Evaporative cold pipe deslagging structure and deslagging method

Abstract

The application relates to an evaporative cold-pipe deslagging structure and a deslagging method, and belongs to the technical field of dry dust removal equipment for converter steelmaking. The evaporative cold-pipe deslagging structure comprises a detection rod arranged at the top of an evaporative cold pipe, a plurality of vibration assemblies arranged on the side wall of the outer surface of the evaporative cold pipe and a maintenance door arranged on one side of the bottom of the evaporative cold pipe. The vibration assembly comprises a base fixedly arranged on the side wall of the evaporative cold pipe and a vibration motor detachably connected to the base. The base comprises a bottom plate arranged on the side wall of the evaporative cold pipe and a connecting plate arranged on the bottom plate. The bottom plate is an arc-shaped plate, and the curvature of the bottom plate is greater than that of the side wall of the evaporative cold pipe. The application has the advantages of complete descaling effect, dry dust removal, prolonged service life of the equipment, improved dust removal effect, high coal gas recovery quality and the like.

Description

Technical Field

[0001] This application relates to the technical field of dry dust removal equipment for converter steelmaking, and in particular to a slag removal structure and method for evaporative cooling pipes. Background Technology

[0002] Dry dust removal systems can treat the high-temperature flue gas generated at the top of the converter steelmaking process. Evaporative cooling equipment is the core component of a dry dust removal system. This equipment uses spray evaporation to cool the high-temperature flue gas, facilitating subsequent dust removal and gas recovery operations.

[0003] During production, it was discovered that scaling easily forms on the inner walls of the evaporative cooling tubes. This scaling affects the conditioning of high-temperature flue gas by the spray equipment, reduces the dust collection capacity of the dust removal electric field, and ultimately compromises the exhaust quality of the vent chimney. Furthermore, scaling reduces the cross-sectional area of ​​the evaporative cooling tubes, impacting the airflow into the dust removal system, leading to increased flue gas temperature and hindering the effective recovery of converter gas, resulting in resource waste. The incompletely recovered gas burns extensively at the converter inlet, subjecting the upper platform structure to prolonged baking and severely compromising the safety of the converter steel frame. High-temperature flue gas also significantly shortens the lifespan of the dust collector bags. Therefore, continuous descaling of the inner walls of the evaporative cooling tubes is necessary during converter steelmaking. Each descaling operation requires a four-day shutdown and the construction of a platform inside the evaporative cooling tubes for manual access. Manual work within this confined space is labor-intensive and carries a high risk.

[0004] In light of the aforementioned technical background, the inventors believe that existing descaling operations on the inner wall of evaporator cooling pipes suffer from drawbacks such as high labor intensity for workers, high risk factor, and low operational efficiency. Summary of the Invention

[0005] In order to ensure the overall efficiency of converter steelmaking, reduce environmental pollution caused by flue gas emissions during the steelmaking process, reduce the labor intensity of workers, and improve production safety, this application provides an evaporative cooling pipe slag removal structure and slag removal method.

[0006] Firstly, the slag removal structure for an evaporative cooling pipe provided in this application adopts the following technical solution:

[0007] A slag removal structure for an evaporative cooling pipe includes a detection rod at the top of the evaporative cooling pipe, multiple vibration components on the outer surface sidewall of the evaporative cooling pipe, and an inspection door on one side of the bottom of the evaporative cooling pipe. The vibration components include a base fixed on the sidewall of the evaporative cooling pipe and a vibration motor detachably connected to the base. The base includes a bottom plate on the sidewall of the evaporative cooling pipe and a connecting plate on the bottom plate. The bottom plate is an arc-shaped plate, and the curvature of the bottom plate is greater than the curvature of the sidewall of the evaporative cooling pipe.

[0008] By adopting the above technical solution, the detection rod structure installed on the evaporator cooling tube can detect the structural condition of the inner wall of the evaporator cooling tube, which facilitates the staff to evaluate the cleaning effect of the inner wall of the evaporator cooling tube and make corresponding decisions. The vibration component installed on the outer surface sidewall of the evaporator cooling tube can clean the scale on the inner wall of the evaporator cooling tube by generating vibration. Compared with the method of manually entering the evaporator cooling tube for cleaning, it has many advantages such as high safety and high cleaning efficiency, and significantly shortens the time required for cleaning the evaporator cooling tube. The inspection door installed at the bottom of the evaporator cooling tube can facilitate the discharge of the scale ash layer from the evaporator cooling tube. This achieves the invention purpose of ensuring the overall efficiency of converter steelmaking, reducing environmental pollution caused by flue gas emissions during steelmaking, reducing the labor intensity of workers, and improving production safety.

[0009] Optionally, the base also includes a support plate, which is vertically connected between the base plate and the connecting plate.

[0010] By adopting the above technical solution, the support plate structure on the base can increase the mechanical strength of the connection structure between the base plate and the connecting plate, prevent the base from detaching from the vibration motor, improve the stability of the base supporting the vibration motor, and enable the vibration generated by the vibration motor to be better transmitted to the evaporation cooling tube, thereby further improving the slag removal efficiency.

[0011] Optionally, the vibration motor includes a base, a three-phase asynchronous motor mounted on the base, a control panel mounted on the base, and eccentric blocks symmetrically mounted on both ends of the power output shaft of the three-phase asynchronous motor; the control panel is electrically connected to the three-phase asynchronous motor.

[0012] By adopting the above technical solution, the base installed on the base plays a supporting and limiting role in the installation of the three-phase asynchronous motor. The eccentric blocks sleeved on both ends of the output shaft of the three-phase asynchronous motor can rotate synchronously under the drive of the three-phase asynchronous motor. The periodic centrifugal motion generated by the rotation of the eccentric blocks can cause the base to vibrate and transmit it to the base, thereby causing the evaporator cooling tube to vibrate and achieve the purpose of slag removal. The control panel installed on the base can control the speed and start / stop timing of the three-phase asynchronous motor, avoid ineffective rapping of the vibration motor with the same amplitude and frequency, improve the slag removal efficiency while reducing energy loss.

[0013] Optionally, protective covers are symmetrically provided at both ends of the base, and the protective covers cover the outside of the eccentric block.

[0014] By adopting the above technical solution, the protective cover structure symmetrically arranged at both ends of the machine base and covering the outside of the eccentric block can prevent debris from getting entangled during the rotation of the eccentric block, thus protecting the shaft of the three-phase asynchronous motor and helping to slow down the rusting process of the eccentric block.

[0015] Optionally, the detection rod is snapped onto the sealing block at the top of the evaporator cooling tube and a rod body vertically inserted through the sealing block; the rod body is rotatably connected to the sealing block, and the rod body is provided with scale lines along the axial direction.

[0016] By adopting the above technical solution, the rod that is slidably connected to the sealing block along the direction perpendicular to the ground plays the role of rubbing the inner wall of the evaporator cooling pipe. The scale on the rod can be used to indicate the height of the scale position on the inner wall of the evaporator cooling pipe. The sealing block can provide support and limit the installation of the rod while ensuring the sealing performance of the evaporator cooling pipe.

[0017] Optionally, a handwheel is provided at the top of the lever.

[0018] By adopting the above technical solution, the handwheel structure set at the top of the rod can reduce the force required to rotate the rod, making the testing process more convenient and labor-saving.

[0019] Optionally, the rod body is provided with a limiting protrusion, the lower surface of which abuts against the upper surface of the sealing block.

[0020] By adopting the above technical solution, the limiting protrusion structure set on the rod can prevent the rod from slipping into the evaporator cooling tube, and plays a limiting role in the rotational connection structure of the rod.

[0021] Optionally, the access door includes a frame extending through the bottom of the evaporator cooling pipe, a door panel rotatably connected to the frame, and a heat-resistant sealing ring covering the edge of the door panel.

[0022] By adopting the above technical solution, the frame of the inspection door supports the door panel, and the rotating connection structure between the door panel and the frame allows workers to easily connect the evaporator cooling pipe to the outside by rotating it, thereby facilitating the discharge of ash and slag.

[0023] Optionally, a guide plate is provided on the inner side of the frame of the evaporator cooling pipe, and the guide plate is rotatably connected to the evaporator cooling pipe.

[0024] By adopting the above technical solution, the guide plate installed on the inner side of the evaporator cooling pipe plays a guiding role in the ash and slag that falls due to vibration, so that it can be discharged from the maintenance door along the guide plate.

[0025] Secondly, the slag removal method for evaporative cooling pipes provided in this application utilizes the slag removal structure for evaporative cooling pipes described above, and adopts the following technical solution:

[0026] A method for removing slag from evaporative cooling pipes includes the following steps:

[0027] Step 1: Measure the diameter of the evaporator cooling tube, the flue gas velocity, the location and thickness of the scale buildup;

[0028] Step 2: Based on the Lagrange discrete phase model theory and combined with the relevant data obtained in Step 1, CFD flow field simulation is used to simulate the flue gas flow field and analyze the high temperature region, high speed region, deflection region, and recirculation region.

[0029] Step 3: Combining the location and thickness of the scale in Step 1, determine the characteristics and distribution pattern of the scale on the evaporator cooling pipe.

[0030] Step 4: Based on the distribution pattern obtained in Step 3, install the vibration assembly at the location corresponding to the easy-to-fouling points on the evaporator cooling pipe, and adjust the vibration motor to different amplitudes and vibration frequencies.

[0031] Step 5: Install the detection rod and inspection door, and turn on the vibration motor to perform vibration descaling;

[0032] Step 6: Turn off the vibration motor, rotate the rod and pull it out. Take a reading at the location where dirt appears and turn on the nearest vibration motor at the corresponding height to vibrate and remove the dirt until no dirt appears on the rod. Finally, install the rod back in its original position.

[0033] By adopting the above technical solution, based on the Lagrange discrete phase model theory, and using CFD flow field simulation to determine the structural position of flue gas flow field, the structural characteristics and scaling patterns of evaporator cooling tubes of different sizes and specifications can be obtained. This allows staff to make adaptive adjustments and improvements to the installation position, quantity, and vibration frequency of the vibration components, thereby further optimizing the slag removal effect and improving slag removal efficiency while saving manufacturing and installation costs and equipment power consumption.

[0034] In summary, this application includes at least one of the following beneficial technical effects:

[0035] 1. The detection rod structure installed on the evaporative cooling tube in this application can detect the structural condition of the inner wall of the evaporative cooling tube, making it convenient for staff to evaluate the cleaning effect of the inner wall of the evaporative cooling tube and make corresponding decisions. The vibration component installed on the outer surface sidewall of the evaporative cooling tube can clean the scale on the inner wall of the evaporative cooling tube by generating vibration. Compared with the method of manually entering the evaporative cooling tube for cleaning, it has many advantages such as high safety and high cleaning efficiency, significantly shortening the time required for cleaning the evaporative cooling tube. The inspection door installed at the bottom of the evaporative cooling tube can facilitate the discharge of the scale ash layer from the evaporative cooling tube, achieving the invention objectives of ensuring the overall efficiency of converter steelmaking, reducing environmental pollution caused by flue gas emissions during steelmaking, reducing the labor intensity of workers, and improving production safety.

[0036] 2. In this application, the base installed on the base provides support and limit for the installation of the three-phase asynchronous motor. The eccentric blocks sleeved on both ends of the output shaft of the three-phase asynchronous motor can rotate synchronously under the drive of the three-phase asynchronous motor. The periodic centrifugal motion generated by the rotation of the eccentric blocks can cause the base to vibrate and transmit it to the base, thereby causing the evaporator cooling tube to vibrate and achieve the purpose of slag removal. The control panel installed on the base can control the speed and start / stop timing of the three-phase asynchronous motor, avoid ineffective rapping of the vibration motor with the same amplitude and frequency, improve the slag removal efficiency while reducing energy loss.

[0037] 3. Based on the Lagrange discrete phase model theory, this application uses CFD flow field simulation to determine the structural position of flue gas flow field. This method can reveal the structural characteristics and scaling patterns of evaporator cooling tubes of different sizes and specifications. As a result, staff can make adaptive adjustments and improvements to the installation position, quantity, and vibration frequency of the vibration components. This further optimizes the slag removal effect and improves the slag removal efficiency while saving manufacturing and installation costs and equipment power consumption. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of a slag removal structure for an evaporative cooling pipe disclosed in an embodiment of this application.

[0039] Figure 2 This is a schematic diagram of the detection rod in an embodiment of this application.

[0040] Figure 3 This is a schematic diagram of the base structure in an embodiment of this application.

[0041] Figure 4 This is a schematic diagram of the structure of the vibration motor in the embodiment of this application.

[0042] Figure 5 This is a schematic diagram of the structure of the inspection door in an embodiment of this application.

[0043] Explanation of reference numerals in the attached drawings: 1. Detection rod; 11. Sealing block; 12. Rod body; 13. Handwheel; 121. Limiting protrusion; 2. Vibration assembly; 21. Base; 22. Vibration motor; 211. Base plate; 212. Connecting plate; 213. Support plate; 221. Machine base; 222. Three-phase asynchronous motor; 223. Control panel; 224. Eccentric block; 225. Protective cover; 3. Inspection door; 31. Frame; 32. Door panel; 33. Heat-resistant sealing ring; 311. Guide plate. Detailed Implementation

[0044] The following is in conjunction with the appendix Figure 1 -Appendix Figure 5 This application will be described in further detail.

[0045] Dry dust removal systems can treat the high-temperature flue gas generated at the furnace top during converter steelmaking. Evaporative cooling equipment is the core equipment in dry dust removal systems. Evaporative cooling equipment cools the high-temperature flue gas through spray evaporation, facilitating subsequent dust removal and gas recovery operations. During production, it was found that scaling easily occurs on the inner wall of the evaporative cooling tubes. Continuous descaling of the inner wall of the evaporative cooling tubes is required during converter steelmaking. Each descaling operation requires a four-day shutdown of the entire production line, and a platform must be built inside the evaporative cooling tubes for manual access. Manual work in this confined space is labor-intensive and dangerous. To ensure the overall efficiency of converter steelmaking, reduce environmental pollution caused by flue gas emissions during steelmaking, reduce worker labor intensity, and improve production safety, this application provides a slag removal structure and method for evaporative cooling pipes.

[0046] Firstly, this application discloses a slag removal structure for an evaporative cooling pipe. (Refer to...) Figure 1 and Figure 2 A slag removal structure for an evaporative cooling pipe includes a detection rod 1, a vibration assembly 2, and an inspection door 3. The detection rod 1 is installed vertically through the top of the evaporative cooling pipe. Multiple vibration assemblies 2 are configured according to the actual conditions of the evaporative cooling pipe and are installed on the side wall of the evaporative cooling pipe in different ways depending on the specific conditions. The inspection door 3 is located at the end of the side wall of the evaporative cooling pipe closest to the ground.

[0047] Reference Figure 1 and Figure 2 The detection rod 1 includes a sealing block 11, a rod body 12, and a handwheel 13. The sealing block 11 is slidably mounted on the top of the evaporator cooling pipe, perpendicular to the ground. The rod body 12 is vertically inserted through the sealing block 11 and rotatably connected to it. The rod body 12 can be a solid cylindrical metal rod with a circular cross-section, and its axis is distributed along a broken line. The rod body 12 has evenly spaced graduations indicating its height above the ground along its length. A limiting protrusion 121 is circumferentially positioned on the rod body 12, limiting its installation and abutting against the upper surface of the sealing block 11. The handwheel 13 is fixedly mounted on the top of the rod body 12 and can rotate the rod body 12. Handwheel 13 drives rod 12 to rotate. The part of rod 12 located inside the evaporator cooling tube will rub against the inner surface sidewall of the evaporator cooling tube during the rotation. After the detection rod 1 is pulled out of the evaporator cooling tube, the location of scale buildup inside the evaporator cooling tube can be determined based on the location of the rubbing on rod 12.

[0048] Reference Figure 1 , Figure 3 and Figure 4The vibration assembly 2 includes a base 21 and a vibration motor 22. The base 21 includes a base plate 211, a connecting plate 212, and a support plate 213. The base plate 211 is fixedly mounted on the side wall of the evaporator cooling tube by welding. The base plate 211 is an arc-shaped plate with a curvature greater than that of the evaporator cooling tube side wall. The maximum gap between the base plate 211 and the outer surface side wall of the evaporator cooling tube is 20 mm, allowing the vibration generated by the vibration motor 22 to be transmitted to the inner side of the evaporator cooling tube through a striking motion. The connecting plate 212 is a rectangular metal plate with multiple bolt holes, used to mount the vibration motor 22. The support plate 213 is vertically positioned between the base plate 211 and the connecting plate 212, improving the mechanical strength and load-bearing capacity of the connection structure between the connecting plate 212 and the base plate 211. The vibration motor 22 includes a base 221, a three-phase asynchronous motor 222, a control panel 223, an eccentric block 224, and a protective cover 225. The base 221 is bolted to the connecting plate 212. The three-phase asynchronous motor 222 is a dual-shaft motor, mounted inside the base 221. The control panel 223 is mounted on the base 221 and electrically connected to the three-phase asynchronous motor 222. The eccentric block 224 is a sector-shaped solid metal block. The eccentric block 224 is symmetrically fixedly mounted on the two power output shafts of the three-phase asynchronous motor 222. Protective covers 225 are bolted to both sides of the base 221, and are fitted over the outer sides of the eccentric blocks 224. The eccentric blocks 224 can rotate and vibrate under the drive of the three-phase asynchronous motor 222. The control panel 223 can perform timed and quantitative control of the start / stop, speed, and direction of rotation of the three-phase asynchronous motor 222, preventing multiple vibration motors 22 from vibrating ineffectively at the same frequency.

[0049] Reference Figure 1 and Figure 5 The inspection door 3 includes a frame 31, a door panel 32, and a heat-resistant sealing ring 33. The frame 31 is welded to the side wall of the evaporator cooling pipe near the ground, and the door panel 32 is rotatably connected to the frame 31. The heat-resistant sealing ring 33 is circumferentially fixed inside the door panel 32. A guide plate 311 is obliquely installed at the bottom of the evaporator cooling pipe via a rotatable connection, with the lower end of the guide plate 311 at the same vertical height as the lower edge of the frame 31. Pulling the door panel 32 connects the inside of the evaporator cooling pipe to the outside, allowing fallen ash to flow outwards through the inspection door 3 via the guide plate 311. After ash removal, the guide plate 311 can be rotated to a position parallel to the gas flow direction inside the evaporator cooling pipe, preventing interference with the normal operation of the evaporator cooling pipe.

[0050] Secondly, this application discloses a method for removing slag from an evaporative cooling pipe, which utilizes the aforementioned slag removal structure for an evaporative cooling pipe and adopts the following technical solution:

[0051] A method for removing slag from evaporative cooling pipes includes the following steps:

[0052] Step 1: Measure the diameter of the evaporator cooling tube, the flue gas velocity, the location and thickness of the scale buildup;

[0053] Step 2: Based on the Lagrange discrete phase model theory and combined with the relevant data obtained in Step 1, CFD flow field simulation is used to simulate the flue gas flow field and analyze the high temperature region, high speed region, deflection region, and recirculation region.

[0054] Step 3: Combining the location and thickness of the scale in Step 1, determine the characteristics and distribution pattern of the scale on the evaporator cooling pipe.

[0055] Step 4: Based on the distribution pattern obtained in Step 3, install the vibration component 2 at the location corresponding to the easy-to-fouling points on the evaporator cooling pipe, and adjust the vibration motor 22 to different amplitudes and vibration frequencies.

[0056] Step 5: Install the detection rod 1 and the inspection door 3, and turn on the vibration motor 22 to perform vibration descaling;

[0057] Step 6: Turn off the vibration motor 22, rotate the rod 12 and pull it out. Take a reading at the location where dirt appears and turn on the nearest vibration motor 22 at the corresponding height to vibrate and remove dirt until no more dirt appears on the rod 12. Finally, install the rod 12 back in its original position.

[0058] In step 4 above, the selection of the installation location needs to be made according to the different shapes of the evaporator cooling tubes and the obtained scaling patterns. In this embodiment, the vibration component 2 consists of twelve groups, divided into upper, middle and lower layers, and is distributed in a spiral shape. The vibrators of each layer are evenly distributed on the evaporator cooling cylinder wall at 60° intervals.

[0059] In steps 5 and 6 above, the vibration motor 22 is started to vibrate the evaporator cooling tubes every 2 hours. The vibration time can be increased or decreased according to the actual scaling situation. When vibrating the evaporator cooling tubes, the vibration is carried out in layers according to the installation position, and the vibration time of each layer is 1 minute. After all three layers are vibrated, the bottom cone part of the evaporator cooling tubes is vibrated again, and the slag removal work is carried out at the same time to prevent blockage of the internal slag removal system. The vibration effect of the system is checked regularly, and the amplitude and frequency of the vibration part are adjusted according to the remaining scaling situation.

[0060] The above are preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made to the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A method for removing slag from an evaporative cooling pipe, characterized in that: The device includes a detection rod (1) on the top of the evaporator cooling tube, multiple vibration components (2) on the outer surface sidewall of the evaporator cooling tube, and an inspection door (3) on the bottom side of the evaporator cooling tube. The detection rod (1) includes a sealing block (11), a rod body (12), and a handwheel (13). The vibration component (2) includes a base (21) fixed on the sidewall of the evaporator cooling tube and a vibration motor (22) detachably connected to the base (21). The base (21) includes a base plate (211) on the sidewall of the evaporator cooling tube and a connecting plate (212) on the base plate (211). The base plate (211) is an arc-shaped plate, and the curvature of the base plate (211) is greater than the curvature of the sidewall of the evaporator cooling tube. The base (21) also includes a support plate (213), which is vertically connected between the base plate (211) and the connecting plate (212); The vibration motor (22) includes a base (221), a three-phase asynchronous motor (222) mounted on the base (221), a control panel (223) mounted on the base (221), and eccentric blocks (224) symmetrically mounted on both ends of the power output shaft of the three-phase asynchronous motor (222); the control panel (223) is electrically connected to the three-phase asynchronous motor (222); The rod (12) is snapped onto the sealing block (11) at the top of the evaporator cooling tube and is vertically inserted through the sealing block (11); the rod (12) is rotatably connected to the sealing block (11), and the rod (12) is provided with scale lines along the axial direction; A handwheel (13) is provided at the top of the rod (12); The inspection door (3) includes a frame (31) passing through the bottom of the evaporator cooling pipe, a door panel (32) rotatably connected to the frame (31), and a heat-resistant sealing ring (33) covering the edge of the door panel (32). Includes the following steps: Step 1: Measure the diameter of the evaporator cooling tube, the flue gas velocity, the location and thickness of the scale buildup; Step 2: Based on the Lagrange discrete phase model theory and combined with the relevant data obtained in Step 1, CFD flow field simulation is used to simulate the flue gas flow field and analyze the high temperature region, high speed region, deflection region, and recirculation region. Step 3: Combining the location and thickness of the scale in Step 1, determine the characteristics and distribution pattern of the scale on the evaporator cooling pipe. Step 4: Based on the distribution pattern obtained in Step 3, install the vibration component (2) at the location corresponding to the easy-to-fouling point of the evaporator cooling tube, and adjust the vibration motor (22) to different amplitudes and vibration frequencies. Step 5: Install the detection rod (1) and the inspection door (3), and turn on the vibration motor (22) to perform vibration descaling; Step 6: Turn off the vibration motor (22), rotate the rod (12) and pull out the rod (12), take a reading of the location where dirt appears and turn on the nearest vibration motor (22) at the corresponding height to vibrate and remove dirt until no dirt appears on the rod (12). Finally, install the rod (12) back in its original position.

2. The slag removal method for an evaporative cooling pipeline according to claim 1, characterized in that: The base (221) is provided with protective covers (225) symmetrically at both ends, and the protective covers (225) cover the outside of the eccentric block (224).

3. The slag removal method for an evaporative cooling pipeline according to claim 1, characterized in that: The rod (12) is provided with a limiting protrusion (121), and the lower surface of the limiting protrusion (121) abuts against the upper surface of the sealing block (11).

4. The slag removal method for an evaporative cooling pipeline according to claim 1, characterized in that: The frame (31) has a guide plate (311) on one side inside the evaporator cooling pipe, and the guide plate (311) is rotatably connected to the evaporator cooling pipe.

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