Steam exhaust pipe capable of being tested for air tightness and test method

Abstract

The present application relates to the technical field of condenser pipeline, in particular to a kind of exhaust pipe and test method of field air tightness / air pressure test, exhaust pipe includes main pipeline, the main pipeline includes steam inlet end and steam outlet end;Curved pipe balance compensator at least includes first port and second port in communication;First port is connected with the steam inlet end of main pipeline;Butt pipe, including first pipeline and second pipeline;The second end of first pipeline and the second end of second pipeline are coaxially and detachably connected along first axis direction;Gasket is detachably arranged between the second end of first pipeline and the second end of second pipeline, and the thickness of the gasket is greater than or equal to the thickness of the blind plate subsequently used to block the second end of first pipeline.The exhaust pipe provided by the present application can be tested on site, and the test can be repeated multiple times without the need for cutting and blocking, welding of multiple pipes, simplifying the operation difficulty.

Description

Technical Field

[0001] The present invention relates to the technical field of condenser pipes, and in particular to an exhaust pipe capable of on-site airtightness / air pressure testing and a testing method. Background Art

[0002] The exhaust pipe is a pipe connecting the direct air-cooled condenser and the turbine exhaust port. Its main function is to transport the exhaust steam of the turbine to the air-cooled condenser for condensation. The pipe diameter is generally above DN1000, and the length varies between 10m and 30m. It is equipped with elbows, tees, expansion joints, supports and hangers and other pipe accessories in the middle.

[0003] Currently, the design pressure of this pipeline is generally 0.1 MPa(g). The pipeline is welded and assembled on-site, and a 20% non-destructive test is performed on the longitudinal circumferential welds after welding. After welding, the entire system and the air cooler are tested for leaks. The absence of leaks confirms that the pipeline installation has passed acceptance. However, due to market demand, especially in Europe and Russia, the design pressure of the entire direct air-cooled condensing system has been gradually raised to 0.35 MPa(g). The exhaust pipe design has entered the category of pressure pipe. After on-site assembly, not only is an air-tightness test required, but also an on-site air pressure test.

[0004] The current exhaust pipe layout is such that one end is connected to the air-cooled condenser inlet and the other end is connected to the turbine exhaust port. Whether conducting an on-site pressure test or air tightness test, the exhaust pipe must be temporarily cut off and then sealed at the turbine exhaust port. Due to structural reasons, the turbine exhaust port is often difficult to seal. Therefore, the only way to conduct an air tightness test or pressure test is to cut off a certain point in the middle of the pipe and then weld a temporary blind plate. However, this method has the following disadvantages:

[0005] (1) The blind plate is removed by cutting and welding the pipeline on site, which makes the construction difficult and causes additional costs.

[0006] (2) The section of pipeline from the cut-off point to the exhaust port could never be included in the test.

[0007] (3) Temporary shutoff can only be a one-time test. After the unit is overhauled and restarted, it needs to be shut off again for the second air tightness or air pressure test.

[0008] Considering the above points, on-site air tightness and pressure testing of exhaust piping is currently difficult to perform, leading to the majority of projects forgoing on-site testing. This can result in leaks or welding issues going undetected, leading to vacuum leaks during unit operation and impacting normal operation. However, as market demands grow, on-site air tightness and pressure testing are becoming increasingly important, gradually becoming mandatory. Consequently, exhaust piping design, improvement, and innovation are becoming even more crucial. Summary of the Invention

[0009] In order to solve at least one of the technical problems mentioned in the background technology, the purpose of the present invention is to provide an exhaust pipe and a test method that can be used for on-site air tightness / air pressure testing.

[0010] To achieve the above object, the present invention provides the following technical solutions:

[0011] In one aspect, the present invention provides an exhaust pipe capable of on-site air tightness / air pressure testing, comprising:

[0012] A main pipeline, the main pipeline includes a steam inlet end and a steam outlet end, the steam inlet end is used to connect to the exhaust port of the steam turbine; the steam outlet end is used to connect to the inlet of the condenser;

[0013] The curved pipe balancing compensator comprises at least a first port and a second port which are in communication with each other; the first port is connected to the steam inlet end of the main pipeline;

[0014] The docking pipeline includes a first pipeline and a second pipeline, wherein the first end of the first pipeline is connected to the second port of the curved pipe balancing compensator; the first end of the second pipeline is connected to the exhaust port of the steam turbine; the second end of the first pipeline is coaxially and detachably connected to the second end of the second pipeline along the first axis direction;

[0015] A gasket is detachably arranged between the second end of the first pipe and the second end of the second pipe, and the thickness of the gasket is greater than or equal to the thickness of a blind plate subsequently used to seal the second end of the first pipe.

[0016] As an optional embodiment of the present invention, the second end of the first pipeline and the second end of the second pipeline are connected via a flange assembly.

[0017] As an optional embodiment of the present invention, the flange assembly includes a first flange and a second flange that can be coaxially connected through a bolt assembly; the first flange is fixed to the second end of the first pipe, and the second flange is fixed to the second end of the second pipe.

[0018] As an optional embodiment of the present invention, a sealing gasket is provided between the first flange and the gasket, and / or a sealing gasket is provided between the second flange and the gasket.

[0019] As an optional embodiment of the present invention, one or more lifting ears are provided on the circumference of the gasket.

[0020] As an optional embodiment of the present invention, the first axis is vertical, and the first pipe is located below the second pipe.

[0021] As an optional embodiment of the present invention, the exhaust pipe further includes an elastic support member, which is provided below the curved pipe balancing compensator and is used to vertically support the curved pipe balancing compensator.

[0022] As an optional embodiment of the present invention, the elastic support member includes a spring bracket.

[0023] On the other hand, the present invention also provides a test method for an exhaust pipe capable of on-site airtightness / air pressure testing, comprising the following steps:

[0024] S1. Disconnect the second end of the first pipe from the second end of the second pipe, so that the second end of the first pipe is disconnected from the second end of the second pipe.

[0025] S2, applying force to drive the second end of the first pipe to move a distance away from the second end of the second pipe along the first axis, so that the second end of the first pipe and the second end of the second pipe release the clamping of the gasket;

[0026] S3, apply force to pull out the gasket;

[0027] S4. Providing a blind plate that can be detachably connected to the second end of the first pipe, inserting the blind plate between the second end of the first pipe and the second end of the second pipe, and connecting the blind plate to the second end of the first pipe to seal the second end of the first pipe;

[0028] S5. Introduce test gas into the exhaust pipe to perform an airtightness / air pressure test.

[0029] As an optional embodiment of the present invention, the above test method further includes the following steps:

[0030] S6. After the test in step S5 is completed, the blind plate is removed; the gasket is re-installed between the second end of the first pipe and the second end of the second pipe, and the second end of the first pipe and the second end of the second pipe are reconnected and fixed.

[0031] Compared with the existing technology, the advantages of adopting this solution are:

[0032] In this solution, a curved pipe balancing compensator, a first pipe and a second pipe are provided to connect the main pipe and the inlet of the condenser, and the second end of the first pipe and the second end of the second pipe are connected along a detachable ground, and a gasket is provided at the same time;

[0033] In this way, when an air tightness / air pressure test is required, the connection between the second end of the first pipe and the second end of the second pipe can be disassembled and released, and then the gasket can be pulled out, and the blind plate used to seal the second end of the first pipe can be connected to the second end of the first pipe to seal the second end of the first pipe and subsequent test operations can be carried out.

[0034] It can be seen that the exhaust pipe provided by the present invention can be used for on-site air tightness / air pressure test conditions; and there is no need to perform partial cutting, welding blind plates, etc. on the entire exhaust pipe for the test, which simplifies the operation difficulty; and the test can be repeated many times.

[0035] It is worth noting that the main function of the gasket is to fill the space between the second ends of the first pipe and the second pipe, so that after the subsequent gasket is removed, there is enough space between the second ends of the first pipe and the second pipe for the blind plate to be installed.

[0036] The reason why the curved pipe balance compensator is set up is:

[0037] First, it can absorb the thermal displacement generated by the main pipeline during the operation of the entire turbine-condenser system.

[0038] Secondly, since the gasket is clamped between the second ends of the first pipe and the second pipe, the second ends of the first pipe and the second pipe will exert a large clamping force on the gasket, so it is very difficult to pull the gasket out from between the second ends of the two pipes later. Therefore, a curved pipe balancing compensator is provided because the curved pipe balancing compensator itself has a certain degree of freedom of movement. For example, in the present invention, it has a certain degree of freedom of movement at least in the first axial direction (i.e., vertically), that is, it can move vertically for a certain distance. In this way, after the connection between the second ends of the first pipe and the second pipe is released, force can be applied to drive the first pipe downward for a certain distance, thereby making the first pipe and the second pipe relatively distant from each other to loosen the clamping of the gasket. Without the clamping force of the two pipes, the gasket can be more easily pulled out.

[0039] Moreover, in this solution, the blind plate is sealed at the second end of the first pipe, which is relatively close to the exhaust port of the steam turbine, so that as many pipes as possible of the entire exhaust pipe can participate in the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a structural schematic diagram of the present invention;

[0041] Figure 2 It is a schematic diagram of the partial structure of the butt-jointed pipeline of the present invention;

[0042] Figure 3 Schematic diagram of the structure of the gasket of the present invention;

[0043] Figure 4 Schematic diagram of the structure of the curved pipe balancing compensator of the present invention;

[0044] Figure 5 This is a schematic structural view of the curved pipe balancing compensator of the present invention. DETAILED DESCRIPTION

[0045] The following is an explanation and description of the technical solutions of the embodiments of the present invention in conjunction with the drawings of the embodiments of the present invention. However, the following embodiments are only preferred embodiments of the present invention and are not exhaustive. Based on the embodiments in the implementation manner, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0046] In the following description, terms such as "inside", "outside", "up", "down", "left", "right", etc. that indicate directions or positional relationships are only used to facilitate the description of the embodiments and simplify the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0047] Example 1

[0048] See also Figures 1-5 As shown, this embodiment provides an exhaust pipe that can be subjected to on-site air tightness / air pressure tests, that is, the exhaust pipe provided by this embodiment can be suitable for both air tightness tests and air pressure tests; in particular, it can be used for on-site air tightness or air pressure tests of the exhaust pipe.

[0049] Among them, the exhaust pipe, sometimes also called the large exhaust pipe, is a pipe connecting the direct air-cooled condenser (hereinafter referred to as the condenser) and the exhaust port of the steam turbine. Its main function is to transport the exhaust steam of the steam turbine to the air-cooled condenser for condensation. The pipe diameter is generally above DN1000, and the length varies between 10m and 30m. It is equipped with elbows, tees, expansion joints, supports and hangers and other pipe accessories in the middle.

[0050] The air tightness test of the exhaust pipe is mainly used to test the air tightness of the exhaust pipe; while the air pressure test is mainly used to test the compressive strength of the exhaust pipe.

[0051] In addition, it is worth mentioning that the field test mentioned above refers to the test carried out under the working condition that the turbine, condenser and exhaust pipe have been assembled. For example, after the entire system has been running for a period of time, the exhaust pipe in the system is subjected to an air tightness or air pressure test. This is different from the test before the exhaust pipe is assembled.

[0052] like Figure 1 As shown, the exhaust pipe provided in this embodiment mainly includes a main pipe 1, a curved pipe balancing compensator 2, a docking pipe 3, a gasket 4, an elastic support member, etc. The following is a detailed description of each component:

[0053] like Figure 1As shown, the main pipeline 1 includes a steam inlet 1a and a steam outlet 1b. The steam inlet 1a is connected to the steam turbine exhaust; the steam outlet 1b is connected to the condenser inlet. During operation, steam discharged from the steam turbine exhaust enters the main pipeline 1 through the steam inlet 1a and then enters the condenser through the steam outlet 1b through the condenser inlet.

[0054] It is worth noting that the steam outlet end 1b of the main pipeline 1 can be one or more to correspond to multiple condensers; for example, in this embodiment Figure 1 What is shown in the figure is that the main pipeline 1 has a steam inlet end 1a and four steam outlet ends 1b. Specifically, it mainly includes a main pipe 11 and four branch pipes 12 connected to the main pipe 11. The end of the main pipe 11 away from the branch pipe 12 constitutes the steam inlet end 1a of the main pipeline 1, and the end of the branch pipe 12 away from the main pipe 11 constitutes the steam outlet end 1b of the main pipeline 1. In this way, the four branch pipes 12 form four steam outlet ends 1b.

[0055] It can be understood that in some embodiments, each steam outlet end 1b or branch pipe 12 is provided with a valve to control the on / off of the steam outlet end 1b.

[0056] Combine Figure 1 and Figure 4 As shown, the curved pipe balancing compensator 2 includes at least a first port 2a and a second port 2b that are connected to each other; the curved pipe balancing compensator 2 is similar to a multi-way pipe with multiple ports. Unlike traditional hard pipes, it has a certain degree of freedom of movement, or deformation ability. Generally speaking, the distance that the curved pipe balancing compensator 2 can move is about 50 mm.

[0057] The curved pipe balance compensator 2 is widely used in some condenser-turbine systems, mainly to absorb the thermal displacement generated by the operation of the system pipeline.

[0058] In some embodiments, the curved pipe balance compensator 2 adopts a three-way structure, such as Figure 1 As shown, it mainly includes three interconnected ports, two of which are located on opposite sides, and the other port is located in the middle of the curved pipe balance compensator 2 and faces upward; applied to this embodiment, among the three ports, one of the two ports on the opposite sides is used as the first port 2a, and the other is blocked by a sealing plate; and the middle port is used as the second port 2b.

[0059] Among them, such as Figure 4 As shown, the first port 2a of the curved pipe balancing compensator 2 is connected to the steam inlet end 1a of the main pipeline 1;

[0060] The docking pipe 3 is mainly used to connect the exhaust port of the steam turbine and the second port 2b of the curved pipe balancing compensator 2.

[0061] Combine Figure 1 and Figure 2 In other words, the docking pipe 3 includes a first pipe 31 and a second pipe 32; the first end of the first pipe 31 is connected to the second port 2b of the curved pipe balancing compensator 2, and the two are coaxially arranged and connected.

[0062] by Figure 1 Taking the shown viewing direction as an example, the first end of the first pipe 31 can be considered as the lower end of the first pipe 31; the second end of the first pipe 31 can be considered as the upper end of the first pipe 31; the first end of the second pipe 32 can be considered as the upper end of the second pipe 32, and the second end of the second pipe 32 can be considered as the lower end of the second pipe 32.

[0063] by Figure 2 Taking the viewing direction as an example, the second end of the first pipe 31 is shown as 31a in the figure, and the second end of the second pipe is shown as 32a in the figure.

[0064] The first end of the second pipe 32 is connected to the exhaust port of the steam turbine; the second end of the first pipe 31 and the second end of the second pipe 32 are coaxially and detachably connected along the first axis direction; in some embodiments, such as Figure 1 and Figure 2 As shown, the first pipe 31 and the second pipe 32 are both straight pipe structures, and the two are coaxially arranged along the first axis direction. Figure 1 As shown, the manifold 11 extends transversely, and the curved pipe balancing compensator 2 is coaxially connected to the manifold 11 transversely. The second port 2b of the curved pipe balancing compensator 2 is vertically disposed. In this case, the first axis direction can also be understood as the vertical direction, or the axis direction of the second port 2b. Furthermore, the first pipe 31 is located below the second pipe 32.

[0065] In addition, due to the presence of the curved pipe balancing compensator 2, when the first pipe 31 and the second pipe 32 are disassembled from each other, the second end of the first pipe 31 and the second end of the second pipe 32 can move relative to each other along the first axis direction (ie vertically) for a distance.

[0066] For example, the second pipe 32 is connected to the exhaust port of the steam turbine and remains stationary; and after the second end of the first pipe 31 is separated from the second end of the second pipe 32, the second end of the first pipe 31 can move downward a distance relative to the second end of the second pipe 32, so that the second ends of the first pipe 31 and the second pipe 32 release the clamping of the gasket 4, thereby facilitating the subsequent removal of the gasket 4 and the installation of the blind plate.

[0067] It is worth noting that when conducting an air tightness / air pressure test on the exhaust pipe, it is necessary to introduce test gas into the exhaust pipe to form a certain air pressure in the exhaust pipe. Therefore, both sides of the exhaust pipe need to be sealed before the test. The side of the exhaust pipe close to the condenser inlet can be directly sealed by closing the valve on the branch pipe 12; and the exhaust port close to the turbine side can be sealed by a blind plate. At this time, the section of the exhaust pipe between the valve and the blind plate is the section participating in the test.

[0068] In this embodiment, a blind plate (not shown in the figure) is detachably connected to the second end of the first pipe 31 to seal the second end of the first pipe 31. That is, after the gasket 4 is removed, the blind plate is inserted between the second ends of the first pipe 31 and the second pipe 32 and connected to the second end of the first pipe 31 to seal the second end of the first pipe 31.

[0069] Among them, the main function of the gasket 4 is to fill the space between the second ends of the first pipe 31 and the second pipe 32, so that after the subsequent gasket 4 is removed, there is enough space between the second end of the first pipe 31 and the second end of the second pipe 32 for the blind plate to be installed. Therefore, in this embodiment, the thickness of the gasket 4 needs to be greater than or equal to the thickness of the blind plate.

[0070] In other words, assuming that the gasket 4 is not provided and the second ends of the first pipe 31 and the second pipe 32 are directly connected, then when a blind plate is needed for subsequent sealing, even if the first pipe 31 is moved downward a certain distance in conjunction with the curved pipe balancing compensator 2, the distance between the second ends of the first pipe 31 and the second pipe 32 is not sufficient for the blind plate to be installed. This is mainly because the blind plate thickness generally used is more than 50 mm, and the floating distance of the curved pipe balancing compensator 2 is generally about 50 mm. That is, the first pipe 31 can only be lowered by about 50 mm at most. Therefore, the maximum distance between the second ends of the first pipe 31 and the second pipe 32 is also 50 mm. Obviously, it is difficult to insert a blind plate with a thickness of more than 50 mm.

[0071] Therefore, in this embodiment, a gasket 4 is provided to fill the space between the second ends of the first pipe 31 and the second pipe 32, so that there is a sufficient initial spacing between the second ends of the first pipe 31 and the second pipe 32, and the initial spacing is the thickness of the gasket 4; therefore, after the gasket 4 is subsequently pulled out, the spacing between the second ends of the first pipe 31 and the second pipe 32 is sufficient for the blind plate to be inserted.

[0072] It can be seen that the curved pipe balancing compensator 2 is provided in this embodiment, and its significance is:

[0073] First, it can absorb the thermal displacement generated by the main pipeline 1 and the like during the operation of the entire turbine-condenser system.

[0074] Secondly, since the gasket 4 is clamped between the second ends of the first pipe 31 and the second pipe 32, the second ends of the first pipe 31 and the second pipe 32 will produce a large clamping force on the gasket 4, so it is very difficult to pull out the gasket 4 from between the second ends of the two pipes later; therefore, a curved pipe balancing compensator 2 is provided, because the curved pipe balancing compensator 2 itself has a certain degree of freedom of movement. For example, in the present invention, it has a certain degree of freedom of movement at least in the vertical direction, that is, it can move vertically for a certain distance. In this way, after the connection between the second ends of the first pipe 31 and the second pipe 32 is released, force can be applied to drive the first pipe 31 downward for a certain distance, so that the first pipe 31 and the second pipe 32 are relatively far away from each other to loosen the clamping of the gasket 4. Without the clamping force of the two pipes, the gasket 4 can be easily pulled out.

[0075] In addition, in this embodiment, the blind plate blocking position is at the second end of the first pipe 31, which is relatively close to the exhaust port of the steam turbine. In this way, as much of the exhaust pipe as possible can be involved in the test; that is, the shorter the second pipe 32, the closer the blocking point of the exhaust pipe (i.e., the blind plate blocking position) is to the exhaust port of the steam turbine, and thus the longer the exhaust pipe travel is involved in the test.

[0076] In some embodiments, when performing blind plate sealing, the blind plate is also connected to the second end of the first pipe 31 in a detachable manner.

[0077] In some embodiments, the second end of the first pipe 31 and the second end of the second pipe 32 can be detachably connected to each other via a flange assembly 5 . Specifically:

[0078] like Figure 2 As shown, the flange assembly 5 includes a first flange 51 and a second flange 52 that can be coaxially connected through a bolt assembly (not shown in the figure); the first flange 51 is fixed to the second end of the first pipe 31, and the second flange 52 is fixed to the second end of the second pipe 32.

[0079] In some embodiments, the bolt assembly includes a bolt and a nut adapted for the bolt; when connecting, the first flange 51 and the second flange 52 are aligned with each other, and then the bolts are passed through the flange holes on the two flanges in turn and the nuts are screwed on to achieve flange connection.

[0080] Of course, in some other optional embodiments, the bolt assembly may only include bolts. Among the two flanges, the flange hole on one flange is designed to be a threaded hole compatible with the bolt, and the flange hole on the other flange is a through hole. In this way, after the two flanges are aligned, the bolt passes through the screw hole and is threadedly connected to the threaded hole to lock the two flanges. This method can also achieve the connection of the two flanges.

[0081] When the first pipe 31 and the second pipe 32 need to be disassembled, the bolt assembly is removed to release the connection between the two first flanges 51 and the second flange 52. At this time, force can be applied to drive the second ends of the first pipe 31 and the second pipe 32 away from each other to loosen the clamping of the gasket 4.

[0082] In some embodiments, the connection between the blind plate and the first pipe 31 may also adopt a structure similar to a flange connection, that is, a flange hole is also opened on the blind plate at the flange hole position corresponding to the first flange 51. In this way, the blind plate and the first flange 51 can also be connected in a manner similar to a flange connection using a bolt assembly to seal the second end of the first pipe 31.

[0083] In order to facilitate the subsequent extraction of the gasket 4 from between the first flange 51 and the second flange 52, one or more lifting ears 41 are provided on the periphery of the gasket 4. The lifting ears 41 serve as the fulcrum for the subsequent extraction of the flange. The lifting ears 41 are connected by mechanical equipment to pull out the gasket 4.

[0084] In order to improve the sealing between the flange and the gasket 4 , a sealing gasket 53 is provided between the first flange 51 and the gasket 4 , and / or a sealing gasket 53 is provided between the second flange 52 and the gasket 4 .

[0085] In addition, the gasket 4 can be connected to the first flange 51 by the aforementioned bolt assembly connection method, that is, holes for bolt assembly connection are also provided at the flange hole positions of the gasket 4 corresponding to the first flange 51 .

[0086] In order to support the curved pipe balancing compensator 2, in this embodiment, the exhaust pipe also includes an elastic support member, which is arranged below the curved pipe balancing compensator 2 to vertically support the curved pipe balancing compensator 2; during specific installation, elastic support members are arranged on both sides of the bottom of the curved pipe balancing compensator 2.

[0087] The elastic support member can be an existing spring bracket 6, which primarily comprises a base and a shaft capable of vertically extending relative to the base. A spring is disposed between the base and the shaft, providing an elastic force that causes the shaft to tend to rise upward. This type of spring bracket 6 has been extensively described and applied in the prior art, and will not be elaborated upon here. Furthermore, some existing spring brackets 6 typically include a locking member, such as a screw, that can lock the shaft at any extended height, thereby maintaining relative fixation between the shaft and the base.

[0088] The advantage of using this lockable spring bracket 6 is that after the first pipe 31 and the second pipe 32 are separated, the first pipe 31 will overcome the elastic force of the spring bracket 6 and squeeze the shaft downward during the downward movement. When the shaft moves down to the set position, the locking piece is used to lock the shaft. At this time, the shaft will not be lifted upward under the action of the spring, ensuring that a gap is maintained between the second ends of the first pipe 31 and the second pipe 32.

[0089] Example 2

[0090] This embodiment provides a test method for an exhaust pipe capable of on-site airtightness / air pressure testing based on the first embodiment. The specific structure of the exhaust pipe is described in detail in the first embodiment, so it will not be described in detail here. This test method mainly includes the following steps:

[0091] S1. Disassemble the second end of the first pipe 31 and the second end of the second pipe 32 so that the second end of the first pipe 31 and the second end of the second pipe 32 are disconnected.

[0092] Taking the second end of the first pipe 31 and the second end of the second pipe 32 as an example, when disassembling, the connection can be released by removing the bolt assembly.

[0093] S2. Apply force to drive the second end of the first pipe 31 to move a distance away from the second end of the second pipe 32 along the first axis direction, so that the second ends of the first pipe 31 and the second ends of the second pipe 32 release the clamping of the gasket 4.

[0094] For example, mechanical equipment (such as hydraulic equipment) is used to press down the spring support 6 and / or the curved pipe balancing compensator 2 and / or the first pipe 31, thereby moving the first pipe 31 downward a certain distance, so that the second end of the first pipe 31 and the second end of the second pipe 32 release the gasket 4. Then, the spring support 6 is locked.

[0095] S3. Apply force to pull out the gasket. The gasket can be pulled out with the help of mechanical equipment and the lifting lugs on the gasket.

[0096] S4. Provide a blind plate that can be removably connected to the second end of the first pipe 31. Insert the blind plate into the space and connect it to the second end of the first pipe 31 to block the second end of the first pipe 31. The blind plate is also connected to the second end of the first pipe 31 using a bolt assembly. Close the valve on the exhaust pipe near the condenser inlet. This creates a closed section of the exhaust pipe between the blind plate and the valve for subsequent testing.

[0097] S5. Introduce test gas into the exhaust pipe to perform an airtightness / air pressure test.

[0098] The method of introducing the test gas can be to reserve a reserved port on the exhaust pipe for the test gas to enter; or to use some ports on the exhaust pipe (such as the drain port of the exhaust pipe) as a channel for gas to enter; in this way, the gas is filled into the exhaust pipe.

[0099] When conducting an airtight test, the main purpose is to detect whether there is any leakage in the exhaust pipe.

[0100] When conducting an air pressure test, the main purpose is to test the pressure resistance of the exhaust pipe.

[0101] There are many implementation methods in the prior art for performing air pressure or airtightness tests on pipelines using gas, which are not specifically limited here.

[0102] Finally, after the test is completed in step S5, the blind plate is removed; the gasket 4 is re-installed between the second end of the first pipe 31 and the second end of the second pipe 32, and the second end of the first pipe 31 and the second end of the second pipe 32 are reconnected and fixed.

[0103] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

Claims

1. The exhaust pipe can be tested for air tightness / air pressure on site, characterized by: include: A main pipeline, the main pipeline includes a steam inlet end and a steam outlet end, the steam inlet end is used to connect to the exhaust port of the steam turbine; the steam outlet end is used to connect to the inlet of the condenser; The curved pipe balancing compensator comprises at least a first port and a second port which are in communication with each other; the first port is connected to the steam inlet end of the main pipeline; The docking pipeline includes a first pipeline and a second pipeline, wherein the first end of the first pipeline is connected to the second port of the curved pipe balancing compensator; the first end of the second pipeline is connected to the exhaust port of the steam turbine; the second end of the first pipeline is coaxially and detachably connected to the second end of the second pipeline along the first axis direction; A gasket is detachably arranged between the second end of the first pipe and the second end of the second pipe, and the thickness of the gasket is greater than or equal to the thickness of a blind plate subsequently used to seal the second end of the first pipe.

2. The exhaust pipe capable of on-site airtightness / air pressure testing according to claim 1 is characterized in that: The second end of the first pipeline and the second end of the second pipeline are connected through a flange assembly.

3. The exhaust pipe capable of on-site airtightness / air pressure testing according to claim 2 is characterized in that: The flange assembly includes a first flange and a second flange that can be coaxially butted together through a bolt assembly; the first flange is fixed to the second end of the first pipe, and the second flange is fixed to the second end of the second pipe.

4. The exhaust pipe capable of on-site airtightness / air pressure testing according to claim 3 is characterized in that: A sealing gasket is provided between the first flange and the gasket, and / or a sealing gasket is provided between the second flange and the gasket.

5. The exhaust pipe capable of on-site airtightness / air pressure testing according to claim 1 is characterized in that: One or more lifting ears are provided on the circumference of the gasket.

6. The exhaust pipe capable of on-site airtightness / air pressure testing according to claim 1 is characterized in that: The first axis is in a vertical direction, and the first pipe is located below the second pipe.

7. The exhaust pipe capable of on-site airtightness / air pressure testing according to claim 1 is characterized in that: The exhaust pipe further includes an elastic support member, which is arranged below the curved pipe balancing compensator and is used to vertically support the curved pipe balancing compensator.

8. The exhaust pipe capable of on-site airtightness / air pressure testing according to claim 7, characterized in that: The elastic support member includes a spring bracket.

9. The test method for exhaust pipes capable of on-site airtightness / air pressure testing according to any one of claims 1 to 8, characterized in that: The steps include: S1. Disconnect the second end of the first pipe from the second end of the second pipe, so that the second end of the first pipe is disconnected from the second end of the second pipe. S2, applying force to drive the second end of the first pipe to move a distance away from the second end of the second pipe along the first axis, so that the second end of the first pipe and the second end of the second pipe release the clamping of the gasket; S3, apply force to pull out the gasket; S4. Providing a blind plate that can be detachably connected to the second end of the first pipe, inserting the blind plate between the second end of the first pipe and the second end of the second pipe, and connecting the blind plate to the second end of the first pipe to seal the second end of the first pipe; S5. Introduce test gas into the exhaust pipe to perform an airtightness / air pressure test.

10. The test method according to claim 9, characterized in that: The following steps are also included: S6. After the test in step S5 is completed, the blind plate is removed; the gasket is re-installed between the second end of the first pipe and the second end of the second pipe, and the second end of the first pipe and the second end of the second pipe are reconnected and fixed.

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