CN215409364U - Centrifugal compressor surge protection device based on dynamic control - Google Patents
Centrifugal compressor surge protection device based on dynamic control Download PDFInfo
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- CN215409364U CN215409364U CN202120297451.1U CN202120297451U CN215409364U CN 215409364 U CN215409364 U CN 215409364U CN 202120297451 U CN202120297451 U CN 202120297451U CN 215409364 U CN215409364 U CN 215409364U
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Abstract
The utility model discloses a centrifugal compressor surge protection device based on dynamic control belongs to turbine formula centrifugal compressor technical field, including compressor, one section prevent surge valve, two-stage section prevent surge valve, former PLC controller, industrial computer, photoelectric switch, optic fibre terminal box, optic fibre and net twine, one section prevents surge valve and two-stage section and prevents surge valve and install respectively in the export and the entry of each section of compressor, former PLC controller passes through photoelectric switch, optic fibre terminal box and the real-time communication of optic fibre realization with the industrial computer, the industrial computer realizes dynamic analysis according to the compressor parameter that feeds back to. The utility model solves the defect that the surge-proof valve is fully opened after the traditional turbine centrifugal compressor enters the surge line. The key data are transmitted to the industrial personal computer for operation, the reasonable anti-surge valve quick opening degree is given, the risk of stopping the compressor under the production fluctuation state is greatly reduced, and the fault tolerance of the whole production device is improved.
Description
Technical Field
The invention belongs to the technical field of turbine centrifugal compressors, and particularly relates to a centrifugal compressor surge protection device modification process based on dynamic control.
Background
A turbo compressor, which is a dynamic compressor having a high-speed rotating impeller; the working wheel (impeller) with blades arranged on a shaft is driven by a driving machine to rotate at a high speed, the final pressure required by gas is obtained through multi-stage combined compression, surging, also called flying, is an unstable operation state which makes the performance of a turbo compressor abnormal, the commonly used anti-surging technology at present is to guide the flow back to an inlet through an outlet to ensure that the suction flow of the compressor is larger than the surging flow, however, the surge is prevented by means of the control valve being completely opened after the surge enters the surge line of the compressor, this operation will cause the load of the machine set to become large, and the high-voltage electric control will be stopped due to sudden overload of the motor current, so a technical transformation is needed, on the premise of ensuring that the compressor does not surge, the operation parameters of the unit are maintained within a controllable range, so that the shutdown of the whole production device caused by the passive shutdown of the compressor is avoided.
Disclosure of Invention
The invention aims to provide a surge protection device of a centrifugal compressor based on dynamic control, which solves the problems in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme: a centrifugal compressor surge protection device transformation process based on dynamic control comprises a compressor, a gearbox, a motor, a first section surge prevention valve, a second section surge prevention valve, an original PLC, an industrial personal computer, a photoelectric switch, an optical fiber junction box, an optical fiber and a network cable, wherein the first section surge prevention valve and the second section surge prevention valve are respectively installed on a compressor inlet and a compressor outlet of each section of the compressor, the original PLC is electrically connected with the industrial personal computer through the photoelectric switch, the optical fiber junction box and the optical fiber and realizes real-time communication with the industrial personal computer, the first section surge prevention valve and the second section surge prevention valve are cancelled with a power-off full-on function and can be switched on rapidly in a step mode according to dynamic parameters, and the compressor is driven by the motor and the gearbox to operate.
In a preferred embodiment, the original PLC is connected with the DCS control room through an optical fiber, and the mode of single control by the original PLC is changed into the combined control by the original PLC and the industrial personal computer.
In a preferred embodiment, the industrial personal computer obtains the current operation coefficient of the compressor through calculation, and divides the coefficient value range into three zones, namely an anti-surge limit zone, an anti-surge circulation zone and an anti-surge safety zone.
As a preferred embodiment, when the compressor is operated in the anti-surge safety zone, the working condition is normal and no operation is required; when the compressor runs in the anti-surge circulation area, judging whether to execute operation by a user, and if so, controlling the PLC-CPU to perform linear anti-surge starting; when the compressor enters an anti-surge limit area, the industrial personal computer judges the distance between the current compressor running coefficient and an SLL anti-surge limit line, and then gives an anti-surge valve opening value, and signals are fed back to the PLC-CPU through the photoelectric switch, the optical fiber junction box and the optical fiber, so that the compressor can quickly open the first section of anti-surge valve or the second section of anti-surge valve to the specified opening according to requirements.
In a preferred embodiment, the PLC-CPU can be controlled in situ by an original PLC controller and remotely by an industrial personal computer.
In a preferred embodiment, the industrial personal computer performs dynamic analysis according to parameters fed back by the compressor, calculates quick opening data of the first-stage anti-surge valve and the second-stage anti-surge valve under the condition of a surge limit, and feeds back the quick opening data to the original PLC to control the opening of the first-stage anti-surge valve and the second-stage anti-surge valve.
The compressor comprises a photoelectric switch, an optical fiber junction box, a jumper wire, a coupler, a network cable and the like which are added in an original PLC cabinet of the compressor, an industrial personal computer, a photoelectric switch, an optical fiber junction box, a jumper wire, a coupler, a network cable and the like which are added in a DCS control room, the original PLC cabinet of the compressor is connected with the DCS control room through optical fibers, the original single control mode of the original PLC controller is changed into the combined control mode of the original PLC controller and the industrial personal computer, the surge SLL value of the compressor is recalculated in the industrial personal computer, a new anti-surge control strategy is adopted, the original quick-opening direct electromagnetic valve power-losing full-opening mode is cancelled, when the first section anti-surge valve and the second section anti-surge valve need to be quickly opened, a step response mode is adopted, the analysis processing can be carried out by calculating the surge curve of the compressor, and the working range of the compressor is divided into an anti-surge safety area, a surge safety area and a safety area by a Surge Control Line (SCL) and a Surge Limit Line (SLL) which are used for the compressor, The invention aims to solve the problem that when a compressor enters a surge area, the opening degree of a first section of anti-surge valve and a second section of anti-surge valve is judged by calculation, such as: according to the calculation, the anti-surge valve is opened for 30 percent, and if the working condition is continuously close to the Surge Limit Line (SLL), the anti-surge valve is continuously opened to 50 percent. By analogy, the opening degree of the first-section anti-surge valve and the second-section anti-surge valve is controlled by monitoring the temperature, the pressure and the flow data of the compressor in real time and comparing the data with the surge limit line of the compressor, so that excessive opening is avoided, a step-type opening strategy is adopted, the controllable quick opening of the first-section anti-surge valve and the second-section anti-surge valve is realized, the extreme opening strategy that the anti-surge valve is opened from 0 to 100 percent due to sudden power failure is not adopted, and the stability of the production process can be kept and surge can be prevented from occurring due to general parameter fluctuation.
The invention has the beneficial effects that:
the centrifugal compressor surge protection device modification process based on dynamic control solves the defect that after a traditional turbine type centrifugal compressor enters an anti-surge limit line, a 0-100% extreme opening strategy is achieved in a valve power-off mode, the stability of the production process is fully considered while the compressor anti-surge is effectively controlled, the compressor load is prevented from being increased sharply through a softer anti-surge strategy, and the high-voltage electric control is prevented from stopping due to sudden change and overload of motor current;
the centrifugal compressor surge protection device transformation process based on dynamic control realizes PLC remote control of the compressor in a form of adding a control device, namely an industrial personal computer, and obviously improves the automatic management level of the production process;
the compressor of the centrifugal compressor surge protection device transformation process based on dynamic control cannot have the condition of power surge, production operation is maintained, safe and stable operation of the compressor under reasonable working conditions is guaranteed, and the service life of equipment is prolonged.
Drawings
FIG. 1 is a process diagram of a turbine centrifugal compressor unit in a centrifugal compressor surge protection device based on dynamic control;
FIG. 2 is a block diagram of an optimized centrifugal compressor surge protection device in a dynamic control based centrifugal compressor surge protection device;
FIG. 3 is a graph of turbine centrifugal compressor performance in a centrifugal compressor surge protection device based on dynamic control.
In the figure: 1. a compressor inlet; 2. a separator; 3. a compressor; 4. a gearbox; 5. a motor; 6. a section of anti-surge valve; 7. a second section surge prevention valve; 8. a compressor outlet; 9. an original PLC controller; 10. a photoelectric switch; 11. an optical fiber junction box; 12. an industrial personal computer; 13. PLC-CPU; 14. A network cable; 15. an optical fiber; 16. an anti-surge limit zone; 17. an anti-surge circulation zone; 18. an anti-surge safety zone.
Detailed Description
The present invention will be further described with reference to the following examples.
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention. The conditions in the embodiments can be further adjusted according to specific conditions, and simple modifications of the method of the present invention based on the concept of the present invention are within the scope of the claimed invention.
Referring to fig. 1-3, the present invention provides a centrifugal compressor surge protection device based on dynamic control, including a compressor 3, a gearbox 4, a motor 5, a first section surge-proof valve 6, a second section surge-proof valve 7, an original PLC controller 9, an industrial personal computer 12, a photoelectric switch 10, an optical fiber junction box 11, an optical fiber 15 and a network cable 14, wherein the first section surge-proof valve 6 and the second section surge-proof valve 7 are respectively installed on a compressor inlet 1 and a compressor outlet 8 of each section of the compressor 3, the original PLC controller 9 is electrically connected with the industrial personal computer 12 through the photoelectric switch 10, the optical fiber junction box 11 and the optical fiber 15, and realizes real-time communication with the industrial personal computer 12, the first section surge-proof valve 6 and the second section surge-proof valve 7 cancel a power loss full-on function, and can perform a step-type fast-on according to dynamic parameters, and the compressor 3 is driven by the motor 5 and the gearbox 4 to operate.
The original PLC 9 is connected with the DCS control chamber through an optical fiber 15, so that the single control mode of the original PLC 9 is changed into the combined control of the original PLC 9 and the industrial personal computer 12.
The industrial personal computer 12 obtains the current operation coefficient of the compressor 3 through calculation, and divides the coefficient value range into three zones, namely an anti-surge limit zone 16, an anti-surge circulation zone 17 and an anti-surge safety zone 18.
When the compressor 3 is operating in the anti-surge safety zone 18, the operating conditions are normal and no operation is required; when the compressor 3 is operated in the anti-surge circulation zone 17, judging whether to execute the operation by a user, and if so, controlling the PLC-CPU13 to perform linear anti-surge opening; when the compressor 3 enters the anti-surge limit area 16, the industrial personal computer 12 judges the distance between the current running coefficient of the compressor 3 and the SLL anti-surge limit line, further provides an anti-surge valve opening value, and feeds back signals to the PLC-CPU13 through the photoelectric switch 10, the optical fiber junction box 11 and the optical fiber 15, so that the compressor 3 can rapidly open the first section of anti-surge valve 6 or the second section of anti-surge valve 7 to the specified opening according to requirements.
The PLC-CPU13 can be controlled by the original PLC 9 on site and the industrial personal computer 12 to realize remote control.
The industrial personal computer 12 carries out dynamic analysis according to the parameters fed back by the compressor 3, calculates the quick opening data of the first section anti-surge valve 6 and the second section anti-surge valve 7 under the condition of surge limit, and feeds back the quick opening data to the original PLC 9 to control the opening degree of the first section anti-surge valve 6 and the second section anti-surge valve 7.
The specific working process is as follows: in fig. 1, a medium firstly enters a separator 2 through a compressor inlet 1 to separate a gas phase and a liquid phase, and then enters a compressor 3 to perform first-stage compression and second-stage compression, the medium enters a downstream from a compressor outlet 8 after pressurization is finished, the compressor 3 is driven by a motor 5 and a gearbox 4 to do work, a first-stage compression anti-surge control device is a first-stage anti-surge valve 6, and a second-stage compression anti-surge control device is a second-stage anti-surge valve 7;
in fig. 2, a control line is newly added to an original PLC controller 9 and connected to a photoelectric switch 10, the photoelectric switch 10 is connected to an optical fiber junction box 11 through a network cable 14, the optical fiber junction box 11 is connected to the optical fiber junction box 11 and the photoelectric switch 10 on the DCS system through an optical fiber 15, and thus the purpose of communication between an industrial personal computer 12 and a PLC-CPU13 is achieved, at this time, the PLC-CPU13 may be controlled by the original PLC controller 9 on site, or remotely by the industrial personal computer 12;
in fig. 1-3, during the operation of the compressor 3, all the required pressure, flow and temperature data are transmitted to the industrial personal computer 12 through the PLC-CPU13, the industrial personal computer 12 obtains the current operation coefficient of the compressor 3 through calculation, and divides the coefficient value range into three zones, namely an anti-surge limit zone 16, an anti-surge circulation zone 17 and an anti-surge safety zone 18, when the compressor 3 operates in the anti-surge safety zone 18, the working condition is normal and no operation is needed; when the compressor 3 is operated in the anti-surge circulation zone 17, judging whether to execute the operation by a user, and if so, controlling the PLC-CPU13 to perform linear anti-surge opening; when the compressor 3 enters the anti-surge limit area 16, the industrial personal computer 12 judges the distance between the current running coefficient of the compressor 3 and the SLL anti-surge limit line, and further gives an anti-surge valve opening value, and signals are fed back to the PLC-CPU13 through the photoelectric switch 10, the optical fiber junction box 11 and the optical fiber 15, so that the compressor 3 can rapidly open the first section of anti-surge valve 6 or the second section of anti-surge valve 7 to the specified opening according to requirements; after the opening of the field valve is finished, a signal is fed back to the industrial personal computer 12, at the moment, the industrial personal computer 12 continuously judges the running state of the compressor 3 according to each parameter, if the compressor 3 is still in the anti-surge limit area 16, the anti-surge valve is further opened, and if the compressor 3 returns to the anti-surge circulation area 17 or the anti-surge safety area 18, the current situation is maintained or the PLC-CPU13 is used for carrying out normal linear control on the anti-surge valve, and the circulation is carried out.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides a centrifugal compressor surge protection device based on dynamic control, includes compressor (3), gearbox (4), motor (5), one section anti-surge valve (6), two sections anti-surge valve (7), former PLC controller (9), industrial computer (12), photoelectric switch (10), optic fibre terminal box (11), optic fibre (15) and net twine (14), its characterized in that: the first section of anti-surge valve (6) and the second section of anti-surge valve (7) are respectively arranged on a compressor inlet (1) and a compressor outlet (8) of each section of the compressor (3), and the original PLC (9) is electrically connected with the industrial personal computer (12) through the photoelectric switch (10), the optical fiber junction box (11) and the optical fiber (15) and realizes real-time communication with the industrial personal computer (12);
the first-stage surge-proof valve (6) and the second-stage surge-proof valve (7) cancel the power-off full-open function and can be rapidly opened in a step mode according to dynamic parameters;
the compressor (3) is driven by a motor (5) and a gearbox (4) to operate.
2. The centrifugal compressor surge protection device based on dynamic control of claim 1, wherein: the original PLC (9) is connected with the DCS control chamber through an optical fiber (15), so that the single control mode of the original PLC (9) is changed into the combined control of the original PLC (9) and the industrial personal computer (12).
3. The centrifugal compressor surge protection device based on dynamic control of claim 1, wherein: the industrial personal computer (12) obtains the current operation coefficient of the compressor (3) through calculation, and divides the coefficient value range into three regions, namely an anti-surge limit region (16), an anti-surge circulation region (17) and an anti-surge safety region (18).
4. The surge protection device for a centrifugal compressor based on dynamic control of claim 3, wherein: when the compressor (3) operates in an anti-surge safety zone (18), the working conditions are normal and operation is not needed; when the compressor (3) runs in the anti-surge circulation area (17), judging whether to execute operation or not by a user, and if so, controlling the PLC-CPU (13) to perform linear anti-surge opening; when the compressor (3) enters the anti-surge limit area (16), the industrial personal computer (12) judges the distance between the current running coefficient of the compressor (3) and the SLL anti-surge limit line, and further gives out an anti-surge valve opening value, and signals are fed back to the PLC-CPU (13) through the photoelectric switch (10), the optical fiber junction box (11) and the optical fiber (15), so that the compressor (3) can rapidly open the first section of anti-surge valve (6) or the second section of anti-surge valve (7) to the specified opening according to requirements.
5. The surge protection device for a centrifugal compressor based on dynamic control as claimed in claim 4, wherein: the PLC-CPU (13) can be controlled on site by the original PLC controller (9) and remotely by the industrial personal computer (12).
6. The centrifugal compressor surge protection device based on dynamic control of claim 1, wherein: the industrial personal computer (12) carries out dynamic analysis according to the parameters fed back by the compressor (3), calculates the quick opening data of the first section anti-surge valve (6) and the second section anti-surge valve (7) under the condition of surge limit, and feeds back the quick opening data to the original PLC (9) to control the opening degree of the first section anti-surge valve (6) and the second section anti-surge valve (7).
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| CN202120297451.1U CN215409364U (en) | 2021-02-02 | 2021-02-02 | Centrifugal compressor surge protection device based on dynamic control |
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| CN202120297451.1U CN215409364U (en) | 2021-02-02 | 2021-02-02 | Centrifugal compressor surge protection device based on dynamic control |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114857063A (en) * | 2022-04-13 | 2022-08-05 | 北京康吉森自动化科技有限公司 | Control method for turbine compressor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114857063A (en) * | 2022-04-13 | 2022-08-05 | 北京康吉森自动化科技有限公司 | Control method for turbine compressor |
| CN114857063B (en) * | 2022-04-13 | 2023-02-10 | 北京康吉森自动化科技有限公司 | Control method for turbine compressor |
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