A multi-working-condition self-adaptive temperature regulating system and method for an expander

Abstract

The application provides an expansion machine multi-working condition adaptive temperature regulating system and method, relates to the control technical field of expansion machines, and the method comprises the following steps: controlling the input of sealing gas, obtaining a plurality of temperature groups of the sealing gas within the allowable temperature range of the sealing gas inlet temperature; selecting the inlet temperature of the sealing gas in the temperature group of the sealing gas as the inlet temperature of the sealing gas, continuously introducing the sealing gas, and then controlling the input of compressed gas; obtaining the actual temperature of the sealing gas reaching a specified point in the sealing gas chamber, obtaining the difference value, and judging whether the difference value exceeds a first preset value; when it is judged that the difference value exceeds the first preset value, selecting a temperature value higher than the one as the inlet temperature of the sealing gas, and then continuously judging whether the difference value exceeds the first preset value. The application embodiment provides an expansion machine multi-working condition adaptive temperature regulating system and method, which can reduce the risk generated when the equipment is started, stopped or the process pressure fluctuates sharply.

Description

Technical Field

[0001] This application relates to the field of expander control technology, specifically to an expander multi-condition adaptive temperature regulation system and method. Background Technology

[0002] In expanders, there is a risk of compressed gas leakage along the shaft. To mitigate this risk, a sealing gas system can be installed. This system provides a gas source with a slightly higher pressure than the compressed gas into the sealing gas chamber, reducing the risk of leakage. However, when using a sealing gas system, excessive pressure can cause some of the sealing gas to flow into the compressed gas chamber, contaminating it. Conversely, insufficient pressure can lead to backflow of high-pressure process gas into the sealing gas chamber. This not only contaminates the sealing system but also, once the sealing gas pressure recovers, the mixture generated within the sealing gas chamber may be pushed back into the compressed gas chamber, causing secondary contamination. These risks increase dramatically, especially during equipment startup, shutdown, or periods of drastic process pressure fluctuations. Summary of the Invention

[0003] This application provides an expander multi-condition adaptive temperature control system and method, which can reduce the risks caused by equipment start-up, shutdown, or drastic fluctuations in process pressure.

[0004] The specific technical solutions of the embodiments in this application are as follows:

[0005] On one hand, embodiments of this application provide a multi-condition adaptive temperature control method for an expander, including:

[0006] S10. Control the supply of sealing gas, and within the allowable temperature range of the sealing gas inlet temperature, obtain several temperature groups of the sealing gas. , The inlet temperature of the sealing gas. Intake temperature The theoretical temperature reaches the designated point in the sealed gas chamber and remains constant.

[0007] S20, Select the inlet air temperature from the sealing gas temperature group. As the inlet temperature of the sealing gas, the sealing gas is continuously introduced, and then the supply of compressed gas is controlled.

[0008] S30. Obtain the actual temperature of the sealing gas at a specified point in the sealing gas chamber. , obtain and The difference is determined, and it is determined whether the difference exceeds the first preset value;

[0009] S40. When it is determined that the difference exceeds the first preset value, select a value higher than the first preset value. A temperature value The inlet temperature of the sealing gas is used as the reference temperature, and the actual temperature of the sealing gas reaching a specified point in the sealing gas chamber is continuously obtained. and obtain and The difference is then used to determine whether the difference exceeds the first preset value.

[0010] S50, with As Repeat step S40 until the final difference does not exceed the first preset value;

[0011] S60. When it is determined that the difference does not exceed the first preset value, after a preset time, a further determination is made. Does the change value exceed the second preset value?

[0012] S70, if determined If the change value does not exceed the second preset value, the process ends.

[0013] S80, if determined If the change value exceeds the second preset value, then select the inlet temperature from the sealing gas temperature group. As Repeat steps S30-S70.

[0014] In some embodiments, S70, if determined If the change value does not exceed the second preset value, the process continues with the following steps:

[0015] S90, with As And repeat steps S30-S70.

[0016] In some embodiments, after step S70 and before step S90, the following steps are also included:

[0017] T10, Obtain the third temperature of the first region and the fourth temperature of the second region in the sealed gas chamber; the first region is closer to the compressed gas chamber than the second region.

[0018] T20. Determine whether the difference between the third temperature and the fourth temperature exceeds the third preset value;

[0019] T30. When it is determined that the difference between the third temperature and the fourth temperature exceeds the third preset value, the subsequent S90 steps continue.

[0020] In some embodiments, the following steps are also included:

[0021] K10, obtain the third temperature of the first region and the fourth temperature of the second region in the sealed air chamber; the first region is closer to the compressed air chamber than the second region;

[0022] K20. Determine whether the difference between the third temperature and the fourth temperature exceeds the third preset value;

[0023] K30. If the difference between the third temperature and the fourth temperature does not exceed the third preset value, then the process ends.

[0024] K40. When the difference between the third temperature and the fourth temperature exceeds the third preset value, the first region is heated.

[0025] In some embodiments, after step K40, the following steps are also included:

[0026] K50, repeat steps K10-K20, and when it is determined again that the difference between the third temperature and the fourth temperature exceeds the third preset value, increase the heating temperature for heating the first region.

[0027] In some embodiments, the method for obtaining the allowable temperature range value of the sealing gas inlet temperature includes the following steps:

[0028] S101. Obtain the dew point temperature of the sealing gas;

[0029] S102. Obtain the maximum permissible temperature of the sealed air chamber;

[0030] S103. Using the dew point temperature of the sealing gas as the minimum temperature and the highest permissible temperature of the sealing gas chamber as the maximum temperature, the permissible temperature range of the intake air temperature is obtained.

[0031] In some embodiments, the first preset value includes multiple values, with one preset value corresponding to each temperature group. In step S30, during the determination... and When the difference is calculated, according to Select a specific value and determine whether the difference exceeds [the specified value]. The first preset value corresponding to the temperature group.

[0032] In some embodiments, the method for obtaining the first preset value includes:

[0033]

[0034] in, The first preset value, The first preset parameter, The inlet temperature of the sealing gas. The inlet temperature of the compressed air. This refers to the heat exchange area of ​​the compressed air chamber and the sealed air chamber.

[0035] On the other hand, embodiments of this application provide an expander multi-condition adaptive temperature control system, including a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the expander multi-condition adaptive temperature control method of any of the above embodiments.

[0036] Compared with the prior art, the embodiments of this application have the following beneficial effects:

[0037] This application provides a multi-condition adaptive temperature control method for expanders. First, several temperature groups of the sealing gas are acquired to determine the inlet temperature and the corresponding theoretical temperature value at a specified point. Then, based on a comparison with the actual temperature value at the specified point, the method selectively increases the inlet temperature of the sealing gas within an allowable temperature range. This increases the pressure inside the sealing gas chamber, thereby reducing compressed gas leakage along the shaft. This is particularly effective during equipment startup, shutdown, or when process pressure fluctuates drastically, significantly reducing the risk of expansion gas leakage and improving equipment stability. Furthermore, after increasing the pressure inside the sealing gas chamber, monitoring continues for a period to minimize the subsequent impact of equipment fluctuations. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a schematic flowchart of an expander multi-condition adaptive temperature regulation method provided in some embodiments of this application;

[0040] Figure 2 This is a flowchart illustrating the multi-condition adaptive temperature control method for expanders provided in other embodiments of this application;

[0041] Figure 3 This is a flowchart illustrating a multi-condition adaptive temperature control method for an expander provided in some embodiments of this application. Detailed Implementation

[0042] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0043] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0044] "A and / or B" includes the following three combinations: A only, B only, and a combination of A and B.

[0045] The use of "applies to" or "configured to" in this application implies open and inclusive language, which does not exclude the applicability to or configuration to devices performing additional tasks or steps. Additionally, the use of "based on" implies openness and inclusivity, because processes, steps, calculations, or other actions "based on" one or more of the stated conditions or values ​​may in practice be based on additional conditions or values ​​beyond those stated.

[0046] In this application, the term "exemplary" is used to mean "used as an example, illustration, or description." Any embodiment described as "exemplary" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use this application. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that this application can be made without using these specific details. In other instances, well-known structures and processes are not described in detail to avoid obscuring the description of this application with unnecessary detail. Therefore, this application is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0047] On the one hand, please refer to Figure 1 This application provides a multi-condition adaptive temperature control method for an expander, comprising the following steps:

[0048] S10. Control the supply of sealing gas, and within the allowable temperature range of the sealing gas inlet temperature, obtain several temperature groups of the sealing gas. , The inlet temperature of the sealing gas. Intake temperature The theoretical temperature reaches the designated point in the sealed gas chamber and remains constant.

[0049] In S10, the allowable temperature range for the sealing gas inlet temperature can be selected based on the type of sealing gas and the type of expander. Different types of sealing gases have different dew point temperatures, and different types of expanders have different minimum and maximum temperatures they can withstand. The allowable temperature range for the sealing gas inlet temperature can be set based on the type of sealing gas and expander, or it can be preset based on manual experience. The designated point in the sealing gas chamber is usually located relatively far from the sealing gas inlet. It can be selected as a location near the rotating shaft or near the compressed gas chamber. Multiple designated points can be set in the sealing gas chamber, and one can be selected for activation at different times.

[0050] The sealing gas temperature group comprises multiple temperature sets. Each temperature set includes the inlet temperature of the sealing gas and the temperature at which the sealing gas reaches a designated point in the sealing gas chamber and remains constant at the current inlet temperature. During expander startup, shutdown, or drastic fluctuations in process pressure, situations may arise where the inlet temperature of the sealing gas remains constant, but the temperature at the designated point varies. Therefore, multiple measurements can be taken until the temperature at the designated point no longer changes under constant temperature. Then, the temperature corresponding to the designated point is obtained, thus forming a temperature set. The sealing gas temperature group can include two, three, or more temperature sets. Within temperature set t, the temperatures are arranged in ascending order of inlet temperature.

[0051] S20, Select the inlet air temperature from the sealing gas temperature group. As the inlet temperature of the sealing gas, the sealing gas is continuously introduced, and then the supply of compressed gas is controlled.

[0052] After obtaining multiple temperature groups of the sealing gas in S10, in S20, the inlet temperature of the sealing gas in one of the temperature groups is selected as the reference, the sealing gas is introduced, and then the supply of compressed gas is controlled. At the start of step S20, the equipment is in normal operation. The selected temperature group for the sealing gas can be any temperature group except the highest temperature group, the first temperature group, or any intermediate temperature group.

[0053] S30. Obtain the actual temperature of the sealing gas at a specified point in the sealing gas chamber. and obtain and The difference is calculated, and it is determined whether the difference exceeds the first preset value.

[0054] In step S30, the temperature of the sealing gas changes due to the initiation of the compressed gas introduction process. The temperature of the sealing gas will also change when it reaches the designated point in the sealing gas chamber, typically exceeding the theoretical temperature value. Lower. Therefore, under normal circumstances, i.e., when there is no leakage of compressed air into the sealed air chamber, the temperature of the sealed air in the sealed air chamber will drop at a higher rate due to heat exchange. Therefore, a first preset value is set to reduce false alarms in the system.

[0055] In some examples, the first preset value can be a dynamically changing value or a fixed value. When the first preset value is fixed, it can be set to different values ​​depending on the type of sealing gas, the area of ​​the sealing gas chamber, and the specific location of the specified point.

[0056] S40. When it is determined that the difference exceeds the first preset value, select a value higher than the first preset value. A temperature value The inlet temperature of the sealing gas is used as the reference temperature, and the actual temperature of the sealing gas reaching a specified point in the sealing gas chamber is continuously obtained. and obtain and The difference is then used to determine whether the difference exceeds the first preset value.

[0057] In S40, 'a' is a natural number greater than 0, and 'a' can take the values ​​1, 2, 3, 4, etc. In some examples, 'a' = 1. In specific examples... The temperature value is higher than Temperature value.

[0058] S50, with As Repeat step S40 until the final difference does not exceed the first preset value.

[0059] In S50, the final difference refers to the inlet temperature of the selected sealing gas, and the difference between the theoretical temperature at which the sealing gas at that temperature reaches the specified point and the actual temperature at which the sealing gas at that temperature reaches the specified point.

[0060] S60. When it is determined that the difference does not exceed the first preset value, after a preset time, a further determination is made. Does the change value exceed the second preset value?

[0061] S60 is a subsequent determination step following S40. That is, if the final difference determined by S40 does not exceed the first preset value, step S60 is executed. In other words, S50 is a cyclical step, and steps S60 and S50 are not directly related. The second preset value can be set based on the operator's experience. In some examples, it can be set to different values ​​depending on the type of sealing gas, the area of ​​the sealing gas chamber, and the specific location of the designated point.

[0062] S70, if determined If the change value does not exceed the second preset value, the process ends.

[0063] In S70, If the change value does not exceed the second preset value, it means that the expander's operating condition has reached a stable range, and the current cycle judgment phase ends. The above operation steps can be repeated after the corresponding signal appears or after a specific time period.

[0064] S80, if determined If the change value exceeds the second preset value, then select the inlet temperature from the sealing gas temperature group. As Repeat steps S30-S70.

[0065] In S80, b is a natural number greater than 0, and b can be 1, 2, 3, 4, etc.

[0066] In the above embodiments, several temperature groups of the sealing gas are first acquired to determine the sealing gas inlet temperature and the corresponding theoretical temperature value at a designated point. Then, based on a comparison with the actual temperature value of the sealing gas at the designated point, the pressure inside the sealing gas chamber is increased by selectively increasing the sealing gas inlet temperature within the allowable temperature range. This reduces compressed gas leakage along the shaft, especially during equipment startup, shutdown, or drastic fluctuations in process pressure, significantly reducing the risk of expansion gas leakage and improving equipment stability. Furthermore, after increasing the pressure inside the sealing gas chamber, monitoring continues for a period of time to minimize the subsequent impact of equipment fluctuations.

[0067] In some embodiments, step S70 further includes the following step:

[0068] S90, with As And repeat steps S30-S70.

[0069] S90 and S80 are not necessarily related; S90 is a cycle that occurs after the previous cycle has been completed. As Where m is a natural number greater than 0. This means lowering the inlet temperature of the sealing gas, and then repeating steps S30-S70. This setting allows for lowering the inlet temperature of the sealing gas while ensuring the expander operates normally—that is, preventing compressed gas leakage or ensuring the leakage rate is within a certain range. This reduces the impact of the sealing gas on the expander equipment, including reducing the risk of aging and damage.

[0070] In some of these embodiments, please refer to Figure 2 After step S70 and before step S90, the following steps are also included:

[0071] T10, obtain the third temperature of the first region and the fourth temperature of the second region in the sealed air chamber; the first region is closer to the compressed air chamber than the second region.

[0072] In T10, when the temperature group of the sealing gas is obtained, the designated point in the sealing gas chamber can be the first region, the second region, or other regions besides the first and second regions.

[0073] T20. Determine whether the difference between the third temperature and the fourth temperature exceeds the third preset value.

[0074] In T20, different third preset values ​​can be set depending on the type of sealing gas, the distance to the compressed gas chamber, and the distance between the first and second regions.

[0075] T30. When it is determined that the difference between the third temperature and the fourth temperature exceeds the third preset value, the subsequent S90 steps continue.

[0076] In the above embodiments, due to the influence of compressed gas, the temperature of the sealing gas in different areas of the sealed gas chamber is uneven. When the temperature difference between different areas is large, it is easy to cause rotor vibration, which may lead to the risk of rotor damage. At this time, the overall temperature in the sealed gas chamber can be reduced by actively reducing the inlet temperature of the sealing gas, so that the temperature in the sealed gas chamber can be closer to the temperature in the compressed gas chamber, thereby reducing the uneven temperature distribution in different areas of the sealed gas chamber caused by the heat exchange of compressed gas.

[0077] In other embodiments, please refer to Figure 3 The multi-condition adaptive temperature control method for expanders also includes the following steps:

[0078] K10: Obtain the third temperature of the first region and the fourth temperature of the second region in the sealed gas chamber; the first region is closer to the compressed gas chamber than the second region. Step K10 can be set up similarly to step T10, and will not be described again here.

[0079] K20: Determine whether the difference between the third and fourth temperatures exceeds a third preset value. Step K20 can be set similarly to step T20, and will not be described again here.

[0080] K30. When the difference between the third temperature and the fourth temperature does not exceed the third preset value, the process ends.

[0081] K40. When the difference between the third temperature and the fourth temperature exceeds the third preset value, the first region is heated.

[0082] Heating can be achieved by installing a heating element in the first region of the sealed gas chamber near the compressed gas chamber, and then controlling the activation of the heating element. Alternatively, heating can be achieved by installing a heating element on the outer surface of the sealed gas chamber and then heating the sealed gas through heat exchange.

[0083] In the above embodiments, in order to reduce the influence of compressed gas, the first region is heated to reduce the temperature difference in the sealed gas chamber, thereby reducing the uneven temperature distribution in various regions of the sealed gas chamber caused by the heat exchange of compressed gas.

[0084] In some embodiments, after step K40, the following steps are also included:

[0085] K50, repeat steps K10-K20, and when it is determined again that the difference between the third temperature and the fourth temperature exceeds the third preset value, increase the heating temperature for heating the first region.

[0086] In the above embodiments, after heating the first region, if the difference between the third and fourth temperatures exceeds a third preset value, the heating temperature of the first region can be further increased to reduce the temperature difference in the sealed gas chamber. In this embodiment, by heating the first region in stages, the temperature difference in the sealed gas chamber can be reduced. Furthermore, because of this staged heating method, the impact on the equipment caused by a significant temperature increase in the sealed gas chamber due to heating the first region can be minimized.

[0087] In some embodiments, the method for obtaining the allowable temperature range value of the sealing gas inlet temperature in step S10 includes the following steps:

[0088] S101. Obtain the dew point temperature of the sealing gas;

[0089] S102. Obtain the maximum permissible temperature of the sealed air chamber;

[0090] S103. Using the dew point temperature of the sealing gas as the minimum temperature and the highest permissible temperature of the sealing gas chamber as the maximum temperature, the permissible temperature range of the intake air temperature is obtained.

[0091] By setting the above embodiments, the maximum allowable temperature range of the sealing gas inlet temperature can be obtained, thereby supporting more sealing gas temperature groups and achieving precise control of the sealing gas temperature.

[0092] In some embodiments, the first preset value includes multiple values, with one preset value corresponding to each temperature group. In step S30, during the determination... and When the difference is calculated, according to Select a specific value and determine whether the difference exceeds [the specified value]. The first preset value corresponding to the temperature group.

[0093] Through the settings of the above embodiments, each selected inlet temperature of the sealing gas has a corresponding first preset value. In a specific example, when the type of compressed gas is determined, different inlet temperatures of the sealing gas will have different effects. By setting multiple first preset values, it is possible to better determine whether there is a leak in the compressed gas, thereby improving the stability of the equipment.

[0094] In some embodiments, the method for obtaining the first preset value includes:

[0095]

[0096] in, The first preset value, The first preset parameter, The inlet temperature of the sealing gas. The inlet temperature of the compressed air. This refers to the heat exchange area of ​​the compressed air chamber and the sealed air chamber.

[0097] By setting the parameters in the above embodiments, the corresponding first preset parameters can be obtained under different sealing gas inlet temperatures.

[0098] On the other hand, embodiments of this application provide an expander multi-condition adaptive temperature control system, including a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the expander multi-condition adaptive temperature control method described in any of the above embodiments.

[0099] This application provides a multi-condition adaptive temperature control method for expanders. First, based on the type of sealing gas, its dew point temperature, and the maximum permissible temperature of the sealing gas chamber, an allowable temperature range for the sealing gas inlet temperature is obtained. Then, based on this allowable temperature range, several temperature groups t for the sealing gas are acquired. For each temperature group, a first preset value is obtained based on the inlet temperature of the compressed gas, the heat exchange area of ​​the compressed gas chamber, and the sealing gas chamber.

[0100] The system controls and determines a specific value for the inlet temperature of the sealing gas. Then, based on this specific value, the sealing gas is introduced, and the system controls the supply of compressed gas. The system then obtains the difference between the actual temperature of the sealing gas at a specified point in the sealing gas chamber and the corresponding theoretical temperature. When the difference between the two exceeds a first preset value, the system increases the inlet temperature of the sealing gas until the difference between the two does not exceed the first preset value.

[0101] After a preset time, the actual temperature of the sealing gas at the designated point is determined. If the change in the actual temperature does not exceed the second preset value, it indicates that the equipment is operating stably, and the process ends. If the change in the actual temperature exceeds the second preset value, the inlet temperature of the sealing gas is increased again, and steps S30-S70 are repeated.

[0102] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A method for multi-condition self-adaptive temperature regulation of an expander, characterized in that, Comprising: S10, control the input of the sealing gas, in the allowable temperature range of the sealing gas inlet temperature, obtain several temperature groups of the sealing gas , is the inlet temperature of the sealing gas, is the inlet temperature reaches the specified point in the sealing gas chamber and maintains a constant theoretical temperature; S20, selecting an intake gas temperature in a temperature group of the seal gas As the intake gas temperature of the seal gas, the seal gas is continuously introduced, and then the introduction of the compressed gas is controlled; S30. Obtain the actual temperature of the sealing gas at a specified point in the sealing gas chamber. , obtain and The difference is determined, and it is determined whether the difference exceeds the first preset value; S40. When it is determined that the difference exceeds the first preset value, select a value higher than the first preset value. A temperature value The inlet temperature of the sealing gas is used as the reference temperature, and the actual temperature of the sealing gas reaching a specified point in the sealing gas chamber is also obtained. and obtain and The difference is then used to determine whether the difference exceeds the first preset value. S50, to As S40 is repeated until the final difference does not exceed the first preset value. S60, when determining that the difference does not exceed the first preset value, determining whether the change value exceeds a second preset value after a preset time the change value exceeds the second preset value. S70、if the determination If the change value does not exceed the second preset value, the process ends. S80、if the determination If the change value exceeds the second preset value, the temperature of the inlet gas in the temperature group of the sealing gas is selected As , repeat the steps S30-S70.

2. The multi-working-condition self-adaptive temperature regulation method of an expander according to claim 1, wherein, S70、if the determination If the change value does not exceed the second preset value, the method further comprises the following steps: S90, to As and repeat S30-S70 steps.

3. The multi-working-condition self-adaptive temperature regulation method of an expander according to claim 2, wherein, After S70 step, before S90 step, further comprising the following steps: T10, obtaining a third temperature of the first area and a fourth temperature of the second area in the sealed gas chamber; the first area is closer to the compressed gas chamber than the second area; T20, determining whether the difference between the third temperature and the fourth temperature exceeds a third preset value; T30, when it is determined that the difference between the third temperature and the fourth temperature exceeds the third preset value, then continue the subsequent S90 step.

4. The method of claim 1, wherein, Further comprising the following steps: K10, obtaining a third temperature of the first area and a fourth temperature of the second area in the sealed gas chamber; the first area is closer to the compressed gas chamber than the second area; K20, determining whether the difference between the third temperature and the fourth temperature exceeds a third preset value; K30, when it is determined that the difference between the third temperature and the fourth temperature does not exceed the third preset value, then end; K40, when it is determined that the difference between the third temperature and the fourth temperature exceeds the third preset value, heating the first area.

5. The multi-working-condition self-adaptive temperature regulation method of an expander according to claim 4, wherein, After K40 step, further comprising the following steps: K50, repeating K10-K20 steps, and when it is determined again that the difference between the third temperature and the fourth temperature exceeds the third preset value, increasing the heating temperature of heating the first area.

6. The multi-condition adaptive temperature regulation method of the expander of claim 1, wherein, The method for obtaining the allowable temperature range value of the sealed gas inlet temperature comprises the following steps: S101, obtaining the dew point temperature of the sealed gas; S102, obtaining the highest allowable temperature of the sealed gas chamber; S103, taking the dew point temperature of the sealed gas as the lowest temperature, and taking the highest allowable temperature of the sealed gas chamber as the highest temperature, to obtain the allowable temperature range value of the inlet temperature.

7. The multi-working-condition self-adaptive temperature regulation method of an expander according to claim 1, wherein, The first preset values include a plurality of values, each temperature group corresponding to a preset value. In step S30, when the difference between the temperature of the first temperature group and the temperature of the second temperature group is determined, whether the difference exceeds the first preset value corresponding to the temperature group in which the first temperature group is located is determined according to the specific value selected in step S20. With the difference between the temperature of the first temperature group and the temperature of the second temperature group is determined, whether the difference exceeds the first preset value corresponding to the temperature group in which the first temperature group is located is determined according to the specific value selected in step S20. With the difference between the temperature of the 8. The multi-working-condition self-adaptive temperature regulation method of an expander according to claim 7, wherein, The method for obtaining the first preset value comprises: wherein, is a first preset value, is a first preset parameter, is an inlet temperature of the seal gas, is an inlet temperature of the compressed gas, is a heat exchange area of the compressed gas chamber and the seal gas chamber.

9. A multi-condition adaptive temperature control system for an expander, characterized in that, The device comprises a memory and a processor, the memory stores a computer program, and the processor executes the computer program to realize the multi-working condition adaptive temperature regulation method of the expander in claim 1-8.

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