Full-automatic siphon drainage system for clean drainage of silt basin

Abstract

The utility model discloses a silt basin clean drainage full-automatic siphon drainage system, which comprises a first branch pipe, a siphon, a liquid drainage pump, a check valve, an electric valve, a liquid level monitor and a controller, the liquid drainage pump and the check valve are both arranged on the first branch pipe, the check valve is arranged at the rear end of the liquid drainage pump, the electric valve is arranged on a siphon input pipe section, and the liquid level monitor is arranged on the siphon input pipe section. The pipe section from the inlet end to the highest point of the siphon pipe is a siphon input pipe section, the pipe section from the highest point to the outlet end of the siphon pipe is a siphon output pipe section, the first branch pipe is connected with the siphon input pipe section in parallel, and the inlet ends of the first branch pipe and the siphon input pipe section are both located in the sludge settling tank and arranged close to the bottom of the tank; an outlet of the first branch pipe is connected with a siphon at the rear end of the electric valve and is arranged close to the highest point, the outlet end of the siphon output pipe section is located in the water receiving pool and below the liquid level, the liquid level monitor is used for monitoring the liquid level of the sludge settling pool, and the liquid drainage pump, the electric valve and the liquid level monitor are connected with the controller. The system can automatically establish siphoning for unpowered liquid drainage, and energy consumption is greatly reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of liquid drainage equipment, and particularly relates to a full-automatic siphon drainage system for clarified sewage in a sedimentation tank. Background Art

[0002] In the circulating water sewage discharge system commonly used in waste incineration power plants, the sewage in the cooling tower collecting tank is discharged to the sedimentation tank, and the clarified sewage in the sedimentation tank is transported to the downstream sewage treatment plant through a drainage pump arranged in the tank via a pipeline. The operator starts the drainage pump to drain water every day, manually stops the drainage pump after the drainage is completed, and the sewage discharge flow from the cooling tower collecting tank to the sedimentation tank needs to be adjusted to be similar to the flow rate of the drainage pump to maintain the liquid level in the sedimentation tank from being too high or too low, ensuring that the water quality test of the clarified sewage meets the standard. The adjustment skills are relatively high and the operation is relatively frequent, with a large amount of operation. There are risks such as overflow of the sedimentation tank being full of water or damage to the drainage pump when the liquid level in the sedimentation tank reaches zero and the water quality not meeting the standard. And to ensure a certain amount of sewage discharge every day, the operation amount is large and the drainage pump starts and stops frequently, resulting in a large amount of maintenance work. The drainage pump consumes electric energy during operation, increasing the operation cost. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a full-automatic siphon drainage system for clarified sewage in a sedimentation tank with a simple structure and low power consumption in view of the deficiencies of the prior art.

[0004] To solve the above technical problem, the technical solution adopted by the utility model is as follows:

[0005] A full-automatic siphon drainage system for clarified sewage in a sedimentation tank includes a first branch pipe, a siphon pipe, a drainage pump, a check valve, an electric valve, a liquid level monitor and a controller. The drainage pump and the check valve are both located on the first branch pipe, and the check valve is located at the rear end of the drainage pump. The siphon pipe is a bent pipe including an inlet end, an outlet end and a highest point. The pipe section from the inlet end to the highest point is a siphon input pipe section, and the pipe section from the highest point to the outlet end is a siphon output pipe section. The electric valve is located on the siphon input pipe section. The first branch pipe is in parallel with the siphon input pipe section. The inlet ends of the first branch pipe and the siphon input pipe section are both located in the sedimentation tank and are arranged close to the bottom of the tank. The outlet of the first branch pipe is connected to the siphon pipe behind the electric valve and is arranged close to the highest point. The outlet end of the siphon output pipe section is located in the receiving tank of the downstream sewage treatment plant and is below the liquid level. The liquid level monitor is used to monitor the liquid level of the sedimentation tank. The drainage pump, the electric valve and the liquid level monitor are respectively connected to the controller, so as to realize that when the liquid level of the sedimentation tank reaches a first preset liquid level, the electric valve is closed and the drainage pump is started, and when the liquid level drops to a second preset liquid level, the drainage pump is stopped and the electric valve is opened.

[0006] For the above-mentioned fully automatic siphon drainage system for clarified sewage in the sedimentation tank, in a further improvement, it further includes a second branch pipe. The second branch pipe is connected in parallel with the siphon input pipe section. The inlet of the second branch pipe is located in the sedimentation tank and is arranged close to the bottom of the tank. The outlet of the second branch pipe is connected to the siphon pipe behind the electric valve and is arranged close to the highest point. A liquid discharge pump and a check valve are provided on the second branch pipe. The check valve is located behind the liquid discharge pump. The liquid discharge pump is connected to the controller.

[0007] For the above-mentioned fully automatic siphon drainage system for clarified sewage in the sedimentation tank, in a further improvement, the electric valve is located on the siphon input pipe section close to the highest point.

[0008] For the above-mentioned fully automatic siphon drainage system for clarified sewage in the sedimentation tank, in a further improvement, it further includes a liquid level alarm. The liquid level alarm is connected to the controller.

[0009] For the above-mentioned fully automatic siphon drainage system for clarified sewage in the sedimentation tank, in a further improvement, the liquid level alarm uses light or sound as an alarm signal.

[0010] For the above-mentioned fully automatic siphon drainage system for clarified sewage in the sedimentation tank, in a further improvement, a stop valve is further provided on the siphon pipe. The stop valve is located behind the electric valve.

[0011] For the above-mentioned fully automatic siphon drainage system for clarified sewage in the sedimentation tank, in a further improvement, a first stop valve is further provided on the first branch pipe. The first stop valve is located behind the check valve.

[0012] For the above-mentioned fully automatic siphon drainage system for clarified sewage in the sedimentation tank, in a further improvement, a second stop valve is further provided on the second branch pipe. The second stop valve is located behind the check valve.

[0013] Compared with the prior art, the advantages of the present utility model are as follows:

[0014] (1) For the fully automatic siphon drainage system for clarified sewage in the sedimentation tank of the present utility model, by setting a first branch pipe connected in parallel with the siphon input pipe section, and arranging a liquid discharge pump and a check valve on this branch pipe, an electric valve is arranged on the siphon input pipe section, and a liquid level monitor is arranged in the sedimentation tank. The liquid discharge pump, the electric valve and the liquid level monitor are connected to the controller, so as to realize that when the liquid level in the sedimentation tank reaches the first preset liquid level, the electric valve is closed and the liquid discharge pump is started, and when the liquid level drops to the second preset liquid level, the liquid discharge pump is stopped and the electric valve is opened, thereby automatically establishing a siphon and realizing non-powered liquid discharge. Except for injecting water to establish a siphon, the liquid discharge pump does not need to be started at other times, which can greatly save power consumption, does not require manual operation, and minimizes the economic cost of liquid discharge to the greatest extent.

[0015] (2) The fully automatic siphon drainage system for the clarified wastewater in the sedimentation tank of the present utility model can exhibit more significant advantages in scenarios where the sedimentation tank is continuously injected with liquid from upstream. When in use, the flow rate of the upstream liquid injected into the sedimentation tank is set to be less than the drainage flow rate of the siphon. Thus, when the liquid level in the sedimentation tank rises to the first preset liquid level, the siphon drainage is automatically established through this device. When the liquid level in the sedimentation tank gradually drops to the entrance of the siphon pipe, the siphon is broken and the device automatically stops draining. With the continuous injection of the upstream liquid, the liquid level in the sedimentation tank gradually rises, and when it rises to the first preset liquid level, a new round of automatic drainage is achieved. The entire process of establishing and breaking the siphon drainage does not require any manual operation, that is, the fully automatic siphon drainage function is realized.

[0016] (3) The system of the present utility model cleverly utilizes the height difference between the sedimentation tank and the receiving tank of the terminal sewage treatment plant, and sets a siphon pipe, a branch pipe for establishing a siphon, a drainage pump, an electric valve, and a check valve based on the siphon principle. On this basis, a controller is added, which greatly reduces the complexity of the drainage operation and reduces the safety risk. The siphon is established by automatically controlling the drainage pump to fully fill the entire pipeline with water. In this drainage method, the cooling tower sewage is drained to the sedimentation tank to maintain a certain small flow rate of continuous drainage. The siphon flow rate is greater than the cooling tower sewage flow rate, and the siphon is automatically broken when the liquid level drops. Except for filling water to establish the siphon, the drainage pump does not need to be started at other times, which maximally reduces the economic cost of drainage. The present utility model realizes simple, efficient, safe, and economic siphon drainage of the clarified wastewater in the sedimentation tank by making full use of the existing geographical location advantages. The fully automatic drainage does not require manual operation, which not only greatly simplifies the operation but also is safe and stable. The system has a simple structure and low transformation cost, and has a significant effect of reducing costs and increasing efficiency. Brief Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of the fully automatic siphon drainage system for the clarified wastewater in the sedimentation tank in a specific embodiment of the present utility model.

[0018] Figure 2 The main working flow chart of the fully automatic siphon drainage system for the clarified wastewater in the sedimentation tank in a specific embodiment of the present utility model. Legend: 1. First branch pipe; 2. Siphon pipe; 3. Drainage pump; 4. Check valve; 5. Electric valve; 6. Second branch pipe; 7. Globe valve; 8. First stop valve; 9. Second stop valve. Detailed Embodiments

[0019] The following further describes the present utility model in conjunction with the drawings of the specification and specific preferred embodiments, but does not limit the protection scope of the present utility model thereby.

[0020] Waste incineration power plants are generally located in suburbs or mountainous areas, with certain geographical location advantages. There is a certain height difference between the sedimentation tank and the downstream sewage treatment plant. In this embodiment, the drainage of the clean wastewater in the sedimentation tank of the waste incineration power plant is used as the application scenario. In the waste incineration power plant, the cooling tower sump discharges sewage into the sedimentation tank. After the sewage deposits sludge in the sedimentation tank, clean wastewater is obtained. The clean wastewater in the sedimentation tank is discharged into the receiving tank located in the downstream sewage treatment plant through the system of this embodiment.

[0021] As Figure 1 shown, the full-automatic siphon drainage system for the clean wastewater in the sedimentation tank of this embodiment includes a first branch pipe 1, a siphon pipe 2, a liquid discharge pump 3, a check valve 4, an electric valve 5, a liquid level monitor and a controller. The liquid discharge pump 3 and the check valve 4 are both located on the first branch pipe 1. The check valve 4 is located at the rear end of the liquid discharge pump 3. The siphon pipe 2 is a bent pipe including an inlet end, an outlet end and a highest point. The pipe section from the inlet end to the highest point is the siphon input pipe section, and the pipe section from the highest point to the outlet end is the siphon output pipe section. The electric valve 5 is located on the siphon input pipe section. The first branch pipe 1 is connected in parallel with the siphon input pipe section. The inlet end of the first branch pipe 1 and the inlet end of the siphon input pipe section are both located in the sedimentation tank and are arranged close to the bottom of the tank. The outlet of the first branch pipe 1 is connected to the siphon pipe 2 behind the electric valve 5 and is arranged close to the highest point. The outlet end of the siphon output pipe section is located in the receiving tank of the downstream sewage treatment plant and is below the liquid level. The liquid level monitor is used to monitor the liquid level of the sedimentation tank. The liquid discharge pump 3, the electric valve 5 and the liquid level monitor are respectively connected to the controller, so as to realize that when the liquid level of the sedimentation tank reaches the first preset liquid level, the electric valve 5 is closed and the liquid discharge pump 3 is started, and when the liquid level drops to the second preset liquid level, the liquid discharge pump 3 is stopped and the electric valve 5 is opened.

[0022] In this embodiment, by setting the first branch pipe 1 connected in parallel with the siphon input pipe section, and arranging the liquid discharge pump 3 and the check valve 4 on this branch pipe, setting the electric valve 5 on the siphon input pipe section, setting the liquid level monitor in the sedimentation tank, connecting the liquid discharge pump 3, the electric valve 5 and the liquid level monitor to the controller, and the controller controls the actions of the liquid discharge pump 3 and the electric valve 5 according to the liquid level information fed back by the liquid level monitor. When the liquid level rises to the first preset liquid level, the controller closes the electric valve 5 and starts the liquid discharge pump 3 at the same time. Under the action of the liquid discharge pump 3, the liquid quickly fills the first branch pipe 1 and the siphon pipe 2 behind the electric valve 5. Under the action of the atmospheric pressure, the siphon pipe 2 in front of the electric valve 5 is already filled with liquid. At this time, the liquid discharge pump 3 is closed and the electric valve 5 is opened to establish siphon and start automatic drainage. For the convenience of control, the researchers of this application determined through multiple tests and observations the liquid level of the sedimentation tank corresponding to the liquid level monitor when both the first branch pipe 1 and the siphon pipe 2 are filled with liquid, and used this as the second preset liquid level. When the second preset liquid level is reached, the controller closes the liquid discharge pump 3 and opens the electric valve 5, thereby realizing the full-automatic siphon drainage of this system. The control logic involved in this process is simple, and the controller can be implemented by a PLC.

[0023] The fully automatic siphon drainage system for cleaning the silt tank of this embodiment is particularly suitable for the situation where water from the water collection tank is continuously injected into the silt tank, and the flow rate of the water collection tank injected into the silt tank is less than the flow rate of the siphon drainage. Therefore, when the liquid level of the silt tank rises to the first preset liquid level, the siphon drainage is automatically established through the device of this embodiment. When the liquid level of the silt tank gradually drops to the entrance of the siphon pipe 2, the siphon is destroyed, and the system of this embodiment automatically stops draining. As the sewage from the water collection tank is continuously injected, the liquid level of the silt tank gradually rises, and a new round of automatic drainage is realized when it rises to the first preset liquid level. The fully automatic siphon drainage system for cleaning the silt tank of this embodiment can effectively reduce the power consumption of drainage of the silt tank and the downstream sewage treatment plant water receiving tank, avoid manual operation, and save manpower.

[0024] It should be noted that the height of the highest point of the siphon tube 2 from the liquid level of the sludge tank should not be higher than the height of the water column that the atmospheric pressure can support, that is, one atmospheric pressure supports a water column of approximately 10.34 meters. However, in actual applications, due to the influence of factors such as the pressure and temperature in the pipe, the pressure value of the siphon tube 2 is generally not greater than 7 meters to 8 meters of water column height to avoid liquid vaporization destroying the continuity of the water flow. It should also be noted that the water outlet position of the siphon tube 2 must be lower than the liquid level of the water receiving tank.

[0025] Working process as Figure 2 As shown, the water level monitor monitors the water level in the sedimentation tank in real time and transmits the acquired water level information to the controller. When the water level reaches the first preset liquid level h1, the controller controls the drainage pump 3 to start and the electric valve 5 to close. The water in the sedimentation tank will fill the first branch pipe 1 and the siphon pipe 2 at the rear end of the electric valve 5 in turn. Under the action of atmospheric pressure, the siphon pipe 2 at the front end of the electric valve 5 is also full of water. At this time, the water level of the corresponding sedimentation tank drops to the second preset liquid level h2. The controller controls the drainage pump 3 to close and the electric valve 5 to open, and the siphon can be established to start automatic drainage. The sewage discharge from the water collection tank of the cooling tower to the sedimentation tank is set to 24 hours of uninterrupted small flow discharge. The flow of the siphon pipe 2 is greater than the sewage discharge flow of the water collection tank. As the siphon drainage proceeds, the liquid level of the sedimentation tank begins to drop. When the liquid level drops to the inlet of the siphon pipe 2 (about 0.2m away from the bottom of the sedimentation tank), the siphon is automatically destroyed and the drainage ends. The sewage discharge from the water collection tank to the siltation tank is still continuing, and the liquid level in the siltation tank will gradually rise again until the first preset liquid level is reached, and the next round of siphon drainage is automatically established to achieve closed-loop circulation control. In this embodiment, no human operation is required during the establishment and destruction of the entire siphon drainage, that is, a fully automatic siphon drainage function is achieved. More importantly, except for water injection to establish the siphon, the drainage pump 3 does not need to be started at other times, which can minimize the economic cost of drainage.

[0026] Further improved, the system of this embodiment further includes a liquid level alarm, such as a light alarm or a sound alarm. The liquid level alarm is connected to the controller and is used to emit an alarm signal when the liquid level reaches the first preset liquid level. Specifically, in this embodiment, a DCS light board is used for high liquid level alarm. When the liquid level of the sedimentation tank reaches the first preset liquid level, the DCS light board emits light for alarm, which can effectively remind the monitoring personnel to monitor the normal establishment of the siphon, so that the sedimentation tank will not overflow due to failure, and the reliability is high.

[0027] Further improved, in this embodiment, there is also a second branch pipe 6. The second branch pipe 6 is connected in parallel with the siphon input pipe section. The inlet of the second branch pipe 6 is located in the sedimentation tank and is arranged close to the bottom of the tank. The outlet of the second branch pipe 6 is connected to the siphon pipe 2 behind the electric valve 5 and is arranged close to the highest point. A drain pump 3 and a check valve 4 are provided on the second branch pipe 6. The check valve 4 is located behind the drain pump 3, and the drain pump 3 is connected to the controller. By setting the second branch pipe 6 and the drain pump 3 and the check valve 4 thereon as the standby pipeline of the first branch pipe 1, when the first branch pipe 1 fails, the second branch pipe 6 can be switched to be put into use at any time, so that maintenance can be carried out without affecting normal drainage, ensuring the long-term stable operation of the system.

[0028] Further improved, in this embodiment, a stop valve 7 is also provided on the siphon pipe 2. The stop valve 7 is located behind the electric valve 5, which is convenient for isolation and maintenance in case of failure.

[0029] Further improved, in this embodiment, a first stop valve 8 is also provided on the first branch pipe 1. The first stop valve 8 is located behind the check valve 4. By setting the first stop valve 8 on the first branch pipe 1, it is convenient to close the first branch pipe 1 through the first stop valve 8 for troubleshooting when the pipeline needs to be switched, without affecting the normal operation of the whole system. When there is no drainage, the first stop valve 8 and the stop valve on the siphon pipe 2 are kept open, and the electric valve 5 on the siphon pipe 2 is closed.

[0030] Further improved, in this embodiment, a second stop valve 9 is also provided on the second branch pipe 6. The second stop valve 9 is located behind the check valve 4. By setting the second stop valve 9 on the second branch pipe 6, it is convenient to close the second branch pipe 6 through the second stop valve 9 for troubleshooting when the pipeline needs to be switched, without affecting the normal operation of the whole system.

[0031] By transforming the pipeline of the existing drainage system, the utility model makes full use of the height difference between the drainage point and the terminal position, and realizes fully automatic siphon drainage through reasonable automatic logic control.

[0032] Although the present utility model is disclosed above with preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make many possible changes and modifications to the technical solution of the present utility model by using the methods and technical contents disclosed above, or modify it into equivalent embodiments with equivalent changes, without departing from the spirit and technical solution of the present utility model. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model still fall within the scope of protection of the technical solution of the present utility model.

Claims

1. An automatic siphon drainage system for clarified sewage in a sedimentation tank, characterized in that It includes a first branch pipe (1), a siphon pipe (2), a drain pump (3), a check valve (4), an electric valve (5), a liquid level monitor and a controller. The drain pump (3) and the check valve (4) are both located on the first branch pipe (1). The check valve (4) is located at the rear end of the drain pump (3). The siphon pipe (2) is a bent pipe including an inlet end, an outlet end and a highest point. The pipe section from the inlet end to the highest point is the siphon input pipe section, and the pipe section from the highest point to the outlet end is the siphon output pipe section. The electric valve (5) is located on the siphon input pipe section. The first branch pipe (1) is in parallel with the siphon input pipe section. The inlet ends of the first branch pipe (1) and the siphon input pipe section are both located in the sedimentation tank and are arranged close to the bottom of the tank. The outlet of the first branch pipe (1) is connected to the siphon pipe (2) behind the electric valve (5) and is arranged close to the highest point. The outlet end of the siphon output pipe section is located in the receiving tank of the downstream sewage treatment plant and is below the liquid level. The liquid level monitor is used to monitor the liquid level of the sedimentation tank. The drain pump (3), the electric valve (5) and the liquid level monitor are respectively connected to the controller.

2. The fully automatic siphon drainage system for clean sewage in the sedimentation tank according to claim 1, wherein, It further includes a second branch pipe (6). The second branch pipe (6) is in parallel with the siphon input pipe section. The inlet of the second branch pipe (6) is located in the sedimentation tank and is arranged close to the bottom of the tank. The outlet of the second branch pipe (6) is connected to the siphon pipe (2) behind the electric valve (5) and is arranged close to the highest point. The second branch pipe (6) is provided with a drain pump (3) and a check valve (4). The check valve (4) is located at the rear end of the drain pump (3). The drain pump (3) is connected to the controller.

3. The fully automatic siphon drainage system for clarified sewage in the sedimentation tank according to claim 2, characterized in that, It further includes a liquid level alarm, and the liquid level alarm is connected to the controller.

4. The fully automatic siphon drainage system for clarified wastewater in the sedimentation tank according to claim 3, wherein, The liquid level alarm uses light or sound as an alarm signal.

5. The fully automatic siphon drainage system for clean wastewater in the sedimentation tank according to any one of claims 1 to 4, characterized in that, A stop valve (7) is further provided on the siphon pipe (2), and the stop valve (7) is located behind the electric valve (5).

6. The fully automatic siphon drainage system for clean sewage in the sedimentation tank according to any one of claims 1 to 4, characterized in that, A first stop valve (8) is further provided on the first branch pipe (1), and the first stop valve (8) is located behind the check valve (4).

7. The fully automatic siphon drainage system for clarified wastewater in the sedimentation tank according to any one of claims 2 to 4, characterized in that, A second stop valve (9) is further provided on the second branch pipe (6), and the second stop valve (9) is located behind the check valve (4).

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