CN116163983B - A centrifugal compressor surge protection method, device, equipment and storage medium - Google Patents
A centrifugal compressor surge protection method, device, equipment and storage medium Download PDFInfo
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- CN116163983B CN116163983B CN202211097585.4A CN202211097585A CN116163983B CN 116163983 B CN116163983 B CN 116163983B CN 202211097585 A CN202211097585 A CN 202211097585A CN 116163983 B CN116163983 B CN 116163983B
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- 238000000034 method Methods 0.000 title claims abstract description 56
- 230000009471 action Effects 0.000 claims abstract description 11
- 230000001276 controlling effect Effects 0.000 claims description 52
- 230000001133 acceleration Effects 0.000 claims description 19
- 238000004891 communication Methods 0.000 claims description 14
- 230000000630 rising effect Effects 0.000 claims description 14
- 238000004590 computer program Methods 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000013021 overheating Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/02—Surge control
- F04D27/0284—Conjoint control of two or more different functions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
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Abstract
The invention relates to a surge protection method, a device, equipment and a storage medium of a centrifugal compressor, and relates to the technical field of centrifugal compressors, wherein the method comprises the steps of acquiring the pressure of an air inlet and the rotating speed of an impeller in real time to obtain a pressure-rotating speed coordinate point; and controlling the PID regulator to select a preset speed regulation mode and controlling the action of the electric valve according to the position of the pressure-rotating speed coordinate point in a preset pressure-rotating speed coordinate graph so as to adjust the rotating speed of the impeller and the pressure of the air inlet to the preset rotating speed and the preset pressure, wherein the pressure-rotating speed coordinate graph comprises a normal operation area of the compressor, and the coordinate points of the preset rotating speed and the preset pressure are positioned in the normal operation area of the compressor. According to the invention, the PID regulator is controlled to select a preset speed regulation mode and the electric valve is controlled to act, so that the pressure of the air inlet and the rotating speed of the impeller are stably kept in the normal running area of the compressor, and therefore no surge occurs.
Description
Technical Field
The invention relates to the field of centrifugal compressors, in particular to a surge protection method, a surge protection device, surge protection equipment and a storage medium of a centrifugal compressor.
Background
At present, when the flow of an air inlet pipeline of a centrifugal compressor is reduced, the surge phenomenon is easy to occur, air at an exhaust port flows backward, so that the machine periodically vibrates, the machine is damaged, the flow range and the working efficiency of a compression system are affected, and the reliability and the safety of the system are also directly affected.
Disclosure of Invention
The invention provides a surge protection method, device and equipment for a centrifugal compressor and a storage medium, which are used for solving the problem that the centrifugal compressor in the prior art is easy to generate a surge phenomenon.
In order to solve the problems, the invention adopts the following technical scheme that:
In a first aspect, the present invention provides a surge protection method for a centrifugal compressor, the method being applied to a compressor, the compressor including a PID regulator, an electric valve, an impeller, and an air intake pipe, the air intake pipe including an air intake, the electric valve including a valve body, the valve body being disposed on the air intake, the PID regulator being connected to the impeller, the impeller being located on one side of the air intake pipe, the method comprising:
Acquiring the pressure of the air inlet and the rotating speed of the impeller in real time to obtain a pressure-rotating speed coordinate point;
And controlling the PID regulator to select a preset speed regulation mode and controlling the action of the electric valve according to the position of the pressure-rotating speed coordinate point in a preset pressure-rotating speed coordinate graph so as to adjust the rotating speed of the impeller and the pressure of the air inlet to the preset rotating speed and the preset pressure, wherein the pressure-rotating speed coordinate graph comprises a normal operation area of the compressor, and the coordinate points of the preset rotating speed and the preset pressure are positioned in the normal operation area of the compressor.
The method further comprises the steps that before the pressure of the air inlet and the rotating speed of the impeller are obtained in real time and the pressure-rotating speed coordinate point is obtained, the method further comprises the steps of:
Controlling the impeller to rotate at various rotating speeds and controlling the electric valve to close so as to adjust the sectional area of the air inlet, and recording the rotating speed of the impeller and the pressure of the air inlet to obtain a surging rotating speed pressure coordinate point when the surging phenomenon occurs to the air inlet if the surging phenomenon occurs to the air inlet;
Constructing a pressure-rotating speed coordinate system, and constructing a surge line in the pressure-rotating speed coordinate system according to the surge rotating speed pressure coordinate point;
Constructing a surge early warning line and an electric valve closing line according to the surge line;
and obtaining a pressure-rotating speed coordinate graph according to the pressure-rotating speed coordinate system, the surge line, the surge early warning line and the electric valve closing line, and determining a normal operation area of the compressor in the pressure-rotating speed coordinate graph according to the surge early warning line and the electric valve closing line.
The further technical scheme is that the construction of surge early warning line and electric valve closing line according to the surge line comprises:
and constructing a surge early-warning line according to the surge line, and constructing an electric valve closing line according to the surge early-warning line.
According to a further technical scheme, the speed regulation mode comprises an acceleration regulation mode, the PID regulator is controlled to select a preset speed regulation mode according to the position of the pressure-rotating speed coordinate point in a preset pressure-rotating speed coordinate graph, and the action of the electric valve is controlled to regulate the rotating speed of the impeller and the pressure of the air inlet to the preset rotating speed and the preset pressure, and the speed regulation mode comprises the following steps:
when a compressor starting instruction is received, the PID regulator is controlled to select the acceleration regulation mode to enable the rotating speed of the impeller to rise in an acceleration mode until reaching a preset rotating speed, and whether the pressure-rotating speed coordinate point is between the surge line and the surge early warning line is judged in real time in the rotating speed acceleration rising process of the impeller;
And if the pressure-rotating speed coordinate point is between the surge line and the surge early warning line, controlling the electric valve to open the valve body so as to reduce the pressure of the air inlet, and controlling the electric valve to close the valve body until the pressure-rotating speed coordinate point is below the closing line of the electric valve.
According to a further technical scheme, the speed regulation mode further comprises a constant pressure regulation mode, the PID regulator is controlled to select a preset speed regulation mode according to the position of the pressure-rotating speed coordinate point in a preset pressure-rotating speed coordinate graph, and the electric valve is controlled to act so as to regulate the rotating speed of the impeller and the pressure of the air inlet to the preset rotating speed and the preset pressure, and the speed regulation mode further comprises the following steps:
if the rotating speed of the impeller is accelerated to rise to a preset rotating speed, controlling the PID regulator to select the constant pressure regulating mode to regulate the rotating speed of the impeller, and judging the position of the pressure-rotating speed coordinate point in the pressure-rotating speed coordinate graph in real time;
And if the pressure-rotating speed coordinate point is between the surge line and the surge early warning line, controlling the electric valve to open the valve body so as to reduce the pressure of the air inlet and control the rotating speed of the impeller to rise, and controlling the electric valve to close the valve body until the pressure-rotating speed coordinate point is below the closing line of the electric valve.
According to a further technical scheme, if the rotation speed of the impeller is accelerated to rise to a preset rotation speed, the PID regulator is controlled to select the constant-pressure regulation mode to regulate the rotation speed of the impeller, and after the position of the pressure-rotation speed coordinate point in the pressure-rotation speed coordinate graph is judged in real time, the method further comprises the following steps:
if the pressure-rotating speed coordinate point is in the normal operation area of the compressor, judging whether the pressure of the air inlet rises in the normal operation area of the compressor in real time;
If the pressure of the air inlet rises in the normal operation area of the compressor, the rising value of the pressure of the air inlet is calculated, and the PID regulator is controlled to reduce the rotating speed of the impeller according to the rising value so as to keep the pressure of the air inlet constant.
According to a further technical scheme, if the pressure-rotating speed coordinate point is in the normal operation area of the compressor, whether the pressure of the air inlet rises is judged in real time, and the method further comprises the following steps:
If the pressure of the air inlet falls in the normal operation area of the compressor, a falling value of the pressure of the air inlet is calculated, and the PID regulator is controlled to lift the rotating speed of the impeller according to the falling value so as to keep the pressure of the air inlet constant.
In a second aspect, the invention also provides a surge protection device for a centrifugal compressor, comprising means for performing the method according to the first aspect.
In a third aspect, the present invention further provides an electronic device, including a processor, a communication interface, a memory, and a communication bus, where the processor, the communication interface, and the memory complete communication with each other through the communication bus;
A memory for storing a computer program;
And a processor configured to implement the steps of the method according to the first aspect when executing the program stored in the memory.
In a fourth aspect, the present invention also provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method of the first aspect.
Compared with the prior art, the technical scheme provided by the embodiment of the invention has the following advantages:
The method is applied to a compressor, the compressor comprises a PID regulator, an electric valve, an impeller and an air inlet pipe, the air inlet pipe comprises an air inlet, the electric valve comprises a valve body, the valve body is arranged on the air inlet, the PID regulator is connected with the impeller, the impeller is located on one side of the air inlet pipe, the method comprises the steps of obtaining the pressure of the air inlet and the rotating speed of the impeller in real time to obtain a pressure-rotating speed coordinate point, controlling the PID regulator to select a preset speed regulation mode according to the position of the pressure-rotating speed coordinate point in a preset pressure-rotating speed coordinate graph and controlling the action of the electric valve to regulate the rotating speed of the impeller and the pressure of the air inlet to the preset rotating speed and the preset pressure, wherein the pressure-rotating speed coordinate graph comprises a normal operation area of the compressor, and the coordinate point of the preset rotating speed and the preset pressure is located in the normal operation area of the compressor. Therefore, the pressure of the air inlet and the rotating speed of the impeller are stably kept in the normal running area of the compressor by controlling the PID regulator to select a preset speed regulation mode and controlling the electric valve to act, so that no surge occurs.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic flow chart of a surge protection method for a centrifugal compressor according to embodiment 1 of the present invention;
FIG. 2 is a block diagram of a surge protector for a centrifugal compressor according to embodiment 2 of the present invention;
fig. 3 is a schematic structural diagram of an electronic device according to embodiment 3 of the present invention;
fig. 4 is a schematic diagram of a graph of pressure versus rotational speed in an embodiment of the present invention.
Detailed Description
In order to more fully understand the technical content of the present invention, the following technical solutions of the present invention will be further described and illustrated with reference to specific embodiments, but are not limited thereto.
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the invention, are intended to be within the scope of the present invention.
It should be understood that the terms "comprises" and "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It should also be understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
Example 1
Referring to fig. 1 in combination with fig. 4, fig. 1 is a schematic flow chart of a surge protection method for a centrifugal compressor according to embodiment 1 of the present invention. The method is applied to a compressor, the compressor comprises a PID regulator, an electric valve, an impeller and an air inlet pipe, the air inlet pipe comprises an air inlet, the electric valve comprises a valve body, the valve body is arranged on the air inlet, the PID regulator is connected with the impeller, and the impeller is positioned on one side of the air inlet pipe. Specifically, as shown in fig. 1, the method includes the following steps S101 to S102.
S101, acquiring the pressure of the air inlet and the rotating speed of the impeller in real time, and obtaining a pressure-rotating speed coordinate point.
Specifically, a control unit in the compressor acquires the current rotating speed of the impeller in real time through a driver, acquires the pressure of the air inlet in real time through an air inlet pressure sensor, and obtains a pressure-rotating speed coordinate point at each moment according to the pressure of the air inlet at each moment and the rotating speed of the impeller.
S102, controlling the PID regulator to select a preset speed regulation mode and controlling the electric valve to act according to the position of the pressure-rotating speed coordinate point in a preset pressure-rotating speed coordinate graph so as to adjust the rotating speed of the impeller and the pressure of the air inlet to the preset rotating speed and the preset pressure.
Specifically, the pressure-rotation speed graph comprises a normal operation region of the compressor, and the coordinate points of the preset rotation speed and the preset pressure are located in the normal operation region of the compressor. Therefore, the pressure of the air inlet and the rotating speed of the impeller are stably kept in the normal running area of the compressor by controlling the PID regulator to select a preset speed regulation mode and controlling the electric valve to act, so that the compressor cannot surge. The preset rotating speed and the preset pressure are set by a user, and are the rotating speed and the pressure which can not surge under the stable working state of the compressor.
In an embodiment, before the acquiring the pressure of the air inlet and the rotation speed of the impeller in real time and obtaining the pressure-rotation speed coordinate point, the method further includes:
Controlling the impeller to rotate at various rotating speeds and controlling the electric valve to close so as to adjust the sectional area of the air inlet, and recording the rotating speed of the impeller and the pressure of the air inlet to obtain a surging rotating speed pressure coordinate point when the surging phenomenon occurs to the air inlet if the surging phenomenon occurs to the air inlet;
Constructing a pressure-rotating speed coordinate system, and constructing a surge line in the pressure-rotating speed coordinate system according to the surge rotating speed pressure coordinate point;
Constructing a surge early warning line and an electric valve closing line according to the surge line;
and obtaining a pressure-rotating speed coordinate graph according to the pressure-rotating speed coordinate system, the surge line, the surge early warning line and the electric valve closing line, and determining a normal operation area of the compressor in the pressure-rotating speed coordinate graph according to the surge early warning line and the electric valve closing line.
The control unit in the compressor records that the rotation speed of the impeller and the pressure of the air inlet obtain a surge rotation speed pressure coordinate point when a surge phenomenon occurs, then the rotation speed is taken as an independent variable x-axis, the air inlet pressure is taken as a dependent variable y-axis to construct a pressure-rotation speed coordinate system, a surge vibration line is constructed in the pressure-rotation speed coordinate system according to the surge rotation speed pressure coordinate point, a surge vibration line and an electric valve closing line are constructed according to the surge vibration line after the surge vibration line is constructed in the pressure-rotation speed coordinate system, and finally a pressure-rotation speed diagram is obtained according to the pressure-rotation speed coordinate system, the surge vibration line, the surge pre-warning line and the electric valve closing line, and a normal running area between the compressor and the electric valve is determined according to the surge vibration speed coordinate system, the surge vibration pre-warning line and the electric valve closing line. When the pressure-rotating speed coordinate point obtained in real time is located between the surge early warning line and the closing line of the electric valve, the electric valve does not act so as to prevent the electric valve from overheating caused by frequent actions of the electric valve.
In an embodiment, the constructing a surge warning line and an electric valve closing line according to the surge line includes:
and constructing a surge early-warning line according to the surge line, and constructing an electric valve closing line according to the surge early-warning line.
Specifically, the control unit in the compressor constructs a surge early warning line according to the surge line and constructs an electric valve closing line according to the surge early warning line after the surge early warning line is determined. And translating the position of the surge line in the pressure-rotating speed coordinate system downwards to obtain a surge early warning line, and translating the position of the surge early warning line in the pressure-rotating speed coordinate system downwards to obtain an electric valve control line.
In an embodiment, the speed regulation mode includes an acceleration regulation mode, and the controlling the PID regulator to select a preset speed regulation mode and controlling the electric valve to act according to the position of the pressure-rotation speed coordinate point in a preset pressure-rotation speed coordinate graph, so as to adjust the rotation speed of the impeller and the pressure of the air inlet to a preset rotation speed and a preset pressure includes:
when a compressor starting instruction is received, the PID regulator is controlled to select the acceleration regulation mode to enable the rotating speed of the impeller to rise in an acceleration mode until reaching a preset rotating speed, and whether the pressure-rotating speed coordinate point is between the surge line and the surge early warning line is judged in real time in the rotating speed acceleration rising process of the impeller;
And if the pressure-rotating speed coordinate point is between the surge line and the surge early warning line, controlling the electric valve to open the valve body so as to reduce the pressure of the air inlet, and controlling the electric valve to close the valve body until the pressure-rotating speed coordinate point is below the closing line of the electric valve.
Specifically, the acceleration adjustment mode is a compressor start-up phase in which the rotational speed of the impeller is rapidly brought from zero to a preset rotational speed, which is set by a user, in order to rapidly reach a standard intake pressure. In the acceleration adjustment mode, the PID regulator maintains maximum amplitude adjustment to rapidly increase the rotational speed of the impeller. The PID regulator has no constant pressure control and only outputs the maximum value when the compressor is started, the pressure is controlled by the electric valve, the rotation speed of the impeller is fast increased when the compressor is started, the pressure-rotation speed coordinate point easily reaches the coordinate on the surge line to trigger the compressor to surge, and the valve body is opened by the electric valve to increase the area of the air inlet when the pressure-rotation speed coordinate point is between the surge line and the surge early warning line to increase the air inlet flow, the pressure is delayed, and the pressure-rotation speed coordinate point is ensured not to reach the coordinate on the surge line to ensure that the surge cannot occur in the compressor starting stage.
In an embodiment, the speed regulation mode further includes a constant pressure regulation mode, and the controlling the PID regulator to select a preset speed regulation mode and controlling the electric valve to act according to the position of the pressure-rotation speed coordinate point in a preset pressure-rotation speed coordinate graph, so as to adjust the rotation speed of the impeller and the pressure of the air inlet to a preset rotation speed and a preset pressure, further includes:
if the rotating speed of the impeller is accelerated to rise to a preset rotating speed, controlling the PID regulator to select the constant pressure regulating mode to regulate the rotating speed of the impeller, and judging the position of the pressure-rotating speed coordinate point in the pressure-rotating speed coordinate graph in real time;
And if the pressure-rotating speed coordinate point is between the surge line and the surge early warning line, controlling the electric valve to open the valve body so as to reduce the pressure of the air inlet and control the rotating speed of the impeller to rise, and controlling the electric valve to close the valve body until the pressure-rotating speed coordinate point is below the closing line of the electric valve.
Specifically, in the acceleration adjustment mode, the PID regulator maintains the maximum amplitude adjustment to enable the rotation speed of the impeller to be rapidly increased, and when the rotation speed of the impeller is accelerated to a preset rotation speed, that is, the compressor reaches a stable state, the PID regulator is controlled to select the constant pressure adjustment mode to adjust the rotation speed of the impeller. The motor valve acts according to the surge early warning line and the motor valve closing line in the compressor starting stage or in the constant pressure regulating stage when the compressor is in a stable state, and the motor valve enables the rotating speed and the pressure of the compressor to rise along the surge early warning line in the compressor starting stage and still performs surge protection after the compressor enters the stable state. Therefore, even after the compressor enters a steady state, if the pressure-rotation speed coordinate point is between the surge line and the surge warning line, the electric valve is controlled to open the valve body to reduce the pressure of the air inlet and control the rotation speed of the impeller to rise, so that the pressure-rotation speed coordinate point is far away from the surge line until the pressure-rotation speed coordinate point is below the electric valve closing line, and the electric valve is controlled to close the valve body, thereby preventing an unexpected surge phenomenon when the compressor is in the steady state. Of course, the rotational speed of the impeller has a maximum rotational speed limit, and the rotational speed is always increased without reducing the pressure.
In an embodiment, if the rotational speed of the impeller increases to a preset rotational speed, the PID regulator is controlled to select the constant pressure regulation mode to regulate the rotational speed of the impeller, and after the position of the pressure-rotational speed coordinate point in the pressure-rotational speed coordinate graph is determined in real time, the method further includes:
if the pressure-rotating speed coordinate point is in the normal operation area of the compressor, judging whether the pressure of the air inlet rises in the normal operation area of the compressor in real time;
If the pressure of the air inlet rises in the normal operation area of the compressor, the rising value of the pressure of the air inlet is calculated, and the PID regulator is controlled to reduce the rotating speed of the impeller according to the rising value so as to keep the pressure of the air inlet constant.
Specifically, after the compressor reaches the constant pressure regulating stage through the starting stage, when the rotating speed of the impeller is accelerated to rise to a preset rotating speed, the PID regulator is controlled to conduct constant pressure regulation, the electric valve basically keeps to be closed at the moment, the regulation of the electric valve is little, and finally, the state that the rotating speed is constant, the pressure is constant, and the electric valve is closed is achieved. In this case, the pressure-rotation speed coordinate point is regulated by an electric valve except between the surge line and the surge warning line, namely, when the PID regulator performs constant pressure regulation, the pressure-rotation speed coordinate point basically operates in the normal operation region of the compressor, and only the PID regulator is controlled to perform slight regulation so as to keep the pressure of the air inlet constant, so that when the pressure-rotation speed coordinate point is in the normal operation region of the compressor, whether the pressure of the air inlet rises in the normal operation region of the compressor is judged in real time, and when the pressure of the air inlet rises in the normal operation region of the compressor, the rising value of the pressure of the air inlet is calculated, and the rotation speed of the impeller is controlled to be reduced according to the rising value by the PID regulator so as to keep the pressure of the air inlet constant.
The method provides surge protection for the compressor, enables the air inlet of the compressor to reach specified pressure quickly, ensures stable air inlet pressure through constant pressure control, and ensures stable air inlet pressure and stable impeller rotating speed so as to provide stable air quantity.
In an embodiment, if the pressure-rotation speed coordinate point is in the normal operation region of the compressor, the method further includes, after determining in real time whether the pressure of the air inlet rises,:
If the pressure of the air inlet falls in the normal operation area of the compressor, a falling value of the pressure of the air inlet is calculated, and the PID regulator is controlled to lift the rotating speed of the impeller according to the falling value so as to keep the pressure of the air inlet constant.
Specifically, therefore, when the pressure-rotation speed coordinate point is in the normal operation region of the compressor, whether the pressure of the air inlet rises in the normal operation region of the compressor is judged in real time, and when the pressure of the air inlet falls in the normal operation region of the compressor, a falling numerical value of the pressure of the air inlet is calculated, and the rotation speed of the impeller is raised by the PID regulator according to the falling numerical value so as to keep the pressure of the air inlet constant.
In a specific embodiment, the method is applied to a high-speed air knife machine, the air knife machine system comprises a high-speed motor, a frequency converter, an electric air inlet valve and a machine head, and a workpiece on a machine tool is fixed and processed by utilizing negative pressure (namely air inlet pressure) generated by an air inlet of the high-speed air knife machine. The control card software can set the pressure rotating speed point coordinates to form a surge line, the surge early warning line and the electric valve closing line divide the rotating speed and the pressure coordinates into different areas, and the electric air inlet valve performs different actions according to the position in the current pressure rotating speed point coordinate system to adjust the position of the pressure rotating speed point so as to avoid surging.
The air inlet of the fan is connected with the machine tool workbench through a pipeline, at the starting stage of machine tool operation, as the rotation speed of the motor rises quickly, the negative pressure in the pipeline rises quickly, and when the pressure and flow point reaches a surge area, surging can be caused, so that the electric air inlet valve is controlled to be opened when the pressure rotation speed point reaches a position between a surging early warning line and a surge line, the area of the air inlet is increased, the pressure of the air inlet is reduced, surging is avoided, and when the pressure rotation speed coordinate point is positioned below an electric valve closing line, the electric valve is automatically closed. In the stable operation of the machine tool, the electric valve is closed, the rotation speed is stable, the area change of the air inlet is small, the working pressure requirement can be ensured by closed-loop control and adjustment of the air inlet pressure, the material changing operation is carried out after the workpiece is processed, the machine tool is not stopped, the area of the air inlet is enlarged when the workpiece is taken down, the air inlet pressure is reduced, the running coordinate of a fan is far away from a surge area, the area of the air inlet is quickly reduced when the material is discharged, the air inlet pressure is quickly increased, and when the pressure rotation speed point coordinate is above a surge early warning line, the electric valve is opened, so that the surge is avoided.
Example 2
As shown in fig. 2, the embodiment of the present invention further provides a surge protection device 400 for a centrifugal compressor, where the device 400 includes a first acquisition unit 401 and a first control unit 402.
The first obtaining unit 401 is configured to obtain, in real time, the pressure of the air inlet and the rotation speed of the impeller, and obtain a pressure-rotation speed coordinate point.
The first control unit 402 is configured to control the PID regulator to select a preset speed regulation mode and control the electric valve to act according to a position of the pressure-rotation speed coordinate point in a preset pressure-rotation speed coordinate graph, so as to adjust the rotation speed of the impeller and the pressure of the air inlet to a preset rotation speed and a preset pressure, where the pressure-rotation speed coordinate graph includes a normal operation region of the compressor, and coordinate points of the preset rotation speed and the preset pressure are located in the normal operation region of the compressor.
In an embodiment, before the acquiring the pressure of the air inlet and the rotation speed of the impeller in real time and obtaining the pressure-rotation speed coordinate point, the method further includes:
Controlling the impeller to rotate at various rotating speeds and controlling the electric valve to close so as to adjust the sectional area of the air inlet, and recording the rotating speed of the impeller and the pressure of the air inlet to obtain a surging rotating speed pressure coordinate point when the surging phenomenon occurs to the air inlet if the surging phenomenon occurs to the air inlet;
Constructing a pressure-rotating speed coordinate system, and constructing a surge line in the pressure-rotating speed coordinate system according to the surge rotating speed pressure coordinate point;
Constructing a surge early warning line and an electric valve closing line according to the surge line;
and obtaining a pressure-rotating speed coordinate graph according to the pressure-rotating speed coordinate system, the surge line, the surge early warning line and the electric valve closing line, and determining a normal operation area of the compressor in the pressure-rotating speed coordinate graph according to the surge early warning line and the electric valve closing line.
In an embodiment, the constructing a surge warning line and an electric valve closing line according to the surge line includes:
and constructing a surge early-warning line according to the surge line, and constructing an electric valve closing line according to the surge early-warning line.
In an embodiment, the speed regulation mode includes an acceleration regulation mode, and the controlling the PID regulator to select a preset speed regulation mode and controlling the electric valve to act according to the position of the pressure-rotation speed coordinate point in a preset pressure-rotation speed coordinate graph, so as to adjust the rotation speed of the impeller and the pressure of the air inlet to a preset rotation speed and a preset pressure includes:
when a compressor starting instruction is received, the PID regulator is controlled to select the acceleration regulation mode to enable the rotating speed of the impeller to rise in an acceleration mode until reaching a preset rotating speed, and whether the pressure-rotating speed coordinate point is between the surge line and the surge early warning line is judged in real time in the rotating speed acceleration rising process of the impeller;
And if the pressure-rotating speed coordinate point is between the surge line and the surge early warning line, controlling the electric valve to open the valve body so as to reduce the pressure of the air inlet, and controlling the electric valve to close the valve body until the pressure-rotating speed coordinate point is below the closing line of the electric valve.
In an embodiment, the speed regulation mode further includes a constant pressure regulation mode, and the controlling the PID regulator to select a preset speed regulation mode and controlling the electric valve to act according to the position of the pressure-rotation speed coordinate point in a preset pressure-rotation speed coordinate graph, so as to adjust the rotation speed of the impeller and the pressure of the air inlet to a preset rotation speed and a preset pressure, further includes:
if the rotating speed of the impeller is accelerated to rise to a preset rotating speed, controlling the PID regulator to select the constant pressure regulating mode to regulate the rotating speed of the impeller, and judging the position of the pressure-rotating speed coordinate point in the pressure-rotating speed coordinate graph in real time;
And if the pressure-rotating speed coordinate point is between the surge line and the surge early warning line, controlling the electric valve to open the valve body so as to reduce the pressure of the air inlet and control the rotating speed of the impeller to rise, and controlling the electric valve to close the valve body until the pressure-rotating speed coordinate point is below the closing line of the electric valve.
In an embodiment, if the rotational speed of the impeller increases to a preset rotational speed, the PID regulator is controlled to select the constant pressure regulation mode to regulate the rotational speed of the impeller, and after the position of the pressure-rotational speed coordinate point in the pressure-rotational speed coordinate graph is determined in real time, the method further includes:
if the pressure-rotating speed coordinate point is in the normal operation area of the compressor, judging whether the pressure of the air inlet rises in the normal operation area of the compressor in real time;
If the pressure of the air inlet rises in the normal operation area of the compressor, the rising value of the pressure of the air inlet is calculated, and the PID regulator is controlled to reduce the rotating speed of the impeller according to the rising value so as to keep the pressure of the air inlet constant.
In an embodiment, if the pressure-rotation speed coordinate point is in the normal operation region of the compressor, the method further includes, after determining in real time whether the pressure of the air inlet rises,:
If the pressure of the air inlet falls in the normal operation area of the compressor, a falling value of the pressure of the air inlet is calculated, and the PID regulator is controlled to lift the rotating speed of the impeller according to the falling value so as to keep the pressure of the air inlet constant.
Example 3
Referring to fig. 3, the embodiment of the present invention further provides an electronic device, which includes a processor 111, a communication interface 112, a memory 113, and a communication bus 114, where the processor 111, the communication interface 112, and the memory 113 perform communication with each other through the communication bus 114.
A memory 113 for storing a computer program;
a processor 111 for executing a program stored on a memory 113 to implement the surge protection method of the centrifugal compressor as provided in embodiment 1.
The present embodiment also provides a computer readable storage medium having stored thereon a computer program which, when executed by the processor 111, implements the steps of the centrifugal compressor surge protection method as provided in embodiment 1.
It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.
The foregoing is only a specific embodiment of the invention to enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A surge protection method for a centrifugal compressor, the method being applied to the compressor, the compressor comprising a PID regulator, an electric valve, an impeller and an air intake pipe, the air intake pipe comprising an air inlet, the electric valve comprising a valve body, the valve body being disposed on the air inlet, the PID regulator being connected to the impeller, the impeller being located on one side of the air intake pipe, the method comprising:
constructing a pressure-rotating speed coordinate system, and constructing a surge line in the pressure-rotating speed coordinate system;
Constructing a surge early warning line and an electric valve closing line according to the surge line;
Obtaining a pressure-rotating speed coordinate graph according to the pressure-rotating speed coordinate system, the surge line, the surge early warning line and the electric valve closing line, and determining a normal operation area of a compressor in the pressure-rotating speed coordinate graph according to the surge early warning line and the electric valve closing line;
Controlling the PID regulator to select a preset speed regulation mode and controlling the action of the electric valve according to the position of the pressure-rotating speed coordinate point in a preset pressure-rotating speed coordinate graph so as to adjust the rotating speed of the impeller and the pressure of the air inlet to the preset rotating speed and the preset pressure, wherein the pressure-rotating speed coordinate graph comprises a normal operation area of the compressor, and the coordinate points of the preset rotating speed and the preset pressure are positioned in the normal operation area of the compressor;
And when the pressure-rotation speed coordinate point reaches a position between the surge early warning line and the surge line, controlling to open the electric valve, and when the pressure-rotation speed coordinate point is below the closing line of the electric valve, closing the electric valve.
2. The method of claim 1, wherein the acquiring the pressure of the intake port and the rotational speed of the impeller in real time further comprises, prior to obtaining the pressure-rotational speed coordinate point:
Controlling the impeller to rotate at various rotating speeds and controlling the electric valve to close so as to adjust the sectional area of the air inlet, and recording the rotating speed of the impeller and the pressure of the air inlet to obtain a surging rotating speed pressure coordinate point when the surging phenomenon occurs to the air inlet if the surging phenomenon occurs to the air inlet;
And constructing a pressure-rotating speed coordinate system, and constructing a surge line in the pressure-rotating speed coordinate system according to the surge rotating speed pressure coordinate point.
3. The surge protection method of a centrifugal compressor according to claim 1, wherein said constructing a surge warning line and an electric valve closing line from said surge line comprises:
and constructing a surge early-warning line according to the surge line, and constructing an electric valve closing line according to the surge early-warning line.
4. The surge protection method of a centrifugal compressor according to claim 1, wherein the governor mode includes an acceleration adjustment mode, the controlling the PID regulator to select a preset governor mode and controlling the motor valve action according to a position of the pressure-speed coordinate point in a preset pressure-speed coordinate map to adjust the rotational speed of the impeller and the pressure of the intake port to a preset rotational speed and a preset pressure includes:
when a compressor starting instruction is received, the PID regulator is controlled to select the acceleration regulation mode to enable the rotating speed of the impeller to rise in an acceleration mode until reaching a preset rotating speed, and whether the pressure-rotating speed coordinate point is between the surge line and the surge early warning line is judged in real time in the rotating speed acceleration rising process of the impeller;
And if the pressure-rotating speed coordinate point is between the surge line and the surge early warning line, controlling the electric valve to open the valve body so as to reduce the pressure of the air inlet, and controlling the electric valve to close the valve body until the pressure-rotating speed coordinate point is below the closing line of the electric valve.
5. The surge protection method of a centrifugal compressor according to claim 4, wherein the governor mode further comprises a constant pressure governor mode, wherein the PID regulator is controlled to select a preset governor mode and the electric valve is controlled to act according to a position of the pressure-speed coordinate point in a preset pressure-speed coordinate map, so as to adjust the rotational speed of the impeller and the pressure of the intake port to a preset rotational speed and a preset pressure, further comprising:
if the rotating speed of the impeller is accelerated to rise to a preset rotating speed, controlling the PID regulator to select the constant pressure regulating mode to regulate the rotating speed of the impeller, and judging the position of the pressure-rotating speed coordinate point in the pressure-rotating speed coordinate graph in real time;
And if the pressure-rotating speed coordinate point is between the surge line and the surge early warning line, controlling the electric valve to open the valve body so as to reduce the pressure of the air inlet and control the rotating speed of the impeller to rise, and controlling the electric valve to close the valve body until the pressure-rotating speed coordinate point is below the closing line of the electric valve.
6. The surge protection method of claim 5, wherein if the rotational speed of the impeller increases to a preset rotational speed, controlling the PID regulator to select the constant pressure adjustment mode to adjust the rotational speed of the impeller, and determining the position of the pressure-rotational speed coordinate point in the pressure-rotational speed coordinate map in real time, the method further comprises:
if the pressure-rotating speed coordinate point is in the normal operation area of the compressor, judging whether the pressure of the air inlet rises in the normal operation area of the compressor in real time;
If the pressure of the air inlet rises in the normal operation area of the compressor, the rising value of the pressure of the air inlet is calculated, and the PID regulator is controlled to reduce the rotating speed of the impeller according to the rising value so as to keep the pressure of the air inlet constant.
7. The surge protection method of claim 6, wherein if the pressure-rotation speed coordinate point is in the normal operation region of the compressor, the method further comprises, after determining in real time whether the pressure of the intake port increases:
If the pressure of the air inlet falls in the normal operation area of the compressor, a falling value of the pressure of the air inlet is calculated, and the PID regulator is controlled to lift the rotating speed of the impeller according to the falling value so as to keep the pressure of the air inlet constant.
8. A surge protection device for a centrifugal compressor, comprising means for performing the method according to any one of claims 1-7.
9. The electronic equipment is characterized by comprising a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory are communicated with each other through the communication bus;
A memory for storing a computer program;
a processor for implementing the steps of the method of any one of claims 1-7 when executing a program stored on a memory.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method according to any of claims 1-7.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102124230A (en) * | 2007-08-21 | 2011-07-13 | 嘉德纳丹佛德国有限公司 | Improvements in compressors control |
| CN104989661A (en) * | 2015-06-24 | 2015-10-21 | 上海诺地乐通用设备制造有限公司 | Anti-surge energy-saving control device of single-stage high-speed centrifugal air blower |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101921410B1 (en) * | 2017-01-23 | 2018-11-22 | 두산중공업 주식회사 | Method for controlling surge margin of gas turbine and extraction device for gas turbine |
| CN113339310B (en) * | 2021-07-19 | 2022-09-13 | 东北大学 | Compressor surge prediction control method based on magnetic suspension axial position control |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102124230A (en) * | 2007-08-21 | 2011-07-13 | 嘉德纳丹佛德国有限公司 | Improvements in compressors control |
| CN104989661A (en) * | 2015-06-24 | 2015-10-21 | 上海诺地乐通用设备制造有限公司 | Anti-surge energy-saving control device of single-stage high-speed centrifugal air blower |
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