Fault safety monitoring system for double-loop induction optical fiber multi-parameter coupling equipment

Abstract

The invention relates to the technical field of petrochemical equipment fault detection, and particularly discloses a double-loop sensing optical fiber multi-parameter coupling equipment fault safety monitoring system, which comprises an information acquisition unit, a double-loop communication optical fiber, a photoelectric conversion decoder, an analysis processing device and a terminal cabinet, the optical fiber power amplifier sensor comprises a resonator shell and an end cover, a sensing element fixing rod is arranged on the end cover, a string wire connecting plate is connected to the end of the sensing element fixing rod, a string wire fixing frame is arranged at the other end of the resonator shell, and a plurality of framework strings are connected between the string wire connecting plate and the string wire fixing frame. An induction string wire is wound on the frustum-shaped string frame; according to the invention, in the continuous and safe production process of petrochemical engineering field equipment, the problem that the error of the final detection result is large due to weak signal source when the distributed optical fiber adopts non-contact detection is effectively solved, and the reliability of the whole monitoring system is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of petrochemical equipment fault detection, and specifically discloses a dual-loop induction fiber optic multi-parameter coupling equipment fault safety monitoring system. Background Art

[0002] For the on-site of petrochemical production plants, due to special fire prevention and explosion protection requirements, there are special regulations and requirements for the safety of various equipment that can enter the site, and the electrical explosion protection regulations must be met. However, there are a large number of rotating equipment in the petrochemical production site. The operation of these equipment will always have a certain degree of fatigue and wear, and there is a certain service life. There will be a risk of damage within a certain period. Timely detecting the damaged rotating equipment and performing repairs is the key to ensuring the continuous and safe production of petrochemical plants.

[0003] Traditionally, for the monitoring of on-site rotating equipment, corresponding monitoring means are usually arranged according to the importance of the rotating equipment. For example, a temperature sensor is set at the output shaft of the pump to detect the temperature of the bearing, and a noise sensor is installed near the pump to detect the running noise of the pump. Such traditional monitoring means are not only complex, the cost of the system is very high, but also require professional technical personnel for management.

[0004] In addition, currently, distributed optical fibers are also used to detect the operating state of rotating equipment. For example, the invention application with the application number 202310370524.9 discloses a measurement system and method based on a distributed optical fiber acoustic wave sensor, including: a measured object, on which a plurality of measurement points are uniformly arranged for obtaining acoustic excitation; an optical fiber cable, which is installed closely to the measured object and serially connects all the measurement points for receiving the reflected acoustic wave signals radiated by the propagation of the acoustic excitation in the measured object; a signal processing device, which is connected to the optical fiber cable for measuring each measurement point event by real-time detecting the vibration information in the acoustic wave reflection signal. When using distributed optical fibers to detect an object, the invention disclosed has the following deficiencies: First, the optical fiber cable needs to be in contact with the object to detect the wave signal; second, it is impossible to detect other states of the equipment, such as temperature and vibration; third, the signal precise measurement accuracy and reliability are low, and the false alarm rate is high; fourth, there are a large number and types of equipment in the petrochemical production site, and it is impossible to detect the various operating states of all equipment. Therefore, in view of the technical problems and deficiencies existing in the traditional monitoring means and the existing use of distributed optical fibers to monitor the object state, the present application proposes a dual-loop induction fiber optic multi-parameter coupling equipment fault safety monitoring system. Summary of the Invention

[0005] The object of the present invention is to provide a dual-loop inductive optical fiber multi-parameter coupling equipment fault safety monitoring system to solve the technical problems and deficiencies existing in traditional monitoring means and the existing use of distributed optical fibers to monitor the state of equipment and objects at petrochemical production sites.

[0006] The present invention is achieved through the following technical solutions: A dual-loop inductive optical fiber multi-parameter coupling equipment fault safety monitoring system includes: An information acquisition unit for real-time acquisition of various state information of the equipment; A dual-loop communication optical fiber for transmitting the acquired state information; An optoelectronic conversion decoder for converting the transmitted state information; An analysis and processing device for analyzing and processing the converted information; A terminal cabinet for receiving the results of analysis and processing and performing alarm and control; The information acquisition unit includes a vertical pole, on which an optical fiber power amplifier sensor for acquiring information of the equipment is provided. The optical fiber power amplifier sensor includes a resonance box housing, one end of the resonance box housing is provided with an end cover, and an induction element fixing rod extending into the resonance box housing is provided on the end cover. A string wire connecting plate is connected to the end of the induction element fixing rod. A string wire fixing frame is provided at the other end of the resonance box housing. A plurality of skeleton strings are circumferentially and evenly connected between the string wire connecting plate and the string wire fixing frame to form a frustum-shaped string frame. An induction string wire for information acquisition is wound around the outside of the frustum-shaped string frame, and both ends of the induction string wire extending out of the resonance box housing are connected to the dual-loop communication optical fiber.

[0007] As a further setting of the above solution, a plurality of the information acquisition units are provided, which are respectively used for independently detecting different equipment at the production site.

[0008] As a further setting of the above solution, three induction string wires are provided, which are respectively a temperature induction optical fiber for temperature measurement, an acoustic wave induction optical fiber for noise measurement, and a vibration induction optical fiber for vibration measurement.

[0009] As a further setting of the above solution, the three induction string wires are respectively wound around different positions on the frustum-shaped string frame in a staggered manner or the three induction string wires are wound around the frustum-shaped string frame side by side.

[0010] As a further setting of the above solution, a tension adjusting nut screwed to the induction element fixing rod is provided on the outer side of the end cover, and the induction string wire is stretched and wound around the frustum-shaped string frame.

[0011] As a further setting of the above solution, the skeleton string is one of a rod body or a flexible wire rope.

[0012] As a further setting of the above solution, both the resonance box housing and the end cover are made of anti-magnetic materials.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The monitoring system disclosed by the present invention uses a specially designed fiber optic power amplifier sensor to perform non-contact acquisition on the equipment at the petrochemical production site, and then uses a double-loop communication optical fiber to transmit the information. After information conversion, analysis and processing, temperature, vibration, noise and other multi-faceted information of the detected equipment can be obtained in real time. Then, based on the multi-faceted information data, the operating state of the equipment can be accurately judged, so that the monitoring of the fault risk can be carried out in terms of location, fault type, quantity and time, effectively ensuring the continuous and safe production of the equipment at the petrochemical site.

[0014] The fiber optic power amplifier sensor in the present invention adopts a special string drum structure design. Through this structure design, the vibration and noise transmitted from the detected equipment can be amplified inside the resonance box housing, and then the amplified information is collected by the corresponding sensing optical fiber. At the same time, one end of the fiber optic power amplifier sensor for receiving signals is designed to open in a horn shape, and the sensing optical fiber forms multiple "string cloths" on the frustum-shaped string frame. When the signal wave encounters the "string cloth" woven by the sensing optical fiber, reflection will occur, so that a signal wave will be reflected multiple times inside the string wire sensing element to amplify the signal. In addition, the temperature on the detected equipment is amplified by the signal superposition of the multi-turn wound sensing string wire. Combining the above functions, this fiber optic power amplifier sensor can effectively amplify and collect information such as the noise, vibration and temperature of the equipment, effectively solving the problem that the final detection result has a large error due to the weak signal source when the existing distributed optical fiber adopts non-contact detection, and improving the reliability of the entire monitoring system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 It is a schematic connection structure diagram of the monitoring system of the present invention; Figure 2 It is a schematic plan view of the information acquisition unit in the present invention when monitoring a pump; Figure 3 It is a schematic plan view of the information acquisition unit in the present invention when monitoring static equipment; Figure 4Schematic diagram of the internal planar structure of the optical fiber power amplifier sensor of the present invention; Figure 5 This is a schematic diagram of the structure of the present invention in which a small amount of induction string is wound on a pyramid-shaped string frame; Figure 6 This is a side structural diagram of a large number of induction strings wound on a pyramid-shaped string frame in the present invention. DETAILED DESCRIPTION

[0017] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0018] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. Figures 1 - 6 , and describes the application in detail with reference to embodiments. Example 1

[0019] Example 1 discloses a dual-loop inductive optical fiber multi-parameter coupling device fault safety monitoring system, see the attached Figures 1 - 3 The system comprises an information acquisition unit 100 for detecting equipment or objects at a petrochemical production site, a dual-circuit communication optical fiber 200, an optoelectronic conversion decoder 300, an analysis and processing device 400, and a terminal cabinet 500. The specific number of information acquisition units 100 is set according to the number of detection equipment required on site. Each unit is then connected to the two optical fiber loops of the dual-circuit communication optical fiber 200, which is then connected to the port of the optoelectronic conversion decoder 300. The dual-circuit design allows for mutual correction and solves the problem of monitoring continuity after an optical fiber short circuit. The data processed by the optoelectronic conversion decoder 300 is then analyzed and processed by the analysis and processing device 400, and finally displayed by the terminal cabinet 500, which can also perform corresponding alarms and remote control.

[0020] The information collection unit 100 includes a pole 1 fixed near a device or object, and a fiber optic power amplifier sensor 2 is arranged on the pole 1 and is arranged toward the device or object. The pole 1 not only fixes the sensor, but also transmits the vibration of the device to the sensor so that it receives vibration information. In the specific design, one or more poles 1 and fiber optic power amplifier sensors 2 can be set accordingly so that the monitoring range can cover the entire device or object. Figure 2There are two vertical poles 1 and fiber optic power amplifier sensors 2, which detect the pump 3 from two angles; attached Figure 3 There is one vertical pole 1 and fiber optic power amplifier sensor 2, which detects the flange leakage point of the static equipment 4 from a more appropriate angle.

[0021] Refer to attached Figures 4 - 6 , the fiber optic power amplifier sensor 2 includes a resonance box housing 201 made of non-magnetic material. The resonance box housing 201 is in the shape of a drum-shaped cylinder. One end of the resonance box housing 201 is provided with an end cap 202 also made of non-magnetic material. At the center of the end cap, there is an induction element fixing rod 203 extending into the resonance box housing 201. And the outer end of the induction element fixing rod 203 is connected to the vertical pole 1, so that the vibration signal of the equipment or object can be transmitted to the resonance box housing 201 through the vertical pole and the induction element fixing rod. At the inner end of the induction element fixing rod 203, there is a string wire connecting plate 204. At the other end of the resonance box housing 201, there is a string wire fixing frame 205 clamped or screwed. And the string wire connecting plate 204 and the string wire fixing frame 205 are concentrically arranged along the central axis of the resonance box housing 201. Then, a plurality of skeleton strings 206 are circumferentially and evenly connected between the string wire connecting plate 204 and the string wire fixing frame 205. In specific design, the skeleton string 206 can be a slender rod or a flexible wire rope. Then, a tension adjusting nut 208 screwed with the induction element fixing rod 203 is also provided on the outer side of the end cap 202. By pulling the string wire connecting plate 204 backward through the tension adjusting nut 208, all the skeleton strings 206 are pulled to be straightened, thus forming a regular multi-sided frustum-shaped string frame.

[0022] The fiber optic power amplifier sensor 2 further includes an induction string wire 207 stretched and wound around the frustum-shaped string frame (i.e., all the skeleton strings 206). The induction string wire 207 is a sensing optical fiber for detecting various signals. In specific design, in order to detect multiple state parameters of various equipment or objects, three induction string wires 207 are provided in this embodiment. One is a temperature sensing optical fiber 2071 for temperature measurement, one is a vibration sensing optical fiber 2072 for vibration measurement, and the other is an acoustic wave sensing optical fiber 2073 for noise measurement. The three induction string wires 207 can be respectively staggered and wound at different positions on the frustum-shaped string frame, thus forming three independent tower spring-like induction string wires; or the three induction string wires 207 can be wound side by side to form three stacked tower spring-like induction string wires. Then, both ends of the three induction string wires 207 extend out of the resonance box housing 201 and are connected to the double-loop communication optical fiber 200.

[0023] When the induction string 207 is wound around the frustum-shaped string frame, one of its side surfaces is trapezoidal, and in the middle is a "string cloth" composed of densely arranged induction strings 207. At the same time, since the winding diameter of the induction string 207 changes with the conical position, the suspended length of the induction string 207 (i.e., the straight length set between two adjacent skeleton strings 206) also changes uniformly. Therefore, the resonance frequency of the induction string 207 changes continuously and has a very large frequency bandwidth, which is beneficial to measuring various signal waves.

[0024] The inner cavity of the resonance box housing 201 is divided into a resonance box front cavity 2011 and a resonance box rear cavity 2012 by the "string cloth" on multiple side surfaces of the frustum-shaped string frame. The resonance box front cavity 2011 is designed with a flared opening. When the source signal (including vibration and noise) enters the sensor, it will first enter the resonance box front cavity 2011. At this time, a part of the source signal will act on the induction string 207 and be reflected, and then be focused at the bottom to strengthen the signal source; the other part of the source signal will enter the resonance box rear cavity 2012 through the gaps between the induction strings 207, and then the resonance box rear cavity 2012 will amplify the incoming source signal to strengthen the signal acquisition of the induction string 504, so as to achieve the effect of information amplification. In addition, when collecting temperature signals, on the one hand, the flared opening design inside the sensor can gather more temperature information on the device or object, and on the other hand, the signal is superimposed through the temperature induction optical fiber 2071 wound in multiple turns, so that the collected temperature signal can be amplified.

[0025] When the optical fiber power amplifier sensor 2 in this embodiment collects information on equipment or objects at the petrochemical site, under normal circumstances, the noise, vibration, and its own temperature generated by the equipment or object will be in a relatively stable state or a state of normal change trend for a long time. Once the equipment or object has an abnormality, it will inevitably be accompanied by changes in states such as vibration, noise, and temperature. The optical fiber power amplifier sensor 2 can quickly diagnose the corresponding faults by collecting the above information. When a petrochemical production equipment fails, its relevant state parameters will change similar to those in Table 1 (Fault Detection Information Feature Table for Pump Equipment) below. The fault information and state parameters of other specific equipment are not all listed, and the corresponding fault types can be judged through the changes in the above state parameters.

[0026] Table 1: Fault Detection Information Feature Table for Pump Equipment

[0027] Taking the bearing damage in Table 1 above as an example, the noise, vibration, and temperature will all increase. However, when characteristic frequencies appear in the vibration, the three induction strings 207 in the fiber optic power amplifier sensor 2 can collect and amplify the above signals. Then, the dual-loop communication optical fiber 200 transports the collected information to the optoelectronic conversion decoder for processing. After that, the processed data is analyzed and judged by the analysis and processing device 400, and finally, it is displayed by the terminal cabinet 500 and corresponding alarms and remote controls can be carried out.

[0028] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A fault-safe monitoring system for a dual-loop inductive optical fiber multi-parameter coupling device, characterized in that, include: Information collection unit, used to collect various status information of the equipment in real time; Dual-loop communication optical fiber, used to transmit the collected status information; Photoelectric conversion decoder, used to convert the transmitted status information; an analysis and processing device for analyzing and processing the converted information; Terminal cabinet, used to receive the results of analysis and processing, and to perform alarm and control; The information collection unit includes a vertical pole, on which a fiber optic power amplifier sensor for collecting information from the equipment is provided. The fiber optic power amplifier sensor includes a resonance box shell, one end of the resonance box shell is provided with an end cover, and the end cover is provided with a sensing element fixing rod extending into the resonance box shell, the end of the sensing element fixing rod is connected to a string connecting plate, and the other end of the resonance box shell is provided with a string fixing frame, a plurality of skeleton strings are evenly connected circumferentially between the string connecting plate and the string fixing frame to form a prism-shaped string frame, and the outer periphery of the prism-shaped string frame is surrounded by sensing strings for information collection, and the sensing strings extend out of both ends of the resonance box shell and are connected to the dual-loop communication optical fiber.

2. The fault-safe monitoring system for a dual-loop inductive fiber multi-parameter coupling device according to claim 1, characterized in that, There are multiple information collection units, each used to independently detect different equipment on the production site.

3. The dual-loop inductive optical fiber multi-parameter coupling device fault safety monitoring system according to claim 1, characterized in that, The inductive strings are provided with three, namely a temperature inductive optical fiber for measuring temperature, a sound wave inductive optical fiber for measuring noise, and a vibration inductive optical fiber for measuring vibration.

4. The fault-safe monitoring system for a dual-loop inductive optical fiber multi-parameter coupling device according to claim 3, characterized in that, The three induction strings are staggered and wound at different positions on the pyramid-shaped string frame, or the three induction strings are wound side by side on the pyramid-shaped string frame.

5. The fail-safe monitoring system for a dual-loop inductive fiber multi-parameter coupling device according to any one of claims 1-4, characterized in that, The outer side surface of the end cover is provided with a tension adjustment nut which is screwed to the fixing rod of the induction element. The induction string is straightly wound on the prism-shaped string frame.

6. The fault-safe monitoring system for a dual-loop inductive optical fiber multi-parameter coupling device according to claim 5, characterized in that, The skeleton string is a rod or a flexible wire rope.

7. The fault-safe monitoring system for a dual-loop inductive fiber optic multi-parameter coupling device according to claim 1, characterized in that, The resonance box shell and the end cover are both made of anti-magnetic material.

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