Sewage treatment gas component monitoring and trapping device

Abstract

The utility model discloses a gas component monitoring and trapping device for sewage treatment, which belongs to the technical field of sewage treatment and comprises a gas collecting hood and an air pipe, the bottom of the gas collecting hood is provided with a gas inlet used for covering a pool cover of a sewage pool, the top of the gas collecting hood is provided with an exhaust port, and a gas inlet pipe opening of the air pipe is communicated with the exhaust port. A check valve is arranged at an air outlet pipe opening of the air pipe, and a gas sensor set communicated with the inside of the air pipe is arranged on the outer wall of the air pipe. Inlet gas enters the gas collecting hood from the sewage pool and then is discharged through the air pipe, and the gas sensor group on the air pipe can monitor the concentration of each gas in the air pipe, so that the reaction condition in the sewage pool can be visually reflected, and intelligent management of the sewage treatment unit is facilitated; the arrangement of the check valve enables the sewage pool, the gas collecting hood and the air pipe to form a closed space in which gas only flows out and does not flow in, no external gas enters, the gas trapping efficiency of the sewage pool can be improved, the influence of external air and weather conditions on the gas trapping effect and the monitoring result is reduced, and the real reliability of monitoring is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a sewage treatment gas component monitoring and capturing device. Background Art

[0002] With the continuous development of urbanization, the construction and renovation of sewage treatment plants has become increasingly important. Gases generated during sewage treatment, such as carbon monoxide, hydrogen sulfide, and ammonia, not only pollute the environment but also pose a health threat to workers and surrounding residents. To effectively control and treat these harmful gases, gas capture devices have become an essential component of sewage treatment plants. Sewage tank gas collection hoods are commonly used to seal the gases generated during sewage plant operation in a specific area, preventing the continued spread of waste gases while also protecting the surrounding environment.

[0003] Common types of hoods include: Closed hoods, which partially or completely seal the pollution source to limit the spread of pollutants. This requires a necessary work area or material access point, as well as an observation window and inspection door, at the hood opening, which may affect the sealing effect; External hoods, which, when the pollution source cannot be sealed, are placed near the pollution source and rely on airflow at the hood opening to draw in polluted gases. However, since the hood opening is a certain distance from the pollution source and is susceptible to interference from airflow in other directions, a large air volume is required to control the spread of polluted airflow, resulting in low collection efficiency; and Blow-and-Suction hoods, which have an air intake opposite the external suction hood to form an air curtain to prevent the escape of pollutants. While this has advantages such as low air volume and strong anti-interference capabilities, additional equipment or design may be required in some cases to achieve the air curtain effect. Although existing technologies offer a variety of options, they are generally limited to collecting gases, and few devices can simultaneously monitor gas concentrations. Summary of the Invention

[0004] The purpose of this utility model is to solve the above technical problems and provide a sewage treatment gas component monitoring and capture device, which can capture the gas generated in the sewage pool and monitor the concentration of each component of the captured gas. The check valve setting can effectively reduce the influence of external air and weather conditions on the gas capture effect and monitoring results.

[0005] To achieve the above-mentioned purpose, the present invention provides the following solution: The present invention discloses a sewage treatment gas component monitoring and capturing device, comprising an air collecting hood and an air duct, wherein the bottom of the air collecting hood is provided with an air inlet for setting the pool cover of the sewage pool inside, the top of the air collecting hood is provided with an exhaust port, the air inlet port of the air duct is connected to the exhaust port, the air outlet port of the air duct is provided with a check valve, and the outer wall of the air duct is provided with a gas sensor group connected to the pipe.

[0006] Preferably, a pressure sensor connected to the inside of the air duct is provided on the outer wall of the air duct.

[0007] Preferably, the gas sensor group, the pressure sensor and the air duct are detachably connected.

[0008] Preferably, the cross-section of the air duct is circular.

[0009] Preferably, the air collecting hood includes a cone section and a skirt section sequentially arranged from top to bottom, the exhaust port is located at the top of the cone section, and the air inlet is located at the bottom of the skirt section.

[0010] Preferably, the skirt section is sealed and inserted into the pool opening of the sewage pool, and the skirt section is immersed in the sewage.

[0011] Preferably, the air duct includes a vertical pipe section, a curved pipe section and a horizontal pipe section, the bottom of the vertical pipe section is connected to the air inlet, the top of the vertical pipe section is connected to one end of the curved pipe section, and the other end of the curved pipe section is connected to the horizontal pipe section.

[0012] Preferably, a rain shield is provided at the top of the pipe opening of the transverse pipe section away from the curved pipe section.

[0013] Compared with the prior art, the utility model has achieved the following technical effects:

[0014] In the sewage treatment gas composition monitoring and capturing device of the present invention, after the intake air enters the gas collecting hood from the sewage pool, it will be discharged through the air duct. Through the gas sensor group on the air duct, the concentration of each gas in the air duct can be monitored, and the reaction situation in the sewage pool can be intuitively reflected, which is beneficial to the intelligent management of the sewage treatment unit; the setting of the check valve makes the sewage pool, the gas collecting hood and the air duct form a closed space where gas can only exit but not enter, and no external gas enters the device, which can improve the capture efficiency of the gas generated in the sewage pool, effectively reduce the influence of external air and weather conditions on the gas capture effect and monitoring results, and ensure the authenticity and reliability of the monitoring; the device is simple and the equipment cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 This is a schematic diagram of the three-dimensional structure of the sewage treatment gas composition monitoring and capture device;

[0017] Figure 2This is a schematic cross-sectional view of a wastewater treatment gas composition monitoring and capture device;

[0018] Figure 3 This is a schematic diagram of a check valve;

[0019] Figure 4 The airflow situation of the exhaust port of the non-skirted air hood is collected;

[0020] Figure 5 The air flow conditions at the exhaust port of the skirted air collection hood are collected.

[0021] Explanation of the accompanying symbols: 1. Gas collecting hood; 2. Air duct; 3. Check valve; 4. Gas sensor group; 5. Pressure sensor; 6. Rain shield; 7. Sewage tank; 8. Skirt section; 9. Cone section; 10. Vertical pipe section; 11. Bend section; 12. Horizontal pipe section; 14. Valve body; 15. Valve disc; 16. Bushing; 17. Valve cover. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] This embodiment provides a sewage treatment gas component monitoring and capture device, such as Figures 1 to 5 As shown, the apparatus comprises an air hood 1 and an air duct 2. An air inlet is provided at the bottom of the air hood 1, through which the sump housing 7 of the sewage tank is enclosed. An exhaust port is provided at the top of the air hood 1, and the air inlet of the air duct 2 is connected to the exhaust port. A check valve 3 is provided at the air outlet of the air duct 2. A gas sensor group 4 is provided on the outer wall of the air duct 2, which is connected to the interior of the air duct 2.

[0024] Working principle:

[0025] When the sewage treatment unit is running, gas will be generated in the sewage pool 7. The gas will enter the gas collecting hood 1 through the air inlet of the gas collecting hood 1. Since the gas collecting hood 1 is a closed container, the gas will stay inside after entering. The heavier gas components will gradually settle to the bottom of the gas collecting hood 1, while the lighter gas may remain at the top. When the gas fills the gas collecting hood 1, it will flow into the air duct 2 from the exhaust port of the gas collecting hood 1 and flow to the air outlet of the air duct 2. The gas sensor group 4 monitors and analyzes the gas passing through the air duct 2 to obtain the concentration of each component gas in the gas, thereby reflecting the reaction situation in the sewage pool 7 to a certain extent. When the gas passes through the check valve 3, it escapes outward in one direction under the action of the check valve 3.

[0026] The gas sensor group 4 is composed of various gas sensors, including but not limited to oxygen sensors, carbon dioxide sensors, nitrogen sensors and other gas sensors, which are used to monitor gas concentrations such as oxygen concentration, carbon dioxide concentration and nitrogen concentration.

[0027] The check valve 3 can be an existing check valve. Here, the internal structure and working principle of the check valve 3 are provided. The check valve 3 is mainly composed of a valve body 14, a valve disc 15, a bushing 16 and a valve cover 17. The valve body 14 is provided with a valve cavity, an air inlet and an air outlet. The valve cover 17 is installed on the top of the valve cavity. The air inlet is connected to the bottom of the valve cavity, and the air outlet is connected to the side wall of the valve cavity. The bushing 16 is fixedly connected to the valve cover 17 and is located in the valve cavity. The valve disc 15 is slidably sleeved in the bushing 16 and is pressed on the air outlet of the air inlet connected to the bottom of the valve cavity by gravity to close the air outlet of the air inlet. When the gas enters the air inlet of the air inlet, the valve disc 15 is pressed on the air outlet of the air inlet. After entering the air duct, it will push the valve disc 15 upwards and push it away from the air outlet of the air inlet, so that the air inlet is connected to the valve cavity. The gas enters the valve cavity and enters from the air inlet of the air outlet and is discharged from the air outlet of the air outlet. If the gas flows in the opposite direction, the air outlet of the air inlet will be closed under the action of the fluid pressure and the weight of the valve disc 15, thereby cutting off the flow and preventing the gas from flowing back. It can effectively prevent the air outside the air duct 2 and rain and snow from entering the air duct 2 and causing an impact.

[0028] In this embodiment, Figures 1 to 5 As shown, a pressure sensor 5 connected to the inside of the duct is provided on the outer wall of the duct 2, and the pressure sensor 5 is used to monitor the pressure in the duct 2. Preferably, the pressure sensor 5 is installed at the top of the duct 2 to reflect the pressure condition at the top of the duct 2.

[0029] Furthermore, in this embodiment, if Figures 1 to 5 As shown, the pressure sensor 5 and the gas sensor group 4 can be connected to an intelligent management system, so that the concentrations of gases such as oxygen, carbon dioxide and nitrogen inside the gas collection hood 1 can be monitored in real time.

[0030] Furthermore, in this embodiment, if Figures 1 to 5 As shown, the gas sensor group 4, the pressure sensor 5 and the air duct 2 can be connected in a detachable manner to facilitate disassembly and maintenance.

[0031] In this embodiment, Figures 1 to 5 As shown, the cross section of the air duct 2 is circular, and the exhaust port of the corresponding air collecting hood 1 is also circular.

[0032] In this embodiment, Figures 1 to 5As shown, the gas collecting hood 1 includes a skirt section 8 and a cone section 9. The cone section 9 and the skirt section 8 are arranged in sequence from top to bottom, with the exhaust port located at the top (tip) of the cone section 9 and the air inlet located at the bottom (thick end) of the skirt section 8. Of course, in order to ensure that the shape of the skirt section 8 is the same as the shape of the pool opening of the sewage pool 7, that is, if the pool opening of the sewage pool 7 is rectangular, then the skirt section 8 is rectangular, and the corresponding cone section 9 is in the shape of a quadrangular pyramid. If the pool opening of the sewage pool 7 is circular, then the skirt section 8 is circular, and the corresponding cone section 9 is in the shape of a cone.

[0033] Furthermore, in this embodiment, if Figures 1 to 5 As shown, the skirt section 8 is sealed and inserted into the pool mouth of the sewage pool 7, and the skirt section 8 is immersed in the sewage, cooperating with the check valve 3, so that the gas collecting hood 1 and the air duct 2 form a closed system, ensuring the one-way flow of gas in the air duct 2 and reducing external interference.

[0034] Height of skirt section 8 F is the area of ​​the skirt section 8.

[0035] Furthermore, in this embodiment, if Figures 1 to 5 As shown, the air duct 2 includes a vertical pipe section 10, a curved pipe section 11, and a horizontal pipe section 12. The bottom of the vertical pipe section 10 is connected to the air inlet, the top of the vertical pipe section 10 is connected to one end of the curved pipe section 11, and the other end of the curved pipe section 11 is connected to the horizontal pipe section 12. The check valve 3 is located at the end of the horizontal pipe section 12 away from the curved pipe section 11. The pressure sensor 5 is located at the top of the vertical pipe section 10, near the curved pipe section 11. The gas sensor group 4 is located on the outer wall of the vertical pipe section 10.

[0036] Furthermore, in this embodiment, if Figures 1 to 5 As shown, a rain shield 6 is provided on the top of the pipe opening of the end of the horizontal pipe section 12 away from the curved pipe section 11.

[0037] In this embodiment, Figures 1 to 5 As shown, the following is the reference model of the gas collecting hood 1 part of the sewage treatment gas composition monitoring and capture device and the requirements for the design parameters of each part:

[0038] (1) Determine the form of the gas collecting hood 1:

[0039] Since the total volume of the air flow remains unchanged during the movement, the amount of air sucked through each isovelocity surface is equal, e.g. Figure 4 If the air intake volume at the confluence point of the pipe mouth is Q, the radii of the isovelocity surfaces are r1 and r2, and the corresponding air flow velocities are v1 and v2, then the air intake volume can be expressed as:

[0040] Q=4πr1 2 v1=4πr2 2 v2①

[0041] If a baffle is added around the pipe mouth, Figure 5 As shown, the suction range is reduced by half at this time, and its constant velocity surface is a hemispherical surface. At this time, the suction volume of the point confluence at the intake pipe can be expressed as:

[0042] Q=2πr1 2 v1=2πr2 2 v2②

[0043] Comparing formulas ① and ②, it can be found that, at the same distance and producing the same suction speed, adding a baffle can save half the suction volume compared to not having a baffle. Therefore, when designing the external air collection hood 1, a higher control effect can be achieved by appropriately adding baffles. Compared to the traditional conical air collection hood 1, this device adds a rectangular skirt to the conical air collection hood 1 as a baffle, thereby forming a cone section 9 and skirt section 8 distributed vertically.

[0044] (2) Calculate the exhaust volume of the hood 1 by controlling the speed method:

[0045] In engineering design, the hood type, hood opening size, control distance x from the control point to the hood opening, and control speed v are generally determined by observing and measuring the on-site operation conditions and the emission of pollutants. x .

[0046] If the air flow velocity attenuation formula of the air inlet of the hood 1 is known, the suction velocity v at the air inlet can be calculated. 0， The following is the air inlet velocity attenuation formula and exhaust volume calculation method of the air hood 1:

[0047] (1) After a large number of experimental studies, for a gas collecting hood 1 with a circular or rectangular hood opening (width-to-length ratio W / L ≥ 0.2), the air flow velocity attenuation formula at the air inlet is:

[0048] v0 / v x =C(10x 2 +A0) / A0 ③

[0049] Where:

[0050] A0——hood area, unit is m 2 ;

[0051] v x ——Control speed, the unit is m / s.

[0052] C is a coefficient related to the structure, shape, and configuration of the hood. For a hood without a skirt, C is 1; for a hood with a skirt, C is 0.75. Studies have shown that when the total reduction of the skirt exceeds the reduction of the hood opening, there is no significant effect on the velocity field at the hood opening.

[0053] x——Control distance, in meters. The control distance refers to the distance from the farthest point within the controllable range of the suction airflow to the center of the air hood opening.

[0054] Formula ③ is only applicable to the case where x≤1.5d (d is the equivalent diameter of the air intake port). When x>1.5d, the actual velocity attenuation is greater than the calculated value.

[0055] (2) An air collecting hood 1 is set above the sewage pool 7. Due to equipment limitations, the air flow can only flow into the air collecting hood 1 from the side. To avoid lateral air flow interference, H is required to be as small as possible (the long side of the hood opening) ≤ 0.3L. The exhaust volume is calculated as follows:

[0056] Q=KPHv x ④

[0057] In the formula

[0058] Q——ventilation volume, unit is m 3 / s;

[0059] P——the circumference of the open surface of the gas hood, in meters;

[0060] H - the distance from the hood to the pollution source, in meters;

[0061] K - safety factor considering uneven velocity distribution along the height, usually K = 1.4.

[0062] Because the device needs to be installed above a treatment unit (such as an aerobic tank or anaerobic tank) in a sewage treatment plant, this design appropriately uses the upper portion of the external gas collection hood 1 as a model. To improve the device's capture efficiency and reduce the inhalation of ineffective gases, it needs to be immersed in water. A rectangular skirt should be added to the hood opening, and the shape of the lower skirt of the gas collection hood 1 should be consistent with the shape of the treatment unit pool opening. To ensure uniform airflow along the cross-section of the air duct 2, the upper hood opening (air outlet) of the gas collection hood needs to be designed as a circle.

[0063] According to formula 4, for a given total exhaust volume, the ratio of the lower to upper areas of hood 1 is inversely proportional to the flow velocity at each location. Standards stipulate that the velocity range for the lower portion of hood 1 is 0.25-2.5 m / s, while the velocity range for the upper portion is 10-15 m / s. Therefore, the ratio of the lower to upper areas of the device should be between 4 and 60 to meet the requirements.

[0064] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A sewage treatment gas component monitoring and capture device, characterized in that: It includes an air collecting hood and an air duct. The bottom of the air collecting hood is provided with an air inlet for installing the pool cover of the sewage pool inside. The top of the air collecting hood is provided with an exhaust port. The air inlet port of the air duct is connected to the exhaust port. The air outlet port of the air duct is provided with a check valve. The outer wall of the air duct is provided with a gas sensor group connected to the pipe.

2. A sewage treatment gas component monitoring and capture device according to claim 1, characterized in that: A pressure sensor connected to the inside of the air duct is provided on the outer wall of the air duct.

3. A sewage treatment gas component monitoring and capture device according to claim 2, characterized in that: The gas sensor group, the pressure sensor and the air duct are detachably connected.

4. A sewage treatment gas component monitoring and capture device according to claim 1, characterized in that: The cross section of the air duct is circular.

5. The sewage treatment gas component monitoring and capture device according to claim 1, characterized in that: The air collecting hood comprises a cone section and a skirt section which are sequentially arranged from top to bottom. The exhaust port is located at the top of the cone section, and the air inlet is located at the bottom of the skirt section.

6. A sewage treatment gas component monitoring and capture device according to claim 5, characterized in that: The skirt section is sealed and inserted into the pool opening of the sewage pool, and the skirt section is immersed in the sewage.

7. The sewage treatment gas component monitoring and capture device according to claim 1, characterized in that: The air duct includes a vertical pipe section, a curved pipe section and a horizontal pipe section. The bottom of the vertical pipe section is connected to the air inlet, the top of the vertical pipe section is connected to one end of the curved pipe section, and the other end of the curved pipe section is connected to the horizontal pipe section.

8. The sewage treatment gas component monitoring and capture device according to claim 7, characterized in that: A rain shield is provided on the top of the pipe opening of the transverse pipe section away from the curved pipe section.

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