Quick start-stop system and control method

Abstract

The invention relates to a quick start-stop system and a control method. The quick start-stop system comprises a high-temperature steam compressor, a heating assembly, a water spraying cooling device, an inlet pipeline, an outlet pipeline and a backflow pipeline, an inlet and an outlet of the high-temperature steam compressor are connected with the inlet pipeline and the outlet pipeline respectively, and the inlet pipeline is used for enabling steam provided by an external air source to pass through a rotor cylinder of the high-temperature steam compressor; an outlet pipeline of the high-temperature steam compressor is connected into the inlet pipeline through a return pipeline to form a closed loop; the heating assembly is arranged on the inlet pipeline and used for heating steam in the inlet pipeline; the water spraying cooling device is arranged on the backflow pipeline and used for reducing the temperature of steam in the backflow pipeline. According to the quick start-stop system and the control method, the start-stop time of the high-temperature steam compressor can be shortened, and then the overall operation efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of high-temperature steam compressors, and in particular to a rapid start-stop system and a control method. Background Art

[0002] Steam compressor is a key equipment in heat recovery system that increases steam temperature and pressure by compressing the generated steam. Steam compressor increases the temperature and pressure of low-temperature and low-pressure steam through steam conversion device, electric heating and electric drive steam compression to meet the gas supply requirements of high, medium and low pressure high-temperature superheated steam required by the process or engineering. In the initial operation stage of high-temperature steam compressor, the control of the start-stop system is the key factor in controlling the energy consumption and efficiency of the whole system.

[0003] Conventional compressors have a low operating temperature. Conventional compressor start-stop methods are to start the machine after a period of low-speed cranking, or to introduce working fluid into the compressor inlet and use the compressor circuit to preheat the compressor. These two methods have low start-up efficiency and long start-up time, which affects the unit's work efficiency. Summary of the invention

[0004] In view of the above problems in the prior art, the present invention proposes a rapid start-stop system and control method, which can reduce the start-stop time of the high-temperature steam compressor and thus improve the overall operating efficiency.

[0005] Specifically, the present invention proposes

[0006] A rapid start-stop system includes a high-temperature steam compressor, a heating component, a water spray cooling device, an inlet pipeline, an outlet pipeline and a return pipeline, wherein:

[0007] The inlet and outlet of the high-temperature steam compressor are connected to the inlet pipeline and the outlet pipeline respectively, the inlet pipeline is used to pass the steam provided by the external gas source through the rotor cylinder of the high-temperature steam compressor, and the outlet pipeline of the high-temperature steam compressor is connected to the inlet pipeline through the return pipeline to form a closed loop;

[0008] The heating component is arranged on the inlet pipeline and is used to heat the steam in the inlet pipeline;

[0009] The water spray cooling device is arranged on the return pipeline and is used to reduce the steam temperature in the return pipeline.

[0010] According to one embodiment of the present invention, the rapid start-stop system further includes an electric gate valve and a regulating valve arranged on the inlet pipeline, the electric gate valve is used to open or close the inlet pipeline, and the regulating valve is used to adjust the steam flow rate in the inlet pipeline.

[0011] According to one embodiment of the present invention, the rapid start-stop system further includes:

[0012] a first flow detection device, a first pressure detection device and a first temperature detection device provided on the inlet pipeline, for detecting the flow rate, pressure and temperature of the steam in the inlet pipeline respectively; and

[0013] A filter is arranged on the inlet pipeline.

[0014] According to one embodiment of the present invention, the rapid start-stop system further comprises a second pressure detection device and a second temperature detection device provided on the outlet pipeline, which are used to detect the pressure and temperature of the steam in the outlet pipeline respectively.

[0015] According to one embodiment of the present invention, the rapid start-stop system further includes a reflux valve connected between the outlet pipeline and the reflux pipeline.

[0016] According to one embodiment of the present invention, the rapid start-stop system further includes an anti-surge valve connected in parallel with the reflux valve.

[0017] According to one embodiment of the present invention, the rapid start-stop system further comprises an overflow regulating valve provided in a return pipeline from the water spray cooling device to an inlet pipeline.

[0018] The present invention also provides a control method, which is applicable to the aforementioned fast start-stop system, and the control method comprises the steps of:

[0019] In the initial stage, the outlet pipeline and the return pipeline are disconnected, the heating component is turned on to heat the steam entering the inlet pipeline, and the high-temperature steam compressor is controlled to operate under load;

[0020] Detecting the steam pressure of the rotor cylinder of the high-temperature steam compressor, if it reaches a set value, connecting the outlet pipeline and the return pipeline to keep the steam pressure of the rotor cylinder stable, and controlling the water spray cooling device to enter a semi-opening and closing working state;

[0021] The heating assembly and the water spray cooling device are adjusted, and the steam flow is adjusted through the return pipeline so that the steam flow, temperature and pressure of the inlet pipeline meet the operating requirements of the high-temperature steam compressor.

[0022] According to one embodiment of the present invention, the outlet pipeline and the return pipeline are connected via a return valve. If the steam pressure of the rotor cylinder of the high-temperature steam compressor reaches a set value, the return valve is opened, and the steam in the outlet pipeline enters the return pipeline to keep the steam pressure of the rotor cylinder stable.

[0023] According to one embodiment of the present invention, an overflow regulating valve is provided on the return pipeline from the water spray cooling device to the inlet pipeline. If the steam flow rate of the inlet pipeline exceeds the operating requirement of the high-temperature steam compressor, the overflow regulating valve is opened to release the steam in the return pipeline.

[0024] The present invention provides a rapid start-stop system and control method, which forms a closed loop through a high-temperature steam compressor, a heating component and a water spray cooling device, and can reduce the start-stop time of the high-temperature steam compressor, thereby improving the overall operating efficiency.

[0025] It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are included to provide further explanation of the present invention, and are incorporated into and constitute a part of this application. The accompanying drawings illustrate embodiments of the present invention and together with the description serve to explain the principle of the present invention.

[0027] In the attached figure:

[0028] Figure 1 A schematic structural diagram of a fast start-stop system according to an embodiment of the present invention is shown.

[0029] Figure 2 A flowchart of a control method according to an embodiment of the present invention is shown.

[0030] Figure 3 A schematic diagram showing the start and stop states of the rapid start and stop system of the present invention and a conventional compressor is shown.

[0031] The above drawings include the following reference numerals:

[0032] Quick start-stop system 100

[0033] High Temperature Steam Compressor 101

[0034] Heating component 102

[0035] Water spray cooling device 103

[0036] Inlet pipe 104

[0037] Export pipeline 105

[0038] Return line 106

[0039] Electric gate valve 107

[0040] Control valve 108

[0041] The first flow detection device 109

[0042] First pressure detection device 110

[0043] The first temperature detection device 111

[0044] The second pressure detection device 112

[0045] Second temperature detection device 113

[0046] Reflux valve 114

[0047] Anti-surge valve 115

[0048] Overflow regulating valve 116

[0049] Emergency pressure relief valve 117

[0050] Filter 118 DETAILED DESCRIPTION

[0051] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0052] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually merely illustrative and is by no means intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0053] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0054] 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 application. Meanwhile, 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 actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the 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, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0055] 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.

[0056] 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.

[0057] Figure 1 The schematic diagram of the structure of a rapid start-stop system of an embodiment of the present invention is shown. As shown in the figure, a rapid start-stop system 100 mainly includes a high-temperature steam compressor 101, a heating component 102, a water spray cooling device 103, an inlet pipeline 104, an outlet pipeline 105 and a return pipeline 106.

[0058] The inlet and outlet of the high-temperature steam compressor 101 are respectively connected to the inlet pipeline 104 and the outlet pipeline 105. The inlet pipeline 104 is used to pass the steam (derived from water vapor) provided by the external gas source through the rotor cylinder of the high-temperature steam compressor 101, and the outlet pipeline 105 of the high-temperature steam compressor 101 is connected to the inlet pipeline 104 through the return pipeline 106. The inlet pipeline 104, the outlet pipeline 105 and the return pipeline 106 form a closed loop.

[0059] The heating assembly 102 is arranged on the inlet pipeline 104, and is used to heat the steam in the inlet pipeline 104 to increase the temperature of the steam entering the high-temperature steam compressor 101. The water spray cooling device 103 is arranged on the return pipeline 106, and the cooling water connected externally is used to reduce the temperature of the steam in the return pipeline 106. The steam in the return pipeline 106 that has been cooled is combined with the steam provided by the external gas source to enter the rotor cylinder of the high-temperature steam compressor 101, which can enable the high-temperature steam compressor 101 to quickly enter the working state.

[0060] Preferably, an electric gate valve 107 and a regulating valve 108 are provided in parallel on the inlet pipeline 104. The electric gate valve 107 is used to open or close the inlet pipeline 104, and the regulating valve 108 is used to adjust the steam flow in the inlet pipeline 104. The confluence of the return pipeline 106 and the inlet pipeline 104 is located downstream of the electric gate valve 107.

[0061] Preferably, a first flow detection device 109, a first pressure detection device 110 and a first temperature detection device 111 are provided on the inlet pipeline 104. The first flow detection device 109 is used to detect the flow of steam in the inlet pipeline 104, the first pressure detection device 110 is used to detect the pressure of steam in the inlet pipeline 104, and the first temperature detection device 111 is used to detect the temperature of steam in the inlet pipeline 104. A filter 118 is also provided on the inlet pipeline 104, close to the high-temperature steam compressor 101 side, to ensure the purity of the steam entering the high-temperature steam compressor 101.

[0062] Preferably, a second pressure detection device 112 and a second temperature detection device 113 are provided on the outlet pipeline 105 , which are used to detect the pressure and temperature of the steam in the outlet pipeline 105 , respectively.

[0063] Preferably, the outlet pipeline 105 and the return pipeline 106 are connected via a return valve 114. When the return valve 114 is in a closed state, the outlet pipeline 105 and the return pipeline 106 are disconnected, and the steam in the outlet pipeline 105 cannot enter the return pipeline 106; when the return valve 114 is in an open state, the outlet pipeline 105 and the return pipeline 106 are connected, and the steam in the outlet pipeline 105 can smoothly enter the return pipeline 106.

[0064] Preferably, the rapid start-stop system 100 is further provided with an anti-surge valve 115 connected in parallel with the return valve 114. When the steam flow in the inlet pipeline 104 decreases, the anti-surge valve 115 is opened to directly introduce the steam in the outlet pipeline 105 into the inlet pipeline 104 to prevent the high-temperature steam compressor 101 from surging.

[0065] Preferably, an overflow regulating valve 116 is provided on the return pipeline 106 from the water spray cooling device 103 to the inlet pipeline 104. When the temperature and pressure of the steam in the inlet pipeline 104 reach the inlet requirements of the high-temperature steam compressor 101, it is necessary to remove the excess water in the closed pipeline. By providing the overflow regulating valve 116 on the return pipeline 106, and through the valve action of the overflow regulating valve 116, the excess water is distributed to the outside of the pipeline to ensure that the inlet flow of the high-temperature steam compressor 101 meets the operating requirements. Specifically, the overflow regulating valve 116 is synchronously adjusted according to the pressure detection result of the first pressure detection device 110, and while discharging the excess water, the steam pressure in the rotor cylinder of the high-temperature steam compressor 101 is stabilized through the valve action.

[0066] Preferably, an emergency pressure relief valve 117 is also provided on the outlet pipeline 105 to reduce the steam pressure in the closed pipeline. The connection points of the reflux valve 114 and the anti-surge valve 115 with the outlet pipeline 105 are both arranged upstream of the emergency pressure relief valve 117 .

[0067] Figure 2 The flowchart of a control method of an embodiment of the present invention is shown. As shown in the figure, the present invention also provides a control method, which is applicable to the aforementioned fast start-stop system 100. The control method comprises the steps of:

[0068] In the initial stage, the outlet pipeline 105 and the return pipeline 106 are disconnected, and the heating component 102 is turned on to heat the steam entering the inlet pipeline 104 to increase the steam temperature, and the high-temperature steam compressor 101 is controlled to operate under load. By opening the electric gate valve 107 and the regulating valve 108, the steam flow rate from the external gas source into the inlet pipeline 104 is controlled. At this time, the regulating valve 108 is fully opened, and the steam enters the high-temperature steam compressor 101 through the filter 118. The high-temperature steam compressor 101 operates under load to accelerate the temperature rise of the rotor cylinder. A temperature measuring point is set in the rotor cylinder to detect temperature changes.

[0069] The steam pressure of the rotor cylinder of the high-temperature steam compressor 101 is detected. If it reaches the set value, the outlet pipeline 105 and the return pipeline 106 are connected through the return valve 114 to keep the steam pressure of the rotor cylinder stable, and the water spray cooling device 103 enters a semi-open and closed working state. Specifically, if the steam pressure in the rotor cylinder reaches the set value, the outlet pipeline 105 and the return pipeline 106 are connected, and the steam enters the return pipeline 106 from the outlet pipeline 105, and the steam in the pipeline is cooled by the water spray cooling device 103.

[0070] Adjust the heating component 102 and the water spray cooling device 103, and adjust the steam flow through the return line 106 so that the steam flow, temperature and pressure of the inlet line 104 meet the operating requirements of the high-temperature steam compressor 101. Adjust the water spray cooling device 103 so that the difference between the current steam temperature and the initial inlet temperature is within 50°C to avoid the temperature difference causing the expansion difference. At the same time, reduce the heating power of the heating component 102 to reduce power consumption and ensure the steam temperature entering the high-temperature steam compressor 101. Adjust the steam flow through the return line 106 to ensure that the steam flow and pressure entering the high-temperature steam compressor 101 meet the requirements.

[0071] Preferably, the return valve 114 is connected between the outlet pipeline 105 and the return pipeline 106. If the steam pressure of the rotor cylinder of the high-temperature steam compressor 101 reaches a set value, the return valve 114 is opened, the outlet pipeline 105 and the return pipeline 106 are connected, and the steam in the outlet pipeline 105 enters the return pipeline 106 to keep the steam pressure of the rotor cylinder stable.

[0072] Preferably, the return valve 114 is connected in parallel with an anti-surge valve 115. The anti-surge valve 115 is used to directly introduce the steam in the outlet pipeline 105 into the inlet pipeline 104 to prevent the high-temperature steam compressor 101 from surging.

[0073] Preferably, an overflow regulating valve 116 is provided on the return pipeline 106 from the water spray cooling device 103 to the inlet pipeline 104. If the steam flow rate of the inlet pipeline 104 exceeds the operation requirement of the high-temperature steam compressor 101, the overflow regulating valve 116 is opened to release the steam in the return pipeline 106. The overflow regulating valve 116 can be synchronously adjusted according to the pressure detection result of the first pressure detection device 110, and while discharging excess water, the valve action of the overflow regulating valve 116 stabilizes the steam pressure in the rotor cylinder.

[0074] Figure 3 The schematic diagram of the start-stop state of the quick start-stop system of the present invention and the conventional compressor is shown. As shown in the figure, the horizontal axis is used to represent the square of the steam flow rate, the vertical axis is used to represent the steam temperature, and N1 to N6 represent different speed ranges. Figure 1 and Figure 2The control method of the present invention will be described in detail.

[0075] In the initial stage, when the steam temperature in the inlet pipeline 104 of the high-temperature steam compressor 101 is low, the steam temperature is increased by the heating component 102. Before the unit is started, the electric gate valve 107 on the inlet pipeline 104 is opened, and the regulating valve 108 is opened in sequence. In this state, the throttled steam is always a small amount, and the regulating valve 108 can also be opened and closed at the same time. At this time, the heating component 102 is opened to the maximum power. The low-temperature steam provided by the external steam source is heated for the first time. At this time, the return valve 114 is closed, the outlet pipeline 105 and the return pipeline 106 are disconnected, and the steam pressure in the rotor cylinder will gradually rise to as the cylinder warms up. Figure 3 Point A on the green line.

[0076] The compressor is used to warm up the rotor cylinder with load to accelerate the temperature rise. When the temperature and pressure in the rotor cylinder reaches point A, the return valve 114 is opened to connect the outlet pipeline 105, the return pipeline 106 and the inlet pipeline 104, so that the steam in the rotor cylinder runs in a closed circuit. At the same time, the surge valve and the overflow regulating valve 116 are opened. At this time, the rapid start system drives the high-temperature steam compressor 101 to strengthen the steam flow and internal heat exchange, and the temperature of the rotor cylinder and the rotor metal is raised to 150°C.

[0077] The steam temperature of the inlet pipe 104 is raised as quickly as possible by controlling the water spraying amount of the water spray cooling device 103. The overflow regulating valve 116 is closed, the emergency pressure relief valve 117 is opened, the air in the quick start-stop system 100 is discharged, and the emergency pressure relief valve 117 is closed, and the warm-up is completed. The overflow regulating valve 116 is set to automatic control to ensure that the inlet steam pressure of the high-temperature steam compressor 101 is the rated operating pressure.

[0078] A fast start-stop system and control method provided by the present invention have the following advantages:

[0079] High-temperature steam compressor warm-up with load accelerates the temperature rise of rotor cylinder;

[0080] When the steam temperature at the inlet of the high-temperature steam compressor is low, it is heated by the heating component;

[0081] The inlet steam temperature of the high-temperature steam compressor is ensured by the amount of cooling water sprayed in the water spray cooling device.

[0082] It will be apparent to those skilled in the art that various modifications and variations may be made to the above exemplary embodiments of the present invention without departing from the spirit and scope of the present invention. Therefore, it is intended that the present invention covers modifications and variations of the present invention that fall within the scope of the appended claims and their equivalent technical solutions.

Claims

1. A rapid start-stop system, comprising a high-temperature steam compressor, a heating component, a water spray cooling device, an inlet pipeline, an outlet pipeline and a return pipeline, wherein: The inlet and outlet of the high-temperature steam compressor are connected to the inlet pipeline and the outlet pipeline respectively, the inlet pipeline is used to pass the steam provided by the external gas source through the rotor cylinder of the high-temperature steam compressor, and the outlet pipeline of the high-temperature steam compressor is connected to the inlet pipeline through the return pipeline to form a closed loop; The heating component is arranged on the inlet pipeline and is used to heat the steam in the inlet pipeline; The water spray cooling device is arranged on the return pipeline and is used to reduce the steam temperature in the return pipeline.

2. The rapid start-stop system according to claim 1, characterized in that: It also includes an electric gate valve and a regulating valve arranged on the inlet pipeline, the electric gate valve is used to open or close the inlet pipeline, and the regulating valve is used to adjust the steam flow in the inlet pipeline.

3. The rapid start-stop system according to claim 1, characterized in that: Also includes: A first flow detection device, a first pressure detection device and a first temperature detection device provided on the inlet pipeline, for detecting the flow rate, pressure and temperature of the steam in the inlet pipeline respectively; as well as A filter is arranged on the inlet pipeline.

4. The rapid start-stop system according to claim 1, characterized in that: It also includes a second pressure detection device and a second temperature detection device disposed on the outlet pipeline, which are used to detect the pressure and temperature of the steam in the outlet pipeline respectively.

5. The rapid start-stop system according to claim 1, characterized in that: A reflux valve is also included, which is connected between the outlet pipeline and the reflux pipeline.

6. The rapid start-stop system according to claim 5, characterized in that: Also included is an anti-surge valve connected in parallel with the reflux valve.

7. The rapid start-stop system according to claim 1, characterized in that: It also includes an overflow regulating valve arranged on the return pipeline from the water spray cooling device to the inlet pipeline.

8. A control method, applicable to the rapid start-stop system according to claim 1, characterized in that: The control method comprises the steps of: In the initial stage, the outlet pipeline and the return pipeline are disconnected, the heating component is turned on to heat the steam entering the inlet pipeline, and the high-temperature steam compressor is controlled to operate under load; Detecting the steam pressure of the rotor cylinder of the high-temperature steam compressor, if it reaches a set value, connecting the outlet pipeline and the return pipeline to keep the steam pressure of the rotor cylinder stable, and controlling the water spray cooling device to enter a semi-open and closed working state; The heating assembly and the water spray cooling device are adjusted, and the steam flow is adjusted through the return pipeline so that the steam flow, temperature and pressure of the inlet pipeline meet the operating requirements of the high-temperature steam compressor.

9. The control method according to claim 8, characterized in that: The outlet pipeline and the return pipeline are connected through a return valve. If the steam pressure of the rotor cylinder of the high-temperature steam compressor reaches a set value, the return valve is opened to allow the steam in the outlet pipeline to enter the return pipeline to keep the steam pressure of the rotor cylinder stable.

10. The control method according to claim 8, characterized in that: An overflow regulating valve is provided on the return pipeline from the water spray cooling device to the inlet pipeline. If the steam flow rate of the inlet pipeline exceeds the operating requirement of the high-temperature steam compressor, the overflow regulating valve is opened to release the steam in the return pipeline.

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