Air pressure driven dosing device and method and water treatment system

Abstract

The invention relates to a pneumatically-driven dosing device, a pneumatically-driven dosing method and a water treatment system. An air pressure driven medicine adding device comprises a tank body, a medicine bag, a pressure-resistant hose, a weighing sensor, an air inlet valve set, an exhaust valve and a pressure sensor, the tank body is provided with an air inlet, an exhaust port and a medicine inlet, the medicine bag is arranged in the tank body, one end of the medicine bag is communicated with the medicine inlet, one end of the pressure-resistant hose is communicated with the other end of the medicine bag, and the weighing sensor is arranged in the tank body. The weighing sensor is provided with a weighing end, the other end of the medicament bag is located at the weighing end, the air inlet valve set is arranged at the air inlet, the exhaust valve is arranged at the exhaust port, and the pressure sensor is arranged in the tank body. According to the air pressure driven dosing device disclosed by the invention, the medicament bag is arranged in the closed tank body, the gas is used for pressurizing, and the weighing sensor is combined for carrying out direct and real-time quality monitoring, so that stable and reliable dosing of medicaments is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wastewater treatment, and particularly relates to a gas pressure driven dosing device, method and water treatment system. BACKGROUND

[0002] In the process of wastewater treatment in power plants, various types of chemical agents (such as corrosion and scale inhibitors, phosphates, lime, sodium carbonate, etc.) need to be stably added to the system. The dosing device in the related art generally adopts a mechanical pumping mode, such as a metering pump, a diaphragm pump or a peristaltic pump. However, the metering accuracy of the mechanical pump delivery mode is insufficient and the stability is poor. The core working principle of the mechanical pump determines that the output will inevitably have a periodic pulse. This intermittent addition mode causes the concentration of the chemical agent in the system to fluctuate continuously, and a stable chemical environment cannot be formed. Especially when adding at low flow, the pulse effect is more pronounced, making it difficult to achieve a stable dose. At the same time, the metering accuracy of the pump is easily affected by changes in back pressure, medium viscosity, inlet pressure fluctuations and wear and aging of key components (such as diaphragms, one-way valves and hoses). The accuracy decays seriously under long-term operation, resulting in "leakage" of the addition amount, which not only causes waste of the chemical agent, but also has low reliability and high maintenance costs. The internal structure of the mechanical pump is complex, and there are many moving parts, which are prone to failure. The inlet and outlet one-way valves are easily jammed by chemical agent crystals or impurities, leading to failure. The diaphragm is easily fatigued and torn. The peristaltic pump hose needs to be replaced regularly. These factors result in high equipment failure rate, large maintenance workload and expensive spare parts, which directly affects the continuity and reliability of chemical supervision in power plants. Furthermore, the traditional dosing equipment has poor adaptability and inherent dead zones. For high-viscosity, easily crystallizing or corrosive chemical agents, the mechanical pump is prone to clogging, corrosion and leakage. In addition, the "dead zone" existing in the pump body and connecting pipeline will cause the chemical agent to remain, which not only causes cross contamination, but also makes it difficult to clean when switching between agents or batches, and makes it difficult to accurately measure the actual addition amount. SUMMARY

[0003] The present application aims to at least partially solve one of the technical problems in the related art.

[0004] To this end, an embodiment of the present application provides a gas pressure driven dosing device, which comprises a tank body, a chemical agent bag, a pressure-resistant hose, a weighing sensor, an air inlet valve group, an air outlet valve and a pressure sensor. The tank body is provided with an air inlet, an air outlet and a chemical agent inlet. The chemical agent bag is arranged in the tank body. One end of the chemical agent bag is in communication with the chemical agent inlet. One end of the pressure-resistant hose is in communication with the other end of the chemical agent bag. The other end of the pressure-resistant hose forms a chemical agent outlet. The weighing sensor is provided with a weighing end, and the other end of the chemical agent bag is located on the weighing end. The air inlet valve group is arranged at the air inlet. The air outlet valve is arranged at the air outlet. The pressure sensor is arranged in the tank body.

[0005] The gas pressure driven dosing device of the embodiment of the present application realizes stable and reliable dosing of the medicament by placing the medicament bag in the closed tank, pressurizing by using the inert gas, and combining the weighing sensor placed below the outlet of the medicament bag to directly and timely monitor the quality, thereby forming a high-precision and full-closed loop feedback control system.

[0006] In some embodiments, a hanging ring is arranged on the medicament bag, and a hook is arranged in the tank.

[0007] In some embodiments, a first magnetic attraction member is arranged on the medicament bag, and a second magnetic attraction member is arranged in the tank, and the first magnetic attraction member and the second magnetic attraction member are magnetically connected.

[0008] In some embodiments, the other end of the medicament bag is provided with a hard discharge pipe, and the one end of the pressure-resistant hose is inserted into the hard discharge pipe.

[0009] In some embodiments, the pressure-resistant hose comprises a weighing section, a sealing section and a connecting section connected in sequence, the weighing section is connected to the other end of the medicament bag, the weighing section is arranged on the weighing end, at least part of the sealing section is arranged in a U shape and is arranged on the side of the weighing section and the connecting section facing the one end of the medicament bag, and the outlet of the connecting section forms the medicament outlet.

[0010] In some embodiments, the gas pressure driven dosing device further comprises a dosing main pipeline and a dosing valve, the dosing main pipeline is arranged on the tank, one end of the dosing main pipeline is communicated with the medicament outlet, the other end of the dosing main pipeline extends out of the tank, and the dosing valve is arranged on the dosing main pipeline.

[0011] In some embodiments, the air inlet valve group comprises a first pressure reducing valve, a second pressure reducing valve and an air inlet electromagnetic valve, the first pressure reducing valve, the second pressure reducing valve and the air inlet electromagnetic valve are arranged on the pipeline of the air inlet in sequence, and the air inlet electromagnetic valve is arranged downstream of the second pressure reducing valve.

[0012] In some embodiments, the gas pressure driven dosing device further comprises a controller, and the air inlet valve group, the air outlet valve, the pressure sensor and the weighing sensor are electrically connected to the controller.

[0013] In some embodiments, a quick opening flange cover is arranged on the tank, and the air inlet is arranged on the quick opening flange cover.

[0014] The gas pressure driven dosing method of the embodiment of the present application adopts the gas pressure driven dosing device, and comprises the following steps. S1: injecting a preset weight of medicament into the medicament bag; S2: Gas is introduced into the tank to make the gas pressure inside the tank reach a preset value, which drives the medicine in the medicine bag to be discharged through the pressure-resistant hose, thereby realizing the medicine addition; S3: When the weighing sensor detects that the weight of the medicine bag has reached the shut-off threshold, the air intake valve group is closed.

[0015] The water treatment system of this invention includes the aforementioned pneumatically driven dosing device. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the pneumatically driven dosing device according to an embodiment of the present invention.

[0017] Figure label: 100. Dosing device; 1. Tank body; 11. Air inlet; 12. Exhaust outlet; 13. Medicine inlet; 14. Hook; 15. Quick-opening flange cover; 16. Inspection door; 2. Medicine bag; 21. Hanging ring; 22. Rigid discharge pipe; 3. Pressure-resistant hose; 31. Weighing section; 32. Sealing section; 33. Connecting section; 4. Weighing sensor; 41. Pallet; 5. Intake valve assembly; 51. First pressure reducing valve; 52. Second pressure reducing valve; 53. Intake solenoid valve; 6. Exhaust valve, 7. Pressure sensor, 8. Main dosing pipeline, 9. Dosing valve, 10. Controller. Detailed Implementation

[0018] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0019] The pneumatically driven dosing device, method, and water treatment system of the present invention are described in detail below with reference to the accompanying drawings.

[0020] The water treatment system of this invention includes a pneumatically driven dosing device.

[0021] like Figure 1 As shown, the pneumatically driven dosing device 100 of this embodiment includes a tank 1, a medicine bag 2, a pressure-resistant hose 3, a weighing sensor 4, an air inlet valve group 5, an exhaust valve 6, and a pressure sensor 7.

[0022] The tank body 1 is equipped with an air inlet 11, an exhaust outlet 12, and a medicine inlet 13. A medicine bag 2 is located inside the tank body 1, with one end (upper end) of the medicine bag 2 connected to the medicine inlet 13. One end of a pressure-resistant hose 3 is connected to the other end (lower end) of the medicine bag 2, forming a medicine outlet. A weighing sensor 4 has a weighing end, with the other end of the medicine bag 2 located on the weighing end. An air inlet valve assembly 5 is located at the air inlet 11, an exhaust valve 6 is located at the exhaust outlet 12, and a pressure sensor 7 is located inside the tank body 1.

[0023] The air inlet 11 is connected to the air supply source via an air inlet pipe. An air inlet valve assembly 5 is located on the air inlet pipe and controls the opening and closing of the air inlet pipe. A pressure sensor 7 is used to monitor the pressure inside the tank 1. One end of the pressure-resistant hose 3 is located at the lower end of the medicine bag 2, and this end is connected to the medicine bag 2, allowing the medicine inside the medicine bag 2 to accumulate with this end of the pressure-resistant hose 3 as the lowest point. A weighing sensor measures the weight of the medicine bag 2, the medicine, and the pressure-resistant hose 3 by weighing the other end of the medicine bag 2. It should be noted that since the medicine bag 2 and the pressure-resistant hose 3 themselves have a certain weight, this weight must be deducted when calculating the weight of the medicine.

[0024] Before use, the pneumatically driven dosing device 100 of this embodiment of the invention is at atmospheric pressure in tank 1 (the tank 1 can be restored to atmospheric pressure by opening the exhaust valve 6 to release the gas).

[0025] The pneumatic-driven dosing method of this invention uses a pneumatic-driven dosing device 100 and includes the following steps: S1: Inject a preset weight of medicine into medicine bag 2. When the reading of the weighing sensor reaches the preset weight, it is determined that the injected medicine dosage has reached the preset weight.

[0026] S2: Gas is introduced into tank 1 to bring the pressure inside tank 1 to a preset value, causing the agent in the agent bag 2 to be discharged through the pressure-resistant hose 3, thus realizing the agent dosing. When the monitoring value of pressure sensor 7 reaches the preset value, it indicates that the pressure inside tank 1 has reached the preset value. The high pressure inside tank 1 acts evenly on the agent bag 2, driving the agent to be stably added at a high flow rate.

[0027] S3: When the weighing sensor 4 detects that the weight of the medicine bag has reached the shut-off threshold, the air intake valve group 5 is closed. The dosing process is completed.

[0028] The pneumatically driven dosing device 100, or method, of this invention creates a high-pressure environment within the tank 1 by introducing gas into the tank 1. The high-pressure gas smoothly compresses the drug bag 2, and a high-precision weighing sensor is used for real-time mass measurement. This achieves pulse-free, ultra-high precision (up to +0.1%) drug dosing, thereby overcoming the technical defects of traditional mechanical pumps such as pulse fluctuations, mechanical wear, easy clogging, and residue. It has significant advantages such as reliable operation, low maintenance cost, and no cross-contamination.

[0029] Specifically, the tank body 1 is equipped with a quick-opening flange cover 15, and the quick-opening flange cover 15 is equipped with a medicine inlet 13. The quick-opening flange cover 15 can be opened quickly, and after the flange cover is opened, it is convenient to put the medicine bag 2 into the tank body 1, and it is convenient for personnel to connect and connect the medicine inlet 13 with the inlet at the upper end of the medicine bag 2.

[0030] The air inlet 11, exhaust outlet 12 and medicine inlet 13 of the tank body 1 are all located at the upper end of the tank body 1.

[0031] One side of tank 1 is equipped with an inspection door for easy maintenance.

[0032] In some embodiments, the medicine bag 2 is provided with a hanging ring 21, and the can body 1 is provided with a hook 14, with the hanging ring 21 being installed on the hook 14.

[0033] In some other embodiments, the medicine bag 2 is provided with a first magnetic suction element, and the can body 1 is provided with a second magnetic suction element, and the first magnetic suction element and the second magnetic suction element are magnetically connected.

[0034] The operator, outside the tank, uses a hanging rod or magnetic attraction to connect the hanging part (hanging ring 21 or first magnetic attraction) at the upper end of the new medicine bag 2 to the corresponding hanging point (hook 14 or second magnetic attraction) fixed inside the tank body 1, so that the medicine bag 2 hangs naturally in the center of the tank body 1.

[0035] Medicine bag 2 is a flexible medicine bag 2.

[0036] The other end (lower end) of the medicine bag 2 is provided with a rigid discharge pipe 22, and one end of the pressure-resistant hose 3 is inserted into the rigid discharge pipe 22. The rigid discharge pipe 22 and the pressure-resistant hose 3 are rigidly connected to ensure the sealing and reliability of the connection between the medicine bag 2 and the pressure-resistant hose 3.

[0037] Specifically, a quick-connect female connector is provided at the end of the rigid discharge pipe 22, and a quick-connect male connector is provided at the same end of the pressure-resistant hose 3. The quick-connect male connector and the quick-connect female connector are connected by plugging in.

[0038] The pressure-resistant hose 3 includes a weighing section 31, a sealing section 32, and a connecting section 33 connected in sequence. The weighing section 31 is connected to the other end of the medicine bag 2 and is located on the weighing end. At least a portion of the sealing section 32 forms a U-shape and is located on one side of the weighing section 31 and the connecting section 33 facing the end of the medicine bag 2. The outlet of the connecting section 33 forms a medicine outlet. Figure 1 As shown, the sealing section 32 is U-shaped and located on the upper side of the connection end. The pressure-resistant hose 3 naturally forms a U-shaped bend "first up and then down" inside the tank 1 through the sealing section 32, and its highest point is higher than the drug outlet.

[0039] The pressure-resistant hose 3 itself does not deform with pressure changes, ensuring its constant mass. This eliminates interference from the weighing sensor readings caused by the deformation of the pipeline itself, allowing the weighing sensor readings to accurately reflect changes in the quality of the reagent. Simultaneously, it isolates external mechanical interference; the flexibility of the pressure-resistant hose 3 effectively absorbs and isolates vibrations and stresses from external pipelines, creating a clean and stable measurement environment for the weighing sensor.

[0040] Specifically, the pressure-resistant hose 3 has a spiral reinforcing skeleton inside.

[0041] The pneumatically driven dosing device 100 further includes a main dosing pipeline 8 and a dosing valve 9. The main dosing pipeline 8 is located on the tank body 1, with one end connected to the reagent outlet and the other end extending out of the tank body 1. The dosing valve 9 is located on the main dosing pipeline 8. The other end of the main dosing pipeline 8 is located below the sealing section 32.

[0042] The weighing sensor 4 is located on the outside of the tank body. The weighing sensor 4 is equipped with a tray 41, which forms the weighing end. The tray 41 is located inside the tank body 1.

[0043] The intake valve assembly 5 includes a first pressure reducing valve 51, a second pressure reducing valve 52, and an intake solenoid valve 53. The first pressure reducing valve 51, the second pressure reducing valve 52, and the intake solenoid valve 53 are sequentially arranged on the pipeline of the intake port 11, with the intake solenoid valve 53 located downstream of the second pressure reducing valve 52.

[0044] The pneumatically driven dosing device 100 further includes a controller 10, an intake valve group 5, an exhaust valve 6, a pressure sensor 7, and a weighing sensor, all of which are electrically connected to the controller 10.

[0045] In this embodiment, a high-pressure nitrogen gas source is used. Using nitrogen as the driving gas has the following advantages: 1) Nitrogen is an inherent component of air, and its release into the atmosphere after the dosing process will not cause environmental pollution; 2) Nitrogen is an inert gas, effectively isolating oxygen during the dosing process, preventing the drug from being oxidized and becoming ineffective, clumping, or precipitating, ensuring the stability and efficacy of the added drug; 3) Nitrogen as the driving medium entering the tank prevents water vapor from entering the system, preventing corrosion of key components such as valves inside the tank due to a humid environment, effectively extending the equipment's service life.

[0046] The outlet of the nitrogen source is connected to a first pressure reducing valve 51. The first pressure reducing valve 51 initially and continuously reduces the pressure, providing a stable and suitable input pressure platform for the subsequent second pressure reducing valve 52. The second pressure reducing valve 52 is located after the first pressure reducing valve 51 and before the inlet solenoid valve 53. The second pressure reducing valve 52 is electrically connected to the controller 10 and receives control signals. The pressure of the second pressure reducing valve 52 is continuously and precisely adjusted to control the dosage rate of the reagent. The inlet solenoid valve 53 is installed after the second pressure regulating valve and directly connected to the air inlet 11 of the tank 1. The inlet solenoid valve 53 is electrically connected to the system control feedback system and is controlled by a switch signal to control the on / off state of the gas path, thus starting and stopping the dosage process.

[0047] In step S2, after the reagent bag 2 is filled with reagent, the pneumatically driven dosing device 100 is in a "ready" state, with the dosing valve 9 and exhaust valve 6 closed. The filling operation begins by opening the first pressure reducing valve 51, the second pressure reducing valve 52, and the air inlet solenoid valve 53. In the first stage, the controller 10 controls the second pressure regulating valve to set the pressure at a higher pressure P1. Nitrogen enters the tank 1, establishing pressure P1 in the cavity between the reagent bag 2 and the tank 1. This pressure acts evenly on the flexible reagent bag 2, driving the reagent to be added stably at a higher flow rate. The second stage is the precise dosing stage. When the added amount reaches the first threshold, the pressure in the tank 1 is controlled to remain constant at the set pressure P2, where P2 < P1. The switching between P1 and P2 depends on the reading of the weighing mass sensor. This two-stage pressure control strategy can adjust the dosing speed based on real-time weighing feedback, balancing dosing efficiency and endpoint accuracy, providing a stable dosing solution for power plant water treatment systems.

[0048] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0049] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0050] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0051] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0052] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0053] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A pneumatically driven dosing device (100), characterized in that, include: The tank (1) is provided with an air inlet (11), an exhaust outlet (12) and a medicine inlet (13). Medicine bag (2), the medicine bag (2) is placed inside the tank (1), and one end of the medicine bag (2) is connected to the medicine inlet (13); Pressure-resistant hose (3), one end of which is connected to the other end of the medicine bag (2), and the other end of which forms a medicine outlet; Weighing sensor (4), the weighing sensor (4) is provided with a weighing end, and the other end of the medicine bag (2) is located on the weighing end; The air intake valve assembly (5), the exhaust valve (6), and the pressure sensor (7) are provided. The air intake valve assembly (5) is located at the air intake port (11), the exhaust valve (6) is located at the exhaust port (12), and the pressure sensor (7) is located inside the tank body (1).

2. The pneumatically driven dosing device (100) according to claim 1, characterized in that, The medicine bag (2) is provided with a hanging ring (21), and the can body (1) is provided with a hook (14). The hanging ring (21) is fitted onto the hook (14); or, The medicine bag (2) is provided with a first magnetic suction element, and the can body (1) is provided with a second magnetic suction element. The first magnetic suction element and the second magnetic suction element are magnetically connected.

3. The pneumatically driven dosing device (100) according to claim 1, characterized in that, The other end of the medicine bag (2) is provided with a rigid discharge pipe (22), and one end of the pressure-resistant hose (3) is inserted into the rigid discharge pipe (22).

4. The pneumatically driven dosing device (100) according to claim 1, characterized in that, The pressure-resistant hose (3) includes a weighing section (31), a sealing section (32), and a connecting section (33) connected in sequence. The weighing section (31) is connected to the other end of the medicine bag (2) and is located on the weighing end. At least a portion of the sealing section (32) forms a U-shape and is located on one side of the weighing section (31) and the connecting section (33) facing the end of the medicine bag (2). The outlet of the connecting section (33) forms the medicine outlet.

5. The pneumatically driven dosing device (100) according to claim 1, characterized in that, It further includes a main dosing pipeline (8) and a dosing valve (9). The main dosing pipeline (8) is located on the tank body (1). One end of the main dosing pipeline (8) is connected to the agent outlet, and the other end of the main dosing pipeline (8) extends out of the tank body (1). The dosing valve (9) is located on the main dosing pipeline (8).

6. The pneumatically driven dosing device (100) according to claim 1, characterized in that, The intake valve assembly (5) includes a first pressure reducing valve (51), a second pressure reducing valve (52), and an intake solenoid valve (53). The first pressure reducing valve (51), the second pressure reducing valve (52), and the intake solenoid valve (53) are sequentially arranged on the pipeline of the intake port (11). The intake solenoid valve (53) is located downstream of the second pressure reducing valve (52).

7. The pneumatically driven dosing device (100) according to claim 1, characterized in that, The system further includes a controller (10), wherein the intake valve assembly (5), the exhaust valve (6), the pressure sensor (7), and the weighing sensor are all electrically connected to the controller (10).

8. The pneumatically driven dosing device (100) according to claim 1, characterized in that, The tank body (1) is provided with a quick-opening flange cover (15), and the quick-opening flange cover (15) is provided with the medicine inlet (13).

9. A pneumatically driven dosing method, characterized in that, The pneumatically driven dosing device (100) according to any one of claims 1 to 8 includes the following steps: S1: Inject a predetermined weight of medicine into the medicine bag (2); S2: Gas is introduced into the tank (1) to make the gas pressure inside the tank (1) reach a preset value, thereby driving the medicine in the medicine bag (2) to be discharged through the pressure-resistant hose (3) to realize the medicine addition; S3: When the weighing sensor (4) detects that the weight of the medicine bag has reached the shut-off threshold, the air intake valve group (5) is closed.

10. A water treatment system, characterized in that, Includes the pneumatically driven dosing device (100) according to any one of claims 1 to 8.

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