CN116506984B - Pipeline anti-freezing self-control heat tracing cable system - Google Patents
Pipeline anti-freezing self-control heat tracing cable system Download PDFInfo
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- CN116506984B CN116506984B CN202310744016.2A CN202310744016A CN116506984B CN 116506984 B CN116506984 B CN 116506984B CN 202310744016 A CN202310744016 A CN 202310744016A CN 116506984 B CN116506984 B CN 116506984B
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- 238000007710 freezing Methods 0.000 title claims abstract description 21
- 239000007788 liquid Substances 0.000 claims abstract description 82
- 238000010438 heat treatment Methods 0.000 claims abstract description 49
- 238000001514 detection method Methods 0.000 claims abstract description 46
- 238000005485 electric heating Methods 0.000 claims description 13
- 230000008014 freezing Effects 0.000 claims description 5
- 230000000903 blocking effect Effects 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 239000000284 extract Substances 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 238000004321 preservation Methods 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 230000001105 regulatory effect Effects 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 5
- 239000010410 layer Substances 0.000 description 5
- 230000007613 environmental effect Effects 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 238000013016 damping Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000011241 protective layer Substances 0.000 description 3
- 230000002528 anti-freeze Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005294 ferromagnetic effect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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- 239000010959 steel Substances 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/40—Heating elements having the shape of rods or tubes
- H05B3/54—Heating elements having the shape of rods or tubes flexible
- H05B3/56—Heating cables
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
- H05B1/0227—Applications
- H05B1/023—Industrial applications
- H05B1/0244—Heating of fluids
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
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- Laying Of Electric Cables Or Lines Outside (AREA)
- Pipe Accessories (AREA)
Abstract
The invention relates to the field of electric tracing heat preservation, in particular to a pipeline anti-freezing self-control heat tracing cable system, which comprises: the pipeline heat tracing unit is used for providing heat energy for the target pipeline; the information acquisition unit is used for acquiring information to be detected; the analysis control unit is used for starting the first electric tracing module under the first analysis control condition, determining the working mode of the pipeline tracing unit according to the ambient temperature, and determining the starting number of the second electric tracing module according to the liquid flow rate of the input end of the target pipeline or the flow rate of the target pipeline; the compensation adjusting unit is used for determining whether the single second electric tracing module is started and the heating temperature according to the vibration frequency of each vibration detection point of the target pipeline, and adjusting the heating temperature of the first electric tracing module according to the starting quantity of the second electric tracing modules at two ends of the single first electric tracing module; the invention improves the heat tracing and heat preserving efficiency of the pipeline electric heat tracing system.
Description
Technical Field
The invention relates to the field of electric tracing heat preservation, in particular to a pipeline anti-freezing self-control heat tracing cable system.
Background
Pipeline electric tracing is a method for maintaining pipeline temperature by utilizing an electric heating mode. In some occasions needing to keep the temperature of the pipeline, such as oil pipelines, chemical pipelines, cooling water pipelines and the like, if the temperature of the pipeline is too low, fluid is solidified or crystallized, or a medium in the pipeline cannot meet the process requirements, the pipeline electric tracing technology is needed. However, when electric tracing heat preservation is performed on a pipeline, electric energy loss is large, so that how to correspondingly adjust an electric tracing device according to the actual condition of liquid in the pipeline is a problem to be solved by people.
Chinese patent publication No. CN103883834a discloses a single core serial electric tracing system comprising: the heating device comprises a heated pipeline and is characterized in that three parallel ferromagnetic pipelines are uniformly arranged on the outer side wall of the heated pipeline, three single-core serial electric heating belts are respectively arranged in the three ferromagnetic pipelines in a penetrating mode, one ends of the three single-core serial electric heating belts are connected with a power supply box, and the other ends of the three single-core serial electric heating belts are connected with a tail end box. It can be seen that the single-core serial electric tracing system has the following problems: the electric tracing system cannot be adjusted pertinently according to the actual flowing condition of liquid in the pipeline and environmental influence factors, so that the electric energy loss is high and the electric tracing efficiency is poor.
Disclosure of Invention
Therefore, the invention provides a pipeline anti-freezing self-control heat tracing cable system, which is used for solving the problem that in the prior art, the heating efficiency of an electric tracing system is poor because the electric tracing system cannot be adjusted pertinently according to the actual flowing condition of liquid in a pipeline.
In order to achieve the above purpose, the invention provides a pipeline anti-freezing self-control heat tracing cable system, comprising:
the pipeline heat tracing unit is connected with the target pipeline and comprises a plurality of first electric heat tracing modules and a plurality of second electric heat tracing modules which are arranged on the surface of the target pipeline at intervals and used for providing heat energy for the target pipeline;
the information acquisition unit is connected with the pipeline heat tracing unit and is used for acquiring information to be detected of the target pipeline, wherein the information to be detected comprises the flow rate of liquid in the target pipeline, the ambient temperature, the flow rate of liquid at the input end of the target pipeline and the vibration frequency of the pipeline;
the analysis control unit is connected with the information acquisition unit and the pipeline heat tracing unit and is used for determining the working mode of the pipeline heat tracing unit according to the ambient temperature under the first analysis control condition and determining the opening number of the second electric heat tracing modules according to the liquid flow rate of the input end of the target pipeline or the liquid flow rate in the target pipeline;
the compensation adjusting unit is respectively connected with the pipeline heat tracing unit, the information acquisition unit and the analysis control unit and is used for determining the heating temperature of a single second electric heat tracing module according to the vibration frequency of each vibration detection point of the target pipeline, adjusting the heating temperature of the first electric heat tracing module according to the opening quantity of the second electric heat tracing modules at two ends of the single first electric heat tracing module and controlling the first electric heat tracing module to adopt a start-stop rotation working mode;
the first analysis control condition is that the ambient temperature is smaller than a preset ambient temperature standard.
Further, the pipe heat tracing unit includes:
the first electric tracing modules heat the target pipeline through first electric tracing lines, and the first electric tracing lines are spirally wound and installed on the surface of the target pipeline;
the second electric heat tracing modules heat the target pipeline through second electric heat tracing lines, and the second electric heat tracing lines are spirally wound and installed on the surface of the target pipeline, wherein at least two second electric heat tracing modules are arranged between the heating pipeline sections of every two first electric heat tracing modules;
the heat insulation layer is arranged on the outer surface of the target pipeline and used for conducting heat to the target pipeline through coating the first electric tracing module and the second electric tracing module and blocking heat loss of the target pipeline;
the heating length of the first electric tracing circuit aiming at the target pipeline is larger than that of the second electric tracing circuit aiming at the target pipeline.
Further, the analysis control unit determines the working mode of the pipeline heat tracing unit according to the temperature difference between the ambient temperature and the preset ambient temperature standard under the first analysis control condition, and the method comprises the steps of starting only the first electric heat tracing module, starting only the second electric heat tracing module, and starting the first electric heat tracing module and the second electric heat tracing module simultaneously.
Further, the analysis control unit determines the opening quantity in the section of the second electric tracing module according to the liquid flow rate at the input end of the target pipeline under the second analysis control condition, or determines the opening quantity in the section of the second electric tracing module in the corresponding area according to the liquid flow rate detected by each flow rate detection device;
the opening number of the second electric tracing modules and the liquid flow rate of the input end of the target pipeline are in negative correlation; the number of the opened second electric tracing modules in the section is the number of the opened and heated second electric tracing modules between two adjacent first electric tracing modules;
the second analysis control condition is that the analysis control unit judges that the first electric tracing module and the second electric tracing module are started simultaneously.
Further, the analysis control unit calculates a liquid flow rate difference value detected in a single analysis period of the flow rate detection device under a third analysis control condition, if the liquid flow rate difference value is larger than a preset liquid flow rate difference value, the second electric heating modules in the corresponding areas are started or the heating temperature of the second electric heating modules is increased, and the starting number of the second electric heating modules in the corresponding areas of the flow rate detection device and the liquid flow rate difference value are in positive correlation;
the third analysis control condition is that the liquid flow rate at the input end of the pipeline is smaller than the liquid flow rate at the preset minimum input end.
Further, when the liquid flow rate detected by the flow rate detection device is 0 or higher than the flow rate threshold value, the analysis control unit controls all second electric tracing modules in the corresponding area of the flow rate detection device to start heating.
Further, the compensation adjusting unit extracts frequency difference values of initial vibration frequency and final vibration frequency detected in a single analysis period of each vibration detecting device under the first heat tracing control condition, and determines start and stop of a second electric heat tracing module corresponding to the vibration detecting device according to the frequency difference values;
if the frequency difference value is larger than the preset reference frequency difference value, the compensation adjusting unit judges to start the second electric tracing module corresponding to the vibration detecting device;
the first heat tracing control condition is that the analysis control unit judges that only the first electric heat tracing module is started, the initial vibration frequency is the vibration frequency of the target pipeline detected by the vibration detection device when the analysis period starts, and the end vibration frequency is the vibration frequency of the target pipeline detected by the vibration detection device when the analysis period ends.
Further, the compensation adjusting unit determines the heating temperature of the corresponding second electric tracing module according to the frequency difference under the second heat tracing control condition;
the second heat tracing control condition is that the frequency difference value is larger than a preset reference frequency difference value.
Further, when the opening quantity of the second electric tracing modules at the two ends of the first electric tracing module is the first preset opening quantity, the compensation adjusting unit increases the heating temperature of the first electric tracing module;
when the opening quantity is smaller than a first preset opening quantity, reducing the heating temperature of the first electric tracing module, or adjusting the operation mode of the first electric tracing module according to the opening quantity;
the first preset starting quantity is corresponding quantity of all the second electric tracing modules at two ends of the single first electric tracing module.
Further, when the opening quantity is in the range of the regulating quantity, the compensation regulating unit controls the first electric tracing module to adopt a start-stop rotation working mode;
in the start-stop rotation working mode, the first electric tracing module periodically switches the working states of starting heating and stopping operation, the heating and stopping operation time is the same, and the heating and stopping operation time is in positive correlation with the starting number of the second electric tracing module;
the value in the adjusting quantity range is smaller than the first preset opening quantity and larger than 0.
Compared with the prior art, the technical scheme can realize targeted heating aiming at different heating areas, and can reduce the loss of electric energy when the second electric tracing module is closed, and the analysis control unit starts the first electric tracing module under the first analysis control condition, determines the working mode of the pipeline tracing unit according to the temperature difference between the ambient temperature and the preset ambient temperature standard, determines whether to start the second electric tracing module according to the actual condition, and determines the starting quantity of the second electric tracing modules according to the liquid flow rate, so that the working mode of the second electric tracing module is more in accordance with the actual application scene, and further improves the electric tracing efficiency of the invention.
Further, the analysis control unit determines the opening number of the second electric tracing modules according to the liquid flow rate of the input end of the target pipeline under the second analysis control condition, and the larger the liquid flow rate of the input end is, the worse the liquid freezing capacity is, so that the opening number of the second electric tracing modules is determined according to the liquid flow rate of the input end of the target pipeline, and the actual working scene is more met, wherein the opening number of the second electric tracing modules is determined according to the flow rate detected by each flow rate detection device, so that the judgment precision reduction caused by the determination of the opening number of the second electric tracing modules according to the liquid flow rate of the input end is avoided when the liquid flow rate of the input end is lower than the preset standard, and the more accurate detection of frozen pipeline sections can be ensured due to the dense installation positions of the flow rate detection devices, so that the electric tracing efficiency of the invention is further improved.
Further, in the invention, the liquid flow rate detected by the flow rate detection device is 0, and the analysis control unit controls all second electric tracing modules between the two flow rate detection devices to be started, so that the problem of low flow rate detection precision caused by serious icing in a pipeline is avoided, and the safety problem is avoided.
Further, if the frequency difference is larger than the preset reference frequency difference, the second electric tracing module corresponding to the vibration detection device is started, and the vibration detection device is used for detecting whether the second electric tracing module is started or not correspondingly due to impact vibration generated by the ice body on the inner wall of the pipeline and the conveying liquid when the pipeline is frozen, so that the judgment precision of the invention is further improved, and the heat tracing efficiency of the invention is improved.
In the invention, when the opening quantity of the second electric tracing modules at the two ends of the first electric tracing module is in the range of the regulating quantity, the compensation regulating unit controls the first electric tracing module to adopt the start-stop rotation working mode, so that the power consumption of the system is reduced.
Drawings
FIG. 1 is a unit connection diagram of a pipeline anti-freezing self-control heat tracing cable system according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a pipe heat tracing unit according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view of a pipe heat tracing unit according to an embodiment of the invention;
in the figure: 1, a first electric tracing module; 2, a second electric tracing module; 3, an insulating layer; and 4, a flow rate detection device.
Detailed Description
In order that the objects and advantages of the invention will become more apparent, the invention will be further described with reference to the following examples; it should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that, in the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," "outer," and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.
Referring to fig. 1 to 3, the present invention provides a pipeline anti-freezing self-control heat tracing cable system, comprising:
the pipeline heat tracing unit is connected with the target pipeline and comprises a plurality of first electric heat tracing modules 1 and a plurality of second electric heat tracing modules 2 which are arranged on the surface of the target pipeline at intervals and used for providing heat energy for the target pipeline;
the information acquisition unit is connected with the pipeline heat tracing unit and is used for acquiring information to be detected of the target pipeline, wherein the information to be detected comprises the flow rate of liquid in the target pipeline, the ambient temperature, the flow rate of liquid at the input end of the target pipeline and the vibration frequency of the pipeline;
the analysis control unit is connected with the information acquisition unit and the pipeline heat tracing unit and is used for determining the working mode of the pipeline heat tracing unit according to the ambient temperature under the first analysis control condition and determining the opening number of the second electric heat tracing module 2 according to the liquid flow rate of the input end of the target pipeline or the liquid flow rate in the target pipeline;
the compensation adjusting unit is respectively connected with the pipeline heat tracing unit, the information acquisition unit and the analysis control unit and is used for determining the heating temperature of the single second electric heat tracing module 2 according to the vibration frequency of each vibration detection point of the target pipeline, adjusting the heating temperature of the first electric heat tracing module 1 according to the opening quantity of the second electric heat tracing modules 2 at the two ends of the single first electric heat tracing module 1 and controlling the first electric heat tracing module 1 to adopt a start-stop rotation working mode;
the first analysis control condition is that the ambient temperature is smaller than a preset ambient temperature standard, and the information acquisition unit comprises a plurality of flow rate detection devices 4 used for detecting the flow rate of the liquid and vibration detection devices used for detecting the vibration frequency of the vibration detection points, and the vibration detection devices are uniformly arranged in the target pipeline at intervals along the liquid conveying direction.
Specifically, the pipe heat tracing unit includes:
the first electric tracing modules 1 heat the target pipeline through first electric tracing lines, and the first electric tracing lines are spirally wound and installed on the surface of the target pipeline;
the second electric tracing modules 2 are heated by taking a second electric tracing circuit as a target pipeline, and the second electric tracing circuit is spirally wound and installed on the surface of the target pipeline, wherein at least two second electric tracing modules 2 are arranged between the heating pipeline sections of each two first electric tracing modules 1, and the middle points of the heating pipeline sections of two adjacent second electric tracing modules 2 are installation points of the flow velocity detection device 4;
the heat insulation layer 3 is arranged on the outer surface of the target pipeline and used for conducting heat to the target pipeline through coating the first electric tracing module 1 and the second electric tracing module 2 and blocking heat loss of the target pipeline;
the heating length of the first electric tracing circuit for the target pipeline is larger than the heating length of the second electric tracing circuit for the target pipeline, and the vibration detection devices are respectively arranged at the middle points of the heating pipeline sections of the second electric tracing modules 2 and are marked as vibration detection points.
The first electric tracing circuit and the second electric tracing circuit are electric tracing cables, and each electric tracing cable comprises a heat conducting core and a protective layer coated on the surface of the heat conducting core. The heat conducting core can be made of a resistance wire made of metal or alloy materials, and the length and the sectional area of the heat conducting core can be designed according to practical application requirements. When current passes through the heat conducting core, electric energy is converted into heat energy due to the large resistance value of the resistance wire, so that the heat conducting core generates high temperature. The protective layer is made of high-temperature heat-resistant, corrosion-resistant and good-insulation materials, such as a polyethylene protective layer, and is used for preventing the heat conducting core from contacting with the external environment and protecting the heat conducting core from mechanical damage and corrosion;
the heat-insulating layer 3 may be a polyurethane heat-insulating layer, which is easily understood by those skilled in the art, and will not be described herein in detail.
The power supply mode of the electric heat tracing cable of the first electric heat tracing module 1 adopts a serial mode, namely the power supply of each first electric heat tracing module 1 adopts the same power supply line to supply power; the power supply mode of the electric tracing cable of the second electric tracing module 2 adopts a serial-parallel connection mode, namely, the second electric tracing module 2 between two adjacent first electric tracing modules 1, which is close to the liquid input end, is marked as a first power supply mode module, the second electric tracing module 2, which is close to the liquid output end, is marked as a third power supply mode module, the second electric tracing module 2 between the first power supply mode module and the third power supply mode module is marked as a second power supply mode module, the modules in the same power supply mode adopt serial power supply, and the modules in different power supply modes adopt parallel power supply. Another embodiment is provided, in which each second electric tracing module 2 is powered in parallel, that is, each second electric tracing module 2 can be powered independently, which is understood by those skilled in the art, and the person skilled in the art can select according to the actual working scenario, which is not described herein.
Specifically, the analysis control unit determines the working mode of the pipeline heat tracing unit according to the temperature difference value between the ambient temperature and a preset ambient temperature standard under the first analysis control condition;
if the temperature difference is in the first temperature difference range, the analysis control unit judges that the first electric tracing module 1 is closed and the second electric tracing module 2 is opened;
if the temperature difference is in the second temperature difference range, the analysis control unit judges that the first electric tracing module 1 is started and correspondingly adjusts the heating temperature of the first electric tracing module 1 according to the temperature difference, and the second electric tracing module 2 is not started;
if the temperature difference is in the third temperature difference range, the analysis control unit judges that the first electric tracing module 1 is started, correspondingly adjusts the heating temperature of the first electric tracing module 1 according to the temperature difference, and determines the starting quantity of the second electric tracing module 2 according to the liquid flow rate at the input end of the target pipeline or the liquid flow rates detected by the flow rate detection devices 4;
if the temperature difference is in the fourth temperature difference range, the compensation adjustment unit judges that the first electric tracing module 1 and the second electric tracing module 2 are all started, the first electric tracing module 1 adopts a first standard anti-freezing temperature, and the second electric tracing module 2 adopts a second standard anti-freezing temperature;
wherein the first standard freeze point temperature is greater than the second standard freeze point temperature.
The temperature difference value is a value obtained by subtracting the ambient temperature from a preset ambient temperature standard.
Specifically, the value of the temperature difference range is related to the icing capacity of the liquid transmitted in the target pipeline, that is, a user can determine the icing volume of the liquid in unit time at the same flow rate and different temperatures according to experiments, and determine the value of the temperature difference range in combination with the icing inhibition requirement of the user on the system, wherein the preset environmental temperature standard is the critical temperature corresponding to the icing of the liquid in the pipeline, the values in the first temperature difference range are smaller than the values in the second temperature difference range, the values in the second temperature difference range are smaller than the values in the third temperature difference range, and the values in the third temperature difference range are smaller than the values in the fourth temperature difference range, which is understood by those skilled in the art and will not be repeated herein.
Specifically, the analysis control unit determines the opening quantity in the section of the second electric tracing module 2 according to the liquid flow rate at the input end of the target pipeline under the second analysis control condition, or determines the opening quantity in the section of the second electric tracing module 2 in the corresponding area according to the liquid flow rate detected by each flow rate detection device 4;
wherein, the opening number of the second electric tracing module 2 and the liquid flow rate at the input end of the target pipeline are in a negative correlation; the number of the opened second electric tracing modules 2 in the section is the number of the opened and heated second electric tracing modules 2 between two adjacent first electric tracing modules 1;
the second analysis control condition is that the analysis control unit judges that the first electric tracing module 1 and the second electric tracing module 2 are started simultaneously.
In particular, when the flow rate of the liquid is small, the temperature distribution inside the liquid is uneven, and the temperature of the liquid closer to the wall surface of the pipe is easily lowered below the freezing point, thereby causing the pipe to freeze. When the flow rate of the liquid is increased, the temperature distribution in the liquid is more uniform, and the heat of the liquid is more easily exchanged with the outside, so that the pipeline is effectively prevented from freezing; in addition, the increase of the liquid flow rate also increases the kinetic energy of the liquid, so that liquid molecules are more difficult to condense into a crystal structure, thereby further reducing the possibility of liquid icing, and therefore the opening number of the second electric tracing module 2 is inversely related to the liquid flow rate at the input end of the target pipeline.
Specifically, the analysis control unit calculates a liquid flow rate difference value detected in a single analysis period of the flow rate detection device 4 under a third analysis control condition, if the liquid flow rate difference value is greater than a preset liquid flow rate difference value, the second electric heating module 2 of the corresponding area is started or the heating temperature of the second electric heating module 2 is increased, and the starting number of the second electric heating modules 2 of the corresponding area and the liquid flow rate difference value are in a positive correlation;
the third analysis control condition is that the liquid flow rate at the input end of the pipeline is smaller than the liquid flow rate at the preset minimum input end.
The liquid flow rate difference is the flow rate detected at the beginning of a single analysis period minus the flow rate detected at the end of the single analysis period.
Specifically, the value of the preset liquid flow rate difference may be determined according to an experiment, that is, the user can simulate the liquid flow rate difference detected by the flow rate detecting device 4 under different icing volumes according to the experiment, determine the flow rate difference of the liquid flow rate corresponding to the icing volume exceeding the allowable icing volume of the user, and record the flow rate difference as the preset liquid flow rate difference.
Specifically, the analysis control unit controls all the second electric tracing modules 2 in the corresponding area of the flow rate detection device 4 to start heating when the flow rate of the liquid detected by the flow rate detection device 4 is 0 or higher than the flow rate threshold, and preferably, the flow rate threshold can be set to 80% of the maximum flow rate of the liquid allowed by the target pipeline.
Specifically, the compensation adjusting unit extracts the frequency difference value of the initial vibration frequency and the final vibration frequency detected in a single analysis period of each vibration detecting device under the first heat tracing control condition, and determines the start and stop of the second electric heat tracing module 2 corresponding to the vibration detecting device according to the frequency difference value;
if the frequency difference value is larger than the preset reference frequency difference value, the compensation adjusting unit judges to start the second electric tracing module 2 corresponding to the vibration detecting device;
the first heat tracing control condition is that the analysis control unit judges that only the first electric heat tracing module 1 is started, the initial vibration frequency is the vibration frequency of the target pipeline detected by the vibration detection device when the analysis period starts, and the end vibration frequency is the vibration frequency of the target pipeline detected by the vibration detection device when the analysis period ends.
Specifically, the vibration frequency of the pipeline is affected by the icing in the pipeline, and the vibration frequency of the pipeline is affected by the icing in the pipeline due to the fact that physical characteristics such as mass distribution, elastic modulus and damping of the pipeline are changed. In the case of ice formation in the pipe, the mass distribution of the pipe is increased due to the relatively high ice density, thereby changing some of the natural frequencies of the pipe. Meanwhile, since the rigidity of ice is relatively large, damping in the pipe is increased, thereby affecting vibration damping characteristics of the pipe. Further, the friction of ice and the contact area of the pipe wall surface increase, which also affects the vibration characteristics of the pipe.
Specifically, the value of the preset reference frequency difference may be obtained through experiments, that is, a user may determine the pipeline vibration frequency in the normal operation state and the pipeline vibration frequency in different environmental temperatures through experiments, and the difference between the pipeline vibration frequency corresponding to the freezing temperature critical point in the pipeline and the pipeline vibration frequency in the normal operation state is recorded as the value of the preset reference frequency difference.
Specifically, the compensation adjustment unit determines the heating temperature of the corresponding second electric tracing module 2 according to the frequency difference under the second heat tracing control condition;
the heating temperature and the frequency difference value of the second electric tracing module 2 are in positive correlation;
the second heat tracing control condition is that the frequency difference value is larger than a preset reference frequency difference value.
Specifically, when the opening number of the second electric tracing modules 2 at two ends of the first electric tracing module 1 is a first preset opening number, the compensation adjusting unit increases the heating temperature of the first electric tracing module 1;
when the opening number is smaller than a first preset opening number, reducing the heating temperature of the first electric tracing module 1 or adjusting the operation mode of the first electric tracing module 1 according to the opening number;
the first preset starting quantity is corresponding quantity of all the second electric tracing modules at two ends of the single first electric tracing module.
Specifically, when the opening quantity is in the range of the regulating quantity, the compensation regulating unit controls the first electric tracing module 1 to adopt a start-stop rotation working mode;
in the start-stop rotation working mode, the first electric tracing module 1 periodically switches the working states of starting heating and stopping operation, the heating and stopping operation time is the same, and the heating and stopping operation time is in positive correlation with the starting number of the second electric tracing modules 2;
the value in the adjusting quantity range is smaller than the first preset opening quantity and larger than 0.
Specifically, the user can determine the value of the adjustment quantity range according to the heating requirement of the user on the system and the actual application scene, and it is ensured that the value of the adjustment quantity range is smaller than 6.
Examples: in this embodiment, the pipeline anti-freezing self-control heat tracing cable system is applied to a water supply pipeline, the maximum flow rate of the water supply pipeline is 30 cubic meters per hour, the water supply pipeline is made of steel, the diameter of the water supply pipeline is 30cm, a 300-meter pipeline part of the water supply pipeline is placed in an outdoor environment, and heat tracing and heat preservation are performed on the part in this embodiment.
In this embodiment, the flow velocity detection device 4 is a thermal conduction type flow velocity detection device, and the information acquisition unit includes a temperature detection device arranged in the working environment, a water supply flow velocity detection device arranged at the input end of the water supply pipeline, and a grating vibration detection device arranged in the pipeline;
the working parameters of the analysis control unit are as follows: the preset environmental temperature standard is 0, the first temperature difference range is (0, 10), the second temperature difference range is [10,20 ], and the third temperature difference range is greater than or equal to 20, wherein the unit is DEG C;
the first standard antifreeze temperature is 15 ℃, and the second standard antifreeze temperature is 10 ℃;
the preset liquid flow velocity difference is 8 cubic meters per hour;
the working parameters of the compensation adjusting unit are as follows: the preset reference frequency difference is 10Hz, the adjusting quantity range is (0, 5), and the unit is one.
The single analysis period was set to 1h, with each detector having an analysis period less than 0.5 times the analysis period.
Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will be within the scope of the present invention.
The foregoing description is only of the preferred embodiments of the invention and is not intended to limit the invention; various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A self-controlling heat trace cable system for preventing freezing of a pipeline, comprising:
the pipeline heat tracing unit is connected with the target pipeline and comprises a plurality of first electric heat tracing modules and a plurality of second electric heat tracing modules which are arranged on the surface of the target pipeline at intervals and used for providing heat energy for the target pipeline;
the information acquisition unit is connected with the pipeline heat tracing unit and is used for acquiring information to be detected of the target pipeline, wherein the information to be detected comprises the flow rate of liquid in the target pipeline, the ambient temperature, the flow rate of liquid at the input end of the target pipeline and the vibration frequency of the pipeline;
the analysis control unit is connected with the information acquisition unit and the pipeline heat tracing unit and is used for determining the working mode of the pipeline heat tracing unit according to the ambient temperature under the first analysis control condition and determining the opening number of the second electric heat tracing modules according to the liquid flow rate of the input end of the target pipeline or the liquid flow rate in the target pipeline;
the compensation adjusting unit is respectively connected with the pipeline heat tracing unit, the information acquisition unit and the analysis control unit and is used for determining the heating temperature of a single second electric heat tracing module according to the vibration frequency of each vibration detection point of the target pipeline, adjusting the heating temperature of the first electric heat tracing module according to the opening quantity of the second electric heat tracing modules at two ends of the single first electric heat tracing module and controlling the first electric heat tracing module to adopt a start-stop rotation working mode;
the first analysis control condition is that the ambient temperature is smaller than a preset ambient temperature standard;
the pipe heat tracing unit includes:
the first electric tracing modules heat the target pipeline through first electric tracing lines, and the first electric tracing lines are spirally wound and installed on the surface of the target pipeline;
the second electric heat tracing modules heat the target pipeline through second electric heat tracing lines, and the second electric heat tracing lines are spirally wound and installed on the surface of the target pipeline, wherein at least two second electric heat tracing modules are arranged between the heating pipeline sections of every two first electric heat tracing modules;
the heat insulation layer is arranged on the outer surface of the target pipeline and used for conducting heat to the target pipeline through coating the first electric tracing module and the second electric tracing module and blocking heat loss of the target pipeline;
the heating length of the first electric tracing circuit aiming at the target pipeline is longer than that of the second electric tracing circuit aiming at the target pipeline;
the analysis control unit determines the working mode of the pipeline heat tracing unit according to the temperature difference between the ambient temperature and a preset ambient temperature standard under the first analysis control condition, and comprises the steps of starting only the first electric heat tracing module, starting only the second electric heat tracing module, and starting the first electric heat tracing module and the second electric heat tracing module simultaneously;
the analysis control unit determines the opening quantity in the section of the second electric tracing module according to the liquid flow rate of the input end of the target pipeline under the second analysis control condition, or determines the opening quantity in the section of the second electric tracing module in the corresponding area according to the liquid flow rate detected by each flow rate detection device;
the opening number of the second electric tracing modules and the liquid flow rate of the input end of the target pipeline are in negative correlation; the number of the opened second electric tracing modules in the section is the number of the opened and heated second electric tracing modules between two adjacent first electric tracing modules;
the second analysis control condition is that the analysis control unit judges that the first electric tracing module and the second electric tracing module are started simultaneously;
the analysis control unit calculates the liquid flow rate difference value detected in a single analysis period of the flow rate detection device under the third analysis control condition, if the liquid flow rate difference value is larger than the preset liquid flow rate difference value, the second electric heating modules in the corresponding areas are started or the heating temperature of the second electric heating modules is increased, and the starting number of the second electric heating modules in the corresponding areas of the flow rate detection device and the liquid flow rate difference value are in positive correlation;
the third analysis control condition is that the liquid flow rate at the input end of the pipeline is smaller than the liquid flow rate at the preset minimum input end.
2. The pipeline anti-freezing self-control heat tracing cable system according to claim 1, wherein the analysis control unit controls all second electric heat tracing modules in the corresponding area of the flow rate detection device to start heating when the flow rate of the liquid detected by the flow rate detection device is 0 or higher than a flow rate threshold value.
3. The pipeline anti-freezing self-control heat tracing cable system according to claim 2, wherein the compensation adjusting unit extracts a frequency difference value of an initial vibration frequency and a termination vibration frequency detected in a single analysis period of each vibration detecting device under the first heat tracing control condition, and determines start and stop of a second electric heat tracing module corresponding to the vibration detecting device according to the frequency difference value;
if the frequency difference value is larger than the preset reference frequency difference value, the compensation adjusting unit judges to start the second electric tracing module corresponding to the vibration detecting device;
the first heat tracing control condition is that the analysis control unit judges that only the first electric heat tracing module is started, the initial vibration frequency is the vibration frequency of the target pipeline detected by the vibration detection device when the analysis period starts, and the end vibration frequency is the vibration frequency of the target pipeline detected by the vibration detection device when the analysis period ends.
4. The pipeline anti-freezing self-control heat tracing cable system according to claim 3, wherein the compensation adjustment unit determines the heating temperature of the corresponding second electric heat tracing module according to the frequency difference under the second heat tracing control condition;
the second heat tracing control condition is that the frequency difference value is larger than a preset reference frequency difference value.
5. The pipeline anti-freezing self-control heat tracing cable system according to claim 4, wherein the compensation adjusting unit increases the heating temperature of the first electric heat tracing module when the opening number of the second electric heat tracing modules at the two ends of the first electric heat tracing module is a first preset opening number;
when the opening quantity is smaller than a first preset opening quantity, reducing the heating temperature of the first electric tracing module, or adjusting the operation mode of the first electric tracing module according to the opening quantity;
the first preset starting quantity is corresponding quantity of all the second electric tracing modules at two ends of the single first electric tracing module.
6. The pipeline anti-freezing self-control heat tracing cable system according to claim 5, wherein the compensation adjusting unit controls the first electric heat tracing module to adopt a start-stop rotation working mode when the starting number is in an adjusting number range;
in the start-stop rotation working mode, the first electric tracing module periodically switches the working states of starting heating and stopping operation, the heating and stopping operation time is the same, and the heating and stopping operation time is in positive correlation with the starting number of the second electric tracing module;
the value in the adjusting quantity range is smaller than the first preset opening quantity and larger than 0.
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| CN202310744016.2A CN116506984B (en) | 2023-06-25 | 2023-06-25 | Pipeline anti-freezing self-control heat tracing cable system |
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| CN202310744016.2A CN116506984B (en) | 2023-06-25 | 2023-06-25 | Pipeline anti-freezing self-control heat tracing cable system |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9709708D0 (en) * | 1997-05-13 | 1997-07-02 | Foster Wheeler Energy Ltd | Hot water heat tracing |
| CN217341259U (en) * | 2022-02-09 | 2022-09-02 | 江苏欣宝科技股份有限公司 | Finished product conveying pipeline for high-efficiency resin reaction kettle |
| CN217444096U (en) * | 2022-04-19 | 2022-09-16 | 明达线缆集团有限公司 | Mineral insulation flexible heating special cable |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP4015188A1 (en) * | 2020-12-18 | 2022-06-22 | Incoe Corporation | Hotrunner process controll |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9709708D0 (en) * | 1997-05-13 | 1997-07-02 | Foster Wheeler Energy Ltd | Hot water heat tracing |
| CN217341259U (en) * | 2022-02-09 | 2022-09-02 | 江苏欣宝科技股份有限公司 | Finished product conveying pipeline for high-efficiency resin reaction kettle |
| CN217444096U (en) * | 2022-04-19 | 2022-09-16 | 明达线缆集团有限公司 | Mineral insulation flexible heating special cable |
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