CN115295186A - Maintenance method of reactor, compensation ring and reactor - Google Patents

Abstract

The invention relates to a maintenance method of a reactor, which comprises the following steps: removing the worn heat sleeve in the pipe seat; fixing the compensation ring on the seat surface of the tube seat, and installing a new heat sleeve in the tube seat to enable the upper end surface of the compensation ring to be abutted against the outer contact surface at the upper end of the heat sleeve; alternatively, the compensating ring is fixed on the outer contact surface of the upper end of the new thermal bushing and both are mounted together in the socket. The maintenance method of the reactor avoids replacing the tube seat and even the whole top cover, is convenient to operate, and the compensation ring compensates the abrasion part of the tube seat, so that a new hot sleeve is positioned at the working position of the new hot sleeve, and the reactor pressure vessel can work normally.

Description

Maintenance method of reactor, compensation ring and reactor

Technical Field

The invention relates to the technical field of reactor pressure equipment, in particular to a reactor maintenance method, a compensation ring and a reactor.

Background

The top cover of the reactor pressure vessel is used for plugging the reactor pressure vessel. The top cap includes integrated into one piece's top cap body and tube socket, and the tube socket wears to locate the top cap body, and the upper segment of tube socket is located reactor pressure vessel outside, and the hypomere of tube socket is located reactor pressure vessel inside. The upper end surface of the pipe seat is a flange surface, and the flange surface is higher outside and lower inside along the axial direction of the pipe seat. The heat sleeve is arranged in the pipe seat, and the outer contact surface at the upper end of the heat sleeve is abutted to the flange surface, so that the heat sleeve is suspended in the pipe seat.

The thermal sleeve is a guide sleeve device for restricting the flow of hot water inside the pressure vessel of the reactor, and when the hot water flows through the thermal sleeve, the vibration of the water flow can cause the thermal sleeve to move along the axial direction of the tube socket and/or rotate along the circumferential direction of the tube socket. When the heat pipe moves or rotates, the outer contact surface rubs against the flange surface, resulting in frictional wear of the outer contact surface and/or the flange surface. Long-time friction and abrasion can cause partial materials of the outer contact surface and/or the flange surface to fall off, so that the hot sleeve moves downwards, in the severe case, the flaring-shaped upper end part of the hot sleeve can be worn out and falls off, and the falling part can fall over a channel opening in the hot sleeve, so that a control rod driving mechanism in the channel is moved and jammed, and an emergency shutdown event is caused.

Disclosure of Invention

Based on this, it is necessary to provide a reactor maintenance method for solving the problems that the material of the external contact surface and/or the flange surface falls off due to long-time friction and wear, so that the heat jacket moves down, and in severe cases, the flared upper end of the heat jacket is worn out and falls off, and the fallen part may fall over a channel opening inside the heat jacket, so that a control rod driving mechanism in the channel moves and is jammed, and an emergency shutdown event is caused.

An embodiment of the present application provides a maintenance method for a reactor, where the maintenance method for a reactor includes:

removing the worn hot sleeve in the pipe seat;

a compensating ring and a new heat jacket tube are provided, the compensating ring passing through the new heat jacket tube and being arranged between the outer contact surface of the upper end of the new heat jacket tube and the seat surface of the socket to compensate for wear subsidence between the heat jacket tube and the socket.

When the maintenance method of the reactor is used for treating the worn thermal sleeve and the worn tube seat, firstly, the worn thermal sleeve is removed, the compensation ring is fixed with the seat surface of the tube seat or the outer contact surface of the newly-provided thermal sleeve, the compensation ring is arranged between the seat surface of the tube seat and the outer contact surface of the upper end part of the thermal sleeve, the abrasion sinking amount between the thermal sleeve and the tube seat is compensated, and the compensated tube seat and the compensation ring are used for supporting the upper end of the new thermal sleeve and are matched with the new thermal sleeve. The method avoids replacing the tube seat and even the whole top cover, is convenient to operate, and the compensation ring compensates the abrasion sinking amount between the hot sleeve and the tube seat, so that the new hot sleeve is positioned at the working position of the new hot sleeve, and the reactor pressure vessel can work normally.

In one embodiment, the compensating ring is fixed on the seat surface of the tube seat, and a new thermal sleeve is arranged in the tube seat, so that the upper end surface of the compensating ring is abutted with the outer contact surface of the upper end part of the thermal sleeve; alternatively, the compensating ring is fixed on the outer contact surface of the upper end of the new heat pipe and both are mounted together in the pipe socket.

In one embodiment, the method for maintaining a reactor further comprises:

after the step of removing the worn-out heat jacket tube from the interior of the tube seat, the seat surface of the worn-out tube seat is machined to form a machined surface perpendicular to the axial direction of the tube seat, the lower end surface of the compensating ring abuts against the machined surface, and the upper end surface of the compensating ring is connected with the outer contact surface of the upper end portion of the heat jacket tube.

In one embodiment, the thermal sleeve comprises a thermal sleeve body and a guide cover, the upper end of the thermal sleeve is the upper end of the thermal sleeve body, and the lower end of the thermal sleeve body extends out of the tube seat and then is connected with the guide cover;

the step of removing the worn heat pipe inside the pipe socket comprises:

and cutting the joint of the guide cover and the heat sleeve body, and taking out the heat sleeve body from the upper end of the pipe seat.

In one embodiment, installing the new thermal sleeve comprises:

and providing a new thermal sleeve body, placing the new thermal sleeve body into the tube seat from the upper end of the tube seat, and connecting the lower end of the new thermal sleeve body with the guide cover.

An embodiment of the present application further provides a compensation ring, which is applied to the reactor maintenance method in any one of the above embodiments, and the compensation ring is annular and is installed between the outer contact surface of the thermal sleeve and the seat surface of the tube seat.

In one embodiment, the compensating ring comprises a base and a support part which are connected along the axial direction of the pipe seat and are respectively annular, the lower end surface of the base abuts on the processing surface, and the upper end surface of the support part abuts on the outer contact surface of the upper end of the heat sleeve.

In one embodiment, the base comprises a plurality of base portions which are individually preformed and arranged in a sequential manner along the axial direction of the header so that the base can be correspondingly fixed on the seat surface of the header or the outer contact surface of the upper end of the new thermal sleeve, respectively.

In one embodiment, the included angle between the upper end surface of the compensation ring and the central axis thereof is 135 degrees +/-2 degrees, and the upper end surface of the compensation ring is higher outside and lower inside.

The present application further provides a reactor comprising a reactor pressure vessel, a tube block, a thermal sleeve, and the compensating ring of any of the above embodiments.

Drawings

FIG. 1 is a schematic diagram of a reactor configuration;

FIG. 2 is a schematic view of the connections of the header, the thermal sleeve, the guide housing, the control rod guide tubes, the control rod drive mechanisms, and the header body of FIG. 1;

FIG. 3 is a schematic view showing the connection between the socket and the compensating ring of FIG. 1;

FIG. 4 is a flow chart of a method for maintaining a reactor according to an embodiment;

FIG. 5 is a flow diagram of removing an accessory device in one embodiment;

FIG. 6 is a flow chart illustrating disengagement of the CRDM from the nozzle base in one embodiment;

FIG. 7 is a flow chart of an embodiment of making a compensating ring based on wear dimensions of a socket.

Description of reference numerals:

a stem 110; processing a surface 101;

a thermal sleeve 120; an outer contact surface 104; a thermal sleeve body 121; a guide cover 122;

a compensation ring 130; an upper end surface 102 of the compensation ring; the lower end surface 103 of the compensation ring; a base 131; a support portion 132;

a cap body 210; a control rod guide tube 220; a control rod drive mechanism 230.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanying figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Referring to fig. 1-3, in a reactor, a top cover of a reactor pressure vessel is used for plugging the reactor pressure vessel. The top cover comprises a top cover body 210 and a tube seat 110 which are integrally formed, and the tube seat 110 penetrates through the top cover body 210. The thermal sleeve 120 is placed inside the socket 110, and the upper end of the thermal sleeve 120 abuts the upper end of the socket 110, so that the thermal sleeve 120 is suspended inside the socket 110. As the hot water flows through the heat sleeve 120, the vibration of the water flow may cause the heat sleeve 120 to move in the axial direction of the socket 110 and/or rotate in the circumferential direction of the socket 110. When the heat sleeve 120 moves or rotates, the abutting portion of the heat sleeve 120 and the socket 110 is rubbed, resulting in frictional wear at the abutting portion of the heat sleeve 120 and the socket 110. Long-term frictional wear may cause a portion of the material of the heat jacket tube 120 and/or the base 110 to fall off, thereby moving the heat jacket tube 120 downward, and thus moving the heat jacket tube 120 downward, and in severe cases, the flared upper end portion of the heat jacket tube 120 may be worn out and fall off, and the fallen portion may fall directly over the opening of the passage inside the heat jacket tube 120, causing the control rod driving mechanism 230 in the passage to move and jam, thereby causing an emergency shutdown event.

Referring to fig. 4, an embodiment of the present application provides a maintenance method for a reactor, including the following steps:

s110: the worn thermal sleeve 120 inside the header 110 is removed.

Specifically, the thermal sleeve 120 is located inside the socket 110, and the thermal sleeve 120 and/or the socket 110 are worn to some extent due to friction at the abutting position of the thermal sleeve 120 and the socket 110, so that the worn thermal sleeve 120 needs to be replaced, and the worn thermal sleeve 120 needs to be removed from the socket 120 to leave a space for installing a new thermal sleeve 120.

S120: a compensating ring 130 and a new thermal sleeve 120 are provided, the compensating ring 130 passing through the new thermal sleeve 120 and being disposed between an outer contact surface of an upper end portion of the new thermal sleeve 120 and a seating surface of the socket 110 to compensate for a wear sink between the original thermal sleeve 120 and the socket 110.

In this step S120, specifically, the compensating ring 130 and the new thermal sleeve 120 may be provided, and the compensating ring 130 passes through the thermal sleeve 120 and is disposed between the outer contact surface of the upper end portion of the new thermal sleeve 120 and the seat surface of the socket 110 to compensate for the wear sag between the thermal sleeve 120 and the socket 110.

In step S120, the compensating ring 130 is disposed between the outer contact surface of the upper end of the new thermal sleeve 120 and the seat surface of the socket 110, which may be specifically: the compensating ring 130 is fixed on the seat surface of the socket 110, and a new thermal sleeve 120 is mounted in the socket 110 such that the upper end surface 102 of the compensating ring 130 abuts against the outer contact surface 104 of the upper end of the thermal sleeve 120. It is also possible to fix the compensating ring 130 on the outer contact surface 104 of the upper end of the new thermal sleeve 120 and to mount both together into the socket 110, as long as the compensating ring 130 can be mounted.

Specifically, in the present embodiment, the compensating ring 130 is disposed on the seating surface of the socket 110, and a new thermal sleeve 120 is installed in the socket 110 such that the upper end surface 102 of the compensating ring 130 abuts against the outer contact surface 104 of the upper end of the thermal sleeve 120, whereby the compensating ring 130 compensates for the wear sink between the thermal sleeve 120 and the socket 110. The compensation ring 130 is provided to compensate for wear subsidence between the thermal sleeve 120 and the nozzle block 110 so that the compensated nozzle block 110 can support the upper end of the new thermal sleeve 120 so that the new thermal sleeve 120 is in its operating position and avoids causing jamming of the control rod drive mechanisms 230 and thus an emergency shutdown event.

In this embodiment, the compensating ring 150 may be fixed to the seat surface of the socket 110 by welding, or other fixing methods may be used as long as the compensating ring 150 can be fixed to the seat surface of the socket 110.

In this embodiment, the compensating ring 150 and the outer contact surface 104 of the upper end portion of the new thermal sleeve 120 may be fixed by welding, or may be fixed by another fixing method as long as the compensating ring 150 and the outer contact surface 104 of the upper end portion of the new thermal sleeve 120 can be fixed.

In the maintenance method of the reactor, when the worn thermal sleeve 120 and the worn tube seat 110 are disposed, the worn thermal sleeve 120 is firstly removed, the compensating ring 130 is fixed to the seat surface of the tube seat 110 or the outer contact surface 104 of the newly provided thermal sleeve 120, the compensating ring 130 is disposed between the seat surface of the tube seat 110 and the outer contact surface 104 of the upper end portion of the thermal sleeve 120, the wear sinking amount between the thermal sleeve 120 and the tube seat 110 is compensated, and the compensated tube seat 110 and the compensating ring 130 are used for supporting the upper end portion of the new thermal sleeve 120 and are matched with the new thermal sleeve 120. The method avoids replacing the tube seat 110 and even the whole top cover, is convenient to operate, and the compensation ring 130 compensates the abrasion sinking amount between the thermal sleeve 120 and the tube seat 110, so that the new thermal sleeve 120 is positioned at the working position, and the reactor pressure vessel can work normally.

In an embodiment, the method for maintaining a reactor further comprises: after step S110, the seat surface of the worn socket 110 is machined to form a machined surface 101 perpendicular to the axial direction of the socket 110, and in the assembled state of the heat pipe sleeve 120 and the compensating ring 130 to the socket 110, the lower end surface 103 of the compensating ring 130 abuts against the machined surface 101, and the upper end surface 102 of the compensating ring 130 abuts against the outer contact surface 104 at the upper end of the heat pipe sleeve 120.

Specifically, by machining the worn seat surface of the socket 110, the seat surface forms a machined surface 101 perpendicular to the axial direction of the socket 110, so that when the lower end surface 103 of the compensating ring 130 abuts against the machined surface 101, the lower end surface 103 of the compensating ring 130 is more attached to the machined surface 101, the lower end surface 103 of the compensating ring 130 can more reliably abut against the machined surface 101, and the situation that the compensating ring 130 is installed unreliably due to the fact that the seat surface has wear defects and unevenness is avoided.

Referring to fig. 7, in an embodiment, the step of machining the seat surface of the worn socket 110 to form a machined surface 101 perpendicular to the axial direction of the socket 110 includes:

s410: the seat surface of the socket 110 is ground and reshaped to obtain a machined surface 101 perpendicular to the axial direction of the socket 110, and the wear dimension of the ground and reshaped worn part of the socket 110 is measured.

S420: the compensating ring 130 is fabricated according to wear dimensions.

Specifically, since the seat surface of the socket 110 is worn out and has an indefinite shape and a wear defect such as a pot hole, the seat surface of the socket 110 needs to be polished and shaped first, so that the seat surface forms a machined surface 101 perpendicular to the axial direction of the socket 110, the machined surface 101 is more flat, the compensating ring 130 is convenient to mount, and the dimension to be compensated is convenient to measure. The seat surface of the tube seat 110 is polished and shaped, so that after the machined surface 101 is formed, the dimension of the machined surface 101 is measured, and the corresponding compensation ring 130 is manufactured according to the dimension, at the moment, the manufactured compensation ring 130 is matched with the corresponding tube seat 110, the installation and the fixation of the compensation ring on the tube seat 110 are stable, and therefore, the abrasion compensation effect on the tube seat is better.

In an embodiment, after step S410, the method for maintaining a reactor further includes: when the worn part of the pipe seat 110 is polished and shaped, metal dust is collected to ensure that no metal dust remains.

Particularly, since the requirement on the internal cleanliness of the reactor pressure vessel is high, foreign matters such as dust may affect the safe operation of the reactor, and therefore, the metal dust needs to be collected, and no metal dust is left, thereby preventing the safe operation of the reactor from being affected.

In one embodiment, before machining the seat surface of the worn tube seat 110 to form a machined surface 101 perpendicular to the axial direction of the tube seat 110, the method for maintaining the reactor further comprises: the ancillary equipment in the reactor that impedes the removal of the worn thermal sleeves 120 is removed. After step S120, the accessory device is reinstalled.

Specifically, since there are many accessories in the reactor, when the worn thermal sleeve 120 is removed, some of the accessories may hinder the removal process, and therefore, before the worn thermal sleeve 120 is removed, the accessories that hinder the removal of the worn thermal sleeve 120 need to be removed, so that the tube socket 110 is exposed, and the removal of the worn thermal sleeve 120 is facilitated. After the compensating ring 130 is installed and the new thermal sleeve 120 is replaced, the removed attachment is reinstalled so that the reactor can operate properly.

In this embodiment, the ancillary equipment includes cable trays, shock resistant plates, rod position measurement systems, drive coil assemblies, and lower shrouds of the control rod drive mechanisms 230, among others.

Referring to FIG. 5, in one embodiment, the step of removing the accessories in the reactor that hinder the removal of the worn thermal sleeves 120 includes:

s210: and (4) removing the cable bridge.

S220: dismantling the anti-seismic plate;

s230: removing the rod position measuring system;

s240: removing the drive coil assembly;

s250: the lower shroud of the crdm 230 is removed.

The step of detaching the auxiliary equipment is not fixed, and all the auxiliary equipment does not need to be detached in actual work as long as the worn heat sleeve is not influenced.

The steps are reversed when the accessory device is reinstalled.

Referring to fig. 2, in an embodiment, the thermal sleeve 120 includes a thermal sleeve body 121 and a guiding cover 122, an upper end of the thermal sleeve 120 is an upper end of the thermal sleeve body 121, and a lower end of the thermal sleeve body 121 extends out of the tube seat 110 and is connected to the guiding cover 122.

The step of removing the worn thermal sleeve 120 inside the socket 110 includes:

the junction of the guide cap 122 and the thermal sleeve body 121 is cut and the thermal sleeve body 121 is removed from the socket 110.

Specifically, the heat sleeve 120 includes a heat sleeve body 121 and a guide cover 122, the upper end of the heat sleeve 120 is the upper end of the heat sleeve body 121, that is, the outer contact surface 104 of the upper end of the heat sleeve body 121 abuts against the tube seat 110, during friction, the abutting part of the heat sleeve body 121 and the tube seat 110 is worn, the guide cover 122 does not participate in the friction process, and still remains complete, so that only the heat sleeve body 121 needs to be replaced, the guide cover 122 does not need to be replaced, and time and resources are saved.

In one embodiment, installing the new thermal sleeve 120 includes: providing a new thermal sleeve body 121, placing the new thermal sleeve body 121 from the upper end of the tube socket 110, and connecting the lower end of the new thermal sleeve body 121 with the guide cover 122, thereby forming a new thermal sleeve 120 to cooperate with the tube socket 110.

Of course, in other alternative embodiments, it is also possible to provide a new heat jacket body 121 and a new guide cap 122 and weld the heat jacket 120 in the above steps.

Referring to fig. 6, in an embodiment, before step S110, the method for maintaining a reactor further includes:

s310: the junction of the case of the crdm 230 and the socket 110 is cut such that the case of the crdm is separated from the socket 110.

S320: the control rod drive mechanism 230 is transferred by the spreader such that the worn thermal sleeve 120 and the worn tube socket 110 are exposed.

After the step S120, the control rod drive mechanism housing is connected to the socket 110.

Specifically, referring to fig. 1 and 2, the housings of the control rod drive mechanisms 230 are connected to the tube sockets 110, and therefore, before removing the worn thermal thimbles 120, it is necessary to separate the control rod drive mechanisms 230 from the tube sockets 110 so that the tube sockets 110 are exposed, thereby facilitating the removal of the worn thermal thimbles 120. And the control rod drive mechanism 230 is connected to the socket 110 after the compensating ring 130 and the new thermal sleeve 120 are installed, ensuring that the reactor is operating properly.

In this embodiment, the case of the crdm 230 is welded to the tube socket 110, and thus the cutting junction is the weld that cuts the case of the crdm 230 and the tube socket 110.

In an embodiment, after step S110, the method for maintaining a reactor further includes: the worn thermal sleeve 120 is transferred to a disposal container for containment.

Specifically, since the thermal sleeve 120 is inside the reactor pressure vessel and is irradiated for a long time, after the worn thermal sleeve 120 is removed, the thermal sleeve 120 needs to be transported to the inside of a disposal vessel for treatment, and the worn thermal sleeve 120 needs to be sealed, so as to prevent radiation attached to the worn thermal sleeve 120 from harming the health of workers.

In an embodiment, before installing a new thermal sleeve 120, the method of maintaining a reactor further comprises: and carrying out nondestructive detection on the new thermal sleeve 120, and installing the new thermal sleeve in the tube seat 110 after the detection result is qualified.

Specifically, in order to ensure that the new thermal sleeve 120 can be used normally, when the new thermal sleeve 120 is installed inside the tube socket 110, the new thermal sleeve 120 is subjected to nondestructive testing in advance, and if the nondestructive testing result of the new thermal sleeve 120 is qualified, the qualified new thermal sleeve 120 is installed inside the tube socket 110, so that the problem of the new thermal sleeve 120 is prevented from affecting the normal operation of the reactor pressure vessel.

Referring to fig. 3, an embodiment of the present application provides a compensating ring 130, and the compensating ring 130 is applied to the reactor maintenance method of any one of the above embodiments, wherein the compensating ring 130 is annular and is installed between the outer contact surface 104 of the thermal sleeve 120 and the seat surface of the tube seat 110.

Specifically, after the seat surface of the tube seat 110 is machined and the machined surface 101 is formed, the lower end surface 103 of the compensating ring 130 is arranged on the machined surface 101, the upper end surface 102 of the compensating ring 130 abuts against the outer contact surface 104 at the upper end of the new heat sleeve 120, so that the worn part of the tube seat 110 is compensated through the compensating ring 130, and after the compensating ring 130 is added, the new heat sleeve 120 can be located at the working position, so that the reactor can work normally.

Referring to fig. 3, in an embodiment, the compensating ring 130 includes a base 131 and a supporting portion 132 connected along the axial direction of the socket 110 and having respective ring shapes, the lower end surface 103 of the base 131 abuts on the machining surface 101, and the upper end surface 102 of the supporting portion 132 abuts on the outer contact surface 104 of the upper end of the new heat pipe 120. The base 131 and the supporting portion 132 may be integrally formed or separately formed, and are fixedly connected together by welding, screw locking, or the like. Specifically, since the lower end surface 103 of the base 131 abuts on the processing surface 101, the upper end surface 102 of the supporting portion 132 abuts on the outer contact surface 104 of the upper end of the thermal sleeve 120, so that the size of the base 131 compensates the wear size of the thermal sleeve 110 along the axial direction of the thermal sleeve 110, and the supporting portion 132 supports the new thermal sleeve 120, the structure is simple, and the manufacturing is convenient.

Referring to fig. 3, in one embodiment, the base 131 of the compensating ring 130 includes a plurality of base portions that are individually preformed and arranged in a sequential manner along the axial direction of the header 110, so that the base portions can be correspondingly fixed on the seat surface of the header 110 or the outer contact surface of the upper end of the new thermal sleeve 120, respectively. Specifically, the base 131 of the compensating ring 130 may be prefabricated into a plurality of annular base portions, and the compensation may be performed using an appropriate number of base portions according to the wear size of the socket 110, so that the base portions may be correspondingly fixed to the seat surface of the socket 110 or the outer contact surface of the upper end of the new heat jacket 120, respectively, thereby increasing the speed of manufacturing the compensating ring 130 by the prefabricated base portions. In using the compensating ring 130, connections such as welded connections may be made between the base portions.

In one embodiment, the compensating ring 130 includes a plurality of portions (not shown) that can be arranged along the circumference of the socket 110 to form the compensating ring 130. When the compensating ring 130 is installed, the portions of the compensating ring 130 can be placed inside the socket 110 and then connected, for example, by welding or screwing. Alternatively, the various portions are sequentially secured to the outer contact surface of the thermal sleeve 120 to form a compensating ring 130 that is fixedly coupled to the thermal sleeve 120.

Referring to fig. 3, in an embodiment, an included angle between the upper end surface 102 of the supporting portion 132 and the central axis of the base 131 is 135 ° ± 2 °, and may be 135 °, and the upper end surface 102 of the supporting portion 132 is high outside and low inside.

In one embodiment, the compensation ring 130 is made of a metal material, such as: iron, stainless steel, etc. have sufficient wear resistance and hardness, but may be made of other materials as long as they can compensate for the worn portion of the socket 110 and support the heat jacket 120.

An embodiment of the present application also provides a reactor including a reactor pressure vessel, a tube block 110, a thermal sleeve 120, and a compensating ring 130 of any of the above embodiments.

In the above-described reactor maintenance method, when the worn thermal sleeve 120 and the worn socket 110 are disposed, the worn thermal sleeve 120 is first removed, the compensating ring 130 is fixed to the seat surface of the socket 110 or to the outer contact surface 104 of the newly provided thermal sleeve 120, the compensating ring 130 is disposed between the seat surface of the socket 110 and the outer contact surface 104 of the upper end of the thermal sleeve 120 to compensate the worn position of the socket 110, and the compensated socket 110 and the compensating ring 130 are used to support the upper end of the new thermal sleeve 120 and are engaged with the new thermal sleeve 120. The method avoids replacing the tube socket 110 and even the entire top cover, is convenient to operate, and the compensation ring 130 compensates for the worn part of the tube socket 110, so that the new thermal sleeve 120 is in its working position, and the reactor pressure vessel can work normally.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A method of maintaining a reactor, the method comprising:

removing the worn heat sleeve in the pipe seat;

providing a compensating ring and a new thermal sleeve, the compensating ring passing through the new thermal sleeve and being arranged between an outer contact surface of an upper end of the new thermal sleeve and a seat surface of the socket to compensate for wear subsidence between the thermal sleeve and the socket.

2. The method for maintaining a reactor according to claim 1, wherein the compensating ring is fixed to a seating surface of the block, and the new thermal sleeve is installed in the block so that an upper end surface of the compensating ring abuts against an outer contact surface of an upper end portion of the thermal sleeve; alternatively, the compensating ring is fixed on the outer contact surface of the upper end of the new thermal sleeve and both are mounted together in the socket.

3. The method of maintaining a reactor according to claim 1, further comprising:

after the step of removing the heat sleeve with the worn inner part of the tube seat, machining a seat surface of the worn tube seat to form a machined surface which is vertical to the axial direction of the tube seat, wherein the lower end surface of the compensation ring is abutted against the machined surface, and the upper end surface of the compensation ring is connected with an outer contact surface of the upper end part of the heat sleeve.

4. The method for maintaining the reactor according to claim 1, wherein the thermal sleeve comprises a thermal sleeve body and a guide cover, the upper end of the thermal sleeve body is the upper end of the thermal sleeve body, and the lower end of the thermal sleeve body extends out of the tube seat and is connected with the guide cover;

the step of removing the worn heat pipe inside the pipe socket comprises the following steps:

and cutting the joint of the guide cover and the hot sleeve body, and taking the hot sleeve body out of the upper end of the tube seat.

5. The method of maintaining a reactor of claim 4, wherein installing the new thermal sleeve comprises:

and providing a new thermal sleeve body, putting the new thermal sleeve body into the tube seat from the upper end of the tube seat, and connecting the lower end of the new thermal sleeve body with the guide cover.

6. A compensating ring for use in the method of maintaining a reactor according to any one of claims 1 to 5, wherein the compensating ring is annular and is mounted between an outer contact surface of the thermal sleeve and a seat surface of the nozzle.

7. The compensating ring as claimed in claim 6, comprising a base and a support connected in the axial direction of the socket and each having a ring shape, the lower end face of the base abutting on the machined surface, and the upper end face of the support abutting on the outer contact surface of the upper end of the heat jacket.

8. The compensating ring of claim 7, wherein the base comprises a plurality of base portions which are individually pre-formed and arranged to be sequentially aligned in an axial direction of the socket so that the base can be correspondingly fixed to a seating surface of the socket or an outer contact surface of an upper end of the new heat jacket, respectively.

9. The compensating ring according to any one of claims 6 to 8, wherein the angle between the upper end surface of the compensating ring and the central axis thereof is 135 ° ± 2 °, and the upper end surface of the compensating ring is high outside and low inside.

10. A reactor comprising a reactor pressure vessel, a tube block, a thermal sleeve and the compensating ring of any one of claims 6 to 9.

Images