Defect inspection device for heat exchange tube nest in slurry bed reactor

Abstract

The utility model relates to the field of slurry bed reactors, in particular to a defect inspection device for a heat exchange tube nest in a slurry bed reactor. The slurry bed reactor internal heat exchange tube nest defect inspection device comprises a reactor body, an air pump and a connecting base, heat exchangers are symmetrically installed in the reactor body, each heat exchanger is composed of a plurality of dry straight pipelines, the air pump is in butt joint with one side of each heat exchanger and used for punching the interior of each heat exchanger, and the connecting base is installed on the outer wall of each heat exchanger. A water tank is fixedly connected to one side of each connecting base, nozzles are formed in the connecting bases respectively, the water tanks are communicated with the nozzles, and foam water is injected into the water tanks. According to the utility model, an air pump stamping and foam water spraying method is adopted, and the inlet and outlet pipelines of the heat exchange tube nests do not need to be cut and welded, so that the operation steps are greatly simplified, and the efficiency and convenience of defect inspection are improved. The online detection method can be carried out under the condition that normal production is not influenced, and the downtime and the maintenance cost are effectively reduced.

Description

Technical Field

[0001] The utility model relates to the field of slurry bed reactors, in particular to a device for inspecting defects of heat exchange tubes inside a slurry bed reactor. Background Art

[0002] In the routine maintenance and defect inspection of the heat exchange tubes inside the slurry bed reactor, the traditional method often involves cutting the inlet and outlet pipelines of the heat exchange tubes and then sealing them with welding plugs to perform pressure filling and leak detection. However, this method has several significant disadvantages and limitations in practical applications.

[0003] First, the cutting and welding of heat exchange tubes is a heavy workload, which not only increases maintenance costs, but also prolongs downtime, seriously affecting production efficiency and economic benefits. In addition, since heat exchange tubes are usually arranged closely and the operating space is limited, cutting and welding work becomes particularly difficult, further increasing the complexity and risk of the operation.

[0004] Secondly, the inlet and outlet pipelines of the heat exchange tubes are pressure pipelines. Once cutting and welding operations are performed, it is easy to introduce new stress concentration areas, resulting in pipeline stress imbalance, and then new leaks or defects. This may not only aggravate the deterioration of the original defects, but also pose a serious threat to the safe operation of the entire reactor.

[0005] Finally, when there are flammable, explosive, toxic and hazardous materials on site, hot work and confined space work will bring great safety risks. Once these materials leak or cause fire, explosion and other accidents, it will cause immeasurable losses to personnel safety, equipment safety and environmental safety.

[0006] Therefore, it is necessary to provide a new device for inspecting defects of internal heat exchange tubes in a slurry bed reactor to solve the above technical problems. Utility Model Content

[0007] In order to solve the above technical problems, the utility model provides a device for inspecting defects of heat exchange tubes inside a slurry bed reactor.

[0008] The utility model provides a device for inspecting defects of internal heat exchange tubes in a slurry bed reactor, comprising: a reactor body, an air pump and a connecting seat. A heat exchanger is symmetrically installed inside the reactor body, and the heat exchanger is composed of a plurality of dry in-line pipes. The air pump is docked at one side of the heat exchanger and is used to press the inside of the heat exchanger to 0.4-0.7MPa. The connecting seat is installed on the outer wall of the heat exchanger, and a water tank is fixedly connected to one side of the connecting seat. Nozzles are respectively provided on the connecting seat, and the water tank is connected to the nozzles, and foam water is filled inside the water tank.

[0009] Preferably, the connecting seat is located between the fixed frame and the movable frame, a threaded rod is rotatably connected between the fixed frame and the movable frame, pulleys are rotatably connected inside the fixed frame and the movable frame, a driving source is fixedly connected to one side of the movable frame, and the driving source is fixedly connected to the pulley axis on the movable frame.

[0010] Preferably, one side of the water tank is rotatably connected to a reciprocating screw, and a travel groove is opened on the side of the water tank close to the reciprocating screw, forming a folding airbag fixedly connected to the inner wall of the groove, and a slider is installed at one end of the reciprocating screw, one end of the slider is fixedly connected to the folding airbag, and the bottom end of the folding airbag is connected to the inside of the water tank. The slider reciprocates on the reciprocating screw, so that the folding airbag continuously injects air into the water tank, thereby increasing the air pressure in the water tank.

[0011] Preferably, the output end of the driving source and one end of the reciprocating screw rod are fixedly connected with a sprocket, a groove is opened on one side of the fixed frame, a spring is fixedly connected inside the groove, one end of the spring is fixedly connected to a connecting block, one end of the connecting block is rotatably connected to a tensioning sprocket, and the two sprockets and the tensioning sprocket are connected by a chain transmission.

[0012] Preferably, one-way valves are installed at the top and bottom ends of the folding airbag. The one-way valve at the bottom of the folding airbag prevents air leakage from the water tank, and the one-way valve at the top of the folding airbag is used to inflate the folding airbag.

[0013] Preferably, the nozzle is designed to be an angle-adjustable nozzle so as to adapt to heat exchange tubes at different angles.

[0014] Preferably, the inner wall of the in-line pipes of the heat exchanger is coated with a corrosion-resistant and high-temperature-resistant coating to improve the durability and service life of the heat exchange tubes.

[0015] Compared with the related art, the device for inspecting defects of heat exchange tubes inside a slurry bed reactor provided by the utility model has the following beneficial effects:

[0016] Efficient and convenient: The device uses air pump punching and foam water spraying methods, without cutting and welding the inlet and outlet pipelines of the heat exchange tubes, which greatly simplifies the operation steps and improves the efficiency and convenience of defect inspection. This online detection method can be carried out without affecting normal production, effectively reducing downtime and maintenance costs.

[0017] High-precision detection: By observing the flow of foam water on the heat exchange tubes, it is possible to accurately determine whether the tubes have defects. Foam water is also a good indicator of small leaks or defects, so the device has high detection accuracy and can promptly detect and deal with potential safety hazards.

[0018] High safety: This device avoids the safety risks brought by hot work and confined space work in traditional methods. In an environment where flammable, explosive, toxic and hazardous materials exist, this device can ensure the safety and reliability of the operation process, reduce the possibility of accidents, and protect the safety of personnel, equipment and the environment.

[0019] Easy to operate and maintain: The device has a simple structure and is easy to operate. It can perform defect inspection without professional equipment and personnel. At the same time, it reduces the difficulty and cost of maintenance by reducing complex operations such as cutting and welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the structure of a device for inspecting defects in heat exchange tubes inside a slurry bed reactor provided by the utility model;

[0021] Figure 2 for Figure 1 The structural schematic diagram of the heat exchanger shown;

[0022] Figure 3 for Figure 1 The schematic diagram of the structure of the connecting seat in side view and section shown;

[0023] Figure 4 for Figure 1 A schematic diagram of the structure of a partially enlarged portion of the fixing frame is shown.

[0024] Numbers in the figure: 1. Reactor body; 2. Heat exchanger; 3. Air pump; 4. Connecting seat; 5. Water tank; 6. Nozzle; 7. Sprocket; 8. Groove; 9. Spring; 10. Connecting block; 11. Tensioning sprocket; 41. Fixed frame; 42. Moving frame; 43. Pulley; 44. Threaded rod; 51. Reciprocating screw rod; 52. Travel groove; 53. Folding airbag; 54. Slider. DETAILED DESCRIPTION

[0025] 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 accompanying 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 utility model.

[0026] The specific implementation of the present utility model is described in detail below in conjunction with specific embodiments.

[0027] See also Figure 1-4A device for inspecting defects of heat exchange tubes inside a slurry bed reactor, the device comprising: a reactor body 1, an air pump 3 and a connecting seat 4, a heat exchanger 2 is symmetrically installed inside the reactor body 1, the heat exchanger 2 is composed of a plurality of dry in-line pipes, the air pump 3 is docked at one side of the heat exchanger 2, and is used to press the inside of the heat exchanger 2 to 0.4-0.7MPa, the connecting seat 4 is installed on the outer wall of the heat exchanger 2, a water tank 5 is fixedly connected to one side of the connecting seat 4, nozzles 6 are respectively provided on the connecting seat 4, the water tank 5 is connected to the nozzle 6, the water tank 5 is filled with foam water, the nozzle 6 is designed as an adjustable angle nozzle, so as to adapt to heat exchange tubes at different angles, the inner wall of the in-line pipe of the heat exchanger 2 is coated with a corrosion-resistant and high-temperature-resistant coating, so as to improve the durability and service life of the heat exchange tubes.

[0028] See also Figure 3-4 The connecting seat 4 is located between the fixed frame 41 and the movable frame 42, a threaded rod 44 is rotatably connected between the fixed frame 41 and the movable frame 42, a pulley 43 is rotatably connected inside the fixed frame 41 and the movable frame 42, a driving source is fixedly connected to one side of the movable frame 42, and the driving source is fixedly connected to the axis of the pulley 43 on the movable frame 42.

[0029] See also Figure 3 A reciprocating screw rod 51 is rotatably connected to one side of the water tank 5, and a travel groove 52 is opened on one side of the water tank 5 close to the reciprocating screw rod 51, forming a folding airbag 53 fixedly connected to the inner wall of the groove 52, and a slider 54 is installed at one end of the reciprocating screw rod 51, and one end of the slider 54 is fixedly connected to the folding airbag 53. The bottom end of the folding airbag 53 is connected to the inside of the water tank 5, and the slider 54 reciprocates on the reciprocating screw rod 51, so that the folding airbag 53 continuously injects air into the water tank 5, so that the air pressure in the water tank 5 increases. Check valves are installed at the top and bottom ends of the folding airbag 53. The check valve at the bottom of the folding airbag 53 prevents air leakage in the water tank 5, and the check valve at the top of the folding airbag 53 is used to replenish air to the folding airbag 53.

[0030] See also Figure 4 The output end of the driving source and one end of the reciprocating screw rod 51 are fixedly connected with a sprocket 7, a groove 8 is opened on one side of the fixed frame 41, a spring 9 is fixedly connected inside the groove 8, one end of the spring 9 is fixedly connected with a connecting block 10, one end of the connecting block 10 is rotatably connected with a tensioning sprocket 11, and the two sprockets 7 and the tensioning sprocket 11 are connected by chain transmission.

[0031] The working principle of the internal heat exchange tube defect inspection device of the slurry bed reactor provided by the utility model is as follows:

[0032] 1. Device composition and core functions

[0033] Reactor body 1: A heat exchanger 2 consisting of a number of dry in-line pipes is symmetrically installed inside.

[0034] Air pump 3: docked at one side of the heat exchanger 2, used for pressing the inside of the heat exchanger 2.

[0035] Connecting seat 4: designed to be detachable, installed on one side of the heat exchanger 2, and used to connect the water tank 5 and the nozzle 6.

[0036] Water tank 5: The water tank is filled with foam water and is connected to nozzle 6.

[0037] Nozzle 6: installed on the connecting seat 4, used for spraying foam water.

[0038] 2. Workflow

[0039] Initial pressurization and pressure holding to check for leaks:

[0040] The air pump 3 is started to pressurize the interior of the heat exchanger 2 so that the internal pressure reaches 0.4-0.7 MPa.

[0041] After the pressure is charged, close the air pump 3 and all related valves to hold the pressure and check for leaks.

[0042] The inspection pass standard is: within 8 hours, the pressure drop of heat exchanger 2 is less than 0.001MPa. If the pressure drop is greater than 0.001MPa, it indicates that heat exchanger 2 may have leakage or defects, and further detailed inspection using this device is required.

[0043] Detailed defect inspection:

[0044] If the initial pressure charging and pressure holding leak detection show that the heat exchanger 2 has potential defects, the connecting seat 4 is installed on one side of the heat exchanger 2.

[0045] Open the connecting valve between the water tank 5 and the nozzle 6 to allow the foam water to be sprayed onto the heat exchange tubes through the nozzle 6.

[0046] The nozzle 6 is designed as an angle-adjustable nozzle to adapt to heat exchange tubes at different angles.

[0047] Observe the flow of foam water on the heat exchange tubes. If there are defects in the heat exchange tubes such as corrosion, perforation, cracks, etc., the foam water will flow abnormally or accumulate at the defects.

[0048] By observing these abnormal phenomena, it is possible to accurately determine whether there are defects in the heat exchange tubes.

[0049] 3. Auxiliary institutions and functions

[0050] Fixed frame 41 and movable frame 42: The threaded rod 44 and the pulley 43 are used to realize the movement and positioning of the connecting seat 4, so as to facilitate the inspection of different heat exchange tubes.

[0051] Reciprocating screw 51 and folding airbag 53: Through the rotation of the reciprocating screw 51, the slider 54 is driven to reciprocate in the stroke groove 52, so that the folding airbag 53 continuously injects air into the water tank 5, increasing the air pressure in the water tank 5 to ensure that the foam water can be sprayed smoothly.

[0052] Sprocket 7 and chain: Through the transmission connection between the sprocket 7 and the chain, the synchronous movement of the driving source and the reciprocating screw rod 51 is achieved, ensuring the coordinated operation of the entire device.

[0053] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A device for inspecting defects of heat exchange tubes inside a slurry bed reactor, characterized in that: include: A reactor body (1) has a heat exchanger (2) symmetrically installed inside, and the heat exchanger (2) is composed of a plurality of dry in-line pipes; An air pump (3) is connected to one side of the heat exchanger (2) and is used to pressurize the interior of the heat exchanger (2) to a pressure of 0.4-0.7 MPa; The connecting seat (4) is mounted on the outer wall of the heat exchanger (2); a water tank (5) is fixedly connected to one side of the connecting seat (4); nozzles (6) are respectively provided on the connecting seat (4); the water tank (5) is connected to the nozzles (6); and foam water is filled in the water tank (5).

2. The device for inspecting defects of heat exchange tubes inside a slurry bed reactor according to claim 1, characterized in that: The connecting seat (4) is located between the fixed frame (41) and the movable frame (42), a threaded rod (44) is rotatably connected between the fixed frame (41) and the movable frame (42), a pulley (43) is rotatably connected inside the fixed frame (41) and the movable frame (42), a driving source is fixedly connected to one side of the movable frame (42), and the driving source is fixedly connected to the axis of the pulley (43) on the movable frame (42).

3. The device for inspecting defects of heat exchange tubes inside a slurry bed reactor according to claim 1, characterized in that: A reciprocating screw rod (51) is rotatably connected to one side of the water tank (5), a travel groove (52) is provided on one side of the water tank (5) close to the reciprocating screw rod (51), a folding air bag (53) is fixedly connected to the inner wall of the travel groove (52), a slider (54) is mounted on one end of the reciprocating screw rod (51), one end of the slider (54) is fixedly connected to the folding air bag (53), the bottom end of the folding air bag (53) is connected to the inside of the water tank (5), and the slider (54) reciprocates on the reciprocating screw rod (51), so that the folding air bag (53) continuously injects air into the water tank (5), thereby increasing the air pressure in the water tank (5).

4. The device for inspecting defects of heat exchange tubes inside a slurry bed reactor according to claim 3, characterized in that: The output end of the driving source and one end of the reciprocating screw rod (51) are both fixedly connected to a sprocket (7); a groove (8) is provided on one side of the fixed frame (41); a spring (9) is fixedly connected inside the groove (8); one end of the spring (9) is fixedly connected to a connecting block (10); one end of the connecting block (10) is rotatably connected to a tensioning sprocket (11); and the two sprockets (7) and the tensioning sprocket (11) are connected via a chain transmission.

5. The device for inspecting defects of heat exchange tubes inside a slurry bed reactor according to claim 3, characterized in that: The top and bottom ends of the folding airbag (53) are both provided with one-way valves. The one-way valve at the bottom of the folding airbag (53) prevents air leakage from the water tank (5), and the one-way valve at the top of the folding airbag (53) is used to replenish air to the folding airbag (53).

6. The device for inspecting defects of heat exchange tubes inside a slurry bed reactor according to claim 1, characterized in that: The nozzle (6) is designed to be an angle-adjustable nozzle so as to adapt to heat exchange tubes at different angles.

7. The device for inspecting defects of heat exchange tubes inside a slurry bed reactor according to claim 1, characterized in that: The inner wall of the in-line pipes of the heat exchanger (2) is coated with a corrosion-resistant and high-temperature-resistant coating to improve the durability and service life of the heat exchange pipes.

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