CN116136508A - Insulation layer soaking monitoring method and monitoring device - Google Patents
Insulation layer soaking monitoring method and monitoring device Download PDFInfo
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- CN116136508A CN116136508A CN202111370496.8A CN202111370496A CN116136508A CN 116136508 A CN116136508 A CN 116136508A CN 202111370496 A CN202111370496 A CN 202111370496A CN 116136508 A CN116136508 A CN 116136508A
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Abstract
The invention belongs to the technical field of insulation monitoring, and particularly relates to an insulation soaking monitoring device and a monitoring method, wherein the monitoring device comprises the following steps: the upper computer sends out a working instruction to the singlechip; the singlechip receives a working instruction sent by the upper computer and sends working signals to the signal generating module and the control module; the signal generation module applies a working signal to the control module executing mechanism; the control module amplifies power of signals sent by the singlechip and drives the control module executing mechanism; the control module executing mechanism receives the working signals from the signal generating module and the control module and applies potential difference excitation signals to the conductivity monitoring electrode. According to the invention, the conductivity of the insulating layer is monitored in real time by arranging the monitoring module and the insulating layer conductivity monitoring electrode, and the feedback insulating layer conductivity value is judged by arranging the control module executing mechanism, so that potential difference excitation signals are applied, whether the insulating layer is immersed or not is continuously monitored, and the judging accuracy is improved.
Description
Technical Field
The invention belongs to the technical field of insulation monitoring, and particularly relates to an insulation soaking monitoring device and an insulation soaking monitoring method.
Background
The external corrosion condition of the petrochemical enterprise is serious at present, particularly the corrosion under the heat insulation layer is serious, and equipment and facilities can be failed, the device is stopped unplanned, and dangerous harmful substances are leaked.
In the working process of the heat preservation layer, the conductivity of the heat preservation layer can be dynamically changed along with the changes of the running state, the environment and the working condition of equipment and facilities. When the conductivity of the insulating layer is low, the deviation caused by the current and the resistance of the electrolyte brings great error to the corrosion electrochemical monitoring result under the insulating layer. The existing heat preservation soaking monitoring methods include a drying and bearing method for collecting heat preservation material samples, a distributed optical fiber technology based on Joule-Thomson effect and an infrared thermal imaging monitoring technology, but cannot effectively compensate monitoring results of heat preservation conductivity.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: a device and a method for monitoring immersion of an insulating layer are provided.
The technical scheme adopted for solving the technical problems is as follows: the method for monitoring the immersion and conductivity of the heat preservation layer in real time comprises the following steps:
s1, an upper computer sends out a working instruction to a singlechip;
s2, the singlechip receives a working instruction sent by the upper computer and sends working signals to the signal generation module and the control module;
s3, the signal generation module applies a working signal to the control module executing mechanism; the control module amplifies power of signals sent by the singlechip and drives the control module executing mechanism;
s4, the control module executing mechanism receives working signals from the signal generating module and the control module and applies potential difference excitation signals to the conductivity monitoring electrode;
s5, the monitoring module detects the response current signal and feeds back the response current signal to the control module executing mechanism, and the control module executing mechanism judges the response current signal and works according to the judging result;
s6, the A/D conversion module acquires an analog signal in the monitoring module and converts the analog signal into a digital signal;
s7, the singlechip collects digital signals and uploads the digital signals to the upper computer;
s8, the upper computer processes the acquired digital signals.
Further, the potential difference excitation signal described in S4 is 5-15mV.
Further, the monitoring module detects the response current signal and feeds back the response current signal to the control module executing mechanism, the control module executing mechanism judges the response current signal and works according to the judging result, and the monitoring module comprises:
the control module executing mechanism acquires a response current signal;
the control module executing mechanism compares the response current value with a set monitoring lower limit;
when the response current value is smaller than the monitoring lower limit, an excitation signal is always applied; when the response current value is greater than the monitoring lower limit, the excitation signal is repeatedly applied every one hour.
Further, the processing of the collected digital signal by the upper computer in S8 includes:
measuring and calculating the resistance of the electrolytic cell through the measured current value and the voltage value;
calculating the resistance of the heat preservation layer through the resistance at the two ends of the electrolytic cell;
and calculating the conductivity of the insulating layer through the resistance of the insulating layer.
Further, an insulation layer monitoring devices that soaks includes: the device comprises an upper computer, a singlechip, a signal generation module, a control module executing mechanism, a conductivity monitoring electrode, a monitoring module and an A/D conversion module.
Further, the conductivity monitoring electrode includes an encapsulation resin, a sheet electrode provided on the encapsulation resin, and a jig connecting the encapsulation resin.
Further, the output end of the monitoring module is connected with the input end of the A/D conversion module.
Further, the input end of the singlechip is connected with the control module, the upper computer and the A/D conversion module; the output end of the singlechip is connected with the signal generation module and the control module.
Further, the input end of the control module executing mechanism is connected with the signal generating module and the control module; and the output end of the control module executing mechanism is connected with the monitoring module.
Further, the output end of the monitoring module is connected with the A/D conversion module.
The beneficial effects of the invention are as follows: according to the invention, the conductivity of the insulating layer is monitored in real time by arranging the monitoring module and the insulating layer conductivity monitoring electrode, and the feedback insulating layer conductivity value is judged by arranging the control module executing mechanism, so that potential difference excitation signals are applied, whether the insulating layer is immersed or not is continuously monitored, and the judging accuracy is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art. The present invention will now be described in detail with reference to the accompanying drawings. The figure is a simplified schematic diagram illustrating the basic structure of the invention only by way of illustration, and therefore it shows only the constitution related to the invention.
FIG. 1 is a block diagram of an insulation water immersion monitoring apparatus of the present invention;
FIG. 2 is a schematic diagram of the conductivity monitoring electrode of the insulation water immersion monitoring apparatus shown in FIG. 1;
FIG. 3 is a schematic diagram of a portion of a circuit of an insulation water immersion monitoring apparatus of the present invention;
FIG. 4 is a flow chart of a method of monitoring insulation flooding in accordance with the present invention;
FIG. 5 is a schematic representation of the finite element analysis of the effect of the shape of the insulation on conductivity according to the present invention.
In the figure:
the device comprises a host computer 1, a singlechip 2, a signal generation module 3, a control module 4, a control module executing mechanism 5, a conductivity monitoring electrode 6, packaging resin 61, a sheet electrode 62, a clamp 63, a monitoring module 7 and an A/D conversion module 8.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are 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.
Referring to fig. 1, a real-time insulation layer soaking and conductivity monitoring device includes an upper computer 1, a single chip microcomputer 2, a signal generating module 3, a control module 4, a control module executing mechanism 5, a conductivity monitoring electrode 6, a monitoring module 7, and an a/D conversion module 8.
The signal generation module 3 is a potential difference excitation signal generation circuit; the monitoring module 7 is a conductivity monitoring circuit, and is a common zero ohm monitoring circuit; the A/D conversion module 8 is an A/D conversion circuit; the control module actuator 5 is a conventional relay.
Referring to fig. 2, the conductivity monitoring electrode 6 includes an encapsulation resin 61, a sheet-like electrode 62 provided on the encapsulation resin 61, and a jig 63 connecting the encapsulation resin 61. The two sheets of packaging resin 61 are parallel to each other and have the same appearance, and the sheet-shaped electrode 62 is arranged in the packaging resin 61, and only one exposed working surface is reserved, and materials such as metal platinum, graphite, stainless steel, metal titanium and the like can be selected.
When the conductivity monitoring electrode 6 is required to work, the conductivity monitoring electrode 6 is inserted into the heat insulation layer, the distance between the working surfaces of the two sheet electrodes 62 is adjusted to be 5mm, the heat insulation layer is ensured to be filled between the two sheet electrodes 62, the pressure range between the conductivity monitoring electrode 6 and the heat insulation layer is controlled to be 10-30Pa, good contact between the sheet electrodes 62 and the heat insulation layer is ensured, and the apparent density of the heat insulation layer in a crack is not obviously reduced.
When conducting the insulation layer soaking and conductivity monitoring device to conduct conductivity monitoring, see fig. 4, the method comprises the following steps:
s1, an upper computer 1 sends a working instruction to a singlechip 2;
s2, the singlechip 2 receives a working instruction sent by the upper computer 1 and sends working signals to the signal generation module 3 and the control module 4;
s3, after the signal generating module 3 receives the working signal sent by the singlechip 2, the working signal is applied to the control module executing mechanism 5; the control module 4 amplifies the power of the signal sent by the singlechip 2 and drives the control module executing mechanism 5;
s4, the control module executing mechanism 5 receives working signals from the signal generating module 3 and the control module 4 and applies a potential difference excitation signal of 5-15mV to the conductivity monitoring electrode 6;
s5, the monitoring module 7 monitors the response current signal and feeds back the response current signal to the control module actuating mechanism 5, if the response current value is smaller than the monitoring lower limit, the insulation layer is judged to be dry at the same time, and the control module actuating mechanism 5 always applies potential difference excitation signals to the conductivity monitoring electrode 6; if the response current value is larger than the monitoring lower limit, the response current value finishes the excitation signal when the floating range is smaller than +/-1% within the time range of 1 second, and the control module actuating mechanism 5 repeatedly applies the excitation signal every 1 hour until the response current value is smaller than the monitoring lower limit, so that on one hand, the false capacitance effect on the electrode is avoided when the water immersion quantity is smaller, and the change of the micro-area environment due to the Faraday effect is avoided, and on the other hand, the water immersion quantity gradually drops due to the baking of high-temperature pipeline equipment or the stopping of the water immersion source after water immersion, and the electric conductivity is required to be monitored periodically.
The value of the monitoring lower limit mainly depends on the monitoring lower limit of the zero ohm meter instrument and the condition of field interference, and in the embodiment, the value is 0.1-50 nanoampere.
S6, the A/D conversion module 8 acquires an analog signal in the monitoring module 7 and converts the analog signal into a digital signal;
s7, the singlechip 2 collects the digital signal 1 and uploads the digital signal 1 to the upper computer 1;
s8, the upper computer 1 processes the acquired digital signals and outputs the conductivity of the heat preservation layer;
specifically, as shown in FIG. 3, the amplitude of the potential difference excitation signal is U 0 In the electrolytic cell composed of the sheet electrode 62 and the measured heat-insulating layer, the compensation liquid is connected with the resistor R s Reaction resistance R a Insulation resistance R. As shown in fig. 2, under the control of the control module 4, the control module actuator 5 controls the K and a ends to be closed. At this time, it is assumed that the resistance at both ends of the electrolytic cell is R x Then R is x ＝U 0 /I 0 。
Wherein, the compensation liquid is connected with the resistor R s The reason for this is: the sheet electrode 62 conducts electricity by electron-oriented movement and the solution conducts electricity by ion-oriented movement, and when the sheet electrode 62 is inserted into the solution, an gap of atomic scale size is created between the sheet electrode 62 and the solution, and this structure is called an electric double layer electrochemically. The current is passed through the double layer to overcome a resistance referred to as a fluid junction resistance, which is in the present embodimentCompensating liquid connection resistor R s 。
Reaction resistance R a : also called Faraday resistor, a common scenario is to electrolyze water, hydrogen ions form hydrogen gas on the surface of an electrode, and the generated resistance is the reaction resistance due to a process of converting electric energy into chemical energy.
Two-end resistor R of electrolytic cell x Comprises a compensation liquid connection resistor R s Reaction resistance R a Insulation resistance R, then r=r x -R a -R s 。
Determination of R a And R is R s The process of (1) is as follows: firstly, two heat preservation layers with proper sizes and consistent appearance are cut, weighing records are carried out on the two heat preservation layers, and first weighing data are recorded. And (3) wetting the two cut heat-insulating layers, ensuring that the water quantity of the two wetted heat-insulating layers is the same, recording the second weighing data and measuring the volume water content of the heat-insulating layers. And wrapping the two heat preservation layers with a preservative film, standing for 24 hours, extruding a part of water in one heat preservation layer to serve as heat preservation layer leaching liquid, measuring the conductivity of the heat preservation layer leaching liquid by using a conductivity detection instrument, and calculating the density of the leaching liquid. And multiplying the volume water content by the conductivity of the leaching solution of the heat preservation layer to obtain the conductivity sigma of the heat preservation layer. After measuring the conductivity sigma of the insulating layer, firstly, the conductivity sigma is carried into sigma=L/(R) r A), calculating the resistivity R of the heat-insulating layer r Then the resistivity R of the heat preservation layer is increased r Substituted into R r =f (σ, R), the insulation resistance R is calculated. Measuring the resistance R at two ends of the electrolytic cell by using an ohmmeter x R is taken as x Substituting R=Rx-Ra-Rs to calculate R a +R s 。
Wherein, see fig. 5, electric field modeling analysis is performed on two electrode plates as positive and negative electrodes through finite element analysis software to calculate the electric conductivities sigma of different heat preservation layers, and the electric resistivities R of different heat preservation layers r Under the condition of (1) measuring a series of data of the insulation resistance R, and using data analysis software to couple the series of data as a function to obtain the insulation resistivity R between the sheet electrodes 62 r The relation with the resistance R of the heat preservation layer is as follows:
R r ＝f(σ，R) (1)
in the formula (1), sigma is the conductivity of the heat preservation layer.
Conductivity sigma and R of heat insulation layer r The relation of (2) is:
σ＝L/(R r ·A) (2)
in the formula (2), A is the area of the electrode plates, and L is the spacing of the electrode plates.
When the conductivity sigma of the heat preservation layer in a specific environment needs to be tested, the testing and calculating steps are as follows:
(1) by actually measured R x Obtaining the resistance R of the heat preservation layer, and enabling the conductivity sigma of the heat preservation layer to be equal to 0 Insulation resistance R and insulation conductivity σ are calculated =0.1S/m 0 Substituting into (1) to obtain the resistivity R of the heat preservation layer r0 ；
(2) The calculated resistivity R of the insulating layer r0 Substituting into (2) to obtain the conductivity sigma of the heat-insulating layer 1 ；
(3) If sigma at this time 1 -σ 0 And (3) repeating the step (1) and the step (2) if the ratio is more than or equal to 0.001S/m, and performing iterative calculation: will sigma 1 Substituting into (1) to obtain R r1 R is then added with r1 Substituting (2) to obtain sigma 2 If sigma 2 -σ 1 And (3) if the ratio is more than or equal to 0.001S/m, continuing to perform iterative calculation until sigma i -σ i-1 Less than 0.001S/m, and outputting the calculated result sigma of the conductivity of the heat preservation layer i 。
In summary, the invention connects the compensation liquid with the resistor R in the process of monitoring whether the insulation layer is immersed s And reaction resistance R a In consideration of error factors, the response current value in the real-time insulation layer soaking and conductivity detection device is monitored in real time through the monitoring module 7, and the control module executing mechanism 5 carries out the next action through the response current value, so that the real-time insulation layer soaking condition is ensured to be more accurate.
While the foregoing is directed to the preferred embodiment of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.
Claims (10)
1. The method for monitoring the immersion of the heat preservation layer is characterized by comprising the following steps of:
s1, an upper computer sends out a working instruction to a singlechip;
s2, the singlechip receives a working instruction sent by the upper computer and sends working signals to the signal generation module and the control module;
s3, the signal generation module applies a working signal to the control module executing mechanism; the control module amplifies power of signals sent by the singlechip and drives the control module executing mechanism;
s4, the control module executing mechanism receives working signals from the signal generating module and the control module and applies potential difference excitation signals to the conductivity monitoring electrode;
s5, the monitoring module detects the response current signal and feeds back the response current signal to the control module executing mechanism, and the control module executing mechanism judges the response current signal and works according to the judging result;
s6, the A/D conversion module acquires an analog signal in the monitoring module and converts the analog signal into a digital signal;
s7, the singlechip collects digital signals and uploads the digital signals to the upper computer;
s8, the upper computer processes the acquired digital signals.
2. The method for monitoring the flooding of the heat preservation layer according to claim 1, wherein the potential difference excitation signal in the step S4 is 5-15mV.
3. The method for monitoring the flooding of the insulating layer according to claim 1, wherein the monitoring module detects the response current signal and feeds back the response current signal to the control module actuator, and the control module actuator determines the response current signal and operates according to the determination result, and the method comprises the steps of:
the control module executing mechanism acquires a response current signal;
the control module executing mechanism compares the response current value with a set monitoring lower limit;
when the response current value is smaller than the monitoring lower limit, an excitation signal is always applied; and when the response current value is larger than the monitoring lower limit, repeatedly applying an excitation signal every one hour, and keeping monitoring the heat insulation layer.
4. The method for monitoring the immersion of the heat preservation layer according to claim 1, wherein the step of processing the collected digital signals by the upper computer in S8 comprises the steps of:
measuring and calculating the resistance of the electrolytic cell through the measured current value and the voltage value;
calculating the resistance of the heat preservation layer through the resistance at the two ends of the electrolytic cell;
and calculating the conductivity of the insulating layer through the resistance of the insulating layer.
5. An insulation layer monitoring device that soaks, characterized in that includes: the device comprises an upper computer, a singlechip, a signal generation module, a control module executing mechanism, a conductivity monitoring electrode, a monitoring module and an A/D conversion module.
6. The insulation water immersion monitoring apparatus according to claim 5, wherein the conductivity monitoring electrode comprises an encapsulation resin, a sheet electrode provided on the encapsulation resin, and a jig for connecting the encapsulation resin.
7. The insulation submergence monitoring device of claim 5 wherein the monitor module output is connected to the input of the a/D conversion module.
8. The insulation layer soaking monitoring device according to claim 5, wherein the input end of the single chip microcomputer is connected with the control module, the upper computer and the A/D conversion module; the output end of the singlechip is connected with the signal generation module and the control module.
9. The insulation layer flooding monitoring device according to claim 5, wherein an input end of the control module executing mechanism is connected with the signal generating module and the control module; and the output end of the control module executing mechanism is connected with the monitoring module.
10. The insulation water immersion monitoring device according to claim 5, wherein the output end of the monitoring module is connected with the a/D conversion module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111370496.8A CN116136508A (en) | 2021-11-18 | 2021-11-18 | Insulation layer soaking monitoring method and monitoring device |
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| CN202111370496.8A CN116136508A (en) | 2021-11-18 | 2021-11-18 | Insulation layer soaking monitoring method and monitoring device |
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| CN116136508A true CN116136508A (en) | 2023-05-19 |
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| CN202111370496.8A Pending CN116136508A (en) | 2021-11-18 | 2021-11-18 | Insulation layer soaking monitoring method and monitoring device |
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