A power plant circulating cooling water dosing device

Abstract

This utility model relates to the field of thermal power plant technology, specifically to a circulating cooling water dosing device for thermal power plants. It includes a dosing tank with a vertical filter cylinder fixedly connected to the center of its inner top wall, the filter cylinder housing a filtration mechanism; a vertical pipe fixedly connected to the center of the inner bottom wall of the dosing tank, with a waste discharge mechanism between the vertical pipe and the filtration mechanism; and a water pump fixedly connected to the left side of the bottom of the dosing tank, with a circulation mechanism between the water pump and the dosing tank. This utility model, through the combined use of a filter screen and a lifting plate, achieves online filtration of the chemical solution, effectively intercepting particulate impurities and preventing clogging of the dosing system. It solves the problems of pump wear and decreased metering accuracy caused by impurities in the chemical solution in traditional devices.

Description

Technical Field

[0001] This utility model relates to the field of thermal power plant technology, specifically to a chemical dosing device for circulating cooling water in thermal power plants. Background Technology

[0002] Thermal power generating units typically use abundant surface water or seawater as their circulating cooling water source. However, due to differences in water quality, temperature variations, and the existence of dead zones in the system, these water sources are prone to the growth of microorganisms or the formation of biological slime. These microorganisms and slime not only cause pipe blockage and affect cooling efficiency but can also corrode equipment, further threatening the safe operation of the unit. To address these problems, thermal power generating units usually employ chemical dosing for prevention. By adding specific chemical agents to the circulating cooling water system, the growth of microorganisms is inhibited, and the formation of biological slime is reduced.

[0003] An integrated circulating cooling water dosing device for thermal power plants, disclosed in authorization announcement number CN221894178U, includes a base and a support. The lower end of the base is connected to casters. A dosing tank is mounted on the upper surface of the base, with a dosing tank inlet at the top and a dosing tank outlet on the side, the outlet connected to the dosing pump inlet. A flushing drain is located at the lower end of the base. The dosing pump outlet is connected to the circulating cooling water system. A liquid level column is connected to the side of the dosing tank, with both the top and bottom ends of the column communicating with the interior of the dosing tank. The beneficial effect of this invention using the above technical solution is that it enables automatic control of the dosing amount.

[0004] Although the aforementioned patent can achieve automatic control of the dosage, when adding liquid medicine into the dosing tank, since the dosing tank does not have a filtration function, particulate impurities in the liquid medicine may enter the dosing pump, causing pump wear, shortening its service life, clogging of nozzles or metering valves, affecting dosing accuracy, or even causing system shutdown. Utility Model Content

[0005] The purpose of this invention is to provide a chemical dosing device for circulating cooling water in thermal power plants to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A chemical dosing device for circulating cooling water in a thermal power plant, comprising:

[0008] The dosing tank has a vertical filter cylinder fixedly connected to the middle of its inner top wall, and the filter cylinder is equipped with a filtration mechanism.

[0009] A vertical pipe is fixedly connected to the middle of the inner bottom wall of the dosing tank, and a waste discharge mechanism is provided between the vertical pipe and the filtration mechanism;

[0010] A water pump is fixedly connected to the bottom left side of the dosing tank, and a circulation mechanism is provided between the water pump and the dosing tank.

[0011] Preferably, the filtration mechanism includes a filter groove with equal arc opening around the circumference of the filter cylinder, and a filter screen fixedly connected inside the filter groove.

[0012] Preferably, the waste discharge mechanism includes a piston rod that is slidably connected to the middle of the bottom end of the filter cylinder, the top end of the piston rod extends into the interior of the filter cylinder and is fixedly connected to a lifting plate, and the bottom end of the piston rod extends into the interior of the vertical pipe and slides in cooperation with the inner wall of the vertical pipe.

[0013] Preferably, the waste discharge mechanism further includes a waste collection box fixedly connected to the top of the dosing tank, and a sewage pipe fixedly connected to the bottom left side of the waste collection box. A tapered guide tube is fixedly connected to the middle of the top of the dosing tank, and the tapered guide tube is connected to the filter cylinder. A box cover is hinged to the top of the waste collection box.

[0014] Preferably, the circulation mechanism includes a suction pipe fixedly connected between the dosing tank and the water pump, a reversing valve fixedly connected to the output end of the water pump, one end of the reversing valve fixedly connected to the vertical pipe, and the other end fixedly connected to the discharge pipe, and a plurality of discharge holes are opened at the outer end of the top of the vertical pipe with equal arc.

[0015] Preferably, a liquid level sensor is fixedly connected to the lower left side of the dosing tank, and a discharge pipe is fixedly connected to the end of the dosing tank away from the liquid level sensor.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. This circulating cooling water dosing device for thermal power plants achieves online filtration of the chemical solution through the combined use of a filter screen and a lifting plate. This effectively intercepts particulate impurities and avoids clogging of the dosing system, solving the problems of pump wear and reduced metering accuracy caused by impurities in the chemical solution in traditional devices.

[0018] 2. This circulating cooling water dosing device for thermal power plants, through the linkage of piston rod, water pump and discharge port, forms a circulating backflow of the chemical solution while lifting the filter components for cleaning, thereby achieving mixing of the stored liquid and preventing sedimentation. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall main structure of this utility model;

[0020] Figure 2 This is a schematic cross-sectional view of the overall structure of this utility model;

[0021] Figure 3 For the present utility model Figure 2Enlarged view of point A in the middle;

[0022] Figure 4 For the present utility model Figure 2 Enlarged diagram of point B in the middle.

[0023] In the diagram: 1. Dosing tank; 2. Filter cylinder; 3. Vertical pipe; 4. Water pump; 5. Filter tank; 6. Filter screen; 7. Piston rod; 8. Lifting plate; 9. Waste collection box; 10. Drain pipe; 11. Conical guide pipe; 12. Tank cover; 13. Drug extraction pipe; 14. Reversing valve; 15. Drug outlet pipe; 16. Discharge hole; 17. Liquid level sensor; 18. Discharge pipe. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] like Figure 1-4 As shown, this utility model provides a technical solution:

[0026] A chemical dosing device for circulating cooling water in a thermal power plant includes a dosing tank 1, with a vertical filter cylinder 2 fixedly connected to the middle of its inner top wall. The filter cylinder 2 contains a filtration mechanism, which includes filter grooves 5 formed at equal arcs around the circumference of the filter cylinder 2, and a filter screen 6 fixedly connected inside the filter grooves 5. A vertical pipe 3 is fixedly connected to the middle of the inner bottom wall of the dosing tank 1. A waste discharge mechanism is provided between the vertical pipe 3 and the filtration mechanism. The waste discharge mechanism includes a piston rod 7 slidably connected to the middle of the bottom end of the filter cylinder 2. The top end of the piston rod 7 extends into the interior of the filter cylinder 2 and is fixedly connected to a lifting plate 8. The bottom end of the piston rod 7 extends into the interior of the vertical pipe 3 and slides against the inner wall of the vertical pipe 3. The waste discharge mechanism also includes a waste collection box 9 fixedly connected to the top of the dosing tank 1, and a waste collection box 9 fixedly connected to the waste collection box 9. The waste collection box 9 has a drain pipe 10 at the bottom left side, a tapered conical tube 11 fixedly connected to the top center of the dosing tank 1, the tapered conical tube 11 being connected to the filter cartridge 2, a box cover 12 hinged to the top of the waste collection box 9, a water pump 4 fixedly connected to the bottom left side of the dosing tank 1, a circulation mechanism between the water pump 4 and the dosing tank 1, the circulation mechanism including a suction pipe 13 fixedly connected between the dosing tank 1 and the water pump 4, a reversing valve 14 fixedly connected to the output end of the water pump 4, one end of the reversing valve 14 fixedly connected to the vertical pipe 3, and the other end fixedly connected to the discharge pipe 15, a number of discharge holes 16 with equal arcs are opened on the outer side of the top of the vertical pipe 3, a liquid level sensor 17 is fixedly connected to the lower left side of the dosing tank 1, and a discharge pipe 18 is fixedly connected to the end of the dosing tank 1 away from the liquid level sensor 17.

[0027] In this embodiment, the online filtration of the liquid medicine is achieved by using the filter screen 6 in conjunction with the lifting plate 8, which effectively intercepts particulate impurities and avoids clogging of the dosing system, thus solving the problems of pump wear and reduced metering accuracy caused by impurities in the liquid medicine in traditional devices.

[0028] Furthermore, through the coordinated operation of piston rod 7, water pump 4 and discharge port 16, the filter assembly is cleaned while the liquid is circulated back, thus achieving liquid mixing and preventing sedimentation.

[0029] Working principle: When adding chemicals to the circulating cooling water system, the reversing valve 14 switches to the working state connecting the water pump 4 and the discharge pipe 18, ensuring a stable delivery of the treated chemical solution to the cooling water pipeline. During chemical replenishment, the operator opens the tank cover 12 and inserts the dosing hose into the conical conduit 11. The treated solution enters the filter cartridge 2 through the conical conduit 11, where impurities are trapped by the filter screen 6. The purified solution then smoothly enters the dosing tank 1 for storage. When the filtration system needs maintenance, the pipeline connection is switched by the reversing valve 14, so that the water pump 4 and the vertical pipe 3 form a passage. The pressurized liquid enters the vertical pipe 3 and pushes the piston rod 7 upward. After the discharge hole 16 is exposed, the liquid forms a circulating jet. On the one hand, the liquid is sprayed through the discharge hole 16 to mix the stored liquid and prevent sedimentation. On the other hand, it drives the lifting plate 8 to rise synchronously, lifting the impurity layer deposited on the surface of the filter screen 6. When the piston rod 7 reaches its maximum stroke, the upper surface of the lifting plate 8 is slightly higher than the upper surface of the conical guide tube 11. At this time, the box cover 12 is opened, and the impurities trapped by the lifting plate 8 are removed along the annular guide groove between the conical guide tube 11 and the waste collection box 9 using a scraper. Finally, the waste residue cleaning operation is completed by rinsing the drain pipe 10 with clean water.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A chemical dosing device for circulating cooling water in a thermal power plant, characterized in that: include The dosing tank (1) has a vertical filter cylinder (2) fixedly connected to the middle of its inner top wall, and the filter cylinder (2) is equipped with a filtration mechanism inside; A vertical pipe (3) is fixedly connected to the middle of the inner bottom wall of the dosing tank (1), and a waste discharge mechanism is provided between the vertical pipe (3) and the filter mechanism; A water pump (4) is fixedly connected to the bottom left side of the dosing tank (1), and a circulation mechanism is provided between the water pump (4) and the dosing tank (1).

2. The power plant circulating cooling water chemical feeding device according to claim 1, characterized in that: The filtration mechanism includes a filter groove (5) with equal arc opening around the filter cylinder (2) and a filter screen (6) fixedly connected inside the filter groove (5).

3. The device for adding chemicals to circulating cooling water in a thermal power plant according to claim 1, characterized in that: The waste discharge mechanism includes a piston rod (7) that is slidably connected to the middle of the bottom end of the filter cylinder (2). The top end of the piston rod (7) extends into the interior of the filter cylinder (2) and is fixedly connected to a lifting plate (8). The bottom end of the piston rod (7) extends into the interior of the vertical pipe (3) and slides in cooperation with the inner wall of the vertical pipe (3).

4. The power plant circulating cooling water chemical feeding device according to claim 3, characterized in that: The waste discharge mechanism also includes a waste collection box (9) fixedly connected to the top of the dosing tank (1) and a sewage pipe (10) fixedly connected to the bottom left side of the waste collection box (9). A tapered conical tube (11) is fixedly connected to the middle of the top of the dosing tank (1). The tapered conical tube (11) is connected to the filter cylinder (2). A box cover (12) is hinged to the top of the waste collection box (9).

5. The power plant circulating cooling water chemical feeding device according to claim 1, characterized in that: The circulation mechanism includes a drug extraction pipe (13) fixedly connected between the drug addition tank (1) and the water pump (4). The output end of the water pump (4) is fixedly connected to a reversing valve (14). One end of the reversing valve (14) is fixedly connected to the vertical pipe (3), and the other end is fixedly connected to a drug outlet pipe (15). The top of the vertical pipe (3) has several discharge holes (16) with equal arcs.

6. The power plant circulating cooling water chemical feeding device according to claim 1, characterized in that: A liquid level sensor (17) is fixedly connected to the lower left side of the dosing tank (1), and a discharge pipe (18) is fixedly connected to the end of the dosing tank (1) away from the liquid level sensor (17).

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