An online detachable gas lift backflow device

Abstract

This utility model relates to the field of wastewater treatment technology, specifically an online detachable gas lift and reflux device. It includes: a gas lift tank body, in which the reflux liquid undergoes gas-liquid separation; an exhaust valve located at the upper end of the gas lift tank body; a liquid inlet and a liquid outlet located on opposite sides of the gas lift tank body, with the liquid inlet higher than the liquid outlet; a suction pipe, one end connected to the liquid inlet and the other end inserted into the reflux liquid; and an air inlet pipe, the lower end connected to the end of the suction pipe inserted into the reflux liquid, and the upper end connected to an air supply system. The air inlet pipe is connected to the air supply system via a quick-connect fitting. The liquid inlet is connected to the suction pipe via a quick-connect fitting, and the liquid outlet is connected to the reflux point via a quick-connect fitting. A horn-shaped flow guide is provided at the lower end of the suction pipe. The end of the air inlet pipe connected to the suction pipe is vertically positioned upwards inside the suction pipe and coaxially arranged with it. Its structure is simple and compact, reducing component damage caused by mechanical wear and extending its service life.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to an online detachable gas lifting and reflux device. Background Technology

[0002] With the improvement of living standards, the total nitrogen level in domestic sewage is increasing. According to the relevant provisions of the "Outdoor Drainage Design Standard (GB50014-2021)," the total nitrogen content in domestic sewage has increased from 5-11g per person per day to 8-12g per person per day. In sewage treatment systems, the biological system needs to consider the return of sludge and nitrification liquid to achieve biological denitrification. Sludge return is to ensure the sludge concentration of the system and improve the operational stability of the system. Nitrification liquid return involves returning the nitrification liquid from the aerobic tank to the anoxic tank. Heterotrophic denitrifying bacteria use organic matter as an electron donor to return the returned nitrate (NO3) to the anoxic tank. - The nitrogen gas is reduced to nitrogen (N2) and discharged, thus achieving denitrification. According to the relevant provisions in the "Outdoor Drainage Design Standard (GB50014-2021)," the general sludge return flow rate is 50% to 100% of the design water volume, and the nitrification liquid return flow rate is 100% to 400% of the design water volume, resulting in a large return flow rate.

[0003] Traditional sludge recirculation and nitrification liquor recirculation both employ mechanical lifting, such as dry centrifugal pumps, through-wall pumps, and axial flow pumps. Depending on the project implementation, recirculation requires consideration of local elevation losses as well as friction losses along the pipeline, with a total loss of approximately 1.0 meter. Currently, dry centrifugal pumps are easy to maintain and repair, but their head is typically above 5 meters, resulting in high energy consumption and resource waste. Through-wall pumps and axial flow pumps are both high-flow, low-head pumps, with relatively lower energy consumption compared to centrifugal pumps, but they require high-quality materials, involve large project investments, and their motors operate submerged, making maintenance and repair difficult. Utility Model Content

[0004] To address the technical problems existing in the background art, this utility model provides an online detachable gas lifting and reflux device, which has a simple and compact structure, reduces component damage caused by mechanical wear, and extends service life.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] An online detachable gas lift and reflux device includes:

[0007] The stripping tank is where the reflux liquid undergoes gas-liquid separation.

[0008] An exhaust valve is located at the upper end of the air-lift tank.

[0009] The liquid inlet and liquid outlet are respectively located on both sides of the stripping tank, with the liquid inlet being higher than the liquid outlet.

[0010] The suction tube is connected at one end to the inlet and the other end is inserted into the reflux liquid;

[0011] The air inlet pipe is connected at its lower end to the end of the suction pipe that is inserted into the return liquid, and at its upper end to the air supply system.

[0012] Furthermore, the intake pipe is connected to the air supply system via an intake pipe quick-connect fitting.

[0013] Furthermore, the air supply system is a blower.

[0014] Furthermore, the intake pipe is equipped with a shut-off valve.

[0015] Furthermore, a check valve is installed in the intake pipe.

[0016] Furthermore, the inlet is connected to the suction pipe via an inlet quick-connect fitting, and the outlet is connected to the reflux point via an outlet quick-connect fitting.

[0017] Furthermore, a horn-shaped flow guide is installed at the lower end of the suction tube.

[0018] Furthermore, the end of the air inlet pipe that connects to the liquid suction pipe is placed vertically upward inside the liquid suction pipe and is coaxially arranged with the liquid suction pipe.

[0019] The beneficial effects of this utility model are:

[0020] (1) Using external gas as an energy source saves electricity consumption, reduces operating costs, and meets energy-saving requirements.

[0021] (2) No mechanical structure, reducing component damage caused by mechanical wear and extending service life.

[0022] (3) The equipment has a simple and compact structure, few parts, low material requirements, and carbon steel corrosion protection is sufficient to meet the needs, resulting in low daily maintenance and replacement costs.

[0023] (4) The liquid inlet, liquid outlet and air inlet pipe are all connected by snap-fit ​​quick-installation and quick-plug connection, which makes on-site installation and disassembly difficult and facilitates online inspection and maintenance.

[0024] (5) The gas supply system is equipped with a shut-off valve to adjust the return flow by controlling the amount of gas entering the suction pipe.

[0025] (6) The gas supply system is equipped with a check valve to prevent sewage from entering the gas supply network and causing secondary pollution, and to protect the safe operation of subsequent gas supply equipment. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] Figure 1This is a schematic diagram of the structure of this utility model;

[0028] Figure 2 yes Figure 1 A magnified view of a portion of location A in the middle.

[0029] In the picture:

[0030] 1. Air lifting tank body; 2. Exhaust valve; 3. Liquid inlet; 4. Liquid outlet; 5. Quick-connect fitting for liquid inlet; 6. Quick-connect fitting for liquid outlet; 7. Suction pipe; 8. Horn guide cover; 9. Air inlet pipe; 10. Quick-connect fitting for air inlet pipe; 11. Check valve; 12. Shut-off valve. Detailed Implementation

[0031] The present invention will be further described in detail below with reference to the accompanying drawings.

[0032] like Figure 1 As shown, an online detachable gas lift and reflux device includes a gas lift tank 1, within which the reflux liquid undergoes gas-liquid separation. An exhaust valve 2 is located at the upper end of the gas lift tank 1 to discharge accumulated gas. An inlet 3 and an outlet 4 are located on opposite sides of the gas lift tank 1, with the inlet 3 positioned higher than the outlet 4. The reflux liquid enters the gas lift tank 1 through the inlet 3. The reflux liquid in the gas lift tank 1 is discharged to the reflux point through the outlet 4.

[0033] The upper end of the suction pipe 7 is connected to the liquid inlet 3, and the lower end is inserted into the return liquid. The lower end of the air inlet pipe 9 is connected to the end of the suction pipe 7 inserted into the return liquid, and the upper end is connected to the air supply system. In specific implementation, the air supply system is a blower. Using external gas as an energy source can save electricity consumption, reduce operating costs, and meet energy-saving requirements. Furthermore, the absence of mechanical structures reduces component damage caused by mechanical wear, extending service life. The equipment has a simple and compact structure, few parts, and low material requirements; corrosion-resistant carbon steel is sufficient, resulting in low daily maintenance and replacement costs.

[0034] The lower end of the suction tube 7 is equipped with a horn-shaped flow guide 8, which allows the return liquid to enter the suction tube 7 more smoothly.

[0035] The air inlet pipe 9 is connected to the air supply system via the air inlet quick-connect fitting 10. The liquid inlet 3 is connected to the liquid suction pipe 7 via the liquid inlet quick-connect fitting 5, and the liquid outlet 4 is connected to the return point via the liquid outlet quick-connect fitting 6. The liquid inlet 3, the liquid outlet 4, and the air inlet pipe 9 all use snap-fit ​​quick-connect connections, which are easy to install and disassemble on site and facilitate online inspection and maintenance.

[0036] The air inlet pipe 9 is equipped with a shut-off valve 12 and a check valve 11 to adjust the return flow by controlling the amount of air entering the liquid suction pipe 7 and to prevent sewage from entering the air supply network.

[0037] like Figure 2 As shown, the specific structure at the connection between the air inlet pipe 9 and the liquid suction pipe 7 is as follows: one end of the air inlet pipe 9 connected to the liquid suction pipe 7 is placed vertically upward inside the liquid suction pipe 7 and is coaxially arranged with the liquid suction pipe 7. This structure ensures that the gas in the air inlet pipe 9 can better drive the return liquid in the liquid suction pipe 7 to flow upward.

[0038] The working method is as follows:

[0039] The core of a gas lift-back system is the gas source, which is typically compressed air or an aerator blower. The gas source needs to have sufficient pressure and flow rate to meet process requirements.

[0040] Gas is delivered into the suction pipe 7 through the air inlet pipe 9. The low density of the gas creates an upward buoyancy, which reduces the internal pressure of the suction pipe 7. The return liquid in the suction pipe 7 is propelled upward along the suction pipe 7 by the pressure difference between the inside and outside until it enters the gas stripping tank 1. A gas-liquid separator is formed in the gas stripping tank 1. The separated gas is discharged through the exhaust valve 2, and the remaining return liquid enters the subsequent return point through the liquid outlet 4 to achieve the purpose of return.

[0041] The reflux liquid undergoes gas-liquid separation within the stripping tank 1, which effectively reduces the oxygen content in the reflux liquid, effectively protects the dissolved oxygen environment in the subsequent anaerobic or anoxic zone, and improves the denitrification effect.

[0042] A shut-off valve 12 and a check valve 11 are installed on the air inlet pipe 9 to adjust the return flow by controlling the amount of air entering the liquid suction pipe 7 and to prevent sewage from entering the air supply network.

[0043] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. An online detachable gas lifting and reflux device, characterized in that, include: The gas-lift tank (1) is used for gas-liquid separation of the reflux liquid. An exhaust valve (2) is located at the upper end of the gas lifting tank (1); The liquid inlet (3) and the liquid outlet (4) are respectively located on both sides of the gas stripping tank (1), with the liquid inlet (3) being higher than the liquid outlet (4). The suction tube (7) is connected at one end to the inlet (3) and the other end is inserted into the reflux liquid; The lower end of the air inlet pipe (9) is connected to the end of the suction pipe (7) that is inserted into the reflux liquid, and the upper end is connected to the air supply system.

2. The online detachable gas lifting and reflux device according to claim 1, characterized in that, The air intake pipe (9) is connected to the air supply system via the air intake pipe quick-connect fitting (10).

3. The online detachable gas lifting and reflux device according to claim 1, characterized in that, The air supply system is a blower.

4. The online detachable gas lifting and reflux device according to claim 1, characterized in that, The air intake pipe (9) is equipped with a shut-off valve (12).

5. The online detachable gas lifting and reflux device according to claim 1, characterized in that, The air intake pipe (9) is equipped with a check valve (11).

6. The online detachable gas lifting and reflux device according to claim 1, characterized in that, The inlet (3) is connected to the suction pipe (7) through the quick-connect fitting (5), and the outlet (4) is connected to the return point through the quick-connect fitting (6).

7. The online detachable gas lifting and reflux device according to claim 1, characterized in that, The lower end of the suction tube (7) is provided with a horn-shaped flow guide (8).

8. The online detachable gas lifting and reflux device according to claim 1, characterized in that, One end of the air inlet pipe (9) that connects to the liquid suction pipe (7) is placed vertically upward inside the liquid suction pipe (7) and is coaxially arranged with the liquid suction pipe (7).

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