Gas Leak Detection Methods for Underground Wastewater Treatment Plants

Abstract

This invention discloses a gas leak detection method for underground wastewater treatment plants. It includes using detectors in a detector module to detect the concentration of different types of toxic and harmful gases leaking from various areas of the underground wastewater treatment plant in real time; comparing and analyzing the detection results, setting corresponding thresholds for each type of gas, establishing a relationship model between lamp color temperature and the concentration of each type of gas, and calculating and outputting the lamp color temperature values ​​for each area; adjusting the lamp color temperature for each area according to the value of the lamp color temperature; and deploying dimmable lamps in each area of ​​the underground wastewater treatment plant. Each dimmable lamp receives the lamp color temperature value sent by the lighting control module and displays the dimmable color temperature intensity of its respective area. This invention not only solves the problem of alarm area being limited by the installation location of gas detectors, achieving full-area alarm coverage for the wastewater treatment plant, but also calculates the lamp color temperature values ​​for each area, enabling automated monitoring of the wastewater treatment plant.

Description

Technical Field

[0001] This invention relates to the field of urban wastewater treatment technology, specifically to a gas leak detection method for underground wastewater treatment plants. Background Technology

[0002] With the continuous development of my country's economy and the increasing stringency of environmental protection standards, more and more sewage treatment plants are beginning to make rational use of underground space and construct underground structures to address the drawbacks of traditional layouts. In underground sewage treatment plants, the sewage treatment process may generate large amounts of toxic and harmful gases. Due to the enclosed environment of the underground space, these gases may accumulate, and when the concentration exceeds a certain limit, it will endanger the health and safety of personnel.

[0003] Currently, underground wastewater treatment plants primarily rely on the combined use of gas detectors and audible / visual alarms to detect leaks of toxic and harmful gases. However, this method has several drawbacks: the alarms are fixedly installed alongside the gas detectors, meaning they can only be installed where gas detectors are located. Therefore, the alarm area is limited by the gas detector's installation location. If a gas detector cannot be installed at a certain location within an area, the alarm will not sound at that location, preventing staff from promptly detecting potential hazards. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention proposes a gas leak detection method for underground wastewater treatment plants. The method involves setting up audible and visual alarms as dimmable lamps in various areas of the underground wastewater treatment plant, establishing a model relating the lamp color temperature to the concentration of various types of leaked gases, calculating the color temperature values ​​for each area, and adjusting the color temperature of the lamps in each area according to the value. Workers can visually observe the color temperature of the dimmable lamps in each area from any location within the wastewater treatment plant, enabling timely and effective monitoring of gas leaks in each area.

[0005] To achieve the above objectives, the present invention provides a gas leak detection method for underground sewage treatment plants, characterized by the following steps:

[0006] S1) The detectors in the detector module are used to detect the content of different types of toxic and harmful gases leaking in each area of ​​the underground sewage treatment plant in real time. The detectors are arranged at different heights in each area. The detectors include hydrogen sulfide detectors, ammonia detectors and methane detectors, which are used to detect the hydrogen sulfide content, ammonia content and methane content in each area, respectively.

[0007] S2) The detection results of the detector module are sent to the central control module. The central control module compares and analyzes the detection results, sets corresponding thresholds for each type of gas, establishes a relationship model between the color temperature of the lamp and the concentration of each type of gas, and calculates and outputs the color temperature value of the lamp in each area. If the output color temperature value of the lamp in a certain area is less than the base color temperature under normal lighting power supply conditions, then proceed to step S3); otherwise, proceed to step S1.

[0008] After receiving the detection results from the detector module, the central control module performs filtering preprocessing on the detection results to obtain the toxic and harmful gas concentration filter value. The filtering preprocessing includes continuously sampling N gas concentration values, removing one maximum concentration value and one minimum concentration value, and calculating the arithmetic mean of N-2 concentration data as the toxic and harmful gas concentration filter value.

[0009] The relationship between the color temperature of the lamp and the concentration of various types of gases is expressed by the model Y = max[min[k1(x1-5),0] + min[k2(x2-25),0] + min[k3(x3-1),0] + 3000,900]

[0010] In the formula,

[0011] Y represents the color temperature of the lamps in each output area.

[0012] Max means taking the maximum value.

[0013] min means taking the minimum value.

[0014] k1 is the hydrogen sulfide concentration adjustment coefficient, with units of K / ppm.

[0015] x1-5 represents the difference between the hydrogen sulfide concentration filtration value and the hydrogen sulfide gas threshold value. The unit for the hydrogen sulfide concentration filtration value is ppm.

[0016] k2 is the ammonia concentration adjustment coefficient, with units of K / ppm.

[0017] x2-25 represents the difference between the ammonia concentration filtration value and the ammonia gas threshold value. The unit for the ammonia concentration filtration value is ppm.

[0018] k3 is the methane concentration adjustment coefficient, with units of K / %VOL.

[0019] x3-1 represents the difference between the methane concentration filtration value and the methane gas threshold value. The unit of the methane concentration filtration value is %VOL.

[0020] 3000 is the base color temperature of the luminaire under normal lighting power supply conditions, in Kelvin (K).

[0021] 900 is the lower limit of the color temperature that the lamp can display, in Kelvin (K).

[0022] S3) The central control module outputs the color temperature values ​​of the lamps in each area and sends them to the lighting control module. The lighting control module adjusts the color temperature of the lamps in each area according to the value of the color temperature values.

[0023] S4) Dimmable lighting fixtures are installed in each area of ​​the underground wastewater treatment plant. The dimmable lighting fixtures in all areas constitute a dimmable lighting fixture module. The dimmable lighting fixtures in each area receive the color temperature value of the lighting fixture sent by the lighting control module, and display the dimmable color temperature intensity of their respective areas. By visually observing the color temperature of the dimmable lighting fixtures in each area, the degree of leakage of toxic and harmful gases in each area can be determined. If the color temperature of the dimmable lighting fixtures is lower and the color tone is warmer, then there is more leakage of toxic and harmful gases in that area; if the color temperature of the dimmable lighting fixtures is higher and the color tone is cooler, then there is less leakage of toxic and harmful gases in that area.

[0024] Further, in S1), the underground wastewater treatment plant includes a pretreatment area, a biological treatment area, a sludge treatment area, an area where odors tend to accumulate, a low-lying area within the plant, an area with high personnel activity, a deodorization area, an underground pipe gallery area, an auxiliary workshop area, and a sump area; the pretreatment area, biological treatment area, sludge treatment area, underground pipe gallery area, auxiliary workshop area, and sump area are respectively equipped with hydrogen sulfide detectors, ammonia detectors, and methane detectors; the deodorization area is equipped with hydrogen sulfide detectors and ammonia detectors; the area where odors tend to accumulate, the low-lying area within the plant, and the area with high personnel activity are each equipped with hydrogen sulfide detectors.

[0025] Furthermore, in S1), the hydrogen sulfide detector is installed at a height of 0.4 to 0.6 meters from the walking surface of each area, the ammonia detector is installed close to the bottom of the ceiling of each area, and the methane detector is installed close to the bottom of the ceiling of each area.

[0026] Furthermore, in S4), the dimmable lamps are evenly distributed under the ceiling in each area of ​​the underground sewage treatment plant.

[0027] Furthermore, in S4), without adjusting the color temperature, the dimmable luminaire provides daily lighting for all areas of the underground sewage treatment plant, and its brightness and color temperature meet the basic conditions for underground lighting.

[0028] Furthermore, in S4), the number and arrangement of dimmable lamps in each area of ​​the underground sewage treatment plant meet the requirement of the 100lx illuminance standard value.

[0029] The advantages of this invention are:

[0030] 1. This invention replaces the existing sound and light alarm with dimmable lamps in various areas of an underground sewage treatment plant, establishes a model relating lamp color temperature to the concentration of various types of leaked gases, calculates the lamp color temperature values ​​for each area, and adjusts the lamp color temperature for each area according to the value of the lamp color temperature. Staff can visually observe the color temperature of the dimmable lamps in each area from any location in the sewage treatment plant, and promptly and effectively observe the gas leakage situation in each area.

[0031] 2. Compared with existing alarm devices (where audible and visual alarms can only be installed where gas detectors are located), this invention sets the audible and visual alarms as dimmable lamps in various areas of underground wastewater treatment plants, and separates the gas detectors from the dimmable lamps. On the one hand, this solves the problem that the alarm area is limited by the installation location of the gas detectors, realizing alarm coverage throughout the entire wastewater treatment plant; on the other hand, through the relationship model between the color temperature of the lamps and the concentration of various types of leaked gases, it realizes automated monitoring of the wastewater treatment plant and improves the emergency response level.

[0032] 3. This invention performs filtering preprocessing on the detector's detection results to obtain toxic and harmful gas concentration filter values, thereby improving the accuracy of the detection results and avoiding false alarm triggering;

[0033] This invention provides a gas leak detection method for underground wastewater treatment plants. It not only separates the gas detector from the dimmable lighting fixture, solving the problem of alarm zones being limited by the gas detector's installation location and enabling comprehensive alarm coverage across the entire wastewater treatment plant, but also establishes a model relating the lighting fixture's color temperature to the concentration of various leaked gases. This model calculates the color temperature values ​​for each area and adjusts the color temperature of the lighting fixtures in different areas based on these values, achieving automated monitoring of the wastewater treatment plant and improving emergency response capabilities. Attached Figure Description

[0034] Figure 1 This is a flowchart of the present invention;

[0035] Figure 2 This is a structural block diagram of the gas leak detection system for underground sewage treatment plants in this invention;

[0036] Figure 3 This is a diagram showing the detector arrangement structure in this invention;

[0037] In the diagram: Detector module 1, Central control module 2, Lighting control module 3, Dimmable lighting module 4;

[0038] Detector module 1 includes: detector 1-1;

[0039] The dimmable lighting module 4 includes: dimmable lighting 4-1. Detailed Implementation

[0040] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0042] This invention relates to a gas leak detection method for underground wastewater treatment plants, implemented through a gas leak detection system for underground wastewater treatment plants. The gas leak detection system for underground wastewater treatment plants includes a detector module 1, a central control module 2, a lighting control module 3, and a dimmable lighting module 4, as shown below. Figure 2 As shown.

[0043] The detector module 1 is used to detect the content of different types of toxic and harmful gases leaked in various areas of the underground sewage treatment plant, including detectors 1-1 arranged at different heights in each area.

[0044] The central control module 2 is used to receive the detection results from the detector module 1, compare and analyze the detection results, set corresponding thresholds for each type of gas, establish a relationship model between the color temperature of the lamps and the concentration of each type of gas, and calculate and output the color temperature values ​​of the lamps in each area.

[0045] The lighting control module 3 is used to receive the lamp color temperature result sent by the central control module 2, and adjust the lamp color temperature of each area according to the value of the lamp color temperature.

[0046] The dimmable lighting module 4 includes dimmable lighting fixtures 4-1 installed in each area, which are used to display the dimmable color temperature intensity of the area according to the color temperature value of the lighting fixture sent by the lighting control module 3.

[0047] like Figure 1 As shown, the gas leak detection method of the present invention for underground sewage treatment plants includes the following steps:

[0048] S1) The detector 1-1 in the detector module 1 is used to detect the content of different types of toxic and harmful gases leaked in each area of ​​the underground sewage treatment plant in real time. The detector 1-1 is arranged at different heights in each area. The detector 1-1 includes a hydrogen sulfide detector, an ammonia detector and a methane detector, which are used to detect the hydrogen sulfide content, ammonia content and methane content in each area, respectively.

[0049] Specifically, the underground wastewater treatment plant includes a pretreatment area, a biological treatment area, a sludge treatment area, an area where odors tend to accumulate, a low-lying area within the plant, an area with high personnel activity, a deodorization area, an underground pipe gallery area, an auxiliary workshop area, and a sump area.

[0050] The pretreatment area, biological treatment area, sludge treatment area, underground pipe gallery area, auxiliary workshop area, and sump area are respectively equipped with hydrogen sulfide detectors, ammonia detectors, and methane detectors; the deodorization area is equipped with hydrogen sulfide detectors and ammonia detectors; and the areas where odors tend to accumulate, low-lying areas within the plant, and areas with high personnel activity are respectively equipped with hydrogen sulfide detectors.

[0051] The hydrogen sulfide detector is installed at a height of 0.4–0.6 m above the walking surface in each area. The ammonia detector is installed directly below the ceiling in each area. The methane detector is also installed directly below the ceiling in each area. A detailed layout diagram is shown below. Figure 3 As shown.

[0052] S2) The detection results of detector module 1 are sent to central control module 2. Central control module 2 compares and analyzes the detection results, sets corresponding thresholds for each type of gas, establishes a relationship model between lamp color temperature and the concentration of each type of gas, and calculates and outputs the lamp color temperature value for each area. If the output lamp color temperature value for a certain area is less than the base color temperature under normal lighting power supply conditions, then proceed to step S3); otherwise, proceed to step S1).

[0053] Preferably, after receiving the detection results from the detector module 1, the central control module 2 performs filtering preprocessing on the detection results to obtain the toxic and harmful gas concentration filter value; the filtering preprocessing includes continuously sampling N gas concentration values, removing one maximum concentration value and one minimum concentration value, and calculating the arithmetic mean of N-2 concentration data as the toxic and harmful gas concentration filter value, where N takes the value of 5 to 12.

[0054] This invention performs filtering preprocessing on the detector's detection results to obtain toxic and harmful gas concentration filter values, thereby improving the accuracy of the detection results and avoiding false alarm triggering.

[0055] Specifically, the relationship between the color temperature of the lamp and the concentration of various types of gases is expressed as Y = max[min[k1(x1-5),0] + min[k2(x2-25),0] + min[k3(x3-1),0] + 3000,900]

[0056] In the formula,

[0057] Y represents the color temperature of the lamps in each output area.

[0058] Max means taking the maximum value.

[0059] min means taking the minimum value.

[0060] k1 is the hydrogen sulfide concentration adjustment coefficient, with units of K / ppm.

[0061] x1-5 represents the difference between the hydrogen sulfide concentration filtration value and the hydrogen sulfide gas threshold value. The unit for the hydrogen sulfide concentration filtration value is ppm.

[0062] k2 is the ammonia concentration adjustment coefficient, with units of K / ppm.

[0063] x2-25 represents the difference between the ammonia concentration filtration value and the ammonia gas threshold value. The unit for the ammonia concentration filtration value is ppm.

[0064] k3 is the methane concentration adjustment coefficient, with units of K / %VOL.

[0065] x3-1 represents the difference between the methane concentration filtration value and the methane gas threshold value. The unit of the methane concentration filtration value is %VOL.

[0066] 3000 is the base color temperature of the luminaire under normal lighting power supply conditions, in Kelvin (K).

[0067] 900 is the lower limit of the color temperature that the lamp can display, in K.

[0068] Specifically, the hydrogen sulfide concentration adjustment coefficient k1 is set to -420K / ppm, the ammonia concentration adjustment coefficient k2 is set to -84K / ppm, and the methane concentration adjustment coefficient k3 is set to 2100K / %VOL.

[0069] When the concentration of each toxic and harmful gas does not exceed its set threshold, the output luminaire color temperature is the base color temperature of 3000K under normal lighting conditions; when the concentration of toxic and harmful gases exceeds its set threshold, the output luminaire color temperature decreases, and the minimum lower limit of the output luminaire color temperature is 900K.

[0070] If the hydrogen sulfide concentration filter value x1 is 6 ppm, the ammonia concentration filter value x2 is 0 ppm, and the methane concentration filter value x3 is 0 ppm, then the calculated output color temperature Y of the lamps in each area is 2580 K.

[0071] If the hydrogen sulfide concentration filter value x1 is 6 ppm, the ammonia concentration filter value x2 is 26 ppm, and the methane concentration filter value x3 is 0 ppm, then the calculated output color temperature Y of the lamps in each area is 2496 K.

[0072] S3) The central control module 2 outputs the color temperature values ​​of the lamps in each area and sends them to the lighting control module 3. The lighting control module 3 adjusts the color temperature of the lamps in each area according to the value of the color temperature values.

[0073] S4) Each area of ​​the underground wastewater treatment plant is equipped with its own dimmable lighting fixture 4-1. All the dimmable lighting fixtures 4-1 in all areas constitute a dimmable lighting fixture module 4. Each dimmable lighting fixture 4-1 in each area receives the color temperature value of the lighting fixture sent by the lighting control module 3 and displays the intensity of the dimmable color temperature in its respective area. By visually observing the color temperature of the dimmable lighting fixtures in each area, the degree of leakage of toxic and harmful gases in each area can be determined. If the color temperature of the dimmable lighting fixture is lower and the color tone is warmer, then there is more leakage of toxic and harmful gases in that area; if the color temperature of the dimmable lighting fixture is higher and the color tone is cooler, then there is less leakage of toxic and harmful gases in that area.

[0074] Specifically, the dimmable lighting fixtures are evenly distributed under the ceiling in each area of ​​the underground sewage treatment plant.

[0075] Specifically, without adjusting the color temperature, the dimmable luminaire provides daily lighting for various areas of the underground sewage treatment plant, and its brightness and color temperature meet the basic requirements for underground lighting.

[0076] Preferably, the number and arrangement of dimmable lamps in each area of ​​the underground sewage treatment plant meet the requirement of a 100 lx illuminance standard value.

[0077] Compared with existing alarm devices (where audible and visual alarms can only be installed where gas detectors are located), this invention sets up audible and visual alarms as dimmable lamps in various areas of underground wastewater treatment plants, and separates the gas detectors from the dimmable lamps. On the one hand, this solves the problem that the alarm area is limited by the installation location of the gas detectors, realizing alarm coverage throughout the entire wastewater treatment plant; on the other hand, through the relationship model between the color temperature of the lamps and the concentration of various types of leaked gases, it realizes automated monitoring of the wastewater treatment plant and improves the emergency response level.

[0078] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A method for gas leak detection for an underground sewage plant, characterized by, Comprise the following steps: S1) Real-time detection of different types of toxic and harmful gas content leaked in each area of the underground sewage plant by using the detector (1-1) in the detector module (1), the detector (1-1) is arranged at different heights in each area, the detector (1-1) comprises a hydrogen sulfide detector, an ammonia gas detector and a methane detector, which are used to detect the hydrogen sulfide content, ammonia content and methane content in each area respectively; S2) The detection results of the detector module (1) are sent to the central control module (2), the central control module (2) compares and analyzes the detection results, sets corresponding threshold values for each type of gas, establishes a relationship model of lamp color temperature and each type of gas concentration, and calculates the lamp color temperature value of each area; If the output lamp color temperature value of a certain area is less than the basic color temperature under the normal lighting power supply condition of the lamp, step S3) is entered, otherwise, step S1) is entered; After the central control module (2) receives the detection results of the detector module (1), the detection results are preprocessed by filtering to obtain the toxic and harmful gas concentration filter value; The filtering preprocessing includes continuously sampling N gas concentration values, removing one maximum concentration value and one minimum concentration value, calculating the arithmetic mean of N-2 concentration data as the toxic and harmful gas concentration filter value; The relationship model of lamp color temperature and each type of gas concentration is represented as Y = max[min[k1(x1-5),0] + min[k2(x2-25),0] + min[k3(x3-1),0] + 3000,900] In the formula, Y is the output lamp color temperature of each area, Max represents taking the maximum value, min represents taking the minimum value, k1 is the hydrogen sulfide concentration adjustment coefficient, unit: K / ppm, x1-5 is the difference between the hydrogen sulfide concentration filter value and the hydrogen sulfide gas threshold value, the unit of hydrogen sulfide concentration filter value is ppm, k2 is the ammonia concentration adjustment coefficient, unit: K / ppm, x2-25 is the difference between the ammonia concentration filter value and the ammonia gas threshold value, the unit of ammonia concentration filter value is ppm, k3 is the methane concentration adjustment coefficient, unit: K / %VOL, x3-1 is the difference between the methane concentration filter value and the methane gas threshold value, the unit of methane concentration filter value is %VOL, 3000 is the basic color temperature under the normal lighting power supply condition of the lamp, unit: K, 900 is the lower limit of the color temperature that the lamp can display, unit: K; S3) The lamp color temperature value of each area output by the central control module (2) is sent to the lighting control module (3), and the lighting control module (3) adjusts the lamp color temperature of each area according to the size of the lamp color temperature value. S4) In each area of the underground sewage plant, a respective adjustable light lamp (4-1) is arranged, and all the adjustable light lamps (4-1) in all areas constitute an adjustable light lamp module (4). The adjustable light lamp (4-1) in each area receives the lamp color temperature value sent by the lighting control module (3) to display the adjustable light color temperature of the respective area. By observing the color temperature of the adjustable light lamp in each area with the naked eye, the leakage degree of toxic and harmful gases in each area can be determined. If the adjustable light lamp color temperature is lower and the color tone is warmer, the toxic and harmful gas leakage in the area is more. If the adjustable light lamp color temperature is higher and the color tone is colder, the toxic and harmful gas leakage in the area is less. In the case of no color temperature adjustment, the adjustable light lamp provides daily lighting for each area of the underground sewage plant, and the brightness and color temperature both meet the basic conditions of underground lighting. When the concentration of each toxic and harmful gas does not exceed the set threshold value, the output lamp color temperature is the basic color temperature of 3000K under normal lighting conditions. When the concentration of toxic and harmful gas exceeds the set threshold value, the output lamp color temperature decreases, and the lowest limit value of the output lamp color temperature is 900K. The detector (1-1) and the adjustable light lamp (4-1) are installed separately.

2. The gas leak detection method for a below-ground sewage plant according to claim 1, characterized by: In S1, the underground sewage plant includes a pretreatment area, a biological treatment area, a sludge treatment area, an odor aggregation area, an indoor low-lying area, a personnel activity intensive area, a deodorization area, an underground pipe gallery area, an auxiliary workshop area, and a sump area. The pretreatment area, the biological treatment area, the sludge treatment area, the underground pipe gallery area, the auxiliary workshop area, and the sump area are respectively installed with a hydrogen sulfide detector, an ammonia gas detector, and a methane detector. The deodorization area is installed with a hydrogen sulfide detector and an ammonia gas detector. The odor aggregation area, the indoor low-lying area, and the personnel activity intensive area are respectively installed with a hydrogen sulfide detector.

3. The method for gas leak detection for underground sewage plants as claimed in claim 2, wherein: In S1, the installation height of the hydrogen sulfide detector is 0.4-0.6m from the walking surface of each area, the installation position of the ammonia gas detector is close to the bottom of the suspended ceiling of each area, and the installation position of the methane detector is close to the bottom of the suspended ceiling of each area.

4. The gas leak detection method for a below-ground sewage plant according to claim 1, characterized by: In S4, the adjustable light lamps are uniformly distributed under the suspended ceilings of each area of the underground sewage plant.

5. The method for gas leak detection for underground sewage plants as claimed in claim 4, wherein: In S4, the number and arrangement of the adjustable light lamps in each area of the underground sewage plant meet the requirements of the 100lx standard value of illuminance.

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