Resistance wire pipeline heating temperature control system and method

Abstract

The embodiment of the invention provides a resistance wire pipeline heating temperature control system and method. The system comprises a cooperative temperature control module, a first detection module, a plurality of resistance wire heating modules and second detection modules corresponding to the resistance wire heating modules. The first detection module sends the environment temperature of the pipeline to the cooperative temperature control module; the cooperative temperature control module calculates initial heating power based on the environment temperature and the target temperature of each resistance wire heating module, and the initial heating power is included in a heating instruction to be sent to the corresponding resistance wire heating module; the resistance wire heating module heats the pipeline according to the initial heating power; the second detection module sends the heating temperature, detected in the current time period, of the corresponding resistance wire heating module to the cooperative temperature control module; and the cooperative temperature control module calculates to-be-adjusted heating power of the next time period, contains the to-be-adjusted heating power in a heating instruction and sends the heating instruction to the corresponding resistance wire heating module for subsequent heating temperature control, so that the temperature control precision and the heating uniformity of the pipeline are improved, and the energy consumption is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipeline heating, in particular to a resistance wire pipeline heating temperature control system and method. BACKGROUND

[0002] Pipeline heating is widely used in the fields of petroleum, chemical industry, food processing, etc., for heating fluid in the pipeline by different heat sources. In the related technology, the resistance wire pipeline heating temperature control technology generally adopts the mode of single-section resistance wire winding and fixed heating power to heat and control the temperature of the pipeline. Specifically, the resistance wire is uniformly wound along the full length of the pipeline, and the pipeline is heated by using fixed power output to the resistance wire. However, heating the pipeline by using single-section resistance wire and fixed heating power can easily lead to uneven temperature distribution of the pipeline, large temperature difference between the proximal end and the distal end, and can cause local overheating of the pipeline due to heat accumulation, and insufficient heating of the low-temperature area can cause medium condensation (such as natural gas hydrate blockage in gas pipeline, etc.), thereby the temperature control precision is not high, and the overall power is in long-term high-load operation, and the proportion of invalid heating is high, which makes the overall energy consumption high. SUMMARY

[0003] The purpose of the embodiments of the present application is to provide a resistance wire pipeline heating temperature control system and method to improve the pipeline temperature control precision and heating uniformity, and reduce energy consumption. The specific technical solutions are as follows:

[0004] The embodiments of the present application provide a resistance wire pipeline heating temperature control system, which comprises a cooperative temperature control module, a first detection module, a plurality of resistance wire heating modules designed in sections, and a second detection module corresponding to each resistance wire heating module.

[0005] The first detection module is configured to send the detected ambient temperature of the pipeline to the cooperative temperature control module.

[0006] The cooperative temperature control module is configured to calculate the initial heating power of each resistance wire heating module based on the ambient temperature and the target temperature of each resistance wire heating module, and send the heating instruction containing the initial heating power to the corresponding resistance wire heating module, and send the resistance wire temperature detection instruction to each second detection module.

[0007] The resistance wire heating module is configured to heat the pipeline according to the corresponding initial heating power in the heating instruction.

[0008] The second detection module is configured to send the detected heating temperature of the corresponding resistance wire heating module in the current time period to the cooperative temperature control module according to the temperature detection period.

[0009] The cooperative temperature control module is also used for, for each resistance wire heating module, calculating a to-be-adjusted heating power required for the next time period according to a target temperature and a heating temperature in a current time period, sending a heating instruction containing the to-be-adjusted heating power to the corresponding resistance wire heating module, and performing subsequent heating temperature control.

[0010] Optionally, the cooperative temperature control module is specifically used for, when receiving the pipeline heating instruction, sending an environment temperature detection instruction to the first detection module; in response to receiving the environment temperature sent by the first detection module, calculating an initial heating power of each resistance wire heating module based on the environment temperature and a target temperature of each resistance wire heating module; sending a heating instruction containing the initial heating power to the corresponding resistance wire heating module, and sending a resistance wire temperature detection instruction to each second detection module.

[0011] The first detection module is specifically used for receiving the environment temperature detection instruction, monitoring a temperature of an environment in which the pipeline is located, and sending the detected environment temperature to the cooperative temperature control module.

[0012] Optionally, a composite insulation structure is arranged outside the resistance wire heating module, the composite insulation structure has a ceramic fiber as an inner layer, a mica tape as a middle layer, and a stainless steel sheath as an outer layer.

[0013] Optionally, the resistance wire of the resistance wire heating module is wound in a spiral manner, and a pitch is determined according to a pipe diameter and a power density of the pipeline through the following expression:

[0014]

[0015] wherein S represents the pitch, S base represents a reference pitch, D ref represents a reference pipe diameter, D represents the pipe diameter of the pipeline, P density represents the power density of the pipeline, P tef represents a reference power density.

[0016] Optionally, the cooperative temperature control module is specifically used for calculating the initial heating power of the resistance wire heating module based on the environment temperature and the target temperature of the resistance wire heating module through the following expression:

[0017]

[0018] wherein P base represents the initial heating power of the resistance wire heating module, Q loss represents heat loss of a single point of the pipeline, L segment represents a pipeline length covered by a single point of the resistance wire, and λ represents a thermal conductivity coefficient of a heat preservation layer of the resistance wire heating module, T setT represents a target temperature of the resistance wire heating module env D represents an ambient temperature ins D represents an outer diameter of the resistance wire heating module insulation layer pipe D represents a pipe outer diameter

[0019] Optionally, the cooperative temperature control module is specifically configured to calculate the adjusted heating temperature to be adjusted for the next time period according to the target temperature of the resistance wire heating module and the heating temperature in the current time period, by using the following expression:

[0020]

[0021] e(t) = T set -T actual ;

[0022] wherein u(t) represents the adjusted heating temperature to be adjusted for the next time period of the resistance wire heating module, K p K represents a proportional coefficient i K represents an integral coefficient d K represents a differential coefficient, and e(t) represents a deviation between the target temperature of the resistance wire heating module and the heating temperature in the current time period set T represents a target temperature of the resistance wire heating module actual T represents a heating temperature of the resistance wire heating module in the current time period

[0023] According to the adjusted heating temperature to be adjusted, the corresponding adjusted heating power is determined.

[0024] Optionally, the cooperative temperature control module is further configured to monitor the current of each resistance wire heating module, and perform adjacent segment power compensation on an abnormal resistance wire heating module corresponding to an abnormal current when the abnormal current is detected.

[0025] The cooperative temperature control module is specifically configured to calculate the compensation heating power of the resistance wire heating module adjacent in space to the abnormal resistance wire heating module by using the following expression, and send a heating instruction containing the compensation heating power to the corresponding resistance wire heating module:

[0026]

[0027] wherein j represents the identification of the abnormal resistance wire heating module, j±1 respectively represent the identification of the last and next segment resistance wire heating modules adjacent in space to the abnormal resistance wire heating module, Pj+1 represents the compensation heating power of the resistance wire heating module adjacent in space to the abnormal resistance wire heating module, Pj+1 represents the original heating power of the resistance wire heating module adjacent in space to the abnormal resistance wire heating module, and a represents a compensation gain coefficientset a target temperature of the resistance wire heating module, T j±1 a heating temperature of the resistance wire heating module adjacent to the abnormal resistance wire heating module in space.

[0028] Optionally, the system further comprises a safety protection module and a waste heat recovery module; the safety protection module is arranged between the collaborative temperature control module and each resistance wire heating module, and each resistance wire heating module corresponds to one safety protection module and one waste heat recovery module respectively;

[0029] The safety protection module is configured to detect the current or temperature of the corresponding resistance wire heating module, and start a safety protection measure when the detected current or temperature exceeds a corresponding preset threshold.

[0030] The waste heat recovery module is configured to transmit the heat outside the heating pipeline of the corresponding resistance wire heating module to a target system.

[0031] Optionally, the system further comprises a remote monitoring platform connected with the collaborative temperature control module.

[0032] The remote monitoring platform is configured to send pipeline heating instructions and data transmission instructions to the collaborative temperature control module, and receive and display the data uploaded by the collaborative temperature control module.

[0033] The collaborative temperature control module is further configured to upload the heating temperature and heating power of each resistance wire heating module to the remote monitoring platform when receiving the data transmission instruction.

[0034] The embodiment of the application further provides a resistance wire pipeline heating temperature control method applied to the resistance wire pipeline heating temperature control system.

[0035] The first detection module sends the detected environmental temperature of the pipeline to the collaborative temperature control module.

[0036] The collaborative temperature control module calculates the initial heating power of each resistance wire heating module based on the environmental temperature and the target temperature of each resistance wire heating module, sends the heating instructions containing the initial heating power to the corresponding resistance wire heating module, and sends the resistance wire temperature detection instructions to each second detection module.

[0037] The resistance wire heating module heats the pipeline according to the corresponding initial heating power in the heating instructions.

[0038] The second detection module sends the detected heating temperature of the corresponding resistance wire heating module in the current time period to the collaborative temperature control module according to the temperature detection period.

[0039] The cooperative temperature control module calculates the adjusted heating power required by each resistance wire heating module in the next time period according to the target temperature and the heating temperature in the current time period, sends the heating instruction containing the adjusted heating power to the corresponding resistance wire heating module, and performs subsequent heating temperature control.

[0040] The embodiment of the present application has the following beneficial effects:

[0041] The resistance wire pipeline heating temperature control system and method provided by the embodiment of the present application heat the pipeline through the segmented resistance wire heating module, thereby improving the heating uniformity of the pipeline. In the process of heating the pipeline, the heating power of each resistance wire heating module is dynamically adjusted, thereby improving the temperature control accuracy of the pipeline. In the process of heating the pipeline, the heating power of each resistance wire heating module is dynamically allocated, thereby reducing invalid heating and energy consumption, and the segmented design of the resistance wire heating module reduces the redundant laying of the resistance wire and the amount of raw materials.

[0042] Of course, implementing any product or method of the present application does not necessarily require all the advantages described above. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other embodiments can also be obtained by those skilled in the art based on these drawings.

[0044] Figure 1 A structural schematic diagram of the resistance wire pipeline heating temperature control system provided by the embodiment of the present application;

[0045] Figure 2 Another structural schematic diagram of the resistance wire pipeline heating temperature control system provided by the embodiment of the present application;

[0046] Figure 3 A flowchart of the resistance wire pipeline heating temperature control method provided by the embodiment of the present application. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art based on the present application belong to the scope of protection of the present application.

[0048] In related technologies, resistance wire pipeline heating and temperature control uses a single-segment resistance wire winding and fixed heating power to heat and control the pipeline. Taking a gas pipeline as an example, using a single-segment resistance wire with fixed power to heat the pipeline can easily lead to a temperature difference of more than 5°C between the near and far ends of the pipeline. Local areas may overheat due to heat accumulation (such as greater than the set value of 10°C), while insufficient heating in low-temperature areas may cause condensation of the medium (such as natural gas hydrate blockage). In addition, the overall power of the resistance wire runs at high load for a long time, resulting in ineffective heating accounting for as much as 30% to 40%, severe heat loss, and high energy consumption.

[0049] In order to improve the temperature control accuracy and heating uniformity of the pipeline and reduce energy consumption, the embodiment of the present invention provides a resistance wire pipeline heating temperature control system and method. The resistance wire pipeline heating temperature control system provided by the embodiment of the present invention is as follows: Figure 1 As shown, the resistance wire pipeline heating temperature control system 100 includes: a first detection module 101, a coordinated temperature control module 102, and multiple resistance wire heating modules 103 ( Figure 1 exemplarily shows a resistance wire heating module), each resistance wire heating module corresponds to a second detection module 104.

[0050] Among them, the first detection module 101 is connected to the collaborative temperature control module 102, the collaborative temperature control module 102 is respectively connected to each resistance wire heating module 103 and its corresponding second detection module 104, and the resistance wire heating module 103 is connected to its corresponding second detection module 104.

[0051] The first detection module 101 is configured to send the detected ambient temperature of the pipeline to the coordinated temperature control module 102 .

[0052] The collaborative temperature control module 102 is used to calculate the initial heating power of each resistance wire heating module 103 based on the ambient temperature and the target temperature of each resistance wire heating module 103, and send the heating instruction containing the initial heating power to the corresponding resistance wire heating module 103, and send the resistance wire temperature detection instruction to each second detection module 104.

[0053] The resistance wire heating module 103 is used to heat the pipeline according to the initial heating power corresponding to the heating instruction;

[0054] The second detection module 104 is used to send the heating temperature of the corresponding resistance wire heating module 103 detected in the current time period to the collaborative temperature control module 102 according to the temperature detection cycle;

[0055] The collaborative temperature control module 102 is also used to calculate the adjusted heating power required for the next time period for each resistance wire heating module 103 based on its target temperature and the heating temperature in the current time period, and send the heating instruction containing the adjusted heating power to the corresponding resistance wire heating module 103 for subsequent heating and temperature control.

[0056] The present invention provides a resistance wire pipeline heating and temperature control system that heats the pipeline using segmented resistance wire heating modules, improving heating uniformity. During pipeline heating, the heating power of each resistance wire heating module is dynamically adjusted, improving temperature control accuracy. Furthermore, the dynamic allocation of heating power among the resistance wire heating modules during pipeline heating reduces ineffective heating and, consequently, energy consumption. The segmented design of the resistance wire heating modules also reduces redundant installation of resistance wire and reduces raw material usage.

[0057] In this embodiment of the present invention, the resistance wire heating modules are designed in sections. A coordinated temperature control module controls these sections to heat the pipeline. The pipeline can be any pipeline that requires heating, such as a gas pipeline or an oil pipeline. Each resistance wire heating module has a corresponding temperature detection module (i.e., the second detection module). The environmental detection module (i.e., the first detection module) is connected to the coordinated temperature control module to monitor the ambient temperature of the pipeline.

[0058] In one possible embodiment, the collaborative temperature control module 102 is specifically used to send an ambient temperature detection instruction to the first detection module 101 when receiving a pipeline heating instruction. The ambient temperature detection instruction may include a trigger signal for starting ambient temperature detection. Accordingly, the first detection module 101 is specifically used to receive the ambient temperature detection instruction sent by the collaborative temperature control module 102, monitor the temperature of the environment in which the pipeline is located, and send the detected ambient temperature to the collaborative temperature control module 102. Furthermore, the collaborative temperature control module 102 is specifically used to respond to the ambient temperature sent by the first detection module 101, calculate the initial heating power of each resistance wire heating module 103 based on the ambient temperature and the target temperature of each resistance wire heating module 103, and send the heating instruction containing the initial heating power to the corresponding resistance wire heating module 103, and send the resistance wire temperature detection instruction to each second detection module 104.

[0059] In practical applications, the first detection module 101 can be deployed according to the layout of the pipeline. For example, if the pipeline is outdoors, a first detection module 101 can be set outdoors; if the pipeline is indoors, a first detection module 101 can be set indoors; if the pipeline passes through both indoors and outdoors, a first detection module 101 can be set indoors and outdoors, respectively. For example, the first detection module 101 can be a thermal resistor for detecting the ambient temperature. The first detection module 101 can send the detected ambient temperature to the cooperative temperature control module 102 through an RS485 or CAN bus.

[0060] The cooperative temperature control module 102 can be a PID controller. The PID controller takes ARM Cortex-M7 as the core, supports multi-channel PID calculation, adopts an IGBT (Insulate-Gate Bipolar Transistor) or MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) module for driving, and outputs a PWM (Pulse width modulation) signal to adjust the heating power of the resistance wire heating module 103. For example, the cooperative temperature control module 102 sends a heating instruction containing an initial heating power to the corresponding resistance wire heating module 103 in the form of a PWM signal. In one example, the cooperative temperature control module 102 can be one or more. When the cooperative temperature control module 102 is one, it controls all the resistance wire heating modules 103. When the cooperative temperature control module 102 is multiple, each cooperative temperature control module 102 can control multiple resistance wire heating modules 103, and the parameters can be shared between the cooperative temperature control modules 102.

[0061] The target temperature of each resistance wire heating module 103 is a desired / target heating temperature preset for each resistance wire heating module 103, which can be the same (e.g., set the same for pipes under the same ambient temperature) or different (e.g., set differently for pipes under different ambient temperatures). In the embodiments of the present application, the target temperature of each resistance wire heating module 103 is the same. The resistance wire heating module 103 can be a segmented resistance wire. In one example, the material of the resistance wire can be nickel-chromium alloy (Cr20Ni80) or iron-chromium-aluminum alloy (0Cr25Al5), etc., in which the nickel-chromium alloy can withstand a temperature of 1200°C, and the iron-chromium-aluminum alloy can withstand a temperature of 1400°C.

[0062] The plurality of resistance wire heating modules 103 are arranged along the pipe. The resistance wire heating module 103 can be segmented according to the length of the pipe, or segmented according to the length of the resistance wire. For example, the length of the resistance wire corresponding to each resistance wire heating module 103 can be set to 5-10 meters, or a segment of resistance wire of 5-10 meters along the pipe corresponds to one resistance wire heating module 103. Each resistance wire heating module 103 is connected to the cooperative temperature control module 102 and independently powered. The resistance wire heating module 103 is pre-buried in the pipe jacket layer and adheres to the pipe wall to improve heat transfer efficiency. The segmented design of the plurality of resistance wire heating modules 103 reduces the redundant laying of resistance wires, and the amount of raw materials can be reduced by 15%-20%.

[0063] The cooperative temperature control module 102 calculates the initial heating power of each resistance wire heating module 103 and sends a heating instruction containing the initial heating power to the corresponding resistance wire heating module 103, so that each resistance wire heating module 103 heats the pipe according to the initial heating power when receiving the heating instruction containing the initial heating power. At the same time, the cooperative temperature control module 102 sends resistance wire temperature detection instructions to each second detection module 104.

[0064] In one example, the resistance wire temperature detection instruction can include a temperature detection period and a temperature detection frequency. When receiving the resistance wire temperature detection instruction, each second detection module 104 detects the surface temperature of the corresponding resistance wire heating module 103 according to the temperature detection period and the temperature detection frequency in the resistance wire temperature detection instruction. The specific temperature detection period and the temperature detection frequency can be set according to actual needs, for example, the temperature detection period can be set to 1 millisecond, 1 second or 1 minute, and the temperature detection frequency can be set to 1 millisecond / 2 times, 1 second / 5 times or 1 minute / 10 times. Specifically, the second detection module 104 can be a PT100 thermal resistance, and the infrared temperature measurement probe of the thermal resistance can be arranged on the outer surface of the corresponding resistance wire heating module 103, and can also be arranged at the key nodes (such as valves, elbows) of the pipeline where the corresponding resistance wire heating module 103 is located, and an additional infrared temperature measurement probe can also be added at the key nodes of the pipeline.

[0065] The second detection module 104 monitors the heating temperature of the corresponding resistance wire heating module 103 according to the temperature detection period and the temperature detection frequency, and sends the detected heating temperature of the corresponding resistance wire heating module 103 in the current time period to the cooperative temperature control module 102 through the RS485 or CAN bus. The current time period is the period in which the second detection module 104 reports the heating temperature of the corresponding resistance wire heating module 103 to the cooperative temperature control module 102, for example, in real-time reporting, the current period can be the current 1 millisecond, 1 second or 1 minute, and in preset interval reporting, the current period can be the current 5 seconds, 1 minute, etc.

[0066] In order to adapt to the dynamic complexity of multi-section cooperative control, the embodiment of the present application independently controls the temperature of each resistance wire heating module 103. During the heating process of the pipeline, the cooperative temperature control module 102 receives the heating temperature sent by the second detection module 104 corresponding to each resistance wire heating module 103, calculates the adjusted heating power required for each resistance wire heating module 103 in the next time period according to the target temperature and the heating temperature in the current time period, and then sends the heating instruction containing the adjusted heating power to the corresponding resistance wire heating module 103, so as to dynamically adjust the heating power of each resistance wire heating module 103 and perform subsequent heating control.

[0067] In one possible implementation, a composite insulation structure is arranged outside each resistance wire heating module 103, the inner layer of the composite insulation structure is ceramic fiber, the middle layer is mica tape, and the outer layer is a stainless steel sheath.

[0068] In one example, the composite insulation structure directly wraps the outside of the resistance wire. Considering that the resistance wire will face the following problems during pipe heating: 1. High temperature oxidation: the resistance wire can work at a temperature of 300-800°C for a long time, and needs to be protected by high temperature resistant materials; 2. Risk of electrical insulation: easy to leak electricity in humid or corrosive environment; 3. Mechanical damage: pipe vibration, external impact may cause damage to the insulation layer. In the embodiment of the present application, in view of the high temperature characteristics of the resistance wire, the inner layer of the composite insulation structure uses ceramic fiber, which can isolate the thermal shock of the external environment to the resistance wire, delay high temperature oxidation, and make the outer layer of stainless steel sheath reflect radiant heat, reducing the surface temperature of the resistance wire by 10-15%. In view of the electrical insulation requirement, the middle layer of the composite insulation structure uses mica tape, which can provide main insulation and meet the industrial safety standard (IEC 60079) to enable the outer layer of stainless steel sheath to be designed to be grounded, thereby guiding the leakage current into the ground to avoid the risk of electric shock. In view of mechanical and chemical protection, the outer layer of the composite insulation structure uses a stainless steel sheath that can resist pipe vibration, external impact and acid and alkali corrosion (such as HS environment in a chemical plant), and the overall structure adopts a sealing design (such as laser welded joints) to prevent water vapor from entering.

[0069] For example, the materials, functions and parameters of each layer in the three-layer design of the composite insulation structure are shown in Table 1 below:

[0070] Table 1: Materials, functions and parameters of each layer of the composite insulation structure

[0071]

[0072] In order to balance the contradiction between safety and energy efficiency, the embodiment of the present application sets a composite insulation structure outside each resistance wire heating module 103 to improve the high temperature resistance, electrical insulation and mechanical protection capability of the resistance wire while ensuring heating efficiency. Moreover, compared with the use of silicone rubber insulation material in the traditional method, the ceramic fiber in the composite insulation structure in the embodiment of the present application has a temperature resistance of ≥1200°C, and uses three-layer packaging, so that the overall temperature resistance can reach 800°C, the risk of electric leakage can be reduced by 95%, and the grounding resistance of the stainless steel sheath is ≤0.1Ω (ohm), which can eliminate electromagnetic interference.

[0073] In one possible implementation, the resistance wire of the resistance wire heating module 103 is spirally wound, and the pitch is determined according to the pipe diameter and power density of the pipe by the following expression:

[0074]

[0075] wherein S represents the pitch, S base represents the reference pitch, D ref represents the reference pipe diameter, D represents the pipe diameter, and Pdensity represents the power density of the pipe, P ref represents the reference power density.

[0076] In one example, the embodiment of the present application pre-establishes a reference corresponding relationship table of pipe diameter, power density and pitch in advance according to the correlation of the pipe diameter and the power density of the pipe and the pitch through experimental calibration and theoretical calculation, as shown in Table 2, wherein the unit of the pipe diameter D is mm (millimeter), the unit of the power density P density is W / m (watt / meter), and the unit of the pitch S is mm. Correspondingly, S base , D ref and P ref in the above expression can be determined according to the reference corresponding relationship table (Table 2) of the pipe diameter, the power density and the pitch.

[0077] Table 2 Reference corresponding relationship table of pipe diameter, power density and pitch

[0078]

[0079] DN50 represents that the nominal diameter of the pipe is 50 mm, DN100 represents that the nominal diameter of the pipe is 100 mm, and so on.

[0080] For the pitch, the adjustment rule is set as follows: the larger the pipe diameter, the larger the pitch, and the winding density of the resistance wire is reduced to avoid local overheating; the higher the power density, the smaller the pitch, and the winding density is increased to match the high heat demand. In the process of adjusting the pitch, if the pitch is too small (the winding is too dense), although the heating uniformity is high and suitable for the demand of high power density, the local temperature of the resistance wire is too high, which may accelerate the insulation aging; if the pitch is too large (the winding is too sparse), although the local overheating risk is reduced and the material is saved, the heating uniformity is reduced, and a cold area (such as the far end of the pipe) may be generated.

[0081] In actual application, the pitch can be dynamically calculated by using the above expression of the present application combined with Table 2.

[0082] Example 1, the pipe is a DN200 pipe, and the power density is 60 W / m. According to the above Table 2, the pitch corresponding to DN200 is 80-120 mm, and the intermediate value 100 mm is taken as the reference pitch. Then, the pipe diameter D corresponding to the pipe is 200 mm, and the power density P density is 60 W / m; the reference pipe diameter D ref is 100 mm, and the reference power density P ref is 50 W / m. Further, the pitch S may be set to 60-80 mm according to the actual working condition.

[0083] Example 2, the pipeline is DN300 pipeline, the power density is 100W / m, querying the above table 2 can know that the pitch corresponding to DN300 is 120-150mm, taking the intermediate value 135mm as the reference pitch. Then, the pipe diameter D corresponding to the pipeline is 300mm, the power density P density is 100W / m; the reference pipe diameter D ref is 100mm, the reference power density P ref is 50W / m. Then, the pitch S can be set to 60-80mm in combination with the pipeline material.

[0084] Example 3, the pipeline is DN150 natural gas pipeline, the power density is 40W / m, querying the above table 2 can know that DN150 is between DN100-DN200, the power density 40W / m is close to 50W / m of DN100 in table 2. Then, the pipe diameter D corresponding to the pipeline is 150mm, the power density P density is 40W / m; the reference pipe diameter D ref is 100mm, the reference power density P ref is 50W / m, the reference pitch is selected as 65mm, the intermediate value of 50-80mm corresponding to DN100. Then, the pitch S can be set to 50-60mm, and the pitch S is preferably set to 55mm.

[0085] Example 4, the pipeline is DN250 chemical pipeline, the power density is 90W / m, querying the above table 2 can know that DN250 cannot directly correspond to any reference pipeline in table 2, and then the reference pitch can be selected as the intermediate value of the pitch of DN200 and DN300 or estimated by interpolation method, and the reference pitch is selected as 110mm. Then, the pipe diameter D corresponding to the pipeline is 250mm, the power density P density is 90W / m; the reference pipe diameter D ref is 100mm, the reference power density P ref is 50W / m. Then, the pitch S can be set to 50-70mm, and the pitch S is preferably set to 60mm.

[0086] In the embodiment of the application, the pitch is determined according to the pipe diameter and the power density of the pipeline, and in actual application, the pitch can also be dynamically adjusted, so that the adjustment of the pitch can avoid local overheating and better match high heat demand, further ensuring the uniformity, safety and optimal balance of energy efficiency of heating.

[0087] In a possible implementation, the cooperative temperature control module 102 is specifically configured to calculate the initial heating power of the resistance wire heating module 103 based on the ambient temperature and the target temperature of the resistance wire heating module 103 by using the following expression:

[0088]

[0089] wherein P base represents the initial heating power of the resistance wire heating module, Q loss represents the heat loss of the single-point pipeline, L segment represents the pipeline length covered by the single-point resistance wire, λ represents the thermal conductivity of the thermal insulation layer of the resistance wire heating module, T set represents the target temperature of the resistance wire heating module, T env represents the ambient temperature, D ins represents the outer diameter of the thermal insulation layer of the resistance wire heating module, and D pipe represents the outer diameter of the pipeline.

[0090] In the actual application, even if the target temperatures of the resistance wire heating modules 103 are the same, if the thickness of the thermal insulation layer of the resistance wire heating module arranged along the pipeline or the ambient temperature changes, for example, a part of the pipeline is buried underground and a part is arranged overhead, the Q loss needs to be calculated for each resistance wire heating module 103, which further causes the initial heating powers of the resistance wire heating modules 103 to be different.

[0091] In the embodiment of the application, the initial heating powers of the resistance wire heating modules are calculated based on the ambient temperature and the target temperature of the resistance wire heating module, so as to more quickly control the temperature of the pipeline heated by the resistance wire heating module.

[0092] In a possible implementation, the cooperative temperature control module 102 is specifically configured to calculate the adjusted heating temperature to be adjusted of the next time period required by the resistance wire heating module according to the target temperature of the resistance wire heating module and the heating temperature in the current time period by using the following expression:

[0093]

[0094] e(t)=T set -T actual ;

[0095] wherein u(t) represents the adjusted heating temperature to be adjusted of the next time period required by the resistance wire heating module, K p represents a proportional coefficient, K i represents an integral coefficient, and K drepresents a differential coefficient, e(t) represents a deviation between a target temperature of the resistance wire heating module and a heating temperature in a current time period, T set represents a target temperature of the resistance wire heating module, T actual represents a heating temperature of the resistance wire heating module in a current time period;

[0096] According to the heating temperature to be adjusted, a corresponding heating power to be adjusted is determined.

[0097] In the embodiment of the present application, the temperature control module 102 adopts an improved fuzzy PID algorithm to calculate the heating power of the resistance wire heating module. Specifically, in the initialization stage, the initial parameters of K p , K i and K d are calculated according to the pipe diameter D and the pipe length L. In one example, the initial K p , K i and K d may be calculated by the following expressions:

[0098]

[0099] wherein D ref represents a reference pipe diameter, K p0 , K i0 and K d0 are reference parameters, which are calibrated by experiments. L ref represents a reference pipe length, D represents a pipe diameter, and L represents a pipe length. For example, the reference pipe has D ref = 200 mm and L ref = 1000 m, the actual pipe has D = 150 mm and L = 500 m, then represents a lower pipe reduction proportional gain, to prevent oscillation.

[0100] In actual application, the parameters K p , K i and K d of the PID may be dynamically adjusted during the pipe heating process. Specifically, K p , K i and K d may be adjusted according to the size relationship between the deviation e(t) and a preset value, or K p , K i and K d may be adjusted according to a preset step. In one example, K p , K i and K d may be adjusted according to the size relationship between the deviation e(t) and a preset value, according to the adjustment rules of Table 3 as follows: p i ​and K d , wherein the preset value can be set according to actual conditions, and the preset value is 5℃ in Table 3 as an example.

[0101] Table 3K p , K i and K d Adjustment rule

[0102]

[0103] In one example, K p , K i and K d can be adjusted according to a fixed step size, and can also be adjusted according to an adaptive step size. The fixed step size can be set according to actual requirements, such as 0.1, 0.01, etc., and the adaptive step size can be set based on the rate of change of the deviation e(t) as ΔK=0.1·|de(t) / dt|.

[0104] After the heating temperature to be adjusted is calculated, the heating power to be adjusted corresponding to the heating temperature to be adjusted can be determined according to a pre-set temperature-power correspondence table.

[0105] In the embodiment of the present application, the cooperative temperature control module dynamically calculates the heating power to be adjusted required by each resistance wire heating module in the next time period in real time or periodically, so as to dynamically adjust the power of each resistance wire heating module, improve the pipeline temperature control precision, shorten the pipeline heating time, reduce invalid heating through dynamic power distribution, and reduce energy consumption. In addition, K p , K i and K d are dynamically adjusted to automatically adapt to different specifications of the pipeline, reduce the workload of manual parameter adjustment, and enhance the robustness of the cooperative temperature control module.

[0106] In one possible implementation, the cooperative temperature control module 102 is further configured to monitor the currents corresponding to each resistance wire heating module 103, and when detecting that there is an abnormal current, perform adjacent segment power compensation on the abnormal resistance wire heating module corresponding to the abnormal current.

[0107] The cooperative temperature control module 102 is specifically configured to calculate the compensation heating power of the resistance wire heating module spatially adjacent to the abnormal resistance wire heating module by using the following expression, and send a heating instruction containing the compensation heating power to the corresponding resistance wire heating module:

[0108]

[0109] Wherein, j represents the identification of the abnormal resistance wire heating module, j±1 represents the identification of the resistance wire heating module adjacent to the abnormal resistance wire heating module in space, represents the compensation heating power of the resistance wire heating module adjacent to the abnormal resistance wire heating module in space, represents the original heating power of the resistance wire heating module adjacent to the abnormal resistance wire heating module in space, and a represents a compensation gain coefficient, set represents the target temperature of the resistance wire heating module, j±1 represents the heating temperature of the resistance wire heating module adjacent to the abnormal resistance wire heating module in space.

[0110] In the embodiment of the present application, the cooperative temperature control module 102 can also monitor the current corresponding to each resistance wire heating module 103, and judge the detected current in real time or periodically. When the detected current suddenly changes to 0 or suddenly decreases by more than a preset mutation value within a preset time period, it indicates that the corresponding resistance wire heating module 103 is abnormal. At this time, the power compensation strategy of the adjacent section of the abnormal resistance wire heating module is started. The preset time period and the preset mutation value can be set according to actual needs, such as a preset time period of 10 seconds and a preset mutation value of 5℃, that is, a current decrease of >5℃ within 10 seconds.

[0111] The cooperative temperature control module 102 adopts The compensation heating power of the resistance wire heating module adjacent to the abnormal resistance wire heating module in space is calculated, and the value range of a can be 0.2-0.5. In one example, if the heating temperature of the abnormal resistance wire heating module still cannot reach the compensation value within a set time period after the power compensation of the resistance wire heating module j±1 adjacent to the abnormal resistance wire heating module j in space, the power compensation of the resistance wire heating module j±2 adjacent to the abnormal resistance wire heating module in space can be further adopted, and an alarm can be triggered and a backup heating unit can be started to replace the abnormal resistance wire heating module to heat the pipeline. The set time period can be set according to actual needs, such as 2 minutes, 5 minutes, etc.

[0112] In the process of adjacent section power compensation, in order to prevent the overload and burnout caused by the excessive power of a single section resistance wire heating module, the maximum power of a single section resistance wire heating module can be limited, such as setting the maximum power of a single section resistance wire heating module to be no more than 120% of the rated power.

[0113] In the embodiment of the present application, in the case of abnormal single section resistance wire heating module, the adjacent section power compensation is adopted by heat conduction compensation, which can reduce the fluctuation range of the pipeline heating temperature, meet the high-precision process requirements, reduce the regional temperature difference, and further avoid local overheating or low-temperature failure, thereby improving the pipeline temperature control precision and the stability of the pipeline medium.

[0114] In a possible implementation, the cooperative temperature control module 102 can also adopt the following expression to predict the adjusted heating temperature to be adjusted of the resistance wire heating module in the next time period according to the ambient temperature and the heating temperature of the resistance wire heating module:

[0115]

[0116] wherein ΔT represents the adjusted heating temperature to be adjusted of the xth resistance wire heating module in the next time period, T (x，τ) represents the heating temperature of the xth resistance wire heating module at time τ, T env represents the ambient temperature, γ represents the thermal diffusivity, γ = δ / ρC, δ represents the thermal conductivity of the pipeline, ρ represents the density of the pipeline material, C represents the specific heat capacity of the pipeline, and β represents the comprehensive heat dissipation coefficient (set according to factors such as ambient convection and field radiation).

[0117] In an example, the above-mentioned manner of predicting the adjusted heating temperature to be adjusted of the resistance wire heating module in the next time period according to the ambient temperature and the heating temperature of the resistance wire heating module can be used to determine the initial heating power of each resistance wire heating module, that is, the heating power corresponding to the adjusted heating temperature to be adjusted can be determined by querying a pre-set temperature-power correspondence table using the calculated adjusted heating temperature to be adjusted. Alternatively, the initial heating power of the resistance wire heating module calculated above can be corrected using the heating power corresponding to the adjusted heating temperature to be adjusted, and the correction manner can be, for example, an average value or a weighted average value, so as to improve the accuracy of the determination of the initial heating power and further facilitate the rapid heating of the pipeline.

[0118] The adjusted heating temperature to be adjusted of the resistance wire heating module in the next time period calculated according to the target temperature of the resistance wire heating module and the heating temperature in the current time period can also be modified according to the ambient temperature and the heating temperature of the resistance wire heating module, and the modification manner can be, for example, an average value or a weighted average value, so as to reduce the hysteresis of the PID control and further improve the temperature control accuracy of the pipeline.

[0119] The compensation heating power of the resistance wire heating module adjacent to the abnormal resistance wire heating module calculated above can also be modified according to the adjusted heating temperature to be adjusted of the resistance wire heating module in the next time period corresponding to the ambient temperature and the heating temperature of the resistance wire heating module, and the modification manner can be, for example, an average value or a weighted average value, so as to avoid overcompensation.

[0120] In an embodiment of the present invention, the adjusted heating temperature required for the next time period is predicted based on the ambient temperature and the heating temperature of the resistance wire heating module, which can reduce the regional temperature difference between different resistance wire heating modules, reduce ineffective heating, and optimize energy consumption.

[0121] In one possible implementation, Figure 2 As shown, the above-mentioned resistance wire pipeline heating temperature control system 100 may further include a safety protection module 105 and a waste heat recovery module 106; the safety protection module 105 is deployed between the coordinated temperature control module 102 and each resistance wire heating module 103, and each resistance wire heating module 103 corresponds to a safety protection module 105 and a waste heat recovery module 106;

[0122] The safety protection module 105 is used to detect the current or temperature of the corresponding resistance wire heating module 103 and initiate safety protection measures when the detected current or temperature exceeds the corresponding preset threshold;

[0123] The waste heat recovery module 106 is used to transfer the heat outside the heating pipe of the corresponding resistance wire heating module 103 to the target system.

[0124] Each resistance heating module 103 corresponds to a safety protection module 105. The safety protection module 105 is independently installed and independently controls the corresponding resistance heating module 103. In one example, the safety protection module 105 can be a fuse, leakage protector, residual current operated protective device (RCD), or overcurrent relay, providing protection against melting, leakage, and overcurrent. The fuse can be a temperature fuse whose operating temperature is 10% to 20% higher than the set value, automatically cutting off the power supply to the corresponding section upon triggering. The residual current protector has a sensitivity of 30mA (milliamperes) and a response time of ≤0.1 seconds. The overcurrent relay's threshold can be set to 120% of the rated current, enabling instantaneous tripping for protection. When the detected current or temperature exceeds a preset threshold, the safety protection module 105 cuts off the power supply to the corresponding resistance heating module 103. At this point, the collaborative temperature control module 102 detects that the current in the resistance heating module 103 is zero and initiates power compensation for adjacent sections.

[0125] In one example, a fin heat sink can be installed on the outer surface of each resistance wire heating module 103 to collect heat (waste heat) outside the heating pipe of the corresponding resistance wire heating module 103 through air or fluid, recover the waste heat, and transfer the heat outside the heating pipe of the corresponding resistance wire heating module 103 to the target system, which can be, for example, a heating system, a process water preheating system, etc.

[0126] To solve the conflict between energy consumption and response speed, in the embodiment of the present application, a safety protection module 105 is arranged for each resistance wire heating module 103, which can realize independent segmented fusing of each resistance wire, thereby reducing the system failure rate. A waste heat recovery module 106 is arranged for the resistance wire heating module 103, which can recover waste heat, thereby reducing carbon emissions and promoting environmental protection and energy sustainability.

[0127] In a possible implementation manner, as shown in Figure 2 the above resistance wire pipeline heating temperature control system 100 further comprises a remote monitoring platform 107, which is connected with the cooperative temperature control module 102.

[0128] The remote monitoring platform 107 is configured to send a pipeline heating instruction and a data transmission instruction to the cooperative temperature control module 102, and receive and display data uploaded by the cooperative temperature control module 102.

[0129] The cooperative temperature control module 102 is further configured to upload the heating temperature and the heating power of each resistance wire heating module 103 to the remote monitoring platform 107 when receiving the data transmission instruction.

[0130] The remote monitoring platform 107 can be a client or a server device, which is equivalent to a general controller. A user can remotely control the cooperative temperature control module 102 to dynamically adjust the power of each resistance wire heating module 103 to heat the pipeline through the remote monitoring platform 107. In an example, the user can send a pipeline heating instruction to the cooperative temperature control module 102 through the remote monitoring platform 107. The cooperative temperature control module 102 sends an environment temperature detection instruction to the first detection module 101 to make the first detection module 101 detect the environment temperature of the pipeline when receiving the pipeline heating instruction. In the case of starting pipeline heating, the user can send a data transmission instruction to the cooperative temperature control module 102 through the remote monitoring platform 107. The data transmission instruction can include the identification of the data to be transmitted (such as the data identification of the heating temperature and the data identification of the heating power of each resistance wire heating module 103), the time period of transmitting data, etc. The cooperative temperature control module 102 uploads the heating temperature and the heating power of each resistance wire heating module 103 to the remote monitoring platform 107 when receiving the data transmission instruction. The remote monitoring platform 107 receives and displays the data uploaded by the cooperative temperature control module 102.

[0131] In an example, the remote monitoring platform 107 can also send an instruction for adjusting the parameters of the PID to the cooperative temperature control module 102. The cooperative temperature control module 102 can adjust K p , K i and K d in the above manner when receiving the instruction for adjusting the parameters of the PID.

[0132] In the embodiment of the present application, the remote monitoring platform can remotely control the cooperative temperature control module to dynamically adjust the power of each resistance wire heating module to heat the pipeline and dynamically adjust the control parameters, thereby reducing manual intervention and being more suitable for unattended environment.

[0133] For example, for the control scene of the temperature of the reaction gas in the chemical vapor deposition method, the pipeline to be heated is a DN6 carbon steel pipe with a length of 100 m, the ambient temperature changes with the room temperature, the target heating temperature is 70℃±1℃, and there is no antifreeze requirement. The resistance wire is divided into 20 segments according to the length of the pipeline, each segment of the resistance wire corresponds to a pipeline length of 5 m, the resistance wire is made of nickel-chromium alloy, the power density of the pipeline is 30 W / m, the second detection module corresponding to each segment of the resistance wire adopts a PT100 thermal resistance, and an infrared probe key node is additionally arranged; the cooperative temperature control module takes ARM Cortex-M7 as the core, and the temperature sampling / detection period is 1 second. The resistance wire pipeline heating temperature control system provided by the embodiment of the present application has the following operation effect: the regional temperature difference is ≤1.5℃, and the energy consumption is reduced by 32% compared with the traditional scheme of single-segment resistance wire fixed power heating.

[0134] For example, for the heat preservation scene of the high-temperature pipeline in the chemical industry, the pipeline to be heated is a DN150 stainless steel pipe with a length of 10 m, the medium temperature is maintained at 160℃±2℃(target heating temperature), and the ambient temperature is the room temperature. The resistance wire is divided into 5 segments according to the length of the pipeline, each segment of the resistance wire corresponds to a pipeline length of 2 m, the resistance wire is made of iron-chromium-aluminum alloy, the power density of the pipeline is 50 W / m, the composite insulation structure(insulation layer) adopts ceramic fiber+stainless steel sheath with a temperature resistance of 800℃, and the safety protection module adopts a fuse with an action temperature of 250℃. The resistance wire pipeline heating temperature control system provided by the embodiment of the present application has the following operation effect: the regional temperature difference is ≤1.5℃, the energy consumption is reduced by 28% compared with the traditional scheme of single-segment resistance wire fixed power heating, and the system maintenance cost is reduced by 40% due to no need to replace the insulation layer.

[0135] The embodiment of the present application also provides a resistance wire pipeline heating temperature control method, as shown in Figure 3 The method is applied to the resistance wire pipeline heating temperature control system and includes the following steps.

[0136] In S301, the first detection module sends the detected ambient temperature of the pipeline to the cooperative temperature control module.

[0137] In S302, the cooperative temperature control module calculates the initial heating power of each resistance wire heating module based on the ambient temperature and the target temperature of each resistance wire heating module, sends the heating instruction containing the initial heating power to the corresponding resistance wire heating module, and sends the resistance wire temperature detection instruction to each second detection module.

[0138] S303, the resistance wire heating module heats the pipeline according to the corresponding initial heating power in the heating instruction;

[0139] S304, the second detection module sends the heating temperature of the corresponding resistance wire heating module detected in the current time period to the cooperative temperature control module according to the temperature detection period;

[0140] S305, the cooperative temperature control module calculates the adjusted heating power required in the next time period for each resistance wire heating module according to the target temperature and the heating temperature in the current time period, sends the heating instruction containing the adjusted heating power to the corresponding resistance wire heating module, and performs subsequent heating control.

[0141] The resistance wire pipeline heating control method provided by the embodiment of the application can improve the heating uniformity of the pipeline by using the segmented resistance wire heating module to heat the pipeline. In the process of heating the pipeline, the heating power of each resistance wire heating module is dynamically adjusted to improve the temperature control accuracy of the pipeline. In the process of heating the pipeline, the heating power of each resistance wire heating module is dynamically allocated to reduce invalid heating and thus reduce energy consumption. In addition, the segmented design of the resistance wire heating module reduces the redundant laying of the resistance wire and reduces the amount of raw materials.

[0142] In a possible implementation, the method further includes: the cooperative temperature control module sends an environment temperature detection instruction to the first detection module when receiving the pipeline heating instruction.

[0143] The first detection module sends the detected environment temperature of the pipeline to the cooperative temperature control module, including: the first detection module receives the environment temperature detection instruction, monitors the temperature of the environment where the pipeline is located, and sends the detected environment temperature to the cooperative temperature control module.

[0144] The cooperative temperature control module calculates the initial heating power of each resistance wire heating module based on the environment temperature and the target temperature of each resistance wire heating module, and sends the heating instruction containing the initial heating power to the corresponding resistance wire heating module, and sends a resistance wire temperature detection instruction to each second detection module, including:

[0145] The cooperative temperature control module calculates the initial heating power of each resistance wire heating module based on the environment temperature and the target temperature of each resistance wire heating module in response to receiving the environment temperature sent by the first detection module; sends the heating instruction containing the initial heating power to the corresponding resistance wire heating module, and sends a resistance wire temperature detection instruction to each second detection module.

[0146] In a possible implementation, the cooperative temperature control module calculates an initial heating power of each resistance wire heating module based on the ambient temperature and a target temperature of the resistance wire heating module, respectively, including:

[0147] The initial heating power of the resistance wire heating module is calculated based on the ambient temperature and the target temperature of the resistance wire heating module by using the following expression:

[0148]

[0149] wherein P base represents the initial heating power of the resistance wire heating module, Q loss represents heat loss of the single-point pipeline, L segment represents the length of the pipeline covered by the single-point resistance wire, λ represents the thermal conductivity of the heat insulation layer of the resistance wire heating module, T set represents the target temperature of the resistance wire heating module, T env represents the ambient temperature, D ins represents the outer diameter of the heat insulation layer of the resistance wire heating module, D pipe represents the outer diameter of the pipeline.

[0150] In a possible implementation, the cooperative temperature control module calculates, for each resistance wire heating module, an adjusted heating power to be adjusted required for adjustment in a next time period according to a target temperature and a heating temperature in a current time period, including:

[0151] The adjusted heating temperature required for adjustment in the next time period is calculated according to the target temperature and the heating temperature in the current time period of the resistance wire heating module by using the following expression:

[0152]

[0153] e(t) = T set -T actual ;

[0154] wherein u(t) represents the adjusted heating temperature required for adjustment in the next time period of the resistance wire heating module, K p represents a proportional coefficient, K i represents an integral coefficient, K d represents a differential coefficient, and e(t) represents a deviation between the target temperature and the heating temperature in the current time period of the resistance wire heating module, T set represents the target temperature of the resistance wire heating module, T actual represents the heating temperature in the current time period of the resistance wire heating module.

[0155] The corresponding adjusted heating power is determined according to the adjusted heating temperature.

[0156] In a possible implementation, the method further includes:

[0157] The cooperative temperature control module monitors the current of each resistance wire heating module, and when detecting an abnormal current, performs adjacent segment power compensation on the abnormal resistance wire heating module corresponding to the abnormal current;

[0158] The cooperative temperature control module calculates the compensation heating power of the resistance wire heating module adjacent in space to the abnormal resistance wire heating module by using the following expression, and sends a heating instruction containing the compensation heating power to the corresponding resistance wire heating module:

[0159]

[0160] wherein j represents the identifier of the abnormal resistance wire heating module, j±1 respectively represent the identifiers of the previous and next resistance wire heating modules adjacent in space to the abnormal resistance wire heating module, represents the compensation heating power of the resistance wire heating module adjacent in space to the abnormal resistance wire heating module, represents the original heating power of the resistance wire heating module adjacent in space to the abnormal resistance wire heating module, and a represents a compensation gain coefficient, set represents the target temperature of the resistance wire heating module, j±1 represents the heating temperature of the resistance wire heating module adjacent in space to the abnormal resistance wire heating module.

[0161] It should be noted that, in this document, the relationship terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms “include”, “contain” or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement “including a…” does not exclude the presence of another identical element in the process, method, article or device including the element.

[0162] Each embodiment in the specification is described in a related manner, and the same or similar parts between each embodiment can be referred to each other. Each embodiment focuses on the difference from other embodiments.

[0163] The above description is only the preferred embodiment of the present application, and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A resistance wire pipeline heating and temperature control system, characterized in that: The system includes: a coordinated temperature control module, a first detection module, a plurality of resistance wire heating modules designed in sections, and a second detection module corresponding to each resistance wire heating module; A first detection module is used to send the detected ambient temperature of the pipeline to the collaborative temperature control module; The collaborative temperature control module is used to calculate the initial heating power of each resistance wire heating module based on the ambient temperature and the target temperature of each resistance wire heating module, and send a heating instruction containing the initial heating power to the corresponding resistance wire heating module, and send a resistance wire temperature detection instruction to each second detection module; The resistance wire heating module is used to heat the pipeline according to the initial heating power corresponding to the heating instruction; The second detection module is used to send the heating temperature of the corresponding resistance wire heating module detected in the current time period to the collaborative temperature control module according to the temperature detection cycle; The collaborative temperature control module is also used to calculate the adjusted heating power required for the next time period for each resistance wire heating module based on its target temperature and the heating temperature in the current time period, and send the heating instruction containing the adjusted heating power to the corresponding resistance wire heating module for subsequent heating and temperature control.

2. The system according to claim 1, wherein: The collaborative temperature control module is specifically configured to, upon receiving a pipeline heating instruction, send an ambient temperature detection instruction to the first detection module; in response to receiving the ambient temperature sent by the first detection module, calculate the initial heating power of each resistance wire heating module based on the ambient temperature and the target temperature of each resistance wire heating module; send a heating instruction containing the initial heating power to the corresponding resistance wire heating module, and send a resistance wire temperature detection instruction to each second detection module; The first detection module is specifically configured to receive the ambient temperature detection instruction, monitor the temperature of the environment in which the pipeline is located, and send the detected ambient temperature to the collaborative temperature control module.

3. The system according to claim 1, wherein: A composite insulation structure is arranged outside the resistance wire heating module. The inner layer of the composite insulation structure is ceramic fiber, the middle layer is mica tape, and the outer layer is a stainless steel sheath.

4. The system according to claim 1, wherein: The resistance wire of the resistance wire heating module is wound in a spiral manner, and the pitch is determined according to the pipe diameter and power density using the following expression: Among them, S represents the pitch, S base Indicates the base pitch, D ref Indicates the reference pipe diameter, D indicates the pipe diameter, P density Indicates the power density of the pipeline, P ref Indicates the reference power density.

5. The system according to claim 1, wherein: The collaborative temperature control module is specifically configured to calculate the initial heating power of the resistance wire heating module based on the ambient temperature and the target temperature of the resistance wire heating module using the following expression: Among them, P base Indicates the initial heating power of the resistance wire heating module, Q loss Indicates the heat loss of a single-point pipeline, L segment represents the length of the pipe covered by the single-point resistance wire, λ represents the thermal conductivity of the insulation layer of the resistance wire heating module, T set Indicates the target temperature of the resistance wire heating module, T env Indicates the ambient temperature, D ins Indicates the outer diameter of the insulation layer of the resistance wire heating module, D pipe Indicates the outer diameter of the pipe.

6. The system according to claim 1, wherein: The collaborative temperature control module is specifically used to calculate the heating temperature to be adjusted in the next time period based on the target temperature of the resistance wire heating module and the heating temperature in the current time period using the following expression: e(t)=T set -T actual ; Where u(t) represents the heating temperature to be adjusted in the next time period of the resistance wire heating module, K p Represents the proportionality coefficient, K i Indicates the integral coefficient, K d represents the differential coefficient, e(t) represents the deviation between the target temperature of the resistance wire heating module and the heating temperature in the current time period, T set Indicates the target temperature of the resistance wire heating module, T actual Indicates the heating temperature of the resistance wire heating module in the current time period; According to the heating temperature to be adjusted, the corresponding heating power to be adjusted is determined.

7. The system according to claim 1, wherein: The collaborative temperature control module is also used to monitor the current corresponding to each resistance wire heating module, and when abnormal current is detected, perform power compensation for adjacent sections of the abnormal resistance wire heating module corresponding to the abnormal current; The collaborative temperature control module is specifically configured to calculate the compensation heating power of the resistance wire heating module adjacent to the abnormal resistance wire heating module space using the following expression, and send a heating instruction containing the compensation heating power to the corresponding resistance wire heating module: Wherein, j represents the identifier of the abnormal resistance wire heating module, j±1 represents the identifiers of the upper and lower resistance wire heating modules adjacent to the abnormal resistance wire heating module space, Indicates the compensation heating power of the resistance wire heating module adjacent to the abnormal resistance wire heating module space. represents the original heating power of the resistance wire heating module adjacent to the abnormal resistance wire heating module space, α represents the compensation gain coefficient, T set Indicates the target temperature of the resistance wire heating module, T j±1 Indicates the heating temperature of the resistance wire heating module adjacent to the abnormal resistance wire heating module space.

8. The system according to any one of claims 1 to 7, characterized in that: The system also includes a safety protection module and a waste heat recovery module; the safety protection module is deployed between the collaborative temperature control module and each resistance wire heating module, and each resistance wire heating module corresponds to a safety protection module and a waste heat recovery module; The safety protection module is used to detect the current or temperature of the corresponding resistance wire heating module and initiate safety protection measures when the detected current or temperature exceeds the corresponding preset threshold; The waste heat recovery module is used to transfer the heat outside the heating pipe of the corresponding resistance wire heating module to the target system.

9. The system according to claim 2, wherein: The system further includes a remote monitoring platform, which is connected to the collaborative temperature control module; The remote monitoring platform is used to send pipeline heating instructions and data transmission instructions to the collaborative temperature control module, and receive and display the data uploaded by the collaborative temperature control module; The collaborative temperature control module is further configured to upload the heating temperature and heating power of each resistance wire heating module to the remote monitoring platform upon receiving the data transmission instruction.

10. A resistance wire pipeline heating and temperature control method, characterized in that: Applied to the resistance wire pipeline heating and temperature control system according to any one of claims 1 to 9, the method comprises: The first detection module sends the detected ambient temperature of the pipeline to the collaborative temperature control module; The collaborative temperature control module calculates the initial heating power of each resistance wire heating module based on the ambient temperature and the target temperature of each resistance wire heating module, and sends a heating instruction containing the initial heating power to the corresponding resistance wire heating module, and sends a resistance wire temperature detection instruction to each second detection module; The resistance wire heating module heats the pipeline according to the initial heating power corresponding to the heating instruction; The second detection module sends the heating temperature of the corresponding resistance wire heating module detected in the current time period to the collaborative temperature control module according to the temperature detection cycle; The collaborative temperature control module calculates the adjusted heating power required for the next time period for each resistance wire heating module based on its target temperature and the heating temperature in the current time period, and sends the heating instruction containing the adjusted heating power to the corresponding resistance wire heating module for subsequent heating and temperature control.

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