CN113431864A - Method for processing structural vibration of rotating mechanical equipment of thermal power plant - Google Patents
Method for processing structural vibration of rotating mechanical equipment of thermal power plant Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/021—Decoupling of vibrations by means of point-of-contact supports, e.g. ball bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/04—Devices damping pulsations or vibrations in fluids
- F16L55/041—Devices damping pulsations or vibrations in fluids specially adapted for preventing vibrations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/04—Bearings
- G01M13/045—Acoustic or vibration analysis
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/24—Casings; Enclosures; Supports specially adapted for suppression or reduction of noise or vibrations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F2230/00—Purpose; Design features
- F16F2230/0047—Measuring, indicating
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Abstract
The invention discloses a method for processing structural vibration of rotating mechanical equipment in a thermal power plant, which comprises the following steps of: analyzing the structural vibration reason of the rotating mechanical equipment of the thermal power plant; when the structural vibration is caused by coupling resonance between components of the rotary mechanical equipment of the thermal power plant, decoupling processing is carried out on the components with the coupling resonance by adopting a vibration isolation gasket technology; when the structural vibration is caused by the structural vibration of the rotary mechanical equipment of the thermal power plant under the action of the pipeline, the vibration transmission of the pipeline is blocked by adopting the corrugated joint vibration absorption technology; when the structural vibration is caused by structural resonance of parts of the rotary mechanical equipment of the thermal power plant, the vibration reduction supporting technology is adopted to perform frequency modulation processing on the parts with the structural resonance, the frequency modulation processing is performed on the parts with the structural resonance by adding particles or the frequency modulation processing is performed on the parts with the structural resonance by placing a heavy object, and the method can diagnose and process the structural vibration of the rotary mechanical equipment of the thermal power plant.
Description
Technical Field
The invention belongs to the field of power mechanical engineering, and relates to a method for processing structural vibration of rotary mechanical equipment in a thermal power plant.
Background
The rotary machine is a main tool for energy conversion of a power plant and is also an important guarantee for stable power production, and vibration fault diagnosis and treatment of rotary equipment are the first matters for safe operation in many power plants.
Rotary machines include rotor vibration and vibration of stationary structures such as bearing housings. The vibration of the rotor is mainly caused by mass unbalance, unbalance and the like, the faults are easy to solve through field overhaul, dynamic balance tests and the like, and the vibration of structural components such as a bearing seat and the like is mostly caused by resonance and the like. Although dynamic calculations or tests are carried out by relevant units in the design and manufacturing processes of the rotary machine, the natural frequency of the structure is changed due to field installation flaws, foundation settlement in operation, loosening of fasteners, arrangement of associated pipeline systems and the like, and the natural frequency falls into a working rotating speed region, so that the structure is caused to generate severe vibration under a certain working condition. To eliminate the structural vibration, the source of changing the structural characteristics of the rotating machine must be found, but the rotating machine has many coupling parts, the on-site process pipeline is complicated, many rotating devices are repeatedly returned to the factory for maintenance and repeated treatment on the site, and the structural vibration cannot be effectively solved, which also becomes an important issue troubling the power plant.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for processing the structural vibration of the rotary mechanical equipment of the thermal power plant, which can diagnose and process the structural vibration of the rotary mechanical equipment of the thermal power plant.
In order to achieve the above purpose, the method for processing the structural vibration of the rotating mechanical equipment of the thermal power plant comprises the following steps:
performing vibration test and evaluation on the rotating mechanical equipment of the thermal power plant;
analyzing the structural vibration reason of the rotating mechanical equipment of the thermal power plant;
when the structural vibration is caused by coupling resonance between components of the rotary mechanical equipment of the thermal power plant, decoupling processing is carried out on the components with the coupling resonance by adopting a vibration isolation gasket technology;
when the structural vibration is caused by the structural vibration of the rotary mechanical equipment of the thermal power plant under the action of the pipeline, the vibration transmission of the pipeline is blocked by adopting the corrugated joint vibration absorption technology;
when structural vibration is caused by structural resonance of parts of the rotating mechanical equipment of the thermal power plant, the vibration reduction supporting technology is adopted to perform frequency modulation processing on the parts with the structural resonance, the parts with the structural resonance are subjected to frequency modulation processing by adding particles, or the foundation or the platform with the structural resonance is subjected to frequency modulation processing by placing a heavy object.
The specific process of vibration test and evaluation of the rotating mechanical equipment of the thermal power plant comprises the following steps:
11) marking vibration measurement positions in three directions on a bearing seat of rotary mechanical equipment of a thermal power plant;
12) in the vibration measurement position, the rotary mechanical equipment of the thermal power plant is subjected to vibration test, the vibration condition is evaluated according to a preset vibration limit value, and meanwhile, the vibration of the rotary mechanical equipment of the thermal power plant is classified according to the early warning level by combining the importance degree of the equipment, so that a fault equipment list is formed.
And comparing and analyzing the vibration of each part in the rotary mechanical equipment of the thermal power plant before and after connection, and when the vibration amplitude of each part in the rotary mechanical equipment of the thermal power plant before and after connection is increased by more than 100%, confirming that the vibration source of the rotary mechanical equipment of the thermal power plant is the coupling resonance caused by the loaded motor, and decoupling the part with the coupling resonance by adopting the vibration isolation gasket technology.
The flow test is carried out on the inlet and outlet pipeline of the rotary mechanical equipment of the thermal power plant, when the vibration amplitude difference under each flow working condition exceeds 100 percent and the structural vibration of the rotary mechanical equipment of the thermal power plant is qualified under a certain flow working condition, the structural vibration is considered to be caused by the fluid excitation in the inlet and outlet pipeline, and then the vibration transmission of the pipeline is blocked by adopting the corrugated joint vibration absorption technology.
The vibration isolation rate γ of the vibration isolation gasket is:
wherein, omega is the excitation frequency, m is the mass of the rotating machinery equipment of the thermal power plant, h is the thickness of the vibration isolation gasket, s is the area of the vibration isolation gasket, E is the elastic modulus of the vibration isolation gasket, and zeta is the damping ratio of the vibration isolation gasket.
The specific process of adopting the corrugated joint vibration absorption technology to block the vibration transmission of the pipeline comprises the following steps:
41) calculating the natural frequency omega of the vibration absorber mode of the corrugated joint as follows:
wherein K is rigidity, m is mass, N is corrugation pitch number, C is flexibility coefficient, E is elastic modulus, I is section inertia distance, and l, d and r are structural parameters of the corrugated pipe;
42) exciting frequency omega according to structural vibration of rotating mechanical equipment of thermal power plant0And selecting structural parameters of the corrugated joint, so that the modal natural frequency of the vibration absorber of the corrugated joint is equal to the excitation frequency of the structural vibration of the rotary mechanical equipment of the thermal power plant, simultaneously the overall dimension of the corrugated pipe is matched with the diameter of an inlet and outlet pipeline of the rotary mechanical equipment of the thermal power plant, and the corrugated pipe can bear the fluid excitation force by optimizing the number N, the material and the thickness of the corrugated joint of the corrugated pipe.
The specific process of carrying out frequency modulation processing on the component with structural resonance by adopting the vibration reduction supporting technology comprises the following steps: installation strutting arrangement, strutting arrangement includes the riser, the bottom plate, expansion bolts, positioning bolt, the rand, pretension bolt, the internal diameter, rotor groove and horizontal stay bolt, wherein, the riser is fixed in on the bottom plate, the bottom plate is fixed in on the basis through expansion bolts, the bottom of rand is fixed in the top of riser, the open-top part of rand is connected through pretension bolt, and the top of riser is provided with the rotor groove, when using, the rand cup joints on thermal power plant rotating machinery's bearing frame, horizontal stay bolt pass the screw hole on the rand with the bearing frame contacts, positioning bolt passes riser and thermal power plant rotating machinery's bearing frame fixed connection.
The specific process of frequency modulation processing of the component with structural resonance by adding the particulate matter is as follows:
determining the diameter, density and filling weight of the particles according to the vibration excitation frequency of the structural vibration of the rotating mechanical equipment of the thermal power plant;
and selecting the particles according to the determined diameter, density and filling weight of the particles, and filling the particles on the equipment frame or the shell.
The frequency modulation of a foundation or platform having structural resonance by placing a weight is characterized in that the weight is a heavy casting.
The invention has the following beneficial effects:
when the method for processing the structural vibration of the rotary mechanical equipment of the thermal power plant is specifically operated, the vibration is processed by analyzing the reason of the structural vibration and selecting a vibration isolation gasket technology, a corrugated joint vibration absorption technology, a vibration absorption support technology and a mode of adding particles or placing heavy objects, so that the structural vibration of the rotary mechanical equipment of the thermal power plant is diagnosed and processed.
Drawings
FIG. 1a is a diagram of vibration measurement positions of a rotating machine of a horizontally arranged thermal power plant;
FIG. 1b is a diagram of vibration measurement positions of a rotating machine of a vertically arranged thermal power plant;
FIG. 2 is a schematic structural dimension diagram of a corrugated segment;
FIG. 3 is a schematic structural view of the supporting device;
FIG. 4 is a structural resonance diagram of a free end bearing of the water feed pump of 2A;
FIG. 5 is a graph of bearing vibration after the vibration reduction support technique has been employed;
FIG. 6 is a vibration diagram before adding a bellows segment;
FIG. 7 is a vibration diagram after adding a bellows segment;
FIG. 8 is a schematic view of a polyvinyl chloride fluoride material pad;
FIG. 9 is a graph showing a frequency doubling vibration and a frequency doubling vibration;
fig. 10 is a schematic view after placing the steel ball.
Wherein, 1 is the bottom plate 1, 2 is the expansion bolt 2, 3 is the riser 3, 4 is the positioning bolt 4, 5 is the rand 5, 6 is the pretension bolt 6, 7 is the internal diameter 7, 8 is the rotor groove 8, 9 is the horizontal bracing bolt 9, 10 is the screw hole 10.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
The invention relates to a method for processing structural vibration of a rotating mechanical bearing seat and the like of a thermal power plant, which comprises the following steps of:
1) during operation, vibration test and evaluation are carried out on the rotary mechanical equipment of the thermal power plant regularly, and a fault equipment list is made according to test and evaluation results, as shown in table 1;
2) analyzing the structural vibration reason of the rotating mechanical equipment of the thermal power plant;
3) when coupling resonance exists between components of the rotary mechanical equipment of the thermal power plant, decoupling processing is carried out on the components with the coupling resonance by adopting a vibration isolation gasket technology;
4) when the rotary mechanical equipment of the thermal power plant is subjected to structural vibration caused by the action of the pipeline, the vibration transmission of the pipeline is blocked by adopting a corrugated joint vibration absorption technology;
5) when structural resonance of parts exists in the rotating mechanical equipment of the thermal power plant, the vibration reduction supporting technology is adopted to carry out frequency modulation processing on the parts with the structural resonance, or frequency modulation processing is carried out on the parts with the structural resonance by adding particles or placing heavy objects.
The specific operation of the step 1) is as follows:
11) marking vibration measuring points of each auxiliary device, namely marking vibration measuring positions in three directions on a supporting bearing seat, wherein when the vibration measuring positions cannot be marked, the vibration measuring positions are close to a bearing as much as possible and are sensitive enough to dynamic force generated by the operation of the device;
12) and in the vibration measurement position, performing vibration test on the rotating mechanical equipment of the thermal power plant, evaluating the vibration condition according to a vibration limit value given by the equipment operation rule, and classifying the vibration of the equipment according to the importance degree of the equipment, wherein the classification is performed on the early warning level, and a fault equipment list is formed as shown in a table 2.
In actual operation, vibration processing of the third-level early warning device, the second-level early warning device and the first-level early warning device is performed in sequence.
In addition, the results of two adjacent vibration measurements are compared, and when the vibration amplitude change at the same vibration measurement position exceeds 25% of the vibration limit value or the vibration phase change exceeds 90 degrees, the vibration early warning of the equipment is improved by one level.
TABLE 1
In table 1, P represents power, H represents center height, the center height of the horizontal equipment is the distance between the axis of the rotor and the upper plane of the base, the center height of the vertical equipment is half of the diameter of the machine, and n represents the working rotating speed.
TABLE 2
The specific operation of the step 2) is as follows:
21) the vibration before and after each part of the rotating mechanical equipment of the thermal power plant is connected is contrasted and analyzed, for example: comparing the single rotation of the motor with the vibration under the load working condition; comparing the vibration of the motor frame before and after fastening by the connecting bolt; etc.; when the vibration amplitude before and after connection is increased by more than 100%, the vibration source of the rotary mechanical equipment of the thermal power plant is determined to be coupled resonance caused by the loaded motor, and the decoupling treatment is carried out by adopting the vibration isolation gasket technology;
22) flow tests are carried out on inlet and outlet pipelines of rotary mechanical equipment of a thermal power plant, when the vibration amplitude difference under various flow working conditions exceeds 100 percent and the vibration is qualified under a certain flow working condition, the fluid in the pipelines is considered to be excited to cause structural vibration, and therefore the corrugated joint technology is adopted to carry out vibration absorption treatment on components;
23) if the two factors are eliminated, the vibration damping support, the weight and the particle damping technology are selected to perform frequency modulation processing on the component if the component resonance problem of the rotary mechanical equipment of the thermal power plant is considered.
The specific operation of the step 3) is as follows:
the vibration isolation rate γ of the vibration isolation gasket is:
where ω is the excitation frequency, m is the rotating machine mass, h is the thickness of the vibration isolation pad, s is the area of the vibration isolation pad, E is the elastic modulus of the vibration isolation pad, and ζ is the damping ratio of the vibration isolation pad.
Selecting parameters of the vibration isolation gasket according to the vibration excitation frequency omega of the structural vibration of the rotating machinery equipment of the thermal power plant, so that the vibration isolation rate gamma of the vibration isolation gasket is maximized;
for a certain thermal power plant rotary mechanical device, the thickness h, the area s or the material (including the elastic modulus E and the damping ratio zeta) of the vibration isolation gasket is optimized, so that the vibration isolation gasket can bear the gravity of the thermal power plant rotary mechanical device.
The specific process of the step 4) is as follows:
41) calculating the natural frequency omega of the vibration absorber mode of the corrugated joint as follows:
wherein K is rigidity, m is mass, N is corrugation pitch number, C is flexibility coefficient, E is elastic modulus, I is section inertia distance, and l, d and r are structural parameters of the corrugated pipe.
42) Exciting frequency omega according to structural vibration of rotating mechanical equipment of thermal power plant0Selecting structural parameters of the corrugated joint to ensure that the natural frequency of the vibration absorber mode of the corrugated joint is equal to the excitation frequency of the structural vibration of the rotating mechanical equipment of the thermal power plant (namely omega-omega)0) So as to realize the maximum vibration absorption effect.
43) For a certain rotary mechanical device of a thermal power plant, the external dimension of the corrugated pipe is matched with the diameter of an inlet pipeline and an outlet pipeline, and the corrugated pipe can bear the fluid excitation force by optimizing the corrugated node number N and the material or thickness of the corrugated pipe.
The specific operation of the step 5) is as follows:
51) the support is arranged at the most severe resonance part of the bearing seat, the inner diameter 7 of the rotor groove 8 is larger than the outer diameter of the rotor, the inner diameter 7 of the retainer ring 5 conforms to the outer diameter of the bearing seat, and the central angle alpha is 90-180 degrees so as to ensure that the vertical plate 3 can effectively increase the rigidity of the bearing seat in the vertical direction and ensure that the retainer ring 5 can effectively increase the rigidity of the bearing seat in the horizontal direction.
52) According to the actual situation on site, the rooting method for determining the supporting device comprises the following steps: the base plate 1 is fixed on a foundation by adopting expansion bolts 2, or the base plate 1 is directly welded on an equipment frame or a bedplate, or is welded with a steel bar in the foundation or is poured by cement.
53) And the support device is fixedly connected with a bearing seat of the rotary mechanical equipment of the thermal power plant by utilizing a positioning bolt 4 or a pre-tightening bolt 6, wherein the positioning bolt 4 can adopt a connecting bolt of an end cover of the bearing seat to connect the vertical plate 3 with the bearing seat.
54) The bearing block is horizontally supported by means of horizontal support bolts 9 through threaded holes 10 on both sides of the collar 5.
55) A dial indicator is added on a bearing seat of the rotary mechanical equipment of the thermal power plant for monitoring so as to measure the left and right, up and down displacement of the bearing seat and ensure that the equipment is pre-stressed with a preset tightening force after the supporting device is fixed.
The specific process of frequency modulation processing of the component with structural resonance by adding particles or placing a heavy object is as follows:
61) adding particle damping materials on the equipment frame and the shell, for example, pressing a sand bag on the resonance component or filling steel ball particles in the circular tube steel of the basic frame;
62) according to the excitation frequency of the structural vibration of the rotating equipment, through a field test, selecting proper particle diameter, particle density and filling weight to realize the maximization of the vibration reduction effect;
63) with the increase of the particle diameter, the energy consumed in the process of mutual collision and friction of particles is increased, the vibration reduction effect is better, particularly under the excitation working condition of high frequency (>50Hz), the particle diameter has a particularly remarkable vibration reduction effect, however, when the particle diameter reaches 1mm, the increase of the particles has no remarkable change on the vibration reduction effect;
64) selecting a filling rate of 80%, adding a heavier filler in the pore cavity, ensuring that the movement of particles in the pore cavity is not limited, and consuming energy through collision and friction to improve the vibration reduction effect of the system;
meanwhile, particles with higher density are selected as much as possible, more energy is consumed by utilizing collision and friction as much as possible, and the vibration reduction effect of the system is improved; in addition, aiming at the resonance of a large-scale foundation platform, the mass of the vibration can be increased through a ballast, such as a heavy casting, so that the vibration reduction effect is achieved.
Example one
The comprehensive test is carried out on the rotating equipment of a certain 2 x 600MW thermal power plant, and the list of the obtained three-level vibration early warning equipment is shown in Table 3.
1) Aiming at the structural resonance problem of the free end bearing of the 2A water supply pump, as shown in figure 4, the vibration reduction supporting technology is adopted on site, so that the vibration of the bearing at the free end is greatly reduced, and as shown in figure 5, the bearing reaches the vibration qualified level (<7.1 mm/s).
2) To No. 1 generator hydrogen cooler vibration problem, through adjustment cooling water flow, under the condition that reduces condenser tube vibration by a wide margin, hydrogen cooler vibration also is showing and is reducing. The bellows vibration absorption technique is used in the field, as shown in fig. 6 and 7, so that the vibration is reduced to 4 mm/s.
3) Aiming at the problem of vibration of a driving motor of a 2B condensate pump, when the tightening force of a connecting bolt of the motor and a rack is adjusted on site, the larger the tightening force is, the larger the vibration is, and when the motor is completely loosened, the vibration of the motor is basically in a qualified level (<4.5 mm/s). A 0.80mm thick pvc material pad was used between the motor and the frame on site as shown in figure 8 and the bolts were tightened and the vibration was found to be reduced to around 4 mm/s.
4) Aiming at the problem of tile vibration of a No. 2 generator, field tests show that the platform at the excitation end of the generator vibrates very severely, the maximum vibration reaches about 150 microns, except that individual loose tiles show clutter vibration, the frequency spectrum of the platform vibration mainly shows frequency doubling vibration (50Hz), and the frequency doubling vibration (100Hz) of partial measuring points is also obvious, as shown in figure 9; along the axial direction, the platform vibration phase changes by about 180 degrees. After about 4 tons of castings and steel balls are placed at the most severe vibration position on the spot, as shown in fig. 10, the vibration of the excitation end of the generator is greatly reduced to about 5.8mm/s, and the vibration does not fluctuate greatly along with the change of the operation condition.
TABLE 3
Claims (9)
1. A method for processing structural vibration of rotating mechanical equipment in a thermal power plant is characterized by comprising the following steps:
performing vibration test and evaluation on the rotating mechanical equipment of the thermal power plant;
analyzing the structural vibration reason of the rotating mechanical equipment of the thermal power plant;
when the structural vibration is caused by coupling resonance between components of the rotary mechanical equipment of the thermal power plant, decoupling processing is carried out on the components with the coupling resonance by adopting a vibration isolation gasket technology;
when the structural vibration is caused by the structural vibration of the rotary mechanical equipment of the thermal power plant under the action of the pipeline, the vibration transmission of the pipeline is blocked by adopting the corrugated joint vibration absorption technology;
when structural vibration is caused by structural resonance of parts of the rotating mechanical equipment of the thermal power plant, the vibration reduction supporting technology is adopted to perform frequency modulation processing on the parts with the structural resonance, the parts with the structural resonance are subjected to frequency modulation processing by adding particles, or the foundation or the platform with the structural resonance is subjected to frequency modulation processing by placing a heavy object.
2. The method for processing the structural vibration of the rotating mechanical equipment of the thermal power plant according to claim 1, wherein the specific process of vibration testing and evaluation of the rotating mechanical equipment of the thermal power plant comprises the following steps:
11) marking vibration measurement positions in three directions on a bearing seat of rotary mechanical equipment of a thermal power plant;
12) in the vibration measurement position, the rotary mechanical equipment of the thermal power plant is subjected to vibration test, the vibration condition is evaluated according to a preset vibration limit value, and meanwhile, the vibration of the rotary mechanical equipment of the thermal power plant is classified according to the early warning level by combining the importance degree of the equipment, so that a fault equipment list is formed.
3. The method for processing the structural vibration of the rotating mechanical equipment of the thermal power plant according to claim 1, wherein the vibration of each component in the rotating mechanical equipment of the thermal power plant before and after connection is contrasted and analyzed, and when the amplitude of the vibration before and after connection exceeds 100%, the vibration source of the rotating mechanical equipment of the thermal power plant is determined to be the coupling resonance caused by the loaded motor, and the vibration isolation gasket technology is adopted to decouple the component with the coupling resonance.
4. The method for processing the structural vibration of the rotary mechanical equipment of the thermal power plant according to claim 1, wherein a flow test is performed on an inlet pipe and an outlet pipe of the rotary mechanical equipment of the thermal power plant, and when the vibration amplitude difference under each flow working condition exceeds 100% and the structural vibration of the rotary mechanical equipment of the thermal power plant is qualified under a certain flow working condition, the structural vibration is considered to be caused by the excitation of fluid in the inlet pipe and the outlet pipe, and then the vibration transmission of the pipes is blocked by adopting a corrugated joint vibration absorption technology.
5. The method for processing the structural vibration of the rotating mechanical equipment in the thermal power plant according to claim 3, wherein the vibration isolation rate γ of the vibration isolation gasket is:
wherein, omega is the excitation frequency, m is the mass of the rotating machinery equipment of the thermal power plant, h is the thickness of the vibration isolation gasket, s is the area of the vibration isolation gasket, E is the elastic modulus of the vibration isolation gasket, and zeta is the damping ratio of the vibration isolation gasket.
6. The method for processing the structural vibration of the rotary mechanical equipment in the thermal power plant according to claim 4, wherein the specific process of blocking the vibration transmission of the pipeline by adopting the corrugated joint vibration absorption technology comprises the following steps:
41) calculating the natural frequency omega of the vibration absorber mode of the corrugated joint as follows:
wherein K is rigidity, m is mass, N is corrugation pitch number, C is flexibility coefficient, E is elastic modulus, I is section inertia distance, and l, d and r are structural parameters of the corrugated pipe;
42) exciting frequency omega according to structural vibration of rotating mechanical equipment of thermal power plant0And selecting structural parameters of the corrugated joint, so that the modal natural frequency of the vibration absorber of the corrugated joint is equal to the excitation frequency of the structural vibration of the rotary mechanical equipment of the thermal power plant, simultaneously the overall dimension of the corrugated pipe is matched with the diameter of an inlet and outlet pipeline of the rotary mechanical equipment of the thermal power plant, and the corrugated pipe can bear the fluid excitation force by optimizing the number N, the material and the thickness of the corrugated joint of the corrugated pipe.
7. The method for processing the structural vibration of the rotating mechanical equipment in the thermal power plant according to claim 1, wherein the specific process of performing frequency modulation processing on the component with structural resonance by adopting the vibration damping support technology comprises the following steps: a supporting device is arranged and comprises a vertical plate (3), a bottom plate (1), an expansion bolt (2), a positioning bolt (4), a clamping ring (5), a pre-tightening bolt (6), an inner diameter (7), a rotor groove (8) and a horizontal supporting bolt (9), wherein the vertical plate (3) is fixed on the bottom plate (1), the bottom plate (1) is fixed on the base through the expansion bolt (2), the bottom of the clamping ring (5) is fixed on the top of the vertical plate (3), the top opening of the clamping ring (5) is connected through the pretightening bolt (6), the top of the vertical plate (3) is provided with a rotor groove (8), when the clamping ring is used, the clamping ring (5) is sleeved on a bearing seat of the rotary mechanical equipment of the thermal power plant, the horizontal supporting bolt (9) penetrates through a threaded hole (10) in the clamping ring (5) to be in contact with the bearing seat, and the positioning bolt (4) penetrates through the vertical plate (3) to be fixedly connected with the bearing seat of the rotary mechanical equipment of the thermal power plant.
8. The method for processing the structural vibration of the rotating mechanical equipment in the thermal power plant according to claim 1, wherein the specific process of performing the frequency modulation processing on the component with the structural resonance by adding the particulate matters comprises the following steps:
determining the diameter, density and filling weight of the particles according to the vibration excitation frequency of the structural vibration of the rotating mechanical equipment of the thermal power plant;
and selecting the particles according to the determined diameter, density and filling weight of the particles, and filling the particles on the equipment frame or the shell.
9. The method for handling structural vibrations of rotating mechanical equipment of a thermal power plant as recited in claim 1, wherein said weight is a heavy casting.
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Application publication date: 20210924 |