CN113944891A - Chemical device facility leakage detection and correction method - Google Patents
Chemical device facility leakage detection and correction method Download PDFInfo
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- CN113944891A CN113944891A CN202111310931.8A CN202111310931A CN113944891A CN 113944891 A CN113944891 A CN 113944891A CN 202111310931 A CN202111310931 A CN 202111310931A CN 113944891 A CN113944891 A CN 113944891A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
- F17D5/06—Preventing, monitoring, or locating loss using electric or acoustic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
Abstract
The invention discloses a correction method for leakage detection of a chemical device, which comprises the steps of dividing a limited pipeline into different areas according to the setting of each valve, and detecting the change of static pressure in the pipeline in each different area; when the static pressure is determined to have variation, judging that the leakage possibility exists in the area, and compensating the reduction of the volume of the normally conveyed liquid by using the introduction amount of the substitute liquid; a heating device is additionally arranged on the closed pipeline section; the method judges whether leakage exists or not and executes leakage positioning according to the pressure, flow and temperature curves, realizes the correction of leakage detection through the combination of flow, temperature and pressure parameters, and effectively prevents false alarms and realizes accurate positioning through the preprocessing of pressure signals.
Description
Technical Field
The invention relates to the safety monitoring of chemical pipelines and chemical devices, in particular to a chemical device facility leakage detection and correction method in a chemical park.
Background
Along with the development of economy, the effect of chemical products in economic life is highlighted by key, and devices such as chemical industry all relate to the high-risk, high risk or have the chemical products that highly diffuse pollutes generally, and chemical products bring convenience to mankind in the benefit, and the safety of chemical plant device and facility also receives public's attention. Chemical safety is an important component in public safety and also is the core of the production safety field.
Especially for the industrial park with concentrated chemical industry, once the flammable, explosive and toxic gas leaks in the production, transportation and use processes, poisoning, fire and even explosion accidents can be caused, the life and property safety of people can be seriously harmed, and even if the gas is transmitted by adopting a pipeline, the risk of leakage also exists. How to balance the high efficiency of the facility detection of the chemical device and not influence the production becomes the subject of research, namely, the possibility of early warning can exist for the leakage of the chemical device, and the influence on the normal production caused by excessive false alarms is avoided.
Disclosure of Invention
Therefore, the method for correcting the leakage detection of the chemical device is provided to improve the detection precision of the leakage of the pipeline arrangement.
The method specifically comprises the following steps: monitoring the leakage of the pipeline during transmission by placing a counter at each of the pipeline intersection and the outlet of the pipeline, one of which is near the inlet of the pipeline and the other is near the outlet; when the flow quantity recorded at the two ends of the pipeline is not within the flow threshold range, the pipeline is liquid-tight;
when the error of the counter is not within the flow threshold range, determining that leakage is possible, dividing the limited pipeline into different areas according to the setting area of each valve, and detecting the change of the nominal static pressure in the pipeline in each different area; if the static pressure is kept constant, judging that no leakage exists in the area;
when the static pressure is determined to have variation, judging that the area has possible leakage, closing the pair of spaced block valves to form a section of blocked closed pipeline containing liquid, introducing substitute liquid similar to the liquid generally conveyed through the pipeline into the closed pipeline through the input access pipeline, wherein the introduction amount of the substitute liquid compensates for the reduction of the volume of the normally conveyed liquid;
establishing a first flow path of pipeline fluid outside the closed pipeline, controlling the flow rate of the pipeline fluid in the first flow path through a throttle valve, enabling part of liquid in the first flow path to flow into the blocked and closed pipeline section through an access pipeline, and measuring the amount of liquid flowing through the access pipeline;
a heating device is additionally arranged on the closed pipeline section; heating and cooling the liquid in the closed section at least once; measuring again the amount of any liquid along the access conduit during at least one of said heating periods and during at least one of said cooling periods; determining a difference between the amount of liquid flow measured during the heating and the amount of liquid flow measured during the cooling;
when the difference value of the flow quantity is smaller than the set value, judging that no leakage exists when the static pressure change is caused by the temperature difference of the pipeline; when the flow difference is not within the range of the set value, starting the alarm device to act; and the size of the leak is inferred from the amount of replacement liquid introduced into the closed conduit per unit time.
Optionally, when the flow difference is not within the pressure threshold range and the pressure difference gradient value continuously decreases to be larger than the threshold, starting the alarm device to act; and the size of the leak is inferred from the amount of replacement liquid introduced into the closed conduit per unit time.
Optionally, when the heating device heats the liquid in the pipeline to the same ambient temperature, the pressure difference in the pipeline is measured, and a relation graph of d (p)/dt and time is drawn to assist in determining the size of the leakage.
Optionally, the counter is a sensor comprising a flow rate measurement and a pressure measurement.
Optionally, when leakage is judged, positioning of a leakage point is performed, changes of pressure waves are detected at different times according to pressure measurement sensors at two ends of the pipeline, and the position of the leakage point is judged; determining the propagation speed of the pressure wave, and positioning a leakage point according to the time difference of the negative pressure wave transmitted to the sensor by the following formula;
wherein X is the distance between the leakage point and the head end monitoring point, L is the length of the pipeline between the two monitoring points, v is the propagation velocity of pressure wave, v is1The propagation speed of the oil product is shown, and delta t is the time difference of pressure waves received by the sensors at the head end and the tail end; wherein L, v1The location of the leak can be determined by determining, for known quantities, the propagation velocity of the pressure wave and the time difference between the two sensors' monitored pressure wave signals.
Optionally, the abrupt change or transient feature of the signal is extracted through a multi-scale function in the wavelet transform.
Optionally, the position detection of the leakage point further includes detecting inflow and outflow flows at a plurality of point locations in the pipeline, then integrating information to establish a flow balance graph, and determining the position of the leakage point of the pipeline according to the change of the graph.
The method realizes the correction of the judgment leakage through the combination of flow, temperature and pressure parameters, and effectively prevents the generation of false alarms and realizes accurate positioning through the preprocessing of signals.
Drawings
The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are schematic and should not be construed as limiting the invention in any way, and in which
FIG. 1 is a schematic flow diagram of the process of the present invention.
Detailed Description
These and other features and characteristics of the present invention, as well as the methods of operation and functions of the related elements of structure and the combination of parts and economies of manufacture, will be better understood upon consideration of the following description and the accompanying drawings, which form a part of this specification. It is to be expressly understood, however, that the drawings are for the purpose of illustration and description only and are not intended as a definition of the limits of the invention. It will be understood that the figures are not drawn to scale. Various block diagrams are used in the present invention to illustrate various variations of embodiments according to the present invention.
Example 1
It is a common principle in existing monitoring to judge leakage based on a comparison of input and output; in practice, however, the instantaneous flow rate at the inlet and outlet is generally unbalanced due to various factors such as compressibility of the fluid, temperature influence, metering error of the flow meter, and the like; normally, the difference caused by these aspects is relatively stable, and a difference can be determined to exist according to long-term statistical data. If a large rise of the output difference occurs, the stable state of the output difference is destroyed, and the abnormal condition of the pipeline can be roughly judged, but because the output difference is often raised in the field process operation processes such as valve adjustment, pressurization and the like, the phenomenon is similar to leakage, and therefore, the single adoption of the output difference leakage detection method can cause frequent false alarm.
As shown in fig. 1, the method of the present application provides a method for correcting the leakage detection of a chemical device, so as to improve the detection accuracy of the leakage point of the pipeline. The method specifically comprises the following steps: monitoring the leakage of the pipeline during transmission by placing a counter at each of the pipeline intersection and the outlet of the pipeline, one of which is near the inlet of the pipeline and the other is near the outlet; the conduit is liquid tight when the amount of flow recorded across the conduit is the same or within empirical limits. When the error of the counter is not within the threshold range, it is determined that there is a possibility of leakage, the limiting pipe is divided into different regions according to the setting regions of the valves, and the variation of the nominal static pressure in each pipe is detected. The segmented region is judged to be free of leakage if the static pressure is held constant, and is judged to be leaking when a change in the static pressure is determined.
When a pressure drop therein is found, a liquid-like replacement liquid delivered through the introduction pipe is introduced into the closed pipe in an amount necessary to compensate for the reduction in the volume of the normally delivered liquid; closing the pair of spaced shut-off valves to form a segment of a conduit containing liquid, establishing a first circulating flow path for conduit fluid at a point outside the blocked segment, controlling the flow of circulating line fluid in the first circulating flow path through a throttling valve, allowing a portion of the liquid in the first flow path to flow into the blocked conduit segment, and measuring the amount of liquid flowing through the access conduit;
optionally, when the pressure of the liquid in the first circulation path is lower than a set pressure value, a part of the liquid access pipe in the first flow path is made to flow into the blocked pipe section, and the amount of the liquid flowing through the access pipe is measured; the set pressure value does not influence the reverse backflow of the liquid in the pipe.
Optionally, a first flow path of the pipe fluid is established as a first circulation flow path at a point outside the blocking section, a part of the liquid access pipe in the first flow path is made to flow into the blocked pipe section, and the amount of liquid flowing through the access pipe is measured;
adding a heating device in the closed area; heating and cooling the liquid in the closed section at least once; measuring again the amount of any liquid along the access conduit during at least one of said heating periods and during at least one of said cooling periods; determining a difference between the amount of liquid flow measured during the heating and the amount of liquid flow measured during the cooling;
when the pressure difference gradient value is judged to be smaller than the pressure threshold value, judging that no leakage exists when the static pressure change is judged to be caused by the pipeline temperature difference; when the pressure difference gradient value continuously decreases to be larger than the threshold value, the alarm device acts; and, upon activation of the alarm means, the size of the leak is inferred from the amount of substitution liquid introduced into the closed conduit per unit time.
The reason for performing the comparison using the heating means and the pressure gradient values of the method is that in all those cases in which the pipe section is irregularly cooled due to different ambient temperatures, significant pressure variations occur in the actual test. For example, even a temperature difference of 0.1C may generate a pressure difference of up to 1 bar; as soon as the respective liquid temperature and ambient temperature are equal, the difference between the pressures prevailing in the two adjacent pipe sections remains constant. A leak in a pipe can thus be tested by determining the difference between the pressure difference gradients prevailing in two adjacent pipe sections. In the leakage part, the process of reducing the pressure to increase is acquired through the temperature operation of the heating device, the test data curve obtained in this way plots d (p)/dt against time, and in this way, the possibility of leakage and the size of the leakage are determined simultaneously. A certain amount of liquid is measured by the flow meter, the sensitivity of the flow meter is improved by replacing the liquid increase due to the increase of volume change and the change of liquid temperature, and therefore a small amount of leakage misjudgment is reduced. Generally speaking, a fuel oil pipeline, the leakage to be detected is about 10 liters/hour in such degree, when the diameter of the fuel oil pipeline is 300 mm, the length of the pipeline is set to be 10 km, the change of the fuel oil volume of about 500 liters can be detected in association with the temperature change of 1 degree, therefore, the temperature of the pipeline set by the temperature is changed by a heating module, the leakage detection is optionally carried out when the temperature of the pipeline reaches the ambient temperature, so as to reduce the influence of the temperature change on the initial detection, and then the acquisition of the temperature rising and lowering curve is carried out, so that the leakage possibility confidence interval is obtained by comparing the drawn curve parameter with the leakage characteristic feature or the leakage characteristic value. It is understood that the threshold value and the set pressure value can be set according to historical statistical data, and a technical maintenance reference manual or expert evaluation can be searched.
Furthermore, when a leak is detected, the location of the leak is carried out, and when a leak accident occurs in the pipeline, there is an immediate loss of material at the leak, which can cause a local density reduction and thus a pressure reduction. However, since a flow meter is used to measure the flow rate, and since the flow rate of the fluid in the pipe cannot be changed immediately, the flow rate measurement cannot accurately determine whether there is a leak, but a pressure difference is generated between the fluid at the leak and either end of the leak. This pressure differential causes the liquid to flow from top to bottom to a low pressure region near the leak. The flow immediately squeezes the area of reduced density and pressure due to the leak, creating a new pressure differential between the adjacent leak area and upstream and downstream thereof. A flow of liquid is also generated towards the leak. In practice it has been found that the effect of this interlock accident is that the low pressure wave propagates up and down the pipeline away from the leak.
When a certain point on a pipeline for conveying fluid leaks, the pressure of the point suddenly drops, the fluid conveyed in the pipeline is quickly lost under the action of the internal and external pressure difference, the density of the fluid at the position where the fluid leaks is reduced, the pressure in the pipeline is further reduced, and the fluid diffuses upstream and downstream at a certain speed; by installing pressure sensors at two ends of the pipeline, the change of pressure waves is detected at different times respectively, and whether leakage occurs or not can be judged; if the propagation speed of the pressure wave is determined, the leakage point can be positioned through the time difference of transmitting the negative pressure wave to the sensor;
wherein X is the distance between the leakage point and the head end monitoring point, L is the length of the pipeline between the two monitoring points, v is the propagation velocity of pressure wave, v is1And delta t is the time difference of the pressure waves received by the sensors at the head end and the tail end, which is the propagation speed of the oil product. Wherein L, v1The location of the leak can be determined by determining, for known quantities, the propagation velocity of the pressure wave and the time difference between the two sensors' monitored pressure wave signals.
Preferentially, the data transmission of the sensor can be composed of two parts of information acquisition and information processing, the current popular wireless sensor network technology is used, the real-time dynamic change of pressure waves in a pipeline is remotely monitored, and the real-time performance and the usability of the system are ensured by the access node of the sensor node accelerator of the MMA 7260.
In addition, various interference signals inevitably exist in the actual pipeline in the operation process, and a great deal of noise is attached to the pressure signals collected by the pressure sensors which are usually positioned at the head end and the tail end of the pipeline, so that the identification of the falling edge of the negative pressure wave is very difficult. The definition of the falling edge of the negative pressure wave in the pipeline not only affects the sensitivity and reliability of leakage detection, but also affects the precision of the time difference delta t of the negative pressure wave transmitted to the first end and the last end of the pipeline, and further affects the positioning precision of a leakage hole of the pipeline. In addition, the difference of indirect influence factors such as the position of a leakage hole of the pipeline, the aperture of the leakage hole, the roughness of the inner wall surface of the pipeline, the ambient temperature around the pipeline and the like can also influence the flow velocity of gas in the pipeline, the propagation velocity of negative pressure waves, the definition of the falling edge of the negative pressure waves and the like, and further cause the positioning error of the leakage hole of the pipeline.
The received signals are denoised, pressure and flow changes caused by leakage of an oil pipeline are typical singular points, sudden change or transient characteristics of the signals are extracted through a multi-scale function of wavelet transformation, the positions of the singular points are accurately determined, the measurement precision of pressure wave propagation time difference is effectively improved, and the positioning precision of pipeline leakage points can be improved.
Optionally, a wavelet decomposition is performed using the pressure signal, from high frequency to low frequency into a signal of 8 frequency components. Time domain analysis is performed on each frequency band, and the energy for extracting frequency band information is as follows:
in the formula, S3j is the pressure signal of the frequency band j, and the corresponding energy is E3j, | XjkAnd | is a reconstruction signal, and n is the number of sampling points of the pressure signal.
And performing energy calculation on each wavelet in 8 frequency bands after wavelet packet decomposition to obtain the energy number of each node, and performing normalization processing on the energy of the 8 frequency bands to obtain a feature vector. The wavelet analysis has good analysis capability in time domain and frequency domain by the multi-resolution analysis technology of wavelet transformation, and the working condition noise in the collected signal is removed by wavelet threshold denoising, so that the pipeline leakage detection sensitivity can be improved.
Optionally, determining the location of the leak further comprises performing a correction based on the difference in flow rates, and in a state where the pipe is not leaking, the inlet flow rate and the outlet flow rate should be generally equal. And under the condition of pipeline leakage, a significant flow difference occurs between the inlet and the outlet of the pipeline, and the occurrence of the pipeline leakage is roughly judged through the flow difference, so that accurate positioning cannot be carried out. If the pipeline leakage point needs to be accurately positioned, inflow and outflow flows are detected at a plurality of point positions in the pipeline, then a flow balance graph line is integrated and established after the information is sent, and the position of the pipeline leakage point is judged according to the change of the graph line.
Example 2
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard Disk (Hard Disk Drive, abbreviated as HDD), a Solid State Drive (SSD), or the like; the storage medium may also comprise a combination of memories of the kind described above.
As used in this application, the terms "component," "module," "system," and the like are intended to refer to a computer-related entity, either hardware, firmware, a combination of hardware and software, or software in execution. For example, a component may be, but is not limited to being: a process running on a processor, an object, an executable, a thread of execution, a program, and/or a computer. By way of example, both an application running on a computing device and the computing device can be a component. One or more components can reside within a process and/or thread of execution and a component can be localized on one computer and/or distributed between two or more computers. In addition, these components can execute from various computer readable media having various data structures thereon. The components may communicate by way of local and/or remote processes such as in accordance with a signal having one or more data packets (e.g., data from one component interacting with another component in a local system, distributed system, and/or across a network such as the internet with other systems by way of the signal).
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (9)
1. A method for detecting and correcting leakage of chemical plant facilities is characterized by comprising the following steps: monitoring the leakage of the pipeline during transmission by placing a counter at each of the pipeline intersection and the outlet of the pipeline, one of which is near the inlet of the pipeline and the other is near the outlet; when the difference value of the flow quantity recorded at the two ends of the pipeline is within the threshold value range, the pipeline is liquid-tight;
when the flow quantity difference value of the counter is not in the threshold range, determining that leakage is possible, dividing the limited pipeline into different areas according to the setting of each valve, and detecting the change of static pressure in the pipeline in each different area; if the static pressure is kept constant, judging that no leakage exists in the area;
when the static pressure is determined to have variation, judging that the leakage possibility exists in the area, closing a pair of spaced block valves to form a section of blocked closed pipeline containing liquid, establishing a first flow path of pipeline fluid outside the closed pipeline, controlling the flow rate of the pipeline fluid in the first flow path through a throttle valve, introducing substitute liquid similar to the pipeline fluid into the closed pipeline through an access pipeline, wherein the introduction amount of the substitute liquid compensates for the reduction of the volume of the normally conveyed liquid; allowing part of the liquid in the first flow path to flow into the blocked pipe section through an access pipe, and measuring the amount of the liquid flowing through the access pipe;
a heating device is additionally arranged on the closed pipeline section; heating and cooling the liquid in the closed section at least once; measuring again the amount of all liquid along the access conduit during at least one of said heating periods and during at least one of said cooling periods; determining a difference between the amount of liquid flow measured during the heating and the amount of liquid flow measured during the cooling;
when the difference value of the flow quantity is smaller than the threshold value, judging that no leakage exists when the static pressure change is caused by the temperature difference of the pipeline; when the flow difference is not within the threshold range, starting an alarm device to act; and the size of the leak is inferred from the amount of replacement liquid introduced into the closed conduit per unit time.
2. The method of claim 1, wherein: when the difference value of the flow quantity is not in the threshold value range, the action of starting the alarm device further comprises the following steps: when the difference value of the flow quantity is not in the threshold range and the gradient value of the pressure difference of the closed pipeline continuously drops to be larger than the pressure threshold value, starting an alarm device to act; and the size of the leak is inferred from the amount of replacement liquid introduced into the closed conduit per unit time.
3. The method of claim 2, wherein: when the heating device heats the liquid temperature of the pipeline to be equal to the ambient temperature, the pressure gradient value in the pipeline is measured, a relation graph of the pressure gradient value dp/dt and time is drawn, and the size of leakage is determined in an auxiliary mode.
4. The method of claim 3, wherein: the counter is a sensor that includes a flow rate measurement and a pressure measurement.
5. The method of claim 4, wherein: when leakage is judged, the positioning of a leakage point is executed, and the position of the leakage point is judged by respectively detecting the change of pressure waves at different times according to the sensors arranged at the two ends of the pipeline; determining the propagation speed of the pressure wave, and positioning a leakage point according to the time difference of the negative pressure wave transmitted to the sensor by the following formula;
wherein X is the distance between the leakage point and the head end monitoring point, L is the length of the pipeline between the two monitoring points, v is the propagation velocity of pressure wave, v is1The propagation speed of the oil product is shown, and delta t is the time difference of pressure waves received by the sensors at the head end and the tail end; wherein L, v1And determining the propagation speed of the pressure wave and the time difference of the two sensors monitoring the pressure wave signals for known quantity, and determining the position of the leakage point.
6. The method of claim 5, wherein: signal extraction for pressure sensors involves the extraction of abrupt or transient features of the signal using multi-scale functions in wavelet transforms.
7. The method of claim 6, wherein: the method comprises the steps of determining the position of a leakage point, detecting inflow and outflow flows at a plurality of point positions in the pipeline, then integrating information to establish a flow balance graph line, and judging the position of the leakage point of the pipeline according to the change of the graph line.
8. An electronic device, comprising: comprising a processor and a memory, said memory having stored therein instructions that are loaded and executed by the processor to implement the method of any of claims 1 to 7.
9. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the method according to any one of claims 1 to 7.
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| CN116557793A (en) * | 2023-07-10 | 2023-08-08 | 中建安装集团有限公司 | System and method for monitoring running state of heat supply pipeline integrating pressure sensing and temperature sensing |
| CN117073933A (en) * | 2023-10-16 | 2023-11-17 | 西安米特电子科技有限公司 | Pipeline pressure monitoring method and system for gas pipe network |
| CN117390896A (en) * | 2023-12-11 | 2024-01-12 | 广东远景信息科技有限公司 | Chemical leakage detection construction method and device based on data model |
| CN117404072A (en) * | 2023-12-15 | 2024-01-16 | 山东新云鹏电气有限公司 | Drilling site management system based on artificial intelligence |
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| CN117073933B (en) * | 2023-10-16 | 2024-01-05 | 西安米特电子科技有限公司 | Pipeline pressure monitoring method and system for gas pipe network |
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| CN117404072A (en) * | 2023-12-15 | 2024-01-16 | 山东新云鹏电气有限公司 | Drilling site management system based on artificial intelligence |
| CN117404072B (en) * | 2023-12-15 | 2024-02-23 | 山东新云鹏电气有限公司 | Drilling site management system based on artificial intelligence |
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