CN117905711A - Multi-shaft centrifugal compressor and fault diagnosis method for impeller of multi-shaft centrifugal compressor - Google Patents
Multi-shaft centrifugal compressor and fault diagnosis method for impeller of multi-shaft centrifugal compressor Download PDFInfo
- Publication number
- CN117905711A CN117905711A CN202410319129.2A CN202410319129A CN117905711A CN 117905711 A CN117905711 A CN 117905711A CN 202410319129 A CN202410319129 A CN 202410319129A CN 117905711 A CN117905711 A CN 117905711A
- Authority
- CN
- China
- Prior art keywords
- inlet
- stage
- primary
- outlet
- valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000003745 diagnosis Methods 0.000 title claims abstract description 14
- 230000007246 mechanism Effects 0.000 claims description 43
- 238000001816 cooling Methods 0.000 claims description 39
- 238000005192 partition Methods 0.000 claims description 30
- 239000007789 gas Substances 0.000 claims description 24
- 238000009423 ventilation Methods 0.000 claims description 18
- 230000009467 reduction Effects 0.000 claims description 17
- 238000012545 processing Methods 0.000 claims description 14
- 238000000926 separation method Methods 0.000 claims description 13
- 230000008602 contraction Effects 0.000 claims description 9
- 239000001307 helium Substances 0.000 claims description 9
- 229910052734 helium Inorganic materials 0.000 claims description 9
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 8
- 230000006835 compression Effects 0.000 claims description 7
- 238000007906 compression Methods 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 7
- 239000012530 fluid Substances 0.000 claims description 4
- 230000009466 transformation Effects 0.000 claims description 4
- 239000000654 additive Substances 0.000 claims description 3
- 230000000996 additive effect Effects 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 3
- 239000000284 extract Substances 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 2
- 238000004891 communication Methods 0.000 claims 1
- 238000013461 design Methods 0.000 abstract description 2
- 238000005457 optimization Methods 0.000 abstract description 2
- 238000013527 convolutional neural network Methods 0.000 description 6
- 239000011159 matrix material Substances 0.000 description 6
- 239000013589 supplement Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000000605 extraction Methods 0.000 description 3
- 238000011176 pooling Methods 0.000 description 3
- 230000004913 activation Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002087 whitening effect Effects 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000005206 flow analysis Methods 0.000 description 1
- 239000000411 inducer Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000003062 neural network model Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000003584 silencer Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 238000012549 training Methods 0.000 description 1
Classifications
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/582—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a multi-shaft centrifugal compressor and a fault diagnosis method of an impeller of the multi-shaft centrifugal compressor, which belong to the technical field of compressors and comprise a support, a compressor main machine, a motor, an intercooler, an impeller and a gas pipeline system; the motor, the intercooler and the air pipeline system are fixedly arranged on the support, a power source of the compressor main unit is provided by the motor, the air pipeline system is composed of an air inlet pipe group and an air outlet pipe group and is respectively connected with an air inlet and an air outlet of the compressor main unit, and the intercooler is connected with the compressor main unit; the invention combines pneumatic design optimization to ensure that the main machine structure is more reasonable and the running stability of the machine set is ensured.
Description
Technical Field
The invention discloses a centrifugal compressor, belongs to the technical field of compressors, and particularly relates to a multi-shaft centrifugal compressor.
Background
The oil-free variable frequency centrifugal blower and the compressor have important positions in various departments of national economy, can be widely applied to various fields related to petrochemical industry, refrigeration, air separation, metallurgy, coal chemical industry, textile, pharmacy, national defense and national civil engineering, are core equipment in the field, and have irreplaceable functions. Compared with the positive displacement type, the centrifugal type has the advantages of high efficiency, less faults, stable operation and the like. Multi-shaft centrifugal compressors, which are a general class of centrifugal compressors, have been widely used in recent years due to their simple structure and higher efficiency. With the rapid development of modern industry and the continuous application of new technology and new technology, the requirements of certain industries on the process gas compressor are higher and higher, and the special requirements are also higher and higher. Centrifugal compressors generally have ultrahigh rotational speeds and adopt a structure of coaxial direct drive with a high-speed motor, and the rotational speeds of tens of thousands of revolutions per minute or even more than 10 tens of thousands of revolutions per minute often exceed the critical rotational speeds of the centrifugal compressors;
The new technology and the new technology are continuously applied, and the requirements of certain industries on the process gas compressor are higher and higher, and the special requirements are also higher and higher. In the process compressor, the special compressor application of middle air supplement and even multi-section air supplement occurs in the middle, but the air supplement structure and fault detection for the compressor are very necessary because the special air supplement in the prior art can only perform one section of air supplement, the air supplement effect is poor and the efficiency is low, and meanwhile, accidents are caused by faults of the compressor impeller, which are easy to interfere, the disasters caused by the accidents are huge, high economic loss is caused, and the life safety of related personnel is threatened.
Disclosure of Invention
The present invention provides a multi-shaft centrifugal compressor that solves the above-mentioned problems.
In one aspect, a multi-shaft centrifugal compressor comprises a support, a compressor main machine, an impeller, a motor, an intercooler and a gas pipeline system; the impeller is sleeved on the driving rotor of the compressor main machine, and a detection system is connected outside the compressor main machine and used for carrying out safety detection on the impeller after working;
The air inlet pipe group and the air outlet pipe group are respectively connected with an air inlet and an air outlet of the compressor main unit, and the intercooler is connected with the compressor main unit.
Preferably, the compressor main unit is composed of a compression gear box, a first cooling assembly, a second cooling assembly and a third cooling assembly; the first cooling assembly, the second cooling assembly and the third cooling assembly are arranged on the gear box and are respectively connected with the gear box; the gearbox comprises a box body, a driving rotor, a first driven rotor and a second driven rotor; the driving rotor is movably arranged in the box body by using a ball bearing, and the end part of the driving rotor is positioned at the outer side part and is connected with the motor; the first driven rotor and the second driven rotor are positioned in the box body, are respectively arranged on two sides of the driving rotor and are connected with the driving rotor, and are movably connected with the inner wall of the box body.
Preferably, the first cooling assembly, the second cooling assembly and the third cooling assembly are all mounted on the box body and communicated; the first cooling assembly includes: the device comprises a first volute, a first partition plate, a first flow director and a first inlet pre-rotator; the first volute is fixedly connected with the first partition board, a ventilation cavity is formed in the first volute, the first deflector is fixedly installed in the ventilation cavity formed by the first volute and the first partition board and is connected with one end of the first driven rotor, and the first inlet pre-rotator is installed on the outer side of the first deflector; the second cooling assembly includes: the second volute, the second partition plate, the second flow director and the second inlet pre-rotator are formed; the second volute is fixedly connected with the second partition board, a ventilation cavity is formed in the second volute, the second deflector is fixedly installed in the ventilation cavity formed by the second volute and the second partition board and is connected with one end of the second driven rotor, and the second inlet pre-rotator is installed on the outer side of the second deflector; the second cooling assembly includes: the third volute, the third partition board, the third flow director and the third inlet pre-rotator are formed; the third volute is fixedly connected with the third partition board and is internally provided with a ventilation cavity, the third fluid director is fixedly installed in the ventilation cavity formed by the third volute and the third partition board and is connected with the other end of the second driven rotor, and the third inlet pre-rotator is installed on the outer side of the third fluid director.
Preferably, the air pipeline system comprises a primary air inlet assembly, a secondary air inlet assembly and a tertiary air inlet assembly; the first-stage air inlet assembly, the second-stage air inlet assembly and the third-stage air inlet assembly are connected in parallel; the primary air intake assembly includes: the device comprises a primary inlet pre-rotation mechanism, a primary anti-surge valve, a primary cooler, a primary blow-down valve and a primary check valve; an inlet of the primary inlet pre-rotation mechanism is connected with an inlet of the primary anti-surge valve and is used for inputting primary helium, an inlet of the primary cooler is connected with the primary inlet pre-rotation mechanism, an outlet of the primary cooler is connected with the primary emptying valve, and an outlet of the primary inlet pre-rotation mechanism is connected with an inlet of the primary check valve; in a further embodiment, the secondary air intake assembly comprises: a secondary inlet pre-rotation mechanism, a secondary anti-surge valve, a secondary cooler, a secondary blow-down valve and a secondary check valve; the inlet of the secondary inlet pre-rotation mechanism is connected with the inlet of the secondary anti-surge valve and is used for inputting secondary helium gas, the inlet of the secondary inlet pre-rotation mechanism is connected with the outlet of the primary check valve, the inlet of the secondary cooler is connected with the secondary inlet pre-rotation mechanism, the outlet of the secondary cooler is connected with the secondary blow-off valve, and the outlet of the secondary inlet pre-rotation mechanism is connected with the inlet of the secondary check valve; the secondary air intake assembly includes: a three-stage inlet pre-rotation mechanism, a three-stage anti-surge valve, a three-stage cooler, a three-stage emptying valve and a three-stage check valve; the inlet of the three-stage inlet pre-rotation mechanism is connected with the inlet of the three-stage anti-surge valve and is used for inputting three-stage helium gas, the inlet of the three-stage inlet pre-rotation mechanism is connected with the outlet of the second-stage check valve, the inlet of the three-stage cooler is connected with the second-stage inlet pre-rotation mechanism, and the outlet of the three-stage cooler is simultaneously connected with the outlet of the three-stage anti-surge valve, the outlet of the second-stage anti-surge valve, the outlet of the one-stage anti-surge valve, the three-stage emptying valve and the inlet of the three-stage check valve are connected, and the outlet of the three-stage check valve is connected with a compressor host.
In another aspect, a fault diagnosis method for a multi-shaft centrifugal compressor impeller, which employs the centrifugal compressor according to any one of the above, includes the steps of:
The testing module is used for timing and measuring a rotation pulse mixed signal generated by the impeller through the timing sensor;
Signal processing is carried out according to the pulse signals;
The main control computer receives and analyzes the processed signals, and extracts and locates the characteristics of fault points;
and performing fault processing according to the fixed point characteristics and the positions.
Preferably, the signal processing performs noise reduction on the pulse mixed signal containing noise, and performs noise reduction operation in a frequency band on the pulse mixed signal subjected to noise reduction by adopting a contraction function to complete noise separation of the multi-source pulse mixed signal.
Preferably, the noise reduction is to perform multi-level frequency band division processing on the pulse mixed signal in the full frequency band range, decompose the high-frequency signal which is not subdivided, reconstruct wavelet packet coefficients in the characteristic frequency band range based on the analyzed object frequency characteristic, and remove noise outside the characteristic frequency band.
Preferably, after the denoising operation is completed, an independent signal source is extracted, and noise reduction and separation are performed on the mixed signal containing noise through a contraction function, wherein a separation model is as follows:
Wherein the method comprises the steps of Is additive Gaussian white noise,/>Is an unbiased estimation result; noise reduction and separation are carried out on the mixed signal containing noise through a contraction function, namely:
Sparse distribution; /(I) Is a scale value, thereby outputting a noise-reduced and separated signal.
Preferably, after the multi-source pulse mixed signal is separated and noisy, signal enhancement is needed, noise energy is transferred to an available signal, so that resonance output is generated, and signal energy is enhanced; the specific method comprises the following steps:
step1, carrying out envelope demodulation operation on a separating result of separating noise signals of the multi-source pulse mixed signal to obtain an envelope time domain signal;
Step 2, performing frequency scale transformation on a certain section of signal to enable the frequency to meet a stochastic resonance condition;
Step 3, the transformed signals pass through a stochastic resonance system, so that available signals in the frequency band can be enhanced, and the signal-to-noise ratio is improved;
And 4, outputting the enhanced signal.
The beneficial effects are that: the invention discloses a centrifugal compressor, which consists of a support, a compressor main machine, a motor, an intercooler and a gas pipeline system, wherein the support is provided with a plurality of air inlets; the compressor main unit, the motor, the intercooler and the air pipeline system are fixedly arranged on the support, a power source of the compressor main unit is provided by the motor, the compressor main unit and the air pipeline system are composed, the air pipeline system is composed of an air inlet pipe group and an air outlet pipe group and is respectively connected with an air inlet and an air outlet of the compressor main unit, and the intercooler is connected with the compressor main unit; the invention combines pneumatic design optimization to make the main machine structure more reasonable, and utilizes the rotor dynamics analysis software and the bearing calculation software to determine the shaft system and the bearing of the compressor, thereby ensuring the running stability of the unit. And determining the gas path flow which is most favorable for safe operation through flow analysis and comparison.
Drawings
Fig. 1 is a schematic diagram of a compressor host of the present invention.
Fig. 2 is a main frame structure diagram of the compressor of the present invention.
Fig. 3 is a schematic diagram of the gas piping system of the present invention.
Fig. 4 is a flow chart of a fault diagnosis method of the multi-shaft centrifugal compressor impeller of the present invention.
Fig. 5 is a signal enhancement flow chart of the present invention.
Fig. 6 is a flowchart of the convolutional neural network operation of the present invention.
Fig. 7 is a block diagram of a convolutional neural network of the present invention.
Reference numerals: the compression gearbox 1, the first cooling assembly 2, the second cooling assembly 3, the third cooling assembly 4, the box 8, the driving rotor 5, the second driven rotor 6, the first driven rotor 7, the first volute 9, the first partition plate 10, the first deflector 11, the first inlet pre-rotator 12, the second volute 13, the second partition plate 14, the second deflector 15, the second inlet pre-rotator 16, the third volute 17, the third partition plate 18, the third deflector 19, the third inlet pre-rotator 20, the first inlet pre-rotator 21, the first anti-surge valve 22, the first cooler 23, the first blow-down valve 24, the first check valve 25, the second inlet pre-rotator 26, the second anti-surge valve 27, the second cooler 28, the second blow-down valve 29, the second check valve 30, the third inlet pre-rotator 31, the third anti-surge valve 32, the third cooler 33, the third blow-down valve 34, and the third check valve 35.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The multi-shaft centrifugal compressor consists of a support, a compressor main machine, a motor, an intercooler, an impeller and a gas pipeline system;
The air inlet pipe group and the air outlet pipe group are respectively connected with an air inlet and an air outlet of the compressor main unit, and the intercooler is connected with the compressor main unit.
In one embodiment, as shown in fig. 1, the compressor main unit is composed of a compression gearbox 1, a first cooling assembly 2, a second cooling assembly 3 and a third cooling assembly 4;
The first cooling assembly 2, the second cooling assembly 3 and the third cooling assembly 4 are mounted on the gear box and are respectively connected with the gear box.
In one embodiment, as shown in fig. 1, the gearbox is composed of a box body 8, a driving rotor 5, a first driven rotor 6 and a second driven rotor 7;
The driving rotor 5 is movably arranged in the box body 8 by using a ball bearing, and the end part of the driving rotor is positioned at the outer side part and is connected with the motor; the first driven rotor 6 and the second driven rotor 7 are located in the box 8, are respectively installed on two sides of the driving rotor 5 and are connected with the driving rotor 5, and the first driven rotor 7 and the second driven rotor 6 are movably connected with the inner wall of the box 8.
In one embodiment, as shown in fig. 2, the first cooling module 2, the second cooling module 3 and the third cooling module 4 are all mounted on the case 8 and communicate;
The first cooling module 2 includes: the first volute 9, the first partition plate 10, the first flow director 11 and the first inlet pre-rotator 12 are formed; the first volute 9 is fixedly connected with the first partition board 10, a ventilation cavity is formed in the first volute 9, the first deflector 11 is fixedly installed in the ventilation cavity formed by the first volute 9 and the first partition board 10 and is connected with one end of the first driven rotor 7, and the first inlet pre-rotator 12 is installed outside the first deflector 11.
In one embodiment, as shown in fig. 2, the second cooling assembly 3 includes: the second volute 13, the second partition 14, the second flow director 15 and the second inlet pre-rotator 16; the second volute 13 is fixedly connected with the second partition 14, a ventilation cavity is formed in the second volute, the second deflector 15 is fixedly installed in the ventilation cavity formed by the second volute 13 and the second partition 14 and is connected with one end of the second driven rotor 6, and the second inlet pre-rotator 16 is installed outside the second deflector 15.
In one embodiment, as shown in fig. 2, the third cooling assembly 4 includes: the third volute 17, the third partition 18, the third inducer 19 and the third inlet pre-rotator 20; the third volute 17 is fixedly connected with the third partition 18, a ventilation cavity is formed in the third volute, the third deflector 19 is fixedly installed in the ventilation cavity formed by the third volute 17 and the third partition 18 and is connected with the other end of the second driven rotor 6, and the third inlet pre-rotator 20 is installed outside the third deflector 19.
In one embodiment, as shown in FIG. 3, the air duct system is comprised of a primary air intake assembly, a secondary air intake assembly, and a tertiary air intake assembly; the first-stage air inlet assembly, the second-stage air inlet assembly and the third-stage air inlet assembly are connected in parallel.
In one embodiment, as shown in FIG. 3, the primary air intake assembly includes: a primary inlet pre-rotation mechanism 21, a primary anti-surge valve 22, a primary cooler 23, a primary blow-down valve 24 and a primary check valve 25;
an inlet of the primary inlet pre-rotation mechanism 21 is connected with an inlet of the primary anti-surge valve 22 and is used for inputting primary helium, an inlet of the primary cooler 23 is connected with the primary inlet pre-rotation mechanism 21, an outlet of the primary cooler 23 is connected with the primary blow-off valve 24, and an outlet of the primary inlet pre-rotation mechanism 21 is connected with an inlet of the primary check valve 25.
In one embodiment, as shown in FIG. 3, the secondary air intake assembly comprises: a secondary inlet pre-rotation mechanism 26, a secondary anti-surge valve 27, a secondary cooler 28, a secondary blow-off valve 29 and a secondary check valve 30;
The inlet of the secondary inlet pre-rotation mechanism 26 is connected with the inlet of the secondary anti-surge valve 27 and is used for inputting secondary helium, the inlet of the secondary inlet pre-rotation mechanism 26 is connected with the outlet of the primary check valve 25, the inlet of the secondary cooler 28 is connected with the secondary inlet pre-rotation mechanism 26, the outlet of the secondary cooler 28 is connected with the secondary emptying valve 29, and the outlet of the secondary inlet pre-rotation mechanism 26 is connected with the inlet of the secondary check valve 30.
In one embodiment, as shown in FIG. 3, the secondary air intake assembly comprises: a three-stage inlet pre-rotation mechanism 31, a three-stage anti-surge valve 32, a three-stage cooler 33, a three-stage blow-down valve 34 and a three-stage check valve 35;
the inlet of the three-stage inlet pre-rotation mechanism 31 is connected with the inlet of the three-stage anti-surge valve 32 and is used for inputting three-stage helium gas, the inlet of the three-stage inlet pre-rotation mechanism 31 is connected with the outlet of the two-stage check valve 30, the inlet of the three-stage cooler 33 is connected with the two-stage inlet pre-rotation mechanism 26, the outlet of the three-stage cooler 33 is simultaneously connected with the outlet of the three-stage anti-surge valve 32, the outlet of the two-stage anti-surge valve 27, the outlet of the one-stage anti-surge valve 22, the three-stage blow-down valve 34 and the inlet of the three-stage check valve 35, and the outlet of the three-stage check valve 35 is connected with a compressor host.
In one embodiment, as shown in fig. 1 to 3, a section of gas is input from a gas pipeline system to an inlet pre-rotator of a compressor host machine, enters a first-stage impeller, is compressed by the first-stage impeller, increases the pressure, enters the first-stage diffuser, reduces the gas flow rate, increases the pressure again, is collected by a volute, flows out along with an exhaust pipe, is cooled by a gas cooler, is mixed with a second-stage gas inlet, enters a second-stage impeller for compression, also collects a second-stage outlet gas, is mixed with a third-stage gas after being cooled, then enters a third-stage impeller for compression, and is sequentially circulated to fulfill requirements;
The inlet pre-rotation regulator is arranged in front of the inlet of each stage of impeller, the transmission mechanism is driven by the pneumatic actuating mechanism, and the transmission mechanism controls the rotation of the impeller, so that the pre-rotation angle of inlet airflow is changed, and the flow of each stage of impeller is controlled. Compared with the traditional adjusting mode of adjusting the load of the compressor by adjusting the opening of the air inlet valve, the method has the advantages of small throttling loss and wider adjusting range, can realize the efficient operation of the compressor within the range of 70% -100%, and is particularly suitable for constant-rotation-speed compressors.
In one embodiment, as shown in fig. 3, the anti-surge of each section of the compressor flows back from the last stage, so that even if the inlet flow of the front section is insufficient, the flow after the backflow after the operation of the anti-surge valve enters the rear section, the flow of the rear section is not greatly influenced, and the anti-surge operation of the rear section is not influenced. According to the anti-surge flow configured as described above, compression and normal operation are not problematic, but when the compressor is in emergency stop, the first-stage outlet is communicated with the second-stage air-supplementing pipe network, the second-stage outlet is communicated with the third-stage air-supplementing official network, and when the compressor is in emergency stop, the first-stage outlet and the second-stage outlet cannot be rapidly depressurized, so that damage to the compressor can be caused. Therefore, a first section of vent valve and a second section of vent valve are additionally arranged at the first section of outlet and the second section of outlet, and the three vent valve outlets are connected into the vent silencer together.
The invention is provided with a detection system outside the compressor, and the safety detection of the compressor impeller is carried out after the compressor is operated. As shown in fig. 4, a fault diagnosis method for a multi-shaft centrifugal compressor impeller, which can realize fault diagnosis for the impeller, adopts the centrifugal compressor according to any one of the above, comprises the following steps:
The testing module is used for timing and measuring a rotation pulse mixed signal generated by the impeller through the timing sensor;
Signal processing is carried out according to the pulse signals;
The main control computer receives and analyzes the processed signals, and extracts and locates the characteristics of fault points;
and performing fault processing according to the fixed point characteristics and the positions.
In one embodiment, the signal processing performs noise reduction on the pulse mixed signal containing noise, and performs noise reduction operation in a frequency band on the pulse mixed signal after noise reduction by adopting a contraction function to complete noise separation of the multi-source pulse mixed signal.
In one embodiment, the noise reduction is to perform multi-level frequency band division processing on the pulse mixed signal in the full frequency band range, decompose the high-frequency signal which is not subdivided, reconstruct wavelet packet coefficients in the characteristic frequency band range based on the analyzed object frequency characteristics, and remove noise outside the characteristic frequency band.
In one embodiment, after the denoising operation is completed, extracting a signal independent source, and denoising and separating the mixed signal containing noise through a contraction function, wherein a separation model is as follows:
Wherein the method comprises the steps of Is additive Gaussian white noise,/>For the unbiased estimation result, noise reduction and separation are carried out on the mixed signal containing noise through a contraction function, namely:
Sparse distribution; /(I) Is a scale value, thereby outputting a noise-reduced and separated signal.
In one embodiment, as shown in fig. 5, after the multi-source pulse mixed signal separation and noise removal is completed, signal enhancement is required to transfer noise energy to an available signal, so as to generate a resonance output, and the signal energy is enhanced; the specific method comprises the following steps:
step1, carrying out envelope demodulation operation on a separating result of separating noise signals of the multi-source pulse mixed signal to obtain an envelope time domain signal;
Step 2, performing frequency scale transformation on a certain section of signal to enable the frequency to meet a stochastic resonance condition;
Step 3, the transformed signals pass through a stochastic resonance system, so that available signals in the frequency band can be enhanced, and the signal-to-noise ratio is improved;
And 4, outputting the enhanced signal.
In one embodiment, the signal processing according to the pulse signal firstly performs a process of de-averaging and centering on the observed signal, and then performs a process of whitening the observed signal, namely: and/> For whitening matrix,/>To observe the signal matrix; the covariance matrix of the processed observation signal matrix is made into a unit matrix through linear transformation, and the aim is to remove the second-order correlation among the components of the observation signal.
In one embodiment, the feature extraction and positioning of the fault point is implemented by constructing a network diagnosis training model in a diagnosis program of the compressor, so as to enhance the execution target and the task completion efficiency; observing fault conditions of the compressor, measuring quasi-curve value variation conditions of different fault areas by a depth analysis method, simultaneously constructing a depth fault diagnosis matrix under a Bayesian network by combining a convolutional neural network processing technology, realizing multi-target integrated diagnosis, acquiring diagnosis results of each position of the compressor from multiple directions, and forming a depth fault diagnosis mechanism according to diagnosis layers and targets.
Referring to fig. 7, in one embodiment, the structure of the convolutional neural network includes an input layer, an activation function, a convolutional layer, a pooling layer, a hidden layer, a fully connected layer, and an output layer, and the convolutional neural network can complete the overall process of feature extraction, degradation, and classification of the monitored data.
In one embodiment, referring to fig. 6, the specific steps of the convolutional neural network are as follows:
firstly, cleaning the original data, wherein the focus is to process the missing value in the original data, so that spline interpolation is considered to complement the data;
After processing the original data, inputting the data into a neural network model, and entering a convolution layer to carry out convolution calculation on an input signal so as to extract characteristics;
after the convolution layer performs feature extraction, the output features complete feature selection and signal filtration through the pooling layer;
at the feature extracted through the convolution layer, the activation layer and the pooling layer, the data features extracted at the filtering stage are classified at the full connection layer and the result is output.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (8)
1. The multi-shaft centrifugal compressor is characterized by comprising a support, an impeller, a compressor main machine, a motor, an intercooler and a gas pipeline system; the impeller is sleeved on the driving rotor of the compressor main machine, and a detection system is connected outside the compressor main machine and used for carrying out safety detection on the impeller after working;
The compressor main unit, the motor, the intercooler and the air pipeline system are fixedly arranged on the support, a power source of the compressor main unit is provided by the motor, the air pipeline system is composed of an air inlet pipe group and an air outlet pipe group and is respectively connected with an air inlet and an air outlet of the compressor main unit, and the intercooler is connected with the compressor main unit;
the compressor main machine consists of a compression gear box, a first cooling assembly, a second cooling assembly and a third cooling assembly; the first cooling assembly, the second cooling assembly and the third cooling assembly are arranged on the gear box and are respectively connected with the gear box;
The gearbox comprises a box body, a driving rotor, a first driven rotor and a second driven rotor; the driving rotor is movably arranged in the box body by using a ball bearing, and the end part of the driving rotor is positioned at the outer side part and is connected with the motor; the first driven rotor and the second driven rotor are positioned in the box body, are respectively arranged on two sides of the driving rotor and are connected with the driving rotor, and are movably connected with the inner wall of the box body.
2. The multi-shaft centrifugal compressor of claim 1, wherein the first cooling assembly, the second cooling assembly, and the third cooling assembly are all mounted on and in communication with the tank; the first cooling assembly includes: the device comprises a first volute, a first partition plate, a first flow director and a first inlet pre-rotator; the first volute is fixedly connected with the first partition board, a ventilation cavity is formed in the first volute, the first deflector is fixedly installed in the ventilation cavity formed by the first volute and the first partition board and is connected with one end of the first driven rotor, and the first inlet pre-rotator is installed on the outer side of the first deflector;
And/or, the second cooling assembly comprises: the second volute, the second partition plate, the second flow director and the second inlet pre-rotator are formed; the second volute is fixedly connected with the second partition board, a ventilation cavity is formed in the second volute, the second deflector is fixedly installed in the ventilation cavity formed by the second volute and the second partition board and is connected with one end of the second driven rotor, and the second inlet pre-rotator is installed on the outer side of the second deflector;
And/or, the third cooling assembly comprises: the third volute, the third partition board, the third flow director and the third inlet pre-rotator are formed; the third volute is fixedly connected with the third partition board and is internally provided with a ventilation cavity, the third fluid director is fixedly installed in the ventilation cavity formed by the third volute and the third partition board and is connected with the other end of the second driven rotor, and the third inlet pre-rotator is installed on the outer side of the third fluid director.
3. The multi-shaft centrifugal compressor of claim 2, wherein the gas line system is comprised of a primary gas intake assembly, a secondary gas intake assembly, and a tertiary gas intake assembly; the first-stage air inlet assembly, the second-stage air inlet assembly and the third-stage air inlet assembly are connected in parallel; the primary air intake assembly includes: the device comprises a primary inlet pre-rotation mechanism, a primary anti-surge valve, a primary cooler, a primary blow-down valve and a primary check valve; an inlet of the primary inlet pre-rotation mechanism is connected with an inlet of the primary anti-surge valve and is used for inputting primary helium, an inlet of the primary cooler is connected with the primary inlet pre-rotation mechanism, an outlet of the primary cooler is connected with the primary emptying valve, and an outlet of the primary inlet pre-rotation mechanism is connected with an inlet of the primary check valve;
And/or, the secondary air intake assembly comprises: a secondary inlet pre-rotation mechanism, a secondary anti-surge valve, a secondary cooler, a secondary blow-down valve and a secondary check valve; the inlet of the secondary inlet pre-rotation mechanism is connected with the inlet of the secondary anti-surge valve and is used for inputting secondary helium gas, the inlet of the secondary inlet pre-rotation mechanism is connected with the outlet of the primary check valve, the inlet of the secondary cooler is connected with the secondary inlet pre-rotation mechanism, the outlet of the secondary cooler is connected with the secondary blow-off valve, and the outlet of the secondary inlet pre-rotation mechanism is connected with the inlet of the secondary check valve;
and/or, the secondary air intake assembly comprises: a three-stage inlet pre-rotation mechanism, a three-stage anti-surge valve, a three-stage cooler, a three-stage emptying valve and a three-stage check valve; the inlet of the three-stage inlet pre-rotation mechanism is connected with the inlet of the three-stage anti-surge valve and is used for inputting three-stage helium gas, the inlet of the three-stage inlet pre-rotation mechanism is connected with the outlet of the second-stage check valve, the inlet of the three-stage cooler is connected with the second-stage inlet pre-rotation mechanism, and the outlet of the three-stage cooler is simultaneously connected with the outlet of the three-stage anti-surge valve, the outlet of the second-stage anti-surge valve, the outlet of the one-stage anti-surge valve, the three-stage emptying valve and the inlet of the three-stage check valve are connected, and the outlet of the three-stage check valve is connected with a compressor host.
4. A fault diagnosis method of a multi-shaft centrifugal compressor impeller employing the centrifugal compressor according to any one of claims 1 to 3, comprising the steps of:
The testing module is used for timing and measuring a rotation pulse mixed signal generated by the impeller through the timing sensor;
Signal processing is carried out according to the pulse signals;
The main control computer receives and analyzes the processed signals, and extracts and locates the characteristics of fault points;
and performing fault processing according to the fixed point characteristics and the positions.
5. The method for diagnosing a failure of a multi-axis centrifugal compressor impeller according to claim 4, wherein the signal processing performs noise reduction on the pulse mixed signal containing noise, and the noise reduction operation in the frequency band is performed on the pulse mixed signal after the noise reduction by using a contraction function, thereby completing the noise separation of the multi-source pulse mixed signal.
6. The method according to claim 5, wherein the noise reduction is a multi-level frequency band division process for the pulse mixed signal in a full frequency band range, a high-frequency signal which is not subdivided is decomposed, wavelet packet coefficients in a characteristic frequency band range are reconstructed based on the analyzed object frequency characteristics, and noise outside the characteristic frequency band is removed.
7. The method for diagnosing a failure of a multi-shaft centrifugal compressor impeller according to claim 6, wherein after the denoising operation is completed, an independent source of the extracted signal is performed, and the mixed signal containing noise is subjected to noise reduction separation by a contraction function, and the separation model is:
Wherein the method comprises the steps of Is additive Gaussian white noise,/>Is an unbiased estimation result; noise reduction and separation are carried out on the mixed signal containing noise through a contraction function, namely:
Sparse distribution; /(I) Is a scale value, thereby outputting a noise-reduced and separated signal.
8. The method for diagnosing a failure of a multi-axis centrifugal compressor impeller according to claim 7, wherein after the multi-source pulse mixed signal is separated from the noise, a signal enhancement operation is required to transfer noise energy to the available signal, thereby generating a resonance output to promote the enhancement of the signal energy; the specific method comprises the following steps:
step1, carrying out envelope demodulation operation on a separating result of separating noise signals of the multi-source pulse mixed signal to obtain an envelope time domain signal;
Step 2, performing frequency scale transformation on a certain section of signal to enable the frequency to meet a stochastic resonance condition;
Step 3, the transformed signals pass through a stochastic resonance system, so that available signals in the frequency band can be enhanced, and the signal-to-noise ratio is improved;
And 4, outputting the enhanced signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410319129.2A CN117905711B (en) | 2024-03-20 | 2024-03-20 | Multi-shaft centrifugal compressor and fault diagnosis method for impeller of multi-shaft centrifugal compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410319129.2A CN117905711B (en) | 2024-03-20 | 2024-03-20 | Multi-shaft centrifugal compressor and fault diagnosis method for impeller of multi-shaft centrifugal compressor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117905711A true CN117905711A (en) | 2024-04-19 |
| CN117905711B CN117905711B (en) | 2024-07-23 |
Family
ID=90689532
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410319129.2A Active CN117905711B (en) | 2024-03-20 | 2024-03-20 | Multi-shaft centrifugal compressor and fault diagnosis method for impeller of multi-shaft centrifugal compressor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117905711B (en) |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201916218U (en) * | 2010-12-30 | 2011-08-03 | 沈阳鼓风机集团股份有限公司 | Gear type air compressor for PTA (pure terephthalic acid) device |
| CN104165925A (en) * | 2014-08-06 | 2014-11-26 | 沈阳透平机械股份有限公司 | Stochastic resonance based method for detecting crack failure of semi-open type impeller of centrifugal compressor |
| CN104485113A (en) * | 2014-12-23 | 2015-04-01 | 长沙理工大学 | Multi-fault-source acoustic emission signal separation method |
| CN105264233A (en) * | 2014-01-23 | 2016-01-20 | 三菱重工压缩机有限公司 | Centrifugal compressor |
| CN105264316A (en) * | 2013-04-04 | 2016-01-20 | 诺沃皮尼奥内股份有限公司 | Integrally-geared compressors for precooling in LNG applications |
| CN205423207U (en) * | 2016-03-23 | 2016-08-03 | 上海钛灵特压缩机有限公司 | Symmetrical arrangement centrifugal compressor |
| CN107429702A (en) * | 2014-12-16 | 2017-12-01 | 诺沃皮尼奥内股份有限公司 | Compression unit for high pressure service and low pressure service |
| CN107702921A (en) * | 2017-09-04 | 2018-02-16 | 西安交通大学 | The underdamping stable state matching accidental resonance Weak characteristic Enhancement Method of parameter induction |
| CN115479034A (en) * | 2021-06-14 | 2022-12-16 | 气体产品与化学公司 | Method and apparatus for compressing a feed gas with variable flow rate |
| CN115655455A (en) * | 2022-10-14 | 2023-01-31 | 山东临工工程机械有限公司 | Mechanical fault diagnosis method based on adaptive noise transformation and stochastic resonance |
| CN116020344A (en) * | 2022-12-08 | 2023-04-28 | 西安陕鼓动力股份有限公司 | Method for operating a gas-electric double-drive air supply device for a maleic anhydride production system |
| CN116123907A (en) * | 2023-01-20 | 2023-05-16 | 西安陕鼓动力股份有限公司 | Compressed air energy storage system and method for recycling waste heat |
| CN219865505U (en) * | 2023-04-03 | 2023-10-20 | 沈阳鼓风机集团齿轮压缩机有限公司 | Multi-shaft centrifugal compressor and compression system |
-
2024
- 2024-03-20 CN CN202410319129.2A patent/CN117905711B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201916218U (en) * | 2010-12-30 | 2011-08-03 | 沈阳鼓风机集团股份有限公司 | Gear type air compressor for PTA (pure terephthalic acid) device |
| CN105264316A (en) * | 2013-04-04 | 2016-01-20 | 诺沃皮尼奥内股份有限公司 | Integrally-geared compressors for precooling in LNG applications |
| CN105264233A (en) * | 2014-01-23 | 2016-01-20 | 三菱重工压缩机有限公司 | Centrifugal compressor |
| CN104165925A (en) * | 2014-08-06 | 2014-11-26 | 沈阳透平机械股份有限公司 | Stochastic resonance based method for detecting crack failure of semi-open type impeller of centrifugal compressor |
| CN107429702A (en) * | 2014-12-16 | 2017-12-01 | 诺沃皮尼奥内股份有限公司 | Compression unit for high pressure service and low pressure service |
| CN104485113A (en) * | 2014-12-23 | 2015-04-01 | 长沙理工大学 | Multi-fault-source acoustic emission signal separation method |
| CN205423207U (en) * | 2016-03-23 | 2016-08-03 | 上海钛灵特压缩机有限公司 | Symmetrical arrangement centrifugal compressor |
| CN107702921A (en) * | 2017-09-04 | 2018-02-16 | 西安交通大学 | The underdamping stable state matching accidental resonance Weak characteristic Enhancement Method of parameter induction |
| CN115479034A (en) * | 2021-06-14 | 2022-12-16 | 气体产品与化学公司 | Method and apparatus for compressing a feed gas with variable flow rate |
| CN115655455A (en) * | 2022-10-14 | 2023-01-31 | 山东临工工程机械有限公司 | Mechanical fault diagnosis method based on adaptive noise transformation and stochastic resonance |
| CN116020344A (en) * | 2022-12-08 | 2023-04-28 | 西安陕鼓动力股份有限公司 | Method for operating a gas-electric double-drive air supply device for a maleic anhydride production system |
| CN116123907A (en) * | 2023-01-20 | 2023-05-16 | 西安陕鼓动力股份有限公司 | Compressed air energy storage system and method for recycling waste heat |
| CN219865505U (en) * | 2023-04-03 | 2023-10-20 | 沈阳鼓风机集团齿轮压缩机有限公司 | Multi-shaft centrifugal compressor and compression system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN117905711B (en) | 2024-07-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Sakthivel et al. | Vibration based fault diagnosis of monoblock centrifugal pump using decision tree | |
| CN102803736B (en) | Control system | |
| CN101178074A (en) | Pre-judging method for compressor surge | |
| RU2014116907A (en) | METHOD AND SYSTEM OF DIAGNOSTICS OF POWER UNIT WITH TWO MULTI-STAGE TURBOCHARGERS | |
| CN112443479A (en) | Compressor fault diagnosis method and device, storage medium and electronic equipment | |
| JP2021018818A (en) | Propeller cavitation state detection method based on wavelet and principal component analysis | |
| CN112036480A (en) | Ship refrigeration system fault diagnosis method and device and storage medium | |
| CN117905711B (en) | Multi-shaft centrifugal compressor and fault diagnosis method for impeller of multi-shaft centrifugal compressor | |
| CN114708885A (en) | Fan fault early warning method based on sound signals | |
| Aravinth et al. | Air compressor fault diagnosis through statistical feature extraction and random forest classifier | |
| CN111881848A (en) | Motor fault signal extraction method based on variational modal decomposition and improved particle swarm | |
| CN110953179A (en) | Fan state monitoring method and system based on inverse wavelet transform | |
| Muralidharan et al. | Wavelet decomposition and support vector machine for fault diagnosis of monoblock centrifugal pump | |
| CN114323691A (en) | Gas circuit fault diagnosis device and method for compressed air energy storage system | |
| Meduri et al. | CFD analysis of centrifugal compressor stage range extension using internal flow recirculation | |
| CN111610021B (en) | Early fault detection method for gearbox | |
| CN111059004B (en) | Automatic state monitoring method and system suitable for fan series | |
| CN117432647A (en) | High-power high-pressure ratio centrifugal compressor performance test system and test method thereof | |
| CN115688319A (en) | Variable cycle compression system test matching characteristic modeling method | |
| CN113657556B (en) | Gas turbine inlet guide vane system fault diagnosis method based on multivariate statistical analysis | |
| CN113404707B (en) | A booster tower for space division | |
| CN114462448A (en) | Method for identifying running state of water turbine | |
| CN110146267B (en) | Method for detecting flutter of valve plate of totally-enclosed refrigeration compressor | |
| Hongkun et al. | Intelligent identification of rotating stall for centrifugal compressor based on pressure pulsation signals and SDKAE network | |
| Wang et al. | Fault diagnosis of reciprocating compressor using component estimating empirical mode decomposition and de-dimension template with double-loop correction algorithm |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant |