Anti-freezing self-temperature-control heat tracing cable

Abstract

The invention relates to the field of oil pipeline heat tracing control, in particular to an anti-freezing self-temperature-control heat tracing cable which comprises a pipeline heat tracing unit used for providing heat energy for a target oil pipeline, and the pipeline heat tracing unit comprises a first heat tracing module and a second heat tracing module; the information acquisition unit is used for acquiring demand data information; the data analysis unit is used for determining the working mode of the pipeline heat tracing unit according to the oil reference quantity and increasing and adjusting the heat tracing temperature of the first heat tracing module when the oil reference quantity is in a preset threshold state; the compensation adjusting unit is used for determining the adjusting mode of the second heat tracing module according to the temperature adjusting effect parameter difference value and judging whether to adjust the first heat tracing module corresponding to the front-stroke compensation pipeline of the pipeline heat tracing unit or not according to the pipeline liquid flow speed; the pipeline heat tracing unit is correspondingly controlled according to the oil liquid heating and heat preservation effect in the actual working scene, and the oil liquid temperature control precision is improved.

Description

Technical Field

[0001] The present invention relates to the field of heat tracing control for oil pipelines, and particularly to an anti-freezing self-regulating heat tracing cable. Background Art

[0002] The electric heat tracing system for oil pipelines is a heating technology for oil pipelines. In a low-temperature environment, the transported oil may become viscous or even solidify. The electric heat tracing system for oil pipelines can provide a constant heating temperature to ensure that the oil maintains appropriate fluidity, avoid pipeline blockage and reduced flow. By installing heating cables or heating tapes on the pipeline surface to provide a constant temperature for the pipeline. However, since the properties of oil are different from those of water, its specific heat capacity is related to the ambient temperature, and the specific heat capacity of oil will change at different temperatures. Therefore, the heat absorption capacity of oil will also be affected. Therefore, how to more precisely control the temperature of the heat tracing cable to improve the heat preservation effect of the oil and the pipeline is an urgent problem for technicians to solve.

[0003] Chinese Patent Publication No. CN110081312B discloses an oilfield pipeline heat tracing control system. The system includes: a main control MCU and a power supply module, a temperature acquisition module, a LoRa module, a pressure acquisition module, a voltage acquisition module, a current acquisition module, and a power control module respectively connected to the main control MCU. By real-time collecting various technical parameters such as the produced fluid temperature, pipeline pressure, outlet seal temperature, pipeline end temperature, radiation temperature, surface temperature of the heat tracing cable, voltage, and current as the control feedback indicators of the heat tracing system, and performing heat tracing control according to the oil viscosity-temperature characteristics. It can be seen that although the disclosed oilfield pipeline heat tracing control system discloses a technical solution for controlling the heat tracing system according to the collected technical parameters, there are the following problems: due to the changes in the crude oil temperature and the soil temperature around the buried pipeline, it is difficult to keep the heating and heat preservation effects of the oil at each position in the pipeline by the electric heat tracing device consistent, resulting in poor control accuracy of the oil temperature. Summary of the Invention

[0004] To this end, the present invention provides an anti-freezing self-regulating heat tracing cable to overcome the problem of poor control accuracy of the oil temperature caused by the inability of the heat tracing cable to perform corresponding control according to the heating and heat preservation effects of the oil in the actual working scenario in the prior art.

[0005] To achieve the above object, the present invention provides an anti-freezing self-regulating heat tracing cable, including:

[0006] A pipeline heat tracing unit, which is arranged on the surface of the target oil pipeline to provide heat energy for the target oil pipeline. The pipeline heat tracing unit includes a first heat tracing block and a second heat tracing block;

[0007] An information acquisition unit, which is connected to the target oil pipeline to collect demand data information;

[0008] A data analysis unit, which is connected to the pipeline tracing unit and the information acquisition unit, is used to determine the working mode of the pipeline tracing unit according to the reference oil quantity and increase the tracing temperature of the first tracing block when the reference oil quantity is in a preset threshold state;

[0009] A compensation adjustment unit, which is connected to the pipeline tracing unit, the information acquisition unit and the data analysis unit, is used to determine the adjustment method of the second tracing block according to the temperature adjustment effect parameter difference, including the method of adjusting the second tracing block corresponding to the post-course compensation pipeline and the method of uniformly adjusting the temperature of the second tracing block; the length of the post-course compensation pipeline is related to the initial oil temperature;

[0010] When the reference oil quantity is in the first preset reference oil quantity state or the temperature adjustment effect parameter is greater than or equal to the preset temperature adjustment effect parameter, the compensation adjustment unit determines whether to adjust the pipeline tracing unit according to the pipeline liquid flow rate; the length of the pre-course compensation pipeline is related to the difference in liquid flow rate stability;

[0011] Among them, the required data information includes the inlet-end oil temperature, the outlet-end oil temperature, the liquid flow rate of the oil, and the ambient temperature.

[0012] Further, the pipeline tracing unit includes:

[0013] A plurality of the first tracing blocks and a plurality of the second tracing blocks, and a single first tracing block and a single second tracing block are arranged at intervals on the surface of the target oil pipeline. The first tracing block and the second tracing block are tracing wires of the same material but different lengths;

[0014] A heat insulation layer, which is arranged on the outer surface of the target oil pipeline and covers the first tracing block and the second tracing block to block the heat loss of the target oil pipeline;

[0015] Among them, the heating length of the first tracing block for the target oil pipeline is greater than the heating length of the second tracing block for the target oil pipeline.

[0016] Further, the data analysis unit determines the working mode of the pipeline tracing unit according to the reference oil quantity under the first data analysis condition;

[0017] If the reference oil quantity is in the first preset reference oil quantity state, the data analysis unit determines that the pipeline tracing unit continuously adopts the first working mode;

[0018] If the reference oil quantity is in the second preset reference oil quantity state, the data analysis unit determines that the pipeline tracing unit adopts the second working mode;

[0019] The first working mode is that the heating temperatures of only the first heating block and the second heating block are the same; the second working mode is that the first heating block and the second heating block adopt sectional heating.

[0020] Among them, the first preset oil quantity reference state is that the oil temperature difference is less than the preset oil temperature difference and the oil temperature at the outlet end meets the standard; the second preset oil quantity reference state is that the oil temperature difference is greater than the preset oil temperature difference and / or the oil temperature at the outlet end does not meet the standard; the first data analysis condition is that the pipeline heating unit works for a preset duration in the first working mode.

[0021] Further, the data analysis unit increases and adjusts the heating temperature of the first heating block according to the oil temperature at the outlet end under the second data analysis condition.

[0022] The increase amount of the oil temperature at the outlet end and the heating temperature of the first heating block has a negative correlation.

[0023] Among them, the second data analysis condition is that the oil quantity reference is in the second preset oil quantity reference state.

[0024] Further, the data analysis unit determines whether to adjust the second heating block according to the temperature adjustment effect parameter under the third data analysis condition.

[0025] If the temperature adjustment effect parameter is greater than or equal to the preset temperature adjustment effect parameter, the data analysis unit determines that there is no need to adjust the second heating block.

[0026] If the temperature adjustment effect parameter is less than the preset temperature adjustment effect parameter, the data analysis unit determines to increase and adjust the heating temperature of the second heating block.

[0027] Among them, the third data analysis condition is that the increase adjustment of the heating temperature of the first heating block is completed and the operation duration of the pipeline heating unit reaches the preset response duration after the adjustment is completed.

[0028] Further, the compensation adjustment unit determines the adjustment method of the second heating block according to the temperature adjustment effect parameter difference under the first compensation adjustment condition.

[0029] If the temperature adjustment effect parameter difference is within the first preset effect parameter difference range, the compensation adjustment unit determines to increase and adjust the heating temperature of the second heating block corresponding to the later-stage compensation pipeline.

[0030] If the temperature adjustment effect parameter difference is within the second preset effect parameter difference range, the compensation adjustment unit determines to uniformly increase and adjust the temperature of the second heating block.

[0031] The increase in the tracing temperature of the second tracing block is positively correlated with the difference in the temperature regulation effect parameter;

[0032] Among them, the first compensation adjustment condition is that the temperature regulation effect parameter is less than the preset temperature regulation effect parameter.

[0033] Further, the compensation adjustment unit determines the length of the later-stage compensation pipeline according to the average initial temperature of the oil liquid under the second compensation adjustment condition,

[0034] The initial temperature of the oil liquid is negatively correlated with the length of the later-stage compensation pipeline;

[0035] Among them, the second compensation adjustment condition is that the difference in the temperature regulation effect parameter is within the first preset effect parameter difference range.

[0036] Further, the compensation adjustment unit detects the pipeline liquid flow rate under the third compensation adjustment condition and determines whether to adjust the pipeline tracing unit according to the pipeline liquid flow rate;

[0037] If the pipeline liquid flow rate is in the first pipeline liquid flow rate state, the compensation adjustment unit determines that there is no need to adjust the pipeline tracing unit;

[0038] If the pipeline liquid flow rate is in the second pipeline liquid flow rate state, the compensation adjustment unit determines to adjust the tracing temperature of the first tracing block corresponding to the front-stage compensation pipeline according to the difference in liquid flow rate stability;

[0039] Among them, the third compensation adjustment condition is that the oil liquid reference quantity is in the first preset oil liquid reference quantity state or the temperature regulation effect parameter is greater than or equal to the preset temperature regulation effect parameter, the first pipeline liquid flow rate state is that the liquid flow rate stability is greater than or equal to the preset liquid flow rate stability, and the second pipeline liquid flow rate state is that the liquid flow rate stability is less than the preset liquid flow rate stability.

[0040] Further, the compensation adjustment unit determines the length of the front-stage compensation pipeline according to the difference in liquid flow rate stability under the fourth compensation adjustment condition,

[0041] The length of the front-stage compensation pipeline is positively correlated with the difference in liquid flow rate stability;

[0042] Among them, the fourth compensation adjustment condition is that the pipeline liquid flow rate is in the second pipeline liquid flow rate state, the adjustment of the tracing temperature of the first tracing block corresponding to the front-stage compensation pipeline is an increasing adjustment, and the increase in the tracing temperature of the first tracing block is positively correlated with the difference in liquid flow rate stability.

[0043] Further, the first heat tracing module and the second heat tracing module are correspondingly provided with an activation temperature, and the activation temperature is related to the current ambient temperature.

[0044] Compared with the prior art, the beneficial effects of the present invention are as follows. In the present invention, the first heat tracing block and the second heat tracing block are used to realize the function of block heating and heat preservation for the target oil pipeline, and the problem of poor control accuracy of the oil temperature caused by unified heating and heat preservation in some prior arts is strongly eliminated. Moreover, in the present invention, the data analysis unit determines the working mode of the pipeline heat tracing unit according to the reference oil quantity, and selects the working mode of the pipeline heat tracing unit according to the actual working conditions, making the determination of the working mode more accurate. And in the first working mode, only the first heat tracing block operates, which reduces the energy consumption of the pipeline heat tracing unit while ensuring the heating and heat preservation effect of the oil. Additionally, in the present invention, the data analysis unit determines whether to adjust the second heat tracing block according to the temperature adjustment effect parameter under the third data analysis condition. Compared with the technical solution of unified adjustment of the heat tracing components, the adjustment accuracy of the present invention is higher.

[0045] Further, in the present invention, the data analysis unit increases the heat tracing temperature of the first heat tracing block according to the oil temperature at the outlet end under the second data analysis condition, avoiding the phenomenon of oil condensation caused by too low oil temperature, and further improving the heating and heat preservation effect of the oil and the pipeline in the present invention.

[0046] Further, in the present invention, when the difference value of the temperature adjustment effect parameter is within the first preset effect parameter difference range, the compensation adjustment unit increases the heat tracing temperature of the second heat tracing block corresponding to the post-process compensation pipeline, taking into account the influence of the initial oil temperature on the heat tracing effect and avoiding the problem of too high initial oil temperature caused by heating the oil at the inlet end, while ensuring the heating and heat preservation effect of the oil, improving the energy utilization rate of the pipeline heat tracing unit.

[0047] Further, in the present invention, if the pipeline liquid flow rate is in the second pipeline liquid flow rate state, the compensation adjustment unit determines whether to adjust the heat tracing temperature of the first heat tracing block corresponding to the pre-process compensation pipeline according to the liquid flow rate stability difference value, avoiding the problem of poor heat tracing effect of the heat tracing cable caused by the change of oil viscosity, and improving the oil transmission speed of the pipeline. Description of the Drawings

[0048] Figure 1 It is a connection diagram of unit components of the anti-freezing self-controlled temperature heat tracing cable in an embodiment of the present invention;

[0049] Figure 2 It is a schematic diagram of the pipeline heat tracing unit in an embodiment of the present invention;

[0050] Figure 3 It is a cross-sectional schematic diagram of the heat tracing wire in an embodiment of the present invention;

[0051] In the figure: 1 is the target oil pipeline; 2 is the tracing wire; 3 is the first tracing module; 4 is the second tracing module; 5 is the heating cable; 6 is the insulating protective layer; 7 is the low-halogen polyolefin sheath layer. Specific Embodiments

[0052] In order to make the objectives and advantages of the present invention more clearly understood, the present invention will be further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0053] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and do not limit the protection scope of the present invention.

[0054] It should be noted that in the description of the present invention, the terms indicating directions or positional relationships such as "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present invention.

[0055] In addition, it should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] Please refer to Figure 1 As shown, it is the connection diagram of the unit components of the anti-freezing self-controlled temperature tracing cable according to the embodiment of the present invention. The present invention provides an anti-freezing self-controlled temperature tracing cable, including:

[0057] A pipeline tracing unit, which is arranged on the surface of the target oil pipeline to provide heat energy for the target oil pipeline. The pipeline tracing unit includes a first tracing module and a second tracing module;

[0058] An information acquisition unit, which is connected to the target oil pipeline to collect demand data information;

[0059] A data analysis unit, which is connected to the pipeline tracing unit and the information acquisition unit, is used to determine the working mode of the pipeline tracing unit according to the reference oil quantity and increase the tracing temperature of the first tracing block when the reference oil quantity is in a preset threshold state;

[0060] A compensation adjustment unit, which is connected to the pipeline tracing unit, the information acquisition unit and the data analysis unit, is used to determine the adjustment method of the second tracing block according to the temperature adjustment effect parameter difference, including the adjustment method for the second tracing block corresponding to the later-stage compensation pipeline and the method for uniformly adjusting the temperature of the second tracing block; the length of the later-stage compensation pipeline is related to the initial oil temperature;

[0061] When the reference oil quantity is in the first preset reference oil quantity state or the temperature adjustment effect parameter is greater than or equal to the preset temperature adjustment effect parameter, the compensation adjustment unit determines whether to adjust the pipeline tracing unit according to the pipeline liquid flow rate; the length of the front-stage compensation pipeline is related to the difference in liquid flow rate stability;

[0062] Among them, the required data information includes the oil temperature at the inlet end, the oil temperature at the outlet end, the liquid flow rate of the oil, and the ambient temperature.

[0063] Specifically, the oil temperature at the inlet end is the oil temperature at the inlet of the target oil pipeline, the oil temperature at the outlet end is the oil temperature at the outlet of the target oil pipeline, and the oil temperature is detected by a temperature sensor.

[0064] Please refer to Figures 2 to 3 As shown, the pipeline tracing unit includes:

[0065] A number of the first tracing blocks 3 and a number of the second tracing blocks 4. A single first tracing block 3 and a single second tracing block 4 are arranged at intervals on the surface of the target oil pipeline 1. The first tracing block 3 and the second tracing block 4 are tracing wires 2 of the same material but different lengths;

[0066] A heat insulation layer (not shown), which is arranged on the outer surface of the target oil pipeline 1 and covers the first tracing block 3 and the second tracing block 4 to prevent heat loss of the target oil pipeline 1;

[0067] Among them, the heating length of the first tracing block 3 for the target oil pipeline 1 is greater than that of the second tracing block 4 for the target oil pipeline 1. Each first tracing block 3 and each second tracing block 4 are connected to a separately controlled switch component.

[0068] The tracing wire 2 includes two heating cables 5. The surface of a single heating cable 5 is covered with an insulating protective layer 6, and the two heating cables 5 are jointly covered with a low-halogen polyolefin sheath layer 7.

[0069] Please continue to refer to Figure 1 As shown, the data analysis unit determines the working mode of the pipeline heat tracing unit according to the oil fluid reference quantity under the first data analysis condition;

[0070] If the oil fluid reference quantity is in the first preset oil fluid reference quantity state, the data analysis unit determines that the pipeline heat tracing unit continuously adopts the first working mode;

[0071] If the oil fluid reference quantity is in the second preset oil fluid reference quantity state, the data analysis unit determines that the pipeline heat tracing unit adopts the second working mode;

[0072] The first working mode is that only the heat tracing temperatures of the first heat tracing block and the second heat tracing block are the same; the second working mode is that the first heat tracing block and the second heat tracing block adopt segmented heat tracing;

[0073] Among them, the first preset oil fluid reference quantity state is that the oil fluid temperature difference is less than the preset oil fluid temperature difference and the oil fluid temperature at the outlet end meets the standard, the second preset oil fluid reference quantity state is that the oil fluid temperature difference is greater than the preset oil fluid temperature difference and / or the oil fluid temperature at the outlet end does not meet the standard, the first data analysis condition is that the pipeline heat tracing unit works for a preset duration in the first working mode. When the pipeline heat tracing unit is started and operated, the first working mode is used. When the working duration in the first working mode reaches the working preset duration, the data analysis unit re-determines the working mode of the pipeline heat tracing unit according to the oil fluid reference quantity under the first data analysis condition, so as to ensure that the working mode of the pipeline heat tracing unit is more in line with the actual application scenario.

[0074] Specifically, the oil fluid temperature difference is the difference obtained by subtracting the oil fluid temperature at the outlet end from the oil fluid temperature at the inlet end. For the value of the preset oil fluid temperature difference, the user can detect the viscosity of the oil fluid at different temperatures and record the temperature corresponding to the oil fluid with the viscosity meeting the user's requirements as the required temperature. The preset oil fluid temperature difference is the difference obtained by subtracting the required temperature from the oil fluid temperature at the inlet end. If the oil fluid temperature difference is less than 0, the data analysis unit determines that the pipeline temperature is too high and transmits the determination information to the user to remind to control and reduce the temperature of the pipeline heat tracing unit. A device for measuring the viscosity of the oil fluid is provided. A rotational viscometer is used to measure the viscosity of the oil fluid. The rotational viscometer stirs the oil fluid by rotating the measurer and measures the required torque or rotational speed to determine the viscosity. The viscosity unit is mPa·s; the working preset duration can be set by the user according to the actual application scenario, which is easy to understand for those skilled in the art and will not be elaborated here.

[0075] Specifically, the data analysis unit increases and adjusts the heat tracing temperature of the first heat tracing block according to the oil fluid temperature at the outlet end under the second data analysis condition;

[0076] The increase in the oil temperature at the outlet end is negatively correlated with the increase in the heating temperature of the first heating module;

[0077] Wherein, the second data analysis condition is that the reference oil quantity is in the second preset reference oil quantity state.

[0078] Specifically, the data analysis unit determines whether to adjust the second heating module according to the temperature adjustment effect parameter under the third data analysis condition;

[0079] If the temperature adjustment effect parameter is greater than or equal to the preset temperature adjustment effect parameter, the data analysis unit determines that there is no need to adjust the second heating module;

[0080] If the temperature adjustment effect parameter is less than the preset temperature adjustment effect parameter, the data analysis unit determines to increase the heating temperature of the second heating module;

[0081] Wherein, the third data analysis condition is that the increase adjustment of the heating temperature of the first heating module is completed and the operation duration of the pipeline heating unit reaches the preset response duration after the adjustment is completed.

[0082] Specifically, the preset response duration can be determined by the user through experiments, that is, an oil sample at the inlet end is obtained, the oil samples at different temperatures are heated up, and the average value of the sum of the heating durations corresponding to when the viscosity of the oil meets the viscosity requirement of the user is recorded as the preset response duration. The temperature adjustment effect parameter is the change in the oil temperature at the outlet end within a single adjustment monitoring period, and the change is an absolute value. The value of the preset temperature adjustment effect parameter is 60% of the oil temperature difference.

[0083] Specifically, the compensation adjustment unit determines the adjustment method of the second heating module according to the difference in the temperature adjustment effect parameter under the first compensation adjustment condition;

[0084] If the difference in the temperature adjustment effect parameter is within the first preset effect parameter difference range, the compensation adjustment unit determines to increase the heating temperature of the second heating module corresponding to the subsequent compensation pipeline;

[0085] If the difference in the temperature adjustment effect parameter is within the second preset effect parameter difference range, the compensation adjustment unit determines to uniformly increase the temperature of the second heating module;

[0086] The increase in the heating temperature of the second heating module is positively correlated with the difference in the temperature adjustment effect parameter;

[0087] Wherein, the first compensation adjustment condition is that the temperature adjustment effect parameter is less than the preset temperature adjustment effect parameter.

[0088] Specifically, the difference in the temperature adjustment effect parameter is the value obtained by subtracting the temperature adjustment effect parameter from the preset temperature adjustment effect parameter. The values within the first preset effect parameter difference range are all less than or equal to 30% of the oil temperature difference, and the values within the second preset effect parameter difference range are all greater than 30% of the oil temperature difference.

[0089] Specifically, the compensation adjustment unit determines the length of the subsequent compensation pipeline according to the average initial oil temperature under the second compensation adjustment condition.

[0090] There is a negative correlation between the initial oil temperature and the length of the subsequent compensation pipeline.

[0091] Among them, the second compensation adjustment condition is that the difference in the temperature adjustment effect parameter is within the first preset effect parameter difference range.

[0092] Specifically, the part of the target oil pipeline with a corresponding length starting from the outlet end is denoted as the subsequent compensation pipeline. The average initial oil temperature is the average of the oil temperatures detected at the outlet end during the temperature monitoring period. The information acquisition unit detects the oil temperature at the outlet end N times within a single temperature monitoring period. The average of the oil temperatures at the outlet end is the average of the sum of the N oil temperatures at the outlet end within a single temperature monitoring period. The values of the temperature monitoring period and N can be set by the user according to the actual working scenario. The larger the number of N, the more accurate the average of the oil temperatures at the outlet end represents the oil temperature at the outlet end.

[0093] Specifically, the compensation adjustment unit detects the pipeline liquid flow rate under the third compensation adjustment condition and determines whether to adjust the pipeline heat tracing unit according to the pipeline liquid flow rate.

[0094] If the pipeline liquid flow rate is in the first pipeline liquid flow rate state, the compensation adjustment unit determines that there is no need to adjust the pipeline heat tracing unit.

[0095] If the pipeline liquid flow rate is in the second pipeline liquid flow rate state, the compensation adjustment unit determines whether to adjust the heat tracing temperature of the first heat tracing block corresponding to the forward compensation pipeline according to the pipeline pressure.

[0096] Among them, the third compensation adjustment condition is that the oil reference quantity is in the first preset oil reference quantity state or the temperature adjustment effect parameter is greater than or equal to the preset temperature adjustment effect parameter. The first pipeline liquid flow rate state is that the liquid flow rate stability is greater than or equal to the preset liquid flow rate stability, and the second pipeline liquid flow rate state is that the liquid flow rate stability is less than the preset liquid flow rate stability.

[0097] Specifically, the information acquisition unit detects the pipeline liquid flow rate every 10 minutes, and records the absolute value of the difference between the currently detected pipeline liquid flow rate and the pipeline liquid flow rate detected most recently as the pipeline flow rate stability. If the difference between the currently detected pipeline liquid flow rate and the pipeline liquid flow rate detected most recently is greater than 0, there is no need to adjust the heating temperature of the first heating block. The preset liquid flow rate stability is 10% of the pipeline liquid flow rate detected most recently. Due to the non-fixed viscosity of the oil liquid at the inlet end, the heating temperature of the first heating block corresponding to the forward compensation pipeline is adjusted according to the liquid flow rate stability, so as to avoid the excessive viscosity of the oil liquid affecting the oil liquid flow rate.

[0098] Specifically, the compensation adjustment unit determines the length of the forward compensation pipeline according to the liquid flow rate stability difference under the fourth compensation adjustment condition.

[0099] The length of the forward compensation pipeline has a positive correlation with the liquid flow rate stability difference.

[0100] Among them, the fourth compensation adjustment condition is that the pipeline liquid flow rate is in the second pipeline liquid flow rate state. The adjustment of the heating temperature of the first heating block corresponding to the forward compensation pipeline is an increase adjustment. The increase amount of the heating temperature of the first heating block has a positive correlation with the liquid flow rate stability difference. The liquid flow rate stability difference is the absolute value of the difference between the liquid flow rate stability and the preset liquid flow rate stability. The first heating block corresponding to the forward compensation pipeline is the complete first heating block on the forward compensation pipeline. The complete first heating block means that the entire first heating block is located on the forward compensation pipeline. The second heating block corresponding to the rearward compensation pipeline is the complete second heating block on the rearward compensation pipeline.

[0101] Specifically, the part of the target oil pipeline with a corresponding length starting from the inlet end is recorded as the forward compensation pipeline. The first heating module and the second heating module are respectively provided with an opening temperature, and the opening temperature is related to the current ambient temperature.

[0102] So far, the technical solution of the present invention has been described in combination with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of the present invention.

[0103] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention; for those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An anti-freezing self-controlled temperature tracing cable, characterized in that, Comprising: A pipeline tracing unit, which is arranged on the surface of the target oil pipeline to provide heat energy for the target oil pipeline. The pipeline tracing unit includes a first tracing block and a second tracing block; An information acquisition unit, which is connected to the target oil pipeline to collect demand data information; A data analysis unit, which is connected to the pipeline tracing unit and the information acquisition unit to determine the working mode of the pipeline tracing unit according to the reference oil volume and increase the tracing temperature of the first tracing block when the reference oil volume is in a preset threshold state; A compensation adjustment unit, which is connected to the pipeline tracing unit, the information acquisition unit and the data analysis unit to determine the adjustment method of the second tracing block according to the temperature adjustment effect parameter difference, including the method of adjusting the second tracing block corresponding to the post-course compensation pipeline and the method of uniformly adjusting the temperature of the second tracing block; the length of the post-course compensation pipeline is related to the initial oil temperature; When the reference oil volume is in the first preset reference oil volume state or the temperature adjustment effect parameter is greater than or equal to the preset temperature adjustment effect parameter, the compensation adjustment unit determines whether to adjust the first tracing block corresponding to the pre-course compensation pipeline of the pipeline tracing unit according to the pipeline liquid flow rate; the length of the pre-course compensation pipeline is related to the difference in liquid flow rate stability; Wherein, the demand data information includes the inlet-end oil temperature, the outlet-end oil temperature, the liquid flow rate of the oil and the ambient temperature.

2. The self-controlled temperature tracing heating cable for freeze protection according to claim 1, wherein, The pipeline tracing unit includes: A plurality of the first tracing blocks and a plurality of the second tracing blocks. A single first tracing block and a single second tracing block are arranged at intervals on the surface of the target oil pipeline. The first tracing block and the second tracing block are tracing wires with the same material but different lengths; A heat insulation layer, which is arranged on the outer surface of the target oil pipeline and covers the first tracing block and the second tracing block to block the heat loss of the target oil pipeline; Wherein, the heating length of the first tracing block for the target oil pipeline is greater than the heating length of the second tracing block for the target oil pipeline.

3. The self-controlled temperature tracing heating cable for freeze protection according to claim 2, wherein, The data analysis unit determines the working mode of the pipeline tracing unit according to the reference oil volume under the first data analysis condition; If the reference oil volume is in the first preset reference oil volume state, the data analysis unit determines that the pipeline tracing unit continuously adopts the first working mode; If the reference oil volume is in the second preset reference oil volume state, the data analysis unit determines that the pipeline tracing unit adopts the second working mode; The first working mode is that only the tracing temperatures of the first tracing block and the second tracing block are the same; the second working mode is that the first tracing block and the second tracing block adopt block-by-block tracing; Wherein, the first preset reference oil volume state is that the oil temperature difference is less than the preset oil temperature difference and the outlet-end oil temperature meets the standard, the second preset reference oil volume state is that the oil temperature difference is greater than the preset oil temperature difference and / or the outlet-end oil temperature does not meet the standard, and the first data analysis condition is that the pipeline tracing unit works in the first working mode for a preset duration.

4. The self-regulating heating cable with anti-freezing function according to claim 3, characterized in that, The data analysis unit increases the heating temperature of the first heating module according to the oil temperature at the outlet under the second data analysis condition; The increase in the oil temperature at the outlet and the heating temperature of the first heating module has a negative correlation; Among them, the second data analysis condition is that the oil reference quantity is in the second preset oil reference quantity state.

5. The self-regulating heating cable with anti-freezing function according to claim 4, characterized in that, The data analysis unit determines whether to adjust the second heating module according to the temperature adjustment effect parameter under the third data analysis condition; If the temperature adjustment effect parameter is greater than or equal to the preset temperature adjustment effect parameter, the data analysis unit determines that there is no need to adjust the second heating module; If the temperature adjustment effect parameter is less than the preset temperature adjustment effect parameter, the data analysis unit determines to increase the heating temperature of the second heating module; Among them, the third data analysis condition is that the increase adjustment of the heating temperature of the first heating module is completed and the operation time of the pipeline heating unit reaches the preset response time after the adjustment is completed.

6. The self-regulating heating cable with anti-freezing function according to claim 5, characterized in that, The compensation adjustment unit determines the adjustment method of the second heating module according to the temperature adjustment effect parameter difference under the first compensation adjustment condition; If the temperature adjustment effect parameter difference is within the first preset effect parameter difference range, the compensation adjustment unit determines to increase the heating temperature of the second heating module corresponding to the subsequent compensation pipeline; If the temperature adjustment effect parameter difference is within the second preset effect parameter difference range, the compensation adjustment unit determines to uniformly increase the temperature of the second heating module; The increase in the heating temperature of the second heating module has a positive correlation with the temperature adjustment effect parameter difference; Among them, the first compensation adjustment condition is that the temperature adjustment effect parameter is less than the preset temperature adjustment effect parameter.

7. The self-regulating heating cable with anti-freezing function according to claim 6, characterized in that, The compensation adjustment unit determines the length of the subsequent compensation pipeline according to the average initial oil temperature under the second compensation adjustment condition, The initial oil temperature and the length of the subsequent compensation pipeline have a negative correlation; Among them, the second compensation adjustment condition is that the temperature adjustment effect parameter difference is within the first preset effect parameter difference range.

8. The self-controlled temperature tracing heating cable for anti-freezing according to claim 7, wherein The compensation adjustment unit detects the pipeline liquid flow rate and determines whether to adjust the pipeline heating unit according to the pipeline liquid flow rate under the third compensation adjustment condition; If the pipeline liquid flow rate is in the first pipeline liquid flow rate state, the compensation adjustment unit determines that there is no need to adjust the pipeline heating unit; If the pipeline liquid flow rate is in the second pipeline liquid flow rate state, the compensation adjustment unit determines to adjust the heating temperature of the first heating module corresponding to the previous compensation pipeline according to the liquid flow rate stability difference; Among them, the third compensation adjustment condition is that the oil reference quantity is in the first preset oil reference quantity state or the temperature adjustment effect parameter is greater than or equal to the preset temperature adjustment effect parameter, the first pipeline liquid flow rate state is that the liquid flow rate stability is greater than or equal to the preset liquid flow rate stability, and the second pipeline liquid flow rate state is that the liquid flow rate stability is less than the preset liquid flow rate stability.

9. The self-regulating heating cable with anti-freezing function according to claim 8, characterized in that, The compensation adjustment unit determines the length of the previous compensation pipeline according to the liquid flow rate stability difference under the fourth compensation adjustment condition, The length of the forward compensation pipeline is positively correlated with the difference in the liquid flow rate stability; Among them, the fourth compensation adjustment condition is that the pipeline liquid flow rate is in the second pipeline liquid flow rate state, and the adjustment of the heating temperature of the first heat tracing block corresponding to the forward compensation pipeline is an increase adjustment, and the increase amount of the heating temperature of the first heat tracing block is positively correlated with the difference in the liquid flow rate stability.

10. The self-regulating heating cable with anti-freezing function according to claim 9, characterized in that, The first heat tracing module and the second heat tracing module are correspondingly provided with an opening temperature, and the opening temperature is related to the current ambient temperature.

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