A constant temperature control system used in port water pipelines

Abstract

The present invention relates to the field of temperature control technology, and in particular to a constant temperature control system applied to a port water pipeline, comprising a power supply, a monitoring and detection module, a preliminary processing module, a data processing module and an alarm unit. The power supply provides power to the electric heating belt; the monitoring and detection unit obtains the ambient temperature and the initial temperature of the target water pipeline and the actual temperature during the heating process; the preliminary processing module determines the target temperature range and the target heating time according to the current actual ambient temperature; the data processing module determines the temperature control mode according to the actual ambient temperature and the target temperature range, and adjusts and corrects the initial power of the electric heating belt according to the volatility of the ambient temperature and the initial detection temperature to obtain the actual power; the alarm unit receives the instruction of the electric heating unit and sends an alarm signal; the present invention sets different temperature control adjustment modes by detecting the calculation results, so as to realize the precise automatic control and adjustment of the temperature of the target water pipeline.

Description

Technical Field

[0001] The present invention relates to the technical field of temperature control, and in particular to a constant temperature control system applied to a port water pipeline. Background Art

[0002] Temperature control of the port water pipeline is an important technical issue because it directly affects the production safety and efficiency of the port. In the actual production process, the water pipeline often freezes and cracks, affecting the water supply. Electric heating, as an effective pipeline insulation and antifreeze solution, has been widely used in industry, construction and civil fields. Its working principle is to emit a certain amount of heat through the heating medium, and supplement the loss of the heated pipeline through direct or indirect heat exchange to achieve the normal working requirements of heating, insulation or antifreeze. As a high-tech product, electric heating has high thermal efficiency, small temperature gradient, long thermal stability time, suitable for long-term use, the required heat is much lower than electric heating, energy saving, simple design, convenient construction and installation, environmental protection and pollution-free, long service life, remote control and automatic control, etc. It is the technical development direction to replace steam and hot water heating.

[0003] Chinese patent announcement number: CN202469349U discloses an electric heating structure for a long-distance target water pipeline in a port. The system includes: multiple sections of electric heating tapes fixed on the outer wall of the water pipeline by fixing parts, a temperature sensor installed on the outer wall of the water pipeline at a certain interval, and an insulation layer and an outer protective layer wrapped in sequence outside the electric heating tape of the outer wall of the water pipeline. The head ends of the electric heating tapes of every 4-6 sections of the electric heating tapes are each connected to a heating control box through a power line, and each temperature sensor is connected to the heating control box of the corresponding section of the electric heating tape. In the humid environment of the port, the pipeline can be protected from freezing and work normally for a long time.

[0004] It can be seen that the electric heating structure of the long-distance target water pipeline in the port has the following problems: the temperature control method applied to the port water pipeline under the existing technology has a low degree of automation in temperature control and power regulation. During operation, it is necessary to manually observe the temperature instrument and adjust the heating power of the device according to the instrument reading. This method is not only time-consuming and labor-intensive, but also manual adjustment is often limited by the operator's ability, and high-precision continuous control cannot be achieved. It may cause fluctuations in product quality and affect the overall production efficiency and economic benefits. Summary of the invention

[0005] To this end, the present invention provides a constant temperature control system applied to a port water pipeline, so as to overcome the problem that the temperature control method applied to the port water pipeline in the prior art has a low degree of automation in temperature control and power regulation, and cannot achieve high-precision continuous control.

[0006] To achieve the above object, the present invention provides a constant temperature control system applied to a port water pipeline, comprising:

[0007] A power source for providing power to the target electric heating cable;

[0008] an alarm unit connected to the data processor and configured to send out an alarm signal;

[0009] A monitoring and detection module detects the ambient temperature in a preset initial acquisition cycle to obtain the current actual ambient temperature and the historical actual ambient temperature, and obtains the initial temperature of the target water pipeline and obtains several actual temperatures during the heating process of the target water pipeline by the electric heating tape, wherein the monitoring and detection module includes a first temperature sensor and a second temperature sensor;

[0010] A preliminary processing module, which is used to obtain the current actual ambient temperature and determine a target temperature range and a target heating time according to the current actual ambient temperature;

[0011] A data processing module, comprising a data processor and a temperature controller, for determining a temperature control mode for the target water pipeline according to the current actual ambient temperature and the target temperature range, wherein the temperature control mode is divided into a linear heating mode and a constant temperature adjustment mode; based on different temperature control modes, the initial power of the electric heating tape is determined according to the current actual ambient temperature and the historical actual ambient temperature, and the initial power is corrected according to the initial temperature and the target temperature range to obtain the actual power; in the linear heating mode, the temperature controller gradually increases the power of the electric heating tape at a linear rate, and pre-adjusts the initial parameters of the linear rate according to the influence of the power of the electric heating tape on the temperature of the water pipeline; in the constant temperature adjustment mode, the temperature controller increases the temperature of the target water pipeline to the target temperature range at a fixed power, and adjusts the parameters to stabilize the temperature of the target water pipeline within the target temperature range;

[0012] The upper limit of the target temperature range is the maximum value of the target temperature, and the lower limit is the minimum value of the target temperature.

[0013] The first temperature sensor is used to detect the ambient temperature, and the second temperature sensor is used to detect the temperature of the target water pipeline.

[0014] Furthermore, the first temperature sensor detects the current actual ambient temperature in real time and transmits the detection data to the data processor, the data processor calculates a target temperature difference evaluation value according to the actual ambient temperature and the minimum target temperature value, and determines the temperature control mode according to the target temperature difference evaluation value.

[0015] If the target temperature difference evaluation value is greater than the temperature difference level evaluation value, the data processor determines that the temperature control mode is a linear heating mode;

[0016] If the target temperature difference evaluation value is less than or equal to the temperature difference level evaluation value, the data processor determines that the temperature control mode is a constant temperature control mode;

[0017] Wherein, the temperature difference level evaluation value is a preset value.

[0018] Furthermore, the monitoring and detection unit is provided with an initial detection cycle, and the first temperature sensor detects the current actual ambient temperature in real time according to the initial detection cycle. For any current actual ambient temperature, the data processor calculates an ambient temperature difference evaluation value between the current actual ambient temperature and the historical actual ambient temperature, and determines the fluctuation of the current actual ambient temperature.

[0019] If any current actual ambient temperature is less than the historical actual ambient temperature detected in the previous detection cycle, the data processor determines that the ambient temperature is decreasing in the current detection cycle, and determines the initial power of the electric heating cable according to the fluctuation of the ambient temperature;

[0020] If any current actual ambient temperature is greater than or equal to the historical actual ambient temperature detected in the previous detection cycle, the data processor determines that the ambient temperature is rising in the current detection cycle.

[0021] Furthermore, the second temperature sensor detects the initial temperature value of the target water pipeline and transmits the detected data information to the data processor. The data processor adjusts the initial power of the electric heating tape according to the ratio of the initial temperature of the target water pipeline to the target temperature range and the fluctuation of the current actual ambient temperature. The adjusted electric heating tape power is the actual power.

[0022] Furthermore, in the constant temperature adjustment mode,

[0023] The temperature controller controls the electric heating tape to heat the target water pipeline with the actual power, the second temperature sensor detects the temperature of the target water pipeline in real time, and transmits the detection result to the data processor, and the data processor determines that the target water pipeline temperature is within the target temperature range when the target temperature minimum value is less than or equal to the target water pipeline temperature.

[0024] The data processor draws a temperature change curve of the target water pipeline according to the target water pipeline temperature, obtains a derivative function of the temperature change curve, and compares the target water pipeline temperature with the target temperature range.

[0025] If the target water pipeline temperature at any time point of the temperature change curve is between the target temperature minimum value and the target temperature middle value, the data processor determines that the target water pipeline temperature is low within the target temperature range, and makes a low temperature risk determination on the target water pipeline temperature according to the temperature change trend;

[0026] If the target water pipeline temperature of the temperature change curve is between the target temperature maximum value and the target temperature middle value at any time point, the data processor determines that the target water pipeline temperature is too high within the target temperature range, and makes a high temperature risk assessment on the target water pipeline temperature based on the temperature change trend.

[0027] Further, the target water pipeline temperature is subjected to risk assessment according to the temperature change trend of the temperature change curve, and the temperature expression parameter of the temperature change curve is determined according to the temperature risk level of the target water pipeline, wherein:

[0028] When the temperature of the target water pipeline is low, if the derivative value of the temperature change curve is less than zero, the data processor determines that the temperature of the target water pipeline is decreasing, the target water pipeline is at risk of being lower than the target temperature range, and is at the first temperature risk level, and the temperature expression parameter of the temperature change curve is equal to the first temperature expression parameter;

[0029] When the temperature of the target water pipeline is high, if the derivative value of the temperature change curve is greater than zero, the data processor determines that the temperature of the target water pipeline is rising, the target water pipeline is at risk of exceeding the target temperature range, and is at the second temperature risk level, and the temperature expression parameter of the temperature change curve is equal to the second temperature expression parameter;

[0030] If the derivative value of the temperature change curve is equal to zero, it is determined that the target water pipeline temperature remains stable, and the data processor controls the temperature controller to maintain the current power of the electric heating tape;

[0031] Among them, the first preset value of the temperature expression parameter is greater than the second preset value of the temperature expression parameter.

[0032] Furthermore, in the linear heating mode,

[0033] The temperature controller controls the power of the electric heating belt to increase linearly with initial linear parameters during the heating process. The initial linear parameters include the number of linear increase nodes and the power increase coefficient. The data processor determines the number of linear increase nodes and the power increase coefficient according to the heating time of the target water pipeline. When the second temperature sensor detects that the actual temperature of the target water pipeline reaches the target temperature range, the data processor controls the temperature controller to reduce the power of the electric heating belt or stop heating.

[0034] Wherein, the data processor estimates the heating time of the target water pipeline according to the actual power of the electric heating belt.

[0035] Furthermore, the second temperature sensor detects the temperature of the target water pipeline in real time and transmits the detection data to the data processor, and the data processor estimates the maximum temperature of the target water pipeline under the influence of the residual heat of the electric heating tape after reducing the power of the electric heating tape.

[0036] The data processor compares the maximum temperature with the target maximum temperature. If the maximum temperature is greater than the target maximum temperature, it is determined that the temperature of the target water pipeline exceeds the target temperature range due to the influence of the residual heat of the electric heating tape. The data processor pre-adjusts the power of the electric heating tape. The pre-adjustment is divided into a first-level pre-adjustment mode and a second-level pre-adjustment mode.

[0037] Furthermore, in the first-level pre-regulation mode, the data processor reduces the power gain coefficient of the electric heating belt, and the data processor calculates the reduced power gain coefficient of the electric heating belt according to the ratio of the maximum temperature of the target water pipeline to the maximum temperature of the target;

[0038] In the secondary pre-regulation mode, the data processor reduces the number of linear increase nodes of the electric heating tape power, and the data processor calculates the reduced number of linear increase nodes of the electric heating tape power based on the ratio of the maximum temperature of the target water pipeline to the maximum target temperature.

[0039] Furthermore, the data processor calculates the theoretical maximum temperature of the target water pipeline when the electric heating belt reaches the maximum power, and compares the theoretical maximum temperature with the target minimum temperature.

[0040] If the maximum theoretical temperature is greater than or equal to the minimum target temperature, it is determined that the electric heating tape can meet the heating demand of the target water pipeline at the maximum power;

[0041] If the maximum theoretical temperature is less than the minimum target temperature, it is determined that the electric heating tape cannot meet the heating demand of the target water pipeline, and the data processor controls the alarm unit to send out an alarm signal.

[0042] Compared with the prior art, the beneficial effect of the present invention lies in that, for different temperature control application scenarios, the target water pipeline requires different temperature control methods. The temperature control mode is divided into a linear heating mode and a constant temperature adjustment mode, and the temperature control mode is determined according to the difference between the ambient temperature and the target temperature, thereby increasing the practicality of the present invention; and the initial power of the electric heating tape is jointly adjusted according to the volatility of the ambient temperature and the ratio of the target temperature range to the initial temperature of the target water pipeline, thereby increasing the accuracy of predicting the target water pipeline temperature.

[0043] Furthermore, in the constant temperature adjustment mode, the temperature change trend of the target water pipeline is judged according to the derivative function of the temperature change curve, the temperature risk level is evaluated, and different temperature expression parameters are set, thereby increasing the accuracy of the prediction of the target water pipeline temperature.

[0044] Furthermore, in the linear heating mode, the temperature controller linearly increases the power of the electric heating tape with the initial linear parameters, and increases the heating temperature of the target water pipeline by increasing the power of the electric heating tape, thereby reducing the heating time for the target water pipeline temperature to reach the target temperature range, thereby improving the temperature heating efficiency of the present invention for heating the target water pipeline.

[0045] Furthermore, when the temperature of the target water pipeline reaches the target temperature range, the temperature controller controls the electric heating tape to start reducing power and stop heating, but the temperature of the electric heating tape will not decrease immediately as the power decreases, and the target water pipeline is still in a heating state under the residual heat of the electric heating tape. The target water pipeline temperature continues to rise, and there is a risk that the target water pipeline temperature exceeds the target temperature range. The data processor compares the maximum value of the target water pipeline temperature after the power of the electric heating tape is reduced with the maximum value of the target temperature to determine whether the target water pipeline temperature exceeds the target temperature range under the said circumstances, and pre-adjusts the power of the electric heating tape according to the comparison result, thereby saving electric energy and improving the accuracy of controlling and adjusting the target water pipeline temperature.

[0046] Furthermore, if the theoretical maximum temperature of the target water pipeline is not calculated, it is impossible to accurately determine whether the electric heating tape can meet the target temperature range requirements set by the user, thereby affecting the subsequent heating and insulation process of the target water pipeline. The electric heating unit quantifies the heating capacity of the electric heating tape by calculating the theoretical maximum temperature of the target water pipeline when the power of the electric heating tape reaches its maximum value, thereby improving the accuracy of heating and insulation of the target water pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is a connection diagram of a constant temperature control system applied to a port water pipeline in an embodiment of the present invention;

[0048] Figure 2 It is a schematic diagram of the cross-sectional structure of the electric heating belt and the target water pipeline in an embodiment of the present invention;

[0049] Figure 3 A flow chart of selecting a pre-adjustment mode for a constant temperature control system according to an embodiment of the present invention;

[0050] Figure 4 A flow chart of selecting a temperature control mode for a constant temperature control system according to an embodiment of the present invention;

[0051] Figure 5 This is a technical effect flow chart of a constant temperature control system applied to a port water pipeline in an embodiment of the present invention;

[0052] In the figure: 1- electric heating tape, 2- target water pipeline. DETAILED DESCRIPTION

[0053] In order to make the objects and advantages of the present invention more clearly understood, the present invention is 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.

[0054] The 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 only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0055] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the 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. Therefore, it cannot be understood as a limitation on the present invention.

[0056] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] See also Figure 1-Figure 5 As shown, Figure 1 This is a connection diagram of a constant temperature control system applied to a port water pipeline in an embodiment of the present invention. Figure 2 It is a schematic diagram of the cross-sectional structure of the electric heating belt and the target water pipeline in an embodiment of the present invention. Figure 3 This is a flow chart of selecting a pre-adjustment mode for a constant temperature control system according to an embodiment of the present invention. Figure 4 A flow chart of selecting a temperature control mode for a constant temperature control system according to an embodiment of the present invention; Figure 5 It is a flow chart of the technical effects of a constant temperature control system applied to a port water pipeline in an embodiment of the present invention.

[0058] The present invention provides a constant temperature control system applied to a port water pipeline, comprising:

[0059] A power supply, used for providing power to the target electric heating cable 1;

[0060] A monitoring and detection module detects the ambient temperature with a preset initial acquisition cycle to obtain the current actual ambient temperature and the historical actual ambient temperature, and obtains the initial temperature of the target water pipeline 2 and obtains several actual detection temperatures during the heating process of the electric heating belt 1 on the target water pipeline 2. The monitoring and detection module includes several temperature sensors;

[0061] A preliminary processing module, which is used to obtain the current actual ambient temperature and determine the target temperature range and target heating time according to the current actual ambient temperature;

[0062] A data processing module, which includes a data processor and a temperature controller, is used to determine the temperature control mode of the target water pipeline 2 according to the current actual ambient temperature and the target temperature range, and the temperature control mode is divided into a linear heating mode and a constant temperature adjustment mode; based on different temperature control modes, the initial power of the electric heating belt 1 is determined according to the current actual ambient temperature, the historical actual ambient temperature and the target temperature range, and the initial power is corrected according to the initial detection temperature to obtain the actual power;

[0063] An alarm unit is connected to the data processor and is used to send out an alarm signal.

[0064] Wherein, the temperature control mode includes a linear heating mode and a constant temperature adjustment mode. When the temperature control mode is the linear heating mode, the target temperature range is taken as the target, and the temperature controller gradually increases the power of the electric heating belt 1 at a linear rate, and increases the temperature of the target water pipeline 2 to the target temperature range; when the temperature control mode is the constant temperature adjustment mode, the target temperature range is taken as the target, and the temperature controller increases the temperature of the target water pipeline 2 to the target temperature range with a fixed power, and adjusts the parameters to stabilize the temperature of the target water pipeline 2 within the target temperature range;

[0065] The electric heating tape 1 is fixed to the outside of the target water pipeline 2 .

[0066] Specifically, in this embodiment, the target temperature range is Ce1~Ce2, the target heating time is te, and the ambient temperature is Cr, where Ce1 is the minimum target temperature and Ce2 is the maximum target temperature.

[0067] The first temperature sensor detects the current actual ambient temperature Cr in real time and transmits the detection data to the preliminary processing module. The preliminary processing module determines the target temperature range Ce1-Ce2 and the target heating time te according to the current actual ambient temperature Cr.

[0068] Among them, the target temperature minimum value Ce1=Cr+Ca, the target temperature maximum value Ce2=Ce1+Cb, Ca is a preset safety margin parameter, which is used to control the target temperature minimum value Ce1 of the target water pipeline 2 to be higher than the actual ambient temperature Cr to prevent the water in the water pipe from freezing, and Cb is a preset standard range parameter, which is used to control the target temperature maximum value Ce2 to be lower than the thermal damage temperature caused by the water temperature, while considering energy consumption and cost-effectiveness, generally not exceeding 60°C to avoid damage to the water pipe and water quality.

[0069] The target heating time te=Cr÷k×t0, wherein k is a preset temperature coefficient and t0 is a preset reference heating time, which is used to adjust the target heating time te according to the actual ambient temperature Cr.

[0070] The first temperature sensor detects the current actual ambient temperature Cr in real time and transmits the detection data to the data processor. The data processor calculates the target temperature difference evaluation value Sa according to the actual ambient temperature Cr and the target temperature minimum value Ce1, Sa=|Ce1-Cr|, judges the size of the target temperature difference, and determines the temperature control mode according to the judgment result.

[0071] In this embodiment, the current actual ambient temperature Cr is less than the target temperature minimum value Ce1;

[0072] If Sa>Sa0, the data processor determines that the temperature difference between the actual ambient temperature and the target temperature range is large, and determines that the temperature control mode is a linear heating mode;

[0073] If Sa≤Sa0, the data processor determines that the temperature difference between the actual ambient temperature and the target temperature range is small, and determines that the temperature control mode is the constant temperature control mode.

[0074] Among them, Sa0 is the preset temperature difference level evaluation value.

[0075] Specifically, the monitoring detection unit is provided with an initial detection cycle T0, and the first temperature sensor detects the ambient temperature Cr in real time according to the initial detection cycle T0. For any current ambient temperature Cri, i=1, 2, ..., n, the data processor calculates the ambient temperature difference evaluation value Si between the current ambient temperature Cri and the historical ambient temperature Cr(i-1) detected in the previous detection cycle, Si=Cri-Cr(i-1), and determines the fluctuation of the ambient temperature.

[0076] If Si ≥ 0, the data processor determines that the ambient temperature is increasing during the current detection cycle, and the impact on the target water delivery pipeline 2 is relatively low;

[0077] If Si<0, the data processor determines that the ambient temperature is decreasing in the current detection cycle, and the impact on the target water pipeline 2 is relatively high. The data processor determines the initial power P0 of the electric heating belt 1 according to the fluctuation of the ambient temperature, P0=Pa-J×Si, where J is the preset temperature fluctuation coefficient, and Pa is the preset reference power, which is used to determine the initial power P0 of the electric heating belt 1 according to the fluctuation of the ambient temperature;

[0078] The second temperature sensor detects the initial temperature value C0 of the target water pipeline 2, and transmits the detected data information to the data processor, and the data processor adjusts the initial power P0 of the electric heating belt 1 according to the ratio of the initial temperature C0 of the target water pipeline 2 to the target temperature range and the fluctuation of the current actual ambient temperature, and the adjusted power of the electric heating belt 1 is set to P1;

[0079] It can be understood that P1 is positively correlated with the absolute value of the ambient temperature difference evaluation value Si, and P1 is negatively correlated with the ratio of the target water pipeline initial temperature C0 to the target temperature range.

[0080] Specifically, for different temperature control application scenarios, the target water pipeline 2 requires different temperature control methods. The temperature control mode is divided into a linear heating mode and a constant temperature adjustment mode, and the temperature control mode is determined according to the difference between the ambient temperature and the target temperature, thereby increasing the practicality of the present invention; and the initial power of the electric heating tape 1 is jointly adjusted according to the volatility of the ambient temperature and the ratio of the target temperature range to the initial temperature of the target water pipeline 2, thereby increasing the accuracy of predicting the temperature of the target water pipeline 2.

[0081] Specifically, in the constant temperature adjustment mode, the temperature controller controls the electric heating belt 1 to heat the target water pipeline 2 with the adjusted electric heating belt 1 power P1, and the second temperature sensor detects the temperature C1 of the target water pipeline 2 in real time and transmits the detection result to the data processor.

[0082] When Ce1≤C0, the data processor determines that the temperature C1 of the target water pipeline 2 is within the target temperature range. The data processor draws the temperature change curve F(x) of the target water pipeline 2 according to the temperature of the target water pipeline 2, and obtains the derivative function of the temperature change curve F(x) as f(x).

[0083] The data processor analyzes the temperature change curve F(x) of the target water delivery pipeline 2, and compares the target water delivery pipeline 2 temperature C1 with the target temperature range Ce1-Ce2, where Ce1 is the minimum target temperature, Ce2 is the maximum target temperature, and the target temperature middle value is Ce3, Ce3=(Ce1+Ce2)÷2,

[0084] If Ce3≥F(ti)≥Ce1, it is determined that the target water pipeline 2 temperature C1 is less than the middle value Ce3 of the target temperature range.

[0085] Wherein, if f(ti)>0, the data processor determines that the target water delivery pipeline 2 temperature C1 is rising, α=0;

[0086] If f(ti) < 0, the data processor determines that the temperature C1 of the target water pipeline 2 is decreasing, and there is a risk that the temperature of the target water pipeline 2 is lower than the target temperature range. The target water pipeline 2 is at the first temperature risk level, α = α1;

[0087] If Ce2≥F(ti)>Ce3, it is determined that the target water pipeline 2 temperature C1 is greater than the middle value Ce3 of the target temperature range.

[0088] Wherein, if f(ti)<0, the data processor determines that the target water delivery pipeline 2 temperature C1 is decreasing, α=0;

[0089] If f(ti)>0, the data processor determines that the temperature C1 of the target water pipeline 2 is rising, and there is a risk that the temperature of the target water pipeline 2 is higher than the target temperature range. The target water pipeline 2 is at the second temperature risk level, α=α2;

[0090] If f(ti)=0, it is determined that the temperature of the target water pipeline 2 remains stable, and the data processor controls the temperature controller to maintain the current power of the electric heating cable 1;

[0091] Wherein, F(ti) is the temperature value of the temperature change curve F(x) at any time point ti, f(ti) is the derivative value of the derivative function f(x) at any time point ti, and α is the temperature expression parameter of the temperature change curve;

[0092] For the expression parameter α of the temperature change curve, its value is related to the corresponding target water pipeline 2 temperature. Different expression parameters of the temperature change curve are set according to different target water pipeline 2 temperatures. α1 is the first preset value of the temperature expression parameter, and α2 is the second preset value of the temperature expression parameter, α1>α2;

[0093] When there is a temperature risk level in the target water pipeline 2, the data processor controls the temperature controller to adjust the power P1 of the electric heating tape 1. When the target water pipeline 2 is at the first temperature risk level, the power P1 of the electric heating tape 1 is increased, P1=Ce3÷C1÷ki×P0×α1. When the target water pipeline 2 is at the second temperature risk level, the power P1 of the electric heating tape 1 is reduced, P1=Ce3÷C1×ki×P0×α2, where ki is the absolute value of the slope of the temperature change curve F(x) at any time point ti.

[0094] Specifically, in the constant temperature adjustment mode, the temperature change trend of the target water pipeline 2 is judged according to the derivative function of the temperature change curve, the temperature risk level is evaluated, and different temperature expression parameters are set, thereby increasing the accuracy of the prediction of the target water pipeline 2 temperature.

[0095] Specifically, in the linear heating mode, the temperature controller controls the power P1 of the electric heating belt 1 to increase linearly with initial linear parameters during the heating process, P1, P2, P3, ... Pn, and the initial linear parameters include the number of linear heating nodes n and n-1 power increase coefficients m. The data processor determines the number of linear heating nodes n and the power increase coefficient m according to the heating time of the target water pipeline 2.

[0096] The data processor estimates the temperature rise time of the target water pipeline 2 according to the adjusted power P1 of the electric heating belt 1, and assumes that the temperature rise time of the target water pipeline 2 is t1, t1=Ce÷△C0×△t0, △C0 is the temperature change value of the target water pipeline 2 within the unit change time △t0,

[0097] The data processor calculates the power increase coefficient m of the electric heating belt 1 according to the ratio of the target heating time t1 of the water pipeline 2 to the target heating time te, m=(P1+t1÷te×P1)÷P1, and the number of linear increase nodes n=(1+V1÷P1×t1) -m , V1 is the growth rate of the power P1 of the electric heating cable 1,

[0098] When the second temperature sensor detects that the actual temperature of the target water delivery pipeline 2 reaches the target temperature range, the data processor controls the temperature controller to reduce the power of the electric heating belt 1 or stop heating.

[0099] Specifically, in the linear heating mode, the temperature controller linearly increases the power of the electric heating tape 1 with the initial linear parameters, and increases the heating temperature of the target water pipeline 2 by increasing the power of the electric heating tape 1, thereby reducing the heating time for the target water pipeline 2 to reach the target temperature range, thereby improving the temperature heating efficiency of the present invention for heating the target water pipeline 2.

[0100] Wherein, in the process of heating the target water pipeline 2 by the electric heating tape 1 in the linear heating mode, the second temperature sensor detects the temperature C1 of the target water pipeline 2 in real time and transmits the detection data to the data processor. When the temperature C1 of the target water pipeline 2 reaches the target temperature minimum value Ce1, the data processor controls the temperature controller to reduce the power P1 of the electric heating tape 1 to stop heating the target water pipeline 2. Since the temperature of the electric heating tape 1 is still greater than the temperature of the target water pipeline 2 at this time, the temperature of the target water pipeline 2 continues to rise under the influence of the residual heat of the electric heating tape 1. After reducing the power P1 of the electric heating tape 1, the data processor estimates the maximum temperature Cm1 of the target water pipeline 2 under the influence of the residual heat of the electric heating tape 1, Cm1=Pn÷P1×V2×t1, V2 is the temperature rise rate of the target water pipeline 2 when the power of the electric heating tape 1 is P1;

[0101] The data processor compares the maximum temperature Cm1 with the target temperature Ce2. If Cm1>Ce2, it is determined that the temperature of the target water pipeline 2 exceeds the target temperature range due to the residual heat of the electric heating belt 1. The data processor pre-regulates the power of the electric heating belt 1. The pre-regulation is divided into a primary pre-regulation mode and a secondary pre-regulation mode.

[0102] In the first-level pre-regulation mode, the data processor reduces the influence of the waste heat of the electric heating belt 1 on the temperature of the target water pipeline 2 by reducing the power gain coefficient m of the electric heating belt 1. The data processor reduces the power gain coefficient m of the electric heating belt 1 according to the ratio of the maximum temperature Cm1 of the target water pipeline 2 to the maximum temperature Ce2 of the target water pipeline 2. The power gain coefficient of the electric heating belt 1 after adjustment is assumed to be m', m'=Ce2÷Cm1×m;

[0103] In the secondary pre-regulation mode, the data processor reduces the influence of the waste heat of the electric heating tape 1 on the temperature of the target water pipeline 2 by reducing the number n of linear increase nodes of the power P1 of the electric heating tape 1. The data processor reduces the number n of linear increase nodes of the power P1 of the electric heating tape 1 according to the ratio of the maximum temperature Cm1 of the target water pipeline 2 to the maximum temperature Ce2 of the target temperature. The number of linear increase nodes of the power of the electric heating tape 1 after adjustment is assumed to be n', n'=Ce2÷Cm1×n.

[0104] The absolute value of the temperature difference between the initial temperature of the target water delivery pipeline 2 and the target temperature range is set to △C1, △C1=|Ce1-C0|, △Ce is the preset temperature difference value, and the data processor compares the absolute value of the temperature difference △C1 with the preset temperature difference value △Ce.

[0105] If △C1≥△Ce, it is judged that the temperature difference between the initial temperature of the target water delivery pipeline 2 and the target temperature range is large, and the data processor selects the secondary pre-regulation mode;

[0106] If ΔC1<ΔCe, it is determined that the temperature difference between the initial temperature of the target water delivery pipeline 2 and the target temperature range is small, and the data processor selects the first-level pre-regulation mode.

[0107] Specifically, when the temperature of the target water pipeline 2 reaches the target temperature range, the temperature controller controls the electric heating tape 1 to start reducing the power and stop heating, but the temperature of the electric heating tape 1 will not decrease immediately as the power decreases, and the target water pipeline 2 is still in a heating state under the residual heat of the electric heating tape 1. The temperature of the target water pipeline 2 continues to rise, and there is a risk that the temperature of the target water pipeline 2 exceeds the target temperature range. The data processor compares the maximum value of the target water pipeline 2 after the power of the electric heating tape 1 is reduced with the maximum value of the target temperature to determine whether the temperature of the target water pipeline 2 exceeds the target temperature range under the circumstances, and pre-adjusts the power of the electric heating tape 1 according to the comparison result, thereby saving electric energy and improving the accuracy of controlling and adjusting the temperature of the target water pipeline 2.

[0108] The data processor calculates the theoretical maximum temperature of the target water pipeline 2 when the electric heating belt 1 reaches the maximum power Pmax according to the temperature C0 of the target water pipeline 2 when the electric heating belt 1 is at the power P0. The theoretical maximum temperature Cmax=C0+Pmax÷P0×C0. The data processor compares the theoretical maximum temperature Cmax with the target temperature minimum Ce1 to determine whether the theoretical maximum temperature Cmax can reach the target temperature range.

[0109] If Cmax ≥ Ce1, it is determined that the electric heating cable 1 can meet the heating demand of the target water pipeline 2 at the maximum power;

[0110] If Cmax<Ce1, it is determined that the electric heating tape 1 cannot meet the heating demand of the target water pipeline 2, and the data processor controls the alarm unit to send out an alarm signal.

[0111] Specifically, if the theoretical maximum temperature of the target water pipeline 2 is not calculated, it is impossible to accurately determine whether the electric heating tape 1 can meet the target temperature range requirements set by the user, thereby affecting the subsequent heating and insulation process of the target water pipeline 2. The electric heating unit quantifies the heating capacity of the electric heating tape 1 by calculating the theoretical maximum temperature of the target water pipeline 2 when the power of the electric heating tape 1 reaches its maximum value, thereby improving the accuracy of heating and insulation of the target water pipeline 2.

[0112] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying 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 fall within the protection scope of the present invention.

[0113] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A constant temperature control system applied to a port water pipeline, characterized in that: include: A monitoring and detection module detects the ambient temperature in a preset initial acquisition cycle to obtain the current actual ambient temperature and the historical actual ambient temperature, and obtains the initial temperature of the target water pipeline and obtains several actual temperatures during the heating process of the target water pipeline by the electric heating tape, wherein the monitoring and detection module includes a first temperature sensor and a second temperature sensor; A preliminary processing module, which is used to obtain the current actual ambient temperature and determine a target temperature range and a target heating time according to the current actual ambient temperature; A data processing module, comprising a data processor and a temperature controller, for determining a temperature control mode for the target water pipeline according to the current actual ambient temperature and the target temperature range, wherein the temperature control mode is divided into a linear temperature rise mode and a constant temperature adjustment mode; based on different temperature control modes, the initial power of the electric heating belt is determined according to the current actual ambient temperature and the historical actual ambient temperature, and the initial power is corrected according to the initial temperature and the target temperature range to obtain the actual power; In the linear heating mode, the temperature controller gradually increases the power of the electric heating tape at a linear rate, and pre-adjusts the initial parameters of the linear rate according to the influence of the power of the electric heating tape on the temperature of the water pipeline; in the constant temperature adjustment mode, the temperature controller increases the temperature of the target water pipeline to the target temperature range at a fixed power, and adjusts the parameters to stabilize the temperature of the target water pipeline within the target temperature range; The upper limit of the target temperature range is the maximum value of the target temperature, and the lower limit is the minimum value of the target temperature. The first temperature sensor is used to detect the ambient temperature, and the second temperature sensor is used to detect the temperature of the target water pipeline.

2. The constant temperature control system for port water pipeline according to claim 1 is characterized in that: The first temperature sensor detects the current actual ambient temperature in real time and transmits the detection data to the data processor, the data processor calculates a target temperature difference evaluation value according to the actual ambient temperature and the minimum target temperature value, and determines a temperature control mode according to the target temperature difference evaluation value. If the target temperature difference evaluation value is greater than the temperature difference level evaluation value, the data processor determines that the temperature control mode is a linear heating mode; If the target temperature difference evaluation value is less than or equal to the temperature difference level evaluation value, the data processor determines that the temperature control mode is a constant temperature control mode; Among them, the temperature difference level evaluation value is a preset value, and the target temperature difference evaluation value is an absolute value of the difference between the current actual ambient temperature and the target temperature minimum value.

3. The constant temperature control system for port water pipeline according to claim 1 is characterized in that: The data processor calculates an environmental temperature difference evaluation value between the current actual ambient temperature and the historical actual ambient temperature, determines the fluctuation of the current actual ambient temperature according to the environmental temperature difference evaluation value, and determines the initial power of the electric heating belt according to the fluctuation; The ambient temperature difference evaluation value is the absolute value of the difference between the current actual ambient temperature and the historical actual ambient temperature.

4. The constant temperature control system for port water pipeline according to claim 3 is characterized in that: The second temperature sensor detects the initial temperature value of the target water pipeline and transmits the detected data information to the data processor. The data processor adjusts the initial power of the electric heating tape according to the ratio of the initial temperature of the target water pipeline to the target temperature range and the fluctuation of the current actual ambient temperature. The adjusted electric heating tape power is the actual power.

5. The constant temperature control system for port water pipeline according to claim 2 is characterized in that: In the constant temperature adjustment mode, The temperature controller controls the electric heating tape to heat the target water pipeline with the actual power, the second temperature sensor detects the temperature of the target water pipeline in real time, and transmits the detection result to the data processor, and the data processor determines that the target water pipeline temperature is within the target temperature range when the target temperature minimum value is less than or equal to the target water pipeline temperature. The data processor draws a temperature change curve of the target water pipeline according to the target water pipeline temperature, obtains a derivative function of the temperature change curve, and compares the target water pipeline temperature with the target temperature range. If the target water pipeline temperature at any time point of the temperature change curve is between the target temperature minimum value and the target temperature middle value, the data processor determines that the target water pipeline temperature is low within the target temperature range, and makes a low temperature risk determination on the target water pipeline temperature according to the temperature change trend; If the target water pipeline temperature of the temperature change curve is between the target temperature maximum value and the target temperature middle value at any time point, the data processor determines that the target water pipeline temperature is too high within the target temperature range, and makes a high temperature risk assessment on the target water pipeline temperature based on the temperature change trend.

6. The constant temperature control system for port water pipeline according to claim 5 is characterized in that: The target water pipeline temperature is subjected to risk assessment according to the temperature variation trend of the temperature variation curve, and the temperature expression parameter of the temperature variation curve is determined according to the temperature risk level of the target water pipeline, wherein: When the temperature of the target water pipeline is low, if the derivative value of the temperature change curve is less than zero, the data processor determines that the temperature of the target water pipeline is decreasing, the target water pipeline is at risk of being lower than the target temperature range, and is at the first temperature risk level, and the temperature expression parameter of the temperature change curve is equal to the first temperature expression parameter; When the temperature of the target water pipeline is high, if the derivative value of the temperature change curve is greater than zero, the data processor determines that the temperature of the target water pipeline is rising, the target water pipeline is at risk of exceeding the target temperature range, and is at the second temperature risk level, and the temperature expression parameter of the temperature change curve is equal to the second temperature expression parameter; If the derivative value of the temperature change curve is equal to zero, it is determined that the target water pipeline temperature remains stable, and the data processor controls the temperature controller to maintain the current power of the electric heating tape; Among them, the first preset value of the temperature expression parameter is greater than the second preset value of the temperature expression parameter.

7. The constant temperature control system for port water pipeline according to claim 2 is characterized in that: In the linear temperature rise mode, The temperature controller controls the power of the electric heating belt to increase linearly with initial linear parameters during the heating process. The initial linear parameters include the number of linear increase nodes and the power increase coefficient. The data processor determines the number of linear increase nodes and the power increase coefficient according to the heating time of the target water pipeline. When the second temperature sensor detects that the actual temperature of the target water pipeline reaches the target temperature range, the data processor controls the temperature controller to reduce the power of the electric heating belt or stop heating. Wherein, the data processor estimates the heating time of the target water pipeline according to the actual power of the electric heating belt.

8. The constant temperature control system for port water pipeline according to claim 7, characterized in that: The second temperature sensor detects the temperature of the target water pipeline in real time and transmits the detection data to the data processor, and the data processor estimates the maximum temperature of the target water pipeline under the influence of the residual heat of the electric heating belt after reducing the power of the electric heating belt. The data processor compares the maximum temperature with the target maximum temperature. If the maximum temperature is greater than the target maximum temperature, it is determined that the temperature of the target water pipeline exceeds the target temperature range due to the influence of the residual heat of the electric heating tape. The data processor pre-adjusts the power of the electric heating tape. The pre-adjustment is divided into a first-level pre-adjustment mode and a second-level pre-adjustment mode.

9. The constant temperature control system for port water pipeline according to claim 8, characterized in that: In the first-level pre-regulation mode, the data processor reduces the power gain coefficient of the electric heating belt, and the data processor calculates the reduced power gain coefficient of the electric heating belt according to the ratio of the maximum temperature of the target water pipeline to the maximum temperature of the target; In the secondary pre-regulation mode, the data processor reduces the number of linear increase nodes of the electric heating tape power, and the data processor calculates the reduced number of linear increase nodes of the electric heating tape power based on the ratio of the maximum temperature of the target water pipeline to the maximum target temperature.

10. The constant temperature control system for port water pipeline according to claim 1, characterized in that: The data processor calculates the theoretical maximum temperature of the target water pipeline when the electric heating cable reaches the maximum power, and compares the theoretical maximum temperature with the target minimum temperature. If the maximum theoretical temperature is greater than or equal to the minimum target temperature, it is determined that the electric heating tape can meet the heating demand of the target water pipeline at the maximum power; If the maximum theoretical temperature is less than the minimum target temperature, it is determined that the electric heating tape cannot meet the heating demand of the target water pipeline, and the data processor controls the alarm unit to send out an alarm signal.

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