A smart chemical dosing device and its dosing system for boilers

Abstract

This invention discloses an intelligent chemical dosing device and its dosing system for boilers, relating to the field of industrial water treatment technology. The device includes a support frame with several connecting brackets fixedly connected inside. Two chemical tanks are mounted on top of the support frame. A surrounding frame is fixedly connected above the connecting brackets, enclosing the chemical tanks. A dispensing pipe is fixedly connected to the lower side of one side of each chemical tank. An ultrasonic transducer is fixedly connected to the outer wall of the dispensing pipe. One end of the dispensing pipe is connected to a T-junction pipe, which is connected to an air compressor and a delivery pipe. The delivery pipe is connected to a first metering pump, which is connected to a second delivery pipe. The second delivery pipe is connected to a third delivery pipe, which is connected to a third T-junction pipe. A connecting pipe is connected to the third T-junction pipe. A horizontal plate is fixed to the top of the surrounding frame, and a stirring motor is fixed to the horizontal plate. The output shaft of the stirring motor is connected to a stirring rod. This invention ensures stable boiler water treatment performance.

Description

Technical Field

[0001] This invention relates to the field of industrial water treatment technology, specifically to an intelligent chemical dosing device and its dosing system for boilers. Background Technology

[0002] Intelligent chemical dosing devices for boilers are automated devices specifically designed for industrial boiler water treatment. Their core purpose is to replace traditional manual dosing methods. Through real-time monitoring and automatic control, they accurately and scientifically add chemical agents to the boiler and water system to ensure the safe, efficient, energy-saving, and environmentally friendly operation of the boiler.

[0003] Traditional manual dosing often requires periodic sampling, such as every 2-4 hours, to bring samples back to the laboratory for analysis. The data obtained is intermittent and delayed. Afterwards, operators estimate the dosage based on the test results and manually adjust the dosing pump, which relies too heavily on personal experience and results in large fluctuations in the dosing results. On the other hand, some relatively intelligent dosing devices often cannot guarantee cleanliness after long-term use, resulting in impurities in the pipeline that affect the delivery of chemicals from the tank to the boiler, ultimately leading to unsatisfactory water treatment results. Therefore, it is necessary to design an intelligent dosing device and system for boilers. Summary of the Invention

[0004] The purpose of this invention is to provide an intelligent chemical dosing device and dosing system for boilers to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an intelligent dosing device for boilers, including a support frame, a plurality of connecting frames fixedly connected inside the support frame, two medicine tanks installed on the top of the support frame, and a surrounding frame fixedly connected above the connecting frames to surround the medicine tanks;

[0006] A medicine outlet pipe is fixedly connected to the lower side of the medicine tank. An ultrasonic transducer is fixedly connected to the outer wall of the medicine outlet pipe. One end of the medicine outlet pipe is connected to a three-way pipe. The three-way pipe is connected to an air compressor and a delivery pipe. The delivery pipe is connected to a first metering pump.

[0007] The first metering pump is connected to a second delivery pipe, the second delivery pipe is connected to a third delivery pipe, the third delivery pipe is connected to a tee pipe, and the tee pipe is connected to a connecting pipe.

[0008] A horizontal plate two is fixed to the top of the enclosure frame, and a stirring motor is fixed to the horizontal plate two. The output shaft of the stirring motor is connected to a stirring rod, and the stirring rod is connected to a connecting collar, a horizontal stirring blade, and a vertical stirring blade. The horizontal stirring blade is connected to a first scraper, and the vertical stirring blade is connected to a second scraper and a positioning ring.

[0009] An extension frame is connected to one side of the bracket, and a control cabinet is installed on top of the extension frame;

[0010] The connecting pipe is equipped with a rotating brush and a cover.

[0011] According to the above technical solution, a support column is fixedly connected to one end of the connecting frame, and a horizontal plate is fixedly connected to the top of the support column. There are three horizontal plates in total. The first metering pump is fixedly connected to one of the horizontal plates, and the second metering pump and the third metering pump are fixedly connected to the top of the other horizontal plates respectively. The two medicine tanks adopt a parallel liquid supply method, and after the flow merges, the liquid is drawn and added in parallel by the three metering pumps.

[0012] According to the above technical solution, the distance from the first scraper below the three horizontal stirring blades to the connecting collar increases sequentially, and the distance from the second scraper on the three vertical stirring blades to the positioning ring increases sequentially, respectively covering the area from the center to the edge of the bottom surface of the medicine tank and from the top to the bottom of the inner wall.

[0013] According to the above technical solution, the ultrasonic transducer is fixedly connected to the outer wall of the drug outlet tube by bolts and matching flange. The ultrasonic vibration generated by the ultrasonic transducer first passes through the drug outlet tube and then enters the fluid inside the tube. The wall of the drug outlet tube is part of the vibration system.

[0014] According to the above technical solution, the medicine tank is connected to a gas phase balance pipe and a sewage discharge pipe;

[0015] The air compressor is connected to the pipeline of the tee pipe one through a gas injection connector, and a one-way valve is installed in the pipeline to prevent the medicine from flowing in;

[0016] An electrically controlled valve is installed on the pipeline leading from the three-way pipe to the boiler, and a bypass return valve is also installed between the three-way delivery pipe and the medicine tank.

[0017] According to the above technical solution, a through groove is provided above the connecting pipe, a baffle is slidably connected in the through groove, guide grooves are processed on both sides of the through groove, and an elastic pressure strip is fixed to the upper edge of the through groove by bolts, and the bottom of the elastic pressure strip is in contact with the upper surface of the baffle.

[0018] The baffle has a fluororubber lip sealing strip embedded in its annular sealing groove, and the lip facing the inside of the connecting pipe has a wear-resistant coating.

[0019] According to the above technical solution, a rotating shaft is provided through the middle of the rotating brush, and a hollow cavity is opened in the middle section of the rotating shaft. A cover is installed inside the connecting pipe. The cover is located on the side of the rotating brush close to the rotating shaft and is connected to it through a sealed bearing.

[0020] A built-in micro motor is installed on the rotating shaft. The micro motor is embedded in the hollow cavity in the middle section of the rotating shaft. The micro motor is powered by a storage battery, which is integrated inside the casing.

[0021] According to the above technical solution, an electric push rod is installed inside the connecting pipe, and the movable end of the electric push rod is fixedly connected to the middle of the side of the cover away from the rotating brush.

[0022] A connecting rod is fixedly connected to the base of the electric push rod. The connecting rod passes through the baffle. A pneumatic rod is fixedly connected to the wall of the connecting pipe. A clamp is fixedly connected to the movable end of the pneumatic rod. The upper end of the connecting rod is fixedly connected inside the clamp.

[0023] In addition, this application also provides an intelligent chemical dosing system for boilers, which is integrated in a control cabinet. The dosing system includes a detection module and a processing module. The detection module includes a viscosity detection unit and a crystallization detection unit, and the processing module includes a stirring unit and a rotation unit.

[0024] The viscosity detection unit is connected to a viscosity sensor, and the crystallization detection unit is connected to an ultrasonic transducer. The stirring unit is connected to a stirring motor.

[0025] The rotating unit is connected to a micro motor, an electric actuator, and a pneumatic rod via signal transmission.

[0026] According to the above technical solution, the current detection module is integrated in series in the power supply circuit of the micro motor into the processing module.

[0027] Compared with existing technologies, the beneficial effects achieved by this invention are as follows: This invention, by setting up a retractable, conductive, elastic rotating brush and a current detection module connected in series with the micro motor power supply circuit, realizes real-time sensing of crystallization cleaning at the end of the connecting pipe and the scaling trend and impurity content in the boiler water, eliminating the need for additional boiler operating condition detection sensors and improving the integration and operating condition monitoring capabilities of the device; by setting up a control cabinet with an integrated viscosity detection unit, crystallization detection unit, stirring unit, and rotation unit, it realizes dynamic adjustment of reagent viscosity and precise control of metering pump output, replacing traditional manual sampling analysis and experience-based dosing, solving the problems of lagging dosing data and reliance on manual experience, and effectively improving the intelligence and accuracy of dosing. Attached Figure Description

[0028] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0029] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 This is the present invention. Figure 1 Another perspective on the overall structure;

[0031] Figure 3 This is a schematic diagram of the internal structure of the medicine container of the present invention;

[0032] Figure 4 This is the present invention. Figure 3 Enlarged structural diagram of region A in the middle;

[0033] Figure 5 This is the present invention. Figure 3 A magnified structural diagram of region B in the middle;

[0034] Figure 6 This is a schematic diagram of the connecting pipe of the present invention;

[0035] Figure 7 This is a schematic diagram of the internal structure of the connecting pipe of the present invention;

[0036] Figure 8 This is a schematic diagram of the structure of the connecting tube of the present invention after it is pushed out by the electric push rod;

[0037] Figure 9 This is a schematic diagram of the structure of the connecting pipe of the present invention after it is pushed out by the pneumatic rod;

[0038] Figure 10 This is a schematic diagram of the structure of the stirring rod of the present invention;

[0039] Figure 11 This is a diagram of the dosing pipeline for the present invention;

[0040] Figure 12 This is a diagram of the drug delivery system of the present invention;

[0041] Figure 13 This is a schematic diagram of the internal structure of the connecting pipe of the present invention;

[0042] In the diagram: 1. Bracket; 101. Connecting frame; 102. Support column; 103. Enclosing frame; 104. Extension frame; 2. Medicine tank; 3. Horizontal plate one; 401. First metering pump; 402. Second metering pump; 403. Third metering pump; 5. Medicine outlet pipe; 6. Ultrasonic transducer; 7. Air compressor; 8. Delivery pipe one; 9. Delivery pipe two; 10. Delivery pipe three; 11. T-connector; 12. Connecting pipe; 13. Horizontal plate two ; 14. Stirring motor; 15. Gas phase balance pipe; 16. Control cabinet; 17. Rotary brush; 18. Micro motor; 19. Cover; 20. Electric push rod; 21. Connecting rod; 22. Baffle; 23. Pneumatic rod; 24. Clamping plate; 25. Stirring rod; 26. Connecting collar; 27. Horizontal stirring blade; 28. Vertical stirring blade; 29. ​​First scraper; 30. Second scraper; 31. Positioning ring; 32. Drain pipe. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] Example 1; please refer to Figure 1-13 The present invention provides a technical solution: an intelligent dosing device for boilers, including a support 1, which is used to support and fix the entire dosing device to ensure the stability of the device operation;

[0045] The bracket 1 has several connecting frames 101 fixedly connected inside. A support column 102 is fixedly connected to the top of one end of the connecting frame 101. A horizontal plate 3 is fixedly connected to the top of the support column 102. There are three horizontal plates 3. A first metering pump 401, a second metering pump 402 and a third metering pump 403 are fixedly connected to the top of the three horizontal plates 3 respectively. They are used to achieve precise quantitative delivery to the boiler. It should be noted that the first metering pump 401, the second metering pump 402 and the third metering pump 403 are quantitative delivery components and are industrial-grade metering pumps with built-in outlet pressure sensors.

[0046] Furthermore, two medicine containers 2 are installed above the support 1, operating in a one-in-use, one-in-standby configuration. The containers 2 are made of corrosion-resistant material and are used to store medicines. (See reference...) Figure 11 The two medicine tanks 2 are connected in parallel to supply liquid. After the liquid is drawn through a pipeline, it is added by the first metering pump 401, the second metering pump 402 and the third metering pump 403 in parallel, which constitutes the configuration of "two tanks and three pumps".

[0047] refer to Figure 1 A surrounding frame 103 is fixedly connected above the connecting frame 101. The surrounding frame 103 is a semi-enclosed structure surrounding the outside of the medicine tank 2, thereby further achieving the fixing effect of the medicine tank 2 and ensuring the stability of the dosing device operation.

[0048] refer to Figure 1 , Figure 4 A medicine outlet pipe 5 is fixedly connected to the lower side of the two medicine tanks 2 on the side that is not close to the surface. An ultrasonic transducer 6 is fixedly connected to the outer wall of the medicine outlet pipe 5 by bolts and matching flanges. The ultrasonic vibration generated by the ultrasonic transducer 6 first passes through the medicine outlet pipe 5 and then enters the fluid inside the pipe. The pipe wall of the medicine outlet pipe 5 itself also becomes part of the vibration system. Its small vibration helps to prevent internal particles from adhering. At the same time, the ultrasonic transducer 6 itself can also collect sound wave signals.

[0049] Furthermore, a T-connector is fixedly connected to one end of the drug outlet pipe 5, and an air compressor 7 and a delivery pipe 8 are fixedly connected to the other two ends of the T-connector. The other end of the delivery pipe 8 is fixedly connected to the first metering pump 401. The air compressor 7 is connected to the T-connector through a gas injection connector, thereby generating blockage bubbles. These bubbles, in conjunction with the ultrasonic transducer 6, push the blockages in the drug outlet pipe 5 and the delivery pipe 8 toward the pump end. A one-way valve is also installed in this pipeline to prevent the drug from flowing in.

[0050] refer to Figure 1 The other end of the first metering pump 401 is fixedly connected to a second delivery pipe 9, the other end of the second delivery pipe 9 is fixedly connected to a third delivery pipe 10, the other end of the third delivery pipe 10 is fixedly connected to a three-way pipe 11, one end of the other two ends of the three-way pipe 11 is fixedly connected to an air compressor 7, and the other end is fixedly connected to a connecting pipe 12. The other end of the connecting pipe 12 is connected to the boiler, thus realizing the dosing passage from the medicine tank 2 to the boiler.

[0051] refer to Figure 3 , Figure 10 The top of the enclosure frame 103 is fixedly connected to a horizontal plate 13. There are two horizontal plates 13, which are located above the two medicine tanks 2 respectively. A stirring motor 14 is fixedly connected above the horizontal plate 13. A stirring rod 25 is fixedly connected to the output end of the stirring motor 14 through a coupling. A connecting collar 26 is fixedly connected to the bottom end of the stirring rod 25. Three horizontal stirring blades 27 are evenly fixedly connected around the outside of the connecting collar 26. A vertical stirring blade 28 is fixedly connected to the end of the horizontal stirring blade 27 away from the connecting collar 26. A positioning ring 31 is fixedly connected to the top of the vertical stirring blade 28 to ensure the stable connection of the stirring blades, thereby realizing the stirring of the medicine inside the medicine tank 2 and making it evenly mixed.

[0052] Furthermore, each of the three horizontal stirring blades 27 is fixedly connected to a first scraper 29, and the distance from the three first scrapers 29 to the connecting collar 26 increases sequentially. This equal-gradient arrangement allows the scrapers to cover different radius areas from the center to the edge of the bottom surface of the medicine container 2, avoiding cleaning dead corners. Each of the three vertical stirring blades 28 is fixedly connected to a second scraper 30, and the distance from the three second scrapers 30 to the positioning ring 31 also increases sequentially. Similarly, this can cover different height areas from the top to the bottom of the inner wall of the medicine container 2, thereby ensuring the thorough removal of the adhering substances on the bottom surface and inner wall of the medicine container 2 and reducing the residue of medicine in the medicine container 2.

[0053] refer to Figure 2 , Figure 3 The tops of the two medicine tanks 2 are fixedly connected to a gas phase balance pipe 15, and they are interconnected through the gas phase balance pipe 15. A shut-off valve is connected in series in the middle of the gas phase balance pipe 15 to isolate the gas path during single tank maintenance and ensure stable gas pressure in the medicine tank 2. A pipeline is reserved on the side of the gas phase balance pipe 15 for introducing diluent.

[0054] refer to Figure 5-9 A rotating brush 17 is installed inside the connecting pipe 12. A rotating shaft passes through the middle of the rotating brush 17. A hollow cavity is opened in the middle section of the rotating shaft. A cover 19 is installed inside the connecting pipe 12. The cover 19 is located on the side of the rotating brush 17 near the rotating shaft and is connected to it through a sealed bearing to prevent fluid from entering. A built-in micro motor 18 is installed on the rotating shaft. The micro motor 18 is embedded in the hollow cavity in the middle section of the rotating shaft. The output shaft is rigidly connected to the rotating shaft. The micro motor 18 is powered by a battery. The battery is integrated inside the cover 19 and supplies power to the rotating micro motor 18 through the brush.

[0055] A through groove is formed on the upper surface of the connecting pipe 12, and a baffle 22 is slidably connected in the through groove, such as... Figure 13 As shown, the area of ​​the baffle 22 is larger than the area of ​​the groove opening, and the baffle 22 has an annular sealing groove on one side edge facing the inner wall of the connecting pipe 12. A fluororubber lip sealing strip adapted to the boiler chemical working conditions is embedded in the sealing groove.

[0056] Furthermore, guide grooves are symmetrically machined on both sides of the through groove, and an elastic pressure strip is fixed to the upper edge of the through groove by bolts. The bottom of the elastic pressure strip is in contact with the upper surface of the baffle 22. The slight pre-pressure of the pressure strip keeps the baffle 22 in close contact with the lip sealing strip in the through groove, achieving dynamic sealing during sliding. It should be noted that the lip of the lip sealing strip facing the inside of the connecting pipe 12 is provided with a polytetrafluoroethylene wear-resistant coating, which not only avoids the corrosion of the seal by the agent, but also reduces the frictional resistance when the baffle 22 slides, and prevents the agent in the pipe from leaking along the through groove. In addition, a 0.5mm wide slag discharge groove is reserved at the bottom of the sealing groove to discharge any trace amounts of agent residue that may accumulate in the through groove, so as to avoid affecting the sealing effect.

[0057] An electric push rod 20 is installed inside the connecting pipe 12. The movable end of the electric push rod 20 is fixedly connected to the middle of the side of the cover 19 away from the rotating brush 17. The electric push rod 20 is rigidly connected to the middle of the rotating brush 17. At the same time, auxiliary support members are added to both sides of the base and slidably connected to the inner wall of the connecting pipe 12 (not shown in the figure) to disperse the reaction force, thereby realizing the displacement of the rotating brush 17 by driving the electric push rod 20. A connecting rod 21 is fixedly connected to the base of the electric push rod 20. The connecting rod 21 passes through the baffle 22. A pneumatic rod 23 is fixedly connected to the pipe wall of the connecting pipe 12. A clamping plate 24 is fixedly connected to the movable end of the pneumatic rod 23. The upper end of the connecting rod 21 is fixedly connected to the clamping plate 24. Thus, when the pneumatic rod 23 is driven, the connecting rod 21 drives the baffle 22 to move synchronously, and finally realizes the displacement drive of the rotating brush 17. In the initial state, the rotating brush 17 extends out of the connecting pipe 12 (e.g., Figure 8 As shown), at this time, the rotating brush 17 is located inside the boiler to prevent it from affecting the flow of the agent in the connecting pipe 12.

[0058] refer to Figure 2 , Figure 3 A drain pipe 32 is fixedly connected to the lower side of the medicine tank 2 to discharge impurities, residual liquid and wastewater inside the medicine tank 2.

[0059] refer to Figure 1 , 2 An extension frame 104 is fixedly connected to one side of the bracket 1. A control cabinet 16 is fixedly connected to the top of the extension frame 104 via a plate. The control cabinet 16 integrates a dosing system for regulating the dosing device and is connected to a remote terminal via an electrical signal for remote monitoring and regulation of the dosing device.

[0060] Further, refer to Figure 12 The dosing system includes a detection module and a processing module. The detection module includes a viscosity detection unit and a crystallization detection unit. The viscosity detection unit is connected to a viscosity sensor via a signal. Specifically, a sensor mounting base is fixed to the horizontal section of the outlet pipe 5 near the tee pipe 1 via a flange. The viscosity sensor is an insertion-type capacitive viscosity sensor, with the probe extending to half the inner diameter of the outlet pipe 5. It is connected to the mounting base via a threaded seal, and the probe surface is coated with a wear-resistant layer. The connection between the viscosity sensor and the outlet pipe 5 is sealed with a sealing ring. The crystallization detection unit is connected to the ultrasonic transducer 6 via a signal.

[0061] The processing module includes a stirring unit and a rotating unit. The stirring unit is connected to the stirring motor 14, and the rotating unit is connected to the micro motor 18, the electric push rod 20, and the pneumatic rod 23. It should be noted that, according to the reference... Figure 11 Electrically controlled valves are installed on the branch pipes of the drug outlet pipe 5, the first delivery pipe 8, the second delivery pipe 9, and the tee pipe 11 for flow control. All electrically controlled valves are regulated by the drug dosing system.

[0062] The first metering pump 401, the second metering pump 402, the third metering pump 403, and the stirring motor 14 are also connected to the dosing system signal to achieve precise control of the dosing device.

[0063] In this embodiment, the stirring motor 14 is first driven. After the stirring motor 14 starts, it drives the stirring rod 25 to rotate via the coupling, causing the horizontal stirring blade 27 and the vertical stirring blade 28 to rotate synchronously, so that the medicine in the medicine tank 2 is fully mixed and uneven concentration is avoided. At the same time, the first scraper 29 below the horizontal stirring blade 27 rotates with the stirring. Since the distance from the three scrapers to the center is increasing, the medicine residue on the bottom surface of the medicine tank 2 from the center to the edge can be scraped off in sequence. The second scraper 30 on the vertical stirring blade 28 works similarly. The increasing distribution of scrapers can cover different height areas of the inner wall of the medicine tank 2, ensuring that the scraper is in close contact with the tank wall. To reduce adhesion residue, the gas phase balance pipe 15 maintains stable gas pressure inside the medicine tank 2 by connecting to the atmosphere. During the stirring process, the volume of the upper gas phase space inside the medicine tank 2 changes instantaneously due to the rolling of the stirring blades: when the liquid level of the medicine rises and compresses the gas phase space, a slight positive pressure is generated inside the tank, and excess gas can be discharged to the atmosphere through the gas phase balance pipe 15; when the liquid level of the medicine drops and the gas phase space expands, a negative pressure is formed inside the tank, and outside air enters the tank after being filtered by the dust filter at the inlet end of the gas phase balance pipe 15 to replenish it, so as to avoid the negative pressure generated inside the tank during stirring from affecting the dispensing of medicine. The dust filter on the pipeline can prevent external impurities from entering the medicine.

[0064] The agent flows into the tee pipe 1 through the outlet pipe 5, and then enters the first metering pump 401 through the first delivery pipe 8 (the second metering pump 402 and the third metering pump 403 can be started according to the dosage requirements). The metering pump opens and releases the precise output amount of agent according to the preset value of the dosing system. The agent enters the connecting pipe 12 through the second delivery pipe 9, the third delivery pipe 10, and the tee pipe 11, and is finally injected into the boiler. The electric control valves on each pipeline are linked and controlled by the dosing system, and the working status of different chemical tanks 2 or metering pumps can be switched individually to achieve flexible dosing.

[0065] Example 2; Based on the above examples, in this example, in order to prevent the drug from crystallizing in the pipeline, the trigger frequency of the ultrasonic transducer 6 is set to F1 by the crystallization detection unit. When the ultrasonic transducer 6 responds, if the drug in the pipeline is pure and without crystals, the ultrasonic wave propagation path is stable, and the sound velocity and attenuation are fixed only due to the viscosity and temperature of the drug itself.

[0066] If crystal particles are formed inside the tube, and solutes in the drug precipitate and adhere to the tube wall, the crystal particles will scatter, reflect, and absorb the ultrasonic waves, causing the propagation time of the ultrasonic waves to change regularly. At the same time, since the tube wall of the drug outlet tube 5 is part of the vibration system, the crystals attached to the tube wall will change the vibration characteristics of the tube wall, further affecting the feedback characteristics of the ultrasonic signal. These feedback characteristics are received by the crystal detection unit, so the crystallization situation inside the drug outlet tube 5 can be obtained through the signal feedback from the ultrasonic transducer 6.

[0067] Furthermore, when the crystallization detection unit reports that crystals exist in the drug delivery tube 5, the crystallization detection unit will first classify the degree of crystallization into three levels by using the ratio K of the propagation time difference Δt to the standard propagation time difference Δt0 (i.e., K=Δt / Δt0);

[0068] When 1 < K < K1 (K1 is the critical value for mild crystallization, and K1 > 1), the drug outlet tube 5 is in a state of mild crystallization. The crystallization detection unit sends a signal to the processing module to control the ultrasonic transducer 6 to automatically switch to the trigger frequency from F1 to 2F1. The shear force generated by the high-frequency vibration disperses the suspended crystals. At the same time, the high-frequency vibration increases the frequency of micro-deformation of the tube wall, which hinders the further adhesion of crystals. The air compressor 7 starts and intermittently injects slug bubbles. The bubbles rupture under high-frequency vibration to generate local micro-jet, which pushes the tiny crystals to the suction end of the metering pump.

[0069] When K1≤K<K2 (K2 is the critical value for moderate crystallization, and K2>K1), the outlet pipe 5 is in a state of moderate crystallization. The processing module controls the first metering pump 401 (the current working pump) to suspend forward delivery and start reverse operation. At this time, the output flow rate of the metering pump is set to no less than 30% of the forward delivery to ensure that the impact force generated by the reverse flow of the agent is sufficient to peel off the crystals attached to the pipe wall, while avoiding the accumulation of suspended crystals due to excessively low flow rate; the impact force generated by the reverse flow of the agent in the pipeline is used to peel off the crystals attached to the pipe wall into a suspended state; at the same time, the electric control valve of the three-way pipe 11 leading to the boiler is closed, and the bypass return valve is opened ( Figure 1 The bypass return valve (connecting the delivery pipe 310 and the return port of the medicine tank 2) has a diameter not less than that of the main pipeline. When opened, the air compressor 7 is simultaneously started to inject a small amount of plug air bubbles into the delivery pipe 310. The bubbles, along with the reverse flow of the medicine, push the suspended crystals towards the medicine tank 2, preventing the crystals from stagnating in the narrow part of the return pipe. This allows the medicine containing crystals to flow back to the medicine tank 2 for re-stirring, preventing it from entering the boiler. The ultrasonic transducer 6 is started and performs periodic frequency sweeps within the range of F1-2F1. Different frequency ultrasonic waves cause fatigue vibration between the crystals and the pipe wall, accelerating the shedding of the attached crystals. During the frequency sweep, the ultrasonic amplitude is maintained within a set range. Within this range, the vibration effect is ensured while avoiding excessive vibration that could damage the pipeline. At the same time, continuous vibration can prevent suspended crystals from re-attaching to the pipe wall. The rotating brush 17 inside the control connection pipe 12 is moved into the pipe in advance, and the micro motor 18 is pre-rotated at low speed to form an interception barrier to prevent large pieces of crystals from falling off and entering the main passage of the boiler. Throughout the treatment process, the dosing system monitors the pipeline pressure of the dosing pipe 5, the first delivery pipe 8, and the third delivery pipe 10 in real time. If the pressure fluctuation exceeds the range, the reverse running time of the metering pump is immediately extended, and the slug injection frequency of the air compressor 7 is increased to ensure that the pipeline is always unobstructed and to avoid blockage.

[0070] When K2≤K<K3 (K3 is the critical value for severe crystallization, and K3>K2), the discharge pipe 5 is in a state of severe crystallization. The processing module immediately closes the currently operating discharge pipe 5 electric control valve and simultaneously opens the discharge pipe 5 electric control valve of another tank 2, continuing to supply chemicals to the boiler through the backup pipeline. At the same time, the first metering pump 401 is closed and the third metering pump 403 is started to ensure continuous chemical addition.

[0071] For the original drug outlet tube 5, the ultrasonic transducer 6 further increases the trigger frequency to 3F1, and works with the air compressor 7 to continuously inject high-pressure bubbles. The processing module records the parameters of the stirring power and metering pump output of the drug during the current severe crystallization of K2≤K<K3. When the subsequent operating parameters are highly matched with these parameters, the mild crystallization treatment program is started 30 minutes in advance to achieve predictive anti-blocking.

[0072] Through the above operations, targeted measures were taken when K was in different ranges, and the treatment of different crystallization levels in the pipeline was achieved. Furthermore, in order to verify whether the effect of the above operations met the standards, the cleaning effect needs to be tested.

[0073] Specifically, immediately after a single cleaning is completed, the K value is detected again by the ultrasonic transducer 6. If the K value decreases by less than 30% after cleaning, it indicates that the current cleaning effect is not good, and the operation steps will be repeated through the dosing system. At the same time, if the current situation is 1 < K < K1, it is a state of mild crystallization. If the cleaning effect is not good in this state, it indicates that there is a fault in the dosing system. The dosing system will be suspended and feedback will be provided that the current system has a fault and needs to be maintained.

[0074] If the current state is K1≤K<K2, it indicates a moderate crystallization state. Poor cleaning in this state suggests that crystallization has become locally stubborn and is worsening. Instead of shutting down, the system performs intensive cleaning, automatically increasing the rotating brush speed and controlling it to alternate between forward and reverse rotation. Simultaneously, the air compressor 7 is activated intermittently to break down the stubborn crystals through the combined effect of mechanical force and airflow turbulence. The processing module records the results. If the standard is not met after two consecutive intensive cleanings, the dosing system will pause operation and report a system malfunction.

[0075] If the current state is K2≤K<K3, it is a state of heavy crystallization. In this state, the cleaning effect is poor, indicating that the crystals are attached to the key cleaning structure, resulting in poor cleaning effect. In order to determine the specific location of the crystals, the dosing system will inspect the path of the agent in sequence.

[0076] Specifically, since another medicine tank 2 has been selected for supplying medicine at this time, the heavily crystallized cleaning medicine tank 2 is in a stopped state. The electric control valve between the delivery pipe 2 9 and each metering pump is closed, and medicine is introduced into the medicine tank 2 with 1 / 3 of the tank volume. A low-viscosity cleaning solution with strong compatibility with the original medicine is selected to avoid secondary reaction. At this time, the stirring motor 14 at the top of the medicine tank 2 is started, and the stirring rod 25 is controlled to run at a low speed. The current feedback of the stirring motor is used to judge the cleaning structure status inside the tank. If the current is continuously higher than the no-load current by m times, and there is intermittent jamming in the rotation of the stirring rod, it indicates that the crystals are attached to the first scraper 29 of the horizontal stirring blade 27 or the second scraper 30 of the vertical stirring blade 28. At this time, the stirring speed is increased and maintained for 10 seconds. The elastic deformation of the scraper is used to scrape off the attached crystals. At the same time, the drain pipe 32 at the bottom of the medicine tank is opened to observe whether there are block crystals discharged from the drain port to help confirm the crystal location.

[0077] After completing the internal inspection of the medicine tank, turn off the stirring motor 14, open the solenoid valve of the medicine outlet pipe 5 of medicine tank 2, start the air compressor 7 to introduce low-pressure airflow into the medicine outlet pipe 5, and at the same time, the ultrasonic transducer 6 can monitor the sound wave propagation signal in the medicine outlet pipe in real time. If the signal is continuously intermittent, it indicates that crystals are attached to the wall of the medicine outlet pipe or the surface of the ultrasonic transducer probe in that area. At this time, the frequency of the ultrasonic transducer 6 can be increased to 3F1 and maintained for 30 seconds. Then, airflow can be introduced again for detection. If the signal returns to normal, it can be confirmed that crystals are attached to the inner wall of the medicine outlet pipe. If the signal is still abnormal, close the solenoid valve of the medicine outlet pipe, disassemble the connecting flange of the medicine outlet pipe and the tee pipe 1, and directly observe the crystal accumulation in the pipe.

[0078] Next, check the delivery pipe 8, the interface of the first metering pump 401, and the delivery pipe 10 in sequence. Close the solenoid valve of the drug outlet pipe, inject a small amount of cleaning fluid into the delivery pipe 8, and start the first metering pump 401 to deliver only the cleaning fluid. Monitor the pressure change through the metering pump. If the pressure rises sharply, it indicates that crystals are attached to the one-way valve at the metering pump inlet or the inner wall of the delivery pipe 8. If the pressure does not change significantly but the flow rate is lower than the rated value, the metering pump inlet connector needs to be disassembled to check whether there are crystal particles between the valve ball and the valve seat.

[0079] Finally, check the connecting pipe 12 and the rotating brush 17. Use the electric push rod 20 and the pneumatic rod 23 to position the rotating brush 17 inside the connecting pipe 12. Use the micro motor 18 to control the rotation of the rotating brush 17 and close the medicine outlet pipe 5 of the medicine tank 2 to ensure that there is no medicine flowing in the pipeline. Only use the air compressor 7 to introduce a stable flow of air into the connecting pipe 12. At the same time, record the pressure difference ΔP1 between the front and rear ends of the rotating brush 17 (using the pressure sensor on a metering pump that is not in use). Set the standard pressure difference in the connecting pipe 12 as ΔP.

[0080] If ΔP1 < ΔP, this is far below the normal brush bristle condition, indicating that the brush bristles are severely worn or partially broken, and the airflow resistance is insufficient; if ΔP1 > ΔP, this indicates that the connecting pipe 12 is broken, and the rotating brush 17 and the connecting pipe 12 can be maintained or replaced accordingly.

[0081] Meanwhile, the processing module automatically records the crystallization location during this maintenance. If the cleaning effect is not good in the same K value range in the future, the optimal maintenance method can be directly matched.

[0082] Through the above embodiments, the degree of crystallization of the agent in the pipeline is divided into three levels: light, medium and heavy by using the ultrasonic propagation time difference ratio, and targeted differentiated treatment measures are taken. Overall, pipeline blockage is effectively avoided, and the stability of agent delivery and boiler water treatment effect are ensured.

[0083] Example 3: Based on Examples 1 and 2, in order to prevent the decrease in the accuracy of the delivery ratio and the unsatisfactory effect of boiler dosing caused by changes in the viscosity of the agent, the dosing system is further optimized. The dynamic adaptive adjustment of the dosing ratio is achieved by controlling the viscosity sensor and the rotating brush 17.

[0084] Specifically, the actual viscosity value of the agent in the tube is set to be collected in real time by the viscosity sensor and fed back to the viscosity detection unit. The viscosity detection unit presets the standard viscosity range of the agent [η1, η2] (where η1 is the minimum viscosity suitable for the agent to be dispensed and η2 is the maximum viscosity suitable for the agent to be dispensed), and sets η0 (η1 < η0 < η2) as the optimal delivery viscosity of the agent.

[0085] When the viscosity detection unit reports η > η2, it indicates that the viscosity of the agent is too high, which is prone to deposit and block the pipeline and reduces the mixing efficiency with boiler water. At this time, the viscosity detection unit immediately sends a signal to the processing module. The processing module controls the pipeline reserved on the side of the gas phase balance pipe 15 to open and introduce diluent. The amount of diluent replenishment is obtained according to the viscosity deviation value (η-η0). The delivery frequency of the first metering pump 401 and the second metering pump 402 is adjusted simultaneously to make the viscosity of the mixed agent return to the range of [η1, η2]. At the same time, if the crystallization detection unit reports that the K value is 1 < K < K1, the processing module controls the ultrasonic transducer 6 to maintain the vibration of the 2F1 frequency to avoid the viscous agent from adhering to the pipe wall and ensure the stable delivery of the adjusted agent ratio.

[0086] When the viscosity detection unit reports η < η1, it indicates that the agent concentration is too low and the water treatment effect is insufficient. The treatment module closes the pipeline reserved on the side of the gas phase balance pipe 15, increases the frequency of concentrated agent delivery of the first metering pump 401, and controls the stirring motor 14 to increase the speed. The high-speed stirring of the horizontal stirring blade 27 and the vertical stirring blade 28 enhances the uniformity of the agent concentration in the tank 2, ensuring that the effective components of the agent delivered to the boiler meet the standards.

[0087] Furthermore, when the crystallization detection unit reports through the ultrasonic transducer 6 that crystals exist near the boiler port of the connecting pipe 12 (K value satisfies 1 < K < K1), the processing module sends a signal to the rotating unit;

[0088] The electric push rod 20 drives the connecting rod 21 to move the baffle 22 along the through groove, and simultaneously retracts the rotating brush 17 from the boiler to the end of the connecting pipe 12. The micro motor 18 starts, and the bristles of the rotating brush 17 rotate against the inner wall of the end of the connecting pipe 12 to clean. After cleaning, the electric push rod 20 drives the rotating brush 17 to extend into the boiler again to return to the non-cleaning state and avoid affecting the flow of the agent.

[0089] To further improve the dosing effect, the bristles of the rotating brush 17 are made of conductive elastic material. At the same time, a current detection module (integrated into the processing module) is connected in series in the power supply circuit of the micro motor 18. When the rotating brush 17 is inserted into the boiler, the processing module controls the micro motor 18 to rotate continuously at low speed, so that the bristles come into contact with the water and pipe walls inside the boiler.

[0090] Furthermore, when K2≤K<K3, in the case of alternating use of two medicine tanks 2, the residual crystal particles in the used tank may enter the spare tank through the pipeline switching, causing the clean medicine in the spare tank to crystallize prematurely, which may lead to cross-contamination. In this case, the processing module starts control. When the crystallization detection unit of one of the medicine tanks 2 in use reports K≥K1, the processing module first closes the discharge valve on the discharge pipe 5 of that medicine tank 2 and turns on the air compressor 7 on that medicine tank 2. After a period of time, the K value of the pipeline is detected by the ultrasonic transducer 6. After confirming that K<1.05, the drain pipe 32 of that medicine tank 2 is opened and the discharge valve of the other medicine tank 2 is turned on to complete the tank switching. At the same time, a one-way isolation valve is added to the discharge pipe 5 of the other medicine tank 2 to prevent the backflow of residual crystals in the used tank and avoid abnormal viscosity fluctuations caused by cross-contamination of the medicines in the two tanks.

[0091] When the crystallization detection unit reports the presence of crystals near the boiler port of the connecting pipe 12 via the ultrasonic transducer 6, at which point 1 < K < K1, the processing module sends a signal to the rotating unit; the electric push rod 20 drives the connecting rod 21 to move the baffle 22 along the through groove, simultaneously retracting the rotating brush 17 from inside the boiler to the end of the connecting pipe 12, the micro motor 18 starts, and the bristles of the rotating brush 17 rotate against the inner wall of the end of the connecting pipe 12 for cleaning; after cleaning, the electric push rod 20 drives the rotating brush 17 to extend into the boiler again, returning to the non-cleaning state to avoid affecting the flow of the reagent.

[0092] To further improve the dosing effect, the bristles of the rotating brush 17 are made of conductive elastic material. At the same time, a current detection module (integrated into the processing module) is connected in series in the power supply circuit of the micro motor 18. When the rotating brush 17 is inserted into the boiler, the processing module controls the micro motor 18 to rotate continuously at low speed. The bristles contact the water and pipe walls in the boiler. If the scaling trend in the boiler water increases, the contact resistance of the bristles increases, and the operating current of the micro motor 18 increases accordingly. The processing module can adjust the dosage of the metering pump in advance according to the current change trend.

[0093] The above embodiments effectively solve the problem of decreased dosing accuracy caused by changes in reagent viscosity, avoid pipeline blockage, further optimize boiler water treatment effect, and improve the adaptive and precise control capabilities of the dosing system.

[0094] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0095] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An intelligent dosing device for boilers, characterized by, The utility model provides a medicine tank, which comprises a support (1), a plurality of connecting frames (101) fixedly connected to the inside of the support (1), two medicine tanks (2) installed above the support (1), a surrounding frame (103) fixedly connected to the connecting frame (101) and surrounding the medicine tank (2); One side of the medicine tank (2) is fixedly connected with a medicine outlet pipe (5), the outer wall of the medicine outlet pipe (5) is fixedly connected with an ultrasonic transducer (6), one end of the medicine outlet pipe (5) is connected with a three-way pipe I, the three-way pipe I is connected with an air compressor (7) and a conveying pipe I (8), the conveying pipe I (8) is connected with a first metering pump (401); The first metering pump (401) is connected with a conveying pipe II (9), the conveying pipe II (9) is connected with a conveying pipe III (10), the conveying pipe III (10) is connected with a three-way pipe (11), the three-way pipe (11) is connected with a connecting pipe (12); The surrounding frame (103) is fixedly connected with a horizontal plate II (13) at the top, the horizontal plate II (13) is fixedly connected with a stirring motor (14), the output shaft of the stirring motor (14) is connected with a stirring rod (25), the stirring rod (25) is connected with a connecting sleeve ring (26), a horizontal stirring blade (27) and a vertical stirring blade (28), the horizontal stirring blade (27) is connected with a first scraper (29), the vertical stirring blade (28) is connected with a second scraper (30) and a positioning ring (31); One side of the support (1) is connected with an extension frame (104), and a control cabinet (16) is installed above the extension frame (104); The connecting pipe (12) is internally provided with a rotating brush (17) and a cover (19); A rotating shaft is arranged in the middle of the rotating brush (17), a hollow cavity is formed in the middle section of the rotating shaft, the cover (19) is arranged in the connecting pipe (12), and the cover (19) is arranged on the side, close to the rotating shaft, of the rotating brush (17) and connected with the rotating shaft through a sealing bearing; An internal micro motor (18) is arranged on the rotating shaft, the micro motor (18) is arranged in the hollow cavity in the middle section of the rotating shaft, the micro motor (18) is powered by a storage battery, and the storage battery is integrated in the cover (19).

2. The intelligent chemical feeding device for boiler according to claim 1, characterized in that, The connecting frame (101) is fixedly connected with a supporting column (102) at one end and the top, the supporting column (102) is fixedly connected with a horizontal plate I (3) at the top, the horizontal plate I (3) comprises three horizontal plates, the first metering pump (401) is fixedly connected to one of the horizontal plates (3), the second metering pump (402) and the third metering pump (403) are fixedly connected to the other two horizontal plates (3) in a corresponding manner, two medicine tanks (2) are connected in parallel, and the liquid is taken by the three metering pumps in parallel after being converged.

3. The intelligent chemical feeding device for boiler according to claim 2, characterized in that, The distance between the first scraper (29) below the three horizontal stirring blades (27) and the connecting sleeve ring (26) increases in sequence, the distance between the second scraper (30) on the three vertical stirring blades (28) and the positioning ring (31) increases in sequence, and the first scraper (29) and the second scraper (30) cover the areas from the center to the edge of the bottom surface of the medicine tank (2) and from the top to the bottom of the inner wall of the medicine tank (2) respectively.

4. The intelligent chemical feeding device for boiler according to claim 3, characterized in that, The ultrasonic transducer (6) is fixedly connected to the outer wall of the medicine outlet pipe (5) by bolts and a matching flange, ultrasonic waves generated by the ultrasonic transducer (6) first pass through the medicine outlet pipe (5) and then enter the fluid in the pipe, and the pipe wall of the medicine outlet pipe (5) is part of a vibration system.

5. The intelligent chemical feeding device for boiler according to claim 4, characterized in that, The medicine tank (2) is connected with a gas phase balance pipe (15) and a blowdown pipe (32); The air compressor (7) is connected to the pipeline of the three-way pipe one through a gas injection joint, and a one-way valve is installed in the pipeline to prevent the flow of the medicament; An electric control valve is arranged on the pipeline leading to the boiler, and a bypass return valve is further arranged between the third conveying pipe (10) and the medicine tank (2).

6. The intelligent chemical feeding device for boiler according to claim 5, characterized in that, A through groove is formed in the upper portion of the connecting pipe (12), a baffle (22) is slidably connected in the through groove, guide sliding grooves are formed in the groove walls on both sides of the through groove, an elastic pressing strip is fixed on the upper edge of the through groove by bolts, and the bottom of the elastic pressing strip is attached to the upper surface of the baffle (22); A fluorine rubber lip seal strip is embedded in the annular sealing groove of the baffle (22), and a wear-resistant coating is arranged on the side of the lip facing the inside of the connecting pipe (12).

7. The intelligent chemical feeding device for boiler according to claim 6, characterized in that, An electric push rod (20) is installed in the connecting pipe (12), and the movable end of the electric push rod (20) is fixedly connected to the middle portion of the side of the cover (19) away from the rotating brush (17); A connecting rod (21) is fixedly connected to the base of the electric push rod (20), the connecting rod (21) penetrates the baffle (22), a pneumatic rod (23) is fixedly connected to the pipe wall of the connecting pipe (12), a clamping plate (24) is fixedly connected to the movable end of the pneumatic rod (23), and the upper end of the connecting rod (21) is fixedly connected in the clamping plate (24).

8. An intelligent dosing system for a boiler, suitable for use with the intelligent dosing device of claim 7, characterized in that: The dosing system is integrated in the control cabinet (16), the dosing system comprises a detection module and a processing module, the detection module comprises a viscosity detection unit and a crystallization detection unit, and the processing module comprises a stirring unit and a rotating unit; The viscosity detection unit is signal connected with a viscosity sensor, the crystallization detection unit is signal connected with the ultrasonic transducer (6), and the stirring unit is signal connected with the stirring motor (14). The rotating unit is signal connected with the micro motor (18), the electric push rod (20) and the pneumatic rod (23).

9. The intelligent chemical feeding system for boiler as claimed in claim 8 wherein, An electric current detection module integrated in the processing module is connected in series in the power supply circuit of the micro motor (18).

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