Pipeline connecting device for high temperature gas-cooled reactor

Abstract

The present invention relates to the technical field of reactor supporting equipment, and in particular to a pipeline connecting device for a high-temperature gas-cooled reactor. The pipeline connecting device for a high-temperature gas-cooled reactor comprises a ball-passing tube body, in which a ball-passing channel and a ball-discharging channel are arranged, and an angle is formed between the axis of the ball-passing channel and the axis of the ball-discharging channel; an elbow assembly is placed in the ball-passing tube body, and the elbow assembly is detachably connected between the ball-passing channel and the ball-discharging channel. The pipeline connecting device for a high-temperature gas-cooled reactor has a simple structure and is easy to disassemble. The pipeline connecting device can be flexibly removed as needed to clear the pipeline of the high-temperature gas-cooled reactor.

Description

Technical Field

[0001] The invention relates to the technical field of reactor supporting equipment, and in particular to a pipeline connecting device for a high-temperature gas-cooled reactor. Background Art

[0002] The pebble bed high temperature gas-cooled reactor is a fourth generation advanced reactor type with inherent safety features. It can achieve continuous operation without stopping the reactor through its fully automatic fuel loading and unloading system. The fuel loading and unloading system uses the favorable geometric shape of spherical fuel elements and adopts two spherical fuel element transportation methods to realize the circulation, loading and unloading operations of spherical fuel elements in the pressure pipeline system. One is to use the dead weight of the spherical elements to achieve gravity transportation, and the other is to use compressed gas to achieve pneumatic transportation.

[0003] Since the spherical elements of high-temperature reactors are spherical elements formed by isostatic pressing with graphite as the matrix, compared with the strong and tough steel pipelines and equipment, spherical elements are a hard and brittle non-metallic product. Among the tens of thousands, even hundreds of thousands or millions of discrete spherical elements, there are inevitably spherical elements with extremely small probability of shape and quality deviation. In high-temperature reactors of different projects, each spherical element usually undergoes 6 to 15 cycles through the core, and needs to flow and circulate in the core and fuel loading and unloading system for hundreds of days or even years. During this long process, the extrusion and flow of spherical elements in the core ball bed, especially the friction and collision in the steel pipelines of the fuel loading and unloading system, will inevitably cause a small probability of damage to some spherical elements, especially spherical elements with shape and quality deviations.

[0004] In the fuel loading and unloading system, a large number of spherical elements are discrete and random. In the gravity flow pipeline with a complex spatial layout containing a large number of equipment, it is difficult to absolutely eliminate the influence of broken balls, debris and dust, especially in the gravity flow pipeline with a small inclination angle and specific equipment. Blockage and its removal method are an issue that must be considered in advance. Because the fuel loading and unloading system is a fully automatic operation system distributed in the negative pressure ventilation cabin of the nuclear island, and has pressure and strong radioactivity. During the continuous operation of the reactor, the on-site cabin of the system is unmanned and uninspected. Once the ball flow pipeline or equipment is blocked, it is necessary to immediately and quickly perform the blockage fault removal operation, including system shutdown, switching cabin ventilation, equipment and pipeline pressure relief, local shielding and protection, fault investigation and removal, on-site and system recovery, and other series of work.

[0005] There are four solutions to clear the ball flow pipeline blockage. The first is online high-pressure blowing; the second is to open the nearest equipment on site and clear the blockage through the equipment opening; the third is to open the pre-installed flange short section or oblique tee on the pipeline and clear the blockage through the pipeline opening; the fourth is to cut the pipeline on site and clear the blockage by cutting.

[0006] However, the first solution requires a dedicated online piping system and equipment, which is not only complex and costly, but can only be purged on specific pipelines. If the blockage is severe or the purging direction is inappropriate, the blockage will fail to be cleared.

[0007] With respect to pipelines, due to the complexity of the equipment structure, the second solution can usually only be used to address equipment blockages, and cannot resolve the blockage problem of adjacent pipelines.

[0008] In the third solution, in order to ensure the smooth operation of the ball flow pipeline, the flange short section can only be set in a few positions; and the installation position and direction of the oblique tee also affect the ball flow transmission. The installation position is limited, and because the oblique tee has the problem of channel directionality, it can only be used to solve the pipeline blockage in a single direction, and the turning of the channel may make it difficult to remove the blockage.

[0009] Due to the strong radioactivity of the spherical elements, as well as the complexity and space limitations of the installation of the spherical flow pipeline and its equipment, it is very difficult to implement pipeline cutting on site in the fourth solution, and the pipeline restoration is also difficult. Summary of the invention

[0010] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a pipeline connecting device for a high temperature gas-cooled reactor with a simple structure and convenient disassembly, which can be flexibly disassembled as needed to clear the pipeline of the high temperature gas-cooled reactor.

[0011] The present invention provides a pipeline connecting device for a high temperature gas-cooled reactor, comprising:

[0012] A ball passing tube body is provided with a ball-injection channel and a ball-outlet channel inside, and an angle is formed between the axis of the ball-injection channel and the axis of the ball-outlet channel;

[0013] The bend assembly is placed in the ball passing tube body, and the bend assembly is detachably connected between the ball-entry channel and the ball-exit channel.

[0014] Furthermore, the elbow assembly comprises:

[0015] A first bending member is provided with a first bending groove;

[0016] A second bending member is provided with a second bending groove;

[0017] The first curved groove and the second curved groove are spliced ​​to form a curved pipeline connected between the goal channel and the ball outlet channel.

[0018] Furthermore, there is a smooth transition between the goal-ball end of the curved pipe and the goal-ball channel; there is a smooth transition between the ball-outlet end of the curved pipe and the ball-outlet channel.

[0019] Furthermore, the first bending piece and / or the second bending piece is provided with a connecting hole for cooperating with a device for removing the bending assembly.

[0020] Furthermore, a countersunk hole is provided on the top of the ball tube body, the first bend member and the second bend member are placed in the countersunk hole, the countersunk hole upper cover is provided with a first flange, and a pressure ring is provided between the first flange and the bend member.

[0021] Furthermore, a first positioning hole is provided on the first bending piece and / or the second bending piece, a second positioning hole is provided on the pressure ring, and positioning pieces are passed through the first positioning hole and the second positioning hole to position the pressure ring with the first bending piece and / or the second bending piece.

[0022] Furthermore, the pressure ring is provided with a first mounting hole, the circumferential surface of the pressure ring is provided with an external thread, the inner wall of the countersunk hole is provided with an internal thread, and the pressure ring cooperates with the countersunk hole thread.

[0023] Furthermore, a through hole connected to the countersunk hole is provided on the first side portion of the ball tube body adjacent to the top, a second flange is provided on the through hole, an abutment column is provided on the second flange, the abutment column passes through the through hole and abuts against the outer wall of the first bending piece and / or the second bending piece.

[0024] Furthermore, the curvature radius of the curved pipe ranges from 45 mm to 65 mm.

[0025] Furthermore, at least one second side portion of the ball tube body adjacent to the first side portion is provided with a second mounting hole for mounting a clearing device.

[0026] The pipeline connecting device for high-temperature gas-cooled reactors provided by the present invention is applied to gravity flow pipelines. Since the gravity flow pipelines contain many equipment components that perform various transportation and conversion functions, a complex spatial layout pipeline system is formed. Ball elbows are generally included between the equipment and pipeline components in the gravity flow pipeline system. For spherical elements with a diameter of 60 mm and gravity flow pipelines with an inner diameter of 65 mm, in order to ensure smooth ball passing, the curvature radius of the elbow is usually required to reach 300 mm and 400 mm. The pipeline connecting device provided by the embodiment of the present invention has a compact structure, and the dimensions in three directions of space are all within the range of 250 mm to 400 mm. Therefore, it can be installed at the turning parts of key equipment and pipelines to replace specially customized ball elbows.

[0027] The pipeline connecting device for a high temperature gas-cooled reactor provided by an embodiment of the present invention is installed at the deflection position of the downward protruding pipeline of the gravity flow pipeline, and the coordination and smooth transition of the elbow assembly and the ball tube body are used to ensure the smooth flow of the ball flow under normal operating conditions, and will not cause adverse effects on the spherical elements and pipelines. When the upstream equipment or pipeline is blocked, the elbow assembly can be taken out, the pipeline unblocking tooling and tools are connected, and appropriate atmosphere isolation means are taken, so that the blockage of the upstream equipment and pipeline can be unblocked and released through the position of the elbow assembly and the ball channel. When the downstream equipment or pipeline is blocked, the elbow assembly can be taken out, the pipeline unblocking tooling and tools are connected, and appropriate atmosphere isolation means are taken, so that the blockage of the downstream equipment and pipeline can be unblocked and released through the position of the elbow assembly and the ball outlet channel. Since blocking is an extremely low probability event, the pipeline connecting device provided by the embodiment of the present invention is significantly superior to the complex and large online high-pressure purge system with complex process, structure and control flow in terms of construction, operation and maintenance costs, and blockage release reliability. Moreover, the pipeline connecting device provided by the embodiment of the present invention does not need to open the related equipment with complex structure for time-consuming and laborious on-site operation; there is no need to cut the pipeline on-site, thus ensuring the safety of on-site operation and the efficiency of subsequent pipeline recovery. In addition, compared with flange nipples and oblique tees, the pipeline connecting device provided by the embodiment of the present invention can be more conveniently and quickly connected to special jam release tools and atmosphere isolation facilities, and has a more reliable two-way jam release interface and channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic side cross-sectional view of a pipeline connecting device for a high temperature gas-cooled reactor provided by an embodiment of the present invention;

[0029] Figure 2 A schematic front cross-sectional view of a pipeline connecting device for a high temperature gas-cooled reactor provided by an embodiment of the present invention;

[0030] Figure 3 A schematic cross-sectional view of a ball tube provided in an embodiment of the present invention;

[0031] Figure 4 A schematic bottom view of a ball-passing tube provided in an embodiment of the present invention;

[0032] Figure 5 A schematic top view of a ball-passing tube provided in an embodiment of the present invention;

[0033] Figure 6 A schematic side view of a ball-passing tube provided in an embodiment of the present invention;

[0034] Figure 7 A schematic front view of an elbow assembly provided in an embodiment of the present invention;

[0035] Figure 8 A schematic side view of an elbow assembly provided in an embodiment of the present invention;

[0036] Fig. 9 A schematic top view of an elbow assembly provided in an embodiment of the present invention;

[0037] Fig.10 A schematic front view of a pressure ring provided in an embodiment of the present invention.

[0038] Description of Figure Numbers:

[0039] 100, ball tube body; 102, ball entry channel; 104, ball exit channel; 106, bend assembly; 108, first bend member; 110, first bend groove; 112, second bend member; 114, second bend groove; 116, connecting hole; 118, countersunk hole; 120, first flange; 122, pressure ring; 124, first positioning hole; 126, second positioning hole; 128, through hole; 130, second flange; 132, abutment column; 134, second mounting hole; 136, disassembly and assembly process hole; 138, bend pipeline; 140, inner hole of pressure ring. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the invention clearer, the technical solution in the invention will be clearly described below in conjunction with the drawings in the invention. Obviously, the described embodiments are part of the embodiments of the invention, not all of the embodiments. Based on the embodiments in the invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the invention.

[0041] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0042] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0043] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0044] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0045] like Figures 1 to 10 As shown, the present invention provides a pipeline connecting device for a high-temperature gas-cooled reactor, including a ball-passing tube body 100, in which a ball-passing channel 102 and a ball-outlet channel 104 are arranged, and an angle is formed between the axis of the ball-passing channel 102 and the axis of the ball-outlet channel 104; an elbow component 106 is placed in the ball-passing tube body 100, and the elbow component 106 is detachably connected between the ball-passing channel 102 and the ball-outlet channel 104.

[0046] The pipeline connecting device for high-temperature gas-cooled reactors provided by the present invention is applied to gravity flow pipelines. Since the gravity flow pipelines contain many equipment components that perform various transportation and conversion functions, a complex spatial layout pipeline system is formed. Ball elbows are generally included between the equipment and pipeline components in the gravity flow pipeline system. For spherical elements with a diameter of 60 mm and gravity flow pipelines with an inner diameter of 65 mm, in order to ensure smooth ball passing, the curvature radius of the elbow is usually required to reach 300 mm and 400 mm. The pipeline connecting device provided by the embodiment of the present invention has a compact structure, and the dimensions in three directions of space are all within the range of 250 mm to 400 mm. Therefore, it can be installed at the turning parts of key equipment and pipelines to replace specially customized ball elbows.

[0047] The pipeline connecting device for a high temperature gas-cooled reactor provided in an embodiment of the present invention is installed at the turning position of the downward protruding pipeline of the gravity flow pipeline, and the coordination and smooth transition of the bend assembly 106 and the ball tube body 100 are used to ensure the smooth flow of the ball flow under normal operating conditions, and will not cause adverse effects on the spherical elements and pipelines. When the upstream equipment or pipeline is blocked, the bend assembly 106 can be taken out, the pipeline unblocking tool and tool are connected, and appropriate atmosphere isolation means are taken, and the blockage of the upstream equipment and pipeline can be unblocked and released through the position of the bend assembly 106 and the ball channel 102. When the downstream equipment or pipeline is blocked, the bend assembly 106 can be taken out, the pipeline unblocking tool and tool are connected, and appropriate atmosphere isolation means are taken, and the blockage of the downstream equipment and pipeline can be unblocked and released through the position of the bend assembly 106 and the ball outlet channel 104. Since jamming is an event with a very low probability, the pipeline connecting device provided by the embodiment of the present invention is significantly superior to the complex and bulky online high-pressure purge system in terms of construction, operation and maintenance costs, as well as jam removal reliability. Moreover, by using the pipeline connecting device provided by the embodiment of the present invention, there is no need to open the related equipment with complex structures for time-consuming and labor-intensive on-site operations; there is no need to perform on-site pipeline cutting, thereby ensuring the safety of on-site operations and the high efficiency of subsequent pipeline restoration. In addition, compared with flange nipples and oblique tees, the pipeline connecting device provided by the embodiment of the present invention can more conveniently and quickly connect special jam removal tools and atmosphere isolation facilities, and has a more reliable two-way jam removal interface and channel.

[0048] Specifically, the ball tube body 100 is used to accommodate a goal channel 102 and a ball outlet channel 104, wherein the goal channel 102 is connected to the pipeline of the upstream device, and the ball outlet channel 104 is connected to the pipeline of the downstream device. Moreover, in the embodiment of the present invention, in order to ensure that the spherical element can smoothly enter the ball outlet pipeline through the goal pipeline, there is an angle between the goal pipeline and the ball outlet pipeline. That is to say, in the embodiment of the present invention, the goal pipeline and the ball outlet pipeline are not on the same straight line, but are arranged to be inclined to each other. For example, the angle between the goal pipeline and the ball outlet pipeline can be 120 degrees.

[0049] The elbow assembly 106 is used to connect the ball-in-ball pipeline and the ball-out-ball pipeline, and the elbow assembly 106 is placed in the ball-through tube body 100. In order to facilitate the unblocking of the ball-in-ball pipeline or the ball-out-ball pipeline, in the embodiment of the present invention, the elbow assembly 106 is detachably connected to the ball-through tube body 100. That is, when the elbow assembly 106 is needed to connect the ball-in-ball pipeline and the ball-out-ball pipeline, the elbow assembly 106 can be installed in the ball-through tube body 100; when the ball-in-ball pipeline or the ball-out-ball pipeline needs to be unblocked, the elbow assembly 106 can be taken out of the ball-through tube body 100.

[0050] Furthermore, the bend assembly 106 includes a first bend member 108, which is provided with a first bend groove 110; a second bend member 112, which is provided with a second bend groove 114; the first bend groove 110 and the second bend groove 114 are spliced ​​to form a bend pipe 138 connected between the goal channel 102 and the ball outlet channel 104; the curvature radius of the bend pipe 138 ranges from 45 mm to 65 mm.

[0051] In the high-temperature reactor fuel loading and unloading system, in order to ensure smooth ball passage and not cause adverse friction and wear to the spherical components, strict requirements are imposed on the diameter and wall thickness of the ball path elbow, as well as the ovality and surface roughness of the channel, which are much greater than the national and international standards for industrial elbows and elbows. For this reason, the elbow assembly 106 can use a non-standard customized thick-walled tube as a blank, which is pushed and corrected in batches through multiple processes after mandrel extrusion and a series of hard steel balls of different diameters.

[0052] In other words, in the embodiment of the present invention, the bend assembly 106 cannot be directly formed in one step, but needs to be formed by splicing the first bend member 108 and the second bend member 112. The first bend member 108 and the second bend member 112 are respectively provided with a first bend groove 110 and a second bend groove 114. After the first bend member 108 and the second bend member 112 are spliced, the first bend groove 110 and the second bend groove 114 are spliced ​​to form a bend pipe 138 connected between the goal channel 102 and the ball outlet channel 104. That is, the bend pipe 138 is formed by machining or precision machining.

[0053] Due to the complexity of the manufacturing process, the elbow assembly 106 in the embodiment of the present invention has a compact structure, and the curvature radius of the elbow pipe 138 in the elbow assembly 106 is much smaller than the conventional 300 mm or 400 mm elbow. Specifically, the curvature radius of the elbow pipe 138 in the embodiment of the present invention ranges from 45 mm to 65 mm, and preferably, the curvature radius is 65 mm.

[0054] Furthermore, there is a smooth transition between the goal-ball end of the curved pipe 138 and the goal-ball channel 102 ; there is a smooth transition between the ball-outlet end of the curved pipe 138 and the ball-outlet channel 104 .

[0055] Therefore, when the spherical element passes between the goal end of the curved pipe 138 and the goal channel 102, and between the ball outlet end of the curved pipe 138 and the ball outlet channel 104, the spherical element will not be broken due to the collision between the curved pipe 138 and the goal channel 102 and the ball outlet channel 104, thereby ensuring the integrity of the spherical element. For example, in specific settings, the tangent of the goal end of the curved pipe 138 can be set to be in line with the tangent of the end of the goal channel 102, and the tangent of the ball outlet end of the curved pipe 138 can be set to be in line with the tangent of the end of the ball outlet channel 104 to achieve the above purpose.

[0056] Furthermore, the first elbow piece 108 and / or the second elbow piece 112 are provided with connection holes 116 for cooperating with a device for removing the elbow assembly 106 .

[0057] For example, after the first bend member 108 and the second bend member 112 are spliced ​​to form the bend pipe 138, the exterior of the bend assembly 106 is finely processed and formed. During the fine processing and forming process, a connection hole 116 for drawing and assembling is processed on the top surface joint line of the bend assembly 106. The connection hole 116 can be formed by forming half of the connection hole 116 on the first bend member 108 and the second bend member 112. When the bend assembly 106 needs to be taken out, a pulling device can be used to directly insert it into the connection hole 116 to take out the bend assembly 106.

[0058] Furthermore, a countersunk hole 118 is provided on the top of the ball tube body 100, and the first bend piece 108 and the second bend piece 112 are placed in the countersunk hole 118. The countersunk hole 118 is covered with a first flange 120, and a pressing ring 122 is provided between the first flange 120 and the bend assembly 106; the circumferential surface of the pressing ring 122 is provided with an external thread, and the inner wall of the countersunk hole 118 is provided with an internal thread, and the pressing ring 122 is threadedly matched with the countersunk hole 118; a first positioning hole 124 is provided on the first bend piece 108 and / or the second bend piece 112, and a second positioning hole 126 is provided on the pressing ring 122, and positioning pieces are passed through the first positioning hole 124 and the second positioning hole 126 to position the pressing ring 122 with the first bend piece 108 and / or the second bend piece 112.

[0059] For commercial high-temperature reactor nuclear power plants, there may be hundreds or even thousands of spherical elements passing through the pipeline connection device every day. Due to the frequent collision between the spherical elements and the elbow assembly 106, it is not only necessary to limit the circumferential displacement of the elbow assembly 106, but also to limit its axial movement, which is achieved by the pressure ring 122. The pressure ring 122 includes a pressure ring inner hole 140, a second positioning hole 126, a disassembly process hole 136, and an external thread set on the circumference of the pressure ring 122. The inner wall of the counterbore 118 of the ball tube body 100 is provided with a stopper and an internal thread.

[0060] During the assembly process of the pipeline connecting device of the embodiment of the present invention, the elbow assembly 106 is first accurately positioned in the counterbore 118, and then the press ring 122 is screwed into the internal thread of the counterbore 118 of the ball tube body 100 through the external thread by using the disassembly process hole 136 on the tooling and the press ring 122. After the press ring 122 presses the elbow assembly 106, the positioning piece is sequentially passed through the second positioning hole 126 of the press ring 122 and the first positioning hole 124 of the elbow assembly 106. Among them, the positioning piece performs the circumferential rotation positioning of the elbow assembly 106 on the one hand, and plays the function of preventing the external thread of the press ring 122 from loosening on the other hand.

[0061] By providing a first positioning hole 124 on the first bending member 108 and / or the second bending member 112, and providing a second positioning hole 126 on the pressure ring 122, and then passing the positioning member through the first positioning hole 124 and the second positioning hole 126 in sequence, the bending assembly 106 and the pressure ring 122 can be accurately positioned. The first positioning hole 124 can be provided on the first bending member 108 alone or on the second bending member 112 alone, or on both the first bending member 108 and the second bending member 112. The positioning member can be a positioning pin.

[0062] Furthermore, a through hole 128 connected to the countersunk hole 118 is provided on the first side portion adjacent to the top of the ball tube body 100, and a second flange 130 is provided on the through hole 128. An abutment column 132 is provided on the second flange 130. The abutment column 132 passes through the through hole 128 and abuts against the outer wall of the first bend piece 108 and / or the second bend piece 112.

[0063] On the pipeline connecting device, the first side adjacent to the top is not provided with a through hole 128 connected to the counterbore 118, and the abutment column 132 on the second flange 130 penetrates into the through hole 128 and abuts against the outer wall of the first bend 108 and / or the second bend 112. The axial thickness of the abutment column 132 and the thickness of the flange plate of the second flange 130 constitute a radioactive shielding protection for the upstream pipeline blocking spherical element in the direction of the through hole 128. The axial thickness of the bend assembly 106 and the thickness of the first flange 120 together constitute a radioactive shielding protection for the downstream pipeline blocking spherical element in the axial direction of the counterbore 118. Based on these two sets of shielding, the radioactive dose of the operator in the process of preparing the special tooling interface connection can be reduced.

[0064] Furthermore, at least one second side portion of the ball tube body 100 adjacent to the first side portion is provided with a second mounting hole 134 for mounting a clearing device.

[0065] Since the spherical elements of graphite matrix flow in the ball flow pipeline, as mentioned above, the collision and friction of the spherical elements in the steel equipment and pipeline will inevitably cause surface wear and generate dust, and the spherical elements have strong gamma-ray radioactivity, so the graphite dust will be contaminated and have low radioactivity. During the jamming removal operation, although the equipment and pipeline have been depressurized, these radioactive graphite dusts will still adhere to the surface of the equipment and pipeline or be suspended in the normal pressure air atmosphere. In order to avoid the internal irradiation caused by the operator inhaling these low-radioactive graphite dusts during the jamming operation, it is necessary to implement atmosphere isolation during the jamming operation. By setting a second mounting hole 134 on the second side adjacent to the first side on the ball tube body 100, it can be used to install atmosphere isolation facilities and connect and support special tooling.

[0066] The pipeline connecting device in this embodiment is further described below in conjunction with the specific working process.

[0067] The pipeline connecting device provided by the present invention is installed at the ball flow pipeline change position between two devices to replace the non-standard customized ball elbow at that location. When the pipeline or equipment is blocked, the ball detection devices upstream and downstream of the two devices can be used to preliminarily determine whether the blockage occurs in the upstream device or the downstream device, or in the upstream pipeline or the downstream pipeline.

[0068] If it is preliminarily determined that the problem is in the upstream pipeline or upstream equipment, the unblocking operation can be carried out after the system is shut down and the pipeline is depressurized, and access to the site is allowed.

[0069] First, the atmosphere isolation facility is installed on the pipeline connecting device using the second installation hole 134;

[0070] Secondly, the first flange 120, the pressure ring 122 and the elbow assembly 106 are disassembled under atmosphere isolation conditions, and then the first flange 120 is restored and tightened;

[0071] Again, under the condition of atmosphere isolation, open the second flange 130, support and connect the endoscope, and extend the endoscope into the upstream pipeline and equipment through the through hole 128, the counterbore 118 and the goal channel 102 to detect the blockage of the upstream pipeline and equipment;

[0072] Again, after withdrawing the endoscope, connect a lightweight offline high-pressure purge tool to purge the pipeline. If the blockage is removed, the blocked spherical element will flow to the downstream of the pipeline connecting device under its own weight after the purge. If the blockage cannot be removed, replace it with a mechanical dredging solution, that is, support and connect the mechanical dredging tool, extend the flexible tool with a certain rigidity through the through hole 128, the counterbore 118 and the goal channel 102, and after touching the blocked element, perform mechanical dredging. After the blockage is removed, the blocked spherical element will flow to the pipeline or equipment downstream of the pipeline connecting device under its own weight. If the downstream equipment and pipeline are no longer blocked, the tool can be removed to restore the pipeline and system operation.

[0073] If it is determined that the downstream equipment and pipeline are blocked, follow the steps below to remove the blockage:

[0074] First, the atmosphere isolation facility is installed on the pipeline connecting device using the second installation hole 134;

[0075] Secondly, under the atmosphere isolation condition, open the second flange 130, the pressure ring 122 and the elbow assembly 106;

[0076] Again, under the condition of atmosphere isolation, support and connect the endoscope, extend the endoscope through the countersunk hole 118 and the ball outlet channel 104 into the downstream pipeline and equipment, and detect the blockage of the downstream pipeline and equipment; after withdrawing the endoscope, support and connect the mechanical unblocking tooling, extend the flexible tooling with a certain rigidity through the countersunk hole 118 and the ball inlet and outlet channel 104, and perform mechanical unblocking after touching the blocked component. After the blockage is removed, the tooling can be removed to restore the pipeline and system operation.

[0077] If the spherical element after upstream jamming is broken and enters the downstream pipeline or equipment, or there is a broken spherical element in the downstream equipment and pipeline, connect the special suction jamming tooling, extend the suction head into the downstream pipeline and equipment, start the suction host to suck the broken element and transfer it to the external shielding tank;

[0078] Finally, dismantle the tooling, restore the pipeline sealing state, dismantle the atmosphere isolation facilities, and restore the system atmosphere and system operation.

[0079] It can be seen from the above embodiments that the pipeline connecting device provided by the present invention can reliably ensure the smooth flow of spherical elements during normal operation. During fault maintenance, the countersunk holes 118 and through holes 128 in two directions on the ball tube body 100 can be used in conjunction with special tooling and tools for blockage removal and pipeline dredging to safely and reliably solve the blockage of upstream pipelines and equipment, as well as the blockage of downstream equipment and pipelines. At the same time, the thickness of the first flange 120, the second flange 130 and the bend assembly 106 are used in two directions to realize radiation protection of operators during the preparation of the special tooling interface. In addition, the second mounting hole 134 on the ball tube body 100 can be used to install atmosphere isolation facilities and connect and support special tooling.

[0080] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A pipeline connecting device for a high temperature gas-cooled reactor, characterized in that: include: A ball passing tube body is provided with a ball-injection channel and a ball-outlet channel inside, and an angle is formed between the axis of the ball-injection channel and the axis of the ball-outlet channel; An elbow assembly is disposed in the ball-passing tube body, and the elbow assembly is detachably connected between the ball-entry passage and the ball-exit passage; The elbow assembly comprises: A first bending member is provided with a first bending groove; A second bending member is provided with a second bending groove; The first curved groove and the second curved groove are spliced ​​to form a curved pipeline connected between the goal channel and the ball outlet channel; A countersunk hole is provided on the top of the ball-passing tube body, a through hole connected to the countersunk hole is provided on the first side portion of the ball-passing tube body adjacent to the top, a second flange is provided on the through hole, an abutment column is provided on the second flange, the abutment column passes through the through hole and abuts against the outer side wall of the first bending member and / or the second bending member; The curvature radius of the curved pipe ranges from 45 mm to 65 mm.

2. The pipeline connecting device for a high temperature gas-cooled reactor according to claim 1, characterized in that: The goal-ball end of the curved pipeline and the goal-ball channel have a smooth transition; the ball-out end of the curved pipeline and the ball-out channel have a smooth transition.

3. The pipeline connecting device for a high temperature gas-cooled reactor according to claim 1, characterized in that: The first bending piece and / or the second bending piece are provided with connection holes for cooperating with equipment for taking out the bending assembly.

4. The pipeline connecting device for a high temperature gas-cooled reactor according to claim 1, characterized in that: The first bent-through component and the second bent-through component are placed in the countersunk hole, the upper cover of the countersunk hole is provided with a first flange, and a pressure ring is provided between the first flange and the bent-through component.

5. The pipeline connecting device for a high temperature gas-cooled reactor according to claim 4, characterized in that: A first positioning hole is provided on the first bending piece and / or the second bending piece, a second positioning hole is provided on the pressure ring, and positioning pieces are passed through the first positioning hole and the second positioning hole to position the pressure ring with the first bending piece and / or the second bending piece.

6. The pipeline connecting device for a high temperature gas-cooled reactor according to claim 4, characterized in that: The circumferential surface of the pressure ring is provided with an external thread, the inner side wall of the countersunk hole is provided with an internal thread, and the pressure ring is matched with the countersunk hole thread.

7. The pipeline connecting device for a high temperature gas-cooled reactor according to claim 1, characterized in that: At least one second side portion of the ball tube body adjacent to the first side portion is provided with a second mounting hole for mounting a clearing device.

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