag accumulating below the burner 1 and blocking the flame of the burner 1, ensuring that the flame jet and combustion direction of the burner 1 burn according to the process requirements. This achieves uniform heating of the steel billet from top to bottom, and the steel billet temperature quickly reaches the furnace tapping requirements, reducing the oxidation loss rate of the steel billet and improving the yield. 2. The slag scraper 56 no longer moves with the movable beam at the bottom of the furnace, but instead forms a slag scraper 5 with the power mechanism and transmission mechanism as an independent operating mechanism. The power mechanism drives the slag scraper 56 to scrape off the iron oxide scale slag in the water seal trough 4. The slag scraper 56 is no longer pulled by the movable beam at the bottom of the furnace. In this way, the scraping speed can be adjusted at any time according to the amount of iron oxide scale slag, which is suitable for scraping off a large amount of iron oxide scale slag. 3. The cleaning cycle of iron oxide scale and slag in the heating furnace has been extended from 6 months to 12 months, enabling continuous production for one year without having to shut down the furnace to clean iron oxide scale and slag. The furnace will be shut down to clean the iron oxide scale in the furnace during the year-end overhaul. This will save cleaning time every year and result in a significant increase in production and revenue.

[0033] Any descriptions not covered in the above specific embodiments of this utility model belong to the well-known technology in the field, and can be implemented by referring to the well-known technology.

[0034] Based on the preferred embodiments of this utility model described above, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A slag discharge structure for a heating furnace burner, characterized in that: The furnace includes, from top to bottom, a slag discharge section and a slag discharge pipe arranged inside the slag discharge hole, a water seal trough arranged below the slag discharge pipe, a slag scraper, a conveyor belt, and an external slag hopper. The slag discharge hole is located at the furnace bottom below the burner in the high-temperature section of the heating furnace and extends through the furnace bottom. The slag scraper is separately fixed to the side wall of the furnace bottom and suspended from the furnace bottom. The slag scraper includes a power mechanism, a transmission mechanism connected to the power mechanism, and a scraper plate arranged on the transmission mechanism. The power mechanism drives the scraper plate to move so as to scrape the iron oxide scale slag in the water seal trough onto the conveyor belt below, and then the iron oxide scale slag is transported to the external slag hopper through the conveyor belt.

2. The slag discharge structure for the heating furnace burner according to claim 1, characterized in that: The slag discharge hole is constructed from top to bottom with a slag discharge section and a slag discharge pipe. The slag discharge section has a conical hole running through it from top to bottom. The conical hole is connected to the slag discharge pipe, and the diameter of the conical hole is set to gradually decrease from top to bottom.

3. The slag discharge structure for the burner of the heating furnace according to claim 1, characterized in that: The slag discharge hole is constructed by first laying refractory material and then inserting the slag discharge pipe, and the furnace bottom is lined with refractory material inside the slag discharge hole.

4. The slag discharge structure for the heating furnace burner according to claim 3, characterized in that: The slag discharge pipe adopts a heat-resistant and corrosion-resistant sleeve. The slag discharge pipe is equipped with an upper flange and a lower flange so that the slag discharge pipe can be disassembled and replaced. The upper flange is integrated with the refractory material lining the furnace bottom.

5. The slag discharge structure for the heating furnace burner according to claim 4, characterized in that: The slag discharge pipe is provided with an observation window on its peripheral wall. The observation window is fitted with glass, which is made of high-temperature resistant glass, and is located near the slag discharge section.

6. The slag discharge structure for the heating furnace burner according to claim 1, characterized in that: The lower end of the slag discharge pipe extends into the water seal trough, which is flat-bottomed and is fixedly supported by a steel structure. The water seal trough has an inclined sidewall with an inclination angle of 45-60 degrees relative to the horizontal plane. The lower end of the slag discharge pipe is located close to the inclined sidewall to facilitate the iron oxide slag to slide down along the inclined sidewall.

7. The slag discharge structure for the burner of the heating furnace according to claim 1, characterized in that: The slag scraper is a chain-type electric slag scraper. The power mechanism is a drive motor. The transmission mechanism includes a main drive shaft, a driven drive shaft, two drive sprockets, and a transmission chain. A reducer is installed between the drive motor and the main drive shaft. One end of the main drive shaft is connected to the output shaft of the reducer through a transmission component. The two drive sprockets are respectively sleeved on the main drive shaft and the driven drive shaft. The transmission chain is wound around the two drive sprockets. Multiple slag scrapers are provided, and the multiple slag scrapers are equidistantly spaced on the transmission chain.

8. The slag discharge structure for the burner of the heating furnace according to claim 7, characterized in that: The water seal groove is provided with a water tank, and a bearing seat is provided at the top of the water tank. The two ends of the main drive shaft are connected to the bearing seat. The inner wall of the water tank is provided with a bearing seat, and the two ends of the driven shaft are connected to the bearing seat. The transmission component is a sprocket connected to one end of the main drive shaft and a chain sleeved on the sprocket.

9. The slag discharge structure for the heating furnace burner according to claim 8, characterized in that: The conveyor belt is used to transport the iron oxide slag scraped off by the slag scraper to the slag hopper outside the furnace. The conveyor belt is fitted on two drive rollers, one of which is connected to a motor.

10. The slag discharge structure for the burner of the heating furnace according to claim 1, characterized in that: The iron oxide slag falls into the water seal trough along the slag discharge hole, and then the iron oxide slag in the water seal trough is scraped by the slag scraper to the conveyor belt below. The iron oxide slag is then transported to the slag hopper outside the furnace by the conveyor belt. The conveyor belt is set at an inclination angle of 45-60 degrees relative to the horizontal plane.

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