CN113065670A - State overhaul working method for centrifugal ventilator of power plant - Google Patents
State overhaul working method for centrifugal ventilator of power plant Download PDFInfo
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Abstract
The invention discloses a state maintenance working method of a centrifugal fan of a power plant, which comprises the following steps: collecting information of the centrifugal fan; performing state diagnosis and analysis on the centrifugal fan; evaluating the state of the centrifugal fan; making a predictive maintenance suggestion of the centrifugal fan; making a maintenance strategy of the centrifugal fan; judging whether the maintenance is carried out or not, executing the next step when the judgment result is yes, and returning to the initial step when the judgment result is no; making a maintenance plan of the centrifugal fan; carrying out maintenance implementation on the centrifugal fan; evaluating and continuously improving the overhauled centrifugal fan; and analyzing the condition maintenance benefit of the centrifugal fan. The effect is as follows: the implementation state maintenance of the centrifugal fan is the concrete embodiment of the modernization, the innovation and the technical innovation of the equipment management of power generation enterprises, can effectively solve the problem of overhauled or overhauled equipment caused by the regular maintenance of the centrifugal fan, and improves the safety and the usability of the equipment.
Description
Technical Field
The invention relates to the technical field of power production maintenance in the power generation industry, in particular to a state maintenance working method of a centrifugal fan of a power plant, which is suitable for the state maintenance direction of the centrifugal fan (the centrifugal fan) of the power plant, and specifically relates to a state maintenance working process and a state maintenance working method of the centrifugal fan.
Background
Problems existing in the conventional regular maintenance system of the power generation equipment are increasingly revealed, the maintenance cost of the power generation equipment is increased year by year, and the profit is reduced year by year; most power generation enterprises are in a loss state, so that the overhaul and maintenance cost is greatly reduced, and the unit is in an embarrassing situation of under-overhaul and under-overhaul.
Because the traditional power generation equipment management mode mainly aims at scheduled maintenance (regular) maintenance, namely, maintenance modes based on a certain time interval or period are adopted, maintenance of a centrifugal fan above D level is arranged at least once every year, the fan is disassembled and inspected, and a bearing, lubricating oil, a vulnerable part and the like are replaced, so that various defects of overhaul, over-repair and the like exist, huge waste of human, financial and material resources is caused, especially sudden faults of fan equipment in operation cannot be effectively prevented, and predicted maintenance or timely maintenance cannot be performed.
In recent years, foreign power enterprises have vigorously tried to implement a condition maintenance mode, and through recent practice, the condition maintenance mode plays an important role in improving maintenance pertinence.
By the end of 2020, the installed domestic power generation capacity is nearly 20 hundred million kilowatts, the annual maintenance cost of power generation equipment is averagely 45 yuan/kilowatt, the total maintenance cost is up to about 900 hundred million, and the power generation equipment continuously stays high for many years, so that individual enterprises cannot perform 'repair is required and repair is required', some enterprises do not repair and repair is damaged, and the situation is caused because the established maintenance items lack sufficient safety and economic evaluation, monitoring equipment is backward or imperfect, the health state of the equipment cannot be fully known, and factors such as economic maintenance and the like are not considered. In a word, an advanced, mature and feasible equipment state maintenance process and method system are urgently needed by power generation enterprises, and a decision and support are provided for maintenance optimization of equipment.
Disclosure of Invention
Therefore, the invention provides a working method for state maintenance of a centrifugal fan of a power plant, which aims to solve the problems in the prior art.
In order to achieve the above purpose, the invention provides the following technical scheme:
according to a first aspect of the invention, a method for condition maintenance work of a centrifugal fan of a power plant comprises the following steps:
s100, collecting information of the centrifugal fan;
s150, performing state diagnosis and analysis on the centrifugal fan;
s200, evaluating the state of the centrifugal fan;
s250, making a predictive overhaul suggestion of the centrifugal fan;
s300, establishing a maintenance strategy of the centrifugal fan;
step S350, judging whether to overhaul, executing step S400 when the judgment result is yes, and returning to the initial step S100 when the judgment result is no;
s400, making a maintenance plan of the centrifugal fan;
s450, performing maintenance of the centrifugal fan;
s500, evaluating and continuously improving the overhauled centrifugal fan;
and S550, analyzing the state maintenance benefit of the centrifugal fan.
Further, the centrifugal fan information in step S100 refers to original information, operation information, and overhaul test information of the centrifugal fan.
Further, in step S150, a vibration, oil, infrared, ultrasonic and current monitoring method is specifically applied to perform equipment diagnosis and fault mode analysis and evaluation.
Further, the evaluation of the state of the centrifugal fan in step S200 specifically includes safety evaluation and economic evaluation.
Further, the four states for the device in step S250 specifically include a normal state, an attention state, an abnormal state, and a serious state.
Further, the predictive service recommendation is determined in step S250, and specifically includes a daily service recommendation, a periodic service recommendation, a degraded service recommendation, and a failed service recommendation.
Further, the centrifugal fan maintenance strategy in step S300 specifically includes a "normal state" maintenance strategy, an "attention state" maintenance strategy, an "abnormal state" maintenance strategy, and a "severe state" maintenance strategy.
Further, the step S500 specifically includes verifying a predictive overhaul recommendation, evaluating scientificity of an evaluation standard, rationality of an overhaul strategy, recovery and improvement of equipment performance, and the like, continuously perfecting the overhaul strategy, revising a related technical standard, and continuously improving a state overhaul management system.
Further, step S550 specifically includes canceling and extending the economic benefit of the overhaul period, canceling the economic benefit of the project, increasing the direct economic benefit of the project, and increasing the indirect economic benefit of the project.
The invention has the following advantages: the implementation state maintenance of the centrifugal fan is the concrete embodiment of the modernization, the innovation and the technical innovation of the equipment management of power generation enterprises, can effectively solve the problem of overhauled or overhauled equipment caused by the regular maintenance of the centrifugal fan, and improves the safety and the usability of the equipment.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
Fig. 1 is a flowchart of a method for performing a condition maintenance operation on a centrifugal fan of a power plant according to some embodiments of the present invention.
Fig. 2 is a typical configuration diagram of a centrifugal fan in the prior art.
In the figure: 1. casing, 2, impeller, 3, wheel hub, 4, fan shaft, 5, induction port, 6, gas vent, 7, bearing frame, 8, baffle, 9, shaft coupling, 10, bearing group, 11, motor shaft, 12, cooling device, 13, cooling fan, 14, stator, 15, rotor, 16, fan basis, 17, motor basis, 18, power supply unit, 19, control and frequency conversion device, 20, rag bolt, 21, platen, 22, telescopic connecting piece, 23, muffler, 24, current collector, 25, wind channel support.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. 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.
As shown in fig. 1 to 2, a method for performing a condition maintenance operation on a centrifugal fan of a power plant according to an embodiment of the first aspect of the present invention includes the steps of: s100, collecting information of the centrifugal fan; s150, performing state diagnosis and analysis on the centrifugal fan; s200, evaluating the state of the centrifugal fan; s250, making a predictive overhaul suggestion of the centrifugal fan; s300, establishing a maintenance strategy of the centrifugal fan; step S350, judging whether to overhaul, executing step S400 when the judgment result is yes, and returning to the initial step S100 when the judgment result is no; s400, making a maintenance plan of the centrifugal fan; s450, performing maintenance of the centrifugal fan; s500, evaluating and continuously improving the overhauled centrifugal fan; and S550, analyzing the state maintenance benefit of the centrifugal fan.
In the above embodiments, it should be noted that the centrifugal fan is the most common and frequently used equipment in a power plant, and the blower, the induced draft fan, the primary fan and the like of the boiler auxiliary equipment are also very important key equipment, and the failure rate is high, the maintenance is frequent, and the current regular maintenance mode is not suitable for the development requirement of power production in a new form. In order to solve the problems of the conventional periodic maintenance system of the centrifugal fan, the invention provides a process and a method system for maintaining the state of the centrifugal fan.
A typical structure of the centrifugal fan is shown in fig. 2, and specifically includes: the device comprises a machine shell 1, an impeller 2, a hub 3, a fan shaft 4, an air suction opening 5, an air exhaust opening 6, a bearing seat 7, a baffle plate 8, a coupling 9, a bearing group 10, a motor 11, a shaft cooling device 12, a cooling fan 13, a stator 14, a rotor 15, a fan foundation 16, a motor foundation 17, a power supply device 18, a control and frequency conversion device 19, foundation bolts 20, a bedplate 21, a telescopic connecting piece 22, a silencer 23, a current collector 24 and an air duct support 25.
Firstly, classifying and collecting the state quantity information of the centrifugal fan.
1. Collecting information before commissioning of the centrifugal fan: the method mainly comprises paper and electronic version data information such as equipment nameplate parameters, design specifications, ordering technical protocols, equipment technical specifications, equipment monitoring and manufacturing reports, type test reports, delivery test reports, transportation records, arrival acceptance records, delivery test reports, installation acceptance records, installation and debugging reports, new (modified and expanded) construction engineering related drawings and the like.
2. Collecting operation information of the centrifugal fan: the system mainly comprises equipment operation attributes (such as equipment attribution, operation numbers and the like), real-time operation data and information, equipment inspection point inspection data and information, maintenance data and information, operation analysis data and information, fault data and information, defect and defect elimination data and information, start-stop data and information, various off-line detection data and information, on-line operation monitoring detection data, bad (abnormal) working conditions and other information.
3. Collecting information such as maintenance tests of the centrifugal fan: the method mainly comprises an examination test report, a performance test report (before repair and after repair test reports), a diagnostic optimization adjustment test report, a defect and fault record, an overhaul report, a part replacement condition, an equipment shutdown inspection record, an equipment detection report, equipment technical transformation and other information.
4. Collecting other information of the centrifugal fan: the method mainly comprises the family defects of equipment defects or hidden danger information and the like of the same manufacturer, the same model and the same batch of equipment (including main components) caused by the same common factors such as design, material and process of a manufacturing plant, the information of related anti-accident measures, technical supervision conditions, rectification measures and the like.
And secondly, monitoring the state of the centrifugal fan and the standard.
The state monitoring of the centrifugal fan is based on an on-line monitoring system and an off-line monitoring method and other monitoring means. Each power generation enterprise can gradually perfect or configure necessary equipment offline and online state monitoring devices (instruments) and analysis early warning or state maintenance decision support systems according to actual needs. The selection of each monitoring device or system is based on the principle of maturity, reliability, economy and applicability, and the monitoring device or system with software is required to pay attention to the interchangeability of information and data such as the enterprise equipment maintenance management system and other analysis, early warning and decision support systems.
1. The centrifugal fan condition monitoring system comprises the following aspects. Centrifugal fan on-line monitoring device (system): the centrifugal fan on-line monitoring system recommends a decision support system (platform) with on-line synchronous acquisition, real-time display, early warning function and intelligent diagnosis. When a unit is newly built, an auxiliary machine online vibration monitoring analysis, diagnosis and early warning system is comprehensively configured in design. In-service centrifugal fans, on-line monitoring measuring points (such as vibration, temperature and the like) are incomplete, have a large difference with the requirements and standards for fully developing state maintenance, are gradually improved and configured by means of technical transformation and the like, and are synchronously built with an auxiliary machine state analysis early warning and state maintenance decision support system (platform); off-line monitoring device (system): the centrifugal fan off-line monitoring device (system) is an important complement of the on-line monitoring device (system) and is also a main auxiliary means for carrying out equipment state maintenance, and the common off-line state monitoring, analyzing and diagnosing device comprises: the device comprises a portable mechanical vibration analyzer, a portable infrared imager, an oil quality analyzer, an ultrasonic detector, a noise monitoring analyzer, a stroboscope, a laser thickness gauge and the like. Each power generation enterprise can be pertinently and selectively configured and perfected step by step according to the requirements; and recommending that various power generation enterprises actively adopt informatization means such as big data, artificial intelligence, industrial Internet and the like and new monitoring technology, and improving the state maintenance work level.
2. And (5) monitoring the state of the centrifugal fan. The vibration, temperature, lubricant quality and ultrasound of the centrifugal fan, which are commonly described as states, are taken as parameters, but the parameters are not limited to the above.
Evaluation standard of vibration limit value of centrifugal fan bearing: the severity of the fan vibration is often measured as the effective value of speed (RMS or root mean square), i.e., the vibration severity. Vibration severity part 1 of the vibration of the machine was evaluated as measured on a non-rotating part according to "GB/T6075.1 mechanical vibration: there are two criteria described in the general rules. The first criterion takes into account the magnitude of the broadband vibration and the second criterion takes into account the variation of the magnitude of the vibration. Both can be used as fan vibration magnitude judgment standards: the vibration magnitude determination is usually measured by a large broadband speed value measured by vibration sensors arranged in the horizontal direction, the vertical direction and the axial direction of a fan bearing seat; and evaluating and judging the vibration limit value of the fan, and acquiring the vibration value according to the installation mode of the vibration sensor, the measurement position and the acquisition parameter requirements.
In operation, the fan vibration is generally evaluated qualitatively according to the following evaluation areas, see table 1.
Table 1 vibration limit reference standard.
In the above table: and (3) area A: the vibration values of the newly delivered machine are generally in this area; and a region B: machine vibration in this region can often operate for long periods of time; and (3) area C: the machine vibration is in the area, the long-time continuous operation is generally not suitable, and the machine can be operated in the state for a short time until effective measures are taken or the fault is eliminated; and (3) area D: machine vibration in this area is generally considered to be of sufficient intensity to cause damage to the machine.
The evaluation standard of the temperature limit value of the centrifugal fan bearing is as follows: the centrifugal fan bearing temperature evaluation standard is preferably executed according to the standard provided by manufacturers or operation manuals. If the manufacturer does not specify the bearing temperature evaluation criteria (limits), the normal and dangerous limit criteria for the centrifugal fan bearing temperature can be implemented with reference to Table 2.
Table 2, bearing temperature evaluation limit reference standard.
The temperature rise speed of the centrifugal fan bearing and an evaluation reference standard are as follows: the temperature rise speed of the centrifugal fan is strictly not unified, but is an important parameter and index of the operation condition of the reaction equipment, and according to the conventional experience, when the auxiliary machine is started for trial operation after maintenance, the fastest temperature rise speed is close to but not more than 1 ℃/min, as shown in the following table 3. Therefore, the determined temperature rise rate criteria and calculation method are: every 3 minutes a temperature rise rate was calculated, (time-off temperature-time-on temperature)/time span (3 minutes).
Table 3, bearing temperature rise rate evaluation.
Centrifugal fan bearing lubricating oil quality evaluation standard: the quality analysis of the lubricating oil of the centrifugal fan bearing at least comprises the conventional analysis of the quality of the oil and the analysis of particles in the oil. The analysis of the particles in the oil can determine the wear stage of the equipment by the total amount of the particles, the wear part by the chemical composition, the wear severity by the size distribution and the wear type by the particle morphology. The oil particle analysis instrument is provided with a particle counter, an iron spectrometer and the like, and is combined with the oil analysis instrument and an outsourcing analysis project to develop an oil analysis project.
(a) The particle counter meets the requirements of off-line and on-line monitoring, and the monitoring result meets the standard requirements of ISO 4406, NAS1638 and the like.
(b) The ferrograph can be a direct-reading ferrograph or an analytical ferrograph.
(c) The conventional analysis of oil quality mainly refers to the analysis and detection of the conventional performance of oil, including the appearance, kinematic viscosity, moisture, flash point, acid value, liquid-phase corrosion and the like of oil. The blower, the induced draft fan, the primary air fan and the like used in the boiler equipment of the power plant mainly use turbine oil and hydraulic oil, and the viscosity grades of different oil types are detailed in table 4.
Table 4, type of fan oil and viscosity grade.
(d) Oil standard reference DL/T290 for fan equipment; the standard and quality analysis of the turbine oil refers to the quality requirements of new turbine oil and operating oil respectively given in GB 11120, GB/T7596 and GB/T14541, and the principle that the oil product should follow in maintenance and management.
Ultrasonic evaluation standard of centrifugal fan bearing: imperfections in rotating machinery can generate extensive sound waves, including ultrasonic waves. The ultrasonic wave is a high-frequency signal emitted by the defective part of the rotating bearing equipment through friction collision and the like, is not easily influenced by the surrounding low-frequency environmental noise, and can be stored in various forms of audio frequency, waveform and numerical value. The ultrasonic analyzer is mainly applied to rotating mechanical bearing abrasion and the like.
Ultrasonic evaluation reference standard: according to the results of NASA (national aerospace administration), ultrasonic monitoring can provide early warning of bearing and gear failures at an early stage, and failure modes and limits have been established at various stages: 8dB above baseline indicates pre-failure or lack of lubrication; exceeding the baseline by 12dB indicates that various failure modes have begun; 16dB above baseline indicates a further fault development; exceeding the baseline by 25dB to 50dB indicates that the fault may enter a catastrophic order.
And thirdly, acquiring the state quantity of the centrifugal fan and quantifying the standard.
1. Acquiring the state quantity: the state quantity of the centrifugal fan can be acquired from information before commissioning, operation information, overhaul test information and other information of the equipment, and the acquisition mode comprises the following steps: on-line monitoring, off-line detection, itinerant inspection, test inspection, information obtained by technical supervision and the like. And obtaining and determining an initial value.
2. Degree of importance of state quantity: the importance degree of the state quantity is divided into four grades from light to heavy, see table 5, which is 1 grade, 2 grade, 3 grade and 4 grade, and the influence factors are 1, 2, 3 and 4, see the following table. Here, level 1 and level 2 correspond to general state quantities, and level 3 and level 4 correspond to important state quantities.
Table 5, classification of the degree of influence of the state quantity.
| Degree of importance | Level 1 | Stage 2 | Grade 3 | 4 stage |
| Influencing factor | 1 | 2 | 3 | 4 |
3. Degree of state amount degradation: the deterioration degree of the state quantity is divided into four grades from light to heavy, see table 6, i, ii, iii and iv, and the corresponding basic deduction values are 2, 4, 8 and 10, see table below.
Table 6, classification of the state amount deterioration degree.
| Degree of deterioration | Class I | Stage II | Class III | IV stage |
| Basic deduction value | 2 | 4 | 8 | 10 |
The deterioration degree of the quantitative state quantity can also be interval grade according to the size of the state quantity, and the basic deduction value is determined by adopting a linear interpolation method. The specific calculation method is as follows: given that the basic credit values of certain state quantities x0 and x1 are y0 and y1, respectively, and that when the state quantity is x between the two, the basic credit value y is calculated according to the formula (1), the calculation method is more accurate than the quantitative state quantity degradation degree credit method, and the calculation is recommended to be carried out by adopting a linear interpolation method in the implementation process.
Wherein, formula (1) is:
4. deduction of state quantity: according to the state quantity deduction rule, the deduction value of the state quantity is determined by the importance degree of the state quantity and the degradation degree of the state quantity, namely the deduction value of the state quantity is equal to the basic deduction value of the state quantity multiplied by an influence factor, and the formula (2) shows that the degradation degree of the state quantity is recommended to be in interval grade according to the size of the state quantity, the basic deduction value is calculated by adopting a linear interpolation method, and all the deduction values of the state quantity are used as a standard. Table 7 below.
Wherein, formula (2) is: the state variable is given by the base credit x the impact factor.
Table 7, state quantity deduction value calculation table.
And fourthly, evaluating the state of the centrifugal fan.
1. A method for evaluating the state of key parts and auxiliary systems (equipment) of a centrifugal fan comprises the following steps: the evaluation of the key components and the auxiliary systems (equipment) of the centrifugal fan needs to consider the single state quantity deduction and the total deduction conditions at the same time, the state evaluation deduction standard is shown in a table 8, and the specific execution and operation can refer to an annex P state evaluation and maintenance strategy of the key components and the auxiliary components of the centrifugal fan.
Table 8, each key component and attached system (device) evaluation deduction criteria.
2. Overall evaluation of the centrifugal fan: the overall evaluation of the centrifugal fan is to integrate the evaluation results of all the components. When all the component evaluations were in the normal state, the whole was evaluated as the normal state. When the state of any main component is abnormal, the overall evaluation is the most serious state; the overall evaluation is preferably carried out in a mode of combining dynamic evaluation and periodic evaluation, and a corresponding maintenance strategy is formulated according to the evaluation result. The state detection is carried out on the fan every week, and the equipment state information is analyzed and summarized; the evaluation is not less than once every quarter for key parts or parts which are easy to fail; the evaluation of the whole equipment of the fan is not less than once every year, and the evaluation is summarized and filed in a report form. The format of the centrifugal fan state evaluation report is shown in appendix L; besides conventional evaluation of fan components, a thermal state performance test is carried out on the fan if necessary according to the current fan evaluation result, and the overall performance state of the fan is judged by comparing and analyzing the fan operation efficiency, the load carrying capacity, the design value and the evaluation report in the past year. If the operating efficiency and the load carrying capacity of the fan show a trend of descending year by year, and the deviation of a fan efficiency design test value and an original design value is 10 percent or more, firstly checking the fit clearance assembly size between the impeller and the current collector, if no problem exists, checking the abrasion conditions of the impeller, the current collector, an air inlet box (including an inlet baffle door) and an outlet baffle door, and determining whether to replace or maintain the component by combining with an equipment evaluation state standard; when the monthly power consumption rate or the station power consumption rate continuously increases by 0.2 percent or more for 3 times in the running process of the fan, the fan is suggested to be subjected to state evaluation in time, the reason for increasing the power consumption is found out by deeply analyzing the running efficiency of the fan, an improvement suggestion in the running process is proposed, and a strategy is provided for predicting and maintaining the fan.
And fifthly, a centrifugal fan state maintenance strategy.
1. Basic principle: according to various key information fusion technologies, through means such as state evaluation and risk evaluation, maintenance decision is scientifically determined, so that low cost, high quality and high efficiency are achieved, and the reliability of equipment is improved. A maintenance strategy is formulated according to the evaluation result of the health state of the equipment; the state maintenance strategy comprises the formulation of an annual maintenance plan, test, maintenance without shutdown and the like. The maintenance strategy should be dynamically adjusted according to the evaluation result of the equipment state; the state maintenance strategy of the centrifugal fan system is to comprehensively drive the evaluation and evaluation results of the motor or the small-sized steam turbine system of the fan equipment to be reasonably and comprehensively implemented; the components in the centrifugal fan system which are evaluated as "abnormal conditions" must be timely or scheduled for maintenance or listed in the next maintenance schedule, eliminated during maintenance and restored to "normal conditions".
2. The state maintenance strategy of the centrifugal fan is as follows: the centrifugal fan system comprises a fan body and an auxiliary system (equipment), when any one of the fan body and the auxiliary system (equipment) is in an attention state, an abnormal state and a serious state, the current highest level is taken as the standard, and a corresponding maintenance strategy is formulated according to an equipment evaluation result, and is shown in a table 9.
Table 9, device system overhaul policy table.
| Device status | Normal state | Attention status | Abnormal state | Severe state |
| Maintenance strategy | 5.2.1 strips | 5.2.2 strips | 5.2.3 strips | 5.2.4 strips |
| Recommendation cycle | Normal cycle or prolonged by one year | Not greater than normal period | Timely arrangement | Arrange as soon as possible |
Maintenance strategy in normal state: centrifugal fans rated as "normal" can be scheduled for maintenance on a normal maintenance cycle or extended by one year, in conjunction with routine experimentation.
Attention to the maintenance strategy of the state: if the centrifugal fan evaluated as the attention state is judged to be in the attention state due to the deduction of the single state quantity, the maintenance is scheduled according to the actual situation. If the evaluation result is the attention state only by the total deduction of the plurality of state quantities, the evaluation can be executed according to the normal period, and necessary overhaul or test contents are added according to the actual condition of the equipment.
Maintenance strategy of abnormal state: and the centrifugal fan evaluated as the abnormal state is timely or randomly selected to arrange maintenance according to the evaluation result.
Maintenance strategy in severe condition: the centrifugal fan evaluated as "critical condition" was scheduled for maintenance as soon as possible based on the evaluation results.
And sixthly, the condition maintenance plan (suggestion) and content of the centrifugal fan.
1. Centrifugal fan condition maintenance schedule (recommendations): aiming at the centrifugal fan state evaluation conclusion, determining a predictive overhaul suggestion, comprising: daily overhaul suggestions, regular overhaul suggestions, deterioration overhaul suggestions and fault overhaul suggestions.
2. The state of the centrifugal fan is overhauled and overhauled: and (3) making main contents of maintenance work according to the equipment state, the evaluation result clothes and the maintenance suggestions: (a) equipment operation, maintenance measures and the like; (b) determining maintenance opportunity, maintenance level, maintenance items, maintenance process, maintenance construction period and the like; (c) determining whether technical transformation is required or not by combining the reliability state of the equipment, the energy efficiency level, the equipment supply resource and the like; (d) planned maintenance is preferably employed in the following cases: the equipment lacks effective on-line monitoring and off-line and other analysis and diagnosis means, such as rotating part blades, rotating shafts and the like; the equipment has definite life cycle, or the failure rule is in a comparative definite relation with time, such as normally used lubricating oil, sealing elements and the like; other conditions need to be checked and maintained regularly, such as auxiliary facilities of oil stations, smoke air ducts and the like; critical components that are at risk of catastrophic failure.
The condition maintenance of the fan body equipment is verified and evaluated according to the result after each maintenance, the condition criterion, the monitoring means, the frequency, the maintenance mode, the evaluation method and the maintenance decision are continuously perfected, the management system and the operation instruction are continuously revised, and the improvement is continuously carried out.
And seventhly, evaluating the overhaul effect of the equipment state.
The verification and evaluation work should be carried out after the centrifugal fan is overhauled. After the maintenance of the fan is finished, effect evaluation is carried out within one month after the fan is started, whether state maintenance work is necessary or not is evaluated, whether fault problems can be accurately judged and solved or not is judged, whether expected effects (method means, performance indexes, benefits and the like) are achieved or not is judged, and whether the running state of a fan system reaches a good level or not is judged.
1. And (3) benefit evaluation: the economic benefits brought by the state maintenance of the centrifugal fan can be divided into three types: the economic benefit of the project is eliminated, the direct economic benefit of the project is increased, and the indirect economic benefit of the project is increased. The centrifugal fan condition maintenance benefit calculation is shown in table 10.
Table 10, a condition overhaul profit calculation table.
2. And (3) verification and evaluation: and determining a maintenance strategy according to the state evaluation result of the centrifugal fan, verifying the previous predictive maintenance suggestions within one year after the maintenance is started, namely whether the suggestions are accurate, and revising and perfecting relevant contents and standards in the state evaluation and maintenance strategy of the key and accessory components of the centrifugal fan if the suggestions are accurate.
3. The continuous improvement comprises the following steps: for a high-power fan (the power of a motor is more than 1000kW), a condition is allowed, and the fan operation online dynamic monitoring device is recommended to be additionally installed, so that the fan operation state is mastered in real time. Combining online and offline monitoring data, when the output of the fan is insufficient, performing a fan thermal state test according to conditions, analyzing through test results, and providing a rectification suggestion; the choices and decisions about the condition maintenance of the equipment are not mature or perfect due to the conditions limited by the current technology, management and the like, and the choices and decisions are continuously improved and perfected on the basis of practical inspection. Meanwhile, with the application of a new technology and the further understanding of some fault mechanisms, the method can be timely and correctly adjusted according to the original state criterion, monitoring means, frequency, maintenance mode, evaluation (evaluation) method and standard, maintenance decision and the like; after each maintenance project is finished, state evaluation is carried out in time, and whether the adopted maintenance mode is proper, whether the detection technology and the detection frequency are reasonable, whether state analysis and diagnosis are correct, whether the predictive maintenance suggestion is correct, whether a related management system and an operation instruction book are feasible and the like are reviewed according to the problems and the maintenance results found in maintenance; implementing equipment condition maintenance is a dynamic, constantly improving, system project with closed-loop operational management. The condition maintenance work of the centrifugal fan should continuously increase the proportion of technical and economic management so as to improve the level of implementing the condition maintenance of the equipment.
The implementation effect of the embodiment is as follows: the condition maintenance of the power generation equipment is a maintenance mode which is based on safety, environment, benefit and the like by enterprises, and can realize safe and reliable operation of the fan and reasonable maintenance cost by carrying out equipment maintenance work through means such as condition monitoring and assessment, fault diagnosis, risk analysis, maintenance decision and the like on the centrifugal fan equipment. According to the result of comprehensive evaluation of the state of the fan equipment, risk factors and economic factors of each equipment are considered, the maintenance plan of the equipment is dynamically formulated, maintenance opportunities and contents are reasonably arranged, potential safety hazards in the equipment are timely discovered and eliminated at the minimum economic cost, the performance of the equipment is recovered as early as possible, the defects of overhaul, overhauling and the like caused by the existing fan maintenance mode are effectively overcome, huge money and resources are saved, sudden faults of the fan equipment in operation can be effectively prevented, and predicted maintenance or timely maintenance is achieved.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
In the present specification, the terms "upper", "lower", "left", "right", "middle", and the like are used for clarity of description, and are not intended to limit the scope of the present invention, and changes or modifications in the relative relationship may be made without substantial changes in the technical content.
Claims (9)
1. A condition maintenance working method for a centrifugal fan of a power plant is characterized by comprising the following steps:
s100, collecting information of the centrifugal fan;
s150, performing state diagnosis and analysis on the centrifugal fan;
s200, evaluating the state of the centrifugal fan;
s250, making a predictive overhaul suggestion of the centrifugal fan;
s300, establishing a maintenance strategy of the centrifugal fan;
step S350, judging whether to overhaul, executing step S400 when the judgment result is yes, and returning to the initial step S100 when the judgment result is no;
s400, making a maintenance plan of the centrifugal fan;
s450, performing maintenance of the centrifugal fan;
s500, evaluating and continuously improving the overhauled centrifugal fan;
and S550, analyzing the state maintenance benefit of the centrifugal fan.
2. The method for overhauling state of a centrifugal fan of a power plant as recited in claim 1, wherein the information of the centrifugal fan in the step S100 refers to original information, operation information and overhauling test information of the centrifugal fan.
3. The method of claim 1, wherein the vibration, oil, infrared, ultrasonic and current monitoring methods are applied to diagnose the equipment and analyze and evaluate the failure mode in step S150.
4. The method for the condition maintenance work of the centrifugal fan of the power plant according to claim 1, wherein the condition evaluation of the centrifugal fan in the step S200 specifically comprises safety evaluation and economic evaluation.
5. The method for overhauling the condition of the centrifugal fan of the power plant as recited in claim 1, wherein the four conditions of the equipment in the step S250 specifically comprise a normal condition, an attention condition, an abnormal condition and a serious condition.
6. The method for overhauling state of a centrifugal fan of a power plant as recited in claim 5, wherein the predictive overhauling advice is determined in step S250, and comprises daily overhauling advice, periodic overhauling advice, deterioration overhauling advice and fault overhauling advice.
7. The method of claim 1, wherein the centrifugal fan maintenance strategy in step S300 specifically includes a "normal state" maintenance strategy, an "attention state" maintenance strategy, an "abnormal state" maintenance strategy, and a "severe state" maintenance strategy.
8. The condition maintenance work method of the centrifugal fan of the power plant according to claim 1, characterized in that the step S500 further comprises verifying predictive maintenance suggestions, evaluating scientificity of evaluation criteria, rationality of maintenance strategies, recovery of equipment performance, improvement of equipment performance and the like, continuously perfecting the maintenance strategies, revising related technical standards, and continuously improving a condition maintenance management system.
9. The method of claim 1, wherein step S550 specifically includes eliminating and extending the economic benefit of the maintenance cycle, eliminating the economic benefit of the project, increasing the direct economic benefit of the project, and increasing the indirect economic benefit of the project.
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| Publication number | Priority date | Publication date | Assignee | Title |
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