CN117823406A - Screw pump energy efficiency evaluation method and system based on mud conveying amount - Google Patents
Screw pump energy efficiency evaluation method and system based on mud conveying amount Download PDFInfo
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- 238000011156 evaluation Methods 0.000 title claims abstract description 66
- 238000012544 monitoring process Methods 0.000 claims abstract description 132
- 238000000034 method Methods 0.000 claims abstract description 29
- 239000010802 sludge Substances 0.000 claims description 53
- 238000004364 calculation method Methods 0.000 claims description 34
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Abstract
The invention discloses a screw pump energy efficiency evaluation method and a screw pump energy efficiency evaluation system based on mud conveying amount, and relates to the technical field of sewage treatment, wherein the method comprises the following steps: acquiring a real-time monitoring signal of a screw pump to be monitored; determining an effective monitoring time period of energy efficiency evaluation of the screw pump according to the real-time monitoring signal; in the effective monitoring time period, calculating the theoretical mud conveying amount of the screw pump under the operating frequency according to the current, voltage, rotating speed-power and rotating speed-flow characteristic curves; in the effective monitoring time period, according to the real-time monitoring signal, measuring the mud conveying amount of the screw pump by using a volumetric method under the operating frequency to obtain the measured mud conveying amount; and (3) evaluating the energy efficiency of the screw pump in real time according to the ratio of the theoretical conveying mud amount to the corresponding measured conveying mud amount in the effective monitoring time period. The invention can improve the safety and reliability of the operation of the screw pump.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a screw pump energy efficiency evaluation method and system based on mud conveying amount.
Background
At present, most sewage treatment plants and sludge incineration plants estimate the sludge flow only by means of empirical formulas or measure the sludge flow by adopting flow meters such as ultrasonic waves. However, in practical application, due to the complex nature and high viscosity of the sludge and the large amount of solid particles and impurities, the substances may be accumulated on the flow sensor, so that the sensor is blocked, and the measurement result is affected. Meanwhile, the screw pump is easy to generate the conditions of rotor abrasion, sludge blockage and the like in the long-term operation process, so that the conveying capacity of the screw pump is reduced, and the service life of the pump is shortened.
Disclosure of Invention
The invention aims to provide a screw pump energy efficiency evaluation method and system based on mud conveying amount, which can improve the safety and reliability of screw pump operation.
In order to achieve the above object, the present invention provides the following solutions:
a screw pump energy efficiency evaluation method based on a conveying mud amount, the evaluation method comprising:
acquiring a real-time monitoring signal of a screw pump to be monitored; the monitoring signal is a first monitoring signal or a second monitoring signal; the first monitoring signals comprise time, an operation signal of the mud feeding screw pump, a target mud level, an inlet valve signal of a mud storage bin, an operation signal of the mud discharging screw pump, a mud level in the storage bin, an operation frequency, current and voltage; the second monitoring signal comprises a start monitoring signal, time, an operation signal of a mud feeding screw pump, an inlet valve signal of a mud storage bin, an operation signal of a mud discharging screw pump, a mud level in the storage bin, an operation frequency, current, voltage and target termination time;
determining an effective monitoring time period of energy efficiency evaluation of the screw pump to be monitored according to the real-time monitoring signal;
calculating theoretical conveying mud quantity of the screw pump to be monitored under the running frequency according to the current, the voltage, the rotating speed-power characteristic curve and the rotating speed-flow characteristic curve in the effective monitoring time period;
in the effective monitoring time period, according to the real-time monitoring signal, measuring the conveying mud quantity of the screw pump to be monitored by using a volumetric method under the operating frequency to obtain a measured conveying mud quantity;
and according to the ratio of the theoretical conveying mud amount to the corresponding measured conveying mud amount in the effective monitoring time period, carrying out real-time evaluation on the energy efficiency of the screw pump to be monitored.
Optionally, determining an effective monitoring time period for energy efficiency evaluation of the screw pump to be monitored according to the real-time monitoring signal specifically includes:
determining the starting time of an effective monitoring time period of energy efficiency evaluation of the screw pump to be monitored according to a starting monitoring signal; the start monitoring signal is a signal generated when the operation signal of the mud feeding screw pump is a closing signal, an inlet valve of a mud bin is a closing signal, and the operation signal of the mud discharging screw pump is an opening signal;
determining the termination time of the effective monitoring time period of the energy efficiency evaluation of the screw pump to be monitored according to the end monitoring signal; the end monitoring signal is a first end monitoring signal or a second end monitoring signal; the first end monitoring signal is a signal generated when the operation signal of the screw pump to be monitored is a closing signal, the operation frequency of the screw pump to be monitored changes, and the inlet valve signal of the sludge bin is a closing signal or reaches a target sludge level;
the second end monitoring signal is a signal generated when the operation signal of the screw pump to be monitored is a closing signal, the operation frequency of the screw pump to be monitored changes, and the inlet valve signal of the sludge bin is a closing signal or reaches the target end time.
Optionally, the calculation formula of the volumetric method is:
wherein Q is the measured conveying mud amount; LVL (Linear liquid crystal display) i For the mud level at the start time, LVL i+1 For the mud level at the end time, A is the bottom area of the bin, and Deltat is the measurement time.
Optionally, the evaluation method further comprises:
calculating the volumetric efficiency of the screw pump to be monitored at a plurality of frequencies;
acquiring historical average volumetric efficiency of the screw pump to be monitored at each frequency;
determining the state of the screw pump to be monitored according to the comparison result of the volumetric efficiency and the corresponding historical average volumetric efficiency; the conditions of the screw pump to be monitored include normal and failure.
Optionally, when the state of the screw pump to be monitored is a fault, an alarm signal is generated.
Optionally, the calculation formula of the volumetric efficiency is:
wherein eta v Is volume efficiency; q is the measured conveying mud amount; q (Q) t The mud amount is theoretically conveyed.
Screw pump energy efficiency evaluation system based on carry mud volume, the application of above-mentioned screw pump energy efficiency evaluation method based on carry mud volume, evaluation system includes:
the man-machine interaction module is used for acquiring a monitoring mode input by a user; the monitoring mode comprises a time monitoring mode and a mud level monitoring mode;
the data acquisition module is used for acquiring real-time monitoring signals of the screw pump;
the data storage module is respectively connected with the man-machine interaction module and the data acquisition module and is used for storing the monitoring mode and the real-time monitoring signal;
the calculation module is connected with the data storage module and used for calculating the theoretical conveying mud amount and the measured conveying mud amount according to the monitoring mode and the real-time monitoring signal, and evaluating the energy efficiency of the screw pump to be monitored according to the theoretical conveying mud amount and the measured conveying mud amount to obtain an evaluation result.
Optionally, the calculation module is further configured to send the theoretical delivered-sludge amount and the measured delivered-sludge amount to the data storage module, and send the evaluation result to the data storage module;
the data storage module is also used for storing the theoretical conveying mud amount, the measured conveying mud amount and the evaluation result.
Optionally, the calculation module is further configured to calculate volumetric efficiency of the screw pump to be monitored at a plurality of frequencies and historical average volumetric efficiency of the screw pump to be monitored at each frequency, and determine a state of the screw pump to be monitored according to a comparison result of the volumetric efficiency and the corresponding historical average volumetric efficiency; the conditions of the screw pump to be monitored include normal and failure.
Optionally, the calculation module is further configured to generate an alarm signal when the state of the screw pump to be monitored is a fault, and send the alarm signal to the data storage module;
the data storage module is also used for storing the alarm signal and sending the alarm signal to the man-machine interaction module;
and the man-machine interaction module is also used for displaying the alarm signal to the user.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a method and a system for evaluating the conveying capacity of a screw pump, which can calibrate the conveying capacity of a sludge screw pump automatically in real time, calculate the volumetric efficiency of the screw pump, judge whether the conveying capacity of the screw pump is reduced, judge whether the screw pump is blocked or not and the like, and further diagnose faults of the screw pump, realize online real-time monitoring and capacity evaluation of the screw pump in the running process, and ensure safe and reliable running of the screw pump.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a data acquisition module according to the present invention;
FIG. 2 is a schematic diagram of a data storage module according to the present invention;
FIG. 3 is a schematic diagram of a monitor and call module of the present invention;
FIG. 4 is a schematic diagram of a man-machine interaction module according to the present invention;
FIG. 5 is a graph of the speed versus flow characteristics of a screw pump according to the present invention using an interpolation algorithm;
FIG. 6 is a graph of the rotational speed versus power characteristics of a screw pump of the present invention using an interpolation algorithm;
FIG. 7 is a flow chart of a method for evaluating the energy efficiency of the screw pump based on the amount of mud delivered.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a screw pump energy efficiency evaluation method and system based on mud conveying amount, which can improve the safety and reliability of screw pump operation.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Example 1
As shown in fig. 7, the present invention provides a screw pump energy efficiency evaluation method based on a conveying mud amount, the evaluation method comprising:
step 1: acquiring a real-time monitoring signal of a screw pump to be monitored; the monitoring signal is a first monitoring signal or a second monitoring signal; the first monitoring signals comprise time, an operation signal of the mud feeding screw pump, a target mud level, an inlet valve signal of a mud storage bin, an operation signal of the mud discharging screw pump, a mud level in the storage bin, an operation frequency, current and voltage; the second monitoring signal comprises a start monitoring signal, time, an operation signal of the sludge feeding screw pump, an inlet valve signal of the sludge storage bin, an operation signal of the sludge discharging screw pump, a sludge level in the storage bin, an operation frequency, current, voltage and target termination time.
Step 2: and determining an effective monitoring time period for energy efficiency evaluation of the screw pump to be monitored according to the real-time monitoring signal.
As a specific embodiment, determining a starting time of an effective monitoring period of energy efficiency evaluation of the screw pump to be monitored according to a starting monitoring signal; the start monitoring signal is a signal generated when the operation signal of the mud feeding screw pump is a closing signal, the inlet valve of the sludge bin is a closing signal and the operation signal of the mud discharging screw pump is a closing signal. The screw pump to be monitored is a mud outlet screw pump; judging whether the operation signal of the mud discharging screw pump is a closing signal or not, wherein the screw pump to be monitored is not included, that is, when the energy efficiency evaluation monitoring is carried out on the screw pump to be monitored, only the screw pump to be monitored works, and other mud discharging screw pumps are in a stop working state.
Determining the termination time of the effective monitoring time period of the energy efficiency evaluation of the screw pump to be monitored according to the end monitoring signal; the end monitoring signal is a first end monitoring signal or a second end monitoring signal; the first end monitoring signal is a signal generated when the operation signal of the screw pump to be monitored is a closing signal, the operation frequency of the screw pump to be monitored changes, and the inlet valve signal of the sludge bin is a closing signal or reaches a target sludge level; the second end monitoring signal is a signal generated when the operation signal of the screw pump to be monitored is a closing signal, the operation frequency of the screw pump to be monitored changes, and the inlet valve signal of the sludge bin is a closing signal or reaches the target end time.
Step 3: and in the effective monitoring time period, calculating the theoretical conveying mud quantity of the screw pump to be monitored under the running frequency according to the current, the voltage, the rotating speed-power characteristic curve and the rotating speed-flow characteristic curve.
In practical application, according to the first rotating speed-power characteristic curve of the screw pump to be monitored under the first working pressure and the second rotating speed-power characteristic curve under the second working pressure, calculating the third working pressure of the screw pump to be monitored under the current rotating speed-power characteristic curve. The first operating pressure and the second operating pressure are known, and the first rotational speed/power characteristic and the second rotational speed/power characteristic are also known, for example, as determined before shipment of the screw pump to be monitored or as determined from historical data. According to the working parameters of the screw pump to be monitored, a rotating speed-power characteristic curve of the screw pump to be monitored in the current working state, namely a third rotating speed-power characteristic curve, can be obtained, and according to the linear relation between the third rotating speed-power characteristic curve and the first rotating speed-power characteristic curve and the second rotating speed-power characteristic curve, the working pressure corresponding to the third rotating speed-power characteristic curve can be obtained, and the working pressure is called as third working pressure.
And according to the first rotating speed-flow curve of the screw pump to be monitored under the first working pressure and the second rotating speed-flow curve of the screw pump under the second working pressure, a linear interpolation method is applied to obtain a third rotating speed-flow curve under the third working pressure. And calculating the rotating speed of the screw pump to be monitored according to the operating frequency in the operating parameters of the screw pump to be monitored, and obtaining the theoretical mud conveying amount of the screw pump to be monitored under the operating frequency according to the rotating speed and the third rotating speed-flow curve.
Step 4: and in the effective monitoring time period, measuring the conveying mud quantity of the screw pump to be monitored by using a volumetric method according to the real-time monitoring signal under the operating frequency to obtain the measured conveying mud quantity.
Step 5: and according to the ratio of the theoretical conveying mud amount to the corresponding measured conveying mud amount in the effective monitoring time period, carrying out real-time evaluation on the energy efficiency of the screw pump to be monitored.
As a specific embodiment, the evaluation method further includes:
and calculating the volumetric efficiency of the screw pump to be monitored at a plurality of frequencies.
And acquiring historical average volumetric efficiency of the screw pump to be monitored at each frequency.
Determining the state of the screw pump to be monitored according to the comparison result of the volumetric efficiency and the corresponding historical average volumetric efficiency; the conditions of the screw pump to be monitored include normal and failure.
Specifically, when the state of the screw pump to be monitored is a fault, an alarm signal is generated.
The screw pump energy efficiency evaluation method based on the mud conveying amount provided by the invention comprises the following steps in practical application:
and S1, acquiring parameters such as the operating frequency, current, voltage and the like of the screw pump.
And S2, estimating the current working pressure by adopting an interpolation method according to a rotating speed-power characteristic curve of the screw pump, and calculating theoretical mud quantity under different frequencies according to the rotating speed-flow curve.
In practical application, as shown in fig. 5 to 6, a certain screw pump is taken as an example, and the flow of the screw pump is obtained. The rotation speed calculation formula is as follows: n=60 f/p; the power calculation formula is: from the characteristic curve of the screw pumpThe rotation speed and the conveying capacity of the screw pump are in linear relation.
According to the screw pump speed-power curve, the power of the screw pump is proportional to its speed, i.e. n=k, with its operating pressure unchanged 1 ×n+b 1 . The known rotational speed-power characteristic curve of a screw pump factory is taken as a base line, and A is used 1 ，B 1 Representing the rotation speed-power characteristic curve under the actual working condition to be solved by using C 1 Representing, building a mathematical model:
n A ＝(N A -b A )/k A ，n B ＝(N B -b B )/k B ，N A ＝N B ＝N C 。
at A 1 The working pressure under the characteristic curve is P A At B 1 The working pressure under the characteristic curve is P B The characteristic curve C can be obtained by linear interpolation 1 The following actual working pressure: p (P) C ＝(P B -P A )/(n A -n B )。
According to the rotation speed-flow curve of the screw pump, the theoretical conveying capacity of the screw pump is directly proportional to the rotation speed under the condition that the working pressure is unchanged, namely Q t ＝k 2 ×n+b 2 . The known rotational speed-flow characteristic curve of screw pump out plant is used as a base line, A is used 2 ，B 2 Indicating according to the working pressure P C C for solving rotating speed-flow characteristic curve under actual working condition 2 The method comprises the steps of representing, determining a scale factor alpha of a band-solving curve C, and establishing a mathematical model:
Q A ＝k A2 ×n A +b A2 ，Q B ＝k B2 ×n B +b B2 ，Q C ＝α(Q A +Q B )，n A ＝n B ＝n C 。
obtaining curve C by linear interpolation 2 The theoretical conveying capacity of the screw pump under the current working condition can be calculated through the actual rotating speed.
And step S3, setting a monitoring mode, monitoring a valve state in the system, a mud level sensor signal in a bin, a valve signal, an operation signal of a screw pump, a frequency signal and the like, and recording the time required by the outflow of the sludge or recording the mud level of the sludge drop in unit time.
In practical application, a monitoring mode is set, a valve state in a system, a mud level sensor signal in a bin, a valve signal, an operation signal of a screw pump, a frequency signal and the like are monitored, and the time required by the outflow of the sludge is recorded, or the mud level of the sludge falling in unit time is recorded.
The specific calling and calculating method is as follows:
when the inlet valve of the sludge bin is in a closed state or the sludge inlet screw pump is in a closed state and the outlet valve is in an open state, no new sludge is conveyed into the system, and the system has a starting condition.
In the mud level monitoring mode, a user inputs a target mud level on a human-computer interaction interface and records the target mud level as data 1.
And transmitting the system time, the mud level in the storage bin, the screw pump frequency and the current to a data caching module for storage so as to call calculation by a subsequent model, and recording the calculation as data 2.
When the outlet valve of the sludge bin is closed or the sludge outlet screw pump is closed, the frequency is changed or the sludge level reaches the target sludge level input by a user, namely the working condition is changed or the calculation termination condition is met. And transmitting the system time, the frequency of the screw pump and the current to a data caching module at the moment, and recording the system time, the frequency of the screw pump and the current as data 3.
The calling unit transmits the data 1, the data 2 and the data 3 to the calculation module for calculation.
Similarly, in the time monitoring mode, the user inputs the termination time on the man-machine interface, and records the termination time as data 4.
And transmitting the mud level in the storage bin, the frequency of the screw pump and the current to a data caching module for storage so as to enable a subsequent model to call calculation and record as data 5.
When the outlet valve of the sludge bin is closed or the sludge outlet screw pump is closed, the frequency is changed or the time reaches the set time input by a user, namely the working condition is changed or the calculation termination condition is satisfied. The system time, the frequency of the screw pump and the current at this time are transmitted to a data buffer module and recorded as data 6.
The calling unit transmits the data 4, the data 5 and the data 6 to the calculation module for calculation.
And S4, calculating the conveying capacity through a volumetric method, comparing the conveying capacity with the theoretical conveying capacity, judging the deviation value of the conveying capacity under the corresponding frequency, and evaluating the energy efficiency of the screw pump.
In practical application, in the calculation module, the volumetric method is adopted to calculate the conveying capacity, meanwhile, the conveying capacity is compared with the theoretical conveying capacity, the deviation value of the conveying capacity under the corresponding frequency is judged, and the screw pump energy efficiency is evaluated.
Wherein, the calculation formula for measuring the conveying amount is as follows:the volumetric efficiency formula of the screw pump is as follows:wherein Q is the measured conveying mud amount; LVL (Linear liquid crystal display) i For the mud level at the start time, L i+1 For the mud level at the end time, A is the bottom area of the bin, and Deltat is the measurement time. Δt=t i+1 -t i Wherein t is i+1 For the termination time of the ith measurement, t i The starting time of the ith measurement.
And (3) storing the calculated volumetric efficiency under different frequencies into a data storage module, judging that the screw pump is likely to have faults and blockage when the volumetric efficiency under the frequency is obviously lower than the historical average volumetric efficiency, alarming the screw pump, displaying the alarm on a human-computer interaction interface and storing an alarm record into a historical report.
In practical applications, the data 2 and the data 5 include: the method comprises the steps of calculating theoretical conveying mud quantity of the screw pump to be monitored under the running frequency, monitoring whether frequency change occurs, and ending the evaluation of the energy efficiency of the screw pump to be monitored at the moment when the screw pump frequency changes, wherein the evaluation of the energy efficiency of the screw pump to be monitored is continued in real time until the condition that the evaluation of the energy efficiency of the screw pump to be monitored is started again is met, and starting from the moment when the condition that the evaluation of the energy efficiency of the screw pump to be monitored is started again is met. The current of the screw pump to be monitored is used for calculating the theoretical conveying mud quantity of the screw pump to be monitored under the operating frequency in real time. The mud level in the bin is used for calculating and measuring the conveying quantity, and at the same time, in order to monitor whether the target mud level input by a user is reached, the energy efficiency evaluation of the screw pump to be monitored is finished at the moment when the target mud level input by the user is reached, the energy efficiency evaluation of the screw pump to be monitored is not continued in real time until the condition for restarting the energy efficiency evaluation of the screw pump to be monitored is met, and the moment when the condition for restarting the energy efficiency evaluation of the screw pump to be monitored is met is started.
In the practical application process, a plurality of mud feeding screw pumps or mud feeding pipelines with valves are arranged, and a plurality of mud discharging screw pumps are arranged at the outlet of the mud storage bin. The system evaluates the energy efficiency of a single mud-discharging screw pump each time.
When the volumetric method is used for measuring, the signals of the screw pump, including the running signals of the mud feeding screw pump and the running signals of the valves (in a closed state), need to be monitored firstly, so that the mud storage bin is ensured not to be fed with mud, and only one mud discharging screw pump in the system is running (namely, the running signals of the mud discharging screw pump need to be monitored).
In the measuring process, the signals are monitored, and meanwhile, the frequency, the bin mud position and the time of the mud screw pump are monitored. When these running signals and frequency signals change or the monitoring conditions (time/mud level) set at the beginning are met, the measurement can be stopped.
And then, according to the collected measurement data, evaluating the energy efficiency of the screw pump. When the condition for starting the evaluation next time is satisfied, the screw pump is continuously evaluated next time. Therefore, the invention can realize the online evaluation of the energy efficiency of the screw pump.
The invention provides two monitoring modes of conveying capacity evaluation, namely an immediate monitoring mode and a mud level monitoring mode. The invention can realize the long-term real-time automatic numerical calculation of the conveying capacity and efficiency of the screw pump for conveying the high-viscosity medium (sludge). In actual production, the problems that the conveying capacity of the screw pump is reduced, whether blockage occurs or not and the like can be solved, and theoretical basis and guidance are provided for operators under the condition that the flow sensor cannot effectively meter.
The invention has the following advantages:
1. the automatic unmanned metering device is convenient to operate and can realize automatic unmanned metering. The operator only needs to set a monitoring mode (mud level monitoring or time monitoring) on the man-machine interaction interface, the monitoring and calling module of the system can automatically monitor related parameters of the system, start calculation when the monitoring parameters meet the monitoring conditions, call model calculation when the monitored parameters meet the monitoring conditions, automatically upload results to the man-machine interaction interface for display, and generate a calculation result report.
2. The real-time performance is high. In the prior art, a leakage model of the screw pump is mostly established by numerical simulation and other methods, the actual conveying capacity and leakage capacity of the screw pump are estimated by combining simulation and experiment, and the real-time performance is low and cannot be applied to actual production.
3. The precision is high. At present, most sewage treatment plants and sludge incineration plants estimate the sludge flow only by means of empirical formulas or measure the sludge flow by adopting flow meters such as ultrasonic waves. In practical applications, due to the complex nature and high viscosity of sludge, and the high content of solid particles and impurities, these substances may accumulate on the flow sensor, causing the sensor to clog, affecting the measurement result.
4. Versatility. The existing estimation of the conveying quantity of the sludge screw pump adopts a one-time weighing mode to fit a flow-frequency curve, and the flow is estimated through frequency. However, this method requires only short-time studies on specific sludge, and the flow-frequency curve fitted to the specific sludge needs to be checked regularly, which is not universal.
5. The invention realizes real-time online automatic metering of the sludge screw pump for conveying the substances with larger viscosity such as sludge, has high automation degree, simple operation, labor saving, high accuracy and instantaneity and wide application range, solves the problems of evaluation and diagnosis of conveying capacity and energy efficiency in the running process of the screw pump, and fills the technical blank.
Example two
In order to perform a corresponding method of the above embodiment to achieve the corresponding functions and technical effects, a screw pump energy efficiency evaluation system based on the amount of the conveyed sludge is provided below, the evaluation system comprising:
the man-machine interaction module is used for acquiring a monitoring mode input by a user; the monitoring mode comprises a time monitoring mode and a mud level monitoring mode.
And the data acquisition module is used for acquiring real-time monitoring signals of the screw pump.
And the data storage module is respectively connected with the man-machine interaction module and the data acquisition module and is used for storing the monitoring mode and the real-time monitoring signal.
The calculation module is connected with the data storage module and used for calculating the theoretical conveying mud amount and the measured conveying mud amount according to the monitoring mode and the real-time monitoring signal, and evaluating the energy efficiency of the screw pump to be monitored according to the theoretical conveying mud amount and the measured conveying mud amount to obtain an evaluation result.
As a specific embodiment, the calculation module is further configured to send the theoretical delivered-sludge amount and the measured delivered-sludge amount to the data storage module, and send the evaluation result to the data storage module.
The data storage module is also used for storing the theoretical conveying mud amount, the measured conveying mud amount and the evaluation result.
As a specific embodiment, the calculating module is further configured to calculate volumetric efficiency of the screw pump to be monitored at a plurality of frequencies and historical average volumetric efficiency of the screw pump to be monitored at each of the frequencies, and determine a state of the screw pump to be monitored according to a comparison result of the volumetric efficiency and the corresponding historical average volumetric efficiency; the conditions of the screw pump to be monitored include normal and failure.
Specifically, the calculation module is further configured to generate an alarm signal when the state of the screw pump to be monitored is a fault, and send the alarm signal to the data storage module.
The data storage module is also used for storing the alarm signal and sending the alarm signal to the man-machine interaction module.
And the man-machine interaction module is also used for displaying the alarm signal to the user.
In practical application, as shown in fig. 1-4, the screw pump energy efficiency evaluation system based on the mud conveying amount comprises a data acquisition module, a data storage module, a data monitoring and calling module, a calculation module and a man-machine interaction module.
The data acquisition module is used for acquiring related acquisition parameters in the system, including mud positions of a mud bin, operation signals of a screw pump, frequency parameters, current parameters and the like.
And the data storage module is used for storing acquisition parameters, issuing instructions and model calculation results.
The data monitoring and calling module is divided into a monitoring unit, a data caching unit and a calling unit. The monitoring unit monitors parameters such as system time, valve signals, screw pump operation signals, frequency signals, mud level of the mud bin and the like. And after the monitored working condition meets the starting recording condition (the specific meeting condition is that all valves and the mud feeding screw pump are in a closed state), storing the acquired parameters into a data caching unit. When the monitored working condition meets the calling condition (the specific meeting condition is that the frequency change of the mud outlet screw pump, the time or the mud position reaches the set value of the monitoring instruction, and the like), the mobilizing unit is started, the collected data at the current moment and the data of the data caching unit are transmitted to the calculating module, and model calculation is called. And the calculation result of the calculation module returns to the value data caching unit, and is stored in the data storage module after being analyzed.
And the calculation module is used for calculating the theoretical mud amount, the actual mud amount and the volumetric efficiency of the screw pump, so that the conveying amount and the energy efficiency of the screw pump are evaluated.
And the man-machine interaction module enables a user to give an instruction in a monitoring mode selected by the interface, and checks the running condition of the equipment, the model calculation result and the history report.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (10)
1. A screw pump energy efficiency evaluation method based on the amount of conveyed mud, characterized in that the evaluation method comprises the following steps:
acquiring a real-time monitoring signal of a screw pump to be monitored; the monitoring signal is a first monitoring signal or a second monitoring signal; the first monitoring signals comprise time, an operation signal of the mud feeding screw pump, a target mud level, an inlet valve signal of a mud storage bin, an operation signal of the mud discharging screw pump, a mud level in the storage bin, an operation frequency, current and voltage; the second monitoring signal comprises a start monitoring signal, time, an operation signal of a mud feeding screw pump, an inlet valve signal of a mud storage bin, an operation signal of a mud discharging screw pump, a mud level in the storage bin, an operation frequency, current, voltage and target termination time;
determining an effective monitoring time period of the screw pump energy efficiency evaluation to be monitored according to the real-time monitoring signal;
calculating theoretical conveying mud quantity of the screw pump to be monitored under the running frequency according to the current, the voltage, the rotating speed-power characteristic curve and the rotating speed-flow characteristic curve in the effective monitoring time period;
in the effective monitoring time period, according to the real-time monitoring signal, measuring the conveying mud quantity of the screw pump to be monitored by using a volumetric method under the operating frequency to obtain a measured conveying mud quantity;
and according to the ratio of the theoretical conveying mud amount to the corresponding measured conveying mud amount in the effective monitoring time period, carrying out real-time evaluation on the energy efficiency of the screw pump to be monitored.
2. The method for evaluating the energy efficiency of the screw pump based on the mud conveying amount according to claim 1, wherein determining the effective monitoring time period for evaluating the energy efficiency of the screw pump to be monitored according to the real-time monitoring signal specifically comprises:
determining the starting time of an effective monitoring time period of energy efficiency evaluation of the screw pump to be monitored according to a starting monitoring signal; the start monitoring signal is a signal generated when the operation signal of the mud feeding screw pump is a closing signal, an inlet valve of a mud bin is a closing signal, and the operation signal of the mud discharging screw pump is an opening signal;
determining the termination time of the effective monitoring time period of the energy efficiency evaluation of the screw pump to be monitored according to the end monitoring signal; the end monitoring signal is a first end monitoring signal or a second end monitoring signal; the first end monitoring signal is a signal generated when the running signal of the screw pump to be monitored is a closing signal, the running frequency of the screw pump to be monitored changes, and the inlet valve signal of the sludge bin is an opening signal or reaches a target sludge level;
the second end monitoring signal is a signal generated when the operation signal of the screw pump to be monitored is a closing signal, the operation frequency of the screw pump to be monitored changes, and the inlet valve signal of the sludge bin is a closing signal or reaches the target end time.
3. The screw pump energy efficiency evaluation method based on the amount of the conveyed sludge according to claim 1, wherein the calculation formula of the volumetric method is:
wherein Q is the measured conveying mud amount; LVL (Linear liquid crystal display) i For the mud level at the start time, LVL i+1 For the mud level at the end time, A is the bottom area of the bin, and Deltat is the measurement time.
4. The screw pump energy efficiency evaluation method based on the amount of the conveyed sludge according to claim 1, characterized in that the evaluation method further comprises:
calculating the volumetric efficiency of the screw pump to be monitored at a plurality of frequencies;
acquiring historical average volumetric efficiency of the screw pump to be monitored at each frequency;
determining the state of the screw pump to be monitored according to the comparison result of the volumetric efficiency and the corresponding historical average volumetric efficiency; the conditions of the screw pump to be monitored include normal and failure.
5. The method for evaluating energy efficiency of a screw pump based on an amount of sludge to be conveyed according to claim 4, wherein an alarm signal is generated when the state of the screw pump to be monitored is a failure.
6. The method for evaluating energy efficiency of a screw pump based on an amount of sludge to be conveyed according to claim 4, wherein the calculation formula of the volumetric efficiency is:
wherein eta v Is volume efficiency; q is the measured conveying mud amount; q (Q) t The mud amount is theoretically conveyed.
7. A screw pump energy efficiency evaluation system based on a delivered-sludge amount, the evaluation system comprising:
the man-machine interaction module is used for acquiring a monitoring mode input by a user; the monitoring mode comprises a time monitoring mode and a mud level monitoring mode;
the data acquisition module is used for acquiring real-time monitoring signals of the screw pump;
the data storage module is respectively connected with the man-machine interaction module and the data acquisition module and is used for storing the monitoring mode and the real-time monitoring signal;
the calculation module is connected with the data storage module and used for calculating theoretical conveying mud quantity and measured conveying mud quantity according to the monitoring mode and the real-time monitoring signal, and evaluating the energy efficiency of the screw pump to be monitored according to the theoretical conveying mud quantity and the measured conveying mud quantity to obtain an evaluation result.
8. The progressive cavity pump energy efficiency evaluation system based on a delivered-mud amount of claim 7, wherein the calculation module is further configured to send the theoretical delivered-mud amount and the measured delivered-mud amount to the data storage module, and to send the evaluation result to the data storage module;
the data storage module is also used for storing the theoretical conveying mud amount, the measured conveying mud amount and the evaluation result.
9. The system for evaluating energy efficiency of a screw pump based on an amount of delivered mud according to claim 7, wherein the calculation module is further configured to calculate volumetric efficiency of the screw pump to be monitored at a plurality of frequencies and historical average volumetric efficiency of the screw pump to be monitored at each of the frequencies, and determine a state of the screw pump to be monitored according to a comparison result of the volumetric efficiency and the corresponding historical average volumetric efficiency; the conditions of the screw pump to be monitored include normal and failure.
10. The screw pump energy efficiency evaluation system based on the amount of delivered mud of claim 9, wherein the computing module is further configured to generate an alarm signal when the status of the screw pump to be monitored is a fault, and send the alarm signal to the data storage module;
the data storage module is also used for storing the alarm signal and sending the alarm signal to the man-machine interaction module;
and the man-machine interaction module is also used for displaying the alarm signal to the user.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311868824.6A CN117823406A (en) | 2023-12-29 | 2023-12-29 | Screw pump energy efficiency evaluation method and system based on mud conveying amount |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311868824.6A CN117823406A (en) | 2023-12-29 | 2023-12-29 | Screw pump energy efficiency evaluation method and system based on mud conveying amount |
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| CN117823406A true CN117823406A (en) | 2024-04-05 |
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| CN202311868824.6A Pending CN117823406A (en) | 2023-12-29 | 2023-12-29 | Screw pump energy efficiency evaluation method and system based on mud conveying amount |
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| Country | Link |
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| CN (1) | CN117823406A (en) |
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- 2023-12-29 CN CN202311868824.6A patent/CN117823406A/en active Pending
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