Nitrification liquid reflux pump protection device

Abstract

The utility model relates to a nitrification liquid reflux pump protection device which comprises a liquid guide tank and a vacuum pump, the liquid guide tank is communicated with an aeration tank through a drainage pipe, the liquid guide tank is communicated with the liquid inlet end of a nitrification liquid reflux pump through a liquid conveying pipe, and the liquid guide tank is communicated with the air inlet end of the vacuum pump through an exhaust pipe; a liquid level meter used for detecting the liquid level in the liquid guide tank is arranged on the liquid guide tank, is electrically connected with the vacuum pump, transmits the liquid level condition in the liquid guide tank to a control system of the vacuum pump, and controls opening and closing of the vacuum pump through the control system of the vacuum pump; the liquid level meter is provided with a liquid level lower limit value and a liquid level upper limit value, and when the liquid level in the liquid guide tank is lower than the liquid level lower limit value set by the liquid level meter, the vacuum pump is started; and when the liquid level in the liquid guide tank reaches the liquid level upper limit value set by the liquid level meter, the vacuum pump is closed. The nitrification liquid reflux pump has the effect of protecting the nitrification liquid reflux pump.

Description

Technical Field

[0001] The utility model relates to the technical field of a nitrification liquid reflux system, in particular to a nitrification liquid reflux pump protection device. Background Art

[0002] Wastewater treatment is one of the important means to prevent and control water pollution. The choice of sewage treatment technology will directly affect the water environment quality of a region.

[0003] The nitrification liquid reflux system is the core process unit of the sewage treatment system and the most important structure for removing organic pollutants. The nitrification liquid reflux system includes a nitrification section and a denitrification section. The nitrification section uses nitrifying bacteria in the sewage to convert nitrogen compounds into nitrates under aerobic conditions, and the denitrification section uses denitrifying bacteria in the sewage to reduce nitrates into gaseous nitrogen under anoxic conditions. The sewage to be treated undergoes nitrification in the nitrification tank and then enters the denitrification tank for denitrification. The liquid in the denitrification tank is then pumped to the nitrification tank through a nitrification liquid reflux pump for circulation to ultimately remove total nitrogen. Nitrification tanks and denitrification tanks usually use aeration tanks.

[0004] In the related art, the liquid in the aeration tank contains a large amount of bubbles due to aeration. After the liquid containing bubbles enters the nitrifying liquid reflux pump through the pipeline, cavitation begins to occur at the pump impeller of the nitrifying liquid reflux pump, the pump impeller is severely worn, and the working efficiency of the nitrifying liquid reflux pump is reduced, resulting in the nitrifying liquid reflux pump being unable to meet production needs. Not only that, the economic losses caused by equipment maintenance and production shutdown are also very high. Therefore, a nitrifying liquid reflux pump protection device is urgently needed. Utility Model Content

[0005] In order to solve the above technical problems, the present application provides a nitration liquid reflux pump protection device.

[0006] The present application provides a nitration liquid reflux pump protection device adopts the following technical solution:

[0007] A nitrification liquid reflux pump protection device comprises a liquid inlet tank and a vacuum pump, wherein the liquid inlet tank is connected to an aeration tank through a drainage pipe, the liquid inlet tank is connected to a liquid inlet end of the nitrification liquid reflux pump through a liquid infusion pipe, and the liquid inlet tank is connected to an air inlet end of the vacuum pump through an exhaust pipe;

[0008] The liquid induction tank is provided with a liquid level gauge for detecting the liquid level inside the liquid induction tank, the liquid level gauge is electrically connected to the vacuum pump, the liquid level gauge transmits the liquid level in the liquid induction tank to the control system of the vacuum pump and controls the opening and closing of the vacuum pump through the control system of the vacuum pump;

[0009] The liquid level gauge is set with a lower limit value and an upper limit value of the liquid level. When the liquid level in the liquid induction tank is lower than the lower limit value set by the liquid level gauge, the vacuum pump starts; when the liquid level in the liquid induction tank reaches the upper limit value set by the liquid level gauge, the vacuum pump is turned off.

[0010] By adopting the above technical scheme, during the operation of the nitrifying liquid reflux pump, as bubbles are continuously introduced into the liquid induction tank, the liquid level in the liquid induction tank gradually decreases. When the liquid level in the liquid induction tank is lower than the lower limit value of the liquid level set by the liquid level gauge, the vacuum pump is turned on to discharge the gas in the upper part of the liquid induction tank, thereby reducing the possibility of gas entering the interior of the nitrifying liquid reflux pump and reducing the possibility of cavitation of the nitrifying liquid reflux pump. The nitrifying liquid reflux pump is protected, the working efficiency of the nitrifying liquid reflux pump is ensured, and the economic losses caused by equipment maintenance and production suspension are reduced. When the liquid level in the liquid induction tank reaches the upper limit value of the liquid level set by the liquid level gauge, the vacuum pump is turned off to keep the system running continuously and stably.

[0011] Preferably, the air outlet end of the vacuum pump is connected to the aeration tank through an air outlet pipe.

[0012] By adopting the above technical solution, the vacuum pump extracts the gas in the liquid inlet tank and pumps it back into the aeration tank, which helps to absorb the exhaust gas and achieve environmental protection control.

[0013] Preferably, a switch valve is provided on the exhaust pipe, and the liquid level gauge is also electrically connected to the switch valve. The liquid level gauge transmits the liquid level in the liquid inlet tank to the control system of the switch valve and controls the opening and closing of the switch valve through the control system of the switch valve. The switch valve is opened and closed synchronously with the vacuum pump.

[0014] By adopting the above technical solution, when the vacuum pump is not running, the switch valve remains closed, and the pipeline between the vacuum pump and the aeration tank is sealed to prevent the gas from entering the liquid induction tank through the air outlet pipe and the exhaust pipe when the air pressure in the aeration tank is greater than the air pressure in the liquid induction tank. When the vacuum pump is running, the switch valve is opened synchronously, so that the gas in the liquid induction tank can be extracted by the vacuum pump and pumped back to the aeration tank.

[0015] Preferably, the liquid outlet end of the nitrification liquid reflux pump is connected to the aeration tank through a liquid outlet pipe, and a pressure gauge is provided on the liquid outlet pipe, and the pressure gauge is used to detect the pressure of the liquid outlet pipe near the nitrification liquid reflux pump.

[0016] Preferably, a flow meter is provided on the liquid outlet pipe, and the flow meter is used to detect the flow rate in the middle of the liquid outlet pipe.

[0017] By adopting the above technical solution, the working status of the nitration liquid reflux pump is monitored by a pressure gauge and a flow meter.

[0018] In summary, this application includes the following beneficial technical effects:

[0019] During the operation of the nitrifying liquid reflux pump, as bubbles are continuously introduced into the liquid inlet tank, the liquid level in the liquid inlet tank gradually decreases. When the liquid level in the liquid inlet tank is lower than the lower limit value set by the liquid level gauge, the vacuum pump starts to discharge the gas on the upper part of the liquid inlet tank, thereby reducing the possibility of gas entering the nitrifying liquid reflux pump and reducing the possibility of cavitation of the nitrifying liquid reflux pump. This protects the nitrifying liquid reflux pump, ensures its working efficiency, and reduces economic losses caused by equipment maintenance and production shutdowns. When the liquid level in the liquid inlet tank reaches the upper limit value set by the liquid level gauge, the vacuum pump shuts down to keep the system running continuously and stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of a nitration liquid reflux pump protection device in an embodiment of the present application.

[0021] Explanation of the reference numerals: 1. aeration tank; 11. denitrification tank; 12. nitrification tank; 2. liquid inlet tank; 21. drainage pipe; 22. liquid infusion pipe; 23. exhaust pipe; 231. switch valve; 24. liquid level meter; 3. vacuum pump; 31. outlet pipe; 4. nitrification liquid reflux pump; 41. liquid outlet pipe; 411. pressure gauge; 412. flow meter. DETAILED DESCRIPTION

[0022] The following is combined with Figure 1 This application is described in further detail.

[0023] The embodiment of the present application discloses a nitrification liquid reflux pump protection device.

[0024] Reference Figure 1 The aeration tank 1 is divided into a denitrification tank 11 and a nitrification tank 12. The nitrification liquid reflux pump protection device includes a liquid induction tank 2 and a vacuum pump 3. The liquid induction tank 2 is connected to the denitrification tank 11 in the aeration tank 1 through a drainage pipe 21. The liquid induction tank 2 is connected to the liquid inlet end of the nitrification liquid reflux pump 4 through a liquid infusion pipe 22. The liquid induction tank 2 is connected to the air inlet end of the vacuum pump 3 through an exhaust pipe 23.

[0025] A liquid level gauge 24 is provided on the liquid inlet tank 2 for detecting the liquid level inside the liquid inlet tank 2. The liquid level gauge 24 is electrically connected to the vacuum pump 3. The liquid level gauge 24 transmits the liquid level in the liquid inlet tank 2 to the control system of the vacuum pump 3 and controls the opening and closing of the vacuum pump 3 through the control system of the vacuum pump 3.

[0026] The liquid level gauge 24 sets a lower limit value and an upper limit value of the liquid level. When the liquid level in the liquid inlet tank 2 is lower than the lower limit value set by the liquid level gauge 24, the vacuum pump 3 starts; when the liquid level in the liquid inlet tank 2 reaches the upper limit value set by the liquid level gauge 24, the vacuum pump 3 is turned off.

[0027] During the operation of the nitrifying liquid reflux pump 4, as bubbles are continuously introduced into the liquid inlet tank 2, the liquid level in the liquid inlet tank 2 gradually decreases. When the liquid level in the liquid inlet tank 2 is lower than the lower limit value of the liquid level set by the liquid level gauge 24, the vacuum pump 3 is turned on, and the vacuum pump 3 discharges the gas in the upper part of the liquid inlet tank 2, thereby reducing the possibility of gas entering the nitrifying liquid reflux pump 4 and reducing the possibility of cavitation of the nitrifying liquid reflux pump 4. This protects the nitrifying liquid reflux pump 4, ensures the working efficiency of the nitrifying liquid reflux pump 4, and reduces the economic losses caused by equipment maintenance and production shutdown. When the liquid level in the liquid inlet tank 2 reaches the upper limit value of the liquid level set by the liquid level gauge 24, the vacuum pump 3 is turned off to keep the system running continuously and stably.

[0028] The gas outlet of the vacuum pump 3 is connected to the denitrification tank 11 in the aeration tank 1 through the gas outlet pipe 31. The vacuum pump 3 extracts the gas in the liquid inlet tank 2 and pumps it back into the aeration tank 1, which is helpful for waste gas absorption and environmental protection control.

[0029] A switch valve 231 is provided on the exhaust pipe 23, and the liquid level gauge 24 is also electrically connected to the switch valve 231. The liquid level gauge 24 transmits the liquid level in the liquid inlet tank 2 to the control system of the switch valve 231 and controls the opening and closing of the switch valve 231 through the control system of the switch valve 231. The switch valve 231 is opened and closed synchronously with the vacuum pump 3.

[0030] When the vacuum pump 3 is not in operation, the switch valve 231 remains closed, and the pipeline between the vacuum pump 3 and the aeration tank 1 is sealed to prevent the gas from entering the liquid induction tank 2 from the aeration tank 1 through the outlet pipe 31 and the exhaust pipe 23 when the air pressure in the aeration tank 1 is greater than the air pressure in the liquid induction tank 2. When the vacuum pump 3 is in operation, the switch valve 231 is opened synchronously, so that the gas in the liquid induction tank 2 can be extracted by the vacuum pump 3 and pumped back to the aeration tank 1.

[0031] The liquid outlet of the nitrification liquid reflux pump 4 is connected to the nitrification tank 12 in the aeration tank 1 through the liquid outlet pipe 41. The liquid outlet pipe 41 is provided with a pressure gauge 411, which is used to detect the pressure of the liquid outlet pipe 41 near the nitrification liquid reflux pump 4. The liquid outlet pipe 41 is provided with a flow meter 412, which is used to detect the flow rate in the middle of the liquid outlet pipe 41. The working state of the nitrification liquid reflux pump 4 is monitored by the pressure gauge 411 and the flow meter 412.

[0032] The present embodiment shows the circulation stage of the denitrification section-nitrification section. The nitrification liquid reflux pump protection device of the present application is also applicable to the nitrification section-denitrification section stage. During the nitrification section-denitrification section process, the drainage pipe 21 of the liquid induction tank 2 is connected to the nitrification tank 12, the vacuum pump 3 is connected to the nitrification tank 12 through the air outlet pipe 31, and the nitrification liquid reflux pump 4 is connected to the denitrification tank 11 through the liquid outlet pipe 41.

[0033] The implementation principle of a nitration liquid reflux pump protection device in the embodiment of the present application is:

[0034] During the operation of the nitrifying liquid reflux pump 4, as bubbles are continuously introduced into the liquid inlet tank 2, the liquid level in the liquid inlet tank 2 gradually decreases. When the liquid level in the liquid inlet tank 2 is lower than the lower limit value of the liquid level set by the liquid level gauge 24, the vacuum pump 3 is turned on, and the vacuum pump 3 discharges the gas in the upper part of the liquid inlet tank 2, thereby reducing the possibility of gas entering the nitrifying liquid reflux pump 4 and reducing the possibility of cavitation of the nitrifying liquid reflux pump 4. This protects the nitrifying liquid reflux pump 4, ensures the working efficiency of the nitrifying liquid reflux pump 4, and reduces the economic losses caused by equipment maintenance and production shutdown. When the liquid level in the liquid inlet tank 2 reaches the upper limit value of the liquid level set by the liquid level gauge 24, the vacuum pump 3 is turned off to keep the system running continuously and stably.

[0035] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A nitration liquid reflux pump protection device, characterized in that: The invention comprises a liquid inlet tank (2) and a vacuum pump (3), wherein the liquid inlet tank (2) is connected to the aeration tank (1) via a drainage pipe (21), the liquid inlet tank (2) is connected to the liquid inlet end of a nitrification liquid reflux pump (4) via a liquid infusion pipe (22), and the liquid inlet tank (2) is connected to the air inlet end of the vacuum pump (3) via an exhaust pipe (23); The liquid inlet tank (2) is provided with a liquid level meter (24) for detecting the liquid level inside the liquid inlet tank (2); the liquid level meter (24) is electrically connected to the vacuum pump (3); the liquid level meter (24) transmits the liquid level inside the liquid inlet tank (2) to the control system of the vacuum pump (3) and controls the start and stop of the vacuum pump (3) through the control system of the vacuum pump (3); The liquid level meter (24) is provided with a lower limit value and an upper limit value of the liquid level. When the liquid level in the liquid inlet tank (2) is lower than the lower limit value of the liquid level set by the liquid level meter (24), the vacuum pump (3) is started; when the liquid level in the liquid inlet tank (2) reaches the upper limit value of the liquid level set by the liquid level meter (24), the vacuum pump (3) is shut down.

2. The nitration liquid reflux pump protection device according to claim 1, characterized in that: The air outlet end of the vacuum pump (3) is connected to the aeration tank (1) via an air outlet pipe (31).

3. The nitration liquid reflux pump protection device according to claim 1, characterized in that: The exhaust pipe (23) is provided with an on-off valve (231), and the liquid level meter (24) is also electrically connected to the on-off valve (231). The liquid level meter (24) transmits the liquid level in the liquid inlet tank (2) to the control system of the on-off valve (231) and controls the opening and closing of the on-off valve (231) through the control system of the on-off valve (231). The on-off valve (231) is opened and closed synchronously with the vacuum pump (3).

4. The nitration liquid reflux pump protection device according to claim 1, characterized in that: The liquid outlet end of the nitrifying liquid reflux pump (4) is connected to the aeration tank (1) via a liquid outlet pipe (41). A pressure gauge (411) is provided on the liquid outlet pipe (41). The pressure gauge (411) is used to detect the pressure at the liquid outlet pipe (41) close to the nitrifying liquid reflux pump (4).

5. The nitrification liquid reflux pump protection device according to claim 4, characterized in that: The liquid outlet pipe (41) is provided with a flow meter (412), and the flow meter (412) is used to detect the flow rate in the middle of the liquid outlet pipe (41).

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