An electromagnetic pulse cleaning system and method for underground pipelines

Abstract

This invention discloses an electromagnetic pulse cleaning system and method for buried pipelines. The system includes a buried pipeline, a first electromagnetic pulse cleaner, and a second electromagnetic pulse cleaner. The first electromagnetic pulse cleaner is installed at one end of the buried pipeline, and the second electromagnetic pulse cleaner is installed at the other end. The first and second electromagnetic pulse cleaners alternately start with a delay time of T. By changing the value of the delay time T, the electromagnetic pulses generated by the first and second electromagnetic pulse cleaners collide and clean at different locations on the buried pipeline. This solves the cleaning problem of long circulating water pipelines buried deep underground, and has the beneficial effects of high cleaning safety and efficiency.

Description

Technical Field

[0001] This invention belongs to the field of pipeline cleaning technology, specifically relating to an electromagnetic pulse cleaning system and method for buried pipelines. Background Technology

[0002] When a seawater open cooling system is used in the power plant's circulating water, the seawater enters the pipes when the circulating pump starts, causing barnacles, sea snails, and other shellfish to grow on the pipe walls. After they grow, they absorb the silt or debris from the seawater and accumulate in the pipes, causing the inner diameter of the pipes to become smaller and smaller, affecting the speed and flow rate of the water.

[0003] In addition, because the cleaning pipes provided are buried underground and the inlet pipes are quite long, marine organisms accumulate inside the pipes for a long time, generating a lot of harmful gases, making manual cleaning highly dangerous.

[0004] The inlet water flow rate is 3000 t / h, while the design value is 6000 t / h. The actual flow rate is only 50% of the design value, which not only reduces the cooling efficiency of the supplied units and increases the heat consumption of the units, but also seriously affects the unit speed and load. Especially during the winter and spring seasons when both units operate in circulation mode, the flow rate of the circulating water pump is even lower, and the deposition of marine organisms and scaling are more serious. Under special operating conditions, additional circulating pumps need to be operated, increasing the plant's power consumption. Therefore, improving and maintaining the unobstructed and cleanliness of the unit's inlet and outlet water pipelines is very important for the safe and economical operation of the units. Summary of the Invention

[0005] In view of this, the present invention provides an electromagnetic pulse cleaning system and method for underground pipelines.

[0006] The specific plan is as follows:

[0007] An electromagnetic pulse cleaning system for underground pipelines includes an underground pipeline, a first electromagnetic pulse cleaner, and a second electromagnetic pulse cleaner. Expansion joints are installed at both ends of the underground pipeline, and each expansion joint has a drain port and a water inlet port. The first electromagnetic pulse cleaner is connected to one end of the underground pipeline via the water inlet port, and the second electromagnetic pulse cleaner is connected to the other end of the underground pipeline via the water inlet port. Both the first and second electromagnetic pulse cleaners are also connected to a host computer, which controls the start-up time of the first and second electromagnetic pulse cleaners.

[0008] The sewage discharge port is connected to an exhaust pipe, a sewage pump, and a debris collection tank. The debris collection tank is connected to the sewage discharge port via a valve. During the pipe cleaning process, the valve on the debris collection tank is opened, the sewage pump is not started, and the debris collection tank collects the debris during cleaning. After the pipe cleaning is completed, the sewage pump is started to discharge the sewage from the buried pipe.

[0009] A method for electromagnetic pulse cleaning of ground pipelines includes the following steps:

[0010] S1): A first electromagnetic pulse cleaner is installed at one end of the buried pipeline, and a second electromagnetic pulse cleaner is installed at the other end of the buried pipeline. The first electromagnetic pulse cleaner and the second electromagnetic pulse cleaner are the same model of electromagnetic pulse cleaner.

[0011] S2): The first electromagnetic pulse cleaner and the second electromagnetic pulse cleaner alternately start with a delay. The delay time is T. By changing the value of the delay time T, the electromagnetic pulses generated by the first electromagnetic pulse cleaner and the electromagnetic pulses generated by the second electromagnetic pulse cleaner collide and clean at different locations of the buried pipeline.

[0012] The delayed start time T satisfies 0≤T≤S / V, where S is the length of the buried pipeline and V is the propagation speed of the electromagnetic pulse in the pipeline.

[0013] Both the first and second electromagnetic pulse cleaners are connected to dosing tanks via pipelines. Before cleaning buried pipelines, the following steps are also included.

[0014] P1): Calculate the total capacity of the underground pipeline;

[0015] P2): The first electromagnetic pulse cleaner injects chemical solution into the buried pipeline through the chemical dosing tank or the second electromagnetic pulse cleaner injects chemical solution through the chemical dosing tank. The amount of chemical solution injected is 1 / 4 of the total capacity of the buried pipeline. At the same time, both the first and second electromagnetic pulse cleaners perform vapor-liquid mixing.

[0016] This invention discloses an electromagnetic pulse cleaning system and method for buried pipelines. A first electromagnetic pulse cleaner and a second electromagnetic pulse cleaner are installed at both ends of the buried pipeline. The first and second electromagnetic pulse cleaners are alternately started with a delay, so that the electromagnetic pulses generated by the first and second electromagnetic pulse cleaners collide and clean at different locations in the circulating water pipe of the unit. This solves the cleaning problem of long circulating water pipelines buried deep underground and has the beneficial effects of high cleaning safety and efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram illustrating the principle of alternating delayed cleaning of pipelines.

[0018] Figure 2 This is a schematic diagram of the alternating delayed cleaning pipeline.

[0019] Figure 3 This is a schematic diagram of the expansion joint inside the pipeline. Detailed Implementation

[0020] The technical solutions in the embodiments of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the implementation of the present invention, and not all of it. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0021] like Figure 1 As shown, the electromagnetic pulse cleaning method for buried pipelines includes the following steps:

[0022] S1): Install a first electromagnetic pulse cleaner 2 at one end of the underground pipeline 1 and a second electromagnetic pulse cleaner 3 at the other end of the underground pipeline. The first electromagnetic pulse cleaner 2 and the second electromagnetic pulse cleaner 3 are electromagnetic pulse cleaners of the same model.

[0023] S2): The first electromagnetic pulse cleaner 2 and the second electromagnetic pulse cleaner 3 alternately start with a delay. The delay time is T. By changing the value of the delay time T, the electromagnetic pulses generated by the first electromagnetic pulse cleaner 2 and the electromagnetic pulses generated by the second electromagnetic pulse cleaner 3 collide and clean at different locations of the buried pipeline 1.

[0024] The delayed start time T satisfies 0≤T≤S / V, where S is the length of the buried pipeline 1 and V is the propagation speed of the electromagnetic pulse in the pipeline.

[0025] like Figure 1 As shown, in this embodiment, pulse collision cleaning is preferably performed at both ends of the buried pipeline, at 1 / 4 of the total pipeline length, at 1 / 2 of the total pipeline length, and at 3 / 4 of the total pipeline length.

[0026] Specifically,

[0027] like Figure 1 As shown in (a), when the delayed start time T=0, the first electromagnetic pulse cleaner 2 and the second electromagnetic pulse cleaner 3 will start simultaneously. After starting, the electromagnetic pulses will collide at 1 / 2 of the total length of the tube and perform cleaning.

[0028] like Figure 1 As shown in (b), when the delay start time T=S / 2V, the first electromagnetic pulse cleaner 2 starts first, and the second electromagnetic pulse cleaner 3 starts after the delay time S / 2V. At this time, the electromagnetic pulse generated by the first electromagnetic pulse cleaner 2 and the electromagnetic pulse generated by the second electromagnetic pulse cleaner 3 will cause pulse collision cleaning at 3 / 4 of the underground pipeline 1.

[0029] like Figure 1As shown in (c), when the delay start time T=S / 2V, the second electromagnetic pulse cleaner 3 starts first, and the first electromagnetic pulse cleaner 2 starts after the delay time S / 2V. At this time, the electromagnetic pulse generated by the first electromagnetic pulse cleaner 2 and the electromagnetic pulse generated by the second electromagnetic pulse cleaner 3 will collide and clean at 1 / 4 of the underground pipeline 1.

[0030] When the delay start time T=S / V, the first electromagnetic pulse cleaner 2 starts first, and the second electromagnetic pulse cleaner 3 starts after the delay time S / V. At this time, the electromagnetic pulses generated by the first electromagnetic pulse cleaner 2 and the electromagnetic pulses generated by the second electromagnetic pulse cleaner 3 will collide and clean at one end of the buried pipe 1.

[0031] When the delay start time T=S / V, the second electromagnetic pulse cleaner 3 starts first, and the first electromagnetic pulse cleaner 2 starts after the delay time S / V. At this time, the electromagnetic pulse generated by the first electromagnetic pulse cleaner 2 and the electromagnetic pulse generated by the second electromagnetic pulse cleaner 3 will cause pulse collision cleaning at the other end of the buried pipeline 1.

[0032] In this embodiment, by changing the value of the delayed start time T, the electromagnetic pulses generated by the first electromagnetic pulse cleaner 2 and the electromagnetic pulses generated by the second electromagnetic pulse cleaner 3 collide and clean at different locations in the buried pipeline 1, thus achieving efficient cleaning.

[0033] like Figure 2 As shown, both the first electromagnetic pulse cleaner 2 and the second electromagnetic pulse cleaner 3 are connected to a dosing tank 5 via pipelines. Before cleaning the buried pipeline 1, the following steps are also included.

[0034] P1): Calculate the total capacity of underground pipeline 1;

[0035] P2): The first electromagnetic pulse cleaner 2 adds chemical solution to the buried pipeline through the chemical dosing tank 5 or the second electromagnetic pulse cleaner 3 adds chemical solution through the chemical dosing tank 5. The amount of chemical solution added is 1 / 4 of the total capacity of the buried pipeline 1. At the same time, both the first electromagnetic pulse cleaner 2 and the second electromagnetic pulse cleaner 3 perform vapor-liquid mixing. In order to ensure the cleaning effect, the chemical solution is added intermittently during the cleaning process to facilitate the raising and maintenance of the temperature of the circulating chemical solution. Heaters are installed on the chemical dosing tank 5 and the water inlet pipe.

[0036] Both the first electromagnetic pulse cleaner 2 and the second electromagnetic pulse cleaner 3 are connected to an industrial water supply pipe 8, which replenishes water to both machines. The industrial water supply pipe 8 also supplies water to the dosing tank 5. Furthermore, in this embodiment, both the first electromagnetic pulse cleaner 2 and the second electromagnetic pulse cleaner 3 are replenished with steam through a steam supply pipe 9, and the compressed air inlet is connected to a power plant compressed air interface to achieve the air-water pulse cleaning function.

[0037] like Figure 2 and Figure 3 As shown, expansion joints 4 are installed at both ends of the underground pipeline 1. The expansion joints 4 are provided with a sewage outlet 18 and a water inlet 11. The first electromagnetic pulse cleaner 2 is connected to one end of the underground pipeline 1 through the water inlet 11, and the second electromagnetic pulse cleaner 3 is connected to the other end of the underground pipeline 1 through the water inlet 11.

[0038] The sewage discharge port 18 is connected to a steam exhaust pipe 12, a sewage pump 6, and a debris collection tank 13. The debris collection tank 13 is connected to the sewage discharge port 18 via a valve. During the pipe cleaning process, the valve on the debris collection tank 13 is opened, the sewage pump 6 is not started, and the debris collection tank 13 collects debris during cleaning. After the pipe cleaning is completed, the sewage pump 6 is started to discharge the sewage from the buried pipe 1. The sewage pump 6 is connected to the sewage discharge port 10 via a sewage discharge pipe 10, and the steam exhaust pipe 12 is used for steam exhaust. After cleaning, the sewage pump is started to discharge the waste liquid. To discharge the waste liquid in the pipe, the electromagnetic pulse cleaner on the opposite port applies a pulse at intervals during the discharge process.

[0039] The sewage discharged by the sewage pump will flow into the designated chemical neutralization tank for neutralization; an exhaust valve is installed on the exhaust pipe 12, which is connected to the dosing tank or to the ventilation area of ​​the plant or the sewage tank.

[0040] In this embodiment, the underground pipe 1 is 750mm away from the center of the main circulating pipe at the connection point of the circulating water main pipe, and the end of the pipe leading out is 4.8m away from the ground. The circulating water pipe of the small turbine condenser is about 280 meters long and has a diameter of D1120.

[0041] The buried pipeline 1 has a manhole and various shut-off valves at one end. The manhole is a passage for people to enter the pipeline, and an expansion joint 4 can be installed at the end of the circulating water pipeline through the manhole. At the same time, the two ends of the circulating pipeline leading to the main unit serve as cleaning water inlets, as well as cleaning wastewater outlets and vents. The cleaning pipeline, wastewater discharge pipeline, vent pipeline, and various instrument connections are all brought to the ground. The cleaning device is placed near the entrance to the machine room, forming an automated circulating cleaning system.

[0042] like Figures 2 to 3As shown, expansion joints 4 are installed at both ends of the underground pipeline 1, and the first electromagnetic pulse cleaner 2 and the second electromagnetic pulse cleaner 3 are connected to the underground pipeline 1 through the expansion joints 4.

[0043] like Figure 3 As shown, the expansion joint 4 is connected to the end away from the buried pipeline 1 via the support cylinder 16 and the positioning cover 15, and the positioning cover 15 is fixedly connected to the top clamping rod 14; the end of the expansion joint 4 near the buried pipeline 1 is fixedly equipped with a baffle 17, and the expansion joint 4 is fixedly connected to the baffle 17.

[0044] Electromagnetic pulse cleaners use gas-liquid mixing and an automatic control system to generate pulse waves. These waves expand rapidly upon entering the pipe, instantly producing high-speed water flow and turbulent oscillations. Combined with chemical solutions, these waves wash the pipe walls, causing attached and detached dirt to gradually fall off and dissolve in the liquid. As the pulsed circulation continues, the chemical solution is discharged, achieving a cleaning effect.

[0045] The first electromagnetic pulse cleaner 2 and the second electromagnetic pulse cleaner 3 are both connected to a host computer, which controls the start-up time of the first and second electromagnetic pulse cleaners. Both the first and second electromagnetic pulse cleaners 2 and 3 are equipped with serial ports, and both communicate with the host computer (a PC) via these serial ports.

[0046] In this embodiment, "first" and "second" do not represent a specific order, but are merely for ease of description and distinction.

[0047] The specific working process of the electromagnetic pulse cleaning method for underground pipelines is as follows: before conveying the cleaning solution into the underground pipeline 1, a special pipeline cleaning agent is first put into the pipeline through the sewage pipe interface at both ends of the pipeline. Then, the total capacity of the pipeline is calculated. The electromagnetic pulse cleaner conveys 1 / 4 of the total capacity of the pipeline through the dosing tank 5. During the conveying of the cleaning solution, the electromagnetic pulse cleaner performs gas-liquid mixing.

[0048] Electromagnetic pulse cleaners installed at both ends of the buried pipeline 1 operate alternately with a delay, causing the electromagnetic pulses to collide and clean at different locations within the buried pipeline 1. The electromagnetic pulse cleaners generate pulse waves that rapidly expand upon entering the pipeline, instantly producing high-speed water flow and turbulent oscillations. The pulse collision cleaning action generated by the two cleaners causes the attached and peeled dirt to gradually detach and dissolve in the liquid, thus achieving a cleaning effect.

[0049] The aforementioned electromagnetic pulse cleaning system and method for buried pipelines have the following advantages:

[0050] 1) The cleaning process is safe and reliable. The electromagnetic pulse pressure is generally between 0.3-0.5 MPa. The pulse frequency and pulse intensity are automatically adjustable according to the pressure difference setting of the circulation pipeline, ensuring good safety.

[0051] 2) The cleaning method complies with national cleaning guidelines and standards. A compound cleaning agent and its proportions are formulated according to the scale sample, resulting in low corrosion of metals and sealing rings, minimal environmental impact, real-time acid value monitoring during the cleaning process, and proper discharge of cleaning wastewater.

[0052] 3) High cleaning efficiency. Electromagnetic pulse air-water mixed cleaning has a short cleaning time and can quickly remove deposits.

[0053] 4) Saves on cleaning agents. The physical effect of electromagnetic pulses can greatly reduce the amount of chemical agents used, thereby reducing the impact of neutralizing agents, metal corrosion, and the environment.

[0054] 5) Excellent production environment. Because it does not require disassembly and cleaning, has a high degree of system integration, operates in a fully enclosed manner, and features a highly corrosion-resistant and safe design, there are no leaks or spills on site.

[0055] The technical means disclosed in this invention are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this invention, and these improvements and modifications are also considered within the scope of protection of this invention.

Claims

1. An electromagnetic pulse cleaning system for buried pipelines, characterized in that: The system includes a buried pipeline, a first electromagnetic pulse cleaner and a second electromagnetic pulse cleaner. Both ends of the buried pipeline are equipped with expansion joints, and the expansion joints are provided with a sewage outlet and a water inlet. The first electromagnetic pulse cleaner is connected to one end of the buried pipeline through the water inlet, and the second electromagnetic pulse cleaner is connected to the other end of the buried pipeline through the water inlet. The first electromagnetic pulse cleaner and the second electromagnetic pulse cleaner are also connected to a host computer. The host computer controls the start time of the first electromagnetic pulse cleaner and the second electromagnetic pulse cleaner. By changing the value of the delayed start time T, the electromagnetic pulses generated by the first electromagnetic pulse cleaner (2) and the electromagnetic pulses generated by the second electromagnetic pulse cleaner (3) collide and clean at different locations of the buried pipeline (1). The sewage outlet is connected to an exhaust pipe, a sewage pump and a debris collection tank. The debris collection tank is connected to the sewage outlet via a valve. During the pipe cleaning process, the valve on the debris collection tank is opened and the sewage pump is not started. The debris collection tank collects debris during cleaning. After the pipe cleaning is completed, the sewage pump is started to discharge the sewage in the underground pipe. There is a manhole at the end of the underground pipe (1). An expansion joint (4) can be installed at the end of the circulating water pipe through the manhole.

2. A method for electromagnetic pulse cleaning of buried pipelines, characterized in that: Includes the following steps: S1): A first electromagnetic pulse cleaner is installed at one end of the buried pipeline, and a second electromagnetic pulse cleaner is installed at the other end of the buried pipeline. The first electromagnetic pulse cleaner and the second electromagnetic pulse cleaner are the same model of electromagnetic pulse cleaner. S2): The first electromagnetic pulse cleaner and the second electromagnetic pulse cleaner alternately start with a delay. The delay time is T. By changing the value of the delay time T, the electromagnetic pulses generated by the first electromagnetic pulse cleaner and the electromagnetic pulses generated by the second electromagnetic pulse cleaner collide and clean at different locations of the buried pipeline. The delayed start time T satisfies 0≤T≤S / V, where S is the length of the buried pipeline and V is the propagation speed of the electromagnetic pulse in the pipeline; Both the first and second electromagnetic pulse cleaners are connected to dosing tanks via pipelines. Before cleaning buried pipelines, the following steps are also included. P1): Calculate the total capacity of the underground pipeline; P2): The first electromagnetic pulse cleaner injects chemical solution into the buried pipeline through the chemical dosing tank or the second electromagnetic pulse cleaner injects chemical solution through the chemical dosing tank. The amount of chemical solution injected is 1 / 4 of the total capacity of the buried pipeline. At the same time, both the first and second electromagnetic pulse cleaners perform vapor-liquid mixing.

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