CN110500295B - Automatic parallel operation method of multi-unit parallel centrifugal compressor unit - Google Patents
Automatic parallel operation method of multi-unit parallel centrifugal compressor unit Download PDFInfo
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- CN110500295B CN110500295B CN201910752528.7A CN201910752528A CN110500295B CN 110500295 B CN110500295 B CN 110500295B CN 201910752528 A CN201910752528 A CN 201910752528A CN 110500295 B CN110500295 B CN 110500295B
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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
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/08—Centrifugal pumps
- F04D17/10—Centrifugal pumps for compressing or evacuating
- F04D17/12—Multi-stage pumps
- F04D17/14—Multi-stage pumps with means for changing the flow-path through the stages, e.g. series-parallel, e.g. side-loads
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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
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
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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
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Abstract
The invention provides an automatic parallel operation method of a multi-machine parallel centrifugal compressor unit, which comprises the following steps: step one, setting a parallel operation target: step two, judging whether parallel operation is needed: step three, judging the running state of the centrifugal compressor: step four, starting the centrifugal compressor to be connected in parallel: step five, starting the centrifugal compressor; step six, pre-parallel operation: step seven, adjusting the loading state: step eight, closing the anti-surge regulating valve: and finishing the automatic parallel operation. The operation method of the invention adopts a multi-target control strategy, realizes the nodularization of the parallel operation process and realizes the full-automatic parallel operation process. By applying the invention, the parallel operation process does not need human intervention, the time consumption is short, the pressure fluctuation caused to the process device is small, and the parallel operation method is safer and more reliable.
Description
Technical Field
The invention belongs to the field of turbo compressors, relates to a multi-unit parallel centrifugal compressor unit, and particularly relates to an automatic parallel operation method of the multi-unit parallel centrifugal compressor unit.
Background
The single-shaft centrifugal compressor is widely applied to the process industry and has the characteristics of stable operation and high reliability. In recent years, the trend of increasing the size of the device has been increasingly apparent in order to improve the unit energy efficiency index of the device operation. In many large devices, the required process equipment compressors are also enlarged synchronously, but after the equipment exceeds a certain specification, the equipment has a plurality of difficulties such as design, manufacture, transportation and the like. At the moment, if a plurality of units are connected in parallel, the equipment specification is reduced, and the design, manufacture and transportation difficulty is reduced. Meanwhile, the number of the single unit can be increased or decreased, so that the operation adjusting range of the whole unit is widened, and less influence on a process device can be realized when the compressor equipment needs to be overhauled.
However, the parallel connection of multiple machines brings complexity to the operation of the running machine set, and particularly, the parallel connection process in the process of multiple machine running needs to be well understood about the characteristics of the compressor, which brings challenges to the skill level of operators of terminal clients: the parallel operation process has long duration, great operation difficulty and easy repeated operation.
The long-distance pipeline compressor unit of our country is a typical multi-unit parallel operation working condition unit, and in the prior art, no efficient operation method exists, so that full-automatic control in the multi-unit parallel operation process is realized, and the conventional unit is completed by manual operation of a compressor operator. The requirement on the skill level of operators is high, the parallel operation time is long, and the unit operation fault caused by human factors is easy to occur. In the parallel operation process of manual operation at present, the condition of reducing the load of the existing operation unit can occur, so that the pressure fluctuation of the whole process device is caused, and negative influence is generated on production.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an automatic parallel operation method of a multi-unit parallel centrifugal compressor unit, and solve the technical problems of high difficulty, high working strength and poor reliability in multi-unit parallel operation of the compressor unit in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
an automatic parallel operation method of a multi-parallel centrifugal compressor unit comprises the steps that the multi-parallel centrifugal compressor unit comprises a plurality of centrifugal compressors, an air inlet manifold and an air outlet manifold which are connected in parallel, each centrifugal compressor is connected with the air inlet manifold through an air inlet branch pipe, each centrifugal compressor is connected with the air outlet manifold through an air outlet branch pipe, and the air outlet branch pipe and the air inlet branch pipe are connected through a backflow branch pipe which is connected with the centrifugal compressors in parallel; the centrifugal compressor is driven by a variable-frequency speed-regulating motor;
the monitoring system is distributed on the multi-unit parallel centrifugal compressor unit and comprises a unit controller, the unit controller is connected with a plurality of single-unit load controllers, the input end of each single-unit load controller is connected with an air inlet pressure sensor, an air outlet pressure sensor, a flow sensor, a valve position feedback sensor and a rotating speed sensor, and the output end of each single-unit load controller is connected with a valve position actuator and a rotating speed controller; the unit controller is also connected with a first operation panel, an air inlet manifold pressure sensor and an air outlet manifold pressure sensor;
each centrifugal compressor is provided with a corresponding single machine load controller; the air inlet branch pipe is provided with an air inlet pressure sensor and a flow meter, the flow meter is provided with a flow sensor, the air outlet branch pipe is provided with an air outlet pressure sensor and a check valve, the backflow branch pipe is provided with a cooler and an anti-surge regulating valve, and the anti-surge regulating valve is provided with a valve position feedback sensor; a rotating speed sensor is arranged on the variable-frequency speed regulating motor; the air inlet manifold is provided with an air inlet manifold pressure sensor, and the air outlet manifold is provided with an air outlet manifold pressure sensor; the anti-surge regulating valve is provided with a valve position actuator, and the variable frequency speed regulating motor is provided with a rotating speed controller;
the method comprises the following steps:
step one, setting a parallel operation target:
setting a lower pressure limit value PS2 of an inlet header and a target pressure value PS3 of an outlet header in the unit controller through a first operation panel, and taking the lower pressure limit value PS2 of the inlet header and the target pressure value PS3 of the outlet header as parallel targets;
step two, judging whether parallel operation is needed:
setting a priority order of each centrifugal compressor of a plurality of centrifugal compressors connected in parallel in a unit controller; comparing a pressure value P00 fed back by an inlet header pressure sensor with a lower limit value PS2 of the pressure of an inlet header in the unit controller, and comparing a pressure value P01 fed back by an outlet header pressure sensor with a target value PS3 of the pressure of an outlet header;
when the real-time value of P00 is greater than PS2 and the real-time value of P01 is less than PS3, executing step three, otherwise, the unit controller feeds back the process running condition of the multi-parallel centrifugal compressor unit and does not perform parallel operation;
step three, judging the running state of the centrifugal compressor:
according to the rotating speed fed back by the rotating speed sensor, the running state judgment of each centrifugal compressor is carried out in the unit controller:
when all the rotating speeds are less than or equal to 20r/min, no centrifugal compressor runs, and the step five is executed;
when all the rotating speeds are greater than the lowest working condition operating rotating speed, all the centrifugal compressors are in operation, the unit controller feeds back the non-parallel centrifugal compressors and does not perform parallel operation;
otherwise, a part of the centrifugal compressors are in operation, the centrifugal compressor which is in operation in the plurality of centrifugal compressors connected in parallel is defined as an operation centrifugal compressor, and the centrifugal compressor which is not in operation is defined as a centrifugal compressor to be connected in parallel, and then the fourth step is executed;
step four, starting the centrifugal compressor to be connected in parallel:
selecting one centrifugal compressor to be connected in parallel from the centrifugal compressors to be connected in parallel according to the priority sequence of the step two;
step 41, controlling the centrifugal compressor to run by the unit controller, taking the rotating speed fed back by the rotating speed sensor in the step three as a set rotating speed, and running the centrifugal compressor safely without participating in load regulation, namely running the centrifugal compressor to enter a constant rotating speed running control mode;
step 42, after the centrifugal compressor is operated to enter a constant rotating speed operation control mode, the outlet header pressure sensor acquires a pressure value PS1 of the outlet header in real time, and PS1+20kPa is used as a target pressure value of an outlet branch pipe of a single-machine load controller of the centrifugal compressor to be connected in parallel;
43, controlling the centrifugal compressor to be connected in parallel to be normally started by the single-machine load controller, and operating at the lowest working condition operation rotating speed after starting;
step 44, according to the target pressure value of the gas outlet branch pipe of the single-machine load controller of the centrifugal compressor to be connected in parallel in the step 42, controlling the load of the centrifugal compressor to be connected in parallel by the single-machine load controller until the collected pressure value of the gas outlet pressure sensor is equal to the target pressure value of the gas outlet branch pipe, and then performing constant-pressure PID adjustment on the centrifugal compressor to be connected in parallel;
step five, starting the centrifugal compressor:
when no centrifugal compressor runs, selecting at least one centrifugal compressor from the plurality of centrifugal compressors connected in parallel according to the priority sequence of the second step, controlling normal starting through a corresponding single-machine load controller, taking the started centrifugal compressor as the running centrifugal compressor, and then returning to the fourth step;
step six, pre-parallel operation:
taking the pressure value PS2-20kPa of the inlet manifold collected in the first step as a target pressure value of the inlet branch pipe, taking the pressure value PS3+20kPa of the outlet manifold collected in the first step as a target pressure value of the outlet branch pipe, respectively transmitting the pressure values to a single-machine load controller corresponding to the centrifugal compressor to be operated and a single-machine load controller corresponding to the centrifugal compressor to be connected in parallel through a unit controller, respectively controlling the load loading of the centrifugal compressor to be operated and the centrifugal compressor to be connected in parallel until the pressure values of the inlet branch pipe of the centrifugal compressor to be operated and the centrifugal compressor to be connected in parallel are equal to the target pressure value of the inlet branch pipe, and the pressure value of the outlet branch pipe is equal to the target pressure;
step seven, adjusting the loading state:
after the pre-parallel operation is completed, judging the loading states of the operating centrifugal compressor and the centrifugal compressor to be connected in parallel: when the real-time value acquired by the air outlet header pressure sensor reaches PS 3-PS 3+20kPa or when the real-time value acquired by the air inlet header pressure sensor reaches low limit PS 2-PS 2-20kPa, the loading is finished, otherwise, the single-machine load controller respectively controls the centrifugal compressor to operate and the centrifugal compressor to be connected in parallel to continue loading until the conditions are met, and the loading is finished;
step eight, closing the anti-surge regulating valve:
and (2) for the operating centrifugal compressor and the centrifugal compressor to be connected in parallel, acquiring the valve opening of the anti-surge regulating valve in real time through a valve position feedback sensor, judging the valve opening of the anti-surge regulating valve, and when the valve opening is larger than 0 +/-0.5%, the anti-surge regulating valve has an opening, and under the premise of keeping the pressure of the air outlet header pipe stable, carrying out load regulation on the operating centrifugal compressor and/or the centrifugal compressor to be connected in parallel under the control of a unit controller until the anti-surge regulating valves of the operating centrifugal compressor and the centrifugal compressor to be connected in parallel are completely closed through a valve position actuator, so that the automatic parallel operation is completed.
The invention also has the following distinguishing technical characteristics:
the centrifugal compressor adopts a single-shaft single-section type centrifugal compressor.
A speed change gear box is arranged between the variable frequency speed regulating motor and the centrifugal compressor.
The unit controller is also connected with a remote controller, and the remote controller is connected with a second operation panel.
The lowest working condition operation rotating speed is 3000-6000 r/min.
Compared with the prior art, the invention has the following technical effects:
the operation method of the invention adopts a multi-target control strategy, realizes the nodularization of the parallel operation process and realizes the full-automatic parallel operation process. By applying the invention, the parallel operation process does not need human intervention, the time consumption is short, the pressure fluctuation caused to the process device is small, and the parallel operation method is safer and more reliable.
Drawings
Fig. 1 is a schematic diagram of the connection relationship between the multi-parallel centrifugal compressor unit and the monitoring system according to the present invention.
Fig. 2 is a schematic diagram of the connection relationship of the monitoring system.
The meaning of the individual reference symbols in the figures is: 1-centrifugal compressor, 101-running centrifugal compressor, 102-centrifugal compressor to be connected in parallel, 2-inlet manifold, 3-outlet manifold, 4-inlet branch pipe, 5-outlet branch pipe, 6-return branch pipe, 7-variable frequency speed regulating motor, 8-unit controller, 9-single-unit load controller, 10-inlet pressure sensor, 11-outlet pressure sensor, 12-flow sensor, 13-valve position feedback sensor, 14-rotating speed sensor, 15-valve position actuator, 16-rotating speed controller, 17-first operation panel, 18-inlet manifold pressure sensor, 19-outlet manifold pressure sensor, 20-remote controller, 21-second operation panel, 22-flowmeter, 23-check valve, 24-cooler, 25-antisurge regulating valve.
The present invention will be explained in further detail with reference to examples.
Detailed Description
How to provide a configuration scheme of a multi-machine parallel centrifugal press unit and an operation method of automatic parallel operation, which solve the control problem of automatic parallel operation in the multi-machine parallel operation, and is the problem to be solved by the invention. The invention is obtained by deep research on the characteristics of the centrifugal compressor and by combining the practice of a typical process scheme with the multi-party discussion of equipment, design houses, project party field operators and the like. The method has good effect, and solves the problems of complex operation in the parallel operation process, long parallel operation time and easy fluctuation to a process system. As a part of intelligent control, the invention lays the technical foundation of 'unattended' of a multi-machine parallel operation unit, and combines the related 'one-key starting' technology to make the intelligent level of the industrial process compressor unit equipment step a new step. Therefore, the invention has good popularization value.
The following embodiments of the present invention are provided, and it should be noted that the present invention is not limited to the following embodiments, and all equivalent changes based on the technical solutions of the present invention are within the protection scope of the present invention.
Example 1:
following the above technical solution, as shown in fig. 1 and fig. 2, this embodiment provides an automatic parallel operation method for a multi-unit parallel centrifugal compressor unit, where the multi-unit parallel centrifugal compressor unit includes a plurality of centrifugal compressors 1 connected in parallel, an inlet manifold 2 and an outlet manifold 3, each centrifugal compressor 1 is connected to the inlet manifold 2 through an inlet branch pipe 4, each centrifugal compressor 1 is connected to the outlet manifold 3 through an outlet branch pipe 5, and the outlet branch pipe 5 and the inlet branch pipe 4 are connected through a return branch pipe 6 connected to the centrifugal compressor 1 in parallel; the centrifugal compressor 1 is driven by a variable frequency speed regulating motor 7;
the monitoring system is distributed on the multi-unit parallel centrifugal compressor unit and comprises a unit controller 8, the unit controller 8 is connected with a plurality of single-unit load controllers 9, the input end of each single-unit load controller 9 is connected with an air inlet pressure sensor 10, an air outlet pressure sensor 11, a flow sensor 12, a valve position feedback sensor 13 and a rotating speed sensor 14, and the output end of each single-unit load controller 9 is connected with a valve position actuator 15 and a rotating speed controller 16; the unit controller 8 is also connected with a first operation panel 17, an air inlet header pressure sensor 18 and an air outlet header pressure sensor 19;
each centrifugal compressor 1 is provided with a corresponding single machine load controller 9; the inlet branch pipe 4 is provided with an inlet pressure sensor 10 and a flowmeter 22, the flowmeter 22 is provided with a flow sensor 12, the outlet branch pipe 5 is provided with an outlet pressure sensor 11 and a check valve 23, the return branch pipe 6 is provided with a cooler 24 and an anti-surge regulating valve 25, and the anti-surge regulating valve 25 is provided with a valve position feedback sensor 13; a rotating speed sensor 14 is arranged on the variable-frequency speed regulating motor 7; an inlet manifold pressure sensor 18 is arranged on the inlet manifold 2, and an outlet manifold pressure sensor 19 is arranged on the outlet manifold 3; the anti-surge regulating valve 25 is provided with a valve position actuator 15, and the variable frequency speed regulating motor 7 is provided with a rotating speed controller 16;
the method comprises the following steps:
step one, setting a parallel operation target:
setting a lower pressure limit PS2 of intake manifold 2 and a target pressure value PS3 of outlet manifold 3 in machine set controller 8 via first control panel 17, and setting lower pressure limit PS2 of intake manifold 2 and target pressure value PS3 of outlet manifold 3 as a parallel operation target;
step two, judging whether parallel operation is needed:
setting a priority order of each centrifugal compressor 1 of the plurality of centrifugal compressors connected in parallel in the unit controller 8; comparing the pressure value P00 fed back by the inlet header pressure sensor 18 with the lower limit value PS2 of the pressure of the inlet header 2, and comparing the pressure value P01 fed back by the outlet header pressure sensor 19 with the target value PS3 of the pressure of the outlet header 3 in the unit controller 8;
when the real-time value of P00 is greater than PS2 and the real-time value of P01 is less than PS3, executing step three, otherwise, the unit controller 8 feeds back the process running condition of the multi-parallel centrifugal compressor unit and does not perform parallel operation;
step three, judging the running state of the centrifugal compressor:
in the unit controller 8, an operating state determination is made for each centrifugal compressor 1 on the basis of the rotational speed fed back from the rotational speed sensor:
when all the rotating speeds are less than or equal to 20r/min, the centrifugal compressor 1 does not operate, and the step five is executed;
when all the rotating speeds are greater than the lowest working condition operating rotating speed, all the centrifugal compressors 1 are in operation, and the unit controller 8 feeds back the non-parallel centrifugal compressors 1 without parallel operation;
otherwise, a part of the centrifugal compressors 1 are in operation, the centrifugal compressor 1 which is in operation in the plurality of centrifugal compressors connected in parallel is defined as an operating centrifugal compressor 101, and the centrifugal compressor 1 which is not in operation is defined as a centrifugal compressor 102 to be connected in parallel, and then the fourth step is executed;
step four, starting the centrifugal compressor to be connected in parallel:
selecting one centrifugal compressor 102 to be connected in parallel from the centrifugal compressors 102 to be connected in parallel according to the priority sequence of the step two;
step 41, controlling the centrifugal compressor 101 to operate by the unit controller 8, wherein the rotational speed fed back by the rotational speed sensor in the step three is used as a set rotational speed for operation, and the centrifugal compressor 101 is operated safely without participating in load regulation, namely, the centrifugal compressor 101 is operated to enter a constant rotational speed operation control mode;
step 42, after the centrifugal compressor 101 is operated to enter a constant rotating speed operation control mode, the outlet header pressure sensor 19 collects a pressure value PS1 of the outlet header 3 in real time, and PS1+20kPa is used as a target pressure value of an outlet branch pipe of the single-machine load controller 9 of the centrifugal compressor 102 to be connected in parallel;
43, the single-machine load controller 9 controls the centrifugal compressor 102 to be connected in parallel to be normally started, and the centrifugal compressor operates at the lowest working condition operation rotating speed after being started;
step 44, according to the target pressure value of the gas outlet branch pipe of the single-machine load controller 9 of the centrifugal compressor 102 to be connected in parallel in step 42, the single-machine load controller 9 controls the load of the centrifugal compressor 102 to be connected in parallel until the pressure value acquired by the gas outlet pressure sensor 11 is equal to the target pressure value of the gas outlet branch pipe, and then the centrifugal compressor 102 to be connected in parallel performs constant-pressure PID regulation;
step five, starting the centrifugal compressor:
when no centrifugal compressor 1 runs, selecting at least one centrifugal compressor 1 from the plurality of centrifugal compressors 1 connected in parallel according to the priority sequence of the step two, controlling normal starting through the corresponding single-machine load controller 1, taking the started centrifugal compressor 1 as the running centrifugal compressor 101, and then returning to the step four;
step six, pre-parallel operation:
taking the pressure value PS2-20kPa of the inlet manifold 2 collected in the first step as a target pressure value of an inlet branch pipe, taking the pressure value PS3+20kPa of the outlet manifold 3 collected in the first step as a target pressure value of an outlet branch pipe, respectively transmitting the pressure value PS3+20kPa of the outlet manifold 3 collected in the first step to a single-machine load controller 9 corresponding to the centrifugal compressor 101 to be operated and a single-machine load controller 9 corresponding to the centrifugal compressor 102 to be connected in parallel through a unit controller 8, respectively controlling the load loading of the centrifugal compressor 101 to be operated and the centrifugal compressor 1 to be connected in parallel until the pressure values of the inlet branch pipes of the centrifugal compressor 101 to be operated and the centrifugal compressor 102 to be connected in parallel are equal to the target pressure value of the inlet branch pipes;
step seven, adjusting the loading state:
after the pre-parallel operation is completed, judging the loading states of the operating centrifugal compressor 101 and the centrifugal compressor to be connected in parallel 102: when the real-time value collected by the air outlet header pressure sensor 19 reaches PS 3E
PS3+20kPa or when the real-time value collected by the intake manifold pressure sensor 18 reaches a lower limit
PS 2-PS 2-20kPa, the loading is finished, otherwise, the single machine load controller 8 respectively controls the operation centrifugal compressor 101 and the centrifugal compressor to be connected in parallel 102 to continue loading until the conditions are met, and the loading is finished;
step eight, closing the anti-surge regulating valve:
for the operation centrifugal compressor 101 and the centrifugal compressor 102 to be connected in parallel, the valve opening degree of the anti-surge regulating valve 25 is acquired in real time through the valve position feedback sensor 13, the valve opening degree of the anti-surge regulating valve 25 is judged, when the valve opening degree is more than 0 +/-0.5%, the anti-surge regulating valve 25 has the opening degree, under the control of the unit controller 8, the load regulation is carried out on the operation centrifugal compressor 101 and/or the centrifugal compressor 102 to be connected in parallel on the premise that the pressure of the air outlet header 3 is kept stable, until the anti-surge regulating valve 25 of the operation centrifugal compressor 101 and the centrifugal compressor 102 to be connected in parallel is completely closed through the valve position actuator 15, and the automatic parallel operation is completed.
As a preferable mode of the present embodiment, the centrifugal compressor 1 is a single-shaft single-stage centrifugal compressor.
As a preferable scheme of the embodiment, a speed change gear box is arranged between the variable frequency speed control motor 7 and the centrifugal compressor 1.
As a preferable scheme of this embodiment, the unit controller 8 is further connected with a remote controller 20, and the remote controller 20 is connected with a second operation panel 21. And the remote control is convenient.
As a preferred scheme of the embodiment, the lowest working condition operation rotating speed is 3000-6000 r/min. The lowest working condition running rotating speed is set to a specific rotating speed value in a specific multi-machine parallel centrifugal compressor unit according to the actual working condition.
Application example:
in a certain natural gas pipeline transportation gas station project, 3 centrifugal compressor units which are connected in parallel and provided with centrifugal compressors are arranged in the station, and the design scheme is dual-purpose one; the parameters of the unit operation are as follows: designing an air inlet pressure of 9MPa (G), an exhaust pressure of 11MPa (G), a lowest operation rotating speed of 3120r/min of the unit and a rated rotating speed of 4800r r/min; three units are directly connected and driven by high-speed variable-frequency synchronous motors, and the single machine rated power of the centrifugal compressor is 10 MW. According to the actual operation requirements of the station yard, taking the initial state as one operating centrifugal compressor and two centrifugal compressors to be connected in parallel as an example, the automatic parallel operation is carried out according to the operation method in the embodiment 1. Wherein: in the first step, the lower limit PS2 of the pressure of the inlet header 2 is 8.6MPa, and the target PS3 of the pressure of the outlet header 3 is 11 MPa. In step 41, the rotational speed of the centrifugal compressor 101 in the constant rotational speed operation control mode is 4500 r/min. In step 42, the outlet header pressure sensor 19 collects the pressure value PS1 of the outlet header 3 in real time, which is 10.6 MPa. The lowest working condition running speed of the centrifugal compressor is 3120 r/min. And finally, two operating centrifugal compressors are realized, one centrifugal compressor to be connected in parallel is continuously subjected to automatic parallel operation according to the operation method in the embodiment 1, and finally, three operating centrifugal compressors are realized.
By the automatic parallel operation method provided by the invention, all processes are unattended. The automatic control program practice is combined, so that the automatic and reliable parallel operation during the parallel operation of multiple machines is realized, and the parallel operation time and the field operation workload are reduced.
Claims (5)
1. An automatic parallel operation method of a multi-unit parallel centrifugal compressor unit comprises the steps that the multi-unit parallel centrifugal compressor unit comprises a plurality of centrifugal compressors (1) connected in parallel, an air inlet header (2) and an air outlet header (3), each centrifugal compressor (1) is connected with the air inlet header (2) through an air inlet branch pipe (4), each centrifugal compressor (1) is connected with the air outlet header (3) through an air outlet branch pipe (5), and the air outlet branch pipe (5) and the air inlet branch pipe (4) are connected through a backflow branch pipe (6) connected with the centrifugal compressors (1) in parallel; the centrifugal compressor (1) is driven by a variable-frequency speed-regulating motor (7); the method is characterized in that:
the monitoring system is distributed on the multi-unit parallel centrifugal compressor unit and comprises a unit controller (8), the unit controller (8) is connected with a plurality of unit load controllers (9), the input end of each unit load controller (9) is connected with an air inlet pressure sensor (10), an air outlet pressure sensor (11), a flow sensor (12), a valve position feedback sensor (13) and a rotating speed sensor (14), and the output end of each unit load controller (9) is connected with a valve position actuator (15) and a rotating speed controller (16); the unit controller (8) is also connected with a first operation panel (17), an inlet manifold pressure sensor (18) and an outlet manifold pressure sensor (19);
each centrifugal compressor (1) is provided with a corresponding single machine load controller (9); an air inlet pressure sensor (10) and a flow meter (22) are arranged on the air inlet branch pipe (4), a flow sensor (12) is installed on the flow meter (22), an air outlet pressure sensor (11) and a check valve (23) are arranged on the air outlet branch pipe (5), a cooler (24) and an anti-surge regulating valve (25) are arranged on the backflow branch pipe (6), and a valve position feedback sensor (13) is arranged on the anti-surge regulating valve (25); a rotating speed sensor (14) is arranged on the variable-frequency speed regulating motor (7); an air inlet manifold pressure sensor (18) is arranged on the air inlet manifold (2), and an air outlet manifold pressure sensor (19) is arranged on the air outlet manifold (3); a valve position actuator (15) is arranged on the anti-surge regulating valve (25), and a rotating speed controller (16) is arranged on the variable-frequency speed regulating motor (7);
the method comprises the following steps:
step one, setting a parallel operation target:
the lower limit value PS2 of the pressure of an inlet header (2) and the target value PS3 of the pressure of an outlet header (3) are set in a machine set controller (8) through a first operation panel (17), and the lower limit value PS2 of the pressure of the inlet header (2) and the target value PS3 of the pressure of the outlet header (3) are used as parallel operation targets;
step two, judging whether parallel operation is needed:
setting a priority order of each centrifugal compressor (1) of a plurality of centrifugal compressors connected in parallel in a unit controller (8); comparing a pressure value P00 fed back by an inlet manifold pressure sensor (18) with a lower pressure limit value PS2 of an inlet manifold (2) and comparing a pressure value P01 fed back by an outlet manifold pressure sensor (19) with a pressure target value PS3 of an outlet manifold (3) in a unit controller (8);
when the real-time value of P00 is greater than PS2 and the real-time value of P01 is less than PS3, executing step three, otherwise, not performing parallel operation;
step three, judging the running state of the centrifugal compressor:
according to the rotation speed fed back by the rotation speed sensor, the operation state judgment of each centrifugal compressor (1) is carried out in a machine set controller (8):
when all the rotating speeds are less than or equal to 20r/min, the centrifugal compressor (1) does not operate, and the step five is executed;
when all the rotating speeds are greater than the lowest working condition operating rotating speed, all the centrifugal compressors (1) are operated without parallel operation;
otherwise, a part of the centrifugal compressors (1) are in operation, the centrifugal compressor (1) which is in operation in the plurality of centrifugal compressors connected in parallel is defined as an operating centrifugal compressor (101), and the centrifugal compressor (1) which is not in operation is defined as a centrifugal compressor (102) to be connected in parallel, and then the fourth step is executed;
step four, starting the centrifugal compressor to be connected in parallel:
selecting one centrifugal compressor (102) to be connected in parallel from the centrifugal compressors (102) to be connected in parallel according to the priority sequence of the step two;
step 41, controlling the operation of the centrifugal compressor (101) by the unit controller (8) to operate by taking the rotating speed fed back by the rotating speed sensor in the step three as a set rotating speed, and operating the centrifugal compressor (101) safely without participating in load regulation, namely operating the centrifugal compressor (101) to enter a constant rotating speed operation control mode;
step 42, after the centrifugal compressor (101) is operated to enter a constant rotating speed operation control mode, the outlet header pressure sensor (19) collects a pressure value PS1 of the outlet header (3) in real time, and PS1+20kPa is used as a target pressure value of an outlet branch pipe of a single-machine load controller (9) of the centrifugal compressor (102) to be connected in parallel;
43, controlling the centrifugal compressor (102) to be connected in parallel to be normally started by the single-machine load controller (9), and operating at the lowest working condition operation rotating speed after starting;
step 44, controlling the load increase of the centrifugal compressor (102) to be connected in parallel by the single-machine load controller (9) until the pressure value acquired by the gas outlet pressure sensor (11) is equal to the target pressure value of the gas outlet branch pipe according to the target pressure value of the gas outlet branch pipe of the single-machine load controller (9) of the centrifugal compressor (102) to be connected in parallel in the step 42, and then performing constant-pressure PID (proportion integration differentiation) adjustment on the centrifugal compressor (102) to be connected in parallel;
step five, starting the centrifugal compressor:
when no centrifugal compressor (1) is in operation, selecting at least one centrifugal compressor (1) from the plurality of centrifugal compressors (1) connected in parallel according to the priority sequence of the step two, controlling normal start through the corresponding single-machine load controller (1), taking the started centrifugal compressor (1) as the operating centrifugal compressor (101), and then returning to the step four;
step six, pre-parallel operation:
taking the pressure value PS2-20kPa of the inlet manifold (2) collected in the first step as a target pressure value of an inlet branch pipe, taking the pressure value PS3+20kPa of the outlet manifold (3) collected in the first step as a target pressure value of an outlet branch pipe, respectively transmitting the pressure value PS3+20kPa of the outlet manifold (3) collected in the first step to a single-machine load controller (9) corresponding to the centrifugal compressor (101) to be operated and a single-machine load controller (9) corresponding to the centrifugal compressor (102) to be connected in parallel through a unit controller (8), respectively controlling the load loading of the centrifugal compressor (101) to be operated and the centrifugal compressor (1) to be connected in parallel until the pressure value of the inlet branch pipe of the centrifugal compressor (101) to be operated and the centrifugal compressor (102) to be connected in parallel is equal to the target pressure value of the inlet branch pipe;
step seven, adjusting the loading state:
after the pre-parallel operation is finished, judging the loading states of the operating centrifugal compressor (101) and the centrifugal compressor (102) to be connected in parallel: when the real-time value acquired by the air outlet header pressure sensor (19) reaches PS 3-PS 3+20kPa or when the real-time value acquired by the air inlet header pressure sensor (18) reaches low limit PS 2-PS 2-20kPa, the loading is finished, otherwise, the single-machine load controller (8) respectively controls the centrifugal compressor (101) to be operated and the centrifugal compressor (102) to be connected in parallel to continue loading until the conditions are met, and the loading is finished;
step eight, closing the anti-surge regulating valve:
for an operating centrifugal compressor (101) and a centrifugal compressor (102) to be connected in parallel, the valve opening degree of an anti-surge regulating valve (25) is acquired in real time through a valve position feedback sensor (13), the valve opening degree of the anti-surge regulating valve (25) is judged, when the valve opening degree is larger than 0 +/-0.5%, the anti-surge regulating valve (25) has an opening degree, and under the premise of keeping the pressure of an air outlet header (3) stable, load regulation is carried out on the operating centrifugal compressor (101) and/or the centrifugal compressor (102) to be connected in parallel under the control of a unit controller (8) until the anti-surge regulating valve (25) of the operating centrifugal compressor (101) and the centrifugal compressor (102) to be connected in parallel is completely closed through a valve position actuator (15), and automatic parallel operation is completed.
2. Method for the automatic parallel operation of multiple parallel centrifugal compressor groups according to claim 1, characterized in that said centrifugal compressor (1) is a single-shaft single-stage centrifugal compressor.
3. The automatic parallel operation method of multi-parallel centrifugal compressor units according to claim 1, characterized in that a speed change gear box is arranged between the variable frequency speed regulating motor (7) and the centrifugal compressor (1).
4. The automatic parallel operation method of multiple parallel centrifugal compressor units according to claim 1, characterized in that the unit controller (8) is further connected with a remote controller (20), and the remote controller (20) is connected with a second operation panel (21).
5. The method for automatic parallel operation of multiple parallel centrifugal compressor units according to claim 1, wherein the minimum operating speed is 3000-6000 r/min.
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