Warm-up system and method for high-temperature steam compressor

Abstract

The invention provides a warming-up system and method for a high-temperature steam compressor. The warm-up system comprises: a steam source adapted to provide source steam; the compressor comprises an input end and an output end, the input end is suitable for receiving input end steam, the input end steam is from source steam of the steam source, the output end is suitable for discharging output end steam, and the temperature and / or pressure of the output end steam is higher than that of the input end steam; the turning system is connected with the compressor, the turning system is configured to drive the compressor to operate at a warm-up rotating speed in a warm-up stage before the normal working condition, the warm-up rotating speed is smaller than the working rotating speed of the compressor under the normal working condition, and the warm-up stage comprises a stage that the wall surface temperature of the compressor is smaller than a warm-up temperature threshold value. The heating efficiency of the high-temperature steam compressor can be improved on the basis of lower cost, so that the safety and the reliability of a compressor unit are improved.

Description

Technical Field

[0001] The present application mainly relates to the field of high-temperature steam compressors, and in particular to a warm-up system and method for a high-temperature steam compressor. Background Art

[0002] Steam compressor is a key equipment in heat recovery system that compresses the generated steam to increase the temperature and pressure of steam. It can be widely used in chemical, pharmaceutical, electric power, heating and other industries. At present, the industry has put forward higher requirements on the efficiency of steam compressors, and the steam parameters are getting higher and higher, which brings higher difficulty to the start and stop operation of steam compressors. Summary of the invention

[0003] The technical problem to be solved by the present application is to provide a warm-up system and method for a high-temperature steam compressor, which can improve the warm-up efficiency of the high-temperature steam compressor at a relatively low cost, thereby improving the safety and reliability of the compressor unit.

[0004] To solve the above technical problems, the present application provides a warm-up system for a high-temperature steam compressor, comprising: a steam source, suitable for providing source steam; a compressor, comprising an input end and an output end, the input end being suitable for receiving input end steam, the input end steam coming from the source steam of the steam source, the output end being suitable for discharging output end steam, the temperature and / or pressure of the output end steam being higher than that of the input end steam; and a cranking system, connected to the compressor, the cranking system being configured to drive the compressor to operate at a warm-up speed in a warm-up stage before normal operating conditions, the warm-up speed being lower than the operating speed of the compressor under the normal operating conditions, wherein the warm-up stage includes a stage in which the wall temperature of the compressor is lower than a warm-up temperature threshold.

[0005] Optionally, the turning system includes a turning motor, and the turning motor has a rotation speed ranging from 20 rpm to 50 rpm.

[0006] Optionally, the cranking motor is configured to automatically disconnect from the compressor after the speed of the compressor increases from the warm-up speed to a speed threshold.

[0007] Optionally, the compressor further includes a main motor, and the cranking system includes a frequency converter, wherein the frequency converter is connected to the main motor of the compressor.

[0008] Optionally, the inverter is configured to operate the compressor at a warm-up speed during the warm-up phase, and to operate the compressor at the operating speed under the normal operating condition.

[0009] Optionally, a heating device is further included, connected between the steam source and the compressor, and the heating device is configured to heat the source steam to increase the temperature of the source steam.

[0010] Optionally, the heating device comprises an electric heater or a heat exchanger having a heat source.

[0011] Optionally, the warm-up system further comprises a pre-heating regulating valve connected between the heating device and the compressor, and the opening of the pre-heating regulating valve is suitable for being controlled to adjust the pressure of the steam at the input end.

[0012] Another aspect of the present application also proposes a warm-up method for a high-temperature steam compressor, comprising the following steps: providing source steam through a steam source; receiving input end steam through the input end of the compressor, the input end steam coming from the source steam of the steam source; in the warm-up stage before normal operating conditions, driving the compressor to operate at a warm-up speed through a cranking system, the warm-up speed being lower than the operating speed of the compressor under the normal operating conditions; discharging output end steam through the output end of the compressor, the temperature and / or pressure of the output end steam being higher than that of the input end steam; and continuously executing the above steps until the compressor meets the warm-up end condition, the warm-up end condition including that the wall temperature of the compressor reaches the warm-up temperature threshold.

[0013] Optionally, the method further includes heating the source steam by a heating device during the warm-up phase to increase the temperature of the source steam, wherein the heating device is connected between the steam source and the compressor.

[0014] Optionally, the method further comprises adjusting the pressure of the steam at the input end by controlling the opening of a preheating regulating valve during the warm-up phase, wherein the preheating regulating valve is connected between the heating device and the compressor.

[0015] Optionally, at least a portion of the output end steam enters the compressor again through the input end, and the warm-up stage includes a first warm-up stage and a second warm-up stage. The warm-up temperature threshold includes a first temperature threshold and a second temperature threshold, and the first temperature threshold is less than the second temperature threshold, wherein, in the first warm-up stage, the temperature of the source steam is increased from the initial temperature to the first temperature threshold through the heating device; in the second warm-up stage, the temperature of the source steam is increased from the first temperature threshold to the second temperature threshold after passing through the compressor and undergoing one or more cycles.

[0016] Compared with the prior art, the present application has the following advantages: the warm-up system and method of the high-temperature steam compressor proposed in the present application can optimize the warm-up process of the high-temperature steam compressor, improve the warm-up efficiency of the high-temperature steam compressor on the basis of lower cost, thereby reducing the problem of uneven deformation caused by excessive temperature difference between the rotating parts and the stator parts of the compressor, and improving the safety and reliability of the system. In addition, in the preferred implementation, the pre-warming temperature and pressure can be adjusted according to the operating parameters of the unit to perform warm-up in different stages. In addition, in different embodiments, the components can be reasonably configured according to the process system of the unit to reduce the construction cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are included to provide a further understanding of the present application. They are included and constitute a part of the present application. The accompanying drawings illustrate embodiments of the present application and together with the present specification serve to explain the principles of the present application. In the accompanying drawings:

[0018] Figure 1 This is a system block diagram of a warm-up system of a high-temperature steam compressor according to an embodiment of the present application;

[0019] Figure 2 and Figure 3 It is a system block diagram of a warm-up system of a high-temperature steam compressor according to different embodiments of the application;

[0020] Figure 4 It is a flow chart of a warm-up method for a high-temperature steam compressor according to an embodiment of the present application. DETAILED DESCRIPTION

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for the description of the embodiments. Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, the present application can also be applied to other similar scenarios based on these drawings without creative work. Unless it is obvious from the language environment or otherwise explained, the same reference numerals in the figures represent the same structure or operation.

[0022] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "an" and / or "the" do not refer to the singular and may also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0023] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0024] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0025] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0026] In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meaning and cannot be understood as limiting the scope of protection of this application. In addition, although the terms used in this application are selected from well-known and commonly used terms, some terms mentioned in the specification of this application may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this article. In addition, it is required to understand this application not only by the actual terms used, but also by the meaning implied by each term.

[0027] It should be understood that when a component is referred to as being "on another component," "connected to another component," "coupled to another component," or "contacting another component," it may be directly on, connected to, coupled to, or contacting the other component, or there may be intervening components. In contrast, when a component is referred to as being "directly on another component," "directly connected to," "directly coupled to," or "directly contacting" another component, there are no intervening components. Similarly, when a first component is referred to as being "electrically in contact with" or "electrically coupled to" a second component, there is an electrical path between the first component and the second component that allows current to flow. The electrical path may include capacitors, coupled inductors, and / or other components that allow current to flow, even without direct contact between conductive components.

[0028] This application refers to Figure 1 A warm-up system 10 for a high-temperature steam compressor (hereinafter referred to as "warm-up system 10") is proposed to improve the warm-up efficiency of the high-temperature steam compressor at a relatively low cost, thereby improving the safety and reliability of the compressor unit.

[0029] according to Figure 1 , the warm-up system 10 includes a steam source 101, a compressor 102 and a cranking system 103. Specifically, the steam source 101 is suitable for providing source steam; the compressor 102 includes an input end and an output end, the input end is suitable for receiving input end steam, the input end steam comes from the source steam of the steam source 101, and the output end is suitable for discharging output end steam, and the temperature and / or pressure of the output end steam is higher than the input end steam. The cranking system 103 is connected to the compressor 102, and the cranking system 103 is configured to drive the compressor to operate at a warm-up speed in the warm-up stage before the normal working condition, and the warm-up speed is less than the working speed of the compressor under normal working conditions, wherein the warm-up stage includes a stage where the wall temperature of the compressor 102 is less than the warm-up temperature threshold.

[0030] In various embodiments of the present application, Figure 1 The turning system 103 shown can be implemented in different ways. Figure 2 and Figure 3 Give two examples of each. Figure 2 and Figure 3 Based on Figure 1 Two preferred embodiments of the present invention respectively show a warm-up system 20 for a high-temperature steam compressor (hereinafter referred to as "warm-up system 20") and a warm-up system 30 for a high-temperature steam compressor (hereinafter referred to as "warm-up system 30"). The warm-up system 20 and the warm-up system 30 are similar to the above-mentioned Figure 1 Compared with the warm-up system 10 shown in FIG. 1 , the steam source 101 can be considered to be the same, and therefore the same reference numerals are used; however, since there are different implementations for the compressor 102 and the cranking system 103 , different reference numerals are used respectively.

[0031] First refer to Figure 2 In this embodiment, the cranking system 203 includes a cranking motor 2031. Exemplarily, in this embodiment, the speed range of the cranking motor 2031 is 20 rpm to 50 rpm. Further preferably, the cranking motor 2031 is configured to automatically disconnect from the compressor 202 after the speed of the compressor 202 increases from the warm-up speed to the speed threshold. In this embodiment, the main motor 2021 of the compressor 202 is also shown.

[0032] On the other hand, refer to Figure 3 ,exist Figure 3 In the illustrated embodiment, the compressor 302 further includes a main motor 3021, and the cranking system 303 includes a frequency converter 3031, wherein the frequency converter 3031 is connected to the main motor 3021 of the compressor 302. Further preferably, in this embodiment, the frequency converter 3031 is configured to operate the compressor 302 at a warm-up speed in the warm-up phase, and to operate the compressor 302 at a working speed under normal operating conditions.

[0033] By comparison Figure 2 and Figure 3 It can be seen that Figure 2 The cranking system 203 includes a cranking motor 2031, which is connected to the compressor 202 and drives the compressor 202 to operate at a warm-up speed during the warm-up phase; Figure 3 In the illustrated embodiment, the cranking system 303 includes a frequency converter 3031, which is directly connected to the main motor 3021 of the compressor 302, so as to control the compressor 202 to operate at a warm-up speed during the warm-up phase. Figure 2 and Figure 3The input ends 202a, 302a and output ends 202b, 302b of the compressor 202 and the compressor 302 are also shown respectively. In respective embodiments, the input end steam of the input end 202a, 302a comes from the source steam of the steam source 101, and the output end 202b, 302b is suitable for discharging the output end steam, and the temperature and / or pressure of the output end steam is higher than the input end steam.

[0034] according to Figure 2 and Figure 3 , the warm-up system 20 and the warm-up system 30 both include a heating device 104, which is connected between the steam source 101 and the compressors 202 and 302. The heating device 104 is configured to heat the source steam from the steam source 101 to increase the temperature of the source steam. Exemplarily, the heating device 104 includes an electric heater or a heat exchanger with a heat source. By providing the heating device 104, the source steam from the steam source 101 can be heated in a shorter time, thereby shortening the time of the warm-up phase and further improving the warm-up effect. Of course, for example, the heating device 104 is not a necessary device in all embodiments of the present application. In some scenarios, if the source steam temperature of the steam source 101 is high enough, the configuration of the heating device 104 can also be omitted in these embodiments. On the other hand, preferably, Figure 2 and Figure 3 The embodiment also includes a preheating regulating valve 105, which is connected between the heating device 104 and the compressor 202 and the compressor 302. The opening of the preheating regulating valve 105 is suitable for being controlled to adjust the pressure of the steam at the input end. The preheating regulating valve 105 can be considered necessary in some embodiments of the present application, especially for some more complicated warm-up and compressor startup processes, the preheating regulating valve 105 can play a role in timely and effective pressure regulation. In such an embodiment, the preheating regulating valve 105 can be set to exist independently, for example, directly connected to the steam source and the compressor. For the preheating regulating valve 105, please refer to the further description in the afternoon.

[0035] Another aspect of this application refers to Figure 4 A method 40 for warming up a high temperature steam compressor (hereinafter referred to as "the warming up method 40") is shown. Figure 4 Flowcharts are used to illustrate the operations performed by the system according to the embodiments of the present application. It should be understood that the preceding or following operations are not necessarily performed precisely in order. Instead, various steps may be processed in reverse order or simultaneously. At the same time, other operations may be added to these processes, or one or more operations may be removed from these processes.

[0036] according to Figure 4, the warm-up method 40 includes the following steps. Step 41 is to provide source steam through a steam source; step 42 is to receive input end steam through the input end of the compressor, and the input end steam comes from the source steam of the steam source. Step 43 is the warm-up stage before normal working conditions, in which the compressor is driven to operate at a warm-up speed through the cranking system, and the warm-up speed is lower than the working speed of the compressor under normal working conditions. Step 44 is to discharge the output end steam through the output end of the compressor, and the temperature and / or pressure of the output end steam is higher than the input end steam. Step 45 is to continue to execute the above steps until the compressor meets the warm-up end condition, and the warm-up end condition includes that the wall temperature of the compressor reaches the warm-up temperature threshold.

[0037] Exemplarily, the warm-up method 40 may be applicable to the warm-up system proposed in any embodiment of the present application, for example, Figure 1 to Figure 3 The warm-up system 10-30 shown in FIG. Figure 2 and Figure 3 In the illustrated embodiment, the warm-up system 20 and the warm-up system 30 both include a heating device 104 and a preheating regulating valve 105, wherein the heating device 104 is connected between the steam source 101 and the compressor 202 / compressor 302, and the preheating regulating valve 105 is connected between the heating device 104 and the compressor 202 / compressor 302. In such an embodiment, the warm-up method 40 can be further improved to include heating the source steam by the heating device 104 to increase the temperature of the source steam during the warm-up stage; in addition, the pressure of the input steam can also be adjusted by controlling the opening of the preheating regulating valve 105 during the warm-up stage. For other embodiments of the warm-up method 40 and its variations, please refer to the details in the previous text, which will not be repeated here.

[0038] In addition, in some preferred embodiments of the present application, at least a portion of the output steam at the output end of the compressor re-enters the compressor through the input end, and the warm-up stage may include a first warm-up stage and a second warm-up stage, the warm-up temperature threshold includes a first temperature threshold and a second temperature threshold, and the first temperature threshold is less than the second temperature threshold, wherein, in the first warm-up stage, the temperature of the source steam is increased from the initial temperature to the first temperature threshold through the heating device; in the second warm-up stage, the temperature of the source steam is increased from the first temperature threshold to the second temperature threshold after passing through the compressor and after one or more cycles.

[0039] In order to better understand the warm-up system and warm-up method of the present application and their preferred embodiments, Figure 2, a complete description is given of the warm-up process of the compressor 202 in this embodiment. In general, the compressor 202 needs to go through a warm-up stage so that the wall temperature of the compressor 202 reaches the warm-up temperature threshold before entering normal operating conditions; wherein, in the warm-up stage, the compressor 202 is driven by the cranking system 203 to operate at a warm-up speed, and after entering normal operating conditions, the compressor 202 will operate at the operating speed under normal conditions. This is a solution that can be achieved by the basic embodiment of the present application. More preferably, further details can be added to the control of the warm-up stage to achieve a better warm-up effect. The following exemplarily shows how to warm up and start the compressor 202 with a first stage and a second stage warm-up stage in a preferred embodiment.

[0040] Phase 1: In the warm-up phase, the warm-up temperature and pressure need to be gradually increased. The source steam is heated by the heating device 104 configured by the warm-up system 20. As mentioned above, this method can increase the temperature of the source steam from the steam source 101 in a shorter time, effectively shortening the warm-up time. Further, the warm-up pressure is controlled by the preheating regulating valve 105 configured by the warm-up system 20. Specifically, if the source steam pressure before the preheating regulating valve 105 is high, the throttling effect can be achieved by appropriately increasing the opening of the preheating regulating valve 105 to reduce the steam pressure reaching the input end 202a of the compressor 202.

[0041] The second stage: After completing the warm-up of the first stage, the compressor 202 can be used with partial load to increase the exhaust temperature and pressure of the compressor, thereby increasing the warm-up temperature and pressure and reducing the demand for the heating system. Specifically, the warm-up completion mark of the first stage can be understood as a stable threshold value outputted by a measuring point of a wall temperature sensor (such as a thermal resistor or a thermocouple) on the metal inner wall of the compressor 202 (it can be considered that the warm-up temperature threshold value mentioned above has two different values, and the stable threshold value here is the relatively lower first temperature threshold value), that is, in the first stage, the compressor 202 initially rises from a relatively low temperature to the first temperature threshold value. In the second stage, the cylinder needs to be heated to a higher temperature (it can be considered that the warm-up temperature threshold value mentioned above has two different values, and the higher temperature here is the second temperature threshold value that is higher than the first temperature threshold value). By making the compressor 202 carry a load in the second stage, the steam temperature and / or pressure at the output end 202b can be made higher than the input end 202a of the compressor 202. On this basis, the output steam discharged from the output end 202b is returned to the input end 202a of the compressor 202 through other lines in a closed cycle, thereby further gradually increasing the temperature and / or pressure of the output steam at the output end 202b of the compressor 202.

[0042] For example, the operating temperature of the compressor 202 under normal working conditions is set to 500 degrees. In the first stage, the wall temperature of the compressor 202 is increased from 30 degrees to 100 degrees; and in the second stage, the temperature is continued to be heated to 200 degrees. 100-200 degrees corresponds to the second stage in which the temperature and pressure of the output steam at the output end 202b of the compressor 202 are increased by the partial load carried by the compressor 202. After the second stage is completed, it is considered that the warm-up stage of the compressor 202 is over, and then the compressor 202 starts to increase the speed until it runs at the working speed under normal working conditions.

[0043] In the warm-up process described above, the cranking system 203 drives the rotor of the compressor 202 to rotate through the cranking motor 2031 to meet the warm-up requirements, thereby enhancing the steam flow and heat exchange efficiency in the unit and improving the warm-up efficiency of the unit. Alternatively, Figure 3 The main motor 3021 and the frequency converter 3031 of the compressor 302 shown cooperate with each other to meet the low speed operation requirement, thereby driving the compressor 302 to rotate at a low speed to achieve the same warm-up process as described above.

[0044] On the other hand, according to the operating parameters of the compressor 202, the warm-up stage in the preferred embodiment described above can be carried out in two stages. By controlling the warm-up temperature and pressure (for example, increasing the opening of the pre-warming regulating valve 105 when the source steam pressure is relatively high), the warm-up in different stages is carried out, and at the same time, the speed of the unit rotating parts of the compressor 202 is increased by the cranking system 203, and the temperature of the unit stator and rotating parts is gradually increased, so as to complete the warm-up preparation before starting.

[0045] In the related art, the compressor unit is generally equipped with a drag system, a compressor body, a lubrication system, a shaft seal system, a control system, a loading valve, an anti-surge valve and other process systems. Conventional compressor units can complete start-stop control and normal operation under different working conditions under the above configuration. However, due to the nature of the medium, when a warm-up system is added in accordance with the present application, the start-stop control and safety and reliability requirements of the unit can be better met.

[0046] Specifically, the warm-up process of the high-temperature steam compressor (including the unit's stator and rotor) is closely related to the steam temperature and cranking speed. The unit's stator and rotor will expand as the temperature rises, and the expansion difference between the two affects the gap between the static and dynamic parts, thereby affecting the safety of the unit startup. Directly starting the steam compressor without using the warm-up system of the present application will result in the adverse consequences of the rotating parts heating up quickly and the stator parts heating up slowly, thereby causing a temperature difference between the rotating parts and the stator parts, affecting the reliability and safety of the unit.

[0047] After adopting the warm-up system of the present application, at the same steam temperature, the heating speed of the stator and the rotating parts of the unit is affected by the cranking speed. The rotating parts of the unit rotate together with the cranking system, driving the steam flow in the unit, improving the heat exchange coefficient, thereby accelerating the temperature rise rate of the static and dynamic parts, making the static and dynamic parts expand evenly due to heat, and reducing the risk of dynamic and static friction when starting. In some embodiments, when a frequency converter is used to connect the main motor of the compressor, the same effect will be achieved. At this time, it is considered that part of the frequency converter constitutes the cranking system. Furthermore, no matter what implementation method of the cranking system is adopted, the cranking system can significantly increase the speed of the warm-up process and reduce the warm-up time by controlling parameters such as speed. From this perspective, the temperature difference between the heated parts and the stator can be further reduced by shortening the warm-up time.

[0048] Therefore, on the whole, the warm-up system and warm-up method in each embodiment of the present application can solve the problem of uneven deformation of rotating parts and stator parts caused by temperature difference during the start-up and shutdown of the high-temperature steam compressor, and improve the safety and reliability of the unit. Furthermore, some preferred schemes of the present application can adjust the pre-heating temperature and pressure according to the operating parameters of the unit to perform warm-up in different stages. Finally, the relevant configuration equipment in the warm-up system and warm-up method of the present application can be reasonably configured according to the process system of the unit to reduce construction costs. For example, in Figure 2-Figure 3 In the embodiment shown, the heating device 104 can be removed in some cases, especially when the temperature of the source steam output by the steam source 101 reaches a certain standard; in some other embodiments, the preheating regulating valve 105 can also be activated only when the source steam pressure is relatively high. In this way, some components can be flexibly configured in different embodiments to reduce system costs.

[0049] The basic concepts have been described above. Obviously, for those skilled in the art, the above application disclosure is only an example and does not constitute a limitation of the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements and amendments to the present application. Such modifications, improvements and amendments are suggested in the present application, so such modifications, improvements and amendments still belong to the spirit and scope of the exemplary embodiments of the present application.

[0050] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0051] Similarly, it should be noted that in order to simplify the description of the disclosure of this application and thus help understand one or more application embodiments, in the above description of the embodiments of this application, multiple features are sometimes merged into one embodiment, figure or description thereof. However, this disclosure method does not mean that the features required by the object of this application are more than the features mentioned in the claims. In fact, the features of the embodiments are less than all the features of the single embodiment disclosed above.

[0052] In some embodiments, numbers describing the number of components and attributes are used. It should be understood that such numbers used in the description of the embodiments are modified by the modifiers "about", "approximately" or "substantially" in some examples. Unless otherwise specified, "about", "approximately" or "substantially" indicate that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may change according to the required features of individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and adopt the general method of retaining digits. Although the numerical domains and parameters used to confirm the breadth of their range in some embodiments of the present application are approximate values, in specific embodiments, the setting of such numerical values ​​is as accurate as possible within the feasible range.

[0053] Although the present application has been described with reference to the current specific embodiments, ordinary technicians in this technical field should recognize that the above embodiments are only used to illustrate the present application, and various equivalent changes or substitutions may be made without departing from the spirit of the present application. Therefore, as long as the changes and modifications to the above embodiments are within the essential spirit of the present application, they will fall within the scope of the claims of the present application.

Claims

1. A warm-up system for a high-temperature steam compressor, characterized in that: include: a steam source, adapted to provide source steam; A compressor, comprising an input end and an output end, wherein the input end is adapted to receive input end steam, the input end steam comes from the source steam of the steam source, and the output end is adapted to discharge the output end steam, the temperature and / or pressure of the output end steam being higher than the input end steam; as well as A cranking system is connected to the compressor, and the cranking system is configured to drive the compressor to operate at a warm-up speed during a warm-up phase before normal operating conditions, and the warm-up speed is lower than the operating speed of the compressor under the normal operating conditions, wherein the warm-up phase includes a phase in which the wall temperature of the compressor is lower than a warm-up temperature threshold.

2. The warm-up system according to claim 1, characterized in that: The turning system comprises a turning motor, and the speed range of the turning motor is 20 rpm to 50 rpm.

3. The warm-up system according to claim 2, characterized in that: The cranking motor is configured to automatically disconnect from the compressor after the speed of the compressor increases from the warm-up speed to a speed threshold.

4. The warm-up system according to claim 1, characterized in that: The compressor further includes a main motor, and the cranking system includes a frequency converter, wherein the frequency converter is connected to the main motor of the compressor.

5. The warm-up system according to claim 4, characterized in that: The inverter is configured to operate the compressor at a warm-up speed during the warm-up phase, and to operate the compressor at the operating speed under the normal operating condition.

6. The warm-up system according to any one of claims 1 to 5, characterized in that: The system further includes a heating device connected between the steam source and the compressor, wherein the heating device is configured to heat the source steam to increase the temperature of the source steam.

7. The warm-up system according to claim 6, characterized in that: The heating device includes an electric heater or a heat exchanger having a heat source.

8. The warm-up system according to claim 6, characterized in that: It also includes a preheating regulating valve connected between the heating device and the compressor, and the opening of the preheating regulating valve is suitable for being controlled to adjust the pressure of the steam at the input end.

9. A method for warming up a high-temperature steam compressor, characterized in that: The steps include: providing source steam via a steam source; receiving input end steam through an input end of a compressor, wherein the input end steam comes from the source steam of the steam source; In the warm-up stage before the normal working condition, the compressor is driven to operate at a warm-up speed by the cranking system, and the warm-up speed is lower than the working speed of the compressor under the normal working condition; Discharging output end steam through the output end of the compressor, wherein the temperature and / or pressure of the output end steam is higher than that of the input end steam; as well as The above steps are continuously performed until the compressor meets a warm-up end condition, wherein the warm-up end condition includes that the wall temperature of the compressor reaches a warm-up temperature threshold.

10. The warm-up method according to claim 9, characterized in that: The method further includes heating the source steam by a heating device during the warm-up phase to increase the temperature of the source steam, wherein the heating device is connected between the steam source and the compressor.

11. The warm-up method according to claim 10, characterized in that: It also includes adjusting the pressure of the steam at the input end by controlling the opening of a preheating regulating valve during the warm-up phase, wherein the preheating regulating valve is connected between the heating device and the compressor.

12. The warm-up method according to claim 10 or 11, characterized in that: At least a portion of the output end steam at the output end reenters the compressor through the input end, the warm-up stage includes a first warm-up stage and a second warm-up stage, the warm-up temperature threshold includes a first temperature threshold and a second temperature threshold, and the first temperature threshold is less than the second temperature threshold, wherein, In the first warm-up stage, the temperature of the source steam is increased from the initial temperature to the first temperature threshold through the heating device; In the second warm-up stage, the temperature of the source steam increases from the first temperature threshold to the second temperature threshold after passing through the compressor and undergoing one or more cycles.

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