Compensation installation method of pressure guide pipe in oxygen station cold box

Abstract

The application discloses a compensation installation method of a guide pressure pipe in a cold box of an oxygen production station, and comprises the following steps: determining the leading sequence and basic trend of the guide pressure pipe in the cryogenic area, preparing the guide pressure pipe, setting related supports of the guide pressure pipe, installing the guide pressure pipe and conducting pressure test of the guide pressure pipe, wherein the main construction contents and the compensation setting method are scientifically and reasonably arranged, the construction quality of the guide pressure pipe in the cold box is improved, the guide pressure pipe is laid by combining a sliding support with a fixed support, and a plurality of arc-shaped bends and horizontal arc-shaped bends are arranged, so that the cold contraction deformation of the guide pressure pipe under ultra-low temperature is reliably compensated, the construction quality and the operation safety of the guide pressure pipe after the oxygen production station is put into operation are ensured, and thus the problem that the guide pressure pipe is cold contracted and deformed under ultra-low temperature and cannot completely meet the normal operation requirement of the guide pressure pipe under the cryogenic state in the prior art is solved.

Description

Technical Field

[0001] This invention relates to the field of oxygen plant cold box installation technology, specifically a compensation installation method for the pressure guiding pipe inside the oxygen plant cold box. Background Technology

[0002] Pressure-conducting pipes are a type of piping in instrumentation engineering used to measure pressure, level, flow rate, and component analysis. They are in direct contact with the process medium and are among the most frequently used, demanding, and complex types of piping in instrumentation installations. Cryogenic separation is currently the primary method for separating oxygen, nitrogen, argon, and other gases from air in oxygen production plants. During cryogenic air separation, the temperatures of the liquid and gaseous media in the containers, equipment, and main pipelines within the cryogenic chamber are far below -100°C. Insulation within the cryogenic chamber is achieved through the filling of insulating materials. Under cryogenic conditions, the pressure-conducting pipes leading from the containers, equipment, and main pipelines to the valves on the cryogenic chamber wall undergo significant shrinkage and deformation. Whether this portion of the pressure-conducting pipe can operate normally at ultra-low temperatures directly affects the accuracy and reliability of measurements, as well as the construction progress of the oxygen production project, the quality of the final product, and the maintenance difficulty of the pressure-conducting pipes after the oxygen production project is put into operation.

[0003] During the construction phase, the commonly used installation method is to refer to the installation method of pressure-conducting pipes at normal temperature. The elevation and direction of the pressure-conducting pipes are determined according to the instrument piping installation diagram and instrument layout diagram. There is no unified installation sequence or requirement for the pressure-conducting pipes leading out from each pressure tap. Generally, the piping installation diagram is only a general schematic diagram and does not fully consider the cold contraction and deformation of the pressure-conducting pipes under cryogenic conditions, thus failing to fully meet the normal operation requirements of the pressure-conducting pipes under cryogenic conditions. Furthermore, due to the complex environment and confined space of the pressure taps within the cold box, the elevation and direction of the pressure-conducting pipes often change due to collisions with other containers, equipment, or pipelines, making it impossible to strictly follow the piping installation diagram and construction layout diagram. At the same time, the location of each pressure tap within the cold box, the laying path of the pressure-conducting pipes, and the structural form of the cold box determine that traditional installation involves a large amount of work at height. If the installed pressure-conducting pipes lack sufficient expansion and contraction capacity, affecting the accuracy and reliability of measurements and requiring rework, it will involve a large amount of work at height, resulting in significant safety hazards and rework costs. Summary of the Invention

[0004] This invention provides a compensation installation method for the pressure guiding pipe inside the cold box of an oxygen production station, which can solve the problem that the pressure guiding pipe in the prior art will shrink and deform at ultra-low temperatures, and cannot fully meet the normal operation requirements of the pressure guiding pipe under cryogenic conditions.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a compensation installation method for the pressure guiding pipe inside the cold box of an oxygen production station, comprising the following steps: S1. The order and basic direction of the pressure-conducting pipes in the cryogenic region are determined: Familiarize yourself with the instrument piping installation diagram and instrument layout diagram. Based on the location of the pressure taps or sampling ports for pressure, flow, level and composition analysis in the cryogenic zone of the inner container of the cold box and related accessories, as well as the areas where the pressure guide pipes are relatively concentrated during installation, and in conjunction with the location of the transmitter room and analysis room of the oxygen production station, determine the order and basic direction of the pressure guide pipes leading out of each pressure tap or sampling port when connecting the pressure guide pipes. S2. Preparation of pressure-conducting tubing: Prepare qualified pressure-conducting pipes according to their model, specifications, and material requirements; S3. Support settings for pressure guide tubes: Sliding brackets are installed at the connection points of the inner container of the cold box and the related pressure tapping short pipes and pressure guiding pipes. The sliding brackets support the laid pressure guiding pipes and ensure that the pressure guiding pipes can freely expand and contract at ultra-low temperatures. Multiple fixed brackets are installed along the laying direction of the pressure guiding pipes. S4. Installation of pressure-conducting pipeline: Reliably connect the pressure guide pipe and the pressure tapping short pipe according to the process requirements, and set the first arc bend on the pressure guide pipe in front of the sliding bracket so that the extension direction of the pressure guide pipe is vertically upward. Lay the pressure guide pipe vertically upward according to the liquid level height requirements of the inner container of the cold box and related accessories, and extend the pressure guide pipe to the corresponding minimum height. Set the second arc bend to change the direction of the pressure guide pipe, and lay the pressure guide pipe to the perforated plate outlet valve on the cold box wall. Repeat the above steps to complete the installation of other pressure guide pipes. During the process, pay attention to the correct correspondence between each pressure tap and the perforated plate outlet valve when connecting the pipes. S5. Pressure test of the pressure guide tube: Pressure tests were conducted on each pressure guide pipe along with the instrument system to ensure that all pressure guide pipes were properly sealed and met the usage requirements.

[0006] As a preferred option, the pressure-conducting pipe in S2 is a pre-made coil, and degreasing, cleaning, purging and drying are completed before laying.

[0007] Preferably, the spacing between the fixed brackets in the horizontal direction does not exceed 1800mm, and the spacing in the vertical direction does not exceed 3700mm.

[0008] Preferably, in S4, when the pressure guide pipe needs to be laid horizontally to the perforated plate outlet valve, a second arc bend is provided to extend the pressure guide pipe to the horizontal direction; when the pressure guide pipe needs to be laid vertically downward to the perforated plate outlet valve, a second arc bend is provided to extend the pressure guide pipe to the vertical downward direction, and then a third arc bend is provided to extend the pressure guide pipe to the horizontal direction and connect it to the perforated plate outlet valve.

[0009] Preferably, the pressure guide pipe extending in the horizontal direction is provided with a horizontal arc bend before exiting the cold box, and the distance between the horizontal arc bend and the cold box wall is not less than 90mm.

[0010] Preferably, the pressure-conducting tube includes a measuring tube and / or an analytical tube inside the cold box.

[0011] Preferably, the distance between the pressure guide pipe and the cryogenic equipment and container should not be less than 500mm when the pressure guide pipe is laid.

[0012] Compared with the prior art, the beneficial effects of the present invention are: The method of this invention scientifically and rationally arranges the main construction contents and compensation settings, improving the construction quality of the pressure guiding pipe in the cold box. It adopts a structure combining sliding supports and fixed supports to lay the pressure guiding pipe, and uses multiple arc bends and horizontal arc bends to reliably compensate for the cold shrinkage deformation of the pressure guiding pipe at ultra-low temperatures. This ensures the construction quality and the safe operation of the pressure guiding pipe after the oxygen production station is put into operation, thus solving the problem in the prior art that the pressure guiding pipe will shrink and deform at ultra-low temperatures, and cannot fully meet the normal operation requirements of the pressure guiding pipe under cryogenic conditions. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the first embodiment of the present invention; Figure 2 This is a schematic diagram of a second embodiment of the present invention.

[0014] Reference numerals in the attached drawings: 1. Inner container of the cold box and related accessories; 11. Third arc bend; 2. Pressure tapping short pipe; 3. Sliding bracket; 4. First arc bend; 5. Pressure guide pipe; 6. Second arc bend; 7. Horizontal arc bend; 8. Perforated plate outlet valve; 9. Cold box wall; 10. Fixed bracket. Detailed Implementation

[0015] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0016] like Figure 1-2 As shown, in order to solve the problem that the pressure-conducting pipe in the prior art will shrink and deform at ultra-low temperatures, and cannot fully meet the normal operation requirements of the pressure-conducting pipe under cryogenic conditions, this embodiment provides a compensation installation method for the pressure-conducting pipe in the cold box of an oxygen production station, including the following steps: S1. The lead-out sequence and basic direction of the cryogenic region pressure-conducting pipe 5 are determined: Familiarize yourself with the instrument piping installation diagram and instrument layout diagram. Based on the location of the pressure taps or sampling ports for pressure, flow, level and composition analysis in the cryogenic zone of the inner container of the cold box and related supporting equipment 1, and the relatively concentrated areas of the pressure guide pipes 5 during installation, combined with the location of the transmitter room and analysis room of the oxygen production station, determine the order and basic direction of the pressure guide pipes leading out of each pressure tap or sampling port when connecting the pressure guide pipes 5. Here, the pressure guide pipes 5 include the measuring pipes and / or analysis pipes in the cold box. Since the measuring pipes for measuring pressure, level and flow and the analysis pipes for composition analysis in the cold box of the oxygen production project need to be installed simultaneously and synchronously, the measuring pipes and analysis pipes are also included in the pressure guide pipes 5. Each pressure guide pipe 5 can be laid separately, or several pressure guide pipes 5 can be laid together in a group according to the site conditions. When conditions permit, the construction can be organized in a parallel operation manner. S2, Pressure Conductor 5 Preparation: Prepare qualified pressure-conducting pipe 5 according to the model, specifications, and material requirements. Here, pressure-conducting pipe 5 is a pre-coated coil. The length of the pre-coated coil is much longer than that of the straight pipe, which facilitates changing the direction of the pressure-conducting pipe during laying and greatly reduces the number of splicing joints in traditional construction methods. Before laying, complete the degreasing, cleaning, blowing, and drying of the pressure-conducting pipe to avoid possible blockage after the pressure-conducting pipe is completed, and reduce the possible manual cleaning and rework costs in traditional construction methods. S3. Support settings for pressure guide tubes: A sliding bracket 3 is installed at the connection point between the pressure tapping short tube 2 of the inner container of the cold box and related accessories 1 and the pressure guiding tube 5. The sliding bracket 3 supports the laid pressure guiding tube 5 and ensures that the pressure guiding tube 5 can freely expand and contract at ultra-low temperatures. Multiple fixed brackets 10 are installed along the laying direction of the pressure guiding tube 5. The spacing of the fixed brackets 10 in the horizontal direction does not exceed 1800mm and the spacing in the vertical direction does not exceed 3700mm. The fixed brackets 10 are mainly concentrated on the problem of the relatively concentrated pressure guiding tube 5. S4. Installation of pressure-conducting pipeline: According to the process requirements, reliably connect the pressure guide pipe 5 to the pressure tapping short pipe 2, and set the first arc bend 4 on the pressure guide pipe 5 in front of the sliding bracket 3 so that the extension direction of the pressure guide pipe 5 is vertically upward. Lay the pressure guide pipe 5 vertically upward according to the liquid level height requirements of the inner container of the cold box and related accessories 1, and extend the pressure guide pipe 5 to the corresponding minimum height. Set the second arc bend 6 to change the direction of the pressure guide pipe 5, and lay the pressure guide pipe 5 to the perforated plate outlet valve 8 on the cold box wall 9. Repeat the above steps to complete the installation of other pressure guide pipes. During the process, pay attention to the correct correspondence between each pressure tapping port and the perforated plate outlet valve 8 when connecting the pipes. Among them, such as Figure 1 As shown, when the pressure guide pipe 5 needs to be laid horizontally to the perforated plate outlet valve 8, a second arc bend 6 is set to extend the pressure guide pipe to the horizontal direction.

[0017] like Figure 2 As shown, when the pressure guide pipe 5 needs to be laid vertically downward to the perforated plate outlet valve 8, a second arc bend 6 is set to extend the pressure guide pipe 5 to the vertical downward direction, and then a third arc bend 11 is set to extend the pressure guide pipe 5 to the horizontal direction to connect with the perforated plate outlet valve 8. The pressure guide tube 5 is detachable and stablely connected to the first arc bend 4, the second arc bend 6 and the third arc bend 11, and can be added or removed as needed.

[0018] The pressure guide pipe 5 extending in the horizontal direction is provided with a horizontal arc bend 7 before exiting the cold box. The distance between the horizontal arc bend 7 and the cold box wall 9 is not less than 90mm. The horizontal arc bend 7 has the flexibility to move and can meet the expansion and contraction needs of the horizontal pressure guide pipe 5.

[0019] In addition, to prevent the gaseous medium from condensing and liquefying, the distance between the pressure guide pipe 5 and the cryogenic equipment and container should not be less than 500mm when the pressure guide pipe is laid.

[0020] Normal turning angles that are not required for low temperature compensation but only for obstacle avoidance can be constructed in accordance with the specifications. The bending radius of the first arc bend 4, the second arc bend 6 and the third arc bend 11 is generally not less than 20d (d is the outer diameter of the pressure guide pipe). When space is limited, the minimum bending radius is not less than 10d (d is the outer diameter of the pressure guide pipe).

[0021] S5. Pressure test of the pressure guide tube: Pressure tests were conducted on each pressure guide pipe along with the instrument system to ensure that all pressure guide pipes were properly sealed and met the usage requirements.

[0022] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0023] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly and specifically defined.

[0024] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

Claims

1. A method for compensating and installing pressure-conducting pipes inside the cold box of an oxygen production station, characterized in that, Includes the following steps: S1. The order and basic direction of the lead-out of the cryogenic zone pressure-conducting pipe (5) are determined: Familiarize yourself with the instrument piping installation diagram and instrument layout diagram. Based on the location of the pressure taps or sampling ports for pressure, flow, level and composition analysis in the cryogenic zone of the inner container of the cold box and related accessories (1), and the relatively concentrated area of ​​the pressure guide pipes (5) during installation, combined with the location of the oxygen generator room and the analysis room, determine the order and basic direction of the pressure guide pipes leading out of each pressure tap or sampling port when connecting the pressure guide pipes (5). S2, Pressure guiding tube (5) preparation: Prepare qualified pressure-conducting pipes according to their model, specifications and material requirements (5). S3. Support configuration for pressure-conducting tubes: A sliding bracket (3) is set at the position where the pressure tapping short tube (2) of the inner container of the cold box and related accessories (1) is connected to the pressure guiding tube (5). The sliding bracket (3) supports the laid pressure guiding tube (5) and ensures that the pressure guiding tube (5) can freely expand and contract at ultra-low temperature. Multiple fixed brackets (10) are set along the laying direction of the pressure guiding tube (5). S4. Installation of pressure-conducting pipeline: According to the process requirements, the pressure guide pipe (5) is reliably connected to the pressure tapping short pipe (2), and a first arc bend (4) is set on the pressure guide pipe (5) in front of the sliding bracket (3) so that the pressure guide pipe (5) is laid vertically upward. The pressure guide pipe (5) is laid vertically upward according to the liquid level height requirements of the inner container of the cold box and related accessories (1), and the pressure guide pipe (5) is extended to the corresponding minimum height. A second arc bend (6) is set to change the direction of the pressure guide pipe (5), and the pressure guide pipe (5) is laid to the perforated plate outlet valve (8) on the wall of the cold box (9). Repeat the above steps to complete the installation of other pressure guide pipes. During the process, it is necessary to pay attention to the correct correspondence between each pressure tapping port and the perforated plate outlet valve (8) when connecting the pipeline. S5. Pressure test of the pressure guide tube: Pressure tests were conducted on each pressure guide pipe along with the instrument system to ensure that all pressure guide pipes were properly sealed and met the usage requirements.

2. The compensation installation method for the pressure guiding pipe inside the cold box of the oxygen production station according to claim 1, characterized in that: The pressure guide tube (5) in S2 is a finished coil, and degreasing, cleaning, purging and drying are completed before laying.

3. The compensation installation method for the pressure guiding pipe inside the cold box of the oxygen production station according to claim 1, characterized in that: The spacing of the fixed brackets (10) in the horizontal direction shall not exceed 1800mm, and the spacing in the vertical direction shall not exceed 3700mm.

4. The compensation installation method for the pressure guiding pipe inside the cold box of the oxygen production station according to claim 1, characterized in that: In S4, when the pressure guide pipe (5) needs to be laid horizontally to the perforated plate outlet valve (8), a second arc bend (6) is set to extend the pressure guide pipe to the horizontal direction; when the pressure guide pipe (5) needs to be laid vertically downward to the perforated plate outlet valve (8), a second arc bend (6) is set to extend the pressure guide pipe (5) to the vertical downward direction, and then a third arc bend (11) is set to extend the pressure guide pipe (5) to the horizontal direction and connect it to the perforated plate outlet valve (8).

5. The compensation installation method for the pressure guiding pipe inside the cold box of the oxygen production station according to claim 4, characterized in that: The pressure guide pipe (5) extending to the horizontal direction is provided with a horizontal arc bend (7) before exiting the cold box, and the distance between the horizontal arc bend (7) and the cold box wall (9) is not less than 90mm.

6. The compensation installation method for the pressure guiding pipe inside the cold box of the oxygen production station according to claim 1, characterized in that: The pressure-conducting tube (5) includes the measuring tube and / or analysis tube inside the cold box.

7. The compensation installation method for the pressure guiding pipe inside the cold box of the oxygen production station according to claim 1, characterized in that: When laying the pressure guide pipe, the distance between the pressure guide pipe (5) and the cryogenic equipment and container shall not be less than 500mm.

Images