CN110529417B - Automatic online cutting machine operation method of multi-machine parallel centrifugal compressor unit - Google Patents
Automatic online cutting machine operation method of multi-machine parallel centrifugal compressor unit Download PDFInfo
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- CN110529417B CN110529417B CN201910752609.7A CN201910752609A CN110529417B CN 110529417 B CN110529417 B CN 110529417B CN 201910752609 A CN201910752609 A CN 201910752609A CN 110529417 B CN110529417 B CN 110529417B
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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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- 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
- F04D27/005—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by changing flow path between different stages or between a plurality of compressors; Load distribution between compressors
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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
- F04D27/0207—Surge control by bleeding, bypassing or recycling fluids
Abstract
The invention provides an automatic online cutting machine operation method of a multi-machine parallel centrifugal compressor unit, which comprises the following steps: step one, judging the running state of the centrifugal compressor: step two, starting the standby centrifugal compressor: step three, the standby centrifugal compressor is loaded: step four, the centrifugal compressor to be switched enters a constant rotating speed operation control mode: step five, cutting off the centrifugal compressor to be switched: and step six, closing the anti-surge regulating valve. The invention realizes the on-line and full automation of the main and standby machine cutting process. By applying the invention, the cutting process does not need human intervention, the time consumption is short, the pressure fluctuation caused to the process device is small, and the invention is safer and more reliable. Meanwhile, the maintenance time of each single machine is conveniently and reasonably arranged in a factory.
Description
Technical Field
The invention belongs to the field of turbo compressors, relates to a multi-machine parallel centrifugal compressor unit, and particularly relates to an automatic online cutting machine operation method of the multi-machine 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.
One advantage of multiple units operating in parallel is that a reserve unit can be provided to ensure long-term operation of the process plant without the need to stop the process plant for shutdown maintenance. However, the switching between the standby machine and the main machine in the current process industry is generally performed by manually stopping the main machine, and then starting the standby machine again to achieve the target of the set process parameters. Therefore, online undisturbed switching cannot be realized by the operation, and the switching time of the main machine and the standby machine is long.
In the prior art, no disturbance-free switching method for the main machine and the standby machine in online multi-machine parallel operation exists, and full-automatic control in the switching process cannot be realized, so that the conventional machine set is completed by manual operation of a compressor operator. The requirement on the skill level of operators is high, the operation parallel operation time is long, and the unit operation fault caused by human factors is easy to occur; in the current parallel operation process of manual operation, a scheme of stopping a main machine and starting a standby machine is generally adopted, so that the condition of reducing the whole load of an existing operation unit can be caused, the pressure, the flow and other large-scale fluctuation of the whole process device can be caused, and negative effects can be generated on production;
disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an automatic online cutting machine operation method of a multi-machine parallel centrifugal compressor unit, and solves the problems that the main and standby machines of the compressor unit in the prior art cannot be switched online in real time when the multi-machine parallel operation is carried out, manual operation is needed, and automatic control cannot be realized.
In order to solve the technical problems, the invention adopts the following technical scheme:
an automatic online cutting machine operation method of a multi-machine parallel centrifugal compressor unit is disclosed, wherein the multi-machine parallel centrifugal compressor unit comprises a plurality of centrifugal compressors connected in parallel, an air inlet manifold and an air outlet manifold, 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 return branch pipe 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 input 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, 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 is operated, and no cutting machine operation is carried out;
when all the rotating speeds are greater than the lowest working condition operating rotating speed, all the centrifugal compressors are in operation, and the unit controller feeds back the machine unit without cutting and does not perform the operation of cutting;
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 the centrifugal compressor to be switched, and the centrifugal compressor which is not in operation is defined as the standby centrifugal compressor, and then the second step is executed;
step two, starting the standby centrifugal compressor:
setting the priority order of each centrifugal compressor in a plurality of centrifugal compressors connected in parallel in a unit controller, selecting one centrifugal compressor to be switched from the centrifugal compressors to be switched according to the priority order, and selecting one standby centrifugal compressor from the standby centrifugal compressors; the single-machine load controller 9 controls the standby centrifugal compressor to start, and after starting, the standby centrifugal compressor runs at the lowest working condition running speed;
step three, the standby centrifugal compressor is loaded:
the pressure sensor of the outlet header collects the pressure of the outlet header in real time, and a pressure value P01 fed back by the pressure sensor of the outlet header is used as a pressure target value PS3 of the outlet branch pipe; the unit controller 8 transmits the pressure target value PS3 to the single machine load controller of the standby centrifugal compressor, and the single machine load controller controls the load increase of the standby centrifugal compressor until the pressure value of the air outlet branch pipe of the standby centrifugal compressor is PS3 ℃
PS3+20kPa range;
step four, the centrifugal compressor to be switched enters a constant rotating speed operation control mode:
controlling the centrifugal compressor to be switched to operate at a rotating speed fed back by the rotating speed sensor in the step one as a set rotating speed through a unit controller, wherein the centrifugal compressor to be switched is operated safely without participating in load regulation, namely, the centrifugal compressor to be switched enters a fixed rotating speed operation control mode;
step five, cutting off the centrifugal compressor to be switched:
the method comprises the steps that linear load reduction control is carried out on a centrifugal compressor to be switched through a single-machine load controller, the running rotating speed of the centrifugal compressor to be switched is continuously and slowly reduced, meanwhile, the single-machine load controller carries out constant-pressure PID (proportion integration differentiation) adjustment on a standby centrifugal compressor by taking PS3 as a target value, so that the pressure value of an air outlet branch pipe of the standby centrifugal compressor is always kept in the range of PS 3-PS 3+20kPa until the centrifugal compressor to be switched is cut off from a parallel operation state;
the judgment condition for cutting off the centrifugal compressor to be switched from the parallel operation state is that the pressure value of the air outlet branch pipe of the centrifugal compressor to be switched fed back by the air outlet pressure sensor is not more than PS3-20 kPa;
after the centrifugal compressor to be switched is cut off from the parallel operation state, the centrifugal compressor to be switched is controlled to normally stop through the single-machine load controller 9;
step six, closing the anti-surge regulating valve:
and for all the centrifugal compressors in the multi-unit parallel centrifugal compressor set in the running state, acquiring the valve opening of an anti-surge regulating valve through a valve position feedback sensor, judging the valve opening of the anti-surge regulating valve, and when the valve opening is more than 0 +/-0.5%, the anti-surge regulating valve has an opening, and under the premise of keeping the pressure of an air outlet header stable, carrying out load regulation on the centrifugal compressors in the running state under the control of a unit controller until the anti-surge regulating valves of all the centrifugal compressors in the running state are completely closed through a valve position actuator, thereby completing the operation of an online cutter cutting machine.
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 invention realizes the on-line and full automation of the main and standby machine cutting process. By applying the invention, the cutting process does not need human intervention, the time consumption is short, the pressure fluctuation caused to the process device is small, and the invention is safer and more reliable. Meanwhile, the maintenance time of each single machine is conveniently and reasonably arranged in a factory.
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-centrifugal compressor to be switched, 102-spare centrifugal compressor, 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 automatic online cutting machine operation method, which solve the problem of online switching control of a main machine and a standby machine in 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 on the basis of fully knowing the parallel operation process characteristics of the unit, the invention can be discussed with field operators of equipment parties, design houses, project parties and the like, and combines the practices on typical process schemes. The method has good effect, and solves the problem that the process system is fluctuated because the process of switching the main machine and the standby machine cannot be implemented on line. 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 and 'automatic parallel operation' technology to lead the intellectualization level of the industrial process compressor unit equipment to 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 online cutting machine 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 to each other through a return branch pipe 6 connected in parallel to the centrifugal compressor 1; 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 input 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, judging the running state of the centrifugal compressor:
on the basis of the rotational speed fed back by the rotational speed sensor 14, an operating state determination is made in the unit controller 8 for each centrifugal compressor 1:
when all the rotating speeds are less than or equal to 20r/min, the centrifugal compressor 1 does not operate, and the cutting machine operation is not carried out;
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 machine unit without cutting and does not perform the operation of cutting;
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 the centrifugal compressor 101 to be switched, and the centrifugal compressor which is not in operation is the standby centrifugal compressor 102, and then the step two is executed;
step two, starting the standby centrifugal compressor:
setting a priority order of each centrifugal compressor 1 in the plurality of centrifugal compressors 1 connected in parallel in the unit controller 8, selecting one centrifugal compressor 101 to be switched from the centrifugal compressors 101 to be switched according to the priority order, and selecting one standby centrifugal compressor 102 from the standby centrifugal compressors 102; the single-machine load controller 9 controls the standby centrifugal compressor 102 to start, and after starting, the standby centrifugal compressor operates at the lowest working condition operation rotating speed;
step three, the standby centrifugal compressor is loaded:
the outlet header pressure sensor 19 collects the pressure of the outlet header 3 in real time, and the pressure value P01 fed back by the outlet header pressure sensor 19 is used as the pressure target value PS3 of the outlet branch pipe 5; the unit controller 8 transmits the pressure target value PS3 to the single unit load controller 9 of the standby centrifugal compressor 102, and the single unit load controller 9 controls the load increase of the standby centrifugal compressor 102 until the pressure value of the air outlet branch pipe 5 of the standby centrifugal compressor 102 is in the range of PS 3-PS 3+20 kPa;
step four, the centrifugal compressor to be switched enters a constant rotating speed operation control mode:
controlling the centrifugal compressor 101 to be switched to operate at a rotating speed fed back by the rotating speed sensor in the step one as a set rotating speed through the unit controller 8, wherein the centrifugal compressor 101 to be switched is operated safely without participating in load regulation, namely, the centrifugal compressor 101 to be switched enters a constant rotating speed operation control mode;
step five, cutting off the centrifugal compressor to be switched:
the method comprises the steps that linear load reduction control is carried out on a centrifugal compressor 101 to be switched through a single-machine load controller 9, the running rotating speed of the centrifugal compressor 101 to be switched is continuously and slowly reduced, meanwhile, the single-machine load controller 9 carries out constant-pressure PID (proportion integration differentiation) regulation on a standby centrifugal compressor 102 by taking PS3 as a target value, so that the pressure value of an air outlet branch pipe 5 of the standby centrifugal compressor 102 is always kept in the range of PS 3-PS 3+20kPa until the centrifugal compressor 101 to be switched is cut off from a parallel operation state;
the judgment condition for cutting off the centrifugal compressor 101 to be switched from the parallel operation state is that the pressure value of the air outlet branch pipe 5 of the centrifugal compressor 101 to be switched, which is fed back by the air outlet pressure sensor 11, is not more than
PS3-20kPa；
After the centrifugal compressor 101 to be switched is cut off from the parallel operation state, the centrifugal compressor 101 to be switched is controlled to normally stop through the single-machine load controller 9;
step six, closing the anti-surge regulating valve:
for all the centrifugal compressors 1 in the multi-unit parallel centrifugal compressor set in the running state, the valve opening degree of the anti-surge regulating valve 25 is collected 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 an opening degree, under the premise of keeping the pressure of the air outlet header 3 stable, the load regulation is carried out on the centrifugal compressors 1 in the running state under the control of the unit controller 8 until all the anti-surge regulating valves 25 of the centrifugal compressors 1 in the running state are completely closed through the valve position actuator 15, and the online cutting machine 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 with centrifugal compressors in parallel 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 two centrifugal compressors to be switched and one standby centrifugal compressor as an example, the automatic online cutting machine operation is carried out according to the operation method in the embodiment 1. Wherein: in step three, the target pressure PS3 of the outlet branch pipe 5 is 10.3 Mpa. In the fourth step, the rotating speed of the centrifugal compressor to be switched in the constant rotating speed operation control mode is 4315
r/min. The lowest working condition running speed of the centrifugal compressor is 3120 r/min.
By the automatic online cutting machine operation method provided by the invention, all processes are unattended. The practice of an automatic control program is combined, so that when two compressors run in parallel, one of the two compressors is switched to a running host machine in an online undisturbed manner, and a client can conveniently and programmatically implement the inspection and maintenance work of the compressor unit. Meanwhile, the switching is free of human intervention, so that the workload of human operation is reduced, the efficiency is improved, and the value is created for customers.
Claims (5)
1. An automatic online cutting operation method for a multi-machine parallel centrifugal compressor unit comprises the steps that the multi-machine 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 input 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, judging the running state of the centrifugal compressor:
according to the rotation speed fed back by the rotation speed sensor (14), the operation state of each centrifugal compressor (1) is judged in the 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 cutting machine operation is not carried out;
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 machine unit without cutting and does not perform the operation of cutting;
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 the centrifugal compressor (101) to be switched, and the centrifugal compressor which is not in operation is defined as the standby centrifugal compressor (102), and then the second step is executed;
step two, starting the standby centrifugal compressor:
setting a priority order of each centrifugal compressor (1) in a plurality of centrifugal compressors (1) connected in parallel in a unit controller (8), selecting one centrifugal compressor (101) to be switched from among centrifugal compressors (101) to be switched according to the priority order, and selecting one standby centrifugal compressor (102) from among standby centrifugal compressors (102); the stand-alone load controller (9) controls the standby centrifugal compressor (102) to start, and the standby centrifugal compressor runs at the lowest working condition running speed after being started;
step three, the standby centrifugal compressor is loaded:
the pressure of the outlet header (3) is collected by the outlet header pressure sensor (19) in real time, and a pressure value P01 fed back by the outlet header pressure sensor (19) is used as a pressure target value PS3 of the outlet branch pipe (5); the unit controller (8) transmits the pressure target value PS3 to a single unit load controller (9) of the standby centrifugal compressor (102), and the single unit load controller (9) controls the load increase of the standby centrifugal compressor (102) until the pressure value of an air outlet branch pipe (5) of the standby centrifugal compressor (102) is in the range of PS 3-PS 3+20 kPa;
step four, the centrifugal compressor to be switched enters a constant rotating speed operation control mode:
controlling the centrifugal compressor (101) to be switched to operate by using the rotating speed fed back by the rotating speed sensor in the step one as a set rotating speed through a unit controller (8), wherein the centrifugal compressor (101) to be switched is operated safely without participating in load regulation, namely, the centrifugal compressor (101) to be switched enters a constant rotating speed operation control mode;
step five, cutting off the centrifugal compressor to be switched:
the method comprises the steps that linear load reduction control is carried out on a centrifugal compressor (101) to be switched through a single-machine load controller (9), the running rotating speed of the centrifugal compressor (101) to be switched is continuously and slowly reduced, meanwhile, the single-machine load controller (9) carries out constant-pressure PID adjustment with PS3 as a target value on a standby centrifugal compressor (102), so that the pressure value of an air outlet branch pipe (5) of the standby centrifugal compressor (102) is always kept in the range of PS 3-PS 3+20kPa until the centrifugal compressor (101) to be switched is cut off from a parallel operation state;
the judgment condition for cutting off the centrifugal compressor (101) to be switched from the parallel operation state is that the pressure value of the air outlet branch pipe (5) of the centrifugal compressor (101) to be switched, which is fed back by the air outlet pressure sensor (11), is not more than PS3-20 kPa;
after the centrifugal compressor (101) to be switched is cut off from the parallel operation state, the centrifugal compressor (101) to be switched is controlled to normally stop through the single-machine load controller (9);
step six, closing the anti-surge regulating valve:
for all the centrifugal compressors (1) in the multi-machine parallel centrifugal compressor set in the running state, the valve opening degree of an anti-surge regulating valve (25) is collected 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, the centrifugal compressors (1) in the running state are subjected to load regulation under the control of a machine set controller (8) until the anti-surge regulating valves (25) of all the centrifugal compressors (1) in the running state are completely closed through a valve position actuator (15), so that the on-line cutting operation is completed.
2. The automatic on-line cutting machine operation method of multi-parallel centrifugal compressor set according to claim 1, characterized in that the centrifugal compressor (1) adopts a single-shaft single-stage centrifugal compressor.
3. The automatic on-line cutting machine operation method of the multi-parallel centrifugal compressor unit 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 on-line cutting machine operation method of the multi-parallel centrifugal compressor unit 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 operating an automatic on-line cutting machine of a multi-parallel centrifugal compressor unit according to claim 1, wherein the lowest working condition operation rotating speed is 3000-6000 r/min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910752609.7A CN110529417B (en) | 2019-08-15 | 2019-08-15 | Automatic online cutting machine operation method of multi-machine parallel centrifugal compressor unit |
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| CN201910752609.7A CN110529417B (en) | 2019-08-15 | 2019-08-15 | Automatic online cutting machine operation method of multi-machine parallel centrifugal compressor unit |
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| CN110529417A CN110529417A (en) | 2019-12-03 |
| CN110529417B true CN110529417B (en) | 2020-07-14 |
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