CN211602227U - Ultralow temperature pipeline surface temperature measuring device adopting pipe hoop structure - Google Patents
Ultralow temperature pipeline surface temperature measuring device adopting pipe hoop structure Download PDFInfo
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- CN211602227U CN211602227U CN202020444912.9U CN202020444912U CN211602227U CN 211602227 U CN211602227 U CN 211602227U CN 202020444912 U CN202020444912 U CN 202020444912U CN 211602227 U CN211602227 U CN 211602227U
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Abstract
The utility model relates to an ultra-low temperature pipeline surface temperature measuring device adopting a pipe hoop structure, which comprises a pipe hoop, a connecting bolt, a limiting bolt, a temperature measuring block and a temperature measuring element; the pipe hoop is fixed on the periphery of the ultralow-temperature pipeline through a connecting bolt, at least one temperature measuring block is arranged between the pipe hoop and the ultralow-temperature pipeline, one surface of the temperature measuring block, which is in contact with the ultralow-temperature pipeline, is an arc surface, and 2 side surfaces, which are in contact with the pipe hoop, are inclined planes which are inclined towards the outer side and the center of the ultralow-temperature pipeline; the cambered surface is provided with a radian matched with the outer surface of the ultralow-temperature pipeline; the temperature measuring block is provided with a cavity for placing a temperature measuring element. Temperature measuring device adopts detachable connected mode with the ultra-low temperature pipeline, need not carry out trompil and welding operation on the ultra-low temperature pipeline to can monitor the difference in temperature of the upper and lower surface of the ultra-low temperature pipeline for the precooling, the appearance of prevention "banana effect".
Description
Technical Field
The utility model relates to a cryogenic measurement technical field of ultra-low temperature pipeline especially relates to a pipeline surface temperature measuring device that is used for-100- ~ -273 ℃ ultra-low temperature pipeline
Background
At present, pipelines are classified according to working temperature in China, the pipeline with the medium working temperature lower than-40 ℃ is generally called a low-temperature pipeline, and the pipeline with the medium working temperature lower than-100 ℃ is called an ultralow-temperature pipeline. According to this definition, the common ultra-low temperature pipeline working media mainly include: liquid hydrogen, liquid nitrogen, liquid oxygen, and Liquefied Natural Gas (LNG).
The stainless steel and 9% nickel steel have better low-temperature performance, so the steel is widely applied to low-temperature engineering. In view of material performance, economic applicability and application maturity, the stainless steel is more widely applied to low-temperature engineering pipelines.
Because of the dangerousness of the ultralow temperature working medium in the conveying and transferring processes, the surface temperature monitoring of the ultralow temperature pipeline is an important content for the operation monitoring of a low-temperature industrial facility pipe network system. The currently commonly used ultralow temperature measuring elements mainly comprise three types: thermocouples, diodes, and resistance cables. The three temperature measuring elements have different temperature measuring principles and physical characteristics in an ultralow temperature environment, so that the three temperature measuring elements have different advantages and disadvantages and application ranges.
The thermocouple temperature measuring element has the advantages of general precision, relatively small error and widest application.
The diode temperature measuring element has high precision, slightly large error, very low temperature measuring lower limit and shorter service life than other two temperature measuring elements.
The precision and error of the resistance cable temperature measurement are both between the thermocouple and the diode element, and the lower limit of the temperature measurement is higher than the former two. The resistance cable is wound on the outer wall of the pipeline for measurement, and the obtained temperature value is the average temperature value of the pipeline in the circumferential direction; the resistance cable is not suitable for temperature measurement when gas-liquid separation phenomenon exists in the ultra-low temperature pipeline and the ultra-low temperature pipeline is used for precooling operation.
The traditional ultra-low temperature pipeline surface temperature monitoring adopts the following method: the method comprises the steps of determining a temperature measuring position on a selected pipeline, forming a groove on the outer wall of the pipeline at a certain inclination angle, welding a shell-shaped steel plate on the corresponding inner wall of the pipeline, and wrapping the range of the groove in a closed mode, so that a cavity isolated from working media in the pipeline is formed on the inner wall of the position where the hole is formed in the pipeline. A temperature measuring element is arranged in the cavity, a 5-12V direct current power supply is supplied through a cable, and the obtained electric signals are sent out through a signal wire.
The ultra-low temperature pipeline temperature measuring method has the following defects:
1. due to the fact that the liquid hydrogen, liquid oxygen and LNG stations are high in fire-proof and explosion-proof level, the pipeline is not allowed to be cut and welded on an engineering site, and the pipeline can only be perforated and welded in an equipment processing plant. Therefore, the selection of the temperature measuring point on the pipeline is greatly limited, and once the temperature measuring point is determined, the adjustment cannot be carried out.
2. Because the material of the ultralow temperature pipeline is different from that of common carbon steel, the welding performance is relatively poor; the wall thickness of the pipeline with the same DN diameter and the ultralow temperature pipeline is several times that of the ordinary carbon steel pipeline. Therefore, when the ultra-low temperature pipeline is perforated and welded, special welding rods and special welders are needed. After the inner wall of the pipeline is welded, leakage testing operation is required. These procedures described above bring about a significant increase in labor costs.
In addition, for equipment and pipelines for storing and conveying ultralow temperature working media, precooling operation is required when production is resumed after production and overhaul. When the ultra-low temperature pipeline carries out the precooling operation, because precooling working medium can make the upper portion and the lower part of pipeline produce the difference in temperature in transmission and phase transition in-process, can lead to the pipeline to take place "banana effect" when this difference in temperature reaches a certain numerical value, and then lead to irreversible and uncontrollable bending deformation, cause serious economic loss and incident. The temperature of the upper surface and the lower surface of the ultralow-temperature pipeline at different positions in the precooling process is monitored, so that the precooling process can be interfered in real time to avoid banana effect. By comparing the temperature difference of the upper surface and the lower surface of the ultralow-temperature pipeline at the same position, the precooling control method is beneficial to the accurate control of the precooling process, and the accident occurrence probability and the economic loss are reduced to the maximum extent.
Disclosure of Invention
The utility model provides an adopt ultralow temperature pipeline surface temperature measuring device of ferrule structure, temperature measuring device and ultralow temperature pipeline adopt detachable connected mode, need not carry out trompil and welding operation on the ultralow temperature pipeline to can monitor the difference in temperature of precooling with the upper and lower surface of ultralow temperature pipeline, prevent the appearance of "banana effect".
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a measuring device for the surface temperature of an ultralow temperature pipeline adopting a pipe hoop structure comprises a pipe hoop, a connecting bolt, a limiting bolt, a temperature measuring block and a temperature measuring element; the pipe hoop is fixed on the periphery of the ultralow-temperature pipeline through a connecting bolt, at least one temperature measuring block is arranged between the pipe hoop and the ultralow-temperature pipeline, one surface of the temperature measuring block, which is in contact with the ultralow-temperature pipeline, is an arc surface, and 2 side surfaces, which are in contact with the pipe hoop, are inclined planes which are inclined towards the outer side and the center of the ultralow-temperature pipeline; the cambered surface is provided with a radian matched with the outer surface of the ultralow-temperature pipeline; the temperature measuring block is provided with a cavity for placing a temperature measuring element.
The pipe hoop is an annular pipe hoop, two ends of the annular pipe hoop are respectively provided with a connecting section, and the connecting section consists of an inclined section matched with the inclined plane on the temperature measuring block and a straight section used for matching connection; the limiting bolt is arranged at the straight section close to the inclined section, and the connecting bolt is arranged at the straight section far away from the inclined section.
The middle part of the annular pipe hoop is provided with a hinge.
The pipe hoop consists of 2 symmetrical semi-annular pipe hoops; two ends of the semi-annular pipe hoop are respectively provided with a connecting section, and the connecting section consists of an inclined section matched with the inclined plane on the temperature measuring block and a straight section used for matching connection; the limiting bolt is arranged at the straight section close to the inclined section, and the connecting bolt is arranged at the straight section far away from the inclined section.
The temperature measuring element is connected with a direct current power supply through a power line and is connected with a temperature display instrument or a control system through a signal line.
The pipe hoop, the connecting bolt, the limiting bolt and the temperature measuring block are all made of low-temperature-resistant alloy steel.
The top surface and the bottom surface of the ultralow temperature pipeline are respectively provided with 1 temperature measuring block, the signal lines of the temperature measuring elements in the 2 temperature measuring blocks are respectively connected with the signal input end of the logic arithmetic unit, and the signal output end of the logic arithmetic unit is connected with an alarm or a control system.
An opening is formed in one axial end, corresponding to the ultralow-temperature pipeline, of the cavity in the temperature measuring block.
The temperature measuring element is a thermocouple or a diode.
Compared with the prior art, the beneficial effects of the utility model are that:
1) the temperature measuring device of the utility model is convenient to disassemble and move, can measure the surface temperature of the ultralow temperature pipeline at different positions along the circumferential direction, can move and adjust along the radial direction of the ultralow temperature pipeline, and also can measure the surface temperature of different pipeline lengths; compared with the conventional similar measuring device, the device fundamentally improves the adaptability to different process requirements under different working conditions.
2) The temperature measuring device and the ultra-low temperature pipeline of the utility model adopt a detachable connection mode, do not need to perform hole opening and welding operation on the ultra-low temperature pipeline, and basically do not need to perform welding operation in the manufacturing process, thereby fundamentally reducing the material consumption and workload of special welding and the requirement on welders;
3) the temperature measuring element is convenient to replace, the temperature difference between the upper surface and the lower surface of the precooling ultralow-temperature pipeline is calculated by adopting a logic arithmetic unit, and an alarm signal is sent on the basis of logic judgment according to the calculation result;
4) the whole structure is simple, the manufacturing cost is low, and the use is safe and reliable; the system is particularly suitable for large LNG plants and can play a key role in improving the temperature monitoring of ultralow temperature pipelines.
Drawings
Fig. 1 is a schematic structural diagram of an ultra-low temperature pipeline surface temperature measuring device in embodiment 1 of the present invention.
Fig. 2 is a side view of fig. 1.
Fig. 3a is a front view of the annular pipe clamp according to embodiment 1 of the present invention.
Fig. 3b is a side view of fig. 3 a.
Fig. 4 is a schematic structural diagram of the ultra-low temperature pipeline surface temperature measuring device in embodiment 2 of the present invention.
Fig. 5 is a side view of fig. 4.
Fig. 6a is a front view of a semi-annular pipe clamp according to embodiment 2 of the present invention.
Fig. 6b is a side view of fig. 6 a.
Fig. 7a is a front view of the temperature measuring block of the present invention.
Fig. 7b is a top view of the temperature measuring block of the present invention.
In the figure: 1. pipe hoop 11, annular pipe hoop 12, semi-annular pipe hoop 2, connecting bolt 3, limiting bolt 4, temperature measuring block 41, cavity 42, cambered surface 43, inclined surface 5, temperature measuring element 6, logic arithmetic unit 7, ultra-low temperature pipeline 8 and folding paper
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:
as shown in fig. 1, fig. 2, fig. 4 and fig. 5, the ultra-low temperature pipeline surface temperature measuring device adopting the pipe hoop structure of the present invention includes a pipe hoop 1, a connecting bolt 2, a limit bolt 3, a temperature measuring block 4 and a temperature measuring element 5; the pipe hoop 1 is fixed on the periphery of the ultralow-temperature pipeline 7 through the connecting bolt 2, at least one temperature measuring block 4 is arranged between the pipe hoop 1 and the ultralow-temperature pipeline 7, one surface of the temperature measuring block 4, which is in contact with the ultralow-temperature pipeline 7, is an arc surface 42, and 2 side surfaces, which are in contact with the pipe hoop 1, are inclined surfaces 43 inclined towards the outer side and the center of the ultralow-temperature pipeline 7; the cambered surface 42 has a radian matched with the outer surface of the ultralow-temperature pipeline 7; the temperature measuring block 4 is provided with a cavity 41 for placing the temperature measuring element 5.
As shown in fig. 1, fig. 2, fig. 3a, and fig. 3b, the pipe clamp 1 is an annular pipe clamp 11, two ends of the annular pipe clamp 11 are respectively provided with a connection section, and the connection section is composed of an inclined section matched with the inclined surface 43 on the temperature measuring block 4, and a straight section for matching connection; the limiting bolt 3 is arranged at the straight section close to the inclined section, and the connecting bolt 2 is arranged at the straight section far away from the inclined section.
The middle part of the annular pipe hoop 11 is provided with a hinge 8.
As shown in fig. 4, 5, 6a and 6b, the pipe clamp 1 is composed of 2 symmetrical semi-annular pipe clamps 12; two ends of the semi-annular pipe hoop 12 are respectively provided with a connecting section, and the connecting section consists of an inclined section matched with the inclined plane on the temperature measuring block 4 and a straight section used for matching connection; the limiting bolt 3 is arranged at the straight section close to the inclined section, and the connecting bolt 2 is arranged at the straight section far away from the inclined section.
As shown in fig. 2, the temperature measuring element 5 is connected to a dc power supply through a power line, and is connected to a temperature display instrument or a control system through a signal line.
The pipe hoop 1, the connecting bolt 2, the limiting bolt 3 and the temperature measuring block 4 are all made of low-temperature-resistant alloy steel.
As shown in fig. 5, the top surface and the bottom surface of the ultra-low temperature pipeline 7 are respectively provided with 1 temperature measuring block 4, the signal lines of the temperature measuring elements 5 in the 2 temperature measuring blocks 4 are respectively connected with the signal input end of the logic arithmetic unit 6, and the signal output end of the logic arithmetic unit 6 is connected with an alarm or a control system.
As shown in fig. 7a and 7b, the cavity 41 in the temperature block 4 is opened at one axial end corresponding to the ultra-low temperature conduit 7.
The temperature measuring element 5 is a thermocouple or a diode.
The following examples are carried out on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of the present invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.
[ example 1 ]
In this embodiment, adopt ultralow temperature pipeline surface temperature measuring device of ferrule structure, include by cyclic annular ferrule 11, the cyclic annular shutting structure that connecting bolt 2 and spacing bolt 3 formed, a removal for retraining temperature block 4, temperature block 4 sets up 1, spacing bolt 3 forces the laminating of temperature block 4 to fix at ultralow temperature pipeline 7's surface top, connecting bolt 2 and spacing bolt 3 play the connection effect jointly, and provide more safety restraint, prevent that cyclic annular ferrule 11 from losing efficacy under the ultralow temperature environment and causing the droing of temperature block 4.
The middle part of the annular pipe hoop 11 is provided with a hinge 8, which is convenient for the annular pipe hoop 11 to open, disassemble and move. The connecting ends on the two sides of the annular pipe hoop 11 are respectively provided with 4 bolt holes for the limiting bolt 3 and the connecting bolt 2 to pass through.
The temperature measuring block 4 is internally provided with a cavity 41, and the temperature measuring element 5 is arranged and fixed in the cavity 41 during application. The temperature measuring element 5 is connected with a power line and a signal line for carrying out outward processing on the obtained temperature signal. Further, the temperature signal outwards transmits and can choose wired or wireless mode for use, and the temperature signal transmission mode that adopts wireless mode to go on promptly is also in the utility model discloses a protection scope.
The annular pipe hoop 11, the connecting bolt 2, the limiting bolt 3 and the temperature measuring block 4 are all made of alloy steel with good low-temperature performance. After the ultralow temperature pipeline surface temperature measuring device is installed, relevant operations are required to be carried out according to the heat preservation requirement of the ultralow temperature pipeline.
[ example 2 ]
In this embodiment, ultra-low temperature pipeline surface temperature measuring device is used for carrying out the temperature measurement to the upper and lower surface of ultra-low temperature pipeline for the precooling, the device includes by the cyclic annular shutting structure of semi-annular ferrule 12, connecting bolt 2 and spacing bolt 3 formation, be used for the restraint to locate on the ultra-low temperature pipeline 7, the removal of 2 temperature measurement piece 4 of lower surface, spacing bolt 3 forces the laminating of temperature measurement piece 4 to fix in ultra-low temperature pipeline 7's surface one side, connecting bolt 2 and spacing bolt 3 play the connection effect jointly, and provide more safety restraint, prevent that cyclic annular ferrule 11 from losing efficacy under the ultra-low temperature environment and causing the droing of temperature measurement piece 4.
Every 2 semicircular pipe hoops 12 are in a group, are oppositely combined together, are convenient to open, disassemble and move, and are also convenient to replace the temperature measuring blocks 4. The connection sections at the two ends of the semi-annular pipe hoop 12 are respectively provided with 4 bolt holes for the connecting bolt 2 and the limiting bolt 3 to pass through.
The temperature measuring block 4 is internally provided with a cavity 41, and the temperature measuring element 5 is arranged and fixed in the cavity 41 during temperature measurement. The temperature measuring element 5 is connected with a power line and a signal line, and the obtained temperature signal is sent to the logic arithmetic unit 6 for processing in the temperature measuring process. And the logic arithmetic unit 6 receives the temperature signals from the 2 temperature measuring elements 5, calculates the temperature difference of the upper surface and the lower surface of the ultralow-temperature pipeline, and sends out an alarm signal when the difference value is greater than a limit judgment value (5-10 ℃). The specific limit judgment value is related to the diameter of the ultra-low temperature pipeline 7, the limit value is correspondingly improved along with the increase of the diameter of the ultra-low temperature pipeline 7, the temperature difference between the upper surface and the lower surface of the ultra-low temperature pipeline 7 cannot exceed 10 ℃ at most, otherwise, the ultra-low temperature pipeline which is subjected to precooling operation is bent and damaged due to the banana effect.
The alarm mode after the logic arithmetic unit 6 sends the alarm signal can adopt different modes such as sound, light, electricity and the like, and the logic arithmetic unit 6 can also select a wired or wireless mode to send the alarm signal to a remote control room.
Semi-annular ferrule 12, connecting bolt 2, spacing bolt 3 and temperature measurement piece 4 all select the better alloy steel of low temperature performance to make for use, and ultra-low temperature pipeline surface temperature measuring device need carry out relevant operation according to the heat preservation requirement of ultra-low temperature pipeline after the installation is accomplished.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (9)
1. A measuring device for the surface temperature of an ultralow temperature pipeline adopting a pipe hoop structure is characterized by comprising a pipe hoop, a connecting bolt, a limiting bolt, a temperature measuring block and a temperature measuring element; the pipe hoop is fixed on the periphery of the ultralow-temperature pipeline through a connecting bolt, at least one temperature measuring block is arranged between the pipe hoop and the ultralow-temperature pipeline, one surface of the temperature measuring block, which is in contact with the ultralow-temperature pipeline, is an arc surface, and 2 side surfaces, which are in contact with the pipe hoop, are inclined planes which are inclined towards the outer side and the center of the ultralow-temperature pipeline; the cambered surface is provided with a radian matched with the outer surface of the ultralow-temperature pipeline; the temperature measuring block is provided with a cavity for placing a temperature measuring element.
2. The ultra-low temperature pipeline surface temperature measuring device adopting the pipe hoop structure as claimed in claim 1, wherein the pipe hoop is an annular pipe hoop, two ends of the annular pipe hoop are respectively provided with a connecting section, and the connecting section consists of an inclined section matched with the upper inclined surface of the temperature measuring block and a straight section for matching connection; the limiting bolt is arranged at the straight section close to the inclined section, and the connecting bolt is arranged at the straight section far away from the inclined section.
3. The ultra-low temperature pipeline surface temperature measuring device adopting the pipe clamp structure as claimed in claim 2, wherein the middle of the ring-shaped pipe clamp is provided with a hinge.
4. The ultra-low temperature pipeline surface temperature measuring device adopting the pipe clamp structure as claimed in claim 1, wherein the pipe clamp is composed of 2 symmetrical semi-annular pipe clamps; two ends of the semi-annular pipe hoop are respectively provided with a connecting section, and the connecting section consists of an inclined section matched with the inclined plane on the temperature measuring block and a straight section used for matching connection; the limiting bolt is arranged at the straight section close to the inclined section, and the connecting bolt is arranged at the straight section far away from the inclined section.
5. The ultra-low temperature pipeline surface temperature measuring device adopting the pipe hoop structure as claimed in claim 1, wherein the temperature measuring element is connected with a direct current power supply through a power line, and is connected with a temperature display instrument or a control system through a signal line.
6. The ultra-low temperature pipeline surface temperature measuring device adopting the pipe hoop structure as claimed in claim 1, wherein the pipe hoop, the connecting bolt, the limiting bolt and the temperature measuring block are all made of low temperature resistant alloy steel.
7. The ultra-low temperature pipeline surface temperature measuring device adopting the pipe hoop structure as claimed in claim 1, wherein 1 temperature measuring block is respectively arranged on the top surface and the bottom surface of the ultra-low temperature pipeline, the signal lines of the temperature measuring elements in 2 temperature measuring blocks are respectively connected with the signal input end of the logic arithmetic unit, and the signal output end of the logic arithmetic unit is connected with an alarm or a control system.
8. The ultra-low-temperature pipeline surface temperature measuring device adopting the pipe hoop structure as claimed in claim 1, wherein the cavity in the temperature measuring block is provided with an opening at one end corresponding to the axial direction of the ultra-low-temperature pipeline.
9. The ultra-low temperature pipeline surface temperature measuring device adopting the pipe clamp structure as claimed in claim 1, 5 or 7, wherein the temperature measuring element is a thermocouple or a diode.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111289145A (en) * | 2020-03-31 | 2020-06-16 | 中冶焦耐(大连)工程技术有限公司 | Ultralow temperature pipeline surface temperature measuring device adopting pipe hoop structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111289145A (en) * | 2020-03-31 | 2020-06-16 | 中冶焦耐(大连)工程技术有限公司 | Ultralow temperature pipeline surface temperature measuring device adopting pipe hoop structure |
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