A device for verifying the process of heat transfer tube plugging of high temperature gas-cooled reactor steam generator

Abstract

The present invention discloses a verification device for a pipe plugging process of a high-temperature gas-cooled reactor steam generator, comprising a water feed box simulation body for a pipe plugging test, a main steam box simulation body and a water pressure test device for verifying the pipe plugging process; the water feed box simulation body comprises a water feed box tube plate, a water feed box cylinder and a water feed box flange welded in sequence, and a water feed box test piece arranged on the water feed box tube plate; the main steam box simulation body comprises a main steam box tube plate, a main steam box cylinder and a main steam box flange welded in sequence, and a main steam box test piece arranged on the main steam box tube plate; the water pressure test device is composed of a water pressure test cylinder and a water pressure test flange connected to the water feed box test piece or the main steam box test piece after the pipe plugging through bolts; the present invention verifies whether the explored pipe plugging technology meets the operating requirements of the high-temperature gas-cooled reactor steam generator, and explores a pipe plugging technology suitable for the high-temperature gas-cooled reactor steam generator.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear power plant steam generator maintenance, and in particular relates to a heat transfer pipe plugging process verification device for a high-temperature gas-cooled reactor steam generator. Background Art

[0002] The high-temperature gas-cooled reactor is the fourth-generation nuclear power technology. Since its steam generator structure is inconsistent with all previous nuclear power units, the pipe plugging process of other units can be used as a reference but cannot be used directly. Therefore, it is necessary to explore a pipe plugging process suitable for the high-temperature gas-cooled reactor steam generator. Summary of the invention

[0003] In order to verify whether the explored pipe plugging technology is reliable, the purpose of the present invention is to provide a pipe plugging process verification device for a high-temperature gas-cooled reactor steam generator heat transfer pipe, so as to verify whether the explored pipe plugging technology meets the operating requirements of the high-temperature gas-cooled reactor steam generator, and to explore a pipe plugging technology suitable for the high-temperature gas-cooled reactor steam generator.

[0004] In order to achieve the above object, the present invention adopts the following technical solution:

[0005] A device for verifying the blocking process of heat transfer pipes of a high-temperature gas-cooled reactor steam generator comprises a feedwater box simulation body for blocking test, a main steam box simulation body and a water pressure test device for verifying the blocking process; the feedwater box simulation body comprises a feedwater box tube sheet 2, a feedwater box cylinder 3 and a feedwater box flange 4 welded in sequence, a feedwater box test piece 1 arranged on the feedwater box tube sheet 2, the main steam box simulation body comprises a main steam box tube sheet 6, a main steam box cylinder 7 and a main steam box flange 8 welded in sequence, a main steam box test piece 5 arranged on the main steam box tube sheet 6, and the water pressure test device comprises a water pressure test cylinder 9 and a water pressure test flange 10 connected to the blocked feedwater box test piece 1 or the main steam box test piece 5 by bolts;

[0006] The feedwater box simulation body and the main steam box simulation body are respectively consistent with the internal dimensions of the feedwater box and the main steam box of the high-temperature gas-cooled reactor steam generator, simulating the internal working conditions and pipe plugging position of the high-temperature gas-cooled reactor steam generator, simulating the steam generator entity in the simulation body to use the heat transfer pipe of the high-temperature gas-cooled reactor steam generator to be verified to perform the pipe plugging process, and then verifying whether the pipe plugging process is safe and reliable through a water pressure test device;

[0007] The water supply pipe box test piece 1 is welded by a prism and a stainless steel flange, and a plurality of simulated heat transfer pipe blind holes and heat transfer pipe through holes are distributed on the prism; the water supply pipe box tube sheet 2 is provided with a plurality of integrated circular sinking seats and prism through holes, which are respectively connected to the stainless steel flange and prism of the water supply pipe box test piece 1 by bolts;

[0008] The main steam pipe box test piece 5 is welded by a prism and a stainless steel flange, and a plurality of simulated heat transfer tube blind holes and heat transfer tube through holes are distributed on the prism; the outer side of the main steam pipe box tube sheet 6 is provided with a plurality of integrated circular sinking seats and prism through holes, which are respectively connected to the stainless steel flange and prism of the main steam pipe box test piece 5 by bolts;

[0009] The inner sides of the water supply pipe box tube sheet 2 and the main steam pipe box tube sheet 6 are provided with densely distributed simulated heat transfer tube blind holes, providing a simulated evaporator tube sheet environment for the pipe blocking device.

[0010] The blind hole of the water supply pipe box tube plate 2 is threaded.

[0011] The heat transfer pipe blind hole and the heat transfer pipe through hole of the water supply pipe box test piece 1 are threaded, and the heat transfer pipe is made of 2 1 / 4 Cr1Mo,

[0012] The heat transfer pipe material of the main steam pipe box test piece 5 is Incoloy 800H.

[0013] The prism of the water supply pipe box test piece 1 is welded with 2 1 / 4 Cr1Mo.

[0014] The prism of the main steam pipe box test piece 5 is built-up with F91.

[0015] The water pressure test cylinder 9 is formed by welding a stainless steel pipe and flanges at both ends of the stainless steel pipe, and the water pressure test flange 10 is formed by drilling a through hole in the flange, and the through hole is used to connect a pressure device.

[0016] The present invention has the following effects:

[0017] In the present invention, each test piece can test multiple heat transfer tubes at a time, and the remaining devices are all reusable devices. Only the test piece needs to be replaced each time a test is performed. Each simulation body can be equipped with multiple test pieces at a time, and multiple heat transfer tubes can be tested at a time.

[0018] The present invention uses a 1:1 simulation body to simulate the feed water pipe box and the main steam pipe box of the high temperature gas-cooled reactor steam generator, verifies the heat transfer pipe plugging technology of the high temperature gas-cooled reactor steam generator, and avoids nuclear safety accidents caused by pipe plugging using immature technology.

[0019] In the present invention, only specific materials need to be used for the test piece and the heat transfer tube, thus saving the cost of the verification device.

[0020] The water pressure test device in the present invention is composed of a pipe and a flange that meet the high pressure requirements, and there is no need to make a self-made water pressure test device. The invention is convenient, simple, safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the water supply pipe box simulation body.

[0022] Figure 1a This is a schematic diagram of the water supply pipe box test piece 1. Figure 1b This is the schematic diagram of the water supply pipe box tube sheet. Figure 1c It is a partial schematic diagram of the water supply pipe box test piece and the water supply pipe box tube sheet being combined into a complete water supply pipe box tube sheet.

[0023] Figure 2 This is a schematic diagram of the structure of the main steam pipe box simulation body;

[0024] Figure 3 It is a structural schematic diagram of the water pressure test device.

[0025] Among them, 1 is the water supply pipe box test piece, 2 is the water supply pipe box tube plate, 3 is the water supply pipe box cylinder, 4 is the water supply pipe box flange, 5 is the main steam pipe box test piece, 6 is the main steam pipe box tube plate, 7 is the main steam pipe box cylinder, 8 is the main steam pipe box flange, 9 is the water pressure test cylinder, and 10 is the water pressure test flange. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0027] In order to verify whether the explored plugging process is reliable, a device for verifying the plugging process of heat transfer tubes of high temperature gas-cooled reactor steam generator is specially developed and designed. Due to the design structure of the high temperature gas-cooled reactor, the two ends of the heat transfer tube are located in the feed water box and the main steam box respectively, and the structures of the feed water box and the main steam box are slightly different, so the process device includes a feed water box simulation body, a main steam box simulation body and a water pressure test device. Among them, the feed water box simulation body and the main steam box simulation body simulate the internal environment of the feed water box and the main steam box of the high temperature gas-cooled reactor respectively, providing the plugging device with a plugging environment consistent with the evaporator entity, and the water pressure test device is used to verify whether the plugging result is safe and reliable, so as to verify whether the plugging process meets the operating requirements of the high temperature gas-cooled reactor steam generator, and explore a plugging process suitable for the high temperature gas-cooled reactor steam generator.

[0028] refer to Figure 1 , Figure 1a , Figure 1b and Figure 1cThe water supply box simulation body includes a water supply box tube sheet 2, a water supply box barrel 3 and a water supply box flange 4 which are welded in sequence. The water supply box test piece 1 is arranged on the water supply box tube sheet 2. The water supply box test piece 1 is welded by a prism and a stainless steel flange. 21 / 4Cr1Mo is welded on the prism. There are multiple heat transfer tube hole through holes or blind holes distributed on the prism. There is at least one through hole. The through hole is a hole for verifying the pipe plugging process. The blind hole is a hole for simulating the tube sheet environment. Heat transfer tube holes are distributed on one side of the water supply box tube sheet 2, and there are multiple prism through holes, circular sink seats and bolt holes on the other side. The water supply box test piece 1 can be connected to the water supply box tube sheet 2 by bolts to form a complete water supply box tube sheet. The complete water supply box tube sheet is welded with the water supply box barrel 3 and the water supply box flange 4 to form a high temperature gas-cooled reactor steam generator water supply box simulation body.

[0029] refer to Figure 2 The main steam box test piece 5, the main steam box tube sheet 6, the main steam box cylinder 7 and the main steam box flange can form a main steam box simulation body of a high-temperature gas-cooled reactor steam generator. The main steam box test piece 5 is welded by a prism and a stainless steel flange. F91 is welded on the prism, and a plurality of simulated heat transfer tube blind holes and heat transfer tube through holes are distributed on the prism; the outer side of the main steam box tube sheet 6 is provided with a plurality of integrated circular sink seats and prism through holes, which are respectively connected to the stainless steel flange and prism of the main steam box test piece 5 by bolts.

[0030] The specified heat transfer tubes of the feedwater box test piece 1 and the main steam box test piece 5 are blocked by the plugging process to be verified on the feedwater box simulation body and the main steam box simulation body. After the plugging is completed, the feedwater box test piece 1 and the main steam box test piece 5 are disassembled and connected to the water pressure test cylinder 9 and the water pressure test tube plate 10 for reference. Figure 3 , forming a water pressure test device. The pressure device is connected to the water pressure test tube plate 10 to perform a water pressure test to verify whether the pipe plugging process meets the high-pressure operating environment. After the water pressure test, the material analysis of the pipe plugging part can be carried out to study the advantages and disadvantages of the pipe plugging technology, and finally explore and verify the pipe plugging process suitable for the heat transfer pipe of the high-temperature gas-cooled reactor steam generator.

Claims

1. A device for verifying the heat transfer pipe blocking process of a high temperature gas-cooled reactor steam generator, characterized in that: It comprises a water supply box simulation body for pipe plugging test, a main steam box simulation body and a water pressure test device for verifying the pipe plugging process; the water supply box simulation body comprises a water supply box tube sheet (2), a water supply box cylinder (3) and a water supply box flange (4) welded in sequence, a water supply box test piece (1) arranged on the water supply box tube sheet (2); the main steam box simulation body comprises a main steam box tube sheet (6), a main steam box cylinder (7) and a main steam box flange (8) welded in sequence, a main steam box test piece (5) arranged on the main steam box tube sheet (6); the water pressure test device comprises a water pressure test cylinder (9) and a water pressure test flange (10) connected to the water supply box test piece (1) or the main steam box test piece (5) after pipe plugging by bolts; The feedwater box simulation body and the main steam box simulation body are respectively consistent with the internal dimensions of the feedwater box and the main steam box of the high-temperature gas-cooled reactor steam generator, simulating the internal working conditions and pipe plugging position of the high-temperature gas-cooled reactor steam generator, simulating the steam generator entity in the simulation body to use the heat transfer pipe of the high-temperature gas-cooled reactor steam generator to be verified to perform the pipe plugging process, and then verifying whether the pipe plugging process is safe and reliable through a water pressure test device; The water supply pipe box test piece (1) is welded by a prism and a stainless steel flange, and a plurality of simulated heat transfer pipe blind holes and heat transfer pipe through holes are distributed on the prism; the water supply pipe box tube sheet (2) is provided with a plurality of integrated circular sinking seats and prism through holes, which are respectively connected to the stainless steel flange and prism of the water supply pipe box test piece (1) by bolts; The main steam pipe box test piece (5) is welded by a prism and a stainless steel flange, and a plurality of simulated heat transfer tube blind holes and heat transfer tube through holes are distributed on the prism; a plurality of integrated circular sinks and prism through holes are arranged on the outer side of the main steam pipe box tube sheet (6), which are respectively connected to the stainless steel flange and prism of the main steam pipe box test piece (5) by bolts; The inner sides of the water supply pipe box tube sheet (2) and the main steam pipe box tube sheet (6) are provided with densely distributed simulated heat transfer tube blind holes, so as to provide a simulated evaporator tube sheet environment for the tube blocking device; The blind hole of the water supply pipe box tube plate (2) is threaded; The blind holes and through holes of the heat transfer pipes on the water supply pipe box test piece (1) are threaded, and the heat transfer pipes are made of 2 1 / 4Cr1Mo.

2. The high temperature gas-cooled reactor steam generator heat transfer pipe plugging process verification device according to claim 1, characterized in that: The heat transfer pipes on the main steam pipe box test piece (5) are made of Incoloy 800H.

3. The high temperature gas-cooled reactor steam generator heat transfer pipe blocking process verification device according to claim 1, characterized in that: The prism of the water supply pipe box test piece (1) is welded with 2 1 / 4Cr1Mo.

4. The high temperature gas-cooled reactor steam generator heat transfer pipe plugging process verification device according to claim 1, characterized in that: The prism of the main steam pipe box test piece (5) is built-up with F91.

5. The device for verifying the heat transfer pipe plugging process of a high temperature gas-cooled reactor steam generator according to claim 1, characterized in that: The water pressure test cylinder (9) is made by welding a stainless steel pipe and flanges at both ends of the stainless steel pipe, and the water pressure test flange (10) is made by drilling a through hole in the flange, and the through hole is used to connect a pressure device.

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