Flue structure for connecting top-blown furnace and boiler
By designing a flue structure connecting the top blower and the boiler, a square-variable round interface housing, a straight flue housing and a boiler interface housing are used, and a negative pressure monitoring interface is set on the flue cover, the flue is solved The problems of easy coking and short life of refractory bricks have achieved the effect of extending the life of flue, reducing maintenance costs and stable production.
Patent Information
- Application Number
- CN202420955920.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-06
- Publication Date
- 2025-02-07
- Estimated Expiration
- 2034-05-06
AI Technical Summary
During the ignition smelting process, the flue is prone to coking, causing blockage or the boiler's imported coking curtains, affecting the pressure in the furnace. The commonly used refractory brick flue is low in compressive strength, short life and high maintenance costs.
A flue structure connecting the top blower and the boiler is designed, using a square-variable round interface shell, a straight flue shell and a boiler interface shell, a cooling system is installed on the outer surface, and a negative pressure monitoring is installed on the flue cover. Interface, monitor and control the negative pressure in the flue in real time.
By reducing the burn damage of refractory bricks, the life of the flue is extended, the maintenance cost and difficulty is reduced, the production process is stabilized, and the reliability and safety of the flue is improved through the cooling system and the negative pressure monitoring system.
Smart Images
Figure CN222438560U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of copper pyrometallurgy, in particular to a flue structure connecting a top-blown furnace and a boiler. Background Art
[0002] Pyrometallurgy is a smelting method in which the charge is directly added or flows into a blasted molten pool to quickly complete the main reactions between gas, liquid and solid phases. The high-temperature flue gas after the reaction enters the boiler through the flue, and is sent to the boiler of the acid-making system through the flue when the temperature reaches the required level.
[0003] During the smelting process, the blast will blow a large amount of high-temperature molten material into the subsequent flue, causing serious coking of the flue, blocking the flue or coking curtains at the boiler inlet, affecting the pressure in the furnace. Currently, the commonly used smelting furnace flues are mainly in two forms: refractory brick structure and membrane wall structure. For the smelting furnace flue with refractory brick structure, the conventional refractory brick flue has low compressive strength and can only deal with flue coking by high-temperature melting. Usually, the flue gas temperature is heated by burning diesel or natural gas to melt the coke. The smelting temperature plus the combustion temperature will cause the flue gas temperature to rise sharply, resulting in severe scouring of the refractory bricks, resulting in a shortened flue life. Utility Model Content
[0004] The utility model aims to provide a flue structure connecting a top-blown furnace and a boiler, so as to reduce the degree of burning of refractory bricks to a minimum, increase the life of the flue, and reduce maintenance costs and difficulty.
[0005] To achieve the above purpose, the technical solution of the utility model is as follows:
[0006] A flue structure connecting a top-blown furnace and a boiler, comprising a shell, a masonry, and a flue cover, wherein the flue structure connects the top-blown furnace and the boiler of an acid-making system, and is characterized in that: the shell comprises a square-to-round interface shell, a straight flue shell, and a boiler interface shell; a first cooling system is installed on the outer surface of the square-to-round interface shell, and a first masonry is built inside; the straight flue shell is a cylindrical structure, a second cooling system is installed on the outer surface of the straight flue shell, an oil burning port is opened, and a second masonry is built inside; a supporting corbel is installed on the outer surface of the boiler interface shell, and an observation port and a bonding processing port are opened, and a third masonry is built inside the boiler interface shell; the masonry is refractory bricks, ramming materials or castables; the flue cover is composed of more than two cover plates, a third cooling system is installed on the outer surface of the flue cover, and a negative pressure monitoring interface is opened, the negative pressure monitoring interface is connected to the negative pressure monitoring device, and a fourth masonry is built on the inner surface of the flue cover; the flue cover is installed on the top of the connection between the boiler interface shell and the boiler. Furthermore, the cover plates constituting the flue cover can be of different sizes or the same size. Preferably, the square-to-round interface shell is formed by welding 8 pieces of 304 stainless steel plates.
[0007] Furthermore, the first cooling system on the outer surface of the square-to-circle interface shell is composed of 2-8 groups of water cooling elements, which are fixed on the flat plate of the square-to-circle interface shell, and the water cooling elements can be cooled by water individually or in series. Preferably, the first cooling system on the square-to-circle interface shell is composed of 8 groups of water cooling elements.
[0008] Furthermore, the second cooling system on the outer surface of the straight flue shell is composed of 2-4 groups of water cooling elements, which are fixed on the straight flue shell. The water cooling elements can be cooled by water individually or in series. Preferably, the second cooling system of the straight flue shell is composed of 4 groups of water cooling elements, which are distributed in each area of the straight flue shell divided into four equal parts.
[0009] Furthermore, the second masonry inside the straight flue shell is formed of refractory bricks and ramming materials: the inner surface of the straight flue shell is laid with refractory bricks, and ramming materials are filled between the straight flue shell and the refractory bricks. The refractory bricks are trapezoidal, and the large ends of the trapezoidal refractory bricks are close to the straight flue shell. Furthermore, the refractory bricks are selected to be 275mm thick refractory bricks, and 25mm thick ramming materials are filled and rammed between the straight flue shell and the refractory bricks. The refractory bricks are made of directly bonded chromium-magnesium, and the ramming materials are made of magnesia. Furthermore, at least two brick support plates are installed and welded along the circumferential direction inside the straight flue shell. The brick support plates are made of stainless steel, and their positions can be adjusted according to the height of the flue. Preferably, the brick support plates are made of 304 stainless steel.
[0010] Furthermore, the boiler interface shell is a combination of a semicircle, a half square turned into a circle and a straight steel plate welded together, and a reinforcing rib is welded on the straight steel plate of the boiler interface shell
[0011] Furthermore, the third masonry inside the boiler interface shell includes masonry inside the straight steel plate, masonry inside the half-square-circle, and masonry inside the semicircle. Anchors are welded on the inner wall of the straight steel plate and the half-square-circle of the boiler interface shell. The anchors and the inner wall of the straight steel plate and the half-square-circle of the boiler interface shell are V-shaped. The masonry inside the straight steel plate and the half-square-circle is formed by castables, and the castable material is chromium-aluminum steel fiber reinforced casting material; the masonry inside the semicircle is formed by refractory bricks and ramming materials. The inner surface of the semicircle is laid with refractory bricks, and ramming materials are filled between the semicircle and the refractory bricks. Furthermore, 200mm thick castables are poured inside the straight steel plate and the half-square-circle of the boiler interface shell.
[0012] Furthermore, the third cooling system of the outer surface of the flue cover is composed of water cooling elements, and each cover plate constituting the flue cover is equipped with a water cooling element, and the water cooling element is fixed on the outer surface of the cover plate of the flue cover. The water cooling element can be cooled by water individually or in series.
[0013] Furthermore, anchors are welded on the inner wall of the square-to-round interface shell and the flue cover, and the anchors and the inner wall of the square-to-round interface shell and the inner wall of the flue cover are V-shaped. The first masonry and the second masonry inside the square-to-round interface shell and the flue cover are respectively formed by casting materials, and the casting material is chromium-aluminum steel fiber reinforced casting material. Furthermore, the anchors are arranged equidistantly, and the square-to-round interface shell or the flue cover is cast with a thickness of 300 mm to form a masonry.
[0014] Furthermore, the water-cooling element is a multi-turn passage formed by connecting stainless steel angle steels end to end, and end plates are welded at both ends of the passage to block the passage, and flange joints are respectively installed on the angle steels near the end plates at both ends. Furthermore, in the first cooling system of the square-to-circular interface shell, the transverse stainless steel angle steels in the water-cooling element are parallel to each other and have equal spacing; in the second cooling system of the straight flue shell, the longitudinal stainless steel angle steels in the water-cooling element are parallel to each other and have equal spacing. The flange joint is welded and installed on the angle steel 50mm away from the end plate.
[0015] Furthermore, the first, second and third cooling systems are connected to a cooling circulating water system through flange joints, including a water supply pipeline, a return pipeline and a water supply device; a pneumatic ball valve and a manual ball valve are sequentially arranged on the water supply pipeline along the water flow direction, and the pneumatic ball valve is connected to a DCS control system, i.e., a distributed control system; a manual copper gate valve and a return water temperature monitoring device are arranged on the return pipeline. Furthermore, the water supply pipeline is externally connected to a water supply device, a manual ball valve is arranged above the water tank of the water supply device, and a pneumatic ball valve is arranged near the water supply pipeline.
[0016] The beneficial effects of the utility model are:
[0017] (1) The flue structure connecting the top-blown furnace and the boiler disclosed in the utility model comprises a vertical plus horizontal structure. Generally, coking will not occur in the vertical section, but coking will occur mostly at the interface between the flue and the boiler, i.e., near the flue cover. A negative pressure monitoring interface is provided on the flue cover, and a negative pressure monitor is connected to display the negative pressure data in the flue in real time. When the negative pressure reaches a certain value, it indicates that the interface between the boiler and the flue is sticky or hanging, and immediate treatment is required to prevent the production from being affected. After the air is stopped, the observation port can be opened to visually observe the situation in the flue. If hanging is found, the bonding treatment port is opened for manual treatment, thereby avoiding the economic loss caused by direct burning of oil and saving costs.
[0018] (2) The utility model discloses a flue structure for connecting a top-blown furnace and a boiler. When manual processing is impossible, the flue structure is bonded by burning diesel or natural gas. A cooling system is added to the outside of the square-to-round interface shell and the straight flue in the flue structure. The cooling system is a multi-turn passage composed of stainless steel angle steels connected end to end. The contact area between the cooling water passage and the shell surface is large, and the cooling effect is good. At the same time, the cooling system is provided with return water temperature monitoring. When burning diesel or natural gas, the frequency of the combustion process is controlled by monitoring the return water temperature, thereby reducing the degree of burnt damage of refractory bricks to a minimum and improving the life of the flue.
[0019] (3) The flue structure of the commonly used top-blown furnace is mostly arranged vertically and horizontally. During the smelting process, the high-temperature flue gas directly acts on the flue cover through the flue and then enters the boiler horizontally. In this process, the flue cover is under great challenges and is prone to deformation and burning, which shortens the life of the flue cover and affects production. The flue structure connecting the top-blown furnace and the boiler disclosed in the utility model is provided with a cooling system at the top of the flue. The cooling system is provided with a return water temperature monitoring system, which monitors the return water temperature in real time to control the inlet and outlet water flow rates, thereby reducing the burning of the refractory material of the flue cover, increasing the life of the flue cover, stabilizing production, reducing maintenance costs, and reducing the labor intensity of workers.
[0020] (4) The cooling system in the flue structure connecting the top-blown furnace and the boiler disclosed in the utility model is connected to the cooling circulating water system. On the one hand, when a circulating water leakage occurs on site and creates a safety risk, the manual ball valve in the water supply passage of the cooling circulating water system can be closed nearby or the pneumatic ball valve can be closed remotely depending on the on-site situation. On the other hand, the manual copper gate valve can be adjusted according to actual needs to control the cooling water flow of the water-cooled element. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 The three views of the flue structure connecting the top-blown furnace and the boiler disclosed in the utility model;
[0022] Figure 2 The utility model discloses a front view and a top view of a square-to-round interface shell in a flue structure connecting a top-blown furnace and a boiler;
[0023] Figure 3 It is a front view and a top view of a straight flue shell in a flue structure connecting a top-blown furnace and a boiler disclosed in the utility model;
[0024] Figure 4 It is a front view and a top view of a boiler interface shell in a flue structure for connecting a top-blown furnace and a boiler disclosed in the utility model;
[0025] Figure 5 It is a diagram of the water cooling element disclosed in the utility model;
[0026] Among them, 1—square to round interface shell, 2—cooling system, 3—anchor nail, 4—straight flue shell, 5—oil burning port, 6—brick support plate, 7—boiler interface shell, 8—support corbel, 9—observation port, 10—bonding treatment port, 11—reinforcement rib, 12—negative pressure monitoring interface, 13—flue cover, 14—first masonry, 15—second masonry, 16—third masonry, 17—fourth masonry, 18—end plate, 19—flange joint, 20—water cooling element, 21—first cooling system, 22—second cooling system, 23—third cooling system, 24—flange interface, 25—reinforcement rib plate. DETAILED DESCRIPTION
[0027] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the scope of the utility model.
[0028] Reference Figure 1-5 , a flue structure connecting a top-blown furnace and a boiler, comprising a shell 1, 4, 7 and masonry 14, 15, 16, 17 and a flue cover 13 made of steel. The shell comprises a square-to-round interface shell 1, a straight flue shell 4, and a boiler interface shell 7; the square-to-round interface shell 1 is provided with a first cooling system 21 on its outer surface, and a first masonry 14 is provided inside; the straight flue shell 4 is provided with a second cooling system 22 and an oil burning port 5 on its outer surface, and a second masonry 15 is provided inside; the boiler interface shell 7 is provided with a supporting corbel 8, an observation port 9 and a bonding port 10 on its outer surface, and a third masonry 16 is provided inside. The square-to-round interface shell 1, the straight flue shell 4 and the boiler interface shell 7 are connected by welding to form the flue structure; the masonry 14, 15, 16, 17 are made of refractory bricks, ramming materials or casting materials; the flue cover 13 is installed on the top of the connection between the boiler interface shell 7 and the boiler. The flue cover 13 is composed of at least two covers of different sizes or the same size, and a third cooling system 23 and a negative pressure monitoring interface 12 are installed on the outer surface of the flue cover.
[0029] Reference Figure 2The square-to-circular interface shell 1 is composed of 8 pieces of 304 stainless steel plates welded together. The bottom (side) of the square-to-circular interface shell is horizontally welded with a flange interface 24. The material of the flange interface 24 is stainless steel. The flange interface 24 is specifically a square or rectangular plate-type flat-welded flange interface. The specific size of the outer circumference of the flange interface 24 is determined according to the bottom size of the square-to-circular interface shell, and the inner circumference size of the flange interface 24 is determined according to the thickness of the first masonry. A reinforcing rib plate 25 is welded on the surface of the flange interface 24 facing the flue. The reinforcing rib plate 25 is also welded to the inner wall surface of the square-to-circular interface shell. The spacing between the reinforcing rib plates 25 is not less than 300 mm. The reinforcing rib plate 25 plays a role in strengthening the connection between the flange interface 24 and the square-to-circular interface shell, and the flange interface 24 plays a role in supporting the first masonry. The outer surface of the square-to-circle interface shell is provided with a first cooling system 21 composed of water-cooling elements 20: a multi-turn passage composed of several 5#*6mm thick stainless steel angle steels connected end to end according to the plate area, wherein the transverse angle steels are arranged in parallel with a spacing of 150mm, and the stainless steel angle steels are installed on the square-to-circle interface shell 1 by welding. After the stainless steel angle steel forms a passage, end plates 18 are welded at both ends to block them. After blocking, a flange joint 19 is welded and installed on each angle steel 50mm away from the end plates to form a group of water-cooling elements 20. The first cooling system 21 installed on the square-to-circle interface shell 1 is composed of 2-8 groups of water-cooling elements 20, and the 2-8 groups of water-cooling elements are respectively installed on the centrally symmetrical stainless steel plates of 8 stainless steel plates. When there are 8 groups of water-cooling elements, each of the 8 stainless steel plates is installed with a group of water-cooling elements. The installed 2-8 groups of water-cooling elements 20 can be cooled by water individually or in series according to the working conditions. Anchor nails 3 with a diameter of 10 mm, a spacing of 180 mm, and a V-shape with the inner wall of the shell are welded inside the square-to-circular interface shell 1. A casting mold is welded according to the outer shape of the square-to-circular interface shell 1. The size of the casting mold is smaller than the size of the square-to-circular interface shell 1. The casting mold is placed inside the square-to-circular interface shell 1. The spacing between the casting mold and the square-to-circular interface shell 1 is 300 mm. A casting material with a thickness of 300 mm is poured inside and vibrated to form a first masonry 14. The casting material is made of chromium-aluminum steel fiber reinforced casting material.
[0030] Reference Figure 3The straight flue shell 4 is a cylindrical structure, made of Q245R steel, with a thickness of 16mm. A second cooling system 22 is provided on the surface of the straight flue shell 4, which divides the straight flue shell 4 into four equal areas in the circumferential direction, and each area is equipped with a water-cooling element 20: a multi-turn passage is formed by connecting 5#*6mm thick stainless steel angle steels end to end, wherein the longitudinal angle steels are arranged in parallel with a spacing of 150mm, and the stainless steel angle steels are installed on the straight flue shell 4 by welding. After the stainless steel angle steels form a passage, end plates 18 are welded at both ends for blocking. After blocking, a flange joint 19 is welded and installed on each angle steel 50mm away from the end plates, forming a group of water-cooling elements 20. The four groups of water-cooling elements can be cooled by water individually or in series according to the working conditions. A 275mm thick direct-bonded chrome-magnesia refractory brick is laid on the inner surface of the straight flue shell 4, and a 25mm thick magnesia sand ramming material is filled between the straight flue shell 4 and the refractory brick and rammed. The refractory brick and the ramming material together form a second masonry 15. The refractory brick is trapezoidal, and the big end of the refractory brick is close to the inner wall of the shell during masonry. Multiple brick support plates 6 are welded and installed in the circumferential direction inside the straight flue shell 4. The brick support plates 6 are made of stainless steel 304, and the position can be adjusted according to the height of the flue. An oil burning port 5 is opened at the lower part of the straight flue shell 4, and the diameter of the oil burning port is 200-150mm, and the position is determined by the operation.
[0031] Reference Figure 4The boiler interface shell 7 is a combination of a semicircle, a half square and a straight steel plate welded together, and is made of Q245R steel with a thickness of 16mm. An observation port 9 is provided on the boiler interface shell 7 directly in front of the boiler interface axis, and the function of the observation port 9 is to be opened at any time to observe the situation in the flue. A 500*500mm high 100mm reinforcing rib 11 with a thickness of 10mm is welded on the straight steel plate. A bonding treatment port 10 is provided on both sides of the boiler interface shell 7 at a distance of 1000mm from the boiler interface on the center line of the boiler interface. An anchor 3 with a diameter of 10mm, a spacing of 180mm, and a V-shaped shape with the inner wall surface is welded on the straight steel plate and the inner wall surface of the half square of the boiler interface shell 7, and a 200mm thick casting material is poured inside the straight steel plate and the half square of the boiler interface shell 7 to form a part of the third masonry 16, and the casting material is a chromium-aluminum steel fiber reinforced casting material. On the semicircular inner wall of the boiler interface shell 7, 275mm thick direct-bonded chrome-magnesia refractory bricks are laid. The refractory bricks are trapezoidal, and the large end is close to the shell during laying. A 25mm thick ramming material is filled between the shell and the refractory bricks and rammed. The refractory bricks and the ramming material together form another part of the third masonry 16, and the ramming material is made of magnesia. Multiple brick support plates 6 can be welded and installed along the circumferential direction inside the semicircular boiler interface shell 7. The brick support plates 6 are made of stainless steel 304, and the position can be adjusted according to the height of the flue. A supporting bracket 8 is set on the boiler interface shell 7, and the position and load of the bracket are calculated and determined according to the size of the furnace body and the weight of the flue.
[0032] Reference Figure 1 The flue cover 13 is provided with a negative pressure monitoring interface 12, and the outer surface of the flue cover 13 is provided with a third cooling system 23, which includes at least two water cooling elements: a multi-turn passage is formed by connecting 5#*6mm thick stainless steel angle steels with a parallel spacing of 150mm, and welded to the shell of the flue cover 13. After the stainless steel angle steel forms the passage, end plates 18 are welded at both ends for blocking. After blocking, a flange joint 19 is welded and installed on each angle steel at a distance of 50mm from the end plates, forming a group of water cooling elements 20. The flue cover 13 is composed of at least two identical or different covers, and each cover is equipped with a water cooling element 20. The water cooling element 20 can be cooled by water alone or in series according to the working conditions. Anchor nails 3 with a diameter of 10mm, a spacing of 180mm, and a V-shaped anchor with the inner wall of the shell are welded inside the shell of the flue cover 13, and a 250mm thick castable is poured to form a fourth masonry 17.
[0033] Reference Figure 1-5The utility model is provided with a cooling circulating water system connected to the cooling system 2, including a water supply pipeline, a return pipeline and a water supply device. A pneumatic ball valve and a manual ball valve are sequentially arranged on the water supply pipeline along the water flow direction, and the pneumatic ball valve is connected to a DCS control system. Among them, the water supply pipeline is externally connected to a water supply device, which can provide cooling circulating water for the cooling system 2, the manual ball valve is arranged above the water tank of the water supply device, and the pneumatic ball valve is arranged near the water supply pipeline, and connected to the DCS control system, which can realize remote control. A manual copper gate valve is arranged on the return water pipeline. The manual copper gate valve is arranged near the return water pipeline, and a return water temperature monitoring device is arranged on the return water pipeline. The utility model can improve the speed and accuracy of emergency response and reduce the safety risk of operation by setting a cooling circulating water system connected to each water-cooled element 20 in the cooling system 2. On the one hand, when a circulating water leak occurs on site and creates a safety risk, the manual ball valve can be closed nearby or the pneumatic ball valve can be closed remotely according to the on-site situation. On the other hand, the manual copper gate valve can be adjusted according to actual needs to control the cooling water flow of the water-cooled element 20. Among them, the water supply pipeline and the return water pipeline can be an integrally formed hard pipe or hose, or a spliced pipe formed by connecting one or more sections of hard pipes and metal hoses. The specific structure can be selected according to actual needs.
[0034] As shown in the figure, the specific use process is: the top-blown furnace flue gas is Figure 1 The arrow direction enters from the top-blown furnace flue gas inlet at the bottom of the square-to-round interface shell 1, and enters the boiler interface of the acid-making system through the straight flue shell 4 and the boiler interface shell 7. Coking often occurs at the interface between the flue and the boiler. The negative pressure monitoring set on the flue cover 13 displays the negative pressure data in the flue in real time. When the negative pressure reaches a certain value, the wind is stopped and the observation port is opened to understand the situation in the flue. If a hanging curtain occurs, the bonding treatment port is opened for manual treatment; if diesel or natural gas combustion is required, diesel or natural gas is burned through the oil burning port, and the flow rate of the cooling circulating water system connected to the cooling system 2 is increased, and the surface of the square-to-round interface shell 1, the straight flue shell 4 and the flue cover 13 is enhanced. The return water temperature is monitored in real time to control the inlet and outlet water flow rates. While removing the bonding, the degree of refractory brick burning is minimized, thereby increasing the life of the flue.
[0035] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A flue structure connecting a top-blown furnace and a boiler, comprising a shell, a masonry body, and a flue cover, characterized in that: The shell includes a square-to-round interface shell, a straight flue shell, and a boiler interface shell; a first cooling system is installed on the outer surface of the square-to-round interface shell, and a first masonry is built inside; the straight flue shell is a cylindrical structure, a second cooling system is installed on the outer surface of the straight flue shell, an oil burning port is opened on the surface, and a second masonry is built inside; a supporting corbel is installed on the outer surface of the boiler interface shell, and an observation port and a bonding treatment port are opened, and a third masonry is built inside the boiler interface shell; the masonry is formed of refractory bricks, ramming materials or castables; the flue cover is composed of more than two cover plates, a third cooling system is installed on the outer surface of the flue cover, and a negative pressure monitoring interface is opened, the negative pressure monitoring interface is connected to the negative pressure monitoring device, and a fourth masonry is built on the inner surface of the flue cover; the flue cover is installed on the top of the connection between the boiler interface shell and the boiler.
2. The flue structure connecting the top-blown furnace and the boiler according to claim 1, characterized in that: The first cooling system installed on the outer surface of the square-to-circular interface shell is composed of 2-8 groups of water-cooling elements, and the water-cooling elements are fixed on the flat plate of the square-to-circular interface shell.
3. The flue structure connecting the top-blown furnace and the boiler according to claim 1, characterized in that: The second cooling system installed on the outer surface of the straight flue shell is composed of 2-4 groups of water cooling elements, and the water cooling elements are fixed on the straight flue shell.
4. The flue structure connecting the top-blown furnace and the boiler according to claim 1, characterized in that: The second masonry inside the straight flue shell is formed of refractory bricks and ramming materials: the inner surface of the straight flue shell is laid with refractory bricks, and ramming materials are filled between the straight flue shell and the refractory bricks. The refractory bricks are trapezoidal, and the large end of the trapezoidal refractory bricks is close to the straight flue shell.
5. The flue structure connecting the top-blown furnace and the boiler according to claim 4, characterized in that: At least two brick supporting plates are welded in the circumferential direction inside the straight flue shell, and the brick supporting plates are made of stainless steel.
6. The flue structure connecting the top-blown furnace and the boiler according to claim 1, characterized in that: The oil burning port opened on the surface of the straight flue shell has a diameter of 200-150mm.
7. The flue structure connecting the top-blown furnace and the boiler according to claim 1, characterized in that: The boiler interface shell is formed by welding a semicircle, a half square turned into a circle and a straight steel plate, and reinforcing ribs are welded on the straight steel plate of the boiler interface shell.
8. The flue structure connecting the top-blown furnace and the boiler according to claim 7, characterized in that: The third masonry inside the boiler interface shell includes masonry inside the straight steel plate, masonry inside the half-square circle and masonry inside the semicircle. Anchors are welded on the straight steel plate and the inner wall of the half-square circle of the boiler interface shell. The anchors and the straight steel plate and the inner wall of the half-square circle of the boiler interface shell are V-shaped. The masonry inside the straight steel plate and the half-square circle is formed of castables, and the castable material is chromium-aluminum steel fiber reinforced casting material; the masonry inside the semicircle is formed of refractory bricks and ramming materials. The inner surface of the semicircle is laid with refractory bricks, and ramming materials are filled between the semicircle and the refractory bricks.
9. The flue structure connecting the top-blown furnace and the boiler according to claim 1, characterized in that: The third cooling system of the outer surface of the flue cover is composed of water cooling elements. Each cover plate constituting the flue cover is equipped with a water cooling element, and the water cooling element is fixed on the outer surface of the cover plate of the flue cover.
10. The flue structure connecting the top-blown furnace and the boiler according to claim 1, characterized in that: Anchors are welded on the inner wall of the square-to-round interface shell and the flue cover, and the anchors and the inner wall of the square-to-round interface shell are in a V shape. The first masonry and the second masonry inside the square-to-round interface shell and the flue cover are respectively formed of casting materials, and the casting materials are made of chromium-aluminum steel fiber reinforced casting materials.
11. The flue structure connecting the top-blown furnace and the boiler according to any one of claims 2, 3 or 9, characterized in that: The water cooling element is a multi-turn passage formed by connecting stainless steel angle steels end to end, with end plates welded at both ends of the passage, and flange joints are respectively installed on the angle steels close to the end plates at both ends.
12. According to the flue structure connecting the top-blown furnace and the boiler according to claim 1, the first, second and third cooling systems are connected to the cooling circulating water system through flange joints, including a water supply pipeline, a return pipeline and a water supply device; a pneumatic ball valve and a manual ball valve are sequentially arranged on the water supply pipeline along the water flow direction, and the pneumatic ball valve is connected to the DCS control system; a manual copper gate valve and a return water temperature monitoring device are arranged on the return pipeline.