CN118070456B - Transient evaluation method for unexpected shutdown of large double-suction pump and water hammer protection device - Google Patents
Transient evaluation method for unexpected shutdown of large double-suction pump and water hammer protection device Download PDFInfo
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- CN118070456B CN118070456B CN202410472799.8A CN202410472799A CN118070456B CN 118070456 B CN118070456 B CN 118070456B CN 202410472799 A CN202410472799 A CN 202410472799A CN 118070456 B CN118070456 B CN 118070456B
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- 238000011156 evaluation Methods 0.000 title claims abstract description 7
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- G—PHYSICS
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- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
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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
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/02—Stopping of pumps, or operating valves, on occurrence of unwanted conditions
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Abstract
The invention relates to an unexpected shutdown transient evaluation method of a large double suction pump and a water hammer protection device, wherein the method comprises the following steps: s1, constructing a three-dimensional model of a large double suction pump, extracting a water body model from the three-dimensional model as a calculation domain, and carrying out grid division; s2, setting boundary conditions of a flow field and physical parameters of a fluid domain and a rigid domain; s3, predicting the rotating speed of the impeller in the accidental shutdown process of the large double suction pump through the mutual coupling calculation of the fluid domain and the rigid domain, and obtaining the change rule of the rotating speed, the flow and the torque; s4, evaluating the maximum hazard time according to the change rules of the rotating speed, the flow and the torque in the accidental shutdown process of the large double suction pump. The invention can effectively and accurately obtain the change rule of the rotating speed, the flow and the torque and the maximum hazard time in the accidental shutdown process of the large double suction pump, and combines the maximum hazard time to provide the water hammer protection device, thereby effectively reducing the influence of the accidental shutdown on the pump set and prolonging the service life of equipment.
Description
Technical Field
The invention belongs to the technical field of safe operation of fluid machinery, and particularly relates to an accidental shutdown transient evaluation method of a large double suction pump and a water hammer protection device.
Background
As a form of centrifugal pump, the large double suction pump has the advantages of high lift, large horizontal flow, high efficiency and the like, and is widely applied to the fields of municipal water supply, petrochemical industry, thermal power generation water circulation and the like, and the running state of the large double suction pump directly influences the normal operation of the fields. In the unexpected shutdown process of the double suction pump, because the impeller is not controlled by the motor and is only under the action of water power, water hammer accidents are easily caused in the pipeline, and the pump has overhigh reverse rotating speed, so that the whole system including strong pressure pulsation and vibration of a unit and a pipeline can be caused, and various overcurrent components can be damaged. Because the operation conditions of the double suction pump are different, the time for flying when the double suction pump is stopped accidentally is also different.
In the prior art, one-dimensional simulation calculation is adopted for unexpected shutdown of a large double suction pump, the one-dimensional simulation calculation speed is high, and the calculation reliability is lower than that of three-dimensional simulation calculation. The protection method for the accidental shutdown of the large double-suction pump mostly adopts a check valve or a butterfly valve which is closed in stages at the outlet of the pump, but the common check valve is not controlled by people, the butterfly valve which is closed in stages is mostly closed in two stages of quick closing and slow closing, and the influence caused by the accidental shutdown of the pump under different operation conditions can not be effectively controlled.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides an accidental shutdown transient evaluation method of a large double suction pump and a water hammer protection device. In order to achieve the above object, the present invention is realized by the following technical scheme.
An unexpected shutdown transient evaluation method for a large double suction pump, comprising:
S1, constructing a three-dimensional model of a large double suction pump, extracting a water body model from the three-dimensional model as a calculation domain, and carrying out grid division;
s2, setting boundary conditions of a flow field and physical parameters of a fluid domain and a rigid domain;
S3, predicting the rotating speed of the impeller in the accidental shutdown process of the large double suction pump through the mutual coupling calculation of the fluid domain and the rigid domain, and obtaining the change rule of the rotating speed, the flow and the torque;
S4, evaluating the maximum hazard time according to the change rules of the rotating speed, the flow and the torque in the accidental shutdown process of the large double suction pump.
Further, the water body model in S1 includes: the device comprises a water inlet section, a water suction chamber, an impeller, a volute and a water outlet section; the grid division adopts a structured grid division technology so as to improve the calculation accuracy and the calculation efficiency.
Further, boundary conditions in S2 include, but are not limited to, computational domain inlets, outlets, walls, and interfaces;
the fluid domain comprises a water inlet section, a water suction chamber, a volute and a water outlet section, and the physical parameters of the fluid domain comprise material properties and temperature; the rigid domain is the impeller, and its physical parameters are mass, moment of inertia, motion constraint, gravity and resistance moment.
Further, the step S3 specifically includes:
s31, calculating the data of a velocity field and a pressure field of a fluid domain at the current moment by solving a Navier-Stokes equation, a continuous equation and a momentum equation, and transmitting the data to a rigid domain;
S32, according to the stress condition of the impeller in the rigid domain, solving the angular acceleration of the impeller based on an impeller rotation balance equation, further solving the angular velocities at the current moment and the next moment, and transmitting data to the fluid domain so as to update the motion boundary condition of the fluid domain;
S33, judging whether the moment stressed by the impeller oscillates around 0, and if the moment stressed by the impeller oscillates around 0, ending calculation; or, if the moment applied to the impeller does not oscillate around 0, the process returns to S31.
Further, the impeller rotation balance equation in S32 specifically includes:
wherein: N.m is the resultant moment acting on the impeller; n.m is the system load moment; The rotational inertia of the multistage pump impeller is kg.m 2; the rotation angular velocity of the impeller is rad/s.
After the double suction pump is stopped accidentally, the load moment is zero, and the differential dispersion can be obtained by carrying out differential dispersion on the impeller rotation balance equation:
Wherein: the rotation angular velocity of the impeller at the moment i+1 is rad/s; the moment is the combined moment acting on the impeller at the moment i, N.m; To calculate the time step, s.
Further, the maximum hazard time in the step S4 is the time required by the double suction pump from unexpected power-off to flying working condition.
Unexpected water hammer protector that stops of large-scale double suction pump specifically includes: the hydraulic turbine is characterized by comprising a check valve, a bypass pipe, a hydraulic turbine, a regulating valve and a monitoring control system.
Further, the check valve is arranged at the outlet of the large double-suction pump, the valve opening is controlled by a motor, and the adjusting time under the unexpected shutdown working condition is less than the maximum hazard time, so that the protection effect is achieved; the bypass pipe is connected with the outlet of the check valve and the inlet of the large double-suction pump; the hydraulic turbine is arranged in the bypass pipe, recovers energy of liquid flowing through the bypass pipe, converts the energy into electric energy and stores the electric energy in the storage battery for supplying power to the motor and the monitoring control system; the regulating valve is arranged on the bypass pipe in a normally closed state, and the valve is opened if the storage battery is deficient in power, so that the hydraulic turbine works to charge the storage battery, and the valve is opened if the storage battery is stopped accidentally, so that the pressure born by the check valve is reduced; the monitoring control system is used for monitoring the running state of the large double suction pump and the electric quantity of the storage battery and controlling the opening of the check valve and the opening of the regulating valve according to the monitoring result.
Compared with the prior art, the invention has the following advantages or beneficial effects: according to the method for calculating the mutual coupling of the fluid domain and the rigid domain, disclosed by the invention, the calculation is carried out in the unexpected shutdown process of the large double-suction pump, the change rule of the rotating speed, the flow and the torque in the unexpected shutdown process is more accurately obtained, the maximum hazard time is estimated, the water hammer protection device is provided in combination with the maximum hazard time, the influence of the water hammer on equipment is effectively reduced, the water in the pipeline is ensured not to flow back to the pump group, the reverse rotation of the pump group is prevented from damaging the equipment, and the construction and maintenance cost of the equipment is reduced.
Drawings
In order to more clearly describe the technical scheme in the embodiment of the invention, the following description of the embodiment will be used as required
It is obvious that the drawings in the following description are only some embodiments of the present invention and that other drawings may be obtained from them by those skilled in the art without inventive work.
FIG. 1 is a schematic flow chart of a method for evaluating unexpected shutdown transient state of a large double suction pump provided by the invention;
FIG. 2 is a flow chart of a fluid domain and rigid domain mutual coupling calculation provided by the present invention;
fig. 3 is a schematic structural view of a water hammer protection device for unexpected shutdown of a large double suction pump.
Detailed Description
The following describes the detailed implementation of the embodiments of the present invention with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
The embodiment of the invention provides a method for evaluating unexpected shutdown transient state of a large double suction pump, which comprises the following steps:
S1, constructing a three-dimensional model of a large double suction pump, extracting a water body model from the three-dimensional model as a calculation domain, and carrying out grid division;
s2, setting boundary conditions of a flow field and physical parameters of a fluid domain and a rigid domain;
S3, predicting the rotating speed of the impeller in the accidental shutdown process of the large double suction pump through the mutual coupling calculation of the fluid domain and the rigid domain, and obtaining the change rule of the rotating speed, the flow and the torque;
S4, evaluating the maximum hazard time according to the change rules of the rotating speed, the flow and the torque in the accidental shutdown process of the large double suction pump.
Optionally, the water body model in S1 includes: the device comprises a water inlet section, a water suction chamber, an impeller, a volute and a water outlet section; the grid division adopts a structured grid division technology so as to improve the calculation accuracy and the calculation efficiency.
Optionally, boundary conditions in S2 include, but are not limited to, computational domain inlets, outlets, walls, and interfaces;
the fluid domain comprises a water inlet section, a water suction chamber, a volute and a water outlet section, and the physical parameters of the fluid domain comprise material properties and temperature; the rigid domain is the impeller, and its physical parameters are mass, moment of inertia, motion constraint, gravity and resistance moment.
Optionally, as shown in fig. 2, S3 is specifically:
s31, calculating the data of a velocity field and a pressure field of a fluid domain at the current moment by solving a Navier-Stokes equation, a continuous equation and a momentum equation, and transmitting the data to a rigid domain;
S32, according to the stress condition of the impeller in the rigid domain, solving the angular acceleration of the impeller based on an impeller rotation balance equation, further solving the angular velocities at the current moment and the next moment, and transmitting data to the fluid domain so as to update the motion boundary condition of the fluid domain;
S33, judging whether the moment stressed by the impeller oscillates around 0, and if the moment stressed by the impeller oscillates around 0, ending calculation; or, if the moment applied to the impeller does not oscillate around 0, the process returns to S31.
Optionally, the impeller rotation balance equation in S32 specifically includes:
wherein: N.m is the resultant moment acting on the impeller; n.m is the system load moment; The rotational inertia of the multistage pump impeller is kg.m 2; the rotation angular velocity of the impeller is rad/s.
After the double suction pump is stopped accidentally, the load moment is zero, and the differential dispersion can be obtained by carrying out differential dispersion on the impeller rotation balance equation:
Wherein: the rotation angular velocity of the impeller at the moment i+1 is rad/s; the moment is the combined moment acting on the impeller at the moment i, N.m; To calculate the time step, s.
Optionally, the maximum hazard time in S4 is the time required for the double suction pump from unexpected power failure to the working condition of flying.
The embodiment of the invention also provides a water hammer protection device for unexpected shutdown of the large double suction pump, which specifically comprises the following components: a check valve 1, a bypass pipe 2, a hydraulic turbine 3, a regulating valve 4 and a monitoring control system 5.
Optionally, the check valve 1 is arranged at the outlet of the large double suction pump, the valve opening is controlled by a motor, and the adjusting time under the unexpected shutdown working condition is less than the maximum hazard time, thereby playing a role in protection; the bypass pipe 2 is connected with a check valve outlet and a large double-suction pump inlet; the hydraulic pump 3 is arranged in the bypass pipe horizontally, recovers energy of liquid flowing through the bypass pipe, converts the energy into electric energy and stores the electric energy in the storage battery 6 for supplying power to the motor and the monitoring control system 5; the regulating valve 4 is arranged on the bypass pipe 2 in a normally closed state, and opens the valve if the storage battery 6 is deficient in electricity, so that the hydraulic turbine 3 works to charge the storage battery, and also opens the valve if unexpected shutdown occurs, so that the pressure born by the check valve 1 is reduced; the monitoring control system 5 is used for monitoring the running state of the large double suction pump and the electric quantity of the storage battery 6, and controlling the opening of the check valve 1 and the opening of the regulating valve 4 according to the monitoring result.
In the embodiment of the present invention, the units described as separate components may or may not be physically separated, and components shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced with equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (3)
1. An unexpected shutdown transient evaluation method for a large double suction pump is characterized by comprising the following steps:
S1, constructing a three-dimensional model of a large double suction pump, extracting a water body model from the three-dimensional model as a calculation domain, and carrying out grid division;
s2, setting boundary conditions of a flow field and physical parameters of a fluid domain and a rigid domain;
S3, predicting the rotating speed of the impeller in the accidental shutdown process of the large double suction pump through the mutual coupling calculation of the fluid domain and the rigid domain, and obtaining the change rule of the rotating speed, the flow and the torque;
S4, evaluating the maximum hazard time according to the change rules of the rotating speed, the flow and the torque in the accidental shutdown process of the large double suction pump;
Wherein, the water body model in S1 includes: the device comprises a water inlet section, a water suction chamber, an impeller, a volute and a water outlet section; the grid division adopts a structured grid division technology so as to improve the calculation precision and the calculation efficiency;
Boundary conditions in S2 include, but are not limited to, computational domain inlets, outlets, walls, and interfaces; the fluid domain comprises a water inlet section, a water suction chamber, a volute and a water outlet section, and the physical parameters of the fluid domain comprise material properties and temperature; the rigid domain is an impeller, and the physical parameters of the rigid domain are mass, moment of inertia, motion constraint, gravity and resistance moment;
S3 specifically comprises the following steps:
s31, calculating the data of a velocity field and a pressure field of a fluid domain at the current moment by solving a Navier-Stokes equation, a continuous equation and a momentum equation, and transmitting the data to a rigid domain;
S32, according to the stress condition of the impeller in the rigid domain, solving the angular acceleration of the impeller based on an impeller rotation balance equation, further solving the angular velocities at the current moment and the next moment, and transmitting data to the fluid domain so as to update the motion boundary condition of the fluid domain;
s33, judging whether the moment stressed by the impeller oscillates around 0, and if the moment stressed by the impeller oscillates around 0, ending calculation; or if the moment born by the impeller does not oscillate around 0, returning to S31;
the impeller rotation balance equation in S32 is specifically:
；
wherein: N.m is the resultant moment acting on the impeller; n.m is the system load moment; The rotational inertia of the multistage pump impeller is kg.m 2; rad/s is the rotation angular velocity of the impeller;
After the double suction pump is stopped accidentally, the load moment is zero, and the differential dispersion can be obtained by carrying out differential dispersion on the impeller rotation balance equation:
；
Wherein: the rotation angular velocity of the impeller at the moment i+1 is rad/s; the moment is the combined moment acting on the impeller at the moment i, N.m; to calculate a time step, s;
the maximum hazard time in S4 is the time required for the double suction pump from unexpected power failure to the runaway condition.
2. The water hammer protection device based on the method for evaluating unexpected shutdown transient state of a large double suction pump as claimed in claim 1, comprising: the hydraulic turbine is characterized by comprising a check valve, a bypass pipe, a hydraulic turbine, a regulating valve and a monitoring control system.
3. The water hammer protection device for the method for evaluating the unexpected shutdown transient state of the large double suction pump according to claim 2, wherein the check valve is arranged at the outlet of the large double suction pump, the valve opening is controlled by a motor, and the time for adjusting under the unexpected shutdown condition is less than the maximum hazard time, thereby playing a role in protection; the bypass pipe is connected with the outlet of the check valve and the inlet of the large double-suction pump; the hydraulic turbine is arranged in the bypass pipe, recovers energy of liquid flowing through the bypass pipe, converts the energy into electric energy and stores the electric energy in the storage battery for supplying power to the motor and the monitoring control system; the regulating valve is arranged on the bypass pipe in a normally closed state, and the valve is opened if the storage battery is deficient in power, so that the hydraulic turbine works to charge the storage battery, and the valve is opened if the storage battery is stopped accidentally, so that the pressure born by the check valve is reduced; the monitoring control system is used for monitoring the running state of the large double suction pump and the electric quantity of the storage battery and controlling the opening of the check valve and the opening of the regulating valve according to the monitoring result.
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| US6250887B1 (en) * | 1996-07-19 | 2001-06-26 | Hitachi, Ltd. | Reversible pump-turbine system |
| CN112196783B (en) * | 2020-10-15 | 2022-05-24 | 云南大红山管道有限公司 | Automatic control starting method for pump set of long-distance large-pipe-diameter water conveying and transferring pump station |
| CN114912213A (en) * | 2022-03-31 | 2022-08-16 | 江苏大学 | CFD-6DOF strong coupling numerical calculation method for transient self-flow process of vane pump |
| CN114662425B (en) * | 2022-05-25 | 2022-09-20 | 浙江远算科技有限公司 | Water turbine start-stop working condition flow field simulation prediction method and system |
| CN116092709A (en) * | 2023-02-01 | 2023-05-09 | 岭东核电有限公司 | Water hammer early warning method, device, computer equipment and storage medium |
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| 司乔瑞 等.应急供水多级泵意外停机水力过渡过程瞬态特性.农业工程学.2024,第40卷(第4期),第72-81页. * |
| 太平岗扬水站水锤防护措施;陈志刚 等;山东水利;20060925(第9期);40 * |
| 应急供水多级泵意外停机水力过渡过程瞬态特性;司乔瑞 等;农业工程学;20240229;第40卷(第4期);第72-81页 * |
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