Pollution leakage monitoring and early warning system for underground facilities of in-production industry and enterprise

Abstract

The utility model discloses an in-production industrial enterprise underground facility pollution leakage monitoring and early warning system which comprises a plurality of early warning wells, and each early warning well comprises a metal well pipe, an optical fiber water quality sensing module, a VOC gas sensor, an ultrasonic water level sensor, a ground controller, a remote early warning signal transmitter and a power supply module. The ground controller is respectively connected with the optical fiber water quality sensing module, the VOC gas sensor, the ultrasonic water level sensor and the remote early warning signal transmitter. The optical fiber is installed through low-disturbance static kill, construction disturbance can be reduced, large-span excavation to underground facilities is not needed, the structure is small and exquisite, construction is easy, and construction disturbance is small; the daily maintenance requirement is small, and long-term operation can be achieved; the system has the advantages that organic pollutants and volatile gas in underground water can be monitored, the monitoring range is comprehensive, the leakage early warning accuracy is high, the sensor early warning result can be integrated into a remote monitoring system, and an operator is allowed to monitor the environment condition within a safe distance.

Description

Technical Field

[0001] The utility model belongs to the technical field of soil and groundwater pollution prevention and control, and in particular relates to a pollution leakage monitoring and early warning system for underground facilities in an industrial enterprise. Background Art

[0002] As soil and groundwater pollution prevention and control efforts progress, strategies are gradually shifting from stock remediation to source control, with the focus shifting from construction and development land to existing industrial land. To implement this "source control" strategy, it is necessary to further strengthen pollution prevention efforts in both existing and newly constructed enterprises, preventing and controlling soil pollution on industrial land at the source, reducing the occurrence and severity of contaminated plots. Monitoring underground facility leaks in existing industrial enterprises is a key tool for implementing this "source control" approach.

[0003] Leak detection technology integrates knowledge from multiple fields and disciplines. Existing leak detection methods vary significantly in their detection methods and technical approaches. A common classification approach is to categorize existing detection and location methods into two main categories: direct monitoring and indirect monitoring. Direct monitoring methods involve entering underground facilities to directly monitor the facility itself, such as ultrasonic, magnetic flux leakage, and video monitoring. Indirect monitoring methods utilize changes in the physical and chemical properties of the surrounding soil, such as resistivity, temperature, dielectric constant, and soil gas content, caused by underground facility leakage to identify leak locations and determine the amount of leakage. These methods include resistivity, ground-penetrating radar, soil gas monitoring, leak monitoring cables, and fiber optic leak detection. Direct monitoring methods can provide detailed quality information for an entire pipeline or storage tank, but they are expensive, require high testing costs, place high demands on the pipeline or tank, and lack continuous, real-time monitoring. They are primarily used for preventative monitoring before underground facility burial and for maintenance monitoring during production interruptions. Indirect monitoring technologies, on the other hand, do not require attachment to or entry into underground facilities, resulting in less disturbance and enabling long-term online monitoring. However, current indirect monitoring technology has problems such as a single monitoring target, a small number of applicable pollution types, and insufficient early warning effects. Underground facility leakage warnings mainly focus on changes in environmental variables and lack early warnings for pollutants. Utility Model Content

[0004] In view of this, the purpose of the present invention is to provide a pollution leakage monitoring and early warning system for underground facilities in industrial enterprises in production, so as to solve the deficiencies in the existing technology.

[0005] In order to achieve the above-mentioned purpose, the present invention is realized by the following technical solutions:

[0006] A pollution leakage monitoring and early warning system for underground facilities in an operating industrial enterprise is provided, which includes several early warning wells. The early warning wells include metal well pipes, optical fiber water quality sensing modules, VOC gas sensors, ultrasonic water level sensors, ground controllers, remote early warning signal transmitters and power supply modules. The ground controllers are respectively connected to the optical fiber water quality sensing modules, the VOC gas sensors, the ultrasonic water level sensors and the remote early warning signal transmitters. The power supply module is responsible for power supply. The metal well pipes are vertically buried underground. The optical fiber water quality sensing modules are arranged in the metal well pipes. The VOC gas sensors and the ultrasonic water level sensors are arranged at the wellheads of the metal well pipes. The ground controllers, the remote early warning signal transmitters and the power supply modules are arranged above the wellheads of the metal well pipes.

[0007] As described in the pollution leakage monitoring and early warning system for underground facilities of an industrial enterprise in production, the optical fiber water quality sensing module includes a hollow shell, and a light source, a photoelectric signal processing module, an optical fiber bundle, an optical fiber connector, an optical fiber sensing probe and a flushing device are arranged in the hollow shell. The light source, the optical fiber sensing probe and the photoelectric signal processing module are connected in sequence through the optical fiber bundle and the optical fiber connector. A water inlet with an electromagnetic valve is provided at the bottom of the hollow shell, and the water inlet is filled with organic adsorption material. A water outlet with an electromagnetic valve is provided at the upper part of the hollow shell, and the flushing device is used to flush the optical fiber sensing probe.

[0008] As described in the pollution leakage monitoring and early warning system for underground facilities of an industrial enterprise in operation, the light source is an infrared light source, and the photoelectric signal processing module includes an optical power detector and a photoelectric converter that are interconnected.

[0009] As described in the pollution leakage monitoring and early warning system for underground facilities of an industrial enterprise in operation, a sealing pedestal is provided at the wellhead of the metal well pipe, the ground controller, the remote early warning signal transmitter and the power supply module are arranged on the top surface of the sealing pedestal, and protective piles are provided around the sealing pedestal.

[0010] As described in the pollution leakage monitoring and early warning system for underground facilities of an industrial enterprise in operation, the power supply module includes a battery and a solar power supply that are interconnected.

[0011] As described in the pollution leakage monitoring and early warning system for underground facilities of an industrial enterprise in operation, the VOC gas sensor jacket is provided with a breathable, water-removing, and dust-proof fiber filler protective layer, and the VOC gas sensor is an electrolytic sensor or a photoionization sensor.

[0012] As described in the pollution leakage monitoring and early warning system for underground facilities in an industrial enterprise, the metal well pipe is a double-layer structure filled with filter material, the metal well pipe is provided with sieve slots within the depth range of the aquifer, and the bottom of the metal well pipe is a conical soil-extruding drill bit.

[0013] The beneficial effects of the technical solution of this utility model are:

[0014] 1. This utility model uses low-disturbance static well pressure to install optical fibers, which can reduce construction disturbances. There is no need to excavate large spans to underground facilities. Only point-by-point earthwork construction is required around the target leakage monitoring underground facilities. It has a compact structure, simple construction, and low construction disturbance.

[0015] 2. The utility model uses solar panels to generate electricity and batteries to store energy, so daily maintenance is minimal. Long-term operation can be achieved by simply replacing or cleaning the optical fiber sensor in the warning device after a leakage pollution warning is detected.

[0016] 3. It can monitor both organic pollutants and volatile gases in groundwater, with a comprehensive monitoring range and high leakage warning accuracy. The sensor warning results can be integrated into the remote monitoring system, allowing operators to monitor environmental conditions at a safe distance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] To further illustrate the above-mentioned purpose, structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the structure of the early warning well in a preferred embodiment of the utility model;

[0019] Figure 2 This is a schematic diagram of the plan layout of a preferred embodiment of the utility model;

[0020] Figure 3 This is a schematic diagram of the longitudinal layout of a preferred embodiment of the utility model;

[0021] In the figure: 1. Metal well pipe; 2. VOC gas sensor; 3. Ultrasonic water level sensor; 4. Ground controller; 5. Remote warning signal transmitter; 6. Hollow shell; 7. Light source; 8. Photoelectric signal processing module; 9. Optical fiber bundle; 10. Optical fiber sensor probe; 11. Water inlet; 12. Organic adsorption material; 13. Water outlet; 14. Sealing base; 15. Protective pile; 16. Flushing head; 17. Low-flow water pump; 18. Battery; 19. Solar power supply; 20. Screen slot; 21. Underground facilities. DETAILED DESCRIPTION

[0022] The terms "utility model" and "the present invention" as used in this specification are intended to refer broadly to all subject matter of this specification and any patent claims below. Statements containing these terms should not be understood to limit the subject matter described herein or to limit the meaning or scope of any patent claim below. In addition, this specification does not attempt to describe or limit the subject matter covered by any claim of any specific component, paragraph, statement or figure of this application. The subject matter should be understood with reference to the entire specification, all drawings and any claims below. The present invention may have other embodiments and be practiced or implemented in other ways. Moreover, it should be understood that the wording and terminology used herein are for illustrative purposes and should not be considered as limiting.

[0023] The details of the present invention will now be discussed with reference to the accompanying drawings which illustrate the present invention by way of example only. In the accompanying drawings, similar features or components may be marked with the same reference numerals.

[0024] The use of "including," "having," and "comprising" and variations thereof herein is intended to encompass the items listed thereafter and equivalents thereof, as well as additional items. Although reference may be made to directions such as above, below, upward, downward, rearward, bottom, top, front, and rear in describing the drawings, for convenience, reference is made relative to the drawings. These directions are not intended to literally define or limit the present invention in any manner. Furthermore, terms such as "first," "second," and "third" are used herein for descriptive purposes and are not intended to indicate or imply importance or significance.

[0025] In a preferred embodiment, the utility model comprises a plurality of early warning wells for monitoring and warning of underground facility pollution leakage in an industrial enterprise. Preferably, three early warning wells are arranged downstream and within 1m on both sides of the underground oily wastewater storage tank. Figure 1 As shown, the early warning well includes a prefabricated metal well pipe 1, a fiber optic water quality sensing module, a VOC gas sensor 2, an ultrasonic water level sensor 3, a ground controller 4, a remote early warning signal transmitter 5, and a power supply module. The ground controller 4 is connected to the fiber optic water quality sensing module, VOC gas sensor 2, ultrasonic water level sensor 3, and remote early warning signal transmitter 5, respectively, and the power supply module is responsible for power supply. The metal well pipe 1 is vertically buried underground, with the fiber optic water quality sensing module installed inside the metal well pipe 1, the VOC gas sensor 2 and ultrasonic water level sensor 3 installed at the wellhead of the metal well pipe 1, and the ground controller 4, remote early warning signal transmitter 5, and power supply module installed above the wellhead of the metal well pipe 1.

[0026] Continuing to refer to the figure, the fiber optic water quality sensing module includes a hollow shell 6, in which a light source 7, a photoelectric signal processing module 8, a fiber optic bundle 9, a fiber optic connector, a fiber optic sensing probe 10 and a flushing device are arranged. The light source 7, the fiber optic sensing probe 10 and the photoelectric signal processing module 8 are connected in sequence through the fiber optic bundle 9 and the fiber optic connector. The bottom of the hollow shell 6 is provided with a water inlet 11 with a solenoid valve, and the water inlet 11 is filled with an organic adsorption material 12. The upper part of the hollow shell 6 is provided with a water outlet 13 with a solenoid valve, and the flushing device is used to flush the fiber optic sensing probe 10. The fiber optic bundle 9 is a Z-type optical fiber with a reference light path, specifically a 7-core fiber optic bundle (1 incident light fiber and 6 exiting fibers) composed of an incident fiber and an exiting fiber, and the fiber optic connector is of the SMA905 model.

[0027] Organic adsorption material 12 is a polystyrene-based oil-absorbing material or nanocellulose aerogel oil-absorbing material to absorb pollutants in groundwater. Light source 7 is an infrared light source with a wavelength range of 2.0-6.0 μm. Photoelectric signal processing module 8 includes an interconnected optical power detector and a photoelectric converter. Fiber optic sensor probe 10 is a reflective immersion probe.

[0028] Further, see Figure 1 As shown, a sealing pedestal 14 is provided at the wellhead of the metal well pipe 1. A surface controller 4, a remote warning signal transmitter 5, and a power supply module are located on the top surface of the sealing pedestal 14. Protective piles 15 are provided around the sealing pedestal 14. The sealing pedestal 13 is sealed and waterproofed with a water stop ring. The bottom surface of the pedestal has mounting openings for securing the VOC gas sensor 2, the ultrasonic water level sensor 3, and the light source 7 and photoelectric signal processing module 8 of the fiber optic water quality sensing module.

[0029] The flushing device includes a flushing head 16 and a low-flow water pump 17. The optical fiber sensor probe 10 is cleaned regularly by the flushing head 16. The flushing head 16 extracts uncontaminated groundwater in the prefabricated metal well pipe through the low-flow water pump 17 as a flushing water source. The control cables of the solenoid valves at the inlet and outlet and the low-flow water pump 17 are gathered along the side wall to the sealing base 14 at the top. The water inlet of the low-flow water pump 17 is provided with an adsorption filter layer.

[0030] The power supply module includes a battery 18 and a solar power supply 19 (solar panel) connected to each other.

[0031] The VOC gas sensor 2 is an electrolytic sensor or a photoionization sensor, and is provided with an air-permeable, water-removing, and dust-proof fiber filler protective layer on the outside, which can detect benzene series and chlorinated hydrocarbon volatile organic pollutants in soil gas.

[0032] The metal well pipe 1 is a double-layer structure filled with filter material. A screen slot 20 is provided within the depth range of the aquifer. The bottom is a conical soil-squeezing drill bit. The inner pipe diameter is greater than 15 cm, the outer pipe diameter is greater than 23 cm, preferably 25 cm. The width of the screened portion of the inner pipe is 0.2 mm, and the width of the screened portion of the outer pipe is 0.7 mm.

[0033] When the utility model is used in construction:

[0034] S1. Collect data on the depth of underground facilities, geology, and hydrogeology to determine the possible depth of leakage pollution, the direction of groundwater flow and the scope of pollution spread under the presence of underground facilities, and determine the path of groundwater pollution spread. Figure 2 and Figure 3 The underground facility 21 is an underground oily wastewater storage tank, and the pollutants that may leak are benzene series and petroleum hydrocarbons.

[0035] S2. Monitoring holes are arranged downstream and on both sides of the groundwater pollution diffusion path of the underground facility within a certain distance (preferably 1m). The hardened layer of the ground is broken and pre-drilled. The diameter of the pre-drilled hole is smaller than the outer diameter of the prefabricated metal well pipe. The diameter of the pre-drilled hole is 23cm. After the hole is formed, a prefabricated metal well pipe with an outer diameter of 25cm is statically pressed in. The depth of the well pipe is greater than the predicted depth of the pollution leakage of the underground facility 21 by 0.5m. For example, the predicted depth of the pollution leakage of the underground facility 21 is 3.0m, and the depth of the well pipe is 3.5m. The seam ring on the top of the well pipe wall is sealed with cement mortar.

[0036] S3. After the well is completed, clean it until the water quality is clear and the water level is stable, meeting the groundwater sampling requirements. Fix the optical fiber water quality sensing module, VOC gas sensor 2, and ultrasonic water level sensor 3 to the mounting bayonet on the bottom surface of the sealing base 14 at the wellhead, and then install the sealing base 14.

[0037] S4. Install the ground controller 4 and the power supply module on the top surface of the sealing pedestal 14, test the power supply module, each sensor and the remote warning signal transmitter 5, and set the alarm threshold of each sensor, including the water level fluctuation range, the benzene gas concentration, the change in the optical power received by the optical fiber sensor probe (with uncontaminated groundwater as a reference), etc.

[0038] S5. After the test is correct, set the monitoring frequency and cleaning frequency on the ground controller 4, preferably 4 times / day. Start the leakage monitoring and warning system regularly according to the set monitoring and warning frequency, open the water inlet 11, and after the groundwater enters the hollow shell 6 of the optical fiber water quality sensing module, the pollutants are enriched by the polystyrene-based oil-absorbing material or the nanocellulose aerogel oil-absorbing material. The optical fiber water quality sensing module monitors the optical power changes caused by the changes in the concentration of organic pollution in the groundwater. The VOC gas sensor 2 monitors the changes in the concentration of volatile organic pollutants in the soil gas in the well. When the change exceeds the set threshold, the warning signal is transmitted through the remote warning signal transmitter 5. After the monitoring is completed, the groundwater in the optical fiber water quality sensing module is discharged from the water outlet 13 through the low-flow rate water pump 17, and the flushing head 16 sprays groundwater to clean the optical fiber sensing probe 10.

[0039] S6. When the optical fiber water quality sensor module is not monitoring, its water inlet solenoid valve and water outlet solenoid valve are closed. During daily operation, the early warning system monitors the water level fluctuation range in the well through the ultrasonic water level sensor 3, and judges the status of the prefabricated metal well pipe by setting the upper and lower limits to avoid well pipe blockage.

[0040] S7. After pollution spreads in underground facilities and triggers an early warning, the underground facilities are repaired, the contaminated soil and groundwater around the underground facilities are cleaned, the wells are washed, the fiber optic water quality sensor modules in the wells are cleaned, and the next spread early warning is issued.

[0041] The above are only preferred embodiments of the present invention and do not limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A pollution leakage monitoring and early warning system for underground facilities in industrial enterprises, characterized by: It includes several early warning wells, which include metal well pipes, optical fiber water quality sensing modules, VOC gas sensors, ultrasonic water level sensors, ground controllers, remote early warning signal transmitters and power supply modules. The ground controllers are respectively connected to the optical fiber water quality sensing modules, the VOC gas sensors, the ultrasonic water level sensors and the remote early warning signal transmitters. The power supply module is responsible for power supply. The metal well pipes are vertically buried underground. The optical fiber water quality sensing modules are arranged in the metal well pipes. The VOC gas sensors and the ultrasonic water level sensors are arranged at the wellhead of the metal well pipes. The ground controllers, the remote early warning signal transmitters and the power supply module are arranged above the wellhead of the metal well pipes.

2. The pollution leakage monitoring and early warning system for underground facilities in industrial enterprises as claimed in claim 1 is characterized in that: The optical fiber water quality sensing module includes a hollow shell, in which a light source, a photoelectric signal processing module, an optical fiber bundle, an optical fiber connector, an optical fiber sensing probe and a flushing device are arranged. The light source, the optical fiber sensing probe and the photoelectric signal processing module are connected in sequence through the optical fiber bundle and the optical fiber connector. A water inlet with an electromagnetic valve is provided at the bottom of the hollow shell, and the water inlet is filled with organic adsorption material. A water outlet with an electromagnetic valve is provided at the upper part of the hollow shell, and the flushing device is used to flush the optical fiber sensing probe.

3. The pollution leakage monitoring and early warning system for underground facilities in industrial enterprises as claimed in claim 2 is characterized in that: The light source is an infrared light source, and the photoelectric signal processing module includes an optical power detector and a photoelectric converter that are connected to each other.

4. The pollution leakage monitoring and early warning system for underground facilities in industrial enterprises as claimed in claim 1 is characterized in that: A sealing pedestal is provided at the wellhead of the metal well pipe, the ground controller, the remote warning signal transmitter and the power supply module are arranged on the top surface of the sealing pedestal, and protective piles are provided around the sealing pedestal.

5. The pollution leakage monitoring and early warning system for underground facilities in industrial enterprises as claimed in claim 1 or 4, characterized in that: The power supply module includes a battery and a solar power supply that are connected to each other.

6. The pollution leakage monitoring and early warning system for underground facilities in industrial enterprises as claimed in claim 1, characterized in that: The VOC gas sensor outer shell is provided with an air-permeable, water-removing and dust-proof fiber filler protective layer, and the VOC gas sensor is an electrolytic sensor or a photoionization sensor.

7. The pollution leakage monitoring and early warning system for underground facilities in industrial enterprises as claimed in claim 1 is characterized in that: The metal well pipe is a double-layer structure filled with filter material. The metal well pipe is provided with sieve slots within the depth range of the aquifer. The bottom of the metal well pipe is a conical soil-squeezing drill bit.

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