Backwashing device for coal-containing wastewater centrifugal clarifier and control method thereof

Abstract

The invention relates to a backwash device for a coal-containing wastewater centrifugal clarifier and a control method thereof, the device comprises a reuse water tank, the reuse water tank is connected with a centrifugal clarifier backwash water pump, the centrifugal clarifier backwash water pump is connected with a centrifugal clarifier backwash water pump electric water inlet valve, and the centrifugal clarifier backwash water pump electric water inlet valve is connected with the reuse water tank. One end of a centrifugal clarifier backwashing water pump electric water inlet valve is connected with a backwashing channel, one end of the backwashing channel is arranged in a centrifugal clarifier, the centrifugal clarifier is connected with an electronic flocculator through a centrifugal clarifier electric water inlet valve, and the centrifugal clarifier is connected with a middle water pool through a centrifugal clarifier electric water outlet valve. And a turbidity meter is arranged at the outlet of the middle water tank. Compared with the prior art, the centrifugal clarifier has the advantages that impurities attached to the inner wall of the centrifugal clarifier and filler are removed, and the treatment effect of the centrifugal clarifier is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of centrifugal clarifiers, in particular to a backwashing device for a centrifugal clarifier of coal-containing wastewater and a control method thereof. Background Art

[0002] Centrifugal clarifiers are mainly used in coal-containing wastewater treatment systems such as Figure 1 As shown. The centrifugal clarification reaction device consists of a main body and internal fillers. It uses the centrifugal principle in hydraulics. The water flows into the reactor along the tangential direction and makes a spiral motion. Under the action of centrifugal force, the particles are attached to the separator wall and internal fillers. Under the action of gravity, the separated particles will flow downstream against the water and finally accumulate at the bottom of the device. The sludge is discharged by regularly opening the electric drain valve of the centrifugal clarifier. The water after centrifugal separation is effectively separated from the reaction substances. Figure 2 As shown in the figure, water treated by the electronic flocculator enters the centrifugal clarifier directly. The centrifugal clarifier's wastewater is discharged only periodically through the bottom drain valve, with water flowing downward and outward. However, during operation, centrifugal forces cause particles, including silt and organic matter, to adhere to the separator walls and internal packing. Regularly opening the bottom drain valve alone cannot completely remove debris from the centrifugal clarifier's inner walls and packing, resulting in poor treatment performance over time. Summary of the Invention

[0003] The purpose of the present invention is to provide a backwashing device and a control method for a centrifugal clarifier for coal-containing wastewater in order to remove debris attached to the inner wall and filler of the centrifugal clarifier and improve the treatment effect of the centrifugal clarifier.

[0004] The purpose of the present invention can be achieved by the following technical solutions:

[0005] A backwash device for a centrifugal clarifier of coal-containing wastewater, the device comprising a reuse water pool, the reuse water pool being connected to a backwash water pump of the centrifugal clarifier, the backwash water pump of the centrifugal clarifier being connected to an electric water inlet valve of the centrifugal clarifier backwash water pump, one end of the electric water inlet valve of the centrifugal clarifier backwash water pump being connected to a backwash channel, one end of the backwash channel being arranged inside the centrifugal clarifier, the centrifugal clarifier being connected to an electronic flocculator via the electric water inlet valve of the centrifugal clarifier, the centrifugal clarifier being connected to an intermediate water pool via the electric water outlet valve of the centrifugal clarifier, and a turbidity meter being provided at the outlet of the intermediate water pool.

[0006] Furthermore, the backwash channel is a first backwash channel, a second backwash channel and a third backwash channel arranged in parallel.

[0007] Furthermore, a plurality of parallelly arranged annular structures are provided on the backwash channel, and the annular structures are composed of nozzles surrounding the backwash channel.

[0008] Furthermore, a centrifugal clarifier electric drain valve and a centrifugal clarifier manual drain valve are provided below the centrifugal clarifier.

[0009] Furthermore, the electronic flocculator is connected to a coal-water lifting pump.

[0010] Furthermore, a check valve is connected between the centrifugal clarifier backwash water pump and the electric water inlet valve of the centrifugal clarifier backwash water pump.

[0011] Furthermore, a liquid level meter is provided on the reuse water pool.

[0012] Furthermore, a liquid level gauge is provided on the intermediate water tank.

[0013] Another aspect of the present invention provides a control method for a backwashing device for a centrifugal clarifier of coal-containing wastewater. The method is based on the above-mentioned backwashing device and includes the following steps:

[0014] S1: Obtain the turbidity at the outlet of the intermediate water tank of the turbidity meter. If the turbidity is higher than the threshold, execute S2; otherwise, the electronic flocculator continues to operate normally.

[0015] S2. Stop the coal-water lifting pump, then stop the electronic flocculator, close the electric water inlet valve of the centrifugal clarifier, and then close the electric water outlet valve of the centrifugal clarifier;

[0016] S2. Open the electric drain valve of the centrifugal clarifier and start the backwash water pump of the centrifugal clarifier;

[0017] S3. Open the electric water inlet valve of the centrifugal clarifier backwash water pump. The water in the recycling water pool is pumped out by the centrifugal clarifier backwash water pump, enters the backwash channel through the electric water inlet valve of the centrifugal clarifier backwash water pump, and flushes the centrifugal clarifier through the nozzle. The flushed water is discharged outward through the electric sewage valve of the centrifugal clarifier. After maintaining the electric water inlet valve of the centrifugal clarifier backwash water pump open for a certain period of time, close the electric water inlet valve of the centrifugal clarifier backwash water pump, then close the centrifugal clarifier backwash water pump, then close the electric sewage valve of the centrifugal clarifier, open the electric water inlet valve of the centrifugal clarifier, then open the electric water outlet valve of the centrifugal clarifier, and then open the coal-water lifting pump. The electronic flocculator continues to operate. At this time, obtain the turbidity of the intermediate water pool outlet. If the turbidity is less than or equal to the threshold, end the backwashing, otherwise return to S2.

[0018] Another aspect of the present invention provides a computer-readable storage medium having a program stored thereon, wherein the program implements the above method when executed.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention adds a centrifugal clarifier backwash pump. Clean water or high-pressure water flows through the centrifugal clarifier's electric backwash inlet valve. Then, through three backwash pipes, pressurized clean water is introduced into the centrifugal clarifier's inner wall and packing holes. This water circulates continuously until the output of the turbidity meter at the outlet of the intermediate water tank falls below a threshold. The centrifugal clarifier backwash pump is then stopped, and debris inside the centrifugal clarifier is thoroughly cleaned. The water is then discharged to the coal slime sedimentation tank through the bottom electric drain valve. Furthermore, the present invention adds a centrifugal clarifier electric outlet valve at the centrifugal clarifier outlet, effectively preventing backwash impurities from entering the intermediate water tank, thereby ensuring the quality of the water entering the intermediate water tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural diagram of an existing coal-containing wastewater treatment system;

[0022] Figure 2 This is a schematic diagram showing that the water treated by the existing electronic flocculator directly enters the centrifugal clarifier;

[0023] Figure 3 The backwashing device for the centrifugal clarifier of coal-containing wastewater of the present invention;

[0024] Figure 4 is a flow chart of the present invention;

[0025] In the figure, the first backwash channel 1, the second backwash channel 2, the third backwash channel 3, the reuse water tank 4, the centrifugal clarifier backwash water pump 5, the centrifugal clarifier backwash water pump electric water inlet valve 6, the centrifugal clarifier 7, the centrifugal clarifier electric water inlet valve 8, the electronic flocculator 9, the centrifugal clarifier electric water outlet valve 10, the intermediate water tank 11, the turbidity meter 12, the annular structure 13, the nozzle 14, the centrifugal clarifier electric drain valve 15, the centrifugal clarifier manual drain valve 16, and the check valve 17. DETAILED DESCRIPTION

[0026] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0027] The present invention proposes a backwash device for a centrifugal clarifier of coal-containing wastewater, the structure of which is shown in FIG. Figure 3As shown, the device includes a reuse water pool 4, the reuse water pool 4 is connected to the centrifugal clarifier backwash water pump 5, the centrifugal clarifier backwash water pump 5 is connected to the centrifugal clarifier backwash water pump electric water inlet valve 6, one end of the centrifugal clarifier backwash water pump electric water inlet valve 6 is connected to the backwash channel, one end of the backwash channel is arranged inside the centrifugal clarifier 7, the centrifugal clarifier 7 is connected to the electronic flocculator 9 through the centrifugal clarifier electric water inlet valve 8, the centrifugal clarifier 7 is connected to the intermediate water pool 11 through the centrifugal clarifier electric water outlet valve 10, and the outlet of the intermediate water pool 11 is provided with a turbidity meter 12.

[0028] The backwash channels include a first backwash channel 1 , a second backwash channel 2 and a third backwash channel 3 which are arranged in parallel.

[0029] A plurality of parallel annular structures 13 are provided on the backwash channel. The annular structure 13 is composed of nozzles 14 surrounding the backwash channel.

[0030] A centrifugal clarifier electric drain valve 15 and a centrifugal clarifier manual drain valve 16 are provided below the centrifugal clarifier 7 .

[0031] The electronic flocculator 9 is connected to the coal-water lifting pump.

[0032] A check valve 17 is connected between the centrifugal clarifier backwash water pump 5 and the centrifugal clarifier backwash water pump electric water inlet valve 6 .

[0033] The recycled water pool 4 is provided with a liquid level gauge.

[0034] The intermediate water tank 11 is provided with a liquid level gauge.

[0035] The present invention also proposes a control method for a backwashing device for a centrifugal clarifier of coal-containing wastewater. The method is based on the above-mentioned backwashing device and includes the following steps:

[0036] S1, obtain the turbidity of the intermediate water tank outlet of the turbidity meter 12. If the turbidity is higher than the threshold, execute S2; otherwise, the electronic flocculator 9 continues to operate normally;

[0037] S2. Stop the coal-water lifting pump, then stop the electronic flocculator 9, close the electric water inlet valve 8 of the centrifugal clarifier, and then close the electric water outlet valve 10 of the centrifugal clarifier;

[0038] S2, open the electric drain valve 15 of the centrifugal clarifier and start the backwash water pump 5 of the centrifugal clarifier;

[0039] S3. Open the electric water inlet valve 6 of the centrifugal clarifier backwash water pump. The water in the recycling water pool 4 is pumped out by the centrifugal clarifier backwash water pump 5, enters the backwash channel through the centrifugal clarifier backwash water pump electric water inlet valve 6, and flushes the centrifugal clarifier 7 through the nozzle 14. The flushed water is discharged outward through the centrifugal clarifier electric sewage valve 15. After maintaining the centrifugal clarifier backwash water pump electric inlet valve 6 in the open state for a certain period of time, close the centrifugal clarifier backwash water pump electric inlet valve 6, then close the centrifugal clarifier backwash water pump 5, then close the centrifugal clarifier electric sewage valve 15, open the centrifugal clarifier electric water inlet valve 8, then open the centrifugal clarifier electric water outlet valve 10, and then open the coal-water lifting pump. The electronic flocculator 9 continues to operate. At this time, the turbidity of the intermediate water pool outlet is obtained. If the turbidity is less than or equal to the threshold, the backwash is ended. Otherwise, return to S2.

[0040] The present invention also provides a computer-readable storage medium having a program stored thereon, which implements the above method when the program is executed.

[0041] like Figure 3 As shown in red, the newly added centrifugal clarifier backwash device in the present invention takes water from the recycled water pool, pressurizes it through the centrifugal clarifier backwash water pump, and sends it to the three backwash water pipes of the centrifugal clarifier through the electric water inlet valve and sprays it out through the built-in nozzles of the water pipes. The flushing water is discharged to the coal slime sedimentation tank through the bottom drain valve.

[0042] An electric inlet valve and an electric outlet valve are added at the inlet and outlet of the centrifugal clarifier. These two valves are closed during backwashing operation to prevent backwash impurities from entering the intermediate water pool.

[0043] The system consists of a centrifugal clarifier backwash pump, a check valve, an electric inlet valve, an electric outlet valve, a turbidity meter at the intermediate tank outlet, backwash piping, nozzles, and a control system. The control system automatically initiates the backwash process when the turbidity meter at the intermediate tank outlet exceeds 30 NTU.

[0044] The backwashing operation of the centrifugal clarifier is manual and automatic.

[0045] 1. For manual operation, turn the knob of the on-site PLC cabinet to manual, click the manual control interface on the touch screen, and click the centrifugal clarifier backwash pump. When the backwash pump starts, the centrifugal clarifier is being flushed.

[0046] 2. Automatic: When the turbidity meter at the outlet of the intermediate water tank is greater than 30NTU, the control system will automatically start the backwash program.

[0047] After the system equipment stops automatically (the raw coal water lifting pump and the electronic flocculator stop working), the centrifugal clarifier backwash water pump starts and flushing is in progress.

[0048] (1) Add a backwash water pump to the centrifugal clarifier to first pass the clean water or high-pressure water flow through the centrifugal clarifier backwash electric water inlet valve and then through three backwash pipes to introduce the pressurized clean water into the inner wall and filler hole of the centrifugal clarifier. The water flows in and out continuously until the turbidity meter at the outlet of the middle water tank is ≤30NTU. Then stop the backwash water pump of the centrifugal clarifier, thoroughly clean the internal debris of the centrifugal clarifier, and discharge it to the coal slime sedimentation tank through the bottom electric drain valve.

[0049] The commonly used method for flushing centrifugal clarifiers is to regularly open the bottom drain valve, and then flow water in and out for flushing. However, this method cannot remove debris attached to the inner wall and filler of the centrifugal clarifier. The present invention adopts reverse flushing, with water flowing from top to bottom. Combined with the commonly used flushing method, a flushing method combining top-down and bottom-up is adopted in the centrifugal clarifier, which can significantly improve the cleaning effect and efficiency through the synergistic effect of multi-directional water flow.

[0050] Single-direction water flow may have difficulty penetrating due to angle issues. However, when flushing in multiple directions, water can flow from two directions, breaking down residual materials in the gaps.

[0051] The up and down in the present invention refers to the height of the horizontal position. Figure 2 As can be seen in the figure, the existing water flow direction of in-and-out means that the level of the flocculator entering the centrifugal clarifier is lower, and the level of the centrifugal clarifier to the intermediate water tank is higher. The same applies to the bottom-in and top-out.

[0052] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art through logical analysis, reasoning, or limited experimentation based on the concepts of the present invention and the prior art should be within the scope of protection defined by the claims.

Claims

1. A backwashing device for a centrifugal clarifier of coal-containing wastewater, characterized in that: The device comprises a recycling water pool (4), wherein the recycling water pool (4) is connected to a centrifugal clarifier backwash water pump (5), wherein the centrifugal clarifier backwash water pump (5) is connected to a centrifugal clarifier backwash water pump electric water inlet valve (6), one end of the centrifugal clarifier backwash water pump electric water inlet valve (6) is connected to a backwash channel, one end of the backwash channel is arranged inside a centrifugal clarifier (7), the centrifugal clarifier (7) is connected to an electronic flocculator (9) via a centrifugal clarifier electric water inlet valve (8), the centrifugal clarifier (7) is connected to an intermediate water pool (11) via a centrifugal clarifier electric water outlet valve (10), and a turbidity meter (12) is provided at the outlet of the intermediate water pool (11).

2. A backwashing device for a centrifugal clarifier of coal-containing wastewater according to claim 1, characterized in that: The backwash channels are a first backwash channel (1), a second backwash channel (2) and a third backwash channel (3) arranged in parallel.

3. The backwashing device for a centrifugal clarifier of coal-containing wastewater according to claim 2, characterized in that: A plurality of parallel-arranged annular structures (13) are provided on the backwash channel, and the annular structure (13) is composed of nozzles (14) surrounding the backwash channel.

4. The backwashing device for a centrifugal clarifier of coal-containing wastewater according to claim 1, characterized in that: A centrifugal clarifier electric drain valve (15) and a centrifugal clarifier manual drain valve (16) are provided below the centrifugal clarifier (7).

5. The backwashing device for a centrifugal clarifier of coal-containing wastewater according to claim 1, characterized in that: The electronic flocculator (9) is connected to the coal-water lifting pump.

6. The backwashing device for a centrifugal clarifier of coal-containing wastewater according to claim 1, characterized in that: A check valve (17) is connected between the centrifugal clarifier backwash water pump (5) and the centrifugal clarifier backwash water pump electric water inlet valve (6).

7. The backwashing device for a centrifugal clarifier of coal-containing wastewater according to claim 1, characterized in that: The recycled water pool (4) is provided with a liquid level meter.

8. The backwashing device for a centrifugal clarifier of coal-containing wastewater according to claim 1, characterized in that: The intermediate water tank (11) is provided with a liquid level gauge.

9. A control method for a backwash device of a centrifugal clarifier for coal-containing wastewater, characterized in that: The method is based on the backwash device according to any one of claims 1 to 8, and comprises the following steps: S1, obtaining the turbidity at the outlet of the intermediate water tank of the turbidity meter (12), if the turbidity is higher than the threshold, executing S2, otherwise the electronic flocculator (9) continues to operate normally; S2, stop the coal-water lifting pump, then stop the electronic flocculator (9), close the electric water inlet valve (8) of the centrifugal clarifier, and then close the electric water outlet valve (10) of the centrifugal clarifier; S2, open the electric drain valve (15) of the centrifugal clarifier and start the backwash water pump (5) of the centrifugal clarifier; S3, open the electric water inlet valve (6) of the centrifugal clarifier backwash pump, the water in the recycling pool (4) is pumped out by the centrifugal clarifier backwash pump (5), enters the backwash channel through the centrifugal clarifier backwash pump electric water inlet valve (6), and flushes the centrifugal clarifier (7) through the nozzle (14). The flushed water is discharged to the outside through the electric sewage valve (15) of the centrifugal clarifier. After the electric water inlet valve (6) of the centrifugal clarifier backwash pump is kept open for a certain period of time, the electric water inlet valve (6) of the centrifugal clarifier backwash pump is closed, and then the centrifugal clarifier backwash pump (5) is closed, and then the electric sewage valve (15) of the centrifugal clarifier is closed. The electric water inlet valve (8) of the centrifugal clarifier is opened, and then the electric water outlet valve (10) of the centrifugal clarifier is opened. Then the coal-water lifting pump is opened, and the electronic flocculator (9) continues to operate. At this time, the turbidity at the outlet of the intermediate water pool is obtained. If the turbidity is less than or equal to the threshold value, the backwash is terminated. Otherwise, the process returns to S2.

10. A computer-readable storage medium having a program stored thereon, characterized in that: When the program is executed, the method as claimed in claim 9 is implemented.

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