A kind of trough type photo-thermal power station heat collection loop blockage dredging device and method

Abstract

The application discloses a kind of trough photothermal power station heat collection loop blockage dredging device and method, belong to the technical field of photothermal power station.A kind of trough photothermal power station heat collection loop blockage dredging device, comprising: vibrating element, the vibrating element is used to vibrate the heat collection pipe blocked, and the vibrating element is slidably arranged in the heat collection pipe outer;Mobile component, the mobile component includes the sliding block of slidingly arranged in heat collection pipe outer wall, the vibrating element is arranged on the sliding block;Connecting component, the connecting component includes connecting ring, the connecting ring can be detachably connected to heat collection pipe outer, the mobile component includes the first drive source for driving the sliding block movement and is arranged on the connecting ring.The application improves the problem of heat collection loop blockage, improves the service life of heat collector.

Description

Technical Field

[0001] This application relates to the technical field of solar thermal power plants, and in particular to a device and method for unblocking the heat collection circuit of a parabolic trough solar thermal power plant. Background Technology

[0002] With increasingly stringent environmental protection requirements and the growing maturity of concentrated solar power (CSP) technology, CSP plants have become an emerging market in the power industry. CSP technology relies on heliostats to concentrate direct solar radiation, then collects heat by heating a fluid working medium, and finally generates high-temperature steam through heat exchange to drive a turbine to generate electricity. Based on different solar energy collection methods, CSP plants can be classified into four types: tower, trough, Fresnel, and disc.

[0003] For parabolic trough solar thermal power plants, the mirror field consists of a large number of collectors connected in series and parallel. Each collector is 150 meters long, and four collectors are connected in series to form a collection loop (LOOP). Depending on the capacity of the power plant, multiple collection loops are connected in parallel to form the entire mirror field. Generally, a 50MW parabolic trough solar thermal power plant is equipped with 160-200 collection loops.

[0004] However, in related technologies, due to the relatively small diameter of the heat collection tubes in each heat collection circuit, and the isolation valve, regulating valve, and rotary joint installed at the inlet and outlet of each circuit, improper adjustment of individual heat collection circuits during long-term operation of the power plant can lead to low heat transfer oil flow. After heat collection, the tube wall overheats, causing the heat transfer oil to crack and harden, forming coke deposits. The low circuit flow and poor fluidity of the heat transfer oil exacerbate the accumulation of deposits, resulting in blockages in the heat collection circuit at bends. This causes frequent activation of the heat collector overheat protection, a sharp increase in the number of times the hydraulic oil station motor starts, and the heat collector to be ineffective operation. If not dealt with in time, it will cause serious failures such as accelerated aging of the rotating parts and heat collection tubes of the heat collector. Summary of the Invention

[0005] In order to improve the problem of blockage in the solar collector circuit and extend the service life of the solar collector, this application provides a device and method for unblocking the solar collector circuit of a parabolic trough solar thermal power plant.

[0006] In a first aspect, this application provides a blockage clearing device for a parabolic trough solar thermal power plant, comprising: A vibration element, the vibration element being used to vibrate a blocked heat collection tube, and the vibration element being slidably disposed outside the heat collection tube; A movable component, the movable component including a slider slidably disposed on the outer wall of the heat collection tube, and the vibration element disposed on the slider; A connecting assembly, the connecting assembly including a connecting ring detachably connected to the outside of the heat collection tube, and a moving assembly including a first driving source disposed on the connecting ring for driving the slider to move.

[0007] By adopting the above technical solution, the connecting ring is sleeved on the heat collection tube, thereby fixing the first driving source on the heat collection tube. The first driving source can drive the slider to move. During the movement, the vibrating element can vibrate, thereby clearing the blockage in the heat collection tube.

[0008] Optionally, the connecting ring includes a first half-ring and a second half-ring; both the first half-ring and the second half-ring are sleeved on the heat collection tube, and the first half-ring and the second half-ring are hinged at one end and detachably connected at the other end.

[0009] By adopting the above technical solution, the vibration element can be quickly installed on the heat collection tube by disassembling the first half-ring and the second half-ring, which facilitates the unblocking of different parts of the heat collection tube; and the first half-ring and the second half-ring can be used for heat collection tubes of different diameters, which can improve the applicability of this device.

[0010] Optionally, two connecting rings are provided, with the first driving source located on one connecting ring; The moving component also includes: A lead screw, one end of which is connected to the output end of the first drive source, the lead screw passes through the slider and is threadedly connected to the slider, and the other end of the lead screw is connected to another connecting ring; A guide rod passes through the slider, and both ends of the guide rod are connected to two connecting rings.

[0011] By adopting the above technical solution, when the first driving source drives the lead screw to rotate, it can drive the slider to slide along the length of the heat collection tube, thereby enabling different parts of the heat collection tube to vibrate one by one; and the guide rod can both guide the slider and make the slider stick to the heat collection tube, thus improving the vibration effect.

[0012] Optionally, the blockage clearing device for the parabolic trough solar thermal power plant further includes a drilling assembly, which comprises: The second driving source is slidably disposed at one end of the heat collection tube and moves along the axial direction of the heat collection tube. A drill bit is connected to the output end of the second drive source, and the second drive source drives the drill bit to rotate.

[0013] By adopting the above technical solution, when the second driving source slides at one end of the heat collection tube, it can drive the drill bit to extend into the heat collection tube, thereby drilling out the blockage in the heat collection tube, which is suitable for clearing blockages with a large degree of blockage.

[0014] Optionally, the drilling assembly further includes: A support plate, which is connected to the second drive source, moves axially along the heat collection tube; A support rod, one end of which is connected to the support plate, and the other end of which passes through the flange of the heat collection tube.

[0015] By adopting the above technical solution, the support rod is inserted into the flange, and the support rod can provide support force to the support plate. The support plate can provide support force to the second drive source, which is beneficial for the drill bit to drill out the blockages in the heat collection tube.

[0016] Optionally, the drilling assembly further includes: A connecting rod, one end of which is disposed on the support plate, and the other end of which is connected to the slider.

[0017] By adopting the above technical solution, when the slider slides along the length of the heat collection tube, the slider pulls the second drive source to move synchronously through the connecting rod. At this time, the second drive source is turned on, and the vibrating element vibrates on the outside of the heat collection tube while the drill bit drills in the inner layer of the heat collection tube, which can improve the unblocking effect.

[0018] Secondly, this application also provides a method for unblocking a parabolic trough solar thermal power plant, comprising: S1: Determine if the heat collection circuit is blocked; S2: Determine the location of the blockage in the collector tube; S3: Analyze the degree of blockage; S4: Determine the dredging plan; if the flow level is greater than level 2, use online dredging; if the flow level is less than or equal to level 2, use offline dredging.

[0019] By adopting the above technical solution, the blockage in the heat collection circuit is first identified, then the location of the blockage in the heat collection tube is found, the flow rate of the heat collection tube is measured, and a clearing plan is determined based on the flow rate level.

[0020] Optionally, pretreatment is required before online unblocking to detect the working status of the heat collection circuit; The aforementioned device for clearing blockages in the collector circuit of a solar thermal power plant is installed on the collector tube that has become blocked.

[0021] By adopting the above technical solution, for cases where the flow rate of the heat collection tube is greater than level two, pretreatment is first performed to check the working status of the heat collection circuit, and then a dredging device is installed for dredging.

[0022] Optionally, before offline unblocking, the blocked collector pipe is disassembled, and the aforementioned unblocking device for the collector circuit of the solar thermal power plant is installed on the collector pipe.

[0023] By adopting the above technical solution, for cases where the flow rate of the collector tube is less than or equal to level two, the blocked collector tube is removed and a dredging device is installed to dredge it.

[0024] Optionally, the online unblocking sequence is performed in the direction of the reverse flow of the heat transfer oil.

[0025] By adopting the above technical solution, during online unblocking, since the flow rate is at level two or above, unblocking is carried out in the direction of the reverse flow of heat transfer oil. The unblocked blockage can be flushed away by the heat transfer oil in time, reducing the possibility of secondary blockage.

[0026] In summary, this application includes at least one of the following beneficial effects: 1. When the blockage inside the collector tube is relatively minor, the slider drives the vibrating element to move back and forth to clear the blockage in the collector tube online; 2. When the collector tube is severely blocked, the collector tube is divided into sections and removed. While the vibrating element vibrates, the slider pulls the drill bit to drill and excavate the blockage, so as to clear the collector tube offline. 3. Different treatment measures are taken for different flow rates, which can effectively deal with the blockage of the heat collection tubes. Attached Figure Description

[0027] Figure 1 This is a flowchart of the method for unblocking the heat collection circuit of a parabolic trough solar thermal power plant according to Embodiment 1 of this application; Figure 2 This is a schematic diagram illustrating the heat collection circuit in Embodiment 1 of this application; Figure 3 This is an overall schematic diagram of the unblocking device for the collector circuit of a parabolic trough solar thermal power plant, as described in Embodiment 2 of this application. Figure 4 This is an exploded schematic diagram of the unblocking device for the collector circuit of a parabolic trough solar thermal power plant, as described in Embodiment 2 of this application. Figure 5 yes Figure 4 An enlarged schematic diagram of part A in the middle; Figure 6 This is a schematic diagram of the installation location of the unblocking device for the collector circuit of the parabolic trough solar thermal power plant in Embodiment 3 of this application; Figure 7 This is a schematic diagram illustrating the drilling assembly in Embodiment 3 of this application.

[0028] Explanation of reference numerals in the attached drawings: 100, solar collector; 101, first solar collector; 102, second solar collector; 103, third solar collector; 104, fourth solar collector; 200, solar collector tube; 201, first solar collector tube; 202, second solar collector tube; 300, vibration zone; 301, first vibration zone; 302, second vibration zone; 303, third vibration zone; 304, fourth vibration zone; 305, fifth vibration zone; 306, sixth vibration zone; 400, isolation valve; 500. Regulating valve; 1. Connecting assembly; 11. Connecting ring; 111. First half-ring; 112. Second half-ring; 12. Connecting bolt; 2. Moving assembly; 21. First drive source; 22. Base plate; 23. Lead screw; 24. Support seat; 25. Slider; 26. Guide rod; 27. Protective shell; 3. Vibration element; 4. Drilling assembly; 41. Support plate; 42. Second drive source; 43. Drill bit; 44. Support rod; 45. Connecting rod; 46. Baffle plate. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0030] Example 1: Embodiment 1 of this application discloses a method for unblocking the heat collection circuit of a parabolic trough solar thermal power plant.

[0031] Reference Figure 1 and Figure 2 The heat collection circuit includes a heat collection pipe 200, an isolation valve 400, and a regulating valve 500. A method for unblocking a blockage in the heat collection circuit of a parabolic trough solar thermal power plant includes: S1: identifying the blocked heat collection circuit; S2: identifying the location of the blockage in the heat collection pipe 200; S3: analyzing the degree of blockage; and S4: determining an unblocking plan.

[0032] Reference Figure 1 Step S1: Identify the blocked heat collection circuit. In step S1, it is necessary to determine the blocked heat collection circuit. The determination method is as follows: (1) The judgment is made based on the temperature rise rate of the first collector 101 to the fourth collector 104.

[0033] The heat transfer oil flows from the first collector 101 to the fourth collector 104 through the collector tube 200. If the collector tube 200 is not blocked, the temperature of the heat transfer oil flowing through it should gradually increase. However, if a collector circuit becomes blocked, the temperature rise rate of that collector circuit will be much higher than that of other collector circuits. Therefore, the blocked collector circuit can be found based on the temperature rise rate.

[0034] (2) The judgment is made based on the number of times the temperature protection devices of the first collector 101 to the fourth collector 104 are activated.

[0035] The solar collector 100 is generally equipped with a temperature protection device. When the temperature of the solar collector circuit is normal, the temperature protection device generally does not activate. However, when a blockage occurs in the solar collector circuit, the temperature protection device of that circuit will activate frequently to lower the temperature of the solar collector 100, thereby protecting the solar collector 100. Therefore, the number of times the temperature protection device of the solar collector 100 is activated can be used to determine which solar collector circuit is blocked.

[0036] (3) The judgment is made based on the number of motor starts of the hydraulic oil station of the first collector 101 to the fourth collector 104.

[0037] When the heat collection circuit is functioning normally, the motor of the hydraulic oil station in that circuit generally does not start. When a blockage occurs in a heat collection circuit, the flow rate in that circuit decreases. To maintain the flow pressure of the heat transfer oil, the motor of the hydraulic oil station in the heat collector 100 starts to increase the pressure. Therefore, the blocked heat collection circuit can be identified based on the number of times the hydraulic oil station motor starts.

[0038] (4) Use an ultrasonic flow meter to test the heat collection circuit.

[0039] By measuring the flow rate of the heat collection circuit using an ultrasonic flow meter, the flow rate of the heat collection circuit can be obtained. The flow rate of the blocked heat collection circuit is much lower than that of other heat collection circuits, thus the blocked heat collection circuit can be identified by the ultrasonic flow meter.

[0040] When determining a blocked heat collection circuit, only one of the above four methods needs to be selected to determine the blocked heat collection circuit. In other embodiments of this application, the other three methods can also be used to assist in determining the blocked heat collection circuit.

[0041] Reference Figure 1 Step S2: Identify the blocked collector tube 200. A blocked collector circuit may have multiple collector tubes 200. It is necessary to pinpoint the exact location of the blockage within the collector tube 200. The identification method is as follows: (1) Use a listening rod to judge based on the throttling sound of the heat collection tube 200.

[0042] By using a listening rod to measure different heat collection tubes 200 in the same heat collection circuit, the specific location of the blockage in the heat collection tube 200 can be detected based on the sound of the blockage.

[0043] (2) Measure the temperature difference between adjacent collectors 100 to determine which collector tube 200 is blocked.

[0044] When a collector tube 200 becomes blocked, the downstream flow of the collector tube 200 decreases, causing the temperature of the collector 100 downstream of the collector tube 200 to be too high. By measuring the temperature difference between adjacent collectors 100 and determining whether it meets the normal temperature rise rate, the location of the blocked collector tube 200 can be determined.

[0045] (3) Conduct key measurements on the heat collection tubes 200 between adjacent isolation valves, between the isolation valve and the regulating valve 500, and at the elbows.

[0046] For the collector tube 200, blockages are prone to occur between adjacent isolation valves, between the isolation valve and the regulating valve 500, and at bends, and these blockages are difficult to clear. By focusing on measuring these areas, the blocked collector tubes 200 can be located more quickly.

[0047] Reference Figure 1 Step S3: Analyze the degree of blockage.

[0048] In this embodiment, the normal flow rate of the heat collector 200 is 25m³ / h. 3 / h, establish congestion flow levels based on normal flow, as follows: First-level flow rate K1: K1 = 0 m 3 / h; Secondary flow rate K2: 0m 3 / h<K2≦5m 3 / h; Level 3 flow rate K3: 5m 3 / h<K3≦10m 3 / h; Level 4 flow rate K4: 10m 3 / h<K4≦15m 3 / h; Level 5 flow rate K5: 15m 3 / h<K5≦20m 3 / h.

[0049] Among them, 20m 3 / h-25m 3 The flow rate per hour is the allowable flow rate fluctuation error for the 200 heat collector tube.

[0050] Reference Figure 1 and Figure 2 Step S4: Determine the dredging plan.

[0051] In this embodiment, the heat collection circuit includes a main pipe for incoming oil and a main pipe for returning oil. The heat collector 100 is divided into a first heat collector 101, a second heat collector 102, a third heat collector 103, and a fourth heat collector 104.

[0052] If the flow level is level 2 or above, online drainage will be used; if the flow level is level 2 or below, offline drainage will be used.

[0053] Online unblocking: First, pretreatment is required: check the control system of the heat collection circuit, check the thermal measurement points of the heat collection circuit, check the inlet filter of the heat transfer oil circulation pump, the filter differential pressure gauge and the heat transfer oil circulation pump, and check the purification device.

[0054] After pretreatment, the unblocking device of this application is installed on the blocked collector tube 200 for vibration unblocking. If there are multiple blockages in a collector circuit, vibration is required in the direction from the fourth collector 104 to the first collector 101, i.e., unblocking is performed against the direction of heat transfer oil flow. Since the flow rate is above level two, unblocking in the direction against the heat transfer oil flow ensures that the unblocked blockages are promptly flushed away by the heat transfer oil, reducing secondary blockages.

[0055] Offline unblocking: The collector pipes 200 near adjacent isolation valves, between isolation valves and regulating valves 500, and near bends are more prone to blockage. When blockages occur, the flow rate is generally low, making unblocking more difficult. These areas of the collector pipes 200 are designated as vibration zones 300, which include the first vibration zone 301, the second vibration zone 302, the third vibration zone 303, the fourth vibration zone 304, the fifth vibration zone 305, and the sixth vibration zone 306.

[0056] The collector tubes 200 in each vibration zone 300 are segmented and connected by flanges. When a blockage occurs in a collector tube 200 in vibration zone 300, the unblocking device of this application is installed for vibration unblocking. If multiple blockages occur, vibration is first performed in the direction from the first vibration zone 301 to the sixth vibration zone 306. If it is difficult to unblock by vibration, the isolation valve near the blocked collector tube 200 is closed, and leakage monitoring and isolation measures are implemented for the unblocking circuit. The blocked collector tube 200 is removed in the direction from the sixth vibration zone 306 to the first vibration zone 301. One end of the removed collector tube 200 is connected to a high-pressure water source, and the unblocking device of this application is used to simultaneously vibrate and drill to unblock the obstruction.

[0057] Example 2: Embodiment 2 of this application discloses a device for unblocking the heat collection circuit of a parabolic trough solar thermal power plant.

[0058] refer to Figure 3A device for unblocking a blockage in the collector circuit of a parabolic trough solar thermal power plant includes a connecting component 1, a moving component 2, and a vibrating element 3. The collector tube 200 includes a first collector tube 201, the connecting component 1 is disposed on the first collector tube 201, the moving component 2 is disposed on the connecting component 1, and the vibrating element 3 is disposed on the moving component 2. The moving component 2 can drive the vibrating element 3 to move.

[0059] refer to Figure 3 and Figure 4 The connecting assembly 1 includes a connecting ring 11 and a connecting bolt 12. The connecting ring 11 is circular. In this embodiment, two connecting rings 11 are spaced apart, and both connecting rings 11 are sleeved on the first heat collector tube 201. The connecting ring 11 is divided into a first half-ring 111 and a second half-ring 112. One end of the first half-ring 111 and the second half-ring 112 are hinged, and the other end has a raised edge on which the connecting bolt 12 passes. The first half-ring 111 and the second half-ring 112 can rotate relative to each other around the hinge axis and are then locked by the connecting bolt 12, thereby fixing the connecting ring 11 to the first heat collector tube 201 and accommodating first heat collector tubes 201 of different diameters.

[0060] refer to Figure 4 and Figure 5 The moving component 2 includes a first driving source 21, a base plate 22, a lead screw 23, and a support base 24. The base plate 22 is plate-shaped, and two base plates 22 are provided, each corresponding to one of the two connecting rings 11. In this embodiment, the base plate 22 is detachably connected to the first half-ring 111 by bolts. In other embodiments of this application, the base plate 22 can also be detachably connected to the second half-ring 112. In this embodiment, the first driving source 21 is a motor, fixedly connected to one of the base plates 22, and the support base 24 is disposed on the other base plate 22. The axial direction of the lead screw 23 is the same as the length direction of the first heat collection tube 201. One end of the lead screw 23 is fixedly connected to the output shaft of the first driving source 21, and the other end is fixedly connected to the support base 24.

[0061] refer to Figure 4 and Figure 5 The moving component 2 also includes a slider 25, a guide rod 26, and a protective shell 27. The slider 25 is sleeved on and threadedly connected to the lead screw 23, and fits against the first heat-collecting tube 201. The guide rod 26 runs along the same length as the first heat-collecting tube 201, passes through the slider 25, and has multiple support seats 24. Both ends of the guide rod 26 are fixedly connected to the substrate 22 via the support seats 24. Two protective shells 27 are provided, each corresponding to one of the two substrates 22, covering the two substrates 22 and providing protection.

[0062] refer to Figure 4The vibrating element 3 and the slider 25 are fixedly connected by bolts. The vibrating element 3 can be a pneumatic vibrator, an electromagnetic vibrator, a motor vibrator, or an ultrasonic vibrator.

[0063] The implementation principle of the device for unblocking the heat collection circuit of a trough solar thermal power plant in Embodiment 2 of this application is as follows: When the first driving source 21 drives the lead screw 23 to rotate, it can drive the slider 25 to slide along the length direction of the guide rod 26, start the vibration element 3, and vibrate the first heat collection tube 201. The heat transfer oil in the first heat collection tube 201 has a certain pressure, thereby unblocking the first heat collection tube 201.

[0064] Example 3: Embodiment 3 of this application discloses a device for unblocking the heat collection circuit of a parabolic trough solar thermal power plant.

[0065] refer to Figure 6 The difference between Embodiment 3 and Embodiment 2 is that the heat collection pipe 200 also includes a second heat collection pipe 202. The second heat collection pipe 202 is the heat collection pipe 200 between adjacent isolation valves, between the isolation valve and the regulating valve 500, and near the bend. The second heat collection pipe 202 is prone to blockage and is generally difficult to clear. Therefore, the first heat collection pipe 201 and the second heat collection pipe 202 are connected by a flange to facilitate disassembly and maintenance.

[0066] refer to Figure 7 A device for unblocking the heat collection circuit of a parabolic trough solar thermal power plant includes a drilling assembly 4, which includes a support plate 41 and a support rod 44. The support plate 41 is circular, and the support rod 44 passes through a flange and is fixedly connected to the support plate 41. A nut is provided at the end of the support rod 44 away from the support plate 41.

[0067] refer to Figure 7 The drilling assembly 4 also includes a second drive source 42 and a drill bit 43. In this embodiment, the second drive source 42 is a motor, and the second drive source 42 is fixedly connected to the support plate 41. The output end of the second drive source 42 passes through the support plate 41 and is fixedly connected to the drill bit 43, and the drill bit 43 is provided with helical blades on its circumferential wall.

[0068] refer to Figure 7 The drilling assembly 4 also includes a connecting rod 45 and a baffle 46. The length direction of the connecting rod 45 is the same as the length direction of the second heat collection tube 202. After passing through the support plate 41 and the flange, the connecting rod 45 is threadedly connected to the slider 25. The end of the connecting rod 45 away from the slider 25 is fixedly connected to the baffle 46. The diameter of the baffle 46 is larger than the diameter of the connecting rod 45.

[0069] The implementation principle of the device for clearing blockages in the collector circuit of a parabolic trough solar thermal power plant in Embodiment 3 of this application is as follows: when the second collector tube 202 is blocked, the connecting ring 11 is installed on the second collector tube 202, and the vibration element 3 is turned on to vibrate in order to clear the blockage. When the second heat collector 202 is difficult to clear by vibration, close the isolation valve and remove the second heat collector 202 from the adjacent first heat collector 201. Connect one end of the second heat collector 202 to a high-pressure water source, and then install the drilling assembly 4 at the other end of the second heat collector 202. When the slider 25 slides along the guide rod 26 away from the support plate 41, it can drive the support plate 41 to move together through the connecting rod 45. At this time, start the second drive source 42 to drill the blockage in the second heat collector 202, thereby clearing the blockage in the second heat collector 202.

[0070] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A device for unblocking blockages in the collector circuit of a parabolic trough solar thermal power plant, characterized in that: include: Vibration element (3), the vibration element (3) is used to vibrate the blocked heat collection tube (200), and the vibration element (3) is slidably disposed outside the heat collection tube (200); The moving component (2) includes a slider (25) that is slidably disposed on the outer wall of the heat collection tube (200), and the vibration element (3) is disposed on the slider (25); The connecting component (1) includes a connecting ring (11) which is detachably connected to the outside of the heat collection tube (200). The moving component (2) includes a first driving source (21) disposed on the connecting ring (11) for driving the slider (25) to move. The device for clearing blockages in the solar thermal power plant's collector circuit also includes a drilling assembly (4), which comprises: The second driving source (42) is slidably disposed at one end of the heat collection tube (200), and the second driving source (42) moves along the axial direction of the heat collection tube (200); Drill bit (43), the drill bit (43) is connected to the output end of the second drive source (42), the second drive source (42) drives the drill bit (43) to rotate; The drilling assembly (4) also includes: A support disk (41) is connected to the second drive source (42), and the support disk (41) moves axially along the heat collection tube (200); Support rod (44), one end of which is connected to the support plate (41), and the other end of which is inserted into the flange of the heat collection tube (200); The drilling assembly (4) also includes: A connecting rod (45) is provided at one end on the support plate (41) and at the other end is connected to the slider (25).

2. The device for unblocking the heat collection circuit of a parabolic trough solar thermal power plant according to claim 1, characterized in that: The connecting ring (11) includes a first half-ring (111) and a second half-ring (112); the first half-ring (111) and the second half-ring (112) are both sleeved on the heat collection tube (200), and the first half-ring (111) and the second half-ring (112) are hinged at one end and detachably connected at the other end.

3. The device for unblocking the heat collection circuit of a parabolic trough solar thermal power plant according to claim 1, characterized in that: There are two connecting rings (11), and the first driving source (21) is located on one of the connecting rings (11); The moving component (2) also includes: A lead screw (23) is provided, one end of which is connected to the output end of the first drive source (21), the lead screw (23) passes through the slider (25) and is threadedly connected to the slider (25), and the other end of the lead screw (23) is connected to another connecting ring (11). Guide rod (26) passes through slider (25), and the two ends of guide rod (26) correspond to and are connected to two connecting rings (11).

4. A method for unblocking the heat collection circuit of a parabolic trough solar thermal power plant, characterized in that: include: S1: Determine if the heat collection circuit is blocked; S2: Determine the location of the blockage in the collector tube (200); S3: Analyze the degree of blockage; S4: Determine the unblocking plan; install the unblocking device for the collector circuit of the solar thermal power plant as described in any one of claims 1-3 on the blocked collector tube (200); if the flow rate is greater than level 2, use the online unblocking method; if the flow rate is less than or equal to level 2, use the offline unblocking method.

5. The method for unblocking the heat collection circuit of a parabolic trough solar thermal power plant according to claim 4, characterized in that: The online unblocking process is carried out in the direction of the reverse flow of the heat transfer oil.

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