System and method for absorbing redundant flow of high-temperature steam compressor

Abstract

The invention provides a redundant flow consumption system for a high-temperature steam compressor, and the system comprises a steam source which is suitable for providing source steam; the steam compressor comprises an inlet end and an outlet end, the inlet end is connected to the steam source to receive source steam, and the outlet end is suitable for discharging an original working medium; the cooling water applying device is arranged on one side of the outlet end and is suitable for applying cooling water to the original working medium flowing into the cooling water applying device to form a cooled working medium; the overflow valve is arranged in a working medium flowing path after the cooling water applying device discharges the cooled working medium, the overflow valve is suitable for responding to the control instruction to adjust the opening degree of the valve, and the opening degree of the valve is determined according to the difference value between the actual flow of the steam compressor and the target flow of the system. According to the redundant flow consumption system and method for the high-temperature steam compressor, the total working medium amount of the system can be balanced on the premise that the temperature of the system is not too high.

Description

Technical Field

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

[0002] At present, with the increasing demand of heat users, conventional steam supply is difficult to meet the changing needs of users, and cannot solve the contradiction between supply and demand. At this time, it is necessary to optimize the performance of steam compressors to overcome these problems, such as involving high-temperature steam compressors to provide high-quality steam with flow that changes with demand.

[0003] However, the application system of high-temperature steam compressors is complex, and there are problems such as reduced leakage, increased water spray, and overflow valve discharge. It is too wasteful to use ultra-high precision flow meters to control the flow for heating occasions, and it is not easy to accurately control the total amount of working fluid in the system. If the flow in a closed system decreases, it will cause the compressor equipment to overheat and overpressure, affecting the life of the equipment; if the flow increases, it will not be able to meet the parameters required for heating. Summary of the invention

[0004] The technical problem to be solved by the present application is to provide a system and method for accommodating excess flow of a high-temperature steam compressor, which can balance the total amount of system working fluid under the premise of ensuring that the system temperature is not too high.

[0005] To solve the above-mentioned technical problems, the present application provides a high-temperature steam compressor excess flow disposal system, the system comprising: a steam source, suitable for providing source steam; a steam compressor, the steam compressor comprising an inlet end and an outlet end, the inlet end being connected to the steam source to receive the source steam, and the outlet end being suitable for discharging the original working fluid; a cooling water application device, arranged on one side of the outlet end, suitable for applying cooling water to the original working fluid flowing into the cooling water application device to form a cooled working fluid; and an overflow valve, arranged in the working fluid flow path after the cooling water application device discharges the cooled working fluid, the overflow valve being suitable for responding to a control instruction to adjust the valve opening, wherein the valve opening is determined according to the difference between the actual flow of the steam compressor and the target flow of the system.

[0006] Optionally, it also includes an inlet steam pressure measuring point arranged on the inlet end side, and an exhaust steam pressure measuring point located on the outlet end side, the inlet steam pressure measuring point is suitable for providing the inlet steam pressure value of the steam compressor, and the exhaust steam pressure measuring point is suitable for providing the exhaust steam pressure value of the steam compressor, wherein the ratio of the exhaust steam pressure value to the inlet steam pressure value is the pressure ratio value of the steam compressor.

[0007] Optionally, the steam compressor is configured to have different pressure ratio-flow curves at different rotation speeds, and the actual flow rate is suitable for being obtained by combining the pressure ratio value and the actual rotation speed with the pressure ratio-flow curve.

[0008] Optionally, the relief valve is configured to have a flow-valve opening curve, and the valve opening is suitable for being obtained by combining the difference between the actual flow and the target flow of the steam compressor with the flow-valve opening curve.

[0009] Optionally, it also includes an inlet steam temperature measuring point arranged on the inlet end side and / or an exhaust steam temperature measuring point arranged on the outlet end side.

[0010] Optionally, a control center is also included, which is suitable for obtaining the actual flow of the steam compressor and the target flow of the system, and obtaining the valve opening of the overflow valve according to the difference between the actual flow of the steam compressor and the target flow of the system, thereby generating the control instruction according to the valve opening.

[0011] Another aspect of the present application also proposes a method for absorbing excess flow of a high-temperature steam compressor, comprising the following steps: providing a steam source, a steam compressor and a cooling water application device, wherein the steam source is suitable for providing source steam; the steam compressor comprises an inlet end and an outlet end, the inlet end is connected to the steam source to receive the source steam; the cooling water application device is arranged on one side of the outlet end, and is suitable for applying cooling water to the original working fluid flowing into the cooling water application device to form a cooled working fluid; providing an overflow valve, and arranging the overflow valve in the working fluid flow path after the cooling water application device discharges the cooled working fluid; determining the valve opening of the overflow valve according to the difference between the actual flow rate of the steam compressor and the target flow rate, and generating a control instruction; and causing the overflow valve to respond to the control instruction to adjust the valve opening.

[0012] Optionally, the method further includes obtaining a steam inlet pressure value at the inlet end of the steam compressor and an exhaust pressure value at the outlet end; and calculating a ratio of the steam inlet pressure value to the exhaust pressure value to obtain a pressure ratio value of the steam compressor.

[0013] Optionally, it also includes: obtaining a pressure ratio-flow curve of the steam compressor at different speeds; obtaining an actual speed of the steam compressor; and obtaining an actual flow of the steam compressor based on the actual speed, the pressure ratio value and the pressure ratio-flow curve.

[0014] Optionally, it also includes: obtaining the flow-valve opening curve of the overflow valve; calculating the flow difference of the steam compressor according to the actual flow and the target flow; calculating the valve opening of the overflow valve according to the flow difference and the flow-valve opening curve, and generating the control instruction.

[0015] Compared with the prior art, the present application has the following advantages: the system and method for accommodating excess flow of a high-temperature steam compressor proposed in the present application not only achieves the cooling of the flowing working fluid in the system but also achieves precise control of the flow without increasing additional costs, thereby ensuring the stability, economy and reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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:

[0017] Figure 1 This is a system block diagram of a system for accommodating excess flow of a high-temperature steam compressor according to an embodiment of the present application;

[0018] Figure 2 Yes Figure 1 A schematic diagram of a pressure ratio-flow rate curve of a steam compressor in a high-temperature steam compressor excess flow rate disposal system in the illustrated embodiment;

[0019] Figure 3 Yes Figure 1 A schematic diagram of a flow-valve opening curve of a relief valve in a high-temperature steam compressor excess flow absorption system in the illustrated embodiment; and

[0020] Figure 4 It is a flow chart of a method for accommodating excess flow of 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] An embodiment of the present application refers to Figure 1 A high-temperature steam compressor excess flow absorption system 10 (hereinafter referred to as "system 10") is proposed. System 10 can balance the total amount of system working fluid under the premise of ensuring that the system temperature is not too high.

[0029] according to Figure 1The system 10 includes a steam source 11, a steam compressor 12, a cooling water application device 13 and a relief valve 14. Specifically, the steam source 11 is suitable for providing source steam. Figure 1 The steam compressor 12 and the motor M therein are shown. The steam compressor 12 further includes an inlet end 121 and an outlet end 122. The inlet end 121 is connected to the steam source 11 to receive the source steam, and the outlet end 122 is suitable for discharging the original working medium. A cooling water applying device 13 is arranged on one side of the outlet end 122. The cooling water applying device 13 is suitable for applying cooling water to the original working medium flowing into the cooling water applying device 13 to form a cooled working medium. Finally, Figure 1 The overflow valve 14 shown is arranged in the working medium flow path after the cooling water applying device 13 discharges the cooled working medium, and the overflow valve 14 is adapted to adjust the valve opening in response to the control instruction. Figure 1 In the embodiment, the valve opening of the relief valve 14 is determined according to the difference between the actual flow rate of the steam compressor 12 and the target flow rate, so as to achieve the purpose of balancing the total amount of the system working fluid under the premise of ensuring that the system temperature is not too high.

[0030] For example, the target flow rate is determined according to the specific application scenario or the actual needs of the user end. For example, the client demand is 100 tons / hour of high-temperature steam, which is often a certain value. The actual flow rate is preferably obtained in the following manner in this application.

[0031] like Figure 1 As shown, in this embodiment, the system 10 further includes a steam inlet pressure measuring point 151 disposed on one side of the inlet end 121, and an exhaust pressure measuring point 152 disposed on one side of the outlet end 122. The steam inlet pressure measuring point 151 is suitable for providing the steam inlet pressure value of the steam compressor 12, and the exhaust pressure measuring point 152 is suitable for providing the exhaust pressure value of the steam compressor 12. On this basis, the pressure ratio value of the steam compressor 12 can be determined by the ratio obtained by comparing the exhaust pressure value with the inlet pressure value.

[0032] For example, Figure 2 It shows that Figure 1 The embodiment shown is a schematic diagram of the pressure ratio-flow curve of the steam compressor 12 at different speeds. It can be seen that Figure 2 Six curves, namely curve A, curve B, curve F, are shown, which respectively represent the corresponding relationship between the pressure ratio and the actual flow rate of the steam compressor 12 at different speeds. Figure 2 As shown in the schematic diagram of the pressure ratio-flow curve, under the condition of known speed of the steam compressor 12, by first determining the corresponding curve and combining the inlet pressure value and exhaust pressure value measured by the inlet pressure measuring point 151 and the exhaust pressure measuring point 152, the pressure ratio value can be calculated, so as to Figure 2 The actual flow rate of the corresponding steam compressor 12 can be found. Specifically, Figure 2 The ordinate is the dimensionless number of the pressure ratio, and the abscissa is the parameter of the flow rate. For any specific model or structure of the steam compressor 12, its pressure ratio-flow rate curve can be directly determined, and at a certain speed, the pressure ratio and the flow rate have a definite corresponding relationship.

[0033] Furthermore, Figure 3 It shows that Figure 1 In the embodiment shown, the flow rate-valve opening curve diagram of the relevant configuration of the overflow valve 14 is shown. Figure 2 The actual flow rate of the steam compressor 12 can be directly calculated by combining the target flow rate of the steam compressor 12 with the flow difference parameter. Figure 3 The flow-valve opening curve shown can be used to obtain the corresponding valve opening that the overflow valve 14 needs to achieve in order to satisfy the flow control of the system 10 (i.e., to regulate the flow difference). Specifically, Figure 3 The vertical axis is the valve opening, which is generally expressed in percentage, and the horizontal axis is the flow-related parameters. For a specific model or structure of the overflow valve 14, there is a definite functional relationship between the valve opening and the flow. On this basis, once the difference between the actual flow of the steam compressor 12 and the target flow is determined, combined with Figure 3 That is, the corresponding valve opening can be found.

[0034] Combine the following Figure 2 and Figure 3 Let’s take an example of how to determine the valve opening. First, based on the steam inlet pressure value and the exhaust pressure value measured by the steam inlet pressure measuring point 151 and the exhaust pressure measuring point 152, the pressure ratio value P1 of the steam compressor 12 can be calculated. Assuming that the current speed of the steam compressor 12 corresponds to the curve E, then the corresponding parameter of the actual flow rate L of the steam compressor 12 can be found based on the pressure ratio value P1 and the curve E. On this basis, according to the target flow rate Lm and the actual flow rate L, the flow difference ΔL can be calculated (for example, when the actual flow rate L is greater than the target flow rate Lm, ΔL=L-Lm). Further according to Figure 3 According to the horizontal coordinate position corresponding to the flow difference ΔL, find point M on the curve, and obtain the valve opening N% of the corresponding vertical coordinate.

[0035] On this basis, preferably, the system 10 can generate a control instruction that can be applied to the overflow valve 14 according to the valve opening N%, and enable the overflow valve 14 to automatically adjust its valve opening to achieve flow control for the system 10. Exemplarily, in such an embodiment, the system 10 may also include a control center, which is suitable for obtaining the actual flow of the steam compressor 12, the target flow of the system 10, and obtaining the valve opening of the overflow valve 14 according to the difference between the actual flow of the steam compressor 12 and the target flow of the system 10 through the above calculation method, and generating a corresponding control instruction according to the valve opening. It can be understood that the above description only provides a preferred embodiment of the present application. In some embodiments, it is not excluded to obtain the relevant parameters of the valve opening of the overflow valve 14 by calculation and then realize the flow control of the system 10 through artificial conditions, and the present application does not limit this.

[0036] In this embodiment, preferably, the system 10 further includes an inlet steam temperature measuring point 161 disposed on one side of the inlet end 121 and / or an exhaust steam temperature measuring point 162 disposed on one side of the outlet end 122. By setting temperature measuring points at corresponding positions in the system 10, the inlet steam temperature and / or exhaust steam temperature of the steam compressor 12 can be directly read when necessary, thereby more effectively controlling the temperature of the system 10.

[0037] The system 10 of the present application solves the problem of the increasing total amount of working fluid in the system 10 by setting a relief valve 14. Specifically, during the normal operation of the system 10, the shaft end self-sealing system of the steam compressor 12 will cause leakage of the working fluid, and the leaked working fluid cannot return to the circulation system, resulting in a total loss of the working fluid. On this basis, on the other hand, during the operation of the steam compressor 12, electrical energy will be continuously converted into system energy, resulting in a continuous increase in the temperature of the working fluid. In order to ensure the stable and safe operation of the system 10, a cooling water application device 13 for cooling is provided. Exemplarily, the cooling water application device 13 can be implemented as a water spray desuperheater, which directly enters the original working fluid by spraying water to generate a cooled working fluid. Although this method will have a timely and effective cooling effect, it will also increase the total amount of the working fluid. The above two factors cause the total amount of the working fluid in the system 20 to continue to increase or decrease. Generally speaking, the increase is greater than the shaft end leakage of the steam compressor 12, that is, the total amount of the working fluid in the system 10 tends to increase after long-term operation. Therefore, the system 10 timely controls and balances the total flow of the working fluid in the system 10 by adjusting the valve opening of the overflow valve 14 .

[0038] When controlling the total flow of the working fluid, the closed-loop system 10 accurately obtains and calculates the flow conditions, obtains accurate actual flow parameters through relevant calculations of the pressure ratio value of the steam compressor 12, and estimates a relatively accurate theoretical overflow range based on the target flow, and reasonably selects the overflow valve so that the entire adjustment range is within the flow linear control range of the overflow valve, providing a major premise for precise control. On this basis, when controlling the total amount of working fluid during the operation of the entire system 10, the value of the pressure measurement points at the inlet and outlet ends of the steam compressor 12 is obtained and linked to the valve opening of the overflow valve 14 to achieve closed-loop control of the valve opening of the overflow valve 14. Since the inlet pressure measurement point 151 and the exhaust pressure measurement point 152 have high precision and fast real-time response speed, the opening control of the overflow valve 14 is more accurate, and it is easier to ensure the total flow of the working fluid in the system 10, thereby ensuring the stable operation of the system 10.

[0039] This application refers to Figure 4 A method 40 for absorbing excess flow of a high-temperature steam compressor (hereinafter referred to as "method 40") is proposed. Method 40 can balance the total amount of system working fluid without exceeding the system temperature. 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.

[0040] according to Figure 4 , method 40 specifically includes the following steps: step 41 is to provide a steam source, a steam compressor and a cooling water application device. Specifically, the steam source is suitable for providing source steam; the steam compressor includes an inlet end and an outlet end, and the inlet end is connected to the steam source to receive the source steam; the cooling water application device is arranged on one side of the outlet end, and is suitable for applying cooling water to the original working fluid flowing into the cooling water application device to form a cooled working fluid. Further, step 42 is to provide an overflow valve, and set the overflow valve in the working fluid flow path after the cooling water application device discharges the cooled working fluid. On this basis, step 43 is to determine the valve opening of the overflow valve according to the difference between the actual flow rate of the steam compressor and the target flow rate, and generate a control instruction. Step 44 is to make the overflow valve respond to the control instruction to adjust the valve opening.

[0041] Based on Figure 4The method 40 shown can further obtain the steam inlet pressure value at the inlet end of the steam compressor and the exhaust pressure value at the outlet end; calculate the ratio of the steam inlet pressure value to the exhaust pressure value to obtain the pressure ratio value of the steam compressor. On this basis, obtain the pressure ratio-flow curve of the steam compressor at different speeds; obtain the actual speed of the steam compressor; and obtain the actual flow of the steam compressor according to the actual speed, the pressure ratio value and the pressure ratio-flow curve. Thus, Figure 4 The step 43 shown can be further refined as follows: obtaining the flow-valve opening curve of the relief valve; calculating the flow difference of the steam compressor according to the actual flow and the target flow; calculating the valve opening of the relief valve according to the flow difference and the flow-valve opening curve, and generating a control instruction.

[0042] For example, Figure 4 The method 40 shown can be applied to Figure 1 The system 10 shown in FIG. 1 is a schematic diagram of a method 40, and therefore other details and preferred variant steps of the method 40 can be referred to in the previous text according to Figure 1 The description will not be repeated here.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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 system for absorbing excess flow of a high-temperature steam compressor, characterized in that: The system comprises: A steam source, adapted to provide source steam; A steam compressor, the steam compressor comprising an inlet end and an outlet end, the inlet end is connected to the steam source to receive the source steam, and the outlet end is suitable for discharging the original working medium; a cooling water applying device, disposed at one side of the outlet end, adapted to apply cooling water to the original working medium flowing into the cooling water applying device to form a cooled working medium; and An overflow valve is arranged in the working medium flow path after the cooling water application device discharges the cooled working medium. The overflow valve is suitable for responding to a control instruction to adjust the valve opening, wherein the valve opening is determined according to the difference between the actual flow of the steam compressor and the target flow of the system.

2. The system according to claim 1, characterized in that It also includes a steam inlet pressure measuring point arranged on one side of the inlet end, and an exhaust steam pressure measuring point located on one side of the outlet end, the steam inlet pressure measuring point is suitable for providing the steam inlet pressure value of the steam compressor, and the exhaust steam pressure measuring point is suitable for providing the exhaust pressure value of the steam compressor, wherein the ratio of the exhaust steam pressure value to the steam inlet pressure value is the pressure ratio value of the steam compressor.

3. The system according to claim 2, characterized in that The steam compressor is configured to have different pressure ratio-flow curves at different rotation speeds, and the actual flow is suitable for being obtained by combining the pressure ratio value and the actual rotation speed with the pressure ratio-flow curve.

4. The system according to claim 3, characterized in that The relief valve is configured to have a flow-valve opening curve, and the valve opening is suitable for being obtained by combining the difference between the actual flow and the target flow of the steam compressor with the flow-valve opening curve.

5. The system according to claim 1, wherein: It also includes a steam inlet temperature measuring point arranged on the side of the inlet end and / or an exhaust steam temperature measuring point arranged on the side of the outlet end.

6. The system according to any one of claims 1 to 5, characterized in that: It also includes a control center, which is suitable for obtaining the actual flow of the steam compressor and the target flow of the system, and obtaining the valve opening of the overflow valve according to the difference between the actual flow of the steam compressor and the target flow of the system, thereby generating the control instruction according to the valve opening.

7. A method for absorbing excess flow of a high-temperature steam compressor, characterized in that: The steps include: A steam source, a steam compressor and a cooling water applying device are provided, wherein the steam source is suitable for providing source steam; the steam compressor comprises an inlet end and an outlet end, the inlet end is connected to the steam source to receive the source steam; the cooling water applying device is arranged at one side of the outlet end, and is suitable for applying cooling water to the original working medium flowing into the cooling water applying device to form a cooled working medium; Providing an overflow valve, and arranging the overflow valve in the working medium flow path after the cooling water applying device discharges the cooled working medium; determining the valve opening of the overflow valve according to the difference between the actual flow rate of the steam compressor and the target flow rate, and generating a control instruction; and The relief valve is caused to respond to a control instruction to adjust the valve opening.

8. The method according to claim 7, characterized in that Also includes: Obtaining a steam inlet pressure value at the inlet end and a steam exhaust pressure value at the outlet end of the steam compressor; as well as The ratio of the steam inlet pressure value to the exhaust pressure value is calculated to obtain the pressure ratio value of the steam compressor.

9. The method according to claim 8, characterized in that Also includes: Obtaining a pressure ratio-flow curve of the steam compressor at different speeds; Obtaining an actual rotation speed of the steam compressor; as well as The actual flow rate of the steam compressor is obtained according to the actual rotational speed, the pressure ratio value and the pressure ratio-flow rate curve.

10. The method according to claim 9, characterized in that Also includes: Obtaining a flow-valve opening curve of the relief valve; Calculating a flow rate difference of the steam compressor according to the actual flow rate and the target flow rate; as well as The valve opening of the relief valve is calculated according to the flow difference and the flow-valve opening curve, and the control instruction is generated.

Images