A pipe heating device and a heating method suitable for large temperature change environment

Abstract

The application discloses a pipeline heating device and a heating method suitable for a large temperature change environment, and relates to the technical field of pipeline heating devices. The device comprises a high-temperature and high-pressure steam source (1), a steam distributor (2), a steam main pipe (3), a steam branch pipe (4), a condensate pipe (5) and a condensate system (6); the steam distributor (2) is connected with the high-temperature and high-pressure steam source (1) through the steam main pipe (3) at the inlet, and is connected with the steam branch pipe (4) at the outlet; the steam branch pipe (4) is connected with the condensate pipe (5) from inside a cabin to outside the cabin and then into the cabin again, and is finally connected with the condensate system (6) to form a passage. The steam flow, temperature and pressure in the spiral steam coil (43) are adjusted through the steam distributor (2), the main pipe electric steam regulating valve (31), the branch pipe electric steam regulating valve (41) and the steam booster pump (44), and preheating, heating and stopping heating are carried out according to different environmental temperatures, so that the medium in the pipeline under the large temperature change environment can flow normally, and the pipeline will not be deformed and leaked.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of pipeline heating equipment, and more particularly to a pipeline heating device suitable for large temperature change environment and a heating method. BACKGROUND

[0002] The navigation range of an ocean-going ship is large, usually including both hot regions and cold regions. The pipeline system of the ship is a pipeline equipment specially used for conveying various liquids and gases, which is crucial for the safe operation of the ship. It is easily affected by temperature, especially when the environment changes from >0℃ to extremely low temperature, the pipeline faces the condition of sudden temperature change, which can cause thermal expansion and cold contraction, deformation and displacement of the pipeline, sealing failure and leakage of the joint part, and the circulating medium in the pipeline freezes in the extremely low temperature environment, which cannot circulate normally, resulting in system failure.

[0003] Therefore, it is necessary to consider the heat preservation of the pipeline. The common heat preservation methods at present include laying heat preservation materials, hot water heating and electric heat tracing. For example, patent document CN202110995483.3 discloses a pipeline heating system and a ship, which comprises a main control box, an emergency control box, a first cable, a second cable and an electric heat tracing belt. The electric heat tracing belt is arranged on the pipeline for liquid flow. The present application ensures the normal operation of low temperature environment equipment and the safe driving of the ship by heating the pipeline through electric heat tracing, reduces the use of electric heat tracing belt, thereby reducing the difficulty of construction, and can reduce the consumption of electric energy.

[0004] For example, patent document CN202311421321.4 discloses a pipeline heating device, which is wound with a heat medium flow space on the pipeline, so that the heat medium can wrap the pipeline to prevent the pipeline from being frozen, which helps to solve the technical problem that the ship fire-fighting pipeline is easily frozen in the cold environment outside in the prior art. However, further research shows that the existing pipeline heating device does not consider the influence of sudden temperature change on the pipeline in large temperature change environment; moreover, the existing heating device has complex structure, large installation length and great construction difficulty, resulting in large material consumption and increased cost. SUMMARY

[0005] In view of the above defects or improvement needs of the prior art, the present application provides a pipeline heating device suitable for large temperature change environment and a heating method. The steam flow, temperature and pressure in the spiral steam coil are adjusted by the steam distributor, the electric steam regulating valve and the steam booster pump, and preheating, heating and stopping heating are carried out according to different environmental temperatures, so as to ensure the normal circulation of the medium in the pipeline in large temperature change environment and the pipeline does not deform and leak.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present application, the present application provides a pipeline heating device suitable for large temperature change environment, comprising: a high-temperature and high-pressure steam source, a steam distributor, a steam main pipe, a steam branch pipe, a condensate pipe and a condensate system;

[0007] The steam distributor is connected with the high-temperature and high-pressure steam source in the cabin through the steam main pipe at the inlet end, and is connected with the steam branch pipe at the outlet end, the steam branch pipe is connected with the condensate pipe after entering the cabin from outside the cabin, and finally is connected with the condensate system in the cabin, forming a circulating path;

[0008] The steam branch pipe comprises a steam straight pipe arranged in the cabin and a spiral steam coil pipe arranged outside the cabin, and a steam booster pump is arranged on the steam straight pipe to boost the steam entering the spiral steam coil pipe and provide power to prevent the spiral steam coil pipe from being frozen due to condensate;

[0009] The high-temperature and high-pressure steam provided by the high-temperature and high-pressure steam source flows along the path. The pipeline in the low-temperature environment outside the cabin is heated by the spiral steam coil pipe, the amount of steam entering the spiral steam coil pipe is adjusted by the steam distributor, and the steam pressure and temperature are ensured by the steam booster pump.

[0010] Further, a main pipe electric steam regulating valve is arranged on the steam main pipe at the inlet of the steam distributor for automatically controlling the opening and closing of the main pipeline, and a branch pipe electric steam regulating valve is arranged on each steam branch pipe at the outlet for automatically controlling the opening and closing of each branch pipeline.

[0011] Further, the steam distributor is used to distribute the required amount of steam of each steam branch pipe, and a pressure gauge and a thermometer are arranged thereon for monitoring the internal pressure and temperature of the steam distributor and feeding back the opening degree of the main pipe electric steam regulating valve.

[0012] Further, the steam branch pipe further comprises a steam straight pipe arranged in the cabin and a spiral steam coil pipe arranged outside the cabin, and the spiral steam coil pipe is arranged on the surface of the pipeline to be heated to heat and protect the pipeline.

[0013] Further, the spiral steam coil pipe needs to meet the following technical requirements:

[0014] 1) capable of resisting 250℃ high-temperature environment and -64℃ low-temperature environment;

[0015] 2) capable of resisting 4.0MPa high pressure;

[0016] 3) excellent resistance to seawater corrosion;

[0017] 4) excellent long-term service reliability, meeting the design life requirement.

[0018] Further, the spiral steam coil is set according to the parameters of the heated pipeline, the temperature difference between the inside and outside of the pipeline, the medium flow rate in the pipeline and the like.

[0019] Further, the steam booster pump inlet is provided with the pressure gauge and the thermometer for monitoring the steam pressure and temperature of the inlet pipeline; the steam booster pump outlet is provided with the thermometer, the pressure gauge and the flow meter for monitoring the steam pressure, temperature and flow of the outlet pipeline.

[0020] Further, the condensate pipeline is provided with a trap valve for controlling the on-off of the high-temperature condensate pipeline, and the trap valve is in a normally open state and is arranged at the lowest point of the pipeline to ensure that the pipeline heating device is dry and free of condensate.

[0021] Further, the high-temperature and high-pressure steam in the circulation passage has a temperature of > 250 DEG C and a pressure of > 4 MPa.

[0022] According to another aspect of the present application, a pipeline heating method suitable for large temperature change environment is provided, which comprises the following steps:

[0023] S100: when the environment is above 0 DEG C, the pipeline heating device is not operated;

[0024] S200: when the environment approaches -64 DEG C from 0 DEG C, the main pipeline electric steam regulating valve and each branch pipeline electric steam regulating valve are opened, the steam flow, temperature and pressure are adjusted through the steam distributor and the steam booster pump, the high-temperature and high-pressure steam is introduced into the spiral steam coil, and preheating is performed;

[0025] S300: when the environment is -64 DEG C, the pipeline heating device is continuously operated;

[0026] S400: when the environment approaches 0 DEG C from -64 DEG C, the high-temperature and high-pressure steam source is closed in advance to prevent the temperature of the medium in the heated pipeline from being too high;

[0027] S500: when the environment is above 0 DEG C, the main pipeline electric steam regulating valve and each branch pipeline electric steam regulating valve are closed, and the pipeline heating device is stopped.

[0028] Overall, compared with the prior art, the above technical scheme of the present application can achieve the following beneficial effects:

[0029] 1. A pipeline heating method suitable for large temperature environment, the steam flow, temperature and pressure in the spiral steam coil are adjusted by the steam distributor, electric steam regulating valve and steam booster pump, the pipeline outside the cabin can be preheated, continuously heated and stopped heating according to different temperature environment conditions, the temperature of the pipeline is uniformly and slowly changed, the pipeline is prevented from being damaged due to sharp temperature drop, and the medium in the pipeline under the large temperature environment is ensured to flow normally.

[0030] 2. A pipeline heating device suitable for large temperature environment, the steam flow, temperature and pressure in the spiral steam coil can be adjusted by the steam distributor, electric steam regulating valve and steam booster pump.

[0031] 3. A pipeline heating device suitable for large temperature environment, high-temperature condensed water is collected by the condensate system and then enters the high-temperature and high-pressure steam source, so that the condensed water is recycled, the energy utilization rate is improved, and the energy consumption and pollution are reduced.

[0032] 4. A pipeline heating device suitable for large temperature environment, the spiral steam coil laid outside the cabin on the heated pipeline is heated by the cabin system, and the device has the advantages of simple structure, convenient construction and convenient operation. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 It is a working principle schematic view of the pipeline heating device suitable for large temperature environment according to the embodiment of the present application;

[0034] Figure 2 It is a heating method schematic view of the pipeline heating device suitable for large temperature environment according to the embodiment of the present application;

[0035] In all the drawings, the same reference signs represent the same technical features, specifically: 1-high-temperature and high-pressure steam source, 2-steam distributor, 3-steam main pipe, 31-main pipe electric steam regulating valve, 4-steam branch pipe, 41-branch pipe electric steam regulating valve, 42-steam straight pipe, 43-spiral steam coil, 44-steam booster pump, 5-condensed water pipe, 51-drain valve, 6-condensed water system, 7-thermometer, 8-pressure gauge, 9-flow meter, 10-pipeline. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application. In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as they do not conflict with each other.

[0037] It should be noted that if the embodiments of the present application involve directionality indication (such as up, down, left, right, front, back, etc.), the directionality indication is only used to explain the relative position relationship, motion condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directionality indication also changes accordingly.

[0038] In addition, if the embodiments of the present application involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, nor within the protection scope required by the present application.

[0039] In this patent, the term "comprise", "include" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or equipment. Without more limitations, the elements defined by the statement "comprise" do not exclude the presence of other identical elements in the process, method, article or equipment including the elements.

[0040] When the ship is from a >0℃ environment to an extremely low temperature environment, the pipeline needs to be gradually heated, the temperature of the pipeline is uniformly and slowly changed, the material is gradually adapted to the change of temperature, and the pipeline is prevented from being damaged due to sharp temperature drop. In order to achieve the above purpose, the present application provides a pipeline heating device suitable for large temperature change environment,

[0041] Example 1:

[0042] In order to achieve the above purpose, as Figure 1As shown, the embodiment of the present application provides a pipeline heating device suitable for large temperature environment, comprising: a high temperature and high pressure steam source 1, a steam distributor 2, a steam main pipe 3, a steam branch pipe 4, a condensate pipe 5 and a condensate system 6, and a control device is installed on each pipeline. The inlet end of the steam distributor 2 is connected with the high temperature and high pressure steam source 1 in the cabin through the steam main pipe 3, the outlet end is connected with the steam branch pipe 4, the steam branch pipe 4 is connected with the condensate pipe 5 after entering the cabin from the cabin, and finally connected with the condensate system 6 in the cabin to form a circulating path; the high temperature and high pressure steam provided by the high temperature and high pressure steam source 1 is distributed to each steam branch pipe 4 in the steam distributor 2. The steam flow, temperature and pressure in the spiral steam coil are adjusted by the steam distributor, the electric steam regulating valve and the steam booster pump, the pipeline outside the cabin can be preheated, continuously heated and stopped heating according to different temperature environment conditions, the temperature of the pipeline is uniformly and slowly changed, the pipeline is prevented from being damaged due to sharp temperature drop, and the normal flow of medium in the pipeline in the large temperature environment is ensured.

[0043] The high temperature and high pressure steam source 1 provides high temperature and high pressure steam with a temperature of ≮250℃ and a pressure of ≮4MPa.

[0044] The steam distributor 2 is used for distributing the steam required by each steam branch pipe, and a pressure gauge 7 and a thermometer 8 are arranged on the steam distributor 2 for monitoring the internal pressure and temperature of the steam distributor 1, and the steam can be distributed according to the reading of the flow meter arranged at the outlet of the steam booster pump 44.

[0045] The steam main pipe 3 is provided with a main pipe electric steam regulating valve 31 for automatically controlling the opening and closing of the pipeline, and the valve opening degree is opened or closed according to the flow value read by the flow meter arranged at the outlet of the steam booster pump 44 and the pressure difference and temperature difference between the inlet and outlet of the steam booster pump 44.

[0046] The steam branch pipe 4 is provided with a branch pipe electric steam regulating valve 41 at the connection position with the outlet of the steam distributor 2 for automatically controlling the opening and closing of each branch pipeline. The valve opening degree is opened or closed according to the flow value read by the flow meter arranged at the outlet of the steam booster pump 44 and the pressure difference and temperature difference between the inlet and outlet of the steam booster pump 44.

[0047] The steam branch pipe 4 is composed of a steam straight pipe 42 arranged in the cabin and a spiral steam coil 43 arranged outside the cabin, the spiral steam coil 43 is laid on the surface of the heated pipeline 10 to heat and protect the pipeline, and the spiral steam coil 43 is continuously supplied with high temperature and high pressure steam to heat the protective pipeline outside the cabin.

[0048] The specific size, winding interval of the spiral steam coil 43 are set according to the parameters of the heated pipeline, temperature difference between inside and outside of the pipeline, medium flow rate in the pipeline, etc.; the spiral steam coil 43 needs to meet the following conditions:

[0049] 1) able to withstand 250℃ high temperature environment and -64℃ low temperature environment;

[0050] 2) able to withstand 4.0MPa high pressure;

[0051] 3) excellent seawater corrosion resistance;

[0052] 4) excellent long-term service reliability, meeting the design life requirement;

[0053] The steam direct pipe 42 is provided with a steam booster pump 44 for boosting the steam entering the spiral steam coil 43 and providing power to ensure that the pressure of the spiral steam coil on the surface of the terminal pipeline is ≮4MPa, preventing the spiral steam coil 43 from being frozen due to condensate. The steam booster pump 44 is provided with the pressure gauge 7 and the thermometer 8 at the inlet for monitoring the steam pressure and temperature of the inlet pipeline; the steam booster pump 44 is provided with the thermometer 7, the pressure gauge 8 and the flow meter 9 at the outlet for monitoring the steam pressure, temperature and flow of the outlet pipeline. The valve opening of the branch electric steam regulating valve 41 is opened or closed according to the flow value read by the flow meter at the outlet of the steam booster pump 44, the pressure difference and the temperature difference between the inlet and the outlet.

[0054] The condensate pipe 5 is provided with a trap 51 for controlling the on-off of the high-temperature condensate pipeline. The trap 51 is in a normally open state and is arranged at the lowest point of the pipeline to ensure that the pipeline heating device is dry without condensate. In a low-temperature environment, the steam releases heat and the temperature decreases to 105℃, the pressure decreases to 0.1MPa, then enters the cabin, forms high-temperature condensate in the condensate pipe 5, and the water in the condensate pipe is drained through the trap 51 under the action of gravity.

[0055] The condensate system 6 receives high-temperature high-pressure steam after temperature reduction, becomes high-temperature condensate, then enters the high-temperature high-pressure steam source, realizes cyclic utilization, improves energy utilization rate, and reduces energy consumption and pollution.

[0056] In the embodiment of the application, high-temperature high-pressure steam with a temperature ≮250℃ and a pressure ≮4MPa is provided by a high-temperature high-pressure steam source, and a spiral steam coil is used to heat the pipeline in a low-temperature environment outside the cabin. In order to avoid condensate in the spiral steam coil, a steam booster pump is arranged to ensure the steam pressure and temperature. In order to ensure that the steam entering the spiral steam coil is insufficient or excessive, a steam distributor is used for distribution. The steam distributor can be connected with multiple steam branches, and only two objects are listed as examples in the embodiment.

[0057] Embodiment 2:

[0058] As Figure 2 shown, the embodiment of the application provides a pipeline heating device method suitable for large temperature environment, and the pipeline heating device is used to realize the method. According to the change of the environment temperature, the method is mainly divided into four working conditions, and the specific working steps of the device under various working conditions are as follows:

[0059] S100: when the environment temperature is above 0℃, the pipeline heating device does not work;

[0060] S200: when the environment temperature changes from 0℃ to-64℃, the pipeline temperature is slowly changed according to the change of the environment temperature, the pipeline outside the cabin is preheated, further, the main pipe electric steam regulating valve is opened, high-temperature and high-pressure steam continuously enters the steam distributor, then the branch pipe electric steam regulating valve is opened, the steam enters the steam booster pump through the steam straight pipe in the cabin, and after being pressurized, the steam is sent to each spiral steam coil, the steam flow, temperature and pressure are adjusted through the steam distributor, the electric steam regulating valve and the steam booster pump, the high-temperature and high-pressure steam is introduced into the spiral steam coil, and the pipeline is gradually preheated;

[0061] S300: when the environment temperature is-64℃, the pipeline heating device continuously works; further, the high-temperature and high-pressure steam source continuously provides high-temperature and high-pressure steam with a temperature≮250℃ and a pressure≮4MPa, the values of the thermometer, the pressure gauge and the flowmeter are kept unchanged, and the pipeline is continuously heated;

[0062] S400: when the environment temperature changes from-64℃ to 0℃, the high-temperature and high-pressure steam source is closed in advance to prevent the temperature of the heated pipeline medium from being too high;

[0063] S500: when the environment temperature is above 0℃, the main pipe electric steam regulating valve and each branch pipe electric steam regulating valve are closed, and the pipeline heating device stops working. In the low-temperature environment, the steam releases heat and the temperature decreases to 105℃ and the pressure decreases to 0.1MPa, and then enters the cabin, is further cooled in the cabin to form high-temperature condensed water, and finally is connected to the condensed water system.

[0064] In this embodiment, the steam flow, temperature and pressure in the spiral steam coil are adjusted through the steam distributor, the electric steam regulating valve and the steam booster pump, the pipeline outside the cabin is preheated, continuously heated and stopped heating according to different temperature environment working conditions, the temperature of the pipeline is uniformly and slowly changed, the pipeline is prevented from being damaged due to sharp temperature drop, and the normal flow of the medium in the pipeline in the large temperature environment is ensured.

[0065] Embodiment 3: Another embodiment of the present application provides a pipeline heating device method suitable for large temperature change environment, and the pipeline heating device is used to realize the method, and the specific working steps are as follows:

[0066] S100: When the environment is above 0℃, the pipeline heating device does not work.

[0067] S200: When the environment changes from 0℃ to -32℃, the pipeline temperature is slowly changed according to the change of the environment temperature, the pipeline is preheated, further, the main pipe electric steam regulating valve is opened, high-temperature and high-pressure steam continuously enters the steam distributor, then the branch pipe electric steam regulating valve is opened, the steam enters the steam booster pump through the in-cabin steam straight pipe, after being pressurized, the steam is sent to each spiral steam coil, the steam flow, temperature and pressure in the spiral steam coil are adjusted through the steam distributor, the electric steam regulating valve and the steam booster pump, the high-temperature and high-pressure steam is introduced into the spiral steam coil, and the spiral steam coil is gradually preheated.

[0068] S300: When the environment is -32℃, the pipeline heating device continuously works, further, the high-temperature and high-pressure steam source continuously provides high-temperature and high-pressure steam with a temperature ≮250℃ and a pressure ≮4MPa, the values of the thermometer, the pressure gauge and the flowmeter are kept unchanged, and the pipeline is continuously heated.

[0069] S400: When the environment changes from -32℃ to 0℃, the high-temperature and high-pressure steam source is closed in advance to prevent the temperature of the heated pipeline medium from being too high.

[0070] S500: When the environment is above 0℃, the main pipe electric steam regulating valve and each branch pipe electric steam regulating valve are closed, and the pipeline heating device stops working. In the low-temperature environment, the steam releases heat and the temperature is reduced to 105℃ and the pressure is reduced to 0.1MPa, then the steam enters the cabin, is further cooled in the cabin to form high-temperature condensate, and finally is connected to the condensate system.

[0071] The minimum temperature environment is different according to different regions, the embodiment is only an embodiment under a temperature condition, the embodiment can be adjusted according to the environment temperature, the steam flow, temperature and pressure in the spiral steam coil are adjusted through the steam distributor, the electric steam regulating valve and the steam booster pump, and the pipeline is protected when the temperature changes from >0℃ to different low-temperature environments.

[0072] Those skilled in the art can easily understand that the above description is only a preferred embodiment of the present application, and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A pipe heating device suitable for use in a large temperature varying environment, characterized in that, The application relates to a high-temperature and high-pressure steam source (1), a steam distributor (2), a steam main pipe (3), a steam branch pipe (4), a condensate pipe (5) and a condensate system (6). The steam distributor (2) is connected with the high-temperature and high-pressure steam source (1) in the cabin through the steam main pipe (3) at the inlet end, is connected with the steam branch pipe (4) at the outlet end, is connected with the condensate pipe (5) after entering the cabin from the cabin and then entering the cabin again, and is finally connected with the condensate system (6) in the cabin to form a circulating path. The steam branch pipe (4) comprises a steam straight pipe (42) arranged in the cabin and a spiral steam coil pipe (43) arranged outside the cabin, the steam straight pipe (42) is provided with a steam booster pump (44) for boosting the steam entering the spiral steam coil pipe (43) and providing power, so that the spiral steam coil pipe (43) is prevented from being frozen due to condensate. The high-temperature and high-pressure steam provided by the high-temperature and high-pressure steam source (1) flows along the path, heats the pipeline in the low-temperature environment outside the cabin through the spiral steam coil pipe (43), adjusts the steam amount entering the spiral steam coil pipe (43) through the steam distributor (2), and ensures the steam pressure and temperature through the steam booster pump (44). The steam main pipe (3) is provided with a main pipe electric steam regulating valve (31) at the inlet of the steam distributor (2) for automatically controlling the opening and closing of the main pipeline, and each steam branch pipe (4) is provided with a branch pipe electric steam regulating valve (41) at the outlet for automatically controlling the opening and closing of each branch pipeline.

2. The pipe heating apparatus for use in a large temperature varying environment according to claim 1, wherein The steam distributor (2) is used for distributing the required steam amount of each steam branch pipe, is provided with a pressure gauge (7) and a thermometer (8) for monitoring the internal pressure and temperature of the steam distributor (2) and feeding back the opening degree of the main pipe electric steam regulating valve (31).

3. The pipe heating apparatus of claim 2, wherein, The steam branch pipe (4) further comprises a steam straight pipe (42) arranged in the cabin and a spiral steam coil pipe (43) arranged outside the cabin, and the spiral steam coil pipe (43) is arranged on the surface of the heated pipeline (10) to heat and protect the pipeline.

4. The pipe heating device for use in a large temperature varying environment according to any one of claims 1 to 3, characterized in that, The spiral steam coil pipe (43) needs to meet the following conditions:

5. The pipe heating apparatus of claim 4, wherein, 1) can resist 250 DEG C high-temperature environment and -64 DEG C low-temperature environment; 2) can resist 4.0 MPa high pressure; 3) has excellent seawater corrosion resistance; 4) has excellent long-term service reliability and meets the design life requirement. The specific size and winding spacing of the spiral steam coil pipe (43) are set according to the parameters of the heated pipeline, the temperature difference between the inside and outside of the pipeline, the medium flow rate in the pipeline and the like.

6. The pipe heating apparatus of claim 5, wherein, The steam booster pump (44) is provided with a pressure gauge (7) and a thermometer (8) at the inlet for monitoring the steam pressure and temperature of the inlet pipeline, and is provided with the thermometer (8), the pressure gauge (7) and a flowmeter (9) at the outlet for monitoring the steam pressure, temperature and flow rate of the outlet pipeline.

7. The pipe heating apparatus for use in large temperature varying environments of any one of claims 1-3, wherein, ​ 8. The pipe heating apparatus for use in large temperature varying environments of any one of claims 1-3, wherein, The condensate pipe (5) is provided with a drain valve (51) for controlling the on-off of the high-temperature condensate pipe, the drain valve (51) is in a normally open state and is arranged at the lowest point of the pipe to ensure that the pipe heating device is dry without condensate.

9. The pipe heating apparatus for use in large temperature varying environments of any one of claims 1-3, wherein, The temperature of the high-temperature and high-pressure steam in the circulation passage is ≮250℃, and the pressure is ≮4MPa.

10. A method for heating a pipeline in a large temperature variation environment, which is implemented by using the pipeline heating device for a large temperature variation environment according to any one of claims 1-9, characterized in that, The method comprises the following steps: S100: When the environment is above 0℃, the pipe heating device does not work; S200: When the environment approaches -64℃ from 0℃, the main pipe electric steam regulating valve and each branch pipe electric steam regulating valve are opened, the steam flow, temperature and pressure are adjusted through the steam distributor and the steam booster pump, the high-temperature and high-pressure steam is introduced into the spiral steam coil pipe, and preheating is performed; S300: When the environment is -64℃, the pipe heating device continuously works; S400: When the environment approaches 0℃ from -64℃, the high-temperature and high-pressure steam source is closed in advance to prevent the temperature of the medium in the heated pipe from being too high; S500: When the environment is above 0℃, the main pipe electric steam regulating valve and each branch pipe electric steam regulating valve are closed, and the pipe heating device stops working.

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