CN109027442B - Buried steam pipeline heat preservation performance monitoring device and method based on online temperature measurement - Google Patents
Buried steam pipeline heat preservation performance monitoring device and method based on online temperature measurement Download PDFInfo
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- CN109027442B CN109027442B CN201810916583.0A CN201810916583A CN109027442B CN 109027442 B CN109027442 B CN 109027442B CN 201810916583 A CN201810916583 A CN 201810916583A CN 109027442 B CN109027442 B CN 109027442B
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- 238000004321 preservation Methods 0.000 title claims abstract description 32
- 238000009529 body temperature measurement Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000012806 monitoring device Methods 0.000 title claims abstract description 12
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 108
- 239000010959 steel Substances 0.000 claims abstract description 108
- 238000012544 monitoring process Methods 0.000 claims abstract description 43
- 238000009413 insulation Methods 0.000 claims description 25
- 238000010438 heat treatment Methods 0.000 claims description 14
- 239000013307 optical fiber Substances 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 abstract description 8
- 238000009434 installation Methods 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 32
- 230000003287 optical effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000009933 burial Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/14—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/005—Protection or supervision of installations of gas pipelines, e.g. alarm
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pipeline Systems (AREA)
Abstract
The invention discloses a buried steam pipeline heat preservation performance monitoring device and method based on online temperature measurement. The direct-buried steam pipe comprises a main pipe compensation joint and a fixed joint, wherein the main pipe, the compensation joint and the fixed joint comprise a working pipe, a steel sleeve and a heat preservation layer; the corrugated pipe is welded on the working pipe of the compensation joint, and the steel sleeve of the fixed joint comprises an inner steel sleeve and an outer steel sleeve. And a sensor protection sleeve is coaxially arranged between the main pipeline and the working pipe of the compensation joint and the steel sleeve and between the inner steel sleeve and the outer steel sleeve of the fixed joint and the side of the outer steel sleeve respectively. The online temperature monitoring system comprises a temperature sensor and a remote temperature monitoring terminal. According to the invention, the arrangement and installation modes of the temperature sensors on different pipe fittings of the buried pipe are solved, so that the measurement of the global temperature of the buried pipe is realized.
Description
Technical Field
The invention relates to a heat supply steam pipeline technology, in particular to a buried steam pipeline heat preservation performance monitoring device and method based on online temperature measurement.
Background
The heating power pipeline is a basic component of the heating power pipe network system, and the performance of the heating power pipeline directly determines key characteristic parameters such as energy consumption index, heat supply radius and the like of the heating power pipe network system. Buried pipes have found widespread use as one of the main forms of thermal pipelines.
It should be noted that, due to the characteristics of the working environment of the buried pipe buried deeply, the heat-insulating layer is likely to be invalid due to corrosion, soaking and other reasons, and even the working pipeline leaks and explodes, the performance and the safety of the thermodynamic system are greatly threatened, and great economic loss and adverse social influence are likely to be caused. In addition, since the underground is deeply buried, there is a great difficulty in measuring the heat insulation performance thereof. Therefore, how to realize the efficient and rapid measurement of the heat preservation performance of the buried pipeline becomes the key content of the performance detection of the current thermodynamic pipeline system.
Aiming at the problem that the existing heating power pipeline cannot realize the measurement of the whole-process temperature characteristic without blind areas, chinese patent CN201711425052.3 proposes to realize the measurement of the whole-process temperature through a novel heating power pipeline which is externally paved with optical cables in the whole process. Chinese patent CN201711424989.9 proposes a thermal pipeline-based optical cable network for measuring temperature and detecting leakage, which implements how to monitor pipeline leakage by using the corresponding relationship of optical cable passing through temperature change and/or noise disturbance signals and by temperature and disturbance. Nevertheless, the main drawbacks of the prior art are the lack of design of the arrangement of the optical cables in the special tubes of the thermal duct and how to achieve the judgment of thermal insulation performance and damage characteristics of the thermal duct by means of global temperature characteristics.
Therefore, how to realize the whole-process measurement of the temperature of the buried pipe according to the characteristics of the buried pipe, and realize the accurate judgment and positioning of the heat insulation performance and leakage loss characteristics of the pipeline based on the temperature characteristics are key to solving the performance maintenance of the buried pipe.
Disclosure of Invention
Aiming at the defects, the invention provides a buried steam pipeline heat preservation performance monitoring device and method based on online temperature measurement.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a direct-buried steam pipeline heat preservation performance monitoring device based on online temperature measurement comprises a direct-buried steam pipe and an online temperature monitoring system; the direct-buried steam pipe comprises a main pipe, a compensation joint and a fixed joint, and the main pipe, the compensation joint and the fixed joint are connected through series welding; the main pipeline, the compensation joint and the fixed joint comprise a working pipe, a steel sleeve and an insulating layer; the working pipe and the steel sleeve are coaxially arranged, the steel sleeve is nested outside the working pipe, and an insulating layer is filled between the working pipe and the steel sleeve; a corrugated pipe is welded on the working pipe of the compensation joint; the steel sleeve in the fixed joint comprises an inner steel sleeve and an outer steel sleeve, the outer steel sleeve is coaxially nested and arranged outside the inner steel sleeve, and an insulating layer is filled between the inner steel sleeve and the outer steel sleeve; a sensor protection sleeve is respectively arranged between the main pipeline and the working pipe of the compensation joint and the steel sleeve and between the inner steel sleeve and the outer steel sleeve of the fixed joint and on the side of the outer steel sleeve, and each section of sensor protection sleeve is communicated in series and continuously penetrates through the whole direct-buried steam pipe; the online temperature monitoring system comprises a temperature sensor and a remote temperature monitoring terminal; the temperature sensor is arranged in the sensor protection sleeve along the way, and the temperature sensors in the main pipeline, the compensation joint and the fixed joint are connected with the remote temperature monitoring terminal in a serial or parallel mode.
In the cross section of the direct-buried steam pipe, the number of the sensor protection sleeves can be one or a plurality of the sensor protection sleeves uniformly distributed along the circumferential direction of the cross section, and each sensor protection sleeve is internally provided with a temperature sensor.
The temperature sensor can be a temperature sensing optical fiber, a thermocouple or a thermal resistor.
The fixed joint can be also provided with a first concentric big head and a second concentric big head; the large-diameter end (i.e. the end with larger diameter) of the first concentric big-and-small head is tightly fixed against the inner wall of the inner steel sleeve, and the small-diameter end (i.e. the end with smaller diameter) is tightly fixed against the outer wall of the working tube, so that a support is formed between the inner steel sleeve and the working tube; the two ends of the outer steel sleeve are respectively provided with a second concentric big-and-small head, the large-diameter ends of the second concentric big-and-small heads at the two ends are tightly fixed with the end face of the outer steel sleeve, and the small-diameter ends are tightly fixed with the outer wall of the inner steel sleeve and used for forming a support between the inner steel sleeve and the outer steel sleeve.
In the fixed section, a through hole for communicating the inner cavity of the inner steel sleeve with the inner cavity of the outer steel sleeve can be formed in the wall of the inner steel sleeve.
The first concentric big-end and the second concentric big-end can be staggered in the axial direction of the pipeline, so that the fixed positions of the first concentric big-end and the second concentric big-end on the inner steel sleeve are not overlapped.
The pipe loss detection method using the on-line temperature measurement-based direct-buried steam pipeline heat preservation performance monitoring device comprises the following steps:
the temperature sensors are pre-installed in the sensor protection sleeves of the main pipeline, the compensation joint and the fixed joint, and after being constructed together with the main pipeline, the compensation joint and the fixed joint, each section of temperature sensor is connected with a remote temperature monitoring terminal in a serial or parallel mode, so that the remote on-line monitoring of the temperature value at any point of the directly buried steam pipeline is realized;
the remote temperature monitoring terminal obtains the temperature T outside the heat preservation layer at any point i Simultaneously obtain the heat supply temperature T s And a pressure P parameter; the temperature change slope k of the outside of the heat preservation layer at any point within the set time interval delta t i And heating temperature parameter change rate k s When k is i /k s When the set threshold value is exceeded, an alarm appears, which indicates that the thermal insulation performance of the point is deteriorated; at the same time, by setting different threshold temperatures T for the steam with different heating temperatures c The method comprises the steps of carrying out a first treatment on the surface of the When the temperature T outside the heat-insulating layer at any point occurs at the same time i Above threshold temperature T c And k i /k s When the set threshold value is exceeded, judging that the heat preservation pipeline is damaged, determining the length of the pipeline damage according to the number of alarm monitoring points, determining the overhauling position and checking hidden danger.
Compared with the prior art, the invention has the following advantages:
(1) According to the invention, the arrangement and installation modes of the temperature sensors on different pipe fittings of the buried pipe are solved, so that the measurement of the global temperature of the buried pipe is realized.
(2) The invention can utilize two thresholds of the temperature of the heat preservation layer, the heat supply temperature change rate and the maximum temperature as evaluation criteria of the thermal performance of the buried pipeline, thereby realizing the purpose of quickly detecting the performance of the buried pipeline.
(3) The invention uses the concentric big and small heads to stagger the fixed connection between the working pipe and the inner steel sleeve, so that the heat exchange temperature difference at the two ends of the concentric big and small heads is reduced, thereby reducing the heat bridge of the supporting structure and being beneficial to heat preservation. And the inner steel sleeve and the outer steel sleeve are fixed by utilizing the concentric big and small heads, so that the supporting performance of the inner steel sleeve and the outer steel sleeve is improved, the deformation of the heat insulation structure is avoided, and the reliability of the heat insulation performance is ensured.
Drawings
FIG. 1 is a schematic diagram of a direct burial steam pipeline thermal insulation performance monitoring device based on-line temperature measurement;
FIG. 2 is a cross-sectional view of a main pipe;
FIG. 3 is another cross-sectional view of a main pipe;
FIG. 4 is a schematic view of a stationary joint in another embodiment;
in the figure: the system comprises a direct-buried steam pipe 1, an online temperature monitoring system 2, a main pipe 1-1, a compensation joint 1-2, a fixed joint 1-3, a working pipe 1-4, a steel sleeve 1-5, an insulating layer 1-6, a corrugated pipe 1-7, an inner steel sleeve 1-8, an outer steel sleeve 1-9, a sensor protection sleeve 1-10, a through hole 1-11, a first concentric big-end 1-12, a second concentric big-end 1-13, a temperature sensor 2-1 and a remote temperature monitoring terminal 2-2.
Detailed Description
The present invention is further described in conjunction with the accompanying drawings so that those skilled in the art can better understand the spirit of the present invention.
As shown in fig. 1, the device for monitoring the heat preservation performance of the directly-buried steam pipeline based on online temperature measurement mainly comprises a directly-buried steam pipe 1 and an online temperature monitoring system 2.
The direct-buried steam pipe 1 comprises a main pipe 1-1, a compensation joint 1-2 and a fixed joint 1-3, wherein the main pipe 1-1, the compensation joint 1-2 and the fixed joint 1-3 are connected through series welding.
The main pipeline 1-1, the compensation joint 1-2 and the fixed joint 1-3 comprise a working pipe 1-4, a steel sleeve 1-5 and an insulating layer 1-6. The main pipeline 1-1, the compensation joint 1-2 and the working pipe 1-4 and the steel sleeve 1-5 in the fixed joint 1-3 are coaxially arranged, the steel sleeve 1-5 is nested outside the working pipe 1-4, and the heat preservation layer 1-6 is filled between the working pipe 1-4 and the steel sleeve 1-5.
A section of corrugated pipe 1-7 is welded on the working pipe 1-4 of the compensation section 1-2 and is used for compensating the axial expansion and contraction of a pipeline. The main pipeline 1-1 and the steel sleeve 1-5 in the compensation joint 1-2 are single-layer sleeves, the steel sleeve 1-5 in the fixed joint 1-3 is a double-layer sleeve, the double-layer sleeve comprises an inner steel sleeve 1-8 and an outer steel sleeve 1-9, an insulating layer 1-6 is filled between the inner steel sleeve 1-8 and the working pipe 1-4, the outer steel sleeve 1-9 is coaxially nested and installed outside the inner steel sleeve 1-8, and an insulating layer 1-6 is also filled between the inner steel sleeve and the outer steel sleeve.
The sensor protection sleeve 1-10 is respectively arranged between the main pipeline 1-1 and the working pipe 1-4 of the compensation joint 1-2 and the steel sleeve 1-5 and between the inner steel sleeve 1-8 of the fixed joint 1-3 and the outer steel sleeve 1-9 and on the side of the outer steel sleeve 1-9, and three sections of the sensor protection sleeve 1-10 in the main pipeline 1-1, the compensation joint 1-2 and the fixed joint 1-3 are communicated in series to form a sensor protection sleeve 1-10 which continuously penetrates through the whole direct-buried steam pipe 1 and is used for protecting an internally-installed sensor.
The online temperature monitoring system 2 comprises a temperature sensor 2-2 and a remote temperature monitoring terminal 2-1; the temperature sensor 2-2 is arranged in the sensor protection sleeve 1-10 along the way, the temperature sensor 2-2 in the main pipeline 1-1, the compensation joint 1-2 and the fixed joint 1-3 is connected with the remote temperature monitoring terminal 2-1 in a serial or parallel mode, and sensed temperature data are transmitted to the remote temperature monitoring terminal 2-1 for storage for subsequent analysis. The sensor protection sleeve 1-10 is wrapped by the heat insulation layer 1-6 on the outside, but the temperature sensed by the internal temperature sensor can reflect the temperature change on the outside of the heat insulation layer because it is laid next to the outermost steel sleeve. The remote temperature monitoring terminal 2-1 is a terminal device capable of receiving signals transmitted from the respective temperature sensors 2-2 in real time, such as a temperature monitor, a temperature recorder, an on-line temperature monitoring analysis system, etc. After the signals received by the remote temperature monitoring terminal 2-1 are converted into temperature data and stored, the temperature data can be manually or automatically sent to other platforms for analysis, and if the remote temperature monitoring terminal has analysis capability, the data can be directly displayed and analyzed at the terminal.
In the cross section of the direct burial steam pipe 1, only one sensor protection sleeve 1-10 can be arranged, and a temperature sensor 2-2 is arranged in the sensor protection sleeve 1-10, as shown in fig. 2. Of course, a plurality of sensor protection sleeves can be uniformly arranged along the circumferential direction of the section, and each sensor protection sleeve 1-10 is provided with a temperature sensor 2-2, as shown in fig. 3, so that the heat insulation performance of different positions of the pipeline can be monitored more accurately.
The temperature sensor 2-2 in the on-line temperature monitoring system 2 may be a temperature sensing optical fiber, a thermocouple or a thermal resistor. The temperature measurement of the temperature sensing optical fiber in the laying range has continuity, so that the temperature sensing optical fiber is only required to be continuously laid along the sensor protection sleeve 1-10, and the temperature data of each point in all the optical fiber laying ranges can be obtained. The temperature measurement of the thermocouple or the thermal resistor is not continuous, and only the temperature of the set position can be reflected, so that the thermocouple or the thermal resistor needs to be arranged in the sensor protection sleeve 1-10 at regular intervals, and the specific arrangement interval and the specific density need to be determined according to the measurement precision. For the complete monitoring of the direct-buried steam pipe 1, the installation area range of the temperature sensor 2-2 should cover all the direct-buried steam pipe 1 ranges to be monitored.
The fixed joint is one of core components in the direct-buried steam pipe, improves the heat protection performance of the fixed joint, avoids the phenomenon of heat leakage, and has important significance for improving the integral heat insulation performance of the direct-buried pipeline. However, the conventional fixed joint structure often has problems in terms of heat insulation thickness or support reliability, resulting in heat leakage. In another embodiment, the fixed joint 1-3 is further improved based on the directly buried steam pipe insulation performance monitoring device. As shown in fig. 4, in the fixed joint 1-3 of this embodiment, in addition to the working pipe 1-4, the insulation layer 1-6, the inner steel sleeve 1-8 and the outer steel sleeve 1-9, there are provided 1 first concentric-sized heads 1-12 and 2 second concentric-sized heads 1-13; the large-diameter end of the first concentric big-small head 1-12 is tightly fixed on the inner wall of the inner steel sleeve 1-8 in a circumferential welding way, and the small-diameter end is tightly fixed on the outer wall of the working tube 1-4 in a circumferential welding way, so that a support is formed between the inner steel sleeve 1-8 and the working tube 1-4. Two ends of the outer steel sleeve 1-9 are respectively provided with a second concentric big-small head 1-13, the large diameter ends of the second concentric big-small heads 1-13 at the two ends are all welded and fixed with the end face of the outer steel sleeve 1-9 in the circumferential direction, and the small diameter ends are tightly adhered to the outer wall of the inner steel sleeve 1-8 in the circumferential direction, so that a support is formed between the inner steel sleeve 1-8 and the outer steel sleeve 1-9. The three concentric big and small heads form stable and reliable support between the double-layer sleeves, and the heat preservation effect can be prevented from being influenced by eccentric phenomenon under the action of external force. And the large diameter end of the second concentric big and small head 1-13 is the same as the diameter of the outer steel sleeve 1-9, the two end faces are coaxial and kept sealed after welding, a sealing space for filling the heat insulation layer 1-6 is formed between the inner steel sleeve 1-8 and the outer steel sleeve 1-9, and the heat insulation thickness can be increased. In such a fixed joint 1-3, the sensor protection sleeve 1-10 needs to pass through the inner cavity of the inner steel sleeve 1-8 at one end of the fixed joint 1-3, then enter the sealed space after passing through the wall of the inner steel sleeve 1-8, then pass through the wall at the other end of the fixed joint 1-3 again, and then return to the inner cavity of the inner steel sleeve 1-8 again. Moreover, the first concentric big-end 1-12 and the second concentric big-end 1-13 are staggered in the axial direction of the pipeline, so that the fixed positions of the first concentric big-end 1-12 and the second concentric big-end 1-13 on the inner steel sleeve 1-8 are not overlapped and have a certain distance. Therefore, under the effect of guaranteeing the support, the heat bridge of the support structure is reduced through staggered arrangement, and the heat insulation performance of the fixed joint is improved. In this embodiment, the fixed position of the first concentric big-end 1-12 on the inner steel casing 1-8 is just in the middle of the fixed positions of the two second concentric big-end 1-13 on the inner steel casing 1-8.
In addition, in the fixed joint 1-3, the pipe wall of the inner steel sleeve 1-8 can be provided with a through hole 1-11 for communicating the inner cavity of the inner steel sleeve 1-8 with the inner cavity of the outer steel sleeve 1-9, so that the high-voltage phenomenon is not generated in the sleeve under special conditions.
The pipe loss detection method using the on-line temperature measurement-based direct-buried steam pipeline heat preservation performance monitoring device comprises the following specific processes:
the temperature sensor 2-2 is pre-installed in the sensor protection sleeve 1-10 of the main pipeline 1-1, the compensation joint 1-2 and the fixed joint 1-3, and after the main pipeline 1-1, the compensation joint 1-2 and the fixed joint 1-3 are constructed together, each section of temperature sensor 2-2 is connected with the remote temperature monitoring terminal 2-1 in a serial or parallel mode, so that the remote online monitoring of the temperature value at any point of the directly buried steam pipeline is realized;
the remote temperature monitoring terminal 2-1 obtains the temperature T outside the heat preservation layer at any point i At the same time obtain the heat supply temperature T of the directly buried steam pipe s And a pressure P parameter; by calculating and monitoring the temperature change slope k of the outside of the heat-insulating layer at any point within a set time interval delta t (the specific value can be adjusted according to actual) i And heating temperature parameter change rate k s When k is i /k s When the set threshold value is exceeded, an alarm appears, which indicates that the thermal insulation performance of the point is deteriorated; at the same time, by setting different threshold temperatures T for the steam with different heating temperatures c The method comprises the steps of carrying out a first treatment on the surface of the When the temperature T outside the heat-insulating layer at any point occurs at the same time i Above threshold temperature T c And k i /k s When the set threshold value is exceeded, judging that the heat preservation pipeline is damaged, determining the length of the pipeline damage according to the number of alarm monitoring points, determining the overhauling position and checking hidden danger.
The specific working process of the invention is as follows:
the temperature sensor is arranged in the pipe fitting when different pipe fittings of the pipeline are manufactured; in the field construction stage, each pipe fitting is installed on the field respectively, meanwhile, temperature sensors among the pipe fittings form a temperature measuring network covering the range of all the pipelines to be monitored in a serial or parallel mode, and the temperature measuring network is connected with a remote temperature monitoring terminal to send temperature monitoring data of each point to the terminal.
In the working process of conveying steam through the buried pipeline, the remote temperature monitoring terminal obtains the heat supply temperature (T) of heat supply steam by reading the heat supply parameters of the direct buried steam pipe s ) And pressure (P). At the same time, the temperature measuring network formed by the temperature sensors arranged in the buried pipeline can obtain the temperature value (T) of the outer side of the heat preservation layer at any position i ) Through T i The thermal insulation performance of the buried pipeline can be evaluated.
Calculating the temperature change characteristics of the insulating layer in a certain time interval (such as 1 hour) to obtain the temperature change rate (k) i ) And the heating temperature parameter change rate (k) s ) When the working pipe leaks, the temperature of the heating steam is not changed greatly, but the temperature outside the heat preservation layer is obviously increased, at the moment, the temperature change rate (k) i ) Obvious rise phenomenon can occur when k i /k s The remote terminal system alarms when the temperature is higher than a set threshold value, and the abnormal heat preservation performance is indicated; with the continuous rise of the temperature, the outside temperature of the heat-insulating layer rises to a certain degree, exceeds the set threshold temperature (T c ) At this point, the heat insulation performance of the pipeline is lost,and judging damage of the heat preservation pipeline, determining the length of the damage of the pipeline according to the number and the positions of the alarm monitoring points, determining the overhauling position and checking hidden danger.
When the working pipe is not leaked, the single heat-insulating layer has the phenomenon of water soaking due to the damage of the outer sleeve, and the like, at the moment, the heat-insulating effect of the heat-insulating layer is reduced, and the temperature change rate (k) of the outer side of the heat-insulating layer i ) Obvious rise phenomenon can occur when k i /k s When the temperature is higher than a set threshold value, an alarm is also generated, which indicates that the heat preservation performance of the pipeline is reduced; however, since the temperature outside the insulation layer is not higher than the threshold temperature, only the insulation performance is reduced, but the replacement standard is not yet reached.
According to the invention, the arrangement and installation modes of the temperature sensors on different pipe fittings of the buried pipe are solved, the measurement of the global temperature of the buried pipe is realized, and in addition, the purpose of quickly detecting the performance of the buried pipe is realized by using two thresholds of the temperature of the heat preservation layer, the heat supply temperature change rate and the maximum temperature as evaluation criteria of the thermal performance of the buried pipe.
Claims (4)
1. The device for monitoring the heat preservation performance of the directly buried steam pipeline based on online temperature measurement is characterized by comprising a directly buried steam pipe (1) and an online temperature monitoring system (2);
the direct-buried steam pipe (1) comprises a main pipe (1-1), a compensation joint (1-2) and a fixed joint (1-3), wherein the main pipe (1-1), the compensation joint (1-2) and the fixed joint (1-3) are connected through series welding;
the main pipeline (1-1), the compensation joint (1-2) and the fixed joint (1-3) comprise a working pipe (1-4), a steel sleeve (1-5) and an insulating layer (1-6); the working pipes (1-4) and the steel sleeves (1-5) are coaxially arranged, the steel sleeves (1-5) are nested outside the working pipes (1-4), and heat preservation layers (1-6) are filled between the working pipes (1-4) and the steel sleeves (1-5);
a corrugated pipe (1-7) is welded on the working pipe (1-4) of the compensation joint (1-2); the steel sleeve (1-5) in the fixed joint (1-3) comprises an inner steel sleeve (1-8) and an outer steel sleeve (1-9), the outer steel sleeve (1-9) is coaxially nested and arranged outside the inner steel sleeve (1-8), and an insulating layer (1-6) is filled between the inner steel sleeve and the outer steel sleeve;
a sensor protection sleeve (1-10) is respectively arranged between the main pipeline (1-1) and the working pipe (1-4) of the compensation joint (1-2) and the steel sleeve (1-5) and on one side close to the steel sleeve (1-5) and between the inner steel sleeve (1-8) of the fixed joint (1-3) and the outer steel sleeve (1-9) and on one side close to the outer steel sleeve (1-9), and the sensor protection sleeves (1-10) of each section are communicated in series and continuously penetrate through the whole direct-buried steam pipe (1);
the online temperature monitoring system (2) comprises a temperature sensor (2-2) and a remote temperature monitoring terminal (2-1); the temperature sensor (2-2) is arranged in the sensor protection sleeve (1-10) along the way, and the temperature sensor (2-2) in the main pipeline (1-1), the compensation joint (1-2) and the fixed joint (1-3) is connected with the remote temperature monitoring terminal (2-1) in a serial or parallel mode;
in the cross section of the directly buried steam pipe (1), the sensor protection sleeve (1-10) is provided with one or a plurality of sensor protection sleeves uniformly distributed along the circumferential direction of the cross section, and each sensor protection sleeve (1-10) is internally provided with a temperature sensor (2-2);
the temperature sensor (2-2) is a temperature sensing optical fiber, a thermocouple or a thermal resistor;
the fixed joint (1-3) is also provided with a first concentric big head (1-12) and a second concentric big head (1-13); the large-diameter end of the first concentric big-small head (1-12) is tightly fixed on the inner wall of the inner steel sleeve (1-8), and the small-diameter end is tightly fixed on the outer wall of the working tube (1-4) and is used for forming a support between the inner steel sleeve (1-8) and the working tube (1-4); two ends of the outer steel sleeve (1-9) are respectively provided with a second concentric big-small head (1-13), the large diameter ends of the second concentric big-small heads (1-13) at the two ends are tightly fixed with the end face of the outer steel sleeve (1-9), and the small diameter ends are tightly fixed with the outer wall of the inner steel sleeve (1-8) and used for forming a support between the inner steel sleeve (1-8) and the outer steel sleeve (1-9).
2. The device for monitoring the heat preservation performance of the directly buried steam pipeline based on-line temperature measurement according to claim 1 is characterized in that in the fixed joint (1-3), a through hole (1-11) which is used for communicating the inner cavity of the inner steel sleeve (1-8) with the inner cavity of the outer steel sleeve (1-9) is arranged on the pipe wall of the inner steel sleeve (1-8).
3. The on-line temperature measurement-based direct-buried steam pipeline thermal insulation performance monitoring device is characterized in that the first concentric big-end (1-12) and the second concentric big-end (1-13) are arranged in a staggered mode in the pipeline axial direction, so that the fixed positions of the first concentric big-end (1-12) and the second concentric big-end (1-13) on the inner steel sleeve (1-8) are not overlapped.
4. A pipe damage detection method using the on-line temperature measurement-based direct-buried steam pipe insulation performance monitoring device according to claim 1, characterized in that:
the temperature sensor (2-2) is pre-installed in the sensor protection sleeve (1-10) of the main pipeline (1-1), the compensation joint (1-2) and the fixed joint (1-3), and is constructed together with the main pipeline (1-1), the compensation joint (1-2) and the fixed joint (1-3), and each section of temperature sensor (2-2) is connected with the remote temperature monitoring terminal (2-1) in a serial connection or parallel connection mode, so that the remote online monitoring of the temperature value at any point of the directly buried steam pipeline is realized;
the remote temperature monitoring terminal (2-1) obtains the temperature T outside the heat preservation layer at any point i Simultaneously obtain the heat supply temperature T s And a pressure P parameter; the temperature change slope k of the outside of the heat preservation layer at any point within the set time interval delta t i And heating temperature parameter change rate k s When k is i /k s When the set threshold value is exceeded, an alarm appears, which indicates that the thermal insulation performance of the point is deteriorated; at the same time, by setting different threshold temperatures T for the steam with different heating temperatures c The method comprises the steps of carrying out a first treatment on the surface of the When the temperature T outside the heat-insulating layer at any point occurs at the same time i Above threshold temperature T c And k i /k s When the set threshold value is exceeded, judging that the heat preservation pipeline is damaged, determining the length of the pipeline damage according to the number of alarm monitoring points, determining the overhauling position and checking hidden danger.
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| CN113970028B (en) * | 2021-11-03 | 2023-07-07 | 安徽启格包装材料有限公司 | Heat preservation device for steam boiler pipeline |
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| DE19509129A1 (en) * | 1995-02-24 | 1996-08-29 | Geso Ges Fuer Sensorik Geotech | Method and device for checking and monitoring the condition of pipes, containers, pipelines or the like |
| CN203857149U (en) * | 2014-04-19 | 2014-10-01 | 辽宁久大管业有限公司 | Directly buried prefabricated heat preservation steam-water joint conveying pipe and mating pipe fitting |
| CN108006330A (en) * | 2017-11-13 | 2018-05-08 | 武汉中电节能有限公司 | A kind of energy-efficient long distance delivery heat supply network method |
| CN208750191U (en) * | 2018-08-13 | 2019-04-16 | 宁波万里管道有限公司 | A kind of buried steam pipeline heat-insulation performance monitoring apparatus based on the measurement of online temperature |
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| DE19509129A1 (en) * | 1995-02-24 | 1996-08-29 | Geso Ges Fuer Sensorik Geotech | Method and device for checking and monitoring the condition of pipes, containers, pipelines or the like |
| CN203857149U (en) * | 2014-04-19 | 2014-10-01 | 辽宁久大管业有限公司 | Directly buried prefabricated heat preservation steam-water joint conveying pipe and mating pipe fitting |
| CN108006330A (en) * | 2017-11-13 | 2018-05-08 | 武汉中电节能有限公司 | A kind of energy-efficient long distance delivery heat supply network method |
| CN208750191U (en) * | 2018-08-13 | 2019-04-16 | 宁波万里管道有限公司 | A kind of buried steam pipeline heat-insulation performance monitoring apparatus based on the measurement of online temperature |
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