Cable well groove online monitoring and environment optimization method and system

Abstract

The invention relates to an online monitoring and environment optimization method and system for a cable well trench, and belongs to the technical field of program control or liquid level control. The system mainly comprises a controller, a water level measurement module, a toxic and explosive gas detection module, a laser scanning module, a data transmission module and a water pump and fan pump set module. By installing a movable sliding rail and a laser scanner, real-time monitoring of water level distribution in the cable well trench is achieved, the hidden danger of water accumulation is found in time, and drainage measures are taken; the concentration of poisonous and explosive gas in the cable well trench is detected in real time, gas accumulation hidden danger is found in time, and ventilation equipment is started; the control module evaluates the environment in the cable well trench in a grading mode according to key parameters such as the liquid level and the gas concentration, ventilation equipment and drainage equipment are started in a targeted mode, the cable operation environment is comprehensively monitored through a temperature sensor, a humidity sensor and the like, and a guarantee is provided for safe operation of the cable. Automatic monitoring of the environment in the cable well trench in the explosive area of the waste incineration power plant is achieved, and the working efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of program control or liquid level control, and relates to a method and system for on-line monitoring and environmental optimization of cable trenches, in particular to a method and system for on-line monitoring and environmental optimization of cable trenches applicable to explosive areas of waste incineration power plants. Background Art

[0002] With the acceleration of the urbanization process and the rapid development of the waste incineration power generation industry, cables are widely used in waste incineration power plants, and a large number of cable trenches are installed. As a confined space, cable trenches have problems such as poor ventilation, which is prone to the accumulation of toxic and harmful gases (such as hydrogen sulfide) and flammable gases, leading to problems such as hypoxia or explosion; and poor drainage in the space, making it easy for liquids to accumulate. However, the harsh operating environment in the cable trenches is likely to cause corrosive damage to the cables, affecting the service life of the cables. In the prior art, the monitoring means for the environment in the cable trenches are single, relying only on manual inspections or simple sensors, and it is impossible to comprehensively and accurately obtain key parameter data such as the depth of accumulated water and gas concentration, making it difficult to comprehensively evaluate and classify and control the environmental conditions. The operating mode of traditional ventilation and drainage equipment is relatively passive and cannot be automatically adjusted according to actual needs, and both the efficiency and energy consumption are not ideal.

[0003] Patent CN206696656U discloses an on-line monitoring system for cable trenches, including a central processor, an optical fiber temperature sensor, a partial discharge signal processor, etc. This system automatically monitors the temperature of the cables in the cable trenches, the layout discharge signals and temperatures of the cable interfaces, as well as the temperature, combustible gas concentration and environmental temperature in the cable trenches. However, this patent still has the problem that it cannot monitor the water level distribution in the cable trenches in real time. Patent CN214748156U discloses an internal detection system for cable wells, including a temperature and humidity sensor, a water level sensor, a cable partial discharge monitoring device, etc., which can transmit monitoring data over a long distance and can drain the accumulated water in the cable wells in a timely manner. However, this patent still has the problem that it cannot detect and analyze the toxic and harmful gases in the cable trenches in real time.

[0004] Currently, the prior art has the following disadvantages: It is impossible to monitor the water level distribution in the cable trenches in real time, making it difficult to discover potential water accumulation hazards in a timely manner and take corresponding measures; it is impossible to detect and analyze the toxic and harmful gases in the cable trenches in real time, and it is impossible to discover potential gas accumulation hazards in a timely manner and take ventilation measures; there is a lack of a comprehensive evaluation mechanism for the environment in the cable trenches, and it is impossible to classify and evaluate the environment according to key parameters such as liquid level and gas concentration and conduct targeted optimization; it is impossible to achieve automatic monitoring and optimization of the environment in the cable trenches, and manual inspections and manual operations are still required, resulting in low efficiency; it is impossible to monitor the environmental parameters such as temperature and humidity in the cable trenches in real time, making it difficult to comprehensively understand the cable operating environment.

[0005] Therefore, it is urgent to propose a new type of cable trench online monitoring and environmental optimization system, which can monitor the key parameters such as liquid level and gas concentration in the cable trench in real time through automated means, conduct graded assessment of the environment based on the monitoring data to start ventilation and drainage equipment in a targeted manner, and automatically adjust the operation mode of ventilation and drainage equipment according to actual needs to ensure a safe operating environment in the cable trench, effectively avoid damage to the cable by corrosive media, extend the service life of the cable, and realize intelligent management of the environment in the cable trench. Summary of the invention

[0006] In view of the problems in the prior art such as the inability to monitor the water level distribution in the cable trench in real time, the inability to detect and analyze the toxic and harmful gases in the cable trench in real time, and the lack of a comprehensive evaluation mechanism for the environment in the cable trench, etc. Therefore, in order to solve the above problems, the purpose of the present invention is to provide a cable trench online monitoring and environmental optimization system.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A method for online monitoring and environmental optimization of a cable well trench, comprising the following steps:

[0009] Step 1: Collect environmental data in the cable trench;

[0010] Step 2: Analyze and process the collected environmental data;

[0011] Step 3, determine whether there are hidden dangers in the cable trench environment, if yes, return to step 1, if no, go to step 4;

[0012] Step 4: Optimize the environment in the cable trench based on the analysis results.

[0013] Further, the step 1 comprises:

[0014] Step 1.1, using a distributed capacitance water level meter to detect the amount of liquid accumulated in the cable well in real time to obtain liquid level data;

[0015] Step 1.2, using a toxic and harmful gas detection device to detect the concentration of toxic and explosive gases generated by the leachate during the fermentation period in real time to obtain gas concentration data;

[0016] Step 1.3: Install a movable slide rail on the top of the cable trench, install the laser scanner on the slide rail, and move the laser scanner through the slide rail to achieve imaging of the cable trench and obtain water level distribution image data.

[0017] Further, the step 2 comprises:

[0018] Step 2.1, transmitting the liquid level data, gas concentration data, and water level distribution image data to the controller;

[0019] Step 2.2: Based on the liquid level and gas concentration in the well trench, the controller uses a simulation algorithm to define the environment in the cable trench well as different safety levels on the imaging interface of the cable trench well;

[0020] Step 2.3: Divide the safety levels into a dangerous area, a warning area, and a safe area;

[0021] Furthermore, in the said Step 2.3:

[0022] If the accumulated water in the cable well is in the high water level range and the gas concentration is in the high to medium range, it is defined as a dangerous area and marked in red; if the accumulated water in the cable well is in the medium water level range and the gas concentration is in the medium to low range, it is defined as a warning area and marked in yellow; if the accumulated water in the cable well is in the low water level range, the gas concentration is in the low range, and the temperature is in the low value range, it is defined as a safe area and marked in blue.

[0023] Furthermore, the said Step 4 includes:

[0024] Step 4.1: According to the environmental safety level signal in the well trench, timely start the fan to ventilate the gas in the cable well trench;

[0025] Step 4.2: According to the environmental safety level signal in the well trench, timely start the pump group to remove the liquid in the cable well trench.

[0026] An on-line monitoring and environmental optimization system for a cable well trench, comprising:

[0027] An uninterruptible power supply, providing stable power for the entire system;

[0028] A controller, receiving liquid level data, gas concentration data, and water level distribution image data, and uploading the data to the central control interface of the power plant distributed control system through a core switch and a wireless router to monitor the environment of the cable well trench in real time;

[0029] A core detection module connected to the controller through an isolator, including a water level probe, a CO probe, a CH 4 probe, and a temperature probe, for real-time monitoring of the environmental parameters in the cable well trench;

[0030] An explosion-proof water pump group for pumping out the accumulated water in the cable well trench; an explosion-proof fan group for controlling the ventilation and air change in the cable well trench;

[0031] A water level measurement module, which uses a distributed capacitance water level gauge to real-time monitor the liquid volume in the cable well and obtain liquid level data;

[0032] A toxic and explosive gas detection module, which uses a toxic and harmful gas detection device to real-time detect the concentration of toxic and explosive gases generated during the fermentation of leachate to obtain gas concentration data;

[0033] A laser scanning module, by installing a moving slide rail on the top of the cable trench, installing a laser scanner on the slide rail, and driving the laser scanner to move through the slide rail, realizes imaging of the cable trench and obtains water level distribution image data.

[0034] The controller, the water pump and fan pump group module, according to the environmental safety level signal in the trench, timely starts the fan to ventilate the gas in the cable trench or starts the water pump group to remove the liquid in the cable trench.

[0035] Further, the water level measurement module adopts a distributed capacitance water level gauge, with a measurement range of 0 - 500 mm, an accuracy of ±1 mm, a working temperature of 20 - 80 °C, the outer shell of the water level gauge is made of 316L stainless steel, measures the capacitance difference between the measured liquid and the water level measurement module, and is installed inside a tube and inserted into the internal sump of the cable trench in a suspended direct insertion installation method.

[0036] Further, the toxic and explosive gas detection module adopts an infrared gas detector, with a detection range of 0% - 100% LEL, a resolution of 1% LEL, a working temperature of -20 - 60 °C, and the gas detector is connected to the controller through a wireless network and transmits the gas concentration data in the cable trench to the controller every 5 seconds.

[0037] Further, the laser scanning module adopts a two-dimensional laser scanner, with a scanning range of 180 degrees, a scanning accuracy of ±1 mm, a scanning frequency of 10 Hz, and the laser scanner is connected to the controller through an industrial Ethernet and transmits the water level distribution image data in the cable trench to the controller every 10 seconds.

[0038] Further, the controller is an industrial-grade PLC controller. The controller, through an analog algorithm, defines the environment in the cable trench as different safety levels on the DCS cable trench imaging interface according to the liquid level and gas concentration in the trench. These safety levels include a danger zone, a warning zone, and a safety zone.

[0039] The beneficial effects of the present invention are as follows:

[0040] By installing a moving slide rail and a laser scanner, real-time monitoring of the water level distribution in the cable trench is realized, potential water accumulation hazards can be discovered in time and drainage measures can be taken; equipped with a toxic and explosive gas detection module, real-time detection of methane, CO, H in the cable trench 2S and other toxic and explosive gas concentrations, promptly discover hidden dangers of gas accumulation and start ventilation equipment; the control module conducts graded assessment of the environment in the cable trench according to key parameters such as liquid level and gas concentration, and starts ventilation and drainage equipment in a targeted manner to achieve automated optimization of the environment; it achieves automated monitoring and optimization of the environment in the cable trench, without the need for manual inspections and manual operations, thus improving work efficiency; through sensors such as temperature and humidity, it comprehensively monitors the cable operating environment to provide protection for the safe operation of the cable.

[0041] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0043] Figure 1 A schematic diagram of a cable well trench online monitoring and environmental optimization system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0044] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0045] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0046] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the accompanying drawings are only for illustrative purposes and cannot be construed as a limitation of the present invention. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0047] The present invention provides a method for on-line monitoring and environmental optimization of cable trench and manhole, including:

[0048] Step 1: Collect environmental data in the cable trench and manhole;

[0049] Step 2: Analyze and process the collected environmental data;

[0050] Step 3: Judge whether there are potential hazards in the environment of the cable trench and manhole. If so, return to Step 1; if not, execute Step 4;

[0051] Step 4: Optimize the environment in the cable trench and manhole according to the analysis results.

[0052] Step 1 includes:

[0053] Step 1.1: Use a distributed capacitance water level gauge to detect the liquid accumulation in the cable manhole in real time to obtain liquid level data;

[0054] Step 1.2: Use a toxic and harmful gas detection device to detect the concentrations of toxic and explosive gases such as methane, CO, H 2 S, etc. generated during the fermentation of leachate in real time to obtain gas concentration data;

[0055] Step 1.3: Install a mobile slide rail at the top of the cable trench and manhole, install a laser scanner on the slide rail, and drive the laser scanner to move through the slide rail to realize imaging of the cable trench and manhole to obtain water level distribution image data.

[0056] Step 2 includes:

[0057] Step 2.1: Transmit the liquid level data, gas concentration data, and water level distribution image data to the controller;

[0058] Step 2.2: The controller uses a simulation algorithm to define the environment in the cable trench and manhole as different safety levels on the imaging interface of the cable trench and manhole based on the liquid level and gas concentration in the trench and manhole;

[0059] Step 2.3: The safety levels can be divided into dangerous area, warning area, and safe area, specifically including: If the accumulated water in the cable shaft is in the high water level range and the gas concentration is in the high to medium range, it is defined as a dangerous area and marked in red; if the accumulated water in the cable shaft is in the medium water level range and the gas concentration is in the medium to low range, it is defined as a warning area and marked in yellow; if the accumulated water in the cable shaft is in the low water level range, the gas concentration is in the low range, and the temperature is in the low value range, it is defined as a safe area and marked in blue.

[0060] Step 4 includes:

[0061] Step 4.1: According to the environmental safety level signal in the well trench, start the fan in a timely manner to ventilate the gas in the cable shaft trench.

[0062] Step 4.2: According to the environmental safety level signal in the well trench, start the pump set in a timely manner to remove the liquid in the cable shaft trench, improve the environment in the cable shaft trench, avoid damage to the cables in the well trench by corrosive media in the harsh operating environment, ensure the environmental safety in the well trench is under control, and extend the service life of the cables.

[0063] Please refer to Figure 1 , which is a schematic diagram of the on-line monitoring and environmental optimization system for the cable shaft trench in the embodiment of the present invention. The system includes: an uninterruptible power supply to provide stable power for the entire system; a controller, which is the core control unit of the system; the core detection module is connected to the controller through an isolator, and includes a water level probe, a CO probe, a CH 4 probe and a temperature probe, which are used to monitor the environmental parameters in the cable shaft trench in real time; an explosion-proof water pump set, a laser scanning module, and an explosion-proof fan set. The system monitors potential safety hazards such as accumulated water, abnormal toxic gas concentration, and abnormal temperature by collecting the environmental data in the cable shaft trench in real time. Once an abnormality is detected, the system will automatically start the corresponding protection devices, such as pumping water, ventilation, etc., so as to optimize the environment of the cable shaft trench and ensure the safety of equipment and personnel. At the same time, the system can also wirelessly transmit the detection data to the upper computer through the data transmission module to achieve remote monitoring and data management. The design of the system fully considers the special environment of the explosive area in the waste incineration power plant, and all components are designed with explosion-proof type, with good reliability and safety performance, and are suitable for the environmental monitoring and optimization requirements of such occasions. The system also includes a water level measurement module, a toxic and explosive gas detection module, and a water pump and fan pump set module.

[0064] The water level measurement module detects the liquid volume in the cable shaft in real time through a distributed capacitance water level gauge to obtain the liquid level data. Specifically, a distributed capacitance water level gauge is used, with a measurement range of 0 - 500 mm, an accuracy of ±1 mm, and a working temperature of -20 - 80 °C. The capacitance water level gauge is connected to the controller through a cable and transmits the liquid level data in the cable shaft to the controller every 1 second.

[0065] The liquid level gauge housing is made of 316L stainless steel. It uses the capacitance difference between the measured liquid and the water level measurement module as the measurement basis. It is installed inside a tube (a sleeve outside the water level gauge probe), and is inserted into the sump inside the cable well in a suspended and direct insertion installation method, which can effectively avoid interference signals such as water mist. It can detect the water level in real time. The top of the tube is equipped with an electromagnetic liquid level gauge probe, which adsorbs and releases through an electromagnet. Online calibration can be carried out using its height difference. The measurement period is 0.1 second and the accuracy is 1 mm. Methane, CO, H 2 S and other toxic and explosive gases are extracted by an air pump. The sampling pipeline is arranged in upper and lower layers according to the gas density to reduce sampling errors. The required gases are extracted to a safe area for detection. Different areas use solenoid valves to switch the air extraction to the detection module. The single-point detection takes 3 minutes each time. This method can customize the detection period according to the number of sampling pipelines in the detected area, and can reduce the corrosion and damage of corrosive gases to the measurement module, and improve the service life of the gas detection module.

[0066] Toxic and explosive gas detection module, which can detect the concentrations of methane, CO, H 2 S and other toxic and explosive gases generated during the fermentation of leachate in real time through a toxic and harmful gas detection device, and obtain gas concentration data. Specifically, an infrared gas detector is used, with a detection range of 0% - 100% LEL, a resolution of 1% LEL, and an operating temperature of -20 - 60°C. The gas detector is connected to the controller through a wireless network, and transmits the gas concentration data in the cable well to the controller every 5 seconds.

[0067] A moving slide rail is installed on the top of the cable trench. The laser scanner is installed on the slide rail. The slide rail drives the laser scanner to move to achieve imaging of the cable trench and obtain water level distribution image data. Specifically, a two-dimensional laser scanner is used, with a scanning range of 180 degrees, a scanning accuracy of ±1 mm, and a scanning frequency of 10 Hz. The laser scanner is connected to the controller through an industrial Ethernet, and transmits the water level distribution image data in the cable well to the controller every 10 seconds.

[0068] The controller receives the liquid level data, gas concentration data, and water level distribution image data and uploads them to the central control interface of the power plant's Distributed Control System (DCS) to monitor the environment of the cable trench in real time. The DCS is a new type of control system that integrates advanced computer technology, communication technology, CRT technology, and control technology, namely the 4C technology, based on microcomputer processing, with the characteristics of decentralized control of hazards, centralized operation, and management. The concept of the DCS system is "decentralized control" and "centralized management", which is an automated control system that tries to disperse the risks caused by control and centralize the management and display functions.

[0069] The controller adopted in this embodiment is an industrial-grade PLC controller, which has powerful data processing capabilities and analog algorithm functions.

[0070] Based on the liquid level and gas concentration in the well trench, the controller uses an analog algorithm to define the environment in the cable trench well as different safety levels on the imaging interface of the DCS cable trench well.

[0071] These safety levels can be divided into dangerous areas, warning areas, and safe areas, specifically including:

[0072] If the accumulated water in the cable well is in the high water level range exceeding 250 mm, or the gas concentration is in the high and medium range higher than 80% of the Lower Explosion Limit (LEL), it is defined as a dangerous area and marked in red;

[0073] If the accumulated water in the cable well is in the medium water level range of 50 - 250 mm and the gas concentration is lower than 80% LEL;

[0074] If the gas concentration in the cable well is in the medium water level range of 40% - 80% and the accumulated water is lower than 250 mm, it is defined as a warning area and marked in yellow;

[0075] If the accumulated water in the cable well is in the low water level range of 0 - 50 mm, and the gas concentration is in the low range of 0% - 40% LEL, and the temperature is lower than 40 °C, it is defined as a safe area and marked in blue.

[0076] According to the environmental safety level signal in the well trench, the fan in the water pump and fan pump group module is started in a timely manner to ventilate the gas in the cable well trench. When the environmental level is a dangerous area or a warning area, the controller sends a signal to start the fan for ventilation. The fan model adopted in this embodiment is BT35 - 11 - 7.1D, and the air volume is 11000 m 3 / h.

[0077] According to the environmental safety level signal in the well trench, the water pump group in the water pump and fan pump group module is started in a timely manner to remove the liquid in the cable well trench, improve the environment in the cable well trench, prevent the cables in the well trench from being damaged by corrosive media in the harsh operating environment, ensure the safety control of the environment in the well trench, and extend the service life of the cables. When the environmental level is a dangerous area or a warning area, the controller sends a signal to start the submersible pump group for drainage. The water pump group is composed of 2 water wave pumps. The model adopted in this embodiment is QDX1.5 - 32 - 0.75, the head is 32 meters, and the flow rate is 1.5 m 3 / h. Using the water pump group for water level control can achieve controlling the water level at a low value of 50 mm, so that the liquid level is always in a safe area.

[0078] Through the above steps, the present invention realizes the real-time monitoring and automatic optimization of the environment in the cable shaft and trench in the explosion-prone area of the waste incineration power plant, effectively avoids the damage of the cable by corrosive media, ensures the safety and control of the environment in the cable shaft and trench, and thus extends the service life of the cable.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the present technical solution, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A method for online monitoring and environmental optimization of cable trenches, characterized in that: The following steps are involved: Step 1: Collect environmental data in the cable trench; Step 2: Analyze and process the collected environmental data; Step 3, determine whether there are hidden dangers in the cable trench environment, if yes, return to step 1, if no, go to step 4; Step 4: Optimize the environment in the cable trench based on the analysis results.

2. A method for online monitoring and environmental optimization of a cable trench according to claim 1, characterized in that: The step 1 comprises: Step 1.1, using a distributed capacitance water level meter to detect the amount of liquid accumulated in the cable well in real time to obtain liquid level data; Step 1.2, using a toxic and harmful gas detection device to detect the concentration of toxic and explosive gases generated by the leachate during the fermentation period in real time to obtain gas concentration data; Step 1.3: Install a movable slide rail on the top of the cable trench, install the laser scanner on the slide rail, and move the laser scanner through the slide rail to achieve imaging of the cable trench and obtain water level distribution image data.

3. The method of the cable trench online monitoring and environmental optimization system according to claim 1 is characterized in that: The step 2 comprises: Step 2.1, transmitting the liquid level data, gas concentration data, and water level distribution image data to the controller; Step 2.2, the controller defines the environment in the cable trench as different safety levels on the cable trench imaging interface based on the liquid level and gas concentration in the trench through a simulation algorithm; Step 2.3: Divide the safety levels into danger zone, warning zone, and safety zone.

4. The method of the cable trench online monitoring and environmental optimization system according to claim 1 is characterized in that: In step 2.3: If the accumulated water in the cable well is in the high water level range and the gas concentration is in the high and medium range, it is defined as a dangerous area and marked in red; if the accumulated water in the cable well is in the medium water level range and the gas concentration is in the medium and low range, it is defined as a warning area and marked in yellow; if the accumulated water in the cable well is in the low water level range, the gas concentration is in the low range and the temperature is in the low value range, it is defined as a safe area and marked in blue.

5. The method of the cable trench online monitoring and environmental optimization system according to claim 1, characterized in that: The step 4 comprises: Step 4.1, according to the safety level signal of the environment in the trench, start the fan in time to ventilate the gas in the cable trench; Step 4.2: According to the environmental safety level signal in the well trench, start the pump group in time to clear the liquid in the cable well trench.

6. A cable trench online monitoring and environmental optimization system, characterized in that: include: Uninterruptible power supply, providing stable power for the entire system; The controller receives liquid level data, gas concentration data, and water level distribution image data and uploads the data to the central control interface of the power plant distributed control system through the core switch and wireless router to conduct real-time environmental monitoring of the cable well trench; The core detection module connected to the controller through the isolator includes a water level probe, a CO probe, a CH4 probe, and a temperature probe, which is used to monitor the environmental parameters in the cable trench in real time; Explosion-proof water pump set, to pump out the water in the cable trench; explosion-proof fan set, to control the ventilation of the cable trench; The water level measurement module uses a distributed capacitance water level meter to monitor the amount of liquid accumulated in the cable well in real time and obtain liquid level data; The toxic and explosive gas detection module detects the concentration of toxic and explosive gases generated by the leachate during the fermentation period in real time through the toxic and harmful gas detection device to obtain gas concentration data; The laser scanning module is equipped with a movable slide rail at the top of the cable trench, and the laser scanner is installed on the slide rail. The laser scanner is driven to move by the slide rail to realize imaging of the cable trench and obtain water level distribution image data. The controller, the water pump and the fan pump group module start the fan in time to ventilate the gas in the cable well trench, or start the water pump group to clear the liquid in the cable well trench according to the environmental safety level signal in the well trench.

7. A cable trench online monitoring and environmental optimization system according to claim 6, characterized in that: The water level measurement module adopts a distributed capacitance water level meter with a measurement range of 0 to 500 mm, an accuracy of ±1 mm, and an operating temperature of 20 to 80°C. The liquid level meter shell is made of 316L stainless steel. It measures the difference in capacitance between the liquid being measured and the water level measurement module. It is installed in a tube and inserted into the water pit inside the cable well in a suspended direct plug-in installation manner.

8. A cable trench online monitoring and environmental optimization system according to claim 6, characterized in that: The toxic and explosive gas detection module adopts an infrared gas detector with a detection range of 0% to 100% LEL, a resolution of 1% LEL, and an operating temperature of -20 to 60°C. The gas detector is connected to the controller via a wireless network and transmits the gas concentration data in the cable well to the controller every 5 seconds.

9. A cable trench online monitoring and environmental optimization system according to claim 6, characterized in that: The laser scanning module adopts a two-dimensional laser scanner with a scanning range of 180 degrees, a scanning accuracy of ±1mm, and a scanning frequency of 10Hz. The laser scanner is connected to the controller via industrial Ethernet and transmits the water level distribution image data in the cable well to the controller every 10 seconds.

10. A cable trench online monitoring and environmental optimization system according to claim 6, characterized in that: The controller is an industrial-grade PLC controller. The controller uses a simulation algorithm to define the environment in the cable trench into different safety levels on the DCS cable trench imaging interface according to the liquid level and gas concentration in the trench. The safety levels include danger zone, warning zone and safety zone.

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