Heating temperature control system for denitration urea pipeline

Abstract

A heating temperature control system for a denitration urea pipeline belongs to the technical field of denitration systems and comprises an electric heat tracing device, a temperature measuring element and a DCS (distributed control system), the electric heat tracing device comprises a plurality of electric heat tracing belts which extend and are laid along the axial direction of the urea pipeline, and the plurality of electric heat tracing belts are arranged around the circumference of the urea pipeline at equal intervals. The electric heat tracing device is used for controlling the plurality of electric heat tracing belts to heat; the temperature measuring element is connected to the urea pipeline and is used for measuring the temperature of the urea pipeline; and the DCS control system is electrically connected with the electric heat tracing device and the temperature measuring element, is used for receiving temperature information measured by the temperature measuring element and is suitable for monitoring the operation of the electric heat tracing device, so that the heating temperature of the electric heat tracing device is controlled within a heating temperature range set by the DCS control system. The denitration urea pipeline heating temperature control system provided by the utility model has the technical effects that the fault rate can be reduced when a hydrolysis gas pipeline is heated, the electric tracing band is easy to disassemble and replace, the temperature measuring element is not easy to damage, and the temperature of the pipeline can be monitored in real time.

Description

Technical Field

[0001] This utility model belongs to the technical field of denitrification systems, and more specifically, it relates to a denitrification urea pipeline heating temperature control system. Background Technology

[0002] In recent years, thermal power plants have been committed to eliminating (liquid ammonia) stations by replacing liquid ammonia with urea hydrolysis gas, thereby eliminating this major hazard source in power plants. Urea hydrolysis gas is transported to the denitrification system, and the hydrolysis gas must be above 130℃ to function properly; otherwise, it easily crystallizes, causing pipeline blockage and affecting the normal operation of the denitrification system.

[0003] Urea hydrolysis gas pipelines in denitrification systems typically employ electric heat tracing via winding. Temperature sensing elements are installed on the pipelines and connected to a field thermometer to control the heating temperature. Specifically, the electric heat tracing system is activated when the pipeline temperature is low and deactivated when the temperature is high. The heating temperature is generally controlled within the range of 130℃-160℃. However, after commissioning, the equipment frequently malfunctions. The main problems include: 1) The thermometer operates in a poor environment, frequently malfunctioning and causing abnormal temperature control, leading to hydrolysis gas crystallization and pipeline blockage; 2) Operators cannot effectively monitor the pipeline temperature through the DCS system, making it impossible to take immediate action when abnormalities occur; 3) The use of winding electric heat tracing means that if the tracing system fails, it cannot be replaced immediately, affecting the normal operation of the denitrification system. Utility Model Content

[0004] The purpose of this utility model is to provide a denitrification urea pipeline heating temperature control system, which aims to solve the technical problem of frequent failures in the heating of hydrolysis gas pipelines after the transformation of thermal power plants to replace liquid ammonia with urea hydrolysis gas, affecting the operational stability and reliability of the denitrification system.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a denitrified urea pipeline heating temperature control system, comprising:

[0006] An electric heat tracing device includes multiple electric heat tracing cables extending axially along a urea pipeline. The multiple electric heat tracing cables are arranged at equal intervals around the circumference of the urea pipeline. The electric heat tracing device is used to control the heating of the multiple electric heat tracing cables.

[0007] A temperature sensing element is connected to the urea pipeline and used to measure the temperature of the urea pipeline.

[0008] The DCS control system is electrically connected to the electric heat tracing device and the temperature sensing element. It is used to receive temperature information measured by the temperature sensing element and is adapted to monitor the operation of the electric heat tracing device so that the heating temperature of the electric heat tracing device is controlled within the heating temperature range set by the DCS control system.

[0009] In another embodiment of this application, the urea pipeline is provided with a plurality of detachable connectors, and the plurality of connectors are used to fix a plurality of electric heating tapes to the outer wall of the urea pipeline.

[0010] In another embodiment of this application, the DCS control system is electrically connected to a wireless communication module, and the denitrification urea pipeline heating temperature control system also includes a remote control that is wirelessly connected to the DCS control system via the wireless communication module. The remote control has a control module suitable for controlling the operation of the electric heat tracing device and a display suitable for displaying the temperature measured by the temperature sensing element.

[0011] In another embodiment of this application, an insulation layer is provided on the outside of the urea pipeline, and multiple electric heating cables are provided between the urea pipeline and the insulation layer. The insulation layer is arranged along the circumference of the urea pipeline and surrounds the urea pipeline.

[0012] In another embodiment of this application, the urea pipeline is provided with support portions on both sides along its axial direction. The support portions are used to connect to and support the insulation layer, and the position of the insulation layer is adjusted by means of the support portions.

[0013] In another embodiment of this application, the insulation layer includes:

[0014] The left arc-shaped insulation plate is located on one side of the urea pipe along its axial direction. It is arc-shaped and matches the outer arc shape of the urea pipe, forming a gap with the urea pipe.

[0015] The right arc-shaped insulation plate is located on the other side of the urea pipeline along its axial direction. It is arc-shaped and matches the outer arc shape of the urea pipeline, forming a gap with the urea pipeline. The left arc-shaped insulation plate and the right arc-shaped insulation plate can be joined together to form a ring and surround the urea pipeline circumferentially. The electric heating tape is located inside the ring.

[0016] In another embodiment of this application, the support portion includes:

[0017] The left support is located on one side of the urea pipeline along its axial direction and has vertical lifting freedom. The upper end of the left support is hinged to the left arc-shaped insulation board, and the height of the left arc-shaped insulation board is adjustable by means of the left support.

[0018] The right support is located on the other side of the urea pipeline along its axial direction and has vertical lifting freedom. The upper end of the right support is hinged to the right arc-shaped insulation board, and the height of the right arc-shaped insulation board is adjusted by means of the right support.

[0019] In another embodiment of this application, both the left support and the right support are telescopic columns, and the lower end of the telescopic column is connected to a movable seat. The movable seat is placed on the ground and has the freedom to move in any direction. The upper end of the telescopic column is hinged to the middle of the left arc-shaped insulation board or the right arc-shaped insulation board. The position or angle of the left arc-shaped insulation board or the right arc-shaped insulation board relative to the telescopic column can be adjusted.

[0020] As another embodiment of this application, the denitrified urea pipeline heating temperature control system further includes a photovoltaic power supply component and a storage battery that are electrically connected to each other. The photovoltaic power supply component is used to collect solar energy and convert solar energy into electrical energy to charge the storage battery. The power output terminal of the storage battery is electrically connected to the electric heat tracing device and the DCS control system, and is used to supply power respectively.

[0021] In another embodiment of this application, the power output terminal of the battery is electrically connected to an inverter, which is used to convert direct current into alternating current. The power output terminal of the inverter is electrically connected to the electric heat tracing device and the DCS control system, and is used to supply alternating current respectively.

[0022] The beneficial effects of the denitrification urea pipeline heating temperature control system provided by this utility model are as follows: Compared with the prior art, the denitrification urea pipeline heating temperature control system of this utility model includes an electric heat tracing device, a temperature measuring element, and a DCS control system. The electric heat tracing device includes multiple electric heat tracing cables extending along the axial direction of the urea pipeline. The multiple electric heat tracing cables are arranged at equal intervals around the circumference of the urea pipeline. The electric heat tracing device is used to control the heating of the multiple electric heat tracing cables. The temperature measuring element is connected to the urea pipeline and is used to measure the temperature of the urea pipeline. The DCS control system is electrically connected to the electric heat tracing device and the temperature measuring element. It is used to receive the temperature information measured by the temperature measuring element and is suitable for monitoring the operation of the electric heat tracing device, so that the heating temperature of the electric heat tracing device is controlled within the heating temperature range set by the DCS control system. This solves the technical problem of frequent failures when heating the hydrolysis gas pipeline after the transformation of thermal power plants to replace liquid ammonia with urea hydrolysis gas, which affects the operational stability and reliability of the denitrification system. It has the technical effects of reducing the failure rate when heating the hydrolysis gas pipeline, making the electric heat tracing cable easy to disassemble and replace, making the temperature measuring element less prone to damage, and enabling real-time monitoring of the pipeline temperature. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1A schematic diagram of a denitrified urea pipeline heating temperature control system provided for an embodiment of this utility model;

[0025] Figure 2 A side view of a urea pipeline for a denitrified urea pipeline heating and temperature control system provided in an embodiment of this utility model;

[0026] Figure 3 A side view of the insulation layer and support structure of a denitrified urea pipeline heating temperature control system provided in this embodiment of the utility model;

[0027] Figure 4 for Figure 3 The image shows a side view of the left half of the insulation layer and support structure of a denitrified urea pipeline heating temperature control system.

[0028] Figure 5 for Figure 3 The image shows a side view of the right half of the insulation layer and support structure of a denitrified urea pipeline heating temperature control system.

[0029] Figure 6 This is a schematic diagram of the temperature measuring element and the insulation layer structure provided in another embodiment of the present invention.

[0030] In the diagram: 1. Electric heat tracing device; 11. Electric heat tracing tape; 2. Temperature sensing element; 3. DCS control system; 4. Urea pipeline; 5. Remote control; 6. Insulation layer; 61. Left arc-shaped insulation board; 62. Right arc-shaped insulation board; 7. Support part; 71. Left bracket; 72. Right bracket; 8. Movable base; 9. Top screw; 10. Photovoltaic power supply module; 11. Storage battery; 12. Inverter. Detailed Implementation

[0031] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0032] Please refer to the following: Figures 1 to 6This invention provides a heating and temperature control system for denitrified urea pipelines. The system includes an electric heat tracing device 1, a temperature measuring element 2, and a DCS control system 3. The electric heat tracing device 1 comprises multiple electric heat tracing cables 11 extending axially along the urea pipeline 4. These cables are evenly spaced around the urea pipeline 4 and control the heating of the cables. The temperature measuring element 2 is connected to the urea pipeline 4 and measures its temperature. The DCS control system 3 is electrically connected to the electric heat tracing device 1 and the temperature measuring element 2. It receives the temperature information measured by the temperature measuring element 2 and monitors the operation of the electric heat tracing device 1 to ensure that the heating temperature of the electric heat tracing device 1 is controlled within the heating temperature range set by the DCS control system 3.

[0033] This utility model provides a temperature control system for heating urea pipelines after denitrification. Compared with the prior art, it facilitates disassembly and replacement by setting an electric heat tracing device 1 along the axial direction of the urea pipeline 4. The temperature measuring element 2 is easy to install and disassemble. The DCS control system 3 can monitor the temperature changes of the urea pipeline 4 in real time, reducing the failure rate. It solves the technical problem of frequent failures when heating the hydrolysis gas pipeline after the transformation of thermal power plants to replace liquid ammonia with urea hydrolysis gas, which affects the operational stability and reliability of the denitrification system. It has the technical effects of reducing the failure rate when heating the hydrolysis gas pipeline, easy disassembly and replacement of the electric heat tracing tape 11, less damage to the temperature measuring element 2, and real-time monitoring of the pipeline temperature.

[0034] In this embodiment, the electric heat tracing device 1, DCS control system 3, and temperature measuring element 2 are existing technology products. The electric heat tracing device 1 includes multiple electric heat tracing cables 11. The arrangement of the electric heat tracing cables 11 differs from existing technologies. In existing technologies, they are all wrapped around the outer wall of the urea pipe 4. However, in this embodiment, the length direction of the electric heat tracing cables 11 is parallel to the axial direction of the urea pipe 4, that is, it is arranged along the axial direction of the urea pipe 4. This makes it easy to disassemble and replace. Multiple electric heat tracing cables 11 are arranged along the circumference of the urea pipe 4. In this embodiment, there are six cables. When the length of the electric heat tracing cable 11 is less than the length of the urea pipe 4, multiple electric heat tracing cables 11 can be spliced ​​together along the axial direction of the urea pipe 4, such as... Figure 1 The splicing configuration is shown in the diagram. The temperature sensing element 2 is a temperature-sensing device, or a temperature sensor or thermometer, capable of measuring the temperature of the outer wall of the urea pipeline 4 in real time and feeding it back to the DCS control system 3. The DCS control system 3 has a preset heating temperature range; in this invention, it is set to 130℃-160℃, thus maintaining the pipeline (referring to the urea pipeline 4) temperature within this range. The DCS control system 3 can monitor the operating status of the electric heat tracing device 1 in real time. Any abnormalities can be detected immediately and measures taken to prevent serious events such as pipeline crystallization, thereby improving the safety and reliability of the denitrification system.

[0035] As a specific embodiment of the denitrified urea pipeline heating temperature control system provided by this utility model, please refer to Figures 1 to 6 The urea pipe 4 is provided with multiple detachable connectors (existing technology, not shown in the figure), which are used to fix multiple electric heating cables 11 to the outer wall of the urea pipe 4. The connectors are aluminum foil binding wires or aluminum foil tapes, which can fix the electric heating cables 11 to the outer wall of the pipe without affecting the heat conduction.

[0036] To achieve remote automatic control of the heating temperature, as a specific embodiment of the denitrified urea pipeline heating temperature control system provided by this utility model, please refer to... Figures 1 to 6 The DCS control system 3 is electrically connected to a wireless communication module. The denitrification urea pipeline heating temperature control system also includes a remote controller 5 that is wirelessly connected to the DCS control system 3 via the wireless communication module. The remote controller 5 has a control module suitable for controlling the operation of the electric heat tracing device 1 and a display suitable for displaying the temperature measured by the temperature measuring element 2. This wireless communication unit is a prior art technology that enables wireless communication connection to the wireless communication module on the remote controller 5. The wireless communication connection method can refer to existing technologies, such as 4G, GPRS, etc. By operating the control module on the remote controller 5, the same control functions as the DCS control system 3 can be achieved, and the temperature signal can also be viewed remotely. Personnel can control the temperature without being close to the DCS control system 3, improving the flexibility of temperature control.

[0037] As a specific embodiment of the denitrified urea pipeline heating temperature control system provided by this utility model, please refer to Figures 1 to 6 The urea pipeline 4 is externally covered with an insulation layer 6. Multiple electric heating cables 11 are positioned between the urea pipeline 4 and the insulation layer 6. The insulation layer 6 is arranged circumferentially around the urea pipeline 4. The insulation layer 6 serves two purposes: firstly, it insulates the pipeline; secondly, it prevents heat from diffusing to the outside of the insulation layer 6. Most of the heat generated by the electric heating cables 11 is conducted to the pipeline, and subsequently to the urea hydrolysis gas inside the pipeline. The insulation layer 6 is made of insulating material. When it is necessary to disassemble the electric heating cables 11, the insulation layer 6 can be removed first, followed by the electric heating cables 11. The electric heating cables 11 and the temperature sensing element 2 are spaced apart along the axial direction of the pipeline, or the temperature sensing element 2 is positioned between two adjacent electric heating cables 11; that is, their placement does not affect each other.

[0038] As a specific embodiment of the denitrified urea pipeline heating temperature control system provided by this utility model, please refer to Figures 1 to 6The urea pipeline 4 has support portions 7 on both sides along its axial direction. The support portions 7 are used to connect to and support the insulation layer 6, and the position of the insulation layer 6 can be adjusted by means of the support portions 7. The support portions 7 can support the insulation layer 6 and also provide a certain height for the insulation layer 6, which is beneficial for insulation of pipelines at different heights.

[0039] To facilitate the disassembly and installation of the insulation layer 6 and to effectively perform its insulation function, as a specific embodiment of the denitrified urea pipeline heating temperature control system provided by this utility model, please refer to... Figures 1 to 6 The insulation layer 6 includes a left arc-shaped insulation plate 61 and a right arc-shaped insulation plate 62. The left arc-shaped insulation plate 61 is located on one side of the urea pipe 4 along its axial direction, is arc-shaped and matches the outer arc shape of the urea pipe 4, forming a gap between them. The right arc-shaped insulation plate 62 is located on the other side of the urea pipe 4 along its axial direction, is arc-shaped and matches the outer arc shape of the urea pipe 4, forming a gap between them. The left arc-shaped insulation plate 61 and the right arc-shaped insulation plate 62 can be joined together to form a ring that surrounds the urea pipe 4 circumferentially. The electric heating tape 11 is located inside the ring. The insulation layer 6 is divided into two parts: a left half (left arc-shaped insulation plate 61) and a right half (right arc-shaped insulation plate 62). The two parts can move radially along the pipe, thus they can be combined into a whole or separated. Separation facilitates the installation and disassembly of the electric heating tape 11, while combination provides insulation for the pipe. The two parts have the same structure, with a gap between their inner walls and the outer wall of the pipe. This gap is used to accommodate the electric heating tape 11, meaning the electric heating tape 11 is located inside this gap. The electric heating tape 11 is fixed to the outer wall of the pipe, and the insulation layer 6 surrounds multiple electric heating tapes 11 and the pipe.

[0040] As a specific embodiment of the denitrified urea pipeline heating temperature control system provided by this utility model, please refer to Figures 1 to 6 The support 7 includes a left bracket 71 and a right bracket 72. The left bracket 71 is located on one side of the urea pipe 4 along its axial direction and has a vertical degree of freedom. The upper end of the left bracket 71 is hinged to the left arc-shaped insulation plate 61, and the height of the left arc-shaped insulation plate 61 is adjustable using the left bracket 71. The right bracket 72 is located on the other side of the urea pipe 4 along its axial direction and has a vertical degree of freedom. The upper end of the right bracket 72 is hinged to the right arc-shaped insulation plate 62, and the height of the right arc-shaped insulation plate 62 is adjustable using the right bracket 72. The left bracket 71 and the right bracket 72 have the same structure and are located on both sides of the pipe, respectively. They both serve to support and adjust the height, so that the insulation layer 6 can find the accurate insulation position. The left arc-shaped insulation plate 61 has a degree of freedom of rotation about the hinge point relative to the left bracket 71, and the angle or position after rotation can be defined.

[0041] As a specific embodiment of the denitrified urea pipeline heating temperature control system provided by this utility model, please refer to Figures 1 to 6 Both the left support 71 and the right support 72 are telescopic columns, and the lower end of each telescopic column is connected to a movable seat 8. The movable seat 8 is placed on the ground and has the freedom to move in any direction. The upper end of the telescopic column is hinged to the middle of the left arc-shaped insulation plate 61 or the right arc-shaped insulation plate 62. The position or angle of rotation of the left arc-shaped insulation plate 61 or the right arc-shaped insulation plate 62 relative to the telescopic column can be adjusted. The telescopic length of the telescopic column can be adjusted to place the insulation layer 6 at a certain height, thereby adapting to the height of the pipe. After adjustment, its length can be locked, at which point the height of the insulation layer 6 is fixed. By rotating and locking the rotation position of the left arc-shaped insulation plate 61 or the right arc-shaped insulation plate 62, the position of the insulation layer 6 can be fixed.

[0042] Specifically, a set screw 9 is threaded through the upper end of both the left support 71 and the right support 72. The set screw 9 can be screwed on, allowing its inner end to abut against the left or right arc-shaped insulation plate 61 or 62, thus limiting the position of either plate. Tightening the set screw 9 in the opposite direction releases the lock on either plate. The movable seat 8 is a disc-shaped structure with multiple wheels at the bottom, allowing it to move in any direction. The moved position of the movable seat 8 can be locked.

[0043] To provide power to the electric heat tracing device 1 and the DCS control system 3, as a specific embodiment of the denitrified urea pipeline heating temperature control system provided by this utility model, please refer to... Figures 1 to 6 The denitrification urea pipeline heating temperature control system also includes a photovoltaic power supply component 10 and a storage battery 11 electrically connected to each other. The photovoltaic power supply component 10 is used to collect solar energy and convert it into electrical energy to charge the storage battery 11. The power output terminal of the storage battery 11 is electrically connected to the electric heat tracing device 1 and the DCS control system 3, and is used to supply power respectively. In this embodiment, the photovoltaic power supply component 10 and the storage battery 11 are both existing technologies, and are charged by solar energy. This reduces the use of mains power, thus reducing the use of mains power and energy resources. When the power inside the storage battery 11 is insufficient to supply power to the electric heat tracing device 1 and the DCS control system 3, it can be connected to the mains power for power supply.

[0044] As a specific embodiment of the denitrified urea pipeline heating temperature control system provided by this utility model, please refer to Figures 1 to 6The battery 11 has an inverter 12 electrically connected to its power output terminal. The inverter 12 converts direct current (DC) to alternating current (AC). The inverter 12's power output terminal is electrically connected to the electric heat tracing device 1 and the DCS control system 3, respectively, to supply AC power. When the electric heat tracing device 1 and the DCS control system 3 require AC power, the inverter 12 can be used to convert the DC to AC power to supply power to the electric heat tracing device 1 and the DCS control system 3.

[0045] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A de-merging urea pipeline heating temperature control system, characterized by, The application relates to a detachable urea pipe heating temperature control system. The detachable urea pipe heating temperature control system comprises the following parts: an electric heat tracing device, which comprises a plurality of electric heat tracing belts arranged along the axial direction of a urea pipe, the plurality of electric heat tracing belts being arranged at equal intervals around the circumference of the urea pipe, and the electric heat tracing device being used for controlling the heating of the plurality of electric heat tracing belts; a temperature measuring element connected to the urea pipe and used for measuring the temperature of the urea pipe; 2. A de-rated urea pipeline heating temperature control system as in claim 1, wherein, a DCS control system electrically connected to the electric heat tracing device and the temperature measuring element, used for receiving the temperature information measured by the temperature measuring element and adapted to monitor the operation of the electric heat tracing device so that the heating temperature of the electric heat tracing device is controlled within the heating temperature range set by the DCS control system.

3. A de-rated urea pipeline heating temperature control system as in claim 1, wherein, A plurality of detachable connecting pieces are arranged on the urea pipe, and the plurality of connecting pieces are used for fixing the plurality of electric heat tracing belts to the outer wall of the urea pipe.

4. A de-rated urea pipeline heating temperature control system as in claim 1, wherein, The DCS control system is electrically connected to a wireless communication module, and the detachable urea pipe heating temperature control system further comprises a remote controller wirelessly connected to the DCS control system through the wireless communication module, the remote controller being provided with a control module adapted to control the operation of the electric heat tracing device and a display adapted to display the temperature measured by the temperature measuring element.

5. A de-rated urea pipeline heating temperature control system as in claim 4, wherein, An insulation layer is arranged outside the urea pipe, the plurality of electric heat tracing belts are arranged between the urea pipe and the insulation layer, the insulation layer is arranged around the urea pipe along the circumferential direction of the urea pipe, and the insulation layer is arranged in a circular ring shape along the circumferential direction of the urea pipe.

6. A de-rated urea pipeline heating temperature control system as in claim 5, wherein, Supporting parts are arranged on the two sides of the urea pipe along the axial direction of the urea pipe, the supporting parts are used for connecting and supporting the insulation layer, and the position of the insulation layer is adjusted by means of the supporting parts. The insulation layer comprises: a left arc-shaped insulation plate arranged on one side of the urea pipe along the axial direction of the urea pipe, the left arc-shaped insulation plate being arc-shaped and matched with the arc shape of the outer wall of the urea pipe, and a gap being formed between the left arc-shaped insulation plate and the urea pipe; 7. A de-rated urea pipeline heating temperature control system as in claim 6, wherein, a right arc-shaped insulation plate arranged on the other side of the urea pipe along the axial direction of the urea pipe, the right arc-shaped insulation plate being arc-shaped and matched with the arc shape of the outer wall of the urea pipe, and a gap being formed between the right arc-shaped insulation plate and the urea pipe, the left arc-shaped insulation plate and the right arc-shaped insulation plate being capable of being combined to form a circular ring shape along the circumferential direction of the urea pipe, and the electric heat tracing belts being arranged inside the circular ring shape. The supporting parts comprise: a left support arranged on one side of the urea pipe along the axial direction of the urea pipe, the left support being provided with vertical lifting freedom, the upper end of the left support being hingedly connected to the left arc-shaped insulation plate, and the height of the left arc-shaped insulation plate being adjusted by means of the left support; 8. A de-rated urea pipeline heating temperature control system as in claim 7, wherein, a right support arranged on the other side of the urea pipe along the axial direction of the urea pipe, the right support being provided with vertical lifting freedom, the upper end of the right support being hingedly connected to the right arc-shaped insulation plate, and the height of the right arc-shaped insulation plate being adjusted by means of the right support. The left support and the right support are telescopic columns, the lower ends of the telescopic columns are connected to moving seats, the moving seats are arranged on the ground and have moving freedom in any direction, the upper ends of the telescopic columns are hingedly connected to the middle parts of the left arc-shaped insulation plate or the right arc-shaped insulation plate, and the position or angle of the left arc-shaped insulation plate or the right arc-shaped insulation plate relative to the telescopic columns can be adjusted.

9. A de-rated urea pipeline heating temperature control system as in claim 1, wherein, The urea pipeline heating temperature control system further comprises a photovoltaic power supply component and a storage battery which are electrically connected to each other, the photovoltaic power supply component is used for collecting solar energy and converting the solar energy into electric energy to charge the storage battery, and an electric energy output end of the storage battery is electrically connected to the electric heat tracing device and the DCS control system and is used for supplying electric power respectively.

10. A de-rated urea pipeline heating temperature control system as in claim 9, wherein, An inverter is electrically connected to the electric energy output end of the storage battery, the inverter is used for converting direct current into alternating current, and an electric energy output end of the inverter is electrically connected to the electric heat tracing device and the DCS control system and is used for supplying alternating current respectively.

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