Thermal insulation device for cold and hot alternating working condition in refining dehydrogenation device

Abstract

The utility model provides a thermal insulation device for a cold-hot alternating working condition in a refining dehydrogenation device, which comprises a product gas dryer and a cold-hot alternating double-working-condition pipeline, a pipeline is arranged in the center of the interior of the cold-hot alternating double-working-condition pipeline, an anti-corrosion coating is coated on the surface of the pipeline, thermal insulation cotton is wrapped outside the anti-corrosion coating, and the thermal insulation cotton is coated outside the product gas dryer. The heat preservation cotton is wound in a sealed mode through a high-temperature-resistant fiber adhesive tape, the adhesive tape is wrapped with cold insulation cotton, a connector gap is sealed through sealant, and binding is conducted through heat preservation leather and a packing belt after sealing is completed. By adopting pipeline protection measures, corrosion signs are not easy to appear on the surfaces of the pipeline and the equipment, and the device has a remarkable anti-corrosion effect and has the characteristics of simplicity in operation, easiness in implementation, easiness in monitoring and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of propane and isobutane mixed dehydrogenation, in particular to a heat preservation device for cold and hot alternating working conditions in a refining and dehydrogenation device. Background Art

[0002] The function of the existing dehydrogenation device product gas dryer is to remove a small amount of water in the product gas and regularly regenerate the adsorbent to achieve the dehydration effect. However, this system operates in a dual working condition, with a high-temperature working condition of 220°C during the regeneration stage and a low-temperature working condition of 15°C during the adsorption stage. The process operating temperature changes cyclically, and the continuous evaporation and condensation of moisture in the insulation layer promote the occurrence of corrosion under the insulation layer, forming corrosion points on the surface of the equipment (pipelines and dryers), resulting in damage to the equipment body. During the actual operation of the device, obvious rust flakes were monitored on the surface of the equipment and pipelines, proving that corrosion occurred. Summary of the Invention

[0003] In view of the above-mentioned technical problems, a heat preservation device for cold and hot alternating working conditions in a refining and dehydrogenation device is provided. The utility model changes the conventional pipeline heat preservation method and uses a method combining cold insulation and heat preservation to protect the pipeline under cold and hot dual working conditions. This method includes heat preservation cotton, cold insulation cotton, sealant, and heat preservation skin, etc. First, a layer of heat preservation cotton is wrapped, then a layer of cold insulation cotton is added outside the heat preservation cotton, and the outermost layer is sealed with sealant to prevent moisture from entering the insulation layer and causing corrosion. No corrosion signs were found through regular inspection through the observation port according to the operating conditions of the dryer.

[0004] The technical means adopted by the utility model are as follows:

[0005] A heat preservation device for cold and hot alternating working conditions in a refining and dehydrogenation device, comprising: a product gas dryer, a cold and hot alternating dual working condition pipeline, wherein:

[0006] The device includes two product gas dryers, which are connected by a pipeline between the first product gas dryer and the second product gas dryer, and a product gas dryer middle water analyzer is arranged on the pipeline; the two product gas dryers are set as one open and one standby, and are switched and controlled by a sequence controller;

[0007] The cold and hot alternating dual working condition pipeline includes a first cold and hot alternating dual working condition pipeline and a second cold and hot alternating dual working condition pipeline. The first cold and hot alternating dual working condition pipeline is arranged at the lower input and output ports of the product gas dryer, and the second cold and hot alternating dual working condition pipeline is arranged at the upper input and output ports of the product gas dryer; the cold and hot alternating dual working condition pipeline is used for heat preservation and cold insulation of the gas input and output by the product gas dryer.

[0008] Furthermore, the inner center of the hot and cold alternating dual-condition pipeline is a pipeline, on the surface of which an anti-corrosion coating is applied. The anti-corrosion coating is wrapped with heat-insulating cotton, and the heat-insulating cotton is sealed and wound with high-temperature resistant fiber tape. The tape is wrapped with cold-insulating cotton, and the interface gap is sealed with sealant. After sealing, it is bundled with heat-insulating skin and packing tape.

[0009] Furthermore, one end of the first hot and cold alternating dual-condition pipeline is connected to the lower input and output ports of the product gas dryer, and the other end is connected to pipelines a, b, and c, where:

[0010] Pipeline a is a product gas material pipeline, which is connected to the liquid separation tank of the product gas dryer. The product gas phase material enters the product gas dryer from bottom to top through the liquid separation tank of the product gas dryer;

[0011] Pipeline b is a regenerated regeneration gas discharge pipeline, which is connected to the regeneration gas discharge of the product heat exchanger and is cooled by exchanging heat with the new regeneration gas through the product heat exchanger;

[0012] Pipeline c is a pipeline for backwashing the regeneration gas after the regeneration of the product gas dryer is completed, and is connected to the regeneration gas dryer.

[0013] Furthermore, one end of the second hot and cold alternating dual-condition pipeline is connected to the upper input and output ports of the product gas dryer, and the other end is connected to pipelines d, e, and f, where:

[0014] Pipeline d is connected to the cold box and is used to input the material into the cold box after removing moisture;

[0015] Pipeline e is connected to the inlet liquid separation tank of the product gas dryer and the regeneration gas steam heater of the product gas dryer, and is used to input the regeneration gas into the product gas dryer;

[0016] Pipeline f is a pressure relief pipeline, which is connected to the second-stage suction tank of the product gas compressor and is used to relieve the pressure of the material to the second-stage suction tank of the product gas compressor during the switching of the product gas dryer.

[0017] Furthermore, a temperature monitoring device and a pressure detection device are provided on the hot and cold alternating dual-condition pipeline to detect the temperature and pressure of the regeneration gas at the outlet of the product gas dryer.

[0018] Furthermore, a product gas dryer outlet water analyzer is provided at the outlet of pipeline d to monitor the water content in the product gas.

[0019] Furthermore, a corrosion detection device is provided on the hot and cold alternating dual-condition pipeline to monitor the corrosion condition of the hot and cold alternating dual-condition pipeline in real time.

[0020] Compared with the prior art, the utility model has the following advantages:

[0021] The heat preservation device for the cold and hot alternating working conditions in the refining dehydrogenation device provided by the present utility model, after adopting the pipeline protection measures of the invented system, no corrosion signs have appeared on the surfaces of the pipelines and equipment, showing significant anti-corrosion effects and proving its good practicability; meanwhile, it has the characteristics of simple operation, easy implementation, and easy monitoring.

[0022] Based on the above reasons, the present utility model can be widely promoted in the technical field of propane and isobutane mixed dehydrogenation. Brief Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 It is a schematic structural diagram of the heat preservation device for the cold and hot alternating working conditions in the refining dehydrogenation device of the present utility model.

[0025] Figure 2 It is a schematic structural diagram of the cold and hot alternating dual-working-condition pipeline in the present utility model.

[0026] In the figure: 1. Product gas dryer; 1-1. First product gas dryer; 1-2. Second product gas dryer; 2. Cold and hot alternating dual-working-condition pipeline; 2-1. First cold and hot alternating dual-working-condition pipeline; 2-2. Second cold and hot alternating dual-working-condition pipeline; 3. Corrosion detection device; 4. Temperature monitoring device; 5. Pressure detection device; 6. Product gas dryer outlet water analyzer; 7. Second-stage suction tank of product gas compressor; 8. Third-stage outlet tank of product gas compressor; 9. Product gas dryer liquid separation tank; 10. Product gas dryer regeneration liquid separation tank; 11. Product gas dryer inlet liquid separation tank; 12. Product heat exchanger; 13. Product gas dryer regeneration gas steam heater; 14. Product gas dryer regeneration gas cooler; 15. Regeneration gas dryer. Detailed Embodiments

[0027] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The following will refer to the drawings and combine the embodiments to detail the present invention.

[0028] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are only a part rather than all of the embodiments of the present invention. The description of at least one exemplary embodiment is actually only illustrative and in no way restricts the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0029] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments of the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0030] Unless otherwise specifically stated, the relative arrangements, numerical expressions and values of the components and steps set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0031] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are generally based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus should not be construed as limiting the scope of protection of the present invention. The orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0032] For ease of description, spatial relative terms, such as "above", "over", "on the upper surface", "upper", etc., may be used herein to describe the spatial positional relationship of a device or feature shown in the figures with respect to other devices or features. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "over" other devices or structures will then be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both orientations of "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the corresponding explanations will be made for the spatial relative descriptions used herein.

[0033] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of differentiating the corresponding components. Without further statement, the above terms have no special meaning, and thus should not be construed as limiting the protection scope of the present invention.

[0034] As Figure 1 shown, the present utility model provides a thermal insulation device for the hot and cold alternating working conditions in a refining dehydrogenation device, including: a product gas dryer 1 and a hot and cold alternating dual-condition pipeline 2, wherein:

[0035] The device includes two product gas dryers 1. The first product gas dryer 1-1 and the second product gas dryer 1-2 are connected by a pipeline. The two product gas dryers 1 are arranged in a one-on-one standby mode and are switched and controlled by a sequence controller; that is, online → offline → material pressure relief → regeneration pressurization → purging → heating → cooling → regeneration pressure relief → material pressurization → small parallel → parallel interlocking → switching → online for switching operations to complete the production task.

[0036] During implementation, the product gas dryer 1 is a product gas dryer of a conventional dehydrogenation device.

[0037] The hot and cold alternating dual-condition pipeline 2 includes a first hot and cold alternating dual-condition pipeline 2-1 and a second hot and cold alternating dual-condition pipeline 2-2. The first hot and cold alternating dual-condition pipeline 2-1 is arranged at the lower input and output ports of the product gas dryer 1, and the second hot and cold alternating dual-condition pipeline 2-2 is arranged at the upper input and output ports of the product gas dryer 1; the hot and cold alternating dual-condition pipeline 2 is used to keep the gas input and output by the product gas dryer 1 thermally insulated and cold-insulated.

[0038] During specific implementation, as a preferred implementation method, the inner center of the dual-condition hot and cold alternating pipeline 2 is a pipeline. An anti-corrosion coating is applied on the pipeline surface, and heat-insulating cotton is wrapped outside the anti-corrosion coating. The heat-insulating cotton is hermetically wound with high-temperature-resistant fiber tape. Cold-insulating cotton is wrapped outside the tape, and the interface gaps are sealed with sealant. After sealing, it is tied up with heat-insulating skin and packing tape.

[0039] During implementation, anti-corrosion paint is applied to the outer wall and welds of the pipeline. Legs are provided at the contact points between the pipeline and the steel structure. After anti-corrosion treatment, the pipeline is wrapped with a layer of aluminosilicate cotton needle felt \(\delta = 50mm, 128kg / m\) 3 At \(1000^{\circ}C\), it is then hermetically wound with high-temperature-resistant aluminum foil tape \(\ 50*0.05mm\). Under the condition of ensuring good sealing performance, a layer of nitrile rubber foam material \(\delta = 25mm\), non-combustible grade B1 is tightly wrapped around the pipeline with completed heat insulation again. When wrapping the nitrile rubber, all interface gaps are sealed with flexible cold-insulating binder to ensure that there is no possibility of air contacting the pipeline anymore. Finally, it is tied up with special heat-insulating skin and packing tape to achieve a perfect fit. For the connection between the pipeline pipe support and the valve flange, the same protective layer as the pipeline is used for covering and ensuring no gap in the middle, which can achieve the heat insulation and cold insulation effects of the dual-condition hot and cold alternating pipeline in the existing device.

[0040] In order to increase the sealing performance of the dual-condition hot and cold alternating pipeline and enhance the anti-corrosion performance, after the outer wall of the pipeline is safely polished, high-temperature-resistant anti-corrosion paint is applied comprehensively and evenly in all directions according to the technical standard of the pipeline anti-corrosion layer, fundamentally increasing the anti-corrosion strength; in order to facilitate the heat insulation and cold insulation sealing performance of the pipeline, marks are made on the lap gaps of the heat insulation materials on the wound high-temperature-resistant aluminum foil tape, and all cold-insulating layers are stagger-lapped with this marked position to ensure that any position is covered in a staggered manner, enhancing the tightness.

[0041] Through continuous tracking, it is found that after the invention protection measures are adopted for the pipeline system annotated in the attached drawings, the device has been running stably for 2 years, and no signs of equipment surface corrosion and pipeline thinning are found during monitoring, showing a significant anti-corrosion effect and proving its good practicality; at the same time, it has the characteristics of simple operation, easy implementation, and easy monitoring.

[0042] During specific implementation, as a preferred implementation method, one end of the first dual-condition hot and cold alternating pipeline 2-1 is connected to the lower input and output ports of the product gas dryer 1, and the other end is connected to pipelines a, b, and c, where:

[0043] The pipeline a is a product gas material pipeline, which is connected to the product gas dryer liquid separation tank 9. The product gas phase material enters the product gas dryer 1 from bottom to top through the product gas dryer liquid separation tank 9; after adsorbing and removing the moisture in the product gas for 40 hours, during which the pipeline temperature is about \(15^{\circ}C\), the product gas with removed moisture enters the cold box through the upper pipeline of the product gas dryer 1.

[0044] The pipeline b is the regenerated re - gas discharge pipeline. After the re - gas discharged from the product heat exchanger 12 is cooled by heat exchange with the new re - gas through the product heat exchanger 12, it is then cooled by cooling water in the dryer re - gas cooler and sent back to the dryer regeneration tank.

[0045] The pipeline c is the pipeline for back - blowing after the regeneration of the re - gas in the product gas dryer 1, and it is connected to the re - gas dryer 15.

[0046] In specific implementation, as a preferred implementation mode, one end of the second cold - hot alternating dual - working - condition pipeline 2 - 2 is connected to the upper input - output port of the product gas dryer 1, and the other end is connected to pipelines d, e, and f, where:

[0047] The pipeline d is connected to the cold box and is used to input the material into the cold box after removing moisture.

[0048] The pipeline e is connected to the inlet liquid - separation tank 11 of the product gas dryer and the re - gas steam heater 13 of the product gas dryer, and is used to input the re - gas into the product gas dryer 1. During regeneration, the required temperature change of the re - gas depends on special steps in the regeneration cycle, and the temperature is controlled by a decoupling controller. After the re - gas propane gas is heat - exchanged through the product heat exchanger 12, it is further heated to about 232°C by superheated medium - pressure steam in the re - gas steam heater 13 of the product gas dryer for about 24 hours, and then enters the product gas dryer 1 from top to bottom for regeneration.

[0049] The pipeline f is the pressure - relief pipeline, which is connected to the second - stage suction tank 7 of the product gas compressor and is used to relieve the pressure of the material to the second - stage suction tank 7 of the product gas compressor during the switching of the product gas dryer 1.

[0050] In specific implementation, as a preferred implementation mode, a temperature monitoring device 4 and a pressure detection device 5 are provided on the first cold - hot alternating dual - working - condition pipeline 2 - 1, which are used to detect the temperature and pressure of the re - gas at the outlet of the product gas dryer 1.

[0051] Adjust the heating rate of the re - gas entering the dryer according to the temperature monitoring device and judge the regeneration situation of the desiccant to keep the re - gas temperature stable within a suitable range.

[0052] In specific implementation, as a preferred implementation mode, a product gas dryer outlet water analyzer 6 is provided at the outlet of the pipeline d, which is used to monitor the water content in the product gas to ensure that the water content in the product gas is within the qualified range.

[0053] In specific implementation, as a preferred implementation mode, a corrosion detection device 3 is provided on the cold - hot alternating dual - working - condition pipeline 2, which is used to monitor the corrosion situation of the cold - hot alternating dual - working - condition pipeline 2 in real time to ensure the long - term operation of the device.

[0054] Embodiment

[0055] As Figure 1 shown, the utility model provides a thermal insulation device for the cold and hot alternating working conditions in a refining dehydrogenation device. The liquid phase and gas phase of the product in the outlet tank 8 of the third stage of the product gas compressor are separated in the gas-liquid separator 9 of the product gas dryer. The liquid phase is discharged to the outlet tank 8 of the third stage of the product gas compressor, and the gas phase is dried by the product gas dryer 1 and enters the low-temperature recovery section.

[0056] Main equipment of the dryer and dryer regeneration system: product gas dryer 1, product gas dryer regeneration liquid separation tank 10, product heat exchanger 12, product gas dryer regeneration gas steam heater 13, product gas dryer regeneration gas cooler 14, and product gas dryer inlet liquid separation tank 11.

[0057] Each product gas dryer 1 includes a main bed layer and a protective bed, two desiccant bed layers. A humidity analyzer is equipped on the main bed layer to display that the humidity reaches the "front peak". The protective bed prevents the humidity of the dryer from penetrating. When the "wet gas" front peak just reaches the analysis probe, it means that the water in the main bed layer is saturated, and the dryer should be switched at the same time. The valves for switching the dryer from the operation mode to the regeneration mode and then back to the operation mode are automatically operated by the dryer program.

[0058] The required temperature change of the regeneration gas depends on the special steps in the regeneration cycle, and the temperature is controlled by a decoupling controller. The regenerated propane gas from the product gas dryer 1 is heated by the product heat exchanger E-2022 and then further heated to 232°C by superheated medium-pressure steam in the product gas dryer regeneration gas steam heater 13. The number of product gas dryer regeneration gas steam heaters 13 is determined by the equipment load and can be one or more.

[0059] During regeneration, the regeneration gas coming out of the propane raw material vaporization tank is first cooled by exchanging heat with the fresh regeneration gas through the product heat exchanger 12 after passing through the regenerator dryer, and then cooled by cooling water in the dryer regeneration gas cooler, and then sent back to the dryer regeneration tank.

[0060] Regeneration is the process of heating the desiccant to a high enough temperature to release moisture, while purging the bed to displace the released water and steam. An analyzer is set on the reactor to measure the water content in or at the outlet of the dryer, and it is confirmed whether the dryer is regenerated according to the size of the water content. Based on past experience and comparison with the use of a moisture analyzer, a fixed use cycle for the regeneration of the product gas dryer is set.

[0061] After the dryer is saturated with water, it is isolated, and the dryer is depressurized to the second-stage suction tank 7 of the product gas compressor to recover the product gas. Before starting the regeneration, a small amount of regeneration gas is passed through the bed for purging. The flow rate and temperature of the total regeneration gas to the dryer are controlled by the "decoupler" function method. Usually, this control is achieved by changing the opening degrees of the cold and hot regeneration gas control valves to control the flow rate and temperature. After the dryer is regenerated, the dryer is cooled by adjusting the cold and hot regeneration gases while maintaining the total flow rate. Subsequently, the regenerated dryer is pressurized through the bypass of the outlet valve of the regenerated dryer and placed in a standby state with a small amount of flow passing through, operating in parallel with the on-line dryer.

[0062] As described above, the regeneration process is completed through sequence control interlocks. Both the regeneration process and the on-line process enter the dryer through pipelines under cold and hot alternating conditions.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An insulation device for the hot and cold alternating working conditions in a refining dehydrogenation unit, characterized in that include: Product gas dryer (1), hot and cold alternating dual-mode pipeline (2), wherein: The device comprises two product gas dryers (1), wherein the first product gas dryer (1-1) and the second product gas dryer (1-2) are connected via a pipeline, and a product gas dryer middle water analyzer (6) is provided on the pipeline; the two product gas dryers (1) are arranged in a one-on and one-standby configuration, and are switched and controlled by a sequence controller; The hot and cold alternating dual-condition pipeline (2) comprises a first hot and cold alternating dual-condition pipeline (2-1) and a second hot and cold alternating dual-condition pipeline (2-2), wherein the first hot and cold alternating dual-condition pipeline (2-1) is arranged at the lower input and output ports of the product gas dryer (1), and the second hot and cold alternating dual-condition pipeline (2-2) is arranged at the upper input and output ports of the product gas dryer (1); the hot and cold alternating dual-condition pipeline (2) is used to keep the gas input and output of the product gas dryer (1) hot and cold; The inner center of the hot and cold alternating dual-mode pipeline (2) is a pipeline, an anti-corrosion coating is applied on the surface of the pipeline, the anti-corrosion coating is wrapped with thermal insulation cotton, the thermal insulation cotton is sealed with a high-temperature resistant fiber tape, the tape is wrapped with cold insulation cotton, and the interface gap is sealed with sealant, and after the sealing is completed, it is bundled with thermal insulation leather and strapping tape.

2. The thermal insulation device for the cold and hot alternating working conditions in the refining dehydrogenation device according to claim 1, wherein, One end of the first hot and cold alternating dual-mode pipeline (2-1) is connected to the lower input and output ports of the product gas dryer (1), and the other end is connected to pipelines a, b, and c, wherein: The pipeline a is a product gas material pipeline, connected to the product gas dryer separator (9), and the product gas phase material enters the product gas dryer (1) from the bottom to the top through the product gas dryer separator (9); The pipeline b is a regeneration gas discharge pipeline after regeneration, which is connected to the product heat exchanger (12). After the regeneration gas is discharged, it passes through the product heat exchanger (12) and exchanges heat with the new regeneration gas for cooling; The pipeline c is a pipeline for back-flushing the regeneration gas after the regeneration of the product gas dryer (1) is completed, and is connected to the regeneration gas dryer (15).

3. The heat preservation device for hot and cold alternating working conditions in a refining and dehydrogenation device according to claim 1, characterized in that: One end of the second hot and cold alternating dual-mode pipeline (2-2) is connected to the upper input and output ports of the product gas dryer (1), and the other end is connected to pipelines d, e, and f, wherein: The pipeline d is connected to the cold box and is used to remove moisture from the material and then input it into the cold box; The pipeline e is connected to the product gas dryer inlet separator (11) and the product gas dryer regeneration gas steam heater (13), and is used to input the regeneration gas into the product gas dryer (1); The pipeline f is a pressure relief pipeline connected to the second stage suction tank (7) of the product gas compressor and is used to relieve the pressure of the material to the second stage suction tank (7) of the product gas compressor during the switching of the product gas dryer (1).

4. The thermal insulation device for the cold and hot alternating working conditions in the refining dehydrogenation device according to claim 1, characterized in that, The hot and cold alternating dual-mode pipeline (2) is provided with a temperature monitoring device (4) and a pressure detection device (5) for detecting the temperature and pressure of the regenerated gas at the outlet of the product gas dryer (1).

5. The heat preservation device for hot and cold alternating working conditions in a refining and dehydrogenation device according to claim 3, characterized in that: The outlet of the pipeline d is provided with a product gas dryer outlet water analyzer (6) for monitoring the water content in the product gas.

6. The heat preservation device for hot and cold alternating working conditions in a refining and dehydrogenation device according to claim 1, characterized in that: The hot-cold alternating dual-mode pipeline (2) is provided with a corrosion detection device (3) for real-time monitoring of the corrosion condition of the hot-cold alternating dual-mode pipeline (2).

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