CN-122016194-A - High-pressure slurry valve internal leakage diagnosis method

CN122016194ACN 122016194 ACN122016194 ACN 122016194ACN-122016194-A

Abstract

The invention relates to the technical field of industrial equipment operation state sensing and safety monitoring, in particular to a high-pressure slurry valve internal leakage diagnosis method, which aims at the problem that the internal leakage state of a high-pressure slurry valve is difficult to identify in an early stage under a complex working condition, acquires recovery behavior data after disturbance relief by applying modulation disturbance to the valve operation working condition, builds a sealing self-adaptive reference behavior model, extracts a recovery behavior parameter set representing the valve sealing regulation behavior, acquires a behavior offset of the current operation state of the valve relative to the reference state based on a behavior consistency analysis method, and judges whether the high-pressure slurry valve is in an internal leakage correlation state or not through analysis of behavior offset evolution characteristics.

Inventors

ZHAO DONGDONG
ZHAO GUOHUA
GAO QINGQIAN
SONG HAO
WANG HUANYU

Assignees

河南盛誉实业有限公司

Dates

Publication Date: 20260512
Application Date: 20260109

Claims (10)

1. The method for diagnosing the leakage in the high-pressure slurry valve is characterized by comprising the following steps of: The method comprises the steps of firstly, applying operation modulation disturbance for causing redistribution of valve sealing interface medium particles to a high-pressure slurry valve in a no-internal leakage confirmation state by adopting an operation condition modulation method, collecting system operation parameters before and after the operation disturbance action to obtain first recovery behavior data representing a process that the valve enters a stable state after disturbance is relieved, and constructing a sealing self-adaptive reference behavior model based on the first recovery behavior data; Step two, applying corresponding operation disturbance to the high-pressure slurry valve in an on-line operation state by adopting an operation condition modulation method which is the same as or equivalent to that in the step one, and collecting system operation parameters after the operation disturbance is relieved to obtain second recovery behavior data of the valve in the current operation state; Thirdly, performing time scale unified processing on the first recovery behavior data and the second recovery behavior data, and extracting a recovery behavior parameter set reflecting the characteristic of a recovery path of the valve after disturbance based on the processed data, wherein the recovery behavior parameter set is used for representing the regulating behavior of a valve sealing structure on the current operation disturbance; Comparing the recovery behavior parameter set with the seal self-adaptive reference behavior model by adopting a behavior consistency analysis method to obtain the behavior offset of the current running state of the valve relative to the reference state; And fifthly, judging the sealing self-adaptive state of the high-pressure slurry valve based on the change characteristics of the behavior offset, and determining that the high-pressure slurry valve is in an internal leakage association state when the behavior offset meets a preset evolution condition.
2. The method for diagnosing the leakage in the high-pressure slurry valve according to claim 1, wherein the operation condition modulation method comprises the steps of applying periodic micro-displacement control to a valve core of the high-pressure slurry valve relative to a valve seat, wherein the micro-displacement control range is within a displacement interval without changing the on-off state of the valve, maintaining a preset holding time period after each micro-displacement control is finished, and inducing slurry particles at a sealing surface of the valve seat to be rearranged in a contact area.
3. The method for diagnosing the internal leakage of the high-pressure slurry valve according to claim 1, wherein the first recovery behavior data is composed of a pre-valve pressure change sequence, a post-valve pressure change sequence and a valve position feedback change sequence which are continuously collected after operation modulation disturbance is relieved, the first recovery behavior data is divided into at least one unsteady recovery section and one steady-state approach section according to the evolution characteristics of system operation parameters by taking disturbance relieving moments as unified time reference points, so as to construct a seal adaptive reference behavior model for describing the staged recovery behavior of a valve seal interface in the particle redistribution process, and the seal adaptive reference behavior model comprises a stage sequence relation constraint for limiting the occurrence sequence of each recovery section, a stage engagement constraint for limiting the evolution continuity of adjacent recovery sections and a stability constraint for limiting the fluctuation range of system parameters in the steady-state approach section.
4. The method for diagnosing internal leakage of a high pressure slurry valve according to claim 1, wherein said second recovery action data acquisition comprises: Judging the current operation stability of the valve based on a valve position feedback signal when the high-pressure slurry valve is in a continuous feeding operation state, and triggering the operation condition modulation corresponding to the first step when the valve position feedback variation amplitude is in a preset allowable interval; after the operation condition modulation is released, synchronously acquiring upstream pressure, downstream pressure and valve position feedback signals of a valve; Section screening is carried out on the acquired data, and data sections with parameters which are non-monotonically changed before the modulation and the disturbance are released in the operating condition are removed; The data section which satisfies the monotonic recovery characteristic and the duration of which exceeds the preset minimum observation period is configured as second recovery behavior data in the current operating state of the valve.
5. The method for diagnosing internal leakage of a high pressure slurry valve according to claim 1, wherein said performing a time-scale unified process on the first recovery action data and the second recovery action data comprises: respectively determining the recovery process from the moment of canceling the operation disturbance to the moment of entering a stable state judgment section of the valve in the first recovery behavior data and the second recovery behavior data; at least one of the upstream pressure data of the valve, the downstream pressure data of the valve and the valve position feedback data is selected as a recovery process characterization quantity; based on the change rate of the recovery process characterization quantity in the recovery process, nonlinear reconstruction is carried out on a physical time axis to obtain an equivalent recovery process time axis, and a reconstruction expression is as follows: Wherein, the Indicating the operation disturbance release time; indicating the moment when the system operation parameters enter a steady state judgment section; representing any physical time sampling point in the recovery process; Representing an integral variable; is shown at the moment The collected system operation parameters are at least one of upstream pressure, downstream pressure or valve position feedback quantity of the valve; An amplitude representing the instantaneous rate of change of the system operating parameter during recovery; Representing normalized equivalent recovery process time variable with a value range of The method is used for representing the evolution progress of valve disturbance recovery at the seal regulation behavior level; On the equivalent recovery process time axis, uniformly resampling the first recovery behavior data and the second recovery behavior data; And extracting a recovery behavior parameter set of the second recovery behavior data based on the resampled recovery path, wherein the recovery behavior parameter set at least comprises a recovery process slope distribution parameter, a recovery path curvature parameter and a stable region precursor evolution length parameter.
6. The method for diagnosing internal leakage of a high pressure slurry valve according to claim 1, wherein said comparing the second set of recovery behavior parameters with the seal adaptive reference behavior model using a behavior consistency analysis method comprises: numbering each recovery behavior parameter in the recovery behavior parameter set according to the appearance sequence of the recovery behavior parameter in the equivalent recovery process time axis based on the sealed self-adaptive reference behavior model, and constructing a reference recovery behavior sequence; Counting the change direction, the change amplitude interval and the evolution interval between adjacent recovery behavior parameters in the reference recovery behavior sequence to generate a parameter association matrix representing the intrinsic constraint relation of the recovery behavior in a reference state; based on the recovery behavior parameter set, constructing an actual recovery behavior sequence in the current running state according to the same numbering rule, and generating a corresponding actual parameter association matrix; item-by-item comparison is carried out on the actual parameter incidence matrix and the reference parameter incidence matrix, and incidence items which violate the change direction constraint, the amplitude interval constraint or the evolution interval constraint are identified; And quantitatively characterizing the behavior offset of the current running state of the valve relative to the reference state based on the distribution density and the offset magnitude of the violation association on the equivalent recovery process time axis.
7. The method for diagnosing internal leakage of a high pressure slurry valve according to claim 6, wherein said constructing of said parameter correlation matrix comprises: On the equivalent recovery process time axis, aiming at any two adjacent recovery behavior parameters And (3) with Respectively calculating a monotonic change direction identifier, an accumulated change amplitude ratio and an equivalent process interval in a recovery process interval, wherein the monotonic change direction identifier is determined by a first-order change symbol of a recovery behavior parameter in a corresponding recovery process interval, and a calculation formula of the equivalent process interval is that The calculation formula of the cumulative change amplitude ratio is as follows: Wherein, the Respectively represent the first And the first and second The parameters of the behavior of the recovery are set, For the position of the corresponding parameter on the equivalent recovery process time axis, Cumulative change amplitude scale index of adjacent recovery behavior parameters; And filling the monotonic change direction identifier, the cumulative change amplitude ratio and the equivalent process interval serving as associated elements into corresponding parameter associated matrix units for representing the structural constraint relation between adjacent behavior parameters in the high-pressure slurry valve sealing recovery process.
8. The method for diagnosing an internal leakage of a high pressure slurry valve as set forth in claim 6 wherein said quantitative characterization of said behavioral shift comprises: dividing the complete recovery process into a plurality of continuous process subintervals on an equivalent recovery process time axis; for each process subinterval, calculating the interval variation of each recovery behavior parameter in the reference recovery behavior parameter set in the subinterval, and taking the sign of the interval variation as a reference variation direction mark of the corresponding recovery behavior parameter; Aiming at a second recovery behavior parameter set in the current running state, calculating the interval variation of the corresponding recovery behavior parameter in each process subinterval by adopting the same process subinterval division mode, and taking the sign of the interval variation as an actual variation direction mark; When the actual change direction identification of the same recovery behavior parameter in the same process subinterval is inconsistent with the reference change direction identification, judging that the recovery behavior parameter is deviated in direction in the process subinterval; In each process subinterval, counting the quantity of recovery behavior parameters with direction deviation, and defining the ratio of the quantity to the total quantity of the recovery behavior parameters participating in counting in the subinterval as the direction deviation density of the process subinterval; Based on the position sequence of each process subinterval on the equivalent recovery process time axis, introducing a position weight function The deviation density of each direction is weighted and accumulated to obtain the behavior offset of the current running state of the valve relative to the reference state The expression is: Wherein, the Representing the number of association terms violating the structure constraint relationship; Represent the first The change direction of each associated item deviates from the mark; respectively representing the ratio of the cumulative change amplitude values in the current state and the reference state; Respectively representing equivalent process intervals in the current state and the reference state; For balancing the weight coefficient of different deflection contribution degree, the position weight function The method is used for reducing the contribution of the violation association in the early stage of recovery to the behavior offset and enhancing the contribution of the violation association in the later stage of recovery to the behavior offset.
9. The method for diagnosing internal leakage of a high pressure slurry valve according to claim 1, wherein said determining a seal adaptation state of the high pressure slurry valve based on a variation characteristic of the behavior shift amount comprises: in the continuous multi-time operation condition modulation process, a corresponding behavior offset sequence is obtained Wherein Represent the first A recovery process after the secondary operation disturbance; Calculating evolution increment between adjacent behavior offsets based on behavior offset sequences Constructing an evolution track of the behavior offset; carrying out segmentation consistency analysis on the evolution track, and identifying an evolution section in which the behavior offset simultaneously satisfies a monotonically increasing relation within a preset continuous disturbance frequency and the evolution increment does not fall back; And when the length of the evolution section exceeds the preset minimum evolution length and the behavior offset in the evolution section is not returned to the stable section corresponding to the sealing self-adaptive reference behavior model, judging that the high-pressure slurry valve is in an internal leakage correlation state.
10. The method for diagnosing internal leakage of a high pressure slurry valve according to claim 1, wherein the determination of the behavior shift change characteristic is performed by performing an irreversible evolution analysis on a behavior shift sequence, the irreversible evolution analysis comprising: For a sequence of behavior offsets obtained in succession Dividing the sections according to a preset sliding length, and respectively determining the initial behavior offset of each section Segment termination behavior offset And minimum behavior offset within a segment ; Based on the behavior offset distribution in the section, calculating the irreversible evolution discriminant corresponding to the section The calculation formula is as follows: Wherein, the Representing a behavior offset corresponding to the segment start disturbance; Representing a behavior offset corresponding to the segment termination disturbance; Representing a minimum behavioral offset occurring within the segment; When the irreversible evolution discriminant And when the behavior deviation in the corresponding section is not returned to the allowable return interval defined by the seal self-adaptive reference behavior model, judging that the behavior deviation change characteristic presents irreversible evolution characteristic.

Description

High-pressure slurry valve internal leakage diagnosis method Technical Field The invention relates to the technical field of industrial equipment running state sensing and safety monitoring, in particular to a high-pressure slurry valve internal leakage diagnosis method. Background The high-pressure slurry valve is widely applied to high-pressure working conditions such as slurry conveying, chemical reaction, energy sources and the like, has strong concealment of internal leakage faults, is easy to cause medium loss and equipment damage, and needs a reliable online diagnosis method. The related art generally collects operation parameters such as acoustic signals, vibration signals, temperature signals, pressure, flow and the like of a valve or a pipeline, and extracts key indexes reflecting leakage characteristics through signal processing and model analysis. For example, CN116222905A collects the acoustic signals in the valve operation process in real time by arranging acoustic signal sensors at the upstream and downstream of the valve, and recognizes the valve internal leakage state by using an algorithm model, so as to realize the on-line detection and quantitative analysis of the valve internal leakage. For another example, CN118817189B combines the acoustic signal, the fluid feature data and the valve flaw detection data, and analyzes the valve leak feature based on the joint detection algorithm, so as to generate the valve leak alarm information. According to the method, through analytical modeling of the multi-source signals, the identification of the internal leakage of the valve can be realized under a certain working condition, but the technical foundation is generally established on the premise that the internal leakage process of the valve can form relatively stable and sustainable characterization characteristics on the signal level of acoustics, vibration or heat and the like. In the existing method, in the process of model construction and feature extraction, energy release or parameter change corresponding to default endoleak behavior is generally statistically stable, so that the energy release or parameter change can be identified through threshold judgment, pattern matching or similarity calculation. However, in the actual operating environment of a high pressure slurry valve, the medium is usually a high-concentration, multiphase slurry, and the internal leakage process is often accompanied by repeated occurrence of particle embedding, local blockage and instantaneous flushing, and the internal leakage channel presents obvious non-continuous and strong time-varying characteristics. Under this condition, it is difficult for the acoustic signal, vibration signal or temperature variation induced by internal leakage to maintain consistency on a time scale, and the relevant features exhibit a highly discrete and unrepeatable feature distribution in a statistical sense. Because the existing diagnosis method relies on the extraction and learning of the stable characteristic mode, when the internal leakage behavior does not have continuous and accumulative signal expression, the diagnosis model is difficult to form an effective judgment basis, so that the internal leakage state is difficult to accurately identify in an early stage, and the judgment and evaluation of the real running state of the high-pressure slurry valve are affected. Disclosure of Invention Aiming at the defects of the prior art, the invention discloses a high-pressure slurry valve internal leakage diagnosis method, which aims to realize prospective identification of the internal leakage correlation state of a high-pressure slurry valve and improve the reliability and engineering applicability of operation monitoring of the slurry valve. In order to achieve the technical effects, the invention adopts the following technical scheme: a method for diagnosing the leakage in a high-pressure slurry valve comprises the following steps: The method comprises the steps of firstly, applying operation modulation disturbance for causing redistribution of valve sealing interface medium particles to a high-pressure slurry valve in a no-internal leakage confirmation state by adopting an operation condition modulation method, collecting system operation parameters before and after the operation disturbance action to obtain first recovery behavior data representing a process that the valve enters a stable state after disturbance is relieved, and constructing a sealing self-adaptive reference behavior model based on the first recovery behavior data; Step two, applying corresponding operation disturbance to the high-pressure slurry valve in an on-line operation state by adopting an operation condition modulation method which is the same as or equivalent to that in the step one, and collecting system operation parameters after the operation disturbance is relieved to obtain second recovery behavior data of the valve in the current operation state;